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="apple")] fn main() { println!("Hello Apple!"); }`
8 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
9 E.g. You can have match statement on a `u8` that covers `0..=255` and
10 you would no longer be required to have a `_ => unreachable!()` case.
11 - [You can now have multiple patterns in `if let` and `while let`
12 expressions.][57532] You can do this with the same syntax as a `match`
22 let state = Creature::Crab("Ferris");
24 if let Creature::Crab(name) | Creature::Person(name) = state {
25 println!("This creature's name is: {}", name);
29 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
30 this feature will by default produce a warning as this behaviour can be
31 unintuitive. E.g. `if let _ = 5 {}`
32 - [You can now use `let` bindings, assignments, expression statements,
33 and irrefutable pattern destructuring in const functions.][57175]
34 - [You can now call unsafe const functions.][57067] E.g.
36 const unsafe fn foo() -> i32 { 5 }
37 const fn bar() -> i32 {
41 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
42 E.g. `#[cfg_attr(all(), must_use, optimize)]`
43 - [You can now specify a specific alignment with the `#[repr(packed)]`
44 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
45 with an alignment of 2 bytes and a size of 6 bytes.
46 - [You can now import an item from a module as an `_`.][56303] This allows you to
47 import a trait's impls, and not have the name in the namespace. E.g.
49 use std::io::Read as _;
51 // Allowed as there is only one `Read` in the module.
54 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
58 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
59 command line argument.][56351]
60 - [The mininum required LLVM version has been bumped to 6.0.][56642]
61 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
62 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
63 tier 2 support.][57130] Visit the [platform support][platform-support] page for
64 information on Rust's platform support.
65 - [Added support for the `thumbv7neon-linux-androideabi` and
66 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
67 - [Added support for the `x86_64-unknown-uefi` target.][56769]
71 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
72 functions for all numeric types.][57566]
73 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
74 are now `const` functions for all numeric types.][57105]
75 - [The methods `is_positive` and `is_negative` are now `const` functions for
76 all signed numeric types.][57105]
77 - [The `get` method for all `NonZero` types is now `const`.][57167]
78 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
79 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
80 numeric types.][57234]
81 - [`Ipv4Addr::new` is now a `const` function][57234]
85 - [`unix::FileExt::read_exact_at`]
86 - [`unix::FileExt::write_all_at`]
87 - [`Option::transpose`]
88 - [`Result::transpose`]
89 - [`convert::identity`]
92 - [`marker::PhantomPinned`]
93 - [`Vec::resize_with`]
94 - [`VecDeque::resize_with`]
95 - [`Duration::as_millis`]
96 - [`Duration::as_micros`]
97 - [`Duration::as_nanos`]
102 - [Cargo should now rebuild a crate if a file was modified during the initial
107 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
108 are now deprecated in the standard library, and their usage will now produce a warning.
109 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
111 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
114 [55982]: https://github.com/rust-lang/rust/pull/55982/
115 [56303]: https://github.com/rust-lang/rust/pull/56303/
116 [56351]: https://github.com/rust-lang/rust/pull/56351/
117 [56362]: https://github.com/rust-lang/rust/pull/56362
118 [56642]: https://github.com/rust-lang/rust/pull/56642/
119 [56769]: https://github.com/rust-lang/rust/pull/56769/
120 [56805]: https://github.com/rust-lang/rust/pull/56805
121 [56947]: https://github.com/rust-lang/rust/pull/56947/
122 [57049]: https://github.com/rust-lang/rust/pull/57049/
123 [57067]: https://github.com/rust-lang/rust/pull/57067/
124 [57105]: https://github.com/rust-lang/rust/pull/57105
125 [57130]: https://github.com/rust-lang/rust/pull/57130/
126 [57167]: https://github.com/rust-lang/rust/pull/57167/
127 [57175]: https://github.com/rust-lang/rust/pull/57175/
128 [57234]: https://github.com/rust-lang/rust/pull/57234/
129 [57332]: https://github.com/rust-lang/rust/pull/57332/
130 [57465]: https://github.com/rust-lang/rust/pull/57465/
131 [57532]: https://github.com/rust-lang/rust/pull/57532/
132 [57535]: https://github.com/rust-lang/rust/pull/57535/
133 [57566]: https://github.com/rust-lang/rust/pull/57566/
134 [57615]: https://github.com/rust-lang/rust/pull/57615/
135 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
136 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
137 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
138 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
139 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
140 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
141 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
142 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
143 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
144 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
145 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
146 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
147 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
148 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
149 [platform-support]: https://forge.rust-lang.org/platform-support.html
151 Version 1.32.0 (2019-01-17)
152 ==========================
157 - [You can now use the `?` operator in macro definitions.][56245] The `?`
158 operator allows you to specify zero or one repetitions similar to the `*` and
160 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
161 now always resolve to the item (`enum`, `struct`, etc.) available in the
162 module if present, before resolving to a external crate or an item the prelude.][56759]
165 enum Color { Red, Green, Blue }
171 - [You can now match against `PhantomData<T>` types.][55837]
172 - [You can now match against literals in macros with the `literal`
173 specifier.][56072] This will match against a literal of any type.
174 E.g. `1`, `'A'`, `"Hello World"`
175 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
177 struct Point(i32, i32);
180 pub fn new(x: i32, y: i32) -> Self {
184 pub fn is_origin(&self) -> bool {
192 - [Self can also now be used in type definitions.][56366] E.g.
196 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
199 Cons(T, Box<Self>) // likewise here
202 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
203 a `impl Trait` or `dyn Trait` is returned and unused in the program.
207 - [The default allocator has changed from jemalloc to the default allocator on
208 your system.][55238] The compiler itself on Linux & macOS will still use
209 jemalloc, but programs compiled with it will use the system allocator.
210 - [Added the `aarch64-pc-windows-msvc` target.][55702]
214 - [`PathBuf` now implements `FromStr`.][55148]
215 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
216 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
217 easily debug expressions in your rust program. E.g.
220 let b = dbg!(a * 2) + 1;
221 // ^-- prints: [src/main.rs:4] a * 2 = 4
225 The following APIs are now `const` functions and can be used in a
229 - [`UnsafeCell::get`]
232 - [`ManuallyDrop::new`]
233 - [`ManuallyDrop::into_inner`]
234 - [`RangeInclusive::start`]
235 - [`RangeInclusive::end`]
236 - [`NonNull::as_ptr`]
239 - [`Duration::as_secs`]
240 - [`Duration::subsec_millis`]
241 - [`Duration::subsec_micros`]
242 - [`Duration::subsec_nanos`]
244 - [`Ipv4Addr::is_unspecified`]
246 - [`Ipv6Addr::octets`]
250 - [`i8::to_be_bytes`]
251 - [`i8::to_le_bytes`]
252 - [`i8::to_ne_bytes`]
253 - [`i8::from_be_bytes`]
254 - [`i8::from_le_bytes`]
255 - [`i8::from_ne_bytes`]
256 - [`i16::to_be_bytes`]
257 - [`i16::to_le_bytes`]
258 - [`i16::to_ne_bytes`]
259 - [`i16::from_be_bytes`]
260 - [`i16::from_le_bytes`]
261 - [`i16::from_ne_bytes`]
262 - [`i32::to_be_bytes`]
263 - [`i32::to_le_bytes`]
264 - [`i32::to_ne_bytes`]
265 - [`i32::from_be_bytes`]
266 - [`i32::from_le_bytes`]
267 - [`i32::from_ne_bytes`]
268 - [`i64::to_be_bytes`]
269 - [`i64::to_le_bytes`]
270 - [`i64::to_ne_bytes`]
271 - [`i64::from_be_bytes`]
272 - [`i64::from_le_bytes`]
273 - [`i64::from_ne_bytes`]
274 - [`i128::to_be_bytes`]
275 - [`i128::to_le_bytes`]
276 - [`i128::to_ne_bytes`]
277 - [`i128::from_be_bytes`]
278 - [`i128::from_le_bytes`]
279 - [`i128::from_ne_bytes`]
280 - [`isize::to_be_bytes`]
281 - [`isize::to_le_bytes`]
282 - [`isize::to_ne_bytes`]
283 - [`isize::from_be_bytes`]
284 - [`isize::from_le_bytes`]
285 - [`isize::from_ne_bytes`]
286 - [`u8::to_be_bytes`]
287 - [`u8::to_le_bytes`]
288 - [`u8::to_ne_bytes`]
289 - [`u8::from_be_bytes`]
290 - [`u8::from_le_bytes`]
291 - [`u8::from_ne_bytes`]
292 - [`u16::to_be_bytes`]
293 - [`u16::to_le_bytes`]
294 - [`u16::to_ne_bytes`]
295 - [`u16::from_be_bytes`]
296 - [`u16::from_le_bytes`]
297 - [`u16::from_ne_bytes`]
298 - [`u32::to_be_bytes`]
299 - [`u32::to_le_bytes`]
300 - [`u32::to_ne_bytes`]
301 - [`u32::from_be_bytes`]
302 - [`u32::from_le_bytes`]
303 - [`u32::from_ne_bytes`]
304 - [`u64::to_be_bytes`]
305 - [`u64::to_le_bytes`]
306 - [`u64::to_ne_bytes`]
307 - [`u64::from_be_bytes`]
308 - [`u64::from_le_bytes`]
309 - [`u64::from_ne_bytes`]
310 - [`u128::to_be_bytes`]
311 - [`u128::to_le_bytes`]
312 - [`u128::to_ne_bytes`]
313 - [`u128::from_be_bytes`]
314 - [`u128::from_le_bytes`]
315 - [`u128::from_ne_bytes`]
316 - [`usize::to_be_bytes`]
317 - [`usize::to_le_bytes`]
318 - [`usize::to_ne_bytes`]
319 - [`usize::from_be_bytes`]
320 - [`usize::from_le_bytes`]
321 - [`usize::from_ne_bytes`]
325 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
326 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
330 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
334 - [The argument types for AVX's
335 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
336 been changed from `*const` to `*mut` as the previous implementation
340 [55148]: https://github.com/rust-lang/rust/pull/55148/
341 [55238]: https://github.com/rust-lang/rust/pull/55238/
342 [55280]: https://github.com/rust-lang/rust/pull/55280/
343 [55610]: https://github.com/rust-lang/rust/pull/55610/
344 [55663]: https://github.com/rust-lang/rust/pull/55663/
345 [55702]: https://github.com/rust-lang/rust/pull/55702/
346 [55837]: https://github.com/rust-lang/rust/pull/55837/
347 [55843]: https://github.com/rust-lang/rust/pull/55843/
348 [56072]: https://github.com/rust-lang/rust/pull/56072/
349 [56245]: https://github.com/rust-lang/rust/pull/56245/
350 [56365]: https://github.com/rust-lang/rust/pull/56365/
351 [56366]: https://github.com/rust-lang/rust/pull/56366/
352 [56395]: https://github.com/rust-lang/rust/pull/56395/
353 [56759]: https://github.com/rust-lang/rust/pull/56759/
354 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
355 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
356 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
357 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
358 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
359 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
360 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
361 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
362 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
363 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
364 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
365 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
366 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
367 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
368 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
369 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
370 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
371 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
372 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
373 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
374 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
375 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
376 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
377 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
378 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
379 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
380 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
381 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
382 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
383 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
384 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
385 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
386 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
387 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
388 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
389 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
390 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
391 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
392 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
393 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
394 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
395 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
396 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
397 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
398 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
399 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
400 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
401 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
402 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
403 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
404 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
405 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
406 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
407 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
408 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
409 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
410 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
411 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
412 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
413 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
414 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
415 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
416 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
417 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
418 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
419 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
420 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
421 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
422 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
423 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
424 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
425 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
426 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
427 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
428 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
429 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
430 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
431 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
432 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
433 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
434 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
435 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
436 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
437 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
438 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
439 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
440 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
441 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
442 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
443 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
444 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
445 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
446 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
449 Version 1.31.1 (2018-12-20)
450 ===========================
452 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
453 - [Fix broken go-to-definition in RLS][rls/1171]
454 - [Fix infinite loop on hover in RLS][rls/1170]
456 [56562]: https://github.com/rust-lang/rust/pull/56562
457 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
458 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
460 Version 1.31.0 (2018-12-06)
461 ==========================
465 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
466 - [New lifetime elision rules now allow for eliding lifetimes in functions and
467 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
468 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
470 - [You can now define and use `const` functions.][54835] These are currently
471 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
472 [language reference][const-reference] for what exactly is available.
473 - [You can now use tool lints, which allow you to scope lints from external
474 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
475 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
476 a crate, not just in exported functions.][54451]
477 - [You can now use parentheses in pattern matches.][54497]
481 - [Updated musl to 1.1.20][54430]
485 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
486 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
487 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
488 into `Option<&mut T>` using the `From` trait.][53218]
489 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
494 - [`slice::align_to`]
495 - [`slice::align_to_mut`]
496 - [`slice::chunks_exact`]
497 - [`slice::chunks_exact_mut`]
499 - [`slice::rchunks_mut`]
500 - [`slice::rchunks_exact`]
501 - [`slice::rchunks_exact_mut`]
502 - [`Option::replace`]
506 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
507 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
508 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
510 [52813]: https://github.com/rust-lang/rust/pull/52813/
511 [53218]: https://github.com/rust-lang/rust/pull/53218/
512 [53555]: https://github.com/rust-lang/rust/issues/53555/
513 [54057]: https://github.com/rust-lang/rust/pull/54057/
514 [54240]: https://github.com/rust-lang/rust/pull/54240/
515 [54430]: https://github.com/rust-lang/rust/pull/54430/
516 [54451]: https://github.com/rust-lang/rust/pull/54451/
517 [54497]: https://github.com/rust-lang/rust/pull/54497/
518 [54778]: https://github.com/rust-lang/rust/pull/54778/
519 [54835]: https://github.com/rust-lang/rust/pull/54835/
520 [54870]: https://github.com/rust-lang/rust/pull/54870/
521 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
522 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
523 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
524 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
525 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
526 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
527 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
528 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
529 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
530 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
531 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
532 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
533 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
534 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
536 Version 1.30.1 (2018-11-08)
537 ===========================
539 - [Fixed overflow ICE in rustdoc][54199]
540 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
542 [54199]: https://github.com/rust-lang/rust/pull/54199
543 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
545 Version 1.30.0 (2018-10-25)
546 ==========================
550 - [Procedural macros are now available.][52081] These kinds of macros allow for
551 more powerful code generation. There is a [new chapter available][proc-macros]
552 in the Rust Programming Language book that goes further in depth.
553 - [You can now use keywords as identifiers using the raw identifiers
554 syntax (`r#`),][53236] e.g. `let r#for = true;`
555 - [Using anonymous parameters in traits is now deprecated with a warning and
556 will be a hard error in the 2018 edition.][53272]
557 - [You can now use `crate` in paths.][54404] This allows you to refer to the
558 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
559 - [Using a external crate no longer requires being prefixed with `::`.][54404]
560 Previously, using a external crate in a module without a use statement
561 required `let json = ::serde_json::from_str(foo);` but can now be written
562 as `let json = serde_json::from_str(foo);`.
563 - [You can now apply the `#[used]` attribute to static items to prevent the
564 compiler from optimising them away, even if they appear to be unused,][51363]
565 e.g. `#[used] static FOO: u32 = 1;`
566 - [You can now import and reexport macros from other crates with the `use`
567 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
568 the root module of the crate. If your macro relies on calling other local
569 macros, it is recommended to export with the
570 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
572 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
573 using the `vis` specifier.][53370]
574 - [Non-macro attributes now allow all forms of literals, not just
575 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
576 write `#[attr(true)]`.
577 - [You can now specify a function to handle a panic in the Rust runtime with the
578 `#[panic_handler]` attribute.][51366]
582 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
583 - [Added the `aarch64-unknown-netbsd` target][53165]
587 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
591 - [`Ipv4Addr::BROADCAST`]
592 - [`Ipv4Addr::LOCALHOST`]
593 - [`Ipv4Addr::UNSPECIFIED`]
594 - [`Ipv6Addr::LOCALHOST`]
595 - [`Ipv6Addr::UNSPECIFIED`]
596 - [`Iterator::find_map`]
598 The following methods are replacement methods for `trim_left`, `trim_right`,
599 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
601 - [`str::trim_end_matches`]
603 - [`str::trim_start_matches`]
604 - [`str::trim_start`]
608 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
609 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
610 equivalent to calling `rustdoc --error-format=json`.
611 - [Cargo will now provide a progress bar for builds.][cargo/5995]
615 - [`rustdoc` allows you to specify what edition to treat your code as with the
616 `--edition` option.][54057]
617 - [`rustdoc` now has the `--color` (specify whether to output color) and
618 `--error-format` (specify error format, e.g. `json`) options.][53003]
619 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
620 debug symbols.][53774]
621 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
622 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
624 [50911]: https://github.com/rust-lang/rust/pull/50911/
625 [51363]: https://github.com/rust-lang/rust/pull/51363/
626 [51366]: https://github.com/rust-lang/rust/pull/51366/
627 [52081]: https://github.com/rust-lang/rust/pull/52081/
628 [53003]: https://github.com/rust-lang/rust/pull/53003/
629 [53033]: https://github.com/rust-lang/rust/pull/53033/
630 [53044]: https://github.com/rust-lang/rust/pull/53044/
631 [53165]: https://github.com/rust-lang/rust/pull/53165/
632 [53213]: https://github.com/rust-lang/rust/pull/53213/
633 [53236]: https://github.com/rust-lang/rust/pull/53236/
634 [53272]: https://github.com/rust-lang/rust/pull/53272/
635 [53370]: https://github.com/rust-lang/rust/pull/53370/
636 [53459]: https://github.com/rust-lang/rust/pull/53459/
637 [53774]: https://github.com/rust-lang/rust/pull/53774/
638 [53822]: https://github.com/rust-lang/rust/pull/53822/
639 [54057]: https://github.com/rust-lang/rust/pull/54057/
640 [54146]: https://github.com/rust-lang/rust/pull/54146/
641 [54404]: https://github.com/rust-lang/rust/pull/54404/
642 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
643 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
644 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
645 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
647 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
648 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
649 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
650 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
651 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
652 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
653 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
654 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
655 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
656 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
659 Version 1.29.2 (2018-10-11)
660 ===========================
662 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
663 - The `rls-preview` component on the windows-gnu targets has been restored.
665 [54639]: https://github.com/rust-lang/rust/pull/54639
668 Version 1.29.1 (2018-09-25)
669 ===========================
674 - The standard library's `str::repeat` function contained an out of bounds write
675 caused by an integer overflow. This has been fixed by deterministically
676 panicking when an overflow happens.
678 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
682 Version 1.29.0 (2018-09-13)
683 ==========================
687 - [Bumped minimum LLVM version to 5.0.][51899]
688 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
689 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
693 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
694 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
695 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
696 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
698 - [`Cell<T>` now allows `T` to be unsized.][50494]
699 - [`SocketAddr` is now stable on Redox.][52656]
704 - [`Iterator::flatten`]
709 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
710 `--locked` to disable this behavior.
711 - [`cargo-install` will now allow you to cross compile an install
712 using `--target`.][cargo/5614]
713 - [Added the `cargo-fix` subcommand to automatically move project code from
714 2015 edition to 2018.][cargo/5723]
715 - [`cargo doc` can now optionally document private types using the
716 `--document-private-items` flag.][cargo/5543]
720 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
721 the specified level to that level.][52354] For example `--cap-lints warn`
722 will demote `deny` and `forbid` lints to `warn`.
723 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
724 fails and `101` if there is a panic.][52197]
725 - [A preview of clippy has been made available through rustup.][51122]
726 You can install the preview with `rustup component add clippy-preview`.
730 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
731 Use `str::get_unchecked(begin..end)` instead.
732 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
733 Consider using the `home_dir` function from
734 https://crates.io/crates/dirs instead.
735 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
736 - [`cfg` attributes and `--cfg` command line flags are now more
737 strictly validated.][53893]
739 [53893]: https://github.com/rust-lang/rust/pull/53893/
740 [52861]: https://github.com/rust-lang/rust/pull/52861/
741 [52656]: https://github.com/rust-lang/rust/pull/52656/
742 [52239]: https://github.com/rust-lang/rust/pull/52239/
743 [52330]: https://github.com/rust-lang/rust/pull/52330/
744 [52354]: https://github.com/rust-lang/rust/pull/52354/
745 [52402]: https://github.com/rust-lang/rust/pull/52402/
746 [52103]: https://github.com/rust-lang/rust/pull/52103/
747 [52197]: https://github.com/rust-lang/rust/pull/52197/
748 [51807]: https://github.com/rust-lang/rust/pull/51807/
749 [51899]: https://github.com/rust-lang/rust/pull/51899/
750 [51912]: https://github.com/rust-lang/rust/pull/51912/
751 [51511]: https://github.com/rust-lang/rust/pull/51511/
752 [51619]: https://github.com/rust-lang/rust/pull/51619/
753 [51656]: https://github.com/rust-lang/rust/pull/51656/
754 [51178]: https://github.com/rust-lang/rust/pull/51178/
755 [51122]: https://github.com/rust-lang/rust/pull/51122
756 [50494]: https://github.com/rust-lang/rust/pull/50494/
757 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
758 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
759 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
760 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
761 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
762 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
763 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
766 Version 1.28.0 (2018-08-02)
767 ===========================
771 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
772 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
773 the inner type across Foreign Function Interface (FFI) boundaries.
774 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
775 and can now be used as identifiers.][51196]
776 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
777 stable.][51241] This will allow users to specify a global allocator for
779 - [Unit test functions marked with the `#[test]` attribute can now return
780 `Result<(), E: Debug>` in addition to `()`.][51298]
781 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
782 allows macros to easily target lifetimes.
786 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
787 prioritise making smaller binary sizes. `z` is the same as `s` with the
788 exception that it does not vectorise loops, which typically results in an even
790 - [The short error format is now stable.][49546] Specified with
791 `--error-format=short` this option will provide a more compressed output of
793 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
794 - [Reduced the number of allocations in the macro parser.][50855] This can
795 improve compile times of macro heavy crates on average by 5%.
799 - [Implemented `Default` for `&mut str`.][51306]
800 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
801 - [Implemented `Extend` for `()`.][50234]
802 - [The `Debug` implementation of `time::Duration` should now be more easily
803 human readable.][50364] Previously a `Duration` of one second would printed as
804 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
805 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
806 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
807 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
808 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
809 for `PathBuf`.][50170]
810 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
811 and `Wrapping<i128>`.][50465]
812 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
813 possible.][51050] This can provide up to a 40% speed increase.
814 - [Improved error messages when using `format!`.][50610]
818 - [`Iterator::step_by`]
819 - [`Path::ancestors`]
820 - [`SystemTime::UNIX_EPOCH`]
821 - [`alloc::GlobalAlloc`]
823 - [`alloc::LayoutErr`]
826 - [`alloc::alloc_zeroed`]
829 - [`alloc::handle_alloc_error`]
830 - [`btree_map::Entry::or_default`]
832 - [`hash_map::Entry::or_default`]
833 - [`iter::repeat_with`]
834 - [`num::NonZeroUsize`]
835 - [`num::NonZeroU128`]
836 - [`num::NonZeroU16`]
837 - [`num::NonZeroU32`]
838 - [`num::NonZeroU64`]
840 - [`ops::RangeBounds`]
841 - [`slice::SliceIndex`]
842 - [`slice::from_mut`]
843 - [`slice::from_ref`]
844 - [`{Any + Send + Sync}::downcast_mut`]
845 - [`{Any + Send + Sync}::downcast_ref`]
846 - [`{Any + Send + Sync}::is`]
850 - [Cargo will now no longer allow you to publish crates with build scripts that
851 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
852 considered to be immutable.
856 - [The `suggestion_applicability` field in `rustc`'s json output is now
857 stable.][50486] This will allow dev tools to check whether a code suggestion
862 - [Rust will consider trait objects with duplicated constraints to be the same
863 type as without the duplicated constraint.][51276] For example the below code will
869 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
872 impl Trait + Send + Send {
873 fn test(&self) { println!("two"); }
877 [49546]: https://github.com/rust-lang/rust/pull/49546/
878 [50143]: https://github.com/rust-lang/rust/pull/50143/
879 [50170]: https://github.com/rust-lang/rust/pull/50170/
880 [50234]: https://github.com/rust-lang/rust/pull/50234/
881 [50265]: https://github.com/rust-lang/rust/pull/50265/
882 [50364]: https://github.com/rust-lang/rust/pull/50364/
883 [50385]: https://github.com/rust-lang/rust/pull/50385/
884 [50465]: https://github.com/rust-lang/rust/pull/50465/
885 [50486]: https://github.com/rust-lang/rust/pull/50486/
886 [50554]: https://github.com/rust-lang/rust/pull/50554/
887 [50610]: https://github.com/rust-lang/rust/pull/50610/
888 [50855]: https://github.com/rust-lang/rust/pull/50855/
889 [51050]: https://github.com/rust-lang/rust/pull/51050/
890 [51196]: https://github.com/rust-lang/rust/pull/51196/
891 [51200]: https://github.com/rust-lang/rust/pull/51200/
892 [51241]: https://github.com/rust-lang/rust/pull/51241/
893 [51276]: https://github.com/rust-lang/rust/pull/51276/
894 [51298]: https://github.com/rust-lang/rust/pull/51298/
895 [51306]: https://github.com/rust-lang/rust/pull/51306/
896 [51562]: https://github.com/rust-lang/rust/pull/51562/
897 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
898 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
899 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
900 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
901 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
902 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
903 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
904 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
905 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
906 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
907 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
908 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
909 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
910 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
911 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
912 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
913 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
914 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
915 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
916 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
917 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
918 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
919 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
920 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
921 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
922 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
923 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
924 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
925 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
926 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
928 Version 1.27.2 (2018-07-20)
929 ===========================
934 - The borrow checker was fixed to avoid potential unsoundness when using
935 match ergonomics: [#52213][52213].
937 [52213]: https://github.com/rust-lang/rust/issues/52213
939 Version 1.27.1 (2018-07-10)
940 ===========================
945 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
946 when running, which enabled executing code as some other user on a
947 given machine. This release fixes that vulnerability; you can read
948 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
950 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
955 - The borrow checker was fixed to avoid an additional potential unsoundness when using
956 match ergonomics: [#51415][51415], [#49534][49534].
958 [51415]: https://github.com/rust-lang/rust/issues/51415
959 [49534]: https://github.com/rust-lang/rust/issues/49534
960 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
961 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
963 Version 1.27.0 (2018-06-21)
964 ==========================
968 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
969 be used as an identifier.
970 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
971 bare `Trait` syntax, and should make it clearer when being used in tandem with
972 `impl Trait` because it is equivalent to the following syntax:
973 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
974 `Box<Trait> == Box<dyn Trait>`.
975 - [Attributes on generic parameters such as types and lifetimes are
976 now stable.][48851] e.g.
977 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
978 - [The `#[must_use]` attribute can now also be used on functions as well as
979 types.][48925] It provides a lint that by default warns users when the
980 value returned by a function has not been used.
984 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
988 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
989 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
990 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
991 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
993 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
994 std are now available in core.][49896]
995 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
997 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
998 that the operation isn't done in place.
999 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
1000 the `#[must_use]` attribute][49533] to warn about unused potentially
1001 expensive allocations.
1005 - [`DoubleEndedIterator::rfind`]
1006 - [`DoubleEndedIterator::rfold`]
1007 - [`DoubleEndedIterator::try_rfold`]
1008 - [`Duration::from_micros`]
1009 - [`Duration::from_nanos`]
1010 - [`Duration::subsec_micros`]
1011 - [`Duration::subsec_millis`]
1012 - [`HashMap::remove_entry`]
1013 - [`Iterator::try_fold`]
1014 - [`Iterator::try_for_each`]
1016 - [`Option::filter`]
1017 - [`String::replace_range`]
1018 - [`Take::set_limit`]
1019 - [`hint::unreachable_unchecked`]
1020 - [`os::unix::process::parent_id`]
1021 - [`ptr::swap_nonoverlapping`]
1022 - [`slice::rsplit_mut`]
1024 - [`slice::swap_with_slice`]
1028 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
1029 `readme`, and `repository` fields.][cargo/5386]
1030 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
1031 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
1032 a different directory than `target` for placing compilation artifacts.
1033 - [Cargo will be adding automatic target inference for binaries, benchmarks,
1034 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
1035 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
1036 where cargo would infer a binary, Cargo will produce a warning. You can
1037 disable this feature ahead of time by setting any of the following to false:
1038 `autobins`, `autobenches`, `autoexamples`, `autotests`.
1039 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
1040 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
1044 - [Added “The Rustc book” into the official documentation.][49707]
1045 [“The Rustc book”] documents and teaches how to use the rustc compiler.
1046 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
1050 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
1051 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
1052 compile, `"".is_empty()` will still compile.
1053 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
1054 will only print the inner type.][48553] E.g.
1055 `print!("{:?}", AtomicBool::new(true))` will print `true`,
1056 not `AtomicBool(true)`.
1057 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
1058 could enter higher numbers but they were not supported by LLVM. Up to 512MB
1059 alignment should cover all use cases.
1060 - The `.description()` method on the `std::error::Error` trait
1061 [has been soft-deprecated][50163]. It is no longer required to implement it.
1063 [48553]: https://github.com/rust-lang/rust/pull/48553/
1064 [48851]: https://github.com/rust-lang/rust/pull/48851/
1065 [48925]: https://github.com/rust-lang/rust/pull/48925/
1066 [49533]: https://github.com/rust-lang/rust/pull/49533/
1067 [49623]: https://github.com/rust-lang/rust/pull/49623/
1068 [49630]: https://github.com/rust-lang/rust/pull/49630/
1069 [49664]: https://github.com/rust-lang/rust/pull/49664/
1070 [49699]: https://github.com/rust-lang/rust/pull/49699/
1071 [49707]: https://github.com/rust-lang/rust/pull/49707/
1072 [49719]: https://github.com/rust-lang/rust/pull/49719/
1073 [49896]: https://github.com/rust-lang/rust/pull/49896/
1074 [49968]: https://github.com/rust-lang/rust/pull/49968/
1075 [50163]: https://github.com/rust-lang/rust/pull/50163
1076 [50177]: https://github.com/rust-lang/rust/pull/50177/
1077 [50378]: https://github.com/rust-lang/rust/pull/50378/
1078 [50398]: https://github.com/rust-lang/rust/pull/50398/
1079 [50423]: https://github.com/rust-lang/rust/pull/50423/
1080 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
1081 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
1082 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
1083 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
1084 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
1085 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
1086 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
1087 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
1088 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
1089 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
1090 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
1091 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1092 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1093 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
1094 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
1095 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
1096 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
1097 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
1098 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
1099 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
1100 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
1101 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
1102 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1103 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
1104 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
1105 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
1106 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
1107 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
1108 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
1109 [“The Rustc book”]: https://doc.rust-lang.org/rustc
1112 Version 1.26.2 (2018-06-05)
1113 ==========================
1118 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
1120 [51117]: https://github.com/rust-lang/rust/issues/51117
1123 Version 1.26.1 (2018-05-29)
1124 ==========================
1129 - [RLS now works on Windows.][50646]
1130 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
1136 - [`fn main() -> impl Trait` no longer works for non-Termination
1138 This reverts an accidental stabilization.
1139 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
1140 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
1142 [50646]: https://github.com/rust-lang/rust/issues/50646
1143 [50656]: https://github.com/rust-lang/rust/pull/50656
1144 [50812]: https://github.com/rust-lang/rust/pull/50812
1145 [50950]: https://github.com/rust-lang/rust/issues/50950
1146 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
1148 Version 1.26.0 (2018-05-10)
1149 ==========================
1153 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1154 implement either or both traits.][49299]
1155 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1156 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1157 lifetime can be elided.][49458]
1158 - [`impl Trait` is now stable allowing you to have abstract types in returns
1159 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1160 `fn open(path: impl AsRef<Path>)`.
1161 - [Pattern matching will now automatically apply dereferences.][49394]
1162 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1163 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1164 - [A lot of operations are now available in a const context.][46882] E.g. You
1165 can now index into constant arrays, reference and dereference into constants,
1166 and use tuple struct constructors.
1167 - [Fixed entry slice patterns are now stable.][48516] E.g.
1169 let points = [1, 2, 3, 4];
1171 [1, 2, 3, 4] => println!("All points were sequential."),
1172 _ => println!("Not all points were sequential."),
1179 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1180 - [Fixed exponential projection complexity on nested types.][48296]
1181 This can provide up to a ~12% reduction in compile times for certain crates.
1182 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1183 to remap path prefixes outputted by the compiler.
1184 - [Added `powerpc-unknown-netbsd` target.][48281]
1188 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1189 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1190 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1191 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1192 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1193 - [`ascii::escape_default` is now available in libcore.][48735]
1194 - [Trailing commas are now supported in std and core macros.][48056]
1195 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1196 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1201 - [`*const T::copy_to_nonoverlapping`]
1202 - [`*const T::copy_to`]
1203 - [`*const T::read_unaligned`]
1204 - [`*const T::read_volatile`]
1205 - [`*const T::read`]
1207 - [`*const T::wrapping_add`]
1208 - [`*const T::wrapping_sub`]
1210 - [`*mut T::copy_to_nonoverlapping`]
1211 - [`*mut T::copy_to`]
1212 - [`*mut T::read_unaligned`]
1213 - [`*mut T::read_volatile`]
1215 - [`*mut T::replace`]
1218 - [`*mut T::wrapping_add`]
1219 - [`*mut T::wrapping_sub`]
1220 - [`*mut T::write_bytes`]
1221 - [`*mut T::write_unaligned`]
1222 - [`*mut T::write_volatile`]
1225 - [`FromUtf8Error::as_bytes`]
1226 - [`LocalKey::try_with`]
1227 - [`Option::cloned`]
1228 - [`btree_map::Entry::and_modify`]
1229 - [`fs::read_to_string`]
1232 - [`hash_map::Entry::and_modify`]
1233 - [`iter::FusedIterator`]
1234 - [`ops::RangeInclusive`]
1235 - [`ops::RangeToInclusive`]
1237 - [`slice::rotate_left`]
1238 - [`slice::rotate_right`]
1239 - [`String::retain`]
1244 - [Cargo will now output path to custom commands when `-v` is
1245 passed with `--list`][cargo/5041]
1246 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1250 - [The second edition of "The Rust Programming Language" book is now recommended
1251 over the first.][48404]
1256 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1257 syntax is now invalid.
1259 use std::ops::Fn as dyn;
1260 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1262 - [The result of dereferences are no longer promoted to `'static`.][47408]
1266 const PAIR: &(i32, i32) = &(0, 1);
1267 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1270 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1271 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1273 - [Removed hoedown from rustdoc.][48274]
1274 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1276 [46882]: https://github.com/rust-lang/rust/pull/46882
1277 [47379]: https://github.com/rust-lang/rust/pull/47379
1278 [47408]: https://github.com/rust-lang/rust/pull/47408
1279 [47813]: https://github.com/rust-lang/rust/pull/47813
1280 [48056]: https://github.com/rust-lang/rust/pull/48056
1281 [48125]: https://github.com/rust-lang/rust/pull/48125
1282 [48166]: https://github.com/rust-lang/rust/pull/48166
1283 [48235]: https://github.com/rust-lang/rust/pull/48235
1284 [48274]: https://github.com/rust-lang/rust/pull/48274
1285 [48281]: https://github.com/rust-lang/rust/pull/48281
1286 [48296]: https://github.com/rust-lang/rust/pull/48296
1287 [48326]: https://github.com/rust-lang/rust/pull/48326
1288 [48359]: https://github.com/rust-lang/rust/pull/48359
1289 [48404]: https://github.com/rust-lang/rust/pull/48404
1290 [48481]: https://github.com/rust-lang/rust/pull/48481
1291 [48516]: https://github.com/rust-lang/rust/pull/48516
1292 [48628]: https://github.com/rust-lang/rust/pull/48628
1293 [48629]: https://github.com/rust-lang/rust/pull/48629
1294 [48657]: https://github.com/rust-lang/rust/pull/48657
1295 [48735]: https://github.com/rust-lang/rust/pull/48735
1296 [48978]: https://github.com/rust-lang/rust/pull/48978
1297 [49101]: https://github.com/rust-lang/rust/pull/49101
1298 [49109]: https://github.com/rust-lang/rust/pull/49109
1299 [49121]: https://github.com/rust-lang/rust/pull/49121
1300 [49162]: https://github.com/rust-lang/rust/pull/49162
1301 [49184]: https://github.com/rust-lang/rust/pull/49184
1302 [49234]: https://github.com/rust-lang/rust/pull/49234
1303 [49255]: https://github.com/rust-lang/rust/pull/49255
1304 [49299]: https://github.com/rust-lang/rust/pull/49299
1305 [49305]: https://github.com/rust-lang/rust/pull/49305
1306 [49394]: https://github.com/rust-lang/rust/pull/49394
1307 [49458]: https://github.com/rust-lang/rust/pull/49458
1308 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1309 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1310 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1311 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1312 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1313 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1314 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1315 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1316 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1317 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1318 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1319 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1320 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1321 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1322 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1323 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1324 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1325 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1326 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1327 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1328 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1329 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1330 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1331 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1332 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1333 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1334 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1335 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1336 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1337 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1338 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1339 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1340 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1341 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1342 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1343 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1344 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1345 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1346 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1347 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1348 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1349 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1352 Version 1.25.0 (2018-03-29)
1353 ==========================
1357 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1358 - [You can now use nested groups of imports.][47948]
1359 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1360 - [You can now have `|` at the start of a match arm.][47947] e.g.
1362 enum Foo { A, B, C }
1368 | Foo::B => println!("AB"),
1369 | Foo::C => println!("C"),
1376 - [Upgraded to LLVM 6.][47828]
1377 - [Added `-C lto=val` option.][47521]
1378 - [Added `i586-unknown-linux-musl` target][47282]
1382 - [Impl Send for `process::Command` on Unix.][47760]
1383 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1384 - [`UnsafeCell::into_inner` is now safe.][47204]
1385 - [Implement libstd for CloudABI.][47268]
1386 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1387 - [Implement `AsRef<Path>` for Component][46985]
1388 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1389 - [Moved `Duration` to libcore.][46666]
1393 - [`Location::column`]
1396 The following functions can now be used in a constant expression.
1397 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1398 - [`Duration::new`][47300]
1399 - [`Duration::from_secs`][47300]
1400 - [`Duration::from_millis`][47300]
1404 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1405 - [`cargo new` now defaults to creating a binary crate, instead of a
1406 library crate.][cargo/5029]
1410 - [Rust by example is now shipped with new releases][46196]
1414 - [Deprecated `net::lookup_host`.][47510]
1415 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1416 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1417 around indexing operations (see [#47349][47349]). This has been fixed (which also
1418 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1419 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1421 [33903]: https://github.com/rust-lang/rust/pull/33903
1422 [47947]: https://github.com/rust-lang/rust/pull/47947
1423 [47948]: https://github.com/rust-lang/rust/pull/47948
1424 [47760]: https://github.com/rust-lang/rust/pull/47760
1425 [47790]: https://github.com/rust-lang/rust/pull/47790
1426 [47828]: https://github.com/rust-lang/rust/pull/47828
1427 [47398]: https://github.com/rust-lang/rust/pull/47398
1428 [47510]: https://github.com/rust-lang/rust/pull/47510
1429 [47521]: https://github.com/rust-lang/rust/pull/47521
1430 [47204]: https://github.com/rust-lang/rust/pull/47204
1431 [47251]: https://github.com/rust-lang/rust/pull/47251
1432 [47268]: https://github.com/rust-lang/rust/pull/47268
1433 [47282]: https://github.com/rust-lang/rust/pull/47282
1434 [47300]: https://github.com/rust-lang/rust/pull/47300
1435 [47349]: https://github.com/rust-lang/rust/pull/47349
1436 [46931]: https://github.com/rust-lang/rust/pull/46931
1437 [46985]: https://github.com/rust-lang/rust/pull/46985
1438 [47006]: https://github.com/rust-lang/rust/pull/47006
1439 [46830]: https://github.com/rust-lang/rust/pull/46830
1440 [46095]: https://github.com/rust-lang/rust/pull/46095
1441 [46666]: https://github.com/rust-lang/rust/pull/46666
1442 [46196]: https://github.com/rust-lang/rust/pull/46196
1443 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1444 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1445 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1446 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1447 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1450 Version 1.24.1 (2018-03-01)
1451 ==========================
1453 - [Do not abort when unwinding through FFI][48251]
1454 - [Emit UTF-16 files for linker arguments on Windows][48318]
1455 - [Make the error index generator work again][48308]
1456 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1458 [48251]: https://github.com/rust-lang/rust/issues/48251
1459 [48308]: https://github.com/rust-lang/rust/issues/48308
1460 [48318]: https://github.com/rust-lang/rust/issues/48318
1461 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1464 Version 1.24.0 (2018-02-15)
1465 ==========================
1469 - [External `sysv64` ffi is now available.][46528]
1470 eg. `extern "sysv64" fn foo () {}`
1474 - [rustc now uses 16 codegen units by default for release builds.][46910]
1475 For the fastest builds, utilize `codegen-units=1`.
1476 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1477 - [Add `aarch64-unknown-openbsd` support][46760]
1481 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1482 improvement in performance in the majority of cases.
1483 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1484 with Windows.][46798]
1485 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1486 - [impl `From<bool>` for `AtomicBool`][46293]
1487 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1488 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1489 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1490 - [float::from_bits now just uses transmute.][46012] This provides
1491 some optimisations from LLVM.
1492 - [Copied `AsciiExt` methods onto `char`][46077]
1493 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1494 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1495 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1496 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1500 - [`RefCell::replace`]
1502 - [`atomic::spin_loop_hint`]
1504 The following functions can now be used in a constant expression.
1505 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1507 - [`AtomicBool::new`][46287]
1508 - [`AtomicUsize::new`][46287]
1509 - [`AtomicIsize::new`][46287]
1510 - [`AtomicPtr::new`][46287]
1511 - [`Cell::new`][46287]
1512 - [`{integer}::min_value`][46287]
1513 - [`{integer}::max_value`][46287]
1514 - [`mem::size_of`][46287]
1515 - [`mem::align_of`][46287]
1516 - [`ptr::null`][46287]
1517 - [`ptr::null_mut`][46287]
1518 - [`RefCell::new`][46287]
1519 - [`UnsafeCell::new`][46287]
1523 - [Added a `workspace.default-members` config that
1524 overrides implied `--all` in virtual workspaces.][cargo/4743]
1525 - [Enable incremental by default on development builds.][cargo/4817] Also added
1526 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1527 per-project or global basis respectively.
1534 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1535 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1536 in accordance with IETF RFC 4291 §2.2.
1537 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1538 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1539 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1540 - [Leading zeros in tuple struct members is now an error][47084]
1541 - [`column!()` macro is one-based instead of zero-based][46977]
1542 - [`fmt::Arguments` can no longer be shared across threads][45198]
1543 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1544 - [Cargo sets a different working directory for the compiler][cargo/4788]
1546 [44884]: https://github.com/rust-lang/rust/pull/44884
1547 [45198]: https://github.com/rust-lang/rust/pull/45198
1548 [45506]: https://github.com/rust-lang/rust/pull/45506
1549 [45904]: https://github.com/rust-lang/rust/pull/45904
1550 [45990]: https://github.com/rust-lang/rust/pull/45990
1551 [46012]: https://github.com/rust-lang/rust/pull/46012
1552 [46077]: https://github.com/rust-lang/rust/pull/46077
1553 [46094]: https://github.com/rust-lang/rust/pull/46094
1554 [46284]: https://github.com/rust-lang/rust/pull/46284
1555 [46287]: https://github.com/rust-lang/rust/pull/46287
1556 [46293]: https://github.com/rust-lang/rust/pull/46293
1557 [46528]: https://github.com/rust-lang/rust/pull/46528
1558 [46671]: https://github.com/rust-lang/rust/pull/46671
1559 [46713]: https://github.com/rust-lang/rust/pull/46713
1560 [46735]: https://github.com/rust-lang/rust/pull/46735
1561 [46749]: https://github.com/rust-lang/rust/pull/46749
1562 [46760]: https://github.com/rust-lang/rust/pull/46760
1563 [46798]: https://github.com/rust-lang/rust/pull/46798
1564 [46828]: https://github.com/rust-lang/rust/pull/46828
1565 [46831]: https://github.com/rust-lang/rust/pull/46831
1566 [46833]: https://github.com/rust-lang/rust/pull/46833
1567 [46910]: https://github.com/rust-lang/rust/pull/46910
1568 [46977]: https://github.com/rust-lang/rust/pull/46977
1569 [47018]: https://github.com/rust-lang/rust/pull/47018
1570 [47080]: https://github.com/rust-lang/rust/pull/47080
1571 [47084]: https://github.com/rust-lang/rust/pull/47084
1572 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1573 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1574 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1575 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1576 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1577 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1580 Version 1.23.0 (2018-01-04)
1581 ==========================
1585 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1586 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1587 Which should fix some confusing errors in some operations.
1591 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1592 undefined behavior.][45920]
1593 - [rustc now suggests renaming import if names clash.][45660]
1594 - [Display errors/warnings correctly when there are zero-width or
1595 wide characters.][45711]
1596 - [rustc now avoids unnecessary copies of arguments that are
1597 simple bindings][45380] This should improve memory usage on average by 5-10%.
1598 - [Updated musl used to build musl rustc to 1.1.17][45393]
1602 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1603 - [Implement Hash for raw pointers to unsized types][45483]
1604 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1605 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1606 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1607 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1608 and `<*mut T>::as_mut`][44932]
1609 - [Optimized `Thread::{park, unpark}` implementation][45524]
1610 - [Improved `SliceExt::binary_search` performance.][45333]
1611 - [impl `FromIterator<()>` for `()`][45379]
1612 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1620 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1621 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1622 - [Added unit test checking to `cargo check`][cargo/4592]
1623 - [Cargo now lets you install a specific version
1624 using `cargo install --version`][cargo/4637]
1628 - [Releases now ship with the Cargo book documentation.][45692]
1629 - [rustdoc now prints rendering warnings on every run.][45324]
1633 - [Changes have been made to type equality to make it more correct,
1634 in rare cases this could break some code.][45853] [Tracking issue for
1635 further information][45852]
1636 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1637 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1638 Android 9, the minimum supported version is Android 14.
1639 - [Bumped the minimum LLVM to 3.9][45326]
1641 [44042]: https://github.com/rust-lang/rust/pull/44042
1642 [44932]: https://github.com/rust-lang/rust/pull/44932
1643 [45267]: https://github.com/rust-lang/rust/pull/45267
1644 [45324]: https://github.com/rust-lang/rust/pull/45324
1645 [45326]: https://github.com/rust-lang/rust/pull/45326
1646 [45333]: https://github.com/rust-lang/rust/pull/45333
1647 [45379]: https://github.com/rust-lang/rust/pull/45379
1648 [45380]: https://github.com/rust-lang/rust/pull/45380
1649 [45393]: https://github.com/rust-lang/rust/pull/45393
1650 [45435]: https://github.com/rust-lang/rust/pull/45435
1651 [45483]: https://github.com/rust-lang/rust/pull/45483
1652 [45524]: https://github.com/rust-lang/rust/pull/45524
1653 [45571]: https://github.com/rust-lang/rust/pull/45571
1654 [45580]: https://github.com/rust-lang/rust/pull/45580
1655 [45610]: https://github.com/rust-lang/rust/pull/45610
1656 [45660]: https://github.com/rust-lang/rust/pull/45660
1657 [45692]: https://github.com/rust-lang/rust/pull/45692
1658 [45711]: https://github.com/rust-lang/rust/pull/45711
1659 [45772]: https://github.com/rust-lang/rust/pull/45772
1660 [45852]: https://github.com/rust-lang/rust/issues/45852
1661 [45853]: https://github.com/rust-lang/rust/pull/45853
1662 [45887]: https://github.com/rust-lang/rust/pull/45887
1663 [45920]: https://github.com/rust-lang/rust/pull/45920
1664 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1665 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1666 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1669 Version 1.22.1 (2017-11-22)
1670 ==========================
1672 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1674 [46183]: https://github.com/rust-lang/rust/pull/46183
1676 Version 1.22.0 (2017-11-22)
1677 ==========================
1681 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1682 - [Now accepts underscores in unicode escapes][43716]
1683 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1684 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1688 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1689 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1690 This should decrease compile times for debug builds.
1691 - [strict memory alignment now enabled on ARMv6][45094]
1692 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1696 - [Allow atomic operations up to 32 bits
1697 on `armv5te_unknown_linux_gnueabi`][44978]
1698 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1699 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1700 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1701 - [Properly detect overflow in `Instant += Duration`.][44220]
1702 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1703 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1704 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1711 - [Cargo will now build multi file examples in subdirectories of the `examples`
1712 folder that have a `main.rs` file.][cargo/4496]
1713 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1714 the old format will continue to work and can be updated with `cargo update`.
1715 - [Now supports vendoring git repositories][cargo/3992]
1719 - [`libbacktrace` is now available on Apple platforms.][44251]
1720 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1721 This now lets you specify that a given code example will fail to compile.
1725 - [The minimum Android version that rustc can build for has been bumped
1726 to `4.0` from `2.3`][45656]
1727 - [Allowing `T op= &T` for numeric types has broken some type
1728 inference cases][45480]
1731 [42526]: https://github.com/rust-lang/rust/pull/42526
1732 [43017]: https://github.com/rust-lang/rust/pull/43017
1733 [43716]: https://github.com/rust-lang/rust/pull/43716
1734 [43949]: https://github.com/rust-lang/rust/pull/43949
1735 [44015]: https://github.com/rust-lang/rust/pull/44015
1736 [44220]: https://github.com/rust-lang/rust/pull/44220
1737 [44251]: https://github.com/rust-lang/rust/pull/44251
1738 [44287]: https://github.com/rust-lang/rust/pull/44287
1739 [44303]: https://github.com/rust-lang/rust/pull/44303
1740 [44456]: https://github.com/rust-lang/rust/pull/44456
1741 [44466]: https://github.com/rust-lang/rust/pull/44466
1742 [44895]: https://github.com/rust-lang/rust/pull/44895
1743 [44966]: https://github.com/rust-lang/rust/pull/44966
1744 [44978]: https://github.com/rust-lang/rust/pull/44978
1745 [45041]: https://github.com/rust-lang/rust/pull/45041
1746 [45064]: https://github.com/rust-lang/rust/pull/45064
1747 [45075]: https://github.com/rust-lang/rust/pull/45075
1748 [45094]: https://github.com/rust-lang/rust/pull/45094
1749 [45095]: https://github.com/rust-lang/rust/pull/45095
1750 [45480]: https://github.com/rust-lang/rust/issues/45480
1751 [45656]: https://github.com/rust-lang/rust/pull/45656
1752 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1753 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1754 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1761 Version 1.21.0 (2017-10-12)
1762 ==========================
1766 - [You can now use static references for literals.][43838]
1770 let x: &'static u32 = &0;
1773 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1776 my_macro!(Vec<i32>::new); // Always worked
1777 my_macro!(Vec::<i32>::new); // Now works
1782 - [Upgraded jemalloc to 4.5.0][43911]
1783 - [Enabled unwinding panics on Redox][43917]
1784 - [Now runs LLVM in parallel during translation phase.][43506]
1785 This should reduce peak memory usage.
1789 - [Generate builtin impls for `Clone` for all arrays and tuples that
1790 are `T: Clone`][43690]
1791 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1792 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1793 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1798 [`std::mem::discriminant`]
1802 - [You can now call `cargo install` with multiple package names][cargo/4216]
1803 - [Cargo commands inside a virtual workspace will now implicitly
1804 pass `--all`][cargo/4335]
1805 - [Added a `[patch]` section to `Cargo.toml` to handle
1806 prepublication dependencies][cargo/4123] [RFC 1969]
1807 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1808 like patterns][cargo/4270]
1809 - [Added the `--all-targets` option][cargo/4400]
1810 - [Using required dependencies as a feature is now deprecated and emits
1811 a warning][cargo/4364]
1816 - [Cargo docs are moving][43916]
1817 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1818 - [The rustdoc book is now available][43863]
1819 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1820 - [Added a preview of RLS has been made available through rustup][44204]
1821 Install with `rustup component add rls-preview`
1822 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1823 Previously only showed `std::os::unix`.
1827 - [Changes in method matching against higher-ranked types][43880] This may cause
1828 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1829 - [rustc's JSON error output's byte position start at top of file.][42973]
1830 Was previously relative to the rustc's internal `CodeMap` struct which
1831 required the unstable library `libsyntax` to correctly use.
1832 - [`unused_results` lint no longer ignores booleans][43728]
1834 [42565]: https://github.com/rust-lang/rust/pull/42565
1835 [42973]: https://github.com/rust-lang/rust/pull/42973
1836 [43348]: https://github.com/rust-lang/rust/pull/43348
1837 [43459]: https://github.com/rust-lang/rust/pull/43459
1838 [43506]: https://github.com/rust-lang/rust/pull/43506
1839 [43540]: https://github.com/rust-lang/rust/pull/43540
1840 [43690]: https://github.com/rust-lang/rust/pull/43690
1841 [43728]: https://github.com/rust-lang/rust/pull/43728
1842 [43838]: https://github.com/rust-lang/rust/pull/43838
1843 [43863]: https://github.com/rust-lang/rust/pull/43863
1844 [43880]: https://github.com/rust-lang/rust/pull/43880
1845 [43911]: https://github.com/rust-lang/rust/pull/43911
1846 [43916]: https://github.com/rust-lang/rust/pull/43916
1847 [43917]: https://github.com/rust-lang/rust/pull/43917
1848 [44204]: https://github.com/rust-lang/rust/pull/44204
1849 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1850 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1851 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1852 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1853 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1854 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1855 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1856 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1857 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1859 Version 1.20.0 (2017-08-31)
1860 ===========================
1864 - [Associated constants are now stabilised.][42809]
1865 - [A lot of macro bugs are now fixed.][42913]
1870 - [Struct fields are now properly coerced to the expected field type.][42807]
1871 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1872 `wasm32-experimental-emscripten` target.
1873 - [Changed some of the error messages to be more helpful.][42033]
1874 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1876 - [rustc now reports the total number of errors on compilation failure][43015]
1877 previously this was only the number of errors in the pass that failed.
1878 - [Expansion in rustc has been sped up 29x.][42533]
1879 - [added `msp430-none-elf` target.][43099]
1880 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1882 - [Fixes backtraces on Redox][43228]
1883 - [rustc now identifies different versions of same crate when absolute paths of
1884 different types match in an error message.][42826]
1890 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1891 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1893 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1894 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1895 - [Impl `Clone` for `DefaultHasher`.][42799]
1896 - [Impl `Sync` for `SyncSender`.][42397]
1897 - [Impl `FromStr` for `char`][42271]
1898 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1900 - [allow messages in the `unimplemented!()` macro.][42155]
1901 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1902 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1903 - [Upgrade to Unicode 10.0.0][42999]
1904 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1905 - [Skip the main thread's manual stack guard on Linux][43072]
1906 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1907 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1909 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1914 - [`CStr::into_c_string`]
1915 - [`CString::as_c_str`]
1916 - [`CString::into_boxed_c_str`]
1917 - [`Chain::get_mut`]
1918 - [`Chain::get_ref`]
1919 - [`Chain::into_inner`]
1920 - [`Option::get_or_insert_with`]
1921 - [`Option::get_or_insert`]
1922 - [`OsStr::into_os_string`]
1923 - [`OsString::into_boxed_os_str`]
1926 - [`Utf8Error::error_len`]
1927 - [`char::EscapeDebug`]
1928 - [`char::escape_debug`]
1929 - [`compile_error!`]
1930 - [`f32::from_bits`]
1932 - [`f64::from_bits`]
1934 - [`mem::ManuallyDrop`]
1935 - [`slice::sort_unstable_by_key`]
1936 - [`slice::sort_unstable_by`]
1937 - [`slice::sort_unstable`]
1938 - [`str::from_boxed_utf8_unchecked`]
1939 - [`str::as_bytes_mut`]
1940 - [`str::as_bytes_mut`]
1941 - [`str::from_utf8_mut`]
1942 - [`str::from_utf8_unchecked_mut`]
1944 - [`str::get_unchecked_mut`]
1945 - [`str::get_unchecked`]
1947 - [`str::into_boxed_bytes`]
1952 - [Cargo API token location moved from `~/.cargo/config` to
1953 `~/.cargo/credentials`.][cargo/3978]
1954 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1955 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1956 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1957 - [You can now specify version of a binary when installed through
1958 `cargo install` using `--vers`.][cargo/4229]
1959 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1960 failure.][cargo/4248]
1961 - [Changed the convention around which file is the crate root.][cargo/4259]
1962 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1963 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1968 - [Functions with `'static` in their return types will now not be as usable as
1969 if they were using lifetime parameters instead.][42417]
1970 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1971 takes the sign of NaN into account where previously didn't.][42430]
1973 [42033]: https://github.com/rust-lang/rust/pull/42033
1974 [42155]: https://github.com/rust-lang/rust/pull/42155
1975 [42271]: https://github.com/rust-lang/rust/pull/42271
1976 [42397]: https://github.com/rust-lang/rust/pull/42397
1977 [42417]: https://github.com/rust-lang/rust/pull/42417
1978 [42430]: https://github.com/rust-lang/rust/pull/42430
1979 [42431]: https://github.com/rust-lang/rust/pull/42431
1980 [42533]: https://github.com/rust-lang/rust/pull/42533
1981 [42571]: https://github.com/rust-lang/rust/pull/42571
1982 [42613]: https://github.com/rust-lang/rust/pull/42613
1983 [42799]: https://github.com/rust-lang/rust/pull/42799
1984 [42807]: https://github.com/rust-lang/rust/pull/42807
1985 [42809]: https://github.com/rust-lang/rust/pull/42809
1986 [42822]: https://github.com/rust-lang/rust/pull/42822
1987 [42826]: https://github.com/rust-lang/rust/pull/42826
1988 [42854]: https://github.com/rust-lang/rust/pull/42854
1989 [42913]: https://github.com/rust-lang/rust/pull/42913
1990 [42999]: https://github.com/rust-lang/rust/pull/42999
1991 [43011]: https://github.com/rust-lang/rust/pull/43011
1992 [43015]: https://github.com/rust-lang/rust/pull/43015
1993 [43072]: https://github.com/rust-lang/rust/pull/43072
1994 [43077]: https://github.com/rust-lang/rust/pull/43077
1995 [43097]: https://github.com/rust-lang/rust/pull/43097
1996 [43099]: https://github.com/rust-lang/rust/pull/43099
1997 [43170]: https://github.com/rust-lang/rust/pull/43170
1998 [43178]: https://github.com/rust-lang/rust/pull/43178
1999 [43185]: https://github.com/rust-lang/rust/pull/43185
2000 [43228]: https://github.com/rust-lang/rust/pull/43228
2001 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
2002 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
2003 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
2004 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
2005 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
2006 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2007 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
2008 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
2009 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
2010 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
2011 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
2012 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
2013 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
2014 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
2015 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
2016 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
2017 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
2018 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
2019 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
2020 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
2021 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
2022 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
2023 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2024 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
2025 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
2026 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
2027 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
2028 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
2029 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
2030 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
2031 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
2032 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
2033 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
2034 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
2035 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
2036 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
2037 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
2038 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
2039 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
2042 Version 1.19.0 (2017-07-20)
2043 ===========================
2048 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
2049 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
2050 - [Macro recursion limit increased to 1024 from 64.][41676]
2051 - [Added lint for detecting unused macros.][41907]
2052 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
2053 For example: `let x = loop { break 7; };`
2054 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
2055 contain `Copy` types and cannot have a `Drop` implementation.
2056 Example: `union Foo { bar: u8, baz: usize }`
2057 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
2058 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
2063 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
2064 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
2065 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
2066 you should use `--target armv7-linux-androideabi`.
2067 - [Fixed ICE when removing a source file between compilation sessions.][41873]
2068 - [Minor optimisation of string operations.][42037]
2069 - [Compiler error message is now `aborting due to previous error(s)` instead of
2070 `aborting due to N previous errors`][42150] This was previously inaccurate and
2071 would only count certain kinds of errors.
2072 - [The compiler now supports Visual Studio 2017][42225]
2073 - [The compiler is now built against LLVM 4.0.1 by default][42948]
2074 - [Added a lot][42264] of [new error codes][42302]
2075 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
2076 libraries with C Run-time Libraries(CRT) to be statically linked.
2077 - [Fixed various ARM codegen bugs][42740]
2082 - [`String` now implements `FromIterator<Cow<'a, str>>` and
2083 `Extend<Cow<'a, str>>`][41449]
2084 - [`Vec` now implements `From<&mut [T]>`][41530]
2085 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
2086 - [`SplitWhitespace` now implements `Clone`][41659]
2087 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
2089 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
2090 macros, but for printing to stderr.
2095 - [`OsString::shrink_to_fit`]
2098 - [`thread::ThreadId`]
2103 - [Build scripts can now add environment variables to the environment
2104 the crate is being compiled in.
2105 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
2106 - [Subcommands now replace the current process rather than spawning a new
2107 child process][cargo/3970]
2108 - [Workspace members can now accept glob file patterns][cargo/3979]
2109 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
2110 the members in a given workspace.][cargo/3988]
2111 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
2112 - [Target directory path is now in the cargo metadata][cargo/4022]
2113 - [Cargo no longer checks out a local working directory for the
2114 crates.io index][cargo/4026] This should provide smaller file size for the
2115 registry, and improve cloning times, especially on Windows machines.
2116 - [Added an `--exclude` option for excluding certain packages when using the
2117 `--all` option][cargo/4031]
2118 - [Cargo will now automatically retry when receiving a 5xx error
2119 from crates.io][cargo/4032]
2120 - [The `--features` option now accepts multiple comma or space
2121 delimited values.][cargo/4084]
2122 - [Added support for custom target specific runners][cargo/3954]
2127 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
2129 - [Rust will now release XZ compressed packages][rust-installer/57]
2130 - [rustup will now prefer to download rust packages with
2131 XZ compression][rustup/1100] over GZip packages.
2132 - [Added the ability to escape `#` in rust documentation][41785] By adding
2133 additional `#`'s ie. `##` is now `#`
2138 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
2139 - [`-Z` flags are now no longer allowed to be used on the stable
2140 compiler.][41751] This has been a warning for a year previous to this.
2141 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
2142 longer works][42844]. Users should migrate to the built-in `check`
2143 command, which has been available since 1.16.
2144 - [Ending a float literal with `._` is now a hard error.
2145 Example: `42._` .][41946]
2146 - [Any use of a private `extern crate` outside of its module is now a
2147 hard error.][36886] This was previously a warning.
2148 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
2149 relative while the `::` prefix makes a path absolute, but was ignored and the
2150 path was relative regardless.
2151 - [Floating point constants in match patterns is now a hard error][36890]
2152 This was previously a warning.
2153 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2154 match patterns is now a hard error][36891] This was previously a warning.
2155 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2157 - [From the pound escape, lines consisting of multiple `#`s are
2159 - [It is an error to re-export private enum variants][42460]. This is
2160 known to break a number of crates that depend on an older version of
2162 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2163 to use it to find the linker, and the build will fail where it did
2164 not previously][42607]
2166 [36886]: https://github.com/rust-lang/rust/issues/36886
2167 [36888]: https://github.com/rust-lang/rust/issues/36888
2168 [36890]: https://github.com/rust-lang/rust/issues/36890
2169 [36891]: https://github.com/rust-lang/rust/issues/36891
2170 [36892]: https://github.com/rust-lang/rust/issues/36892
2171 [37406]: https://github.com/rust-lang/rust/issues/37406
2172 [39983]: https://github.com/rust-lang/rust/pull/39983
2173 [41145]: https://github.com/rust-lang/rust/pull/41145
2174 [41192]: https://github.com/rust-lang/rust/pull/41192
2175 [41258]: https://github.com/rust-lang/rust/pull/41258
2176 [41370]: https://github.com/rust-lang/rust/pull/41370
2177 [41449]: https://github.com/rust-lang/rust/pull/41449
2178 [41530]: https://github.com/rust-lang/rust/pull/41530
2179 [41624]: https://github.com/rust-lang/rust/pull/41624
2180 [41656]: https://github.com/rust-lang/rust/pull/41656
2181 [41659]: https://github.com/rust-lang/rust/pull/41659
2182 [41676]: https://github.com/rust-lang/rust/pull/41676
2183 [41751]: https://github.com/rust-lang/rust/pull/41751
2184 [41764]: https://github.com/rust-lang/rust/pull/41764
2185 [41785]: https://github.com/rust-lang/rust/pull/41785
2186 [41873]: https://github.com/rust-lang/rust/pull/41873
2187 [41907]: https://github.com/rust-lang/rust/pull/41907
2188 [41946]: https://github.com/rust-lang/rust/pull/41946
2189 [42016]: https://github.com/rust-lang/rust/pull/42016
2190 [42037]: https://github.com/rust-lang/rust/pull/42037
2191 [42068]: https://github.com/rust-lang/rust/pull/42068
2192 [42150]: https://github.com/rust-lang/rust/pull/42150
2193 [42162]: https://github.com/rust-lang/rust/pull/42162
2194 [42225]: https://github.com/rust-lang/rust/pull/42225
2195 [42264]: https://github.com/rust-lang/rust/pull/42264
2196 [42302]: https://github.com/rust-lang/rust/pull/42302
2197 [42460]: https://github.com/rust-lang/rust/issues/42460
2198 [42607]: https://github.com/rust-lang/rust/issues/42607
2199 [42740]: https://github.com/rust-lang/rust/pull/42740
2200 [42844]: https://github.com/rust-lang/rust/issues/42844
2201 [42948]: https://github.com/rust-lang/rust/pull/42948
2202 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2203 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2204 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2205 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2206 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2207 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2208 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2209 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2210 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2211 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2212 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2213 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2214 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2215 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2216 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2217 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2218 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2219 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2220 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2221 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2222 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2223 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2226 Version 1.18.0 (2017-06-08)
2227 ===========================
2232 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2233 make the item visible to just that module tree. Also accepts the keyword
2234 `crate` to make something public to the whole crate but not users of the
2235 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2236 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2237 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2238 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2239 types like `Write + Send`, trailing `+` are now supported in trait objects,
2240 and better error reporting for trait objects starting with `?Sized`.
2241 - [0e+10 is now a valid floating point literal][40589]
2242 - [Now warns if you bind a lifetime parameter to 'static][40734]
2243 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2244 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2245 representation in some cases.][40377]
2250 - [rustc can now emit mir with `--emit mir`][39891]
2251 - [Improved LLVM IR for trivial functions][40367]
2252 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2253 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2254 opportunities found through profiling
2255 - [Improved backtrace formatting when panicking][38165]
2260 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2261 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2262 iteration or reallocation.
2263 - [Simplified HashMap Bucket interface][40561] provides performance
2264 improvements for iterating and cloning.
2265 - [Specialize Vec::from_elem to use calloc][40409]
2266 - [Fixed Race condition in fs::create_dir_all][39799]
2267 - [No longer caching stdio on Windows][40516]
2268 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2269 2.50%~ faster and in one case now 12.50% faster.
2270 - [Optimized `AtomicBool::fetch_nand`][41143]
2275 - [`Child::try_wait`]
2276 - [`HashMap::retain`]
2277 - [`HashSet::retain`]
2279 - [`TcpStream::peek`]
2280 - [`UdpSocket::peek`]
2281 - [`UdpSocket::peek_from`]
2286 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2287 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2288 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2289 - [Added Android build support][cargo/3885]
2290 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2291 of a certain type, for example `cargo build --bins` will build all
2293 - [Added support for haiku][cargo/3952]
2298 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2299 - [Added rust-windbg script for better debugging on Windows][39983]
2300 - [Rust now uses the official cross compiler for NetBSD][40612]
2301 - [rustdoc now accepts `#` at the start of files][40828]
2302 - [Fixed jemalloc support for musl][41168]
2307 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2308 always placed after the sign if it exists and before the digits. With the `#`
2309 flag the zeroes are placed after the prefix and before the digits.
2310 - [Due to the struct field optimisation][40377], using `transmute` on structs
2311 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2312 always been undefined behavior, but is now more likely to break in practice.
2313 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2314 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2315 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2316 - [Overlapping inherent `impl`s are now a hard error][40728]
2317 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2318 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2319 `out.asm` and `out.ll` instead of only one of the filetypes.
2320 - [ calling a function that returns `Self` will no longer work][41805] when
2321 the size of `Self` cannot be statically determined.
2322 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2323 this has caused a few regressions namely:
2325 - Changed the link order of local static/dynamic libraries (respecting the
2326 order on given rather than having the compiler reorder).
2327 - Changed how MinGW is linked, native code linked to dynamic libraries
2328 may require manually linking to the gcc support library (for the native
2331 [38165]: https://github.com/rust-lang/rust/pull/38165
2332 [39799]: https://github.com/rust-lang/rust/pull/39799
2333 [39891]: https://github.com/rust-lang/rust/pull/39891
2334 [39983]: https://github.com/rust-lang/rust/pull/39983
2335 [40043]: https://github.com/rust-lang/rust/pull/40043
2336 [40241]: https://github.com/rust-lang/rust/pull/40241
2337 [40338]: https://github.com/rust-lang/rust/pull/40338
2338 [40367]: https://github.com/rust-lang/rust/pull/40367
2339 [40377]: https://github.com/rust-lang/rust/pull/40377
2340 [40409]: https://github.com/rust-lang/rust/pull/40409
2341 [40516]: https://github.com/rust-lang/rust/pull/40516
2342 [40556]: https://github.com/rust-lang/rust/pull/40556
2343 [40561]: https://github.com/rust-lang/rust/pull/40561
2344 [40589]: https://github.com/rust-lang/rust/pull/40589
2345 [40612]: https://github.com/rust-lang/rust/pull/40612
2346 [40723]: https://github.com/rust-lang/rust/pull/40723
2347 [40728]: https://github.com/rust-lang/rust/pull/40728
2348 [40731]: https://github.com/rust-lang/rust/pull/40731
2349 [40734]: https://github.com/rust-lang/rust/pull/40734
2350 [40805]: https://github.com/rust-lang/rust/pull/40805
2351 [40807]: https://github.com/rust-lang/rust/pull/40807
2352 [40828]: https://github.com/rust-lang/rust/pull/40828
2353 [40870]: https://github.com/rust-lang/rust/pull/40870
2354 [41085]: https://github.com/rust-lang/rust/pull/41085
2355 [41143]: https://github.com/rust-lang/rust/pull/41143
2356 [41168]: https://github.com/rust-lang/rust/pull/41168
2357 [41270]: https://github.com/rust-lang/rust/issues/41270
2358 [41469]: https://github.com/rust-lang/rust/pull/41469
2359 [41805]: https://github.com/rust-lang/rust/issues/41805
2360 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2361 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2362 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2363 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2364 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2365 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2366 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2367 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2368 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2369 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2370 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2371 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2372 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2373 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2376 Version 1.17.0 (2017-04-27)
2377 ===========================
2382 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2383 * [Fields of structs may be initialized without duplicating the field/variable
2384 names][39761]. [RFC 1682]
2385 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2386 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2387 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2388 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2389 `'b`. Soundness fix.
2390 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2391 * [Static variables may contain references to other statics][40027]
2396 * [Exit quickly on only `--emit dep-info`][40336]
2397 * [Make `-C relocation-model` more correctly determine whether the linker
2398 creates a position-independent executable][40245]
2399 * [Add `-C overflow-checks` to directly control whether integer overflow
2401 * [The rustc type checker now checks items on demand instead of in a single
2402 in-order pass][40008]. This is mostly an internal refactoring in support of
2403 future work, including incremental type checking, but also resolves [RFC
2404 1647], allowing `Self` to appear in `impl` `where` clauses.
2405 * [Optimize vtable loads][39995]
2406 * [Turn off vectorization for Emscripten targets][39990]
2407 * [Provide suggestions for unknown macros imported with `use`][39953]
2408 * [Fix ICEs in path resolution][39939]
2409 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2410 * [Add clearer error message using `&str + &str`][39116]
2421 * [`Ordering::then`]
2422 * [`Ordering::then_with`]
2423 * [`BTreeMap::range`]
2424 * [`BTreeMap::range_mut`]
2425 * [`collections::Bound`]
2426 * [`process::abort`]
2427 * [`ptr::read_unaligned`]
2428 * [`ptr::write_unaligned`]
2429 * [`Result::expect_err`]
2432 * [`Cell::into_inner`]
2438 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2439 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2440 * [`String` implements `FromIterator<&char>`][40028]
2441 * `Box` [implements][40009] a number of new conversions:
2442 `From<Box<str>> for String`,
2443 `From<Box<[T]>> for Vec<T>`,
2444 `From<Box<CStr>> for CString`,
2445 `From<Box<OsStr>> for OsString`,
2446 `From<Box<Path>> for PathBuf`,
2447 `Into<Box<str>> for String`,
2448 `Into<Box<[T]>> for Vec<T>`,
2449 `Into<Box<CStr>> for CString`,
2450 `Into<Box<OsStr>> for OsString`,
2451 `Into<Box<Path>> for PathBuf`,
2452 `Default for Box<str>`,
2453 `Default for Box<CStr>`,
2454 `Default for Box<OsStr>`,
2455 `From<&CStr> for Box<CStr>`,
2456 `From<&OsStr> for Box<OsStr>`,
2457 `From<&Path> for Box<Path>`
2458 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2459 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2460 * [Slightly optimize `slice::sort`][39538]
2461 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2462 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2463 `Box<str>` implements `From<&str>`][39438]
2464 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2465 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2466 * [`format!` estimates the needed capacity before writing a string][39356]
2467 * [Support unprivileged symlink creation in Windows][38921]
2468 * [`PathBuf` implements `Default`][38764]
2469 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2470 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2471 and poor hash functions.
2476 * [Add `cargo check --all`][cargo/3731]
2477 * [Add an option to ignore SSL revocation checking][cargo/3699]
2478 * [Add `cargo run --package`][cargo/3691]
2479 * [Add `required_features`][cargo/3667]
2480 * [Assume `build.rs` is a build script][cargo/3664]
2481 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2486 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2488 * [The "Unstable Book" documents nightly-only features][ubook]
2489 * [Improve the style of the sidebar in rustdoc output][40265]
2490 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2491 * [Fix MSP430 breakage due to `i128`][40257]
2492 * [Preliminary Solaris/SPARCv9 support][39903]
2493 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2494 run without installing the MSVC runtime.
2495 * [`rustdoc --test` includes file names in test names][39788]
2496 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2497 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2498 * [Initial support for `aarch64-unknown-freebsd`][39491]
2499 * [Initial support for `i686-unknown-netbsd`][39426]
2500 * [This release no longer includes the old makefile build system][39431]. Rust
2501 is built with a custom build system, written in Rust, and with Cargo.
2502 * [Add Debug implementations for libcollection structs][39002]
2503 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2504 * [`--test-threads=0` produces an error][38945]
2505 * [`rustup` installs documentation by default][40526]
2506 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2507 WinDbg and Visual Studio to improve the debugging experience.
2512 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2513 workaround, either use MSVC 2015 or run vcvars.bat.
2514 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2515 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2516 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2518 * [`format!` and `Display::to_string` panic if an underlying formatting
2519 implementation returns an error][40117]. Previously the error was silently
2520 ignored. It is incorrect for `write_fmt` to return an error when writing
2522 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2523 crates were marked stable and could be accessed from the stable toolchain.
2524 * [Rust git source no longer includes vendored crates][39728]. Those that need
2525 to build with vendored crates should build from release tarballs.
2526 * [Fix inert attributes from `proc_macro_derives`][39572]
2527 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2528 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2530 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2531 existing code generally ignores the type of dead-code unless a type-hint is
2532 provided; this can cause surprising inference interactions particularly around
2533 defaulting. The new code uniformly ignores the result type of dead-code.
2534 * [Tuple-struct constructors with private fields are no longer visible][38932]
2535 * [Lifetime parameters that do not appear in the arguments are now considered
2536 early-bound][38897], resolving a soundness bug (#[32330]). The
2537 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2539 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2540 * [Make transmuting from fn item types to pointer-sized types a hard
2543 [27787]: https://github.com/rust-lang/rust/issues/27787
2544 [32330]: https://github.com/rust-lang/rust/issues/32330
2545 [34198]: https://github.com/rust-lang/rust/pull/34198
2546 [38161]: https://github.com/rust-lang/rust/pull/38161
2547 [38368]: https://github.com/rust-lang/rust/pull/38368
2548 [38584]: https://github.com/rust-lang/rust/issues/38584
2549 [38661]: https://github.com/rust-lang/rust/pull/38661
2550 [38764]: https://github.com/rust-lang/rust/pull/38764
2551 [38864]: https://github.com/rust-lang/rust/issues/38864
2552 [38897]: https://github.com/rust-lang/rust/pull/38897
2553 [38921]: https://github.com/rust-lang/rust/pull/38921
2554 [38932]: https://github.com/rust-lang/rust/pull/38932
2555 [38945]: https://github.com/rust-lang/rust/pull/38945
2556 [38981]: https://github.com/rust-lang/rust/pull/38981
2557 [39002]: https://github.com/rust-lang/rust/pull/39002
2558 [39116]: https://github.com/rust-lang/rust/pull/39116
2559 [39193]: https://github.com/rust-lang/rust/pull/39193
2560 [39265]: https://github.com/rust-lang/rust/pull/39265
2561 [39356]: https://github.com/rust-lang/rust/pull/39356
2562 [39372]: https://github.com/rust-lang/rust/pull/39372
2563 [39426]: https://github.com/rust-lang/rust/pull/39426
2564 [39431]: https://github.com/rust-lang/rust/pull/39431
2565 [39438]: https://github.com/rust-lang/rust/pull/39438
2566 [39440]: https://github.com/rust-lang/rust/pull/39440
2567 [39485]: https://github.com/rust-lang/rust/pull/39485
2568 [39491]: https://github.com/rust-lang/rust/pull/39491
2569 [39518]: https://github.com/rust-lang/rust/pull/39518
2570 [39538]: https://github.com/rust-lang/rust/pull/39538
2571 [39572]: https://github.com/rust-lang/rust/pull/39572
2572 [39633]: https://github.com/rust-lang/rust/pull/39633
2573 [39642]: https://github.com/rust-lang/rust/pull/39642
2574 [39728]: https://github.com/rust-lang/rust/pull/39728
2575 [39761]: https://github.com/rust-lang/rust/pull/39761
2576 [39788]: https://github.com/rust-lang/rust/pull/39788
2577 [39793]: https://github.com/rust-lang/rust/pull/39793
2578 [39837]: https://github.com/rust-lang/rust/pull/39837
2579 [39843]: https://github.com/rust-lang/rust/pull/39843
2580 [39851]: https://github.com/rust-lang/rust/pull/39851
2581 [39903]: https://github.com/rust-lang/rust/pull/39903
2582 [39939]: https://github.com/rust-lang/rust/pull/39939
2583 [39953]: https://github.com/rust-lang/rust/pull/39953
2584 [39960]: https://github.com/rust-lang/rust/pull/39960
2585 [39990]: https://github.com/rust-lang/rust/pull/39990
2586 [39995]: https://github.com/rust-lang/rust/pull/39995
2587 [40008]: https://github.com/rust-lang/rust/pull/40008
2588 [40009]: https://github.com/rust-lang/rust/pull/40009
2589 [40027]: https://github.com/rust-lang/rust/pull/40027
2590 [40028]: https://github.com/rust-lang/rust/pull/40028
2591 [40037]: https://github.com/rust-lang/rust/pull/40037
2592 [40117]: https://github.com/rust-lang/rust/pull/40117
2593 [40166]: https://github.com/rust-lang/rust/pull/40166
2594 [40245]: https://github.com/rust-lang/rust/pull/40245
2595 [40257]: https://github.com/rust-lang/rust/pull/40257
2596 [40261]: https://github.com/rust-lang/rust/pull/40261
2597 [40265]: https://github.com/rust-lang/rust/pull/40265
2598 [40319]: https://github.com/rust-lang/rust/pull/40319
2599 [40336]: https://github.com/rust-lang/rust/pull/40336
2600 [40526]: https://github.com/rust-lang/rust/pull/40526
2601 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2602 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2603 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2604 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2605 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2606 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2607 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2608 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2609 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2610 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2611 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2612 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2613 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2614 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2615 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2616 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2617 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2618 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2619 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2620 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2621 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2622 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2623 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2624 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2625 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2626 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2627 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2628 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2629 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2630 [mdbook]: https://crates.io/crates/mdbook
2631 [ubook]: https://doc.rust-lang.org/unstable-book/
2634 Version 1.16.0 (2017-03-16)
2635 ===========================
2640 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2641 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2642 match patterns][38069]
2643 * [Clean up semantics of `self` in an import list][38313]
2644 * [`Self` may appear in `impl` headers][38920]
2645 * [`Self` may appear in struct expressions][39282]
2650 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2651 a `.rmeta` file containing only crate metadata][38571]. This can be
2652 used by tools like the Rust Language Service to perform
2653 metadata-only builds.
2654 * [Levenshtein based typo suggestions now work in most places, while
2655 previously they worked only for fields and sometimes for local
2656 variables][38927]. Together with the overhaul of "no
2657 resolution"/"unexpected resolution" errors (#[38154]) they result in
2658 large and systematic improvement in resolution diagnostics.
2659 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2661 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2662 * [`rustc` no longer attempts to provide "consider using an explicit
2663 lifetime" suggestions][37057]. They were inaccurate.
2668 * [`VecDeque::truncate`]
2669 * [`VecDeque::resize`]
2670 * [`String::insert_str`]
2671 * [`Duration::checked_add`]
2672 * [`Duration::checked_sub`]
2673 * [`Duration::checked_div`]
2674 * [`Duration::checked_mul`]
2677 * [`SocketAddr::is_ipv4`]
2678 * [`SocketAddr::is_ipv6`]
2679 * [`IpAddr::is_ipv4`]
2680 * [`IpAddr::is_ipv6`]
2682 * [`Vec::dedup_by_key`]
2683 * [`Result::unwrap_or_default`]
2684 * [`<*const T>::wrapping_offset`]
2685 * [`<*mut T>::wrapping_offset`]
2686 * `CommandExt::creation_flags`
2687 * [`File::set_permissions`]
2688 * [`String::split_off`]
2693 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2694 their argument by `Borrow` parameter][37761]
2695 * [All public types in std implement `Debug`][38006]
2696 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2697 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2698 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2700 * [std: Fix partial writes in `LineWriter`][38062]
2701 * [std: Clamp max read/write sizes on Unix][38062]
2702 * [Use more specific panic message for `&str` slicing errors][38066]
2703 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2704 functionality cannot be achieved in std currently.
2705 * [`writeln!`, like `println!`, now accepts a form with no string
2706 or formatting arguments, to just print a newline][38469]
2707 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2708 * [Reduce the size of static data in `std_unicode::tables`][38781]
2709 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2710 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2712 * [`Duration` implements `Sum`][38712]
2713 * [`String` implements `ToSocketAddrs`][39048]
2718 * [The `cargo check` command does a type check of a project without
2719 building it][cargo/3296]
2720 * [crates.io will display CI badges from Travis and AppVeyor, if
2721 specified in Cargo.toml][cargo/3546]
2722 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2723 * [Compilation profiles accept integer values for `debug`, in addition
2724 to `true` and `false`. These are passed to `rustc` as the value to
2725 `-C debuginfo`][cargo/3534]
2726 * [Implement `cargo --version --verbose`][cargo/3604]
2727 * [All builds now output 'dep-info' build dependencies compatible with
2728 make and ninja][cargo/3557]
2729 * [Build all workspace members with `build --all`][cargo/3511]
2730 * [Document all workspace members with `doc --all`][cargo/3515]
2731 * [Path deps outside workspace are not members][cargo/3443]
2736 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2737 the path to the Rust implementation][38589]
2738 * [The `armv7-linux-androideabi` target no longer enables NEON
2739 extensions, per Google's ABI guide][38413]
2740 * [The stock standard library can be compiled for Redox OS][38401]
2741 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2743 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2745 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2750 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2751 match patterns][38069]
2752 * In this release, references to uninhabited types can not be
2753 pattern-matched. This was accidentally allowed in 1.15.
2754 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2755 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2757 * [Clean up semantics of `self` in an import list][38313]
2758 * Reimplemented lifetime elision. This change was almost entirely compatible
2759 with existing code, but it did close a number of small bugs and loopholes,
2760 as well as being more accepting in some other [cases][41105].
2762 [37057]: https://github.com/rust-lang/rust/pull/37057
2763 [37761]: https://github.com/rust-lang/rust/pull/37761
2764 [38006]: https://github.com/rust-lang/rust/pull/38006
2765 [38051]: https://github.com/rust-lang/rust/pull/38051
2766 [38062]: https://github.com/rust-lang/rust/pull/38062
2767 [38062]: https://github.com/rust-lang/rust/pull/38622
2768 [38066]: https://github.com/rust-lang/rust/pull/38066
2769 [38069]: https://github.com/rust-lang/rust/pull/38069
2770 [38131]: https://github.com/rust-lang/rust/pull/38131
2771 [38154]: https://github.com/rust-lang/rust/pull/38154
2772 [38274]: https://github.com/rust-lang/rust/pull/38274
2773 [38304]: https://github.com/rust-lang/rust/pull/38304
2774 [38313]: https://github.com/rust-lang/rust/pull/38313
2775 [38314]: https://github.com/rust-lang/rust/pull/38314
2776 [38327]: https://github.com/rust-lang/rust/pull/38327
2777 [38401]: https://github.com/rust-lang/rust/pull/38401
2778 [38413]: https://github.com/rust-lang/rust/pull/38413
2779 [38469]: https://github.com/rust-lang/rust/pull/38469
2780 [38559]: https://github.com/rust-lang/rust/pull/38559
2781 [38571]: https://github.com/rust-lang/rust/pull/38571
2782 [38580]: https://github.com/rust-lang/rust/pull/38580
2783 [38589]: https://github.com/rust-lang/rust/pull/38589
2784 [38670]: https://github.com/rust-lang/rust/pull/38670
2785 [38712]: https://github.com/rust-lang/rust/pull/38712
2786 [38726]: https://github.com/rust-lang/rust/pull/38726
2787 [38781]: https://github.com/rust-lang/rust/pull/38781
2788 [38798]: https://github.com/rust-lang/rust/pull/38798
2789 [38909]: https://github.com/rust-lang/rust/pull/38909
2790 [38920]: https://github.com/rust-lang/rust/pull/38920
2791 [38927]: https://github.com/rust-lang/rust/pull/38927
2792 [39048]: https://github.com/rust-lang/rust/pull/39048
2793 [39282]: https://github.com/rust-lang/rust/pull/39282
2794 [39379]: https://github.com/rust-lang/rust/pull/39379
2795 [41105]: https://github.com/rust-lang/rust/issues/41105
2796 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2797 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2798 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2799 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2800 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2801 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2802 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2803 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2804 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2805 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2806 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2807 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2808 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2809 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2810 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2811 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2812 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2813 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2814 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2815 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2816 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2817 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2818 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2819 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2820 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2821 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2822 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2823 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2824 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2825 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2828 Version 1.15.1 (2017-02-09)
2829 ===========================
2831 * [Fix IntoIter::as_mut_slice's signature][39466]
2832 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2834 [39466]: https://github.com/rust-lang/rust/pull/39466
2835 [39523]: https://github.com/rust-lang/rust/pull/39523
2838 Version 1.15.0 (2017-02-02)
2839 ===========================
2844 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2845 stable. This allows popular code-generating crates like Serde and Diesel to
2846 work ergonomically. [RFC 1681].
2847 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2848 with curly braces][36868]. Part of [RFC 1506].
2849 * [A number of minor changes to name resolution have been activated][37127].
2850 They add up to more consistent semantics, allowing for future evolution of
2851 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2852 details of what is different. The breaking changes here have been transitioned
2853 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2854 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2856 * [`?Sized` can be used in `where` clauses][37791]
2857 * [There is now a limit on the size of monomorphized types and it can be
2858 modified with the `#![type_size_limit]` crate attribute, similarly to
2859 the `#![recursion_limit]` attribute][37789]
2864 * [On Windows, the compiler will apply dllimport attributes when linking to
2865 extern functions][37973]. Additional attributes and flags can control which
2866 library kind is linked and its name. [RFC 1717].
2867 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2868 * [The `--test` flag works with procedural macro crates][38107]
2869 * [Fix `extern "aapcs" fn` ABI][37814]
2870 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2871 * [The `format!` expander recognizes incorrect `printf` and shell-style
2872 formatting directives and suggests the correct format][37613].
2873 * [Only report one error for all unused imports in an import list][37456]
2875 Compiler Performance
2876 --------------------
2878 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2879 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2880 * [Don't clone in `UnificationTable::probe`][37848]
2881 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2882 * [Use small vectors in type walker][37760]
2883 * [Macro expansion performance was improved][37701]
2884 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2885 * [Replace FNV with a faster hash function][37229]
2890 * [`std::iter::Iterator::min_by`]
2891 * [`std::iter::Iterator::max_by`]
2892 * [`std::os::*::fs::FileExt`]
2893 * [`std::sync::atomic::Atomic*::get_mut`]
2894 * [`std::sync::atomic::Atomic*::into_inner`]
2895 * [`std::vec::IntoIter::as_slice`]
2896 * [`std::vec::IntoIter::as_mut_slice`]
2897 * [`std::sync::mpsc::Receiver::try_iter`]
2898 * [`std::os::unix::process::CommandExt::before_exec`]
2899 * [`std::rc::Rc::strong_count`]
2900 * [`std::rc::Rc::weak_count`]
2901 * [`std::sync::Arc::strong_count`]
2902 * [`std::sync::Arc::weak_count`]
2903 * [`std::char::encode_utf8`]
2904 * [`std::char::encode_utf16`]
2905 * [`std::cell::Ref::clone`]
2906 * [`std::io::Take::into_inner`]
2911 * [The standard sorting algorithm has been rewritten for dramatic performance
2912 improvements][38192]. It is a hybrid merge sort, drawing influences from
2913 Timsort. Previously it was a naive merge sort.
2914 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2915 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2917 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2918 and `char_indices().last()`][37882]
2919 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2920 * [Chinese characters display correctly in `fmt::Debug`][37855]
2921 * [Derive `Default` for `Duration`][37699]
2922 * [Support creation of anonymous pipes on WinXP/2k][37677]
2923 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2924 * [Don't pass overlapped handles to processes][38835]
2929 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2930 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2931 should instead check the variable at runtime with `std::env`. That the value
2932 was set at build time was a bug, and incorrect when cross-compiling. This
2933 change is known to cause breakage.
2934 * [Add `--all` flag to `cargo test`][cargo/3221]
2935 * [Compile statically against the MSVC CRT][cargo/3363]
2936 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2937 * [Link OpenSSL statically on OSX][cargo/3311]
2938 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2939 * [Test for bad path overrides with summaries][cargo/3336]
2940 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2941 * [Fix retrying crate downloads for network errors][cargo/3348]
2942 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2943 * [Emit more info on --message-format=json][cargo/3319]
2944 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2945 * [Don't ignore errors in workspace manifest][cargo/3409]
2946 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2951 * [Test runners (binaries built with `--test`) now support a `--list` argument
2952 that lists the tests it contains][38185]
2953 * [Test runners now support a `--exact` argument that makes the test filter
2954 match exactly, instead of matching only a substring of the test name][38181]
2955 * [rustdoc supports a `--playground-url` flag][37763]
2956 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2961 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2962 continue to be used in this release by passing `--disable-rustbuild` to the
2963 configure script, but they will be deleted soon. Note that the new build
2964 system uses a different on-disk layout that will likely affect any scripts
2966 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2968 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2969 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2975 * [A number of minor changes to name resolution have been activated][37127].
2976 They add up to more consistent semantics, allowing for future evolution of
2977 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2978 details of what is different. The breaking changes here have been transitioned
2979 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2980 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2981 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2982 should instead check the variable at runtime with `std::env`. That the value
2983 was set at build time was a bug, and incorrect when cross-compiling. This
2984 change is known to cause breakage.
2985 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2986 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2987 1.10 and is now an error by default. It will become a hard error in the near
2989 * [The semantics relating modules to file system directories are changing in
2990 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2991 lint, which is a warning in this release, and will become a hard error in the
2993 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2994 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2995 the underlying iterator][37834]
2997 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2998 [33685]: https://github.com/rust-lang/rust/issues/33685
2999 [36868]: https://github.com/rust-lang/rust/pull/36868
3000 [37127]: https://github.com/rust-lang/rust/pull/37127
3001 [37229]: https://github.com/rust-lang/rust/pull/37229
3002 [37456]: https://github.com/rust-lang/rust/pull/37456
3003 [37527]: https://github.com/rust-lang/rust/pull/37527
3004 [37602]: https://github.com/rust-lang/rust/pull/37602
3005 [37613]: https://github.com/rust-lang/rust/pull/37613
3006 [37615]: https://github.com/rust-lang/rust/pull/37615
3007 [37636]: https://github.com/rust-lang/rust/pull/37636
3008 [37627]: https://github.com/rust-lang/rust/pull/37627
3009 [37642]: https://github.com/rust-lang/rust/pull/37642
3010 [37677]: https://github.com/rust-lang/rust/pull/37677
3011 [37699]: https://github.com/rust-lang/rust/pull/37699
3012 [37701]: https://github.com/rust-lang/rust/pull/37701
3013 [37705]: https://github.com/rust-lang/rust/pull/37705
3014 [37749]: https://github.com/rust-lang/rust/pull/37749
3015 [37760]: https://github.com/rust-lang/rust/pull/37760
3016 [37763]: https://github.com/rust-lang/rust/pull/37763
3017 [37764]: https://github.com/rust-lang/rust/pull/37764
3018 [37789]: https://github.com/rust-lang/rust/pull/37789
3019 [37791]: https://github.com/rust-lang/rust/pull/37791
3020 [37814]: https://github.com/rust-lang/rust/pull/37814
3021 [37817]: https://github.com/rust-lang/rust/pull/37817
3022 [37834]: https://github.com/rust-lang/rust/pull/37834
3023 [37848]: https://github.com/rust-lang/rust/pull/37848
3024 [37855]: https://github.com/rust-lang/rust/pull/37855
3025 [37882]: https://github.com/rust-lang/rust/pull/37882
3026 [37888]: https://github.com/rust-lang/rust/pull/37888
3027 [37973]: https://github.com/rust-lang/rust/pull/37973
3028 [37979]: https://github.com/rust-lang/rust/pull/37979
3029 [38086]: https://github.com/rust-lang/rust/pull/38086
3030 [38107]: https://github.com/rust-lang/rust/pull/38107
3031 [38117]: https://github.com/rust-lang/rust/pull/38117
3032 [38134]: https://github.com/rust-lang/rust/pull/38134
3033 [38146]: https://github.com/rust-lang/rust/pull/38146
3034 [38181]: https://github.com/rust-lang/rust/pull/38181
3035 [38182]: https://github.com/rust-lang/rust/pull/38182
3036 [38185]: https://github.com/rust-lang/rust/pull/38185
3037 [38192]: https://github.com/rust-lang/rust/pull/38192
3038 [38279]: https://github.com/rust-lang/rust/pull/38279
3039 [38835]: https://github.com/rust-lang/rust/pull/38835
3040 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3041 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3042 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
3043 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
3044 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
3045 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
3046 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
3047 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
3048 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
3049 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
3050 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
3051 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
3052 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
3053 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
3054 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
3055 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
3056 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
3057 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
3058 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
3059 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
3060 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
3061 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
3062 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
3063 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
3064 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
3065 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
3066 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
3067 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
3068 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
3069 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
3070 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
3071 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
3072 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
3073 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
3074 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
3075 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
3076 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
3077 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
3080 Version 1.14.0 (2016-12-22)
3081 ===========================
3086 * [`..` matches multiple tuple fields in enum variants, structs
3087 and tuples][36843]. [RFC 1492].
3088 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
3089 * [`use *` and `use ::*` both glob-import from the crate root][37367]
3090 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
3091 dereferencing][36822]
3096 * [Mark enums with non-zero discriminant as non-zero][37224]
3097 * [Lower-case `static mut` names are linted like other
3098 statics and consts][37162]
3099 * [Fix ICE on some macros in const integer positions
3100 (e.g. `[u8; m!()]`)][36819]
3101 * [Improve error message and snippet for "did you mean `x`"][36798]
3102 * [Add a panic-strategy field to the target specification][36794]
3103 * [Include LLVM version in `--version --verbose`][37200]
3105 Compile-time Optimizations
3106 --------------------------
3108 * [Improve macro expansion performance][37569]
3109 * [Shrink `Expr_::ExprInlineAsm`][37445]
3110 * [Replace all uses of SHA-256 with BLAKE2b][37439]
3111 * [Reduce the number of bytes hashed by `IchHasher`][37427]
3112 * [Avoid more allocations when compiling html5ever][37373]
3113 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
3114 * [Avoid some allocations in the macro parser][37318]
3115 * [Use a faster deflate setting][37298]
3116 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
3117 during interning of slices][37270]
3118 * [Optimize `write_metadata`][37267]
3119 * [Don't process obligation forest cycles when stalled][37231]
3120 * [Avoid many `CrateConfig` clones][37161]
3121 * [Optimize `Substs::super_fold_with`][37108]
3122 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
3123 * [Speed up `plug_leaks`][36917]
3128 * [`println!()`, with no arguments, prints newline][36825].
3129 Previously, an empty string was required to achieve the same.
3130 * [`Wrapping` impls standard binary and unary operators, as well as
3131 the `Sum` and `Product` iterators][37356]
3132 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
3134 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
3135 `VecDeque` iterators][37315]
3136 * [Improve `SipHasher` performance on small values][37312]
3137 * [Add Iterator trait TrustedLen to enable better FromIterator /
3139 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
3140 * [`ReadDir` implements `Debug`][37221]
3141 * [Implement `RefUnwindSafe` for atomic types][37178]
3142 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
3143 * [Avoid allocations in `Decoder::read_str`][37064]
3144 * [`io::Error` implements `From<io::ErrorKind>`][37037]
3145 * [Impl `Debug` for raw pointers to unsized data][36880]
3146 * [Don't reuse `HashMap` random seeds][37470]
3147 * [The internal memory layout of `HashMap` is more cache-friendly, for
3148 significant improvements in some operations][36692]
3149 * [`HashMap` uses less memory on 32-bit architectures][36595]
3150 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3155 * [Expose rustc cfg values to build scripts][cargo/3243]
3156 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3157 * [Fix passing --features when testing multiple packages][cargo/3280]
3158 * [Use a single profile set per workspace][cargo/3249]
3159 * [Load `replace` sections from lock files][cargo/3220]
3160 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3165 * [rustup is the recommended Rust installation method][1.14rustup]
3166 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3167 S390x. These are [tier 2] platforms and may have major defects. Follow the
3168 instructions on the website to install, or add the targets to an existing
3169 installation with `rustup target add`. The new target triples are:
3170 - `mips-unknown-linux-gnu`
3171 - `mipsel-unknown-linux-gnu`
3172 - `mips64-unknown-linux-gnuabi64`
3173 - `mips64el-unknown-linux-gnuabi64 `
3174 - `powerpc-unknown-linux-gnu`
3175 - `powerpc64-unknown-linux-gnu`
3176 - `powerpc64le-unknown-linux-gnu`
3177 - `s390x-unknown-linux-gnu `
3178 * This release includes target (std) builds for ARM Linux running MUSL
3179 libc. These are [tier 2] platforms and may have major defects. Add the
3180 following triples to an existing rustup installation with `rustup target add`:
3181 - `arm-unknown-linux-musleabi`
3182 - `arm-unknown-linux-musleabihf`
3183 - `armv7-unknown-linux-musleabihf`
3184 * This release includes [experimental support for WebAssembly][1.14wasm], via
3185 the `wasm32-unknown-emscripten` target. This target is known to have major
3186 defects. Please test, report, and fix.
3187 * rustup no longer installs documentation by default. Run `rustup
3188 component add rust-docs` to install.
3189 * [Fix line stepping in debugger][37310]
3190 * [Enable line number debuginfo in releases][37280]
3195 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3196 * [Add support for Fuchsia OS][37313]
3197 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3202 * [A number of forward-compatibility lints used by the compiler
3203 to gradually introduce language changes have been converted
3204 to deny by default][36894]:
3205 - ["use of inaccessible extern crate erroneously allowed"][36886]
3206 - ["type parameter default erroneously allowed in invalid location"][36887]
3207 - ["detects super or self keywords at the beginning of global path"][36888]
3208 - ["two overlapping inherent impls define an item with the same name
3209 were erroneously allowed"][36889]
3210 - ["floating-point constants cannot be used in patterns"][36890]
3211 - ["constants of struct or enum type can only be used in a pattern if
3212 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3213 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3214 * [Prohibit patterns in trait methods without bodies][37378]
3215 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3216 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3217 * [The `$crate` macro variable is accepted in fewer locations][37213]
3218 * [Impls specifying extra region requirements beyond the trait
3219 they implement are rejected][37167]
3220 * [Enums may not be unsized][37111]. Unsized enums are intended to
3221 work but never have. For now they are forbidden.
3222 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3224 [tier 2]: https://forge.rust-lang.org/platform-support.html
3225 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3226 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3227 [36430]: https://github.com/rust-lang/rust/pull/36430
3228 [36595]: https://github.com/rust-lang/rust/pull/36595
3229 [36595]: https://github.com/rust-lang/rust/pull/36595
3230 [36692]: https://github.com/rust-lang/rust/pull/36692
3231 [36767]: https://github.com/rust-lang/rust/pull/36767
3232 [36794]: https://github.com/rust-lang/rust/pull/36794
3233 [36798]: https://github.com/rust-lang/rust/pull/36798
3234 [36819]: https://github.com/rust-lang/rust/pull/36819
3235 [36822]: https://github.com/rust-lang/rust/pull/36822
3236 [36825]: https://github.com/rust-lang/rust/pull/36825
3237 [36843]: https://github.com/rust-lang/rust/pull/36843
3238 [36880]: https://github.com/rust-lang/rust/pull/36880
3239 [36886]: https://github.com/rust-lang/rust/issues/36886
3240 [36887]: https://github.com/rust-lang/rust/issues/36887
3241 [36888]: https://github.com/rust-lang/rust/issues/36888
3242 [36889]: https://github.com/rust-lang/rust/issues/36889
3243 [36890]: https://github.com/rust-lang/rust/issues/36890
3244 [36891]: https://github.com/rust-lang/rust/issues/36891
3245 [36892]: https://github.com/rust-lang/rust/issues/36892
3246 [36894]: https://github.com/rust-lang/rust/pull/36894
3247 [36917]: https://github.com/rust-lang/rust/pull/36917
3248 [36993]: https://github.com/rust-lang/rust/pull/36993
3249 [37037]: https://github.com/rust-lang/rust/pull/37037
3250 [37064]: https://github.com/rust-lang/rust/pull/37064
3251 [37094]: https://github.com/rust-lang/rust/pull/37094
3252 [37108]: https://github.com/rust-lang/rust/pull/37108
3253 [37111]: https://github.com/rust-lang/rust/pull/37111
3254 [37161]: https://github.com/rust-lang/rust/pull/37161
3255 [37162]: https://github.com/rust-lang/rust/pull/37162
3256 [37167]: https://github.com/rust-lang/rust/pull/37167
3257 [37178]: https://github.com/rust-lang/rust/pull/37178
3258 [37200]: https://github.com/rust-lang/rust/pull/37200
3259 [37213]: https://github.com/rust-lang/rust/pull/37213
3260 [37221]: https://github.com/rust-lang/rust/pull/37221
3261 [37224]: https://github.com/rust-lang/rust/pull/37224
3262 [37230]: https://github.com/rust-lang/rust/pull/37230
3263 [37231]: https://github.com/rust-lang/rust/pull/37231
3264 [37247]: https://github.com/rust-lang/rust/pull/37247
3265 [37267]: https://github.com/rust-lang/rust/pull/37267
3266 [37270]: https://github.com/rust-lang/rust/pull/37270
3267 [37273]: https://github.com/rust-lang/rust/pull/37273
3268 [37280]: https://github.com/rust-lang/rust/pull/37280
3269 [37298]: https://github.com/rust-lang/rust/pull/37298
3270 [37306]: https://github.com/rust-lang/rust/pull/37306
3271 [37310]: https://github.com/rust-lang/rust/pull/37310
3272 [37312]: https://github.com/rust-lang/rust/pull/37312
3273 [37313]: https://github.com/rust-lang/rust/pull/37313
3274 [37315]: https://github.com/rust-lang/rust/pull/37315
3275 [37318]: https://github.com/rust-lang/rust/pull/37318
3276 [37322]: https://github.com/rust-lang/rust/pull/37322
3277 [37326]: https://github.com/rust-lang/rust/pull/37326
3278 [37351]: https://github.com/rust-lang/rust/pull/37351
3279 [37356]: https://github.com/rust-lang/rust/pull/37356
3280 [37367]: https://github.com/rust-lang/rust/pull/37367
3281 [37373]: https://github.com/rust-lang/rust/pull/37373
3282 [37378]: https://github.com/rust-lang/rust/pull/37378
3283 [37389]: https://github.com/rust-lang/rust/pull/37389
3284 [37392]: https://github.com/rust-lang/rust/pull/37392
3285 [37427]: https://github.com/rust-lang/rust/pull/37427
3286 [37439]: https://github.com/rust-lang/rust/pull/37439
3287 [37445]: https://github.com/rust-lang/rust/pull/37445
3288 [37470]: https://github.com/rust-lang/rust/pull/37470
3289 [37569]: https://github.com/rust-lang/rust/pull/37569
3290 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3291 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3292 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3293 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3294 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3295 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3296 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3299 Version 1.13.0 (2016-11-10)
3300 ===========================
3305 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3306 errors, like the `try!` macro, described in [RFC 0243].
3307 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3308 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3309 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3310 * [Fix lifetime rules for 'if' conditions][36029]
3311 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3316 * [Add the `-C link-arg` argument][36574]
3317 * [Remove the old AST-based backend from rustc_trans][35764]
3318 * [Don't enable NEON by default on armv7 Linux][35814]
3319 * [Fix debug line number info for macro expansions][35238]
3320 * [Do not emit "class method" debuginfo for types that are not
3321 DICompositeType][36008]
3322 * [Warn about multiple conflicting #[repr] hints][34623]
3323 * [When sizing DST, don't double-count nested struct prefixes][36351]
3324 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3325 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3326 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3327 * [Expand macros without recursing to avoid stack overflows][36214]
3332 * [Replace macro backtraces with labeled local uses][35702]
3333 * [Improve error message for misplaced doc comments][33922]
3334 * [Buffer unix and lock windows to prevent message interleaving][35975]
3335 * [Update lifetime errors to specifically note temporaries][36171]
3336 * [Special case a few colors for Windows][36178]
3337 * [Suggest `use self` when such an import resolves][36289]
3338 * [Be more specific when type parameter shadows primitive type][36338]
3339 * Many minor improvements
3341 Compile-time Optimizations
3342 --------------------------
3344 * [Compute and cache HIR hashes at beginning][35854]
3345 * [Don't hash types in loan paths][36004]
3346 * [Cache projections in trans][35761]
3347 * [Optimize the parser's last token handling][36527]
3348 * [Only instantiate #[inline] functions in codegen units referencing
3349 them][36524]. This leads to big improvements in cases where crates export
3350 define many inline functions without using them directly.
3351 * [Lazily allocate TypedArena's first chunk][36592]
3352 * [Don't allocate during default HashSet creation][36734]
3359 * [`overflowing_abs`]
3360 * [`RefCell::try_borrow`]
3361 * [`RefCell::try_borrow_mut`]
3366 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3367 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3369 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3370 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3371 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3372 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3373 * [Use arc4rand on FreeBSD][35884]
3374 * [memrchr: Correct aligned offset computation][35969]
3375 * [Improve Demangling of Rust Symbols][36059]
3376 * [Use monotonic time in condition variables][35048]
3377 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3378 * [Implement conversion traits for `char`][35755]
3379 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3380 * [Zero first byte of CString on drop][36264]
3381 * [Inherit overflow checks for sum and product][36372]
3382 * [Add missing Eq implementations][36423]
3383 * [Implement `Debug` for `DirEntry`][36631]
3384 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3386 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3387 * [Implement more traits for `std::io::ErrorKind`][35911]
3388 * [Optimize BinaryHeap bounds checking][36072]
3389 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3390 `extend_with_element`][36355]
3391 * [Fix overflow checking in unsigned pow()][34942]
3396 * This release includes security fixes to both curl and OpenSSL.
3397 * [Fix transitive doctests when panic=abort][cargo/3021]
3398 * [Add --all-features flag to cargo][cargo/3038]
3399 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3400 * [Don't parse the home directory more than once][cargo/3078]
3401 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3402 * [Update OpenSSL to 1.0.2j][cargo/3121]
3403 * [Add license and license_file to cargo metadata output][cargo/3110]
3404 * [Make crates-io registry URL optional in config; ignore all changes to
3405 source.crates-io][cargo/3089]
3406 * [Don't download dependencies from other platforms][cargo/3123]
3407 * [Build transitive dev-dependencies when needed][cargo/3125]
3408 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3409 * [Avoid updating registry when adding existing deps][cargo/3144]
3410 * [Warn about path overrides that won't work][cargo/3136]
3411 * [Use workspaces during `cargo install`][cargo/3146]
3412 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3413 * [Add --message-format flag][cargo/3000]
3414 * [Pass target environment for rustdoc][cargo/3205]
3415 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3416 * [Update curl and curl-sys][cargo/3241]
3417 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3422 * [rustdoc: Add the `--sysroot` argument][36586]
3423 * [rustdoc: Fix a couple of issues with the search results][35655]
3424 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3425 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3426 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3431 * [Remove unmaintained style guide][35124]
3432 * [Add s390x support][36369]
3433 * [Initial work at Haiku OS support][36727]
3434 * [Add mips-uclibc targets][35734]
3435 * [Crate-ify compiler-rt into compiler-builtins][35021]
3436 * [Add rustc version info (git hash + date) to dist tarball][36213]
3437 * Many documentation improvements
3442 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3443 * [Deny (by default) transmuting from fn item types to pointer-sized
3444 types][34923]. Continuing the long transition to zero-sized fn items,
3446 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3448 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3449 * [Fix lifetime rules for 'if' conditions][36029].
3450 * [Inherit overflow checks for sum and product][36372].
3451 * [Forbid user-defined macros named "macro_rules"][36730].
3453 [33922]: https://github.com/rust-lang/rust/pull/33922
3454 [34623]: https://github.com/rust-lang/rust/pull/34623
3455 [34923]: https://github.com/rust-lang/rust/pull/34923
3456 [34942]: https://github.com/rust-lang/rust/pull/34942
3457 [34982]: https://github.com/rust-lang/rust/pull/34982
3458 [35021]: https://github.com/rust-lang/rust/pull/35021
3459 [35048]: https://github.com/rust-lang/rust/pull/35048
3460 [35074]: https://github.com/rust-lang/rust/pull/35074
3461 [35124]: https://github.com/rust-lang/rust/pull/35124
3462 [35234]: https://github.com/rust-lang/rust/pull/35234
3463 [35238]: https://github.com/rust-lang/rust/pull/35238
3464 [35354]: https://github.com/rust-lang/rust/pull/35354
3465 [35559]: https://github.com/rust-lang/rust/pull/35559
3466 [35585]: https://github.com/rust-lang/rust/pull/35585
3467 [35627]: https://github.com/rust-lang/rust/pull/35627
3468 [35655]: https://github.com/rust-lang/rust/pull/35655
3469 [35702]: https://github.com/rust-lang/rust/pull/35702
3470 [35707]: https://github.com/rust-lang/rust/pull/35707
3471 [35728]: https://github.com/rust-lang/rust/pull/35728
3472 [35734]: https://github.com/rust-lang/rust/pull/35734
3473 [35755]: https://github.com/rust-lang/rust/pull/35755
3474 [35761]: https://github.com/rust-lang/rust/pull/35761
3475 [35764]: https://github.com/rust-lang/rust/pull/35764
3476 [35814]: https://github.com/rust-lang/rust/pull/35814
3477 [35854]: https://github.com/rust-lang/rust/pull/35854
3478 [35871]: https://github.com/rust-lang/rust/pull/35871
3479 [35884]: https://github.com/rust-lang/rust/pull/35884
3480 [35911]: https://github.com/rust-lang/rust/pull/35911
3481 [35969]: https://github.com/rust-lang/rust/pull/35969
3482 [35975]: https://github.com/rust-lang/rust/pull/35975
3483 [36004]: https://github.com/rust-lang/rust/pull/36004
3484 [36008]: https://github.com/rust-lang/rust/pull/36008
3485 [36014]: https://github.com/rust-lang/rust/pull/36014
3486 [36029]: https://github.com/rust-lang/rust/pull/36029
3487 [36059]: https://github.com/rust-lang/rust/pull/36059
3488 [36072]: https://github.com/rust-lang/rust/pull/36072
3489 [36101]: https://github.com/rust-lang/rust/pull/36101
3490 [36104]: https://github.com/rust-lang/rust/pull/36104
3491 [36171]: https://github.com/rust-lang/rust/pull/36171
3492 [36173]: https://github.com/rust-lang/rust/pull/36173
3493 [36178]: https://github.com/rust-lang/rust/pull/36178
3494 [36213]: https://github.com/rust-lang/rust/pull/36213
3495 [36214]: https://github.com/rust-lang/rust/pull/36214
3496 [36264]: https://github.com/rust-lang/rust/pull/36264
3497 [36266]: https://github.com/rust-lang/rust/pull/36266
3498 [36289]: https://github.com/rust-lang/rust/pull/36289
3499 [36338]: https://github.com/rust-lang/rust/pull/36338
3500 [36351]: https://github.com/rust-lang/rust/pull/36351
3501 [36355]: https://github.com/rust-lang/rust/pull/36355
3502 [36369]: https://github.com/rust-lang/rust/pull/36369
3503 [36372]: https://github.com/rust-lang/rust/pull/36372
3504 [36423]: https://github.com/rust-lang/rust/pull/36423
3505 [36482]: https://github.com/rust-lang/rust/pull/36482
3506 [36505]: https://github.com/rust-lang/rust/pull/36505
3507 [36524]: https://github.com/rust-lang/rust/pull/36524
3508 [36527]: https://github.com/rust-lang/rust/pull/36527
3509 [36551]: https://github.com/rust-lang/rust/pull/36551
3510 [36574]: https://github.com/rust-lang/rust/pull/36574
3511 [36586]: https://github.com/rust-lang/rust/pull/36586
3512 [36592]: https://github.com/rust-lang/rust/pull/36592
3513 [36631]: https://github.com/rust-lang/rust/pull/36631
3514 [36639]: https://github.com/rust-lang/rust/pull/36639
3515 [36721]: https://github.com/rust-lang/rust/pull/36721
3516 [36727]: https://github.com/rust-lang/rust/pull/36727
3517 [36730]: https://github.com/rust-lang/rust/pull/36730
3518 [36734]: https://github.com/rust-lang/rust/pull/36734
3519 [36754]: https://github.com/rust-lang/rust/pull/36754
3520 [36995]: https://github.com/rust-lang/rust/pull/36995
3521 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3522 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3523 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3524 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3525 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3526 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3527 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3528 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3529 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3530 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3531 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3532 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3533 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3534 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3535 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3536 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3537 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3538 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3539 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3540 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3541 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3542 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3543 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3544 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3545 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3546 [rustup]: https://www.rustup.rs
3547 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3548 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3549 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3550 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3551 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3552 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3553 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3556 Version 1.12.1 (2016-10-20)
3557 ===========================
3562 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3563 * [Confusion with double negation and booleans][36856]
3564 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3565 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3566 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3567 * [Corrupted memory after updated to 1.12][36936]
3568 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3569 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3570 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3572 [36381]: https://github.com/rust-lang/rust/issues/36381
3573 [36856]: https://github.com/rust-lang/rust/issues/36856
3574 [36875]: https://github.com/rust-lang/rust/issues/36875
3575 [36924]: https://github.com/rust-lang/rust/issues/36924
3576 [36926]: https://github.com/rust-lang/rust/issues/36926
3577 [36936]: https://github.com/rust-lang/rust/issues/36936
3578 [37026]: https://github.com/rust-lang/rust/issues/37026
3579 [37112]: https://github.com/rust-lang/rust/issues/37112
3580 [37153]: https://github.com/rust-lang/rust/issues/37153
3583 Version 1.12.0 (2016-09-29)
3584 ===========================
3589 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3590 This translation pass is far simpler than the previous AST->LLVM pass, and
3591 creates opportunities to perform new optimizations directly on the MIR. It
3592 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3593 * [`rustc` presents a new, more readable error format, along with
3594 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3595 Most common editors supporting Rust have been updated to work with it. It was
3596 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3601 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3602 This translation pass is far simpler than the previous AST->LLVM pass, and
3603 creates opportunities to perform new optimizations directly on the MIR. It
3604 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3605 * [Print the Rust target name, not the LLVM target name, with
3606 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3607 * [The computation of `TypeId` is correct in some cases where it was previously
3608 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3609 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3610 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3611 `--print relocation-models`, and `--print code-models` print the available
3612 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3613 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3614 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3615 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3616 These targets produce statically-linked binaries. There are no binary release
3622 * [`rustc` presents a new, more readable error format, along with
3623 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3624 Most common editors supporting Rust have been updated to work with it. It was
3625 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3626 * [In error descriptions, references are now described in plain English,
3627 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3628 * [In error type descriptions, unknown numeric types are named `{integer}` or
3629 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3630 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3635 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3636 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3637 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3638 useful](https://github.com/rust-lang/rust/pull/34908)
3639 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3640 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3641 * [Semicolons are properly required as statement delimiters inside
3642 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3643 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3648 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3649 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3650 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3651 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3652 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3653 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3654 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3655 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3656 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3657 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3658 Both on Unix and Windows.
3659 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3660 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3661 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3662 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3663 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3664 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3665 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3666 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3671 * [The `format!` macro and friends now allow a single argument to be formatted
3672 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3673 * [The lifetime bounds on `[T]::binary_search_by` and
3674 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3675 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3676 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3677 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3678 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3679 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3680 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3681 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3682 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3683 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3684 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3685 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3686 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3687 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3688 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3689 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3690 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3691 * [`mpsc::sync_channel` `Receiver`s return any available message before
3692 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3693 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3694 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3699 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3700 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3701 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3702 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3703 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3704 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3705 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3706 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3707 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3708 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3709 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3710 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3711 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3712 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3713 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3714 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3719 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3720 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3725 * [Test binaries now support a `--test-threads` argument to specify the number
3726 of threads used to run tests, and which acts the same as the
3727 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3728 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3729 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3730 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3731 * [Rust releases now come with source packages that can be installed by rustup
3732 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3733 The resulting source code can be used by tools and IDES, located in the
3734 sysroot under `lib/rustlib/src`.
3739 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3740 * Many minor improvements to the documentation.
3741 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3746 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3747 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3748 * [When formatting strings, if "precision" is specified, the "fill",
3749 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3750 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3753 Version 1.11.0 (2016-08-18)
3754 ===========================
3759 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3760 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3761 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3762 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3763 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3768 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3769 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3770 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3771 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3772 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3773 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3774 (in libcore - previously stabilized in libstd)
3775 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3776 (in libcore - previously stabilized in libstd)
3777 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3778 (in libcore - previously stabilized in libstd)
3779 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3780 (in libcore - previously stabilized in libstd)
3781 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3782 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3783 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3784 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3789 * [The `thread_local!` macro supports multiple definitions in a single
3790 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3791 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3792 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3793 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3794 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3795 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3796 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3797 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3802 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3803 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3804 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3805 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3806 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3807 and `-vv` prints warnings for all crates.
3808 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3809 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3810 This provides room for expansion by arbitrary tools.
3811 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3812 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3813 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3814 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3815 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3816 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3817 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3822 * [Caching projections speeds up type check dramatically for some
3823 workloads](https://github.com/rust-lang/rust/pull/33816)
3824 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3825 This hasher is faster, but is believed to provide sufficient
3826 protection from collision attacks.
3827 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3832 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3833 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3834 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3835 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3836 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3841 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3842 * [When emitting debug info, rustc emits frame pointers for closures,
3843 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3844 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3845 * Many more errors have been given error codes and extended
3847 * API documentation continues to be improved, with many new examples
3852 * [rustc no longer hangs when dependencies recursively re-export
3853 submodules](https://github.com/rust-lang/rust/pull/34542)
3854 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3855 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3856 rewritten](https://github.com/rust-lang/rust/pull/33895)
3857 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3858 No targets use this yet, but it works toward AVR support.
3863 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3864 * [The new follow-set rules that place restrictions on `macro_rules!`
3865 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3866 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3867 and has been a warning since 1.10.
3868 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3869 This causes breakage in some corner cases.
3872 Version 1.10.0 (2016-07-07)
3873 ===========================
3878 * [Allow `concat_idents!` in type positions as well as in expression
3879 positions](https://github.com/rust-lang/rust/pull/33735).
3880 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3881 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3882 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3883 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3884 * [`panic!` can be converted to a runtime abort with the
3885 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3886 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3887 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3888 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3889 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3890 Note that Cargo does not yet directly support cdylibs.
3895 * `os::windows::fs::OpenOptionsExt::access_mode`
3896 * `os::windows::fs::OpenOptionsExt::share_mode`
3897 * `os::windows::fs::OpenOptionsExt::custom_flags`
3898 * `os::windows::fs::OpenOptionsExt::attributes`
3899 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3900 * `os::unix::fs::OpenOptionsExt::custom_flags`
3901 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3902 * `Default for sync::Weak`
3903 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3904 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3905 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3906 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3907 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3908 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3909 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3910 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3911 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3912 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3913 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3914 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3915 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3916 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3917 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3918 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3919 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3920 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3921 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3922 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3923 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3924 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3925 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3926 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3927 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3928 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3929 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3930 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3931 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3932 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3933 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3934 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3935 * Read/Write/RawFd impls for `UnixStream`
3936 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3937 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3938 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3939 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3940 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3941 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3942 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3943 * RawFd impls for `UnixListener`
3944 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3945 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3946 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3947 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3948 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3949 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3950 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3951 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3952 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3953 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3954 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3955 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3956 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3957 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3958 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3959 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3960 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3961 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3962 * RawFd impls for `UnixDatagram`
3963 * `{BTree,Hash}Map::values_mut`
3964 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3969 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3970 The semantics of this minor method are subtle and probably not what
3972 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3973 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3974 will fall back to `/dev/urandom` temporarily to avoid blocking
3975 during early boot](https://github.com/rust-lang/rust/pull/33086).
3976 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3977 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3978 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3979 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3980 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3981 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3982 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3986 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3987 This controls the runtime behavior of the `panic!` macro
3988 and can be either "unwind" (the default), or "abort".
3989 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3990 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3991 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3992 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3993 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3994 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3995 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3996 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3997 By default they are retried twice, which can be customized with the
3998 `net.retry` value in `.cargo/config`.
3999 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
4000 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
4001 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
4002 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
4003 Makes it possible to install multiple crates in parallel.
4004 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
4005 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
4006 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
4007 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
4008 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
4009 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
4014 * [rustc memory usage was reduced by refactoring the context used for
4015 type checking](https://github.com/rust-lang/rust/pull/33425).
4016 * [Speed up creation of `HashMap`s by caching the random keys used
4017 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
4018 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
4019 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
4020 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
4021 10x faster than the previous lookup tables.
4022 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
4027 * Many incremental improvements to documentation and rustdoc.
4028 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
4029 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
4030 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
4031 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
4032 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
4033 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
4034 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
4039 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
4040 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
4041 * [`std` no longer prints backtraces on platforms where the running
4042 module must be loaded with `env::current_exe`, which can't be relied
4043 on](https://github.com/rust-lang/rust/pull/33554).
4044 * This release includes std binaries for the i586-unknown-linux-gnu,
4045 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
4046 i586 target is for old x86 hardware without SSE2, and the armv7
4047 target is for Android running on modern ARM architectures.
4048 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
4049 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
4050 * [On Unix the runtime aborts by calling `libc::abort` instead of
4051 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
4052 * [Rust is now bootstrapped from the previous release of Rust,
4053 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
4058 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
4059 * [`target_env` for Linux ARM targets is just `gnu`, not
4060 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
4061 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
4062 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
4063 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
4064 Affects how macros are parsed.
4065 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
4066 * [Feature-gated attributes on macro-generated macro invocations are
4067 now rejected](https://github.com/rust-lang/rust/pull/32791).
4068 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
4069 This caused some minor changes to type inference.
4072 Version 1.9.0 (2016-05-26)
4073 ==========================
4078 * The `#[deprecated]` attribute when applied to an API will generate
4079 warnings when used. The warnings may be suppressed with
4080 `#[allow(deprecated)]`. [RFC 1270].
4081 * [`fn` item types are zero sized, and each `fn` names a unique
4082 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4083 `transmute` on a `fn` type will generate a warning for a few cycles,
4084 then will be converted to an error.
4085 * [Field and method resolution understand visibility, so private
4086 fields and methods cannot prevent the proper use of public fields
4087 and methods][1.9fv].
4088 * [The parser considers unicode codepoints in the
4089 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
4095 * [`std::panic::catch_unwind`][] (renamed from `recover`)
4096 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
4097 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
4098 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
4099 * [`str::is_char_boundary`]
4100 * [`<*const T>::as_ref`]
4101 * [`<*mut T>::as_ref`]
4102 * [`<*mut T>::as_mut`]
4103 * [`AsciiExt::make_ascii_uppercase`]
4104 * [`AsciiExt::make_ascii_lowercase`]
4105 * [`char::decode_utf16`]
4106 * [`char::DecodeUtf16`]
4107 * [`char::DecodeUtf16Error`]
4108 * [`char::DecodeUtf16Error::unpaired_surrogate`]
4109 * [`BTreeSet::take`]
4110 * [`BTreeSet::replace`]
4113 * [`HashSet::replace`]
4115 * [`OsString::with_capacity`]
4116 * [`OsString::clear`]
4117 * [`OsString::capacity`]
4118 * [`OsString::reserve`]
4119 * [`OsString::reserve_exact`]
4120 * [`OsStr::is_empty`]
4122 * [`std::os::unix::thread`]
4125 * [`JoinHandleExt::as_pthread_t`]
4126 * [`JoinHandleExt::into_pthread_t`]
4127 * [`HashSet::hasher`]
4128 * [`HashMap::hasher`]
4129 * [`CommandExt::exec`]
4130 * [`File::try_clone`]
4131 * [`SocketAddr::set_ip`]
4132 * [`SocketAddr::set_port`]
4133 * [`SocketAddrV4::set_ip`]
4134 * [`SocketAddrV4::set_port`]
4135 * [`SocketAddrV6::set_ip`]
4136 * [`SocketAddrV6::set_port`]
4137 * [`SocketAddrV6::set_flowinfo`]
4138 * [`SocketAddrV6::set_scope_id`]
4139 * [`slice::copy_from_slice`]
4140 * [`ptr::read_volatile`]
4141 * [`ptr::write_volatile`]
4142 * [`OpenOptions::create_new`]
4143 * [`TcpStream::set_nodelay`]
4144 * [`TcpStream::nodelay`]
4145 * [`TcpStream::set_ttl`]
4146 * [`TcpStream::ttl`]
4147 * [`TcpStream::set_only_v6`]
4148 * [`TcpStream::only_v6`]
4149 * [`TcpStream::take_error`]
4150 * [`TcpStream::set_nonblocking`]
4151 * [`TcpListener::set_ttl`]
4152 * [`TcpListener::ttl`]
4153 * [`TcpListener::set_only_v6`]
4154 * [`TcpListener::only_v6`]
4155 * [`TcpListener::take_error`]
4156 * [`TcpListener::set_nonblocking`]
4157 * [`UdpSocket::set_broadcast`]
4158 * [`UdpSocket::broadcast`]
4159 * [`UdpSocket::set_multicast_loop_v4`]
4160 * [`UdpSocket::multicast_loop_v4`]
4161 * [`UdpSocket::set_multicast_ttl_v4`]
4162 * [`UdpSocket::multicast_ttl_v4`]
4163 * [`UdpSocket::set_multicast_loop_v6`]
4164 * [`UdpSocket::multicast_loop_v6`]
4165 * [`UdpSocket::set_multicast_ttl_v6`]
4166 * [`UdpSocket::multicast_ttl_v6`]
4167 * [`UdpSocket::set_ttl`]
4168 * [`UdpSocket::ttl`]
4169 * [`UdpSocket::set_only_v6`]
4170 * [`UdpSocket::only_v6`]
4171 * [`UdpSocket::join_multicast_v4`]
4172 * [`UdpSocket::join_multicast_v6`]
4173 * [`UdpSocket::leave_multicast_v4`]
4174 * [`UdpSocket::leave_multicast_v6`]
4175 * [`UdpSocket::take_error`]
4176 * [`UdpSocket::connect`]
4177 * [`UdpSocket::send`]
4178 * [`UdpSocket::recv`]
4179 * [`UdpSocket::set_nonblocking`]
4184 * [`std::sync::Once` is poisoned if its initialization function
4186 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4187 * [Most types implement `fmt::Debug`][1.9db].
4188 * [The default buffer size used by `BufReader` and `BufWriter` was
4189 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4190 used by other languages.
4191 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4192 `Duration` additionally implements `*=` and `/=`][1.9ta].
4193 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4194 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4195 * [`Chain` implements `BufRead`][1.9ch].
4196 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4201 * [Cargo can now run concurrently][1.9cc].
4202 * [Top-level overrides allow specific revisions of crates to be
4203 overridden through the entire crate graph][1.9ct]. This is intended
4204 to make upgrades easier for large projects, by allowing crates to be
4205 forked temporarily until they've been upgraded and republished.
4206 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4207 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4208 on the commandline][1.9cf]. `rustc` arguments can also be specified
4209 in the `build.rustflags` configuration key.
4214 * [The time complexity of comparing variables for equivalence during type
4215 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4216 to major compilation time improvement in some scenarios.
4217 * [`ToString` is specialized for `str`, giving it the same performance
4218 as `to_owned`][1.9ts].
4219 * [Spawning processes with `Command::output` no longer creates extra
4221 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4222 for C-like enums][1.9cl].
4227 * [Passing the `--quiet` flag to a test runner will produce
4228 much-abbreviated output][1.9q].
4229 * The Rust Project now publishes std binaries for the
4230 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4231 `i586-pc-windows-msvc` targets.
4236 * [`std::sync::Once` is poisoned if its initialization function
4238 * [It is illegal to define methods with the same name in overlapping
4239 inherent `impl` blocks][1.9sn].
4240 * [`fn` item types are zero sized, and each `fn` names a unique
4241 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4242 `transmute` on a `fn` type will generate a warning for a few cycles,
4243 then will be converted to an error.
4244 * [Improvements to const evaluation may trigger new errors when integer
4245 literals are out of range][1.9ce].
4248 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4249 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4250 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4251 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4252 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4253 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4254 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4255 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4256 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4257 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4258 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4259 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4260 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4261 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4262 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4263 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4264 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4265 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4266 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4267 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4268 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4269 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4270 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4271 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4272 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4273 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4274 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4275 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4276 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4277 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4278 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4279 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4280 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4281 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4282 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4283 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4284 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4285 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4286 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4287 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4288 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4289 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4290 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4291 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4292 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4293 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4294 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4295 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4296 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4297 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4298 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4299 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4300 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4301 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4302 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4303 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4304 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4305 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4306 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4307 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4308 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4309 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4310 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4311 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4312 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4313 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4314 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4315 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4316 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4317 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4318 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4319 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4320 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4321 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4322 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4323 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4324 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4325 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4326 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4327 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4328 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4329 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4330 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4331 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4332 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4333 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4334 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4335 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4336 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4337 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4338 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4339 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4340 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4341 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4342 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4343 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4344 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4345 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4346 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4347 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4348 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4349 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4350 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4351 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4352 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4353 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4354 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4355 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4356 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4357 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4360 Version 1.8.0 (2016-04-14)
4361 ==========================
4366 * Rust supports overloading of compound assignment statements like
4367 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4368 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4369 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4371 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4372 addition to the non-braced form, `struct Foo;`. [RFC 218].
4378 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4379 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4382 * [`ptr::drop_in_place`]
4384 * [`time::SystemTime`]
4386 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4387 * [`Instant::elapsed`]
4388 * [`SystemTime::now`]
4389 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4390 * [`SystemTime::elapsed`]
4391 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4392 * [`SystemTimeError`]
4393 * [`SystemTimeError::duration`]
4394 * Various impls for `SystemTimeError`
4396 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4397 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4398 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4399 * [The `write!` and `writeln!` macros correctly emit errors if any of
4400 their arguments can't be formatted][1.8w].
4401 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4402 * [The Unix-specific `raw` modules, which contain a number of
4403 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4404 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4405 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4406 across platforms was making it difficult to implement `std`
4407 correctly. Those that need these definitions should use the `libc`
4409 * The Unix-specific `MetadataExt` traits, including
4410 `os::unix::fs::MetadataExt`, which expose values such as inode
4411 numbers [no longer return platform-specific types][1.8r], but
4412 instead return widened integers. [RFC 1415].
4413 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4414 * [Atomic loads and stores are not volatile][1.8a].
4415 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4420 * [Inlining hash functions lead to a 3% compile-time improvement in
4421 some workloads][1.8h].
4422 * When using jemalloc, its symbols are [unprefixed so that it
4423 overrides the libc malloc implementation][1.8h]. This means that for
4424 rustc, LLVM is now using jemalloc, which results in a 6%
4425 compile-time improvement on a specific workload.
4426 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4431 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4432 i686-pc-windows-msvc is now considered a tier-1 platform.
4433 * [The `--print targets` flag prints a list of supported targets][1.8t].
4434 * [The `--print cfg` flag prints the `cfg`s defined for the current
4436 * [`rustc` can be built with an new Cargo-based build system, written
4437 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4438 build system. To enable it configure with `configure --rustbuild`.
4439 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4440 variants while also indicating the total number of missing variants
4441 if more than 3][1.8m].
4442 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4443 * The Rust Project now publishes binary releases of the standard
4444 library for a number of tier-2 targets:
4445 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4446 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4447 `x86_64-rumprun-netbsd`. These can be installed with
4448 tools such as [multirust][1.8mr].
4453 * [`cargo init` creates a new Cargo project in the current
4454 directory][1.8ci]. It is otherwise like `cargo new`.
4455 * [Cargo has configuration keys for `-v` and
4456 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4457 `[term]` section of `.cargo/config`.
4458 * [Configuration keys that evaluate to strings or integers can be set
4459 via environment variables][1.8ce]. For example the `build.jobs` key
4460 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4461 precedence over config files.
4462 * [Target-specific dependencies support Rust `cfg` syntax for
4463 describing targets][1.8cfg] so that dependencies for multiple
4464 targets can be specified together. [RFC 1361].
4465 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4466 `RUSTDOC` take precedence over the `build.target-dir`,
4467 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4468 * [The child process tree is killed on Windows when Cargo is
4470 * [The `build.target` configuration value sets the target platform,
4471 like `--target`][1.8ct].
4476 * [Unstable compiler flags have been further restricted][1.8u]. Since
4477 1.0 `-Z` flags have been considered unstable, and other flags that
4478 were considered unstable additionally required passing `-Z
4479 unstable-options` to access. Unlike unstable language and library
4480 features though, these options have been accessible on the stable
4481 release channel. Going forward, *new unstable flags will not be
4482 available on the stable release channel*, and old unstable flags
4483 will warn about their usage. In the future, all unstable flags will
4484 be unavailable on the stable release channel.
4485 * [It is no longer possible to `match` on empty enum variants using
4486 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4487 * The Unix-specific `MetadataExt` traits, including
4488 `os::unix::fs::MetadataExt`, which expose values such as inode
4489 numbers [no longer return platform-specific types][1.8r], but
4490 instead return widened integers. [RFC 1415].
4491 * [Modules sourced from the filesystem cannot appear within arbitrary
4492 blocks, but only within other modules][1.8mf].
4493 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4494 * On Unix, [stack overflow triggers a runtime abort instead of a
4496 * [`Command::spawn` and its equivalents return an error if any of
4497 its command-line arguments contain interior `NUL`s][1.8n].
4498 * [Tuple and unit enum variants from other crates are in the type
4500 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4501 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4502 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4503 instead of `foo.lib`.
4506 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4507 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4508 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4509 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4510 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4511 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4512 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4513 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4514 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4515 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4516 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4517 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4518 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4519 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4520 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4521 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4522 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4523 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4524 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4525 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4526 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4527 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4528 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4529 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4530 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4531 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4532 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4533 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4534 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4535 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4536 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4537 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4538 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4539 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4540 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4541 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4542 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4543 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4544 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4545 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4546 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4547 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4548 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4549 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4550 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4551 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4552 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4553 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4554 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4555 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4556 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4557 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4558 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4559 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4560 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4561 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4562 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4563 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4564 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4565 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4568 Version 1.7.0 (2016-03-03)
4569 ==========================
4576 * [`Path::strip_prefix`][] (renamed from relative_from)
4577 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4579 * [`Ipv4Addr::is_loopback`]
4580 * [`Ipv4Addr::is_private`]
4581 * [`Ipv4Addr::is_link_local`]
4582 * [`Ipv4Addr::is_multicast`]
4583 * [`Ipv4Addr::is_broadcast`]
4584 * [`Ipv4Addr::is_documentation`]
4586 * [`Ipv6Addr::is_unspecified`]
4587 * [`Ipv6Addr::is_loopback`]
4588 * [`Ipv6Addr::is_multicast`]
4591 * [`Vec::as_mut_slice`]
4593 * [`String::as_str`]
4594 * [`String::as_mut_str`]
4596 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4598 * `<[T]>::`[`sort_by_key`]
4599 * checked, saturated, and overflowing operations
4600 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4601 * [`i32::saturating_mul`]
4602 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4603 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4604 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4605 * [`u32::saturating_mul`]
4606 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4607 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4608 * and checked, saturated, and overflowing operations for other primitive types
4610 * [`ffi::IntoStringError`]
4611 * [`CString::into_string`]
4612 * [`CString::into_bytes`]
4613 * [`CString::into_bytes_with_nul`]
4614 * `From<CString> for Vec<u8>`
4616 * [`IntoStringError::into_cstring`]
4617 * [`IntoStringError::utf8_error`]
4618 * `Error for IntoStringError`
4620 * [`std::hash::BuildHasher`]
4621 * [`BuildHasher::Hasher`]
4622 * [`BuildHasher::build_hasher`]
4623 * [`std::hash::BuildHasherDefault`]
4624 * [`HashMap::with_hasher`]
4625 * [`HashMap::with_capacity_and_hasher`]
4626 * [`HashSet::with_hasher`]
4627 * [`HashSet::with_capacity_and_hasher`]
4628 * [`std::collections::hash_map::RandomState`]
4629 * [`RandomState::new`]
4630 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4631 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4632 from bytes is faster.
4633 * [The performance of `LineWriter` (and thus `io::stdout`) was
4634 improved by using `memchr` to search for newlines][1.7m].
4635 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4636 `f64` variants were stabilized previously.
4637 * [`BTreeMap` was rewritten to use less memory and improve the performance
4638 of insertion and iteration, the latter by as much as 5x][1.7bm].
4639 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4640 covariant over their contained type][1.7bt].
4641 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4642 over their contained type][1.7ll].
4643 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4645 * [`Any` is implemented for unsized types][1.7a].
4646 * [`Hash` is implemented for `Duration`][1.7h].
4651 * [When running tests with `--test`, rustdoc will pass `--cfg`
4652 arguments to the compiler][1.7dt].
4653 * [The compiler is built with RPATH information by default][1.7rpa].
4654 This means that it will be possible to run `rustc` when installed in
4655 unusual configurations without configuring the dynamic linker search
4657 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4658 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4659 over `LD_LIBRARY_PATH`.
4664 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4665 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4666 * [The `rerun-if-changed` build script directive no longer causes the
4667 build script to incorrectly run twice in certain scenarios][1.7rr].
4672 * Soundness fixes to the interactions between associated types and
4673 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4674 code that violates the new rules. This is a significant change that
4675 is known to break existing code, so it has emitted warnings for the
4676 new error cases since 1.4 to give crate authors time to adapt. The
4677 details of what is changing are subtle; read the RFC for more.
4678 * [Several bugs in the compiler's visibility calculations were
4679 fixed][1.7v]. Since this was found to break significant amounts of
4680 code, the new errors will be emitted as warnings for several release
4681 cycles, under the `private_in_public` lint.
4682 * Defaulted type parameters were accidentally accepted in positions
4683 that were not intended. In this release, [defaulted type parameters
4684 appearing outside of type definitions will generate a
4685 warning][1.7d], which will become an error in future releases.
4686 * [Parsing "." as a float results in an error instead of 0][1.7p].
4687 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4688 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4690 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4691 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4692 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4693 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4694 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4695 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4696 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4697 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4698 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4699 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4700 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4701 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4702 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4703 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4704 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4705 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4706 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4707 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4708 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4709 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4710 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4711 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4712 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4713 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4714 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4715 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4716 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4717 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4718 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4719 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4720 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4721 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4722 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4723 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4724 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4725 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4726 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4727 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4728 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4729 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4730 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4731 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4732 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4733 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4734 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4735 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4736 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4737 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4738 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4739 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4740 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4741 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4742 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4743 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4744 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4745 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4746 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4747 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4748 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4749 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4750 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4751 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4752 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4753 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4754 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4755 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4756 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4757 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4758 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4759 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4760 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4761 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4762 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4763 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4764 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4765 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4766 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4767 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4768 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4771 Version 1.6.0 (2016-01-21)
4772 ==========================
4777 * The `#![no_std]` attribute causes a crate to not be linked to the
4778 standard library, but only the [core library][1.6co], as described
4779 in [RFC 1184]. The core library defines common types and traits but
4780 has no platform dependencies whatsoever, and is the basis for Rust
4781 software in environments that cannot support a full port of the
4782 standard library, such as operating systems. Most of the core
4783 library is now stable.
4789 [`Read::read_exact`],
4790 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4791 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4792 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4793 [`os::unix::fs::DirBuilderExt`],
4794 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4795 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4796 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4797 [`collections::hash_map::Drain`],
4798 [`collections::hash_map::HashMap::drain`],
4799 [`collections::hash_set::Drain`],
4800 [`collections::hash_set::HashSet::drain`],
4801 [`collections::binary_heap::Drain`],
4802 [`collections::binary_heap::BinaryHeap::drain`],
4803 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4804 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4805 [`RwLock::into_inner`],
4806 [`Iterator::min_by_key`][] (renamed from `min_by`),
4807 [`Iterator::max_by_key`][] (renamed from `max_by`).
4808 * The [core library][1.6co] is stable, as are most of its APIs.
4809 * [The `assert_eq!` macro supports arguments that don't implement
4810 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4812 * Several timer functions that take duration in milliseconds [are
4813 deprecated in favor of those that take `Duration`][1.6ms]. These
4814 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4815 `thread::park_timeout_ms`.
4816 * The algorithm by which `Vec` reserves additional elements was
4817 [tweaked to not allocate excessive space][1.6a] while still growing
4819 * `From` conversions are [implemented from integers to floats][1.6f]
4820 in cases where the conversion is lossless. Thus they are not
4821 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4822 or `f64`. They are also not implemented for `isize` and `usize`
4823 because the implementations would be platform-specific. `From` is
4824 also implemented from `f32` to `f64`.
4825 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4826 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4827 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4828 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4830 * Sorting slices that are already sorted [is 50% faster in some
4836 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4837 * Cargo build scripts can specify their dependencies by emitting the
4838 [`rerun-if-changed`][1.6rr] key.
4839 * crates.io will reject publication of crates with dependencies that
4840 have a wildcard version constraint. Crates with wildcard
4841 dependencies were seen to cause a variety of problems, as described
4842 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4844 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4845 release folder. A variety of artifacts that Cargo failed to clean
4846 are now correctly deleted.
4851 * The `unreachable_code` lint [warns when a function call's argument
4853 * The parser indicates [failures that may be caused by
4854 confusingly-similar Unicode characters][1.6uc]
4855 * Certain macro errors [are reported at definition time][1.6m], not
4861 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4862 environment variable when locating crates. This was a pre-cargo
4863 feature for integrating with the package manager that was
4864 accidentally never removed.
4865 * [A number of bugs were fixed in the privacy checker][1.6p] that
4866 could cause previously-accepted code to break.
4867 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4868 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4869 struct pattern syntax (`Foo(..)`) can no longer be used to match
4870 unit structs. This is a warning now, but will become an error in
4871 future releases. Patterns that share the same name as a const are
4873 * A bug was fixed that causes [rustc not to apply default type
4874 parameters][1.6xc] when resolving certain method implementations of
4875 traits defined in other crates.
4877 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4878 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4879 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4880 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4881 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4882 [1.6co]: http://doc.rust-lang.org/core/index.html
4883 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4884 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4885 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4886 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4887 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4888 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4889 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4890 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4891 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4892 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4893 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4894 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4895 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4896 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4897 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4898 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4899 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4900 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4901 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4902 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4903 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4904 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4905 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4906 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4907 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4908 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4909 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4910 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4911 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4912 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4913 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4914 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4915 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4916 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4917 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4918 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4919 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4920 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4921 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4922 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4923 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4926 Version 1.5.0 (2015-12-10)
4927 ==========================
4929 * ~700 changes, numerous bugfixes
4935 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4936 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4937 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4938 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4939 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4940 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4941 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4942 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4943 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4944 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4945 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4946 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4947 [`Path::read_link`], [`Path::symlink_metadata`],
4948 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4949 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4950 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4951 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4952 [`slice::split_first_mut`], [`slice::split_first`],
4953 [`slice::split_last_mut`], [`slice::split_last`],
4954 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4955 [`str::MatchIndices`], [`str::RMatchIndices`],
4956 [`str::match_indices`], [`str::rmatch_indices`],
4957 [`str::slice_mut_unchecked`], [`string::ParseError`].
4958 * Rust applications hosted on crates.io can be installed locally to
4959 `~/.cargo/bin` with the [`cargo install`] command. Among other
4960 things this makes it easier to augment Cargo with new subcommands:
4961 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4962 invoked as `cargo foo`.
4963 * Crates with wildcard (`*`) dependencies will [emit warnings when
4964 published][1.5w]. In 1.6 it will no longer be possible to publish
4965 crates with wildcard dependencies.
4970 * The rules determining when a particular lifetime must outlive
4971 a particular value (known as '[dropck]') have been [modified
4972 to not rely on parametricity][1.5p].
4973 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4974 and `Arc`][1.5a]. Because these smart pointer types implement
4975 `Deref`, this causes breakage in cases where the interior type
4976 contains methods of the same name.
4977 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4978 that they could drop their content. Soundness fix.
4979 * All method invocations are [properly checked][1.5wf1] for
4980 [well-formedness][1.5wf2]. Soundness fix.
4981 * Traits whose supertraits contain `Self` are [not object
4982 safe][1.5o]. Soundness fix.
4983 * Target specifications support a [`no_default_libraries`][1.5nd]
4984 setting that controls whether `-nodefaultlibs` is passed to the
4985 linker, and in turn the `is_like_windows` setting no longer affects
4986 the `-nodefaultlibs` flag.
4987 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4988 * The `#[inline]` and `#[repr]` attributes [can only appear
4989 in valid locations][1.5at].
4990 * Native libraries linked from the local crate are [passed to
4991 the linker before native libraries from upstream crates][1.5nl].
4992 * Two rarely-used attributes, `#[no_debug]` and
4993 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4994 * Negation of unsigned integers, which has been a warning for
4995 several releases, [is now behind a feature gate and will
4996 generate errors][1.5nu].
4997 * The parser accidentally accepted visibility modifiers on
4998 enum variants, a bug [which has been fixed][1.5ev].
4999 * [A bug was fixed that allowed `use` statements to import unstable
5005 * When evaluating expressions at compile-time that are not
5006 compile-time constants (const-evaluating expressions in non-const
5007 contexts), incorrect code such as overlong bitshifts and arithmetic
5008 overflow will [generate a warning instead of an error][1.5ce],
5009 delaying the error until runtime. This will allow the
5010 const-evaluator to be expanded in the future backwards-compatibly.
5011 * The `improper_ctypes` lint [no longer warns about using `isize` and
5012 `usize` in FFI][1.5ict].
5017 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
5019 * `Default` is [implemented for mutable slices][1.5d].
5020 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
5021 * There are now `From` conversions [between floating point
5022 types][1.5f] where the conversions are lossless.
5023 * There are now `From` conversions [between integer types][1.5i] where
5024 the conversions are lossless.
5025 * [`fs::Metadata` implements `Clone`][1.5fs].
5026 * The `parse` method [accepts a leading "+" when parsing
5028 * [`AsMut` is implemented for `Vec`][1.5am].
5029 * The `clone_from` implementations for `String` and `BinaryHeap` [have
5030 been optimized][1.5cf] and no longer rely on the default impl.
5031 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
5032 `unsafe extern "C"` function types now [implement `Clone`,
5033 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
5034 `fmt::Debug` for up to 12 arguments][1.5fp].
5035 * [Dropping `Vec`s is much faster in unoptimized builds when the
5036 element types don't implement `Drop`][1.5dv].
5037 * A bug that caused in incorrect behavior when [combining `VecDeque`
5038 with zero-sized types][1.5vdz] was resolved.
5039 * [`PartialOrd` for slices is faster][1.5po].
5044 * [Crate metadata size was reduced by 20%][1.5md].
5045 * [Improvements to code generation reduced the size of libcore by 3.3
5046 MB and rustc's memory usage by 18MB][1.5m].
5047 * [Improvements to deref translation increased performance in
5048 unoptimized builds][1.5dr].
5049 * Various errors in trait resolution [are deduplicated to only be
5050 reported once][1.5te].
5051 * Rust has preliminary [support for rumprun kernels][1.5rr].
5052 * Rust has preliminary [support for NetBSD on amd64][1.5na].
5054 [1.5use]: https://github.com/rust-lang/rust/pull/28364
5055 [1.5po]: https://github.com/rust-lang/rust/pull/28436
5056 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
5057 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
5058 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
5059 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
5060 [1.5md]: https://github.com/rust-lang/rust/pull/28521
5061 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
5062 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
5063 [1.5na]: https://github.com/rust-lang/rust/pull/28543
5064 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
5065 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
5066 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
5067 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
5068 [1.5te]: https://github.com/rust-lang/rust/pull/28645
5069 [1.5at]: https://github.com/rust-lang/rust/pull/28650
5070 [1.5am]: https://github.com/rust-lang/rust/pull/28663
5071 [1.5m]: https://github.com/rust-lang/rust/pull/28778
5072 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
5073 [1.5a]: https://github.com/rust-lang/rust/pull/28811
5074 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
5075 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
5076 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
5077 [1.5i]: https://github.com/rust-lang/rust/pull/28921
5078 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
5079 [1.5f]: https://github.com/rust-lang/rust/pull/29129
5080 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
5081 [1.5s]: https://github.com/rust-lang/rust/pull/29190
5082 [1.5d]: https://github.com/rust-lang/rust/pull/29245
5083 [1.5o]: https://github.com/rust-lang/rust/pull/29259
5084 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
5085 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5086 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
5087 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
5088 [1.5c]: https://github.com/rust-lang/rust/pull/29110
5089 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5090 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
5091 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
5092 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
5093 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
5094 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
5095 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
5096 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
5097 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
5098 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
5099 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
5100 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
5101 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
5102 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
5103 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
5104 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
5105 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
5106 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
5107 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
5108 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
5109 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
5110 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
5111 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
5112 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
5113 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
5114 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
5115 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
5116 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
5117 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
5118 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
5119 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
5120 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
5121 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
5122 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
5123 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
5124 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
5125 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
5126 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
5127 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
5128 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
5129 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
5130 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
5131 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
5132 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
5133 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
5134 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
5135 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
5136 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
5137 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
5138 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
5139 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
5140 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
5141 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
5142 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
5144 Version 1.4.0 (2015-10-29)
5145 ==========================
5147 * ~1200 changes, numerous bugfixes
5152 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5153 GNU) are now supported and recommended for use.
5158 * [Several changes have been made to fix type soundness and improve
5159 the behavior of associated types][sound]. See [RFC 1214]. Although
5160 we have mostly introduced these changes as warnings this release, to
5161 become errors next release, there are still some scenarios that will
5162 see immediate breakage.
5163 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5164 line breaks in addition to `\n`][crlf].
5165 * [Loans of `'static` lifetime extend to the end of a function][stat].
5166 * [`str::parse` no longer introduces avoidable rounding error when
5167 parsing floating point numbers. Together with earlier changes to
5168 float formatting/output, "round trips" like f.to_string().parse()
5169 now preserve the value of f exactly. Additionally, leading plus
5170 signs are now accepted][fp3].
5176 * `use` statements that import multiple items [can now rename
5177 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5178 * [Binops work correctly on fat pointers][binfat].
5179 * `pub extern crate`, which does not behave as expected, [issues a
5180 warning][pec] until a better solution is found.
5185 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5186 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5187 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5188 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5189 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5190 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5191 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5192 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5193 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5194 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5195 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5196 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5197 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5198 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5199 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5200 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5201 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5202 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5204 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5205 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5206 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5207 `f64::from_str_radix`.
5208 * [Reverse-searching strings is faster with the 'two-way'
5210 * [`std::io::copy` allows `?Sized` arguments][cc].
5211 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5212 [override `count`, `nth` and `last` with an O(1)
5213 implementation][it].
5214 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5215 * [`IntoRawFd` has been added to the Unix-specific prelude,
5216 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5218 * [`Extend<String>` and `FromIterator<String` are both implemented for
5220 * [`IntoIterator` is implemented for references to `Option` and
5222 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5223 Copy`][ext] as part of [RFC 839]. This will cause type inference
5224 breakage in rare situations.
5225 * [`BinaryHeap` implements `Debug`][bh2].
5226 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5228 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5229 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5230 * [String comparison is faster][faststr].
5231 * `&mut T` where `T: std::fmt::Write` [also implements
5232 `std::fmt::Write`][mutw].
5233 * [A stable regression in `VecDeque::push_back` and other
5234 capacity-altering methods that caused panics for zero-sized types
5236 * [Function pointers implement traits for up to 12 parameters][fp2].
5241 * The compiler [no longer uses the 'morestack' feature to prevent
5242 stack overflow][mm]. Instead it uses guard pages and stack
5243 probes (though stack probes are not yet implemented on any platform
5245 * [The compiler matches traits faster when projections are involved][p].
5246 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5248 * [Cargo now displays useful information about what its doing during
5249 `cargo update`][cu].
5251 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5252 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5253 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5254 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5255 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5256 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5257 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5258 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5259 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5260 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5261 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5262 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5263 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5264 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5265 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5266 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5267 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5268 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5269 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5270 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5271 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5272 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5273 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5274 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5275 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5276 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5277 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5278 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5279 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5280 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5281 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5282 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5283 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5284 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5285 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5286 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5287 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5288 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5289 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5290 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5291 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5292 [bh2]: https://github.com/rust-lang/rust/pull/28156
5293 [binfat]: https://github.com/rust-lang/rust/pull/28270
5294 [bm]: https://github.com/rust-lang/rust/pull/28197
5295 [cc]: https://github.com/rust-lang/rust/pull/27531
5296 [crlf]: https://github.com/rust-lang/rust/pull/28034
5297 [cu]: https://github.com/rust-lang/cargo/pull/1931
5298 [d]: https://github.com/rust-lang/rust/pull/27825
5299 [dep]: https://github.com/rust-lang/rust/pull/28339
5300 [es]: https://github.com/rust-lang/rust/pull/27956
5301 [ext]: https://github.com/rust-lang/rust/pull/28094
5302 [faststr]: https://github.com/rust-lang/rust/pull/28338
5303 [ffi]: https://github.com/rust-lang/rust/pull/28779
5304 [fp]: https://github.com/rust-lang/rust/pull/28268
5305 [fp2]: https://github.com/rust-lang/rust/pull/28560
5306 [fp3]: https://github.com/rust-lang/rust/pull/27307
5307 [i]: https://github.com/rust-lang/rust/pull/27451
5308 [into2]: https://github.com/rust-lang/rust/pull/28039
5309 [it]: https://github.com/rust-lang/rust/pull/27652
5310 [mm]: https://github.com/rust-lang/rust/pull/27338
5311 [mutw]: https://github.com/rust-lang/rust/pull/28368
5312 [sound]: https://github.com/rust-lang/rust/pull/27641
5313 [p]: https://github.com/rust-lang/rust/pull/27866
5314 [pec]: https://github.com/rust-lang/rust/pull/28486
5315 [pr]: https://github.com/rust-lang/rust/pull/27896
5316 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5317 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5318 [s]: https://github.com/rust-lang/rust/pull/27474
5319 [stab]: https://github.com/rust-lang/rust/pull/28339
5320 [stat]: https://github.com/rust-lang/rust/pull/28321
5321 [vd]: https://github.com/rust-lang/rust/pull/28494
5323 Version 1.3.0 (2015-09-17)
5324 ==============================
5326 * ~900 changes, numerous bugfixes
5331 * The [new object lifetime defaults][nold] have been [turned
5332 on][nold2] after a cycle of warnings about the change. Now types
5333 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5334 being interpreted as `&'a Box<Trait+'a>` to `&'a
5335 Box<Trait+'static>`.
5336 * [The Rustonomicon][nom] is a new book in the official documentation
5337 that dives into writing unsafe Rust.
5338 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5339 timekeeping is employed by other std APIs, as well as out-of-tree
5345 * The [new object lifetime defaults][nold] have been [turned
5346 on][nold2] after a cycle of warnings about the change.
5347 * There is a known [regression][lr] in how object lifetime elision is
5348 interpreted, the proper solution for which is undetermined.
5349 * The `#[prelude_import]` attribute, an internal implementation
5350 detail, was accidentally stabilized previously. [It has been put
5351 behind the `prelude_import` feature gate][pi]. This change is
5352 believed to break no existing code.
5353 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5354 [more sane for dynamically sized types][dst3]. Code that relied on
5355 the previous behavior is thought to be broken.
5356 * The `dropck` rules, which checks that destructors can't access
5357 destroyed values, [have been updated][dropck] to match the
5358 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5359 cause some previously-compiling code to no longer build.
5364 * The [new object lifetime defaults][nold] have been [turned
5365 on][nold2] after a cycle of warnings about the change.
5366 * Semicolons may [now follow types and paths in
5367 macros](https://github.com/rust-lang/rust/pull/27000).
5368 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5369 [more sane for dynamically sized types][dst3]. Code that relied on
5370 the previous behavior is not known to exist, and suspected to be
5372 * `'static` variables [may now be recursive][st].
5373 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5374 implementations correctly.
5375 * The `dropck` rules, which checks that destructors can't access
5376 destroyed values, [have been updated][dropck] to match the
5382 * The [`Duration`] API, [has been stabilized][ds], as well as the
5383 `std::time` module, which presently contains only `Duration`.
5384 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5385 * The owned C string, [`CString`], implements [`Borrow`] and the
5386 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5387 these allow C strings to be borrowed and cloned in generic code.
5388 * [`CStr`] implements [`Debug`].
5389 * [`AtomicPtr`] implements [`Debug`].
5390 * [`Error`] trait objects [can be downcast to their concrete types][e]
5391 in many common configurations, using the [`is`], [`downcast`],
5392 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5394 * Searching for substrings now [employs the two-way algorithm][search]
5395 instead of doing a naive search. This gives major speedups to a
5396 number of methods, including [`contains`][sc], [`find`][sf],
5397 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5398 [`ends_with`][sew] are also faster.
5399 * The performance of `PartialEq` for slices is [much faster][ps].
5400 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5401 is overridden and optimized by the implementations for scalars.
5402 * The [`Hasher`] trait now has a number of specialized `write_*`
5403 methods for primitive types, for efficiency.
5404 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5405 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5406 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5407 of [`std::error::Error::cause`][iec] also delegates to the inner
5409 * [`process::Child`][pc] gained the [`id`] method, which returns a
5410 `u32` representing the platform-specific process identifier.
5411 * The [`connect`] method on slices is deprecated, replaced by the new
5412 [`join`] method (note that both of these are on the *unstable*
5413 [`SliceConcatExt`] trait, but through the magic of the prelude are
5414 available to stable code anyway).
5415 * The [`Div`] operator is implemented for [`Wrapping`] types.
5416 * [`DerefMut` is implemented for `String`][dms].
5417 * Performance of SipHash (the default hasher for `HashMap`) is
5418 [better for long data][sh].
5419 * [`AtomicPtr`] implements [`Send`].
5420 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5421 are now [specialized to use uninitialized buffers for increased
5423 * Lifetime parameters of foreign functions [are now resolved
5429 * Rust can now, with some coercion, [produce programs that run on
5430 Windows XP][xp], though XP is not considered a supported platform.
5431 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5432 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5433 recommended for use in 1.3, though should be fully-functional
5434 in the [64-bit 1.4 beta][b14].
5435 * On Fedora-based systems installation will [properly configure the
5436 dynamic linker][fl].
5437 * The compiler gained many new extended error descriptions, which can
5438 be accessed with the `--explain` flag.
5439 * The `dropck` pass, which checks that destructors can't access
5440 destroyed values, [has been rewritten][dropck]. This fixes some
5441 soundness holes, and as such will cause some previously-compiling
5442 code to no longer build.
5443 * `rustc` now uses [LLVM to write archive files where possible][ar].
5444 Eventually this will eliminate the compiler's dependency on the ar
5446 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5447 supported FreeBSD on x86_64).
5448 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5449 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5451 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5452 will kill the process instead of leaking][nlp].
5454 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5455 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5456 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5457 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5458 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5459 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5460 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5461 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5462 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5463 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5464 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5465 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5466 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5467 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5468 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5469 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5470 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5471 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5472 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5473 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5474 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5475 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5476 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5477 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5478 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5479 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5480 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5481 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5482 [ar]: https://github.com/rust-lang/rust/pull/26926
5483 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5484 [dms]: https://github.com/rust-lang/rust/pull/26241
5485 [dropck]: https://github.com/rust-lang/rust/pull/27261
5486 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5487 [ds]: https://github.com/rust-lang/rust/pull/26818
5488 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5489 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5490 [dst3]: https://github.com/rust-lang/rust/pull/27351
5491 [e]: https://github.com/rust-lang/rust/pull/24793
5492 [f]: https://github.com/rust-lang/rust/pull/26588
5493 [fb]: https://github.com/rust-lang/rust/pull/26959
5494 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5495 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5496 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5497 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5498 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5499 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5500 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5501 [lic]: https://github.com/rust-lang/rust/pull/26583
5502 [lnu]: https://github.com/rust-lang/rust/pull/27026
5503 [lr]: https://github.com/rust-lang/rust/issues/27248
5504 [lum]: https://github.com/rust-lang/rust/pull/26378
5505 [lur]: https://github.com/rust-lang/rust/pull/26783
5506 [nlp]: https://github.com/rust-lang/rust/pull/27176
5507 [nold2]: https://github.com/rust-lang/rust/pull/27045
5508 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5509 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5510 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5511 [pi]: https://github.com/rust-lang/rust/pull/26699
5512 [ps]: https://github.com/rust-lang/rust/pull/26884
5513 [rte]: https://github.com/rust-lang/rust/pull/26950
5514 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5515 [search]: https://github.com/rust-lang/rust/pull/26327
5516 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5517 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5518 [sh]: https://github.com/rust-lang/rust/pull/27280
5519 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5520 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5521 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5522 [st]: https://github.com/rust-lang/rust/pull/26630
5523 [win1]: https://github.com/rust-lang/rust/pull/26569
5524 [win2]: https://github.com/rust-lang/rust/pull/26741
5525 [win3]: https://github.com/rust-lang/rust/pull/26741
5526 [win4]: https://github.com/rust-lang/rust/pull/27210
5527 [xp]: https://github.com/rust-lang/rust/pull/26569
5529 Version 1.2.0 (2015-08-07)
5530 ==========================
5532 * ~1200 changes, numerous bugfixes
5537 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5538 like `Rc` to contain types without a fixed size, arrays and trait
5539 objects, finally enabling use of `Rc<[T]>` and completing the
5540 implementation of DST.
5541 * [Parallel codegen][parcodegen] is now working again, which can
5542 substantially speed up large builds in debug mode; It also gets
5543 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5544 jobs). It's not enabled by default, but will be "in the near
5545 future". It can be activated with the `-C codegen-units=N` flag to
5547 * This is the first release with [experimental support for linking
5548 with the MSVC linker and lib C on Windows (instead of using the GNU
5549 variants via MinGW)][win]. It is yet recommended only for the most
5550 intrepid Rustaceans.
5551 * Benchmark compilations are showing a 30% improvement in
5552 bootstrapping over 1.1.
5557 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5558 unicode case mapping, which is a previously-planned change in
5559 behavior and considered a bugfix.
5560 * [`mem::align_of`] now specifies [the *minimum alignment* for
5561 T][align], which is usually the alignment programs are interested
5562 in, and the same value reported by clang's
5563 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5565 * [The `#[packed]` attribute is no longer silently accepted by the
5566 compiler][packed]. This attribute did nothing and code that
5567 mentioned it likely did not work as intended.
5568 * Associated type defaults are [now behind the
5569 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5570 defaults *did not work*, but could be mentioned syntactically. As
5571 such this breakage has minimal impact.
5576 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5577 matching against dereferenceable values.
5582 * The [`Extend`] trait, which grows a collection from an iterator, is
5583 implemented over iterators of references, for `String`, `Vec`,
5584 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5585 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5586 * The [`iter::once`] function returns an iterator that yields a single
5587 element, and [`iter::empty`] returns an iterator that yields no
5589 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5590 over substring matches.
5591 * [`Cell`] and [`RefCell`] both implement `Eq`.
5592 * A number of methods for wrapping arithmetic are added to the
5593 integral types, [`wrapping_div`], [`wrapping_rem`],
5594 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5595 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5596 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5597 type.. It is illegal for the default arithmetic operations in Rust
5598 to overflow; the desire to wrap must be explicit.
5599 * The `{:#?}` formatting specifier [displays the alternate,
5600 pretty-printed][debugfmt] form of the `Debug` formatter. This
5601 feature was actually introduced prior to 1.0 with little
5603 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5604 for writing data to formatted strings, similar to [`io::Write`].
5605 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5606 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5607 are used by code generators to emit implementations of [`Debug`].
5608 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5609 methods that convert case, following Unicode case mapping.
5610 * It is now easier to handle poisoned locks. The [`PoisonError`]
5611 type, returned by failing lock operations, exposes `into_inner`,
5612 `get_ref`, and `get_mut`, which all give access to the inner lock
5613 guard, and allow the poisoned lock to continue to operate. The
5614 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5615 poisoned lock without attempting to take the lock.
5616 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5617 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5618 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5619 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5621 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5627 * `rustc` employs smarter heuristics for guessing at [typos].
5628 * `rustc` emits more efficient code for [no-op conversions between
5629 unsafe pointers][nop].
5630 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5631 resulting in faster compile times and smaller code.
5633 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5634 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5635 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5636 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5637 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5638 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5639 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5640 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5641 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5642 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5643 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5644 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5645 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5646 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5647 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5648 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5649 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5650 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5651 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5652 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5653 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5654 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5655 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5656 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5657 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5658 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5659 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5660 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5661 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5662 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5663 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5664 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5665 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5666 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5667 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5668 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5669 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5670 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5671 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5672 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5673 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5674 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5675 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5676 [align]: https://github.com/rust-lang/rust/pull/25646
5677 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5678 [typos]: https://github.com/rust-lang/rust/pull/26087
5679 [nop]: https://github.com/rust-lang/rust/pull/26336
5680 [fat]: https://github.com/rust-lang/rust/pull/26411
5681 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5682 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5683 [packed]: https://github.com/rust-lang/rust/pull/25541
5684 [ad]: https://github.com/rust-lang/rust/pull/27382
5685 [win]: https://github.com/rust-lang/rust/pull/25350
5687 Version 1.1.0 (2015-06-25)
5688 =========================
5690 * ~850 changes, numerous bugfixes
5695 * The [`std::fs` module has been expanded][fs] to expand the set of
5696 functionality exposed:
5697 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5698 don't incur a syscall on some platforms.
5699 * A `symlink_metadata` function has been added.
5700 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5701 access to all underlying information.
5702 * The compiler now contains extended explanations of many errors. When an error
5703 with an explanation occurs the compiler suggests using the `--explain` flag
5704 to read the explanation. Error explanations are also [available online][err-index].
5705 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5706 well as other work, the time to bootstrap the compiler decreased by
5712 * The [`str::split_whitespace`] method splits a string on unicode
5713 whitespace boundaries.
5714 * On both Windows and Unix, new extension traits provide conversion of
5715 I/O types to and from the underlying system handles. On Unix, these
5716 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5717 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5718 `TcpListener`, and `UpdSocket`. Further implementations for
5719 `std::process` will be stabilized later.
5720 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5721 Windows, symlinks can be created with
5722 `std::os::windows::symlink_dir` and
5723 `std::os::windows::symlink_file`.
5724 * The `mpsc::Receiver` type can now be converted into an iterator with
5725 `into_iter` on the [`IntoIterator`] trait.
5726 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5727 implementation of the [`From`] trait.
5728 * The `Debug` implementation for `RangeFull` [creates output that is
5729 more consistent with other implementations][rf].
5730 * [`Debug` is implemented for `File`][file].
5731 * The `Default` implementation for `Arc` [no longer requires `Sync +
5733 * [The `Iterator` methods `count`, `nth`, and `last` have been
5734 overridden for slices to have O(1) performance instead of O(n)][si].
5735 * Incorrect handling of paths on Windows has been improved in both the
5736 compiler and the standard library.
5737 * [`AtomicPtr` gained a `Default` implementation][ap].
5738 * In accordance with Rust's policy on arithmetic overflow `abs` now
5739 [panics on overflow when debug assertions are enabled][abs].
5740 * The [`Cloned`] iterator, which was accidentally left unstable for
5741 1.0 [has been stabilized][c].
5742 * The [`Incoming`] iterator, which iterates over incoming TCP
5743 connections, and which was accidentally unnamable in 1.0, [is now
5744 properly exported][inc].
5745 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5746 `sift_up` or `sift_down` panic][bh].
5747 * The [`split_off`] method of `LinkedList` [no longer corrupts
5748 the list in certain scenarios][ll].
5753 * Type checking performance [has improved notably][sk] with
5754 [multiple improvements][pre].
5755 * The compiler [suggests code changes][ch] for more errors.
5756 * rustc and it's build system have experimental support for [building
5757 toolchains against MUSL][m] instead of glibc on Linux.
5758 * The compiler defines the `target_env` cfg value, which is used for
5759 distinguishing toolchains that are otherwise for the same
5760 platform. Presently this is set to `gnu` for common GNU Linux
5761 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5762 * The [`cargo rustc`][crc] command invokes a build with custom flags
5764 * [Android executables are always position independent][pie].
5765 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5768 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5769 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5770 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5771 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5772 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5773 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5774 [rf]: https://github.com/rust-lang/rust/pull/24491
5775 [err-index]: https://doc.rust-lang.org/error-index.html
5776 [sk]: https://github.com/rust-lang/rust/pull/24615
5777 [pre]: https://github.com/rust-lang/rust/pull/25323
5778 [file]: https://github.com/rust-lang/rust/pull/24598
5779 [ch]: https://github.com/rust-lang/rust/pull/24683
5780 [arc]: https://github.com/rust-lang/rust/pull/24695
5781 [si]: https://github.com/rust-lang/rust/pull/24701
5782 [ap]: https://github.com/rust-lang/rust/pull/24834
5783 [m]: https://github.com/rust-lang/rust/pull/24777
5784 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5785 [crc]: https://github.com/rust-lang/cargo/pull/1568
5786 [pie]: https://github.com/rust-lang/rust/pull/24953
5787 [abs]: https://github.com/rust-lang/rust/pull/25441
5788 [c]: https://github.com/rust-lang/rust/pull/25496
5789 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5790 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5791 [inc]: https://github.com/rust-lang/rust/pull/25522
5792 [bh]: https://github.com/rust-lang/rust/pull/25856
5793 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5794 [ll]: https://github.com/rust-lang/rust/pull/26022
5795 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5796 [drop]: https://github.com/rust-lang/rust/pull/24935
5798 Version 1.0.0 (2015-05-15)
5799 ========================
5801 * ~1500 changes, numerous bugfixes
5806 * The vast majority of the standard library is now `#[stable]`. It is
5807 no longer possible to use unstable features with a stable build of
5809 * Many popular crates on [crates.io] now work on the stable release
5811 * Arithmetic on basic integer types now [checks for overflow in debug
5817 * Several [restrictions have been added to trait coherence][coh] in
5818 order to make it easier for upstream authors to change traits
5819 without breaking downstream code.
5820 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5821 improve error messages and macro behavior. For example, `0b1234` is
5822 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5823 * Trait bounds [are always invariant][inv], eliminating the need for
5824 the `PhantomFn` and `MarkerTrait` lang items, which have been
5826 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5827 "foo" as bar` syntax has been replaced with `extern crate foo as
5828 bar`, and Cargo now automatically translates "-" in *package* names
5829 to underscore for the crate name.
5830 * [Lifetime shadowing is an error][lt].
5831 * [`Send` no longer implies `'static`][send-rfc].
5832 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5833 `MyType::default()`.
5834 * Primitive types [now have inherent methods][prim-inherent],
5835 obviating the need for extension traits like `SliceExt`.
5836 * Methods with `Self: Sized` in their `where` clause are [considered
5837 object-safe][self-sized], allowing many extension traits like
5838 `IteratorExt` to be merged into the traits they extended.
5839 * You can now [refer to associated types][assoc-where] whose
5840 corresponding trait bounds appear only in a `where` clause.
5841 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5842 like `Send` and `Sync` are now library-defined.
5843 * A [Reflect trait][reflect] was introduced, which means that
5844 downcasting via the `Any` trait is effectively limited to concrete
5845 types. This helps retain the potentially-important "parametricity"
5846 property: generic code cannot behave differently for different type
5847 arguments except in minor ways.
5848 * The `unsafe_destructor` feature is now deprecated in favor of the
5849 [new `dropck`][dropck]. This change is a major reduction in unsafe
5855 * The `thread_local` module [has been renamed to `std::thread`][th].
5856 * The methods of `IteratorExt` [have been moved to the `Iterator`
5858 * Several traits that implement Rust's conventions for type
5859 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5860 [centralized in the `std::convert` module][con].
5861 * The `FromError` trait [was removed in favor of `From`][fe].
5862 * The basic sleep function [has moved to
5863 `std::thread::sleep_ms`][slp].
5864 * The `splitn` function now takes an `n` parameter that represents the
5865 number of items yielded by the returned iterator [instead of the
5866 number of 'splits'][spl].
5867 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5868 * [Derived implementations of `PartialOrd` now order enums according
5869 to their explicitly-assigned discriminants][po].
5870 * [Methods for searching strings are generic over `Pattern`s][pat],
5871 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5873 * [In method resolution, object methods are resolved before inherent
5875 * [`String::from_str` has been deprecated in favor of the `From` impl,
5876 `String::from`][sf].
5877 * [`io::Error` implements `Sync`][ios].
5878 * [The `words` method on `&str` has been replaced with
5879 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5881 * The new path and IO modules are complete and `#[stable]`. This
5882 was the major library focus for this cycle.
5883 * The path API was [revised][path-normalize] to normalize `.`,
5884 adjusting the tradeoffs in favor of the most common usage.
5885 * A large number of remaining APIs in `std` were also stabilized
5886 during this cycle; about 75% of the non-deprecated API surface
5888 * The new [string pattern API][string-pattern] landed, which makes
5889 the string slice API much more internally consistent and flexible.
5890 * A new set of [generic conversion traits][conversion] replaced
5891 many existing ad hoc traits.
5892 * Generic numeric traits were [completely removed][num-traits]. This
5893 was made possible thanks to inherent methods for primitive types,
5894 and the removal gives maximal flexibility for designing a numeric
5895 hierarchy in the future.
5896 * The `Fn` traits are now related via [inheritance][fn-inherit]
5897 and provide ergonomic [blanket implementations][fn-blanket].
5898 * The `Index` and `IndexMut` traits were changed to
5899 [take the index by value][index-value], enabling code like
5900 `hash_map["string"]` to work.
5901 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5902 `Copy` data is known to be `Clone` as well.
5907 * Many errors now have extended explanations that can be accessed with
5908 the `--explain` flag to `rustc`.
5909 * Many new examples have been added to the standard library
5911 * rustdoc has received a number of improvements focused on completion
5913 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5914 * Much headway was made on ecosystem-wide CI, making it possible
5915 to [compare builds for breakage][ci-compare].
5918 [crates.io]: http://crates.io
5919 [clo]: https://github.com/rust-lang/rust/pull/24034
5920 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5921 [con]: https://github.com/rust-lang/rust/pull/23875
5922 [cr]: https://github.com/rust-lang/rust/pull/23419
5923 [fe]: https://github.com/rust-lang/rust/pull/23879
5924 [ie]: https://github.com/rust-lang/rust/pull/23300
5925 [inv]: https://github.com/rust-lang/rust/pull/23938
5926 [ios]: https://github.com/rust-lang/rust/pull/24133
5927 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5928 [lt]: https://github.com/rust-lang/rust/pull/24057
5929 [meth]: https://github.com/rust-lang/rust/pull/24056
5930 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5931 [po]: https://github.com/rust-lang/rust/pull/24270
5932 [sf]: https://github.com/rust-lang/rust/pull/24517
5933 [slp]: https://github.com/rust-lang/rust/pull/23949
5934 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5935 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5936 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5937 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5938 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5939 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5940 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5941 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5942 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5943 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5944 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5945 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5946 [reflect]: https://github.com/rust-lang/rust/pull/23712
5947 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5948 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5949 [index-value]: https://github.com/rust-lang/rust/pull/23601
5950 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5951 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5952 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5953 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5954 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5955 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5958 Version 1.0.0-alpha.2 (2015-02-20)
5959 =====================================
5961 * ~1300 changes, numerous bugfixes
5965 * The various I/O modules were [overhauled][io-rfc] to reduce
5966 unnecessary abstractions and provide better interoperation with
5967 the underlying platform. The old `io` module remains temporarily
5969 * The standard library now [participates in feature gating][feat],
5970 so use of unstable libraries now requires a `#![feature(...)]`
5971 attribute. The impact of this change is [described on the
5972 forum][feat-forum]. [RFC][feat-rfc].
5976 * `for` loops [now operate on the `IntoIterator` trait][into],
5977 which eliminates the need to call `.iter()`, etc. to iterate
5978 over collections. There are some new subtleties to remember
5979 though regarding what sort of iterators various types yield, in
5980 particular that `for foo in bar { }` yields values from a move
5981 iterator, destroying the original collection. [RFC][into-rfc].
5982 * Objects now have [default lifetime bounds][obj], so you don't
5983 have to write `Box<Trait+'static>` when you don't care about
5984 storing references. [RFC][obj-rfc].
5985 * In types that implement `Drop`, [lifetimes must outlive the
5986 value][drop]. This will soon make it possible to safely
5987 implement `Drop` for types where `#[unsafe_destructor]` is now
5988 required. Read the [gorgeous RFC][drop-rfc] for details.
5989 * The fully qualified <T as Trait>::X syntax lets you set the Self
5990 type for a trait method or associated type. [RFC][ufcs-rfc].
5991 * References to types that implement `Deref<U>` now [automatically
5992 coerce to references][deref] to the dereferenced type `U`,
5993 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5994 should eliminate many unsightly uses of `&*`, as when converting
5995 from references to vectors into references to
5996 slices. [RFC][deref-rfc].
5997 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5998 `|:|`) is obsolete and closure kind is inferred from context.
5999 * [`Self` is a keyword][Self].
6003 * The `Show` and `String` formatting traits [have been
6004 renamed][fmt] to `Debug` and `Display` to more clearly reflect
6005 their related purposes. Automatically getting a string
6006 conversion to use with `format!("{:?}", something_to_debug)` is
6007 now written `#[derive(Debug)]`.
6008 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
6009 OsStr}`, provide strings in platform-specific encodings for easier
6010 interop with system APIs. [RFC][osstr-rfc].
6011 * The `boxed::into_raw` and `Box::from_raw` functions [convert
6012 between `Box<T>` and `*mut T`][boxraw], a common pattern for
6013 creating raw pointers.
6017 * Certain long error messages of the form 'expected foo found bar'
6018 are now [split neatly across multiple
6019 lines][multiline]. Examples in the PR.
6020 * On Unix Rust can be [uninstalled][un] by running
6021 `/usr/local/lib/rustlib/uninstall.sh`.
6022 * The `#[rustc_on_unimplemented]` attribute, requiring the
6023 'on_unimplemented' feature, lets rustc [display custom error
6024 messages when a trait is expected to be implemented for a type
6029 * Rust is tested against a [LALR grammar][lalr], which parses
6030 almost all the Rust files that rustc does.
6032 [boxraw]: https://github.com/rust-lang/rust/pull/21318
6033 [close]: https://github.com/rust-lang/rust/pull/21843
6034 [deref]: https://github.com/rust-lang/rust/pull/21351
6035 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
6036 [drop]: https://github.com/rust-lang/rust/pull/21972
6037 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6038 [feat]: https://github.com/rust-lang/rust/pull/21248
6039 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
6040 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
6041 [fmt]: https://github.com/rust-lang/rust/pull/21457
6042 [into]: https://github.com/rust-lang/rust/pull/20790
6043 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
6044 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6045 [lalr]: https://github.com/rust-lang/rust/pull/21452
6046 [multiline]: https://github.com/rust-lang/rust/pull/19870
6047 [obj]: https://github.com/rust-lang/rust/pull/22230
6048 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
6049 [onun]: https://github.com/rust-lang/rust/pull/20889
6050 [osstr]: https://github.com/rust-lang/rust/pull/21488
6051 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6052 [Self]: https://github.com/rust-lang/rust/pull/22158
6053 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
6054 [un]: https://github.com/rust-lang/rust/pull/22256
6057 Version 1.0.0-alpha (2015-01-09)
6058 ==================================
6060 * ~2400 changes, numerous bugfixes
6064 * The language itself is considered feature complete for 1.0,
6065 though there will be many usability improvements and bugfixes
6066 before the final release.
6067 * Nearly 50% of the public API surface of the standard library has
6068 been declared 'stable'. Those interfaces are unlikely to change
6070 * The long-running debate over integer types has been
6071 [settled][ints]: Rust will ship with types named `isize` and
6072 `usize`, rather than `int` and `uint`, for pointer-sized
6073 integers. Guidelines will be rolled out during the alpha cycle.
6074 * Most crates that are not `std` have been moved out of the Rust
6075 distribution into the Cargo ecosystem so they can evolve
6076 separately and don't need to be stabilized as quickly, including
6077 'time', 'getopts', 'num', 'regex', and 'term'.
6078 * Documentation continues to be expanded with more API coverage, more
6079 examples, and more in-depth explanations. The guides have been
6080 consolidated into [The Rust Programming Language][trpl].
6081 * "[Rust By Example][rbe]" is now maintained by the Rust team.
6082 * All official Rust binary installers now come with [Cargo], the
6083 Rust package manager.
6087 * Closures have been [completely redesigned][unboxed] to be
6088 implemented in terms of traits, can now be used as generic type
6089 bounds and thus monomorphized and inlined, or via an opaque
6090 pointer (boxed) as in the old system. The new system is often
6091 referred to as 'unboxed' closures.
6092 * Traits now support [associated types][assoc], allowing families
6093 of related types to be defined together and used generically in
6095 * Enum variants are [namespaced by their type names][enum].
6096 * [`where` clauses][where] provide a more versatile and attractive
6097 syntax for specifying generic bounds, though the previous syntax
6099 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
6101 * Rust [no longer has a runtime][rt] of any description, and only
6102 supports OS threads, not green threads.
6103 * At long last, Rust has been overhauled for 'dynamically-sized
6104 types' ([DST]), which integrates 'fat pointers' (object types,
6105 arrays, and `str`) more deeply into the type system, making it
6107 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
6108 `..j` that produce range types and which, when combined with the
6109 `Index` operator and multidispatch, leads to a convenient slice
6111 * The new range syntax revealed an ambiguity in the fixed-length
6112 array syntax, so now fixed length arrays [are written `[T;
6114 * The `Copy` trait is no longer implemented automatically. Unsafe
6115 pointers no longer implement `Sync` and `Send` so types
6116 containing them don't automatically either. `Sync` and `Send`
6117 are now 'unsafe traits' so one can "forcibly" implement them via
6118 `unsafe impl` if a type confirms to the requirements for them
6119 even though the internals do not (e.g. structs containing unsafe
6120 pointers like `Arc`). These changes are intended to prevent some
6121 footguns and are collectively known as [opt-in built-in
6122 traits][oibit] (though `Sync` and `Send` will soon become pure
6123 library types unknown to the compiler).
6124 * Operator traits now take their operands [by value][ops], and
6125 comparison traits can use multidispatch to compare one type
6126 against multiple other types, allowing e.g. `String` to be
6127 compared with `&str`.
6128 * `if let` and `while let` are no longer feature-gated.
6129 * Rust has adopted a more [uniform syntax for escaping unicode
6130 characters][unicode].
6131 * `macro_rules!` [has been declared stable][mac]. Though it is a
6132 flawed system it is sufficiently popular that it must be usable
6133 for 1.0. Effort has gone into [future-proofing][mac-future] it
6134 in ways that will allow other macro systems to be developed in
6135 parallel, and won't otherwise impact the evolution of the
6137 * The prelude has been [pared back significantly][prelude] such
6138 that it is the minimum necessary to support the most pervasive
6139 code patterns, and through [generalized where clauses][where]
6140 many of the prelude extension traits have been consolidated.
6141 * Rust's rudimentary reflection [has been removed][refl], as it
6142 incurred too much code generation for little benefit.
6143 * [Struct variants][structvars] are no longer feature-gated.
6144 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
6145 known as 'higher-ranked trait bounds', this crucially allows
6146 unboxed closures to work.
6147 * Macros invocations surrounded by parens or square brackets and
6148 not terminated by a semicolon are [parsed as
6149 expressions][macros], which makes expressions like `vec![1i32,
6150 2, 3].len()` work as expected.
6151 * Trait objects now implement their traits automatically, and
6152 traits that can be coerced to objects now must be [object
6154 * Automatically deriving traits is now done with `#[derive(...)]`
6155 not `#[deriving(...)]` for [consistency with other naming
6156 conventions][derive].
6157 * Importing the containing module or enum at the same time as
6158 items or variants they contain is [now done with `self` instead
6159 of `mod`][self], as in use `foo::{self, bar}`
6160 * Glob imports are no longer feature-gated.
6161 * The `box` operator and `box` patterns have been feature-gated
6162 pending a redesign. For now unique boxes should be allocated
6163 like other containers, with `Box::new`.
6167 * A [series][coll1] of [efforts][coll2] to establish
6168 [conventions][coll3] for collections types has resulted in API
6169 improvements throughout the standard library.
6170 * New [APIs for error handling][err] provide ergonomic interop
6171 between error types, and [new conventions][err-conv] describe
6172 more clearly the recommended error handling strategies in Rust.
6173 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6174 it is easier to discuss failure in the context of error handling
6175 without making clarifications as to whether you are referring to
6176 the 'fail' macro or failure more generally.
6177 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6178 syscall when available.
6179 * The 'serialize' crate has been renamed 'rustc-serialize' and
6180 moved out of the distribution to Cargo. Although it is widely
6181 used now, it is expected to be superseded in the near future.
6182 * The `Show` formatter, typically implemented with
6183 `#[derive(Show)]` is [now requested with the `{:?}`
6184 specifier][show] and is intended for use by all types, for uses
6185 such as `println!` debugging. The new `String` formatter must be
6186 implemented by hand, uses the `{}` specifier, and is intended
6187 for full-fidelity conversions of things that can logically be
6188 represented as strings.
6192 * [Flexible target specification][flex] allows rustc's code
6193 generation to be configured to support otherwise-unsupported
6195 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6196 respective debuggers with Rust-appropriate pretty-printing.
6197 * The Windows installation of Rust is distributed with the
6198 MinGW components currently required to link binaries on that
6203 * Nullable enum optimizations have been extended to more types so
6204 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6205 space than the inner types themselves.
6206 * Work has begun on supporting AArch64.
6208 [Cargo]: https://crates.io
6209 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6210 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6211 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6212 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6213 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6214 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6215 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6216 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6217 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6218 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6219 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6220 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6221 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6222 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6223 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6224 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6225 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6226 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6227 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6228 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6229 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6230 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6231 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6232 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6233 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6234 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6235 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6236 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6237 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6238 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6239 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6240 [trpl]: https://doc.rust-lang.org/book/index.html
6241 [rbe]: http://rustbyexample.com/
6244 Version 0.12.0 (2014-10-09)
6245 =============================
6247 * ~1900 changes, numerous bugfixes
6251 * The introductory documentation (now called The Rust Guide) has
6252 been completely rewritten, as have a number of supplementary
6254 * Rust's package manager, Cargo, continues to improve and is
6255 sometimes considered to be quite awesome.
6256 * Many API's in `std` have been reviewed and updated for
6257 consistency with the in-development Rust coding
6258 guidelines. The standard library documentation tracks
6259 stabilization progress.
6260 * Minor libraries have been moved out-of-tree to the rust-lang org
6261 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6262 be installed with Cargo.
6263 * Lifetime elision allows lifetime annotations to be left off of
6264 function declarations in many common scenarios.
6265 * Rust now works on 64-bit Windows.
6268 * Indexing can be overloaded with the `Index` and `IndexMut`
6270 * The `if let` construct takes a branch only if the `let` pattern
6271 matches, currently behind the 'if_let' feature gate.
6272 * 'where clauses', a more flexible syntax for specifying trait
6273 bounds that is more aesthetic, have been added for traits and
6274 free functions. Where clauses will in the future make it
6275 possible to constrain associated types, which would be
6276 impossible with the existing syntax.
6277 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6278 the 'slicing_syntax' feature gate, and can be overloaded with
6279 the `Slice` or `SliceMut` traits.
6280 * The syntax for matching of sub-slices has been changed to use a
6281 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6282 consistency with other uses of `..` and to future-proof
6283 potential additional uses of the syntax.
6284 * The syntax for matching inclusive ranges in patterns has changed
6285 from `0..3` to `0...4` to be consistent with the exclusive range
6287 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6288 c]`) has been put behind the 'advanced_slice_patterns' feature
6289 gate and may be removed in the future.
6290 * Components of tuples and tuple structs can be extracted using
6291 the `value.0` syntax, currently behind the `tuple_indexing`
6293 * The `#[crate_id]` attribute is no longer supported; versioning
6294 is handled by the package manager.
6295 * Renaming crate imports are now written `extern crate foo as bar`
6296 instead of `extern crate bar = foo`.
6297 * Renaming use statements are now written `use foo as bar` instead
6299 * `let` and `match` bindings and argument names in macros are now
6301 * The new, more efficient, closure types ('unboxed closures') have
6302 been added under a feature gate, 'unboxed_closures'. These will
6303 soon replace the existing closure types, once higher-ranked
6304 trait lifetimes are added to the language.
6305 * `move` has been added as a keyword, for indicating closures
6306 that capture by value.
6307 * Mutation and assignment is no longer allowed in pattern guards.
6308 * Generic structs and enums can now have trait bounds.
6309 * The `Share` trait is now called `Sync` to free up the term
6310 'shared' to refer to 'shared reference' (the default reference
6312 * Dynamically-sized types have been mostly implemented,
6313 unifying the behavior of fat-pointer types with the rest of the
6315 * As part of dynamically-sized types, the `Sized` trait has been
6316 introduced, which qualifying types implement by default, and
6317 which type parameters expect by default. To specify that a type
6318 parameter does not need to be sized, write `<Sized? T>`. Most
6319 types are `Sized`, notable exceptions being unsized arrays
6320 (`[T]`) and trait types.
6321 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6322 * Lifetime bounds can now be applied to type parameters and object
6324 * The old, reference counted GC type, `Gc<T>` which was once
6325 denoted by the `@` sigil, has finally been removed. GC will be
6326 revisited in the future.
6329 * Library documentation has been improved for a number of modules.
6330 * Bit-vectors, collections::bitv has been modernized.
6331 * The url crate is deprecated in favor of
6332 http://github.com/servo/rust-url, which can be installed with
6334 * Most I/O stream types can be cloned and subsequently closed from
6336 * A `std::time::Duration` type has been added for use in I/O
6337 methods that rely on timers, as well as in the 'time' crate's
6338 `Timespec` arithmetic.
6339 * The runtime I/O abstraction layer that enabled the green thread
6340 scheduler to do non-thread-blocking I/O has been removed, along
6341 with the libuv-based implementation employed by the green thread
6342 scheduler. This will greatly simplify the future I/O work.
6343 * `collections::btree` has been rewritten to have a more
6344 idiomatic and efficient design.
6347 * rustdoc output now indicates the stability levels of API's.
6348 * The `--crate-name` flag can specify the name of the crate
6349 being compiled, like `#[crate_name]`.
6350 * The `-C metadata` specifies additional metadata to hash into
6351 symbol names, and `-C extra-filename` specifies additional
6352 information to put into the output filename, for use by the
6353 package manager for versioning.
6354 * debug info generation has continued to improve and should be
6355 more reliable under both gdb and lldb.
6356 * rustc has experimental support for compiling in parallel
6357 using the `-C codegen-units` flag.
6358 * rustc no longer encodes rpath information into binaries by
6362 * Stack usage has been optimized with LLVM lifetime annotations.
6363 * Official Rust binaries on Linux are more compatible with older
6364 kernels and distributions, built on CentOS 5.10.
6367 Version 0.11.0 (2014-07-02)
6368 ==========================
6370 * ~1700 changes, numerous bugfixes
6373 * ~[T] has been removed from the language. This type is superseded by
6375 * ~str has been removed from the language. This type is superseded by
6377 * ~T has been removed from the language. This type is superseded by the
6379 * @T has been removed from the language. This type is superseded by the
6380 standard library's std::gc::Gc<T> type.
6381 * Struct fields are now all private by default.
6382 * Vector indices and shift amounts are both required to be a `uint`
6383 instead of any integral type.
6384 * Byte character, byte string, and raw byte string literals are now all
6385 supported by prefixing the normal literal with a `b`.
6386 * Multiple ABIs are no longer allowed in an ABI string
6387 * The syntax for lifetimes on closures/procedures has been tweaked
6388 slightly: `<'a>|A, B|: 'b + K -> T`
6389 * Floating point modulus has been removed from the language; however it
6390 is still provided by a library implementation.
6391 * Private enum variants are now disallowed.
6392 * The `priv` keyword has been removed from the language.
6393 * A closure can no longer be invoked through a &-pointer.
6394 * The `use foo, bar, baz;` syntax has been removed from the language.
6395 * The transmute intrinsic no longer works on type parameters.
6396 * Statics now allow blocks/items in their definition.
6397 * Trait bounds are separated from objects with + instead of : now.
6398 * Objects can no longer be read while they are mutably borrowed.
6399 * The address of a static is now marked as insignificant unless the
6400 #[inline(never)] attribute is placed it.
6401 * The #[unsafe_destructor] attribute is now behind a feature gate.
6402 * Struct literals are no longer allowed in ambiguous positions such as
6403 if, while, match, and for..in.
6404 * Declaration of lang items and intrinsics are now feature-gated by
6406 * Integral literals no longer default to `int`, and floating point
6407 literals no longer default to `f64`. Literals must be suffixed with an
6408 appropriate type if inference cannot determine the type of the
6410 * The Box<T> type is no longer implicitly borrowed to &mut T.
6411 * Procedures are now required to not capture borrowed references.
6414 * The standard library is now a "facade" over a number of underlying
6415 libraries. This means that development on the standard library should
6416 be speedier due to smaller crates, as well as a clearer line between
6418 * A new library, libcore, lives under the standard library's facade
6419 which is Rust's "0-assumption" library, suitable for embedded and
6420 kernel development for example.
6421 * A regex crate has been added to the standard distribution. This crate
6422 includes statically compiled regular expressions.
6423 * The unwrap/unwrap_err methods on Result require a Show bound for
6424 better error messages.
6425 * The return types of the std::comm primitives have been centralized
6426 around the Result type.
6427 * A number of I/O primitives have gained the ability to time out their
6429 * A number of I/O primitives have gained the ability to close their
6430 reading/writing halves to cancel pending operations.
6431 * Reverse iterator methods have been removed in favor of `rev()` on
6432 their forward-iteration counterparts.
6433 * A bitflags! macro has been added to enable easy interop with C and
6434 management of bit flags.
6435 * A debug_assert! macro is now provided which is disabled when
6436 `--cfg ndebug` is passed to the compiler.
6437 * A graphviz crate has been added for creating .dot files.
6438 * The std::cast module has been migrated into std::mem.
6439 * The std::local_data api has been migrated from freestanding functions
6440 to being based on methods.
6441 * The Pod trait has been renamed to Copy.
6442 * jemalloc has been added as the default allocator for types.
6443 * The API for allocating memory has been changed to use proper alignment
6444 and sized deallocation
6445 * Connecting a TcpStream or binding a TcpListener is now based on a
6446 string address and a u16 port. This allows connecting to a hostname as
6448 * The Reader trait now contains a core method, read_at_least(), which
6449 correctly handles many repeated 0-length reads.
6450 * The process-spawning API is now centered around a builder-style
6452 * The :? printing qualifier has been moved from the standard library to
6453 an external libdebug crate.
6454 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6455 have been renamed to Eq/Ord.
6456 * The select/plural methods have been removed from format!. The escapes
6457 for { and } have also changed from \{ and \} to {{ and }},
6459 * The TaskBuilder API has been re-worked to be a true builder, and
6460 extension traits for spawning native/green tasks have been added.
6463 * All breaking changes to the language or libraries now have their
6464 commit message annotated with `[breaking-change]` to allow for easy
6465 discovery of breaking changes.
6466 * The compiler will now try to suggest how to annotate lifetimes if a
6467 lifetime-related error occurs.
6468 * Debug info continues to be improved greatly with general bug fixes and
6469 better support for situations like link time optimization (LTO).
6470 * Usage of syntax extensions when cross-compiling has been fixed.
6471 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6472 -fdata-sections and --gc-sections has been enabled by default
6473 * The compiler is now stricter about where it will load module files
6474 from when a module is declared via `mod foo;`.
6475 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6476 Syntax extensions are now discovered via a "plugin registrar" type
6477 which will be extended in the future to other various plugins.
6478 * Lints have been restructured to allow for dynamically loadable lints.
6479 * A number of rustdoc improvements:
6480 * The HTML output has been visually redesigned.
6481 * Markdown is now powered by hoedown instead of sundown.
6482 * Searching heuristics have been greatly improved.
6483 * The search index has been reduced in size by a great amount.
6484 * Cross-crate documentation via `pub use` has been greatly improved.
6485 * Primitive types are now hyperlinked and documented.
6486 * Documentation has been moved from static.rust-lang.org/doc to
6488 * A new sandbox, play.rust-lang.org, is available for running and
6489 sharing rust code examples on-line.
6490 * Unused attributes are now more robustly warned about.
6491 * The dead_code lint now warns about unused struct fields.
6492 * Cross-compiling to iOS is now supported.
6493 * Cross-compiling to mipsel is now supported.
6494 * Stability attributes are now inherited by default and no longer apply
6495 to intra-crate usage, only inter-crate usage.
6496 * Error message related to non-exhaustive match expressions have been
6500 Version 0.10 (2014-04-03)
6501 =========================
6503 * ~1500 changes, numerous bugfixes
6506 * A new RFC process is now in place for modifying the language.
6507 * Patterns with `@`-pointers have been removed from the language.
6508 * Patterns with unique vectors (`~[T]`) have been removed from the
6510 * Patterns with unique strings (`~str`) have been removed from the
6512 * `@str` has been removed from the language.
6513 * `@[T]` has been removed from the language.
6514 * `@self` has been removed from the language.
6515 * `@Trait` has been removed from the language.
6516 * Headers on `~` allocations which contain `@` boxes inside the type for
6517 reference counting have been removed.
6518 * The semantics around the lifetimes of temporary expressions have changed,
6519 see #3511 and #11585 for more information.
6520 * Cross-crate syntax extensions are now possible, but feature gated. See
6521 #11151 for more information. This includes both `macro_rules!` macros as
6522 well as syntax extensions such as `format!`.
6523 * New lint modes have been added, and older ones have been turned on to be
6525 * Unnecessary parentheses
6528 * Uppercase variables
6529 * Publicly visible private types
6530 * `#[deriving]` with raw pointers
6531 * Unsafe functions can no longer be coerced to closures.
6532 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6533 * The `#[simd]` attribute is now behind a feature gate.
6534 * Visibility is no longer allowed on `extern crate` statements, and
6535 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6536 * Trailing commas are now allowed in argument lists and tuple patterns.
6537 * The `do` keyword has been removed, it is now a reserved keyword.
6538 * Default type parameters have been implemented, but are feature gated.
6539 * Borrowed variables through captures in closures are now considered soundly.
6540 * `extern mod` is now `extern crate`
6541 * The `Freeze` trait has been removed.
6542 * The `Share` trait has been added for types that can be shared among
6544 * Labels in macros are now hygienic.
6545 * Expression/statement macro invocations can be delimited with `{}` now.
6546 * Treatment of types allowed in `static mut` locations has been tweaked.
6547 * The `*` and `.` operators are now overloadable through the `Deref` and
6549 * `~Trait` and `proc` no longer have `Send` bounds by default.
6550 * Partial type hints are now supported with the `_` type marker.
6551 * An `Unsafe` type was introduced for interior mutability. It is now
6552 considered undefined to transmute from `&T` to `&mut T` without using the
6554 * The #[linkage] attribute was implemented for extern statics/functions.
6555 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6556 * `Pod` was renamed to `Copy`.
6559 * The `libextra` library has been removed. It has now been decomposed into
6560 component libraries with smaller and more focused nuggets of
6561 functionality. The full list of libraries can be found on the
6562 documentation index page.
6563 * std: `std::condition` has been removed. All I/O errors are now propagated
6564 through the `Result` type. In order to assist with error handling, a
6565 `try!` macro for unwrapping errors with an early return and a lint for
6566 unused results has been added. See #12039 for more information.
6567 * std: The `vec` module has been renamed to `slice`.
6568 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6569 This will become the only growable vector in the future.
6570 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6571 are now found at `std::io::BufferedReader` instead of
6572 `std::io::buffered::BufferedReader`.
6573 * std: `print` and `println` are no longer in the prelude, the `print!` and
6574 `println!` macros are intended to be used instead.
6575 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6576 attempts to statically prevent cycles.
6577 * std: The standard distribution is adopting the policy of pushing failure
6578 to the user rather than failing in libraries. Many functions (such as
6579 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6580 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6581 deriving mode: `#[deriving(Show)]`.
6582 * std: `ToStr` is now implemented for all types implementing `Show`.
6583 * std: The formatting trait methods now take `&self` instead of `&T`
6584 * std: The `invert()` method on iterators has been renamed to `rev()`
6585 * std: `std::num` has seen a reduction in the genericity of its traits,
6586 consolidating functionality into a few core traits.
6587 * std: Backtraces are now printed on task failure if the environment
6588 variable `RUST_BACKTRACE` is present.
6589 * std: Naming conventions for iterators have been standardized. More details
6590 can be found on the wiki's style guide.
6591 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6592 still implement the function.
6593 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6594 * std: `assert_approx_eq!` has been removed
6595 * std: The `e` and `E` formatting specifiers for floats have been added to
6596 print them in exponential notation.
6597 * std: The `Times` trait has been removed
6598 * std: Indications of variance and opting out of builtin bounds is done
6599 through marker types in `std::kinds::marker` now
6600 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6601 `#[deriving(Hash)]` is now possible.
6602 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6603 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6604 * std: `Chan::new` is now `channel()`.
6605 * std: A new synchronous channel type has been implemented.
6606 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6607 * std: `hashmap` and `trie` have been moved to `libcollections`
6608 * std: `run` has been rolled into `io::process`
6609 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6610 * std: The equality and comparison traits have seen some reorganization.
6611 * std: `rand` has moved to `librand`.
6612 * std: `to_{lower,upper}case` has been implemented for `char`.
6613 * std: Logging has been moved to `liblog`.
6614 * collections: `HashMap` has been rewritten for higher performance and less
6616 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6617 it can be booted manually. The runtime guide has more information and
6619 * native: All I/O functionality except signals has been implemented.
6620 * green: Task spawning with `libgreen` has been optimized with stack caching
6621 and various trimming of code.
6622 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6623 * sync: The `extra::sync` module has been updated to modern rust (and moved
6624 to the `sync` library), tweaking and improving various interfaces while
6625 dropping redundant functionality.
6626 * sync: A new `Barrier` type has been added to the `sync` library.
6627 * sync: An efficient mutex for native and green tasks has been implemented.
6628 * serialize: The `base64` module has seen some improvement. It treats
6629 newlines better, has non-string error values, and has seen general
6631 * fourcc: A `fourcc!` macro was introduced
6632 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6633 hexadecimal literal.
6636 * `rustpkg` has been deprecated and removed from the main repository. Its
6637 replacement, `cargo`, is under development.
6638 * Nightly builds of rust are now available
6639 * The memory usage of rustc has been improved many times throughout this
6641 * The build process supports disabling rpath support for the rustc binary
6643 * Code generation has improved in some cases, giving more information to the
6644 LLVM optimization passes to enable more extensive optimizations.
6645 * Debuginfo compatibility with lldb on OSX has been restored.
6646 * The master branch is now gated on an android bot, making building for
6647 android much more reliable.
6648 * Output flags have been centralized into one `--emit` flag.
6649 * Crate type flags have been centralized into one `--crate-type` flag.
6650 * Codegen flags have been consolidated behind a `-C` flag.
6651 * Linking against outdated crates now has improved error messages.
6652 * Error messages with lifetimes will often suggest how to annotate the
6653 function to fix the error.
6654 * Many more types are documented in the standard library, and new guides
6656 * Many `rustdoc` improvements:
6657 * code blocks are syntax highlighted.
6658 * render standalone markdown files.
6659 * the --test flag tests all code blocks by default.
6660 * exported macros are displayed.
6661 * re-exported types have their documentation inlined at the location of the
6663 * search works across crates that have been rendered to the same output
6667 Version 0.9 (2014-01-09)
6668 ==========================
6670 * ~1800 changes, numerous bugfixes
6673 * The `float` type has been removed. Use `f32` or `f64` instead.
6674 * A new facility for enabling experimental features (feature gating) has
6675 been added, using the crate-level `#[feature(foo)]` attribute.
6676 * Managed boxes (@) are now behind a feature gate
6677 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6678 standard library's `Gc` or `Rc` types instead.
6679 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6680 * Jumping back to the top of a loop is now done with `continue` instead of
6682 * Strings can no longer be mutated through index assignment.
6683 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6684 hash delimiters, as in `r###"foo"###`.
6685 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6687 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6688 * `@fn`s have been removed.
6689 * `do` only works with procs in order to make it obvious what the cost
6691 * Single-element tuple-like structs can no longer be dereferenced to
6692 obtain the inner value. A more comprehensive solution for overloading
6693 the dereference operator will be provided in the future.
6694 * The `#[link(...)]` attribute has been replaced with
6695 `#[crate_id = "name#vers"]`.
6696 * Empty `impl`s must be terminated with empty braces and may not be
6697 terminated with a semicolon.
6698 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6699 no longer has any special meaning.
6700 * The old `fmt!` string formatting macro has been removed.
6701 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6702 `print!` and `println!`.
6703 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6704 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6705 `extern mod foo = "bar"` instead.
6706 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6707 * Macros can have attributes.
6708 * Macros can expand to items with attributes.
6709 * Macros can expand to multiple items.
6710 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6711 * Comments may be nested.
6712 * Values automatically coerce to trait objects they implement, without
6714 * Enum discriminants are no longer an entire word but as small as needed to
6715 contain all the variants. The `repr` attribute can be used to override
6716 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6717 `#[repr(C)]` to match C enums.
6718 * Non-string literals are not allowed in attributes (they never worked).
6719 * The FFI now supports variadic functions.
6720 * Octal numeric literals, as in `0o7777`.
6721 * The `concat!` syntax extension performs compile-time string concatenation.
6722 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6723 removed as Rust no longer uses segmented stacks.
6724 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6725 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6726 not `*`; ignoring remaining fields of a struct is also done with `..`,
6727 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6728 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6729 * `rustc` supports the "system" calling convention, which defaults to the
6730 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6732 * The `type_overflow` lint (default: warn) checks literals for overflow.
6733 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6734 * The `attribute_usage` lint (default: warn) warns about unknown
6736 * The `unknown_features` lint (default: warn) warns about unknown
6738 * The `dead_code` lint (default: warn) checks for dead code.
6739 * Rust libraries can be linked statically to one another
6740 * `#[link_args]` is behind the `link_args` feature gate.
6741 * Native libraries are now linked with `#[link(name = "foo")]`
6742 * Native libraries can be statically linked to a rust crate
6743 (`#[link(name = "foo", kind = "static")]`).
6744 * Native OS X frameworks are now officially supported
6745 (`#[link(name = "foo", kind = "framework")]`).
6746 * The `#[thread_local]` attribute creates thread-local (not task-local)
6747 variables. Currently behind the `thread_local` feature gate.
6748 * The `return` keyword may be used in closures.
6749 * Types that can be copied via a memcpy implement the `Pod` kind.
6750 * The `cfg` attribute can now be used on struct fields and enum variants.
6753 * std: The `option` and `result` API's have been overhauled to make them
6754 simpler, more consistent, and more composable.
6755 * std: The entire `std::io` module has been replaced with one that is
6756 more comprehensive and that properly interfaces with the underlying
6757 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6759 * std: `io::util` contains a number of useful implementations of
6760 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6761 `ZeroReader`, `TeeReader`.
6762 * std: The reference counted pointer type `extra::rc` moved into std.
6763 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6764 just a wrapper around it).
6765 * std: The `Either` type has been removed.
6766 * std: `fmt::Default` can be implemented for any type to provide default
6767 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6768 * std: The `rand` API continues to be tweaked.
6769 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6770 on failure in gdb, is now named `rust_fail`.
6771 * std: The `each_key` and `each_value` methods on `HashMap` have been
6772 replaced by the `keys` and `values` iterators.
6773 * std: Functions dealing with type size and alignment have moved from the
6774 `sys` module to the `mem` module.
6775 * std: The `path` module was written and API changed.
6776 * std: `str::from_utf8` has been changed to cast instead of allocate.
6777 * std: `starts_with` and `ends_with` methods added to vectors via the
6778 `ImmutableEqVector` trait, which is in the prelude.
6779 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6780 if the index is out of bounds.
6781 * std: Task failure no longer propagates between tasks, as the model was
6782 complex, expensive, and incompatible with thread-based tasks.
6783 * std: The `Any` type can be used for dynamic typing.
6784 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6786 * std: Methods that produce iterators generally do not have an `_iter`
6788 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6789 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6790 * std: `util::ignore` renamed to `prelude::drop`.
6791 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6793 * std: `vec::raw` has seen a lot of cleanup and API changes.
6794 * std: The standard library no longer includes any C++ code, and very
6795 minimal C, eliminating the dependency on libstdc++.
6796 * std: Runtime scheduling and I/O functionality has been factored out into
6797 extensible interfaces and is now implemented by two different crates:
6798 libnative, for native threading and I/O; and libgreen, for green threading
6799 and I/O. This paves the way for using the standard library in more limited
6800 embedded environments.
6801 * std: The `comm` module has been rewritten to be much faster, have a
6802 simpler, more consistent API, and to work for both native and green
6804 * std: All libuv dependencies have been moved into the rustuv crate.
6805 * native: New implementations of runtime scheduling on top of OS threads.
6806 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6808 * green: The green thread scheduler and message passing types are almost
6810 * extra: The `flatpipes` module had bitrotted and was removed.
6811 * extra: All crypto functions have been removed and Rust now has a policy of
6812 not reimplementing crypto in the standard library. In the future crypto
6813 will be provided by external crates with bindings to established libraries.
6814 * extra: `c_vec` has been modernized.
6815 * extra: The `sort` module has been removed. Use the `sort` method on
6819 * The `rust` and `rusti` commands have been removed, due to lack of
6821 * `rustdoc` was completely rewritten.
6822 * `rustdoc` can test code examples in documentation.
6823 * `rustpkg` can test packages with the argument, 'test'.
6824 * `rustpkg` supports arbitrary dependencies, including C libraries.
6825 * `rustc`'s support for generating debug info is improved again.
6826 * `rustc` has better error reporting for unbalanced delimiters.
6827 * `rustc`'s JIT support was removed due to bitrot.
6828 * Executables and static libraries can be built with LTO (-Z lto)
6829 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6833 Version 0.8 (2013-09-26)
6834 ============================
6836 * ~2200 changes, numerous bugfixes
6839 * The `for` loop syntax has changed to work with the `Iterator` trait.
6840 * At long last, unwinding works on Windows.
6841 * Default methods are ready for use.
6842 * Many trait inheritance bugs fixed.
6843 * Owned and borrowed trait objects work more reliably.
6844 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6845 * rustc can omit emission of code for the `debug!` macro if it is passed
6847 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6848 for foo.rs, then foo/mod.rs, and will generate an error when both are
6850 * Strings no longer contain trailing nulls. The new `std::c_str` module
6851 provides new mechanisms for converting to C strings.
6852 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6853 * The FFI has been overhauled such that foreign functions are called directly,
6854 instead of through a stack-switching wrapper.
6855 * Calling a foreign function must be done through a Rust function with the
6856 `#[fixed_stack_segment]` attribute.
6857 * The `externfn!` macro can be used to declare both a foreign function and
6858 a `#[fixed_stack_segment]` wrapper at once.
6859 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6860 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6861 * `priv` is disallowed everywhere except for struct fields and enum variants.
6862 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6863 * `ref` bindings in irrefutable patterns work correctly now.
6864 * `char` is now prevented from containing invalid code points.
6865 * Casting to `bool` is no longer allowed.
6866 * `\0` is now accepted as an escape in chars and strings.
6867 * `yield` is a reserved keyword.
6868 * `typeof` is a reserved keyword.
6869 * Crates may be imported by URL with `extern mod foo = "url";`.
6870 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6871 * Static vectors can be initialized with repeating elements,
6872 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6873 * Static structs can be initialized with functional record update,
6874 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6875 * `cfg!` can be used to conditionally execute code based on the crate
6876 configuration, similarly to `#[cfg(...)]`.
6877 * The `unnecessary_qualification` lint detects unneeded module
6878 prefixes (default: allow).
6879 * Arithmetic operations have been implemented on the SIMD types in
6880 `std::unstable::simd`.
6881 * Exchange allocation headers were removed, reducing memory usage.
6882 * `format!` implements a completely new, extensible, and higher-performance
6883 string formatting system. It will replace `fmt!`.
6884 * `print!` and `println!` write formatted strings (using the `format!`
6885 extension) to stdout.
6886 * `write!` and `writeln!` write formatted strings (using the `format!`
6887 extension) to the new Writers in `std::rt::io`.
6888 * The library section in which a function or static is placed may
6889 be specified with `#[link_section = "..."]`.
6890 * The `proto!` syntax extension for defining bounded message protocols
6892 * `macro_rules!` is hygienic for `let` declarations.
6893 * The `#[export_name]` attribute specifies the name of a symbol.
6894 * `unreachable!` can be used to indicate unreachable code, and fails
6898 * std: Transitioned to the new runtime, written in Rust.
6899 * std: Added an experimental I/O library, `rt::io`, based on the new
6901 * std: A new generic `range` function was added to the prelude, replacing
6902 `uint::range` and friends.
6903 * std: `range_rev` no longer exists. Since range is an iterator it can be
6904 reversed with `range(lo, hi).invert()`.
6905 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6906 renamed to `unwrap_or`.
6907 * std: The `iterator` module was renamed to `iter`.
6908 * std: Integral types now support the `checked_add`, `checked_sub`, and
6909 `checked_mul` operations for detecting overflow.
6910 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6912 * std: Methods are standardizing on conventions for casting methods:
6913 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6915 * std: The `CString` type in `c_str` provides new ways to convert to and
6917 * std: `DoubleEndedIterator` can yield elements in two directions.
6918 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6920 * std: `str::from_bytes` renamed to `str::from_utf8`.
6921 * std: `pop_opt` and `shift_opt` methods added to vectors.
6922 * std: The task-local data interface no longer uses @, and keys are
6923 no longer function pointers.
6924 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6925 * std: Added `SharedPort` to `comm`.
6926 * std: `Eq` has a default method for `ne`; only `eq` is required
6928 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6929 is required in implementations.
6930 * std: `is_utf8` performance is improved, impacting many string functions.
6931 * std: `os::MemoryMap` provides cross-platform mmap.
6932 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6933 are not 'in-bounds' are considered undefined.
6934 * std: Many freestanding functions in `vec` removed in favor of methods.
6935 * std: Many freestanding functions on scalar types removed in favor of
6937 * std: Many options to task builders were removed since they don't make
6938 sense in the new scheduler design.
6939 * std: More containers implement `FromIterator` so can be created by the
6941 * std: More complete atomic types in `unstable::atomics`.
6942 * std: `comm::PortSet` removed.
6943 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6944 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6945 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6946 default implementations.
6947 * std: Various `from_str` functions were removed in favor of a generic
6948 `from_str` which is available in the prelude.
6949 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6950 * extra: `dlist`, the doubly-linked list was modernized.
6951 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6952 * extra: Added `glob` module, replacing `std::os::glob`.
6953 * extra: `rope` was removed.
6954 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6955 * extra: `net`, and `timer` were removed. The experimental replacements
6956 are `std::rt::io::net` and `std::rt::io::timer`.
6957 * extra: Iterators implemented for `SmallIntMap`.
6958 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6959 * extra: `SmallIntSet` removed. Use `BitvSet`.
6960 * extra: Performance of JSON parsing greatly improved.
6961 * extra: `semver` updated to SemVer 2.0.0.
6962 * extra: `term` handles more terminals correctly.
6963 * extra: `dbg` module removed.
6964 * extra: `par` module removed.
6965 * extra: `future` was cleaned up, with some method renames.
6966 * extra: Most free functions in `getopts` were converted to methods.
6969 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6970 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6971 similarly to gcc's `--march` flag.
6972 * rustc's performance compiling small crates is much better.
6973 * rustpkg has received many improvements.
6974 * rustpkg supports git tags as package IDs.
6975 * rustpkg builds into target-specific directories so it can be used for
6977 * The number of concurrent test tasks is controlled by the environment
6978 variable RUST_TEST_TASKS.
6979 * The test harness can now report metrics for benchmarks.
6980 * All tools have man pages.
6981 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6982 * The runtime uses jemalloc for allocations.
6983 * Segmented stacks are temporarily disabled as part of the transition to
6984 the new runtime. Stack overflows are possible!
6985 * A new documentation backend, rustdoc_ng, is available for use. It is
6986 still invoked through the normal `rustdoc` command.
6989 Version 0.7 (2013-07-03)
6990 =======================
6992 * ~2000 changes, numerous bugfixes
6995 * `impl`s no longer accept a visibility qualifier. Put them on methods
6997 * The borrow checker has been rewritten with flow-sensitivity, fixing
6998 many bugs and inconveniences.
6999 * The `self` parameter no longer implicitly means `&'self self`,
7000 and can be explicitly marked with a lifetime.
7001 * Overloadable compound operators (`+=`, etc.) have been temporarily
7002 removed due to bugs.
7003 * The `for` loop protocol now requires `for`-iterators to return `bool`
7004 so they compose better.
7005 * The `Durable` trait is replaced with the `'static` bounds.
7006 * Trait default methods work more often.
7007 * Structs with the `#[packed]` attribute have byte alignment and
7008 no padding between fields.
7009 * Type parameters bound by `Copy` must now be copied explicitly with
7011 * It is now illegal to move out of a dereferenced unsafe pointer.
7012 * `Option<~T>` is now represented as a nullable pointer.
7013 * `@mut` does dynamic borrow checks correctly.
7014 * The `main` function is only detected at the topmost level of the crate.
7015 The `#[main]` attribute is still valid anywhere.
7016 * Struct fields may no longer be mutable. Use inherited mutability.
7017 * The `#[no_send]` attribute makes a type that would otherwise be
7019 * The `#[no_freeze]` attribute makes a type that would otherwise be
7021 * Unbounded recursion will abort the process after reaching the limit
7022 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
7023 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7024 are never implicitly copyable.
7025 * `#[static_assert]` makes compile-time assertions about static bools.
7026 * At long last, 'argument modes' no longer exist.
7027 * The rarely used `use mod` statement no longer exists.
7030 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
7032 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
7033 `Rand`, `Zero` and `ToStr` can all be automatically derived with
7035 * The `bytes!` macro returns a vector of bytes for string, u8, char,
7036 and unsuffixed integer literals.
7039 * The `core` crate was renamed to `std`.
7040 * The `std` crate was renamed to `extra`.
7041 * More and improved documentation.
7042 * std: `iterator` module for external iterator objects.
7043 * Many old-style (internal, higher-order function) iterators replaced by
7044 implementations of `Iterator`.
7045 * std: Many old internal vector and string iterators,
7046 incl. `any`, `all`. removed.
7047 * std: The `finalize` method of `Drop` renamed to `drop`.
7048 * std: The `drop` method now takes `&mut self` instead of `&self`.
7049 * std: The prelude no longer re-exports any modules, only types and traits.
7050 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
7051 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
7052 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
7053 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
7054 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
7055 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
7056 * std: Many types implement `Clone`.
7057 * std: `path` type renamed to `Path`.
7058 * std: `mut` module and `Mut` type removed.
7059 * std: Many standalone functions removed in favor of methods and iterators
7060 in `vec`, `str`. In the future methods will also work as functions.
7061 * std: `reinterpret_cast` removed. Use `transmute`.
7062 * std: ascii string handling in `std::ascii`.
7063 * std: `Rand` is implemented for ~/@.
7064 * std: `run` module for spawning processes overhauled.
7065 * std: Various atomic types added to `unstable::atomic`.
7066 * std: Various types implement `Zero`.
7067 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
7068 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
7069 * std: Added `os::mkdir_recursive`.
7070 * std: Added `os::glob` function performs filesystems globs.
7071 * std: `FuzzyEq` renamed to `ApproxEq`.
7072 * std: `Map` now defines `pop` and `swap` methods.
7073 * std: `Cell` constructors converted to static methods.
7074 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
7075 * extra: `flate` module moved from `std` to `extra`.
7076 * extra: `fileinput` module for iterating over a series of files.
7077 * extra: `Complex` number type and `complex` module.
7078 * extra: `Rational` number type and `rational` module.
7079 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
7080 * extra: `term` uses terminfo now, is more correct.
7081 * extra: `arc` functions converted to methods.
7082 * extra: Implementation of fixed output size variations of SHA-2.
7085 * `unused_variable` lint mode for unused variables (default: warn).
7086 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
7088 * `unused_mut` lint mode for identifying unused `mut` qualifiers
7090 * `dead_assignment` lint mode for unread variables (default: warn).
7091 * `unnecessary_allocation` lint mode detects some heap allocations that are
7092 immediately borrowed so could be written without allocating (default: warn).
7093 * `missing_doc` lint mode (default: allow).
7094 * `unreachable_code` lint mode (default: warn).
7095 * The `rusti` command has been rewritten and a number of bugs addressed.
7096 * rustc outputs in color on more terminals.
7097 * rustc accepts a `--link-args` flag to pass arguments to the linker.
7098 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
7099 * Compiling with `-g` will make the binary record information about
7100 dynamic borrowcheck failures for debugging.
7101 * rustdoc has a nicer stylesheet.
7102 * Various improvements to rustdoc.
7103 * Improvements to rustpkg (see the detailed release notes).
7106 Version 0.6 (2013-04-03)
7107 ========================
7109 * ~2100 changes, numerous bugfixes
7112 * The self type parameter in traits is now spelled `Self`
7113 * The `self` parameter in trait and impl methods must now be explicitly
7114 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
7115 * Static methods no longer require the `static` keyword and instead
7116 are distinguished by the lack of a `self` parameter
7117 * Replaced the `Durable` trait with the `'static` lifetime
7118 * The old closure type syntax with the trailing sigil has been
7119 removed in favor of the more consistent leading sigil
7120 * `super` is a keyword, and may be prefixed to paths
7121 * Trait bounds are separated with `+` instead of whitespace
7122 * Traits are implemented with `impl Trait for Type`
7123 instead of `impl Type: Trait`
7124 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
7125 * The `export` keyword has finally been removed
7126 * The `move` keyword has been removed (see "Semantic changes")
7127 * The interior mutability qualifier on vectors, `[mut T]`, has been
7128 removed. Use `&mut [T]`, etc.
7129 * `mut` is no longer valid in `~mut T`. Use inherited mutability
7130 * `fail` is no longer a keyword. Use `fail!()`
7131 * `assert` is no longer a keyword. Use `assert!()`
7132 * `log` is no longer a keyword. use `debug!`, etc.
7133 * 1-tuples may be represented as `(T,)`
7134 * Struct fields may no longer be `mut`. Use inherited mutability,
7135 `@mut T`, `core::mut` or `core::cell`
7136 * `extern mod { ... }` is no longer valid syntax for foreign
7137 function modules. Use extern blocks: `extern { ... }`
7138 * Newtype enums removed. Use tuple-structs.
7139 * Trait implementations no longer support visibility modifiers
7140 * Pattern matching over vectors improved and expanded
7141 * `const` renamed to `static` to correspond to lifetime name,
7142 and make room for future `static mut` unsafe mutable globals.
7143 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
7144 * `Clone` implementations can be automatically generated with
7145 `#[deriving(Clone)]`
7146 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
7147 instead of `foo as Bar`.
7148 * Fixed length vector types are now written as `[int, .. 3]`
7149 instead of `[int * 3]`.
7150 * Fixed length vector types can express the length as a constant
7151 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7154 * Types with owned pointers or custom destructors move by default,
7155 eliminating the `move` keyword
7156 * All foreign functions are considered unsafe
7157 * &mut is now unaliasable
7158 * Writes to borrowed @mut pointers are prevented dynamically
7160 * The name of the main function can be customized using #[main]
7161 * The default type of an inferred closure is &fn instead of @fn
7162 * `use` statements may no longer be "chained" - they cannot import
7163 identifiers imported by previous `use` statements
7164 * `use` statements are crate relative, importing from the "top"
7165 of the crate by default. Paths may be prefixed with `super::`
7166 or `self::` to change the search behavior.
7167 * Method visibility is inherited from the implementation declaration
7168 * Structural records have been removed
7169 * Many more types can be used in static items, including enums
7170 'static-lifetime pointers and vectors
7171 * Pattern matching over vectors improved and expanded
7172 * Typechecking of closure types has been overhauled to
7173 improve inference and eliminate unsoundness
7174 * Macros leave scope at the end of modules, unless that module is
7175 tagged with #[macro_escape]
7178 * Added big integers to `std::bigint`
7179 * Removed `core::oldcomm` module
7180 * Added pipe-based `core::comm` module
7181 * Numeric traits have been reorganized under `core::num`
7182 * `vec::slice` finally returns a slice
7183 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7184 * Containers reorganized around traits in `core::container`
7185 * `core::dvec` removed, `~[T]` is a drop-in replacement
7186 * `core::send_map` renamed to `core::hashmap`
7187 * `std::map` removed; replaced with `core::hashmap`
7188 * `std::treemap` reimplemented as an owned balanced tree
7189 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7190 * `core::trie` added as a fast ordered map for integer keys
7191 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7192 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7193 overload the comparison operators, whereas `TotalOrd` is used
7194 by certain container types
7197 * Replaced the 'cargo' package manager with 'rustpkg'
7198 * Added all-purpose 'rust' tool
7199 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7200 * rustc now *attempts* to offer spelling suggestions
7201 * Improved support for ARM and Android
7202 * Preliminary MIPS backend
7203 * Improved foreign function ABI implementation for x86, x86_64
7204 * Various memory usage improvements
7205 * Rust code may be embedded in foreign code under limited circumstances
7206 * Inline assembler supported by new asm!() syntax extension.
7209 Version 0.5 (2012-12-21)
7210 ===========================
7212 * ~900 changes, numerous bugfixes
7215 * Removed `<-` move operator
7216 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7217 * Removed old fixed length vector syntax - `[T]/N`
7218 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7219 * Macros may now expand to items and statements
7220 * `a.b()` is always parsed as a method call, never as a field projection
7221 * `Eq` and `IterBytes` implementations can be automatically generated
7222 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7223 * Removed the special crate language for `.rc` files
7224 * Function arguments may consist of any irrefutable pattern
7227 * `&` and `~` pointers may point to objects
7228 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7229 * Enum variants may be structs
7230 * Destructors can be added to all nominal types with the Drop trait
7231 * Structs and nullary enum variants may be constants
7232 * Values that cannot be implicitly copied are now automatically moved
7233 without writing `move` explicitly
7234 * `&T` may now be coerced to `*T`
7235 * Coercions happen in `let` statements as well as function calls
7236 * `use` statements now take crate-relative paths
7237 * The module and type namespaces have been merged so that static
7238 method names can be resolved under the trait in which they are
7241 * Improved support for language features
7242 * Trait inheritance works in many scenarios
7243 * More support for explicit self arguments in methods - `self`, `&self`
7244 `@self`, and `~self` all generally work as expected
7245 * Static methods work in more situations
7246 * Experimental: Traits may declare default methods for the implementations
7250 * New condition handling system in `core::condition`
7251 * Timsort added to `std::sort`
7252 * New priority queue, `std::priority_queue`
7253 * Pipes for serializable types, `std::flatpipes'
7254 * Serialization overhauled to be trait-based
7255 * Expanded `getopts` definitions
7256 * Moved futures to `std`
7257 * More functions are pure now
7258 * `core::comm` renamed to `oldcomm`. Still deprecated
7259 * `rustdoc` and `cargo` are libraries now
7262 * Added a preliminary REPL, `rusti`
7263 * License changed from MIT to dual MIT/APL2
7266 Version 0.4 (2012-10-15)
7267 ==========================
7269 * ~2000 changes, numerous bugfixes
7272 * All keywords are now strict and may not be used as identifiers anywhere
7273 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7274 'of', 'with', 'to', 'class'.
7275 * Classes are replaced with simpler structs
7276 * Explicit method self types
7277 * `ret` became `return` and `alt` became `match`
7278 * `import` is now `use`; `use is now `extern mod`
7279 * `extern mod { ... }` is now `extern { ... }`
7280 * `use mod` is the recommended way to import modules
7281 * `pub` and `priv` replace deprecated export lists
7282 * The syntax of `match` pattern arms now uses fat arrow (=>)
7283 * `main` no longer accepts an args vector; use `os::args` instead
7286 * Trait implementations are now coherent, ala Haskell typeclasses
7287 * Trait methods may be static
7288 * Argument modes are deprecated
7289 * Borrowed pointers are much more mature and recommended for use
7290 * Strings and vectors in the static region are stored in constant memory
7291 * Typestate was removed
7292 * Resolution rewritten to be more reliable
7293 * Support for 'dual-mode' data structures (freezing and thawing)
7296 * Most binary operators can now be overloaded via the traits in
7298 * `std::net::url` for representing URLs
7299 * Sendable hash maps in `core::send_map`
7300 * `core::task' gained a (currently unsafe) task-local storage API
7303 * An efficient new intertask communication primitive called the pipe,
7304 along with a number of higher-level channel types, in `core::pipes`
7305 * `std::arc`, an atomically reference counted, immutable, shared memory
7307 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7308 * Futures are now based on pipes and sendable
7309 * More robust linked task failure
7310 * Improved task builder API
7313 * Improved error reporting
7314 * Preliminary JIT support
7315 * Preliminary work on precise GC
7316 * Extensive architectural improvements to rustc
7317 * Begun a transition away from buggy C++-based reflection (shape) code to
7318 Rust-based (visitor) code
7319 * All hash functions and tables converted to secure, randomized SipHash
7322 Version 0.3 (2012-07-12)
7323 ========================
7325 * ~1900 changes, numerous bugfixes
7327 * New coding conveniences
7328 * Integer-literal suffix inference
7329 * Per-item control over warnings, errors
7330 * #[cfg(windows)] and #[cfg(unix)] attributes
7331 * Documentation comments
7332 * More compact closure syntax
7333 * 'do' expressions for treating higher-order functions as
7335 * *-patterns (wildcard extended to all constructor fields)
7338 * Name resolution pass and exhaustiveness checker rewritten
7339 * Region pointers and borrow checking supersede alias
7341 * Init-ness checking is now provided by a region-based liveness
7342 pass instead of the typestate pass; same for last-use analysis
7343 * Extensive work on region pointers
7345 * Experimental new language features
7346 * Slices and fixed-size, interior-allocated vectors
7347 * #!-comments for lang versioning, shell execution
7348 * Destructors and iface implementation for classes;
7349 type-parameterized classes and class methods
7350 * 'const' type kind for types that can be used to implement
7351 shared-memory concurrency patterns
7355 * Removal of various obsolete features
7356 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7357 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7359 * Constructs: do-while loops ('do' repurposed), fn binding,
7360 resources (replaced by destructors)
7362 * Compiler reorganization
7363 * Syntax-layer of compiler split into separate crate
7364 * Clang (from LLVM project) integrated into build
7365 * Typechecker split into sub-modules
7368 * New time functions
7369 * Extension methods for many built-in types
7370 * Arc: atomic-refcount read-only / exclusive-use shared cells
7371 * Par: parallel map and search routines
7372 * Extensive work on libuv interface
7373 * Much vector code moved to libraries
7374 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7375 #include, #include_str, #include_bin
7378 * Cargo automatically resolves dependencies
7381 Version 0.2 (2012-03-29)
7382 =========================
7384 * >1500 changes, numerous bugfixes
7386 * New docs and doc tooling
7388 * New port: FreeBSD x86_64
7390 * Compilation model enhancements
7391 * Generics now specialized, multiply instantiated
7392 * Functions now inlined across separate crates
7394 * Scheduling, stack and threading fixes
7395 * Noticeably improved message-passing performance
7396 * Explicit schedulers
7400 * Experimental new language features
7401 * Operator overloading
7405 * Various language extensions
7406 * C-callback function types: 'crust fn ...'
7407 * Infinite-loop construct: 'loop { ... }'
7408 * Shorten 'mutable' to 'mut'
7409 * Required mutable-local qualifier: 'let mut ...'
7410 * Basic glob-exporting: 'export foo::*;'
7411 * Alt now exhaustive, 'alt check' for runtime-checked
7412 * Block-function form of 'for' loop, with 'break' and 'ret'.
7415 * AST quasi-quote syntax extension
7416 * Revived libuv interface
7417 * New modules: core::{future, iter}, std::arena
7418 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7419 * Extensive cleanup, regularization in libstd, libcore
7422 Version 0.1 (2012-01-20)
7423 ===============================
7425 * Most language features work, including:
7426 * Unique pointers, unique closures, move semantics
7427 * Interface-constrained generics
7428 * Static interface dispatch
7430 * Multithread task scheduling
7431 * Typestate predicates
7432 * Failure unwinding, destructors
7433 * Pattern matching and destructuring assignment
7434 * Lightweight block-lambda syntax
7435 * Preliminary macro-by-example
7437 * Compiler works with the following configurations:
7438 * Linux: x86 and x86_64 hosts and targets
7439 * macOS: x86 and x86_64 hosts and targets
7440 * Windows: x86 hosts and targets
7442 * Cross compilation / multi-target configuration supported.
7444 * Preliminary API-documentation and package-management tools included.
7448 * Documentation is incomplete.
7450 * Performance is below intended target.
7452 * Standard library APIs are subject to extensive change, reorganization.
7454 * Language-level versioning is not yet operational - future code will