1 Version 1.33.0 (2019-02-28)
2 ==========================
6 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
7 `#[cfg(target_vendor="linux")] fn main() { println!("Hello Linux!"); }`
8 - [You can now have multiple patterns in `if let` and `while let`
9 expressions.][57532] You can do this with the same syntax as a `match`
18 let state = Creature::Crab("Ferris");
20 if let Creature::Crab(name) | Creature::Person(name) = state {
21 println!("This creature's name is: {}", name);
25 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
26 this feature will by default produce a warning as this behaviour can be
27 unintuitive. E.g. `if let _ = 5 {}`
28 - [You can now use `let` bindings, assignments, expression statements, and pattern destructuring in
29 constant functions.][57175]
30 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
31 E.g. `#[cfg_attr(all(), must_use, optimize)]`
32 - [You can now specify a specific alignment with the `#[repr(packed)]`
33 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
34 with an alignment of 2 bytes and a size of 6 bytes.
35 - [You can now call unsafe constant functions.][57067] E.g.
37 const unsafe fn foo() -> i32 { 5 }
38 const fn bar() -> i32 {
42 - [You can now import an item from a module as a `_`.][56303] This allows you to
43 import a trait's impls, and not have the name in the namespace. E.g.
45 use std::io::Read as _;
47 // Allowed as there is only one `Read` in the module.
50 - [`extern` functions will now abort by default when panicking.][55982]
54 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
55 command line argument.][56351]
56 - [The mininum required LLVM version has been bumped to 6.0.][56642]
57 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
58 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
59 tier 2 support.][57130] Visit the [platform support][platform-support] page for
60 information on Rust's platform support.
61 - [Added support for the `thumbv7neon-linux-androideabi` and
62 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
63 - [Added support for the `x86_64-unknown-uefi` target.][56769]
67 - [The functions `overflowing_{add, sub, mul, shl, shr}` are now constant
68 functions for all numeric types.][57566]
69 - [The `get` method for all `NonZero` types is now constant.][57167]
70 - [The functions `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
71 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now constant for all
72 numeric types.][57234]
73 - [`Ipv4Addr::new` is now a constant function][57234]
77 - [`unix::FileExt::read_exact_at`]
78 - [`unix::FileExt::write_exact_at`]
79 - [`Option::transpose`]
80 - [`Result::transpose`]
81 - [`convert::identity`]
83 - [`Vec::resize_with`]
84 - [`VecDeque::resize_with`]
85 - [`Duration::as_millis`]
86 - [`Duration::as_micros`]
87 - [`Duration::as_nanos`]
91 - [Cargo should now rebuild a crate if a file was modified during the initial
95 [57615]: https://github.com/rust-lang/rust/pull/57615/
96 [57465]: https://github.com/rust-lang/rust/pull/57465/
97 [57532]: https://github.com/rust-lang/rust/pull/57532/
98 [57535]: https://github.com/rust-lang/rust/pull/57535/
99 [57566]: https://github.com/rust-lang/rust/pull/57566/
100 [57130]: https://github.com/rust-lang/rust/pull/57130/
101 [57167]: https://github.com/rust-lang/rust/pull/57167/
102 [57175]: https://github.com/rust-lang/rust/pull/57175/
103 [57234]: https://github.com/rust-lang/rust/pull/57234/
104 [57332]: https://github.com/rust-lang/rust/pull/57332/
105 [56947]: https://github.com/rust-lang/rust/pull/56947/
106 [57049]: https://github.com/rust-lang/rust/pull/57049/
107 [57067]: https://github.com/rust-lang/rust/pull/57067/
108 [56769]: https://github.com/rust-lang/rust/pull/56769/
109 [56642]: https://github.com/rust-lang/rust/pull/56642/
110 [56303]: https://github.com/rust-lang/rust/pull/56303/
111 [56351]: https://github.com/rust-lang/rust/pull/56351/
112 [55982]: https://github.com/rust-lang/rust/pull/55982/
113 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
114 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#read_exact_at
115 [`unix::FileExt::write_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#write_exact_at
116 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#transpose
117 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#transpose
118 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
119 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
120 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#resize_with
121 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#resize_with
122 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
123 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_micros
124 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#as_millis
125 [platform-support]: https://forge.rust-lang.org/platform-support.html
127 Version 1.32.0 (2019-01-17)
128 ==========================
133 - [You can now use the `?` operator in macro definitions.][56245] The `?`
134 operator allows you to specify zero or one repetitions similar to the `*` and
136 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
137 now always resolve to the item (`enum`, `struct`, etc.) available in the
138 module if present, before resolving to a external crate or an item the prelude.][56759]
141 enum Color { Red, Green, Blue }
147 - [You can now match against `PhantomData<T>` types.][55837]
148 - [You can now match against literals in macros with the `literal`
149 specifier.][56072] This will match against a literal of any type.
150 E.g. `1`, `'A'`, `"Hello World"`
151 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
153 struct Point(i32, i32);
156 pub fn new(x: i32, y: i32) -> Self {
160 pub fn is_origin(&self) -> bool {
168 - [Self can also now be used in type definitions.][56366] E.g.
172 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
175 Cons(T, Box<Self>) // likewise here
178 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
179 a `impl Trait` or `dyn Trait` is returned and unused in the program.
183 - [The default allocator has changed from jemalloc to the default allocator on
184 your system.][55238] The compiler itself on Linux & macOS will still use
185 jemalloc, but programs compiled with it will use the system allocator.
186 - [Added the `aarch64-pc-windows-msvc` target.][55702]
190 - [`PathBuf` now implements `FromStr`.][55148]
191 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
192 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
193 easily debug expressions in your rust program. E.g.
196 let b = dbg!(a * 2) + 1;
197 // ^-- prints: [src/main.rs:4] a * 2 = 4
201 The following APIs are now `const` functions and can be used in a
205 - [`UnsafeCell::get`]
208 - [`ManuallyDrop::new`]
209 - [`ManuallyDrop::into_inner`]
210 - [`RangeInclusive::start`]
211 - [`RangeInclusive::end`]
212 - [`NonNull::as_ptr`]
215 - [`Duration::as_secs`]
216 - [`Duration::subsec_millis`]
217 - [`Duration::subsec_micros`]
218 - [`Duration::subsec_nanos`]
220 - [`Ipv4Addr::is_unspecified`]
222 - [`Ipv6Addr::octets`]
226 - [`i8::to_be_bytes`]
227 - [`i8::to_le_bytes`]
228 - [`i8::to_ne_bytes`]
229 - [`i8::from_be_bytes`]
230 - [`i8::from_le_bytes`]
231 - [`i8::from_ne_bytes`]
232 - [`i16::to_be_bytes`]
233 - [`i16::to_le_bytes`]
234 - [`i16::to_ne_bytes`]
235 - [`i16::from_be_bytes`]
236 - [`i16::from_le_bytes`]
237 - [`i16::from_ne_bytes`]
238 - [`i32::to_be_bytes`]
239 - [`i32::to_le_bytes`]
240 - [`i32::to_ne_bytes`]
241 - [`i32::from_be_bytes`]
242 - [`i32::from_le_bytes`]
243 - [`i32::from_ne_bytes`]
244 - [`i64::to_be_bytes`]
245 - [`i64::to_le_bytes`]
246 - [`i64::to_ne_bytes`]
247 - [`i64::from_be_bytes`]
248 - [`i64::from_le_bytes`]
249 - [`i64::from_ne_bytes`]
250 - [`i128::to_be_bytes`]
251 - [`i128::to_le_bytes`]
252 - [`i128::to_ne_bytes`]
253 - [`i128::from_be_bytes`]
254 - [`i128::from_le_bytes`]
255 - [`i128::from_ne_bytes`]
256 - [`isize::to_be_bytes`]
257 - [`isize::to_le_bytes`]
258 - [`isize::to_ne_bytes`]
259 - [`isize::from_be_bytes`]
260 - [`isize::from_le_bytes`]
261 - [`isize::from_ne_bytes`]
262 - [`u8::to_be_bytes`]
263 - [`u8::to_le_bytes`]
264 - [`u8::to_ne_bytes`]
265 - [`u8::from_be_bytes`]
266 - [`u8::from_le_bytes`]
267 - [`u8::from_ne_bytes`]
268 - [`u16::to_be_bytes`]
269 - [`u16::to_le_bytes`]
270 - [`u16::to_ne_bytes`]
271 - [`u16::from_be_bytes`]
272 - [`u16::from_le_bytes`]
273 - [`u16::from_ne_bytes`]
274 - [`u32::to_be_bytes`]
275 - [`u32::to_le_bytes`]
276 - [`u32::to_ne_bytes`]
277 - [`u32::from_be_bytes`]
278 - [`u32::from_le_bytes`]
279 - [`u32::from_ne_bytes`]
280 - [`u64::to_be_bytes`]
281 - [`u64::to_le_bytes`]
282 - [`u64::to_ne_bytes`]
283 - [`u64::from_be_bytes`]
284 - [`u64::from_le_bytes`]
285 - [`u64::from_ne_bytes`]
286 - [`u128::to_be_bytes`]
287 - [`u128::to_le_bytes`]
288 - [`u128::to_ne_bytes`]
289 - [`u128::from_be_bytes`]
290 - [`u128::from_le_bytes`]
291 - [`u128::from_ne_bytes`]
292 - [`usize::to_be_bytes`]
293 - [`usize::to_le_bytes`]
294 - [`usize::to_ne_bytes`]
295 - [`usize::from_be_bytes`]
296 - [`usize::from_le_bytes`]
297 - [`usize::from_ne_bytes`]
301 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
302 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
306 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
310 - [The argument types for AVX's
311 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
312 been changed from `*const` to `*mut` as the previous implementation
316 [55148]: https://github.com/rust-lang/rust/pull/55148/
317 [55238]: https://github.com/rust-lang/rust/pull/55238/
318 [55280]: https://github.com/rust-lang/rust/pull/55280/
319 [55610]: https://github.com/rust-lang/rust/pull/55610/
320 [55663]: https://github.com/rust-lang/rust/pull/55663/
321 [55702]: https://github.com/rust-lang/rust/pull/55702/
322 [55837]: https://github.com/rust-lang/rust/pull/55837/
323 [55843]: https://github.com/rust-lang/rust/pull/55843/
324 [56072]: https://github.com/rust-lang/rust/pull/56072/
325 [56245]: https://github.com/rust-lang/rust/pull/56245/
326 [56365]: https://github.com/rust-lang/rust/pull/56365/
327 [56366]: https://github.com/rust-lang/rust/pull/56366/
328 [56395]: https://github.com/rust-lang/rust/pull/56395/
329 [56759]: https://github.com/rust-lang/rust/pull/56759/
330 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
331 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
332 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
333 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
334 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
335 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
336 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
337 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
338 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
339 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
340 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
341 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
342 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
343 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
344 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
345 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
346 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
347 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
348 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
349 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
350 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
351 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
352 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
353 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
354 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
355 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
356 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
357 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
358 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
359 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
360 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
361 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
362 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
363 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
364 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
365 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
366 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
367 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
368 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
369 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
370 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
371 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
372 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
373 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
374 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
375 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
376 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
377 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
378 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
379 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
380 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
381 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
382 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
383 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
384 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
385 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
386 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
387 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
388 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
389 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
390 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
391 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
392 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
393 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
394 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
395 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
396 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
397 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
398 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
399 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
400 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
401 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
402 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
403 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
404 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
405 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
406 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
407 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
408 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
409 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
410 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
411 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
412 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
413 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
414 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
415 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
416 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
417 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
418 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
419 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
420 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
421 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
422 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
425 Version 1.31.1 (2018-12-20)
426 ===========================
428 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
429 - [Fix broken go-to-definition in RLS][rls/1171]
430 - [Fix infinite loop on hover in RLS][rls/1170]
432 [56562]: https://github.com/rust-lang/rust/pull/56562
433 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
434 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
436 Version 1.31.0 (2018-12-06)
437 ==========================
441 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
442 - [New lifetime elision rules now allow for eliding lifetimes in functions and
443 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
444 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
446 - [You can now define and use `const` functions.][54835] These are currently
447 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
448 [language reference][const-reference] for what exactly is available.
449 - [You can now use tool lints, which allow you to scope lints from external
450 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
451 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
452 a crate, not just in exported functions.][54451]
453 - [You can now use parentheses in pattern matches.][54497]
457 - [Updated musl to 1.1.20][54430]
461 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
462 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
463 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
464 into `Option<&mut T>` using the `From` trait.][53218]
465 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
470 - [`slice::align_to`]
471 - [`slice::align_to_mut`]
472 - [`slice::chunks_exact`]
473 - [`slice::chunks_exact_mut`]
475 - [`slice::rchunks_mut`]
476 - [`slice::rchunks_exact`]
477 - [`slice::rchunks_exact_mut`]
478 - [`Option::replace`]
482 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
483 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
484 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
486 [52813]: https://github.com/rust-lang/rust/pull/52813/
487 [53218]: https://github.com/rust-lang/rust/pull/53218/
488 [53555]: https://github.com/rust-lang/rust/issues/53555/
489 [54057]: https://github.com/rust-lang/rust/pull/54057/
490 [54240]: https://github.com/rust-lang/rust/pull/54240/
491 [54430]: https://github.com/rust-lang/rust/pull/54430/
492 [54451]: https://github.com/rust-lang/rust/pull/54451/
493 [54497]: https://github.com/rust-lang/rust/pull/54497/
494 [54778]: https://github.com/rust-lang/rust/pull/54778/
495 [54835]: https://github.com/rust-lang/rust/pull/54835/
496 [54870]: https://github.com/rust-lang/rust/pull/54870/
497 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
498 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
499 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
500 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
501 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
502 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
503 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
504 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
505 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
506 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
507 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
508 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
509 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
510 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
512 Version 1.30.1 (2018-11-08)
513 ===========================
515 - [Fixed overflow ICE in rustdoc][54199]
516 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
518 [54199]: https://github.com/rust-lang/rust/pull/54199
519 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
521 Version 1.30.0 (2018-10-25)
522 ==========================
526 - [Procedural macros are now available.][52081] These kinds of macros allow for
527 more powerful code generation. There is a [new chapter available][proc-macros]
528 in the Rust Programming Language book that goes further in depth.
529 - [You can now use keywords as identifiers using the raw identifiers
530 syntax (`r#`),][53236] e.g. `let r#for = true;`
531 - [Using anonymous parameters in traits is now deprecated with a warning and
532 will be a hard error in the 2018 edition.][53272]
533 - [You can now use `crate` in paths.][54404] This allows you to refer to the
534 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
535 - [Using a external crate no longer requires being prefixed with `::`.][54404]
536 Previously, using a external crate in a module without a use statement
537 required `let json = ::serde_json::from_str(foo);` but can now be written
538 as `let json = serde_json::from_str(foo);`.
539 - [You can now apply the `#[used]` attribute to static items to prevent the
540 compiler from optimising them away, even if they appear to be unused,][51363]
541 e.g. `#[used] static FOO: u32 = 1;`
542 - [You can now import and reexport macros from other crates with the `use`
543 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
544 the root module of the crate. If your macro relies on calling other local
545 macros, it is recommended to export with the
546 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
548 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
549 using the `vis` specifier.][53370]
550 - [Non-macro attributes now allow all forms of literals, not just
551 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
552 write `#[attr(true)]`.
553 - [You can now specify a function to handle a panic in the Rust runtime with the
554 `#[panic_handler]` attribute.][51366]
558 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
559 - [Added the `aarch64-unknown-netbsd` target][53165]
563 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
567 - [`Ipv4Addr::BROADCAST`]
568 - [`Ipv4Addr::LOCALHOST`]
569 - [`Ipv4Addr::UNSPECIFIED`]
570 - [`Ipv6Addr::LOCALHOST`]
571 - [`Ipv6Addr::UNSPECIFIED`]
572 - [`Iterator::find_map`]
574 The following methods are replacement methods for `trim_left`, `trim_right`,
575 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
577 - [`str::trim_end_matches`]
579 - [`str::trim_start_matches`]
580 - [`str::trim_start`]
584 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
585 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
586 equivalent to calling `rustdoc --error-format=json`.
587 - [Cargo will now provide a progress bar for builds.][cargo/5995]
591 - [`rustdoc` allows you to specify what edition to treat your code as with the
592 `--edition` option.][54057]
593 - [`rustdoc` now has the `--color` (specify whether to output color) and
594 `--error-format` (specify error format, e.g. `json`) options.][53003]
595 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
596 debug symbols.][53774]
597 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
598 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
600 [50911]: https://github.com/rust-lang/rust/pull/50911/
601 [51363]: https://github.com/rust-lang/rust/pull/51363/
602 [51366]: https://github.com/rust-lang/rust/pull/51366/
603 [52081]: https://github.com/rust-lang/rust/pull/52081/
604 [53003]: https://github.com/rust-lang/rust/pull/53003/
605 [53033]: https://github.com/rust-lang/rust/pull/53033/
606 [53044]: https://github.com/rust-lang/rust/pull/53044/
607 [53165]: https://github.com/rust-lang/rust/pull/53165/
608 [53213]: https://github.com/rust-lang/rust/pull/53213/
609 [53236]: https://github.com/rust-lang/rust/pull/53236/
610 [53272]: https://github.com/rust-lang/rust/pull/53272/
611 [53370]: https://github.com/rust-lang/rust/pull/53370/
612 [53459]: https://github.com/rust-lang/rust/pull/53459/
613 [53774]: https://github.com/rust-lang/rust/pull/53774/
614 [53822]: https://github.com/rust-lang/rust/pull/53822/
615 [54057]: https://github.com/rust-lang/rust/pull/54057/
616 [54146]: https://github.com/rust-lang/rust/pull/54146/
617 [54404]: https://github.com/rust-lang/rust/pull/54404/
618 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
619 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
620 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
621 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
623 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
624 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
625 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
626 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
627 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
628 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
629 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
630 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
631 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
632 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
635 Version 1.29.2 (2018-10-11)
636 ===========================
638 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
639 - The `rls-preview` component on the windows-gnu targets has been restored.
641 [54639]: https://github.com/rust-lang/rust/pull/54639
644 Version 1.29.1 (2018-09-25)
645 ===========================
650 - The standard library's `str::repeat` function contained an out of bounds write
651 caused by an integer overflow. This has been fixed by deterministically
652 panicking when an overflow happens.
654 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
658 Version 1.29.0 (2018-09-13)
659 ==========================
663 - [Bumped minimum LLVM version to 5.0.][51899]
664 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
665 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
669 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
670 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
671 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
672 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
674 - [`Cell<T>` now allows `T` to be unsized.][50494]
675 - [`SocketAddr` is now stable on Redox.][52656]
680 - [`Iterator::flatten`]
685 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
686 `--locked` to disable this behavior.
687 - [`cargo-install` will now allow you to cross compile an install
688 using `--target`.][cargo/5614]
689 - [Added the `cargo-fix` subcommand to automatically move project code from
690 2015 edition to 2018.][cargo/5723]
691 - [`cargo doc` can now optionally document private types using the
692 `--document-private-items` flag.][cargo/5543]
696 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
697 the specified level to that level.][52354] For example `--cap-lints warn`
698 will demote `deny` and `forbid` lints to `warn`.
699 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
700 fails and `101` if there is a panic.][52197]
701 - [A preview of clippy has been made available through rustup.][51122]
702 You can install the preview with `rustup component add clippy-preview`.
706 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
707 Use `str::get_unchecked(begin..end)` instead.
708 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
709 Consider using the `home_dir` function from
710 https://crates.io/crates/dirs instead.
711 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
712 - [`cfg` attributes and `--cfg` command line flags are now more
713 strictly validated.][53893]
715 [53893]: https://github.com/rust-lang/rust/pull/53893/
716 [52861]: https://github.com/rust-lang/rust/pull/52861/
717 [52656]: https://github.com/rust-lang/rust/pull/52656/
718 [52239]: https://github.com/rust-lang/rust/pull/52239/
719 [52330]: https://github.com/rust-lang/rust/pull/52330/
720 [52354]: https://github.com/rust-lang/rust/pull/52354/
721 [52402]: https://github.com/rust-lang/rust/pull/52402/
722 [52103]: https://github.com/rust-lang/rust/pull/52103/
723 [52197]: https://github.com/rust-lang/rust/pull/52197/
724 [51807]: https://github.com/rust-lang/rust/pull/51807/
725 [51899]: https://github.com/rust-lang/rust/pull/51899/
726 [51912]: https://github.com/rust-lang/rust/pull/51912/
727 [51511]: https://github.com/rust-lang/rust/pull/51511/
728 [51619]: https://github.com/rust-lang/rust/pull/51619/
729 [51656]: https://github.com/rust-lang/rust/pull/51656/
730 [51178]: https://github.com/rust-lang/rust/pull/51178/
731 [51122]: https://github.com/rust-lang/rust/pull/51122
732 [50494]: https://github.com/rust-lang/rust/pull/50494/
733 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
734 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
735 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
736 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
737 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
738 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
739 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
742 Version 1.28.0 (2018-08-02)
743 ===========================
747 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
748 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
749 the inner type across Foreign Function Interface (FFI) boundaries.
750 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
751 and can now be used as identifiers.][51196]
752 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
753 stable.][51241] This will allow users to specify a global allocator for
755 - [Unit test functions marked with the `#[test]` attribute can now return
756 `Result<(), E: Debug>` in addition to `()`.][51298]
757 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
758 allows macros to easily target lifetimes.
762 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
763 prioritise making smaller binary sizes. `z` is the same as `s` with the
764 exception that it does not vectorise loops, which typically results in an even
766 - [The short error format is now stable.][49546] Specified with
767 `--error-format=short` this option will provide a more compressed output of
769 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
770 - [Reduced the number of allocations in the macro parser.][50855] This can
771 improve compile times of macro heavy crates on average by 5%.
775 - [Implemented `Default` for `&mut str`.][51306]
776 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
777 - [Implemented `Extend` for `()`.][50234]
778 - [The `Debug` implementation of `time::Duration` should now be more easily
779 human readable.][50364] Previously a `Duration` of one second would printed as
780 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
781 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
782 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
783 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
784 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
785 for `PathBuf`.][50170]
786 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
787 and `Wrapping<i128>`.][50465]
788 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
789 possible.][51050] This can provide up to a 40% speed increase.
790 - [Improved error messages when using `format!`.][50610]
794 - [`Iterator::step_by`]
795 - [`Path::ancestors`]
796 - [`SystemTime::UNIX_EPOCH`]
797 - [`alloc::GlobalAlloc`]
799 - [`alloc::LayoutErr`]
802 - [`alloc::alloc_zeroed`]
805 - [`alloc::handle_alloc_error`]
806 - [`btree_map::Entry::or_default`]
808 - [`hash_map::Entry::or_default`]
809 - [`iter::repeat_with`]
810 - [`num::NonZeroUsize`]
811 - [`num::NonZeroU128`]
812 - [`num::NonZeroU16`]
813 - [`num::NonZeroU32`]
814 - [`num::NonZeroU64`]
816 - [`ops::RangeBounds`]
817 - [`slice::SliceIndex`]
818 - [`slice::from_mut`]
819 - [`slice::from_ref`]
820 - [`{Any + Send + Sync}::downcast_mut`]
821 - [`{Any + Send + Sync}::downcast_ref`]
822 - [`{Any + Send + Sync}::is`]
826 - [Cargo will now no longer allow you to publish crates with build scripts that
827 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
828 considered to be immutable.
832 - [The `suggestion_applicability` field in `rustc`'s json output is now
833 stable.][50486] This will allow dev tools to check whether a code suggestion
838 - [Rust will consider trait objects with duplicated constraints to be the same
839 type as without the duplicated constraint.][51276] For example the below code will
845 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
848 impl Trait + Send + Send {
849 fn test(&self) { println!("two"); }
853 [49546]: https://github.com/rust-lang/rust/pull/49546/
854 [50143]: https://github.com/rust-lang/rust/pull/50143/
855 [50170]: https://github.com/rust-lang/rust/pull/50170/
856 [50234]: https://github.com/rust-lang/rust/pull/50234/
857 [50265]: https://github.com/rust-lang/rust/pull/50265/
858 [50364]: https://github.com/rust-lang/rust/pull/50364/
859 [50385]: https://github.com/rust-lang/rust/pull/50385/
860 [50465]: https://github.com/rust-lang/rust/pull/50465/
861 [50486]: https://github.com/rust-lang/rust/pull/50486/
862 [50554]: https://github.com/rust-lang/rust/pull/50554/
863 [50610]: https://github.com/rust-lang/rust/pull/50610/
864 [50855]: https://github.com/rust-lang/rust/pull/50855/
865 [51050]: https://github.com/rust-lang/rust/pull/51050/
866 [51196]: https://github.com/rust-lang/rust/pull/51196/
867 [51200]: https://github.com/rust-lang/rust/pull/51200/
868 [51241]: https://github.com/rust-lang/rust/pull/51241/
869 [51276]: https://github.com/rust-lang/rust/pull/51276/
870 [51298]: https://github.com/rust-lang/rust/pull/51298/
871 [51306]: https://github.com/rust-lang/rust/pull/51306/
872 [51562]: https://github.com/rust-lang/rust/pull/51562/
873 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
874 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
875 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
876 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
877 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
878 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
879 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
880 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
881 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
882 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
883 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
884 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
885 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
886 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
887 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
888 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
889 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
890 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
891 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
892 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
893 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
894 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
895 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
896 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
897 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
898 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
899 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
900 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
901 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
902 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
904 Version 1.27.2 (2018-07-20)
905 ===========================
910 - The borrow checker was fixed to avoid potential unsoundness when using
911 match ergonomics: [#52213][52213].
913 [52213]: https://github.com/rust-lang/rust/issues/52213
915 Version 1.27.1 (2018-07-10)
916 ===========================
921 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
922 when running, which enabled executing code as some other user on a
923 given machine. This release fixes that vulnerability; you can read
924 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
926 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
931 - The borrow checker was fixed to avoid an additional potential unsoundness when using
932 match ergonomics: [#51415][51415], [#49534][49534].
934 [51415]: https://github.com/rust-lang/rust/issues/51415
935 [49534]: https://github.com/rust-lang/rust/issues/49534
936 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
937 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
939 Version 1.27.0 (2018-06-21)
940 ==========================
944 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
945 be used as an identifier.
946 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
947 bare `Trait` syntax, and should make it clearer when being used in tandem with
948 `impl Trait` because it is equivalent to the following syntax:
949 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
950 `Box<Trait> == Box<dyn Trait>`.
951 - [Attributes on generic parameters such as types and lifetimes are
952 now stable.][48851] e.g.
953 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
954 - [The `#[must_use]` attribute can now also be used on functions as well as
955 types.][48925] It provides a lint that by default warns users when the
956 value returned by a function has not been used.
960 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
964 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
965 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
966 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
967 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
969 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
970 std are now available in core.][49896]
971 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
973 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
974 that the operation isn't done in place.
975 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
976 the `#[must_use]` attribute][49533] to warn about unused potentially
977 expensive allocations.
981 - [`DoubleEndedIterator::rfind`]
982 - [`DoubleEndedIterator::rfold`]
983 - [`DoubleEndedIterator::try_rfold`]
984 - [`Duration::from_micros`]
985 - [`Duration::from_nanos`]
986 - [`Duration::subsec_micros`]
987 - [`Duration::subsec_millis`]
988 - [`HashMap::remove_entry`]
989 - [`Iterator::try_fold`]
990 - [`Iterator::try_for_each`]
993 - [`String::replace_range`]
994 - [`Take::set_limit`]
995 - [`hint::unreachable_unchecked`]
996 - [`os::unix::process::parent_id`]
997 - [`ptr::swap_nonoverlapping`]
998 - [`slice::rsplit_mut`]
1000 - [`slice::swap_with_slice`]
1004 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
1005 `readme`, and `repository` fields.][cargo/5386]
1006 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
1007 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
1008 a different directory than `target` for placing compilation artifacts.
1009 - [Cargo will be adding automatic target inference for binaries, benchmarks,
1010 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
1011 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
1012 where cargo would infer a binary, Cargo will produce a warning. You can
1013 disable this feature ahead of time by setting any of the following to false:
1014 `autobins`, `autobenches`, `autoexamples`, `autotests`.
1015 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
1016 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
1020 - [Added “The Rustc book” into the official documentation.][49707]
1021 [“The Rustc book”] documents and teaches how to use the rustc compiler.
1022 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
1026 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
1027 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
1028 compile, `"".is_empty()` will still compile.
1029 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
1030 will only print the inner type.][48553] E.g.
1031 `print!("{:?}", AtomicBool::new(true))` will print `true`,
1032 not `AtomicBool(true)`.
1033 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
1034 could enter higher numbers but they were not supported by LLVM. Up to 512MB
1035 alignment should cover all use cases.
1036 - The `.description()` method on the `std::error::Error` trait
1037 [has been soft-deprecated][50163]. It is no longer required to implement it.
1039 [48553]: https://github.com/rust-lang/rust/pull/48553/
1040 [48851]: https://github.com/rust-lang/rust/pull/48851/
1041 [48925]: https://github.com/rust-lang/rust/pull/48925/
1042 [49533]: https://github.com/rust-lang/rust/pull/49533/
1043 [49623]: https://github.com/rust-lang/rust/pull/49623/
1044 [49630]: https://github.com/rust-lang/rust/pull/49630/
1045 [49664]: https://github.com/rust-lang/rust/pull/49664/
1046 [49699]: https://github.com/rust-lang/rust/pull/49699/
1047 [49707]: https://github.com/rust-lang/rust/pull/49707/
1048 [49719]: https://github.com/rust-lang/rust/pull/49719/
1049 [49896]: https://github.com/rust-lang/rust/pull/49896/
1050 [49968]: https://github.com/rust-lang/rust/pull/49968/
1051 [50163]: https://github.com/rust-lang/rust/pull/50163
1052 [50177]: https://github.com/rust-lang/rust/pull/50177/
1053 [50378]: https://github.com/rust-lang/rust/pull/50378/
1054 [50398]: https://github.com/rust-lang/rust/pull/50398/
1055 [50423]: https://github.com/rust-lang/rust/pull/50423/
1056 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
1057 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
1058 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
1059 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
1060 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
1061 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
1062 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
1063 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
1064 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
1065 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
1066 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
1067 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1068 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1069 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
1070 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
1071 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
1072 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
1073 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
1074 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
1075 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
1076 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
1077 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
1078 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1079 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
1080 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
1081 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
1082 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
1083 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
1084 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
1085 [“The Rustc book”]: https://doc.rust-lang.org/rustc
1088 Version 1.26.2 (2018-06-05)
1089 ==========================
1094 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
1096 [51117]: https://github.com/rust-lang/rust/issues/51117
1099 Version 1.26.1 (2018-05-29)
1100 ==========================
1105 - [RLS now works on Windows.][50646]
1106 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
1112 - [`fn main() -> impl Trait` no longer works for non-Termination
1114 This reverts an accidental stabilization.
1115 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
1116 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
1118 [50646]: https://github.com/rust-lang/rust/issues/50646
1119 [50656]: https://github.com/rust-lang/rust/pull/50656
1120 [50812]: https://github.com/rust-lang/rust/pull/50812
1121 [50950]: https://github.com/rust-lang/rust/issues/50950
1122 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
1124 Version 1.26.0 (2018-05-10)
1125 ==========================
1129 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1130 implement either or both traits.][49299]
1131 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1132 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1133 lifetime can be elided.][49458]
1134 - [`impl Trait` is now stable allowing you to have abstract types in returns
1135 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1136 `fn open(path: impl AsRef<Path>)`.
1137 - [Pattern matching will now automatically apply dereferences.][49394]
1138 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1139 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1140 - [A lot of operations are now available in a const context.][46882] E.g. You
1141 can now index into constant arrays, reference and dereference into constants,
1142 and use tuple struct constructors.
1143 - [Fixed entry slice patterns are now stable.][48516] E.g.
1145 let points = [1, 2, 3, 4];
1147 [1, 2, 3, 4] => println!("All points were sequential."),
1148 _ => println!("Not all points were sequential."),
1155 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1156 - [Fixed exponential projection complexity on nested types.][48296]
1157 This can provide up to a ~12% reduction in compile times for certain crates.
1158 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1159 to remap path prefixes outputted by the compiler.
1160 - [Added `powerpc-unknown-netbsd` target.][48281]
1164 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1165 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1166 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1167 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1168 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1169 - [`ascii::escape_default` is now available in libcore.][48735]
1170 - [Trailing commas are now supported in std and core macros.][48056]
1171 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1172 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1177 - [`*const T::copy_to_nonoverlapping`]
1178 - [`*const T::copy_to`]
1179 - [`*const T::read_unaligned`]
1180 - [`*const T::read_volatile`]
1181 - [`*const T::read`]
1183 - [`*const T::wrapping_add`]
1184 - [`*const T::wrapping_sub`]
1186 - [`*mut T::copy_to_nonoverlapping`]
1187 - [`*mut T::copy_to`]
1188 - [`*mut T::read_unaligned`]
1189 - [`*mut T::read_volatile`]
1191 - [`*mut T::replace`]
1194 - [`*mut T::wrapping_add`]
1195 - [`*mut T::wrapping_sub`]
1196 - [`*mut T::write_bytes`]
1197 - [`*mut T::write_unaligned`]
1198 - [`*mut T::write_volatile`]
1201 - [`FromUtf8Error::as_bytes`]
1202 - [`LocalKey::try_with`]
1203 - [`Option::cloned`]
1204 - [`btree_map::Entry::and_modify`]
1205 - [`fs::read_to_string`]
1208 - [`hash_map::Entry::and_modify`]
1209 - [`iter::FusedIterator`]
1210 - [`ops::RangeInclusive`]
1211 - [`ops::RangeToInclusive`]
1213 - [`slice::rotate_left`]
1214 - [`slice::rotate_right`]
1215 - [`String::retain`]
1220 - [Cargo will now output path to custom commands when `-v` is
1221 passed with `--list`][cargo/5041]
1222 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1226 - [The second edition of "The Rust Programming Language" book is now recommended
1227 over the first.][48404]
1232 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1233 syntax is now invalid.
1235 use std::ops::Fn as dyn;
1236 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1238 - [The result of dereferences are no longer promoted to `'static`.][47408]
1242 const PAIR: &(i32, i32) = &(0, 1);
1243 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1246 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1247 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1249 - [Removed hoedown from rustdoc.][48274]
1250 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1252 [46882]: https://github.com/rust-lang/rust/pull/46882
1253 [47379]: https://github.com/rust-lang/rust/pull/47379
1254 [47408]: https://github.com/rust-lang/rust/pull/47408
1255 [47813]: https://github.com/rust-lang/rust/pull/47813
1256 [48056]: https://github.com/rust-lang/rust/pull/48056
1257 [48125]: https://github.com/rust-lang/rust/pull/48125
1258 [48166]: https://github.com/rust-lang/rust/pull/48166
1259 [48235]: https://github.com/rust-lang/rust/pull/48235
1260 [48274]: https://github.com/rust-lang/rust/pull/48274
1261 [48281]: https://github.com/rust-lang/rust/pull/48281
1262 [48296]: https://github.com/rust-lang/rust/pull/48296
1263 [48326]: https://github.com/rust-lang/rust/pull/48326
1264 [48359]: https://github.com/rust-lang/rust/pull/48359
1265 [48404]: https://github.com/rust-lang/rust/pull/48404
1266 [48481]: https://github.com/rust-lang/rust/pull/48481
1267 [48516]: https://github.com/rust-lang/rust/pull/48516
1268 [48628]: https://github.com/rust-lang/rust/pull/48628
1269 [48629]: https://github.com/rust-lang/rust/pull/48629
1270 [48657]: https://github.com/rust-lang/rust/pull/48657
1271 [48735]: https://github.com/rust-lang/rust/pull/48735
1272 [48978]: https://github.com/rust-lang/rust/pull/48978
1273 [49101]: https://github.com/rust-lang/rust/pull/49101
1274 [49109]: https://github.com/rust-lang/rust/pull/49109
1275 [49121]: https://github.com/rust-lang/rust/pull/49121
1276 [49162]: https://github.com/rust-lang/rust/pull/49162
1277 [49184]: https://github.com/rust-lang/rust/pull/49184
1278 [49234]: https://github.com/rust-lang/rust/pull/49234
1279 [49255]: https://github.com/rust-lang/rust/pull/49255
1280 [49299]: https://github.com/rust-lang/rust/pull/49299
1281 [49305]: https://github.com/rust-lang/rust/pull/49305
1282 [49394]: https://github.com/rust-lang/rust/pull/49394
1283 [49458]: https://github.com/rust-lang/rust/pull/49458
1284 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1285 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1286 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1287 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1288 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1289 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1290 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1291 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1292 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1293 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1294 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1295 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1296 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1297 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1298 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1299 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1300 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1301 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1302 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1303 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1304 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1305 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1306 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1307 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1308 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1309 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1310 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1311 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1312 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1313 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1314 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1315 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1316 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1317 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1318 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1319 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1320 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1321 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1322 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1323 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1324 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1325 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1328 Version 1.25.0 (2018-03-29)
1329 ==========================
1333 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1334 - [You can now use nested groups of imports.][47948]
1335 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1336 - [You can now have `|` at the start of a match arm.][47947] e.g.
1338 enum Foo { A, B, C }
1344 | Foo::B => println!("AB"),
1345 | Foo::C => println!("C"),
1352 - [Upgraded to LLVM 6.][47828]
1353 - [Added `-C lto=val` option.][47521]
1354 - [Added `i586-unknown-linux-musl` target][47282]
1358 - [Impl Send for `process::Command` on Unix.][47760]
1359 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1360 - [`UnsafeCell::into_inner` is now safe.][47204]
1361 - [Implement libstd for CloudABI.][47268]
1362 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1363 - [Implement `AsRef<Path>` for Component][46985]
1364 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1365 - [Moved `Duration` to libcore.][46666]
1369 - [`Location::column`]
1372 The following functions can now be used in a constant expression.
1373 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1374 - [`Duration::new`][47300]
1375 - [`Duration::from_secs`][47300]
1376 - [`Duration::from_millis`][47300]
1380 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1381 - [`cargo new` now defaults to creating a binary crate, instead of a
1382 library crate.][cargo/5029]
1386 - [Rust by example is now shipped with new releases][46196]
1390 - [Deprecated `net::lookup_host`.][47510]
1391 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1392 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1393 around indexing operations (see [#47349][47349]). This has been fixed (which also
1394 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1395 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1397 [33903]: https://github.com/rust-lang/rust/pull/33903
1398 [47947]: https://github.com/rust-lang/rust/pull/47947
1399 [47948]: https://github.com/rust-lang/rust/pull/47948
1400 [47760]: https://github.com/rust-lang/rust/pull/47760
1401 [47790]: https://github.com/rust-lang/rust/pull/47790
1402 [47828]: https://github.com/rust-lang/rust/pull/47828
1403 [47398]: https://github.com/rust-lang/rust/pull/47398
1404 [47510]: https://github.com/rust-lang/rust/pull/47510
1405 [47521]: https://github.com/rust-lang/rust/pull/47521
1406 [47204]: https://github.com/rust-lang/rust/pull/47204
1407 [47251]: https://github.com/rust-lang/rust/pull/47251
1408 [47268]: https://github.com/rust-lang/rust/pull/47268
1409 [47282]: https://github.com/rust-lang/rust/pull/47282
1410 [47300]: https://github.com/rust-lang/rust/pull/47300
1411 [47349]: https://github.com/rust-lang/rust/pull/47349
1412 [46931]: https://github.com/rust-lang/rust/pull/46931
1413 [46985]: https://github.com/rust-lang/rust/pull/46985
1414 [47006]: https://github.com/rust-lang/rust/pull/47006
1415 [46830]: https://github.com/rust-lang/rust/pull/46830
1416 [46095]: https://github.com/rust-lang/rust/pull/46095
1417 [46666]: https://github.com/rust-lang/rust/pull/46666
1418 [46196]: https://github.com/rust-lang/rust/pull/46196
1419 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1420 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1421 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1422 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1423 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1426 Version 1.24.1 (2018-03-01)
1427 ==========================
1429 - [Do not abort when unwinding through FFI][48251]
1430 - [Emit UTF-16 files for linker arguments on Windows][48318]
1431 - [Make the error index generator work again][48308]
1432 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1434 [48251]: https://github.com/rust-lang/rust/issues/48251
1435 [48308]: https://github.com/rust-lang/rust/issues/48308
1436 [48318]: https://github.com/rust-lang/rust/issues/48318
1437 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1440 Version 1.24.0 (2018-02-15)
1441 ==========================
1445 - [External `sysv64` ffi is now available.][46528]
1446 eg. `extern "sysv64" fn foo () {}`
1450 - [rustc now uses 16 codegen units by default for release builds.][46910]
1451 For the fastest builds, utilize `codegen-units=1`.
1452 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1453 - [Add `aarch64-unknown-openbsd` support][46760]
1457 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1458 improvement in performance in the majority of cases.
1459 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1460 with Windows.][46798]
1461 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1462 - [impl `From<bool>` for `AtomicBool`][46293]
1463 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1464 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1465 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1466 - [float::from_bits now just uses transmute.][46012] This provides
1467 some optimisations from LLVM.
1468 - [Copied `AsciiExt` methods onto `char`][46077]
1469 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1470 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1471 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1472 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1476 - [`RefCell::replace`]
1478 - [`atomic::spin_loop_hint`]
1480 The following functions can now be used in a constant expression.
1481 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1483 - [`AtomicBool::new`][46287]
1484 - [`AtomicUsize::new`][46287]
1485 - [`AtomicIsize::new`][46287]
1486 - [`AtomicPtr::new`][46287]
1487 - [`Cell::new`][46287]
1488 - [`{integer}::min_value`][46287]
1489 - [`{integer}::max_value`][46287]
1490 - [`mem::size_of`][46287]
1491 - [`mem::align_of`][46287]
1492 - [`ptr::null`][46287]
1493 - [`ptr::null_mut`][46287]
1494 - [`RefCell::new`][46287]
1495 - [`UnsafeCell::new`][46287]
1499 - [Added a `workspace.default-members` config that
1500 overrides implied `--all` in virtual workspaces.][cargo/4743]
1501 - [Enable incremental by default on development builds.][cargo/4817] Also added
1502 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1503 per-project or global basis respectively.
1510 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1511 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1512 in accordance with IETF RFC 4291 §2.2.
1513 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1514 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1515 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1516 - [Leading zeros in tuple struct members is now an error][47084]
1517 - [`column!()` macro is one-based instead of zero-based][46977]
1518 - [`fmt::Arguments` can no longer be shared across threads][45198]
1519 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1520 - [Cargo sets a different working directory for the compiler][cargo/4788]
1522 [44884]: https://github.com/rust-lang/rust/pull/44884
1523 [45198]: https://github.com/rust-lang/rust/pull/45198
1524 [45506]: https://github.com/rust-lang/rust/pull/45506
1525 [45904]: https://github.com/rust-lang/rust/pull/45904
1526 [45990]: https://github.com/rust-lang/rust/pull/45990
1527 [46012]: https://github.com/rust-lang/rust/pull/46012
1528 [46077]: https://github.com/rust-lang/rust/pull/46077
1529 [46094]: https://github.com/rust-lang/rust/pull/46094
1530 [46284]: https://github.com/rust-lang/rust/pull/46284
1531 [46287]: https://github.com/rust-lang/rust/pull/46287
1532 [46293]: https://github.com/rust-lang/rust/pull/46293
1533 [46528]: https://github.com/rust-lang/rust/pull/46528
1534 [46671]: https://github.com/rust-lang/rust/pull/46671
1535 [46713]: https://github.com/rust-lang/rust/pull/46713
1536 [46735]: https://github.com/rust-lang/rust/pull/46735
1537 [46749]: https://github.com/rust-lang/rust/pull/46749
1538 [46760]: https://github.com/rust-lang/rust/pull/46760
1539 [46798]: https://github.com/rust-lang/rust/pull/46798
1540 [46828]: https://github.com/rust-lang/rust/pull/46828
1541 [46831]: https://github.com/rust-lang/rust/pull/46831
1542 [46833]: https://github.com/rust-lang/rust/pull/46833
1543 [46910]: https://github.com/rust-lang/rust/pull/46910
1544 [46977]: https://github.com/rust-lang/rust/pull/46977
1545 [47018]: https://github.com/rust-lang/rust/pull/47018
1546 [47080]: https://github.com/rust-lang/rust/pull/47080
1547 [47084]: https://github.com/rust-lang/rust/pull/47084
1548 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1549 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1550 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1551 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1552 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1553 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1556 Version 1.23.0 (2018-01-04)
1557 ==========================
1561 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1562 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1563 Which should fix some confusing errors in some operations.
1567 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1568 undefined behavior.][45920]
1569 - [rustc now suggests renaming import if names clash.][45660]
1570 - [Display errors/warnings correctly when there are zero-width or
1571 wide characters.][45711]
1572 - [rustc now avoids unnecessary copies of arguments that are
1573 simple bindings][45380] This should improve memory usage on average by 5-10%.
1574 - [Updated musl used to build musl rustc to 1.1.17][45393]
1578 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1579 - [Implement Hash for raw pointers to unsized types][45483]
1580 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1581 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1582 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1583 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1584 and `<*mut T>::as_mut`][44932]
1585 - [Optimized `Thread::{park, unpark}` implementation][45524]
1586 - [Improved `SliceExt::binary_search` performance.][45333]
1587 - [impl `FromIterator<()>` for `()`][45379]
1588 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1596 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1597 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1598 - [Added unit test checking to `cargo check`][cargo/4592]
1599 - [Cargo now lets you install a specific version
1600 using `cargo install --version`][cargo/4637]
1604 - [Releases now ship with the Cargo book documentation.][45692]
1605 - [rustdoc now prints rendering warnings on every run.][45324]
1609 - [Changes have been made to type equality to make it more correct,
1610 in rare cases this could break some code.][45853] [Tracking issue for
1611 further information][45852]
1612 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1613 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1614 Android 9, the minimum supported version is Android 14.
1615 - [Bumped the minimum LLVM to 3.9][45326]
1617 [44042]: https://github.com/rust-lang/rust/pull/44042
1618 [44932]: https://github.com/rust-lang/rust/pull/44932
1619 [45267]: https://github.com/rust-lang/rust/pull/45267
1620 [45324]: https://github.com/rust-lang/rust/pull/45324
1621 [45326]: https://github.com/rust-lang/rust/pull/45326
1622 [45333]: https://github.com/rust-lang/rust/pull/45333
1623 [45379]: https://github.com/rust-lang/rust/pull/45379
1624 [45380]: https://github.com/rust-lang/rust/pull/45380
1625 [45393]: https://github.com/rust-lang/rust/pull/45393
1626 [45435]: https://github.com/rust-lang/rust/pull/45435
1627 [45483]: https://github.com/rust-lang/rust/pull/45483
1628 [45524]: https://github.com/rust-lang/rust/pull/45524
1629 [45571]: https://github.com/rust-lang/rust/pull/45571
1630 [45580]: https://github.com/rust-lang/rust/pull/45580
1631 [45610]: https://github.com/rust-lang/rust/pull/45610
1632 [45660]: https://github.com/rust-lang/rust/pull/45660
1633 [45692]: https://github.com/rust-lang/rust/pull/45692
1634 [45711]: https://github.com/rust-lang/rust/pull/45711
1635 [45772]: https://github.com/rust-lang/rust/pull/45772
1636 [45852]: https://github.com/rust-lang/rust/issues/45852
1637 [45853]: https://github.com/rust-lang/rust/pull/45853
1638 [45887]: https://github.com/rust-lang/rust/pull/45887
1639 [45920]: https://github.com/rust-lang/rust/pull/45920
1640 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1641 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1642 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1645 Version 1.22.1 (2017-11-22)
1646 ==========================
1648 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1650 [46183]: https://github.com/rust-lang/rust/pull/46183
1652 Version 1.22.0 (2017-11-22)
1653 ==========================
1657 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1658 - [Now accepts underscores in unicode escapes][43716]
1659 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1660 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1664 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1665 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1666 This should decrease compile times for debug builds.
1667 - [strict memory alignment now enabled on ARMv6][45094]
1668 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1672 - [Allow atomic operations up to 32 bits
1673 on `armv5te_unknown_linux_gnueabi`][44978]
1674 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1675 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1676 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1677 - [Properly detect overflow in `Instant += Duration`.][44220]
1678 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1679 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1680 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1687 - [Cargo will now build multi file examples in subdirectories of the `examples`
1688 folder that have a `main.rs` file.][cargo/4496]
1689 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1690 the old format will continue to work and can be updated with `cargo update`.
1691 - [Now supports vendoring git repositories][cargo/3992]
1695 - [`libbacktrace` is now available on Apple platforms.][44251]
1696 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1697 This now lets you specify that a given code example will fail to compile.
1701 - [The minimum Android version that rustc can build for has been bumped
1702 to `4.0` from `2.3`][45656]
1703 - [Allowing `T op= &T` for numeric types has broken some type
1704 inference cases][45480]
1707 [42526]: https://github.com/rust-lang/rust/pull/42526
1708 [43017]: https://github.com/rust-lang/rust/pull/43017
1709 [43716]: https://github.com/rust-lang/rust/pull/43716
1710 [43949]: https://github.com/rust-lang/rust/pull/43949
1711 [44015]: https://github.com/rust-lang/rust/pull/44015
1712 [44220]: https://github.com/rust-lang/rust/pull/44220
1713 [44251]: https://github.com/rust-lang/rust/pull/44251
1714 [44287]: https://github.com/rust-lang/rust/pull/44287
1715 [44303]: https://github.com/rust-lang/rust/pull/44303
1716 [44456]: https://github.com/rust-lang/rust/pull/44456
1717 [44466]: https://github.com/rust-lang/rust/pull/44466
1718 [44895]: https://github.com/rust-lang/rust/pull/44895
1719 [44966]: https://github.com/rust-lang/rust/pull/44966
1720 [44978]: https://github.com/rust-lang/rust/pull/44978
1721 [45041]: https://github.com/rust-lang/rust/pull/45041
1722 [45064]: https://github.com/rust-lang/rust/pull/45064
1723 [45075]: https://github.com/rust-lang/rust/pull/45075
1724 [45094]: https://github.com/rust-lang/rust/pull/45094
1725 [45095]: https://github.com/rust-lang/rust/pull/45095
1726 [45480]: https://github.com/rust-lang/rust/issues/45480
1727 [45656]: https://github.com/rust-lang/rust/pull/45656
1728 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1729 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1730 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1737 Version 1.21.0 (2017-10-12)
1738 ==========================
1742 - [You can now use static references for literals.][43838]
1746 let x: &'static u32 = &0;
1749 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1752 my_macro!(Vec<i32>::new); // Always worked
1753 my_macro!(Vec::<i32>::new); // Now works
1758 - [Upgraded jemalloc to 4.5.0][43911]
1759 - [Enabled unwinding panics on Redox][43917]
1760 - [Now runs LLVM in parallel during translation phase.][43506]
1761 This should reduce peak memory usage.
1765 - [Generate builtin impls for `Clone` for all arrays and tuples that
1766 are `T: Clone`][43690]
1767 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1768 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1769 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1774 [`std::mem::discriminant`]
1778 - [You can now call `cargo install` with multiple package names][cargo/4216]
1779 - [Cargo commands inside a virtual workspace will now implicitly
1780 pass `--all`][cargo/4335]
1781 - [Added a `[patch]` section to `Cargo.toml` to handle
1782 prepublication dependencies][cargo/4123] [RFC 1969]
1783 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1784 like patterns][cargo/4270]
1785 - [Added the `--all-targets` option][cargo/4400]
1786 - [Using required dependencies as a feature is now deprecated and emits
1787 a warning][cargo/4364]
1792 - [Cargo docs are moving][43916]
1793 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1794 - [The rustdoc book is now available][43863]
1795 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1796 - [Added a preview of RLS has been made available through rustup][44204]
1797 Install with `rustup component add rls-preview`
1798 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1799 Previously only showed `std::os::unix`.
1803 - [Changes in method matching against higher-ranked types][43880] This may cause
1804 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1805 - [rustc's JSON error output's byte position start at top of file.][42973]
1806 Was previously relative to the rustc's internal `CodeMap` struct which
1807 required the unstable library `libsyntax` to correctly use.
1808 - [`unused_results` lint no longer ignores booleans][43728]
1810 [42565]: https://github.com/rust-lang/rust/pull/42565
1811 [42973]: https://github.com/rust-lang/rust/pull/42973
1812 [43348]: https://github.com/rust-lang/rust/pull/43348
1813 [43459]: https://github.com/rust-lang/rust/pull/43459
1814 [43506]: https://github.com/rust-lang/rust/pull/43506
1815 [43540]: https://github.com/rust-lang/rust/pull/43540
1816 [43690]: https://github.com/rust-lang/rust/pull/43690
1817 [43728]: https://github.com/rust-lang/rust/pull/43728
1818 [43838]: https://github.com/rust-lang/rust/pull/43838
1819 [43863]: https://github.com/rust-lang/rust/pull/43863
1820 [43880]: https://github.com/rust-lang/rust/pull/43880
1821 [43911]: https://github.com/rust-lang/rust/pull/43911
1822 [43916]: https://github.com/rust-lang/rust/pull/43916
1823 [43917]: https://github.com/rust-lang/rust/pull/43917
1824 [44204]: https://github.com/rust-lang/rust/pull/44204
1825 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1826 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1827 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1828 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1829 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1830 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1831 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1832 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1833 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1835 Version 1.20.0 (2017-08-31)
1836 ===========================
1840 - [Associated constants are now stabilised.][42809]
1841 - [A lot of macro bugs are now fixed.][42913]
1846 - [Struct fields are now properly coerced to the expected field type.][42807]
1847 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1848 `wasm32-experimental-emscripten` target.
1849 - [Changed some of the error messages to be more helpful.][42033]
1850 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1852 - [rustc now reports the total number of errors on compilation failure][43015]
1853 previously this was only the number of errors in the pass that failed.
1854 - [Expansion in rustc has been sped up 29x.][42533]
1855 - [added `msp430-none-elf` target.][43099]
1856 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1858 - [Fixes backtraces on Redox][43228]
1859 - [rustc now identifies different versions of same crate when absolute paths of
1860 different types match in an error message.][42826]
1866 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1867 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1869 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1870 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1871 - [Impl `Clone` for `DefaultHasher`.][42799]
1872 - [Impl `Sync` for `SyncSender`.][42397]
1873 - [Impl `FromStr` for `char`][42271]
1874 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1876 - [allow messages in the `unimplemented!()` macro.][42155]
1877 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1878 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1879 - [Upgrade to Unicode 10.0.0][42999]
1880 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1881 - [Skip the main thread's manual stack guard on Linux][43072]
1882 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1883 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1885 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1890 - [`CStr::into_c_string`]
1891 - [`CString::as_c_str`]
1892 - [`CString::into_boxed_c_str`]
1893 - [`Chain::get_mut`]
1894 - [`Chain::get_ref`]
1895 - [`Chain::into_inner`]
1896 - [`Option::get_or_insert_with`]
1897 - [`Option::get_or_insert`]
1898 - [`OsStr::into_os_string`]
1899 - [`OsString::into_boxed_os_str`]
1902 - [`Utf8Error::error_len`]
1903 - [`char::EscapeDebug`]
1904 - [`char::escape_debug`]
1905 - [`compile_error!`]
1906 - [`f32::from_bits`]
1908 - [`f64::from_bits`]
1910 - [`mem::ManuallyDrop`]
1911 - [`slice::sort_unstable_by_key`]
1912 - [`slice::sort_unstable_by`]
1913 - [`slice::sort_unstable`]
1914 - [`str::from_boxed_utf8_unchecked`]
1915 - [`str::as_bytes_mut`]
1916 - [`str::as_bytes_mut`]
1917 - [`str::from_utf8_mut`]
1918 - [`str::from_utf8_unchecked_mut`]
1920 - [`str::get_unchecked_mut`]
1921 - [`str::get_unchecked`]
1923 - [`str::into_boxed_bytes`]
1928 - [Cargo API token location moved from `~/.cargo/config` to
1929 `~/.cargo/credentials`.][cargo/3978]
1930 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1931 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1932 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1933 - [You can now specify version of a binary when installed through
1934 `cargo install` using `--vers`.][cargo/4229]
1935 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1936 failure.][cargo/4248]
1937 - [Changed the convention around which file is the crate root.][cargo/4259]
1938 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1939 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1944 - [Functions with `'static` in their return types will now not be as usable as
1945 if they were using lifetime parameters instead.][42417]
1946 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1947 takes the sign of NaN into account where previously didn't.][42430]
1949 [42033]: https://github.com/rust-lang/rust/pull/42033
1950 [42155]: https://github.com/rust-lang/rust/pull/42155
1951 [42271]: https://github.com/rust-lang/rust/pull/42271
1952 [42397]: https://github.com/rust-lang/rust/pull/42397
1953 [42417]: https://github.com/rust-lang/rust/pull/42417
1954 [42430]: https://github.com/rust-lang/rust/pull/42430
1955 [42431]: https://github.com/rust-lang/rust/pull/42431
1956 [42533]: https://github.com/rust-lang/rust/pull/42533
1957 [42571]: https://github.com/rust-lang/rust/pull/42571
1958 [42613]: https://github.com/rust-lang/rust/pull/42613
1959 [42799]: https://github.com/rust-lang/rust/pull/42799
1960 [42807]: https://github.com/rust-lang/rust/pull/42807
1961 [42809]: https://github.com/rust-lang/rust/pull/42809
1962 [42822]: https://github.com/rust-lang/rust/pull/42822
1963 [42826]: https://github.com/rust-lang/rust/pull/42826
1964 [42854]: https://github.com/rust-lang/rust/pull/42854
1965 [42913]: https://github.com/rust-lang/rust/pull/42913
1966 [42999]: https://github.com/rust-lang/rust/pull/42999
1967 [43011]: https://github.com/rust-lang/rust/pull/43011
1968 [43015]: https://github.com/rust-lang/rust/pull/43015
1969 [43072]: https://github.com/rust-lang/rust/pull/43072
1970 [43077]: https://github.com/rust-lang/rust/pull/43077
1971 [43097]: https://github.com/rust-lang/rust/pull/43097
1972 [43099]: https://github.com/rust-lang/rust/pull/43099
1973 [43170]: https://github.com/rust-lang/rust/pull/43170
1974 [43178]: https://github.com/rust-lang/rust/pull/43178
1975 [43185]: https://github.com/rust-lang/rust/pull/43185
1976 [43228]: https://github.com/rust-lang/rust/pull/43228
1977 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1978 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1979 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1980 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1981 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1982 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1983 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1984 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1985 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1986 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1987 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1988 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1989 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1990 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1991 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1992 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1993 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1994 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1995 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1996 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1997 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1998 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1999 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2000 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
2001 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
2002 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
2003 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
2004 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
2005 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
2006 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
2007 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
2008 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
2009 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
2010 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
2011 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
2012 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
2013 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
2014 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
2015 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
2018 Version 1.19.0 (2017-07-20)
2019 ===========================
2024 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
2025 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
2026 - [Macro recursion limit increased to 1024 from 64.][41676]
2027 - [Added lint for detecting unused macros.][41907]
2028 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
2029 For example: `let x = loop { break 7; };`
2030 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
2031 contain `Copy` types and cannot have a `Drop` implementation.
2032 Example: `union Foo { bar: u8, baz: usize }`
2033 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
2034 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
2039 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
2040 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
2041 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
2042 you should use `--target armv7-linux-androideabi`.
2043 - [Fixed ICE when removing a source file between compilation sessions.][41873]
2044 - [Minor optimisation of string operations.][42037]
2045 - [Compiler error message is now `aborting due to previous error(s)` instead of
2046 `aborting due to N previous errors`][42150] This was previously inaccurate and
2047 would only count certain kinds of errors.
2048 - [The compiler now supports Visual Studio 2017][42225]
2049 - [The compiler is now built against LLVM 4.0.1 by default][42948]
2050 - [Added a lot][42264] of [new error codes][42302]
2051 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
2052 libraries with C Run-time Libraries(CRT) to be statically linked.
2053 - [Fixed various ARM codegen bugs][42740]
2058 - [`String` now implements `FromIterator<Cow<'a, str>>` and
2059 `Extend<Cow<'a, str>>`][41449]
2060 - [`Vec` now implements `From<&mut [T]>`][41530]
2061 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
2062 - [`SplitWhitespace` now implements `Clone`][41659]
2063 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
2065 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
2066 macros, but for printing to stderr.
2071 - [`OsString::shrink_to_fit`]
2074 - [`thread::ThreadId`]
2079 - [Build scripts can now add environment variables to the environment
2080 the crate is being compiled in.
2081 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
2082 - [Subcommands now replace the current process rather than spawning a new
2083 child process][cargo/3970]
2084 - [Workspace members can now accept glob file patterns][cargo/3979]
2085 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
2086 the members in a given workspace.][cargo/3988]
2087 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
2088 - [Target directory path is now in the cargo metadata][cargo/4022]
2089 - [Cargo no longer checks out a local working directory for the
2090 crates.io index][cargo/4026] This should provide smaller file size for the
2091 registry, and improve cloning times, especially on Windows machines.
2092 - [Added an `--exclude` option for excluding certain packages when using the
2093 `--all` option][cargo/4031]
2094 - [Cargo will now automatically retry when receiving a 5xx error
2095 from crates.io][cargo/4032]
2096 - [The `--features` option now accepts multiple comma or space
2097 delimited values.][cargo/4084]
2098 - [Added support for custom target specific runners][cargo/3954]
2103 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
2105 - [Rust will now release XZ compressed packages][rust-installer/57]
2106 - [rustup will now prefer to download rust packages with
2107 XZ compression][rustup/1100] over GZip packages.
2108 - [Added the ability to escape `#` in rust documentation][41785] By adding
2109 additional `#`'s ie. `##` is now `#`
2114 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
2115 - [`-Z` flags are now no longer allowed to be used on the stable
2116 compiler.][41751] This has been a warning for a year previous to this.
2117 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
2118 longer works][42844]. Users should migrate to the built-in `check`
2119 command, which has been available since 1.16.
2120 - [Ending a float literal with `._` is now a hard error.
2121 Example: `42._` .][41946]
2122 - [Any use of a private `extern crate` outside of its module is now a
2123 hard error.][36886] This was previously a warning.
2124 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
2125 relative while the `::` prefix makes a path absolute, but was ignored and the
2126 path was relative regardless.
2127 - [Floating point constants in match patterns is now a hard error][36890]
2128 This was previously a warning.
2129 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2130 match patterns is now a hard error][36891] This was previously a warning.
2131 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2133 - [From the pound escape, lines consisting of multiple `#`s are
2135 - [It is an error to re-export private enum variants][42460]. This is
2136 known to break a number of crates that depend on an older version of
2138 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2139 to use it to find the linker, and the build will fail where it did
2140 not previously][42607]
2142 [36886]: https://github.com/rust-lang/rust/issues/36886
2143 [36888]: https://github.com/rust-lang/rust/issues/36888
2144 [36890]: https://github.com/rust-lang/rust/issues/36890
2145 [36891]: https://github.com/rust-lang/rust/issues/36891
2146 [36892]: https://github.com/rust-lang/rust/issues/36892
2147 [37406]: https://github.com/rust-lang/rust/issues/37406
2148 [39983]: https://github.com/rust-lang/rust/pull/39983
2149 [41145]: https://github.com/rust-lang/rust/pull/41145
2150 [41192]: https://github.com/rust-lang/rust/pull/41192
2151 [41258]: https://github.com/rust-lang/rust/pull/41258
2152 [41370]: https://github.com/rust-lang/rust/pull/41370
2153 [41449]: https://github.com/rust-lang/rust/pull/41449
2154 [41530]: https://github.com/rust-lang/rust/pull/41530
2155 [41624]: https://github.com/rust-lang/rust/pull/41624
2156 [41656]: https://github.com/rust-lang/rust/pull/41656
2157 [41659]: https://github.com/rust-lang/rust/pull/41659
2158 [41676]: https://github.com/rust-lang/rust/pull/41676
2159 [41751]: https://github.com/rust-lang/rust/pull/41751
2160 [41764]: https://github.com/rust-lang/rust/pull/41764
2161 [41785]: https://github.com/rust-lang/rust/pull/41785
2162 [41873]: https://github.com/rust-lang/rust/pull/41873
2163 [41907]: https://github.com/rust-lang/rust/pull/41907
2164 [41946]: https://github.com/rust-lang/rust/pull/41946
2165 [42016]: https://github.com/rust-lang/rust/pull/42016
2166 [42037]: https://github.com/rust-lang/rust/pull/42037
2167 [42068]: https://github.com/rust-lang/rust/pull/42068
2168 [42150]: https://github.com/rust-lang/rust/pull/42150
2169 [42162]: https://github.com/rust-lang/rust/pull/42162
2170 [42225]: https://github.com/rust-lang/rust/pull/42225
2171 [42264]: https://github.com/rust-lang/rust/pull/42264
2172 [42302]: https://github.com/rust-lang/rust/pull/42302
2173 [42460]: https://github.com/rust-lang/rust/issues/42460
2174 [42607]: https://github.com/rust-lang/rust/issues/42607
2175 [42740]: https://github.com/rust-lang/rust/pull/42740
2176 [42844]: https://github.com/rust-lang/rust/issues/42844
2177 [42948]: https://github.com/rust-lang/rust/pull/42948
2178 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2179 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2180 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2181 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2182 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2183 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2184 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2185 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2186 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2187 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2188 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2189 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2190 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2191 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2192 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2193 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2194 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2195 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2196 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2197 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2198 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2199 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2202 Version 1.18.0 (2017-06-08)
2203 ===========================
2208 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2209 make the item visible to just that module tree. Also accepts the keyword
2210 `crate` to make something public to the whole crate but not users of the
2211 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2212 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2213 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2214 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2215 types like `Write + Send`, trailing `+` are now supported in trait objects,
2216 and better error reporting for trait objects starting with `?Sized`.
2217 - [0e+10 is now a valid floating point literal][40589]
2218 - [Now warns if you bind a lifetime parameter to 'static][40734]
2219 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2220 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2221 representation in some cases.][40377]
2226 - [rustc can now emit mir with `--emit mir`][39891]
2227 - [Improved LLVM IR for trivial functions][40367]
2228 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2229 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2230 opportunities found through profiling
2231 - [Improved backtrace formatting when panicking][38165]
2236 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2237 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2238 iteration or reallocation.
2239 - [Simplified HashMap Bucket interface][40561] provides performance
2240 improvements for iterating and cloning.
2241 - [Specialize Vec::from_elem to use calloc][40409]
2242 - [Fixed Race condition in fs::create_dir_all][39799]
2243 - [No longer caching stdio on Windows][40516]
2244 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2245 2.50%~ faster and in one case now 12.50% faster.
2246 - [Optimized `AtomicBool::fetch_nand`][41143]
2251 - [`Child::try_wait`]
2252 - [`HashMap::retain`]
2253 - [`HashSet::retain`]
2255 - [`TcpStream::peek`]
2256 - [`UdpSocket::peek`]
2257 - [`UdpSocket::peek_from`]
2262 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2263 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2264 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2265 - [Added Android build support][cargo/3885]
2266 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2267 of a certain type, for example `cargo build --bins` will build all
2269 - [Added support for haiku][cargo/3952]
2274 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2275 - [Added rust-windbg script for better debugging on Windows][39983]
2276 - [Rust now uses the official cross compiler for NetBSD][40612]
2277 - [rustdoc now accepts `#` at the start of files][40828]
2278 - [Fixed jemalloc support for musl][41168]
2283 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2284 always placed after the sign if it exists and before the digits. With the `#`
2285 flag the zeroes are placed after the prefix and before the digits.
2286 - [Due to the struct field optimisation][40377], using `transmute` on structs
2287 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2288 always been undefined behavior, but is now more likely to break in practice.
2289 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2290 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2291 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2292 - [Overlapping inherent `impl`s are now a hard error][40728]
2293 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2294 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2295 `out.asm` and `out.ll` instead of only one of the filetypes.
2296 - [ calling a function that returns `Self` will no longer work][41805] when
2297 the size of `Self` cannot be statically determined.
2298 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2299 this has caused a few regressions namely:
2301 - Changed the link order of local static/dynamic libraries (respecting the
2302 order on given rather than having the compiler reorder).
2303 - Changed how MinGW is linked, native code linked to dynamic libraries
2304 may require manually linking to the gcc support library (for the native
2307 [38165]: https://github.com/rust-lang/rust/pull/38165
2308 [39799]: https://github.com/rust-lang/rust/pull/39799
2309 [39891]: https://github.com/rust-lang/rust/pull/39891
2310 [39983]: https://github.com/rust-lang/rust/pull/39983
2311 [40043]: https://github.com/rust-lang/rust/pull/40043
2312 [40241]: https://github.com/rust-lang/rust/pull/40241
2313 [40338]: https://github.com/rust-lang/rust/pull/40338
2314 [40367]: https://github.com/rust-lang/rust/pull/40367
2315 [40377]: https://github.com/rust-lang/rust/pull/40377
2316 [40409]: https://github.com/rust-lang/rust/pull/40409
2317 [40516]: https://github.com/rust-lang/rust/pull/40516
2318 [40556]: https://github.com/rust-lang/rust/pull/40556
2319 [40561]: https://github.com/rust-lang/rust/pull/40561
2320 [40589]: https://github.com/rust-lang/rust/pull/40589
2321 [40612]: https://github.com/rust-lang/rust/pull/40612
2322 [40723]: https://github.com/rust-lang/rust/pull/40723
2323 [40728]: https://github.com/rust-lang/rust/pull/40728
2324 [40731]: https://github.com/rust-lang/rust/pull/40731
2325 [40734]: https://github.com/rust-lang/rust/pull/40734
2326 [40805]: https://github.com/rust-lang/rust/pull/40805
2327 [40807]: https://github.com/rust-lang/rust/pull/40807
2328 [40828]: https://github.com/rust-lang/rust/pull/40828
2329 [40870]: https://github.com/rust-lang/rust/pull/40870
2330 [41085]: https://github.com/rust-lang/rust/pull/41085
2331 [41143]: https://github.com/rust-lang/rust/pull/41143
2332 [41168]: https://github.com/rust-lang/rust/pull/41168
2333 [41270]: https://github.com/rust-lang/rust/issues/41270
2334 [41469]: https://github.com/rust-lang/rust/pull/41469
2335 [41805]: https://github.com/rust-lang/rust/issues/41805
2336 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2337 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2338 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2339 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2340 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2341 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2342 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2343 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2344 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2345 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2346 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2347 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2348 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2349 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2352 Version 1.17.0 (2017-04-27)
2353 ===========================
2358 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2359 * [Fields of structs may be initialized without duplicating the field/variable
2360 names][39761]. [RFC 1682]
2361 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2362 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2363 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2364 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2365 `'b`. Soundness fix.
2366 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2367 * [Static variables may contain references to other statics][40027]
2372 * [Exit quickly on only `--emit dep-info`][40336]
2373 * [Make `-C relocation-model` more correctly determine whether the linker
2374 creates a position-independent executable][40245]
2375 * [Add `-C overflow-checks` to directly control whether integer overflow
2377 * [The rustc type checker now checks items on demand instead of in a single
2378 in-order pass][40008]. This is mostly an internal refactoring in support of
2379 future work, including incremental type checking, but also resolves [RFC
2380 1647], allowing `Self` to appear in `impl` `where` clauses.
2381 * [Optimize vtable loads][39995]
2382 * [Turn off vectorization for Emscripten targets][39990]
2383 * [Provide suggestions for unknown macros imported with `use`][39953]
2384 * [Fix ICEs in path resolution][39939]
2385 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2386 * [Add clearer error message using `&str + &str`][39116]
2397 * [`Ordering::then`]
2398 * [`Ordering::then_with`]
2399 * [`BTreeMap::range`]
2400 * [`BTreeMap::range_mut`]
2401 * [`collections::Bound`]
2402 * [`process::abort`]
2403 * [`ptr::read_unaligned`]
2404 * [`ptr::write_unaligned`]
2405 * [`Result::expect_err`]
2408 * [`Cell::into_inner`]
2414 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2415 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2416 * [`String` implements `FromIterator<&char>`][40028]
2417 * `Box` [implements][40009] a number of new conversions:
2418 `From<Box<str>> for String`,
2419 `From<Box<[T]>> for Vec<T>`,
2420 `From<Box<CStr>> for CString`,
2421 `From<Box<OsStr>> for OsString`,
2422 `From<Box<Path>> for PathBuf`,
2423 `Into<Box<str>> for String`,
2424 `Into<Box<[T]>> for Vec<T>`,
2425 `Into<Box<CStr>> for CString`,
2426 `Into<Box<OsStr>> for OsString`,
2427 `Into<Box<Path>> for PathBuf`,
2428 `Default for Box<str>`,
2429 `Default for Box<CStr>`,
2430 `Default for Box<OsStr>`,
2431 `From<&CStr> for Box<CStr>`,
2432 `From<&OsStr> for Box<OsStr>`,
2433 `From<&Path> for Box<Path>`
2434 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2435 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2436 * [Slightly optimize `slice::sort`][39538]
2437 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2438 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2439 `Box<str>` implements `From<&str>`][39438]
2440 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2441 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2442 * [`format!` estimates the needed capacity before writing a string][39356]
2443 * [Support unprivileged symlink creation in Windows][38921]
2444 * [`PathBuf` implements `Default`][38764]
2445 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2446 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2447 and poor hash functions.
2452 * [Add `cargo check --all`][cargo/3731]
2453 * [Add an option to ignore SSL revocation checking][cargo/3699]
2454 * [Add `cargo run --package`][cargo/3691]
2455 * [Add `required_features`][cargo/3667]
2456 * [Assume `build.rs` is a build script][cargo/3664]
2457 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2462 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2464 * [The "Unstable Book" documents nightly-only features][ubook]
2465 * [Improve the style of the sidebar in rustdoc output][40265]
2466 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2467 * [Fix MSP430 breakage due to `i128`][40257]
2468 * [Preliminary Solaris/SPARCv9 support][39903]
2469 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2470 run without installing the MSVC runtime.
2471 * [`rustdoc --test` includes file names in test names][39788]
2472 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2473 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2474 * [Initial support for `aarch64-unknown-freebsd`][39491]
2475 * [Initial support for `i686-unknown-netbsd`][39426]
2476 * [This release no longer includes the old makefile build system][39431]. Rust
2477 is built with a custom build system, written in Rust, and with Cargo.
2478 * [Add Debug implementations for libcollection structs][39002]
2479 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2480 * [`--test-threads=0` produces an error][38945]
2481 * [`rustup` installs documentation by default][40526]
2482 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2483 WinDbg and Visual Studio to improve the debugging experience.
2488 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2489 workaround, either use MSVC 2015 or run vcvars.bat.
2490 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2491 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2492 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2494 * [`format!` and `Display::to_string` panic if an underlying formatting
2495 implementation returns an error][40117]. Previously the error was silently
2496 ignored. It is incorrect for `write_fmt` to return an error when writing
2498 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2499 crates were marked stable and could be accessed from the stable toolchain.
2500 * [Rust git source no longer includes vendored crates][39728]. Those that need
2501 to build with vendored crates should build from release tarballs.
2502 * [Fix inert attributes from `proc_macro_derives`][39572]
2503 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2504 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2506 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2507 existing code generally ignores the type of dead-code unless a type-hint is
2508 provided; this can cause surprising inference interactions particularly around
2509 defaulting. The new code uniformly ignores the result type of dead-code.
2510 * [Tuple-struct constructors with private fields are no longer visible][38932]
2511 * [Lifetime parameters that do not appear in the arguments are now considered
2512 early-bound][38897], resolving a soundness bug (#[32330]). The
2513 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2515 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2516 * [Make transmuting from fn item types to pointer-sized types a hard
2519 [27787]: https://github.com/rust-lang/rust/issues/27787
2520 [32330]: https://github.com/rust-lang/rust/issues/32330
2521 [34198]: https://github.com/rust-lang/rust/pull/34198
2522 [38161]: https://github.com/rust-lang/rust/pull/38161
2523 [38368]: https://github.com/rust-lang/rust/pull/38368
2524 [38584]: https://github.com/rust-lang/rust/issues/38584
2525 [38661]: https://github.com/rust-lang/rust/pull/38661
2526 [38764]: https://github.com/rust-lang/rust/pull/38764
2527 [38864]: https://github.com/rust-lang/rust/issues/38864
2528 [38897]: https://github.com/rust-lang/rust/pull/38897
2529 [38921]: https://github.com/rust-lang/rust/pull/38921
2530 [38932]: https://github.com/rust-lang/rust/pull/38932
2531 [38945]: https://github.com/rust-lang/rust/pull/38945
2532 [38981]: https://github.com/rust-lang/rust/pull/38981
2533 [39002]: https://github.com/rust-lang/rust/pull/39002
2534 [39116]: https://github.com/rust-lang/rust/pull/39116
2535 [39193]: https://github.com/rust-lang/rust/pull/39193
2536 [39265]: https://github.com/rust-lang/rust/pull/39265
2537 [39356]: https://github.com/rust-lang/rust/pull/39356
2538 [39372]: https://github.com/rust-lang/rust/pull/39372
2539 [39426]: https://github.com/rust-lang/rust/pull/39426
2540 [39431]: https://github.com/rust-lang/rust/pull/39431
2541 [39438]: https://github.com/rust-lang/rust/pull/39438
2542 [39440]: https://github.com/rust-lang/rust/pull/39440
2543 [39485]: https://github.com/rust-lang/rust/pull/39485
2544 [39491]: https://github.com/rust-lang/rust/pull/39491
2545 [39518]: https://github.com/rust-lang/rust/pull/39518
2546 [39538]: https://github.com/rust-lang/rust/pull/39538
2547 [39572]: https://github.com/rust-lang/rust/pull/39572
2548 [39633]: https://github.com/rust-lang/rust/pull/39633
2549 [39642]: https://github.com/rust-lang/rust/pull/39642
2550 [39728]: https://github.com/rust-lang/rust/pull/39728
2551 [39761]: https://github.com/rust-lang/rust/pull/39761
2552 [39788]: https://github.com/rust-lang/rust/pull/39788
2553 [39793]: https://github.com/rust-lang/rust/pull/39793
2554 [39837]: https://github.com/rust-lang/rust/pull/39837
2555 [39843]: https://github.com/rust-lang/rust/pull/39843
2556 [39851]: https://github.com/rust-lang/rust/pull/39851
2557 [39903]: https://github.com/rust-lang/rust/pull/39903
2558 [39939]: https://github.com/rust-lang/rust/pull/39939
2559 [39953]: https://github.com/rust-lang/rust/pull/39953
2560 [39960]: https://github.com/rust-lang/rust/pull/39960
2561 [39990]: https://github.com/rust-lang/rust/pull/39990
2562 [39995]: https://github.com/rust-lang/rust/pull/39995
2563 [40008]: https://github.com/rust-lang/rust/pull/40008
2564 [40009]: https://github.com/rust-lang/rust/pull/40009
2565 [40027]: https://github.com/rust-lang/rust/pull/40027
2566 [40028]: https://github.com/rust-lang/rust/pull/40028
2567 [40037]: https://github.com/rust-lang/rust/pull/40037
2568 [40117]: https://github.com/rust-lang/rust/pull/40117
2569 [40166]: https://github.com/rust-lang/rust/pull/40166
2570 [40245]: https://github.com/rust-lang/rust/pull/40245
2571 [40257]: https://github.com/rust-lang/rust/pull/40257
2572 [40261]: https://github.com/rust-lang/rust/pull/40261
2573 [40265]: https://github.com/rust-lang/rust/pull/40265
2574 [40319]: https://github.com/rust-lang/rust/pull/40319
2575 [40336]: https://github.com/rust-lang/rust/pull/40336
2576 [40526]: https://github.com/rust-lang/rust/pull/40526
2577 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2578 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2579 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2580 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2581 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2582 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2583 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2584 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2585 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2586 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2587 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2588 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2589 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2590 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2591 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2592 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2593 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2594 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2595 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2596 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2597 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2598 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2599 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2600 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2601 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2602 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2603 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2604 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2605 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2606 [mdbook]: https://crates.io/crates/mdbook
2607 [ubook]: https://doc.rust-lang.org/unstable-book/
2610 Version 1.16.0 (2017-03-16)
2611 ===========================
2616 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2617 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2618 match patterns][38069]
2619 * [Clean up semantics of `self` in an import list][38313]
2620 * [`Self` may appear in `impl` headers][38920]
2621 * [`Self` may appear in struct expressions][39282]
2626 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2627 a `.rmeta` file containing only crate metadata][38571]. This can be
2628 used by tools like the Rust Language Service to perform
2629 metadata-only builds.
2630 * [Levenshtein based typo suggestions now work in most places, while
2631 previously they worked only for fields and sometimes for local
2632 variables][38927]. Together with the overhaul of "no
2633 resolution"/"unexpected resolution" errors (#[38154]) they result in
2634 large and systematic improvement in resolution diagnostics.
2635 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2637 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2638 * [`rustc` no longer attempts to provide "consider using an explicit
2639 lifetime" suggestions][37057]. They were inaccurate.
2644 * [`VecDeque::truncate`]
2645 * [`VecDeque::resize`]
2646 * [`String::insert_str`]
2647 * [`Duration::checked_add`]
2648 * [`Duration::checked_sub`]
2649 * [`Duration::checked_div`]
2650 * [`Duration::checked_mul`]
2653 * [`SocketAddr::is_ipv4`]
2654 * [`SocketAddr::is_ipv6`]
2655 * [`IpAddr::is_ipv4`]
2656 * [`IpAddr::is_ipv6`]
2658 * [`Vec::dedup_by_key`]
2659 * [`Result::unwrap_or_default`]
2660 * [`<*const T>::wrapping_offset`]
2661 * [`<*mut T>::wrapping_offset`]
2662 * `CommandExt::creation_flags`
2663 * [`File::set_permissions`]
2664 * [`String::split_off`]
2669 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2670 their argument by `Borrow` parameter][37761]
2671 * [All public types in std implement `Debug`][38006]
2672 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2673 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2674 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2676 * [std: Fix partial writes in `LineWriter`][38062]
2677 * [std: Clamp max read/write sizes on Unix][38062]
2678 * [Use more specific panic message for `&str` slicing errors][38066]
2679 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2680 functionality cannot be achieved in std currently.
2681 * [`writeln!`, like `println!`, now accepts a form with no string
2682 or formatting arguments, to just print a newline][38469]
2683 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2684 * [Reduce the size of static data in `std_unicode::tables`][38781]
2685 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2686 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2688 * [`Duration` implements `Sum`][38712]
2689 * [`String` implements `ToSocketAddrs`][39048]
2694 * [The `cargo check` command does a type check of a project without
2695 building it][cargo/3296]
2696 * [crates.io will display CI badges from Travis and AppVeyor, if
2697 specified in Cargo.toml][cargo/3546]
2698 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2699 * [Compilation profiles accept integer values for `debug`, in addition
2700 to `true` and `false`. These are passed to `rustc` as the value to
2701 `-C debuginfo`][cargo/3534]
2702 * [Implement `cargo --version --verbose`][cargo/3604]
2703 * [All builds now output 'dep-info' build dependencies compatible with
2704 make and ninja][cargo/3557]
2705 * [Build all workspace members with `build --all`][cargo/3511]
2706 * [Document all workspace members with `doc --all`][cargo/3515]
2707 * [Path deps outside workspace are not members][cargo/3443]
2712 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2713 the path to the Rust implementation][38589]
2714 * [The `armv7-linux-androideabi` target no longer enables NEON
2715 extensions, per Google's ABI guide][38413]
2716 * [The stock standard library can be compiled for Redox OS][38401]
2717 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2719 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2721 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2726 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2727 match patterns][38069]
2728 * In this release, references to uninhabited types can not be
2729 pattern-matched. This was accidentally allowed in 1.15.
2730 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2731 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2733 * [Clean up semantics of `self` in an import list][38313]
2734 * Reimplemented lifetime elision. This change was almost entirely compatible
2735 with existing code, but it did close a number of small bugs and loopholes,
2736 as well as being more accepting in some other [cases][41105].
2738 [37057]: https://github.com/rust-lang/rust/pull/37057
2739 [37761]: https://github.com/rust-lang/rust/pull/37761
2740 [38006]: https://github.com/rust-lang/rust/pull/38006
2741 [38051]: https://github.com/rust-lang/rust/pull/38051
2742 [38062]: https://github.com/rust-lang/rust/pull/38062
2743 [38062]: https://github.com/rust-lang/rust/pull/38622
2744 [38066]: https://github.com/rust-lang/rust/pull/38066
2745 [38069]: https://github.com/rust-lang/rust/pull/38069
2746 [38131]: https://github.com/rust-lang/rust/pull/38131
2747 [38154]: https://github.com/rust-lang/rust/pull/38154
2748 [38274]: https://github.com/rust-lang/rust/pull/38274
2749 [38304]: https://github.com/rust-lang/rust/pull/38304
2750 [38313]: https://github.com/rust-lang/rust/pull/38313
2751 [38314]: https://github.com/rust-lang/rust/pull/38314
2752 [38327]: https://github.com/rust-lang/rust/pull/38327
2753 [38401]: https://github.com/rust-lang/rust/pull/38401
2754 [38413]: https://github.com/rust-lang/rust/pull/38413
2755 [38469]: https://github.com/rust-lang/rust/pull/38469
2756 [38559]: https://github.com/rust-lang/rust/pull/38559
2757 [38571]: https://github.com/rust-lang/rust/pull/38571
2758 [38580]: https://github.com/rust-lang/rust/pull/38580
2759 [38589]: https://github.com/rust-lang/rust/pull/38589
2760 [38670]: https://github.com/rust-lang/rust/pull/38670
2761 [38712]: https://github.com/rust-lang/rust/pull/38712
2762 [38726]: https://github.com/rust-lang/rust/pull/38726
2763 [38781]: https://github.com/rust-lang/rust/pull/38781
2764 [38798]: https://github.com/rust-lang/rust/pull/38798
2765 [38909]: https://github.com/rust-lang/rust/pull/38909
2766 [38920]: https://github.com/rust-lang/rust/pull/38920
2767 [38927]: https://github.com/rust-lang/rust/pull/38927
2768 [39048]: https://github.com/rust-lang/rust/pull/39048
2769 [39282]: https://github.com/rust-lang/rust/pull/39282
2770 [39379]: https://github.com/rust-lang/rust/pull/39379
2771 [41105]: https://github.com/rust-lang/rust/issues/41105
2772 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2773 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2774 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2775 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2776 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2777 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2778 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2779 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2780 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2781 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2782 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2783 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2784 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2785 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2786 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2787 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2788 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2789 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2790 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2791 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2792 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2793 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2794 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2795 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2796 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2797 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2798 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2799 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2800 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2801 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2804 Version 1.15.1 (2017-02-09)
2805 ===========================
2807 * [Fix IntoIter::as_mut_slice's signature][39466]
2808 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2810 [39466]: https://github.com/rust-lang/rust/pull/39466
2811 [39523]: https://github.com/rust-lang/rust/pull/39523
2814 Version 1.15.0 (2017-02-02)
2815 ===========================
2820 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2821 stable. This allows popular code-generating crates like Serde and Diesel to
2822 work ergonomically. [RFC 1681].
2823 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2824 with curly braces][36868]. Part of [RFC 1506].
2825 * [A number of minor changes to name resolution have been activated][37127].
2826 They add up to more consistent semantics, allowing for future evolution of
2827 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2828 details of what is different. The breaking changes here have been transitioned
2829 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2830 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2832 * [`?Sized` can be used in `where` clauses][37791]
2833 * [There is now a limit on the size of monomorphized types and it can be
2834 modified with the `#![type_size_limit]` crate attribute, similarly to
2835 the `#![recursion_limit]` attribute][37789]
2840 * [On Windows, the compiler will apply dllimport attributes when linking to
2841 extern functions][37973]. Additional attributes and flags can control which
2842 library kind is linked and its name. [RFC 1717].
2843 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2844 * [The `--test` flag works with procedural macro crates][38107]
2845 * [Fix `extern "aapcs" fn` ABI][37814]
2846 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2847 * [The `format!` expander recognizes incorrect `printf` and shell-style
2848 formatting directives and suggests the correct format][37613].
2849 * [Only report one error for all unused imports in an import list][37456]
2851 Compiler Performance
2852 --------------------
2854 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2855 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2856 * [Don't clone in `UnificationTable::probe`][37848]
2857 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2858 * [Use small vectors in type walker][37760]
2859 * [Macro expansion performance was improved][37701]
2860 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2861 * [Replace FNV with a faster hash function][37229]
2866 * [`std::iter::Iterator::min_by`]
2867 * [`std::iter::Iterator::max_by`]
2868 * [`std::os::*::fs::FileExt`]
2869 * [`std::sync::atomic::Atomic*::get_mut`]
2870 * [`std::sync::atomic::Atomic*::into_inner`]
2871 * [`std::vec::IntoIter::as_slice`]
2872 * [`std::vec::IntoIter::as_mut_slice`]
2873 * [`std::sync::mpsc::Receiver::try_iter`]
2874 * [`std::os::unix::process::CommandExt::before_exec`]
2875 * [`std::rc::Rc::strong_count`]
2876 * [`std::rc::Rc::weak_count`]
2877 * [`std::sync::Arc::strong_count`]
2878 * [`std::sync::Arc::weak_count`]
2879 * [`std::char::encode_utf8`]
2880 * [`std::char::encode_utf16`]
2881 * [`std::cell::Ref::clone`]
2882 * [`std::io::Take::into_inner`]
2887 * [The standard sorting algorithm has been rewritten for dramatic performance
2888 improvements][38192]. It is a hybrid merge sort, drawing influences from
2889 Timsort. Previously it was a naive merge sort.
2890 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2891 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2893 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2894 and `char_indices().last()`][37882]
2895 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2896 * [Chinese characters display correctly in `fmt::Debug`][37855]
2897 * [Derive `Default` for `Duration`][37699]
2898 * [Support creation of anonymous pipes on WinXP/2k][37677]
2899 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2900 * [Don't pass overlapped handles to processes][38835]
2905 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2906 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2907 should instead check the variable at runtime with `std::env`. That the value
2908 was set at build time was a bug, and incorrect when cross-compiling. This
2909 change is known to cause breakage.
2910 * [Add `--all` flag to `cargo test`][cargo/3221]
2911 * [Compile statically against the MSVC CRT][cargo/3363]
2912 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2913 * [Link OpenSSL statically on OSX][cargo/3311]
2914 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2915 * [Test for bad path overrides with summaries][cargo/3336]
2916 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2917 * [Fix retrying crate downloads for network errors][cargo/3348]
2918 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2919 * [Emit more info on --message-format=json][cargo/3319]
2920 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2921 * [Don't ignore errors in workspace manifest][cargo/3409]
2922 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2927 * [Test runners (binaries built with `--test`) now support a `--list` argument
2928 that lists the tests it contains][38185]
2929 * [Test runners now support a `--exact` argument that makes the test filter
2930 match exactly, instead of matching only a substring of the test name][38181]
2931 * [rustdoc supports a `--playground-url` flag][37763]
2932 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2937 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2938 continue to be used in this release by passing `--disable-rustbuild` to the
2939 configure script, but they will be deleted soon. Note that the new build
2940 system uses a different on-disk layout that will likely affect any scripts
2942 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2944 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2945 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2951 * [A number of minor changes to name resolution have been activated][37127].
2952 They add up to more consistent semantics, allowing for future evolution of
2953 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2954 details of what is different. The breaking changes here have been transitioned
2955 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2956 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2957 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2958 should instead check the variable at runtime with `std::env`. That the value
2959 was set at build time was a bug, and incorrect when cross-compiling. This
2960 change is known to cause breakage.
2961 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2962 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2963 1.10 and is now an error by default. It will become a hard error in the near
2965 * [The semantics relating modules to file system directories are changing in
2966 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2967 lint, which is a warning in this release, and will become a hard error in the
2969 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2970 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2971 the underlying iterator][37834]
2973 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2974 [33685]: https://github.com/rust-lang/rust/issues/33685
2975 [36868]: https://github.com/rust-lang/rust/pull/36868
2976 [37127]: https://github.com/rust-lang/rust/pull/37127
2977 [37229]: https://github.com/rust-lang/rust/pull/37229
2978 [37456]: https://github.com/rust-lang/rust/pull/37456
2979 [37527]: https://github.com/rust-lang/rust/pull/37527
2980 [37602]: https://github.com/rust-lang/rust/pull/37602
2981 [37613]: https://github.com/rust-lang/rust/pull/37613
2982 [37615]: https://github.com/rust-lang/rust/pull/37615
2983 [37636]: https://github.com/rust-lang/rust/pull/37636
2984 [37627]: https://github.com/rust-lang/rust/pull/37627
2985 [37642]: https://github.com/rust-lang/rust/pull/37642
2986 [37677]: https://github.com/rust-lang/rust/pull/37677
2987 [37699]: https://github.com/rust-lang/rust/pull/37699
2988 [37701]: https://github.com/rust-lang/rust/pull/37701
2989 [37705]: https://github.com/rust-lang/rust/pull/37705
2990 [37749]: https://github.com/rust-lang/rust/pull/37749
2991 [37760]: https://github.com/rust-lang/rust/pull/37760
2992 [37763]: https://github.com/rust-lang/rust/pull/37763
2993 [37764]: https://github.com/rust-lang/rust/pull/37764
2994 [37789]: https://github.com/rust-lang/rust/pull/37789
2995 [37791]: https://github.com/rust-lang/rust/pull/37791
2996 [37814]: https://github.com/rust-lang/rust/pull/37814
2997 [37817]: https://github.com/rust-lang/rust/pull/37817
2998 [37834]: https://github.com/rust-lang/rust/pull/37834
2999 [37848]: https://github.com/rust-lang/rust/pull/37848
3000 [37855]: https://github.com/rust-lang/rust/pull/37855
3001 [37882]: https://github.com/rust-lang/rust/pull/37882
3002 [37888]: https://github.com/rust-lang/rust/pull/37888
3003 [37973]: https://github.com/rust-lang/rust/pull/37973
3004 [37979]: https://github.com/rust-lang/rust/pull/37979
3005 [38086]: https://github.com/rust-lang/rust/pull/38086
3006 [38107]: https://github.com/rust-lang/rust/pull/38107
3007 [38117]: https://github.com/rust-lang/rust/pull/38117
3008 [38134]: https://github.com/rust-lang/rust/pull/38134
3009 [38146]: https://github.com/rust-lang/rust/pull/38146
3010 [38181]: https://github.com/rust-lang/rust/pull/38181
3011 [38182]: https://github.com/rust-lang/rust/pull/38182
3012 [38185]: https://github.com/rust-lang/rust/pull/38185
3013 [38192]: https://github.com/rust-lang/rust/pull/38192
3014 [38279]: https://github.com/rust-lang/rust/pull/38279
3015 [38835]: https://github.com/rust-lang/rust/pull/38835
3016 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3017 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3018 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
3019 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
3020 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
3021 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
3022 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
3023 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
3024 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
3025 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
3026 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
3027 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
3028 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
3029 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
3030 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
3031 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
3032 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
3033 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
3034 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
3035 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
3036 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
3037 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
3038 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
3039 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
3040 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
3041 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
3042 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
3043 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
3044 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
3045 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
3046 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
3047 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
3048 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
3049 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
3050 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
3051 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
3052 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
3053 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
3056 Version 1.14.0 (2016-12-22)
3057 ===========================
3062 * [`..` matches multiple tuple fields in enum variants, structs
3063 and tuples][36843]. [RFC 1492].
3064 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
3065 * [`use *` and `use ::*` both glob-import from the crate root][37367]
3066 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
3067 dereferencing][36822]
3072 * [Mark enums with non-zero discriminant as non-zero][37224]
3073 * [Lower-case `static mut` names are linted like other
3074 statics and consts][37162]
3075 * [Fix ICE on some macros in const integer positions
3076 (e.g. `[u8; m!()]`)][36819]
3077 * [Improve error message and snippet for "did you mean `x`"][36798]
3078 * [Add a panic-strategy field to the target specification][36794]
3079 * [Include LLVM version in `--version --verbose`][37200]
3081 Compile-time Optimizations
3082 --------------------------
3084 * [Improve macro expansion performance][37569]
3085 * [Shrink `Expr_::ExprInlineAsm`][37445]
3086 * [Replace all uses of SHA-256 with BLAKE2b][37439]
3087 * [Reduce the number of bytes hashed by `IchHasher`][37427]
3088 * [Avoid more allocations when compiling html5ever][37373]
3089 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
3090 * [Avoid some allocations in the macro parser][37318]
3091 * [Use a faster deflate setting][37298]
3092 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
3093 during interning of slices][37270]
3094 * [Optimize `write_metadata`][37267]
3095 * [Don't process obligation forest cycles when stalled][37231]
3096 * [Avoid many `CrateConfig` clones][37161]
3097 * [Optimize `Substs::super_fold_with`][37108]
3098 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
3099 * [Speed up `plug_leaks`][36917]
3104 * [`println!()`, with no arguments, prints newline][36825].
3105 Previously, an empty string was required to achieve the same.
3106 * [`Wrapping` impls standard binary and unary operators, as well as
3107 the `Sum` and `Product` iterators][37356]
3108 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
3110 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
3111 `VecDeque` iterators][37315]
3112 * [Improve `SipHasher` performance on small values][37312]
3113 * [Add Iterator trait TrustedLen to enable better FromIterator /
3115 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
3116 * [`ReadDir` implements `Debug`][37221]
3117 * [Implement `RefUnwindSafe` for atomic types][37178]
3118 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
3119 * [Avoid allocations in `Decoder::read_str`][37064]
3120 * [`io::Error` implements `From<io::ErrorKind>`][37037]
3121 * [Impl `Debug` for raw pointers to unsized data][36880]
3122 * [Don't reuse `HashMap` random seeds][37470]
3123 * [The internal memory layout of `HashMap` is more cache-friendly, for
3124 significant improvements in some operations][36692]
3125 * [`HashMap` uses less memory on 32-bit architectures][36595]
3126 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3131 * [Expose rustc cfg values to build scripts][cargo/3243]
3132 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3133 * [Fix passing --features when testing multiple packages][cargo/3280]
3134 * [Use a single profile set per workspace][cargo/3249]
3135 * [Load `replace` sections from lock files][cargo/3220]
3136 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3141 * [rustup is the recommended Rust installation method][1.14rustup]
3142 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3143 S390x. These are [tier 2] platforms and may have major defects. Follow the
3144 instructions on the website to install, or add the targets to an existing
3145 installation with `rustup target add`. The new target triples are:
3146 - `mips-unknown-linux-gnu`
3147 - `mipsel-unknown-linux-gnu`
3148 - `mips64-unknown-linux-gnuabi64`
3149 - `mips64el-unknown-linux-gnuabi64 `
3150 - `powerpc-unknown-linux-gnu`
3151 - `powerpc64-unknown-linux-gnu`
3152 - `powerpc64le-unknown-linux-gnu`
3153 - `s390x-unknown-linux-gnu `
3154 * This release includes target (std) builds for ARM Linux running MUSL
3155 libc. These are [tier 2] platforms and may have major defects. Add the
3156 following triples to an existing rustup installation with `rustup target add`:
3157 - `arm-unknown-linux-musleabi`
3158 - `arm-unknown-linux-musleabihf`
3159 - `armv7-unknown-linux-musleabihf`
3160 * This release includes [experimental support for WebAssembly][1.14wasm], via
3161 the `wasm32-unknown-emscripten` target. This target is known to have major
3162 defects. Please test, report, and fix.
3163 * rustup no longer installs documentation by default. Run `rustup
3164 component add rust-docs` to install.
3165 * [Fix line stepping in debugger][37310]
3166 * [Enable line number debuginfo in releases][37280]
3171 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3172 * [Add support for Fuchsia OS][37313]
3173 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3178 * [A number of forward-compatibility lints used by the compiler
3179 to gradually introduce language changes have been converted
3180 to deny by default][36894]:
3181 - ["use of inaccessible extern crate erroneously allowed"][36886]
3182 - ["type parameter default erroneously allowed in invalid location"][36887]
3183 - ["detects super or self keywords at the beginning of global path"][36888]
3184 - ["two overlapping inherent impls define an item with the same name
3185 were erroneously allowed"][36889]
3186 - ["floating-point constants cannot be used in patterns"][36890]
3187 - ["constants of struct or enum type can only be used in a pattern if
3188 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3189 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3190 * [Prohibit patterns in trait methods without bodies][37378]
3191 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3192 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3193 * [The `$crate` macro variable is accepted in fewer locations][37213]
3194 * [Impls specifying extra region requirements beyond the trait
3195 they implement are rejected][37167]
3196 * [Enums may not be unsized][37111]. Unsized enums are intended to
3197 work but never have. For now they are forbidden.
3198 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3200 [tier 2]: https://forge.rust-lang.org/platform-support.html
3201 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3202 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3203 [36430]: https://github.com/rust-lang/rust/pull/36430
3204 [36595]: https://github.com/rust-lang/rust/pull/36595
3205 [36595]: https://github.com/rust-lang/rust/pull/36595
3206 [36692]: https://github.com/rust-lang/rust/pull/36692
3207 [36767]: https://github.com/rust-lang/rust/pull/36767
3208 [36794]: https://github.com/rust-lang/rust/pull/36794
3209 [36798]: https://github.com/rust-lang/rust/pull/36798
3210 [36819]: https://github.com/rust-lang/rust/pull/36819
3211 [36822]: https://github.com/rust-lang/rust/pull/36822
3212 [36825]: https://github.com/rust-lang/rust/pull/36825
3213 [36843]: https://github.com/rust-lang/rust/pull/36843
3214 [36880]: https://github.com/rust-lang/rust/pull/36880
3215 [36886]: https://github.com/rust-lang/rust/issues/36886
3216 [36887]: https://github.com/rust-lang/rust/issues/36887
3217 [36888]: https://github.com/rust-lang/rust/issues/36888
3218 [36889]: https://github.com/rust-lang/rust/issues/36889
3219 [36890]: https://github.com/rust-lang/rust/issues/36890
3220 [36891]: https://github.com/rust-lang/rust/issues/36891
3221 [36892]: https://github.com/rust-lang/rust/issues/36892
3222 [36894]: https://github.com/rust-lang/rust/pull/36894
3223 [36917]: https://github.com/rust-lang/rust/pull/36917
3224 [36993]: https://github.com/rust-lang/rust/pull/36993
3225 [37037]: https://github.com/rust-lang/rust/pull/37037
3226 [37064]: https://github.com/rust-lang/rust/pull/37064
3227 [37094]: https://github.com/rust-lang/rust/pull/37094
3228 [37108]: https://github.com/rust-lang/rust/pull/37108
3229 [37111]: https://github.com/rust-lang/rust/pull/37111
3230 [37161]: https://github.com/rust-lang/rust/pull/37161
3231 [37162]: https://github.com/rust-lang/rust/pull/37162
3232 [37167]: https://github.com/rust-lang/rust/pull/37167
3233 [37178]: https://github.com/rust-lang/rust/pull/37178
3234 [37200]: https://github.com/rust-lang/rust/pull/37200
3235 [37213]: https://github.com/rust-lang/rust/pull/37213
3236 [37221]: https://github.com/rust-lang/rust/pull/37221
3237 [37224]: https://github.com/rust-lang/rust/pull/37224
3238 [37230]: https://github.com/rust-lang/rust/pull/37230
3239 [37231]: https://github.com/rust-lang/rust/pull/37231
3240 [37247]: https://github.com/rust-lang/rust/pull/37247
3241 [37267]: https://github.com/rust-lang/rust/pull/37267
3242 [37270]: https://github.com/rust-lang/rust/pull/37270
3243 [37273]: https://github.com/rust-lang/rust/pull/37273
3244 [37280]: https://github.com/rust-lang/rust/pull/37280
3245 [37298]: https://github.com/rust-lang/rust/pull/37298
3246 [37306]: https://github.com/rust-lang/rust/pull/37306
3247 [37310]: https://github.com/rust-lang/rust/pull/37310
3248 [37312]: https://github.com/rust-lang/rust/pull/37312
3249 [37313]: https://github.com/rust-lang/rust/pull/37313
3250 [37315]: https://github.com/rust-lang/rust/pull/37315
3251 [37318]: https://github.com/rust-lang/rust/pull/37318
3252 [37322]: https://github.com/rust-lang/rust/pull/37322
3253 [37326]: https://github.com/rust-lang/rust/pull/37326
3254 [37351]: https://github.com/rust-lang/rust/pull/37351
3255 [37356]: https://github.com/rust-lang/rust/pull/37356
3256 [37367]: https://github.com/rust-lang/rust/pull/37367
3257 [37373]: https://github.com/rust-lang/rust/pull/37373
3258 [37378]: https://github.com/rust-lang/rust/pull/37378
3259 [37389]: https://github.com/rust-lang/rust/pull/37389
3260 [37392]: https://github.com/rust-lang/rust/pull/37392
3261 [37427]: https://github.com/rust-lang/rust/pull/37427
3262 [37439]: https://github.com/rust-lang/rust/pull/37439
3263 [37445]: https://github.com/rust-lang/rust/pull/37445
3264 [37470]: https://github.com/rust-lang/rust/pull/37470
3265 [37569]: https://github.com/rust-lang/rust/pull/37569
3266 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3267 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3268 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3269 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3270 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3271 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3272 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3275 Version 1.13.0 (2016-11-10)
3276 ===========================
3281 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3282 errors, like the `try!` macro, described in [RFC 0243].
3283 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3284 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3285 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3286 * [Fix lifetime rules for 'if' conditions][36029]
3287 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3292 * [Add the `-C link-arg` argument][36574]
3293 * [Remove the old AST-based backend from rustc_trans][35764]
3294 * [Don't enable NEON by default on armv7 Linux][35814]
3295 * [Fix debug line number info for macro expansions][35238]
3296 * [Do not emit "class method" debuginfo for types that are not
3297 DICompositeType][36008]
3298 * [Warn about multiple conflicting #[repr] hints][34623]
3299 * [When sizing DST, don't double-count nested struct prefixes][36351]
3300 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3301 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3302 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3303 * [Expand macros without recursing to avoid stack overflows][36214]
3308 * [Replace macro backtraces with labeled local uses][35702]
3309 * [Improve error message for misplaced doc comments][33922]
3310 * [Buffer unix and lock windows to prevent message interleaving][35975]
3311 * [Update lifetime errors to specifically note temporaries][36171]
3312 * [Special case a few colors for Windows][36178]
3313 * [Suggest `use self` when such an import resolves][36289]
3314 * [Be more specific when type parameter shadows primitive type][36338]
3315 * Many minor improvements
3317 Compile-time Optimizations
3318 --------------------------
3320 * [Compute and cache HIR hashes at beginning][35854]
3321 * [Don't hash types in loan paths][36004]
3322 * [Cache projections in trans][35761]
3323 * [Optimize the parser's last token handling][36527]
3324 * [Only instantiate #[inline] functions in codegen units referencing
3325 them][36524]. This leads to big improvements in cases where crates export
3326 define many inline functions without using them directly.
3327 * [Lazily allocate TypedArena's first chunk][36592]
3328 * [Don't allocate during default HashSet creation][36734]
3335 * [`overflowing_abs`]
3336 * [`RefCell::try_borrow`]
3337 * [`RefCell::try_borrow_mut`]
3342 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3343 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3345 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3346 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3347 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3348 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3349 * [Use arc4rand on FreeBSD][35884]
3350 * [memrchr: Correct aligned offset computation][35969]
3351 * [Improve Demangling of Rust Symbols][36059]
3352 * [Use monotonic time in condition variables][35048]
3353 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3354 * [Implement conversion traits for `char`][35755]
3355 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3356 * [Zero first byte of CString on drop][36264]
3357 * [Inherit overflow checks for sum and product][36372]
3358 * [Add missing Eq implementations][36423]
3359 * [Implement `Debug` for `DirEntry`][36631]
3360 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3362 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3363 * [Implement more traits for `std::io::ErrorKind`][35911]
3364 * [Optimize BinaryHeap bounds checking][36072]
3365 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3366 `extend_with_element`][36355]
3367 * [Fix overflow checking in unsigned pow()][34942]
3372 * This release includes security fixes to both curl and OpenSSL.
3373 * [Fix transitive doctests when panic=abort][cargo/3021]
3374 * [Add --all-features flag to cargo][cargo/3038]
3375 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3376 * [Don't parse the home directory more than once][cargo/3078]
3377 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3378 * [Update OpenSSL to 1.0.2j][cargo/3121]
3379 * [Add license and license_file to cargo metadata output][cargo/3110]
3380 * [Make crates-io registry URL optional in config; ignore all changes to
3381 source.crates-io][cargo/3089]
3382 * [Don't download dependencies from other platforms][cargo/3123]
3383 * [Build transitive dev-dependencies when needed][cargo/3125]
3384 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3385 * [Avoid updating registry when adding existing deps][cargo/3144]
3386 * [Warn about path overrides that won't work][cargo/3136]
3387 * [Use workspaces during `cargo install`][cargo/3146]
3388 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3389 * [Add --message-format flag][cargo/3000]
3390 * [Pass target environment for rustdoc][cargo/3205]
3391 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3392 * [Update curl and curl-sys][cargo/3241]
3393 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3398 * [rustdoc: Add the `--sysroot` argument][36586]
3399 * [rustdoc: Fix a couple of issues with the search results][35655]
3400 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3401 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3402 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3407 * [Remove unmaintained style guide][35124]
3408 * [Add s390x support][36369]
3409 * [Initial work at Haiku OS support][36727]
3410 * [Add mips-uclibc targets][35734]
3411 * [Crate-ify compiler-rt into compiler-builtins][35021]
3412 * [Add rustc version info (git hash + date) to dist tarball][36213]
3413 * Many documentation improvements
3418 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3419 * [Deny (by default) transmuting from fn item types to pointer-sized
3420 types][34923]. Continuing the long transition to zero-sized fn items,
3422 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3424 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3425 * [Fix lifetime rules for 'if' conditions][36029].
3426 * [Inherit overflow checks for sum and product][36372].
3427 * [Forbid user-defined macros named "macro_rules"][36730].
3429 [33922]: https://github.com/rust-lang/rust/pull/33922
3430 [34623]: https://github.com/rust-lang/rust/pull/34623
3431 [34923]: https://github.com/rust-lang/rust/pull/34923
3432 [34942]: https://github.com/rust-lang/rust/pull/34942
3433 [34982]: https://github.com/rust-lang/rust/pull/34982
3434 [35021]: https://github.com/rust-lang/rust/pull/35021
3435 [35048]: https://github.com/rust-lang/rust/pull/35048
3436 [35074]: https://github.com/rust-lang/rust/pull/35074
3437 [35124]: https://github.com/rust-lang/rust/pull/35124
3438 [35234]: https://github.com/rust-lang/rust/pull/35234
3439 [35238]: https://github.com/rust-lang/rust/pull/35238
3440 [35354]: https://github.com/rust-lang/rust/pull/35354
3441 [35559]: https://github.com/rust-lang/rust/pull/35559
3442 [35585]: https://github.com/rust-lang/rust/pull/35585
3443 [35627]: https://github.com/rust-lang/rust/pull/35627
3444 [35655]: https://github.com/rust-lang/rust/pull/35655
3445 [35702]: https://github.com/rust-lang/rust/pull/35702
3446 [35707]: https://github.com/rust-lang/rust/pull/35707
3447 [35728]: https://github.com/rust-lang/rust/pull/35728
3448 [35734]: https://github.com/rust-lang/rust/pull/35734
3449 [35755]: https://github.com/rust-lang/rust/pull/35755
3450 [35761]: https://github.com/rust-lang/rust/pull/35761
3451 [35764]: https://github.com/rust-lang/rust/pull/35764
3452 [35814]: https://github.com/rust-lang/rust/pull/35814
3453 [35854]: https://github.com/rust-lang/rust/pull/35854
3454 [35871]: https://github.com/rust-lang/rust/pull/35871
3455 [35884]: https://github.com/rust-lang/rust/pull/35884
3456 [35911]: https://github.com/rust-lang/rust/pull/35911
3457 [35969]: https://github.com/rust-lang/rust/pull/35969
3458 [35975]: https://github.com/rust-lang/rust/pull/35975
3459 [36004]: https://github.com/rust-lang/rust/pull/36004
3460 [36008]: https://github.com/rust-lang/rust/pull/36008
3461 [36014]: https://github.com/rust-lang/rust/pull/36014
3462 [36029]: https://github.com/rust-lang/rust/pull/36029
3463 [36059]: https://github.com/rust-lang/rust/pull/36059
3464 [36072]: https://github.com/rust-lang/rust/pull/36072
3465 [36101]: https://github.com/rust-lang/rust/pull/36101
3466 [36104]: https://github.com/rust-lang/rust/pull/36104
3467 [36171]: https://github.com/rust-lang/rust/pull/36171
3468 [36173]: https://github.com/rust-lang/rust/pull/36173
3469 [36178]: https://github.com/rust-lang/rust/pull/36178
3470 [36213]: https://github.com/rust-lang/rust/pull/36213
3471 [36214]: https://github.com/rust-lang/rust/pull/36214
3472 [36264]: https://github.com/rust-lang/rust/pull/36264
3473 [36266]: https://github.com/rust-lang/rust/pull/36266
3474 [36289]: https://github.com/rust-lang/rust/pull/36289
3475 [36338]: https://github.com/rust-lang/rust/pull/36338
3476 [36351]: https://github.com/rust-lang/rust/pull/36351
3477 [36355]: https://github.com/rust-lang/rust/pull/36355
3478 [36369]: https://github.com/rust-lang/rust/pull/36369
3479 [36372]: https://github.com/rust-lang/rust/pull/36372
3480 [36423]: https://github.com/rust-lang/rust/pull/36423
3481 [36482]: https://github.com/rust-lang/rust/pull/36482
3482 [36505]: https://github.com/rust-lang/rust/pull/36505
3483 [36524]: https://github.com/rust-lang/rust/pull/36524
3484 [36527]: https://github.com/rust-lang/rust/pull/36527
3485 [36551]: https://github.com/rust-lang/rust/pull/36551
3486 [36574]: https://github.com/rust-lang/rust/pull/36574
3487 [36586]: https://github.com/rust-lang/rust/pull/36586
3488 [36592]: https://github.com/rust-lang/rust/pull/36592
3489 [36631]: https://github.com/rust-lang/rust/pull/36631
3490 [36639]: https://github.com/rust-lang/rust/pull/36639
3491 [36721]: https://github.com/rust-lang/rust/pull/36721
3492 [36727]: https://github.com/rust-lang/rust/pull/36727
3493 [36730]: https://github.com/rust-lang/rust/pull/36730
3494 [36734]: https://github.com/rust-lang/rust/pull/36734
3495 [36754]: https://github.com/rust-lang/rust/pull/36754
3496 [36995]: https://github.com/rust-lang/rust/pull/36995
3497 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3498 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3499 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3500 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3501 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3502 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3503 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3504 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3505 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3506 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3507 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3508 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3509 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3510 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3511 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3512 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3513 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3514 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3515 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3516 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3517 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3518 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3519 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3520 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3521 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3522 [rustup]: https://www.rustup.rs
3523 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3524 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3525 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3526 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3527 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3528 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3529 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3532 Version 1.12.1 (2016-10-20)
3533 ===========================
3538 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3539 * [Confusion with double negation and booleans][36856]
3540 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3541 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3542 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3543 * [Corrupted memory after updated to 1.12][36936]
3544 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3545 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3546 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3548 [36381]: https://github.com/rust-lang/rust/issues/36381
3549 [36856]: https://github.com/rust-lang/rust/issues/36856
3550 [36875]: https://github.com/rust-lang/rust/issues/36875
3551 [36924]: https://github.com/rust-lang/rust/issues/36924
3552 [36926]: https://github.com/rust-lang/rust/issues/36926
3553 [36936]: https://github.com/rust-lang/rust/issues/36936
3554 [37026]: https://github.com/rust-lang/rust/issues/37026
3555 [37112]: https://github.com/rust-lang/rust/issues/37112
3556 [37153]: https://github.com/rust-lang/rust/issues/37153
3559 Version 1.12.0 (2016-09-29)
3560 ===========================
3565 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3566 This translation pass is far simpler than the previous AST->LLVM pass, and
3567 creates opportunities to perform new optimizations directly on the MIR. It
3568 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3569 * [`rustc` presents a new, more readable error format, along with
3570 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3571 Most common editors supporting Rust have been updated to work with it. It was
3572 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3577 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3578 This translation pass is far simpler than the previous AST->LLVM pass, and
3579 creates opportunities to perform new optimizations directly on the MIR. It
3580 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3581 * [Print the Rust target name, not the LLVM target name, with
3582 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3583 * [The computation of `TypeId` is correct in some cases where it was previously
3584 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3585 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3586 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3587 `--print relocation-models`, and `--print code-models` print the available
3588 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3589 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3590 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3591 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3592 These targets produce statically-linked binaries. There are no binary release
3598 * [`rustc` presents a new, more readable error format, along with
3599 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3600 Most common editors supporting Rust have been updated to work with it. It was
3601 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3602 * [In error descriptions, references are now described in plain English,
3603 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3604 * [In error type descriptions, unknown numeric types are named `{integer}` or
3605 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3606 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3611 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3612 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3613 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3614 useful](https://github.com/rust-lang/rust/pull/34908)
3615 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3616 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3617 * [Semicolons are properly required as statement delimiters inside
3618 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3619 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3624 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3625 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3626 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3627 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3628 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3629 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3630 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3631 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3632 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3633 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3634 Both on Unix and Windows.
3635 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3636 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3637 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3638 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3639 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3640 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3641 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3642 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3647 * [The `format!` macro and friends now allow a single argument to be formatted
3648 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3649 * [The lifetime bounds on `[T]::binary_search_by` and
3650 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3651 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3652 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3653 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3654 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3655 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3656 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3657 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3658 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3659 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3660 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3661 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3662 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3663 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3664 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3665 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3666 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3667 * [`mpsc::sync_channel` `Receiver`s return any available message before
3668 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3669 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3670 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3675 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3676 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3677 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3678 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3679 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3680 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3681 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3682 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3683 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3684 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3685 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3686 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3687 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3688 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3689 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3690 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3695 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3696 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3701 * [Test binaries now support a `--test-threads` argument to specify the number
3702 of threads used to run tests, and which acts the same as the
3703 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3704 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3705 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3706 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3707 * [Rust releases now come with source packages that can be installed by rustup
3708 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3709 The resulting source code can be used by tools and IDES, located in the
3710 sysroot under `lib/rustlib/src`.
3715 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3716 * Many minor improvements to the documentation.
3717 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3722 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3723 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3724 * [When formatting strings, if "precision" is specified, the "fill",
3725 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3726 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3729 Version 1.11.0 (2016-08-18)
3730 ===========================
3735 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3736 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3737 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3738 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3739 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3744 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3745 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3746 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3747 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3748 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3749 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3750 (in libcore - previously stabilized in libstd)
3751 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3752 (in libcore - previously stabilized in libstd)
3753 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3754 (in libcore - previously stabilized in libstd)
3755 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3756 (in libcore - previously stabilized in libstd)
3757 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3758 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3759 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3760 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3765 * [The `thread_local!` macro supports multiple definitions in a single
3766 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3767 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3768 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3769 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3770 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3771 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3772 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3773 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3778 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3779 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3780 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3781 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3782 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3783 and `-vv` prints warnings for all crates.
3784 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3785 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3786 This provides room for expansion by arbitrary tools.
3787 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3788 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3789 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3790 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3791 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3792 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3793 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3798 * [Caching projections speeds up type check dramatically for some
3799 workloads](https://github.com/rust-lang/rust/pull/33816)
3800 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3801 This hasher is faster, but is believed to provide sufficient
3802 protection from collision attacks.
3803 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3808 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3809 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3810 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3811 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3812 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3817 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3818 * [When emitting debug info, rustc emits frame pointers for closures,
3819 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3820 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3821 * Many more errors have been given error codes and extended
3823 * API documentation continues to be improved, with many new examples
3828 * [rustc no longer hangs when dependencies recursively re-export
3829 submodules](https://github.com/rust-lang/rust/pull/34542)
3830 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3831 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3832 rewritten](https://github.com/rust-lang/rust/pull/33895)
3833 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3834 No targets use this yet, but it works toward AVR support.
3839 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3840 * [The new follow-set rules that place restrictions on `macro_rules!`
3841 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3842 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3843 and has been a warning since 1.10.
3844 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3845 This causes breakage in some corner cases.
3848 Version 1.10.0 (2016-07-07)
3849 ===========================
3854 * [Allow `concat_idents!` in type positions as well as in expression
3855 positions](https://github.com/rust-lang/rust/pull/33735).
3856 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3857 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3858 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3859 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3860 * [`panic!` can be converted to a runtime abort with the
3861 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3862 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3863 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3864 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3865 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3866 Note that Cargo does not yet directly support cdylibs.
3871 * `os::windows::fs::OpenOptionsExt::access_mode`
3872 * `os::windows::fs::OpenOptionsExt::share_mode`
3873 * `os::windows::fs::OpenOptionsExt::custom_flags`
3874 * `os::windows::fs::OpenOptionsExt::attributes`
3875 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3876 * `os::unix::fs::OpenOptionsExt::custom_flags`
3877 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3878 * `Default for sync::Weak`
3879 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3880 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3881 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3882 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3883 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3884 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3885 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3886 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3887 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3888 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3889 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3890 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3891 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3892 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3893 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3894 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3895 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3896 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3897 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3898 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3899 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3900 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3901 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3902 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3903 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3904 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3905 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3906 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3907 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3908 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3909 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3910 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3911 * Read/Write/RawFd impls for `UnixStream`
3912 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3913 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3914 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3915 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3916 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3917 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3918 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3919 * RawFd impls for `UnixListener`
3920 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3921 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3922 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3923 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3924 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3925 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3926 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3927 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3928 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3929 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3930 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3931 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3932 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3933 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3934 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3935 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3936 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3937 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3938 * RawFd impls for `UnixDatagram`
3939 * `{BTree,Hash}Map::values_mut`
3940 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3945 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3946 The semantics of this minor method are subtle and probably not what
3948 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3949 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3950 will fall back to `/dev/urandom` temporarily to avoid blocking
3951 during early boot](https://github.com/rust-lang/rust/pull/33086).
3952 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3953 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3954 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3955 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3956 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3957 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3958 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3962 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3963 This controls the runtime behavior of the `panic!` macro
3964 and can be either "unwind" (the default), or "abort".
3965 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3966 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3967 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3968 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3969 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3970 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3971 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3972 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3973 By default they are retried twice, which can be customized with the
3974 `net.retry` value in `.cargo/config`.
3975 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3976 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3977 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3978 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3979 Makes it possible to install multiple crates in parallel.
3980 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3981 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3982 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3983 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3984 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3985 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3990 * [rustc memory usage was reduced by refactoring the context used for
3991 type checking](https://github.com/rust-lang/rust/pull/33425).
3992 * [Speed up creation of `HashMap`s by caching the random keys used
3993 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3994 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3995 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3996 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3997 10x faster than the previous lookup tables.
3998 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
4003 * Many incremental improvements to documentation and rustdoc.
4004 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
4005 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
4006 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
4007 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
4008 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
4009 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
4010 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
4015 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
4016 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
4017 * [`std` no longer prints backtraces on platforms where the running
4018 module must be loaded with `env::current_exe`, which can't be relied
4019 on](https://github.com/rust-lang/rust/pull/33554).
4020 * This release includes std binaries for the i586-unknown-linux-gnu,
4021 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
4022 i586 target is for old x86 hardware without SSE2, and the armv7
4023 target is for Android running on modern ARM architectures.
4024 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
4025 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
4026 * [On Unix the runtime aborts by calling `libc::abort` instead of
4027 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
4028 * [Rust is now bootstrapped from the previous release of Rust,
4029 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
4034 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
4035 * [`target_env` for Linux ARM targets is just `gnu`, not
4036 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
4037 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
4038 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
4039 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
4040 Affects how macros are parsed.
4041 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
4042 * [Feature-gated attributes on macro-generated macro invocations are
4043 now rejected](https://github.com/rust-lang/rust/pull/32791).
4044 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
4045 This caused some minor changes to type inference.
4048 Version 1.9.0 (2016-05-26)
4049 ==========================
4054 * The `#[deprecated]` attribute when applied to an API will generate
4055 warnings when used. The warnings may be suppressed with
4056 `#[allow(deprecated)]`. [RFC 1270].
4057 * [`fn` item types are zero sized, and each `fn` names a unique
4058 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4059 `transmute` on a `fn` type will generate a warning for a few cycles,
4060 then will be converted to an error.
4061 * [Field and method resolution understand visibility, so private
4062 fields and methods cannot prevent the proper use of public fields
4063 and methods][1.9fv].
4064 * [The parser considers unicode codepoints in the
4065 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
4071 * [`std::panic::catch_unwind`][] (renamed from `recover`)
4072 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
4073 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
4074 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
4075 * [`str::is_char_boundary`]
4076 * [`<*const T>::as_ref`]
4077 * [`<*mut T>::as_ref`]
4078 * [`<*mut T>::as_mut`]
4079 * [`AsciiExt::make_ascii_uppercase`]
4080 * [`AsciiExt::make_ascii_lowercase`]
4081 * [`char::decode_utf16`]
4082 * [`char::DecodeUtf16`]
4083 * [`char::DecodeUtf16Error`]
4084 * [`char::DecodeUtf16Error::unpaired_surrogate`]
4085 * [`BTreeSet::take`]
4086 * [`BTreeSet::replace`]
4089 * [`HashSet::replace`]
4091 * [`OsString::with_capacity`]
4092 * [`OsString::clear`]
4093 * [`OsString::capacity`]
4094 * [`OsString::reserve`]
4095 * [`OsString::reserve_exact`]
4096 * [`OsStr::is_empty`]
4098 * [`std::os::unix::thread`]
4101 * [`JoinHandleExt::as_pthread_t`]
4102 * [`JoinHandleExt::into_pthread_t`]
4103 * [`HashSet::hasher`]
4104 * [`HashMap::hasher`]
4105 * [`CommandExt::exec`]
4106 * [`File::try_clone`]
4107 * [`SocketAddr::set_ip`]
4108 * [`SocketAddr::set_port`]
4109 * [`SocketAddrV4::set_ip`]
4110 * [`SocketAddrV4::set_port`]
4111 * [`SocketAddrV6::set_ip`]
4112 * [`SocketAddrV6::set_port`]
4113 * [`SocketAddrV6::set_flowinfo`]
4114 * [`SocketAddrV6::set_scope_id`]
4115 * [`slice::copy_from_slice`]
4116 * [`ptr::read_volatile`]
4117 * [`ptr::write_volatile`]
4118 * [`OpenOptions::create_new`]
4119 * [`TcpStream::set_nodelay`]
4120 * [`TcpStream::nodelay`]
4121 * [`TcpStream::set_ttl`]
4122 * [`TcpStream::ttl`]
4123 * [`TcpStream::set_only_v6`]
4124 * [`TcpStream::only_v6`]
4125 * [`TcpStream::take_error`]
4126 * [`TcpStream::set_nonblocking`]
4127 * [`TcpListener::set_ttl`]
4128 * [`TcpListener::ttl`]
4129 * [`TcpListener::set_only_v6`]
4130 * [`TcpListener::only_v6`]
4131 * [`TcpListener::take_error`]
4132 * [`TcpListener::set_nonblocking`]
4133 * [`UdpSocket::set_broadcast`]
4134 * [`UdpSocket::broadcast`]
4135 * [`UdpSocket::set_multicast_loop_v4`]
4136 * [`UdpSocket::multicast_loop_v4`]
4137 * [`UdpSocket::set_multicast_ttl_v4`]
4138 * [`UdpSocket::multicast_ttl_v4`]
4139 * [`UdpSocket::set_multicast_loop_v6`]
4140 * [`UdpSocket::multicast_loop_v6`]
4141 * [`UdpSocket::set_multicast_ttl_v6`]
4142 * [`UdpSocket::multicast_ttl_v6`]
4143 * [`UdpSocket::set_ttl`]
4144 * [`UdpSocket::ttl`]
4145 * [`UdpSocket::set_only_v6`]
4146 * [`UdpSocket::only_v6`]
4147 * [`UdpSocket::join_multicast_v4`]
4148 * [`UdpSocket::join_multicast_v6`]
4149 * [`UdpSocket::leave_multicast_v4`]
4150 * [`UdpSocket::leave_multicast_v6`]
4151 * [`UdpSocket::take_error`]
4152 * [`UdpSocket::connect`]
4153 * [`UdpSocket::send`]
4154 * [`UdpSocket::recv`]
4155 * [`UdpSocket::set_nonblocking`]
4160 * [`std::sync::Once` is poisoned if its initialization function
4162 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4163 * [Most types implement `fmt::Debug`][1.9db].
4164 * [The default buffer size used by `BufReader` and `BufWriter` was
4165 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4166 used by other languages.
4167 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4168 `Duration` additionally implements `*=` and `/=`][1.9ta].
4169 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4170 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4171 * [`Chain` implements `BufRead`][1.9ch].
4172 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4177 * [Cargo can now run concurrently][1.9cc].
4178 * [Top-level overrides allow specific revisions of crates to be
4179 overridden through the entire crate graph][1.9ct]. This is intended
4180 to make upgrades easier for large projects, by allowing crates to be
4181 forked temporarily until they've been upgraded and republished.
4182 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4183 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4184 on the commandline][1.9cf]. `rustc` arguments can also be specified
4185 in the `build.rustflags` configuration key.
4190 * [The time complexity of comparing variables for equivalence during type
4191 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4192 to major compilation time improvement in some scenarios.
4193 * [`ToString` is specialized for `str`, giving it the same performance
4194 as `to_owned`][1.9ts].
4195 * [Spawning processes with `Command::output` no longer creates extra
4197 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4198 for C-like enums][1.9cl].
4203 * [Passing the `--quiet` flag to a test runner will produce
4204 much-abbreviated output][1.9q].
4205 * The Rust Project now publishes std binaries for the
4206 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4207 `i586-pc-windows-msvc` targets.
4212 * [`std::sync::Once` is poisoned if its initialization function
4214 * [It is illegal to define methods with the same name in overlapping
4215 inherent `impl` blocks][1.9sn].
4216 * [`fn` item types are zero sized, and each `fn` names a unique
4217 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4218 `transmute` on a `fn` type will generate a warning for a few cycles,
4219 then will be converted to an error.
4220 * [Improvements to const evaluation may trigger new errors when integer
4221 literals are out of range][1.9ce].
4224 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4225 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4226 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4227 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4228 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4229 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4230 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4231 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4232 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4233 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4234 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4235 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4236 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4237 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4238 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4239 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4240 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4241 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4242 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4243 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4244 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4245 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4246 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4247 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4248 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4249 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4250 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4251 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4252 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4253 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4254 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4255 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4256 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4257 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4258 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4259 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4260 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4261 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4262 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4263 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4264 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4265 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4266 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4267 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4268 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4269 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4270 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4271 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4272 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4273 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4274 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4275 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4276 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4277 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4278 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4279 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4280 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4281 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4282 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4283 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4284 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4285 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4286 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4287 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4288 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4289 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4290 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4291 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4292 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4293 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4294 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4295 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4296 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4297 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4298 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4299 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4300 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4301 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4302 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4303 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4304 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4305 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4306 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4307 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4308 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4309 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4310 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4311 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4312 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4313 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4314 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4315 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4316 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4317 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4318 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4319 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4320 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4321 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4322 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4323 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4324 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4325 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4326 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4327 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4328 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4329 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4330 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4331 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4332 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4333 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4336 Version 1.8.0 (2016-04-14)
4337 ==========================
4342 * Rust supports overloading of compound assignment statements like
4343 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4344 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4345 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4347 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4348 addition to the non-braced form, `struct Foo;`. [RFC 218].
4354 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4355 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4358 * [`ptr::drop_in_place`]
4360 * [`time::SystemTime`]
4362 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4363 * [`Instant::elapsed`]
4364 * [`SystemTime::now`]
4365 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4366 * [`SystemTime::elapsed`]
4367 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4368 * [`SystemTimeError`]
4369 * [`SystemTimeError::duration`]
4370 * Various impls for `SystemTimeError`
4372 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4373 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4374 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4375 * [The `write!` and `writeln!` macros correctly emit errors if any of
4376 their arguments can't be formatted][1.8w].
4377 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4378 * [The Unix-specific `raw` modules, which contain a number of
4379 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4380 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4381 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4382 across platforms was making it difficult to implement `std`
4383 correctly. Those that need these definitions should use the `libc`
4385 * The Unix-specific `MetadataExt` traits, including
4386 `os::unix::fs::MetadataExt`, which expose values such as inode
4387 numbers [no longer return platform-specific types][1.8r], but
4388 instead return widened integers. [RFC 1415].
4389 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4390 * [Atomic loads and stores are not volatile][1.8a].
4391 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4396 * [Inlining hash functions lead to a 3% compile-time improvement in
4397 some workloads][1.8h].
4398 * When using jemalloc, its symbols are [unprefixed so that it
4399 overrides the libc malloc implementation][1.8h]. This means that for
4400 rustc, LLVM is now using jemalloc, which results in a 6%
4401 compile-time improvement on a specific workload.
4402 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4407 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4408 i686-pc-windows-msvc is now considered a tier-1 platform.
4409 * [The `--print targets` flag prints a list of supported targets][1.8t].
4410 * [The `--print cfg` flag prints the `cfg`s defined for the current
4412 * [`rustc` can be built with an new Cargo-based build system, written
4413 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4414 build system. To enable it configure with `configure --rustbuild`.
4415 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4416 variants while also indicating the total number of missing variants
4417 if more than 3][1.8m].
4418 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4419 * The Rust Project now publishes binary releases of the standard
4420 library for a number of tier-2 targets:
4421 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4422 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4423 `x86_64-rumprun-netbsd`. These can be installed with
4424 tools such as [multirust][1.8mr].
4429 * [`cargo init` creates a new Cargo project in the current
4430 directory][1.8ci]. It is otherwise like `cargo new`.
4431 * [Cargo has configuration keys for `-v` and
4432 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4433 `[term]` section of `.cargo/config`.
4434 * [Configuration keys that evaluate to strings or integers can be set
4435 via environment variables][1.8ce]. For example the `build.jobs` key
4436 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4437 precedence over config files.
4438 * [Target-specific dependencies support Rust `cfg` syntax for
4439 describing targets][1.8cfg] so that dependencies for multiple
4440 targets can be specified together. [RFC 1361].
4441 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4442 `RUSTDOC` take precedence over the `build.target-dir`,
4443 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4444 * [The child process tree is killed on Windows when Cargo is
4446 * [The `build.target` configuration value sets the target platform,
4447 like `--target`][1.8ct].
4452 * [Unstable compiler flags have been further restricted][1.8u]. Since
4453 1.0 `-Z` flags have been considered unstable, and other flags that
4454 were considered unstable additionally required passing `-Z
4455 unstable-options` to access. Unlike unstable language and library
4456 features though, these options have been accessible on the stable
4457 release channel. Going forward, *new unstable flags will not be
4458 available on the stable release channel*, and old unstable flags
4459 will warn about their usage. In the future, all unstable flags will
4460 be unavailable on the stable release channel.
4461 * [It is no longer possible to `match` on empty enum variants using
4462 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4463 * The Unix-specific `MetadataExt` traits, including
4464 `os::unix::fs::MetadataExt`, which expose values such as inode
4465 numbers [no longer return platform-specific types][1.8r], but
4466 instead return widened integers. [RFC 1415].
4467 * [Modules sourced from the filesystem cannot appear within arbitrary
4468 blocks, but only within other modules][1.8mf].
4469 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4470 * On Unix, [stack overflow triggers a runtime abort instead of a
4472 * [`Command::spawn` and its equivalents return an error if any of
4473 its command-line arguments contain interior `NUL`s][1.8n].
4474 * [Tuple and unit enum variants from other crates are in the type
4476 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4477 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4478 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4479 instead of `foo.lib`.
4482 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4483 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4484 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4485 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4486 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4487 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4488 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4489 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4490 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4491 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4492 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4493 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4494 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4495 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4496 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4497 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4498 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4499 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4500 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4501 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4502 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4503 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4504 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4505 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4506 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4507 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4508 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4509 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4510 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4511 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4512 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4513 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4514 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4515 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4516 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4517 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4518 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4519 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4520 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4521 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4522 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4523 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4524 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4525 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4526 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4527 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4528 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4529 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4530 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4531 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4532 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4533 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4534 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4535 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4536 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4537 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4538 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4539 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4540 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4541 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4544 Version 1.7.0 (2016-03-03)
4545 ==========================
4552 * [`Path::strip_prefix`][] (renamed from relative_from)
4553 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4555 * [`Ipv4Addr::is_loopback`]
4556 * [`Ipv4Addr::is_private`]
4557 * [`Ipv4Addr::is_link_local`]
4558 * [`Ipv4Addr::is_multicast`]
4559 * [`Ipv4Addr::is_broadcast`]
4560 * [`Ipv4Addr::is_documentation`]
4562 * [`Ipv6Addr::is_unspecified`]
4563 * [`Ipv6Addr::is_loopback`]
4564 * [`Ipv6Addr::is_multicast`]
4567 * [`Vec::as_mut_slice`]
4569 * [`String::as_str`]
4570 * [`String::as_mut_str`]
4572 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4574 * `<[T]>::`[`sort_by_key`]
4575 * checked, saturated, and overflowing operations
4576 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4577 * [`i32::saturating_mul`]
4578 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4579 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4580 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4581 * [`u32::saturating_mul`]
4582 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4583 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4584 * and checked, saturated, and overflowing operations for other primitive types
4586 * [`ffi::IntoStringError`]
4587 * [`CString::into_string`]
4588 * [`CString::into_bytes`]
4589 * [`CString::into_bytes_with_nul`]
4590 * `From<CString> for Vec<u8>`
4592 * [`IntoStringError::into_cstring`]
4593 * [`IntoStringError::utf8_error`]
4594 * `Error for IntoStringError`
4596 * [`std::hash::BuildHasher`]
4597 * [`BuildHasher::Hasher`]
4598 * [`BuildHasher::build_hasher`]
4599 * [`std::hash::BuildHasherDefault`]
4600 * [`HashMap::with_hasher`]
4601 * [`HashMap::with_capacity_and_hasher`]
4602 * [`HashSet::with_hasher`]
4603 * [`HashSet::with_capacity_and_hasher`]
4604 * [`std::collections::hash_map::RandomState`]
4605 * [`RandomState::new`]
4606 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4607 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4608 from bytes is faster.
4609 * [The performance of `LineWriter` (and thus `io::stdout`) was
4610 improved by using `memchr` to search for newlines][1.7m].
4611 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4612 `f64` variants were stabilized previously.
4613 * [`BTreeMap` was rewritten to use less memory and improve the performance
4614 of insertion and iteration, the latter by as much as 5x][1.7bm].
4615 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4616 covariant over their contained type][1.7bt].
4617 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4618 over their contained type][1.7ll].
4619 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4621 * [`Any` is implemented for unsized types][1.7a].
4622 * [`Hash` is implemented for `Duration`][1.7h].
4627 * [When running tests with `--test`, rustdoc will pass `--cfg`
4628 arguments to the compiler][1.7dt].
4629 * [The compiler is built with RPATH information by default][1.7rpa].
4630 This means that it will be possible to run `rustc` when installed in
4631 unusual configurations without configuring the dynamic linker search
4633 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4634 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4635 over `LD_LIBRARY_PATH`.
4640 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4641 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4642 * [The `rerun-if-changed` build script directive no longer causes the
4643 build script to incorrectly run twice in certain scenarios][1.7rr].
4648 * Soundness fixes to the interactions between associated types and
4649 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4650 code that violates the new rules. This is a significant change that
4651 is known to break existing code, so it has emitted warnings for the
4652 new error cases since 1.4 to give crate authors time to adapt. The
4653 details of what is changing are subtle; read the RFC for more.
4654 * [Several bugs in the compiler's visibility calculations were
4655 fixed][1.7v]. Since this was found to break significant amounts of
4656 code, the new errors will be emitted as warnings for several release
4657 cycles, under the `private_in_public` lint.
4658 * Defaulted type parameters were accidentally accepted in positions
4659 that were not intended. In this release, [defaulted type parameters
4660 appearing outside of type definitions will generate a
4661 warning][1.7d], which will become an error in future releases.
4662 * [Parsing "." as a float results in an error instead of 0][1.7p].
4663 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4664 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4666 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4667 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4668 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4669 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4670 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4671 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4672 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4673 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4674 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4675 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4676 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4677 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4678 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4679 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4680 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4681 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4682 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4683 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4684 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4685 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4686 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4687 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4688 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4689 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4690 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4691 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4692 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4693 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4694 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4695 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4696 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4697 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4698 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4699 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4700 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4701 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4702 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4703 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4704 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4705 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4706 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4707 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4708 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4709 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4710 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4711 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4712 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4713 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4714 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4715 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4716 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4717 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4718 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4719 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4720 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4721 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4722 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4723 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4724 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4725 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4726 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4727 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4728 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4729 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4730 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4731 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4732 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4733 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4734 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4735 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4736 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4737 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4738 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4739 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4740 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4741 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4742 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4743 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4744 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4747 Version 1.6.0 (2016-01-21)
4748 ==========================
4753 * The `#![no_std]` attribute causes a crate to not be linked to the
4754 standard library, but only the [core library][1.6co], as described
4755 in [RFC 1184]. The core library defines common types and traits but
4756 has no platform dependencies whatsoever, and is the basis for Rust
4757 software in environments that cannot support a full port of the
4758 standard library, such as operating systems. Most of the core
4759 library is now stable.
4765 [`Read::read_exact`],
4766 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4767 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4768 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4769 [`os::unix::fs::DirBuilderExt`],
4770 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4771 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4772 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4773 [`collections::hash_map::Drain`],
4774 [`collections::hash_map::HashMap::drain`],
4775 [`collections::hash_set::Drain`],
4776 [`collections::hash_set::HashSet::drain`],
4777 [`collections::binary_heap::Drain`],
4778 [`collections::binary_heap::BinaryHeap::drain`],
4779 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4780 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4781 [`RwLock::into_inner`],
4782 [`Iterator::min_by_key`][] (renamed from `min_by`),
4783 [`Iterator::max_by_key`][] (renamed from `max_by`).
4784 * The [core library][1.6co] is stable, as are most of its APIs.
4785 * [The `assert_eq!` macro supports arguments that don't implement
4786 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4788 * Several timer functions that take duration in milliseconds [are
4789 deprecated in favor of those that take `Duration`][1.6ms]. These
4790 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4791 `thread::park_timeout_ms`.
4792 * The algorithm by which `Vec` reserves additional elements was
4793 [tweaked to not allocate excessive space][1.6a] while still growing
4795 * `From` conversions are [implemented from integers to floats][1.6f]
4796 in cases where the conversion is lossless. Thus they are not
4797 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4798 or `f64`. They are also not implemented for `isize` and `usize`
4799 because the implementations would be platform-specific. `From` is
4800 also implemented from `f32` to `f64`.
4801 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4802 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4803 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4804 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4806 * Sorting slices that are already sorted [is 50% faster in some
4812 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4813 * Cargo build scripts can specify their dependencies by emitting the
4814 [`rerun-if-changed`][1.6rr] key.
4815 * crates.io will reject publication of crates with dependencies that
4816 have a wildcard version constraint. Crates with wildcard
4817 dependencies were seen to cause a variety of problems, as described
4818 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4820 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4821 release folder. A variety of artifacts that Cargo failed to clean
4822 are now correctly deleted.
4827 * The `unreachable_code` lint [warns when a function call's argument
4829 * The parser indicates [failures that may be caused by
4830 confusingly-similar Unicode characters][1.6uc]
4831 * Certain macro errors [are reported at definition time][1.6m], not
4837 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4838 environment variable when locating crates. This was a pre-cargo
4839 feature for integrating with the package manager that was
4840 accidentally never removed.
4841 * [A number of bugs were fixed in the privacy checker][1.6p] that
4842 could cause previously-accepted code to break.
4843 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4844 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4845 struct pattern syntax (`Foo(..)`) can no longer be used to match
4846 unit structs. This is a warning now, but will become an error in
4847 future releases. Patterns that share the same name as a const are
4849 * A bug was fixed that causes [rustc not to apply default type
4850 parameters][1.6xc] when resolving certain method implementations of
4851 traits defined in other crates.
4853 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4854 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4855 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4856 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4857 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4858 [1.6co]: http://doc.rust-lang.org/core/index.html
4859 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4860 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4861 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4862 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4863 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4864 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4865 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4866 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4867 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4868 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4869 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4870 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4871 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4872 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4873 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4874 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4875 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4876 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4877 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4878 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4879 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4880 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4881 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4882 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4883 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4884 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4885 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4886 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4887 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4888 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4889 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4890 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4891 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4892 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4893 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4894 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4895 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4896 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4897 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4898 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4899 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4902 Version 1.5.0 (2015-12-10)
4903 ==========================
4905 * ~700 changes, numerous bugfixes
4911 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4912 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4913 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4914 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4915 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4916 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4917 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4918 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4919 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4920 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4921 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4922 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4923 [`Path::read_link`], [`Path::symlink_metadata`],
4924 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4925 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4926 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4927 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4928 [`slice::split_first_mut`], [`slice::split_first`],
4929 [`slice::split_last_mut`], [`slice::split_last`],
4930 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4931 [`str::MatchIndices`], [`str::RMatchIndices`],
4932 [`str::match_indices`], [`str::rmatch_indices`],
4933 [`str::slice_mut_unchecked`], [`string::ParseError`].
4934 * Rust applications hosted on crates.io can be installed locally to
4935 `~/.cargo/bin` with the [`cargo install`] command. Among other
4936 things this makes it easier to augment Cargo with new subcommands:
4937 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4938 invoked as `cargo foo`.
4939 * Crates with wildcard (`*`) dependencies will [emit warnings when
4940 published][1.5w]. In 1.6 it will no longer be possible to publish
4941 crates with wildcard dependencies.
4946 * The rules determining when a particular lifetime must outlive
4947 a particular value (known as '[dropck]') have been [modified
4948 to not rely on parametricity][1.5p].
4949 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4950 and `Arc`][1.5a]. Because these smart pointer types implement
4951 `Deref`, this causes breakage in cases where the interior type
4952 contains methods of the same name.
4953 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4954 that they could drop their content. Soundness fix.
4955 * All method invocations are [properly checked][1.5wf1] for
4956 [well-formedness][1.5wf2]. Soundness fix.
4957 * Traits whose supertraits contain `Self` are [not object
4958 safe][1.5o]. Soundness fix.
4959 * Target specifications support a [`no_default_libraries`][1.5nd]
4960 setting that controls whether `-nodefaultlibs` is passed to the
4961 linker, and in turn the `is_like_windows` setting no longer affects
4962 the `-nodefaultlibs` flag.
4963 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4964 * The `#[inline]` and `#[repr]` attributes [can only appear
4965 in valid locations][1.5at].
4966 * Native libraries linked from the local crate are [passed to
4967 the linker before native libraries from upstream crates][1.5nl].
4968 * Two rarely-used attributes, `#[no_debug]` and
4969 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4970 * Negation of unsigned integers, which has been a warning for
4971 several releases, [is now behind a feature gate and will
4972 generate errors][1.5nu].
4973 * The parser accidentally accepted visibility modifiers on
4974 enum variants, a bug [which has been fixed][1.5ev].
4975 * [A bug was fixed that allowed `use` statements to import unstable
4981 * When evaluating expressions at compile-time that are not
4982 compile-time constants (const-evaluating expressions in non-const
4983 contexts), incorrect code such as overlong bitshifts and arithmetic
4984 overflow will [generate a warning instead of an error][1.5ce],
4985 delaying the error until runtime. This will allow the
4986 const-evaluator to be expanded in the future backwards-compatibly.
4987 * The `improper_ctypes` lint [no longer warns about using `isize` and
4988 `usize` in FFI][1.5ict].
4993 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4995 * `Default` is [implemented for mutable slices][1.5d].
4996 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4997 * There are now `From` conversions [between floating point
4998 types][1.5f] where the conversions are lossless.
4999 * There are now `From` conversions [between integer types][1.5i] where
5000 the conversions are lossless.
5001 * [`fs::Metadata` implements `Clone`][1.5fs].
5002 * The `parse` method [accepts a leading "+" when parsing
5004 * [`AsMut` is implemented for `Vec`][1.5am].
5005 * The `clone_from` implementations for `String` and `BinaryHeap` [have
5006 been optimized][1.5cf] and no longer rely on the default impl.
5007 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
5008 `unsafe extern "C"` function types now [implement `Clone`,
5009 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
5010 `fmt::Debug` for up to 12 arguments][1.5fp].
5011 * [Dropping `Vec`s is much faster in unoptimized builds when the
5012 element types don't implement `Drop`][1.5dv].
5013 * A bug that caused in incorrect behavior when [combining `VecDeque`
5014 with zero-sized types][1.5vdz] was resolved.
5015 * [`PartialOrd` for slices is faster][1.5po].
5020 * [Crate metadata size was reduced by 20%][1.5md].
5021 * [Improvements to code generation reduced the size of libcore by 3.3
5022 MB and rustc's memory usage by 18MB][1.5m].
5023 * [Improvements to deref translation increased performance in
5024 unoptimized builds][1.5dr].
5025 * Various errors in trait resolution [are deduplicated to only be
5026 reported once][1.5te].
5027 * Rust has preliminary [support for rumprun kernels][1.5rr].
5028 * Rust has preliminary [support for NetBSD on amd64][1.5na].
5030 [1.5use]: https://github.com/rust-lang/rust/pull/28364
5031 [1.5po]: https://github.com/rust-lang/rust/pull/28436
5032 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
5033 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
5034 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
5035 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
5036 [1.5md]: https://github.com/rust-lang/rust/pull/28521
5037 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
5038 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
5039 [1.5na]: https://github.com/rust-lang/rust/pull/28543
5040 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
5041 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
5042 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
5043 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
5044 [1.5te]: https://github.com/rust-lang/rust/pull/28645
5045 [1.5at]: https://github.com/rust-lang/rust/pull/28650
5046 [1.5am]: https://github.com/rust-lang/rust/pull/28663
5047 [1.5m]: https://github.com/rust-lang/rust/pull/28778
5048 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
5049 [1.5a]: https://github.com/rust-lang/rust/pull/28811
5050 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
5051 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
5052 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
5053 [1.5i]: https://github.com/rust-lang/rust/pull/28921
5054 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
5055 [1.5f]: https://github.com/rust-lang/rust/pull/29129
5056 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
5057 [1.5s]: https://github.com/rust-lang/rust/pull/29190
5058 [1.5d]: https://github.com/rust-lang/rust/pull/29245
5059 [1.5o]: https://github.com/rust-lang/rust/pull/29259
5060 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
5061 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5062 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
5063 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
5064 [1.5c]: https://github.com/rust-lang/rust/pull/29110
5065 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5066 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
5067 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
5068 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
5069 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
5070 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
5071 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
5072 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
5073 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
5074 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
5075 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
5076 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
5077 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
5078 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
5079 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
5080 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
5081 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
5082 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
5083 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
5084 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
5085 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
5086 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
5087 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
5088 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
5089 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
5090 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
5091 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
5092 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
5093 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
5094 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
5095 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
5096 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
5097 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
5098 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
5099 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
5100 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
5101 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
5102 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
5103 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
5104 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
5105 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
5106 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
5107 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
5108 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
5109 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
5110 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
5111 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
5112 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
5113 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
5114 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
5115 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
5116 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
5117 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
5118 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
5120 Version 1.4.0 (2015-10-29)
5121 ==========================
5123 * ~1200 changes, numerous bugfixes
5128 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5129 GNU) are now supported and recommended for use.
5134 * [Several changes have been made to fix type soundness and improve
5135 the behavior of associated types][sound]. See [RFC 1214]. Although
5136 we have mostly introduced these changes as warnings this release, to
5137 become errors next release, there are still some scenarios that will
5138 see immediate breakage.
5139 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5140 line breaks in addition to `\n`][crlf].
5141 * [Loans of `'static` lifetime extend to the end of a function][stat].
5142 * [`str::parse` no longer introduces avoidable rounding error when
5143 parsing floating point numbers. Together with earlier changes to
5144 float formatting/output, "round trips" like f.to_string().parse()
5145 now preserve the value of f exactly. Additionally, leading plus
5146 signs are now accepted][fp3].
5152 * `use` statements that import multiple items [can now rename
5153 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5154 * [Binops work correctly on fat pointers][binfat].
5155 * `pub extern crate`, which does not behave as expected, [issues a
5156 warning][pec] until a better solution is found.
5161 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5162 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5163 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5164 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5165 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5166 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5167 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5168 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5169 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5170 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5171 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5172 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5173 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5174 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5175 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5176 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5177 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5178 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5180 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5181 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5182 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5183 `f64::from_str_radix`.
5184 * [Reverse-searching strings is faster with the 'two-way'
5186 * [`std::io::copy` allows `?Sized` arguments][cc].
5187 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5188 [override `count`, `nth` and `last` with an O(1)
5189 implementation][it].
5190 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5191 * [`IntoRawFd` has been added to the Unix-specific prelude,
5192 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5194 * [`Extend<String>` and `FromIterator<String` are both implemented for
5196 * [`IntoIterator` is implemented for references to `Option` and
5198 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5199 Copy`][ext] as part of [RFC 839]. This will cause type inference
5200 breakage in rare situations.
5201 * [`BinaryHeap` implements `Debug`][bh2].
5202 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5204 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5205 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5206 * [String comparison is faster][faststr].
5207 * `&mut T` where `T: std::fmt::Write` [also implements
5208 `std::fmt::Write`][mutw].
5209 * [A stable regression in `VecDeque::push_back` and other
5210 capacity-altering methods that caused panics for zero-sized types
5212 * [Function pointers implement traits for up to 12 parameters][fp2].
5217 * The compiler [no longer uses the 'morestack' feature to prevent
5218 stack overflow][mm]. Instead it uses guard pages and stack
5219 probes (though stack probes are not yet implemented on any platform
5221 * [The compiler matches traits faster when projections are involved][p].
5222 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5224 * [Cargo now displays useful information about what its doing during
5225 `cargo update`][cu].
5227 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5228 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5229 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5230 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5231 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5232 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5233 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5234 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5235 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5236 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5237 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5238 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5239 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5240 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5241 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5242 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5243 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5244 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5245 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5246 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5247 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5248 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5249 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5250 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5251 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5252 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5253 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5254 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5255 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5256 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5257 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5258 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5259 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5260 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5261 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5262 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5263 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5264 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5265 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5266 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5267 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5268 [bh2]: https://github.com/rust-lang/rust/pull/28156
5269 [binfat]: https://github.com/rust-lang/rust/pull/28270
5270 [bm]: https://github.com/rust-lang/rust/pull/28197
5271 [cc]: https://github.com/rust-lang/rust/pull/27531
5272 [crlf]: https://github.com/rust-lang/rust/pull/28034
5273 [cu]: https://github.com/rust-lang/cargo/pull/1931
5274 [d]: https://github.com/rust-lang/rust/pull/27825
5275 [dep]: https://github.com/rust-lang/rust/pull/28339
5276 [es]: https://github.com/rust-lang/rust/pull/27956
5277 [ext]: https://github.com/rust-lang/rust/pull/28094
5278 [faststr]: https://github.com/rust-lang/rust/pull/28338
5279 [ffi]: https://github.com/rust-lang/rust/pull/28779
5280 [fp]: https://github.com/rust-lang/rust/pull/28268
5281 [fp2]: https://github.com/rust-lang/rust/pull/28560
5282 [fp3]: https://github.com/rust-lang/rust/pull/27307
5283 [i]: https://github.com/rust-lang/rust/pull/27451
5284 [into2]: https://github.com/rust-lang/rust/pull/28039
5285 [it]: https://github.com/rust-lang/rust/pull/27652
5286 [mm]: https://github.com/rust-lang/rust/pull/27338
5287 [mutw]: https://github.com/rust-lang/rust/pull/28368
5288 [sound]: https://github.com/rust-lang/rust/pull/27641
5289 [p]: https://github.com/rust-lang/rust/pull/27866
5290 [pec]: https://github.com/rust-lang/rust/pull/28486
5291 [pr]: https://github.com/rust-lang/rust/pull/27896
5292 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5293 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5294 [s]: https://github.com/rust-lang/rust/pull/27474
5295 [stab]: https://github.com/rust-lang/rust/pull/28339
5296 [stat]: https://github.com/rust-lang/rust/pull/28321
5297 [vd]: https://github.com/rust-lang/rust/pull/28494
5299 Version 1.3.0 (2015-09-17)
5300 ==============================
5302 * ~900 changes, numerous bugfixes
5307 * The [new object lifetime defaults][nold] have been [turned
5308 on][nold2] after a cycle of warnings about the change. Now types
5309 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5310 being interpreted as `&'a Box<Trait+'a>` to `&'a
5311 Box<Trait+'static>`.
5312 * [The Rustonomicon][nom] is a new book in the official documentation
5313 that dives into writing unsafe Rust.
5314 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5315 timekeeping is employed by other std APIs, as well as out-of-tree
5321 * The [new object lifetime defaults][nold] have been [turned
5322 on][nold2] after a cycle of warnings about the change.
5323 * There is a known [regression][lr] in how object lifetime elision is
5324 interpreted, the proper solution for which is undetermined.
5325 * The `#[prelude_import]` attribute, an internal implementation
5326 detail, was accidentally stabilized previously. [It has been put
5327 behind the `prelude_import` feature gate][pi]. This change is
5328 believed to break no existing code.
5329 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5330 [more sane for dynamically sized types][dst3]. Code that relied on
5331 the previous behavior is thought to be broken.
5332 * The `dropck` rules, which checks that destructors can't access
5333 destroyed values, [have been updated][dropck] to match the
5334 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5335 cause some previously-compiling code to no longer build.
5340 * The [new object lifetime defaults][nold] have been [turned
5341 on][nold2] after a cycle of warnings about the change.
5342 * Semicolons may [now follow types and paths in
5343 macros](https://github.com/rust-lang/rust/pull/27000).
5344 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5345 [more sane for dynamically sized types][dst3]. Code that relied on
5346 the previous behavior is not known to exist, and suspected to be
5348 * `'static` variables [may now be recursive][st].
5349 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5350 implementations correctly.
5351 * The `dropck` rules, which checks that destructors can't access
5352 destroyed values, [have been updated][dropck] to match the
5358 * The [`Duration`] API, [has been stabilized][ds], as well as the
5359 `std::time` module, which presently contains only `Duration`.
5360 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5361 * The owned C string, [`CString`], implements [`Borrow`] and the
5362 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5363 these allow C strings to be borrowed and cloned in generic code.
5364 * [`CStr`] implements [`Debug`].
5365 * [`AtomicPtr`] implements [`Debug`].
5366 * [`Error`] trait objects [can be downcast to their concrete types][e]
5367 in many common configurations, using the [`is`], [`downcast`],
5368 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5370 * Searching for substrings now [employs the two-way algorithm][search]
5371 instead of doing a naive search. This gives major speedups to a
5372 number of methods, including [`contains`][sc], [`find`][sf],
5373 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5374 [`ends_with`][sew] are also faster.
5375 * The performance of `PartialEq` for slices is [much faster][ps].
5376 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5377 is overridden and optimized by the implementations for scalars.
5378 * The [`Hasher`] trait now has a number of specialized `write_*`
5379 methods for primitive types, for efficiency.
5380 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5381 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5382 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5383 of [`std::error::Error::cause`][iec] also delegates to the inner
5385 * [`process::Child`][pc] gained the [`id`] method, which returns a
5386 `u32` representing the platform-specific process identifier.
5387 * The [`connect`] method on slices is deprecated, replaced by the new
5388 [`join`] method (note that both of these are on the *unstable*
5389 [`SliceConcatExt`] trait, but through the magic of the prelude are
5390 available to stable code anyway).
5391 * The [`Div`] operator is implemented for [`Wrapping`] types.
5392 * [`DerefMut` is implemented for `String`][dms].
5393 * Performance of SipHash (the default hasher for `HashMap`) is
5394 [better for long data][sh].
5395 * [`AtomicPtr`] implements [`Send`].
5396 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5397 are now [specialized to use uninitialized buffers for increased
5399 * Lifetime parameters of foreign functions [are now resolved
5405 * Rust can now, with some coercion, [produce programs that run on
5406 Windows XP][xp], though XP is not considered a supported platform.
5407 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5408 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5409 recommended for use in 1.3, though should be fully-functional
5410 in the [64-bit 1.4 beta][b14].
5411 * On Fedora-based systems installation will [properly configure the
5412 dynamic linker][fl].
5413 * The compiler gained many new extended error descriptions, which can
5414 be accessed with the `--explain` flag.
5415 * The `dropck` pass, which checks that destructors can't access
5416 destroyed values, [has been rewritten][dropck]. This fixes some
5417 soundness holes, and as such will cause some previously-compiling
5418 code to no longer build.
5419 * `rustc` now uses [LLVM to write archive files where possible][ar].
5420 Eventually this will eliminate the compiler's dependency on the ar
5422 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5423 supported FreeBSD on x86_64).
5424 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5425 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5427 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5428 will kill the process instead of leaking][nlp].
5430 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5431 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5432 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5433 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5434 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5435 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5436 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5437 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5438 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5439 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5440 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5441 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5442 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5443 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5444 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5445 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5446 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5447 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5448 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5449 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5450 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5451 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5452 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5453 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5454 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5455 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5456 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5457 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5458 [ar]: https://github.com/rust-lang/rust/pull/26926
5459 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5460 [dms]: https://github.com/rust-lang/rust/pull/26241
5461 [dropck]: https://github.com/rust-lang/rust/pull/27261
5462 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5463 [ds]: https://github.com/rust-lang/rust/pull/26818
5464 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5465 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5466 [dst3]: https://github.com/rust-lang/rust/pull/27351
5467 [e]: https://github.com/rust-lang/rust/pull/24793
5468 [f]: https://github.com/rust-lang/rust/pull/26588
5469 [fb]: https://github.com/rust-lang/rust/pull/26959
5470 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5471 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5472 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5473 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5474 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5475 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5476 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5477 [lic]: https://github.com/rust-lang/rust/pull/26583
5478 [lnu]: https://github.com/rust-lang/rust/pull/27026
5479 [lr]: https://github.com/rust-lang/rust/issues/27248
5480 [lum]: https://github.com/rust-lang/rust/pull/26378
5481 [lur]: https://github.com/rust-lang/rust/pull/26783
5482 [nlp]: https://github.com/rust-lang/rust/pull/27176
5483 [nold2]: https://github.com/rust-lang/rust/pull/27045
5484 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5485 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5486 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5487 [pi]: https://github.com/rust-lang/rust/pull/26699
5488 [ps]: https://github.com/rust-lang/rust/pull/26884
5489 [rte]: https://github.com/rust-lang/rust/pull/26950
5490 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5491 [search]: https://github.com/rust-lang/rust/pull/26327
5492 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5493 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5494 [sh]: https://github.com/rust-lang/rust/pull/27280
5495 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5496 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5497 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5498 [st]: https://github.com/rust-lang/rust/pull/26630
5499 [win1]: https://github.com/rust-lang/rust/pull/26569
5500 [win2]: https://github.com/rust-lang/rust/pull/26741
5501 [win3]: https://github.com/rust-lang/rust/pull/26741
5502 [win4]: https://github.com/rust-lang/rust/pull/27210
5503 [xp]: https://github.com/rust-lang/rust/pull/26569
5505 Version 1.2.0 (2015-08-07)
5506 ==========================
5508 * ~1200 changes, numerous bugfixes
5513 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5514 like `Rc` to contain types without a fixed size, arrays and trait
5515 objects, finally enabling use of `Rc<[T]>` and completing the
5516 implementation of DST.
5517 * [Parallel codegen][parcodegen] is now working again, which can
5518 substantially speed up large builds in debug mode; It also gets
5519 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5520 jobs). It's not enabled by default, but will be "in the near
5521 future". It can be activated with the `-C codegen-units=N` flag to
5523 * This is the first release with [experimental support for linking
5524 with the MSVC linker and lib C on Windows (instead of using the GNU
5525 variants via MinGW)][win]. It is yet recommended only for the most
5526 intrepid Rustaceans.
5527 * Benchmark compilations are showing a 30% improvement in
5528 bootstrapping over 1.1.
5533 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5534 unicode case mapping, which is a previously-planned change in
5535 behavior and considered a bugfix.
5536 * [`mem::align_of`] now specifies [the *minimum alignment* for
5537 T][align], which is usually the alignment programs are interested
5538 in, and the same value reported by clang's
5539 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5541 * [The `#[packed]` attribute is no longer silently accepted by the
5542 compiler][packed]. This attribute did nothing and code that
5543 mentioned it likely did not work as intended.
5544 * Associated type defaults are [now behind the
5545 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5546 defaults *did not work*, but could be mentioned syntactically. As
5547 such this breakage has minimal impact.
5552 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5553 matching against dereferenceable values.
5558 * The [`Extend`] trait, which grows a collection from an iterator, is
5559 implemented over iterators of references, for `String`, `Vec`,
5560 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5561 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5562 * The [`iter::once`] function returns an iterator that yields a single
5563 element, and [`iter::empty`] returns an iterator that yields no
5565 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5566 over substring matches.
5567 * [`Cell`] and [`RefCell`] both implement `Eq`.
5568 * A number of methods for wrapping arithmetic are added to the
5569 integral types, [`wrapping_div`], [`wrapping_rem`],
5570 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5571 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5572 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5573 type.. It is illegal for the default arithmetic operations in Rust
5574 to overflow; the desire to wrap must be explicit.
5575 * The `{:#?}` formatting specifier [displays the alternate,
5576 pretty-printed][debugfmt] form of the `Debug` formatter. This
5577 feature was actually introduced prior to 1.0 with little
5579 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5580 for writing data to formatted strings, similar to [`io::Write`].
5581 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5582 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5583 are used by code generators to emit implementations of [`Debug`].
5584 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5585 methods that convert case, following Unicode case mapping.
5586 * It is now easier to handle poisoned locks. The [`PoisonError`]
5587 type, returned by failing lock operations, exposes `into_inner`,
5588 `get_ref`, and `get_mut`, which all give access to the inner lock
5589 guard, and allow the poisoned lock to continue to operate. The
5590 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5591 poisoned lock without attempting to take the lock.
5592 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5593 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5594 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5595 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5597 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5603 * `rustc` employs smarter heuristics for guessing at [typos].
5604 * `rustc` emits more efficient code for [no-op conversions between
5605 unsafe pointers][nop].
5606 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5607 resulting in faster compile times and smaller code.
5609 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5610 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5611 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5612 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5613 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5614 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5615 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5616 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5617 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5618 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5619 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5620 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5621 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5622 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5623 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5624 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5625 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5626 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5627 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5628 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5629 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5630 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5631 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5632 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5633 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5634 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5635 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5636 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5637 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5638 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5639 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5640 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5641 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5642 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5643 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5644 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5645 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5646 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5647 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5648 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5649 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5650 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5651 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5652 [align]: https://github.com/rust-lang/rust/pull/25646
5653 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5654 [typos]: https://github.com/rust-lang/rust/pull/26087
5655 [nop]: https://github.com/rust-lang/rust/pull/26336
5656 [fat]: https://github.com/rust-lang/rust/pull/26411
5657 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5658 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5659 [packed]: https://github.com/rust-lang/rust/pull/25541
5660 [ad]: https://github.com/rust-lang/rust/pull/27382
5661 [win]: https://github.com/rust-lang/rust/pull/25350
5663 Version 1.1.0 (2015-06-25)
5664 =========================
5666 * ~850 changes, numerous bugfixes
5671 * The [`std::fs` module has been expanded][fs] to expand the set of
5672 functionality exposed:
5673 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5674 don't incur a syscall on some platforms.
5675 * A `symlink_metadata` function has been added.
5676 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5677 access to all underlying information.
5678 * The compiler now contains extended explanations of many errors. When an error
5679 with an explanation occurs the compiler suggests using the `--explain` flag
5680 to read the explanation. Error explanations are also [available online][err-index].
5681 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5682 well as other work, the time to bootstrap the compiler decreased by
5688 * The [`str::split_whitespace`] method splits a string on unicode
5689 whitespace boundaries.
5690 * On both Windows and Unix, new extension traits provide conversion of
5691 I/O types to and from the underlying system handles. On Unix, these
5692 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5693 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5694 `TcpListener`, and `UpdSocket`. Further implementations for
5695 `std::process` will be stabilized later.
5696 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5697 Windows, symlinks can be created with
5698 `std::os::windows::symlink_dir` and
5699 `std::os::windows::symlink_file`.
5700 * The `mpsc::Receiver` type can now be converted into an iterator with
5701 `into_iter` on the [`IntoIterator`] trait.
5702 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5703 implementation of the [`From`] trait.
5704 * The `Debug` implementation for `RangeFull` [creates output that is
5705 more consistent with other implementations][rf].
5706 * [`Debug` is implemented for `File`][file].
5707 * The `Default` implementation for `Arc` [no longer requires `Sync +
5709 * [The `Iterator` methods `count`, `nth`, and `last` have been
5710 overridden for slices to have O(1) performance instead of O(n)][si].
5711 * Incorrect handling of paths on Windows has been improved in both the
5712 compiler and the standard library.
5713 * [`AtomicPtr` gained a `Default` implementation][ap].
5714 * In accordance with Rust's policy on arithmetic overflow `abs` now
5715 [panics on overflow when debug assertions are enabled][abs].
5716 * The [`Cloned`] iterator, which was accidentally left unstable for
5717 1.0 [has been stabilized][c].
5718 * The [`Incoming`] iterator, which iterates over incoming TCP
5719 connections, and which was accidentally unnamable in 1.0, [is now
5720 properly exported][inc].
5721 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5722 `sift_up` or `sift_down` panic][bh].
5723 * The [`split_off`] method of `LinkedList` [no longer corrupts
5724 the list in certain scenarios][ll].
5729 * Type checking performance [has improved notably][sk] with
5730 [multiple improvements][pre].
5731 * The compiler [suggests code changes][ch] for more errors.
5732 * rustc and it's build system have experimental support for [building
5733 toolchains against MUSL][m] instead of glibc on Linux.
5734 * The compiler defines the `target_env` cfg value, which is used for
5735 distinguishing toolchains that are otherwise for the same
5736 platform. Presently this is set to `gnu` for common GNU Linux
5737 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5738 * The [`cargo rustc`][crc] command invokes a build with custom flags
5740 * [Android executables are always position independent][pie].
5741 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5744 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5745 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5746 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5747 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5748 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5749 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5750 [rf]: https://github.com/rust-lang/rust/pull/24491
5751 [err-index]: https://doc.rust-lang.org/error-index.html
5752 [sk]: https://github.com/rust-lang/rust/pull/24615
5753 [pre]: https://github.com/rust-lang/rust/pull/25323
5754 [file]: https://github.com/rust-lang/rust/pull/24598
5755 [ch]: https://github.com/rust-lang/rust/pull/24683
5756 [arc]: https://github.com/rust-lang/rust/pull/24695
5757 [si]: https://github.com/rust-lang/rust/pull/24701
5758 [ap]: https://github.com/rust-lang/rust/pull/24834
5759 [m]: https://github.com/rust-lang/rust/pull/24777
5760 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5761 [crc]: https://github.com/rust-lang/cargo/pull/1568
5762 [pie]: https://github.com/rust-lang/rust/pull/24953
5763 [abs]: https://github.com/rust-lang/rust/pull/25441
5764 [c]: https://github.com/rust-lang/rust/pull/25496
5765 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5766 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5767 [inc]: https://github.com/rust-lang/rust/pull/25522
5768 [bh]: https://github.com/rust-lang/rust/pull/25856
5769 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5770 [ll]: https://github.com/rust-lang/rust/pull/26022
5771 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5772 [drop]: https://github.com/rust-lang/rust/pull/24935
5774 Version 1.0.0 (2015-05-15)
5775 ========================
5777 * ~1500 changes, numerous bugfixes
5782 * The vast majority of the standard library is now `#[stable]`. It is
5783 no longer possible to use unstable features with a stable build of
5785 * Many popular crates on [crates.io] now work on the stable release
5787 * Arithmetic on basic integer types now [checks for overflow in debug
5793 * Several [restrictions have been added to trait coherence][coh] in
5794 order to make it easier for upstream authors to change traits
5795 without breaking downstream code.
5796 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5797 improve error messages and macro behavior. For example, `0b1234` is
5798 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5799 * Trait bounds [are always invariant][inv], eliminating the need for
5800 the `PhantomFn` and `MarkerTrait` lang items, which have been
5802 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5803 "foo" as bar` syntax has been replaced with `extern crate foo as
5804 bar`, and Cargo now automatically translates "-" in *package* names
5805 to underscore for the crate name.
5806 * [Lifetime shadowing is an error][lt].
5807 * [`Send` no longer implies `'static`][send-rfc].
5808 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5809 `MyType::default()`.
5810 * Primitive types [now have inherent methods][prim-inherent],
5811 obviating the need for extension traits like `SliceExt`.
5812 * Methods with `Self: Sized` in their `where` clause are [considered
5813 object-safe][self-sized], allowing many extension traits like
5814 `IteratorExt` to be merged into the traits they extended.
5815 * You can now [refer to associated types][assoc-where] whose
5816 corresponding trait bounds appear only in a `where` clause.
5817 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5818 like `Send` and `Sync` are now library-defined.
5819 * A [Reflect trait][reflect] was introduced, which means that
5820 downcasting via the `Any` trait is effectively limited to concrete
5821 types. This helps retain the potentially-important "parametricity"
5822 property: generic code cannot behave differently for different type
5823 arguments except in minor ways.
5824 * The `unsafe_destructor` feature is now deprecated in favor of the
5825 [new `dropck`][dropck]. This change is a major reduction in unsafe
5831 * The `thread_local` module [has been renamed to `std::thread`][th].
5832 * The methods of `IteratorExt` [have been moved to the `Iterator`
5834 * Several traits that implement Rust's conventions for type
5835 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5836 [centralized in the `std::convert` module][con].
5837 * The `FromError` trait [was removed in favor of `From`][fe].
5838 * The basic sleep function [has moved to
5839 `std::thread::sleep_ms`][slp].
5840 * The `splitn` function now takes an `n` parameter that represents the
5841 number of items yielded by the returned iterator [instead of the
5842 number of 'splits'][spl].
5843 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5844 * [Derived implementations of `PartialOrd` now order enums according
5845 to their explicitly-assigned discriminants][po].
5846 * [Methods for searching strings are generic over `Pattern`s][pat],
5847 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5849 * [In method resolution, object methods are resolved before inherent
5851 * [`String::from_str` has been deprecated in favor of the `From` impl,
5852 `String::from`][sf].
5853 * [`io::Error` implements `Sync`][ios].
5854 * [The `words` method on `&str` has been replaced with
5855 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5857 * The new path and IO modules are complete and `#[stable]`. This
5858 was the major library focus for this cycle.
5859 * The path API was [revised][path-normalize] to normalize `.`,
5860 adjusting the tradeoffs in favor of the most common usage.
5861 * A large number of remaining APIs in `std` were also stabilized
5862 during this cycle; about 75% of the non-deprecated API surface
5864 * The new [string pattern API][string-pattern] landed, which makes
5865 the string slice API much more internally consistent and flexible.
5866 * A new set of [generic conversion traits][conversion] replaced
5867 many existing ad hoc traits.
5868 * Generic numeric traits were [completely removed][num-traits]. This
5869 was made possible thanks to inherent methods for primitive types,
5870 and the removal gives maximal flexibility for designing a numeric
5871 hierarchy in the future.
5872 * The `Fn` traits are now related via [inheritance][fn-inherit]
5873 and provide ergonomic [blanket implementations][fn-blanket].
5874 * The `Index` and `IndexMut` traits were changed to
5875 [take the index by value][index-value], enabling code like
5876 `hash_map["string"]` to work.
5877 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5878 `Copy` data is known to be `Clone` as well.
5883 * Many errors now have extended explanations that can be accessed with
5884 the `--explain` flag to `rustc`.
5885 * Many new examples have been added to the standard library
5887 * rustdoc has received a number of improvements focused on completion
5889 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5890 * Much headway was made on ecosystem-wide CI, making it possible
5891 to [compare builds for breakage][ci-compare].
5894 [crates.io]: http://crates.io
5895 [clo]: https://github.com/rust-lang/rust/pull/24034
5896 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5897 [con]: https://github.com/rust-lang/rust/pull/23875
5898 [cr]: https://github.com/rust-lang/rust/pull/23419
5899 [fe]: https://github.com/rust-lang/rust/pull/23879
5900 [ie]: https://github.com/rust-lang/rust/pull/23300
5901 [inv]: https://github.com/rust-lang/rust/pull/23938
5902 [ios]: https://github.com/rust-lang/rust/pull/24133
5903 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5904 [lt]: https://github.com/rust-lang/rust/pull/24057
5905 [meth]: https://github.com/rust-lang/rust/pull/24056
5906 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5907 [po]: https://github.com/rust-lang/rust/pull/24270
5908 [sf]: https://github.com/rust-lang/rust/pull/24517
5909 [slp]: https://github.com/rust-lang/rust/pull/23949
5910 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5911 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5912 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5913 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5914 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5915 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5916 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5917 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5918 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5919 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5920 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5921 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5922 [reflect]: https://github.com/rust-lang/rust/pull/23712
5923 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5924 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5925 [index-value]: https://github.com/rust-lang/rust/pull/23601
5926 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5927 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5928 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5929 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5930 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5931 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5934 Version 1.0.0-alpha.2 (2015-02-20)
5935 =====================================
5937 * ~1300 changes, numerous bugfixes
5941 * The various I/O modules were [overhauled][io-rfc] to reduce
5942 unnecessary abstractions and provide better interoperation with
5943 the underlying platform. The old `io` module remains temporarily
5945 * The standard library now [participates in feature gating][feat],
5946 so use of unstable libraries now requires a `#![feature(...)]`
5947 attribute. The impact of this change is [described on the
5948 forum][feat-forum]. [RFC][feat-rfc].
5952 * `for` loops [now operate on the `IntoIterator` trait][into],
5953 which eliminates the need to call `.iter()`, etc. to iterate
5954 over collections. There are some new subtleties to remember
5955 though regarding what sort of iterators various types yield, in
5956 particular that `for foo in bar { }` yields values from a move
5957 iterator, destroying the original collection. [RFC][into-rfc].
5958 * Objects now have [default lifetime bounds][obj], so you don't
5959 have to write `Box<Trait+'static>` when you don't care about
5960 storing references. [RFC][obj-rfc].
5961 * In types that implement `Drop`, [lifetimes must outlive the
5962 value][drop]. This will soon make it possible to safely
5963 implement `Drop` for types where `#[unsafe_destructor]` is now
5964 required. Read the [gorgeous RFC][drop-rfc] for details.
5965 * The fully qualified <T as Trait>::X syntax lets you set the Self
5966 type for a trait method or associated type. [RFC][ufcs-rfc].
5967 * References to types that implement `Deref<U>` now [automatically
5968 coerce to references][deref] to the dereferenced type `U`,
5969 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5970 should eliminate many unsightly uses of `&*`, as when converting
5971 from references to vectors into references to
5972 slices. [RFC][deref-rfc].
5973 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5974 `|:|`) is obsolete and closure kind is inferred from context.
5975 * [`Self` is a keyword][Self].
5979 * The `Show` and `String` formatting traits [have been
5980 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5981 their related purposes. Automatically getting a string
5982 conversion to use with `format!("{:?}", something_to_debug)` is
5983 now written `#[derive(Debug)]`.
5984 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5985 OsStr}`, provide strings in platform-specific encodings for easier
5986 interop with system APIs. [RFC][osstr-rfc].
5987 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5988 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5989 creating raw pointers.
5993 * Certain long error messages of the form 'expected foo found bar'
5994 are now [split neatly across multiple
5995 lines][multiline]. Examples in the PR.
5996 * On Unix Rust can be [uninstalled][un] by running
5997 `/usr/local/lib/rustlib/uninstall.sh`.
5998 * The `#[rustc_on_unimplemented]` attribute, requiring the
5999 'on_unimplemented' feature, lets rustc [display custom error
6000 messages when a trait is expected to be implemented for a type
6005 * Rust is tested against a [LALR grammar][lalr], which parses
6006 almost all the Rust files that rustc does.
6008 [boxraw]: https://github.com/rust-lang/rust/pull/21318
6009 [close]: https://github.com/rust-lang/rust/pull/21843
6010 [deref]: https://github.com/rust-lang/rust/pull/21351
6011 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
6012 [drop]: https://github.com/rust-lang/rust/pull/21972
6013 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6014 [feat]: https://github.com/rust-lang/rust/pull/21248
6015 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
6016 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
6017 [fmt]: https://github.com/rust-lang/rust/pull/21457
6018 [into]: https://github.com/rust-lang/rust/pull/20790
6019 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
6020 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6021 [lalr]: https://github.com/rust-lang/rust/pull/21452
6022 [multiline]: https://github.com/rust-lang/rust/pull/19870
6023 [obj]: https://github.com/rust-lang/rust/pull/22230
6024 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
6025 [onun]: https://github.com/rust-lang/rust/pull/20889
6026 [osstr]: https://github.com/rust-lang/rust/pull/21488
6027 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6028 [Self]: https://github.com/rust-lang/rust/pull/22158
6029 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
6030 [un]: https://github.com/rust-lang/rust/pull/22256
6033 Version 1.0.0-alpha (2015-01-09)
6034 ==================================
6036 * ~2400 changes, numerous bugfixes
6040 * The language itself is considered feature complete for 1.0,
6041 though there will be many usability improvements and bugfixes
6042 before the final release.
6043 * Nearly 50% of the public API surface of the standard library has
6044 been declared 'stable'. Those interfaces are unlikely to change
6046 * The long-running debate over integer types has been
6047 [settled][ints]: Rust will ship with types named `isize` and
6048 `usize`, rather than `int` and `uint`, for pointer-sized
6049 integers. Guidelines will be rolled out during the alpha cycle.
6050 * Most crates that are not `std` have been moved out of the Rust
6051 distribution into the Cargo ecosystem so they can evolve
6052 separately and don't need to be stabilized as quickly, including
6053 'time', 'getopts', 'num', 'regex', and 'term'.
6054 * Documentation continues to be expanded with more API coverage, more
6055 examples, and more in-depth explanations. The guides have been
6056 consolidated into [The Rust Programming Language][trpl].
6057 * "[Rust By Example][rbe]" is now maintained by the Rust team.
6058 * All official Rust binary installers now come with [Cargo], the
6059 Rust package manager.
6063 * Closures have been [completely redesigned][unboxed] to be
6064 implemented in terms of traits, can now be used as generic type
6065 bounds and thus monomorphized and inlined, or via an opaque
6066 pointer (boxed) as in the old system. The new system is often
6067 referred to as 'unboxed' closures.
6068 * Traits now support [associated types][assoc], allowing families
6069 of related types to be defined together and used generically in
6071 * Enum variants are [namespaced by their type names][enum].
6072 * [`where` clauses][where] provide a more versatile and attractive
6073 syntax for specifying generic bounds, though the previous syntax
6075 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
6077 * Rust [no longer has a runtime][rt] of any description, and only
6078 supports OS threads, not green threads.
6079 * At long last, Rust has been overhauled for 'dynamically-sized
6080 types' ([DST]), which integrates 'fat pointers' (object types,
6081 arrays, and `str`) more deeply into the type system, making it
6083 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
6084 `..j` that produce range types and which, when combined with the
6085 `Index` operator and multidispatch, leads to a convenient slice
6087 * The new range syntax revealed an ambiguity in the fixed-length
6088 array syntax, so now fixed length arrays [are written `[T;
6090 * The `Copy` trait is no longer implemented automatically. Unsafe
6091 pointers no longer implement `Sync` and `Send` so types
6092 containing them don't automatically either. `Sync` and `Send`
6093 are now 'unsafe traits' so one can "forcibly" implement them via
6094 `unsafe impl` if a type confirms to the requirements for them
6095 even though the internals do not (e.g. structs containing unsafe
6096 pointers like `Arc`). These changes are intended to prevent some
6097 footguns and are collectively known as [opt-in built-in
6098 traits][oibit] (though `Sync` and `Send` will soon become pure
6099 library types unknown to the compiler).
6100 * Operator traits now take their operands [by value][ops], and
6101 comparison traits can use multidispatch to compare one type
6102 against multiple other types, allowing e.g. `String` to be
6103 compared with `&str`.
6104 * `if let` and `while let` are no longer feature-gated.
6105 * Rust has adopted a more [uniform syntax for escaping unicode
6106 characters][unicode].
6107 * `macro_rules!` [has been declared stable][mac]. Though it is a
6108 flawed system it is sufficiently popular that it must be usable
6109 for 1.0. Effort has gone into [future-proofing][mac-future] it
6110 in ways that will allow other macro systems to be developed in
6111 parallel, and won't otherwise impact the evolution of the
6113 * The prelude has been [pared back significantly][prelude] such
6114 that it is the minimum necessary to support the most pervasive
6115 code patterns, and through [generalized where clauses][where]
6116 many of the prelude extension traits have been consolidated.
6117 * Rust's rudimentary reflection [has been removed][refl], as it
6118 incurred too much code generation for little benefit.
6119 * [Struct variants][structvars] are no longer feature-gated.
6120 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
6121 known as 'higher-ranked trait bounds', this crucially allows
6122 unboxed closures to work.
6123 * Macros invocations surrounded by parens or square brackets and
6124 not terminated by a semicolon are [parsed as
6125 expressions][macros], which makes expressions like `vec![1i32,
6126 2, 3].len()` work as expected.
6127 * Trait objects now implement their traits automatically, and
6128 traits that can be coerced to objects now must be [object
6130 * Automatically deriving traits is now done with `#[derive(...)]`
6131 not `#[deriving(...)]` for [consistency with other naming
6132 conventions][derive].
6133 * Importing the containing module or enum at the same time as
6134 items or variants they contain is [now done with `self` instead
6135 of `mod`][self], as in use `foo::{self, bar}`
6136 * Glob imports are no longer feature-gated.
6137 * The `box` operator and `box` patterns have been feature-gated
6138 pending a redesign. For now unique boxes should be allocated
6139 like other containers, with `Box::new`.
6143 * A [series][coll1] of [efforts][coll2] to establish
6144 [conventions][coll3] for collections types has resulted in API
6145 improvements throughout the standard library.
6146 * New [APIs for error handling][err] provide ergonomic interop
6147 between error types, and [new conventions][err-conv] describe
6148 more clearly the recommended error handling strategies in Rust.
6149 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6150 it is easier to discuss failure in the context of error handling
6151 without making clarifications as to whether you are referring to
6152 the 'fail' macro or failure more generally.
6153 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6154 syscall when available.
6155 * The 'serialize' crate has been renamed 'rustc-serialize' and
6156 moved out of the distribution to Cargo. Although it is widely
6157 used now, it is expected to be superseded in the near future.
6158 * The `Show` formatter, typically implemented with
6159 `#[derive(Show)]` is [now requested with the `{:?}`
6160 specifier][show] and is intended for use by all types, for uses
6161 such as `println!` debugging. The new `String` formatter must be
6162 implemented by hand, uses the `{}` specifier, and is intended
6163 for full-fidelity conversions of things that can logically be
6164 represented as strings.
6168 * [Flexible target specification][flex] allows rustc's code
6169 generation to be configured to support otherwise-unsupported
6171 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6172 respective debuggers with Rust-appropriate pretty-printing.
6173 * The Windows installation of Rust is distributed with the
6174 MinGW components currently required to link binaries on that
6179 * Nullable enum optimizations have been extended to more types so
6180 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6181 space than the inner types themselves.
6182 * Work has begun on supporting AArch64.
6184 [Cargo]: https://crates.io
6185 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6186 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6187 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6188 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6189 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6190 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6191 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6192 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6193 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6194 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6195 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6196 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6197 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6198 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6199 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6200 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6201 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6202 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6203 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6204 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6205 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6206 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6207 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6208 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6209 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6210 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6211 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6212 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6213 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6214 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6215 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6216 [trpl]: https://doc.rust-lang.org/book/index.html
6217 [rbe]: http://rustbyexample.com/
6220 Version 0.12.0 (2014-10-09)
6221 =============================
6223 * ~1900 changes, numerous bugfixes
6227 * The introductory documentation (now called The Rust Guide) has
6228 been completely rewritten, as have a number of supplementary
6230 * Rust's package manager, Cargo, continues to improve and is
6231 sometimes considered to be quite awesome.
6232 * Many API's in `std` have been reviewed and updated for
6233 consistency with the in-development Rust coding
6234 guidelines. The standard library documentation tracks
6235 stabilization progress.
6236 * Minor libraries have been moved out-of-tree to the rust-lang org
6237 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6238 be installed with Cargo.
6239 * Lifetime elision allows lifetime annotations to be left off of
6240 function declarations in many common scenarios.
6241 * Rust now works on 64-bit Windows.
6244 * Indexing can be overloaded with the `Index` and `IndexMut`
6246 * The `if let` construct takes a branch only if the `let` pattern
6247 matches, currently behind the 'if_let' feature gate.
6248 * 'where clauses', a more flexible syntax for specifying trait
6249 bounds that is more aesthetic, have been added for traits and
6250 free functions. Where clauses will in the future make it
6251 possible to constrain associated types, which would be
6252 impossible with the existing syntax.
6253 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6254 the 'slicing_syntax' feature gate, and can be overloaded with
6255 the `Slice` or `SliceMut` traits.
6256 * The syntax for matching of sub-slices has been changed to use a
6257 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6258 consistency with other uses of `..` and to future-proof
6259 potential additional uses of the syntax.
6260 * The syntax for matching inclusive ranges in patterns has changed
6261 from `0..3` to `0...4` to be consistent with the exclusive range
6263 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6264 c]`) has been put behind the 'advanced_slice_patterns' feature
6265 gate and may be removed in the future.
6266 * Components of tuples and tuple structs can be extracted using
6267 the `value.0` syntax, currently behind the `tuple_indexing`
6269 * The `#[crate_id]` attribute is no longer supported; versioning
6270 is handled by the package manager.
6271 * Renaming crate imports are now written `extern crate foo as bar`
6272 instead of `extern crate bar = foo`.
6273 * Renaming use statements are now written `use foo as bar` instead
6275 * `let` and `match` bindings and argument names in macros are now
6277 * The new, more efficient, closure types ('unboxed closures') have
6278 been added under a feature gate, 'unboxed_closures'. These will
6279 soon replace the existing closure types, once higher-ranked
6280 trait lifetimes are added to the language.
6281 * `move` has been added as a keyword, for indicating closures
6282 that capture by value.
6283 * Mutation and assignment is no longer allowed in pattern guards.
6284 * Generic structs and enums can now have trait bounds.
6285 * The `Share` trait is now called `Sync` to free up the term
6286 'shared' to refer to 'shared reference' (the default reference
6288 * Dynamically-sized types have been mostly implemented,
6289 unifying the behavior of fat-pointer types with the rest of the
6291 * As part of dynamically-sized types, the `Sized` trait has been
6292 introduced, which qualifying types implement by default, and
6293 which type parameters expect by default. To specify that a type
6294 parameter does not need to be sized, write `<Sized? T>`. Most
6295 types are `Sized`, notable exceptions being unsized arrays
6296 (`[T]`) and trait types.
6297 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6298 * Lifetime bounds can now be applied to type parameters and object
6300 * The old, reference counted GC type, `Gc<T>` which was once
6301 denoted by the `@` sigil, has finally been removed. GC will be
6302 revisited in the future.
6305 * Library documentation has been improved for a number of modules.
6306 * Bit-vectors, collections::bitv has been modernized.
6307 * The url crate is deprecated in favor of
6308 http://github.com/servo/rust-url, which can be installed with
6310 * Most I/O stream types can be cloned and subsequently closed from
6312 * A `std::time::Duration` type has been added for use in I/O
6313 methods that rely on timers, as well as in the 'time' crate's
6314 `Timespec` arithmetic.
6315 * The runtime I/O abstraction layer that enabled the green thread
6316 scheduler to do non-thread-blocking I/O has been removed, along
6317 with the libuv-based implementation employed by the green thread
6318 scheduler. This will greatly simplify the future I/O work.
6319 * `collections::btree` has been rewritten to have a more
6320 idiomatic and efficient design.
6323 * rustdoc output now indicates the stability levels of API's.
6324 * The `--crate-name` flag can specify the name of the crate
6325 being compiled, like `#[crate_name]`.
6326 * The `-C metadata` specifies additional metadata to hash into
6327 symbol names, and `-C extra-filename` specifies additional
6328 information to put into the output filename, for use by the
6329 package manager for versioning.
6330 * debug info generation has continued to improve and should be
6331 more reliable under both gdb and lldb.
6332 * rustc has experimental support for compiling in parallel
6333 using the `-C codegen-units` flag.
6334 * rustc no longer encodes rpath information into binaries by
6338 * Stack usage has been optimized with LLVM lifetime annotations.
6339 * Official Rust binaries on Linux are more compatible with older
6340 kernels and distributions, built on CentOS 5.10.
6343 Version 0.11.0 (2014-07-02)
6344 ==========================
6346 * ~1700 changes, numerous bugfixes
6349 * ~[T] has been removed from the language. This type is superseded by
6351 * ~str has been removed from the language. This type is superseded by
6353 * ~T has been removed from the language. This type is superseded by the
6355 * @T has been removed from the language. This type is superseded by the
6356 standard library's std::gc::Gc<T> type.
6357 * Struct fields are now all private by default.
6358 * Vector indices and shift amounts are both required to be a `uint`
6359 instead of any integral type.
6360 * Byte character, byte string, and raw byte string literals are now all
6361 supported by prefixing the normal literal with a `b`.
6362 * Multiple ABIs are no longer allowed in an ABI string
6363 * The syntax for lifetimes on closures/procedures has been tweaked
6364 slightly: `<'a>|A, B|: 'b + K -> T`
6365 * Floating point modulus has been removed from the language; however it
6366 is still provided by a library implementation.
6367 * Private enum variants are now disallowed.
6368 * The `priv` keyword has been removed from the language.
6369 * A closure can no longer be invoked through a &-pointer.
6370 * The `use foo, bar, baz;` syntax has been removed from the language.
6371 * The transmute intrinsic no longer works on type parameters.
6372 * Statics now allow blocks/items in their definition.
6373 * Trait bounds are separated from objects with + instead of : now.
6374 * Objects can no longer be read while they are mutably borrowed.
6375 * The address of a static is now marked as insignificant unless the
6376 #[inline(never)] attribute is placed it.
6377 * The #[unsafe_destructor] attribute is now behind a feature gate.
6378 * Struct literals are no longer allowed in ambiguous positions such as
6379 if, while, match, and for..in.
6380 * Declaration of lang items and intrinsics are now feature-gated by
6382 * Integral literals no longer default to `int`, and floating point
6383 literals no longer default to `f64`. Literals must be suffixed with an
6384 appropriate type if inference cannot determine the type of the
6386 * The Box<T> type is no longer implicitly borrowed to &mut T.
6387 * Procedures are now required to not capture borrowed references.
6390 * The standard library is now a "facade" over a number of underlying
6391 libraries. This means that development on the standard library should
6392 be speedier due to smaller crates, as well as a clearer line between
6394 * A new library, libcore, lives under the standard library's facade
6395 which is Rust's "0-assumption" library, suitable for embedded and
6396 kernel development for example.
6397 * A regex crate has been added to the standard distribution. This crate
6398 includes statically compiled regular expressions.
6399 * The unwrap/unwrap_err methods on Result require a Show bound for
6400 better error messages.
6401 * The return types of the std::comm primitives have been centralized
6402 around the Result type.
6403 * A number of I/O primitives have gained the ability to time out their
6405 * A number of I/O primitives have gained the ability to close their
6406 reading/writing halves to cancel pending operations.
6407 * Reverse iterator methods have been removed in favor of `rev()` on
6408 their forward-iteration counterparts.
6409 * A bitflags! macro has been added to enable easy interop with C and
6410 management of bit flags.
6411 * A debug_assert! macro is now provided which is disabled when
6412 `--cfg ndebug` is passed to the compiler.
6413 * A graphviz crate has been added for creating .dot files.
6414 * The std::cast module has been migrated into std::mem.
6415 * The std::local_data api has been migrated from freestanding functions
6416 to being based on methods.
6417 * The Pod trait has been renamed to Copy.
6418 * jemalloc has been added as the default allocator for types.
6419 * The API for allocating memory has been changed to use proper alignment
6420 and sized deallocation
6421 * Connecting a TcpStream or binding a TcpListener is now based on a
6422 string address and a u16 port. This allows connecting to a hostname as
6424 * The Reader trait now contains a core method, read_at_least(), which
6425 correctly handles many repeated 0-length reads.
6426 * The process-spawning API is now centered around a builder-style
6428 * The :? printing qualifier has been moved from the standard library to
6429 an external libdebug crate.
6430 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6431 have been renamed to Eq/Ord.
6432 * The select/plural methods have been removed from format!. The escapes
6433 for { and } have also changed from \{ and \} to {{ and }},
6435 * The TaskBuilder API has been re-worked to be a true builder, and
6436 extension traits for spawning native/green tasks have been added.
6439 * All breaking changes to the language or libraries now have their
6440 commit message annotated with `[breaking-change]` to allow for easy
6441 discovery of breaking changes.
6442 * The compiler will now try to suggest how to annotate lifetimes if a
6443 lifetime-related error occurs.
6444 * Debug info continues to be improved greatly with general bug fixes and
6445 better support for situations like link time optimization (LTO).
6446 * Usage of syntax extensions when cross-compiling has been fixed.
6447 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6448 -fdata-sections and --gc-sections has been enabled by default
6449 * The compiler is now stricter about where it will load module files
6450 from when a module is declared via `mod foo;`.
6451 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6452 Syntax extensions are now discovered via a "plugin registrar" type
6453 which will be extended in the future to other various plugins.
6454 * Lints have been restructured to allow for dynamically loadable lints.
6455 * A number of rustdoc improvements:
6456 * The HTML output has been visually redesigned.
6457 * Markdown is now powered by hoedown instead of sundown.
6458 * Searching heuristics have been greatly improved.
6459 * The search index has been reduced in size by a great amount.
6460 * Cross-crate documentation via `pub use` has been greatly improved.
6461 * Primitive types are now hyperlinked and documented.
6462 * Documentation has been moved from static.rust-lang.org/doc to
6464 * A new sandbox, play.rust-lang.org, is available for running and
6465 sharing rust code examples on-line.
6466 * Unused attributes are now more robustly warned about.
6467 * The dead_code lint now warns about unused struct fields.
6468 * Cross-compiling to iOS is now supported.
6469 * Cross-compiling to mipsel is now supported.
6470 * Stability attributes are now inherited by default and no longer apply
6471 to intra-crate usage, only inter-crate usage.
6472 * Error message related to non-exhaustive match expressions have been
6476 Version 0.10 (2014-04-03)
6477 =========================
6479 * ~1500 changes, numerous bugfixes
6482 * A new RFC process is now in place for modifying the language.
6483 * Patterns with `@`-pointers have been removed from the language.
6484 * Patterns with unique vectors (`~[T]`) have been removed from the
6486 * Patterns with unique strings (`~str`) have been removed from the
6488 * `@str` has been removed from the language.
6489 * `@[T]` has been removed from the language.
6490 * `@self` has been removed from the language.
6491 * `@Trait` has been removed from the language.
6492 * Headers on `~` allocations which contain `@` boxes inside the type for
6493 reference counting have been removed.
6494 * The semantics around the lifetimes of temporary expressions have changed,
6495 see #3511 and #11585 for more information.
6496 * Cross-crate syntax extensions are now possible, but feature gated. See
6497 #11151 for more information. This includes both `macro_rules!` macros as
6498 well as syntax extensions such as `format!`.
6499 * New lint modes have been added, and older ones have been turned on to be
6501 * Unnecessary parentheses
6504 * Uppercase variables
6505 * Publicly visible private types
6506 * `#[deriving]` with raw pointers
6507 * Unsafe functions can no longer be coerced to closures.
6508 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6509 * The `#[simd]` attribute is now behind a feature gate.
6510 * Visibility is no longer allowed on `extern crate` statements, and
6511 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6512 * Trailing commas are now allowed in argument lists and tuple patterns.
6513 * The `do` keyword has been removed, it is now a reserved keyword.
6514 * Default type parameters have been implemented, but are feature gated.
6515 * Borrowed variables through captures in closures are now considered soundly.
6516 * `extern mod` is now `extern crate`
6517 * The `Freeze` trait has been removed.
6518 * The `Share` trait has been added for types that can be shared among
6520 * Labels in macros are now hygienic.
6521 * Expression/statement macro invocations can be delimited with `{}` now.
6522 * Treatment of types allowed in `static mut` locations has been tweaked.
6523 * The `*` and `.` operators are now overloadable through the `Deref` and
6525 * `~Trait` and `proc` no longer have `Send` bounds by default.
6526 * Partial type hints are now supported with the `_` type marker.
6527 * An `Unsafe` type was introduced for interior mutability. It is now
6528 considered undefined to transmute from `&T` to `&mut T` without using the
6530 * The #[linkage] attribute was implemented for extern statics/functions.
6531 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6532 * `Pod` was renamed to `Copy`.
6535 * The `libextra` library has been removed. It has now been decomposed into
6536 component libraries with smaller and more focused nuggets of
6537 functionality. The full list of libraries can be found on the
6538 documentation index page.
6539 * std: `std::condition` has been removed. All I/O errors are now propagated
6540 through the `Result` type. In order to assist with error handling, a
6541 `try!` macro for unwrapping errors with an early return and a lint for
6542 unused results has been added. See #12039 for more information.
6543 * std: The `vec` module has been renamed to `slice`.
6544 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6545 This will become the only growable vector in the future.
6546 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6547 are now found at `std::io::BufferedReader` instead of
6548 `std::io::buffered::BufferedReader`.
6549 * std: `print` and `println` are no longer in the prelude, the `print!` and
6550 `println!` macros are intended to be used instead.
6551 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6552 attempts to statically prevent cycles.
6553 * std: The standard distribution is adopting the policy of pushing failure
6554 to the user rather than failing in libraries. Many functions (such as
6555 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6556 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6557 deriving mode: `#[deriving(Show)]`.
6558 * std: `ToStr` is now implemented for all types implementing `Show`.
6559 * std: The formatting trait methods now take `&self` instead of `&T`
6560 * std: The `invert()` method on iterators has been renamed to `rev()`
6561 * std: `std::num` has seen a reduction in the genericity of its traits,
6562 consolidating functionality into a few core traits.
6563 * std: Backtraces are now printed on task failure if the environment
6564 variable `RUST_BACKTRACE` is present.
6565 * std: Naming conventions for iterators have been standardized. More details
6566 can be found on the wiki's style guide.
6567 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6568 still implement the function.
6569 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6570 * std: `assert_approx_eq!` has been removed
6571 * std: The `e` and `E` formatting specifiers for floats have been added to
6572 print them in exponential notation.
6573 * std: The `Times` trait has been removed
6574 * std: Indications of variance and opting out of builtin bounds is done
6575 through marker types in `std::kinds::marker` now
6576 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6577 `#[deriving(Hash)]` is now possible.
6578 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6579 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6580 * std: `Chan::new` is now `channel()`.
6581 * std: A new synchronous channel type has been implemented.
6582 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6583 * std: `hashmap` and `trie` have been moved to `libcollections`
6584 * std: `run` has been rolled into `io::process`
6585 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6586 * std: The equality and comparison traits have seen some reorganization.
6587 * std: `rand` has moved to `librand`.
6588 * std: `to_{lower,upper}case` has been implemented for `char`.
6589 * std: Logging has been moved to `liblog`.
6590 * collections: `HashMap` has been rewritten for higher performance and less
6592 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6593 it can be booted manually. The runtime guide has more information and
6595 * native: All I/O functionality except signals has been implemented.
6596 * green: Task spawning with `libgreen` has been optimized with stack caching
6597 and various trimming of code.
6598 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6599 * sync: The `extra::sync` module has been updated to modern rust (and moved
6600 to the `sync` library), tweaking and improving various interfaces while
6601 dropping redundant functionality.
6602 * sync: A new `Barrier` type has been added to the `sync` library.
6603 * sync: An efficient mutex for native and green tasks has been implemented.
6604 * serialize: The `base64` module has seen some improvement. It treats
6605 newlines better, has non-string error values, and has seen general
6607 * fourcc: A `fourcc!` macro was introduced
6608 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6609 hexadecimal literal.
6612 * `rustpkg` has been deprecated and removed from the main repository. Its
6613 replacement, `cargo`, is under development.
6614 * Nightly builds of rust are now available
6615 * The memory usage of rustc has been improved many times throughout this
6617 * The build process supports disabling rpath support for the rustc binary
6619 * Code generation has improved in some cases, giving more information to the
6620 LLVM optimization passes to enable more extensive optimizations.
6621 * Debuginfo compatibility with lldb on OSX has been restored.
6622 * The master branch is now gated on an android bot, making building for
6623 android much more reliable.
6624 * Output flags have been centralized into one `--emit` flag.
6625 * Crate type flags have been centralized into one `--crate-type` flag.
6626 * Codegen flags have been consolidated behind a `-C` flag.
6627 * Linking against outdated crates now has improved error messages.
6628 * Error messages with lifetimes will often suggest how to annotate the
6629 function to fix the error.
6630 * Many more types are documented in the standard library, and new guides
6632 * Many `rustdoc` improvements:
6633 * code blocks are syntax highlighted.
6634 * render standalone markdown files.
6635 * the --test flag tests all code blocks by default.
6636 * exported macros are displayed.
6637 * re-exported types have their documentation inlined at the location of the
6639 * search works across crates that have been rendered to the same output
6643 Version 0.9 (2014-01-09)
6644 ==========================
6646 * ~1800 changes, numerous bugfixes
6649 * The `float` type has been removed. Use `f32` or `f64` instead.
6650 * A new facility for enabling experimental features (feature gating) has
6651 been added, using the crate-level `#[feature(foo)]` attribute.
6652 * Managed boxes (@) are now behind a feature gate
6653 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6654 standard library's `Gc` or `Rc` types instead.
6655 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6656 * Jumping back to the top of a loop is now done with `continue` instead of
6658 * Strings can no longer be mutated through index assignment.
6659 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6660 hash delimiters, as in `r###"foo"###`.
6661 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6663 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6664 * `@fn`s have been removed.
6665 * `do` only works with procs in order to make it obvious what the cost
6667 * Single-element tuple-like structs can no longer be dereferenced to
6668 obtain the inner value. A more comprehensive solution for overloading
6669 the dereference operator will be provided in the future.
6670 * The `#[link(...)]` attribute has been replaced with
6671 `#[crate_id = "name#vers"]`.
6672 * Empty `impl`s must be terminated with empty braces and may not be
6673 terminated with a semicolon.
6674 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6675 no longer has any special meaning.
6676 * The old `fmt!` string formatting macro has been removed.
6677 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6678 `print!` and `println!`.
6679 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6680 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6681 `extern mod foo = "bar"` instead.
6682 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6683 * Macros can have attributes.
6684 * Macros can expand to items with attributes.
6685 * Macros can expand to multiple items.
6686 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6687 * Comments may be nested.
6688 * Values automatically coerce to trait objects they implement, without
6690 * Enum discriminants are no longer an entire word but as small as needed to
6691 contain all the variants. The `repr` attribute can be used to override
6692 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6693 `#[repr(C)]` to match C enums.
6694 * Non-string literals are not allowed in attributes (they never worked).
6695 * The FFI now supports variadic functions.
6696 * Octal numeric literals, as in `0o7777`.
6697 * The `concat!` syntax extension performs compile-time string concatenation.
6698 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6699 removed as Rust no longer uses segmented stacks.
6700 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6701 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6702 not `*`; ignoring remaining fields of a struct is also done with `..`,
6703 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6704 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6705 * `rustc` supports the "system" calling convention, which defaults to the
6706 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6708 * The `type_overflow` lint (default: warn) checks literals for overflow.
6709 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6710 * The `attribute_usage` lint (default: warn) warns about unknown
6712 * The `unknown_features` lint (default: warn) warns about unknown
6714 * The `dead_code` lint (default: warn) checks for dead code.
6715 * Rust libraries can be linked statically to one another
6716 * `#[link_args]` is behind the `link_args` feature gate.
6717 * Native libraries are now linked with `#[link(name = "foo")]`
6718 * Native libraries can be statically linked to a rust crate
6719 (`#[link(name = "foo", kind = "static")]`).
6720 * Native OS X frameworks are now officially supported
6721 (`#[link(name = "foo", kind = "framework")]`).
6722 * The `#[thread_local]` attribute creates thread-local (not task-local)
6723 variables. Currently behind the `thread_local` feature gate.
6724 * The `return` keyword may be used in closures.
6725 * Types that can be copied via a memcpy implement the `Pod` kind.
6726 * The `cfg` attribute can now be used on struct fields and enum variants.
6729 * std: The `option` and `result` API's have been overhauled to make them
6730 simpler, more consistent, and more composable.
6731 * std: The entire `std::io` module has been replaced with one that is
6732 more comprehensive and that properly interfaces with the underlying
6733 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6735 * std: `io::util` contains a number of useful implementations of
6736 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6737 `ZeroReader`, `TeeReader`.
6738 * std: The reference counted pointer type `extra::rc` moved into std.
6739 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6740 just a wrapper around it).
6741 * std: The `Either` type has been removed.
6742 * std: `fmt::Default` can be implemented for any type to provide default
6743 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6744 * std: The `rand` API continues to be tweaked.
6745 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6746 on failure in gdb, is now named `rust_fail`.
6747 * std: The `each_key` and `each_value` methods on `HashMap` have been
6748 replaced by the `keys` and `values` iterators.
6749 * std: Functions dealing with type size and alignment have moved from the
6750 `sys` module to the `mem` module.
6751 * std: The `path` module was written and API changed.
6752 * std: `str::from_utf8` has been changed to cast instead of allocate.
6753 * std: `starts_with` and `ends_with` methods added to vectors via the
6754 `ImmutableEqVector` trait, which is in the prelude.
6755 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6756 if the index is out of bounds.
6757 * std: Task failure no longer propagates between tasks, as the model was
6758 complex, expensive, and incompatible with thread-based tasks.
6759 * std: The `Any` type can be used for dynamic typing.
6760 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6762 * std: Methods that produce iterators generally do not have an `_iter`
6764 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6765 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6766 * std: `util::ignore` renamed to `prelude::drop`.
6767 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6769 * std: `vec::raw` has seen a lot of cleanup and API changes.
6770 * std: The standard library no longer includes any C++ code, and very
6771 minimal C, eliminating the dependency on libstdc++.
6772 * std: Runtime scheduling and I/O functionality has been factored out into
6773 extensible interfaces and is now implemented by two different crates:
6774 libnative, for native threading and I/O; and libgreen, for green threading
6775 and I/O. This paves the way for using the standard library in more limited
6776 embedded environments.
6777 * std: The `comm` module has been rewritten to be much faster, have a
6778 simpler, more consistent API, and to work for both native and green
6780 * std: All libuv dependencies have been moved into the rustuv crate.
6781 * native: New implementations of runtime scheduling on top of OS threads.
6782 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6784 * green: The green thread scheduler and message passing types are almost
6786 * extra: The `flatpipes` module had bitrotted and was removed.
6787 * extra: All crypto functions have been removed and Rust now has a policy of
6788 not reimplementing crypto in the standard library. In the future crypto
6789 will be provided by external crates with bindings to established libraries.
6790 * extra: `c_vec` has been modernized.
6791 * extra: The `sort` module has been removed. Use the `sort` method on
6795 * The `rust` and `rusti` commands have been removed, due to lack of
6797 * `rustdoc` was completely rewritten.
6798 * `rustdoc` can test code examples in documentation.
6799 * `rustpkg` can test packages with the argument, 'test'.
6800 * `rustpkg` supports arbitrary dependencies, including C libraries.
6801 * `rustc`'s support for generating debug info is improved again.
6802 * `rustc` has better error reporting for unbalanced delimiters.
6803 * `rustc`'s JIT support was removed due to bitrot.
6804 * Executables and static libraries can be built with LTO (-Z lto)
6805 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6809 Version 0.8 (2013-09-26)
6810 ============================
6812 * ~2200 changes, numerous bugfixes
6815 * The `for` loop syntax has changed to work with the `Iterator` trait.
6816 * At long last, unwinding works on Windows.
6817 * Default methods are ready for use.
6818 * Many trait inheritance bugs fixed.
6819 * Owned and borrowed trait objects work more reliably.
6820 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6821 * rustc can omit emission of code for the `debug!` macro if it is passed
6823 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6824 for foo.rs, then foo/mod.rs, and will generate an error when both are
6826 * Strings no longer contain trailing nulls. The new `std::c_str` module
6827 provides new mechanisms for converting to C strings.
6828 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6829 * The FFI has been overhauled such that foreign functions are called directly,
6830 instead of through a stack-switching wrapper.
6831 * Calling a foreign function must be done through a Rust function with the
6832 `#[fixed_stack_segment]` attribute.
6833 * The `externfn!` macro can be used to declare both a foreign function and
6834 a `#[fixed_stack_segment]` wrapper at once.
6835 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6836 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6837 * `priv` is disallowed everywhere except for struct fields and enum variants.
6838 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6839 * `ref` bindings in irrefutable patterns work correctly now.
6840 * `char` is now prevented from containing invalid code points.
6841 * Casting to `bool` is no longer allowed.
6842 * `\0` is now accepted as an escape in chars and strings.
6843 * `yield` is a reserved keyword.
6844 * `typeof` is a reserved keyword.
6845 * Crates may be imported by URL with `extern mod foo = "url";`.
6846 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6847 * Static vectors can be initialized with repeating elements,
6848 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6849 * Static structs can be initialized with functional record update,
6850 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6851 * `cfg!` can be used to conditionally execute code based on the crate
6852 configuration, similarly to `#[cfg(...)]`.
6853 * The `unnecessary_qualification` lint detects unneeded module
6854 prefixes (default: allow).
6855 * Arithmetic operations have been implemented on the SIMD types in
6856 `std::unstable::simd`.
6857 * Exchange allocation headers were removed, reducing memory usage.
6858 * `format!` implements a completely new, extensible, and higher-performance
6859 string formatting system. It will replace `fmt!`.
6860 * `print!` and `println!` write formatted strings (using the `format!`
6861 extension) to stdout.
6862 * `write!` and `writeln!` write formatted strings (using the `format!`
6863 extension) to the new Writers in `std::rt::io`.
6864 * The library section in which a function or static is placed may
6865 be specified with `#[link_section = "..."]`.
6866 * The `proto!` syntax extension for defining bounded message protocols
6868 * `macro_rules!` is hygienic for `let` declarations.
6869 * The `#[export_name]` attribute specifies the name of a symbol.
6870 * `unreachable!` can be used to indicate unreachable code, and fails
6874 * std: Transitioned to the new runtime, written in Rust.
6875 * std: Added an experimental I/O library, `rt::io`, based on the new
6877 * std: A new generic `range` function was added to the prelude, replacing
6878 `uint::range` and friends.
6879 * std: `range_rev` no longer exists. Since range is an iterator it can be
6880 reversed with `range(lo, hi).invert()`.
6881 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6882 renamed to `unwrap_or`.
6883 * std: The `iterator` module was renamed to `iter`.
6884 * std: Integral types now support the `checked_add`, `checked_sub`, and
6885 `checked_mul` operations for detecting overflow.
6886 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6888 * std: Methods are standardizing on conventions for casting methods:
6889 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6891 * std: The `CString` type in `c_str` provides new ways to convert to and
6893 * std: `DoubleEndedIterator` can yield elements in two directions.
6894 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6896 * std: `str::from_bytes` renamed to `str::from_utf8`.
6897 * std: `pop_opt` and `shift_opt` methods added to vectors.
6898 * std: The task-local data interface no longer uses @, and keys are
6899 no longer function pointers.
6900 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6901 * std: Added `SharedPort` to `comm`.
6902 * std: `Eq` has a default method for `ne`; only `eq` is required
6904 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6905 is required in implementations.
6906 * std: `is_utf8` performance is improved, impacting many string functions.
6907 * std: `os::MemoryMap` provides cross-platform mmap.
6908 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6909 are not 'in-bounds' are considered undefined.
6910 * std: Many freestanding functions in `vec` removed in favor of methods.
6911 * std: Many freestanding functions on scalar types removed in favor of
6913 * std: Many options to task builders were removed since they don't make
6914 sense in the new scheduler design.
6915 * std: More containers implement `FromIterator` so can be created by the
6917 * std: More complete atomic types in `unstable::atomics`.
6918 * std: `comm::PortSet` removed.
6919 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6920 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6921 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6922 default implementations.
6923 * std: Various `from_str` functions were removed in favor of a generic
6924 `from_str` which is available in the prelude.
6925 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6926 * extra: `dlist`, the doubly-linked list was modernized.
6927 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6928 * extra: Added `glob` module, replacing `std::os::glob`.
6929 * extra: `rope` was removed.
6930 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6931 * extra: `net`, and `timer` were removed. The experimental replacements
6932 are `std::rt::io::net` and `std::rt::io::timer`.
6933 * extra: Iterators implemented for `SmallIntMap`.
6934 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6935 * extra: `SmallIntSet` removed. Use `BitvSet`.
6936 * extra: Performance of JSON parsing greatly improved.
6937 * extra: `semver` updated to SemVer 2.0.0.
6938 * extra: `term` handles more terminals correctly.
6939 * extra: `dbg` module removed.
6940 * extra: `par` module removed.
6941 * extra: `future` was cleaned up, with some method renames.
6942 * extra: Most free functions in `getopts` were converted to methods.
6945 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6946 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6947 similarly to gcc's `--march` flag.
6948 * rustc's performance compiling small crates is much better.
6949 * rustpkg has received many improvements.
6950 * rustpkg supports git tags as package IDs.
6951 * rustpkg builds into target-specific directories so it can be used for
6953 * The number of concurrent test tasks is controlled by the environment
6954 variable RUST_TEST_TASKS.
6955 * The test harness can now report metrics for benchmarks.
6956 * All tools have man pages.
6957 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6958 * The runtime uses jemalloc for allocations.
6959 * Segmented stacks are temporarily disabled as part of the transition to
6960 the new runtime. Stack overflows are possible!
6961 * A new documentation backend, rustdoc_ng, is available for use. It is
6962 still invoked through the normal `rustdoc` command.
6965 Version 0.7 (2013-07-03)
6966 =======================
6968 * ~2000 changes, numerous bugfixes
6971 * `impl`s no longer accept a visibility qualifier. Put them on methods
6973 * The borrow checker has been rewritten with flow-sensitivity, fixing
6974 many bugs and inconveniences.
6975 * The `self` parameter no longer implicitly means `&'self self`,
6976 and can be explicitly marked with a lifetime.
6977 * Overloadable compound operators (`+=`, etc.) have been temporarily
6978 removed due to bugs.
6979 * The `for` loop protocol now requires `for`-iterators to return `bool`
6980 so they compose better.
6981 * The `Durable` trait is replaced with the `'static` bounds.
6982 * Trait default methods work more often.
6983 * Structs with the `#[packed]` attribute have byte alignment and
6984 no padding between fields.
6985 * Type parameters bound by `Copy` must now be copied explicitly with
6987 * It is now illegal to move out of a dereferenced unsafe pointer.
6988 * `Option<~T>` is now represented as a nullable pointer.
6989 * `@mut` does dynamic borrow checks correctly.
6990 * The `main` function is only detected at the topmost level of the crate.
6991 The `#[main]` attribute is still valid anywhere.
6992 * Struct fields may no longer be mutable. Use inherited mutability.
6993 * The `#[no_send]` attribute makes a type that would otherwise be
6995 * The `#[no_freeze]` attribute makes a type that would otherwise be
6997 * Unbounded recursion will abort the process after reaching the limit
6998 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6999 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7000 are never implicitly copyable.
7001 * `#[static_assert]` makes compile-time assertions about static bools.
7002 * At long last, 'argument modes' no longer exist.
7003 * The rarely used `use mod` statement no longer exists.
7006 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
7008 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
7009 `Rand`, `Zero` and `ToStr` can all be automatically derived with
7011 * The `bytes!` macro returns a vector of bytes for string, u8, char,
7012 and unsuffixed integer literals.
7015 * The `core` crate was renamed to `std`.
7016 * The `std` crate was renamed to `extra`.
7017 * More and improved documentation.
7018 * std: `iterator` module for external iterator objects.
7019 * Many old-style (internal, higher-order function) iterators replaced by
7020 implementations of `Iterator`.
7021 * std: Many old internal vector and string iterators,
7022 incl. `any`, `all`. removed.
7023 * std: The `finalize` method of `Drop` renamed to `drop`.
7024 * std: The `drop` method now takes `&mut self` instead of `&self`.
7025 * std: The prelude no longer re-exports any modules, only types and traits.
7026 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
7027 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
7028 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
7029 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
7030 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
7031 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
7032 * std: Many types implement `Clone`.
7033 * std: `path` type renamed to `Path`.
7034 * std: `mut` module and `Mut` type removed.
7035 * std: Many standalone functions removed in favor of methods and iterators
7036 in `vec`, `str`. In the future methods will also work as functions.
7037 * std: `reinterpret_cast` removed. Use `transmute`.
7038 * std: ascii string handling in `std::ascii`.
7039 * std: `Rand` is implemented for ~/@.
7040 * std: `run` module for spawning processes overhauled.
7041 * std: Various atomic types added to `unstable::atomic`.
7042 * std: Various types implement `Zero`.
7043 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
7044 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
7045 * std: Added `os::mkdir_recursive`.
7046 * std: Added `os::glob` function performs filesystems globs.
7047 * std: `FuzzyEq` renamed to `ApproxEq`.
7048 * std: `Map` now defines `pop` and `swap` methods.
7049 * std: `Cell` constructors converted to static methods.
7050 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
7051 * extra: `flate` module moved from `std` to `extra`.
7052 * extra: `fileinput` module for iterating over a series of files.
7053 * extra: `Complex` number type and `complex` module.
7054 * extra: `Rational` number type and `rational` module.
7055 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
7056 * extra: `term` uses terminfo now, is more correct.
7057 * extra: `arc` functions converted to methods.
7058 * extra: Implementation of fixed output size variations of SHA-2.
7061 * `unused_variable` lint mode for unused variables (default: warn).
7062 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
7064 * `unused_mut` lint mode for identifying unused `mut` qualifiers
7066 * `dead_assignment` lint mode for unread variables (default: warn).
7067 * `unnecessary_allocation` lint mode detects some heap allocations that are
7068 immediately borrowed so could be written without allocating (default: warn).
7069 * `missing_doc` lint mode (default: allow).
7070 * `unreachable_code` lint mode (default: warn).
7071 * The `rusti` command has been rewritten and a number of bugs addressed.
7072 * rustc outputs in color on more terminals.
7073 * rustc accepts a `--link-args` flag to pass arguments to the linker.
7074 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
7075 * Compiling with `-g` will make the binary record information about
7076 dynamic borrowcheck failures for debugging.
7077 * rustdoc has a nicer stylesheet.
7078 * Various improvements to rustdoc.
7079 * Improvements to rustpkg (see the detailed release notes).
7082 Version 0.6 (2013-04-03)
7083 ========================
7085 * ~2100 changes, numerous bugfixes
7088 * The self type parameter in traits is now spelled `Self`
7089 * The `self` parameter in trait and impl methods must now be explicitly
7090 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
7091 * Static methods no longer require the `static` keyword and instead
7092 are distinguished by the lack of a `self` parameter
7093 * Replaced the `Durable` trait with the `'static` lifetime
7094 * The old closure type syntax with the trailing sigil has been
7095 removed in favor of the more consistent leading sigil
7096 * `super` is a keyword, and may be prefixed to paths
7097 * Trait bounds are separated with `+` instead of whitespace
7098 * Traits are implemented with `impl Trait for Type`
7099 instead of `impl Type: Trait`
7100 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
7101 * The `export` keyword has finally been removed
7102 * The `move` keyword has been removed (see "Semantic changes")
7103 * The interior mutability qualifier on vectors, `[mut T]`, has been
7104 removed. Use `&mut [T]`, etc.
7105 * `mut` is no longer valid in `~mut T`. Use inherited mutability
7106 * `fail` is no longer a keyword. Use `fail!()`
7107 * `assert` is no longer a keyword. Use `assert!()`
7108 * `log` is no longer a keyword. use `debug!`, etc.
7109 * 1-tuples may be represented as `(T,)`
7110 * Struct fields may no longer be `mut`. Use inherited mutability,
7111 `@mut T`, `core::mut` or `core::cell`
7112 * `extern mod { ... }` is no longer valid syntax for foreign
7113 function modules. Use extern blocks: `extern { ... }`
7114 * Newtype enums removed. Use tuple-structs.
7115 * Trait implementations no longer support visibility modifiers
7116 * Pattern matching over vectors improved and expanded
7117 * `const` renamed to `static` to correspond to lifetime name,
7118 and make room for future `static mut` unsafe mutable globals.
7119 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
7120 * `Clone` implementations can be automatically generated with
7121 `#[deriving(Clone)]`
7122 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
7123 instead of `foo as Bar`.
7124 * Fixed length vector types are now written as `[int, .. 3]`
7125 instead of `[int * 3]`.
7126 * Fixed length vector types can express the length as a constant
7127 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7130 * Types with owned pointers or custom destructors move by default,
7131 eliminating the `move` keyword
7132 * All foreign functions are considered unsafe
7133 * &mut is now unaliasable
7134 * Writes to borrowed @mut pointers are prevented dynamically
7136 * The name of the main function can be customized using #[main]
7137 * The default type of an inferred closure is &fn instead of @fn
7138 * `use` statements may no longer be "chained" - they cannot import
7139 identifiers imported by previous `use` statements
7140 * `use` statements are crate relative, importing from the "top"
7141 of the crate by default. Paths may be prefixed with `super::`
7142 or `self::` to change the search behavior.
7143 * Method visibility is inherited from the implementation declaration
7144 * Structural records have been removed
7145 * Many more types can be used in static items, including enums
7146 'static-lifetime pointers and vectors
7147 * Pattern matching over vectors improved and expanded
7148 * Typechecking of closure types has been overhauled to
7149 improve inference and eliminate unsoundness
7150 * Macros leave scope at the end of modules, unless that module is
7151 tagged with #[macro_escape]
7154 * Added big integers to `std::bigint`
7155 * Removed `core::oldcomm` module
7156 * Added pipe-based `core::comm` module
7157 * Numeric traits have been reorganized under `core::num`
7158 * `vec::slice` finally returns a slice
7159 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7160 * Containers reorganized around traits in `core::container`
7161 * `core::dvec` removed, `~[T]` is a drop-in replacement
7162 * `core::send_map` renamed to `core::hashmap`
7163 * `std::map` removed; replaced with `core::hashmap`
7164 * `std::treemap` reimplemented as an owned balanced tree
7165 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7166 * `core::trie` added as a fast ordered map for integer keys
7167 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7168 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7169 overload the comparison operators, whereas `TotalOrd` is used
7170 by certain container types
7173 * Replaced the 'cargo' package manager with 'rustpkg'
7174 * Added all-purpose 'rust' tool
7175 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7176 * rustc now *attempts* to offer spelling suggestions
7177 * Improved support for ARM and Android
7178 * Preliminary MIPS backend
7179 * Improved foreign function ABI implementation for x86, x86_64
7180 * Various memory usage improvements
7181 * Rust code may be embedded in foreign code under limited circumstances
7182 * Inline assembler supported by new asm!() syntax extension.
7185 Version 0.5 (2012-12-21)
7186 ===========================
7188 * ~900 changes, numerous bugfixes
7191 * Removed `<-` move operator
7192 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7193 * Removed old fixed length vector syntax - `[T]/N`
7194 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7195 * Macros may now expand to items and statements
7196 * `a.b()` is always parsed as a method call, never as a field projection
7197 * `Eq` and `IterBytes` implementations can be automatically generated
7198 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7199 * Removed the special crate language for `.rc` files
7200 * Function arguments may consist of any irrefutable pattern
7203 * `&` and `~` pointers may point to objects
7204 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7205 * Enum variants may be structs
7206 * Destructors can be added to all nominal types with the Drop trait
7207 * Structs and nullary enum variants may be constants
7208 * Values that cannot be implicitly copied are now automatically moved
7209 without writing `move` explicitly
7210 * `&T` may now be coerced to `*T`
7211 * Coercions happen in `let` statements as well as function calls
7212 * `use` statements now take crate-relative paths
7213 * The module and type namespaces have been merged so that static
7214 method names can be resolved under the trait in which they are
7217 * Improved support for language features
7218 * Trait inheritance works in many scenarios
7219 * More support for explicit self arguments in methods - `self`, `&self`
7220 `@self`, and `~self` all generally work as expected
7221 * Static methods work in more situations
7222 * Experimental: Traits may declare default methods for the implementations
7226 * New condition handling system in `core::condition`
7227 * Timsort added to `std::sort`
7228 * New priority queue, `std::priority_queue`
7229 * Pipes for serializable types, `std::flatpipes'
7230 * Serialization overhauled to be trait-based
7231 * Expanded `getopts` definitions
7232 * Moved futures to `std`
7233 * More functions are pure now
7234 * `core::comm` renamed to `oldcomm`. Still deprecated
7235 * `rustdoc` and `cargo` are libraries now
7238 * Added a preliminary REPL, `rusti`
7239 * License changed from MIT to dual MIT/APL2
7242 Version 0.4 (2012-10-15)
7243 ==========================
7245 * ~2000 changes, numerous bugfixes
7248 * All keywords are now strict and may not be used as identifiers anywhere
7249 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7250 'of', 'with', 'to', 'class'.
7251 * Classes are replaced with simpler structs
7252 * Explicit method self types
7253 * `ret` became `return` and `alt` became `match`
7254 * `import` is now `use`; `use is now `extern mod`
7255 * `extern mod { ... }` is now `extern { ... }`
7256 * `use mod` is the recommended way to import modules
7257 * `pub` and `priv` replace deprecated export lists
7258 * The syntax of `match` pattern arms now uses fat arrow (=>)
7259 * `main` no longer accepts an args vector; use `os::args` instead
7262 * Trait implementations are now coherent, ala Haskell typeclasses
7263 * Trait methods may be static
7264 * Argument modes are deprecated
7265 * Borrowed pointers are much more mature and recommended for use
7266 * Strings and vectors in the static region are stored in constant memory
7267 * Typestate was removed
7268 * Resolution rewritten to be more reliable
7269 * Support for 'dual-mode' data structures (freezing and thawing)
7272 * Most binary operators can now be overloaded via the traits in
7274 * `std::net::url` for representing URLs
7275 * Sendable hash maps in `core::send_map`
7276 * `core::task' gained a (currently unsafe) task-local storage API
7279 * An efficient new intertask communication primitive called the pipe,
7280 along with a number of higher-level channel types, in `core::pipes`
7281 * `std::arc`, an atomically reference counted, immutable, shared memory
7283 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7284 * Futures are now based on pipes and sendable
7285 * More robust linked task failure
7286 * Improved task builder API
7289 * Improved error reporting
7290 * Preliminary JIT support
7291 * Preliminary work on precise GC
7292 * Extensive architectural improvements to rustc
7293 * Begun a transition away from buggy C++-based reflection (shape) code to
7294 Rust-based (visitor) code
7295 * All hash functions and tables converted to secure, randomized SipHash
7298 Version 0.3 (2012-07-12)
7299 ========================
7301 * ~1900 changes, numerous bugfixes
7303 * New coding conveniences
7304 * Integer-literal suffix inference
7305 * Per-item control over warnings, errors
7306 * #[cfg(windows)] and #[cfg(unix)] attributes
7307 * Documentation comments
7308 * More compact closure syntax
7309 * 'do' expressions for treating higher-order functions as
7311 * *-patterns (wildcard extended to all constructor fields)
7314 * Name resolution pass and exhaustiveness checker rewritten
7315 * Region pointers and borrow checking supersede alias
7317 * Init-ness checking is now provided by a region-based liveness
7318 pass instead of the typestate pass; same for last-use analysis
7319 * Extensive work on region pointers
7321 * Experimental new language features
7322 * Slices and fixed-size, interior-allocated vectors
7323 * #!-comments for lang versioning, shell execution
7324 * Destructors and iface implementation for classes;
7325 type-parameterized classes and class methods
7326 * 'const' type kind for types that can be used to implement
7327 shared-memory concurrency patterns
7331 * Removal of various obsolete features
7332 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7333 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7335 * Constructs: do-while loops ('do' repurposed), fn binding,
7336 resources (replaced by destructors)
7338 * Compiler reorganization
7339 * Syntax-layer of compiler split into separate crate
7340 * Clang (from LLVM project) integrated into build
7341 * Typechecker split into sub-modules
7344 * New time functions
7345 * Extension methods for many built-in types
7346 * Arc: atomic-refcount read-only / exclusive-use shared cells
7347 * Par: parallel map and search routines
7348 * Extensive work on libuv interface
7349 * Much vector code moved to libraries
7350 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7351 #include, #include_str, #include_bin
7354 * Cargo automatically resolves dependencies
7357 Version 0.2 (2012-03-29)
7358 =========================
7360 * >1500 changes, numerous bugfixes
7362 * New docs and doc tooling
7364 * New port: FreeBSD x86_64
7366 * Compilation model enhancements
7367 * Generics now specialized, multiply instantiated
7368 * Functions now inlined across separate crates
7370 * Scheduling, stack and threading fixes
7371 * Noticeably improved message-passing performance
7372 * Explicit schedulers
7376 * Experimental new language features
7377 * Operator overloading
7381 * Various language extensions
7382 * C-callback function types: 'crust fn ...'
7383 * Infinite-loop construct: 'loop { ... }'
7384 * Shorten 'mutable' to 'mut'
7385 * Required mutable-local qualifier: 'let mut ...'
7386 * Basic glob-exporting: 'export foo::*;'
7387 * Alt now exhaustive, 'alt check' for runtime-checked
7388 * Block-function form of 'for' loop, with 'break' and 'ret'.
7391 * AST quasi-quote syntax extension
7392 * Revived libuv interface
7393 * New modules: core::{future, iter}, std::arena
7394 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7395 * Extensive cleanup, regularization in libstd, libcore
7398 Version 0.1 (2012-01-20)
7399 ===============================
7401 * Most language features work, including:
7402 * Unique pointers, unique closures, move semantics
7403 * Interface-constrained generics
7404 * Static interface dispatch
7406 * Multithread task scheduling
7407 * Typestate predicates
7408 * Failure unwinding, destructors
7409 * Pattern matching and destructuring assignment
7410 * Lightweight block-lambda syntax
7411 * Preliminary macro-by-example
7413 * Compiler works with the following configurations:
7414 * Linux: x86 and x86_64 hosts and targets
7415 * macOS: x86 and x86_64 hosts and targets
7416 * Windows: x86 hosts and targets
7418 * Cross compilation / multi-target configuration supported.
7420 * Preliminary API-documentation and package-management tools included.
7424 * Documentation is incomplete.
7426 * Performance is below intended target.
7428 * Standard library APIs are subject to extensive change, reorganization.
7430 * Language-level versioning is not yet operational - future code will