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
12 - [You can now match against `PhantomData<T>` types.][55837]
13 - [You can now match against literals in macros with the `literal`
14 specifier.][56072] This will match against a literal of any type.
15 E.g. `1`, `'A'`, `"Hello World"`
16 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
18 struct Point(i32, i32);
21 pub fn new(x: i32, y: i32) -> Self {
25 pub fn is_origin(&self) -> bool {
33 - [Self can also now be used in type definitions.][56366] E.g.
37 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
40 Cons(T, Box<Self>) // likewise here
43 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
44 a `impl Trait` or `dyn Trait` is returned and unused in the program.
48 - [The default allocator has changed from jemalloc to the default allocator on
49 your system.][55238] The compiler itself on Linux & macOS will still use
50 jemalloc, but programs compiled with it will use the system allocator.
51 - [Added the `aarch64-pc-windows-msvc` target.][55702]
55 - [`PathBuf` now implements `FromStr`.][55148]
56 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
57 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
58 easily debug expressions in your rust program. E.g.
61 let b = dbg!(a * 2) + 1;
62 // ^-- prints: [src/main.rs:4] a * 2 = 4
66 The following APIs are now `const` functions and can be used in a
73 - [`ManuallyDrop::new`]
74 - [`ManuallyDrop::into_inner`]
75 - [`RangeInclusive::start`]
76 - [`RangeInclusive::end`]
80 - [`Duration::as_secs`]
81 - [`Duration::subsec_millis`]
82 - [`Duration::subsec_micros`]
83 - [`Duration::subsec_nanos`]
85 - [`Ipv4Addr::is_unspecified`]
87 - [`Ipv6Addr::octets`]
94 - [`i8::from_be_bytes`]
95 - [`i8::from_le_bytes`]
96 - [`i8::from_ne_bytes`]
97 - [`i16::to_be_bytes`]
98 - [`i16::to_le_bytes`]
99 - [`i16::to_ne_bytes`]
100 - [`i16::from_be_bytes`]
101 - [`i16::from_le_bytes`]
102 - [`i16::from_ne_bytes`]
103 - [`i32::to_be_bytes`]
104 - [`i32::to_le_bytes`]
105 - [`i32::to_ne_bytes`]
106 - [`i32::from_be_bytes`]
107 - [`i32::from_le_bytes`]
108 - [`i32::from_ne_bytes`]
109 - [`i64::to_be_bytes`]
110 - [`i64::to_le_bytes`]
111 - [`i64::to_ne_bytes`]
112 - [`i64::from_be_bytes`]
113 - [`i64::from_le_bytes`]
114 - [`i64::from_ne_bytes`]
115 - [`isize::to_be_bytes`]
116 - [`isize::to_le_bytes`]
117 - [`isize::to_ne_bytes`]
118 - [`isize::from_be_bytes`]
119 - [`isize::from_le_bytes`]
120 - [`isize::from_ne_bytes`]
121 - [`u8::to_be_bytes`]
122 - [`u8::to_le_bytes`]
123 - [`u8::to_ne_bytes`]
124 - [`u8::from_be_bytes`]
125 - [`u8::from_le_bytes`]
126 - [`u8::from_ne_bytes`]
127 - [`u16::to_be_bytes`]
128 - [`u16::to_le_bytes`]
129 - [`u16::to_ne_bytes`]
130 - [`u16::from_be_bytes`]
131 - [`u16::from_le_bytes`]
132 - [`u16::from_ne_bytes`]
133 - [`u32::to_be_bytes`]
134 - [`u32::to_le_bytes`]
135 - [`u32::to_ne_bytes`]
136 - [`u32::from_be_bytes`]
137 - [`u32::from_le_bytes`]
138 - [`u32::from_ne_bytes`]
139 - [`u64::to_be_bytes`]
140 - [`u64::to_le_bytes`]
141 - [`u64::to_ne_bytes`]
142 - [`u64::from_be_bytes`]
143 - [`u64::from_le_bytes`]
144 - [`u64::from_ne_bytes`]
145 - [`usize::to_be_bytes`]
146 - [`usize::to_le_bytes`]
147 - [`usize::to_ne_bytes`]
148 - [`usize::from_be_bytes`]
149 - [`usize::from_le_bytes`]
150 - [`usize::from_ne_bytes`]
154 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
155 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
159 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
163 - [The argument types for AVX's
164 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
165 been changed from `*const` to `*mut` as the previous implementation
169 [55148]: https://github.com/rust-lang/rust/pull/55148/
170 [55238]: https://github.com/rust-lang/rust/pull/55238/
171 [55280]: https://github.com/rust-lang/rust/pull/55280/
172 [55610]: https://github.com/rust-lang/rust/pull/55610/
173 [55663]: https://github.com/rust-lang/rust/pull/55663/
174 [55702]: https://github.com/rust-lang/rust/pull/55702/
175 [55837]: https://github.com/rust-lang/rust/pull/55837/
176 [55843]: https://github.com/rust-lang/rust/pull/55843/
177 [56072]: https://github.com/rust-lang/rust/pull/56072/
178 [56245]: https://github.com/rust-lang/rust/pull/56245/
179 [56365]: https://github.com/rust-lang/rust/pull/56365/
180 [56366]: https://github.com/rust-lang/rust/pull/56366/
181 [56395]: https://github.com/rust-lang/rust/pull/56395/
182 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
183 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
184 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
185 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
186 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
187 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
188 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
189 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
190 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
191 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
192 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
193 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
194 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
195 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
196 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
197 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
198 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
199 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
200 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
201 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
202 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
203 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
204 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
205 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
206 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
207 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
208 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
209 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
210 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
211 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
212 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
213 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
214 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
215 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
216 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
217 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
218 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
219 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
220 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
221 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
222 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
223 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
224 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
225 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
226 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
227 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
228 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
229 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
230 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
231 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
232 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
233 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
234 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
235 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
236 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
237 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
238 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
239 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
240 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
241 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
242 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
243 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
244 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
245 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
246 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
247 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
248 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
249 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
250 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
251 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
252 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
253 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
254 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
255 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
256 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
257 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
258 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
259 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
260 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
261 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
262 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
265 Version 1.31.1 (2018-12-20)
266 ===========================
268 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
269 - [Fix broken go-to-definition in RLS][rls/1171]
270 - [Fix infinite loop on hover in RLS][rls/1170]
272 [56562]: https://github.com/rust-lang/rust/pull/56562
273 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
274 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
276 Version 1.31.0 (2018-12-06)
277 ==========================
281 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
282 - [New lifetime elision rules now allow for eliding lifetimes in functions and
283 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
284 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
286 - [You can now define and use `const` functions.][54835] These are currently
287 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
288 [language reference][const-reference] for what exactly is available.
289 - [You can now use tool lints, which allow you to scope lints from external
290 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
291 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
292 a crate, not just in exported functions.][54451]
293 - [You can now use parentheses in pattern matches.][54497]
297 - [Updated musl to 1.1.20][54430]
301 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
302 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
303 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
304 into `Option<&mut T>` using the `From` trait.][53218]
305 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
310 - [`slice::align_to`]
311 - [`slice::align_to_mut`]
312 - [`slice::chunks_exact`]
313 - [`slice::chunks_exact_mut`]
315 - [`slice::rchunks_mut`]
316 - [`slice::rchunks_exact`]
317 - [`slice::rchunks_exact_mut`]
318 - [`Option::replace`]
322 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
323 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
324 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
326 [52813]: https://github.com/rust-lang/rust/pull/52813/
327 [53218]: https://github.com/rust-lang/rust/pull/53218/
328 [53555]: https://github.com/rust-lang/rust/issues/53555/
329 [54057]: https://github.com/rust-lang/rust/pull/54057/
330 [54240]: https://github.com/rust-lang/rust/pull/54240/
331 [54430]: https://github.com/rust-lang/rust/pull/54430/
332 [54451]: https://github.com/rust-lang/rust/pull/54451/
333 [54497]: https://github.com/rust-lang/rust/pull/54497/
334 [54778]: https://github.com/rust-lang/rust/pull/54778/
335 [54835]: https://github.com/rust-lang/rust/pull/54835/
336 [54870]: https://github.com/rust-lang/rust/pull/54870/
337 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
338 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
339 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
340 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
341 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
342 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
343 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
344 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
345 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
346 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
347 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
348 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
349 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
350 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
352 Version 1.30.1 (2018-11-08)
353 ===========================
355 - [Fixed overflow ICE in rustdoc][54199]
356 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
358 [54199]: https://github.com/rust-lang/rust/pull/54199
359 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
361 Version 1.30.0 (2018-10-25)
362 ==========================
366 - [Procedural macros are now available.][52081] These kinds of macros allow for
367 more powerful code generation. There is a [new chapter available][proc-macros]
368 in the Rust Programming Language book that goes further in depth.
369 - [You can now use keywords as identifiers using the raw identifiers
370 syntax (`r#`),][53236] e.g. `let r#for = true;`
371 - [Using anonymous parameters in traits is now deprecated with a warning and
372 will be a hard error in the 2018 edition.][53272]
373 - [You can now use `crate` in paths.][54404] This allows you to refer to the
374 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
375 - [Using a external crate no longer requires being prefixed with `::`.][54404]
376 Previously, using a external crate in a module without a use statement
377 required `let json = ::serde_json::from_str(foo);` but can now be written
378 as `let json = serde_json::from_str(foo);`.
379 - [You can now apply the `#[used]` attribute to static items to prevent the
380 compiler from optimising them away, even if they appear to be unused,][51363]
381 e.g. `#[used] static FOO: u32 = 1;`
382 - [You can now import and reexport macros from other crates with the `use`
383 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
384 the root module of the crate. If your macro relies on calling other local
385 macros, it is recommended to export with the
386 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
388 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
389 using the `vis` specifier.][53370]
390 - [Non-macro attributes now allow all forms of literals, not just
391 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
392 write `#[attr(true)]`.
393 - [You can now specify a function to handle a panic in the Rust runtime with the
394 `#[panic_handler]` attribute.][51366]
398 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
399 - [Added the `aarch64-unknown-netbsd` target][53165]
403 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
407 - [`Ipv4Addr::BROADCAST`]
408 - [`Ipv4Addr::LOCALHOST`]
409 - [`Ipv4Addr::UNSPECIFIED`]
410 - [`Ipv6Addr::LOCALHOST`]
411 - [`Ipv6Addr::UNSPECIFIED`]
412 - [`Iterator::find_map`]
414 The following methods are replacement methods for `trim_left`, `trim_right`,
415 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
417 - [`str::trim_end_matches`]
419 - [`str::trim_start_matches`]
420 - [`str::trim_start`]
424 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
425 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
426 equivalent to calling `rustdoc --error-format=json`.
427 - [Cargo will now provide a progress bar for builds.][cargo/5995]
431 - [`rustdoc` allows you to specify what edition to treat your code as with the
432 `--edition` option.][54057]
433 - [`rustdoc` now has the `--color` (specify whether to output color) and
434 `--error-format` (specify error format, e.g. `json`) options.][53003]
435 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
436 debug symbols.][53774]
437 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
438 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
440 [50911]: https://github.com/rust-lang/rust/pull/50911/
441 [51363]: https://github.com/rust-lang/rust/pull/51363/
442 [51366]: https://github.com/rust-lang/rust/pull/51366/
443 [52081]: https://github.com/rust-lang/rust/pull/52081/
444 [53003]: https://github.com/rust-lang/rust/pull/53003/
445 [53033]: https://github.com/rust-lang/rust/pull/53033/
446 [53044]: https://github.com/rust-lang/rust/pull/53044/
447 [53165]: https://github.com/rust-lang/rust/pull/53165/
448 [53213]: https://github.com/rust-lang/rust/pull/53213/
449 [53236]: https://github.com/rust-lang/rust/pull/53236/
450 [53272]: https://github.com/rust-lang/rust/pull/53272/
451 [53370]: https://github.com/rust-lang/rust/pull/53370/
452 [53459]: https://github.com/rust-lang/rust/pull/53459/
453 [53774]: https://github.com/rust-lang/rust/pull/53774/
454 [53822]: https://github.com/rust-lang/rust/pull/53822/
455 [54057]: https://github.com/rust-lang/rust/pull/54057/
456 [54146]: https://github.com/rust-lang/rust/pull/54146/
457 [54404]: https://github.com/rust-lang/rust/pull/54404/
458 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
459 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
460 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
461 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
463 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
464 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
465 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
466 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
467 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
468 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
469 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
470 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
471 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
472 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
475 Version 1.29.2 (2018-10-11)
476 ===========================
478 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
479 - The `rls-preview` component on the windows-gnu targets has been restored.
481 [54639]: https://github.com/rust-lang/rust/pull/54639
484 Version 1.29.1 (2018-09-25)
485 ===========================
490 - The standard library's `str::repeat` function contained an out of bounds write
491 caused by an integer overflow. This has been fixed by deterministically
492 panicking when an overflow happens.
494 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
498 Version 1.29.0 (2018-09-13)
499 ==========================
503 - [Bumped minimum LLVM version to 5.0.][51899]
504 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
505 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
509 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
510 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
511 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
512 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
514 - [`Cell<T>` now allows `T` to be unsized.][50494]
515 - [`SocketAddr` is now stable on Redox.][52656]
520 - [`Iterator::flatten`]
525 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
526 `--locked` to disable this behavior.
527 - [`cargo-install` will now allow you to cross compile an install
528 using `--target`.][cargo/5614]
529 - [Added the `cargo-fix` subcommand to automatically move project code from
530 2015 edition to 2018.][cargo/5723]
531 - [`cargo doc` can now optionally document private types using the
532 `--document-private-items` flag.][cargo/5543]
536 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
537 the specified level to that level.][52354] For example `--cap-lints warn`
538 will demote `deny` and `forbid` lints to `warn`.
539 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
540 fails and `101` if there is a panic.][52197]
541 - [A preview of clippy has been made available through rustup.][51122]
542 You can install the preview with `rustup component add clippy-preview`.
546 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
547 Use `str::get_unchecked(begin..end)` instead.
548 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
549 Consider using the `home_dir` function from
550 https://crates.io/crates/dirs instead.
551 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
552 - [`cfg` attributes and `--cfg` command line flags are now more
553 strictly validated.][53893]
555 [53893]: https://github.com/rust-lang/rust/pull/53893/
556 [52861]: https://github.com/rust-lang/rust/pull/52861/
557 [52656]: https://github.com/rust-lang/rust/pull/52656/
558 [52239]: https://github.com/rust-lang/rust/pull/52239/
559 [52330]: https://github.com/rust-lang/rust/pull/52330/
560 [52354]: https://github.com/rust-lang/rust/pull/52354/
561 [52402]: https://github.com/rust-lang/rust/pull/52402/
562 [52103]: https://github.com/rust-lang/rust/pull/52103/
563 [52197]: https://github.com/rust-lang/rust/pull/52197/
564 [51807]: https://github.com/rust-lang/rust/pull/51807/
565 [51899]: https://github.com/rust-lang/rust/pull/51899/
566 [51912]: https://github.com/rust-lang/rust/pull/51912/
567 [51511]: https://github.com/rust-lang/rust/pull/51511/
568 [51619]: https://github.com/rust-lang/rust/pull/51619/
569 [51656]: https://github.com/rust-lang/rust/pull/51656/
570 [51178]: https://github.com/rust-lang/rust/pull/51178/
571 [51122]: https://github.com/rust-lang/rust/pull/51122
572 [50494]: https://github.com/rust-lang/rust/pull/50494/
573 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
574 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
575 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
576 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
577 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
578 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
579 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
582 Version 1.28.0 (2018-08-02)
583 ===========================
587 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
588 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
589 the inner type across Foreign Function Interface (FFI) boundaries.
590 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
591 and can now be used as identifiers.][51196]
592 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
593 stable.][51241] This will allow users to specify a global allocator for
595 - [Unit test functions marked with the `#[test]` attribute can now return
596 `Result<(), E: Debug>` in addition to `()`.][51298]
597 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
598 allows macros to easily target lifetimes.
602 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
603 prioritise making smaller binary sizes. `z` is the same as `s` with the
604 exception that it does not vectorise loops, which typically results in an even
606 - [The short error format is now stable.][49546] Specified with
607 `--error-format=short` this option will provide a more compressed output of
609 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
610 - [Reduced the number of allocations in the macro parser.][50855] This can
611 improve compile times of macro heavy crates on average by 5%.
615 - [Implemented `Default` for `&mut str`.][51306]
616 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
617 - [Implemented `Extend` for `()`.][50234]
618 - [The `Debug` implementation of `time::Duration` should now be more easily
619 human readable.][50364] Previously a `Duration` of one second would printed as
620 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
621 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
622 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
623 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
624 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
625 for `PathBuf`.][50170]
626 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
627 and `Wrapping<i128>`.][50465]
628 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
629 possible.][51050] This can provide up to a 40% speed increase.
630 - [Improved error messages when using `format!`.][50610]
634 - [`Iterator::step_by`]
635 - [`Path::ancestors`]
636 - [`SystemTime::UNIX_EPOCH`]
637 - [`alloc::GlobalAlloc`]
639 - [`alloc::LayoutErr`]
642 - [`alloc::alloc_zeroed`]
645 - [`alloc::handle_alloc_error`]
646 - [`btree_map::Entry::or_default`]
648 - [`hash_map::Entry::or_default`]
649 - [`iter::repeat_with`]
650 - [`num::NonZeroUsize`]
651 - [`num::NonZeroU128`]
652 - [`num::NonZeroU16`]
653 - [`num::NonZeroU32`]
654 - [`num::NonZeroU64`]
656 - [`ops::RangeBounds`]
657 - [`slice::SliceIndex`]
658 - [`slice::from_mut`]
659 - [`slice::from_ref`]
660 - [`{Any + Send + Sync}::downcast_mut`]
661 - [`{Any + Send + Sync}::downcast_ref`]
662 - [`{Any + Send + Sync}::is`]
666 - [Cargo will now no longer allow you to publish crates with build scripts that
667 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
668 considered to be immutable.
672 - [The `suggestion_applicability` field in `rustc`'s json output is now
673 stable.][50486] This will allow dev tools to check whether a code suggestion
678 - [Rust will consider trait objects with duplicated constraints to be the same
679 type as without the duplicated constraint.][51276] For example the below code will
685 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
688 impl Trait + Send + Send {
689 fn test(&self) { println!("two"); }
693 [49546]: https://github.com/rust-lang/rust/pull/49546/
694 [50143]: https://github.com/rust-lang/rust/pull/50143/
695 [50170]: https://github.com/rust-lang/rust/pull/50170/
696 [50234]: https://github.com/rust-lang/rust/pull/50234/
697 [50265]: https://github.com/rust-lang/rust/pull/50265/
698 [50364]: https://github.com/rust-lang/rust/pull/50364/
699 [50385]: https://github.com/rust-lang/rust/pull/50385/
700 [50465]: https://github.com/rust-lang/rust/pull/50465/
701 [50486]: https://github.com/rust-lang/rust/pull/50486/
702 [50554]: https://github.com/rust-lang/rust/pull/50554/
703 [50610]: https://github.com/rust-lang/rust/pull/50610/
704 [50855]: https://github.com/rust-lang/rust/pull/50855/
705 [51050]: https://github.com/rust-lang/rust/pull/51050/
706 [51196]: https://github.com/rust-lang/rust/pull/51196/
707 [51200]: https://github.com/rust-lang/rust/pull/51200/
708 [51241]: https://github.com/rust-lang/rust/pull/51241/
709 [51276]: https://github.com/rust-lang/rust/pull/51276/
710 [51298]: https://github.com/rust-lang/rust/pull/51298/
711 [51306]: https://github.com/rust-lang/rust/pull/51306/
712 [51562]: https://github.com/rust-lang/rust/pull/51562/
713 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
714 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
715 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
716 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
717 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
718 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
719 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
720 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
721 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
722 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
723 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
724 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
725 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
726 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
727 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
728 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
729 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
730 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
731 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
732 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
733 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
734 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
735 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
736 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
737 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
738 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
739 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
740 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
741 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
742 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
744 Version 1.27.2 (2018-07-20)
745 ===========================
750 - The borrow checker was fixed to avoid potential unsoundness when using
751 match ergonomics: [#52213][52213].
753 [52213]: https://github.com/rust-lang/rust/issues/52213
755 Version 1.27.1 (2018-07-10)
756 ===========================
761 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
762 when running, which enabled executing code as some other user on a
763 given machine. This release fixes that vulnerability; you can read
764 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
766 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
771 - The borrow checker was fixed to avoid an additional potential unsoundness when using
772 match ergonomics: [#51415][51415], [#49534][49534].
774 [51415]: https://github.com/rust-lang/rust/issues/51415
775 [49534]: https://github.com/rust-lang/rust/issues/49534
776 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
777 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
779 Version 1.27.0 (2018-06-21)
780 ==========================
784 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
785 be used as an identifier.
786 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
787 bare `Trait` syntax, and should make it clearer when being used in tandem with
788 `impl Trait` because it is equivalent to the following syntax:
789 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
790 `Box<Trait> == Box<dyn Trait>`.
791 - [Attributes on generic parameters such as types and lifetimes are
792 now stable.][48851] e.g.
793 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
794 - [The `#[must_use]` attribute can now also be used on functions as well as
795 types.][48925] It provides a lint that by default warns users when the
796 value returned by a function has not been used.
800 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
804 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
805 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
806 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
807 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
809 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
810 std are now available in core.][49896]
811 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
813 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
814 that the operation isn't done in place.
815 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
816 the `#[must_use]` attribute][49533] to warn about unused potentially
817 expensive allocations.
821 - [`DoubleEndedIterator::rfind`]
822 - [`DoubleEndedIterator::rfold`]
823 - [`DoubleEndedIterator::try_rfold`]
824 - [`Duration::from_micros`]
825 - [`Duration::from_nanos`]
826 - [`Duration::subsec_micros`]
827 - [`Duration::subsec_millis`]
828 - [`HashMap::remove_entry`]
829 - [`Iterator::try_fold`]
830 - [`Iterator::try_for_each`]
833 - [`String::replace_range`]
834 - [`Take::set_limit`]
835 - [`hint::unreachable_unchecked`]
836 - [`os::unix::process::parent_id`]
837 - [`ptr::swap_nonoverlapping`]
838 - [`slice::rsplit_mut`]
840 - [`slice::swap_with_slice`]
844 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
845 `readme`, and `repository` fields.][cargo/5386]
846 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
847 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
848 a different directory than `target` for placing compilation artifacts.
849 - [Cargo will be adding automatic target inference for binaries, benchmarks,
850 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
851 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
852 where cargo would infer a binary, Cargo will produce a warning. You can
853 disable this feature ahead of time by setting any of the following to false:
854 `autobins`, `autobenches`, `autoexamples`, `autotests`.
855 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
856 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
860 - [Added “The Rustc book” into the official documentation.][49707]
861 [“The Rustc book”] documents and teaches how to use the rustc compiler.
862 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
866 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
867 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
868 compile, `"".is_empty()` will still compile.
869 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
870 will only print the inner type.][48553] E.g.
871 `print!("{:?}", AtomicBool::new(true))` will print `true`,
872 not `AtomicBool(true)`.
873 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
874 could enter higher numbers but they were not supported by LLVM. Up to 512MB
875 alignment should cover all use cases.
876 - The `.description()` method on the `std::error::Error` trait
877 [has been soft-deprecated][50163]. It is no longer required to implement it.
879 [48553]: https://github.com/rust-lang/rust/pull/48553/
880 [48851]: https://github.com/rust-lang/rust/pull/48851/
881 [48925]: https://github.com/rust-lang/rust/pull/48925/
882 [49533]: https://github.com/rust-lang/rust/pull/49533/
883 [49623]: https://github.com/rust-lang/rust/pull/49623/
884 [49630]: https://github.com/rust-lang/rust/pull/49630/
885 [49664]: https://github.com/rust-lang/rust/pull/49664/
886 [49699]: https://github.com/rust-lang/rust/pull/49699/
887 [49707]: https://github.com/rust-lang/rust/pull/49707/
888 [49719]: https://github.com/rust-lang/rust/pull/49719/
889 [49896]: https://github.com/rust-lang/rust/pull/49896/
890 [49968]: https://github.com/rust-lang/rust/pull/49968/
891 [50163]: https://github.com/rust-lang/rust/pull/50163
892 [50177]: https://github.com/rust-lang/rust/pull/50177/
893 [50378]: https://github.com/rust-lang/rust/pull/50378/
894 [50398]: https://github.com/rust-lang/rust/pull/50398/
895 [50423]: https://github.com/rust-lang/rust/pull/50423/
896 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
897 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
898 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
899 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
900 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
901 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
902 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
903 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
904 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
905 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
906 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
907 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
908 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
909 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
910 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
911 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
912 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
913 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
914 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
915 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
916 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
917 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
918 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
919 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
920 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
921 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
922 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
923 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
924 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
925 [“The Rustc book”]: https://doc.rust-lang.org/rustc
928 Version 1.26.2 (2018-06-05)
929 ==========================
934 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
936 [51117]: https://github.com/rust-lang/rust/issues/51117
939 Version 1.26.1 (2018-05-29)
940 ==========================
945 - [RLS now works on Windows.][50646]
946 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
952 - [`fn main() -> impl Trait` no longer works for non-Termination
954 This reverts an accidental stabilization.
955 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
956 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
958 [50646]: https://github.com/rust-lang/rust/issues/50646
959 [50656]: https://github.com/rust-lang/rust/pull/50656
960 [50812]: https://github.com/rust-lang/rust/pull/50812
961 [50950]: https://github.com/rust-lang/rust/issues/50950
962 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
964 Version 1.26.0 (2018-05-10)
965 ==========================
969 - [Closures now implement `Copy` and/or `Clone` if all captured variables
970 implement either or both traits.][49299]
971 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
972 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
973 lifetime can be elided.][49458]
974 - [`impl Trait` is now stable allowing you to have abstract types in returns
975 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
976 `fn open(path: impl AsRef<Path>)`.
977 - [Pattern matching will now automatically apply dereferences.][49394]
978 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
979 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
980 - [A lot of operations are now available in a const context.][46882] E.g. You
981 can now index into constant arrays, reference and dereference into constants,
982 and use tuple struct constructors.
983 - [Fixed entry slice patterns are now stable.][48516] E.g.
985 let points = [1, 2, 3, 4];
987 [1, 2, 3, 4] => println!("All points were sequential."),
988 _ => println!("Not all points were sequential."),
995 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
996 - [Fixed exponential projection complexity on nested types.][48296]
997 This can provide up to a ~12% reduction in compile times for certain crates.
998 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
999 to remap path prefixes outputted by the compiler.
1000 - [Added `powerpc-unknown-netbsd` target.][48281]
1004 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1005 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1006 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1007 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1008 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1009 - [`ascii::escape_default` is now available in libcore.][48735]
1010 - [Trailing commas are now supported in std and core macros.][48056]
1011 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1012 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1017 - [`*const T::copy_to_nonoverlapping`]
1018 - [`*const T::copy_to`]
1019 - [`*const T::read_unaligned`]
1020 - [`*const T::read_volatile`]
1021 - [`*const T::read`]
1023 - [`*const T::wrapping_add`]
1024 - [`*const T::wrapping_sub`]
1026 - [`*mut T::copy_to_nonoverlapping`]
1027 - [`*mut T::copy_to`]
1028 - [`*mut T::read_unaligned`]
1029 - [`*mut T::read_volatile`]
1031 - [`*mut T::replace`]
1034 - [`*mut T::wrapping_add`]
1035 - [`*mut T::wrapping_sub`]
1036 - [`*mut T::write_bytes`]
1037 - [`*mut T::write_unaligned`]
1038 - [`*mut T::write_volatile`]
1041 - [`FromUtf8Error::as_bytes`]
1042 - [`LocalKey::try_with`]
1043 - [`Option::cloned`]
1044 - [`btree_map::Entry::and_modify`]
1045 - [`fs::read_to_string`]
1048 - [`hash_map::Entry::and_modify`]
1049 - [`iter::FusedIterator`]
1050 - [`ops::RangeInclusive`]
1051 - [`ops::RangeToInclusive`]
1053 - [`slice::rotate_left`]
1054 - [`slice::rotate_right`]
1055 - [`String::retain`]
1060 - [Cargo will now output path to custom commands when `-v` is
1061 passed with `--list`][cargo/5041]
1062 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1066 - [The second edition of "The Rust Programming Language" book is now recommended
1067 over the first.][48404]
1072 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1073 syntax is now invalid.
1075 use std::ops::Fn as dyn;
1076 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1078 - [The result of dereferences are no longer promoted to `'static`.][47408]
1082 const PAIR: &(i32, i32) = &(0, 1);
1083 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1086 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1087 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1089 - [Removed hoedown from rustdoc.][48274]
1090 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1092 [46882]: https://github.com/rust-lang/rust/pull/46882
1093 [47379]: https://github.com/rust-lang/rust/pull/47379
1094 [47408]: https://github.com/rust-lang/rust/pull/47408
1095 [47813]: https://github.com/rust-lang/rust/pull/47813
1096 [48056]: https://github.com/rust-lang/rust/pull/48056
1097 [48125]: https://github.com/rust-lang/rust/pull/48125
1098 [48166]: https://github.com/rust-lang/rust/pull/48166
1099 [48235]: https://github.com/rust-lang/rust/pull/48235
1100 [48274]: https://github.com/rust-lang/rust/pull/48274
1101 [48281]: https://github.com/rust-lang/rust/pull/48281
1102 [48296]: https://github.com/rust-lang/rust/pull/48296
1103 [48326]: https://github.com/rust-lang/rust/pull/48326
1104 [48359]: https://github.com/rust-lang/rust/pull/48359
1105 [48404]: https://github.com/rust-lang/rust/pull/48404
1106 [48481]: https://github.com/rust-lang/rust/pull/48481
1107 [48516]: https://github.com/rust-lang/rust/pull/48516
1108 [48628]: https://github.com/rust-lang/rust/pull/48628
1109 [48629]: https://github.com/rust-lang/rust/pull/48629
1110 [48657]: https://github.com/rust-lang/rust/pull/48657
1111 [48735]: https://github.com/rust-lang/rust/pull/48735
1112 [48978]: https://github.com/rust-lang/rust/pull/48978
1113 [49101]: https://github.com/rust-lang/rust/pull/49101
1114 [49109]: https://github.com/rust-lang/rust/pull/49109
1115 [49121]: https://github.com/rust-lang/rust/pull/49121
1116 [49162]: https://github.com/rust-lang/rust/pull/49162
1117 [49184]: https://github.com/rust-lang/rust/pull/49184
1118 [49234]: https://github.com/rust-lang/rust/pull/49234
1119 [49255]: https://github.com/rust-lang/rust/pull/49255
1120 [49299]: https://github.com/rust-lang/rust/pull/49299
1121 [49305]: https://github.com/rust-lang/rust/pull/49305
1122 [49394]: https://github.com/rust-lang/rust/pull/49394
1123 [49458]: https://github.com/rust-lang/rust/pull/49458
1124 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1125 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1126 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1127 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1128 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1129 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1130 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1131 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1132 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1133 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1134 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1135 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1136 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1137 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1138 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1139 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1140 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1141 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1142 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1143 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1144 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1145 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1146 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1147 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1148 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1149 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1150 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1151 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1152 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1153 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1154 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1155 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1156 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1157 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1158 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1159 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1160 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1161 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1162 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1163 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1164 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1165 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1168 Version 1.25.0 (2018-03-29)
1169 ==========================
1173 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1174 - [You can now use nested groups of imports.][47948]
1175 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1176 - [You can now have `|` at the start of a match arm.][47947] e.g.
1178 enum Foo { A, B, C }
1184 | Foo::B => println!("AB"),
1185 | Foo::C => println!("C"),
1192 - [Upgraded to LLVM 6.][47828]
1193 - [Added `-C lto=val` option.][47521]
1194 - [Added `i586-unknown-linux-musl` target][47282]
1198 - [Impl Send for `process::Command` on Unix.][47760]
1199 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1200 - [`UnsafeCell::into_inner` is now safe.][47204]
1201 - [Implement libstd for CloudABI.][47268]
1202 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1203 - [Implement `AsRef<Path>` for Component][46985]
1204 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1205 - [Moved `Duration` to libcore.][46666]
1209 - [`Location::column`]
1212 The following functions can now be used in a constant expression.
1213 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1214 - [`Duration::new`][47300]
1215 - [`Duration::from_secs`][47300]
1216 - [`Duration::from_millis`][47300]
1220 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1221 - [`cargo new` now defaults to creating a binary crate, instead of a
1222 library crate.][cargo/5029]
1226 - [Rust by example is now shipped with new releases][46196]
1230 - [Deprecated `net::lookup_host`.][47510]
1231 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1232 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1233 around indexing operations (see [#47349][47349]). This has been fixed (which also
1234 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1235 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1237 [33903]: https://github.com/rust-lang/rust/pull/33903
1238 [47947]: https://github.com/rust-lang/rust/pull/47947
1239 [47948]: https://github.com/rust-lang/rust/pull/47948
1240 [47760]: https://github.com/rust-lang/rust/pull/47760
1241 [47790]: https://github.com/rust-lang/rust/pull/47790
1242 [47828]: https://github.com/rust-lang/rust/pull/47828
1243 [47398]: https://github.com/rust-lang/rust/pull/47398
1244 [47510]: https://github.com/rust-lang/rust/pull/47510
1245 [47521]: https://github.com/rust-lang/rust/pull/47521
1246 [47204]: https://github.com/rust-lang/rust/pull/47204
1247 [47251]: https://github.com/rust-lang/rust/pull/47251
1248 [47268]: https://github.com/rust-lang/rust/pull/47268
1249 [47282]: https://github.com/rust-lang/rust/pull/47282
1250 [47300]: https://github.com/rust-lang/rust/pull/47300
1251 [47349]: https://github.com/rust-lang/rust/pull/47349
1252 [46931]: https://github.com/rust-lang/rust/pull/46931
1253 [46985]: https://github.com/rust-lang/rust/pull/46985
1254 [47006]: https://github.com/rust-lang/rust/pull/47006
1255 [46830]: https://github.com/rust-lang/rust/pull/46830
1256 [46095]: https://github.com/rust-lang/rust/pull/46095
1257 [46666]: https://github.com/rust-lang/rust/pull/46666
1258 [46196]: https://github.com/rust-lang/rust/pull/46196
1259 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1260 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1261 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1262 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1263 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1266 Version 1.24.1 (2018-03-01)
1267 ==========================
1269 - [Do not abort when unwinding through FFI][48251]
1270 - [Emit UTF-16 files for linker arguments on Windows][48318]
1271 - [Make the error index generator work again][48308]
1272 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1274 [48251]: https://github.com/rust-lang/rust/issues/48251
1275 [48308]: https://github.com/rust-lang/rust/issues/48308
1276 [48318]: https://github.com/rust-lang/rust/issues/48318
1277 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1280 Version 1.24.0 (2018-02-15)
1281 ==========================
1285 - [External `sysv64` ffi is now available.][46528]
1286 eg. `extern "sysv64" fn foo () {}`
1290 - [rustc now uses 16 codegen units by default for release builds.][46910]
1291 For the fastest builds, utilize `codegen-units=1`.
1292 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1293 - [Add `aarch64-unknown-openbsd` support][46760]
1297 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1298 improvement in performance in the majority of cases.
1299 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1300 with Windows.][46798]
1301 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1302 - [impl `From<bool>` for `AtomicBool`][46293]
1303 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1304 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1305 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1306 - [float::from_bits now just uses transmute.][46012] This provides
1307 some optimisations from LLVM.
1308 - [Copied `AsciiExt` methods onto `char`][46077]
1309 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1310 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1311 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1312 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1316 - [`RefCell::replace`]
1318 - [`atomic::spin_loop_hint`]
1320 The following functions can now be used in a constant expression.
1321 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1323 - [`AtomicBool::new`][46287]
1324 - [`AtomicUsize::new`][46287]
1325 - [`AtomicIsize::new`][46287]
1326 - [`AtomicPtr::new`][46287]
1327 - [`Cell::new`][46287]
1328 - [`{integer}::min_value`][46287]
1329 - [`{integer}::max_value`][46287]
1330 - [`mem::size_of`][46287]
1331 - [`mem::align_of`][46287]
1332 - [`ptr::null`][46287]
1333 - [`ptr::null_mut`][46287]
1334 - [`RefCell::new`][46287]
1335 - [`UnsafeCell::new`][46287]
1339 - [Added a `workspace.default-members` config that
1340 overrides implied `--all` in virtual workspaces.][cargo/4743]
1341 - [Enable incremental by default on development builds.][cargo/4817] Also added
1342 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1343 per-project or global basis respectively.
1350 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1351 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1352 in accordance with IETF RFC 4291 §2.2.
1353 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1354 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1355 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1356 - [Leading zeros in tuple struct members is now an error][47084]
1357 - [`column!()` macro is one-based instead of zero-based][46977]
1358 - [`fmt::Arguments` can no longer be shared across threads][45198]
1359 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1360 - [Cargo sets a different working directory for the compiler][cargo/4788]
1362 [44884]: https://github.com/rust-lang/rust/pull/44884
1363 [45198]: https://github.com/rust-lang/rust/pull/45198
1364 [45506]: https://github.com/rust-lang/rust/pull/45506
1365 [45904]: https://github.com/rust-lang/rust/pull/45904
1366 [45990]: https://github.com/rust-lang/rust/pull/45990
1367 [46012]: https://github.com/rust-lang/rust/pull/46012
1368 [46077]: https://github.com/rust-lang/rust/pull/46077
1369 [46094]: https://github.com/rust-lang/rust/pull/46094
1370 [46284]: https://github.com/rust-lang/rust/pull/46284
1371 [46287]: https://github.com/rust-lang/rust/pull/46287
1372 [46293]: https://github.com/rust-lang/rust/pull/46293
1373 [46528]: https://github.com/rust-lang/rust/pull/46528
1374 [46671]: https://github.com/rust-lang/rust/pull/46671
1375 [46713]: https://github.com/rust-lang/rust/pull/46713
1376 [46735]: https://github.com/rust-lang/rust/pull/46735
1377 [46749]: https://github.com/rust-lang/rust/pull/46749
1378 [46760]: https://github.com/rust-lang/rust/pull/46760
1379 [46798]: https://github.com/rust-lang/rust/pull/46798
1380 [46828]: https://github.com/rust-lang/rust/pull/46828
1381 [46831]: https://github.com/rust-lang/rust/pull/46831
1382 [46833]: https://github.com/rust-lang/rust/pull/46833
1383 [46910]: https://github.com/rust-lang/rust/pull/46910
1384 [46977]: https://github.com/rust-lang/rust/pull/46977
1385 [47018]: https://github.com/rust-lang/rust/pull/47018
1386 [47080]: https://github.com/rust-lang/rust/pull/47080
1387 [47084]: https://github.com/rust-lang/rust/pull/47084
1388 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1389 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1390 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1391 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1392 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1393 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1396 Version 1.23.0 (2018-01-04)
1397 ==========================
1401 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1402 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1403 Which should fix some confusing errors in some operations.
1407 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1408 undefined behavior.][45920]
1409 - [rustc now suggests renaming import if names clash.][45660]
1410 - [Display errors/warnings correctly when there are zero-width or
1411 wide characters.][45711]
1412 - [rustc now avoids unnecessary copies of arguments that are
1413 simple bindings][45380] This should improve memory usage on average by 5-10%.
1414 - [Updated musl used to build musl rustc to 1.1.17][45393]
1418 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1419 - [Implement Hash for raw pointers to unsized types][45483]
1420 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1421 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1422 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1423 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1424 and `<*mut T>::as_mut`][44932]
1425 - [Optimized `Thread::{park, unpark}` implementation][45524]
1426 - [Improved `SliceExt::binary_search` performance.][45333]
1427 - [impl `FromIterator<()>` for `()`][45379]
1428 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1436 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1437 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1438 - [Added unit test checking to `cargo check`][cargo/4592]
1439 - [Cargo now lets you install a specific version
1440 using `cargo install --version`][cargo/4637]
1444 - [Releases now ship with the Cargo book documentation.][45692]
1445 - [rustdoc now prints rendering warnings on every run.][45324]
1449 - [Changes have been made to type equality to make it more correct,
1450 in rare cases this could break some code.][45853] [Tracking issue for
1451 further information][45852]
1452 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1453 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1454 Android 9, the minimum supported version is Android 14.
1455 - [Bumped the minimum LLVM to 3.9][45326]
1457 [44042]: https://github.com/rust-lang/rust/pull/44042
1458 [44932]: https://github.com/rust-lang/rust/pull/44932
1459 [45267]: https://github.com/rust-lang/rust/pull/45267
1460 [45324]: https://github.com/rust-lang/rust/pull/45324
1461 [45326]: https://github.com/rust-lang/rust/pull/45326
1462 [45333]: https://github.com/rust-lang/rust/pull/45333
1463 [45379]: https://github.com/rust-lang/rust/pull/45379
1464 [45380]: https://github.com/rust-lang/rust/pull/45380
1465 [45393]: https://github.com/rust-lang/rust/pull/45393
1466 [45435]: https://github.com/rust-lang/rust/pull/45435
1467 [45483]: https://github.com/rust-lang/rust/pull/45483
1468 [45524]: https://github.com/rust-lang/rust/pull/45524
1469 [45571]: https://github.com/rust-lang/rust/pull/45571
1470 [45580]: https://github.com/rust-lang/rust/pull/45580
1471 [45610]: https://github.com/rust-lang/rust/pull/45610
1472 [45660]: https://github.com/rust-lang/rust/pull/45660
1473 [45692]: https://github.com/rust-lang/rust/pull/45692
1474 [45711]: https://github.com/rust-lang/rust/pull/45711
1475 [45772]: https://github.com/rust-lang/rust/pull/45772
1476 [45852]: https://github.com/rust-lang/rust/issues/45852
1477 [45853]: https://github.com/rust-lang/rust/pull/45853
1478 [45887]: https://github.com/rust-lang/rust/pull/45887
1479 [45920]: https://github.com/rust-lang/rust/pull/45920
1480 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1481 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1482 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1485 Version 1.22.1 (2017-11-22)
1486 ==========================
1488 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1490 [46183]: https://github.com/rust-lang/rust/pull/46183
1492 Version 1.22.0 (2017-11-22)
1493 ==========================
1497 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1498 - [Now accepts underscores in unicode escapes][43716]
1499 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1500 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1504 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1505 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1506 This should decrease compile times for debug builds.
1507 - [strict memory alignment now enabled on ARMv6][45094]
1508 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1512 - [Allow atomic operations up to 32 bits
1513 on `armv5te_unknown_linux_gnueabi`][44978]
1514 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1515 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1516 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1517 - [Properly detect overflow in `Instant += Duration`.][44220]
1518 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1519 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1520 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1527 - [Cargo will now build multi file examples in subdirectories of the `examples`
1528 folder that have a `main.rs` file.][cargo/4496]
1529 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1530 the old format will continue to work and can be updated with `cargo update`.
1531 - [Now supports vendoring git repositories][cargo/3992]
1535 - [`libbacktrace` is now available on Apple platforms.][44251]
1536 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1537 This now lets you specify that a given code example will fail to compile.
1541 - [The minimum Android version that rustc can build for has been bumped
1542 to `4.0` from `2.3`][45656]
1543 - [Allowing `T op= &T` for numeric types has broken some type
1544 inference cases][45480]
1547 [42526]: https://github.com/rust-lang/rust/pull/42526
1548 [43017]: https://github.com/rust-lang/rust/pull/43017
1549 [43716]: https://github.com/rust-lang/rust/pull/43716
1550 [43949]: https://github.com/rust-lang/rust/pull/43949
1551 [44015]: https://github.com/rust-lang/rust/pull/44015
1552 [44220]: https://github.com/rust-lang/rust/pull/44220
1553 [44251]: https://github.com/rust-lang/rust/pull/44251
1554 [44287]: https://github.com/rust-lang/rust/pull/44287
1555 [44303]: https://github.com/rust-lang/rust/pull/44303
1556 [44456]: https://github.com/rust-lang/rust/pull/44456
1557 [44466]: https://github.com/rust-lang/rust/pull/44466
1558 [44895]: https://github.com/rust-lang/rust/pull/44895
1559 [44966]: https://github.com/rust-lang/rust/pull/44966
1560 [44978]: https://github.com/rust-lang/rust/pull/44978
1561 [45041]: https://github.com/rust-lang/rust/pull/45041
1562 [45064]: https://github.com/rust-lang/rust/pull/45064
1563 [45075]: https://github.com/rust-lang/rust/pull/45075
1564 [45094]: https://github.com/rust-lang/rust/pull/45094
1565 [45095]: https://github.com/rust-lang/rust/pull/45095
1566 [45480]: https://github.com/rust-lang/rust/issues/45480
1567 [45656]: https://github.com/rust-lang/rust/pull/45656
1568 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1569 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1570 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1577 Version 1.21.0 (2017-10-12)
1578 ==========================
1582 - [You can now use static references for literals.][43838]
1586 let x: &'static u32 = &0;
1589 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1592 my_macro!(Vec<i32>::new); // Always worked
1593 my_macro!(Vec::<i32>::new); // Now works
1598 - [Upgraded jemalloc to 4.5.0][43911]
1599 - [Enabled unwinding panics on Redox][43917]
1600 - [Now runs LLVM in parallel during translation phase.][43506]
1601 This should reduce peak memory usage.
1605 - [Generate builtin impls for `Clone` for all arrays and tuples that
1606 are `T: Clone`][43690]
1607 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1608 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1609 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1614 [`std::mem::discriminant`]
1618 - [You can now call `cargo install` with multiple package names][cargo/4216]
1619 - [Cargo commands inside a virtual workspace will now implicitly
1620 pass `--all`][cargo/4335]
1621 - [Added a `[patch]` section to `Cargo.toml` to handle
1622 prepublication dependencies][cargo/4123] [RFC 1969]
1623 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1624 like patterns][cargo/4270]
1625 - [Added the `--all-targets` option][cargo/4400]
1626 - [Using required dependencies as a feature is now deprecated and emits
1627 a warning][cargo/4364]
1632 - [Cargo docs are moving][43916]
1633 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1634 - [The rustdoc book is now available][43863]
1635 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1636 - [Added a preview of RLS has been made available through rustup][44204]
1637 Install with `rustup component add rls-preview`
1638 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1639 Previously only showed `std::os::unix`.
1643 - [Changes in method matching against higher-ranked types][43880] This may cause
1644 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1645 - [rustc's JSON error output's byte position start at top of file.][42973]
1646 Was previously relative to the rustc's internal `CodeMap` struct which
1647 required the unstable library `libsyntax` to correctly use.
1648 - [`unused_results` lint no longer ignores booleans][43728]
1650 [42565]: https://github.com/rust-lang/rust/pull/42565
1651 [42973]: https://github.com/rust-lang/rust/pull/42973
1652 [43348]: https://github.com/rust-lang/rust/pull/43348
1653 [43459]: https://github.com/rust-lang/rust/pull/43459
1654 [43506]: https://github.com/rust-lang/rust/pull/43506
1655 [43540]: https://github.com/rust-lang/rust/pull/43540
1656 [43690]: https://github.com/rust-lang/rust/pull/43690
1657 [43728]: https://github.com/rust-lang/rust/pull/43728
1658 [43838]: https://github.com/rust-lang/rust/pull/43838
1659 [43863]: https://github.com/rust-lang/rust/pull/43863
1660 [43880]: https://github.com/rust-lang/rust/pull/43880
1661 [43911]: https://github.com/rust-lang/rust/pull/43911
1662 [43916]: https://github.com/rust-lang/rust/pull/43916
1663 [43917]: https://github.com/rust-lang/rust/pull/43917
1664 [44204]: https://github.com/rust-lang/rust/pull/44204
1665 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1666 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1667 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1668 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1669 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1670 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1671 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1672 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1673 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1675 Version 1.20.0 (2017-08-31)
1676 ===========================
1680 - [Associated constants are now stabilised.][42809]
1681 - [A lot of macro bugs are now fixed.][42913]
1686 - [Struct fields are now properly coerced to the expected field type.][42807]
1687 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1688 `wasm32-experimental-emscripten` target.
1689 - [Changed some of the error messages to be more helpful.][42033]
1690 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1692 - [rustc now reports the total number of errors on compilation failure][43015]
1693 previously this was only the number of errors in the pass that failed.
1694 - [Expansion in rustc has been sped up 29x.][42533]
1695 - [added `msp430-none-elf` target.][43099]
1696 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1698 - [Fixes backtraces on Redox][43228]
1699 - [rustc now identifies different versions of same crate when absolute paths of
1700 different types match in an error message.][42826]
1706 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1707 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1709 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1710 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1711 - [Impl `Clone` for `DefaultHasher`.][42799]
1712 - [Impl `Sync` for `SyncSender`.][42397]
1713 - [Impl `FromStr` for `char`][42271]
1714 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1716 - [allow messages in the `unimplemented!()` macro.][42155]
1717 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1718 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1719 - [Upgrade to Unicode 10.0.0][42999]
1720 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1721 - [Skip the main thread's manual stack guard on Linux][43072]
1722 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1723 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1725 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1730 - [`CStr::into_c_string`]
1731 - [`CString::as_c_str`]
1732 - [`CString::into_boxed_c_str`]
1733 - [`Chain::get_mut`]
1734 - [`Chain::get_ref`]
1735 - [`Chain::into_inner`]
1736 - [`Option::get_or_insert_with`]
1737 - [`Option::get_or_insert`]
1738 - [`OsStr::into_os_string`]
1739 - [`OsString::into_boxed_os_str`]
1742 - [`Utf8Error::error_len`]
1743 - [`char::EscapeDebug`]
1744 - [`char::escape_debug`]
1745 - [`compile_error!`]
1746 - [`f32::from_bits`]
1748 - [`f64::from_bits`]
1750 - [`mem::ManuallyDrop`]
1751 - [`slice::sort_unstable_by_key`]
1752 - [`slice::sort_unstable_by`]
1753 - [`slice::sort_unstable`]
1754 - [`str::from_boxed_utf8_unchecked`]
1755 - [`str::as_bytes_mut`]
1756 - [`str::as_bytes_mut`]
1757 - [`str::from_utf8_mut`]
1758 - [`str::from_utf8_unchecked_mut`]
1760 - [`str::get_unchecked_mut`]
1761 - [`str::get_unchecked`]
1763 - [`str::into_boxed_bytes`]
1768 - [Cargo API token location moved from `~/.cargo/config` to
1769 `~/.cargo/credentials`.][cargo/3978]
1770 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1771 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1772 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1773 - [You can now specify version of a binary when installed through
1774 `cargo install` using `--vers`.][cargo/4229]
1775 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1776 failure.][cargo/4248]
1777 - [Changed the convention around which file is the crate root.][cargo/4259]
1778 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1779 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1784 - [Functions with `'static` in their return types will now not be as usable as
1785 if they were using lifetime parameters instead.][42417]
1786 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1787 takes the sign of NaN into account where previously didn't.][42430]
1789 [42033]: https://github.com/rust-lang/rust/pull/42033
1790 [42155]: https://github.com/rust-lang/rust/pull/42155
1791 [42271]: https://github.com/rust-lang/rust/pull/42271
1792 [42397]: https://github.com/rust-lang/rust/pull/42397
1793 [42417]: https://github.com/rust-lang/rust/pull/42417
1794 [42430]: https://github.com/rust-lang/rust/pull/42430
1795 [42431]: https://github.com/rust-lang/rust/pull/42431
1796 [42533]: https://github.com/rust-lang/rust/pull/42533
1797 [42571]: https://github.com/rust-lang/rust/pull/42571
1798 [42613]: https://github.com/rust-lang/rust/pull/42613
1799 [42799]: https://github.com/rust-lang/rust/pull/42799
1800 [42807]: https://github.com/rust-lang/rust/pull/42807
1801 [42809]: https://github.com/rust-lang/rust/pull/42809
1802 [42822]: https://github.com/rust-lang/rust/pull/42822
1803 [42826]: https://github.com/rust-lang/rust/pull/42826
1804 [42854]: https://github.com/rust-lang/rust/pull/42854
1805 [42913]: https://github.com/rust-lang/rust/pull/42913
1806 [42999]: https://github.com/rust-lang/rust/pull/42999
1807 [43011]: https://github.com/rust-lang/rust/pull/43011
1808 [43015]: https://github.com/rust-lang/rust/pull/43015
1809 [43072]: https://github.com/rust-lang/rust/pull/43072
1810 [43077]: https://github.com/rust-lang/rust/pull/43077
1811 [43097]: https://github.com/rust-lang/rust/pull/43097
1812 [43099]: https://github.com/rust-lang/rust/pull/43099
1813 [43170]: https://github.com/rust-lang/rust/pull/43170
1814 [43178]: https://github.com/rust-lang/rust/pull/43178
1815 [43185]: https://github.com/rust-lang/rust/pull/43185
1816 [43228]: https://github.com/rust-lang/rust/pull/43228
1817 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1818 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1819 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1820 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1821 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1822 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1823 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1824 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1825 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1826 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1827 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1828 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1829 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1830 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1831 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1832 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1833 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1834 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1835 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1836 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1837 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1838 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1839 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1840 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1841 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1842 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1843 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1844 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1845 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1846 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1847 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1848 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1849 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1850 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1851 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1852 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1853 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1854 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1855 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1858 Version 1.19.0 (2017-07-20)
1859 ===========================
1864 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1865 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1866 - [Macro recursion limit increased to 1024 from 64.][41676]
1867 - [Added lint for detecting unused macros.][41907]
1868 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1869 For example: `let x = loop { break 7; };`
1870 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1871 contain `Copy` types and cannot have a `Drop` implementation.
1872 Example: `union Foo { bar: u8, baz: usize }`
1873 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1874 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1879 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1880 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1881 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1882 you should use `--target armv7-linux-androideabi`.
1883 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1884 - [Minor optimisation of string operations.][42037]
1885 - [Compiler error message is now `aborting due to previous error(s)` instead of
1886 `aborting due to N previous errors`][42150] This was previously inaccurate and
1887 would only count certain kinds of errors.
1888 - [The compiler now supports Visual Studio 2017][42225]
1889 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1890 - [Added a lot][42264] of [new error codes][42302]
1891 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1892 libraries with C Run-time Libraries(CRT) to be statically linked.
1893 - [Fixed various ARM codegen bugs][42740]
1898 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1899 `Extend<Cow<'a, str>>`][41449]
1900 - [`Vec` now implements `From<&mut [T]>`][41530]
1901 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1902 - [`SplitWhitespace` now implements `Clone`][41659]
1903 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1905 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1906 macros, but for printing to stderr.
1911 - [`OsString::shrink_to_fit`]
1914 - [`thread::ThreadId`]
1919 - [Build scripts can now add environment variables to the environment
1920 the crate is being compiled in.
1921 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1922 - [Subcommands now replace the current process rather than spawning a new
1923 child process][cargo/3970]
1924 - [Workspace members can now accept glob file patterns][cargo/3979]
1925 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1926 the members in a given workspace.][cargo/3988]
1927 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1928 - [Target directory path is now in the cargo metadata][cargo/4022]
1929 - [Cargo no longer checks out a local working directory for the
1930 crates.io index][cargo/4026] This should provide smaller file size for the
1931 registry, and improve cloning times, especially on Windows machines.
1932 - [Added an `--exclude` option for excluding certain packages when using the
1933 `--all` option][cargo/4031]
1934 - [Cargo will now automatically retry when receiving a 5xx error
1935 from crates.io][cargo/4032]
1936 - [The `--features` option now accepts multiple comma or space
1937 delimited values.][cargo/4084]
1938 - [Added support for custom target specific runners][cargo/3954]
1943 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1945 - [Rust will now release XZ compressed packages][rust-installer/57]
1946 - [rustup will now prefer to download rust packages with
1947 XZ compression][rustup/1100] over GZip packages.
1948 - [Added the ability to escape `#` in rust documentation][41785] By adding
1949 additional `#`'s ie. `##` is now `#`
1954 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1955 - [`-Z` flags are now no longer allowed to be used on the stable
1956 compiler.][41751] This has been a warning for a year previous to this.
1957 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1958 longer works][42844]. Users should migrate to the built-in `check`
1959 command, which has been available since 1.16.
1960 - [Ending a float literal with `._` is now a hard error.
1961 Example: `42._` .][41946]
1962 - [Any use of a private `extern crate` outside of its module is now a
1963 hard error.][36886] This was previously a warning.
1964 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1965 relative while the `::` prefix makes a path absolute, but was ignored and the
1966 path was relative regardless.
1967 - [Floating point constants in match patterns is now a hard error][36890]
1968 This was previously a warning.
1969 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1970 match patterns is now a hard error][36891] This was previously a warning.
1971 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1973 - [From the pound escape, lines consisting of multiple `#`s are
1975 - [It is an error to re-export private enum variants][42460]. This is
1976 known to break a number of crates that depend on an older version of
1978 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1979 to use it to find the linker, and the build will fail where it did
1980 not previously][42607]
1982 [36886]: https://github.com/rust-lang/rust/issues/36886
1983 [36888]: https://github.com/rust-lang/rust/issues/36888
1984 [36890]: https://github.com/rust-lang/rust/issues/36890
1985 [36891]: https://github.com/rust-lang/rust/issues/36891
1986 [36892]: https://github.com/rust-lang/rust/issues/36892
1987 [37406]: https://github.com/rust-lang/rust/issues/37406
1988 [39983]: https://github.com/rust-lang/rust/pull/39983
1989 [41145]: https://github.com/rust-lang/rust/pull/41145
1990 [41192]: https://github.com/rust-lang/rust/pull/41192
1991 [41258]: https://github.com/rust-lang/rust/pull/41258
1992 [41370]: https://github.com/rust-lang/rust/pull/41370
1993 [41449]: https://github.com/rust-lang/rust/pull/41449
1994 [41530]: https://github.com/rust-lang/rust/pull/41530
1995 [41624]: https://github.com/rust-lang/rust/pull/41624
1996 [41656]: https://github.com/rust-lang/rust/pull/41656
1997 [41659]: https://github.com/rust-lang/rust/pull/41659
1998 [41676]: https://github.com/rust-lang/rust/pull/41676
1999 [41751]: https://github.com/rust-lang/rust/pull/41751
2000 [41764]: https://github.com/rust-lang/rust/pull/41764
2001 [41785]: https://github.com/rust-lang/rust/pull/41785
2002 [41873]: https://github.com/rust-lang/rust/pull/41873
2003 [41907]: https://github.com/rust-lang/rust/pull/41907
2004 [41946]: https://github.com/rust-lang/rust/pull/41946
2005 [42016]: https://github.com/rust-lang/rust/pull/42016
2006 [42037]: https://github.com/rust-lang/rust/pull/42037
2007 [42068]: https://github.com/rust-lang/rust/pull/42068
2008 [42150]: https://github.com/rust-lang/rust/pull/42150
2009 [42162]: https://github.com/rust-lang/rust/pull/42162
2010 [42225]: https://github.com/rust-lang/rust/pull/42225
2011 [42264]: https://github.com/rust-lang/rust/pull/42264
2012 [42302]: https://github.com/rust-lang/rust/pull/42302
2013 [42460]: https://github.com/rust-lang/rust/issues/42460
2014 [42607]: https://github.com/rust-lang/rust/issues/42607
2015 [42740]: https://github.com/rust-lang/rust/pull/42740
2016 [42844]: https://github.com/rust-lang/rust/issues/42844
2017 [42948]: https://github.com/rust-lang/rust/pull/42948
2018 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2019 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2020 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2021 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2022 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2023 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2024 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2025 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2026 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2027 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2028 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2029 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2030 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2031 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2032 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2033 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2034 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2035 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2036 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2037 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2038 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2039 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2042 Version 1.18.0 (2017-06-08)
2043 ===========================
2048 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2049 make the item visible to just that module tree. Also accepts the keyword
2050 `crate` to make something public to the whole crate but not users of the
2051 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2052 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2053 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2054 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2055 types like `Write + Send`, trailing `+` are now supported in trait objects,
2056 and better error reporting for trait objects starting with `?Sized`.
2057 - [0e+10 is now a valid floating point literal][40589]
2058 - [Now warns if you bind a lifetime parameter to 'static][40734]
2059 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2060 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2061 representation in some cases.][40377]
2066 - [rustc can now emit mir with `--emit mir`][39891]
2067 - [Improved LLVM IR for trivial functions][40367]
2068 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2069 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2070 opportunities found through profiling
2071 - [Improved backtrace formatting when panicking][38165]
2076 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2077 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2078 iteration or reallocation.
2079 - [Simplified HashMap Bucket interface][40561] provides performance
2080 improvements for iterating and cloning.
2081 - [Specialize Vec::from_elem to use calloc][40409]
2082 - [Fixed Race condition in fs::create_dir_all][39799]
2083 - [No longer caching stdio on Windows][40516]
2084 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2085 2.50%~ faster and in one case now 12.50% faster.
2086 - [Optimized `AtomicBool::fetch_nand`][41143]
2091 - [`Child::try_wait`]
2092 - [`HashMap::retain`]
2093 - [`HashSet::retain`]
2095 - [`TcpStream::peek`]
2096 - [`UdpSocket::peek`]
2097 - [`UdpSocket::peek_from`]
2102 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2103 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2104 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2105 - [Added Android build support][cargo/3885]
2106 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2107 of a certain type, for example `cargo build --bins` will build all
2109 - [Added support for haiku][cargo/3952]
2114 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2115 - [Added rust-windbg script for better debugging on Windows][39983]
2116 - [Rust now uses the official cross compiler for NetBSD][40612]
2117 - [rustdoc now accepts `#` at the start of files][40828]
2118 - [Fixed jemalloc support for musl][41168]
2123 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2124 always placed after the sign if it exists and before the digits. With the `#`
2125 flag the zeroes are placed after the prefix and before the digits.
2126 - [Due to the struct field optimisation][40377], using `transmute` on structs
2127 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2128 always been undefined behavior, but is now more likely to break in practice.
2129 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2130 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2131 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2132 - [Overlapping inherent `impl`s are now a hard error][40728]
2133 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2134 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2135 `out.asm` and `out.ll` instead of only one of the filetypes.
2136 - [ calling a function that returns `Self` will no longer work][41805] when
2137 the size of `Self` cannot be statically determined.
2138 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2139 this has caused a few regressions namely:
2141 - Changed the link order of local static/dynamic libraries (respecting the
2142 order on given rather than having the compiler reorder).
2143 - Changed how MinGW is linked, native code linked to dynamic libraries
2144 may require manually linking to the gcc support library (for the native
2147 [38165]: https://github.com/rust-lang/rust/pull/38165
2148 [39799]: https://github.com/rust-lang/rust/pull/39799
2149 [39891]: https://github.com/rust-lang/rust/pull/39891
2150 [39983]: https://github.com/rust-lang/rust/pull/39983
2151 [40043]: https://github.com/rust-lang/rust/pull/40043
2152 [40241]: https://github.com/rust-lang/rust/pull/40241
2153 [40338]: https://github.com/rust-lang/rust/pull/40338
2154 [40367]: https://github.com/rust-lang/rust/pull/40367
2155 [40377]: https://github.com/rust-lang/rust/pull/40377
2156 [40409]: https://github.com/rust-lang/rust/pull/40409
2157 [40516]: https://github.com/rust-lang/rust/pull/40516
2158 [40556]: https://github.com/rust-lang/rust/pull/40556
2159 [40561]: https://github.com/rust-lang/rust/pull/40561
2160 [40589]: https://github.com/rust-lang/rust/pull/40589
2161 [40612]: https://github.com/rust-lang/rust/pull/40612
2162 [40723]: https://github.com/rust-lang/rust/pull/40723
2163 [40728]: https://github.com/rust-lang/rust/pull/40728
2164 [40731]: https://github.com/rust-lang/rust/pull/40731
2165 [40734]: https://github.com/rust-lang/rust/pull/40734
2166 [40805]: https://github.com/rust-lang/rust/pull/40805
2167 [40807]: https://github.com/rust-lang/rust/pull/40807
2168 [40828]: https://github.com/rust-lang/rust/pull/40828
2169 [40870]: https://github.com/rust-lang/rust/pull/40870
2170 [41085]: https://github.com/rust-lang/rust/pull/41085
2171 [41143]: https://github.com/rust-lang/rust/pull/41143
2172 [41168]: https://github.com/rust-lang/rust/pull/41168
2173 [41270]: https://github.com/rust-lang/rust/issues/41270
2174 [41469]: https://github.com/rust-lang/rust/pull/41469
2175 [41805]: https://github.com/rust-lang/rust/issues/41805
2176 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2177 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2178 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2179 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2180 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2181 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2182 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2183 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2184 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2185 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2186 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2187 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2188 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2189 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2192 Version 1.17.0 (2017-04-27)
2193 ===========================
2198 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2199 * [Fields of structs may be initialized without duplicating the field/variable
2200 names][39761]. [RFC 1682]
2201 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2202 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2203 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2204 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2205 `'b`. Soundness fix.
2206 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2207 * [Static variables may contain references to other statics][40027]
2212 * [Exit quickly on only `--emit dep-info`][40336]
2213 * [Make `-C relocation-model` more correctly determine whether the linker
2214 creates a position-independent executable][40245]
2215 * [Add `-C overflow-checks` to directly control whether integer overflow
2217 * [The rustc type checker now checks items on demand instead of in a single
2218 in-order pass][40008]. This is mostly an internal refactoring in support of
2219 future work, including incremental type checking, but also resolves [RFC
2220 1647], allowing `Self` to appear in `impl` `where` clauses.
2221 * [Optimize vtable loads][39995]
2222 * [Turn off vectorization for Emscripten targets][39990]
2223 * [Provide suggestions for unknown macros imported with `use`][39953]
2224 * [Fix ICEs in path resolution][39939]
2225 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2226 * [Add clearer error message using `&str + &str`][39116]
2237 * [`Ordering::then`]
2238 * [`Ordering::then_with`]
2239 * [`BTreeMap::range`]
2240 * [`BTreeMap::range_mut`]
2241 * [`collections::Bound`]
2242 * [`process::abort`]
2243 * [`ptr::read_unaligned`]
2244 * [`ptr::write_unaligned`]
2245 * [`Result::expect_err`]
2248 * [`Cell::into_inner`]
2254 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2255 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2256 * [`String` implements `FromIterator<&char>`][40028]
2257 * `Box` [implements][40009] a number of new conversions:
2258 `From<Box<str>> for String`,
2259 `From<Box<[T]>> for Vec<T>`,
2260 `From<Box<CStr>> for CString`,
2261 `From<Box<OsStr>> for OsString`,
2262 `From<Box<Path>> for PathBuf`,
2263 `Into<Box<str>> for String`,
2264 `Into<Box<[T]>> for Vec<T>`,
2265 `Into<Box<CStr>> for CString`,
2266 `Into<Box<OsStr>> for OsString`,
2267 `Into<Box<Path>> for PathBuf`,
2268 `Default for Box<str>`,
2269 `Default for Box<CStr>`,
2270 `Default for Box<OsStr>`,
2271 `From<&CStr> for Box<CStr>`,
2272 `From<&OsStr> for Box<OsStr>`,
2273 `From<&Path> for Box<Path>`
2274 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2275 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2276 * [Slightly optimize `slice::sort`][39538]
2277 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2278 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2279 `Box<str>` implements `From<&str>`][39438]
2280 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2281 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2282 * [`format!` estimates the needed capacity before writing a string][39356]
2283 * [Support unprivileged symlink creation in Windows][38921]
2284 * [`PathBuf` implements `Default`][38764]
2285 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2286 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2287 and poor hash functions.
2292 * [Add `cargo check --all`][cargo/3731]
2293 * [Add an option to ignore SSL revocation checking][cargo/3699]
2294 * [Add `cargo run --package`][cargo/3691]
2295 * [Add `required_features`][cargo/3667]
2296 * [Assume `build.rs` is a build script][cargo/3664]
2297 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2302 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2304 * [The "Unstable Book" documents nightly-only features][ubook]
2305 * [Improve the style of the sidebar in rustdoc output][40265]
2306 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2307 * [Fix MSP430 breakage due to `i128`][40257]
2308 * [Preliminary Solaris/SPARCv9 support][39903]
2309 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2310 run without installing the MSVC runtime.
2311 * [`rustdoc --test` includes file names in test names][39788]
2312 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2313 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2314 * [Initial support for `aarch64-unknown-freebsd`][39491]
2315 * [Initial support for `i686-unknown-netbsd`][39426]
2316 * [This release no longer includes the old makefile build system][39431]. Rust
2317 is built with a custom build system, written in Rust, and with Cargo.
2318 * [Add Debug implementations for libcollection structs][39002]
2319 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2320 * [`--test-threads=0` produces an error][38945]
2321 * [`rustup` installs documentation by default][40526]
2322 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2323 WinDbg and Visual Studio to improve the debugging experience.
2328 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2329 workaround, either use MSVC 2015 or run vcvars.bat.
2330 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2331 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2332 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2334 * [`format!` and `Display::to_string` panic if an underlying formatting
2335 implementation returns an error][40117]. Previously the error was silently
2336 ignored. It is incorrect for `write_fmt` to return an error when writing
2338 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2339 crates were marked stable and could be accessed from the stable toolchain.
2340 * [Rust git source no longer includes vendored crates][39728]. Those that need
2341 to build with vendored crates should build from release tarballs.
2342 * [Fix inert attributes from `proc_macro_derives`][39572]
2343 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2344 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2346 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2347 existing code generally ignores the type of dead-code unless a type-hint is
2348 provided; this can cause surprising inference interactions particularly around
2349 defaulting. The new code uniformly ignores the result type of dead-code.
2350 * [Tuple-struct constructors with private fields are no longer visible][38932]
2351 * [Lifetime parameters that do not appear in the arguments are now considered
2352 early-bound][38897], resolving a soundness bug (#[32330]). The
2353 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2355 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2356 * [Make transmuting from fn item types to pointer-sized types a hard
2359 [27787]: https://github.com/rust-lang/rust/issues/27787
2360 [32330]: https://github.com/rust-lang/rust/issues/32330
2361 [34198]: https://github.com/rust-lang/rust/pull/34198
2362 [38161]: https://github.com/rust-lang/rust/pull/38161
2363 [38368]: https://github.com/rust-lang/rust/pull/38368
2364 [38584]: https://github.com/rust-lang/rust/issues/38584
2365 [38661]: https://github.com/rust-lang/rust/pull/38661
2366 [38764]: https://github.com/rust-lang/rust/pull/38764
2367 [38864]: https://github.com/rust-lang/rust/issues/38864
2368 [38897]: https://github.com/rust-lang/rust/pull/38897
2369 [38921]: https://github.com/rust-lang/rust/pull/38921
2370 [38932]: https://github.com/rust-lang/rust/pull/38932
2371 [38945]: https://github.com/rust-lang/rust/pull/38945
2372 [38981]: https://github.com/rust-lang/rust/pull/38981
2373 [39002]: https://github.com/rust-lang/rust/pull/39002
2374 [39116]: https://github.com/rust-lang/rust/pull/39116
2375 [39193]: https://github.com/rust-lang/rust/pull/39193
2376 [39265]: https://github.com/rust-lang/rust/pull/39265
2377 [39356]: https://github.com/rust-lang/rust/pull/39356
2378 [39372]: https://github.com/rust-lang/rust/pull/39372
2379 [39426]: https://github.com/rust-lang/rust/pull/39426
2380 [39431]: https://github.com/rust-lang/rust/pull/39431
2381 [39438]: https://github.com/rust-lang/rust/pull/39438
2382 [39440]: https://github.com/rust-lang/rust/pull/39440
2383 [39485]: https://github.com/rust-lang/rust/pull/39485
2384 [39491]: https://github.com/rust-lang/rust/pull/39491
2385 [39518]: https://github.com/rust-lang/rust/pull/39518
2386 [39538]: https://github.com/rust-lang/rust/pull/39538
2387 [39572]: https://github.com/rust-lang/rust/pull/39572
2388 [39633]: https://github.com/rust-lang/rust/pull/39633
2389 [39642]: https://github.com/rust-lang/rust/pull/39642
2390 [39728]: https://github.com/rust-lang/rust/pull/39728
2391 [39761]: https://github.com/rust-lang/rust/pull/39761
2392 [39788]: https://github.com/rust-lang/rust/pull/39788
2393 [39793]: https://github.com/rust-lang/rust/pull/39793
2394 [39837]: https://github.com/rust-lang/rust/pull/39837
2395 [39843]: https://github.com/rust-lang/rust/pull/39843
2396 [39851]: https://github.com/rust-lang/rust/pull/39851
2397 [39903]: https://github.com/rust-lang/rust/pull/39903
2398 [39939]: https://github.com/rust-lang/rust/pull/39939
2399 [39953]: https://github.com/rust-lang/rust/pull/39953
2400 [39960]: https://github.com/rust-lang/rust/pull/39960
2401 [39990]: https://github.com/rust-lang/rust/pull/39990
2402 [39995]: https://github.com/rust-lang/rust/pull/39995
2403 [40008]: https://github.com/rust-lang/rust/pull/40008
2404 [40009]: https://github.com/rust-lang/rust/pull/40009
2405 [40027]: https://github.com/rust-lang/rust/pull/40027
2406 [40028]: https://github.com/rust-lang/rust/pull/40028
2407 [40037]: https://github.com/rust-lang/rust/pull/40037
2408 [40117]: https://github.com/rust-lang/rust/pull/40117
2409 [40166]: https://github.com/rust-lang/rust/pull/40166
2410 [40245]: https://github.com/rust-lang/rust/pull/40245
2411 [40257]: https://github.com/rust-lang/rust/pull/40257
2412 [40261]: https://github.com/rust-lang/rust/pull/40261
2413 [40265]: https://github.com/rust-lang/rust/pull/40265
2414 [40319]: https://github.com/rust-lang/rust/pull/40319
2415 [40336]: https://github.com/rust-lang/rust/pull/40336
2416 [40526]: https://github.com/rust-lang/rust/pull/40526
2417 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2418 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2419 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2420 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2421 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2422 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2423 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2424 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2425 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2426 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2427 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2428 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2429 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2430 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2431 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2432 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2433 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2434 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2435 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2436 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2437 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2438 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2439 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2440 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2441 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2442 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2443 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2444 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2445 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2446 [mdbook]: https://crates.io/crates/mdbook
2447 [ubook]: https://doc.rust-lang.org/unstable-book/
2450 Version 1.16.0 (2017-03-16)
2451 ===========================
2456 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2457 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2458 match patterns][38069]
2459 * [Clean up semantics of `self` in an import list][38313]
2460 * [`Self` may appear in `impl` headers][38920]
2461 * [`Self` may appear in struct expressions][39282]
2466 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2467 a `.rmeta` file containing only crate metadata][38571]. This can be
2468 used by tools like the Rust Language Service to perform
2469 metadata-only builds.
2470 * [Levenshtein based typo suggestions now work in most places, while
2471 previously they worked only for fields and sometimes for local
2472 variables][38927]. Together with the overhaul of "no
2473 resolution"/"unexpected resolution" errors (#[38154]) they result in
2474 large and systematic improvement in resolution diagnostics.
2475 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2477 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2478 * [`rustc` no longer attempts to provide "consider using an explicit
2479 lifetime" suggestions][37057]. They were inaccurate.
2484 * [`VecDeque::truncate`]
2485 * [`VecDeque::resize`]
2486 * [`String::insert_str`]
2487 * [`Duration::checked_add`]
2488 * [`Duration::checked_sub`]
2489 * [`Duration::checked_div`]
2490 * [`Duration::checked_mul`]
2493 * [`SocketAddr::is_ipv4`]
2494 * [`SocketAddr::is_ipv6`]
2495 * [`IpAddr::is_ipv4`]
2496 * [`IpAddr::is_ipv6`]
2498 * [`Vec::dedup_by_key`]
2499 * [`Result::unwrap_or_default`]
2500 * [`<*const T>::wrapping_offset`]
2501 * [`<*mut T>::wrapping_offset`]
2502 * `CommandExt::creation_flags`
2503 * [`File::set_permissions`]
2504 * [`String::split_off`]
2509 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2510 their argument by `Borrow` parameter][37761]
2511 * [All public types in std implement `Debug`][38006]
2512 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2513 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2514 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2516 * [std: Fix partial writes in `LineWriter`][38062]
2517 * [std: Clamp max read/write sizes on Unix][38062]
2518 * [Use more specific panic message for `&str` slicing errors][38066]
2519 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2520 functionality cannot be achieved in std currently.
2521 * [`writeln!`, like `println!`, now accepts a form with no string
2522 or formatting arguments, to just print a newline][38469]
2523 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2524 * [Reduce the size of static data in `std_unicode::tables`][38781]
2525 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2526 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2528 * [`Duration` implements `Sum`][38712]
2529 * [`String` implements `ToSocketAddrs`][39048]
2534 * [The `cargo check` command does a type check of a project without
2535 building it][cargo/3296]
2536 * [crates.io will display CI badges from Travis and AppVeyor, if
2537 specified in Cargo.toml][cargo/3546]
2538 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2539 * [Compilation profiles accept integer values for `debug`, in addition
2540 to `true` and `false`. These are passed to `rustc` as the value to
2541 `-C debuginfo`][cargo/3534]
2542 * [Implement `cargo --version --verbose`][cargo/3604]
2543 * [All builds now output 'dep-info' build dependencies compatible with
2544 make and ninja][cargo/3557]
2545 * [Build all workspace members with `build --all`][cargo/3511]
2546 * [Document all workspace members with `doc --all`][cargo/3515]
2547 * [Path deps outside workspace are not members][cargo/3443]
2552 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2553 the path to the Rust implementation][38589]
2554 * [The `armv7-linux-androideabi` target no longer enables NEON
2555 extensions, per Google's ABI guide][38413]
2556 * [The stock standard library can be compiled for Redox OS][38401]
2557 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2559 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2561 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2566 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2567 match patterns][38069]
2568 * In this release, references to uninhabited types can not be
2569 pattern-matched. This was accidentally allowed in 1.15.
2570 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2571 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2573 * [Clean up semantics of `self` in an import list][38313]
2574 * Reimplemented lifetime elision. This change was almost entirely compatible
2575 with existing code, but it did close a number of small bugs and loopholes,
2576 as well as being more accepting in some other [cases][41105].
2578 [37057]: https://github.com/rust-lang/rust/pull/37057
2579 [37761]: https://github.com/rust-lang/rust/pull/37761
2580 [38006]: https://github.com/rust-lang/rust/pull/38006
2581 [38051]: https://github.com/rust-lang/rust/pull/38051
2582 [38062]: https://github.com/rust-lang/rust/pull/38062
2583 [38062]: https://github.com/rust-lang/rust/pull/38622
2584 [38066]: https://github.com/rust-lang/rust/pull/38066
2585 [38069]: https://github.com/rust-lang/rust/pull/38069
2586 [38131]: https://github.com/rust-lang/rust/pull/38131
2587 [38154]: https://github.com/rust-lang/rust/pull/38154
2588 [38274]: https://github.com/rust-lang/rust/pull/38274
2589 [38304]: https://github.com/rust-lang/rust/pull/38304
2590 [38313]: https://github.com/rust-lang/rust/pull/38313
2591 [38314]: https://github.com/rust-lang/rust/pull/38314
2592 [38327]: https://github.com/rust-lang/rust/pull/38327
2593 [38401]: https://github.com/rust-lang/rust/pull/38401
2594 [38413]: https://github.com/rust-lang/rust/pull/38413
2595 [38469]: https://github.com/rust-lang/rust/pull/38469
2596 [38559]: https://github.com/rust-lang/rust/pull/38559
2597 [38571]: https://github.com/rust-lang/rust/pull/38571
2598 [38580]: https://github.com/rust-lang/rust/pull/38580
2599 [38589]: https://github.com/rust-lang/rust/pull/38589
2600 [38670]: https://github.com/rust-lang/rust/pull/38670
2601 [38712]: https://github.com/rust-lang/rust/pull/38712
2602 [38726]: https://github.com/rust-lang/rust/pull/38726
2603 [38781]: https://github.com/rust-lang/rust/pull/38781
2604 [38798]: https://github.com/rust-lang/rust/pull/38798
2605 [38909]: https://github.com/rust-lang/rust/pull/38909
2606 [38920]: https://github.com/rust-lang/rust/pull/38920
2607 [38927]: https://github.com/rust-lang/rust/pull/38927
2608 [39048]: https://github.com/rust-lang/rust/pull/39048
2609 [39282]: https://github.com/rust-lang/rust/pull/39282
2610 [39379]: https://github.com/rust-lang/rust/pull/39379
2611 [41105]: https://github.com/rust-lang/rust/issues/41105
2612 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2613 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2614 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2615 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2616 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2617 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2618 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2619 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2620 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2621 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2622 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2623 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2624 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2625 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2626 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2627 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2628 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2629 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2630 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2631 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2632 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2633 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2634 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2635 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2636 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2637 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2638 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2639 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2640 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2641 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2644 Version 1.15.1 (2017-02-09)
2645 ===========================
2647 * [Fix IntoIter::as_mut_slice's signature][39466]
2648 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2650 [39466]: https://github.com/rust-lang/rust/pull/39466
2651 [39523]: https://github.com/rust-lang/rust/pull/39523
2654 Version 1.15.0 (2017-02-02)
2655 ===========================
2660 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2661 stable. This allows popular code-generating crates like Serde and Diesel to
2662 work ergonomically. [RFC 1681].
2663 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2664 with curly braces][36868]. Part of [RFC 1506].
2665 * [A number of minor changes to name resolution have been activated][37127].
2666 They add up to more consistent semantics, allowing for future evolution of
2667 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2668 details of what is different. The breaking changes here have been transitioned
2669 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2670 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2672 * [`?Sized` can be used in `where` clauses][37791]
2673 * [There is now a limit on the size of monomorphized types and it can be
2674 modified with the `#![type_size_limit]` crate attribute, similarly to
2675 the `#![recursion_limit]` attribute][37789]
2680 * [On Windows, the compiler will apply dllimport attributes when linking to
2681 extern functions][37973]. Additional attributes and flags can control which
2682 library kind is linked and its name. [RFC 1717].
2683 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2684 * [The `--test` flag works with procedural macro crates][38107]
2685 * [Fix `extern "aapcs" fn` ABI][37814]
2686 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2687 * [The `format!` expander recognizes incorrect `printf` and shell-style
2688 formatting directives and suggests the correct format][37613].
2689 * [Only report one error for all unused imports in an import list][37456]
2691 Compiler Performance
2692 --------------------
2694 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2695 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2696 * [Don't clone in `UnificationTable::probe`][37848]
2697 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2698 * [Use small vectors in type walker][37760]
2699 * [Macro expansion performance was improved][37701]
2700 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2701 * [Replace FNV with a faster hash function][37229]
2706 * [`std::iter::Iterator::min_by`]
2707 * [`std::iter::Iterator::max_by`]
2708 * [`std::os::*::fs::FileExt`]
2709 * [`std::sync::atomic::Atomic*::get_mut`]
2710 * [`std::sync::atomic::Atomic*::into_inner`]
2711 * [`std::vec::IntoIter::as_slice`]
2712 * [`std::vec::IntoIter::as_mut_slice`]
2713 * [`std::sync::mpsc::Receiver::try_iter`]
2714 * [`std::os::unix::process::CommandExt::before_exec`]
2715 * [`std::rc::Rc::strong_count`]
2716 * [`std::rc::Rc::weak_count`]
2717 * [`std::sync::Arc::strong_count`]
2718 * [`std::sync::Arc::weak_count`]
2719 * [`std::char::encode_utf8`]
2720 * [`std::char::encode_utf16`]
2721 * [`std::cell::Ref::clone`]
2722 * [`std::io::Take::into_inner`]
2727 * [The standard sorting algorithm has been rewritten for dramatic performance
2728 improvements][38192]. It is a hybrid merge sort, drawing influences from
2729 Timsort. Previously it was a naive merge sort.
2730 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2731 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2733 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2734 and `char_indices().last()`][37882]
2735 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2736 * [Chinese characters display correctly in `fmt::Debug`][37855]
2737 * [Derive `Default` for `Duration`][37699]
2738 * [Support creation of anonymous pipes on WinXP/2k][37677]
2739 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2740 * [Don't pass overlapped handles to processes][38835]
2745 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2746 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2747 should instead check the variable at runtime with `std::env`. That the value
2748 was set at build time was a bug, and incorrect when cross-compiling. This
2749 change is known to cause breakage.
2750 * [Add `--all` flag to `cargo test`][cargo/3221]
2751 * [Compile statically against the MSVC CRT][cargo/3363]
2752 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2753 * [Link OpenSSL statically on OSX][cargo/3311]
2754 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2755 * [Test for bad path overrides with summaries][cargo/3336]
2756 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2757 * [Fix retrying crate downloads for network errors][cargo/3348]
2758 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2759 * [Emit more info on --message-format=json][cargo/3319]
2760 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2761 * [Don't ignore errors in workspace manifest][cargo/3409]
2762 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2767 * [Test runners (binaries built with `--test`) now support a `--list` argument
2768 that lists the tests it contains][38185]
2769 * [Test runners now support a `--exact` argument that makes the test filter
2770 match exactly, instead of matching only a substring of the test name][38181]
2771 * [rustdoc supports a `--playground-url` flag][37763]
2772 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2777 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2778 continue to be used in this release by passing `--disable-rustbuild` to the
2779 configure script, but they will be deleted soon. Note that the new build
2780 system uses a different on-disk layout that will likely affect any scripts
2782 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2784 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2785 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2791 * [A number of minor changes to name resolution have been activated][37127].
2792 They add up to more consistent semantics, allowing for future evolution of
2793 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2794 details of what is different. The breaking changes here have been transitioned
2795 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2796 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2797 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2798 should instead check the variable at runtime with `std::env`. That the value
2799 was set at build time was a bug, and incorrect when cross-compiling. This
2800 change is known to cause breakage.
2801 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2802 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2803 1.10 and is now an error by default. It will become a hard error in the near
2805 * [The semantics relating modules to file system directories are changing in
2806 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2807 lint, which is a warning in this release, and will become a hard error in the
2809 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2810 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2811 the underlying iterator][37834]
2813 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2814 [33685]: https://github.com/rust-lang/rust/issues/33685
2815 [36868]: https://github.com/rust-lang/rust/pull/36868
2816 [37127]: https://github.com/rust-lang/rust/pull/37127
2817 [37229]: https://github.com/rust-lang/rust/pull/37229
2818 [37456]: https://github.com/rust-lang/rust/pull/37456
2819 [37527]: https://github.com/rust-lang/rust/pull/37527
2820 [37602]: https://github.com/rust-lang/rust/pull/37602
2821 [37613]: https://github.com/rust-lang/rust/pull/37613
2822 [37615]: https://github.com/rust-lang/rust/pull/37615
2823 [37636]: https://github.com/rust-lang/rust/pull/37636
2824 [37627]: https://github.com/rust-lang/rust/pull/37627
2825 [37642]: https://github.com/rust-lang/rust/pull/37642
2826 [37677]: https://github.com/rust-lang/rust/pull/37677
2827 [37699]: https://github.com/rust-lang/rust/pull/37699
2828 [37701]: https://github.com/rust-lang/rust/pull/37701
2829 [37705]: https://github.com/rust-lang/rust/pull/37705
2830 [37749]: https://github.com/rust-lang/rust/pull/37749
2831 [37760]: https://github.com/rust-lang/rust/pull/37760
2832 [37763]: https://github.com/rust-lang/rust/pull/37763
2833 [37764]: https://github.com/rust-lang/rust/pull/37764
2834 [37789]: https://github.com/rust-lang/rust/pull/37789
2835 [37791]: https://github.com/rust-lang/rust/pull/37791
2836 [37814]: https://github.com/rust-lang/rust/pull/37814
2837 [37817]: https://github.com/rust-lang/rust/pull/37817
2838 [37834]: https://github.com/rust-lang/rust/pull/37834
2839 [37848]: https://github.com/rust-lang/rust/pull/37848
2840 [37855]: https://github.com/rust-lang/rust/pull/37855
2841 [37882]: https://github.com/rust-lang/rust/pull/37882
2842 [37888]: https://github.com/rust-lang/rust/pull/37888
2843 [37973]: https://github.com/rust-lang/rust/pull/37973
2844 [37979]: https://github.com/rust-lang/rust/pull/37979
2845 [38086]: https://github.com/rust-lang/rust/pull/38086
2846 [38107]: https://github.com/rust-lang/rust/pull/38107
2847 [38117]: https://github.com/rust-lang/rust/pull/38117
2848 [38134]: https://github.com/rust-lang/rust/pull/38134
2849 [38146]: https://github.com/rust-lang/rust/pull/38146
2850 [38181]: https://github.com/rust-lang/rust/pull/38181
2851 [38182]: https://github.com/rust-lang/rust/pull/38182
2852 [38185]: https://github.com/rust-lang/rust/pull/38185
2853 [38192]: https://github.com/rust-lang/rust/pull/38192
2854 [38279]: https://github.com/rust-lang/rust/pull/38279
2855 [38835]: https://github.com/rust-lang/rust/pull/38835
2856 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2857 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2858 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2859 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2860 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2861 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2862 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2863 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2864 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2865 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2866 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2867 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2868 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2869 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2870 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2871 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2872 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2873 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2874 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2875 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2876 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2877 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2878 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2879 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2880 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2881 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2882 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2883 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2884 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2885 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2886 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2887 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2888 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2889 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2890 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2891 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2892 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2893 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2896 Version 1.14.0 (2016-12-22)
2897 ===========================
2902 * [`..` matches multiple tuple fields in enum variants, structs
2903 and tuples][36843]. [RFC 1492].
2904 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2905 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2906 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2907 dereferencing][36822]
2912 * [Mark enums with non-zero discriminant as non-zero][37224]
2913 * [Lower-case `static mut` names are linted like other
2914 statics and consts][37162]
2915 * [Fix ICE on some macros in const integer positions
2916 (e.g. `[u8; m!()]`)][36819]
2917 * [Improve error message and snippet for "did you mean `x`"][36798]
2918 * [Add a panic-strategy field to the target specification][36794]
2919 * [Include LLVM version in `--version --verbose`][37200]
2921 Compile-time Optimizations
2922 --------------------------
2924 * [Improve macro expansion performance][37569]
2925 * [Shrink `Expr_::ExprInlineAsm`][37445]
2926 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2927 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2928 * [Avoid more allocations when compiling html5ever][37373]
2929 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2930 * [Avoid some allocations in the macro parser][37318]
2931 * [Use a faster deflate setting][37298]
2932 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2933 during interning of slices][37270]
2934 * [Optimize `write_metadata`][37267]
2935 * [Don't process obligation forest cycles when stalled][37231]
2936 * [Avoid many `CrateConfig` clones][37161]
2937 * [Optimize `Substs::super_fold_with`][37108]
2938 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2939 * [Speed up `plug_leaks`][36917]
2944 * [`println!()`, with no arguments, prints newline][36825].
2945 Previously, an empty string was required to achieve the same.
2946 * [`Wrapping` impls standard binary and unary operators, as well as
2947 the `Sum` and `Product` iterators][37356]
2948 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2950 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2951 `VecDeque` iterators][37315]
2952 * [Improve `SipHasher` performance on small values][37312]
2953 * [Add Iterator trait TrustedLen to enable better FromIterator /
2955 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2956 * [`ReadDir` implements `Debug`][37221]
2957 * [Implement `RefUnwindSafe` for atomic types][37178]
2958 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2959 * [Avoid allocations in `Decoder::read_str`][37064]
2960 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2961 * [Impl `Debug` for raw pointers to unsized data][36880]
2962 * [Don't reuse `HashMap` random seeds][37470]
2963 * [The internal memory layout of `HashMap` is more cache-friendly, for
2964 significant improvements in some operations][36692]
2965 * [`HashMap` uses less memory on 32-bit architectures][36595]
2966 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2971 * [Expose rustc cfg values to build scripts][cargo/3243]
2972 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2973 * [Fix passing --features when testing multiple packages][cargo/3280]
2974 * [Use a single profile set per workspace][cargo/3249]
2975 * [Load `replace` sections from lock files][cargo/3220]
2976 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2981 * [rustup is the recommended Rust installation method][1.14rustup]
2982 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2983 S390x. These are [tier 2] platforms and may have major defects. Follow the
2984 instructions on the website to install, or add the targets to an existing
2985 installation with `rustup target add`. The new target triples are:
2986 - `mips-unknown-linux-gnu`
2987 - `mipsel-unknown-linux-gnu`
2988 - `mips64-unknown-linux-gnuabi64`
2989 - `mips64el-unknown-linux-gnuabi64 `
2990 - `powerpc-unknown-linux-gnu`
2991 - `powerpc64-unknown-linux-gnu`
2992 - `powerpc64le-unknown-linux-gnu`
2993 - `s390x-unknown-linux-gnu `
2994 * This release includes target (std) builds for ARM Linux running MUSL
2995 libc. These are [tier 2] platforms and may have major defects. Add the
2996 following triples to an existing rustup installation with `rustup target add`:
2997 - `arm-unknown-linux-musleabi`
2998 - `arm-unknown-linux-musleabihf`
2999 - `armv7-unknown-linux-musleabihf`
3000 * This release includes [experimental support for WebAssembly][1.14wasm], via
3001 the `wasm32-unknown-emscripten` target. This target is known to have major
3002 defects. Please test, report, and fix.
3003 * rustup no longer installs documentation by default. Run `rustup
3004 component add rust-docs` to install.
3005 * [Fix line stepping in debugger][37310]
3006 * [Enable line number debuginfo in releases][37280]
3011 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3012 * [Add support for Fuchsia OS][37313]
3013 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3018 * [A number of forward-compatibility lints used by the compiler
3019 to gradually introduce language changes have been converted
3020 to deny by default][36894]:
3021 - ["use of inaccessible extern crate erroneously allowed"][36886]
3022 - ["type parameter default erroneously allowed in invalid location"][36887]
3023 - ["detects super or self keywords at the beginning of global path"][36888]
3024 - ["two overlapping inherent impls define an item with the same name
3025 were erroneously allowed"][36889]
3026 - ["floating-point constants cannot be used in patterns"][36890]
3027 - ["constants of struct or enum type can only be used in a pattern if
3028 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3029 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3030 * [Prohibit patterns in trait methods without bodies][37378]
3031 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3032 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3033 * [The `$crate` macro variable is accepted in fewer locations][37213]
3034 * [Impls specifying extra region requirements beyond the trait
3035 they implement are rejected][37167]
3036 * [Enums may not be unsized][37111]. Unsized enums are intended to
3037 work but never have. For now they are forbidden.
3038 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3040 [tier 2]: https://forge.rust-lang.org/platform-support.html
3041 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3042 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3043 [36430]: https://github.com/rust-lang/rust/pull/36430
3044 [36595]: https://github.com/rust-lang/rust/pull/36595
3045 [36595]: https://github.com/rust-lang/rust/pull/36595
3046 [36692]: https://github.com/rust-lang/rust/pull/36692
3047 [36767]: https://github.com/rust-lang/rust/pull/36767
3048 [36794]: https://github.com/rust-lang/rust/pull/36794
3049 [36798]: https://github.com/rust-lang/rust/pull/36798
3050 [36819]: https://github.com/rust-lang/rust/pull/36819
3051 [36822]: https://github.com/rust-lang/rust/pull/36822
3052 [36825]: https://github.com/rust-lang/rust/pull/36825
3053 [36843]: https://github.com/rust-lang/rust/pull/36843
3054 [36880]: https://github.com/rust-lang/rust/pull/36880
3055 [36886]: https://github.com/rust-lang/rust/issues/36886
3056 [36887]: https://github.com/rust-lang/rust/issues/36887
3057 [36888]: https://github.com/rust-lang/rust/issues/36888
3058 [36889]: https://github.com/rust-lang/rust/issues/36889
3059 [36890]: https://github.com/rust-lang/rust/issues/36890
3060 [36891]: https://github.com/rust-lang/rust/issues/36891
3061 [36892]: https://github.com/rust-lang/rust/issues/36892
3062 [36894]: https://github.com/rust-lang/rust/pull/36894
3063 [36917]: https://github.com/rust-lang/rust/pull/36917
3064 [36993]: https://github.com/rust-lang/rust/pull/36993
3065 [37037]: https://github.com/rust-lang/rust/pull/37037
3066 [37064]: https://github.com/rust-lang/rust/pull/37064
3067 [37094]: https://github.com/rust-lang/rust/pull/37094
3068 [37108]: https://github.com/rust-lang/rust/pull/37108
3069 [37111]: https://github.com/rust-lang/rust/pull/37111
3070 [37161]: https://github.com/rust-lang/rust/pull/37161
3071 [37162]: https://github.com/rust-lang/rust/pull/37162
3072 [37167]: https://github.com/rust-lang/rust/pull/37167
3073 [37178]: https://github.com/rust-lang/rust/pull/37178
3074 [37200]: https://github.com/rust-lang/rust/pull/37200
3075 [37213]: https://github.com/rust-lang/rust/pull/37213
3076 [37221]: https://github.com/rust-lang/rust/pull/37221
3077 [37224]: https://github.com/rust-lang/rust/pull/37224
3078 [37230]: https://github.com/rust-lang/rust/pull/37230
3079 [37231]: https://github.com/rust-lang/rust/pull/37231
3080 [37247]: https://github.com/rust-lang/rust/pull/37247
3081 [37267]: https://github.com/rust-lang/rust/pull/37267
3082 [37270]: https://github.com/rust-lang/rust/pull/37270
3083 [37273]: https://github.com/rust-lang/rust/pull/37273
3084 [37280]: https://github.com/rust-lang/rust/pull/37280
3085 [37298]: https://github.com/rust-lang/rust/pull/37298
3086 [37306]: https://github.com/rust-lang/rust/pull/37306
3087 [37310]: https://github.com/rust-lang/rust/pull/37310
3088 [37312]: https://github.com/rust-lang/rust/pull/37312
3089 [37313]: https://github.com/rust-lang/rust/pull/37313
3090 [37315]: https://github.com/rust-lang/rust/pull/37315
3091 [37318]: https://github.com/rust-lang/rust/pull/37318
3092 [37322]: https://github.com/rust-lang/rust/pull/37322
3093 [37326]: https://github.com/rust-lang/rust/pull/37326
3094 [37351]: https://github.com/rust-lang/rust/pull/37351
3095 [37356]: https://github.com/rust-lang/rust/pull/37356
3096 [37367]: https://github.com/rust-lang/rust/pull/37367
3097 [37373]: https://github.com/rust-lang/rust/pull/37373
3098 [37378]: https://github.com/rust-lang/rust/pull/37378
3099 [37389]: https://github.com/rust-lang/rust/pull/37389
3100 [37392]: https://github.com/rust-lang/rust/pull/37392
3101 [37427]: https://github.com/rust-lang/rust/pull/37427
3102 [37439]: https://github.com/rust-lang/rust/pull/37439
3103 [37445]: https://github.com/rust-lang/rust/pull/37445
3104 [37470]: https://github.com/rust-lang/rust/pull/37470
3105 [37569]: https://github.com/rust-lang/rust/pull/37569
3106 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3107 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3108 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3109 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3110 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3111 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3112 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3115 Version 1.13.0 (2016-11-10)
3116 ===========================
3121 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3122 errors, like the `try!` macro, described in [RFC 0243].
3123 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3124 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3125 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3126 * [Fix lifetime rules for 'if' conditions][36029]
3127 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3132 * [Add the `-C link-arg` argument][36574]
3133 * [Remove the old AST-based backend from rustc_trans][35764]
3134 * [Don't enable NEON by default on armv7 Linux][35814]
3135 * [Fix debug line number info for macro expansions][35238]
3136 * [Do not emit "class method" debuginfo for types that are not
3137 DICompositeType][36008]
3138 * [Warn about multiple conflicting #[repr] hints][34623]
3139 * [When sizing DST, don't double-count nested struct prefixes][36351]
3140 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3141 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3142 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3143 * [Expand macros without recursing to avoid stack overflows][36214]
3148 * [Replace macro backtraces with labeled local uses][35702]
3149 * [Improve error message for misplaced doc comments][33922]
3150 * [Buffer unix and lock windows to prevent message interleaving][35975]
3151 * [Update lifetime errors to specifically note temporaries][36171]
3152 * [Special case a few colors for Windows][36178]
3153 * [Suggest `use self` when such an import resolves][36289]
3154 * [Be more specific when type parameter shadows primitive type][36338]
3155 * Many minor improvements
3157 Compile-time Optimizations
3158 --------------------------
3160 * [Compute and cache HIR hashes at beginning][35854]
3161 * [Don't hash types in loan paths][36004]
3162 * [Cache projections in trans][35761]
3163 * [Optimize the parser's last token handling][36527]
3164 * [Only instantiate #[inline] functions in codegen units referencing
3165 them][36524]. This leads to big improvements in cases where crates export
3166 define many inline functions without using them directly.
3167 * [Lazily allocate TypedArena's first chunk][36592]
3168 * [Don't allocate during default HashSet creation][36734]
3175 * [`overflowing_abs`]
3176 * [`RefCell::try_borrow`]
3177 * [`RefCell::try_borrow_mut`]
3182 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3183 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3185 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3186 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3187 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3188 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3189 * [Use arc4rand on FreeBSD][35884]
3190 * [memrchr: Correct aligned offset computation][35969]
3191 * [Improve Demangling of Rust Symbols][36059]
3192 * [Use monotonic time in condition variables][35048]
3193 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3194 * [Implement conversion traits for `char`][35755]
3195 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3196 * [Zero first byte of CString on drop][36264]
3197 * [Inherit overflow checks for sum and product][36372]
3198 * [Add missing Eq implementations][36423]
3199 * [Implement `Debug` for `DirEntry`][36631]
3200 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3202 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3203 * [Implement more traits for `std::io::ErrorKind`][35911]
3204 * [Optimize BinaryHeap bounds checking][36072]
3205 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3206 `extend_with_element`][36355]
3207 * [Fix overflow checking in unsigned pow()][34942]
3212 * This release includes security fixes to both curl and OpenSSL.
3213 * [Fix transitive doctests when panic=abort][cargo/3021]
3214 * [Add --all-features flag to cargo][cargo/3038]
3215 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3216 * [Don't parse the home directory more than once][cargo/3078]
3217 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3218 * [Update OpenSSL to 1.0.2j][cargo/3121]
3219 * [Add license and license_file to cargo metadata output][cargo/3110]
3220 * [Make crates-io registry URL optional in config; ignore all changes to
3221 source.crates-io][cargo/3089]
3222 * [Don't download dependencies from other platforms][cargo/3123]
3223 * [Build transitive dev-dependencies when needed][cargo/3125]
3224 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3225 * [Avoid updating registry when adding existing deps][cargo/3144]
3226 * [Warn about path overrides that won't work][cargo/3136]
3227 * [Use workspaces during `cargo install`][cargo/3146]
3228 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3229 * [Add --message-format flag][cargo/3000]
3230 * [Pass target environment for rustdoc][cargo/3205]
3231 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3232 * [Update curl and curl-sys][cargo/3241]
3233 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3238 * [rustdoc: Add the `--sysroot` argument][36586]
3239 * [rustdoc: Fix a couple of issues with the search results][35655]
3240 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3241 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3242 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3247 * [Remove unmaintained style guide][35124]
3248 * [Add s390x support][36369]
3249 * [Initial work at Haiku OS support][36727]
3250 * [Add mips-uclibc targets][35734]
3251 * [Crate-ify compiler-rt into compiler-builtins][35021]
3252 * [Add rustc version info (git hash + date) to dist tarball][36213]
3253 * Many documentation improvements
3258 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3259 * [Deny (by default) transmuting from fn item types to pointer-sized
3260 types][34923]. Continuing the long transition to zero-sized fn items,
3262 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3264 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3265 * [Fix lifetime rules for 'if' conditions][36029].
3266 * [Inherit overflow checks for sum and product][36372].
3267 * [Forbid user-defined macros named "macro_rules"][36730].
3269 [33922]: https://github.com/rust-lang/rust/pull/33922
3270 [34623]: https://github.com/rust-lang/rust/pull/34623
3271 [34923]: https://github.com/rust-lang/rust/pull/34923
3272 [34942]: https://github.com/rust-lang/rust/pull/34942
3273 [34982]: https://github.com/rust-lang/rust/pull/34982
3274 [35021]: https://github.com/rust-lang/rust/pull/35021
3275 [35048]: https://github.com/rust-lang/rust/pull/35048
3276 [35074]: https://github.com/rust-lang/rust/pull/35074
3277 [35124]: https://github.com/rust-lang/rust/pull/35124
3278 [35234]: https://github.com/rust-lang/rust/pull/35234
3279 [35238]: https://github.com/rust-lang/rust/pull/35238
3280 [35354]: https://github.com/rust-lang/rust/pull/35354
3281 [35559]: https://github.com/rust-lang/rust/pull/35559
3282 [35585]: https://github.com/rust-lang/rust/pull/35585
3283 [35627]: https://github.com/rust-lang/rust/pull/35627
3284 [35655]: https://github.com/rust-lang/rust/pull/35655
3285 [35702]: https://github.com/rust-lang/rust/pull/35702
3286 [35707]: https://github.com/rust-lang/rust/pull/35707
3287 [35728]: https://github.com/rust-lang/rust/pull/35728
3288 [35734]: https://github.com/rust-lang/rust/pull/35734
3289 [35755]: https://github.com/rust-lang/rust/pull/35755
3290 [35761]: https://github.com/rust-lang/rust/pull/35761
3291 [35764]: https://github.com/rust-lang/rust/pull/35764
3292 [35814]: https://github.com/rust-lang/rust/pull/35814
3293 [35854]: https://github.com/rust-lang/rust/pull/35854
3294 [35871]: https://github.com/rust-lang/rust/pull/35871
3295 [35884]: https://github.com/rust-lang/rust/pull/35884
3296 [35911]: https://github.com/rust-lang/rust/pull/35911
3297 [35969]: https://github.com/rust-lang/rust/pull/35969
3298 [35975]: https://github.com/rust-lang/rust/pull/35975
3299 [36004]: https://github.com/rust-lang/rust/pull/36004
3300 [36008]: https://github.com/rust-lang/rust/pull/36008
3301 [36014]: https://github.com/rust-lang/rust/pull/36014
3302 [36029]: https://github.com/rust-lang/rust/pull/36029
3303 [36059]: https://github.com/rust-lang/rust/pull/36059
3304 [36072]: https://github.com/rust-lang/rust/pull/36072
3305 [36101]: https://github.com/rust-lang/rust/pull/36101
3306 [36104]: https://github.com/rust-lang/rust/pull/36104
3307 [36171]: https://github.com/rust-lang/rust/pull/36171
3308 [36173]: https://github.com/rust-lang/rust/pull/36173
3309 [36178]: https://github.com/rust-lang/rust/pull/36178
3310 [36213]: https://github.com/rust-lang/rust/pull/36213
3311 [36214]: https://github.com/rust-lang/rust/pull/36214
3312 [36264]: https://github.com/rust-lang/rust/pull/36264
3313 [36266]: https://github.com/rust-lang/rust/pull/36266
3314 [36289]: https://github.com/rust-lang/rust/pull/36289
3315 [36338]: https://github.com/rust-lang/rust/pull/36338
3316 [36351]: https://github.com/rust-lang/rust/pull/36351
3317 [36355]: https://github.com/rust-lang/rust/pull/36355
3318 [36369]: https://github.com/rust-lang/rust/pull/36369
3319 [36372]: https://github.com/rust-lang/rust/pull/36372
3320 [36423]: https://github.com/rust-lang/rust/pull/36423
3321 [36482]: https://github.com/rust-lang/rust/pull/36482
3322 [36505]: https://github.com/rust-lang/rust/pull/36505
3323 [36524]: https://github.com/rust-lang/rust/pull/36524
3324 [36527]: https://github.com/rust-lang/rust/pull/36527
3325 [36551]: https://github.com/rust-lang/rust/pull/36551
3326 [36574]: https://github.com/rust-lang/rust/pull/36574
3327 [36586]: https://github.com/rust-lang/rust/pull/36586
3328 [36592]: https://github.com/rust-lang/rust/pull/36592
3329 [36631]: https://github.com/rust-lang/rust/pull/36631
3330 [36639]: https://github.com/rust-lang/rust/pull/36639
3331 [36721]: https://github.com/rust-lang/rust/pull/36721
3332 [36727]: https://github.com/rust-lang/rust/pull/36727
3333 [36730]: https://github.com/rust-lang/rust/pull/36730
3334 [36734]: https://github.com/rust-lang/rust/pull/36734
3335 [36754]: https://github.com/rust-lang/rust/pull/36754
3336 [36995]: https://github.com/rust-lang/rust/pull/36995
3337 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3338 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3339 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3340 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3341 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3342 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3343 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3344 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3345 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3346 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3347 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3348 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3349 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3350 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3351 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3352 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3353 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3354 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3355 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3356 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3357 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3358 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3359 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3360 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3361 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3362 [rustup]: https://www.rustup.rs
3363 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3364 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3365 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3366 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3367 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3368 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3369 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3372 Version 1.12.1 (2016-10-20)
3373 ===========================
3378 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3379 * [Confusion with double negation and booleans][36856]
3380 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3381 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3382 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3383 * [Corrupted memory after updated to 1.12][36936]
3384 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3385 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3386 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3388 [36381]: https://github.com/rust-lang/rust/issues/36381
3389 [36856]: https://github.com/rust-lang/rust/issues/36856
3390 [36875]: https://github.com/rust-lang/rust/issues/36875
3391 [36924]: https://github.com/rust-lang/rust/issues/36924
3392 [36926]: https://github.com/rust-lang/rust/issues/36926
3393 [36936]: https://github.com/rust-lang/rust/issues/36936
3394 [37026]: https://github.com/rust-lang/rust/issues/37026
3395 [37112]: https://github.com/rust-lang/rust/issues/37112
3396 [37153]: https://github.com/rust-lang/rust/issues/37153
3399 Version 1.12.0 (2016-09-29)
3400 ===========================
3405 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3406 This translation pass is far simpler than the previous AST->LLVM pass, and
3407 creates opportunities to perform new optimizations directly on the MIR. It
3408 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3409 * [`rustc` presents a new, more readable error format, along with
3410 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3411 Most common editors supporting Rust have been updated to work with it. It was
3412 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3417 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3418 This translation pass is far simpler than the previous AST->LLVM pass, and
3419 creates opportunities to perform new optimizations directly on the MIR. It
3420 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3421 * [Print the Rust target name, not the LLVM target name, with
3422 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3423 * [The computation of `TypeId` is correct in some cases where it was previously
3424 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3425 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3426 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3427 `--print relocation-models`, and `--print code-models` print the available
3428 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3429 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3430 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3431 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3432 These targets produce statically-linked binaries. There are no binary release
3438 * [`rustc` presents a new, more readable error format, along with
3439 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3440 Most common editors supporting Rust have been updated to work with it. It was
3441 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3442 * [In error descriptions, references are now described in plain English,
3443 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3444 * [In error type descriptions, unknown numeric types are named `{integer}` or
3445 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3446 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3451 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3452 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3453 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3454 useful](https://github.com/rust-lang/rust/pull/34908)
3455 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3456 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3457 * [Semicolons are properly required as statement delimiters inside
3458 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3459 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3464 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3465 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3466 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3467 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3468 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3469 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3470 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3471 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3472 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3473 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3474 Both on Unix and Windows.
3475 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3476 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3477 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3478 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3479 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3480 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3481 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3482 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3487 * [The `format!` macro and friends now allow a single argument to be formatted
3488 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3489 * [The lifetime bounds on `[T]::binary_search_by` and
3490 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3491 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3492 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3493 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3494 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3495 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3496 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3497 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3498 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3499 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3500 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3501 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3502 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3503 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3504 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3505 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3506 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3507 * [`mpsc::sync_channel` `Receiver`s return any available message before
3508 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3509 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3510 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3515 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3516 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3517 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3518 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3519 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3520 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3521 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3522 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3523 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3524 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3525 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3526 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3527 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3528 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3529 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3530 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3535 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3536 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3541 * [Test binaries now support a `--test-threads` argument to specify the number
3542 of threads used to run tests, and which acts the same as the
3543 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3544 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3545 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3546 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3547 * [Rust releases now come with source packages that can be installed by rustup
3548 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3549 The resulting source code can be used by tools and IDES, located in the
3550 sysroot under `lib/rustlib/src`.
3555 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3556 * Many minor improvements to the documentation.
3557 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3562 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3563 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3564 * [When formatting strings, if "precision" is specified, the "fill",
3565 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3566 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3569 Version 1.11.0 (2016-08-18)
3570 ===========================
3575 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3576 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3577 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3578 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3579 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3584 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3585 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3586 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3587 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3588 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3589 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3590 (in libcore - previously stabilized in libstd)
3591 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3592 (in libcore - previously stabilized in libstd)
3593 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3594 (in libcore - previously stabilized in libstd)
3595 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3596 (in libcore - previously stabilized in libstd)
3597 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3598 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3599 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3600 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3605 * [The `thread_local!` macro supports multiple definitions in a single
3606 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3607 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3608 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3609 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3610 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3611 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3612 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3613 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3618 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3619 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3620 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3621 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3622 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3623 and `-vv` prints warnings for all crates.
3624 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3625 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3626 This provides room for expansion by arbitrary tools.
3627 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3628 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3629 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3630 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3631 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3632 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3633 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3638 * [Caching projections speeds up type check dramatically for some
3639 workloads](https://github.com/rust-lang/rust/pull/33816)
3640 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3641 This hasher is faster, but is believed to provide sufficient
3642 protection from collision attacks.
3643 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3648 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3649 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3650 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3651 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3652 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3657 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3658 * [When emitting debug info, rustc emits frame pointers for closures,
3659 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3660 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3661 * Many more errors have been given error codes and extended
3663 * API documentation continues to be improved, with many new examples
3668 * [rustc no longer hangs when dependencies recursively re-export
3669 submodules](https://github.com/rust-lang/rust/pull/34542)
3670 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3671 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3672 rewritten](https://github.com/rust-lang/rust/pull/33895)
3673 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3674 No targets use this yet, but it works toward AVR support.
3679 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3680 * [The new follow-set rules that place restrictions on `macro_rules!`
3681 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3682 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3683 and has been a warning since 1.10.
3684 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3685 This causes breakage in some corner cases.
3688 Version 1.10.0 (2016-07-07)
3689 ===========================
3694 * [Allow `concat_idents!` in type positions as well as in expression
3695 positions](https://github.com/rust-lang/rust/pull/33735).
3696 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3697 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3698 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3699 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3700 * [`panic!` can be converted to a runtime abort with the
3701 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3702 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3703 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3704 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3705 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3706 Note that Cargo does not yet directly support cdylibs.
3711 * `os::windows::fs::OpenOptionsExt::access_mode`
3712 * `os::windows::fs::OpenOptionsExt::share_mode`
3713 * `os::windows::fs::OpenOptionsExt::custom_flags`
3714 * `os::windows::fs::OpenOptionsExt::attributes`
3715 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3716 * `os::unix::fs::OpenOptionsExt::custom_flags`
3717 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3718 * `Default for sync::Weak`
3719 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3720 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3721 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3722 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3723 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3724 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3725 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3726 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3727 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3728 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3729 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3730 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3731 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3732 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3733 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3734 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3735 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3736 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3737 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3738 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3739 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3740 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3741 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3742 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3743 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3744 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3745 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3746 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3747 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3748 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3749 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3750 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3751 * Read/Write/RawFd impls for `UnixStream`
3752 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3753 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3754 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3755 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3756 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3757 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3758 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3759 * RawFd impls for `UnixListener`
3760 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3761 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3762 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3763 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3764 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3765 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3766 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3767 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3768 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3769 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3770 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3771 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3772 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3773 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3774 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3775 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3776 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3777 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3778 * RawFd impls for `UnixDatagram`
3779 * `{BTree,Hash}Map::values_mut`
3780 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3785 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3786 The semantics of this minor method are subtle and probably not what
3788 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3789 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3790 will fall back to `/dev/urandom` temporarily to avoid blocking
3791 during early boot](https://github.com/rust-lang/rust/pull/33086).
3792 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3793 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3794 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3795 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3796 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3797 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3798 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3802 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3803 This controls the runtime behavior of the `panic!` macro
3804 and can be either "unwind" (the default), or "abort".
3805 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3806 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3807 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3808 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3809 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3810 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3811 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3812 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3813 By default they are retried twice, which can be customized with the
3814 `net.retry` value in `.cargo/config`.
3815 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3816 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3817 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3818 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3819 Makes it possible to install multiple crates in parallel.
3820 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3821 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3822 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3823 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3824 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3825 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3830 * [rustc memory usage was reduced by refactoring the context used for
3831 type checking](https://github.com/rust-lang/rust/pull/33425).
3832 * [Speed up creation of `HashMap`s by caching the random keys used
3833 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3834 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3835 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3836 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3837 10x faster than the previous lookup tables.
3838 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3843 * Many incremental improvements to documentation and rustdoc.
3844 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3845 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3846 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3847 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3848 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3849 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3850 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3855 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3856 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3857 * [`std` no longer prints backtraces on platforms where the running
3858 module must be loaded with `env::current_exe`, which can't be relied
3859 on](https://github.com/rust-lang/rust/pull/33554).
3860 * This release includes std binaries for the i586-unknown-linux-gnu,
3861 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3862 i586 target is for old x86 hardware without SSE2, and the armv7
3863 target is for Android running on modern ARM architectures.
3864 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3865 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3866 * [On Unix the runtime aborts by calling `libc::abort` instead of
3867 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3868 * [Rust is now bootstrapped from the previous release of Rust,
3869 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3874 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3875 * [`target_env` for Linux ARM targets is just `gnu`, not
3876 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3877 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3878 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3879 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3880 Affects how macros are parsed.
3881 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3882 * [Feature-gated attributes on macro-generated macro invocations are
3883 now rejected](https://github.com/rust-lang/rust/pull/32791).
3884 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3885 This caused some minor changes to type inference.
3888 Version 1.9.0 (2016-05-26)
3889 ==========================
3894 * The `#[deprecated]` attribute when applied to an API will generate
3895 warnings when used. The warnings may be suppressed with
3896 `#[allow(deprecated)]`. [RFC 1270].
3897 * [`fn` item types are zero sized, and each `fn` names a unique
3898 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3899 `transmute` on a `fn` type will generate a warning for a few cycles,
3900 then will be converted to an error.
3901 * [Field and method resolution understand visibility, so private
3902 fields and methods cannot prevent the proper use of public fields
3903 and methods][1.9fv].
3904 * [The parser considers unicode codepoints in the
3905 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3911 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3912 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3913 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3914 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3915 * [`str::is_char_boundary`]
3916 * [`<*const T>::as_ref`]
3917 * [`<*mut T>::as_ref`]
3918 * [`<*mut T>::as_mut`]
3919 * [`AsciiExt::make_ascii_uppercase`]
3920 * [`AsciiExt::make_ascii_lowercase`]
3921 * [`char::decode_utf16`]
3922 * [`char::DecodeUtf16`]
3923 * [`char::DecodeUtf16Error`]
3924 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3925 * [`BTreeSet::take`]
3926 * [`BTreeSet::replace`]
3929 * [`HashSet::replace`]
3931 * [`OsString::with_capacity`]
3932 * [`OsString::clear`]
3933 * [`OsString::capacity`]
3934 * [`OsString::reserve`]
3935 * [`OsString::reserve_exact`]
3936 * [`OsStr::is_empty`]
3938 * [`std::os::unix::thread`]
3941 * [`JoinHandleExt::as_pthread_t`]
3942 * [`JoinHandleExt::into_pthread_t`]
3943 * [`HashSet::hasher`]
3944 * [`HashMap::hasher`]
3945 * [`CommandExt::exec`]
3946 * [`File::try_clone`]
3947 * [`SocketAddr::set_ip`]
3948 * [`SocketAddr::set_port`]
3949 * [`SocketAddrV4::set_ip`]
3950 * [`SocketAddrV4::set_port`]
3951 * [`SocketAddrV6::set_ip`]
3952 * [`SocketAddrV6::set_port`]
3953 * [`SocketAddrV6::set_flowinfo`]
3954 * [`SocketAddrV6::set_scope_id`]
3955 * [`slice::copy_from_slice`]
3956 * [`ptr::read_volatile`]
3957 * [`ptr::write_volatile`]
3958 * [`OpenOptions::create_new`]
3959 * [`TcpStream::set_nodelay`]
3960 * [`TcpStream::nodelay`]
3961 * [`TcpStream::set_ttl`]
3962 * [`TcpStream::ttl`]
3963 * [`TcpStream::set_only_v6`]
3964 * [`TcpStream::only_v6`]
3965 * [`TcpStream::take_error`]
3966 * [`TcpStream::set_nonblocking`]
3967 * [`TcpListener::set_ttl`]
3968 * [`TcpListener::ttl`]
3969 * [`TcpListener::set_only_v6`]
3970 * [`TcpListener::only_v6`]
3971 * [`TcpListener::take_error`]
3972 * [`TcpListener::set_nonblocking`]
3973 * [`UdpSocket::set_broadcast`]
3974 * [`UdpSocket::broadcast`]
3975 * [`UdpSocket::set_multicast_loop_v4`]
3976 * [`UdpSocket::multicast_loop_v4`]
3977 * [`UdpSocket::set_multicast_ttl_v4`]
3978 * [`UdpSocket::multicast_ttl_v4`]
3979 * [`UdpSocket::set_multicast_loop_v6`]
3980 * [`UdpSocket::multicast_loop_v6`]
3981 * [`UdpSocket::set_multicast_ttl_v6`]
3982 * [`UdpSocket::multicast_ttl_v6`]
3983 * [`UdpSocket::set_ttl`]
3984 * [`UdpSocket::ttl`]
3985 * [`UdpSocket::set_only_v6`]
3986 * [`UdpSocket::only_v6`]
3987 * [`UdpSocket::join_multicast_v4`]
3988 * [`UdpSocket::join_multicast_v6`]
3989 * [`UdpSocket::leave_multicast_v4`]
3990 * [`UdpSocket::leave_multicast_v6`]
3991 * [`UdpSocket::take_error`]
3992 * [`UdpSocket::connect`]
3993 * [`UdpSocket::send`]
3994 * [`UdpSocket::recv`]
3995 * [`UdpSocket::set_nonblocking`]
4000 * [`std::sync::Once` is poisoned if its initialization function
4002 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4003 * [Most types implement `fmt::Debug`][1.9db].
4004 * [The default buffer size used by `BufReader` and `BufWriter` was
4005 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4006 used by other languages.
4007 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4008 `Duration` additionally implements `*=` and `/=`][1.9ta].
4009 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4010 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4011 * [`Chain` implements `BufRead`][1.9ch].
4012 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4017 * [Cargo can now run concurrently][1.9cc].
4018 * [Top-level overrides allow specific revisions of crates to be
4019 overridden through the entire crate graph][1.9ct]. This is intended
4020 to make upgrades easier for large projects, by allowing crates to be
4021 forked temporarily until they've been upgraded and republished.
4022 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4023 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4024 on the commandline][1.9cf]. `rustc` arguments can also be specified
4025 in the `build.rustflags` configuration key.
4030 * [The time complexity of comparing variables for equivalence during type
4031 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4032 to major compilation time improvement in some scenarios.
4033 * [`ToString` is specialized for `str`, giving it the same performance
4034 as `to_owned`][1.9ts].
4035 * [Spawning processes with `Command::output` no longer creates extra
4037 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4038 for C-like enums][1.9cl].
4043 * [Passing the `--quiet` flag to a test runner will produce
4044 much-abbreviated output][1.9q].
4045 * The Rust Project now publishes std binaries for the
4046 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4047 `i586-pc-windows-msvc` targets.
4052 * [`std::sync::Once` is poisoned if its initialization function
4054 * [It is illegal to define methods with the same name in overlapping
4055 inherent `impl` blocks][1.9sn].
4056 * [`fn` item types are zero sized, and each `fn` names a unique
4057 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4058 `transmute` on a `fn` type will generate a warning for a few cycles,
4059 then will be converted to an error.
4060 * [Improvements to const evaluation may trigger new errors when integer
4061 literals are out of range][1.9ce].
4064 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4065 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4066 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4067 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4068 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4069 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4070 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4071 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4072 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4073 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4074 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4075 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4076 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4077 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4078 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4079 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4080 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4081 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4082 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4083 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4084 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4085 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4086 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4087 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4088 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4089 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4090 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4091 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4092 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4093 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4094 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4095 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4096 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4097 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4098 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4099 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4100 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4101 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4102 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4103 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4104 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4105 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4106 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4107 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4108 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4109 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4110 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4111 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4112 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4113 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4114 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4115 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4116 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4117 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4118 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4119 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4120 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4121 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4122 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4123 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4124 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4125 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4126 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4127 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4128 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4129 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4130 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4131 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4132 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4133 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4134 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4135 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4136 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4137 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4138 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4139 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4140 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4141 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4142 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4143 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4144 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4145 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4146 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4147 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4148 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4149 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4150 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4151 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4152 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4153 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4154 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4155 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4156 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4157 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4158 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4159 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4160 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4161 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4162 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4163 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4164 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4165 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4166 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4167 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4168 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4169 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4170 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4171 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4172 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4173 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4176 Version 1.8.0 (2016-04-14)
4177 ==========================
4182 * Rust supports overloading of compound assignment statements like
4183 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4184 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4185 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4187 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4188 addition to the non-braced form, `struct Foo;`. [RFC 218].
4194 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4195 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4198 * [`ptr::drop_in_place`]
4200 * [`time::SystemTime`]
4202 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4203 * [`Instant::elapsed`]
4204 * [`SystemTime::now`]
4205 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4206 * [`SystemTime::elapsed`]
4207 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4208 * [`SystemTimeError`]
4209 * [`SystemTimeError::duration`]
4210 * Various impls for `SystemTimeError`
4212 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4213 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4214 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4215 * [The `write!` and `writeln!` macros correctly emit errors if any of
4216 their arguments can't be formatted][1.8w].
4217 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4218 * [The Unix-specific `raw` modules, which contain a number of
4219 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4220 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4221 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4222 across platforms was making it difficult to implement `std`
4223 correctly. Those that need these definitions should use the `libc`
4225 * The Unix-specific `MetadataExt` traits, including
4226 `os::unix::fs::MetadataExt`, which expose values such as inode
4227 numbers [no longer return platform-specific types][1.8r], but
4228 instead return widened integers. [RFC 1415].
4229 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4230 * [Atomic loads and stores are not volatile][1.8a].
4231 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4236 * [Inlining hash functions lead to a 3% compile-time improvement in
4237 some workloads][1.8h].
4238 * When using jemalloc, its symbols are [unprefixed so that it
4239 overrides the libc malloc implementation][1.8h]. This means that for
4240 rustc, LLVM is now using jemalloc, which results in a 6%
4241 compile-time improvement on a specific workload.
4242 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4247 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4248 i686-pc-windows-msvc is now considered a tier-1 platform.
4249 * [The `--print targets` flag prints a list of supported targets][1.8t].
4250 * [The `--print cfg` flag prints the `cfg`s defined for the current
4252 * [`rustc` can be built with an new Cargo-based build system, written
4253 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4254 build system. To enable it configure with `configure --rustbuild`.
4255 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4256 variants while also indicating the total number of missing variants
4257 if more than 3][1.8m].
4258 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4259 * The Rust Project now publishes binary releases of the standard
4260 library for a number of tier-2 targets:
4261 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4262 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4263 `x86_64-rumprun-netbsd`. These can be installed with
4264 tools such as [multirust][1.8mr].
4269 * [`cargo init` creates a new Cargo project in the current
4270 directory][1.8ci]. It is otherwise like `cargo new`.
4271 * [Cargo has configuration keys for `-v` and
4272 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4273 `[term]` section of `.cargo/config`.
4274 * [Configuration keys that evaluate to strings or integers can be set
4275 via environment variables][1.8ce]. For example the `build.jobs` key
4276 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4277 precedence over config files.
4278 * [Target-specific dependencies support Rust `cfg` syntax for
4279 describing targets][1.8cfg] so that dependencies for multiple
4280 targets can be specified together. [RFC 1361].
4281 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4282 `RUSTDOC` take precedence over the `build.target-dir`,
4283 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4284 * [The child process tree is killed on Windows when Cargo is
4286 * [The `build.target` configuration value sets the target platform,
4287 like `--target`][1.8ct].
4292 * [Unstable compiler flags have been further restricted][1.8u]. Since
4293 1.0 `-Z` flags have been considered unstable, and other flags that
4294 were considered unstable additionally required passing `-Z
4295 unstable-options` to access. Unlike unstable language and library
4296 features though, these options have been accessible on the stable
4297 release channel. Going forward, *new unstable flags will not be
4298 available on the stable release channel*, and old unstable flags
4299 will warn about their usage. In the future, all unstable flags will
4300 be unavailable on the stable release channel.
4301 * [It is no longer possible to `match` on empty enum variants using
4302 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4303 * The Unix-specific `MetadataExt` traits, including
4304 `os::unix::fs::MetadataExt`, which expose values such as inode
4305 numbers [no longer return platform-specific types][1.8r], but
4306 instead return widened integers. [RFC 1415].
4307 * [Modules sourced from the filesystem cannot appear within arbitrary
4308 blocks, but only within other modules][1.8mf].
4309 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4310 * On Unix, [stack overflow triggers a runtime abort instead of a
4312 * [`Command::spawn` and its equivalents return an error if any of
4313 its command-line arguments contain interior `NUL`s][1.8n].
4314 * [Tuple and unit enum variants from other crates are in the type
4316 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4317 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4318 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4319 instead of `foo.lib`.
4322 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4323 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4324 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4325 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4326 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4327 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4328 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4329 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4330 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4331 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4332 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4333 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4334 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4335 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4336 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4337 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4338 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4339 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4340 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4341 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4342 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4343 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4344 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4345 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4346 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4347 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4348 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4349 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4350 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4351 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4352 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4353 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4354 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4355 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4356 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4357 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4358 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4359 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4360 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4361 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4362 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4363 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4364 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4365 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4366 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4367 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4368 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4369 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4370 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4371 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4372 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4373 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4374 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4375 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4376 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4377 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4378 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4379 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4380 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4381 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4384 Version 1.7.0 (2016-03-03)
4385 ==========================
4392 * [`Path::strip_prefix`][] (renamed from relative_from)
4393 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4395 * [`Ipv4Addr::is_loopback`]
4396 * [`Ipv4Addr::is_private`]
4397 * [`Ipv4Addr::is_link_local`]
4398 * [`Ipv4Addr::is_multicast`]
4399 * [`Ipv4Addr::is_broadcast`]
4400 * [`Ipv4Addr::is_documentation`]
4402 * [`Ipv6Addr::is_unspecified`]
4403 * [`Ipv6Addr::is_loopback`]
4404 * [`Ipv6Addr::is_multicast`]
4407 * [`Vec::as_mut_slice`]
4409 * [`String::as_str`]
4410 * [`String::as_mut_str`]
4412 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4414 * `<[T]>::`[`sort_by_key`]
4415 * checked, saturated, and overflowing operations
4416 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4417 * [`i32::saturating_mul`]
4418 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4419 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4420 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4421 * [`u32::saturating_mul`]
4422 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4423 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4424 * and checked, saturated, and overflowing operations for other primitive types
4426 * [`ffi::IntoStringError`]
4427 * [`CString::into_string`]
4428 * [`CString::into_bytes`]
4429 * [`CString::into_bytes_with_nul`]
4430 * `From<CString> for Vec<u8>`
4432 * [`IntoStringError::into_cstring`]
4433 * [`IntoStringError::utf8_error`]
4434 * `Error for IntoStringError`
4436 * [`std::hash::BuildHasher`]
4437 * [`BuildHasher::Hasher`]
4438 * [`BuildHasher::build_hasher`]
4439 * [`std::hash::BuildHasherDefault`]
4440 * [`HashMap::with_hasher`]
4441 * [`HashMap::with_capacity_and_hasher`]
4442 * [`HashSet::with_hasher`]
4443 * [`HashSet::with_capacity_and_hasher`]
4444 * [`std::collections::hash_map::RandomState`]
4445 * [`RandomState::new`]
4446 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4447 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4448 from bytes is faster.
4449 * [The performance of `LineWriter` (and thus `io::stdout`) was
4450 improved by using `memchr` to search for newlines][1.7m].
4451 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4452 `f64` variants were stabilized previously.
4453 * [`BTreeMap` was rewritten to use less memory and improve the performance
4454 of insertion and iteration, the latter by as much as 5x][1.7bm].
4455 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4456 covariant over their contained type][1.7bt].
4457 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4458 over their contained type][1.7ll].
4459 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4461 * [`Any` is implemented for unsized types][1.7a].
4462 * [`Hash` is implemented for `Duration`][1.7h].
4467 * [When running tests with `--test`, rustdoc will pass `--cfg`
4468 arguments to the compiler][1.7dt].
4469 * [The compiler is built with RPATH information by default][1.7rpa].
4470 This means that it will be possible to run `rustc` when installed in
4471 unusual configurations without configuring the dynamic linker search
4473 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4474 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4475 over `LD_LIBRARY_PATH`.
4480 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4481 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4482 * [The `rerun-if-changed` build script directive no longer causes the
4483 build script to incorrectly run twice in certain scenarios][1.7rr].
4488 * Soundness fixes to the interactions between associated types and
4489 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4490 code that violates the new rules. This is a significant change that
4491 is known to break existing code, so it has emitted warnings for the
4492 new error cases since 1.4 to give crate authors time to adapt. The
4493 details of what is changing are subtle; read the RFC for more.
4494 * [Several bugs in the compiler's visibility calculations were
4495 fixed][1.7v]. Since this was found to break significant amounts of
4496 code, the new errors will be emitted as warnings for several release
4497 cycles, under the `private_in_public` lint.
4498 * Defaulted type parameters were accidentally accepted in positions
4499 that were not intended. In this release, [defaulted type parameters
4500 appearing outside of type definitions will generate a
4501 warning][1.7d], which will become an error in future releases.
4502 * [Parsing "." as a float results in an error instead of 0][1.7p].
4503 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4504 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4506 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4507 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4508 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4509 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4510 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4511 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4512 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4513 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4514 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4515 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4516 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4517 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4518 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4519 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4520 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4521 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4522 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4523 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4524 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4525 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4526 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4527 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4528 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4529 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4530 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4531 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4532 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4533 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4534 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4535 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4536 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4537 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4538 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4539 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4540 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4541 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4542 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4543 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4544 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4545 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4546 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4547 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4548 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4549 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4550 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4551 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4552 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4553 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4554 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4555 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4556 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4557 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4558 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4559 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4560 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4561 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4562 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4563 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4564 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4565 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4566 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4567 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4568 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4569 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4570 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4571 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4572 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4573 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4574 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4575 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4576 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4577 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4578 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4579 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4580 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4581 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4582 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4583 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4584 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4587 Version 1.6.0 (2016-01-21)
4588 ==========================
4593 * The `#![no_std]` attribute causes a crate to not be linked to the
4594 standard library, but only the [core library][1.6co], as described
4595 in [RFC 1184]. The core library defines common types and traits but
4596 has no platform dependencies whatsoever, and is the basis for Rust
4597 software in environments that cannot support a full port of the
4598 standard library, such as operating systems. Most of the core
4599 library is now stable.
4605 [`Read::read_exact`],
4606 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4607 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4608 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4609 [`os::unix::fs::DirBuilderExt`],
4610 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4611 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4612 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4613 [`collections::hash_map::Drain`],
4614 [`collections::hash_map::HashMap::drain`],
4615 [`collections::hash_set::Drain`],
4616 [`collections::hash_set::HashSet::drain`],
4617 [`collections::binary_heap::Drain`],
4618 [`collections::binary_heap::BinaryHeap::drain`],
4619 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4620 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4621 [`RwLock::into_inner`],
4622 [`Iterator::min_by_key`][] (renamed from `min_by`),
4623 [`Iterator::max_by_key`][] (renamed from `max_by`).
4624 * The [core library][1.6co] is stable, as are most of its APIs.
4625 * [The `assert_eq!` macro supports arguments that don't implement
4626 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4628 * Several timer functions that take duration in milliseconds [are
4629 deprecated in favor of those that take `Duration`][1.6ms]. These
4630 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4631 `thread::park_timeout_ms`.
4632 * The algorithm by which `Vec` reserves additional elements was
4633 [tweaked to not allocate excessive space][1.6a] while still growing
4635 * `From` conversions are [implemented from integers to floats][1.6f]
4636 in cases where the conversion is lossless. Thus they are not
4637 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4638 or `f64`. They are also not implemented for `isize` and `usize`
4639 because the implementations would be platform-specific. `From` is
4640 also implemented from `f32` to `f64`.
4641 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4642 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4643 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4644 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4646 * Sorting slices that are already sorted [is 50% faster in some
4652 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4653 * Cargo build scripts can specify their dependencies by emitting the
4654 [`rerun-if-changed`][1.6rr] key.
4655 * crates.io will reject publication of crates with dependencies that
4656 have a wildcard version constraint. Crates with wildcard
4657 dependencies were seen to cause a variety of problems, as described
4658 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4660 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4661 release folder. A variety of artifacts that Cargo failed to clean
4662 are now correctly deleted.
4667 * The `unreachable_code` lint [warns when a function call's argument
4669 * The parser indicates [failures that may be caused by
4670 confusingly-similar Unicode characters][1.6uc]
4671 * Certain macro errors [are reported at definition time][1.6m], not
4677 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4678 environment variable when locating crates. This was a pre-cargo
4679 feature for integrating with the package manager that was
4680 accidentally never removed.
4681 * [A number of bugs were fixed in the privacy checker][1.6p] that
4682 could cause previously-accepted code to break.
4683 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4684 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4685 struct pattern syntax (`Foo(..)`) can no longer be used to match
4686 unit structs. This is a warning now, but will become an error in
4687 future releases. Patterns that share the same name as a const are
4689 * A bug was fixed that causes [rustc not to apply default type
4690 parameters][1.6xc] when resolving certain method implementations of
4691 traits defined in other crates.
4693 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4694 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4695 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4696 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4697 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4698 [1.6co]: http://doc.rust-lang.org/core/index.html
4699 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4700 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4701 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4702 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4703 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4704 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4705 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4706 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4707 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4708 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4709 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4710 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4711 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4712 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4713 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4714 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4715 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4716 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4717 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4718 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4719 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4720 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4721 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4722 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4723 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4724 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4725 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4726 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4727 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4728 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4729 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4730 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4731 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4732 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4733 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4734 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4735 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4736 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4737 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4738 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4739 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4742 Version 1.5.0 (2015-12-10)
4743 ==========================
4745 * ~700 changes, numerous bugfixes
4751 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4752 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4753 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4754 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4755 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4756 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4757 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4758 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4759 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4760 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4761 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4762 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4763 [`Path::read_link`], [`Path::symlink_metadata`],
4764 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4765 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4766 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4767 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4768 [`slice::split_first_mut`], [`slice::split_first`],
4769 [`slice::split_last_mut`], [`slice::split_last`],
4770 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4771 [`str::MatchIndices`], [`str::RMatchIndices`],
4772 [`str::match_indices`], [`str::rmatch_indices`],
4773 [`str::slice_mut_unchecked`], [`string::ParseError`].
4774 * Rust applications hosted on crates.io can be installed locally to
4775 `~/.cargo/bin` with the [`cargo install`] command. Among other
4776 things this makes it easier to augment Cargo with new subcommands:
4777 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4778 invoked as `cargo foo`.
4779 * Crates with wildcard (`*`) dependencies will [emit warnings when
4780 published][1.5w]. In 1.6 it will no longer be possible to publish
4781 crates with wildcard dependencies.
4786 * The rules determining when a particular lifetime must outlive
4787 a particular value (known as '[dropck]') have been [modified
4788 to not rely on parametricity][1.5p].
4789 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4790 and `Arc`][1.5a]. Because these smart pointer types implement
4791 `Deref`, this causes breakage in cases where the interior type
4792 contains methods of the same name.
4793 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4794 that they could drop their content. Soundness fix.
4795 * All method invocations are [properly checked][1.5wf1] for
4796 [well-formedness][1.5wf2]. Soundness fix.
4797 * Traits whose supertraits contain `Self` are [not object
4798 safe][1.5o]. Soundness fix.
4799 * Target specifications support a [`no_default_libraries`][1.5nd]
4800 setting that controls whether `-nodefaultlibs` is passed to the
4801 linker, and in turn the `is_like_windows` setting no longer affects
4802 the `-nodefaultlibs` flag.
4803 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4804 * The `#[inline]` and `#[repr]` attributes [can only appear
4805 in valid locations][1.5at].
4806 * Native libraries linked from the local crate are [passed to
4807 the linker before native libraries from upstream crates][1.5nl].
4808 * Two rarely-used attributes, `#[no_debug]` and
4809 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4810 * Negation of unsigned integers, which has been a warning for
4811 several releases, [is now behind a feature gate and will
4812 generate errors][1.5nu].
4813 * The parser accidentally accepted visibility modifiers on
4814 enum variants, a bug [which has been fixed][1.5ev].
4815 * [A bug was fixed that allowed `use` statements to import unstable
4821 * When evaluating expressions at compile-time that are not
4822 compile-time constants (const-evaluating expressions in non-const
4823 contexts), incorrect code such as overlong bitshifts and arithmetic
4824 overflow will [generate a warning instead of an error][1.5ce],
4825 delaying the error until runtime. This will allow the
4826 const-evaluator to be expanded in the future backwards-compatibly.
4827 * The `improper_ctypes` lint [no longer warns about using `isize` and
4828 `usize` in FFI][1.5ict].
4833 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4835 * `Default` is [implemented for mutable slices][1.5d].
4836 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4837 * There are now `From` conversions [between floating point
4838 types][1.5f] where the conversions are lossless.
4839 * There are now `From` conversions [between integer types][1.5i] where
4840 the conversions are lossless.
4841 * [`fs::Metadata` implements `Clone`][1.5fs].
4842 * The `parse` method [accepts a leading "+" when parsing
4844 * [`AsMut` is implemented for `Vec`][1.5am].
4845 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4846 been optimized][1.5cf] and no longer rely on the default impl.
4847 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4848 `unsafe extern "C"` function types now [implement `Clone`,
4849 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4850 `fmt::Debug` for up to 12 arguments][1.5fp].
4851 * [Dropping `Vec`s is much faster in unoptimized builds when the
4852 element types don't implement `Drop`][1.5dv].
4853 * A bug that caused in incorrect behavior when [combining `VecDeque`
4854 with zero-sized types][1.5vdz] was resolved.
4855 * [`PartialOrd` for slices is faster][1.5po].
4860 * [Crate metadata size was reduced by 20%][1.5md].
4861 * [Improvements to code generation reduced the size of libcore by 3.3
4862 MB and rustc's memory usage by 18MB][1.5m].
4863 * [Improvements to deref translation increased performance in
4864 unoptimized builds][1.5dr].
4865 * Various errors in trait resolution [are deduplicated to only be
4866 reported once][1.5te].
4867 * Rust has preliminary [support for rumprun kernels][1.5rr].
4868 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4870 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4871 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4872 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4873 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4874 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4875 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4876 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4877 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4878 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4879 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4880 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4881 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4882 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4883 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4884 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4885 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4886 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4887 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4888 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4889 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4890 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4891 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4892 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4893 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4894 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4895 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4896 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4897 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4898 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4899 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4900 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4901 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4902 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4903 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4904 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4905 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4906 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4907 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4908 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4909 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4910 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4911 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4912 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4913 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4914 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4915 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4916 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4917 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4918 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4919 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4920 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4921 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4922 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4923 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4924 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4925 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4926 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4927 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4928 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4929 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4930 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4931 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4932 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4933 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4934 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4935 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4936 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4937 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4938 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4939 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4940 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4941 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4942 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4943 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4944 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4945 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4946 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4947 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4948 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4949 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4950 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4951 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4952 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4953 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4954 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4955 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4956 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4957 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4958 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4960 Version 1.4.0 (2015-10-29)
4961 ==========================
4963 * ~1200 changes, numerous bugfixes
4968 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4969 GNU) are now supported and recommended for use.
4974 * [Several changes have been made to fix type soundness and improve
4975 the behavior of associated types][sound]. See [RFC 1214]. Although
4976 we have mostly introduced these changes as warnings this release, to
4977 become errors next release, there are still some scenarios that will
4978 see immediate breakage.
4979 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4980 line breaks in addition to `\n`][crlf].
4981 * [Loans of `'static` lifetime extend to the end of a function][stat].
4982 * [`str::parse` no longer introduces avoidable rounding error when
4983 parsing floating point numbers. Together with earlier changes to
4984 float formatting/output, "round trips" like f.to_string().parse()
4985 now preserve the value of f exactly. Additionally, leading plus
4986 signs are now accepted][fp3].
4992 * `use` statements that import multiple items [can now rename
4993 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4994 * [Binops work correctly on fat pointers][binfat].
4995 * `pub extern crate`, which does not behave as expected, [issues a
4996 warning][pec] until a better solution is found.
5001 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5002 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5003 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5004 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5005 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5006 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5007 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5008 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5009 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5010 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5011 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5012 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5013 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5014 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5015 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5016 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5017 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5018 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5020 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5021 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5022 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5023 `f64::from_str_radix`.
5024 * [Reverse-searching strings is faster with the 'two-way'
5026 * [`std::io::copy` allows `?Sized` arguments][cc].
5027 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5028 [override `count`, `nth` and `last` with an O(1)
5029 implementation][it].
5030 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5031 * [`IntoRawFd` has been added to the Unix-specific prelude,
5032 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5034 * [`Extend<String>` and `FromIterator<String` are both implemented for
5036 * [`IntoIterator` is implemented for references to `Option` and
5038 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5039 Copy`][ext] as part of [RFC 839]. This will cause type inference
5040 breakage in rare situations.
5041 * [`BinaryHeap` implements `Debug`][bh2].
5042 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5044 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5045 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5046 * [String comparison is faster][faststr].
5047 * `&mut T` where `T: std::fmt::Write` [also implements
5048 `std::fmt::Write`][mutw].
5049 * [A stable regression in `VecDeque::push_back` and other
5050 capacity-altering methods that caused panics for zero-sized types
5052 * [Function pointers implement traits for up to 12 parameters][fp2].
5057 * The compiler [no longer uses the 'morestack' feature to prevent
5058 stack overflow][mm]. Instead it uses guard pages and stack
5059 probes (though stack probes are not yet implemented on any platform
5061 * [The compiler matches traits faster when projections are involved][p].
5062 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5064 * [Cargo now displays useful information about what its doing during
5065 `cargo update`][cu].
5067 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5068 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5069 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5070 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5071 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5072 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5073 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5074 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5075 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5076 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5077 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5078 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5079 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5080 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5081 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5082 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5083 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5084 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5085 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5086 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5087 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5088 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5089 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5090 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5091 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5092 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5093 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5094 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5095 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5096 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5097 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5098 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5099 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5100 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5101 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5102 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5103 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5104 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5105 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5106 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5107 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5108 [bh2]: https://github.com/rust-lang/rust/pull/28156
5109 [binfat]: https://github.com/rust-lang/rust/pull/28270
5110 [bm]: https://github.com/rust-lang/rust/pull/28197
5111 [cc]: https://github.com/rust-lang/rust/pull/27531
5112 [crlf]: https://github.com/rust-lang/rust/pull/28034
5113 [cu]: https://github.com/rust-lang/cargo/pull/1931
5114 [d]: https://github.com/rust-lang/rust/pull/27825
5115 [dep]: https://github.com/rust-lang/rust/pull/28339
5116 [es]: https://github.com/rust-lang/rust/pull/27956
5117 [ext]: https://github.com/rust-lang/rust/pull/28094
5118 [faststr]: https://github.com/rust-lang/rust/pull/28338
5119 [ffi]: https://github.com/rust-lang/rust/pull/28779
5120 [fp]: https://github.com/rust-lang/rust/pull/28268
5121 [fp2]: https://github.com/rust-lang/rust/pull/28560
5122 [fp3]: https://github.com/rust-lang/rust/pull/27307
5123 [i]: https://github.com/rust-lang/rust/pull/27451
5124 [into2]: https://github.com/rust-lang/rust/pull/28039
5125 [it]: https://github.com/rust-lang/rust/pull/27652
5126 [mm]: https://github.com/rust-lang/rust/pull/27338
5127 [mutw]: https://github.com/rust-lang/rust/pull/28368
5128 [sound]: https://github.com/rust-lang/rust/pull/27641
5129 [p]: https://github.com/rust-lang/rust/pull/27866
5130 [pec]: https://github.com/rust-lang/rust/pull/28486
5131 [pr]: https://github.com/rust-lang/rust/pull/27896
5132 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5133 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5134 [s]: https://github.com/rust-lang/rust/pull/27474
5135 [stab]: https://github.com/rust-lang/rust/pull/28339
5136 [stat]: https://github.com/rust-lang/rust/pull/28321
5137 [vd]: https://github.com/rust-lang/rust/pull/28494
5139 Version 1.3.0 (2015-09-17)
5140 ==============================
5142 * ~900 changes, numerous bugfixes
5147 * The [new object lifetime defaults][nold] have been [turned
5148 on][nold2] after a cycle of warnings about the change. Now types
5149 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5150 being interpreted as `&'a Box<Trait+'a>` to `&'a
5151 Box<Trait+'static>`.
5152 * [The Rustonomicon][nom] is a new book in the official documentation
5153 that dives into writing unsafe Rust.
5154 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5155 timekeeping is employed by other std APIs, as well as out-of-tree
5161 * The [new object lifetime defaults][nold] have been [turned
5162 on][nold2] after a cycle of warnings about the change.
5163 * There is a known [regression][lr] in how object lifetime elision is
5164 interpreted, the proper solution for which is undetermined.
5165 * The `#[prelude_import]` attribute, an internal implementation
5166 detail, was accidentally stabilized previously. [It has been put
5167 behind the `prelude_import` feature gate][pi]. This change is
5168 believed to break no existing code.
5169 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5170 [more sane for dynamically sized types][dst3]. Code that relied on
5171 the previous behavior is thought to be broken.
5172 * The `dropck` rules, which checks that destructors can't access
5173 destroyed values, [have been updated][dropck] to match the
5174 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5175 cause some previously-compiling code to no longer build.
5180 * The [new object lifetime defaults][nold] have been [turned
5181 on][nold2] after a cycle of warnings about the change.
5182 * Semicolons may [now follow types and paths in
5183 macros](https://github.com/rust-lang/rust/pull/27000).
5184 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5185 [more sane for dynamically sized types][dst3]. Code that relied on
5186 the previous behavior is not known to exist, and suspected to be
5188 * `'static` variables [may now be recursive][st].
5189 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5190 implementations correctly.
5191 * The `dropck` rules, which checks that destructors can't access
5192 destroyed values, [have been updated][dropck] to match the
5198 * The [`Duration`] API, [has been stabilized][ds], as well as the
5199 `std::time` module, which presently contains only `Duration`.
5200 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5201 * The owned C string, [`CString`], implements [`Borrow`] and the
5202 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5203 these allow C strings to be borrowed and cloned in generic code.
5204 * [`CStr`] implements [`Debug`].
5205 * [`AtomicPtr`] implements [`Debug`].
5206 * [`Error`] trait objects [can be downcast to their concrete types][e]
5207 in many common configurations, using the [`is`], [`downcast`],
5208 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5210 * Searching for substrings now [employs the two-way algorithm][search]
5211 instead of doing a naive search. This gives major speedups to a
5212 number of methods, including [`contains`][sc], [`find`][sf],
5213 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5214 [`ends_with`][sew] are also faster.
5215 * The performance of `PartialEq` for slices is [much faster][ps].
5216 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5217 is overridden and optimized by the implementations for scalars.
5218 * The [`Hasher`] trait now has a number of specialized `write_*`
5219 methods for primitive types, for efficiency.
5220 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5221 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5222 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5223 of [`std::error::Error::cause`][iec] also delegates to the inner
5225 * [`process::Child`][pc] gained the [`id`] method, which returns a
5226 `u32` representing the platform-specific process identifier.
5227 * The [`connect`] method on slices is deprecated, replaced by the new
5228 [`join`] method (note that both of these are on the *unstable*
5229 [`SliceConcatExt`] trait, but through the magic of the prelude are
5230 available to stable code anyway).
5231 * The [`Div`] operator is implemented for [`Wrapping`] types.
5232 * [`DerefMut` is implemented for `String`][dms].
5233 * Performance of SipHash (the default hasher for `HashMap`) is
5234 [better for long data][sh].
5235 * [`AtomicPtr`] implements [`Send`].
5236 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5237 are now [specialized to use uninitialized buffers for increased
5239 * Lifetime parameters of foreign functions [are now resolved
5245 * Rust can now, with some coercion, [produce programs that run on
5246 Windows XP][xp], though XP is not considered a supported platform.
5247 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5248 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5249 recommended for use in 1.3, though should be fully-functional
5250 in the [64-bit 1.4 beta][b14].
5251 * On Fedora-based systems installation will [properly configure the
5252 dynamic linker][fl].
5253 * The compiler gained many new extended error descriptions, which can
5254 be accessed with the `--explain` flag.
5255 * The `dropck` pass, which checks that destructors can't access
5256 destroyed values, [has been rewritten][dropck]. This fixes some
5257 soundness holes, and as such will cause some previously-compiling
5258 code to no longer build.
5259 * `rustc` now uses [LLVM to write archive files where possible][ar].
5260 Eventually this will eliminate the compiler's dependency on the ar
5262 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5263 supported FreeBSD on x86_64).
5264 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5265 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5267 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5268 will kill the process instead of leaking][nlp].
5270 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5271 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5272 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5273 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5274 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5275 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5276 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5277 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5278 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5279 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5280 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5281 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5282 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5283 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5284 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5285 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5286 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5287 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5288 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5289 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5290 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5291 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5292 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5293 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5294 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5295 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5296 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5297 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5298 [ar]: https://github.com/rust-lang/rust/pull/26926
5299 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5300 [dms]: https://github.com/rust-lang/rust/pull/26241
5301 [dropck]: https://github.com/rust-lang/rust/pull/27261
5302 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5303 [ds]: https://github.com/rust-lang/rust/pull/26818
5304 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5305 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5306 [dst3]: https://github.com/rust-lang/rust/pull/27351
5307 [e]: https://github.com/rust-lang/rust/pull/24793
5308 [f]: https://github.com/rust-lang/rust/pull/26588
5309 [fb]: https://github.com/rust-lang/rust/pull/26959
5310 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5311 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5312 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5313 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5314 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5315 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5316 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5317 [lic]: https://github.com/rust-lang/rust/pull/26583
5318 [lnu]: https://github.com/rust-lang/rust/pull/27026
5319 [lr]: https://github.com/rust-lang/rust/issues/27248
5320 [lum]: https://github.com/rust-lang/rust/pull/26378
5321 [lur]: https://github.com/rust-lang/rust/pull/26783
5322 [nlp]: https://github.com/rust-lang/rust/pull/27176
5323 [nold2]: https://github.com/rust-lang/rust/pull/27045
5324 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5325 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5326 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5327 [pi]: https://github.com/rust-lang/rust/pull/26699
5328 [ps]: https://github.com/rust-lang/rust/pull/26884
5329 [rte]: https://github.com/rust-lang/rust/pull/26950
5330 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5331 [search]: https://github.com/rust-lang/rust/pull/26327
5332 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5333 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5334 [sh]: https://github.com/rust-lang/rust/pull/27280
5335 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5336 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5337 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5338 [st]: https://github.com/rust-lang/rust/pull/26630
5339 [win1]: https://github.com/rust-lang/rust/pull/26569
5340 [win2]: https://github.com/rust-lang/rust/pull/26741
5341 [win3]: https://github.com/rust-lang/rust/pull/26741
5342 [win4]: https://github.com/rust-lang/rust/pull/27210
5343 [xp]: https://github.com/rust-lang/rust/pull/26569
5345 Version 1.2.0 (2015-08-07)
5346 ==========================
5348 * ~1200 changes, numerous bugfixes
5353 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5354 like `Rc` to contain types without a fixed size, arrays and trait
5355 objects, finally enabling use of `Rc<[T]>` and completing the
5356 implementation of DST.
5357 * [Parallel codegen][parcodegen] is now working again, which can
5358 substantially speed up large builds in debug mode; It also gets
5359 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5360 jobs). It's not enabled by default, but will be "in the near
5361 future". It can be activated with the `-C codegen-units=N` flag to
5363 * This is the first release with [experimental support for linking
5364 with the MSVC linker and lib C on Windows (instead of using the GNU
5365 variants via MinGW)][win]. It is yet recommended only for the most
5366 intrepid Rustaceans.
5367 * Benchmark compilations are showing a 30% improvement in
5368 bootstrapping over 1.1.
5373 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5374 unicode case mapping, which is a previously-planned change in
5375 behavior and considered a bugfix.
5376 * [`mem::align_of`] now specifies [the *minimum alignment* for
5377 T][align], which is usually the alignment programs are interested
5378 in, and the same value reported by clang's
5379 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5381 * [The `#[packed]` attribute is no longer silently accepted by the
5382 compiler][packed]. This attribute did nothing and code that
5383 mentioned it likely did not work as intended.
5384 * Associated type defaults are [now behind the
5385 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5386 defaults *did not work*, but could be mentioned syntactically. As
5387 such this breakage has minimal impact.
5392 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5393 matching against dereferenceable values.
5398 * The [`Extend`] trait, which grows a collection from an iterator, is
5399 implemented over iterators of references, for `String`, `Vec`,
5400 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5401 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5402 * The [`iter::once`] function returns an iterator that yields a single
5403 element, and [`iter::empty`] returns an iterator that yields no
5405 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5406 over substring matches.
5407 * [`Cell`] and [`RefCell`] both implement `Eq`.
5408 * A number of methods for wrapping arithmetic are added to the
5409 integral types, [`wrapping_div`], [`wrapping_rem`],
5410 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5411 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5412 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5413 type.. It is illegal for the default arithmetic operations in Rust
5414 to overflow; the desire to wrap must be explicit.
5415 * The `{:#?}` formatting specifier [displays the alternate,
5416 pretty-printed][debugfmt] form of the `Debug` formatter. This
5417 feature was actually introduced prior to 1.0 with little
5419 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5420 for writing data to formatted strings, similar to [`io::Write`].
5421 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5422 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5423 are used by code generators to emit implementations of [`Debug`].
5424 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5425 methods that convert case, following Unicode case mapping.
5426 * It is now easier to handle poisoned locks. The [`PoisonError`]
5427 type, returned by failing lock operations, exposes `into_inner`,
5428 `get_ref`, and `get_mut`, which all give access to the inner lock
5429 guard, and allow the poisoned lock to continue to operate. The
5430 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5431 poisoned lock without attempting to take the lock.
5432 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5433 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5434 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5435 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5437 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5443 * `rustc` employs smarter heuristics for guessing at [typos].
5444 * `rustc` emits more efficient code for [no-op conversions between
5445 unsafe pointers][nop].
5446 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5447 resulting in faster compile times and smaller code.
5449 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5450 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5451 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5452 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5453 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5454 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5455 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5456 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5457 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5458 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5459 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5460 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5461 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5462 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5463 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5464 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5465 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5466 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5467 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5468 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5469 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5470 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5471 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5472 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5473 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5474 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5475 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5476 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5477 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5478 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5479 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5480 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5481 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5482 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5483 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5484 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5485 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5486 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5487 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5488 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5489 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5490 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5491 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5492 [align]: https://github.com/rust-lang/rust/pull/25646
5493 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5494 [typos]: https://github.com/rust-lang/rust/pull/26087
5495 [nop]: https://github.com/rust-lang/rust/pull/26336
5496 [fat]: https://github.com/rust-lang/rust/pull/26411
5497 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5498 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5499 [packed]: https://github.com/rust-lang/rust/pull/25541
5500 [ad]: https://github.com/rust-lang/rust/pull/27382
5501 [win]: https://github.com/rust-lang/rust/pull/25350
5503 Version 1.1.0 (2015-06-25)
5504 =========================
5506 * ~850 changes, numerous bugfixes
5511 * The [`std::fs` module has been expanded][fs] to expand the set of
5512 functionality exposed:
5513 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5514 don't incur a syscall on some platforms.
5515 * A `symlink_metadata` function has been added.
5516 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5517 access to all underlying information.
5518 * The compiler now contains extended explanations of many errors. When an error
5519 with an explanation occurs the compiler suggests using the `--explain` flag
5520 to read the explanation. Error explanations are also [available online][err-index].
5521 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5522 well as other work, the time to bootstrap the compiler decreased by
5528 * The [`str::split_whitespace`] method splits a string on unicode
5529 whitespace boundaries.
5530 * On both Windows and Unix, new extension traits provide conversion of
5531 I/O types to and from the underlying system handles. On Unix, these
5532 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5533 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5534 `TcpListener`, and `UpdSocket`. Further implementations for
5535 `std::process` will be stabilized later.
5536 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5537 Windows, symlinks can be created with
5538 `std::os::windows::symlink_dir` and
5539 `std::os::windows::symlink_file`.
5540 * The `mpsc::Receiver` type can now be converted into an iterator with
5541 `into_iter` on the [`IntoIterator`] trait.
5542 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5543 implementation of the [`From`] trait.
5544 * The `Debug` implementation for `RangeFull` [creates output that is
5545 more consistent with other implementations][rf].
5546 * [`Debug` is implemented for `File`][file].
5547 * The `Default` implementation for `Arc` [no longer requires `Sync +
5549 * [The `Iterator` methods `count`, `nth`, and `last` have been
5550 overridden for slices to have O(1) performance instead of O(n)][si].
5551 * Incorrect handling of paths on Windows has been improved in both the
5552 compiler and the standard library.
5553 * [`AtomicPtr` gained a `Default` implementation][ap].
5554 * In accordance with Rust's policy on arithmetic overflow `abs` now
5555 [panics on overflow when debug assertions are enabled][abs].
5556 * The [`Cloned`] iterator, which was accidentally left unstable for
5557 1.0 [has been stabilized][c].
5558 * The [`Incoming`] iterator, which iterates over incoming TCP
5559 connections, and which was accidentally unnamable in 1.0, [is now
5560 properly exported][inc].
5561 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5562 `sift_up` or `sift_down` panic][bh].
5563 * The [`split_off`] method of `LinkedList` [no longer corrupts
5564 the list in certain scenarios][ll].
5569 * Type checking performance [has improved notably][sk] with
5570 [multiple improvements][pre].
5571 * The compiler [suggests code changes][ch] for more errors.
5572 * rustc and it's build system have experimental support for [building
5573 toolchains against MUSL][m] instead of glibc on Linux.
5574 * The compiler defines the `target_env` cfg value, which is used for
5575 distinguishing toolchains that are otherwise for the same
5576 platform. Presently this is set to `gnu` for common GNU Linux
5577 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5578 * The [`cargo rustc`][crc] command invokes a build with custom flags
5580 * [Android executables are always position independent][pie].
5581 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5584 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5585 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5586 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5587 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5588 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5589 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5590 [rf]: https://github.com/rust-lang/rust/pull/24491
5591 [err-index]: https://doc.rust-lang.org/error-index.html
5592 [sk]: https://github.com/rust-lang/rust/pull/24615
5593 [pre]: https://github.com/rust-lang/rust/pull/25323
5594 [file]: https://github.com/rust-lang/rust/pull/24598
5595 [ch]: https://github.com/rust-lang/rust/pull/24683
5596 [arc]: https://github.com/rust-lang/rust/pull/24695
5597 [si]: https://github.com/rust-lang/rust/pull/24701
5598 [ap]: https://github.com/rust-lang/rust/pull/24834
5599 [m]: https://github.com/rust-lang/rust/pull/24777
5600 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5601 [crc]: https://github.com/rust-lang/cargo/pull/1568
5602 [pie]: https://github.com/rust-lang/rust/pull/24953
5603 [abs]: https://github.com/rust-lang/rust/pull/25441
5604 [c]: https://github.com/rust-lang/rust/pull/25496
5605 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5606 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5607 [inc]: https://github.com/rust-lang/rust/pull/25522
5608 [bh]: https://github.com/rust-lang/rust/pull/25856
5609 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5610 [ll]: https://github.com/rust-lang/rust/pull/26022
5611 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5612 [drop]: https://github.com/rust-lang/rust/pull/24935
5614 Version 1.0.0 (2015-05-15)
5615 ========================
5617 * ~1500 changes, numerous bugfixes
5622 * The vast majority of the standard library is now `#[stable]`. It is
5623 no longer possible to use unstable features with a stable build of
5625 * Many popular crates on [crates.io] now work on the stable release
5627 * Arithmetic on basic integer types now [checks for overflow in debug
5633 * Several [restrictions have been added to trait coherence][coh] in
5634 order to make it easier for upstream authors to change traits
5635 without breaking downstream code.
5636 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5637 improve error messages and macro behavior. For example, `0b1234` is
5638 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5639 * Trait bounds [are always invariant][inv], eliminating the need for
5640 the `PhantomFn` and `MarkerTrait` lang items, which have been
5642 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5643 "foo" as bar` syntax has been replaced with `extern crate foo as
5644 bar`, and Cargo now automatically translates "-" in *package* names
5645 to underscore for the crate name.
5646 * [Lifetime shadowing is an error][lt].
5647 * [`Send` no longer implies `'static`][send-rfc].
5648 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5649 `MyType::default()`.
5650 * Primitive types [now have inherent methods][prim-inherent],
5651 obviating the need for extension traits like `SliceExt`.
5652 * Methods with `Self: Sized` in their `where` clause are [considered
5653 object-safe][self-sized], allowing many extension traits like
5654 `IteratorExt` to be merged into the traits they extended.
5655 * You can now [refer to associated types][assoc-where] whose
5656 corresponding trait bounds appear only in a `where` clause.
5657 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5658 like `Send` and `Sync` are now library-defined.
5659 * A [Reflect trait][reflect] was introduced, which means that
5660 downcasting via the `Any` trait is effectively limited to concrete
5661 types. This helps retain the potentially-important "parametricity"
5662 property: generic code cannot behave differently for different type
5663 arguments except in minor ways.
5664 * The `unsafe_destructor` feature is now deprecated in favor of the
5665 [new `dropck`][dropck]. This change is a major reduction in unsafe
5671 * The `thread_local` module [has been renamed to `std::thread`][th].
5672 * The methods of `IteratorExt` [have been moved to the `Iterator`
5674 * Several traits that implement Rust's conventions for type
5675 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5676 [centralized in the `std::convert` module][con].
5677 * The `FromError` trait [was removed in favor of `From`][fe].
5678 * The basic sleep function [has moved to
5679 `std::thread::sleep_ms`][slp].
5680 * The `splitn` function now takes an `n` parameter that represents the
5681 number of items yielded by the returned iterator [instead of the
5682 number of 'splits'][spl].
5683 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5684 * [Derived implementations of `PartialOrd` now order enums according
5685 to their explicitly-assigned discriminants][po].
5686 * [Methods for searching strings are generic over `Pattern`s][pat],
5687 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5689 * [In method resolution, object methods are resolved before inherent
5691 * [`String::from_str` has been deprecated in favor of the `From` impl,
5692 `String::from`][sf].
5693 * [`io::Error` implements `Sync`][ios].
5694 * [The `words` method on `&str` has been replaced with
5695 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5697 * The new path and IO modules are complete and `#[stable]`. This
5698 was the major library focus for this cycle.
5699 * The path API was [revised][path-normalize] to normalize `.`,
5700 adjusting the tradeoffs in favor of the most common usage.
5701 * A large number of remaining APIs in `std` were also stabilized
5702 during this cycle; about 75% of the non-deprecated API surface
5704 * The new [string pattern API][string-pattern] landed, which makes
5705 the string slice API much more internally consistent and flexible.
5706 * A new set of [generic conversion traits][conversion] replaced
5707 many existing ad hoc traits.
5708 * Generic numeric traits were [completely removed][num-traits]. This
5709 was made possible thanks to inherent methods for primitive types,
5710 and the removal gives maximal flexibility for designing a numeric
5711 hierarchy in the future.
5712 * The `Fn` traits are now related via [inheritance][fn-inherit]
5713 and provide ergonomic [blanket implementations][fn-blanket].
5714 * The `Index` and `IndexMut` traits were changed to
5715 [take the index by value][index-value], enabling code like
5716 `hash_map["string"]` to work.
5717 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5718 `Copy` data is known to be `Clone` as well.
5723 * Many errors now have extended explanations that can be accessed with
5724 the `--explain` flag to `rustc`.
5725 * Many new examples have been added to the standard library
5727 * rustdoc has received a number of improvements focused on completion
5729 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5730 * Much headway was made on ecosystem-wide CI, making it possible
5731 to [compare builds for breakage][ci-compare].
5734 [crates.io]: http://crates.io
5735 [clo]: https://github.com/rust-lang/rust/pull/24034
5736 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5737 [con]: https://github.com/rust-lang/rust/pull/23875
5738 [cr]: https://github.com/rust-lang/rust/pull/23419
5739 [fe]: https://github.com/rust-lang/rust/pull/23879
5740 [ie]: https://github.com/rust-lang/rust/pull/23300
5741 [inv]: https://github.com/rust-lang/rust/pull/23938
5742 [ios]: https://github.com/rust-lang/rust/pull/24133
5743 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5744 [lt]: https://github.com/rust-lang/rust/pull/24057
5745 [meth]: https://github.com/rust-lang/rust/pull/24056
5746 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5747 [po]: https://github.com/rust-lang/rust/pull/24270
5748 [sf]: https://github.com/rust-lang/rust/pull/24517
5749 [slp]: https://github.com/rust-lang/rust/pull/23949
5750 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5751 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5752 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5753 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5754 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5755 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5756 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5757 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5758 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5759 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5760 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5761 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5762 [reflect]: https://github.com/rust-lang/rust/pull/23712
5763 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5764 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5765 [index-value]: https://github.com/rust-lang/rust/pull/23601
5766 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5767 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5768 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5769 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5770 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5771 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5774 Version 1.0.0-alpha.2 (2015-02-20)
5775 =====================================
5777 * ~1300 changes, numerous bugfixes
5781 * The various I/O modules were [overhauled][io-rfc] to reduce
5782 unnecessary abstractions and provide better interoperation with
5783 the underlying platform. The old `io` module remains temporarily
5785 * The standard library now [participates in feature gating][feat],
5786 so use of unstable libraries now requires a `#![feature(...)]`
5787 attribute. The impact of this change is [described on the
5788 forum][feat-forum]. [RFC][feat-rfc].
5792 * `for` loops [now operate on the `IntoIterator` trait][into],
5793 which eliminates the need to call `.iter()`, etc. to iterate
5794 over collections. There are some new subtleties to remember
5795 though regarding what sort of iterators various types yield, in
5796 particular that `for foo in bar { }` yields values from a move
5797 iterator, destroying the original collection. [RFC][into-rfc].
5798 * Objects now have [default lifetime bounds][obj], so you don't
5799 have to write `Box<Trait+'static>` when you don't care about
5800 storing references. [RFC][obj-rfc].
5801 * In types that implement `Drop`, [lifetimes must outlive the
5802 value][drop]. This will soon make it possible to safely
5803 implement `Drop` for types where `#[unsafe_destructor]` is now
5804 required. Read the [gorgeous RFC][drop-rfc] for details.
5805 * The fully qualified <T as Trait>::X syntax lets you set the Self
5806 type for a trait method or associated type. [RFC][ufcs-rfc].
5807 * References to types that implement `Deref<U>` now [automatically
5808 coerce to references][deref] to the dereferenced type `U`,
5809 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5810 should eliminate many unsightly uses of `&*`, as when converting
5811 from references to vectors into references to
5812 slices. [RFC][deref-rfc].
5813 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5814 `|:|`) is obsolete and closure kind is inferred from context.
5815 * [`Self` is a keyword][Self].
5819 * The `Show` and `String` formatting traits [have been
5820 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5821 their related purposes. Automatically getting a string
5822 conversion to use with `format!("{:?}", something_to_debug)` is
5823 now written `#[derive(Debug)]`.
5824 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5825 OsStr}`, provide strings in platform-specific encodings for easier
5826 interop with system APIs. [RFC][osstr-rfc].
5827 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5828 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5829 creating raw pointers.
5833 * Certain long error messages of the form 'expected foo found bar'
5834 are now [split neatly across multiple
5835 lines][multiline]. Examples in the PR.
5836 * On Unix Rust can be [uninstalled][un] by running
5837 `/usr/local/lib/rustlib/uninstall.sh`.
5838 * The `#[rustc_on_unimplemented]` attribute, requiring the
5839 'on_unimplemented' feature, lets rustc [display custom error
5840 messages when a trait is expected to be implemented for a type
5845 * Rust is tested against a [LALR grammar][lalr], which parses
5846 almost all the Rust files that rustc does.
5848 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5849 [close]: https://github.com/rust-lang/rust/pull/21843
5850 [deref]: https://github.com/rust-lang/rust/pull/21351
5851 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5852 [drop]: https://github.com/rust-lang/rust/pull/21972
5853 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5854 [feat]: https://github.com/rust-lang/rust/pull/21248
5855 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5856 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5857 [fmt]: https://github.com/rust-lang/rust/pull/21457
5858 [into]: https://github.com/rust-lang/rust/pull/20790
5859 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5860 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5861 [lalr]: https://github.com/rust-lang/rust/pull/21452
5862 [multiline]: https://github.com/rust-lang/rust/pull/19870
5863 [obj]: https://github.com/rust-lang/rust/pull/22230
5864 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5865 [onun]: https://github.com/rust-lang/rust/pull/20889
5866 [osstr]: https://github.com/rust-lang/rust/pull/21488
5867 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5868 [Self]: https://github.com/rust-lang/rust/pull/22158
5869 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5870 [un]: https://github.com/rust-lang/rust/pull/22256
5873 Version 1.0.0-alpha (2015-01-09)
5874 ==================================
5876 * ~2400 changes, numerous bugfixes
5880 * The language itself is considered feature complete for 1.0,
5881 though there will be many usability improvements and bugfixes
5882 before the final release.
5883 * Nearly 50% of the public API surface of the standard library has
5884 been declared 'stable'. Those interfaces are unlikely to change
5886 * The long-running debate over integer types has been
5887 [settled][ints]: Rust will ship with types named `isize` and
5888 `usize`, rather than `int` and `uint`, for pointer-sized
5889 integers. Guidelines will be rolled out during the alpha cycle.
5890 * Most crates that are not `std` have been moved out of the Rust
5891 distribution into the Cargo ecosystem so they can evolve
5892 separately and don't need to be stabilized as quickly, including
5893 'time', 'getopts', 'num', 'regex', and 'term'.
5894 * Documentation continues to be expanded with more API coverage, more
5895 examples, and more in-depth explanations. The guides have been
5896 consolidated into [The Rust Programming Language][trpl].
5897 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5898 * All official Rust binary installers now come with [Cargo], the
5899 Rust package manager.
5903 * Closures have been [completely redesigned][unboxed] to be
5904 implemented in terms of traits, can now be used as generic type
5905 bounds and thus monomorphized and inlined, or via an opaque
5906 pointer (boxed) as in the old system. The new system is often
5907 referred to as 'unboxed' closures.
5908 * Traits now support [associated types][assoc], allowing families
5909 of related types to be defined together and used generically in
5911 * Enum variants are [namespaced by their type names][enum].
5912 * [`where` clauses][where] provide a more versatile and attractive
5913 syntax for specifying generic bounds, though the previous syntax
5915 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5917 * Rust [no longer has a runtime][rt] of any description, and only
5918 supports OS threads, not green threads.
5919 * At long last, Rust has been overhauled for 'dynamically-sized
5920 types' ([DST]), which integrates 'fat pointers' (object types,
5921 arrays, and `str`) more deeply into the type system, making it
5923 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5924 `..j` that produce range types and which, when combined with the
5925 `Index` operator and multidispatch, leads to a convenient slice
5927 * The new range syntax revealed an ambiguity in the fixed-length
5928 array syntax, so now fixed length arrays [are written `[T;
5930 * The `Copy` trait is no longer implemented automatically. Unsafe
5931 pointers no longer implement `Sync` and `Send` so types
5932 containing them don't automatically either. `Sync` and `Send`
5933 are now 'unsafe traits' so one can "forcibly" implement them via
5934 `unsafe impl` if a type confirms to the requirements for them
5935 even though the internals do not (e.g. structs containing unsafe
5936 pointers like `Arc`). These changes are intended to prevent some
5937 footguns and are collectively known as [opt-in built-in
5938 traits][oibit] (though `Sync` and `Send` will soon become pure
5939 library types unknown to the compiler).
5940 * Operator traits now take their operands [by value][ops], and
5941 comparison traits can use multidispatch to compare one type
5942 against multiple other types, allowing e.g. `String` to be
5943 compared with `&str`.
5944 * `if let` and `while let` are no longer feature-gated.
5945 * Rust has adopted a more [uniform syntax for escaping unicode
5946 characters][unicode].
5947 * `macro_rules!` [has been declared stable][mac]. Though it is a
5948 flawed system it is sufficiently popular that it must be usable
5949 for 1.0. Effort has gone into [future-proofing][mac-future] it
5950 in ways that will allow other macro systems to be developed in
5951 parallel, and won't otherwise impact the evolution of the
5953 * The prelude has been [pared back significantly][prelude] such
5954 that it is the minimum necessary to support the most pervasive
5955 code patterns, and through [generalized where clauses][where]
5956 many of the prelude extension traits have been consolidated.
5957 * Rust's rudimentary reflection [has been removed][refl], as it
5958 incurred too much code generation for little benefit.
5959 * [Struct variants][structvars] are no longer feature-gated.
5960 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5961 known as 'higher-ranked trait bounds', this crucially allows
5962 unboxed closures to work.
5963 * Macros invocations surrounded by parens or square brackets and
5964 not terminated by a semicolon are [parsed as
5965 expressions][macros], which makes expressions like `vec![1i32,
5966 2, 3].len()` work as expected.
5967 * Trait objects now implement their traits automatically, and
5968 traits that can be coerced to objects now must be [object
5970 * Automatically deriving traits is now done with `#[derive(...)]`
5971 not `#[deriving(...)]` for [consistency with other naming
5972 conventions][derive].
5973 * Importing the containing module or enum at the same time as
5974 items or variants they contain is [now done with `self` instead
5975 of `mod`][self], as in use `foo::{self, bar}`
5976 * Glob imports are no longer feature-gated.
5977 * The `box` operator and `box` patterns have been feature-gated
5978 pending a redesign. For now unique boxes should be allocated
5979 like other containers, with `Box::new`.
5983 * A [series][coll1] of [efforts][coll2] to establish
5984 [conventions][coll3] for collections types has resulted in API
5985 improvements throughout the standard library.
5986 * New [APIs for error handling][err] provide ergonomic interop
5987 between error types, and [new conventions][err-conv] describe
5988 more clearly the recommended error handling strategies in Rust.
5989 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5990 it is easier to discuss failure in the context of error handling
5991 without making clarifications as to whether you are referring to
5992 the 'fail' macro or failure more generally.
5993 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5994 syscall when available.
5995 * The 'serialize' crate has been renamed 'rustc-serialize' and
5996 moved out of the distribution to Cargo. Although it is widely
5997 used now, it is expected to be superseded in the near future.
5998 * The `Show` formatter, typically implemented with
5999 `#[derive(Show)]` is [now requested with the `{:?}`
6000 specifier][show] and is intended for use by all types, for uses
6001 such as `println!` debugging. The new `String` formatter must be
6002 implemented by hand, uses the `{}` specifier, and is intended
6003 for full-fidelity conversions of things that can logically be
6004 represented as strings.
6008 * [Flexible target specification][flex] allows rustc's code
6009 generation to be configured to support otherwise-unsupported
6011 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6012 respective debuggers with Rust-appropriate pretty-printing.
6013 * The Windows installation of Rust is distributed with the
6014 MinGW components currently required to link binaries on that
6019 * Nullable enum optimizations have been extended to more types so
6020 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6021 space than the inner types themselves.
6022 * Work has begun on supporting AArch64.
6024 [Cargo]: https://crates.io
6025 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6026 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6027 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6028 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6029 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6030 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6031 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6032 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6033 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6034 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6035 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6036 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6037 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6038 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6039 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6040 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6041 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6042 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6043 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6044 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6045 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6046 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6047 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6048 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6049 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6050 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6051 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6052 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6053 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6054 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6055 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6056 [trpl]: https://doc.rust-lang.org/book/index.html
6057 [rbe]: http://rustbyexample.com/
6060 Version 0.12.0 (2014-10-09)
6061 =============================
6063 * ~1900 changes, numerous bugfixes
6067 * The introductory documentation (now called The Rust Guide) has
6068 been completely rewritten, as have a number of supplementary
6070 * Rust's package manager, Cargo, continues to improve and is
6071 sometimes considered to be quite awesome.
6072 * Many API's in `std` have been reviewed and updated for
6073 consistency with the in-development Rust coding
6074 guidelines. The standard library documentation tracks
6075 stabilization progress.
6076 * Minor libraries have been moved out-of-tree to the rust-lang org
6077 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6078 be installed with Cargo.
6079 * Lifetime elision allows lifetime annotations to be left off of
6080 function declarations in many common scenarios.
6081 * Rust now works on 64-bit Windows.
6084 * Indexing can be overloaded with the `Index` and `IndexMut`
6086 * The `if let` construct takes a branch only if the `let` pattern
6087 matches, currently behind the 'if_let' feature gate.
6088 * 'where clauses', a more flexible syntax for specifying trait
6089 bounds that is more aesthetic, have been added for traits and
6090 free functions. Where clauses will in the future make it
6091 possible to constrain associated types, which would be
6092 impossible with the existing syntax.
6093 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6094 the 'slicing_syntax' feature gate, and can be overloaded with
6095 the `Slice` or `SliceMut` traits.
6096 * The syntax for matching of sub-slices has been changed to use a
6097 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6098 consistency with other uses of `..` and to future-proof
6099 potential additional uses of the syntax.
6100 * The syntax for matching inclusive ranges in patterns has changed
6101 from `0..3` to `0...4` to be consistent with the exclusive range
6103 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6104 c]`) has been put behind the 'advanced_slice_patterns' feature
6105 gate and may be removed in the future.
6106 * Components of tuples and tuple structs can be extracted using
6107 the `value.0` syntax, currently behind the `tuple_indexing`
6109 * The `#[crate_id]` attribute is no longer supported; versioning
6110 is handled by the package manager.
6111 * Renaming crate imports are now written `extern crate foo as bar`
6112 instead of `extern crate bar = foo`.
6113 * Renaming use statements are now written `use foo as bar` instead
6115 * `let` and `match` bindings and argument names in macros are now
6117 * The new, more efficient, closure types ('unboxed closures') have
6118 been added under a feature gate, 'unboxed_closures'. These will
6119 soon replace the existing closure types, once higher-ranked
6120 trait lifetimes are added to the language.
6121 * `move` has been added as a keyword, for indicating closures
6122 that capture by value.
6123 * Mutation and assignment is no longer allowed in pattern guards.
6124 * Generic structs and enums can now have trait bounds.
6125 * The `Share` trait is now called `Sync` to free up the term
6126 'shared' to refer to 'shared reference' (the default reference
6128 * Dynamically-sized types have been mostly implemented,
6129 unifying the behavior of fat-pointer types with the rest of the
6131 * As part of dynamically-sized types, the `Sized` trait has been
6132 introduced, which qualifying types implement by default, and
6133 which type parameters expect by default. To specify that a type
6134 parameter does not need to be sized, write `<Sized? T>`. Most
6135 types are `Sized`, notable exceptions being unsized arrays
6136 (`[T]`) and trait types.
6137 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6138 * Lifetime bounds can now be applied to type parameters and object
6140 * The old, reference counted GC type, `Gc<T>` which was once
6141 denoted by the `@` sigil, has finally been removed. GC will be
6142 revisited in the future.
6145 * Library documentation has been improved for a number of modules.
6146 * Bit-vectors, collections::bitv has been modernized.
6147 * The url crate is deprecated in favor of
6148 http://github.com/servo/rust-url, which can be installed with
6150 * Most I/O stream types can be cloned and subsequently closed from
6152 * A `std::time::Duration` type has been added for use in I/O
6153 methods that rely on timers, as well as in the 'time' crate's
6154 `Timespec` arithmetic.
6155 * The runtime I/O abstraction layer that enabled the green thread
6156 scheduler to do non-thread-blocking I/O has been removed, along
6157 with the libuv-based implementation employed by the green thread
6158 scheduler. This will greatly simplify the future I/O work.
6159 * `collections::btree` has been rewritten to have a more
6160 idiomatic and efficient design.
6163 * rustdoc output now indicates the stability levels of API's.
6164 * The `--crate-name` flag can specify the name of the crate
6165 being compiled, like `#[crate_name]`.
6166 * The `-C metadata` specifies additional metadata to hash into
6167 symbol names, and `-C extra-filename` specifies additional
6168 information to put into the output filename, for use by the
6169 package manager for versioning.
6170 * debug info generation has continued to improve and should be
6171 more reliable under both gdb and lldb.
6172 * rustc has experimental support for compiling in parallel
6173 using the `-C codegen-units` flag.
6174 * rustc no longer encodes rpath information into binaries by
6178 * Stack usage has been optimized with LLVM lifetime annotations.
6179 * Official Rust binaries on Linux are more compatible with older
6180 kernels and distributions, built on CentOS 5.10.
6183 Version 0.11.0 (2014-07-02)
6184 ==========================
6186 * ~1700 changes, numerous bugfixes
6189 * ~[T] has been removed from the language. This type is superseded by
6191 * ~str has been removed from the language. This type is superseded by
6193 * ~T has been removed from the language. This type is superseded by the
6195 * @T has been removed from the language. This type is superseded by the
6196 standard library's std::gc::Gc<T> type.
6197 * Struct fields are now all private by default.
6198 * Vector indices and shift amounts are both required to be a `uint`
6199 instead of any integral type.
6200 * Byte character, byte string, and raw byte string literals are now all
6201 supported by prefixing the normal literal with a `b`.
6202 * Multiple ABIs are no longer allowed in an ABI string
6203 * The syntax for lifetimes on closures/procedures has been tweaked
6204 slightly: `<'a>|A, B|: 'b + K -> T`
6205 * Floating point modulus has been removed from the language; however it
6206 is still provided by a library implementation.
6207 * Private enum variants are now disallowed.
6208 * The `priv` keyword has been removed from the language.
6209 * A closure can no longer be invoked through a &-pointer.
6210 * The `use foo, bar, baz;` syntax has been removed from the language.
6211 * The transmute intrinsic no longer works on type parameters.
6212 * Statics now allow blocks/items in their definition.
6213 * Trait bounds are separated from objects with + instead of : now.
6214 * Objects can no longer be read while they are mutably borrowed.
6215 * The address of a static is now marked as insignificant unless the
6216 #[inline(never)] attribute is placed it.
6217 * The #[unsafe_destructor] attribute is now behind a feature gate.
6218 * Struct literals are no longer allowed in ambiguous positions such as
6219 if, while, match, and for..in.
6220 * Declaration of lang items and intrinsics are now feature-gated by
6222 * Integral literals no longer default to `int`, and floating point
6223 literals no longer default to `f64`. Literals must be suffixed with an
6224 appropriate type if inference cannot determine the type of the
6226 * The Box<T> type is no longer implicitly borrowed to &mut T.
6227 * Procedures are now required to not capture borrowed references.
6230 * The standard library is now a "facade" over a number of underlying
6231 libraries. This means that development on the standard library should
6232 be speedier due to smaller crates, as well as a clearer line between
6234 * A new library, libcore, lives under the standard library's facade
6235 which is Rust's "0-assumption" library, suitable for embedded and
6236 kernel development for example.
6237 * A regex crate has been added to the standard distribution. This crate
6238 includes statically compiled regular expressions.
6239 * The unwrap/unwrap_err methods on Result require a Show bound for
6240 better error messages.
6241 * The return types of the std::comm primitives have been centralized
6242 around the Result type.
6243 * A number of I/O primitives have gained the ability to time out their
6245 * A number of I/O primitives have gained the ability to close their
6246 reading/writing halves to cancel pending operations.
6247 * Reverse iterator methods have been removed in favor of `rev()` on
6248 their forward-iteration counterparts.
6249 * A bitflags! macro has been added to enable easy interop with C and
6250 management of bit flags.
6251 * A debug_assert! macro is now provided which is disabled when
6252 `--cfg ndebug` is passed to the compiler.
6253 * A graphviz crate has been added for creating .dot files.
6254 * The std::cast module has been migrated into std::mem.
6255 * The std::local_data api has been migrated from freestanding functions
6256 to being based on methods.
6257 * The Pod trait has been renamed to Copy.
6258 * jemalloc has been added as the default allocator for types.
6259 * The API for allocating memory has been changed to use proper alignment
6260 and sized deallocation
6261 * Connecting a TcpStream or binding a TcpListener is now based on a
6262 string address and a u16 port. This allows connecting to a hostname as
6264 * The Reader trait now contains a core method, read_at_least(), which
6265 correctly handles many repeated 0-length reads.
6266 * The process-spawning API is now centered around a builder-style
6268 * The :? printing qualifier has been moved from the standard library to
6269 an external libdebug crate.
6270 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6271 have been renamed to Eq/Ord.
6272 * The select/plural methods have been removed from format!. The escapes
6273 for { and } have also changed from \{ and \} to {{ and }},
6275 * The TaskBuilder API has been re-worked to be a true builder, and
6276 extension traits for spawning native/green tasks have been added.
6279 * All breaking changes to the language or libraries now have their
6280 commit message annotated with `[breaking-change]` to allow for easy
6281 discovery of breaking changes.
6282 * The compiler will now try to suggest how to annotate lifetimes if a
6283 lifetime-related error occurs.
6284 * Debug info continues to be improved greatly with general bug fixes and
6285 better support for situations like link time optimization (LTO).
6286 * Usage of syntax extensions when cross-compiling has been fixed.
6287 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6288 -fdata-sections and --gc-sections has been enabled by default
6289 * The compiler is now stricter about where it will load module files
6290 from when a module is declared via `mod foo;`.
6291 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6292 Syntax extensions are now discovered via a "plugin registrar" type
6293 which will be extended in the future to other various plugins.
6294 * Lints have been restructured to allow for dynamically loadable lints.
6295 * A number of rustdoc improvements:
6296 * The HTML output has been visually redesigned.
6297 * Markdown is now powered by hoedown instead of sundown.
6298 * Searching heuristics have been greatly improved.
6299 * The search index has been reduced in size by a great amount.
6300 * Cross-crate documentation via `pub use` has been greatly improved.
6301 * Primitive types are now hyperlinked and documented.
6302 * Documentation has been moved from static.rust-lang.org/doc to
6304 * A new sandbox, play.rust-lang.org, is available for running and
6305 sharing rust code examples on-line.
6306 * Unused attributes are now more robustly warned about.
6307 * The dead_code lint now warns about unused struct fields.
6308 * Cross-compiling to iOS is now supported.
6309 * Cross-compiling to mipsel is now supported.
6310 * Stability attributes are now inherited by default and no longer apply
6311 to intra-crate usage, only inter-crate usage.
6312 * Error message related to non-exhaustive match expressions have been
6316 Version 0.10 (2014-04-03)
6317 =========================
6319 * ~1500 changes, numerous bugfixes
6322 * A new RFC process is now in place for modifying the language.
6323 * Patterns with `@`-pointers have been removed from the language.
6324 * Patterns with unique vectors (`~[T]`) have been removed from the
6326 * Patterns with unique strings (`~str`) have been removed from the
6328 * `@str` has been removed from the language.
6329 * `@[T]` has been removed from the language.
6330 * `@self` has been removed from the language.
6331 * `@Trait` has been removed from the language.
6332 * Headers on `~` allocations which contain `@` boxes inside the type for
6333 reference counting have been removed.
6334 * The semantics around the lifetimes of temporary expressions have changed,
6335 see #3511 and #11585 for more information.
6336 * Cross-crate syntax extensions are now possible, but feature gated. See
6337 #11151 for more information. This includes both `macro_rules!` macros as
6338 well as syntax extensions such as `format!`.
6339 * New lint modes have been added, and older ones have been turned on to be
6341 * Unnecessary parentheses
6344 * Uppercase variables
6345 * Publicly visible private types
6346 * `#[deriving]` with raw pointers
6347 * Unsafe functions can no longer be coerced to closures.
6348 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6349 * The `#[simd]` attribute is now behind a feature gate.
6350 * Visibility is no longer allowed on `extern crate` statements, and
6351 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6352 * Trailing commas are now allowed in argument lists and tuple patterns.
6353 * The `do` keyword has been removed, it is now a reserved keyword.
6354 * Default type parameters have been implemented, but are feature gated.
6355 * Borrowed variables through captures in closures are now considered soundly.
6356 * `extern mod` is now `extern crate`
6357 * The `Freeze` trait has been removed.
6358 * The `Share` trait has been added for types that can be shared among
6360 * Labels in macros are now hygienic.
6361 * Expression/statement macro invocations can be delimited with `{}` now.
6362 * Treatment of types allowed in `static mut` locations has been tweaked.
6363 * The `*` and `.` operators are now overloadable through the `Deref` and
6365 * `~Trait` and `proc` no longer have `Send` bounds by default.
6366 * Partial type hints are now supported with the `_` type marker.
6367 * An `Unsafe` type was introduced for interior mutability. It is now
6368 considered undefined to transmute from `&T` to `&mut T` without using the
6370 * The #[linkage] attribute was implemented for extern statics/functions.
6371 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6372 * `Pod` was renamed to `Copy`.
6375 * The `libextra` library has been removed. It has now been decomposed into
6376 component libraries with smaller and more focused nuggets of
6377 functionality. The full list of libraries can be found on the
6378 documentation index page.
6379 * std: `std::condition` has been removed. All I/O errors are now propagated
6380 through the `Result` type. In order to assist with error handling, a
6381 `try!` macro for unwrapping errors with an early return and a lint for
6382 unused results has been added. See #12039 for more information.
6383 * std: The `vec` module has been renamed to `slice`.
6384 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6385 This will become the only growable vector in the future.
6386 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6387 are now found at `std::io::BufferedReader` instead of
6388 `std::io::buffered::BufferedReader`.
6389 * std: `print` and `println` are no longer in the prelude, the `print!` and
6390 `println!` macros are intended to be used instead.
6391 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6392 attempts to statically prevent cycles.
6393 * std: The standard distribution is adopting the policy of pushing failure
6394 to the user rather than failing in libraries. Many functions (such as
6395 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6396 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6397 deriving mode: `#[deriving(Show)]`.
6398 * std: `ToStr` is now implemented for all types implementing `Show`.
6399 * std: The formatting trait methods now take `&self` instead of `&T`
6400 * std: The `invert()` method on iterators has been renamed to `rev()`
6401 * std: `std::num` has seen a reduction in the genericity of its traits,
6402 consolidating functionality into a few core traits.
6403 * std: Backtraces are now printed on task failure if the environment
6404 variable `RUST_BACKTRACE` is present.
6405 * std: Naming conventions for iterators have been standardized. More details
6406 can be found on the wiki's style guide.
6407 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6408 still implement the function.
6409 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6410 * std: `assert_approx_eq!` has been removed
6411 * std: The `e` and `E` formatting specifiers for floats have been added to
6412 print them in exponential notation.
6413 * std: The `Times` trait has been removed
6414 * std: Indications of variance and opting out of builtin bounds is done
6415 through marker types in `std::kinds::marker` now
6416 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6417 `#[deriving(Hash)]` is now possible.
6418 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6419 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6420 * std: `Chan::new` is now `channel()`.
6421 * std: A new synchronous channel type has been implemented.
6422 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6423 * std: `hashmap` and `trie` have been moved to `libcollections`
6424 * std: `run` has been rolled into `io::process`
6425 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6426 * std: The equality and comparison traits have seen some reorganization.
6427 * std: `rand` has moved to `librand`.
6428 * std: `to_{lower,upper}case` has been implemented for `char`.
6429 * std: Logging has been moved to `liblog`.
6430 * collections: `HashMap` has been rewritten for higher performance and less
6432 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6433 it can be booted manually. The runtime guide has more information and
6435 * native: All I/O functionality except signals has been implemented.
6436 * green: Task spawning with `libgreen` has been optimized with stack caching
6437 and various trimming of code.
6438 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6439 * sync: The `extra::sync` module has been updated to modern rust (and moved
6440 to the `sync` library), tweaking and improving various interfaces while
6441 dropping redundant functionality.
6442 * sync: A new `Barrier` type has been added to the `sync` library.
6443 * sync: An efficient mutex for native and green tasks has been implemented.
6444 * serialize: The `base64` module has seen some improvement. It treats
6445 newlines better, has non-string error values, and has seen general
6447 * fourcc: A `fourcc!` macro was introduced
6448 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6449 hexadecimal literal.
6452 * `rustpkg` has been deprecated and removed from the main repository. Its
6453 replacement, `cargo`, is under development.
6454 * Nightly builds of rust are now available
6455 * The memory usage of rustc has been improved many times throughout this
6457 * The build process supports disabling rpath support for the rustc binary
6459 * Code generation has improved in some cases, giving more information to the
6460 LLVM optimization passes to enable more extensive optimizations.
6461 * Debuginfo compatibility with lldb on OSX has been restored.
6462 * The master branch is now gated on an android bot, making building for
6463 android much more reliable.
6464 * Output flags have been centralized into one `--emit` flag.
6465 * Crate type flags have been centralized into one `--crate-type` flag.
6466 * Codegen flags have been consolidated behind a `-C` flag.
6467 * Linking against outdated crates now has improved error messages.
6468 * Error messages with lifetimes will often suggest how to annotate the
6469 function to fix the error.
6470 * Many more types are documented in the standard library, and new guides
6472 * Many `rustdoc` improvements:
6473 * code blocks are syntax highlighted.
6474 * render standalone markdown files.
6475 * the --test flag tests all code blocks by default.
6476 * exported macros are displayed.
6477 * re-exported types have their documentation inlined at the location of the
6479 * search works across crates that have been rendered to the same output
6483 Version 0.9 (2014-01-09)
6484 ==========================
6486 * ~1800 changes, numerous bugfixes
6489 * The `float` type has been removed. Use `f32` or `f64` instead.
6490 * A new facility for enabling experimental features (feature gating) has
6491 been added, using the crate-level `#[feature(foo)]` attribute.
6492 * Managed boxes (@) are now behind a feature gate
6493 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6494 standard library's `Gc` or `Rc` types instead.
6495 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6496 * Jumping back to the top of a loop is now done with `continue` instead of
6498 * Strings can no longer be mutated through index assignment.
6499 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6500 hash delimiters, as in `r###"foo"###`.
6501 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6503 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6504 * `@fn`s have been removed.
6505 * `do` only works with procs in order to make it obvious what the cost
6507 * Single-element tuple-like structs can no longer be dereferenced to
6508 obtain the inner value. A more comprehensive solution for overloading
6509 the dereference operator will be provided in the future.
6510 * The `#[link(...)]` attribute has been replaced with
6511 `#[crate_id = "name#vers"]`.
6512 * Empty `impl`s must be terminated with empty braces and may not be
6513 terminated with a semicolon.
6514 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6515 no longer has any special meaning.
6516 * The old `fmt!` string formatting macro has been removed.
6517 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6518 `print!` and `println!`.
6519 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6520 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6521 `extern mod foo = "bar"` instead.
6522 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6523 * Macros can have attributes.
6524 * Macros can expand to items with attributes.
6525 * Macros can expand to multiple items.
6526 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6527 * Comments may be nested.
6528 * Values automatically coerce to trait objects they implement, without
6530 * Enum discriminants are no longer an entire word but as small as needed to
6531 contain all the variants. The `repr` attribute can be used to override
6532 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6533 `#[repr(C)]` to match C enums.
6534 * Non-string literals are not allowed in attributes (they never worked).
6535 * The FFI now supports variadic functions.
6536 * Octal numeric literals, as in `0o7777`.
6537 * The `concat!` syntax extension performs compile-time string concatenation.
6538 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6539 removed as Rust no longer uses segmented stacks.
6540 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6541 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6542 not `*`; ignoring remaining fields of a struct is also done with `..`,
6543 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6544 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6545 * `rustc` supports the "system" calling convention, which defaults to the
6546 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6548 * The `type_overflow` lint (default: warn) checks literals for overflow.
6549 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6550 * The `attribute_usage` lint (default: warn) warns about unknown
6552 * The `unknown_features` lint (default: warn) warns about unknown
6554 * The `dead_code` lint (default: warn) checks for dead code.
6555 * Rust libraries can be linked statically to one another
6556 * `#[link_args]` is behind the `link_args` feature gate.
6557 * Native libraries are now linked with `#[link(name = "foo")]`
6558 * Native libraries can be statically linked to a rust crate
6559 (`#[link(name = "foo", kind = "static")]`).
6560 * Native OS X frameworks are now officially supported
6561 (`#[link(name = "foo", kind = "framework")]`).
6562 * The `#[thread_local]` attribute creates thread-local (not task-local)
6563 variables. Currently behind the `thread_local` feature gate.
6564 * The `return` keyword may be used in closures.
6565 * Types that can be copied via a memcpy implement the `Pod` kind.
6566 * The `cfg` attribute can now be used on struct fields and enum variants.
6569 * std: The `option` and `result` API's have been overhauled to make them
6570 simpler, more consistent, and more composable.
6571 * std: The entire `std::io` module has been replaced with one that is
6572 more comprehensive and that properly interfaces with the underlying
6573 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6575 * std: `io::util` contains a number of useful implementations of
6576 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6577 `ZeroReader`, `TeeReader`.
6578 * std: The reference counted pointer type `extra::rc` moved into std.
6579 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6580 just a wrapper around it).
6581 * std: The `Either` type has been removed.
6582 * std: `fmt::Default` can be implemented for any type to provide default
6583 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6584 * std: The `rand` API continues to be tweaked.
6585 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6586 on failure in gdb, is now named `rust_fail`.
6587 * std: The `each_key` and `each_value` methods on `HashMap` have been
6588 replaced by the `keys` and `values` iterators.
6589 * std: Functions dealing with type size and alignment have moved from the
6590 `sys` module to the `mem` module.
6591 * std: The `path` module was written and API changed.
6592 * std: `str::from_utf8` has been changed to cast instead of allocate.
6593 * std: `starts_with` and `ends_with` methods added to vectors via the
6594 `ImmutableEqVector` trait, which is in the prelude.
6595 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6596 if the index is out of bounds.
6597 * std: Task failure no longer propagates between tasks, as the model was
6598 complex, expensive, and incompatible with thread-based tasks.
6599 * std: The `Any` type can be used for dynamic typing.
6600 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6602 * std: Methods that produce iterators generally do not have an `_iter`
6604 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6605 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6606 * std: `util::ignore` renamed to `prelude::drop`.
6607 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6609 * std: `vec::raw` has seen a lot of cleanup and API changes.
6610 * std: The standard library no longer includes any C++ code, and very
6611 minimal C, eliminating the dependency on libstdc++.
6612 * std: Runtime scheduling and I/O functionality has been factored out into
6613 extensible interfaces and is now implemented by two different crates:
6614 libnative, for native threading and I/O; and libgreen, for green threading
6615 and I/O. This paves the way for using the standard library in more limited
6616 embedded environments.
6617 * std: The `comm` module has been rewritten to be much faster, have a
6618 simpler, more consistent API, and to work for both native and green
6620 * std: All libuv dependencies have been moved into the rustuv crate.
6621 * native: New implementations of runtime scheduling on top of OS threads.
6622 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6624 * green: The green thread scheduler and message passing types are almost
6626 * extra: The `flatpipes` module had bitrotted and was removed.
6627 * extra: All crypto functions have been removed and Rust now has a policy of
6628 not reimplementing crypto in the standard library. In the future crypto
6629 will be provided by external crates with bindings to established libraries.
6630 * extra: `c_vec` has been modernized.
6631 * extra: The `sort` module has been removed. Use the `sort` method on
6635 * The `rust` and `rusti` commands have been removed, due to lack of
6637 * `rustdoc` was completely rewritten.
6638 * `rustdoc` can test code examples in documentation.
6639 * `rustpkg` can test packages with the argument, 'test'.
6640 * `rustpkg` supports arbitrary dependencies, including C libraries.
6641 * `rustc`'s support for generating debug info is improved again.
6642 * `rustc` has better error reporting for unbalanced delimiters.
6643 * `rustc`'s JIT support was removed due to bitrot.
6644 * Executables and static libraries can be built with LTO (-Z lto)
6645 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6649 Version 0.8 (2013-09-26)
6650 ============================
6652 * ~2200 changes, numerous bugfixes
6655 * The `for` loop syntax has changed to work with the `Iterator` trait.
6656 * At long last, unwinding works on Windows.
6657 * Default methods are ready for use.
6658 * Many trait inheritance bugs fixed.
6659 * Owned and borrowed trait objects work more reliably.
6660 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6661 * rustc can omit emission of code for the `debug!` macro if it is passed
6663 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6664 for foo.rs, then foo/mod.rs, and will generate an error when both are
6666 * Strings no longer contain trailing nulls. The new `std::c_str` module
6667 provides new mechanisms for converting to C strings.
6668 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6669 * The FFI has been overhauled such that foreign functions are called directly,
6670 instead of through a stack-switching wrapper.
6671 * Calling a foreign function must be done through a Rust function with the
6672 `#[fixed_stack_segment]` attribute.
6673 * The `externfn!` macro can be used to declare both a foreign function and
6674 a `#[fixed_stack_segment]` wrapper at once.
6675 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6676 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6677 * `priv` is disallowed everywhere except for struct fields and enum variants.
6678 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6679 * `ref` bindings in irrefutable patterns work correctly now.
6680 * `char` is now prevented from containing invalid code points.
6681 * Casting to `bool` is no longer allowed.
6682 * `\0` is now accepted as an escape in chars and strings.
6683 * `yield` is a reserved keyword.
6684 * `typeof` is a reserved keyword.
6685 * Crates may be imported by URL with `extern mod foo = "url";`.
6686 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6687 * Static vectors can be initialized with repeating elements,
6688 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6689 * Static structs can be initialized with functional record update,
6690 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6691 * `cfg!` can be used to conditionally execute code based on the crate
6692 configuration, similarly to `#[cfg(...)]`.
6693 * The `unnecessary_qualification` lint detects unneeded module
6694 prefixes (default: allow).
6695 * Arithmetic operations have been implemented on the SIMD types in
6696 `std::unstable::simd`.
6697 * Exchange allocation headers were removed, reducing memory usage.
6698 * `format!` implements a completely new, extensible, and higher-performance
6699 string formatting system. It will replace `fmt!`.
6700 * `print!` and `println!` write formatted strings (using the `format!`
6701 extension) to stdout.
6702 * `write!` and `writeln!` write formatted strings (using the `format!`
6703 extension) to the new Writers in `std::rt::io`.
6704 * The library section in which a function or static is placed may
6705 be specified with `#[link_section = "..."]`.
6706 * The `proto!` syntax extension for defining bounded message protocols
6708 * `macro_rules!` is hygienic for `let` declarations.
6709 * The `#[export_name]` attribute specifies the name of a symbol.
6710 * `unreachable!` can be used to indicate unreachable code, and fails
6714 * std: Transitioned to the new runtime, written in Rust.
6715 * std: Added an experimental I/O library, `rt::io`, based on the new
6717 * std: A new generic `range` function was added to the prelude, replacing
6718 `uint::range` and friends.
6719 * std: `range_rev` no longer exists. Since range is an iterator it can be
6720 reversed with `range(lo, hi).invert()`.
6721 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6722 renamed to `unwrap_or`.
6723 * std: The `iterator` module was renamed to `iter`.
6724 * std: Integral types now support the `checked_add`, `checked_sub`, and
6725 `checked_mul` operations for detecting overflow.
6726 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6728 * std: Methods are standardizing on conventions for casting methods:
6729 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6731 * std: The `CString` type in `c_str` provides new ways to convert to and
6733 * std: `DoubleEndedIterator` can yield elements in two directions.
6734 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6736 * std: `str::from_bytes` renamed to `str::from_utf8`.
6737 * std: `pop_opt` and `shift_opt` methods added to vectors.
6738 * std: The task-local data interface no longer uses @, and keys are
6739 no longer function pointers.
6740 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6741 * std: Added `SharedPort` to `comm`.
6742 * std: `Eq` has a default method for `ne`; only `eq` is required
6744 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6745 is required in implementations.
6746 * std: `is_utf8` performance is improved, impacting many string functions.
6747 * std: `os::MemoryMap` provides cross-platform mmap.
6748 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6749 are not 'in-bounds' are considered undefined.
6750 * std: Many freestanding functions in `vec` removed in favor of methods.
6751 * std: Many freestanding functions on scalar types removed in favor of
6753 * std: Many options to task builders were removed since they don't make
6754 sense in the new scheduler design.
6755 * std: More containers implement `FromIterator` so can be created by the
6757 * std: More complete atomic types in `unstable::atomics`.
6758 * std: `comm::PortSet` removed.
6759 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6760 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6761 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6762 default implementations.
6763 * std: Various `from_str` functions were removed in favor of a generic
6764 `from_str` which is available in the prelude.
6765 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6766 * extra: `dlist`, the doubly-linked list was modernized.
6767 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6768 * extra: Added `glob` module, replacing `std::os::glob`.
6769 * extra: `rope` was removed.
6770 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6771 * extra: `net`, and `timer` were removed. The experimental replacements
6772 are `std::rt::io::net` and `std::rt::io::timer`.
6773 * extra: Iterators implemented for `SmallIntMap`.
6774 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6775 * extra: `SmallIntSet` removed. Use `BitvSet`.
6776 * extra: Performance of JSON parsing greatly improved.
6777 * extra: `semver` updated to SemVer 2.0.0.
6778 * extra: `term` handles more terminals correctly.
6779 * extra: `dbg` module removed.
6780 * extra: `par` module removed.
6781 * extra: `future` was cleaned up, with some method renames.
6782 * extra: Most free functions in `getopts` were converted to methods.
6785 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6786 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6787 similarly to gcc's `--march` flag.
6788 * rustc's performance compiling small crates is much better.
6789 * rustpkg has received many improvements.
6790 * rustpkg supports git tags as package IDs.
6791 * rustpkg builds into target-specific directories so it can be used for
6793 * The number of concurrent test tasks is controlled by the environment
6794 variable RUST_TEST_TASKS.
6795 * The test harness can now report metrics for benchmarks.
6796 * All tools have man pages.
6797 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6798 * The runtime uses jemalloc for allocations.
6799 * Segmented stacks are temporarily disabled as part of the transition to
6800 the new runtime. Stack overflows are possible!
6801 * A new documentation backend, rustdoc_ng, is available for use. It is
6802 still invoked through the normal `rustdoc` command.
6805 Version 0.7 (2013-07-03)
6806 =======================
6808 * ~2000 changes, numerous bugfixes
6811 * `impl`s no longer accept a visibility qualifier. Put them on methods
6813 * The borrow checker has been rewritten with flow-sensitivity, fixing
6814 many bugs and inconveniences.
6815 * The `self` parameter no longer implicitly means `&'self self`,
6816 and can be explicitly marked with a lifetime.
6817 * Overloadable compound operators (`+=`, etc.) have been temporarily
6818 removed due to bugs.
6819 * The `for` loop protocol now requires `for`-iterators to return `bool`
6820 so they compose better.
6821 * The `Durable` trait is replaced with the `'static` bounds.
6822 * Trait default methods work more often.
6823 * Structs with the `#[packed]` attribute have byte alignment and
6824 no padding between fields.
6825 * Type parameters bound by `Copy` must now be copied explicitly with
6827 * It is now illegal to move out of a dereferenced unsafe pointer.
6828 * `Option<~T>` is now represented as a nullable pointer.
6829 * `@mut` does dynamic borrow checks correctly.
6830 * The `main` function is only detected at the topmost level of the crate.
6831 The `#[main]` attribute is still valid anywhere.
6832 * Struct fields may no longer be mutable. Use inherited mutability.
6833 * The `#[no_send]` attribute makes a type that would otherwise be
6835 * The `#[no_freeze]` attribute makes a type that would otherwise be
6837 * Unbounded recursion will abort the process after reaching the limit
6838 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6839 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6840 are never implicitly copyable.
6841 * `#[static_assert]` makes compile-time assertions about static bools.
6842 * At long last, 'argument modes' no longer exist.
6843 * The rarely used `use mod` statement no longer exists.
6846 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6848 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6849 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6851 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6852 and unsuffixed integer literals.
6855 * The `core` crate was renamed to `std`.
6856 * The `std` crate was renamed to `extra`.
6857 * More and improved documentation.
6858 * std: `iterator` module for external iterator objects.
6859 * Many old-style (internal, higher-order function) iterators replaced by
6860 implementations of `Iterator`.
6861 * std: Many old internal vector and string iterators,
6862 incl. `any`, `all`. removed.
6863 * std: The `finalize` method of `Drop` renamed to `drop`.
6864 * std: The `drop` method now takes `&mut self` instead of `&self`.
6865 * std: The prelude no longer re-exports any modules, only types and traits.
6866 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6867 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6868 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6869 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6870 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6871 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6872 * std: Many types implement `Clone`.
6873 * std: `path` type renamed to `Path`.
6874 * std: `mut` module and `Mut` type removed.
6875 * std: Many standalone functions removed in favor of methods and iterators
6876 in `vec`, `str`. In the future methods will also work as functions.
6877 * std: `reinterpret_cast` removed. Use `transmute`.
6878 * std: ascii string handling in `std::ascii`.
6879 * std: `Rand` is implemented for ~/@.
6880 * std: `run` module for spawning processes overhauled.
6881 * std: Various atomic types added to `unstable::atomic`.
6882 * std: Various types implement `Zero`.
6883 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6884 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6885 * std: Added `os::mkdir_recursive`.
6886 * std: Added `os::glob` function performs filesystems globs.
6887 * std: `FuzzyEq` renamed to `ApproxEq`.
6888 * std: `Map` now defines `pop` and `swap` methods.
6889 * std: `Cell` constructors converted to static methods.
6890 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6891 * extra: `flate` module moved from `std` to `extra`.
6892 * extra: `fileinput` module for iterating over a series of files.
6893 * extra: `Complex` number type and `complex` module.
6894 * extra: `Rational` number type and `rational` module.
6895 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6896 * extra: `term` uses terminfo now, is more correct.
6897 * extra: `arc` functions converted to methods.
6898 * extra: Implementation of fixed output size variations of SHA-2.
6901 * `unused_variable` lint mode for unused variables (default: warn).
6902 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6904 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6906 * `dead_assignment` lint mode for unread variables (default: warn).
6907 * `unnecessary_allocation` lint mode detects some heap allocations that are
6908 immediately borrowed so could be written without allocating (default: warn).
6909 * `missing_doc` lint mode (default: allow).
6910 * `unreachable_code` lint mode (default: warn).
6911 * The `rusti` command has been rewritten and a number of bugs addressed.
6912 * rustc outputs in color on more terminals.
6913 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6914 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6915 * Compiling with `-g` will make the binary record information about
6916 dynamic borrowcheck failures for debugging.
6917 * rustdoc has a nicer stylesheet.
6918 * Various improvements to rustdoc.
6919 * Improvements to rustpkg (see the detailed release notes).
6922 Version 0.6 (2013-04-03)
6923 ========================
6925 * ~2100 changes, numerous bugfixes
6928 * The self type parameter in traits is now spelled `Self`
6929 * The `self` parameter in trait and impl methods must now be explicitly
6930 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6931 * Static methods no longer require the `static` keyword and instead
6932 are distinguished by the lack of a `self` parameter
6933 * Replaced the `Durable` trait with the `'static` lifetime
6934 * The old closure type syntax with the trailing sigil has been
6935 removed in favor of the more consistent leading sigil
6936 * `super` is a keyword, and may be prefixed to paths
6937 * Trait bounds are separated with `+` instead of whitespace
6938 * Traits are implemented with `impl Trait for Type`
6939 instead of `impl Type: Trait`
6940 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6941 * The `export` keyword has finally been removed
6942 * The `move` keyword has been removed (see "Semantic changes")
6943 * The interior mutability qualifier on vectors, `[mut T]`, has been
6944 removed. Use `&mut [T]`, etc.
6945 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6946 * `fail` is no longer a keyword. Use `fail!()`
6947 * `assert` is no longer a keyword. Use `assert!()`
6948 * `log` is no longer a keyword. use `debug!`, etc.
6949 * 1-tuples may be represented as `(T,)`
6950 * Struct fields may no longer be `mut`. Use inherited mutability,
6951 `@mut T`, `core::mut` or `core::cell`
6952 * `extern mod { ... }` is no longer valid syntax for foreign
6953 function modules. Use extern blocks: `extern { ... }`
6954 * Newtype enums removed. Use tuple-structs.
6955 * Trait implementations no longer support visibility modifiers
6956 * Pattern matching over vectors improved and expanded
6957 * `const` renamed to `static` to correspond to lifetime name,
6958 and make room for future `static mut` unsafe mutable globals.
6959 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6960 * `Clone` implementations can be automatically generated with
6961 `#[deriving(Clone)]`
6962 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6963 instead of `foo as Bar`.
6964 * Fixed length vector types are now written as `[int, .. 3]`
6965 instead of `[int * 3]`.
6966 * Fixed length vector types can express the length as a constant
6967 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6970 * Types with owned pointers or custom destructors move by default,
6971 eliminating the `move` keyword
6972 * All foreign functions are considered unsafe
6973 * &mut is now unaliasable
6974 * Writes to borrowed @mut pointers are prevented dynamically
6976 * The name of the main function can be customized using #[main]
6977 * The default type of an inferred closure is &fn instead of @fn
6978 * `use` statements may no longer be "chained" - they cannot import
6979 identifiers imported by previous `use` statements
6980 * `use` statements are crate relative, importing from the "top"
6981 of the crate by default. Paths may be prefixed with `super::`
6982 or `self::` to change the search behavior.
6983 * Method visibility is inherited from the implementation declaration
6984 * Structural records have been removed
6985 * Many more types can be used in static items, including enums
6986 'static-lifetime pointers and vectors
6987 * Pattern matching over vectors improved and expanded
6988 * Typechecking of closure types has been overhauled to
6989 improve inference and eliminate unsoundness
6990 * Macros leave scope at the end of modules, unless that module is
6991 tagged with #[macro_escape]
6994 * Added big integers to `std::bigint`
6995 * Removed `core::oldcomm` module
6996 * Added pipe-based `core::comm` module
6997 * Numeric traits have been reorganized under `core::num`
6998 * `vec::slice` finally returns a slice
6999 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7000 * Containers reorganized around traits in `core::container`
7001 * `core::dvec` removed, `~[T]` is a drop-in replacement
7002 * `core::send_map` renamed to `core::hashmap`
7003 * `std::map` removed; replaced with `core::hashmap`
7004 * `std::treemap` reimplemented as an owned balanced tree
7005 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7006 * `core::trie` added as a fast ordered map for integer keys
7007 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7008 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7009 overload the comparison operators, whereas `TotalOrd` is used
7010 by certain container types
7013 * Replaced the 'cargo' package manager with 'rustpkg'
7014 * Added all-purpose 'rust' tool
7015 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7016 * rustc now *attempts* to offer spelling suggestions
7017 * Improved support for ARM and Android
7018 * Preliminary MIPS backend
7019 * Improved foreign function ABI implementation for x86, x86_64
7020 * Various memory usage improvements
7021 * Rust code may be embedded in foreign code under limited circumstances
7022 * Inline assembler supported by new asm!() syntax extension.
7025 Version 0.5 (2012-12-21)
7026 ===========================
7028 * ~900 changes, numerous bugfixes
7031 * Removed `<-` move operator
7032 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7033 * Removed old fixed length vector syntax - `[T]/N`
7034 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7035 * Macros may now expand to items and statements
7036 * `a.b()` is always parsed as a method call, never as a field projection
7037 * `Eq` and `IterBytes` implementations can be automatically generated
7038 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7039 * Removed the special crate language for `.rc` files
7040 * Function arguments may consist of any irrefutable pattern
7043 * `&` and `~` pointers may point to objects
7044 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7045 * Enum variants may be structs
7046 * Destructors can be added to all nominal types with the Drop trait
7047 * Structs and nullary enum variants may be constants
7048 * Values that cannot be implicitly copied are now automatically moved
7049 without writing `move` explicitly
7050 * `&T` may now be coerced to `*T`
7051 * Coercions happen in `let` statements as well as function calls
7052 * `use` statements now take crate-relative paths
7053 * The module and type namespaces have been merged so that static
7054 method names can be resolved under the trait in which they are
7057 * Improved support for language features
7058 * Trait inheritance works in many scenarios
7059 * More support for explicit self arguments in methods - `self`, `&self`
7060 `@self`, and `~self` all generally work as expected
7061 * Static methods work in more situations
7062 * Experimental: Traits may declare default methods for the implementations
7066 * New condition handling system in `core::condition`
7067 * Timsort added to `std::sort`
7068 * New priority queue, `std::priority_queue`
7069 * Pipes for serializable types, `std::flatpipes'
7070 * Serialization overhauled to be trait-based
7071 * Expanded `getopts` definitions
7072 * Moved futures to `std`
7073 * More functions are pure now
7074 * `core::comm` renamed to `oldcomm`. Still deprecated
7075 * `rustdoc` and `cargo` are libraries now
7078 * Added a preliminary REPL, `rusti`
7079 * License changed from MIT to dual MIT/APL2
7082 Version 0.4 (2012-10-15)
7083 ==========================
7085 * ~2000 changes, numerous bugfixes
7088 * All keywords are now strict and may not be used as identifiers anywhere
7089 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7090 'of', 'with', 'to', 'class'.
7091 * Classes are replaced with simpler structs
7092 * Explicit method self types
7093 * `ret` became `return` and `alt` became `match`
7094 * `import` is now `use`; `use is now `extern mod`
7095 * `extern mod { ... }` is now `extern { ... }`
7096 * `use mod` is the recommended way to import modules
7097 * `pub` and `priv` replace deprecated export lists
7098 * The syntax of `match` pattern arms now uses fat arrow (=>)
7099 * `main` no longer accepts an args vector; use `os::args` instead
7102 * Trait implementations are now coherent, ala Haskell typeclasses
7103 * Trait methods may be static
7104 * Argument modes are deprecated
7105 * Borrowed pointers are much more mature and recommended for use
7106 * Strings and vectors in the static region are stored in constant memory
7107 * Typestate was removed
7108 * Resolution rewritten to be more reliable
7109 * Support for 'dual-mode' data structures (freezing and thawing)
7112 * Most binary operators can now be overloaded via the traits in
7114 * `std::net::url` for representing URLs
7115 * Sendable hash maps in `core::send_map`
7116 * `core::task' gained a (currently unsafe) task-local storage API
7119 * An efficient new intertask communication primitive called the pipe,
7120 along with a number of higher-level channel types, in `core::pipes`
7121 * `std::arc`, an atomically reference counted, immutable, shared memory
7123 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7124 * Futures are now based on pipes and sendable
7125 * More robust linked task failure
7126 * Improved task builder API
7129 * Improved error reporting
7130 * Preliminary JIT support
7131 * Preliminary work on precise GC
7132 * Extensive architectural improvements to rustc
7133 * Begun a transition away from buggy C++-based reflection (shape) code to
7134 Rust-based (visitor) code
7135 * All hash functions and tables converted to secure, randomized SipHash
7138 Version 0.3 (2012-07-12)
7139 ========================
7141 * ~1900 changes, numerous bugfixes
7143 * New coding conveniences
7144 * Integer-literal suffix inference
7145 * Per-item control over warnings, errors
7146 * #[cfg(windows)] and #[cfg(unix)] attributes
7147 * Documentation comments
7148 * More compact closure syntax
7149 * 'do' expressions for treating higher-order functions as
7151 * *-patterns (wildcard extended to all constructor fields)
7154 * Name resolution pass and exhaustiveness checker rewritten
7155 * Region pointers and borrow checking supersede alias
7157 * Init-ness checking is now provided by a region-based liveness
7158 pass instead of the typestate pass; same for last-use analysis
7159 * Extensive work on region pointers
7161 * Experimental new language features
7162 * Slices and fixed-size, interior-allocated vectors
7163 * #!-comments for lang versioning, shell execution
7164 * Destructors and iface implementation for classes;
7165 type-parameterized classes and class methods
7166 * 'const' type kind for types that can be used to implement
7167 shared-memory concurrency patterns
7171 * Removal of various obsolete features
7172 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7173 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7175 * Constructs: do-while loops ('do' repurposed), fn binding,
7176 resources (replaced by destructors)
7178 * Compiler reorganization
7179 * Syntax-layer of compiler split into separate crate
7180 * Clang (from LLVM project) integrated into build
7181 * Typechecker split into sub-modules
7184 * New time functions
7185 * Extension methods for many built-in types
7186 * Arc: atomic-refcount read-only / exclusive-use shared cells
7187 * Par: parallel map and search routines
7188 * Extensive work on libuv interface
7189 * Much vector code moved to libraries
7190 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7191 #include, #include_str, #include_bin
7194 * Cargo automatically resolves dependencies
7197 Version 0.2 (2012-03-29)
7198 =========================
7200 * >1500 changes, numerous bugfixes
7202 * New docs and doc tooling
7204 * New port: FreeBSD x86_64
7206 * Compilation model enhancements
7207 * Generics now specialized, multiply instantiated
7208 * Functions now inlined across separate crates
7210 * Scheduling, stack and threading fixes
7211 * Noticeably improved message-passing performance
7212 * Explicit schedulers
7216 * Experimental new language features
7217 * Operator overloading
7221 * Various language extensions
7222 * C-callback function types: 'crust fn ...'
7223 * Infinite-loop construct: 'loop { ... }'
7224 * Shorten 'mutable' to 'mut'
7225 * Required mutable-local qualifier: 'let mut ...'
7226 * Basic glob-exporting: 'export foo::*;'
7227 * Alt now exhaustive, 'alt check' for runtime-checked
7228 * Block-function form of 'for' loop, with 'break' and 'ret'.
7231 * AST quasi-quote syntax extension
7232 * Revived libuv interface
7233 * New modules: core::{future, iter}, std::arena
7234 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7235 * Extensive cleanup, regularization in libstd, libcore
7238 Version 0.1 (2012-01-20)
7239 ===============================
7241 * Most language features work, including:
7242 * Unique pointers, unique closures, move semantics
7243 * Interface-constrained generics
7244 * Static interface dispatch
7246 * Multithread task scheduling
7247 * Typestate predicates
7248 * Failure unwinding, destructors
7249 * Pattern matching and destructuring assignment
7250 * Lightweight block-lambda syntax
7251 * Preliminary macro-by-example
7253 * Compiler works with the following configurations:
7254 * Linux: x86 and x86_64 hosts and targets
7255 * macOS: x86 and x86_64 hosts and targets
7256 * Windows: x86 hosts and targets
7258 * Cross compilation / multi-target configuration supported.
7260 * Preliminary API-documentation and package-management tools included.
7264 * Documentation is incomplete.
7266 * Performance is below intended target.
7268 * Standard library APIs are subject to extensive change, reorganization.
7270 * Language-level versioning is not yet operational - future code will