1 Version 1.53.0 (2021-06-17)
2 ============================
5 -----------------------
6 - [You can now use unicode for identifiers.][83799] This allows multilingual
7 identifiers but still doesn't allow glyphs that are not considered characters
8 such as `◆` or `🦀`. More specifically you can now use any identifier that
9 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
10 is the same standard as languages like Python, however Rust uses NFC
11 normalization which may be different from other languages.
12 - [You can now specify "or patterns" inside pattern matches.][79278]
13 Previously you could only use `|` (OR) on complete patterns. E.g.
17 matches!(x, Some(1) | Some(2));
19 matches!(x, Some(1 | 2));
21 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
22 has the same semantics as the `:pat` matcher. This is to allow `:pat`
23 to change semantics to being a pattern fragment in a future edition.
26 -----------------------
27 - [Updated the minimum external LLVM version to LLVM 10.][83387]
28 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
29 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
31 \* Refer to Rust's [platform support page][platform-support-doc] for more
32 information on Rust's tiered platform support.
35 -----------------------
36 - [Abort messages will now forward to `android_set_abort_message` on
37 Android platforms when available.][81469]
38 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
39 - [Arrays of any length now implement `IntoIterator`.][84147]
40 Currently call `.into_iter()` as a method on an array will
41 return `impl Iterator<Item=&T>`, but this may change in a
42 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
43 directly on arrays will provide `impl Iterator<Item=T>` as expected.
44 - [`NonZero<T>::{leading_zeros, trailing_zeros}` is now `const`.][84082]
45 - [`{f32, f64}::from_str` now parse and print special values
46 (`NaN`, `-0`) according to IEEE RFC 754.][78618]
47 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
48 - [Add the `BITS` associated constant to all numeric types.][82565]
52 - [`AtomicBool::fetch_update`]
53 - [`AtomicPtr::fetch_update`]
54 - [`BTreeMap::retain`]
55 - [`BTreeSet::retain`]
56 - [`BufReader::seek_relative`]
57 - [`DebugStruct::non_exhaustive`]
60 - [`Duration::is_zero`]
61 - [`Duration::saturating_add`]
62 - [`Duration::saturating_mul`]
63 - [`Duration::saturating_sub`]
64 - [`ErrorKind::Unsupported`]
73 - [`OsStr::make_ascii_lowercase`]
74 - [`OsStr::make_ascii_uppercase`]
75 - [`OsStr::to_ascii_lowercase`]
76 - [`OsStr::to_ascii_uppercase`]
77 - [`Peekable::peek_mut`]
78 - [`Rc::decrement_strong_count`]
79 - [`Rc::increment_strong_count`]
80 - [`Vec::extend_from_within`]
84 - [`char::REPLACEMENT_CHARACTER`]
85 - [`char::UNICODE_VERSION`]
86 - [`char::decode_utf16`]
87 - [`char::from_digit`]
88 - [`char::from_u32_unchecked`]
94 - [`f32::is_subnormal`]
95 - [`f64::is_subnormal`]
98 -----------------------
99 - [Cargo now supports git repositories where the default `HEAD` branch is not
100 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
101 which can handle default branches correctly.
102 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
103 - [The `authors` field is no longer included in `Cargo.toml` for new
104 projects.][cargo/9282]
107 -----------------------
108 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
109 without hyperlinks.][81764]
113 - [Implement token-based handling of attributes during expansion][82608]
114 - [`Ipv4::from_str` will now reject octal format IP addresses.][83652] The octal format
115 can lead to confusion and potential security vulnerabilities and [is no longer recommended][ietf6943].
120 These changes provide no direct user facing benefits, but represent significant
121 improvements to the internals and overall performance of rustc and
124 - [Rework the `std::sys::windows::alloc` implementation.][83065]
125 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
126 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
127 - [Rework rustdoc const type][82873]
129 [83386]: https://github.com/rust-lang/rust/pull/83386
130 [82771]: https://github.com/rust-lang/rust/pull/82771
131 [84147]: https://github.com/rust-lang/rust/pull/84147
132 [84082]: https://github.com/rust-lang/rust/pull/84082
133 [83799]: https://github.com/rust-lang/rust/pull/83799
134 [83681]: https://github.com/rust-lang/rust/pull/83681
135 [83652]: https://github.com/rust-lang/rust/pull/83652
136 [83387]: https://github.com/rust-lang/rust/pull/83387
137 [82873]: https://github.com/rust-lang/rust/pull/82873
138 [82864]: https://github.com/rust-lang/rust/pull/82864
139 [82608]: https://github.com/rust-lang/rust/pull/82608
140 [82565]: https://github.com/rust-lang/rust/pull/82565
141 [80525]: https://github.com/rust-lang/rust/pull/80525
142 [79278]: https://github.com/rust-lang/rust/pull/79278
143 [78618]: https://github.com/rust-lang/rust/pull/78618
144 [77704]: https://github.com/rust-lang/rust/pull/77704
145 [83941]: https://github.com/rust-lang/rust/pull/83941
146 [83065]: https://github.com/rust-lang/rust/pull/83065
147 [81764]: https://github.com/rust-lang/rust/pull/81764
148 [81469]: https://github.com/rust-lang/rust/pull/81469
149 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
150 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
151 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
152 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
153 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
154 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
155 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
156 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
157 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
158 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
159 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
160 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
161 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
162 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
163 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
164 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
165 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
166 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
167 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
168 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
169 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
170 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
171 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
172 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
173 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
174 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
175 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
176 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
177 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
178 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
179 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
180 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
181 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
182 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
183 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
184 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
185 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
186 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
187 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
188 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
189 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
190 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
191 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
192 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
193 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
194 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
195 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
196 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
197 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
200 Version 1.52.1 (2021-05-10)
201 ============================
203 This release disables incremental compilation, unless the user has explicitly
204 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
206 This is due to the widespread, and frequently occuring, breakage encountered by
207 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
208 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
209 newly added incremental verification are still present in past stable versions,
210 and are not yet fixed on any channel. These bugs can lead to miscompilation of
213 These problems only affect incremental builds, so release builds with Cargo
214 should not be affected unless the user has explicitly opted into incremental.
215 Debug and check builds are affected.
217 See [84970] for more details.
219 [84970]: https://github.com/rust-lang/rust/issues/84970
221 Version 1.52.0 (2021-05-06)
222 ============================
226 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
227 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
228 is allowed by default, and may become a warning or hard error in a
230 - [You can now cast mutable references to arrays to a pointer of the same type as
235 - [Upgraded the default LLVM to LLVM 12.][81451]
237 Added tier 3\* support for the following targets.
239 - [`s390x-unknown-linux-musl`][82166]
240 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
241 - [`powerpc-unknown-openbsd`][82733]
243 \* Refer to Rust's [platform support page][platform-support-doc] for more
244 information on Rust's tiered platform support.
248 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
249 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
250 - [`Arc<impl Error>` now implements `error::Error`.][80553]
251 - [All integer division and remainder operations are now `const`.][80962]
255 - [`Arguments::as_str`]
257 - [`char::REPLACEMENT_CHARACTER`]
258 - [`char::UNICODE_VERSION`]
259 - [`char::decode_utf16`]
260 - [`char::from_digit`]
261 - [`char::from_u32_unchecked`]
263 - [`slice::partition_point`]
264 - [`str::rsplit_once`]
265 - [`str::split_once`]
267 The following previously stable APIs are now `const`.
270 - [`char::len_utf16`]
271 - [`char::to_ascii_uppercase`]
272 - [`char::to_ascii_lowercase`]
273 - [`char::eq_ignore_ascii_case`]
274 - [`u8::to_ascii_uppercase`]
275 - [`u8::to_ascii_lowercase`]
276 - [`u8::eq_ignore_ascii_case`]
280 - [Rustdoc lints are now treated as a tool lint, meaning that
281 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
282 Using the old style is still allowed, and will become a warning in
284 - [Rustdoc now supports argument files.][82261]
285 - [Rustdoc now generates smart punctuation for documentation.][79423]
286 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
294 - [You can now pass multiple filters to tests.][81356] E.g.
295 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
296 - [Rustup now distributes PDB symbols for the `std` library on Windows,
297 allowing you to see `std` symbols when debugging.][82218]
301 These changes provide no direct user facing benefits, but represent significant
302 improvements to the internals and overall performance of rustc and
305 - [Check the result cache before the DepGraph when ensuring queries][81855]
306 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
307 - [Only store a LocalDefId in some HIR nodes][81611]
308 - [Store HIR attributes in a side table][79519]
312 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
313 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
314 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
315 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
316 languages in code blocks.][78429]
317 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
318 - [Changes in how proc macros handle whitespace may lead to panics when used
319 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
321 [84136]: https://github.com/rust-lang/rust/issues/84136
322 [80763]: https://github.com/rust-lang/rust/pull/80763
323 [82166]: https://github.com/rust-lang/rust/pull/82166
324 [82121]: https://github.com/rust-lang/rust/pull/82121
325 [81879]: https://github.com/rust-lang/rust/pull/81879
326 [82261]: https://github.com/rust-lang/rust/pull/82261
327 [82218]: https://github.com/rust-lang/rust/pull/82218
328 [82216]: https://github.com/rust-lang/rust/pull/82216
329 [82202]: https://github.com/rust-lang/rust/pull/82202
330 [81855]: https://github.com/rust-lang/rust/pull/81855
331 [81766]: https://github.com/rust-lang/rust/pull/81766
332 [81744]: https://github.com/rust-lang/rust/pull/81744
333 [81611]: https://github.com/rust-lang/rust/pull/81611
334 [81479]: https://github.com/rust-lang/rust/pull/81479
335 [81451]: https://github.com/rust-lang/rust/pull/81451
336 [81356]: https://github.com/rust-lang/rust/pull/81356
337 [80962]: https://github.com/rust-lang/rust/pull/80962
338 [80553]: https://github.com/rust-lang/rust/pull/80553
339 [80527]: https://github.com/rust-lang/rust/pull/80527
340 [79519]: https://github.com/rust-lang/rust/pull/79519
341 [79423]: https://github.com/rust-lang/rust/pull/79423
342 [79208]: https://github.com/rust-lang/rust/pull/79208
343 [78429]: https://github.com/rust-lang/rust/pull/78429
344 [82733]: https://github.com/rust-lang/rust/pull/82733
345 [82594]: https://github.com/rust-lang/rust/pull/82594
346 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
347 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
348 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
349 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
350 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
351 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
352 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
353 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
354 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
355 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
356 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
357 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
358 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
359 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
360 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
361 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
362 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
363 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
364 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
365 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
366 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
367 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
369 Version 1.51.0 (2021-03-25)
370 ============================
374 - [You can now parameterize items such as functions, traits, and `struct`s by constant
375 values in addition to by types and lifetimes.][79135] Also known as "const generics"
376 E.g. you can now write the following. Note: Only values of primitive integers,
377 `bool`, or `char` types are currently permitted.
379 struct GenericArray<T, const LENGTH: usize> {
383 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
384 const fn last(&self) -> Option<&T> {
388 Some(&self.inner[LENGTH - 1])
398 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
399 This option controls whether debug information is split across multiple files
400 or packed into a single file. **Note** This option is unstable on other platforms.
401 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
402 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
403 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
404 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
406 \* Refer to Rust's [platform support page][platform-support-doc] for more
407 information on Rust's tiered platform support.
412 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
413 - [`str` now implements `AsMut<str>`.][80279]
414 - [`u64` and `u128` now implement `From<char>`.][79502]
415 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
416 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
417 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
418 - [`io::Empty` now implements `io::Seek`.][78044]
419 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
420 `T: ?Sized` types.][80764]
421 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
427 - [`Arc::decrement_strong_count`]
428 - [`Arc::increment_strong_count`]
429 - [`Once::call_once_force`]
430 - [`Peekable::next_if_eq`]
431 - [`Peekable::next_if`]
432 - [`Seek::stream_position`]
433 - [`array::IntoIter`]
434 - [`panic::panic_any`]
436 - [`ptr::addr_of_mut!`]
437 - [`slice::fill_with`]
438 - [`slice::split_inclusive_mut`]
439 - [`slice::split_inclusive`]
440 - [`slice::strip_prefix`]
441 - [`slice::strip_suffix`]
442 - [`str::split_inclusive`]
443 - [`sync::OnceState`]
445 - [`VecDeque::range`]
446 - [`VecDeque::range_mut`]
450 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
451 codegen option.][cargo/9112]
452 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
453 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
454 to avoid unifying features of dependencies where that unification could be unwanted.
455 Such as using the same dependency with a `std` feature in a build scripts and
456 proc-macros, while using the `no-std` feature in the final binary. See the
457 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
462 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
463 - [You can now provide a `--default-theme` flag which sets the default theme to use for
464 documentation.][79642]
466 Various improvements to intra-doc links:
468 - [You can link to non-path primitives such as `slice`.][80181]
469 - [You can link to associated items.][74489]
470 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
474 - [You can now pass `--include-ignored` to tests (e.g. with
475 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
480 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
481 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
483 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
484 for the distributed artifacts.][81521]
485 - `armv5te-unknown-linux-gnueabi`
486 - `sparc64-unknown-linux-gnu`
487 - `thumbv7neon-unknown-linux-gnueabihf`
488 - `armv7-unknown-linux-gnueabi`
489 - `x86_64-unknown-linux-gnux32`
490 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
495 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
497 [79135]: https://github.com/rust-lang/rust/pull/79135
498 [74489]: https://github.com/rust-lang/rust/pull/74489
499 [76934]: https://github.com/rust-lang/rust/pull/76934
500 [79570]: https://github.com/rust-lang/rust/pull/79570
501 [80181]: https://github.com/rust-lang/rust/pull/80181
502 [79642]: https://github.com/rust-lang/rust/pull/79642
503 [80945]: https://github.com/rust-lang/rust/pull/80945
504 [80279]: https://github.com/rust-lang/rust/pull/80279
505 [80053]: https://github.com/rust-lang/rust/pull/80053
506 [79502]: https://github.com/rust-lang/rust/pull/79502
507 [75180]: https://github.com/rust-lang/rust/pull/75180
508 [79135]: https://github.com/rust-lang/rust/pull/79135
509 [81521]: https://github.com/rust-lang/rust/pull/81521
510 [80968]: https://github.com/rust-lang/rust/pull/80968
511 [80959]: https://github.com/rust-lang/rust/pull/80959
512 [80718]: https://github.com/rust-lang/rust/pull/80718
513 [80653]: https://github.com/rust-lang/rust/pull/80653
514 [80579]: https://github.com/rust-lang/rust/pull/80579
515 [79998]: https://github.com/rust-lang/rust/pull/79998
516 [78044]: https://github.com/rust-lang/rust/pull/78044
517 [81455]: https://github.com/rust-lang/rust/pull/81455
518 [80764]: https://github.com/rust-lang/rust/pull/80764
519 [80749]: https://github.com/rust-lang/rust/pull/80749
520 [80662]: https://github.com/rust-lang/rust/pull/80662
521 [79134]: https://github.com/rust-lang/rust/pull/79134
522 [80966]: https://github.com/rust-lang/rust/pull/80966
523 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
524 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
525 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
526 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
527 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
528 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
529 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
530 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
531 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
532 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
533 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
534 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
535 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
536 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
537 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
538 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
539 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
540 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
541 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
542 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
543 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
544 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
545 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
547 Version 1.50.0 (2021-02-11)
548 ============================
551 -----------------------
552 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
553 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
554 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
557 -----------------------
558 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
559 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
560 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
561 - [Dropped support for all cloudabi targets.][78439]
563 \* Refer to Rust's [platform support page][platform-support-doc] for more
564 information on Rust's tiered platform support.
567 -----------------------
569 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
570 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
571 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
572 This value cannot be a valid file descriptor, and now means `Option<File>` takes
573 up the same amount of space as `File`.
579 - [`btree_map::Entry::or_insert_with_key`]
582 - [`hash_map::Entry::or_insert_with_key`]
586 - [`UnsafeCell::get_mut`]
588 The following previously stable methods are now `const`.
590 - [`IpAddr::is_ipv4`]
591 - [`IpAddr::is_ipv6`]
592 - [`IpAddr::is_unspecified`]
593 - [`IpAddr::is_loopback`]
594 - [`IpAddr::is_multicast`]
595 - [`Ipv4Addr::octets`]
596 - [`Ipv4Addr::is_loopback`]
597 - [`Ipv4Addr::is_private`]
598 - [`Ipv4Addr::is_link_local`]
599 - [`Ipv4Addr::is_multicast`]
600 - [`Ipv4Addr::is_broadcast`]
601 - [`Ipv4Addr::is_documentation`]
602 - [`Ipv4Addr::to_ipv6_compatible`]
603 - [`Ipv4Addr::to_ipv6_mapped`]
604 - [`Ipv6Addr::segments`]
605 - [`Ipv6Addr::is_unspecified`]
606 - [`Ipv6Addr::is_loopback`]
607 - [`Ipv6Addr::is_multicast`]
608 - [`Ipv6Addr::to_ipv4`]
611 - [`Layout::from_size_align`]
612 - `pow` for all integer types.
613 - `checked_pow` for all integer types.
614 - `saturating_pow` for all integer types.
615 - `wrapping_pow` for all integer types.
616 - `next_power_of_two` for all unsigned integer types.
617 - `checked_next_power_of_two` for all unsigned integer types.
620 -----------------------
622 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
623 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
624 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
625 contents of that directory for changes.][cargo/8973]
626 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
631 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
632 - [Running tests will now print the total time taken to execute.][75752]
637 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
638 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
639 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
640 unhygenic `macro_rules!` macros.][79472]
641 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
642 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
643 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
644 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
645 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
646 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
648 [74989]: https://github.com/rust-lang/rust/pull/74989
649 [79261]: https://github.com/rust-lang/rust/pull/79261
650 [79896]: https://github.com/rust-lang/rust/pull/79896
651 [79484]: https://github.com/rust-lang/rust/pull/79484
652 [79472]: https://github.com/rust-lang/rust/pull/79472
653 [79270]: https://github.com/rust-lang/rust/pull/79270
654 [79003]: https://github.com/rust-lang/rust/pull/79003
655 [78864]: https://github.com/rust-lang/rust/pull/78864
656 [78636]: https://github.com/rust-lang/rust/pull/78636
657 [78439]: https://github.com/rust-lang/rust/pull/78439
658 [78343]: https://github.com/rust-lang/rust/pull/78343
659 [78296]: https://github.com/rust-lang/rust/pull/78296
660 [78068]: https://github.com/rust-lang/rust/pull/78068
661 [75752]: https://github.com/rust-lang/rust/pull/75752
662 [74699]: https://github.com/rust-lang/rust/pull/74699
663 [78142]: https://github.com/rust-lang/rust/pull/78142
664 [77484]: https://github.com/rust-lang/rust/pull/77484
665 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
666 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
667 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
668 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
669 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
670 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
671 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
672 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
673 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
674 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
675 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
676 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
677 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
678 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
679 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
680 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
681 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
682 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
683 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
684 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
685 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
686 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
687 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
688 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
689 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
690 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
691 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
692 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
693 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
694 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
695 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
696 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
697 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
698 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
701 Version 1.49.0 (2020-12-31)
702 ============================
705 -----------------------
707 - [Unions can now implement `Drop`, and you can now have a field in a union
708 with `ManuallyDrop<T>`.][77547]
709 - [You can now cast uninhabited enums to integers.][76199]
710 - [You can now bind by reference and by move in patterns.][76119] This
711 allows you to selectively borrow individual components of a type. E.g.
719 let person = Person {
720 name: String::from("Alice"),
724 // `name` is moved out of person, but `age` is referenced.
725 let Person { name, ref age } = person;
726 println!("{} {}", name, age);
730 -----------------------
732 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
733 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
734 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
735 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
736 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
737 - [Output from threads spawned in tests is now captured.][78227]
738 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
740 \* Refer to Rust's [platform support page][platform-support-doc] for more
741 information on Rust's tiered platform support.
744 -----------------------
746 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
747 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
752 - [`slice::select_nth_unstable`]
753 - [`slice::select_nth_unstable_by`]
754 - [`slice::select_nth_unstable_by_key`]
756 The following previously stable methods are now `const`.
759 - [`Poll::is_pending`]
762 -----------------------
763 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
764 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
765 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
766 variable will be set if the crate being built is one the user selected to build, either
767 with `-p` or through defaults.
768 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
774 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
775 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
776 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
777 Previously such invalid or unused attributes could be ignored.
778 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
779 read [this post about the changes][rustdoc-ws-post] for more details.
780 - [Trait bounds are no longer inferred for associated types.][79904]
784 These changes provide no direct user facing benefits, but represent significant
785 improvements to the internals and overall performance of rustc and
788 - [rustc's internal crates are now compiled using the `initial-exec` Thread
789 Local Storage model.][78201]
790 - [Calculate visibilities once in resolve.][78077]
791 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
792 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
795 [75991]: https://github.com/rust-lang/rust/pull/75991
796 [78951]: https://github.com/rust-lang/rust/pull/78951
797 [78848]: https://github.com/rust-lang/rust/pull/78848
798 [78746]: https://github.com/rust-lang/rust/pull/78746
799 [78376]: https://github.com/rust-lang/rust/pull/78376
800 [78228]: https://github.com/rust-lang/rust/pull/78228
801 [78227]: https://github.com/rust-lang/rust/pull/78227
802 [78201]: https://github.com/rust-lang/rust/pull/78201
803 [78109]: https://github.com/rust-lang/rust/pull/78109
804 [78077]: https://github.com/rust-lang/rust/pull/78077
805 [77997]: https://github.com/rust-lang/rust/pull/77997
806 [77703]: https://github.com/rust-lang/rust/pull/77703
807 [77547]: https://github.com/rust-lang/rust/pull/77547
808 [77015]: https://github.com/rust-lang/rust/pull/77015
809 [76199]: https://github.com/rust-lang/rust/pull/76199
810 [76119]: https://github.com/rust-lang/rust/pull/76119
811 [75914]: https://github.com/rust-lang/rust/pull/75914
812 [79004]: https://github.com/rust-lang/rust/pull/79004
813 [78676]: https://github.com/rust-lang/rust/pull/78676
814 [79904]: https://github.com/rust-lang/rust/issues/79904
815 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
816 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
817 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
818 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
819 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
820 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
821 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
822 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
823 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
824 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
825 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
827 Version 1.48.0 (2020-11-19)
828 ==========================
833 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
834 is still rejected *semantically*, but can now be parsed by procedural macros.
838 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
839 `rustc` whether to link its own C runtime and libraries or to rely on a external
840 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
841 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
842 Note: If you're using cargo you must explicitly pass the `--target` flag.
843 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
845 \* Refer to Rust's [platform support page][platform-support-doc] for more
846 information on Rust's tiered platform support.
850 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
851 and `&Stderr`.][76275]
852 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
853 - [The `matches!` macro now supports having a trailing comma.][74880]
854 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
855 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
859 - [`slice::as_ptr_range`]
860 - [`slice::as_mut_ptr_range`]
861 - [`VecDeque::make_contiguous`]
862 - [`future::pending`]
865 The following previously stable methods are now `const fn`'s:
867 - [`Option::is_some`]
868 - [`Option::is_none`]
873 - [`Ordering::reverse`]
881 - [You can now link to items in `rustdoc` using the intra-doc link
882 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
883 a link to `std::future`'s documentation. See ["Linking to items by
884 name"][intradoc-links] for more information.
885 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
886 when searching through `rustdoc`'s UI.][75740]
890 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
891 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
892 promoted to `'static` lifetime any more inside `const fn`s.
893 - [Associated type bindings on trait objects are now verified to meet the bounds
894 declared on the trait when checking that they implement the trait.][27675]
895 - [When trait bounds on associated types or opaque types are ambiguous, the
896 compiler no longer makes an arbitrary choice on which bound to use.][54121]
897 - [Fixed recursive nonterminals not being expanded in macros during
898 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
899 correctly handling recursive nonterminal tokens.
900 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
901 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
902 in places where they have no effect.][73461]
903 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
904 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
905 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
906 disallow zero-initialization.][71274]
907 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
908 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
909 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
910 see the [`catch_unwind`] documentation for further information.
916 These changes provide no direct user facing benefits, but represent significant
917 improvements to the internals and overall performance of rustc and
920 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
921 You can continue building with `make` by setting `ninja=false` in
923 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
924 - [Made `ensure_sufficient_stack()` non-generic][76680]
926 [78143]: https://github.com/rust-lang/rust/issues/78143
927 [76680]: https://github.com/rust-lang/rust/pull/76680/
928 [76030]: https://github.com/rust-lang/rust/pull/76030/
929 [70212]: https://github.com/rust-lang/rust/pull/70212/
930 [27675]: https://github.com/rust-lang/rust/issues/27675/
931 [54121]: https://github.com/rust-lang/rust/issues/54121/
932 [71274]: https://github.com/rust-lang/rust/pull/71274/
933 [77386]: https://github.com/rust-lang/rust/pull/77386/
934 [77153]: https://github.com/rust-lang/rust/pull/77153/
935 [77055]: https://github.com/rust-lang/rust/pull/77055/
936 [76275]: https://github.com/rust-lang/rust/pull/76275/
937 [76310]: https://github.com/rust-lang/rust/pull/76310/
938 [76420]: https://github.com/rust-lang/rust/pull/76420/
939 [76158]: https://github.com/rust-lang/rust/pull/76158/
940 [75857]: https://github.com/rust-lang/rust/pull/75857/
941 [75585]: https://github.com/rust-lang/rust/pull/75585/
942 [75740]: https://github.com/rust-lang/rust/pull/75740/
943 [75502]: https://github.com/rust-lang/rust/pull/75502/
944 [74880]: https://github.com/rust-lang/rust/pull/74880/
945 [74922]: https://github.com/rust-lang/rust/pull/74922/
946 [74430]: https://github.com/rust-lang/rust/pull/74430/
947 [74194]: https://github.com/rust-lang/rust/pull/74194/
948 [73461]: https://github.com/rust-lang/rust/pull/73461/
949 [73166]: https://github.com/rust-lang/rust/pull/73166/
950 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
951 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
952 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
953 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
954 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
955 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
956 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
957 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
958 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
959 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
960 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
961 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
962 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
963 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
964 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
967 Version 1.47.0 (2020-10-08)
968 ==========================
972 - [Closures will now warn when not used.][74869]
976 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
977 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
979 - [Upgraded to LLVM 11.][73526]
980 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
981 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
982 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
984 \* Refer to Rust's [platform support page][platform-support-doc] for more
985 information on Rust's tiered platform support.
989 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
990 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
991 those of length less than 33.][74060]
992 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
993 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
994 `PartialEq`, and `PartialOrd`.][73583]
999 - [`Range::is_empty`]
1000 - [`RangeInclusive::is_empty`]
1001 - [`Result::as_deref`]
1002 - [`Result::as_deref_mut`]
1004 - [`pointer::offset_from`]
1008 The following previously stable APIs have now been made const.
1010 - [The `new` method for all `NonZero` integers.][73858]
1011 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1012 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1013 methods for all integers.][73858]
1014 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1015 signed integers.][73858]
1016 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1017 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1018 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1019 `is_ascii_control` methods for `char` and `u8`.][73858]
1023 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1024 You can override this by setting the following in your `Cargo.toml`.
1026 [profile.release.build-override]
1029 - [`cargo-help` will now display man pages for commands rather just the
1030 `--help` text.][cargo/8456]
1031 - [`cargo-metadata` now emits a `test` field indicating if a target has
1032 tests enabled.][cargo/8478]
1033 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1034 - [`cargo-publish` will now use an alternative registry by default if it's the
1035 only registry specified in `package.publish`.][cargo/8571]
1039 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1040 type based search.][75366]
1041 - [Added the Ayu theme to rustdoc.][71237]
1045 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1046 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1047 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1048 help to preserve more span information.][73084] These changes may cause
1049 compiliation errors if your macro was unhygenic or didn't correctly handle
1051 - [Moved support for the CloudABI target to tier 3.][75568]
1052 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1053 - [Added the `rustc-docs` component.][75560] This allows you to install
1054 and read the documentation for the compiler internal APIs. (Currently only
1055 available for `x86_64-unknown-linux-gnu`.)
1060 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
1062 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1063 [75048]: https://github.com/rust-lang/rust/pull/75048/
1064 [74163]: https://github.com/rust-lang/rust/pull/74163/
1065 [71237]: https://github.com/rust-lang/rust/pull/71237/
1066 [74869]: https://github.com/rust-lang/rust/pull/74869/
1067 [73858]: https://github.com/rust-lang/rust/pull/73858/
1068 [75716]: https://github.com/rust-lang/rust/pull/75716/
1069 [75908]: https://github.com/rust-lang/rust/pull/75908/
1070 [75516]: https://github.com/rust-lang/rust/pull/75516/
1071 [75560]: https://github.com/rust-lang/rust/pull/75560/
1072 [75568]: https://github.com/rust-lang/rust/pull/75568/
1073 [75366]: https://github.com/rust-lang/rust/pull/75366/
1074 [75204]: https://github.com/rust-lang/rust/pull/75204/
1075 [74650]: https://github.com/rust-lang/rust/pull/74650/
1076 [74419]: https://github.com/rust-lang/rust/pull/74419/
1077 [73964]: https://github.com/rust-lang/rust/pull/73964/
1078 [74021]: https://github.com/rust-lang/rust/pull/74021/
1079 [74060]: https://github.com/rust-lang/rust/pull/74060/
1080 [73893]: https://github.com/rust-lang/rust/pull/73893/
1081 [73526]: https://github.com/rust-lang/rust/pull/73526/
1082 [73583]: https://github.com/rust-lang/rust/pull/73583/
1083 [73084]: https://github.com/rust-lang/rust/pull/73084/
1084 [73197]: https://github.com/rust-lang/rust/pull/73197/
1085 [72488]: https://github.com/rust-lang/rust/pull/72488/
1086 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1087 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1088 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1089 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1090 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1091 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1092 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1093 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1094 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1095 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1096 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1097 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1098 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1099 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1100 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1103 Version 1.46.0 (2020-08-27)
1104 ==========================
1108 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1109 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1110 const functions.][73862]
1111 - [The `#[track_caller]` attribute can now be added to functions to use the
1112 function's caller's location information for panic messages.][72445]
1113 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1114 `x.0.0` over `(x.0).0`.
1115 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1116 You currently can't use `mem::transmute` in constant functions.
1120 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1121 - [Enabled static "Position Independent Executables" by default
1122 for `x86_64-unknown-linux-musl`.][70740]
1126 - [`mem::forget` is now a `const fn`.][73887]
1127 - [`String` now implements `From<char>`.][73466]
1128 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1129 integer types.][73032]
1130 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1131 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1132 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1133 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1134 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1135 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1140 - [`vec::Drain::as_slice`]
1144 Added a number of new environment variables that are now available when
1145 compiling your crate.
1147 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1148 the specific binary being compiled and the name of the crate.
1149 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1150 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1154 - [The target configuration option `abi_blacklist` has been renamed
1155 to `unsupported_abis`.][74150] The old name will still continue to work.
1156 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1157 This was previously accepted but will become a hard error in a future release.
1158 - [Rustc will fail to compile if you have a struct with
1159 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1161 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1162 ensure that spans have the correct information, and may cause breakage if you
1163 were relying on receiving spans with dummy information.
1164 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1165 a legacy installer that was replaced by a MSI installer a few years ago but
1166 was still being built.
1167 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1168 - [Rustc will no longer accept overlapping trait implementations that only
1169 differ in how the lifetime was bound.][72493]
1170 - [Rustc now correctly relates the lifetime of an existential associated
1171 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1172 you to pass a shorter lifetime than expected.
1173 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1174 The library will need to be installed for `rustc` to work, even though we
1175 expect it to be already available on most systems.
1176 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1178 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1179 exact output returned by rustc's pretty printing is an unstable
1180 implementation detail: we recommend any macro relying on it to switch to a
1181 more robust parsing system.
1183 [75453]: https://github.com/rust-lang/rust/issues/75453/
1184 [74820]: https://github.com/rust-lang/rust/issues/74820/
1185 [74420]: https://github.com/rust-lang/rust/issues/74420/
1186 [74109]: https://github.com/rust-lang/rust/pull/74109/
1187 [74150]: https://github.com/rust-lang/rust/pull/74150/
1188 [73862]: https://github.com/rust-lang/rust/pull/73862/
1189 [73887]: https://github.com/rust-lang/rust/pull/73887/
1190 [73466]: https://github.com/rust-lang/rust/pull/73466/
1191 [73516]: https://github.com/rust-lang/rust/pull/73516/
1192 [73293]: https://github.com/rust-lang/rust/pull/73293/
1193 [73007]: https://github.com/rust-lang/rust/pull/73007/
1194 [73032]: https://github.com/rust-lang/rust/pull/73032/
1195 [72920]: https://github.com/rust-lang/rust/pull/72920/
1196 [72569]: https://github.com/rust-lang/rust/pull/72569/
1197 [72583]: https://github.com/rust-lang/rust/pull/72583/
1198 [72584]: https://github.com/rust-lang/rust/pull/72584/
1199 [72717]: https://github.com/rust-lang/rust/pull/72717/
1200 [72437]: https://github.com/rust-lang/rust/pull/72437/
1201 [72445]: https://github.com/rust-lang/rust/pull/72445/
1202 [72486]: https://github.com/rust-lang/rust/pull/72486/
1203 [72493]: https://github.com/rust-lang/rust/pull/72493/
1204 [72331]: https://github.com/rust-lang/rust/pull/72331/
1205 [71896]: https://github.com/rust-lang/rust/pull/71896/
1206 [71660]: https://github.com/rust-lang/rust/pull/71660/
1207 [71322]: https://github.com/rust-lang/rust/pull/71322/
1208 [70740]: https://github.com/rust-lang/rust/pull/70740/
1209 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1210 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1211 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1212 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1213 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1216 Version 1.45.2 (2020-08-03)
1217 ==========================
1219 * [Fix bindings in tuple struct patterns][74954]
1220 * [Fix track_caller integration with trait objects][74784]
1222 [74954]: https://github.com/rust-lang/rust/issues/74954
1223 [74784]: https://github.com/rust-lang/rust/issues/74784
1226 Version 1.45.1 (2020-07-30)
1227 ==========================
1229 * [Fix const propagation with references.][73613]
1230 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1231 * [Avoid spurious implicit region bound.][74509]
1232 * [Install clippy on x.py install][74457]
1234 [73613]: https://github.com/rust-lang/rust/pull/73613
1235 [73078]: https://github.com/rust-lang/rust/issues/73078
1236 [74509]: https://github.com/rust-lang/rust/pull/74509
1237 [74457]: https://github.com/rust-lang/rust/pull/74457
1240 Version 1.45.0 (2020-07-16)
1241 ==========================
1245 - [Out of range float to int conversions using `as` has been defined as a saturating
1246 conversion.][71269] This was previously undefined behaviour, but you can use the
1247 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1248 may be desirable in rare performance sensitive situations.
1249 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1250 using `u64`.][70705]
1251 - [Function like procedural macros can now be used in expression, pattern, and statement
1252 positions.][68717] This means you can now use a function-like procedural macro
1253 anywhere you can use a declarative (`macro_rules!`) macro.
1257 - [You can now override individual target features through the `target-feature`
1258 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1259 equivalent to `-C target-feature=+avx2,+fma`.
1260 - [Added the `force-unwind-tables` flag.][69984] This option allows
1261 rustc to always generate unwind tables regardless of panic strategy.
1262 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1263 to include LLVM bitcode into generated `rlib`s (this is on by default).
1264 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1265 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1266 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1267 - [Upgraded to LLVM 10.][67759]
1269 \* Refer to Rust's [platform support page][platform-support-doc] for more
1270 information on Rust's tiered platform support.
1275 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1277 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1278 - [You can now use `char` with
1279 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1280 a range of codepoints.][72413] E.g.
1281 you can now write the following;
1283 for ch in 'a'..='z' {
1287 // Prints "abcdefghijklmnopqrstuvwxyz"
1289 - [`OsString` now implements `FromStr`.][71662]
1290 - [The `saturating_neg` method has been added to all signed integer primitive
1291 types, and the `saturating_abs` method has been added for all integer
1292 primitive types.][71886]
1293 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1294 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1296 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1297 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1298 integer types.][69813]
1299 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1300 integer types.][72324]
1301 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1306 - [`BTreeMap::remove_entry`]
1308 - [`rc::Weak::as_ptr`]
1309 - [`rc::Weak::from_raw`]
1310 - [`rc::Weak::into_raw`]
1311 - [`str::strip_prefix`]
1312 - [`str::strip_suffix`]
1313 - [`sync::Weak::as_ptr`]
1314 - [`sync::Weak::from_raw`]
1315 - [`sync::Weak::into_raw`]
1316 - [`char::UNICODE_VERSION`]
1317 - [`Span::resolved_at`]
1318 - [`Span::located_at`]
1319 - [`Span::mixed_site`]
1320 - [`unix::process::CommandExt::arg0`]
1325 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1330 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1331 `~~outdated information~~` becomes "~~outdated information~~".
1332 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1336 - [Trying to self initialize a static value (that is creating a value using
1337 itself) is unsound and now causes a compile error.][71140]
1338 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1339 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1340 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1341 previously undocumented and not intended for public use. Rustdoc still provides
1342 a non-zero exit code on errors.
1343 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1344 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1345 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1346 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1347 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1351 - [Make clippy a git subtree instead of a git submodule][70655]
1352 - [Unify the undo log of all snapshot types][69464]
1354 [71848]: https://github.com/rust-lang/rust/issues/71848/
1355 [73420]: https://github.com/rust-lang/rust/issues/73420/
1356 [72324]: https://github.com/rust-lang/rust/pull/72324/
1357 [71843]: https://github.com/rust-lang/rust/pull/71843/
1358 [71886]: https://github.com/rust-lang/rust/pull/71886/
1359 [72234]: https://github.com/rust-lang/rust/pull/72234/
1360 [72239]: https://github.com/rust-lang/rust/pull/72239/
1361 [72397]: https://github.com/rust-lang/rust/pull/72397/
1362 [72413]: https://github.com/rust-lang/rust/pull/72413/
1363 [72014]: https://github.com/rust-lang/rust/pull/72014/
1364 [72062]: https://github.com/rust-lang/rust/pull/72062/
1365 [72094]: https://github.com/rust-lang/rust/pull/72094/
1366 [72133]: https://github.com/rust-lang/rust/pull/72133/
1367 [67759]: https://github.com/rust-lang/rust/pull/67759/
1368 [71900]: https://github.com/rust-lang/rust/pull/71900/
1369 [71928]: https://github.com/rust-lang/rust/pull/71928/
1370 [71662]: https://github.com/rust-lang/rust/pull/71662/
1371 [71716]: https://github.com/rust-lang/rust/pull/71716/
1372 [71447]: https://github.com/rust-lang/rust/pull/71447/
1373 [71269]: https://github.com/rust-lang/rust/pull/71269/
1374 [71095]: https://github.com/rust-lang/rust/pull/71095/
1375 [71140]: https://github.com/rust-lang/rust/pull/71140/
1376 [70655]: https://github.com/rust-lang/rust/pull/70655/
1377 [70705]: https://github.com/rust-lang/rust/pull/70705/
1378 [69984]: https://github.com/rust-lang/rust/pull/69984/
1379 [69813]: https://github.com/rust-lang/rust/pull/69813/
1380 [69464]: https://github.com/rust-lang/rust/pull/69464/
1381 [68717]: https://github.com/rust-lang/rust/pull/68717/
1382 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1383 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1384 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1385 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1386 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1387 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1388 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1389 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1390 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1391 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1392 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1393 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1394 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1395 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1396 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1397 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1398 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1401 Version 1.44.1 (2020-06-18)
1402 ===========================
1404 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1405 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1406 * [Fix crashes when finding backtrace on macOS.][71397]
1407 * [Clippy applies lint levels into different files.][clippy/5356]
1409 [71397]: https://github.com/rust-lang/rust/issues/71397
1410 [73078]: https://github.com/rust-lang/rust/issues/73078
1411 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1412 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1415 Version 1.44.0 (2020-06-04)
1416 ==========================
1420 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1421 - [Added the `unused_braces` lint.][70081]
1423 **Syntax-only changes**
1425 - [Expansion-driven outline module parsing][69838]
1430 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1435 These are still rejected semantically, so you will likely receive an error but
1436 these changes can be seen and parsed by macros and conditional compilation.
1440 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1441 Additionally when in incremental mode rustc defaults to 256 codegen units.
1442 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1443 a panic is thrown.][67502]
1444 - [Added tier 3\* support for the `aarch64-unknown-none` and
1445 `aarch64-unknown-none-softfloat` targets.][68334]
1446 - [Added tier 3 support for `arm64-apple-tvos` and
1447 `x86_64-apple-tvos` targets.][68191]
1452 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1453 `vec![]` to be able to be used in `const` contexts.
1454 - [`convert::Infallible` now implements `Hash`.][70281]
1455 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1456 a `&mut OsStr`.][70048]
1457 - [Unicode 13 is now supported.][69929]
1458 - [`String` now implements `From<&mut str>`.][69661]
1459 - [`IoSlice` now implements `Copy`.][69403]
1460 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1461 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1462 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1463 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1464 integer types.][69373]
1468 - [`PathBuf::with_capacity`]
1469 - [`PathBuf::capacity`]
1470 - [`PathBuf::clear`]
1471 - [`PathBuf::reserve`]
1472 - [`PathBuf::reserve_exact`]
1473 - [`PathBuf::shrink_to_fit`]
1474 - [`f32::to_int_unchecked`]
1475 - [`f64::to_int_unchecked`]
1476 - [`Layout::align_to`]
1477 - [`Layout::pad_to_align`]
1479 - [`Layout::extend`]
1483 - [Added the `cargo tree` command which will print a tree graph of
1484 your dependencies.][cargo/8062] E.g.
1486 mdbook v0.3.2 (/Users/src/rust/mdbook)
1488 │ ├── html5ever v0.24.0
1490 │ │ │ └── cfg-if v0.1.9
1492 │ │ └── markup5ever v0.9.0
1493 │ │ ├── log v0.4.8 (*)
1495 │ │ │ └── phf_shared v0.7.24
1496 │ │ │ ├── siphasher v0.2.3
1497 │ │ │ └── unicase v1.4.2
1498 │ │ │ [build-dependencies]
1499 │ │ │ └── version_check v0.1.5
1502 You can also display dependencies on multiple versions of the same crate with
1503 `cargo tree -d` (short for `cargo tree --duplicates`).
1507 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1508 the version in the sidebar.][69494]
1512 - [Rustc now correctly generates static libraries on Windows GNU targets with
1513 the `.a` extension, rather than the previous `.lib`.][70937]
1514 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1515 - [The `file_name` property in JSON output of macro errors now points the actual
1516 source file rather than the previous format of `<NAME macros>`.][70969]
1517 **Note:** this may not point to a file that actually exists on the user's system.
1518 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1519 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1520 not allow zero initialization such as `NonZeroU8`.][66059] This was
1521 previously a warning.
1522 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1523 operator has been defined as a saturating operation.][71269] This was previously
1524 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1525 continue using the current behaviour, which may be desirable in rare performance
1526 sensitive situations.
1530 These changes provide no direct user facing benefits, but represent significant
1531 improvements to the internals and overall performance of rustc and
1534 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1535 - [Replace big JS dict with JSON parsing.][71250]
1537 [69373]: https://github.com/rust-lang/rust/pull/69373/
1538 [66059]: https://github.com/rust-lang/rust/pull/66059/
1539 [68191]: https://github.com/rust-lang/rust/pull/68191/
1540 [68899]: https://github.com/rust-lang/rust/pull/68899/
1541 [71147]: https://github.com/rust-lang/rust/pull/71147/
1542 [71250]: https://github.com/rust-lang/rust/pull/71250/
1543 [70937]: https://github.com/rust-lang/rust/pull/70937/
1544 [70969]: https://github.com/rust-lang/rust/pull/70969/
1545 [70632]: https://github.com/rust-lang/rust/pull/70632/
1546 [70281]: https://github.com/rust-lang/rust/pull/70281/
1547 [70345]: https://github.com/rust-lang/rust/pull/70345/
1548 [70048]: https://github.com/rust-lang/rust/pull/70048/
1549 [70081]: https://github.com/rust-lang/rust/pull/70081/
1550 [70156]: https://github.com/rust-lang/rust/pull/70156/
1551 [71269]: https://github.com/rust-lang/rust/pull/71269/
1552 [69838]: https://github.com/rust-lang/rust/pull/69838/
1553 [69929]: https://github.com/rust-lang/rust/pull/69929/
1554 [69661]: https://github.com/rust-lang/rust/pull/69661/
1555 [69778]: https://github.com/rust-lang/rust/pull/69778/
1556 [69494]: https://github.com/rust-lang/rust/pull/69494/
1557 [69403]: https://github.com/rust-lang/rust/pull/69403/
1558 [69033]: https://github.com/rust-lang/rust/pull/69033/
1559 [68692]: https://github.com/rust-lang/rust/pull/68692/
1560 [68334]: https://github.com/rust-lang/rust/pull/68334/
1561 [67502]: https://github.com/rust-lang/rust/pull/67502/
1562 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1563 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1564 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1565 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1566 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1567 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1568 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1569 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1570 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1571 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1572 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1573 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1574 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1577 Version 1.43.1 (2020-05-07)
1578 ===========================
1580 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1581 * [Fixed the stabilization of AVX-512 features.][71473]
1582 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1584 [71430]: https://github.com/rust-lang/rust/pull/71430
1585 [71473]: https://github.com/rust-lang/rust/issues/71473
1586 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1589 Version 1.43.0 (2020-04-23)
1590 ==========================
1594 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1595 the type inferred correctly.][68129]
1596 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1598 **Syntax only changes**
1599 - [Allow `type Foo: Ord` syntactically.][69361]
1600 - [Fuse associated and extern items up to defaultness.][69194]
1601 - [Syntactically allow `self` in all `fn` contexts.][68764]
1602 - [Merge `fn` syntax + cleanup item parsing.][68728]
1603 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1604 For example, you may now write:
1606 macro_rules! mac_trait {
1616 These are still rejected *semantically*, so you will likely receive an error but
1617 these changes can be seen and parsed by macros and
1618 conditional compilation.
1623 - [You can now pass multiple lint flags to rustc to override the previous
1624 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1625 everything in the `unused` lint group except `unused-variables` which
1626 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1627 everything in the `unused` lint group **including** `unused-variables` since
1628 the allow flag is specified before the deny flag (and therefore overridden).
1629 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1630 if they are available on `windows-gnu`.][67429]
1631 - [rustc now buffers errors/warnings printed in JSON.][69227]
1635 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1636 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1637 respectively.][69538] **Note** These conversions are only available when `N`
1639 - [You can now use associated constants on floats and integers directly, rather
1640 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1641 `f32::NAN` with no imports.
1642 - [`u8::is_ascii` is now `const`.][68984]
1643 - [`String` now implements `AsMut<str>`.][68742]
1644 - [Added the `primitive` module to `std` and `core`.][67637] This module
1645 reexports Rust's primitive types. This is mainly useful in macros
1646 where you want avoid these types being shadowed.
1647 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1648 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1652 - [`Once::is_completed`]
1657 - [`iter::once_with`]
1661 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1662 your environment.][cargo/7823]
1663 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1664 executable path when running integration tests or benchmarks.][cargo/7697]
1665 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1666 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1670 - [Certain checks in the `const_err` lint were deemed unrelated to const
1671 evaluation][69185], and have been moved to the `unconditional_panic` and
1672 `arithmetic_overflow` lints.
1677 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1678 has been a warning since 1.36.0.
1679 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1680 led to some instances being accepted, and now correctly emits a hard error.
1682 [69340]: https://github.com/rust-lang/rust/pull/69340
1686 These changes provide no direct user facing benefits, but represent significant
1687 improvements to the internals and overall performance of `rustc` and
1690 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1691 - [Improved how rustc generates drop code.][67332]
1692 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1693 - [traits: preallocate 2 Vecs of known initial size][69022]
1694 - [Avoid exponential behaviour when relating types][68772]
1695 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1696 - [Improve performance of coherence checks][68966]
1697 - [Deduplicate types in the generator witness][68672]
1698 - [Invert control in struct_lint_level.][68725]
1700 [67332]: https://github.com/rust-lang/rust/pull/67332/
1701 [67429]: https://github.com/rust-lang/rust/pull/67429/
1702 [67637]: https://github.com/rust-lang/rust/pull/67637/
1703 [67642]: https://github.com/rust-lang/rust/pull/67642/
1704 [67878]: https://github.com/rust-lang/rust/pull/67878/
1705 [67885]: https://github.com/rust-lang/rust/pull/67885/
1706 [68129]: https://github.com/rust-lang/rust/pull/68129/
1707 [68672]: https://github.com/rust-lang/rust/pull/68672/
1708 [68725]: https://github.com/rust-lang/rust/pull/68725/
1709 [68728]: https://github.com/rust-lang/rust/pull/68728/
1710 [68738]: https://github.com/rust-lang/rust/pull/68738/
1711 [68742]: https://github.com/rust-lang/rust/pull/68742/
1712 [68764]: https://github.com/rust-lang/rust/pull/68764/
1713 [68772]: https://github.com/rust-lang/rust/pull/68772/
1714 [68943]: https://github.com/rust-lang/rust/pull/68943/
1715 [68952]: https://github.com/rust-lang/rust/pull/68952/
1716 [68966]: https://github.com/rust-lang/rust/pull/68966/
1717 [68984]: https://github.com/rust-lang/rust/pull/68984/
1718 [69022]: https://github.com/rust-lang/rust/pull/69022/
1719 [69185]: https://github.com/rust-lang/rust/pull/69185/
1720 [69194]: https://github.com/rust-lang/rust/pull/69194/
1721 [69201]: https://github.com/rust-lang/rust/pull/69201/
1722 [69227]: https://github.com/rust-lang/rust/pull/69227/
1723 [69548]: https://github.com/rust-lang/rust/pull/69548/
1724 [69256]: https://github.com/rust-lang/rust/pull/69256/
1725 [69361]: https://github.com/rust-lang/rust/pull/69361/
1726 [69366]: https://github.com/rust-lang/rust/pull/69366/
1727 [69538]: https://github.com/rust-lang/rust/pull/69538/
1728 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1729 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1730 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1731 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1732 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1733 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1734 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1735 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1738 Version 1.42.0 (2020-03-12)
1739 ==========================
1743 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1745 fn foo(words: &[&str]) {
1747 ["Hello", "World", "!", ..] => println!("Hello World!"),
1748 ["Foo", "Bar", ..] => println!("Baz"),
1749 rest => println!("{:?}", rest),
1753 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1754 that you can create an enum that has the exact layout and ABI of the type
1756 - [There are some *syntax-only* changes:][67131]
1757 - `default` is syntactically allowed before items in `trait` definitions.
1758 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1759 leave out their bodies in favor of `;`.
1760 - Bounds on associated types in `impl`s are now syntactically allowed
1761 (e.g. `type Foo: Ord;`).
1762 - `...` (the C-variadic type) may occur syntactically directly as the type of
1763 any function parameter.
1765 These are still rejected *semantically*, so you will likely receive an error
1766 but these changes can be seen and parsed by procedural macros and
1767 conditional compilation.
1771 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1772 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1773 - [`Option::{expect,unwrap}` and
1774 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1775 pointing to the location where they were called, rather than
1776 `core`'s internals. ][67887]
1778 \* Refer to Rust's [platform support page][platform-support-doc] for more
1779 information on Rust's tiered platform support.
1783 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1784 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1785 to implement `Sized`.][67935]
1786 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1787 - [`Layout::new` is now `const`.][66254]
1788 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1793 - [`CondVar::wait_while`]
1794 - [`CondVar::wait_timeout_while`]
1796 - [`DebugMap::value`]
1797 - [`ManuallyDrop::take`]
1799 - [`ptr::slice_from_raw_parts_mut`]
1800 - [`ptr::slice_from_raw_parts`]
1804 - [You no longer need to include `extern crate proc_macro;` to be able to
1805 `use proc_macro;` in the `2018` edition.][cargo/7700]
1809 - [`Error::description` has been deprecated, and its use will now produce a
1810 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1812 [68253]: https://github.com/rust-lang/rust/pull/68253/
1813 [68348]: https://github.com/rust-lang/rust/pull/68348/
1814 [67935]: https://github.com/rust-lang/rust/pull/67935/
1815 [68339]: https://github.com/rust-lang/rust/pull/68339/
1816 [68122]: https://github.com/rust-lang/rust/pull/68122/
1817 [67712]: https://github.com/rust-lang/rust/pull/67712/
1818 [67887]: https://github.com/rust-lang/rust/pull/67887/
1819 [67131]: https://github.com/rust-lang/rust/pull/67131/
1820 [67233]: https://github.com/rust-lang/rust/pull/67233/
1821 [66899]: https://github.com/rust-lang/rust/pull/66899/
1822 [66919]: https://github.com/rust-lang/rust/pull/66919/
1823 [66254]: https://github.com/rust-lang/rust/pull/66254/
1824 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1825 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1826 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1827 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1828 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1829 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1830 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1831 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1832 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1835 Version 1.41.1 (2020-02-27)
1836 ===========================
1838 * [Always check types of static items][69145]
1839 * [Always check lifetime bounds of `Copy` impls][69145]
1840 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1842 [69225]: https://github.com/rust-lang/rust/issues/69225
1843 [69145]: https://github.com/rust-lang/rust/pull/69145
1846 Version 1.41.0 (2020-01-30)
1847 ===========================
1852 - [You can now pass type parameters to foreign items when implementing
1853 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1854 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1855 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1856 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1857 - [You can now use any valid identifier in a `format_args` macro.][66847]
1858 Previously identifiers starting with an underscore were not allowed.
1859 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1860 enum variants.][66183] These are still rejected semantically, but
1861 can be seen and parsed by procedural macros and conditional compilation.
1866 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1867 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1868 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1869 - [You can now pass an arguments file passing the `@path` syntax
1870 to rustc.][66172] Note that the format differs somewhat from what is
1871 found in other tooling; please see [the documentation][argfile-docs] for
1873 - [You can now provide `--extern` flag without a path, indicating that it is
1874 available from the search path or specified with an `-L` flag.][64882]
1876 \* Refer to Rust's [platform support page][platform-support-doc] for more
1877 information on Rust's tiered platform support.
1879 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1884 - [The `core::panic` module is now stable.][66771] It was already stable
1886 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1887 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1888 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1893 - [`Result::map_or`]
1894 - [`Result::map_or_else`]
1895 - [`std::rc::Weak::weak_count`]
1896 - [`std::rc::Weak::strong_count`]
1897 - [`std::sync::Weak::weak_count`]
1898 - [`std::sync::Weak::strong_count`]
1903 - [Cargo will now document all the private items for binary crates
1904 by default.][cargo/7593]
1905 - [`cargo-install` will now reinstall the package if it detects that it is out
1906 of date.][cargo/7560]
1907 - [Cargo.lock now uses a more git friendly format that should help to reduce
1908 merge conflicts.][cargo/7579]
1909 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1910 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1911 optimisation level to `2` for debug builds. You can also use
1912 `[profile.<profile>.build-override]` to override build scripts and
1918 - [You can now specify `edition` in documentation code blocks to compile the block
1919 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1920 should be compiled the 2018 edition of Rust.
1921 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1922 current theme with `--check-theme`.][54733]
1923 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1928 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1929 Apple targets.][apple-32bit-drop] This means that the source code is still
1930 available to build, but the targets are no longer being tested and release
1931 binaries for those platforms will no longer be distributed by the Rust project.
1932 Please refer to the linked blog post for more information.
1934 [54733]: https://github.com/rust-lang/rust/pull/54733/
1935 [61351]: https://github.com/rust-lang/rust/pull/61351/
1936 [67255]: https://github.com/rust-lang/rust/pull/67255/
1937 [66661]: https://github.com/rust-lang/rust/pull/66661/
1938 [66771]: https://github.com/rust-lang/rust/pull/66771/
1939 [66847]: https://github.com/rust-lang/rust/pull/66847/
1940 [66238]: https://github.com/rust-lang/rust/pull/66238/
1941 [66277]: https://github.com/rust-lang/rust/pull/66277/
1942 [66325]: https://github.com/rust-lang/rust/pull/66325/
1943 [66172]: https://github.com/rust-lang/rust/pull/66172/
1944 [66183]: https://github.com/rust-lang/rust/pull/66183/
1945 [65879]: https://github.com/rust-lang/rust/pull/65879/
1946 [65013]: https://github.com/rust-lang/rust/pull/65013/
1947 [64882]: https://github.com/rust-lang/rust/pull/64882/
1948 [64325]: https://github.com/rust-lang/rust/pull/64325/
1949 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1950 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1951 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1952 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1953 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1954 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1955 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1956 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1957 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1958 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1959 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1961 Version 1.40.0 (2019-12-19)
1962 ===========================
1966 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1967 `const` contexts.][65188] e.g.
1970 pub struct Point(i32, i32);
1972 const ORIGIN: Point = {
1973 let constructor = Point;
1979 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1980 indicate that there may be variants or fields added in the future.][64639]
1981 For example this requires adding a wild-card branch (`_ => {}`) to any match
1982 statements on a non-exhaustive `enum`. [(RFC 2008)]
1983 - [You can now use function-like procedural macros in `extern` blocks and in
1984 type positions.][63931] e.g. `type Generated = macro!();`
1985 - [Function-like and attribute procedural macros can now emit
1986 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1987 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1988 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1989 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1993 - [Added tier 3 support\* for the
1994 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1995 - [Added tier 3 support for the
1996 `aarch64-unknown-none-softfloat` target.][64589]
1997 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1998 `mips64el-unknown-linux-muslabi64` targets.][65843]
2000 \* Refer to Rust's [platform support page][platform-support-doc] for more
2001 information on Rust's tiered platform support.
2005 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2009 - [`BTreeMap::get_key_value`]
2010 - [`HashMap::get_key_value`]
2011 - [`Option::as_deref_mut`]
2012 - [`Option::as_deref`]
2013 - [`Option::flatten`]
2014 - [`UdpSocket::peer_addr`]
2015 - [`f32::to_be_bytes`]
2016 - [`f32::to_le_bytes`]
2017 - [`f32::to_ne_bytes`]
2018 - [`f64::to_be_bytes`]
2019 - [`f64::to_le_bytes`]
2020 - [`f64::to_ne_bytes`]
2021 - [`f32::from_be_bytes`]
2022 - [`f32::from_le_bytes`]
2023 - [`f32::from_ne_bytes`]
2024 - [`f64::from_be_bytes`]
2025 - [`f64::from_le_bytes`]
2026 - [`f64::from_ne_bytes`]
2033 - [Cargo will now always display warnings, rather than only on
2034 fresh builds.][cargo/7450]
2035 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2036 now produce an error.][cargo/7507] Previously these flags were ignored.
2037 - [You can now publish `dev-dependencies` without including
2038 a `version`.][cargo/7333]
2042 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2043 when running documentation tests with `rustdoc`.][63803]
2047 - [As previously announced, any previous NLL warnings in the 2015 edition are
2048 now hard errors.][64221]
2049 - [The `include!` macro will now warn if it failed to include the
2050 entire file.][64284] The `include!` macro unintentionally only includes the
2051 first _expression_ in a file, and this can be unintuitive. This will become
2052 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2053 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2054 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2055 or `extern` blocks now correctly emits a hard error.
2057 [65294]: https://github.com/rust-lang/rust/pull/65294/
2058 [66103]: https://github.com/rust-lang/rust/pull/66103/
2059 [65843]: https://github.com/rust-lang/rust/pull/65843/
2060 [65188]: https://github.com/rust-lang/rust/pull/65188/
2061 [65092]: https://github.com/rust-lang/rust/pull/65092/
2062 [64589]: https://github.com/rust-lang/rust/pull/64589/
2063 [64639]: https://github.com/rust-lang/rust/pull/64639/
2064 [64221]: https://github.com/rust-lang/rust/pull/64221/
2065 [64284]: https://github.com/rust-lang/rust/pull/64284/
2066 [63931]: https://github.com/rust-lang/rust/pull/63931/
2067 [64035]: https://github.com/rust-lang/rust/pull/64035/
2068 [63674]: https://github.com/rust-lang/rust/pull/63674/
2069 [63803]: https://github.com/rust-lang/rust/pull/63803/
2070 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2071 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2072 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2073 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2074 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2075 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2076 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2077 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2078 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2079 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2080 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2081 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2082 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2083 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2084 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2085 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2086 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2087 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2088 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2089 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2090 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2091 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2092 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2093 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2094 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2095 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2098 Version 1.39.0 (2019-11-07)
2099 ===========================
2103 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2104 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2105 - [You can now use certain attributes on function, closure, and function pointer
2106 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2107 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2108 attributes applied to items. e.g.
2111 #[cfg(windows)] slice: &[u16],
2112 #[cfg(not(windows))] slice: &[u8],
2117 - [You can now take shared references to bind-by-move patterns in the `if` guards
2118 of `match` arms.][63118] e.g.
2121 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2125 // ---- `nums` is bound by move.
2126 if nums.iter().sum::<u8>() == 10
2127 // ^------ `.iter()` implicitly takes a reference to `nums`.
2130 // ----------- Legal as `nums` was bound by move and so we have ownership.
2132 _ => unreachable!(),
2141 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2142 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2143 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2144 **Note** Cargo currently doesn't use this feature. Refer to
2145 [cargo#7315][cargo/7315] to track this feature's progress.
2146 - [You can now pass `--show-output` argument to test binaries to print the
2147 output of successful tests.][62600]
2150 \* Refer to Rust's [platform support page][platform-support-doc] for more
2151 information on Rust's tiered platform support.
2155 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2156 - [`LinkedList::new` is now a `const` function.][63684]
2157 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2158 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2159 now `const`.][63786]
2163 - [`Pin::into_inner`]
2164 - [`Instant::checked_duration_since`]
2165 - [`Instant::saturating_duration_since`]
2169 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2170 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2171 `--all` is now deprecated.
2175 - [You can now pass `-Clinker` to rustdoc to control the linker used
2176 for compiling doctests.][63834]
2180 - [Code that was previously accepted by the old borrow checker, but rejected by
2181 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2182 previously a warning, and will also become a hard error in the Rust 2015
2183 edition in the 1.40.0 release.
2184 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2185 run tests.][63827] This should improve performance when running a large
2187 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2188 recommended to use the `?` operator instead.
2189 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2192 [62600]: https://github.com/rust-lang/rust/pull/62600/
2193 [62672]: https://github.com/rust-lang/rust/pull/62672/
2194 [63118]: https://github.com/rust-lang/rust/pull/63118/
2195 [63209]: https://github.com/rust-lang/rust/pull/63209/
2196 [63402]: https://github.com/rust-lang/rust/pull/63402/
2197 [63565]: https://github.com/rust-lang/rust/pull/63565/
2198 [63595]: https://github.com/rust-lang/rust/pull/63595/
2199 [63684]: https://github.com/rust-lang/rust/pull/63684/
2200 [63698]: https://github.com/rust-lang/rust/pull/63698/
2201 [63770]: https://github.com/rust-lang/rust/pull/63770/
2202 [63786]: https://github.com/rust-lang/rust/pull/63786/
2203 [63827]: https://github.com/rust-lang/rust/pull/63827/
2204 [63834]: https://github.com/rust-lang/rust/pull/63834/
2205 [63927]: https://github.com/rust-lang/rust/pull/63927/
2206 [63933]: https://github.com/rust-lang/rust/pull/63933/
2207 [63934]: https://github.com/rust-lang/rust/pull/63934/
2208 [63938]: https://github.com/rust-lang/rust/pull/63938/
2209 [63940]: https://github.com/rust-lang/rust/pull/63940/
2210 [63941]: https://github.com/rust-lang/rust/pull/63941/
2211 [63945]: https://github.com/rust-lang/rust/pull/63945/
2212 [64010]: https://github.com/rust-lang/rust/pull/64010/
2213 [64028]: https://github.com/rust-lang/rust/pull/64028/
2214 [64334]: https://github.com/rust-lang/rust/pull/64334/
2215 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2216 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2217 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2218 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2219 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2220 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2222 Version 1.38.0 (2019-09-26)
2223 ==========================
2227 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2228 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2232 - [Added pipelined compilation support to `rustc`.][62766] This will
2233 improve compilation times in some cases. For further information please refer
2234 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2235 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2236 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2237 `x86_64-uwp-windows-msvc` targets.][60260]
2238 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2239 `armv7-unknown-linux-musleabi` targets.][63107]
2240 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2241 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2242 - [Upgraded to LLVM 9.][62592]
2244 \* Refer to Rust's [platform support page][platform-support-doc] for more
2245 information on Rust's tiered platform support.
2249 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2250 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2251 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2252 is available at `std::clone::Clone`). This also makes all built-in macros
2253 available in `std`/`core` root. e.g. `std::include_bytes!`.
2254 - [`str::Chars` now implements `Debug`.][63000]
2255 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2256 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2257 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2258 - [Added euclidean remainder and division operations (`div_euclid`,
2259 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2260 `overflowing`, and `wrapping` versions are available for all
2262 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2263 `PartialEq`.][61491]
2264 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2268 - [`<*const T>::cast`]
2269 - [`<*mut T>::cast`]
2270 - [`Duration::as_secs_f32`]
2271 - [`Duration::as_secs_f64`]
2272 - [`Duration::div_f32`]
2273 - [`Duration::div_f64`]
2274 - [`Duration::from_secs_f32`]
2275 - [`Duration::from_secs_f64`]
2276 - [`Duration::mul_f32`]
2277 - [`Duration::mul_f64`]
2278 - [`any::type_name`]
2282 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2283 - [You can now pass the `--features` option multiple times to enable
2284 multiple features.][cargo/7084]
2289 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2293 - [`rustc` will now warn about some incorrect uses of
2294 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2298 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2300 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2301 issues][62896] with certain crates such as libc.
2303 [60260]: https://github.com/rust-lang/rust/pull/60260/
2304 [61457]: https://github.com/rust-lang/rust/pull/61457/
2305 [61491]: https://github.com/rust-lang/rust/pull/61491/
2306 [61884]: https://github.com/rust-lang/rust/pull/61884/
2307 [61953]: https://github.com/rust-lang/rust/pull/61953/
2308 [62042]: https://github.com/rust-lang/rust/pull/62042/
2309 [62528]: https://github.com/rust-lang/rust/pull/62528/
2310 [62583]: https://github.com/rust-lang/rust/pull/62583/
2311 [62735]: https://github.com/rust-lang/rust/pull/62735/
2312 [62766]: https://github.com/rust-lang/rust/pull/62766/
2313 [62784]: https://github.com/rust-lang/rust/pull/62784/
2314 [62592]: https://github.com/rust-lang/rust/pull/62592/
2315 [62785]: https://github.com/rust-lang/rust/issues/62785/
2316 [62814]: https://github.com/rust-lang/rust/pull/62814/
2317 [62896]: https://github.com/rust-lang/rust/issues/62896/
2318 [63000]: https://github.com/rust-lang/rust/pull/63000/
2319 [63056]: https://github.com/rust-lang/rust/pull/63056/
2320 [63107]: https://github.com/rust-lang/rust/pull/63107/
2321 [63346]: https://github.com/rust-lang/rust/pull/63346/
2322 [63421]: https://github.com/rust-lang/rust/pull/63421/
2323 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2324 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2325 [63048]: https://github.com/rust-lang/rust/pull/63048
2326 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2327 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2328 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2329 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2330 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2331 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2332 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2333 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2334 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2335 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2336 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2337 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2338 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2340 Version 1.37.0 (2019-08-15)
2341 ==========================
2345 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2346 [`Box`][62228], or an [array][62235] and unused.
2347 - [You can now use the `cfg` and `cfg_attr` attributes on
2348 generic parameters.][61547]
2349 - [You can now use enum variants through type alias.][61682] e.g. You can
2350 write the following:
2352 type MyOption = Option<u8>;
2354 fn increment_or_zero(x: MyOption) -> u8 {
2356 MyOption::Some(y) => y + 1,
2357 MyOption::None => 0,
2361 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2362 `const _: u32 = 5;`.
2363 - [You can now use `#[repr(align(X)]` on enums.][61229]
2364 - [The `?` Kleene macro operator is now available in the
2365 2015 edition.][60932]
2369 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2370 and `-C profile-use` flags.][61268] For more information on how to use profile
2371 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2372 - [The `rust-lldb` wrapper script should now work again.][61827]
2376 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2380 - [`BufReader::buffer`]
2381 - [`BufWriter::buffer`]
2382 - [`Cell::from_mut`]
2383 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2384 - [`DoubleEndedIterator::nth_back`]
2386 - [`Wrapping::reverse_bits`]
2387 - [`i128::reverse_bits`]
2388 - [`i16::reverse_bits`]
2389 - [`i32::reverse_bits`]
2390 - [`i64::reverse_bits`]
2391 - [`i8::reverse_bits`]
2392 - [`isize::reverse_bits`]
2393 - [`slice::copy_within`]
2394 - [`u128::reverse_bits`]
2395 - [`u16::reverse_bits`]
2396 - [`u32::reverse_bits`]
2397 - [`u64::reverse_bits`]
2398 - [`u8::reverse_bits`]
2399 - [`usize::reverse_bits`]
2403 - [`Cargo.lock` files are now included by default when publishing executable crates
2404 with executables.][cargo/7026]
2405 - [You can now specify `default-run="foo"` in `[package]` to specify the
2406 default executable to use for `cargo run`.][cargo/7056]
2413 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2414 Please transition your code to using the `..=` syntax for inclusive
2416 - [Using a trait object without the `dyn` will now warn by default.][61203]
2417 Please transition your code to use `dyn Trait` for trait objects instead.
2419 [62228]: https://github.com/rust-lang/rust/pull/62228/
2420 [62235]: https://github.com/rust-lang/rust/pull/62235/
2421 [61802]: https://github.com/rust-lang/rust/pull/61802/
2422 [61827]: https://github.com/rust-lang/rust/pull/61827/
2423 [61547]: https://github.com/rust-lang/rust/pull/61547/
2424 [61682]: https://github.com/rust-lang/rust/pull/61682/
2425 [61268]: https://github.com/rust-lang/rust/pull/61268/
2426 [61342]: https://github.com/rust-lang/rust/pull/61342/
2427 [61347]: https://github.com/rust-lang/rust/pull/61347/
2428 [61100]: https://github.com/rust-lang/rust/pull/61100/
2429 [61203]: https://github.com/rust-lang/rust/pull/61203/
2430 [61229]: https://github.com/rust-lang/rust/pull/61229/
2431 [60932]: https://github.com/rust-lang/rust/pull/60932/
2432 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2433 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2434 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2435 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2436 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2437 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2438 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2439 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2440 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2441 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2442 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2443 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2444 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2445 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2446 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2447 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2448 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2449 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2450 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2451 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2452 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2453 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2454 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2455 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2458 Version 1.36.0 (2019-07-04)
2459 ==========================
2463 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2464 - [The order of traits in trait objects no longer affects the semantics of that
2465 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2466 `dyn fmt::Debug + Send`, where this was previously not the case.
2470 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2471 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2472 - [`mem::needs_drop` is now available as a const fn.][60364]
2473 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2474 - [`String` now implements `BorrowMut<str>`.][60404]
2475 - [`io::Cursor` now implements `Default`.][60234]
2476 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2477 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2478 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2479 environment has access to heap memory allocation.
2480 - [`String` now implements `From<&String>`.][59825]
2481 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2482 return a tuple of each argument when there is multiple arguments.
2483 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2488 - [`VecDeque::rotate_left`]
2489 - [`VecDeque::rotate_right`]
2490 - [`Iterator::copied`]
2492 - [`io::IoSliceMut`]
2493 - [`Read::read_vectored`]
2494 - [`Write::write_vectored`]
2495 - [`str::as_mut_ptr`]
2496 - [`mem::MaybeUninit`]
2497 - [`pointer::align_offset`]
2498 - [`future::Future`]
2500 - [`task::RawWaker`]
2501 - [`task::RawWakerVTable`]
2507 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2508 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2510 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2514 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2521 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2522 longer recommended, and will be deprecated in 1.39.0.
2524 [60318]: https://github.com/rust-lang/rust/pull/60318/
2525 [60364]: https://github.com/rust-lang/rust/pull/60364/
2526 [60370]: https://github.com/rust-lang/rust/pull/60370/
2527 [60404]: https://github.com/rust-lang/rust/pull/60404/
2528 [60234]: https://github.com/rust-lang/rust/pull/60234/
2529 [60244]: https://github.com/rust-lang/rust/pull/60244/
2530 [58623]: https://github.com/rust-lang/rust/pull/58623/
2531 [59648]: https://github.com/rust-lang/rust/pull/59648/
2532 [59675]: https://github.com/rust-lang/rust/pull/59675/
2533 [59825]: https://github.com/rust-lang/rust/pull/59825/
2534 [59826]: https://github.com/rust-lang/rust/pull/59826/
2535 [59445]: https://github.com/rust-lang/rust/pull/59445/
2536 [59114]: https://github.com/rust-lang/rust/pull/59114/
2537 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2538 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2539 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2540 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2541 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2542 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2543 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2544 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2545 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2546 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2547 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2548 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2549 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2550 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2551 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2552 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2553 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2554 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2555 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2556 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2559 Version 1.35.0 (2019-05-23)
2560 ==========================
2564 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2565 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2566 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2568 unsafe fn call_unsafe(func: unsafe fn()) {
2573 unsafe { call_unsafe(|| {}); }
2580 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2581 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2582 - [Added the `wasm32-unknown-wasi` target.][59464]
2587 - [`Thread` will now show its ID in `Debug` output.][59460]
2588 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2589 - [`alloc::System` now implements `Default`.][59451]
2590 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2592 - [`char::{ToLowercase, ToUppercase}` now
2593 implement `ExactSizeIterator`.][58778]
2594 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2595 - [Removed the `Read` trait bounds
2596 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2597 - [You can now call the `dbg!` macro without any parameters to print the file
2598 and line where it is called.][57847]
2599 - [In place ASCII case conversions are now up to 4× faster.][59283]
2600 e.g. `str::make_ascii_lowercase`
2601 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2608 - [`RefCell::replace_with`]
2609 - [`RefCell::map_split`]
2611 - [`Range::contains`]
2612 - [`RangeFrom::contains`]
2613 - [`RangeTo::contains`]
2614 - [`RangeInclusive::contains`]
2615 - [`RangeToInclusive::contains`]
2616 - [`Option::copied`]
2620 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2621 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2626 - [The Rust toolchain is now available natively for musl based distros.][58575]
2628 [59460]: https://github.com/rust-lang/rust/pull/59460/
2629 [59464]: https://github.com/rust-lang/rust/pull/59464/
2630 [59500]: https://github.com/rust-lang/rust/pull/59500/
2631 [59512]: https://github.com/rust-lang/rust/pull/59512/
2632 [59580]: https://github.com/rust-lang/rust/pull/59580/
2633 [59283]: https://github.com/rust-lang/rust/pull/59283/
2634 [59451]: https://github.com/rust-lang/rust/pull/59451/
2635 [59076]: https://github.com/rust-lang/rust/pull/59076/
2636 [58778]: https://github.com/rust-lang/rust/pull/58778/
2637 [58717]: https://github.com/rust-lang/rust/pull/58717/
2638 [58369]: https://github.com/rust-lang/rust/pull/58369/
2639 [58423]: https://github.com/rust-lang/rust/pull/58423/
2640 [58080]: https://github.com/rust-lang/rust/pull/58080/
2641 [57847]: https://github.com/rust-lang/rust/pull/57847/
2642 [58575]: https://github.com/rust-lang/rust/pull/58575
2643 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2644 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2645 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2646 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2647 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2648 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2649 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2650 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2651 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2652 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2653 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2654 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2656 Version 1.34.2 (2019-05-14)
2657 ===========================
2659 * [Destabilize the `Error::type_id` function due to a security
2660 vulnerability][60785] ([CVE-2019-12083])
2662 [60785]: https://github.com/rust-lang/rust/pull/60785
2663 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2665 Version 1.34.1 (2019-04-25)
2666 ===========================
2668 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2669 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2670 * [Fix Clippy panic when checking some macros][clippy/3805]
2672 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2673 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2674 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2676 Version 1.34.0 (2019-04-11)
2677 ==========================
2681 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2682 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2684 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2685 `#[attr{}]` procedural macros.][57367]
2686 - [You can now write `extern crate self as foo;`][57407] to import your
2687 crate's root into the extern prelude.
2692 - [You can now target `riscv64imac-unknown-none-elf` and
2693 `riscv64gc-unknown-none-elf`.][58406]
2694 - [You can now enable linker plugin LTO optimisations with
2695 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2696 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2698 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2703 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2704 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2705 the `Hash` trait to create an iterator.
2706 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2707 methods.][58421] Most notably you no longer require the `Ord` trait to create
2709 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2710 for all numeric types.][58044]
2711 - [Indexing a `str` is now generic over all types that
2712 implement `SliceIndex<str>`.][57604]
2713 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2714 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2715 produce a warning if their returning type is unused.
2716 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2717 `overflowing_pow` are now available for all numeric types.][57873] These are
2718 equivalent to methods such as `wrapping_add` for the `pow` operation.
2726 * [`Error::type_id`]
2727 * [`atomic::AtomicI16`]
2728 * [`atomic::AtomicI32`]
2729 * [`atomic::AtomicI64`]
2730 * [`atomic::AtomicI8`]
2731 * [`atomic::AtomicU16`]
2732 * [`atomic::AtomicU32`]
2733 * [`atomic::AtomicU64`]
2734 * [`atomic::AtomicU8`]
2735 * [`convert::Infallible`]
2736 * [`convert::TryFrom`]
2737 * [`convert::TryInto`]
2739 * [`iter::successors`]
2740 * [`num::NonZeroI128`]
2741 * [`num::NonZeroI16`]
2742 * [`num::NonZeroI32`]
2743 * [`num::NonZeroI64`]
2744 * [`num::NonZeroI8`]
2745 * [`num::NonZeroIsize`]
2746 * [`slice::sort_by_cached_key`]
2747 * [`str::escape_debug`]
2748 * [`str::escape_default`]
2749 * [`str::escape_unicode`]
2750 * [`str::split_ascii_whitespace`]
2753 * [`Instant::checked_add`]
2754 * [`Instant::checked_sub`]
2755 * [`SystemTime::checked_add`]
2756 * [`SystemTime::checked_sub`]
2760 - [You can now use alternative registries to crates.io.][cargo/6654]
2764 - [You can now use the `?` operator in your documentation tests without manually
2765 adding `fn main() -> Result<(), _> {}`.][56470]
2769 - [`Command::before_exec` is being replaced by the unsafe method
2770 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2771 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2772 can now use `const` functions in `static` variables.
2774 [58370]: https://github.com/rust-lang/rust/pull/58370/
2775 [58406]: https://github.com/rust-lang/rust/pull/58406/
2776 [58421]: https://github.com/rust-lang/rust/pull/58421/
2777 [58166]: https://github.com/rust-lang/rust/pull/58166/
2778 [58044]: https://github.com/rust-lang/rust/pull/58044/
2779 [58057]: https://github.com/rust-lang/rust/pull/58057/
2780 [58059]: https://github.com/rust-lang/rust/pull/58059/
2781 [57809]: https://github.com/rust-lang/rust/pull/57809/
2782 [57873]: https://github.com/rust-lang/rust/pull/57873/
2783 [57604]: https://github.com/rust-lang/rust/pull/57604/
2784 [57367]: https://github.com/rust-lang/rust/pull/57367/
2785 [57407]: https://github.com/rust-lang/rust/pull/57407/
2786 [57425]: https://github.com/rust-lang/rust/pull/57425/
2787 [57106]: https://github.com/rust-lang/rust/pull/57106/
2788 [56470]: https://github.com/rust-lang/rust/pull/56470/
2789 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2790 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2791 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2792 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2793 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2794 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2795 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2796 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2797 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2798 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2799 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2800 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2801 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2802 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2803 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2804 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2805 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2806 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2807 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2808 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2809 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2810 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2811 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2812 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2813 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2814 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2815 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2816 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2817 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2818 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2819 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2822 Version 1.33.0 (2019-02-28)
2823 ==========================
2827 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2828 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2829 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2830 E.g. You can have match statement on a `u8` that covers `0..=255` and
2831 you would no longer be required to have a `_ => unreachable!()` case.
2832 - [You can now have multiple patterns in `if let` and `while let`
2833 expressions.][57532] You can do this with the same syntax as a `match`
2843 let state = Creature::Crab("Ferris");
2845 if let Creature::Crab(name) | Creature::Person(name) = state {
2846 println!("This creature's name is: {}", name);
2850 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2851 this feature will by default produce a warning as this behaviour can be
2852 unintuitive. E.g. `if let _ = 5 {}`
2853 - [You can now use `let` bindings, assignments, expression statements,
2854 and irrefutable pattern destructuring in const functions.][57175]
2855 - [You can now call unsafe const functions.][57067] E.g.
2857 const unsafe fn foo() -> i32 { 5 }
2858 const fn bar() -> i32 {
2862 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2863 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2864 - [You can now specify a specific alignment with the `#[repr(packed)]`
2865 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2866 with an alignment of 2 bytes and a size of 6 bytes.
2867 - [You can now import an item from a module as an `_`.][56303] This allows you to
2868 import a trait's impls, and not have the name in the namespace. E.g.
2870 use std::io::Read as _;
2872 // Allowed as there is only one `Read` in the module.
2875 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2879 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2880 command line argument.][56351]
2881 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2882 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2883 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2884 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2885 information on Rust's platform support.
2886 - [Added support for the `thumbv7neon-linux-androideabi` and
2887 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2888 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2892 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2893 functions for all numeric types.][57566]
2894 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2895 are now `const` functions for all numeric types.][57105]
2896 - [The methods `is_positive` and `is_negative` are now `const` functions for
2897 all signed numeric types.][57105]
2898 - [The `get` method for all `NonZero` types is now `const`.][57167]
2899 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2900 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2901 numeric types.][57234]
2902 - [`Ipv4Addr::new` is now a `const` function][57234]
2906 - [`unix::FileExt::read_exact_at`]
2907 - [`unix::FileExt::write_all_at`]
2908 - [`Option::transpose`]
2909 - [`Result::transpose`]
2910 - [`convert::identity`]
2913 - [`marker::PhantomPinned`]
2914 - [`Vec::resize_with`]
2915 - [`VecDeque::resize_with`]
2916 - [`Duration::as_millis`]
2917 - [`Duration::as_micros`]
2918 - [`Duration::as_nanos`]
2923 - [You can now publish crates that require a feature flag to compile with
2924 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2925 - [Cargo should now rebuild a crate if a file was modified during the initial
2930 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2931 are now deprecated in the standard library, and their usage will now produce a warning.
2932 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2934 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2936 - [Libtest no longer creates a new thread for each test when
2937 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2939 [55982]: https://github.com/rust-lang/rust/pull/55982/
2940 [56243]: https://github.com/rust-lang/rust/pull/56243
2941 [56303]: https://github.com/rust-lang/rust/pull/56303/
2942 [56351]: https://github.com/rust-lang/rust/pull/56351/
2943 [56362]: https://github.com/rust-lang/rust/pull/56362
2944 [56642]: https://github.com/rust-lang/rust/pull/56642/
2945 [56769]: https://github.com/rust-lang/rust/pull/56769/
2946 [56805]: https://github.com/rust-lang/rust/pull/56805
2947 [56947]: https://github.com/rust-lang/rust/pull/56947/
2948 [57049]: https://github.com/rust-lang/rust/pull/57049/
2949 [57067]: https://github.com/rust-lang/rust/pull/57067/
2950 [57105]: https://github.com/rust-lang/rust/pull/57105
2951 [57130]: https://github.com/rust-lang/rust/pull/57130/
2952 [57167]: https://github.com/rust-lang/rust/pull/57167/
2953 [57175]: https://github.com/rust-lang/rust/pull/57175/
2954 [57234]: https://github.com/rust-lang/rust/pull/57234/
2955 [57332]: https://github.com/rust-lang/rust/pull/57332/
2956 [57465]: https://github.com/rust-lang/rust/pull/57465/
2957 [57532]: https://github.com/rust-lang/rust/pull/57532/
2958 [57535]: https://github.com/rust-lang/rust/pull/57535/
2959 [57566]: https://github.com/rust-lang/rust/pull/57566/
2960 [57615]: https://github.com/rust-lang/rust/pull/57615/
2961 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2962 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2963 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2964 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2965 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2966 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2967 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2968 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2969 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2970 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2971 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2972 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2973 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2974 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2975 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2976 [platform-support]: https://forge.rust-lang.org/platform-support.html
2978 Version 1.32.0 (2019-01-17)
2979 ==========================
2984 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2985 operator allows you to specify zero or one repetitions similar to the `*` and
2987 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2988 now always resolve to the item (`enum`, `struct`, etc.) available in the
2989 module if present, before resolving to a external crate or an item the prelude.][56759]
2992 enum Color { Red, Green, Blue }
2998 - [You can now match against `PhantomData<T>` types.][55837]
2999 - [You can now match against literals in macros with the `literal`
3000 specifier.][56072] This will match against a literal of any type.
3001 E.g. `1`, `'A'`, `"Hello World"`
3002 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3004 struct Point(i32, i32);
3007 pub fn new(x: i32, y: i32) -> Self {
3011 pub fn is_origin(&self) -> bool {
3019 - [Self can also now be used in type definitions.][56366] E.g.
3023 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3026 Cons(T, Box<Self>) // likewise here
3029 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3030 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3034 - [The default allocator has changed from jemalloc to the default allocator on
3035 your system.][55238] The compiler itself on Linux & macOS will still use
3036 jemalloc, but programs compiled with it will use the system allocator.
3037 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3041 - [`PathBuf` now implements `FromStr`.][55148]
3042 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3043 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3044 easily debug expressions in your rust program. E.g.
3047 let b = dbg!(a * 2) + 1;
3048 // ^-- prints: [src/main.rs:4] a * 2 = 4
3052 The following APIs are now `const` functions and can be used in a
3056 - [`UnsafeCell::get`]
3057 - [`char::is_ascii`]
3059 - [`ManuallyDrop::new`]
3060 - [`ManuallyDrop::into_inner`]
3061 - [`RangeInclusive::start`]
3062 - [`RangeInclusive::end`]
3063 - [`NonNull::as_ptr`]
3066 - [`Duration::as_secs`]
3067 - [`Duration::subsec_millis`]
3068 - [`Duration::subsec_micros`]
3069 - [`Duration::subsec_nanos`]
3071 - [`Ipv4Addr::is_unspecified`]
3073 - [`Ipv6Addr::octets`]
3077 - [`i8::to_be_bytes`]
3078 - [`i8::to_le_bytes`]
3079 - [`i8::to_ne_bytes`]
3080 - [`i8::from_be_bytes`]
3081 - [`i8::from_le_bytes`]
3082 - [`i8::from_ne_bytes`]
3083 - [`i16::to_be_bytes`]
3084 - [`i16::to_le_bytes`]
3085 - [`i16::to_ne_bytes`]
3086 - [`i16::from_be_bytes`]
3087 - [`i16::from_le_bytes`]
3088 - [`i16::from_ne_bytes`]
3089 - [`i32::to_be_bytes`]
3090 - [`i32::to_le_bytes`]
3091 - [`i32::to_ne_bytes`]
3092 - [`i32::from_be_bytes`]
3093 - [`i32::from_le_bytes`]
3094 - [`i32::from_ne_bytes`]
3095 - [`i64::to_be_bytes`]
3096 - [`i64::to_le_bytes`]
3097 - [`i64::to_ne_bytes`]
3098 - [`i64::from_be_bytes`]
3099 - [`i64::from_le_bytes`]
3100 - [`i64::from_ne_bytes`]
3101 - [`i128::to_be_bytes`]
3102 - [`i128::to_le_bytes`]
3103 - [`i128::to_ne_bytes`]
3104 - [`i128::from_be_bytes`]
3105 - [`i128::from_le_bytes`]
3106 - [`i128::from_ne_bytes`]
3107 - [`isize::to_be_bytes`]
3108 - [`isize::to_le_bytes`]
3109 - [`isize::to_ne_bytes`]
3110 - [`isize::from_be_bytes`]
3111 - [`isize::from_le_bytes`]
3112 - [`isize::from_ne_bytes`]
3113 - [`u8::to_be_bytes`]
3114 - [`u8::to_le_bytes`]
3115 - [`u8::to_ne_bytes`]
3116 - [`u8::from_be_bytes`]
3117 - [`u8::from_le_bytes`]
3118 - [`u8::from_ne_bytes`]
3119 - [`u16::to_be_bytes`]
3120 - [`u16::to_le_bytes`]
3121 - [`u16::to_ne_bytes`]
3122 - [`u16::from_be_bytes`]
3123 - [`u16::from_le_bytes`]
3124 - [`u16::from_ne_bytes`]
3125 - [`u32::to_be_bytes`]
3126 - [`u32::to_le_bytes`]
3127 - [`u32::to_ne_bytes`]
3128 - [`u32::from_be_bytes`]
3129 - [`u32::from_le_bytes`]
3130 - [`u32::from_ne_bytes`]
3131 - [`u64::to_be_bytes`]
3132 - [`u64::to_le_bytes`]
3133 - [`u64::to_ne_bytes`]
3134 - [`u64::from_be_bytes`]
3135 - [`u64::from_le_bytes`]
3136 - [`u64::from_ne_bytes`]
3137 - [`u128::to_be_bytes`]
3138 - [`u128::to_le_bytes`]
3139 - [`u128::to_ne_bytes`]
3140 - [`u128::from_be_bytes`]
3141 - [`u128::from_le_bytes`]
3142 - [`u128::from_ne_bytes`]
3143 - [`usize::to_be_bytes`]
3144 - [`usize::to_le_bytes`]
3145 - [`usize::to_ne_bytes`]
3146 - [`usize::from_be_bytes`]
3147 - [`usize::from_le_bytes`]
3148 - [`usize::from_ne_bytes`]
3152 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3153 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3157 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3161 - [The argument types for AVX's
3162 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3163 been changed from `*const` to `*mut` as the previous implementation
3167 [55148]: https://github.com/rust-lang/rust/pull/55148/
3168 [55238]: https://github.com/rust-lang/rust/pull/55238/
3169 [55280]: https://github.com/rust-lang/rust/pull/55280/
3170 [55610]: https://github.com/rust-lang/rust/pull/55610/
3171 [55663]: https://github.com/rust-lang/rust/pull/55663/
3172 [55702]: https://github.com/rust-lang/rust/pull/55702/
3173 [55837]: https://github.com/rust-lang/rust/pull/55837/
3174 [55843]: https://github.com/rust-lang/rust/pull/55843/
3175 [56072]: https://github.com/rust-lang/rust/pull/56072/
3176 [56245]: https://github.com/rust-lang/rust/pull/56245/
3177 [56365]: https://github.com/rust-lang/rust/pull/56365/
3178 [56366]: https://github.com/rust-lang/rust/pull/56366/
3179 [56395]: https://github.com/rust-lang/rust/pull/56395/
3180 [56759]: https://github.com/rust-lang/rust/pull/56759/
3181 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3182 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3183 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3184 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3185 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3186 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3187 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3188 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3189 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3190 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3191 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3192 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3193 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3194 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3195 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3196 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3197 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3198 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3199 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3200 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3201 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3202 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3203 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3204 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3205 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3206 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3207 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3208 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3209 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3210 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3211 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3212 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3213 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3214 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3215 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3216 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3217 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3218 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3219 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3220 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3221 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3222 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3223 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3224 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3225 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3226 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3227 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3228 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3229 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3230 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3231 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3232 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3233 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3234 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3235 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3236 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3237 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3238 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3239 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3240 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3241 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3242 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3243 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3244 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3245 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3246 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3247 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3248 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3249 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3250 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3251 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3252 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3253 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3254 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3255 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3256 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3257 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3258 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3259 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3260 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3261 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3262 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3263 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3264 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3265 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3266 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3267 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3268 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3269 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3270 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3271 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3272 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3273 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3276 Version 1.31.1 (2018-12-20)
3277 ===========================
3279 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3280 - [Fix broken go-to-definition in RLS][rls/1171]
3281 - [Fix infinite loop on hover in RLS][rls/1170]
3283 [56562]: https://github.com/rust-lang/rust/pull/56562
3284 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3285 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3287 Version 1.31.0 (2018-12-06)
3288 ==========================
3292 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3293 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3294 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3295 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3297 - [You can now define and use `const` functions.][54835] These are currently
3298 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3299 [language reference][const-reference] for what exactly is available.
3300 - [You can now use tool lints, which allow you to scope lints from external
3301 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3302 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3303 a crate, not just in exported functions.][54451]
3304 - [You can now use parentheses in pattern matches.][54497]
3308 - [Updated musl to 1.1.20][54430]
3312 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3313 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3314 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3315 into `Option<&mut T>` using the `From` trait.][53218]
3316 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3321 - [`slice::align_to`]
3322 - [`slice::align_to_mut`]
3323 - [`slice::chunks_exact`]
3324 - [`slice::chunks_exact_mut`]
3325 - [`slice::rchunks`]
3326 - [`slice::rchunks_mut`]
3327 - [`slice::rchunks_exact`]
3328 - [`slice::rchunks_exact_mut`]
3329 - [`Option::replace`]
3333 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3334 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3335 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3337 [52813]: https://github.com/rust-lang/rust/pull/52813/
3338 [53218]: https://github.com/rust-lang/rust/pull/53218/
3339 [53555]: https://github.com/rust-lang/rust/issues/53555/
3340 [54057]: https://github.com/rust-lang/rust/pull/54057/
3341 [54240]: https://github.com/rust-lang/rust/pull/54240/
3342 [54430]: https://github.com/rust-lang/rust/pull/54430/
3343 [54451]: https://github.com/rust-lang/rust/pull/54451/
3344 [54497]: https://github.com/rust-lang/rust/pull/54497/
3345 [54778]: https://github.com/rust-lang/rust/pull/54778/
3346 [54835]: https://github.com/rust-lang/rust/pull/54835/
3347 [54870]: https://github.com/rust-lang/rust/pull/54870/
3348 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3349 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3350 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3351 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3352 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3353 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3354 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3355 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3356 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3357 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3358 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3359 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3360 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3361 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3363 Version 1.30.1 (2018-11-08)
3364 ===========================
3366 - [Fixed overflow ICE in rustdoc][54199]
3367 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3369 [54199]: https://github.com/rust-lang/rust/pull/54199
3370 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3372 Version 1.30.0 (2018-10-25)
3373 ==========================
3377 - [Procedural macros are now available.][52081] These kinds of macros allow for
3378 more powerful code generation. There is a [new chapter available][proc-macros]
3379 in the Rust Programming Language book that goes further in depth.
3380 - [You can now use keywords as identifiers using the raw identifiers
3381 syntax (`r#`),][53236] e.g. `let r#for = true;`
3382 - [Using anonymous parameters in traits is now deprecated with a warning and
3383 will be a hard error in the 2018 edition.][53272]
3384 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3385 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3386 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3387 Previously, using a external crate in a module without a use statement
3388 required `let json = ::serde_json::from_str(foo);` but can now be written
3389 as `let json = serde_json::from_str(foo);`.
3390 - [You can now apply the `#[used]` attribute to static items to prevent the
3391 compiler from optimising them away, even if they appear to be unused,][51363]
3392 e.g. `#[used] static FOO: u32 = 1;`
3393 - [You can now import and reexport macros from other crates with the `use`
3394 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3395 the root module of the crate. If your macro relies on calling other local
3396 macros, it is recommended to export with the
3397 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3399 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3400 using the `vis` specifier.][53370]
3401 - [Non-macro attributes now allow all forms of literals, not just
3402 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3403 write `#[attr(true)]`.
3404 - [You can now specify a function to handle a panic in the Rust runtime with the
3405 `#[panic_handler]` attribute.][51366]
3409 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3410 - [Added the `aarch64-unknown-netbsd` target][53165]
3411 - [Upgraded to LLVM 8.][53611]
3415 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3419 - [`Ipv4Addr::BROADCAST`]
3420 - [`Ipv4Addr::LOCALHOST`]
3421 - [`Ipv4Addr::UNSPECIFIED`]
3422 - [`Ipv6Addr::LOCALHOST`]
3423 - [`Ipv6Addr::UNSPECIFIED`]
3424 - [`Iterator::find_map`]
3426 The following methods are replacement methods for `trim_left`, `trim_right`,
3427 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3429 - [`str::trim_end_matches`]
3431 - [`str::trim_start_matches`]
3432 - [`str::trim_start`]
3436 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3437 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3438 equivalent to calling `rustdoc --error-format=json`.
3439 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3443 - [`rustdoc` allows you to specify what edition to treat your code as with the
3444 `--edition` option.][54057]
3445 - [`rustdoc` now has the `--color` (specify whether to output color) and
3446 `--error-format` (specify error format, e.g. `json`) options.][53003]
3447 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3448 debug symbols.][53774]
3449 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3450 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3452 [50911]: https://github.com/rust-lang/rust/pull/50911/
3453 [51363]: https://github.com/rust-lang/rust/pull/51363/
3454 [51366]: https://github.com/rust-lang/rust/pull/51366/
3455 [52081]: https://github.com/rust-lang/rust/pull/52081/
3456 [53003]: https://github.com/rust-lang/rust/pull/53003/
3457 [53033]: https://github.com/rust-lang/rust/pull/53033/
3458 [53044]: https://github.com/rust-lang/rust/pull/53044/
3459 [53165]: https://github.com/rust-lang/rust/pull/53165/
3460 [53611]: https://github.com/rust-lang/rust/pull/53611/
3461 [53213]: https://github.com/rust-lang/rust/pull/53213/
3462 [53236]: https://github.com/rust-lang/rust/pull/53236/
3463 [53272]: https://github.com/rust-lang/rust/pull/53272/
3464 [53370]: https://github.com/rust-lang/rust/pull/53370/
3465 [53459]: https://github.com/rust-lang/rust/pull/53459/
3466 [53774]: https://github.com/rust-lang/rust/pull/53774/
3467 [53822]: https://github.com/rust-lang/rust/pull/53822/
3468 [54057]: https://github.com/rust-lang/rust/pull/54057/
3469 [54146]: https://github.com/rust-lang/rust/pull/54146/
3470 [54404]: https://github.com/rust-lang/rust/pull/54404/
3471 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3472 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3473 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3474 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3476 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3477 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3478 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3479 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3480 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3481 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3482 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3483 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3484 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3485 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3488 Version 1.29.2 (2018-10-11)
3489 ===========================
3491 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3492 - The `rls-preview` component on the windows-gnu targets has been restored.
3494 [54639]: https://github.com/rust-lang/rust/pull/54639
3497 Version 1.29.1 (2018-09-25)
3498 ===========================
3503 - The standard library's `str::repeat` function contained an out of bounds write
3504 caused by an integer overflow. This has been fixed by deterministically
3505 panicking when an overflow happens.
3507 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3511 Version 1.29.0 (2018-09-13)
3512 ==========================
3516 - [Bumped minimum LLVM version to 5.0.][51899]
3517 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3518 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3519 - [Upgraded to LLVM 7.][51966]
3523 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3524 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3525 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3526 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3528 - [`Cell<T>` now allows `T` to be unsized.][50494]
3529 - [`SocketAddr` is now stable on Redox.][52656]
3534 - [`Iterator::flatten`]
3539 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3540 `--locked` to disable this behavior.
3541 - [`cargo-install` will now allow you to cross compile an install
3542 using `--target`.][cargo/5614]
3543 - [Added the `cargo-fix` subcommand to automatically move project code from
3544 2015 edition to 2018.][cargo/5723]
3545 - [`cargo doc` can now optionally document private types using the
3546 `--document-private-items` flag.][cargo/5543]
3550 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3551 the specified level to that level.][52354] For example `--cap-lints warn`
3552 will demote `deny` and `forbid` lints to `warn`.
3553 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3554 fails and `101` if there is a panic.][52197]
3555 - [A preview of clippy has been made available through rustup.][51122]
3556 You can install the preview with `rustup component add clippy-preview`.
3560 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3561 Use `str::get_unchecked(begin..end)` instead.
3562 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3563 Consider using the `home_dir` function from
3564 https://crates.io/crates/dirs instead.
3565 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3566 - [`cfg` attributes and `--cfg` command line flags are now more
3567 strictly validated.][53893]
3569 [53893]: https://github.com/rust-lang/rust/pull/53893/
3570 [52861]: https://github.com/rust-lang/rust/pull/52861/
3571 [51966]: https://github.com/rust-lang/rust/pull/51966/
3572 [52656]: https://github.com/rust-lang/rust/pull/52656/
3573 [52239]: https://github.com/rust-lang/rust/pull/52239/
3574 [52330]: https://github.com/rust-lang/rust/pull/52330/
3575 [52354]: https://github.com/rust-lang/rust/pull/52354/
3576 [52402]: https://github.com/rust-lang/rust/pull/52402/
3577 [52103]: https://github.com/rust-lang/rust/pull/52103/
3578 [52197]: https://github.com/rust-lang/rust/pull/52197/
3579 [51807]: https://github.com/rust-lang/rust/pull/51807/
3580 [51899]: https://github.com/rust-lang/rust/pull/51899/
3581 [51912]: https://github.com/rust-lang/rust/pull/51912/
3582 [51511]: https://github.com/rust-lang/rust/pull/51511/
3583 [51619]: https://github.com/rust-lang/rust/pull/51619/
3584 [51656]: https://github.com/rust-lang/rust/pull/51656/
3585 [51178]: https://github.com/rust-lang/rust/pull/51178/
3586 [51122]: https://github.com/rust-lang/rust/pull/51122
3587 [50494]: https://github.com/rust-lang/rust/pull/50494/
3588 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3589 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3590 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3591 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3592 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3593 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3594 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3597 Version 1.28.0 (2018-08-02)
3598 ===========================
3602 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3603 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3604 the inner type across Foreign Function Interface (FFI) boundaries.
3605 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3606 and can now be used as identifiers.][51196]
3607 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3608 stable.][51241] This will allow users to specify a global allocator for
3610 - [Unit test functions marked with the `#[test]` attribute can now return
3611 `Result<(), E: Debug>` in addition to `()`.][51298]
3612 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3613 allows macros to easily target lifetimes.
3617 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3618 prioritise making smaller binary sizes. `z` is the same as `s` with the
3619 exception that it does not vectorise loops, which typically results in an even
3621 - [The short error format is now stable.][49546] Specified with
3622 `--error-format=short` this option will provide a more compressed output of
3623 rust error messages.
3624 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3625 - [Reduced the number of allocations in the macro parser.][50855] This can
3626 improve compile times of macro heavy crates on average by 5%.
3630 - [Implemented `Default` for `&mut str`.][51306]
3631 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3632 - [Implemented `Extend` for `()`.][50234]
3633 - [The `Debug` implementation of `time::Duration` should now be more easily
3634 human readable.][50364] Previously a `Duration` of one second would printed as
3635 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3636 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3637 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3638 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3639 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3640 for `PathBuf`.][50170]
3641 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3642 and `Wrapping<i128>`.][50465]
3643 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3644 possible.][51050] This can provide up to a 40% speed increase.
3645 - [Improved error messages when using `format!`.][50610]
3649 - [`Iterator::step_by`]
3650 - [`Path::ancestors`]
3651 - [`SystemTime::UNIX_EPOCH`]
3652 - [`alloc::GlobalAlloc`]
3654 - [`alloc::LayoutErr`]
3657 - [`alloc::alloc_zeroed`]
3658 - [`alloc::dealloc`]
3659 - [`alloc::realloc`]
3660 - [`alloc::handle_alloc_error`]
3661 - [`btree_map::Entry::or_default`]
3662 - [`fmt::Alignment`]
3663 - [`hash_map::Entry::or_default`]
3664 - [`iter::repeat_with`]
3665 - [`num::NonZeroUsize`]
3666 - [`num::NonZeroU128`]
3667 - [`num::NonZeroU16`]
3668 - [`num::NonZeroU32`]
3669 - [`num::NonZeroU64`]
3670 - [`num::NonZeroU8`]
3671 - [`ops::RangeBounds`]
3672 - [`slice::SliceIndex`]
3673 - [`slice::from_mut`]
3674 - [`slice::from_ref`]
3675 - [`{Any + Send + Sync}::downcast_mut`]
3676 - [`{Any + Send + Sync}::downcast_ref`]
3677 - [`{Any + Send + Sync}::is`]
3681 - [Cargo will now no longer allow you to publish crates with build scripts that
3682 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3683 considered to be immutable.
3687 - [The `suggestion_applicability` field in `rustc`'s json output is now
3688 stable.][50486] This will allow dev tools to check whether a code suggestion
3689 would apply to them.
3693 - [Rust will consider trait objects with duplicated constraints to be the same
3694 type as without the duplicated constraint.][51276] For example the below code will
3695 now fail to compile.
3700 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3703 impl Trait + Send + Send {
3704 fn test(&self) { println!("two"); }
3708 [49546]: https://github.com/rust-lang/rust/pull/49546/
3709 [50143]: https://github.com/rust-lang/rust/pull/50143/
3710 [50170]: https://github.com/rust-lang/rust/pull/50170/
3711 [50234]: https://github.com/rust-lang/rust/pull/50234/
3712 [50265]: https://github.com/rust-lang/rust/pull/50265/
3713 [50364]: https://github.com/rust-lang/rust/pull/50364/
3714 [50385]: https://github.com/rust-lang/rust/pull/50385/
3715 [50465]: https://github.com/rust-lang/rust/pull/50465/
3716 [50486]: https://github.com/rust-lang/rust/pull/50486/
3717 [50554]: https://github.com/rust-lang/rust/pull/50554/
3718 [50610]: https://github.com/rust-lang/rust/pull/50610/
3719 [50855]: https://github.com/rust-lang/rust/pull/50855/
3720 [51050]: https://github.com/rust-lang/rust/pull/51050/
3721 [51196]: https://github.com/rust-lang/rust/pull/51196/
3722 [51200]: https://github.com/rust-lang/rust/pull/51200/
3723 [51241]: https://github.com/rust-lang/rust/pull/51241/
3724 [51276]: https://github.com/rust-lang/rust/pull/51276/
3725 [51298]: https://github.com/rust-lang/rust/pull/51298/
3726 [51306]: https://github.com/rust-lang/rust/pull/51306/
3727 [51562]: https://github.com/rust-lang/rust/pull/51562/
3728 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3729 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3730 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3731 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3732 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3733 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3734 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3735 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3736 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3737 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3738 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3739 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3740 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3741 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3742 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3743 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3744 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3745 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3746 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3747 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3748 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3749 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3750 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3751 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3752 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3753 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3754 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3755 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3756 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3757 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3759 Version 1.27.2 (2018-07-20)
3760 ===========================
3765 - The borrow checker was fixed to avoid potential unsoundness when using
3766 match ergonomics: [#52213][52213].
3768 [52213]: https://github.com/rust-lang/rust/issues/52213
3770 Version 1.27.1 (2018-07-10)
3771 ===========================
3776 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3777 when running, which enabled executing code as some other user on a
3778 given machine. This release fixes that vulnerability; you can read
3779 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3781 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3786 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3787 match ergonomics: [#51415][51415], [#49534][49534].
3789 [51415]: https://github.com/rust-lang/rust/issues/51415
3790 [49534]: https://github.com/rust-lang/rust/issues/49534
3791 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3792 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3794 Version 1.27.0 (2018-06-21)
3795 ==========================
3799 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3800 be used as an identifier.
3801 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3802 bare `Trait` syntax, and should make it clearer when being used in tandem with
3803 `impl Trait` because it is equivalent to the following syntax:
3804 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3805 `Box<Trait> == Box<dyn Trait>`.
3806 - [Attributes on generic parameters such as types and lifetimes are
3807 now stable.][48851] e.g.
3808 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3809 - [The `#[must_use]` attribute can now also be used on functions as well as
3810 types.][48925] It provides a lint that by default warns users when the
3811 value returned by a function has not been used.
3815 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3819 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3820 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3821 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3822 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3823 the `cfg` attribute.
3824 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3825 std are now available in core.][49896]
3826 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3828 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3829 that the operation isn't done in place.
3830 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3831 the `#[must_use]` attribute][49533] to warn about unused potentially
3832 expensive allocations.
3836 - [`DoubleEndedIterator::rfind`]
3837 - [`DoubleEndedIterator::rfold`]
3838 - [`DoubleEndedIterator::try_rfold`]
3839 - [`Duration::from_micros`]
3840 - [`Duration::from_nanos`]
3841 - [`Duration::subsec_micros`]
3842 - [`Duration::subsec_millis`]
3843 - [`HashMap::remove_entry`]
3844 - [`Iterator::try_fold`]
3845 - [`Iterator::try_for_each`]
3847 - [`Option::filter`]
3848 - [`String::replace_range`]
3849 - [`Take::set_limit`]
3850 - [`hint::unreachable_unchecked`]
3851 - [`os::unix::process::parent_id`]
3852 - [`ptr::swap_nonoverlapping`]
3853 - [`slice::rsplit_mut`]
3855 - [`slice::swap_with_slice`]
3859 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3860 `readme`, and `repository` fields.][cargo/5386]
3861 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3862 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3863 a different directory than `target` for placing compilation artifacts.
3864 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3865 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3866 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3867 where cargo would infer a binary, Cargo will produce a warning. You can
3868 disable this feature ahead of time by setting any of the following to false:
3869 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3870 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3871 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3875 - [Added “The Rustc book” into the official documentation.][49707]
3876 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3877 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3881 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3882 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3883 compile, `"".is_empty()` will still compile.
3884 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3885 will only print the inner type.][48553] E.g.
3886 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3887 not `AtomicBool(true)`.
3888 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3889 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3890 alignment should cover all use cases.
3891 - The `.description()` method on the `std::error::Error` trait
3892 [has been soft-deprecated][50163]. It is no longer required to implement it.
3894 [48553]: https://github.com/rust-lang/rust/pull/48553/
3895 [48851]: https://github.com/rust-lang/rust/pull/48851/
3896 [48925]: https://github.com/rust-lang/rust/pull/48925/
3897 [49533]: https://github.com/rust-lang/rust/pull/49533/
3898 [49623]: https://github.com/rust-lang/rust/pull/49623/
3899 [49630]: https://github.com/rust-lang/rust/pull/49630/
3900 [49664]: https://github.com/rust-lang/rust/pull/49664/
3901 [49699]: https://github.com/rust-lang/rust/pull/49699/
3902 [49707]: https://github.com/rust-lang/rust/pull/49707/
3903 [49719]: https://github.com/rust-lang/rust/pull/49719/
3904 [49896]: https://github.com/rust-lang/rust/pull/49896/
3905 [49968]: https://github.com/rust-lang/rust/pull/49968/
3906 [50163]: https://github.com/rust-lang/rust/pull/50163
3907 [50177]: https://github.com/rust-lang/rust/pull/50177/
3908 [50378]: https://github.com/rust-lang/rust/pull/50378/
3909 [50398]: https://github.com/rust-lang/rust/pull/50398/
3910 [50423]: https://github.com/rust-lang/rust/pull/50423/
3911 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3912 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3913 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3914 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3915 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3916 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3917 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3918 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3919 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3920 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3921 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3922 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3923 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3924 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3925 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3926 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3927 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3928 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3929 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3930 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3931 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3932 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3933 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3934 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3935 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3936 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3937 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3938 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3939 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3940 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3943 Version 1.26.2 (2018-06-05)
3944 ==========================
3949 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3951 [51117]: https://github.com/rust-lang/rust/issues/51117
3954 Version 1.26.1 (2018-05-29)
3955 ==========================
3960 - [RLS now works on Windows.][50646]
3961 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3967 - [`fn main() -> impl Trait` no longer works for non-Termination
3969 This reverts an accidental stabilization.
3970 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3971 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3973 [50646]: https://github.com/rust-lang/rust/issues/50646
3974 [50656]: https://github.com/rust-lang/rust/pull/50656
3975 [50812]: https://github.com/rust-lang/rust/pull/50812
3976 [50950]: https://github.com/rust-lang/rust/issues/50950
3977 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3979 Version 1.26.0 (2018-05-10)
3980 ==========================
3984 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3985 implement either or both traits.][49299]
3986 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3987 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3988 lifetime can be elided.][49458]
3989 - [`impl Trait` is now stable allowing you to have abstract types in returns
3990 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3991 `fn open(path: impl AsRef<Path>)`.
3992 - [Pattern matching will now automatically apply dereferences.][49394]
3993 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3994 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3995 - [A lot of operations are now available in a const context.][46882] E.g. You
3996 can now index into constant arrays, reference and dereference into constants,
3997 and use tuple struct constructors.
3998 - [Fixed entry slice patterns are now stable.][48516] E.g.
4000 let points = [1, 2, 3, 4];
4002 [1, 2, 3, 4] => println!("All points were sequential."),
4003 _ => println!("Not all points were sequential."),
4010 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4011 - [Fixed exponential projection complexity on nested types.][48296]
4012 This can provide up to a ~12% reduction in compile times for certain crates.
4013 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4014 to remap path prefixes outputted by the compiler.
4015 - [Added `powerpc-unknown-netbsd` target.][48281]
4019 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4020 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4021 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4022 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4023 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4024 - [`ascii::escape_default` is now available in libcore.][48735]
4025 - [Trailing commas are now supported in std and core macros.][48056]
4026 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4027 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4032 - [`*const T::copy_to_nonoverlapping`]
4033 - [`*const T::copy_to`]
4034 - [`*const T::read_unaligned`]
4035 - [`*const T::read_volatile`]
4036 - [`*const T::read`]
4038 - [`*const T::wrapping_add`]
4039 - [`*const T::wrapping_sub`]
4041 - [`*mut T::copy_to_nonoverlapping`]
4042 - [`*mut T::copy_to`]
4043 - [`*mut T::read_unaligned`]
4044 - [`*mut T::read_volatile`]
4046 - [`*mut T::replace`]
4049 - [`*mut T::wrapping_add`]
4050 - [`*mut T::wrapping_sub`]
4051 - [`*mut T::write_bytes`]
4052 - [`*mut T::write_unaligned`]
4053 - [`*mut T::write_volatile`]
4056 - [`FromUtf8Error::as_bytes`]
4057 - [`LocalKey::try_with`]
4058 - [`Option::cloned`]
4059 - [`btree_map::Entry::and_modify`]
4060 - [`fs::read_to_string`]
4063 - [`hash_map::Entry::and_modify`]
4064 - [`iter::FusedIterator`]
4065 - [`ops::RangeInclusive`]
4066 - [`ops::RangeToInclusive`]
4068 - [`slice::rotate_left`]
4069 - [`slice::rotate_right`]
4070 - [`String::retain`]
4075 - [Cargo will now output path to custom commands when `-v` is
4076 passed with `--list`][cargo/5041]
4077 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4081 - [The second edition of "The Rust Programming Language" book is now recommended
4082 over the first.][48404]
4087 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4088 syntax is now invalid.
4090 use std::ops::Fn as dyn;
4091 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4093 - [The result of dereferences are no longer promoted to `'static`.][47408]
4097 const PAIR: &(i32, i32) = &(0, 1);
4098 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4101 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4102 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4104 - [Removed hoedown from rustdoc.][48274]
4105 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4107 [46882]: https://github.com/rust-lang/rust/pull/46882
4108 [47379]: https://github.com/rust-lang/rust/pull/47379
4109 [47408]: https://github.com/rust-lang/rust/pull/47408
4110 [47813]: https://github.com/rust-lang/rust/pull/47813
4111 [48056]: https://github.com/rust-lang/rust/pull/48056
4112 [48125]: https://github.com/rust-lang/rust/pull/48125
4113 [48166]: https://github.com/rust-lang/rust/pull/48166
4114 [48235]: https://github.com/rust-lang/rust/pull/48235
4115 [48274]: https://github.com/rust-lang/rust/pull/48274
4116 [48281]: https://github.com/rust-lang/rust/pull/48281
4117 [48296]: https://github.com/rust-lang/rust/pull/48296
4118 [48326]: https://github.com/rust-lang/rust/pull/48326
4119 [48359]: https://github.com/rust-lang/rust/pull/48359
4120 [48404]: https://github.com/rust-lang/rust/pull/48404
4121 [48481]: https://github.com/rust-lang/rust/pull/48481
4122 [48516]: https://github.com/rust-lang/rust/pull/48516
4123 [48628]: https://github.com/rust-lang/rust/pull/48628
4124 [48629]: https://github.com/rust-lang/rust/pull/48629
4125 [48657]: https://github.com/rust-lang/rust/pull/48657
4126 [48735]: https://github.com/rust-lang/rust/pull/48735
4127 [48978]: https://github.com/rust-lang/rust/pull/48978
4128 [49101]: https://github.com/rust-lang/rust/pull/49101
4129 [49109]: https://github.com/rust-lang/rust/pull/49109
4130 [49121]: https://github.com/rust-lang/rust/pull/49121
4131 [49162]: https://github.com/rust-lang/rust/pull/49162
4132 [49184]: https://github.com/rust-lang/rust/pull/49184
4133 [49234]: https://github.com/rust-lang/rust/pull/49234
4134 [49255]: https://github.com/rust-lang/rust/pull/49255
4135 [49299]: https://github.com/rust-lang/rust/pull/49299
4136 [49305]: https://github.com/rust-lang/rust/pull/49305
4137 [49394]: https://github.com/rust-lang/rust/pull/49394
4138 [49458]: https://github.com/rust-lang/rust/pull/49458
4139 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4140 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4141 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4142 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4143 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4144 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4145 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4146 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4147 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4148 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4149 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4150 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4151 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4152 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4153 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4154 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4155 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4156 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4157 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4158 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4159 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4160 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4161 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4162 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4163 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4164 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4165 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4166 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4167 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4168 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4169 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4170 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4171 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4172 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4173 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4174 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4175 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4176 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4177 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4178 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4179 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4180 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4183 Version 1.25.0 (2018-03-29)
4184 ==========================
4188 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4189 - [You can now use nested groups of imports.][47948]
4190 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4191 - [You can now have `|` at the start of a match arm.][47947] e.g.
4193 enum Foo { A, B, C }
4199 | Foo::B => println!("AB"),
4200 | Foo::C => println!("C"),
4207 - [Upgraded to LLVM 6.][47828]
4208 - [Added `-C lto=val` option.][47521]
4209 - [Added `i586-unknown-linux-musl` target][47282]
4213 - [Impl Send for `process::Command` on Unix.][47760]
4214 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4215 - [`UnsafeCell::into_inner` is now safe.][47204]
4216 - [Implement libstd for CloudABI.][47268]
4217 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4218 - [Implement `AsRef<Path>` for Component][46985]
4219 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4220 - [Moved `Duration` to libcore.][46666]
4224 - [`Location::column`]
4227 The following functions can now be used in a constant expression.
4228 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4229 - [`Duration::new`][47300]
4230 - [`Duration::from_secs`][47300]
4231 - [`Duration::from_millis`][47300]
4235 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4236 - [`cargo new` now defaults to creating a binary crate, instead of a
4237 library crate.][cargo/5029]
4241 - [Rust by example is now shipped with new releases][46196]
4245 - [Deprecated `net::lookup_host`.][47510]
4246 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4247 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4248 around indexing operations (see [#47349][47349]). This has been fixed (which also
4249 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4250 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4252 [33903]: https://github.com/rust-lang/rust/pull/33903
4253 [47947]: https://github.com/rust-lang/rust/pull/47947
4254 [47948]: https://github.com/rust-lang/rust/pull/47948
4255 [47760]: https://github.com/rust-lang/rust/pull/47760
4256 [47790]: https://github.com/rust-lang/rust/pull/47790
4257 [47828]: https://github.com/rust-lang/rust/pull/47828
4258 [47398]: https://github.com/rust-lang/rust/pull/47398
4259 [47510]: https://github.com/rust-lang/rust/pull/47510
4260 [47521]: https://github.com/rust-lang/rust/pull/47521
4261 [47204]: https://github.com/rust-lang/rust/pull/47204
4262 [47251]: https://github.com/rust-lang/rust/pull/47251
4263 [47268]: https://github.com/rust-lang/rust/pull/47268
4264 [47282]: https://github.com/rust-lang/rust/pull/47282
4265 [47300]: https://github.com/rust-lang/rust/pull/47300
4266 [47349]: https://github.com/rust-lang/rust/pull/47349
4267 [46931]: https://github.com/rust-lang/rust/pull/46931
4268 [46985]: https://github.com/rust-lang/rust/pull/46985
4269 [47006]: https://github.com/rust-lang/rust/pull/47006
4270 [46830]: https://github.com/rust-lang/rust/pull/46830
4271 [46095]: https://github.com/rust-lang/rust/pull/46095
4272 [46666]: https://github.com/rust-lang/rust/pull/46666
4273 [46196]: https://github.com/rust-lang/rust/pull/46196
4274 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4275 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4276 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4277 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4278 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4281 Version 1.24.1 (2018-03-01)
4282 ==========================
4284 - [Do not abort when unwinding through FFI][48251]
4285 - [Emit UTF-16 files for linker arguments on Windows][48318]
4286 - [Make the error index generator work again][48308]
4287 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4289 [48251]: https://github.com/rust-lang/rust/issues/48251
4290 [48308]: https://github.com/rust-lang/rust/issues/48308
4291 [48318]: https://github.com/rust-lang/rust/issues/48318
4292 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4295 Version 1.24.0 (2018-02-15)
4296 ==========================
4300 - [External `sysv64` ffi is now available.][46528]
4301 eg. `extern "sysv64" fn foo () {}`
4305 - [rustc now uses 16 codegen units by default for release builds.][46910]
4306 For the fastest builds, utilize `codegen-units=1`.
4307 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4308 - [Add `aarch64-unknown-openbsd` support][46760]
4312 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4313 improvement in performance in the majority of cases.
4314 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4315 with Windows.][46798]
4316 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4317 - [impl `From<bool>` for `AtomicBool`][46293]
4318 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4319 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4320 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4321 - [float::from_bits now just uses transmute.][46012] This provides
4322 some optimisations from LLVM.
4323 - [Copied `AsciiExt` methods onto `char`][46077]
4324 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4325 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4326 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4327 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4331 - [`RefCell::replace`]
4333 - [`atomic::spin_loop_hint`]
4335 The following functions can now be used in a constant expression.
4336 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4338 - [`AtomicBool::new`][46287]
4339 - [`AtomicUsize::new`][46287]
4340 - [`AtomicIsize::new`][46287]
4341 - [`AtomicPtr::new`][46287]
4342 - [`Cell::new`][46287]
4343 - [`{integer}::min_value`][46287]
4344 - [`{integer}::max_value`][46287]
4345 - [`mem::size_of`][46287]
4346 - [`mem::align_of`][46287]
4347 - [`ptr::null`][46287]
4348 - [`ptr::null_mut`][46287]
4349 - [`RefCell::new`][46287]
4350 - [`UnsafeCell::new`][46287]
4354 - [Added a `workspace.default-members` config that
4355 overrides implied `--all` in virtual workspaces.][cargo/4743]
4356 - [Enable incremental by default on development builds.][cargo/4817] Also added
4357 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4358 per-project or global basis respectively.
4365 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4366 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4367 in accordance with IETF RFC 4291 §2.2.
4368 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4369 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4370 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4371 - [Leading zeros in tuple struct members is now an error][47084]
4372 - [`column!()` macro is one-based instead of zero-based][46977]
4373 - [`fmt::Arguments` can no longer be shared across threads][45198]
4374 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4375 - [Cargo sets a different working directory for the compiler][cargo/4788]
4377 [44884]: https://github.com/rust-lang/rust/pull/44884
4378 [45198]: https://github.com/rust-lang/rust/pull/45198
4379 [45506]: https://github.com/rust-lang/rust/pull/45506
4380 [45904]: https://github.com/rust-lang/rust/pull/45904
4381 [45990]: https://github.com/rust-lang/rust/pull/45990
4382 [46012]: https://github.com/rust-lang/rust/pull/46012
4383 [46077]: https://github.com/rust-lang/rust/pull/46077
4384 [46094]: https://github.com/rust-lang/rust/pull/46094
4385 [46284]: https://github.com/rust-lang/rust/pull/46284
4386 [46287]: https://github.com/rust-lang/rust/pull/46287
4387 [46293]: https://github.com/rust-lang/rust/pull/46293
4388 [46528]: https://github.com/rust-lang/rust/pull/46528
4389 [46671]: https://github.com/rust-lang/rust/pull/46671
4390 [46713]: https://github.com/rust-lang/rust/pull/46713
4391 [46735]: https://github.com/rust-lang/rust/pull/46735
4392 [46749]: https://github.com/rust-lang/rust/pull/46749
4393 [46760]: https://github.com/rust-lang/rust/pull/46760
4394 [46798]: https://github.com/rust-lang/rust/pull/46798
4395 [46828]: https://github.com/rust-lang/rust/pull/46828
4396 [46831]: https://github.com/rust-lang/rust/pull/46831
4397 [46833]: https://github.com/rust-lang/rust/pull/46833
4398 [46910]: https://github.com/rust-lang/rust/pull/46910
4399 [46977]: https://github.com/rust-lang/rust/pull/46977
4400 [47018]: https://github.com/rust-lang/rust/pull/47018
4401 [47080]: https://github.com/rust-lang/rust/pull/47080
4402 [47084]: https://github.com/rust-lang/rust/pull/47084
4403 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4404 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4405 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4406 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4407 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4408 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4411 Version 1.23.0 (2018-01-04)
4412 ==========================
4416 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4417 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4418 Which should fix some confusing errors in some operations.
4422 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4423 undefined behavior.][45920]
4424 - [rustc now suggests renaming import if names clash.][45660]
4425 - [Display errors/warnings correctly when there are zero-width or
4426 wide characters.][45711]
4427 - [rustc now avoids unnecessary copies of arguments that are
4428 simple bindings][45380] This should improve memory usage on average by 5-10%.
4429 - [Updated musl used to build musl rustc to 1.1.17][45393]
4433 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4434 - [Implement Hash for raw pointers to unsized types][45483]
4435 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4436 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4437 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4438 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4439 and `<*mut T>::as_mut`][44932]
4440 - [Optimized `Thread::{park, unpark}` implementation][45524]
4441 - [Improved `SliceExt::binary_search` performance.][45333]
4442 - [impl `FromIterator<()>` for `()`][45379]
4443 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4451 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4452 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4453 - [Added unit test checking to `cargo check`][cargo/4592]
4454 - [Cargo now lets you install a specific version
4455 using `cargo install --version`][cargo/4637]
4459 - [Releases now ship with the Cargo book documentation.][45692]
4460 - [rustdoc now prints rendering warnings on every run.][45324]
4464 - [Changes have been made to type equality to make it more correct,
4465 in rare cases this could break some code.][45853] [Tracking issue for
4466 further information][45852]
4467 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4468 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4469 Android 9, the minimum supported version is Android 14.
4470 - [Bumped the minimum LLVM to 3.9][45326]
4472 [44042]: https://github.com/rust-lang/rust/pull/44042
4473 [44932]: https://github.com/rust-lang/rust/pull/44932
4474 [45267]: https://github.com/rust-lang/rust/pull/45267
4475 [45324]: https://github.com/rust-lang/rust/pull/45324
4476 [45326]: https://github.com/rust-lang/rust/pull/45326
4477 [45333]: https://github.com/rust-lang/rust/pull/45333
4478 [45379]: https://github.com/rust-lang/rust/pull/45379
4479 [45380]: https://github.com/rust-lang/rust/pull/45380
4480 [45393]: https://github.com/rust-lang/rust/pull/45393
4481 [45435]: https://github.com/rust-lang/rust/pull/45435
4482 [45483]: https://github.com/rust-lang/rust/pull/45483
4483 [45524]: https://github.com/rust-lang/rust/pull/45524
4484 [45571]: https://github.com/rust-lang/rust/pull/45571
4485 [45580]: https://github.com/rust-lang/rust/pull/45580
4486 [45610]: https://github.com/rust-lang/rust/pull/45610
4487 [45660]: https://github.com/rust-lang/rust/pull/45660
4488 [45692]: https://github.com/rust-lang/rust/pull/45692
4489 [45711]: https://github.com/rust-lang/rust/pull/45711
4490 [45772]: https://github.com/rust-lang/rust/pull/45772
4491 [45852]: https://github.com/rust-lang/rust/issues/45852
4492 [45853]: https://github.com/rust-lang/rust/pull/45853
4493 [45887]: https://github.com/rust-lang/rust/pull/45887
4494 [45920]: https://github.com/rust-lang/rust/pull/45920
4495 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4496 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4497 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4500 Version 1.22.1 (2017-11-22)
4501 ==========================
4503 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4505 [46183]: https://github.com/rust-lang/rust/pull/46183
4507 Version 1.22.0 (2017-11-22)
4508 ==========================
4512 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4513 - [Now accepts underscores in unicode escapes][43716]
4514 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4515 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4519 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4520 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4521 This should decrease compile times for debug builds.
4522 - [strict memory alignment now enabled on ARMv6][45094]
4523 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4527 - [Allow atomic operations up to 32 bits
4528 on `armv5te_unknown_linux_gnueabi`][44978]
4529 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4530 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4531 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4532 - [Properly detect overflow in `Instant += Duration`.][44220]
4533 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4534 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4535 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4542 - [Cargo will now build multi file examples in subdirectories of the `examples`
4543 folder that have a `main.rs` file.][cargo/4496]
4544 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4545 the old format will continue to work and can be updated with `cargo update`.
4546 - [Now supports vendoring git repositories][cargo/3992]
4550 - [`libbacktrace` is now available on Apple platforms.][44251]
4551 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4552 This now lets you specify that a given code example will fail to compile.
4556 - [The minimum Android version that rustc can build for has been bumped
4557 to `4.0` from `2.3`][45656]
4558 - [Allowing `T op= &T` for numeric types has broken some type
4559 inference cases][45480]
4562 [42526]: https://github.com/rust-lang/rust/pull/42526
4563 [43017]: https://github.com/rust-lang/rust/pull/43017
4564 [43716]: https://github.com/rust-lang/rust/pull/43716
4565 [43949]: https://github.com/rust-lang/rust/pull/43949
4566 [44015]: https://github.com/rust-lang/rust/pull/44015
4567 [44220]: https://github.com/rust-lang/rust/pull/44220
4568 [44251]: https://github.com/rust-lang/rust/pull/44251
4569 [44287]: https://github.com/rust-lang/rust/pull/44287
4570 [44303]: https://github.com/rust-lang/rust/pull/44303
4571 [44456]: https://github.com/rust-lang/rust/pull/44456
4572 [44466]: https://github.com/rust-lang/rust/pull/44466
4573 [44895]: https://github.com/rust-lang/rust/pull/44895
4574 [44966]: https://github.com/rust-lang/rust/pull/44966
4575 [44978]: https://github.com/rust-lang/rust/pull/44978
4576 [45041]: https://github.com/rust-lang/rust/pull/45041
4577 [45064]: https://github.com/rust-lang/rust/pull/45064
4578 [45075]: https://github.com/rust-lang/rust/pull/45075
4579 [45094]: https://github.com/rust-lang/rust/pull/45094
4580 [45095]: https://github.com/rust-lang/rust/pull/45095
4581 [45480]: https://github.com/rust-lang/rust/issues/45480
4582 [45656]: https://github.com/rust-lang/rust/pull/45656
4583 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4584 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4585 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4592 Version 1.21.0 (2017-10-12)
4593 ==========================
4597 - [You can now use static references for literals.][43838]
4601 let x: &'static u32 = &0;
4604 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4607 my_macro!(Vec<i32>::new); // Always worked
4608 my_macro!(Vec::<i32>::new); // Now works
4613 - [Upgraded jemalloc to 4.5.0][43911]
4614 - [Enabled unwinding panics on Redox][43917]
4615 - [Now runs LLVM in parallel during translation phase.][43506]
4616 This should reduce peak memory usage.
4620 - [Generate builtin impls for `Clone` for all arrays and tuples that
4621 are `T: Clone`][43690]
4622 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4623 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4624 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4629 [`std::mem::discriminant`]
4633 - [You can now call `cargo install` with multiple package names][cargo/4216]
4634 - [Cargo commands inside a virtual workspace will now implicitly
4635 pass `--all`][cargo/4335]
4636 - [Added a `[patch]` section to `Cargo.toml` to handle
4637 prepublication dependencies][cargo/4123] [RFC 1969]
4638 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4639 like patterns][cargo/4270]
4640 - [Added the `--all-targets` option][cargo/4400]
4641 - [Using required dependencies as a feature is now deprecated and emits
4642 a warning][cargo/4364]
4647 - [Cargo docs are moving][43916]
4648 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4649 - [The rustdoc book is now available][43863]
4650 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4651 - [Added a preview of RLS has been made available through rustup][44204]
4652 Install with `rustup component add rls-preview`
4653 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4654 Previously only showed `std::os::unix`.
4658 - [Changes in method matching against higher-ranked types][43880] This may cause
4659 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4660 - [rustc's JSON error output's byte position start at top of file.][42973]
4661 Was previously relative to the rustc's internal `CodeMap` struct which
4662 required the unstable library `libsyntax` to correctly use.
4663 - [`unused_results` lint no longer ignores booleans][43728]
4665 [42565]: https://github.com/rust-lang/rust/pull/42565
4666 [42973]: https://github.com/rust-lang/rust/pull/42973
4667 [43348]: https://github.com/rust-lang/rust/pull/43348
4668 [43459]: https://github.com/rust-lang/rust/pull/43459
4669 [43506]: https://github.com/rust-lang/rust/pull/43506
4670 [43540]: https://github.com/rust-lang/rust/pull/43540
4671 [43690]: https://github.com/rust-lang/rust/pull/43690
4672 [43728]: https://github.com/rust-lang/rust/pull/43728
4673 [43838]: https://github.com/rust-lang/rust/pull/43838
4674 [43863]: https://github.com/rust-lang/rust/pull/43863
4675 [43880]: https://github.com/rust-lang/rust/pull/43880
4676 [43911]: https://github.com/rust-lang/rust/pull/43911
4677 [43916]: https://github.com/rust-lang/rust/pull/43916
4678 [43917]: https://github.com/rust-lang/rust/pull/43917
4679 [44204]: https://github.com/rust-lang/rust/pull/44204
4680 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4681 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4682 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4683 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4684 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4685 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4686 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4687 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4688 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4690 Version 1.20.0 (2017-08-31)
4691 ===========================
4695 - [Associated constants are now stabilised.][42809]
4696 - [A lot of macro bugs are now fixed.][42913]
4701 - [Struct fields are now properly coerced to the expected field type.][42807]
4702 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4703 `wasm32-experimental-emscripten` target.
4704 - [Changed some of the error messages to be more helpful.][42033]
4705 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4707 - [rustc now reports the total number of errors on compilation failure][43015]
4708 previously this was only the number of errors in the pass that failed.
4709 - [Expansion in rustc has been sped up 29x.][42533]
4710 - [added `msp430-none-elf` target.][43099]
4711 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4713 - [Fixes backtraces on Redox][43228]
4714 - [rustc now identifies different versions of same crate when absolute paths of
4715 different types match in an error message.][42826]
4721 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4722 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4724 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4725 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4726 - [Impl `Clone` for `DefaultHasher`.][42799]
4727 - [Impl `Sync` for `SyncSender`.][42397]
4728 - [Impl `FromStr` for `char`][42271]
4729 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4731 - [allow messages in the `unimplemented!()` macro.][42155]
4732 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4733 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4734 - [Upgrade to Unicode 10.0.0][42999]
4735 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4736 - [Skip the main thread's manual stack guard on Linux][43072]
4737 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4738 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4740 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4745 - [`CStr::into_c_string`]
4746 - [`CString::as_c_str`]
4747 - [`CString::into_boxed_c_str`]
4748 - [`Chain::get_mut`]
4749 - [`Chain::get_ref`]
4750 - [`Chain::into_inner`]
4751 - [`Option::get_or_insert_with`]
4752 - [`Option::get_or_insert`]
4753 - [`OsStr::into_os_string`]
4754 - [`OsString::into_boxed_os_str`]
4757 - [`Utf8Error::error_len`]
4758 - [`char::EscapeDebug`]
4759 - [`char::escape_debug`]
4760 - [`compile_error!`]
4761 - [`f32::from_bits`]
4763 - [`f64::from_bits`]
4765 - [`mem::ManuallyDrop`]
4766 - [`slice::sort_unstable_by_key`]
4767 - [`slice::sort_unstable_by`]
4768 - [`slice::sort_unstable`]
4769 - [`str::from_boxed_utf8_unchecked`]
4770 - [`str::as_bytes_mut`]
4771 - [`str::as_bytes_mut`]
4772 - [`str::from_utf8_mut`]
4773 - [`str::from_utf8_unchecked_mut`]
4775 - [`str::get_unchecked_mut`]
4776 - [`str::get_unchecked`]
4778 - [`str::into_boxed_bytes`]
4783 - [Cargo API token location moved from `~/.cargo/config` to
4784 `~/.cargo/credentials`.][cargo/3978]
4785 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4786 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4787 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4788 - [You can now specify version of a binary when installed through
4789 `cargo install` using `--vers`.][cargo/4229]
4790 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4791 failure.][cargo/4248]
4792 - [Changed the convention around which file is the crate root.][cargo/4259]
4793 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4794 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4799 - [Functions with `'static` in their return types will now not be as usable as
4800 if they were using lifetime parameters instead.][42417]
4801 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4802 takes the sign of NaN into account where previously didn't.][42430]
4804 [42033]: https://github.com/rust-lang/rust/pull/42033
4805 [42155]: https://github.com/rust-lang/rust/pull/42155
4806 [42271]: https://github.com/rust-lang/rust/pull/42271
4807 [42397]: https://github.com/rust-lang/rust/pull/42397
4808 [42417]: https://github.com/rust-lang/rust/pull/42417
4809 [42430]: https://github.com/rust-lang/rust/pull/42430
4810 [42431]: https://github.com/rust-lang/rust/pull/42431
4811 [42533]: https://github.com/rust-lang/rust/pull/42533
4812 [42571]: https://github.com/rust-lang/rust/pull/42571
4813 [42613]: https://github.com/rust-lang/rust/pull/42613
4814 [42799]: https://github.com/rust-lang/rust/pull/42799
4815 [42807]: https://github.com/rust-lang/rust/pull/42807
4816 [42809]: https://github.com/rust-lang/rust/pull/42809
4817 [42822]: https://github.com/rust-lang/rust/pull/42822
4818 [42826]: https://github.com/rust-lang/rust/pull/42826
4819 [42854]: https://github.com/rust-lang/rust/pull/42854
4820 [42913]: https://github.com/rust-lang/rust/pull/42913
4821 [42999]: https://github.com/rust-lang/rust/pull/42999
4822 [43011]: https://github.com/rust-lang/rust/pull/43011
4823 [43015]: https://github.com/rust-lang/rust/pull/43015
4824 [43072]: https://github.com/rust-lang/rust/pull/43072
4825 [43077]: https://github.com/rust-lang/rust/pull/43077
4826 [43097]: https://github.com/rust-lang/rust/pull/43097
4827 [43099]: https://github.com/rust-lang/rust/pull/43099
4828 [43170]: https://github.com/rust-lang/rust/pull/43170
4829 [43178]: https://github.com/rust-lang/rust/pull/43178
4830 [43185]: https://github.com/rust-lang/rust/pull/43185
4831 [43228]: https://github.com/rust-lang/rust/pull/43228
4832 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4833 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4834 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4835 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4836 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4837 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4838 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4839 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4840 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4841 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4842 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4843 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4844 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4845 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4846 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4847 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4848 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4849 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4850 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4851 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4852 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4853 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4854 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4855 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4856 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4857 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4858 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4859 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4860 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4861 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4862 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4863 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4864 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4865 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4866 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4867 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4868 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4869 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4870 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4873 Version 1.19.0 (2017-07-20)
4874 ===========================
4879 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4880 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4881 - [Macro recursion limit increased to 1024 from 64.][41676]
4882 - [Added lint for detecting unused macros.][41907]
4883 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4884 For example: `let x = loop { break 7; };`
4885 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4886 contain `Copy` types and cannot have a `Drop` implementation.
4887 Example: `union Foo { bar: u8, baz: usize }`
4888 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4889 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4894 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4895 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4896 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4897 you should use `--target armv7-linux-androideabi`.
4898 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4899 - [Minor optimisation of string operations.][42037]
4900 - [Compiler error message is now `aborting due to previous error(s)` instead of
4901 `aborting due to N previous errors`][42150] This was previously inaccurate and
4902 would only count certain kinds of errors.
4903 - [The compiler now supports Visual Studio 2017][42225]
4904 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4905 - [Added a lot][42264] of [new error codes][42302]
4906 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4907 libraries with C Run-time Libraries(CRT) to be statically linked.
4908 - [Fixed various ARM codegen bugs][42740]
4913 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4914 `Extend<Cow<'a, str>>`][41449]
4915 - [`Vec` now implements `From<&mut [T]>`][41530]
4916 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4917 - [`SplitWhitespace` now implements `Clone`][41659]
4918 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4920 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4921 macros, but for printing to stderr.
4926 - [`OsString::shrink_to_fit`]
4929 - [`thread::ThreadId`]
4934 - [Build scripts can now add environment variables to the environment
4935 the crate is being compiled in.
4936 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4937 - [Subcommands now replace the current process rather than spawning a new
4938 child process][cargo/3970]
4939 - [Workspace members can now accept glob file patterns][cargo/3979]
4940 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4941 the members in a given workspace.][cargo/3988]
4942 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4943 - [Target directory path is now in the cargo metadata][cargo/4022]
4944 - [Cargo no longer checks out a local working directory for the
4945 crates.io index][cargo/4026] This should provide smaller file size for the
4946 registry, and improve cloning times, especially on Windows machines.
4947 - [Added an `--exclude` option for excluding certain packages when using the
4948 `--all` option][cargo/4031]
4949 - [Cargo will now automatically retry when receiving a 5xx error
4950 from crates.io][cargo/4032]
4951 - [The `--features` option now accepts multiple comma or space
4952 delimited values.][cargo/4084]
4953 - [Added support for custom target specific runners][cargo/3954]
4958 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4960 - [Rust will now release XZ compressed packages][rust-installer/57]
4961 - [rustup will now prefer to download rust packages with
4962 XZ compression][rustup/1100] over GZip packages.
4963 - [Added the ability to escape `#` in rust documentation][41785] By adding
4964 additional `#`'s ie. `##` is now `#`
4969 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4970 - [`-Z` flags are now no longer allowed to be used on the stable
4971 compiler.][41751] This has been a warning for a year previous to this.
4972 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4973 longer works][42844]. Users should migrate to the built-in `check`
4974 command, which has been available since 1.16.
4975 - [Ending a float literal with `._` is now a hard error.
4976 Example: `42._` .][41946]
4977 - [Any use of a private `extern crate` outside of its module is now a
4978 hard error.][36886] This was previously a warning.
4979 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4980 relative while the `::` prefix makes a path absolute, but was ignored and the
4981 path was relative regardless.
4982 - [Floating point constants in match patterns is now a hard error][36890]
4983 This was previously a warning.
4984 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4985 match patterns is now a hard error][36891] This was previously a warning.
4986 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4988 - [From the pound escape, lines consisting of multiple `#`s are
4990 - [It is an error to re-export private enum variants][42460]. This is
4991 known to break a number of crates that depend on an older version of
4993 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4994 to use it to find the linker, and the build will fail where it did
4995 not previously][42607]
4997 [36886]: https://github.com/rust-lang/rust/issues/36886
4998 [36888]: https://github.com/rust-lang/rust/issues/36888
4999 [36890]: https://github.com/rust-lang/rust/issues/36890
5000 [36891]: https://github.com/rust-lang/rust/issues/36891
5001 [36892]: https://github.com/rust-lang/rust/issues/36892
5002 [37406]: https://github.com/rust-lang/rust/issues/37406
5003 [39983]: https://github.com/rust-lang/rust/pull/39983
5004 [41145]: https://github.com/rust-lang/rust/pull/41145
5005 [41192]: https://github.com/rust-lang/rust/pull/41192
5006 [41258]: https://github.com/rust-lang/rust/pull/41258
5007 [41370]: https://github.com/rust-lang/rust/pull/41370
5008 [41449]: https://github.com/rust-lang/rust/pull/41449
5009 [41530]: https://github.com/rust-lang/rust/pull/41530
5010 [41624]: https://github.com/rust-lang/rust/pull/41624
5011 [41656]: https://github.com/rust-lang/rust/pull/41656
5012 [41659]: https://github.com/rust-lang/rust/pull/41659
5013 [41676]: https://github.com/rust-lang/rust/pull/41676
5014 [41751]: https://github.com/rust-lang/rust/pull/41751
5015 [41764]: https://github.com/rust-lang/rust/pull/41764
5016 [41785]: https://github.com/rust-lang/rust/pull/41785
5017 [41873]: https://github.com/rust-lang/rust/pull/41873
5018 [41907]: https://github.com/rust-lang/rust/pull/41907
5019 [41946]: https://github.com/rust-lang/rust/pull/41946
5020 [42016]: https://github.com/rust-lang/rust/pull/42016
5021 [42037]: https://github.com/rust-lang/rust/pull/42037
5022 [42068]: https://github.com/rust-lang/rust/pull/42068
5023 [42150]: https://github.com/rust-lang/rust/pull/42150
5024 [42162]: https://github.com/rust-lang/rust/pull/42162
5025 [42225]: https://github.com/rust-lang/rust/pull/42225
5026 [42264]: https://github.com/rust-lang/rust/pull/42264
5027 [42302]: https://github.com/rust-lang/rust/pull/42302
5028 [42460]: https://github.com/rust-lang/rust/issues/42460
5029 [42607]: https://github.com/rust-lang/rust/issues/42607
5030 [42740]: https://github.com/rust-lang/rust/pull/42740
5031 [42844]: https://github.com/rust-lang/rust/issues/42844
5032 [42948]: https://github.com/rust-lang/rust/pull/42948
5033 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5034 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5035 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5036 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5037 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5038 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5039 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5040 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5041 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5042 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5043 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5044 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5045 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5046 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5047 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5048 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5049 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5050 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5051 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5052 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5053 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5054 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5057 Version 1.18.0 (2017-06-08)
5058 ===========================
5063 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5064 make the item visible to just that module tree. Also accepts the keyword
5065 `crate` to make something public to the whole crate but not users of the
5066 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5067 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5068 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5069 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5070 types like `Write + Send`, trailing `+` are now supported in trait objects,
5071 and better error reporting for trait objects starting with `?Sized`.
5072 - [0e+10 is now a valid floating point literal][40589]
5073 - [Now warns if you bind a lifetime parameter to 'static][40734]
5074 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5075 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5076 representation in some cases.][40377]
5081 - [rustc can now emit mir with `--emit mir`][39891]
5082 - [Improved LLVM IR for trivial functions][40367]
5083 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5084 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5085 opportunities found through profiling
5086 - [Improved backtrace formatting when panicking][38165]
5091 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5092 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5093 iteration or reallocation.
5094 - [Simplified HashMap Bucket interface][40561] provides performance
5095 improvements for iterating and cloning.
5096 - [Specialize Vec::from_elem to use calloc][40409]
5097 - [Fixed Race condition in fs::create_dir_all][39799]
5098 - [No longer caching stdio on Windows][40516]
5099 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5100 2.50%~ faster and in one case now 12.50% faster.
5101 - [Optimized `AtomicBool::fetch_nand`][41143]
5106 - [`Child::try_wait`]
5107 - [`HashMap::retain`]
5108 - [`HashSet::retain`]
5110 - [`TcpStream::peek`]
5111 - [`UdpSocket::peek`]
5112 - [`UdpSocket::peek_from`]
5117 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5118 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5119 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5120 - [Added Android build support][cargo/3885]
5121 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5122 of a certain type, for example `cargo build --bins` will build all
5124 - [Added support for haiku][cargo/3952]
5129 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5130 - [Added rust-windbg script for better debugging on Windows][39983]
5131 - [Rust now uses the official cross compiler for NetBSD][40612]
5132 - [rustdoc now accepts `#` at the start of files][40828]
5133 - [Fixed jemalloc support for musl][41168]
5138 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5139 always placed after the sign if it exists and before the digits. With the `#`
5140 flag the zeroes are placed after the prefix and before the digits.
5141 - [Due to the struct field optimisation][40377], using `transmute` on structs
5142 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5143 always been undefined behavior, but is now more likely to break in practice.
5144 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5145 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5146 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5147 - [Overlapping inherent `impl`s are now a hard error][40728]
5148 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5149 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5150 `out.asm` and `out.ll` instead of only one of the filetypes.
5151 - [ calling a function that returns `Self` will no longer work][41805] when
5152 the size of `Self` cannot be statically determined.
5153 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5154 this has caused a few regressions namely:
5156 - Changed the link order of local static/dynamic libraries (respecting the
5157 order on given rather than having the compiler reorder).
5158 - Changed how MinGW is linked, native code linked to dynamic libraries
5159 may require manually linking to the gcc support library (for the native
5162 [38165]: https://github.com/rust-lang/rust/pull/38165
5163 [39799]: https://github.com/rust-lang/rust/pull/39799
5164 [39891]: https://github.com/rust-lang/rust/pull/39891
5165 [39983]: https://github.com/rust-lang/rust/pull/39983
5166 [40043]: https://github.com/rust-lang/rust/pull/40043
5167 [40241]: https://github.com/rust-lang/rust/pull/40241
5168 [40338]: https://github.com/rust-lang/rust/pull/40338
5169 [40367]: https://github.com/rust-lang/rust/pull/40367
5170 [40377]: https://github.com/rust-lang/rust/pull/40377
5171 [40409]: https://github.com/rust-lang/rust/pull/40409
5172 [40516]: https://github.com/rust-lang/rust/pull/40516
5173 [40556]: https://github.com/rust-lang/rust/pull/40556
5174 [40561]: https://github.com/rust-lang/rust/pull/40561
5175 [40589]: https://github.com/rust-lang/rust/pull/40589
5176 [40612]: https://github.com/rust-lang/rust/pull/40612
5177 [40723]: https://github.com/rust-lang/rust/pull/40723
5178 [40728]: https://github.com/rust-lang/rust/pull/40728
5179 [40731]: https://github.com/rust-lang/rust/pull/40731
5180 [40734]: https://github.com/rust-lang/rust/pull/40734
5181 [40805]: https://github.com/rust-lang/rust/pull/40805
5182 [40807]: https://github.com/rust-lang/rust/pull/40807
5183 [40828]: https://github.com/rust-lang/rust/pull/40828
5184 [40870]: https://github.com/rust-lang/rust/pull/40870
5185 [41085]: https://github.com/rust-lang/rust/pull/41085
5186 [41143]: https://github.com/rust-lang/rust/pull/41143
5187 [41168]: https://github.com/rust-lang/rust/pull/41168
5188 [41270]: https://github.com/rust-lang/rust/issues/41270
5189 [41469]: https://github.com/rust-lang/rust/pull/41469
5190 [41805]: https://github.com/rust-lang/rust/issues/41805
5191 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5192 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5193 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5194 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5195 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5196 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5197 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5198 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5199 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5200 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5201 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5202 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5203 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5204 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5207 Version 1.17.0 (2017-04-27)
5208 ===========================
5213 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5214 * [Fields of structs may be initialized without duplicating the field/variable
5215 names][39761]. [RFC 1682]
5216 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5217 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5218 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5219 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5220 `'b`. Soundness fix.
5221 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5222 * [Static variables may contain references to other statics][40027]
5227 * [Exit quickly on only `--emit dep-info`][40336]
5228 * [Make `-C relocation-model` more correctly determine whether the linker
5229 creates a position-independent executable][40245]
5230 * [Add `-C overflow-checks` to directly control whether integer overflow
5232 * [The rustc type checker now checks items on demand instead of in a single
5233 in-order pass][40008]. This is mostly an internal refactoring in support of
5234 future work, including incremental type checking, but also resolves [RFC
5235 1647], allowing `Self` to appear in `impl` `where` clauses.
5236 * [Optimize vtable loads][39995]
5237 * [Turn off vectorization for Emscripten targets][39990]
5238 * [Provide suggestions for unknown macros imported with `use`][39953]
5239 * [Fix ICEs in path resolution][39939]
5240 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5241 * [Add clearer error message using `&str + &str`][39116]
5252 * [`Ordering::then`]
5253 * [`Ordering::then_with`]
5254 * [`BTreeMap::range`]
5255 * [`BTreeMap::range_mut`]
5256 * [`collections::Bound`]
5257 * [`process::abort`]
5258 * [`ptr::read_unaligned`]
5259 * [`ptr::write_unaligned`]
5260 * [`Result::expect_err`]
5263 * [`Cell::into_inner`]
5269 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5270 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5271 * [`String` implements `FromIterator<&char>`][40028]
5272 * `Box` [implements][40009] a number of new conversions:
5273 `From<Box<str>> for String`,
5274 `From<Box<[T]>> for Vec<T>`,
5275 `From<Box<CStr>> for CString`,
5276 `From<Box<OsStr>> for OsString`,
5277 `From<Box<Path>> for PathBuf`,
5278 `Into<Box<str>> for String`,
5279 `Into<Box<[T]>> for Vec<T>`,
5280 `Into<Box<CStr>> for CString`,
5281 `Into<Box<OsStr>> for OsString`,
5282 `Into<Box<Path>> for PathBuf`,
5283 `Default for Box<str>`,
5284 `Default for Box<CStr>`,
5285 `Default for Box<OsStr>`,
5286 `From<&CStr> for Box<CStr>`,
5287 `From<&OsStr> for Box<OsStr>`,
5288 `From<&Path> for Box<Path>`
5289 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5290 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5291 * [Slightly optimize `slice::sort`][39538]
5292 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5293 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5294 `Box<str>` implements `From<&str>`][39438]
5295 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5296 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5297 * [`format!` estimates the needed capacity before writing a string][39356]
5298 * [Support unprivileged symlink creation in Windows][38921]
5299 * [`PathBuf` implements `Default`][38764]
5300 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5301 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5302 and poor hash functions.
5307 * [Add `cargo check --all`][cargo/3731]
5308 * [Add an option to ignore SSL revocation checking][cargo/3699]
5309 * [Add `cargo run --package`][cargo/3691]
5310 * [Add `required_features`][cargo/3667]
5311 * [Assume `build.rs` is a build script][cargo/3664]
5312 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5317 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5319 * [The "Unstable Book" documents nightly-only features][ubook]
5320 * [Improve the style of the sidebar in rustdoc output][40265]
5321 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5322 * [Fix MSP430 breakage due to `i128`][40257]
5323 * [Preliminary Solaris/SPARCv9 support][39903]
5324 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5325 run without installing the MSVC runtime.
5326 * [`rustdoc --test` includes file names in test names][39788]
5327 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5328 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5329 * [Initial support for `aarch64-unknown-freebsd`][39491]
5330 * [Initial support for `i686-unknown-netbsd`][39426]
5331 * [This release no longer includes the old makefile build system][39431]. Rust
5332 is built with a custom build system, written in Rust, and with Cargo.
5333 * [Add Debug implementations for libcollection structs][39002]
5334 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5335 * [`--test-threads=0` produces an error][38945]
5336 * [`rustup` installs documentation by default][40526]
5337 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5338 WinDbg and Visual Studio to improve the debugging experience.
5343 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5344 workaround, either use MSVC 2015 or run vcvars.bat.
5345 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5346 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5347 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5349 * [`format!` and `Display::to_string` panic if an underlying formatting
5350 implementation returns an error][40117]. Previously the error was silently
5351 ignored. It is incorrect for `write_fmt` to return an error when writing
5353 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5354 crates were marked stable and could be accessed from the stable toolchain.
5355 * [Rust git source no longer includes vendored crates][39728]. Those that need
5356 to build with vendored crates should build from release tarballs.
5357 * [Fix inert attributes from `proc_macro_derives`][39572]
5358 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5359 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5361 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5362 existing code generally ignores the type of dead-code unless a type-hint is
5363 provided; this can cause surprising inference interactions particularly around
5364 defaulting. The new code uniformly ignores the result type of dead-code.
5365 * [Tuple-struct constructors with private fields are no longer visible][38932]
5366 * [Lifetime parameters that do not appear in the arguments are now considered
5367 early-bound][38897], resolving a soundness bug (#[32330]). The
5368 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5370 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5371 * [Make transmuting from fn item types to pointer-sized types a hard
5374 [27787]: https://github.com/rust-lang/rust/issues/27787
5375 [32330]: https://github.com/rust-lang/rust/issues/32330
5376 [34198]: https://github.com/rust-lang/rust/pull/34198
5377 [38161]: https://github.com/rust-lang/rust/pull/38161
5378 [38368]: https://github.com/rust-lang/rust/pull/38368
5379 [38584]: https://github.com/rust-lang/rust/issues/38584
5380 [38661]: https://github.com/rust-lang/rust/pull/38661
5381 [38764]: https://github.com/rust-lang/rust/pull/38764
5382 [38864]: https://github.com/rust-lang/rust/issues/38864
5383 [38897]: https://github.com/rust-lang/rust/pull/38897
5384 [38921]: https://github.com/rust-lang/rust/pull/38921
5385 [38932]: https://github.com/rust-lang/rust/pull/38932
5386 [38945]: https://github.com/rust-lang/rust/pull/38945
5387 [38981]: https://github.com/rust-lang/rust/pull/38981
5388 [39002]: https://github.com/rust-lang/rust/pull/39002
5389 [39116]: https://github.com/rust-lang/rust/pull/39116
5390 [39193]: https://github.com/rust-lang/rust/pull/39193
5391 [39265]: https://github.com/rust-lang/rust/pull/39265
5392 [39356]: https://github.com/rust-lang/rust/pull/39356
5393 [39372]: https://github.com/rust-lang/rust/pull/39372
5394 [39426]: https://github.com/rust-lang/rust/pull/39426
5395 [39431]: https://github.com/rust-lang/rust/pull/39431
5396 [39438]: https://github.com/rust-lang/rust/pull/39438
5397 [39440]: https://github.com/rust-lang/rust/pull/39440
5398 [39485]: https://github.com/rust-lang/rust/pull/39485
5399 [39491]: https://github.com/rust-lang/rust/pull/39491
5400 [39518]: https://github.com/rust-lang/rust/pull/39518
5401 [39538]: https://github.com/rust-lang/rust/pull/39538
5402 [39572]: https://github.com/rust-lang/rust/pull/39572
5403 [39633]: https://github.com/rust-lang/rust/pull/39633
5404 [39642]: https://github.com/rust-lang/rust/pull/39642
5405 [39728]: https://github.com/rust-lang/rust/pull/39728
5406 [39761]: https://github.com/rust-lang/rust/pull/39761
5407 [39788]: https://github.com/rust-lang/rust/pull/39788
5408 [39793]: https://github.com/rust-lang/rust/pull/39793
5409 [39837]: https://github.com/rust-lang/rust/pull/39837
5410 [39843]: https://github.com/rust-lang/rust/pull/39843
5411 [39851]: https://github.com/rust-lang/rust/pull/39851
5412 [39903]: https://github.com/rust-lang/rust/pull/39903
5413 [39939]: https://github.com/rust-lang/rust/pull/39939
5414 [39953]: https://github.com/rust-lang/rust/pull/39953
5415 [39960]: https://github.com/rust-lang/rust/pull/39960
5416 [39990]: https://github.com/rust-lang/rust/pull/39990
5417 [39995]: https://github.com/rust-lang/rust/pull/39995
5418 [40008]: https://github.com/rust-lang/rust/pull/40008
5419 [40009]: https://github.com/rust-lang/rust/pull/40009
5420 [40027]: https://github.com/rust-lang/rust/pull/40027
5421 [40028]: https://github.com/rust-lang/rust/pull/40028
5422 [40037]: https://github.com/rust-lang/rust/pull/40037
5423 [40117]: https://github.com/rust-lang/rust/pull/40117
5424 [40166]: https://github.com/rust-lang/rust/pull/40166
5425 [40245]: https://github.com/rust-lang/rust/pull/40245
5426 [40257]: https://github.com/rust-lang/rust/pull/40257
5427 [40261]: https://github.com/rust-lang/rust/pull/40261
5428 [40265]: https://github.com/rust-lang/rust/pull/40265
5429 [40319]: https://github.com/rust-lang/rust/pull/40319
5430 [40336]: https://github.com/rust-lang/rust/pull/40336
5431 [40526]: https://github.com/rust-lang/rust/pull/40526
5432 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5433 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5434 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5435 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5436 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5437 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5438 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5439 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5440 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5441 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5442 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5443 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5444 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5445 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5446 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5447 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5448 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5449 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5450 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5451 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5452 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5453 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5454 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5455 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5456 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5457 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5458 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5459 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5460 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5461 [mdbook]: https://crates.io/crates/mdbook
5462 [ubook]: https://doc.rust-lang.org/unstable-book/
5465 Version 1.16.0 (2017-03-16)
5466 ===========================
5471 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5472 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5473 match patterns][38069]
5474 * [Clean up semantics of `self` in an import list][38313]
5475 * [`Self` may appear in `impl` headers][38920]
5476 * [`Self` may appear in struct expressions][39282]
5481 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5482 a `.rmeta` file containing only crate metadata][38571]. This can be
5483 used by tools like the Rust Language Service to perform
5484 metadata-only builds.
5485 * [Levenshtein based typo suggestions now work in most places, while
5486 previously they worked only for fields and sometimes for local
5487 variables][38927]. Together with the overhaul of "no
5488 resolution"/"unexpected resolution" errors (#[38154]) they result in
5489 large and systematic improvement in resolution diagnostics.
5490 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5492 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5493 * [`rustc` no longer attempts to provide "consider using an explicit
5494 lifetime" suggestions][37057]. They were inaccurate.
5499 * [`VecDeque::truncate`]
5500 * [`VecDeque::resize`]
5501 * [`String::insert_str`]
5502 * [`Duration::checked_add`]
5503 * [`Duration::checked_sub`]
5504 * [`Duration::checked_div`]
5505 * [`Duration::checked_mul`]
5508 * [`SocketAddr::is_ipv4`]
5509 * [`SocketAddr::is_ipv6`]
5510 * [`IpAddr::is_ipv4`]
5511 * [`IpAddr::is_ipv6`]
5513 * [`Vec::dedup_by_key`]
5514 * [`Result::unwrap_or_default`]
5515 * [`<*const T>::wrapping_offset`]
5516 * [`<*mut T>::wrapping_offset`]
5517 * `CommandExt::creation_flags`
5518 * [`File::set_permissions`]
5519 * [`String::split_off`]
5524 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5525 their argument by `Borrow` parameter][37761]
5526 * [All public types in std implement `Debug`][38006]
5527 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5528 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5529 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5531 * [std: Fix partial writes in `LineWriter`][38062]
5532 * [std: Clamp max read/write sizes on Unix][38062]
5533 * [Use more specific panic message for `&str` slicing errors][38066]
5534 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5535 functionality cannot be achieved in std currently.
5536 * [`writeln!`, like `println!`, now accepts a form with no string
5537 or formatting arguments, to just print a newline][38469]
5538 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5539 * [Reduce the size of static data in `std_unicode::tables`][38781]
5540 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5541 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5543 * [`Duration` implements `Sum`][38712]
5544 * [`String` implements `ToSocketAddrs`][39048]
5549 * [The `cargo check` command does a type check of a project without
5550 building it][cargo/3296]
5551 * [crates.io will display CI badges from Travis and AppVeyor, if
5552 specified in Cargo.toml][cargo/3546]
5553 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5554 * [Compilation profiles accept integer values for `debug`, in addition
5555 to `true` and `false`. These are passed to `rustc` as the value to
5556 `-C debuginfo`][cargo/3534]
5557 * [Implement `cargo --version --verbose`][cargo/3604]
5558 * [All builds now output 'dep-info' build dependencies compatible with
5559 make and ninja][cargo/3557]
5560 * [Build all workspace members with `build --all`][cargo/3511]
5561 * [Document all workspace members with `doc --all`][cargo/3515]
5562 * [Path deps outside workspace are not members][cargo/3443]
5567 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5568 the path to the Rust implementation][38589]
5569 * [The `armv7-linux-androideabi` target no longer enables NEON
5570 extensions, per Google's ABI guide][38413]
5571 * [The stock standard library can be compiled for Redox OS][38401]
5572 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5574 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5576 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5581 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5582 match patterns][38069]
5583 * In this release, references to uninhabited types can not be
5584 pattern-matched. This was accidentally allowed in 1.15.
5585 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5586 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5588 * [Clean up semantics of `self` in an import list][38313]
5589 * Reimplemented lifetime elision. This change was almost entirely compatible
5590 with existing code, but it did close a number of small bugs and loopholes,
5591 as well as being more accepting in some other [cases][41105].
5593 [37057]: https://github.com/rust-lang/rust/pull/37057
5594 [37761]: https://github.com/rust-lang/rust/pull/37761
5595 [38006]: https://github.com/rust-lang/rust/pull/38006
5596 [38051]: https://github.com/rust-lang/rust/pull/38051
5597 [38062]: https://github.com/rust-lang/rust/pull/38062
5598 [38062]: https://github.com/rust-lang/rust/pull/38622
5599 [38066]: https://github.com/rust-lang/rust/pull/38066
5600 [38069]: https://github.com/rust-lang/rust/pull/38069
5601 [38131]: https://github.com/rust-lang/rust/pull/38131
5602 [38154]: https://github.com/rust-lang/rust/pull/38154
5603 [38274]: https://github.com/rust-lang/rust/pull/38274
5604 [38304]: https://github.com/rust-lang/rust/pull/38304
5605 [38313]: https://github.com/rust-lang/rust/pull/38313
5606 [38314]: https://github.com/rust-lang/rust/pull/38314
5607 [38327]: https://github.com/rust-lang/rust/pull/38327
5608 [38401]: https://github.com/rust-lang/rust/pull/38401
5609 [38413]: https://github.com/rust-lang/rust/pull/38413
5610 [38469]: https://github.com/rust-lang/rust/pull/38469
5611 [38559]: https://github.com/rust-lang/rust/pull/38559
5612 [38571]: https://github.com/rust-lang/rust/pull/38571
5613 [38580]: https://github.com/rust-lang/rust/pull/38580
5614 [38589]: https://github.com/rust-lang/rust/pull/38589
5615 [38670]: https://github.com/rust-lang/rust/pull/38670
5616 [38712]: https://github.com/rust-lang/rust/pull/38712
5617 [38726]: https://github.com/rust-lang/rust/pull/38726
5618 [38781]: https://github.com/rust-lang/rust/pull/38781
5619 [38798]: https://github.com/rust-lang/rust/pull/38798
5620 [38909]: https://github.com/rust-lang/rust/pull/38909
5621 [38920]: https://github.com/rust-lang/rust/pull/38920
5622 [38927]: https://github.com/rust-lang/rust/pull/38927
5623 [39048]: https://github.com/rust-lang/rust/pull/39048
5624 [39282]: https://github.com/rust-lang/rust/pull/39282
5625 [39379]: https://github.com/rust-lang/rust/pull/39379
5626 [41105]: https://github.com/rust-lang/rust/issues/41105
5627 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5628 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5629 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5630 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5631 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5632 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5633 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5634 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5635 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5636 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5637 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5638 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5639 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5640 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5641 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5642 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5643 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5644 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5645 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5646 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5647 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5648 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5649 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5650 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5651 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5652 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5653 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5654 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5655 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5656 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5659 Version 1.15.1 (2017-02-09)
5660 ===========================
5662 * [Fix IntoIter::as_mut_slice's signature][39466]
5663 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5665 [39466]: https://github.com/rust-lang/rust/pull/39466
5666 [39523]: https://github.com/rust-lang/rust/pull/39523
5669 Version 1.15.0 (2017-02-02)
5670 ===========================
5675 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5676 stable. This allows popular code-generating crates like Serde and Diesel to
5677 work ergonomically. [RFC 1681].
5678 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5679 with curly braces][36868]. Part of [RFC 1506].
5680 * [A number of minor changes to name resolution have been activated][37127].
5681 They add up to more consistent semantics, allowing for future evolution of
5682 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5683 details of what is different. The breaking changes here have been transitioned
5684 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5685 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5687 * [`?Sized` can be used in `where` clauses][37791]
5688 * [There is now a limit on the size of monomorphized types and it can be
5689 modified with the `#![type_size_limit]` crate attribute, similarly to
5690 the `#![recursion_limit]` attribute][37789]
5695 * [On Windows, the compiler will apply dllimport attributes when linking to
5696 extern functions][37973]. Additional attributes and flags can control which
5697 library kind is linked and its name. [RFC 1717].
5698 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5699 * [The `--test` flag works with procedural macro crates][38107]
5700 * [Fix `extern "aapcs" fn` ABI][37814]
5701 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5702 * [The `format!` expander recognizes incorrect `printf` and shell-style
5703 formatting directives and suggests the correct format][37613].
5704 * [Only report one error for all unused imports in an import list][37456]
5706 Compiler Performance
5707 --------------------
5709 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5710 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5711 * [Don't clone in `UnificationTable::probe`][37848]
5712 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5713 * [Use small vectors in type walker][37760]
5714 * [Macro expansion performance was improved][37701]
5715 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5716 * [Replace FNV with a faster hash function][37229]
5721 * [`std::iter::Iterator::min_by`]
5722 * [`std::iter::Iterator::max_by`]
5723 * [`std::os::*::fs::FileExt`]
5724 * [`std::sync::atomic::Atomic*::get_mut`]
5725 * [`std::sync::atomic::Atomic*::into_inner`]
5726 * [`std::vec::IntoIter::as_slice`]
5727 * [`std::vec::IntoIter::as_mut_slice`]
5728 * [`std::sync::mpsc::Receiver::try_iter`]
5729 * [`std::os::unix::process::CommandExt::before_exec`]
5730 * [`std::rc::Rc::strong_count`]
5731 * [`std::rc::Rc::weak_count`]
5732 * [`std::sync::Arc::strong_count`]
5733 * [`std::sync::Arc::weak_count`]
5734 * [`std::char::encode_utf8`]
5735 * [`std::char::encode_utf16`]
5736 * [`std::cell::Ref::clone`]
5737 * [`std::io::Take::into_inner`]
5742 * [The standard sorting algorithm has been rewritten for dramatic performance
5743 improvements][38192]. It is a hybrid merge sort, drawing influences from
5744 Timsort. Previously it was a naive merge sort.
5745 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5746 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5748 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5749 and `char_indices().last()`][37882]
5750 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5751 * [Chinese characters display correctly in `fmt::Debug`][37855]
5752 * [Derive `Default` for `Duration`][37699]
5753 * [Support creation of anonymous pipes on WinXP/2k][37677]
5754 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5755 * [Don't pass overlapped handles to processes][38835]
5760 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5761 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5762 should instead check the variable at runtime with `std::env`. That the value
5763 was set at build time was a bug, and incorrect when cross-compiling. This
5764 change is known to cause breakage.
5765 * [Add `--all` flag to `cargo test`][cargo/3221]
5766 * [Compile statically against the MSVC CRT][cargo/3363]
5767 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5768 * [Link OpenSSL statically on OSX][cargo/3311]
5769 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5770 * [Test for bad path overrides with summaries][cargo/3336]
5771 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5772 * [Fix retrying crate downloads for network errors][cargo/3348]
5773 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5774 * [Emit more info on --message-format=json][cargo/3319]
5775 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5776 * [Don't ignore errors in workspace manifest][cargo/3409]
5777 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5782 * [Test runners (binaries built with `--test`) now support a `--list` argument
5783 that lists the tests it contains][38185]
5784 * [Test runners now support a `--exact` argument that makes the test filter
5785 match exactly, instead of matching only a substring of the test name][38181]
5786 * [rustdoc supports a `--playground-url` flag][37763]
5787 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5792 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5793 continue to be used in this release by passing `--disable-rustbuild` to the
5794 configure script, but they will be deleted soon. Note that the new build
5795 system uses a different on-disk layout that will likely affect any scripts
5797 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5799 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5800 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5806 * [A number of minor changes to name resolution have been activated][37127].
5807 They add up to more consistent semantics, allowing for future evolution of
5808 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5809 details of what is different. The breaking changes here have been transitioned
5810 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5811 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5812 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5813 should instead check the variable at runtime with `std::env`. That the value
5814 was set at build time was a bug, and incorrect when cross-compiling. This
5815 change is known to cause breakage.
5816 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5817 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5818 1.10 and is now an error by default. It will become a hard error in the near
5820 * [The semantics relating modules to file system directories are changing in
5821 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5822 lint, which is a warning in this release, and will become a hard error in the
5824 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5825 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5826 the underlying iterator][37834]
5828 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5829 [33685]: https://github.com/rust-lang/rust/issues/33685
5830 [36868]: https://github.com/rust-lang/rust/pull/36868
5831 [37127]: https://github.com/rust-lang/rust/pull/37127
5832 [37229]: https://github.com/rust-lang/rust/pull/37229
5833 [37456]: https://github.com/rust-lang/rust/pull/37456
5834 [37527]: https://github.com/rust-lang/rust/pull/37527
5835 [37602]: https://github.com/rust-lang/rust/pull/37602
5836 [37613]: https://github.com/rust-lang/rust/pull/37613
5837 [37615]: https://github.com/rust-lang/rust/pull/37615
5838 [37636]: https://github.com/rust-lang/rust/pull/37636
5839 [37627]: https://github.com/rust-lang/rust/pull/37627
5840 [37642]: https://github.com/rust-lang/rust/pull/37642
5841 [37677]: https://github.com/rust-lang/rust/pull/37677
5842 [37699]: https://github.com/rust-lang/rust/pull/37699
5843 [37701]: https://github.com/rust-lang/rust/pull/37701
5844 [37705]: https://github.com/rust-lang/rust/pull/37705
5845 [37749]: https://github.com/rust-lang/rust/pull/37749
5846 [37760]: https://github.com/rust-lang/rust/pull/37760
5847 [37763]: https://github.com/rust-lang/rust/pull/37763
5848 [37764]: https://github.com/rust-lang/rust/pull/37764
5849 [37789]: https://github.com/rust-lang/rust/pull/37789
5850 [37791]: https://github.com/rust-lang/rust/pull/37791
5851 [37814]: https://github.com/rust-lang/rust/pull/37814
5852 [37817]: https://github.com/rust-lang/rust/pull/37817
5853 [37834]: https://github.com/rust-lang/rust/pull/37834
5854 [37848]: https://github.com/rust-lang/rust/pull/37848
5855 [37855]: https://github.com/rust-lang/rust/pull/37855
5856 [37882]: https://github.com/rust-lang/rust/pull/37882
5857 [37888]: https://github.com/rust-lang/rust/pull/37888
5858 [37973]: https://github.com/rust-lang/rust/pull/37973
5859 [37979]: https://github.com/rust-lang/rust/pull/37979
5860 [38086]: https://github.com/rust-lang/rust/pull/38086
5861 [38107]: https://github.com/rust-lang/rust/pull/38107
5862 [38117]: https://github.com/rust-lang/rust/pull/38117
5863 [38134]: https://github.com/rust-lang/rust/pull/38134
5864 [38146]: https://github.com/rust-lang/rust/pull/38146
5865 [38181]: https://github.com/rust-lang/rust/pull/38181
5866 [38182]: https://github.com/rust-lang/rust/pull/38182
5867 [38185]: https://github.com/rust-lang/rust/pull/38185
5868 [38192]: https://github.com/rust-lang/rust/pull/38192
5869 [38279]: https://github.com/rust-lang/rust/pull/38279
5870 [38835]: https://github.com/rust-lang/rust/pull/38835
5871 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5872 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5873 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5874 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5875 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5876 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5877 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5878 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5879 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5880 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5881 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5882 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5883 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5884 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5885 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5886 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5887 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5888 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5889 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5890 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5891 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5892 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5893 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5894 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5895 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5896 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5897 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5898 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5899 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5900 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5901 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5902 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5903 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5904 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5905 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5906 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5907 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5908 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5911 Version 1.14.0 (2016-12-22)
5912 ===========================
5917 * [`..` matches multiple tuple fields in enum variants, structs
5918 and tuples][36843]. [RFC 1492].
5919 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5920 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5921 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5922 dereferencing][36822]
5927 * [Mark enums with non-zero discriminant as non-zero][37224]
5928 * [Lower-case `static mut` names are linted like other
5929 statics and consts][37162]
5930 * [Fix ICE on some macros in const integer positions
5931 (e.g. `[u8; m!()]`)][36819]
5932 * [Improve error message and snippet for "did you mean `x`"][36798]
5933 * [Add a panic-strategy field to the target specification][36794]
5934 * [Include LLVM version in `--version --verbose`][37200]
5936 Compile-time Optimizations
5937 --------------------------
5939 * [Improve macro expansion performance][37569]
5940 * [Shrink `Expr_::ExprInlineAsm`][37445]
5941 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5942 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5943 * [Avoid more allocations when compiling html5ever][37373]
5944 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5945 * [Avoid some allocations in the macro parser][37318]
5946 * [Use a faster deflate setting][37298]
5947 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5948 during interning of slices][37270]
5949 * [Optimize `write_metadata`][37267]
5950 * [Don't process obligation forest cycles when stalled][37231]
5951 * [Avoid many `CrateConfig` clones][37161]
5952 * [Optimize `Substs::super_fold_with`][37108]
5953 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5954 * [Speed up `plug_leaks`][36917]
5959 * [`println!()`, with no arguments, prints newline][36825].
5960 Previously, an empty string was required to achieve the same.
5961 * [`Wrapping` impls standard binary and unary operators, as well as
5962 the `Sum` and `Product` iterators][37356]
5963 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5965 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5966 `VecDeque` iterators][37315]
5967 * [Improve `SipHasher` performance on small values][37312]
5968 * [Add Iterator trait TrustedLen to enable better FromIterator /
5970 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5971 * [`ReadDir` implements `Debug`][37221]
5972 * [Implement `RefUnwindSafe` for atomic types][37178]
5973 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5974 * [Avoid allocations in `Decoder::read_str`][37064]
5975 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5976 * [Impl `Debug` for raw pointers to unsized data][36880]
5977 * [Don't reuse `HashMap` random seeds][37470]
5978 * [The internal memory layout of `HashMap` is more cache-friendly, for
5979 significant improvements in some operations][36692]
5980 * [`HashMap` uses less memory on 32-bit architectures][36595]
5981 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5986 * [Expose rustc cfg values to build scripts][cargo/3243]
5987 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5988 * [Fix passing --features when testing multiple packages][cargo/3280]
5989 * [Use a single profile set per workspace][cargo/3249]
5990 * [Load `replace` sections from lock files][cargo/3220]
5991 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5996 * [rustup is the recommended Rust installation method][1.14rustup]
5997 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5998 S390x. These are [tier 2] platforms and may have major defects. Follow the
5999 instructions on the website to install, or add the targets to an existing
6000 installation with `rustup target add`. The new target triples are:
6001 - `mips-unknown-linux-gnu`
6002 - `mipsel-unknown-linux-gnu`
6003 - `mips64-unknown-linux-gnuabi64`
6004 - `mips64el-unknown-linux-gnuabi64 `
6005 - `powerpc-unknown-linux-gnu`
6006 - `powerpc64-unknown-linux-gnu`
6007 - `powerpc64le-unknown-linux-gnu`
6008 - `s390x-unknown-linux-gnu `
6009 * This release includes target (std) builds for ARM Linux running MUSL
6010 libc. These are [tier 2] platforms and may have major defects. Add the
6011 following triples to an existing rustup installation with `rustup target add`:
6012 - `arm-unknown-linux-musleabi`
6013 - `arm-unknown-linux-musleabihf`
6014 - `armv7-unknown-linux-musleabihf`
6015 * This release includes [experimental support for WebAssembly][1.14wasm], via
6016 the `wasm32-unknown-emscripten` target. This target is known to have major
6017 defects. Please test, report, and fix.
6018 * rustup no longer installs documentation by default. Run `rustup
6019 component add rust-docs` to install.
6020 * [Fix line stepping in debugger][37310]
6021 * [Enable line number debuginfo in releases][37280]
6026 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6027 * [Add support for Fuchsia OS][37313]
6028 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6033 * [A number of forward-compatibility lints used by the compiler
6034 to gradually introduce language changes have been converted
6035 to deny by default][36894]:
6036 - ["use of inaccessible extern crate erroneously allowed"][36886]
6037 - ["type parameter default erroneously allowed in invalid location"][36887]
6038 - ["detects super or self keywords at the beginning of global path"][36888]
6039 - ["two overlapping inherent impls define an item with the same name
6040 were erroneously allowed"][36889]
6041 - ["floating-point constants cannot be used in patterns"][36890]
6042 - ["constants of struct or enum type can only be used in a pattern if
6043 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6044 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6045 * [Prohibit patterns in trait methods without bodies][37378]
6046 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6047 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6048 * [The `$crate` macro variable is accepted in fewer locations][37213]
6049 * [Impls specifying extra region requirements beyond the trait
6050 they implement are rejected][37167]
6051 * [Enums may not be unsized][37111]. Unsized enums are intended to
6052 work but never have. For now they are forbidden.
6053 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6055 [tier 2]: https://forge.rust-lang.org/platform-support.html
6056 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6057 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6058 [36430]: https://github.com/rust-lang/rust/pull/36430
6059 [36595]: https://github.com/rust-lang/rust/pull/36595
6060 [36595]: https://github.com/rust-lang/rust/pull/36595
6061 [36692]: https://github.com/rust-lang/rust/pull/36692
6062 [36767]: https://github.com/rust-lang/rust/pull/36767
6063 [36794]: https://github.com/rust-lang/rust/pull/36794
6064 [36798]: https://github.com/rust-lang/rust/pull/36798
6065 [36819]: https://github.com/rust-lang/rust/pull/36819
6066 [36822]: https://github.com/rust-lang/rust/pull/36822
6067 [36825]: https://github.com/rust-lang/rust/pull/36825
6068 [36843]: https://github.com/rust-lang/rust/pull/36843
6069 [36880]: https://github.com/rust-lang/rust/pull/36880
6070 [36886]: https://github.com/rust-lang/rust/issues/36886
6071 [36887]: https://github.com/rust-lang/rust/issues/36887
6072 [36888]: https://github.com/rust-lang/rust/issues/36888
6073 [36889]: https://github.com/rust-lang/rust/issues/36889
6074 [36890]: https://github.com/rust-lang/rust/issues/36890
6075 [36891]: https://github.com/rust-lang/rust/issues/36891
6076 [36892]: https://github.com/rust-lang/rust/issues/36892
6077 [36894]: https://github.com/rust-lang/rust/pull/36894
6078 [36917]: https://github.com/rust-lang/rust/pull/36917
6079 [36993]: https://github.com/rust-lang/rust/pull/36993
6080 [37037]: https://github.com/rust-lang/rust/pull/37037
6081 [37064]: https://github.com/rust-lang/rust/pull/37064
6082 [37094]: https://github.com/rust-lang/rust/pull/37094
6083 [37108]: https://github.com/rust-lang/rust/pull/37108
6084 [37111]: https://github.com/rust-lang/rust/pull/37111
6085 [37161]: https://github.com/rust-lang/rust/pull/37161
6086 [37162]: https://github.com/rust-lang/rust/pull/37162
6087 [37167]: https://github.com/rust-lang/rust/pull/37167
6088 [37178]: https://github.com/rust-lang/rust/pull/37178
6089 [37200]: https://github.com/rust-lang/rust/pull/37200
6090 [37213]: https://github.com/rust-lang/rust/pull/37213
6091 [37221]: https://github.com/rust-lang/rust/pull/37221
6092 [37224]: https://github.com/rust-lang/rust/pull/37224
6093 [37230]: https://github.com/rust-lang/rust/pull/37230
6094 [37231]: https://github.com/rust-lang/rust/pull/37231
6095 [37247]: https://github.com/rust-lang/rust/pull/37247
6096 [37267]: https://github.com/rust-lang/rust/pull/37267
6097 [37270]: https://github.com/rust-lang/rust/pull/37270
6098 [37273]: https://github.com/rust-lang/rust/pull/37273
6099 [37280]: https://github.com/rust-lang/rust/pull/37280
6100 [37298]: https://github.com/rust-lang/rust/pull/37298
6101 [37306]: https://github.com/rust-lang/rust/pull/37306
6102 [37310]: https://github.com/rust-lang/rust/pull/37310
6103 [37312]: https://github.com/rust-lang/rust/pull/37312
6104 [37313]: https://github.com/rust-lang/rust/pull/37313
6105 [37315]: https://github.com/rust-lang/rust/pull/37315
6106 [37318]: https://github.com/rust-lang/rust/pull/37318
6107 [37322]: https://github.com/rust-lang/rust/pull/37322
6108 [37326]: https://github.com/rust-lang/rust/pull/37326
6109 [37351]: https://github.com/rust-lang/rust/pull/37351
6110 [37356]: https://github.com/rust-lang/rust/pull/37356
6111 [37367]: https://github.com/rust-lang/rust/pull/37367
6112 [37373]: https://github.com/rust-lang/rust/pull/37373
6113 [37378]: https://github.com/rust-lang/rust/pull/37378
6114 [37389]: https://github.com/rust-lang/rust/pull/37389
6115 [37392]: https://github.com/rust-lang/rust/pull/37392
6116 [37427]: https://github.com/rust-lang/rust/pull/37427
6117 [37439]: https://github.com/rust-lang/rust/pull/37439
6118 [37445]: https://github.com/rust-lang/rust/pull/37445
6119 [37470]: https://github.com/rust-lang/rust/pull/37470
6120 [37569]: https://github.com/rust-lang/rust/pull/37569
6121 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6122 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6123 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6124 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6125 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6126 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6127 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6130 Version 1.13.0 (2016-11-10)
6131 ===========================
6136 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6137 errors, like the `try!` macro, described in [RFC 0243].
6138 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6139 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6140 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6141 * [Fix lifetime rules for 'if' conditions][36029]
6142 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6147 * [Add the `-C link-arg` argument][36574]
6148 * [Remove the old AST-based backend from rustc_trans][35764]
6149 * [Don't enable NEON by default on armv7 Linux][35814]
6150 * [Fix debug line number info for macro expansions][35238]
6151 * [Do not emit "class method" debuginfo for types that are not
6152 DICompositeType][36008]
6153 * [Warn about multiple conflicting #[repr] hints][34623]
6154 * [When sizing DST, don't double-count nested struct prefixes][36351]
6155 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6156 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6157 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6158 * [Expand macros without recursing to avoid stack overflows][36214]
6163 * [Replace macro backtraces with labeled local uses][35702]
6164 * [Improve error message for misplaced doc comments][33922]
6165 * [Buffer unix and lock windows to prevent message interleaving][35975]
6166 * [Update lifetime errors to specifically note temporaries][36171]
6167 * [Special case a few colors for Windows][36178]
6168 * [Suggest `use self` when such an import resolves][36289]
6169 * [Be more specific when type parameter shadows primitive type][36338]
6170 * Many minor improvements
6172 Compile-time Optimizations
6173 --------------------------
6175 * [Compute and cache HIR hashes at beginning][35854]
6176 * [Don't hash types in loan paths][36004]
6177 * [Cache projections in trans][35761]
6178 * [Optimize the parser's last token handling][36527]
6179 * [Only instantiate #[inline] functions in codegen units referencing
6180 them][36524]. This leads to big improvements in cases where crates export
6181 define many inline functions without using them directly.
6182 * [Lazily allocate TypedArena's first chunk][36592]
6183 * [Don't allocate during default HashSet creation][36734]
6190 * [`overflowing_abs`]
6191 * [`RefCell::try_borrow`]
6192 * [`RefCell::try_borrow_mut`]
6197 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6198 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6200 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6201 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6202 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6203 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6204 * [Use arc4rand on FreeBSD][35884]
6205 * [memrchr: Correct aligned offset computation][35969]
6206 * [Improve Demangling of Rust Symbols][36059]
6207 * [Use monotonic time in condition variables][35048]
6208 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6209 * [Implement conversion traits for `char`][35755]
6210 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6211 * [Zero first byte of CString on drop][36264]
6212 * [Inherit overflow checks for sum and product][36372]
6213 * [Add missing Eq implementations][36423]
6214 * [Implement `Debug` for `DirEntry`][36631]
6215 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6217 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6218 * [Implement more traits for `std::io::ErrorKind`][35911]
6219 * [Optimize BinaryHeap bounds checking][36072]
6220 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6221 `extend_with_element`][36355]
6222 * [Fix overflow checking in unsigned pow()][34942]
6227 * This release includes security fixes to both curl and OpenSSL.
6228 * [Fix transitive doctests when panic=abort][cargo/3021]
6229 * [Add --all-features flag to cargo][cargo/3038]
6230 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6231 * [Don't parse the home directory more than once][cargo/3078]
6232 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6233 * [Update OpenSSL to 1.0.2j][cargo/3121]
6234 * [Add license and license_file to cargo metadata output][cargo/3110]
6235 * [Make crates-io registry URL optional in config; ignore all changes to
6236 source.crates-io][cargo/3089]
6237 * [Don't download dependencies from other platforms][cargo/3123]
6238 * [Build transitive dev-dependencies when needed][cargo/3125]
6239 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6240 * [Avoid updating registry when adding existing deps][cargo/3144]
6241 * [Warn about path overrides that won't work][cargo/3136]
6242 * [Use workspaces during `cargo install`][cargo/3146]
6243 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6244 * [Add --message-format flag][cargo/3000]
6245 * [Pass target environment for rustdoc][cargo/3205]
6246 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6247 * [Update curl and curl-sys][cargo/3241]
6248 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6253 * [rustdoc: Add the `--sysroot` argument][36586]
6254 * [rustdoc: Fix a couple of issues with the search results][35655]
6255 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6256 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6257 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6262 * [Remove unmaintained style guide][35124]
6263 * [Add s390x support][36369]
6264 * [Initial work at Haiku OS support][36727]
6265 * [Add mips-uclibc targets][35734]
6266 * [Crate-ify compiler-rt into compiler-builtins][35021]
6267 * [Add rustc version info (git hash + date) to dist tarball][36213]
6268 * Many documentation improvements
6273 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6274 * [Deny (by default) transmuting from fn item types to pointer-sized
6275 types][34923]. Continuing the long transition to zero-sized fn items,
6277 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6279 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6280 * [Fix lifetime rules for 'if' conditions][36029].
6281 * [Inherit overflow checks for sum and product][36372].
6282 * [Forbid user-defined macros named "macro_rules"][36730].
6284 [33922]: https://github.com/rust-lang/rust/pull/33922
6285 [34623]: https://github.com/rust-lang/rust/pull/34623
6286 [34923]: https://github.com/rust-lang/rust/pull/34923
6287 [34942]: https://github.com/rust-lang/rust/pull/34942
6288 [34982]: https://github.com/rust-lang/rust/pull/34982
6289 [35021]: https://github.com/rust-lang/rust/pull/35021
6290 [35048]: https://github.com/rust-lang/rust/pull/35048
6291 [35074]: https://github.com/rust-lang/rust/pull/35074
6292 [35124]: https://github.com/rust-lang/rust/pull/35124
6293 [35234]: https://github.com/rust-lang/rust/pull/35234
6294 [35238]: https://github.com/rust-lang/rust/pull/35238
6295 [35354]: https://github.com/rust-lang/rust/pull/35354
6296 [35559]: https://github.com/rust-lang/rust/pull/35559
6297 [35585]: https://github.com/rust-lang/rust/pull/35585
6298 [35627]: https://github.com/rust-lang/rust/pull/35627
6299 [35655]: https://github.com/rust-lang/rust/pull/35655
6300 [35702]: https://github.com/rust-lang/rust/pull/35702
6301 [35707]: https://github.com/rust-lang/rust/pull/35707
6302 [35728]: https://github.com/rust-lang/rust/pull/35728
6303 [35734]: https://github.com/rust-lang/rust/pull/35734
6304 [35755]: https://github.com/rust-lang/rust/pull/35755
6305 [35761]: https://github.com/rust-lang/rust/pull/35761
6306 [35764]: https://github.com/rust-lang/rust/pull/35764
6307 [35814]: https://github.com/rust-lang/rust/pull/35814
6308 [35854]: https://github.com/rust-lang/rust/pull/35854
6309 [35871]: https://github.com/rust-lang/rust/pull/35871
6310 [35884]: https://github.com/rust-lang/rust/pull/35884
6311 [35911]: https://github.com/rust-lang/rust/pull/35911
6312 [35969]: https://github.com/rust-lang/rust/pull/35969
6313 [35975]: https://github.com/rust-lang/rust/pull/35975
6314 [36004]: https://github.com/rust-lang/rust/pull/36004
6315 [36008]: https://github.com/rust-lang/rust/pull/36008
6316 [36014]: https://github.com/rust-lang/rust/pull/36014
6317 [36029]: https://github.com/rust-lang/rust/pull/36029
6318 [36059]: https://github.com/rust-lang/rust/pull/36059
6319 [36072]: https://github.com/rust-lang/rust/pull/36072
6320 [36101]: https://github.com/rust-lang/rust/pull/36101
6321 [36104]: https://github.com/rust-lang/rust/pull/36104
6322 [36171]: https://github.com/rust-lang/rust/pull/36171
6323 [36173]: https://github.com/rust-lang/rust/pull/36173
6324 [36178]: https://github.com/rust-lang/rust/pull/36178
6325 [36213]: https://github.com/rust-lang/rust/pull/36213
6326 [36214]: https://github.com/rust-lang/rust/pull/36214
6327 [36264]: https://github.com/rust-lang/rust/pull/36264
6328 [36266]: https://github.com/rust-lang/rust/pull/36266
6329 [36289]: https://github.com/rust-lang/rust/pull/36289
6330 [36338]: https://github.com/rust-lang/rust/pull/36338
6331 [36351]: https://github.com/rust-lang/rust/pull/36351
6332 [36355]: https://github.com/rust-lang/rust/pull/36355
6333 [36369]: https://github.com/rust-lang/rust/pull/36369
6334 [36372]: https://github.com/rust-lang/rust/pull/36372
6335 [36423]: https://github.com/rust-lang/rust/pull/36423
6336 [36482]: https://github.com/rust-lang/rust/pull/36482
6337 [36505]: https://github.com/rust-lang/rust/pull/36505
6338 [36524]: https://github.com/rust-lang/rust/pull/36524
6339 [36527]: https://github.com/rust-lang/rust/pull/36527
6340 [36551]: https://github.com/rust-lang/rust/pull/36551
6341 [36574]: https://github.com/rust-lang/rust/pull/36574
6342 [36586]: https://github.com/rust-lang/rust/pull/36586
6343 [36592]: https://github.com/rust-lang/rust/pull/36592
6344 [36631]: https://github.com/rust-lang/rust/pull/36631
6345 [36639]: https://github.com/rust-lang/rust/pull/36639
6346 [36721]: https://github.com/rust-lang/rust/pull/36721
6347 [36727]: https://github.com/rust-lang/rust/pull/36727
6348 [36730]: https://github.com/rust-lang/rust/pull/36730
6349 [36734]: https://github.com/rust-lang/rust/pull/36734
6350 [36754]: https://github.com/rust-lang/rust/pull/36754
6351 [36995]: https://github.com/rust-lang/rust/pull/36995
6352 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6353 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6354 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6355 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6356 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6357 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6358 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6359 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6360 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6361 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6362 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6363 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6364 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6365 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6366 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6367 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6368 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6369 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6370 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6371 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6372 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6373 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6374 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6375 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6376 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6377 [rustup]: https://www.rustup.rs
6378 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6379 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6380 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6381 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6382 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6383 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6384 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6387 Version 1.12.1 (2016-10-20)
6388 ===========================
6393 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6394 * [Confusion with double negation and booleans][36856]
6395 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6396 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6397 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6398 * [Corrupted memory after updated to 1.12][36936]
6399 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6400 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6401 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6403 [36381]: https://github.com/rust-lang/rust/issues/36381
6404 [36856]: https://github.com/rust-lang/rust/issues/36856
6405 [36875]: https://github.com/rust-lang/rust/issues/36875
6406 [36924]: https://github.com/rust-lang/rust/issues/36924
6407 [36926]: https://github.com/rust-lang/rust/issues/36926
6408 [36936]: https://github.com/rust-lang/rust/issues/36936
6409 [37026]: https://github.com/rust-lang/rust/issues/37026
6410 [37112]: https://github.com/rust-lang/rust/issues/37112
6411 [37153]: https://github.com/rust-lang/rust/issues/37153
6414 Version 1.12.0 (2016-09-29)
6415 ===========================
6420 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6421 This translation pass is far simpler than the previous AST->LLVM pass, and
6422 creates opportunities to perform new optimizations directly on the MIR. It
6423 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6424 * [`rustc` presents a new, more readable error format, along with
6425 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6426 Most common editors supporting Rust have been updated to work with it. It was
6427 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6432 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6433 This translation pass is far simpler than the previous AST->LLVM pass, and
6434 creates opportunities to perform new optimizations directly on the MIR. It
6435 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6436 * [Print the Rust target name, not the LLVM target name, with
6437 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6438 * [The computation of `TypeId` is correct in some cases where it was previously
6439 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6440 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6441 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6442 `--print relocation-models`, and `--print code-models` print the available
6443 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6444 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6445 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6446 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6447 These targets produce statically-linked binaries. There are no binary release
6453 * [`rustc` presents a new, more readable error format, along with
6454 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6455 Most common editors supporting Rust have been updated to work with it. It was
6456 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6457 * [In error descriptions, references are now described in plain English,
6458 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6459 * [In error type descriptions, unknown numeric types are named `{integer}` or
6460 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6461 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6466 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6467 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6468 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6469 useful](https://github.com/rust-lang/rust/pull/34908)
6470 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6471 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6472 * [Semicolons are properly required as statement delimiters inside
6473 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6474 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6479 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6480 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6481 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6482 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6483 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6484 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6485 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6486 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6487 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6488 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6489 Both on Unix and Windows.
6490 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6491 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6492 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6493 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6494 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6495 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6496 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6497 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6502 * [The `format!` macro and friends now allow a single argument to be formatted
6503 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6504 * [The lifetime bounds on `[T]::binary_search_by` and
6505 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6506 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6507 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6508 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6509 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6510 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6511 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6512 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6513 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6514 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6515 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6516 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6517 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6518 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6519 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6520 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6521 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6522 * [`mpsc::sync_channel` `Receiver`s return any available message before
6523 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6524 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6525 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6530 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6531 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6532 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6533 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6534 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6535 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6536 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6537 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6538 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6539 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6540 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6541 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6542 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6543 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6544 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6545 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6550 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6551 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6556 * [Test binaries now support a `--test-threads` argument to specify the number
6557 of threads used to run tests, and which acts the same as the
6558 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6559 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6560 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6561 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6562 * [Rust releases now come with source packages that can be installed by rustup
6563 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6564 The resulting source code can be used by tools and IDES, located in the
6565 sysroot under `lib/rustlib/src`.
6570 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6571 * Many minor improvements to the documentation.
6572 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6577 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6578 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6579 * [When formatting strings, if "precision" is specified, the "fill",
6580 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6581 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6584 Version 1.11.0 (2016-08-18)
6585 ===========================
6590 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6591 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6592 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6593 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6598 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6599 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6600 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6601 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6602 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6603 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6604 (in libcore - previously stabilized in libstd)
6605 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6606 (in libcore - previously stabilized in libstd)
6607 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6608 (in libcore - previously stabilized in libstd)
6609 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6610 (in libcore - previously stabilized in libstd)
6611 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6612 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6613 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6614 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6619 * [The `thread_local!` macro supports multiple definitions in a single
6620 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6621 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6622 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6623 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6624 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6625 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6626 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6627 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6632 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6633 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6634 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6635 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6636 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6637 and `-vv` prints warnings for all crates.
6638 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6639 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6640 This provides room for expansion by arbitrary tools.
6641 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6642 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6643 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6644 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6645 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6646 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6647 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6652 * [Caching projections speeds up type check dramatically for some
6653 workloads](https://github.com/rust-lang/rust/pull/33816)
6654 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6655 This hasher is faster, but is believed to provide sufficient
6656 protection from collision attacks.
6657 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6662 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6663 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6664 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6665 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6666 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6671 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6672 * [When emitting debug info, rustc emits frame pointers for closures,
6673 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6674 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6675 * Many more errors have been given error codes and extended
6677 * API documentation continues to be improved, with many new examples
6682 * [rustc no longer hangs when dependencies recursively re-export
6683 submodules](https://github.com/rust-lang/rust/pull/34542)
6684 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6685 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6686 rewritten](https://github.com/rust-lang/rust/pull/33895)
6687 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6688 No targets use this yet, but it works toward AVR support.
6693 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6694 * [The new follow-set rules that place restrictions on `macro_rules!`
6695 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6696 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6697 and has been a warning since 1.10.
6698 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6699 This causes breakage in some corner cases.
6702 Version 1.10.0 (2016-07-07)
6703 ===========================
6708 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6709 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6710 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6711 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6712 * [`panic!` can be converted to a runtime abort with the
6713 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6714 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6715 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6716 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6717 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6718 Note that Cargo does not yet directly support cdylibs.
6723 * `os::windows::fs::OpenOptionsExt::access_mode`
6724 * `os::windows::fs::OpenOptionsExt::share_mode`
6725 * `os::windows::fs::OpenOptionsExt::custom_flags`
6726 * `os::windows::fs::OpenOptionsExt::attributes`
6727 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6728 * `os::unix::fs::OpenOptionsExt::custom_flags`
6729 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6730 * `Default for sync::Weak`
6731 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6732 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6733 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6734 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6735 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6736 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6737 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6738 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6739 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6740 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6741 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6742 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6743 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6744 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6745 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6746 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6747 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6748 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6749 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6750 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6751 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6752 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6753 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6754 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6755 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6756 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6757 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6758 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6759 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6760 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6761 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6762 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6763 * Read/Write/RawFd impls for `UnixStream`
6764 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6765 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6766 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6767 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6768 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6769 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6770 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6771 * RawFd impls for `UnixListener`
6772 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6773 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6774 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6775 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6776 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6777 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6778 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6779 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6780 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6781 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6782 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6783 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6784 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6785 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6786 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6787 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6788 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6789 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6790 * RawFd impls for `UnixDatagram`
6791 * `{BTree,Hash}Map::values_mut`
6792 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6797 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6798 The semantics of this minor method are subtle and probably not what
6800 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6801 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6802 will fall back to `/dev/urandom` temporarily to avoid blocking
6803 during early boot](https://github.com/rust-lang/rust/pull/33086).
6804 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6805 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6806 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6807 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6808 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6809 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6810 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6814 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6815 This controls the runtime behavior of the `panic!` macro
6816 and can be either "unwind" (the default), or "abort".
6817 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6818 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6819 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6820 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6821 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6822 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6823 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6824 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6825 By default they are retried twice, which can be customized with the
6826 `net.retry` value in `.cargo/config`.
6827 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6828 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6829 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6830 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6831 Makes it possible to install multiple crates in parallel.
6832 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6833 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6834 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6835 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6836 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6837 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6842 * [rustc memory usage was reduced by refactoring the context used for
6843 type checking](https://github.com/rust-lang/rust/pull/33425).
6844 * [Speed up creation of `HashMap`s by caching the random keys used
6845 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6846 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6847 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6848 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6849 10x faster than the previous lookup tables.
6850 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6855 * Many incremental improvements to documentation and rustdoc.
6856 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6857 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6858 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6859 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6860 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6861 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6862 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6867 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6868 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6869 * [`std` no longer prints backtraces on platforms where the running
6870 module must be loaded with `env::current_exe`, which can't be relied
6871 on](https://github.com/rust-lang/rust/pull/33554).
6872 * This release includes std binaries for the i586-unknown-linux-gnu,
6873 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6874 i586 target is for old x86 hardware without SSE2, and the armv7
6875 target is for Android running on modern ARM architectures.
6876 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6877 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6878 * [On Unix the runtime aborts by calling `libc::abort` instead of
6879 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6880 * [Rust is now bootstrapped from the previous release of Rust,
6881 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6886 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6887 * [`target_env` for Linux ARM targets is just `gnu`, not
6888 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6889 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6890 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6891 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6892 Affects how macros are parsed.
6893 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6894 * [Feature-gated attributes on macro-generated macro invocations are
6895 now rejected](https://github.com/rust-lang/rust/pull/32791).
6896 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6897 This caused some minor changes to type inference.
6900 Version 1.9.0 (2016-05-26)
6901 ==========================
6906 * The `#[deprecated]` attribute when applied to an API will generate
6907 warnings when used. The warnings may be suppressed with
6908 `#[allow(deprecated)]`. [RFC 1270].
6909 * [`fn` item types are zero sized, and each `fn` names a unique
6910 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6911 `transmute` on a `fn` type will generate a warning for a few cycles,
6912 then will be converted to an error.
6913 * [Field and method resolution understand visibility, so private
6914 fields and methods cannot prevent the proper use of public fields
6915 and methods][1.9fv].
6916 * [The parser considers unicode codepoints in the
6917 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6923 * [`std::panic::catch_unwind`] (renamed from `recover`)
6924 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6925 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6926 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6927 * [`str::is_char_boundary`]
6928 * [`<*const T>::as_ref`]
6929 * [`<*mut T>::as_ref`]
6930 * [`<*mut T>::as_mut`]
6931 * [`AsciiExt::make_ascii_uppercase`]
6932 * [`AsciiExt::make_ascii_lowercase`]
6933 * [`char::decode_utf16`]
6934 * [`char::DecodeUtf16`]
6935 * [`char::DecodeUtf16Error`]
6936 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6937 * [`BTreeSet::take`]
6938 * [`BTreeSet::replace`]
6941 * [`HashSet::replace`]
6943 * [`OsString::with_capacity`]
6944 * [`OsString::clear`]
6945 * [`OsString::capacity`]
6946 * [`OsString::reserve`]
6947 * [`OsString::reserve_exact`]
6948 * [`OsStr::is_empty`]
6950 * [`std::os::unix::thread`]
6953 * [`JoinHandleExt::as_pthread_t`]
6954 * [`JoinHandleExt::into_pthread_t`]
6955 * [`HashSet::hasher`]
6956 * [`HashMap::hasher`]
6957 * [`CommandExt::exec`]
6958 * [`File::try_clone`]
6959 * [`SocketAddr::set_ip`]
6960 * [`SocketAddr::set_port`]
6961 * [`SocketAddrV4::set_ip`]
6962 * [`SocketAddrV4::set_port`]
6963 * [`SocketAddrV6::set_ip`]
6964 * [`SocketAddrV6::set_port`]
6965 * [`SocketAddrV6::set_flowinfo`]
6966 * [`SocketAddrV6::set_scope_id`]
6967 * [`slice::copy_from_slice`]
6968 * [`ptr::read_volatile`]
6969 * [`ptr::write_volatile`]
6970 * [`OpenOptions::create_new`]
6971 * [`TcpStream::set_nodelay`]
6972 * [`TcpStream::nodelay`]
6973 * [`TcpStream::set_ttl`]
6974 * [`TcpStream::ttl`]
6975 * [`TcpStream::set_only_v6`]
6976 * [`TcpStream::only_v6`]
6977 * [`TcpStream::take_error`]
6978 * [`TcpStream::set_nonblocking`]
6979 * [`TcpListener::set_ttl`]
6980 * [`TcpListener::ttl`]
6981 * [`TcpListener::set_only_v6`]
6982 * [`TcpListener::only_v6`]
6983 * [`TcpListener::take_error`]
6984 * [`TcpListener::set_nonblocking`]
6985 * [`UdpSocket::set_broadcast`]
6986 * [`UdpSocket::broadcast`]
6987 * [`UdpSocket::set_multicast_loop_v4`]
6988 * [`UdpSocket::multicast_loop_v4`]
6989 * [`UdpSocket::set_multicast_ttl_v4`]
6990 * [`UdpSocket::multicast_ttl_v4`]
6991 * [`UdpSocket::set_multicast_loop_v6`]
6992 * [`UdpSocket::multicast_loop_v6`]
6993 * [`UdpSocket::set_multicast_ttl_v6`]
6994 * [`UdpSocket::multicast_ttl_v6`]
6995 * [`UdpSocket::set_ttl`]
6996 * [`UdpSocket::ttl`]
6997 * [`UdpSocket::set_only_v6`]
6998 * [`UdpSocket::only_v6`]
6999 * [`UdpSocket::join_multicast_v4`]
7000 * [`UdpSocket::join_multicast_v6`]
7001 * [`UdpSocket::leave_multicast_v4`]
7002 * [`UdpSocket::leave_multicast_v6`]
7003 * [`UdpSocket::take_error`]
7004 * [`UdpSocket::connect`]
7005 * [`UdpSocket::send`]
7006 * [`UdpSocket::recv`]
7007 * [`UdpSocket::set_nonblocking`]
7012 * [`std::sync::Once` is poisoned if its initialization function
7014 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7015 * [Most types implement `fmt::Debug`][1.9db].
7016 * [The default buffer size used by `BufReader` and `BufWriter` was
7017 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7018 used by other languages.
7019 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7020 `Duration` additionally implements `*=` and `/=`][1.9ta].
7021 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7022 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7023 * [`Chain` implements `BufRead`][1.9ch].
7024 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7029 * [Cargo can now run concurrently][1.9cc].
7030 * [Top-level overrides allow specific revisions of crates to be
7031 overridden through the entire crate graph][1.9ct]. This is intended
7032 to make upgrades easier for large projects, by allowing crates to be
7033 forked temporarily until they've been upgraded and republished.
7034 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7035 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7036 on the commandline][1.9cf]. `rustc` arguments can also be specified
7037 in the `build.rustflags` configuration key.
7042 * [The time complexity of comparing variables for equivalence during type
7043 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7044 to major compilation time improvement in some scenarios.
7045 * [`ToString` is specialized for `str`, giving it the same performance
7046 as `to_owned`][1.9ts].
7047 * [Spawning processes with `Command::output` no longer creates extra
7049 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7050 for C-like enums][1.9cl].
7055 * [Passing the `--quiet` flag to a test runner will produce
7056 much-abbreviated output][1.9q].
7057 * The Rust Project now publishes std binaries for the
7058 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7059 `i586-pc-windows-msvc` targets.
7064 * [`std::sync::Once` is poisoned if its initialization function
7066 * [It is illegal to define methods with the same name in overlapping
7067 inherent `impl` blocks][1.9sn].
7068 * [`fn` item types are zero sized, and each `fn` names a unique
7069 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7070 `transmute` on a `fn` type will generate a warning for a few cycles,
7071 then will be converted to an error.
7072 * [Improvements to const evaluation may trigger new errors when integer
7073 literals are out of range][1.9ce].
7076 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7077 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7078 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7079 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7080 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7081 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7082 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7083 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7084 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7085 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7086 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7087 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7088 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7089 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7090 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7091 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7092 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7093 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7094 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7095 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7096 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7097 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7098 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7099 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7100 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7101 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7102 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7103 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7104 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7105 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7106 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7107 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7108 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7109 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7110 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7111 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7112 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7113 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7114 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7115 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7116 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7117 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7118 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7119 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7120 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7121 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7122 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7123 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7124 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7125 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7126 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7127 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7128 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7129 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7130 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7131 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7132 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7133 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7134 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7135 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7136 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7137 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7138 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7139 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7140 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7141 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7142 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7143 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7144 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7145 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7146 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7147 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7148 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7149 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7150 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7151 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7152 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7153 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7154 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7155 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7156 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7157 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7158 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7159 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7160 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7161 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7162 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7163 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7164 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7165 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7166 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7167 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7168 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7169 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7170 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7171 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7172 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7173 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7174 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7175 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7176 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7177 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7178 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7179 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7180 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7181 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7182 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7183 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7184 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7185 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7188 Version 1.8.0 (2016-04-14)
7189 ==========================
7194 * Rust supports overloading of compound assignment statements like
7195 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7196 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7197 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7199 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7200 addition to the non-braced form, `struct Foo;`. [RFC 218].
7206 * [`str::encode_utf16`] (renamed from `utf16_units`)
7207 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7210 * [`ptr::drop_in_place`]
7212 * [`time::SystemTime`]
7214 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7215 * [`Instant::elapsed`]
7216 * [`SystemTime::now`]
7217 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7218 * [`SystemTime::elapsed`]
7219 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7220 * [`SystemTimeError`]
7221 * [`SystemTimeError::duration`]
7222 * Various impls for `SystemTimeError`
7224 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7225 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7226 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7227 * [The `write!` and `writeln!` macros correctly emit errors if any of
7228 their arguments can't be formatted][1.8w].
7229 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7230 * [The Unix-specific `raw` modules, which contain a number of
7231 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7232 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7233 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7234 across platforms was making it difficult to implement `std`
7235 correctly. Those that need these definitions should use the `libc`
7237 * The Unix-specific `MetadataExt` traits, including
7238 `os::unix::fs::MetadataExt`, which expose values such as inode
7239 numbers [no longer return platform-specific types][1.8r], but
7240 instead return widened integers. [RFC 1415].
7241 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7242 * [Atomic loads and stores are not volatile][1.8a].
7243 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7248 * [Inlining hash functions lead to a 3% compile-time improvement in
7249 some workloads][1.8h].
7250 * When using jemalloc, its symbols are [unprefixed so that it
7251 overrides the libc malloc implementation][1.8h]. This means that for
7252 rustc, LLVM is now using jemalloc, which results in a 6%
7253 compile-time improvement on a specific workload.
7254 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7259 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7260 i686-pc-windows-msvc is now considered a tier-1 platform.
7261 * [The `--print targets` flag prints a list of supported targets][1.8t].
7262 * [The `--print cfg` flag prints the `cfg`s defined for the current
7264 * [`rustc` can be built with an new Cargo-based build system, written
7265 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7266 build system. To enable it configure with `configure --rustbuild`.
7267 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7268 variants while also indicating the total number of missing variants
7269 if more than 3][1.8m].
7270 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7271 * The Rust Project now publishes binary releases of the standard
7272 library for a number of tier-2 targets:
7273 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7274 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7275 `x86_64-rumprun-netbsd`. These can be installed with
7276 tools such as [multirust][1.8mr].
7281 * [`cargo init` creates a new Cargo project in the current
7282 directory][1.8ci]. It is otherwise like `cargo new`.
7283 * [Cargo has configuration keys for `-v` and
7284 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7285 `[term]` section of `.cargo/config`.
7286 * [Configuration keys that evaluate to strings or integers can be set
7287 via environment variables][1.8ce]. For example the `build.jobs` key
7288 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7289 precedence over config files.
7290 * [Target-specific dependencies support Rust `cfg` syntax for
7291 describing targets][1.8cfg] so that dependencies for multiple
7292 targets can be specified together. [RFC 1361].
7293 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7294 `RUSTDOC` take precedence over the `build.target-dir`,
7295 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7296 * [The child process tree is killed on Windows when Cargo is
7298 * [The `build.target` configuration value sets the target platform,
7299 like `--target`][1.8ct].
7304 * [Unstable compiler flags have been further restricted][1.8u]. Since
7305 1.0 `-Z` flags have been considered unstable, and other flags that
7306 were considered unstable additionally required passing `-Z
7307 unstable-options` to access. Unlike unstable language and library
7308 features though, these options have been accessible on the stable
7309 release channel. Going forward, *new unstable flags will not be
7310 available on the stable release channel*, and old unstable flags
7311 will warn about their usage. In the future, all unstable flags will
7312 be unavailable on the stable release channel.
7313 * [It is no longer possible to `match` on empty enum variants using
7314 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7315 * The Unix-specific `MetadataExt` traits, including
7316 `os::unix::fs::MetadataExt`, which expose values such as inode
7317 numbers [no longer return platform-specific types][1.8r], but
7318 instead return widened integers. [RFC 1415].
7319 * [Modules sourced from the filesystem cannot appear within arbitrary
7320 blocks, but only within other modules][1.8mf].
7321 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7322 * On Unix, [stack overflow triggers a runtime abort instead of a
7324 * [`Command::spawn` and its equivalents return an error if any of
7325 its command-line arguments contain interior `NUL`s][1.8n].
7326 * [Tuple and unit enum variants from other crates are in the type
7328 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7329 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7330 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7331 instead of `foo.lib`.
7334 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7335 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7336 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7337 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7338 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7339 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7340 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7341 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7342 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7343 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7344 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7345 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7346 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7347 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7348 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7349 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7350 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7351 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7352 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7353 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7354 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7355 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7356 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7357 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7358 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7359 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7360 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7361 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7362 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7363 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7364 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7365 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7366 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7367 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7368 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7369 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7370 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7371 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7372 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7373 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7374 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7375 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7376 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7377 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7378 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7379 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7380 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7381 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7382 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7383 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7384 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7385 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7386 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7387 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7388 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7389 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7390 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7391 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7392 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7393 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7396 Version 1.7.0 (2016-03-03)
7397 ==========================
7404 * [`Path::strip_prefix`] (renamed from relative_from)
7405 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7407 * [`Ipv4Addr::is_loopback`]
7408 * [`Ipv4Addr::is_private`]
7409 * [`Ipv4Addr::is_link_local`]
7410 * [`Ipv4Addr::is_multicast`]
7411 * [`Ipv4Addr::is_broadcast`]
7412 * [`Ipv4Addr::is_documentation`]
7414 * [`Ipv6Addr::is_unspecified`]
7415 * [`Ipv6Addr::is_loopback`]
7416 * [`Ipv6Addr::is_multicast`]
7419 * [`Vec::as_mut_slice`]
7421 * [`String::as_str`]
7422 * [`String::as_mut_str`]
7424 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7426 * `<[T]>::`[`sort_by_key`]
7427 * checked, saturated, and overflowing operations
7428 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7429 * [`i32::saturating_mul`]
7430 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7431 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7432 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7433 * [`u32::saturating_mul`]
7434 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7435 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7436 * and checked, saturated, and overflowing operations for other primitive types
7438 * [`ffi::IntoStringError`]
7439 * [`CString::into_string`]
7440 * [`CString::into_bytes`]
7441 * [`CString::into_bytes_with_nul`]
7442 * `From<CString> for Vec<u8>`
7444 * [`IntoStringError::into_cstring`]
7445 * [`IntoStringError::utf8_error`]
7446 * `Error for IntoStringError`
7448 * [`std::hash::BuildHasher`]
7449 * [`BuildHasher::Hasher`]
7450 * [`BuildHasher::build_hasher`]
7451 * [`std::hash::BuildHasherDefault`]
7452 * [`HashMap::with_hasher`]
7453 * [`HashMap::with_capacity_and_hasher`]
7454 * [`HashSet::with_hasher`]
7455 * [`HashSet::with_capacity_and_hasher`]
7456 * [`std::collections::hash_map::RandomState`]
7457 * [`RandomState::new`]
7458 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7459 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7460 from bytes is faster.
7461 * [The performance of `LineWriter` (and thus `io::stdout`) was
7462 improved by using `memchr` to search for newlines][1.7m].
7463 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7464 `f64` variants were stabilized previously.
7465 * [`BTreeMap` was rewritten to use less memory and improve the performance
7466 of insertion and iteration, the latter by as much as 5x][1.7bm].
7467 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7468 covariant over their contained type][1.7bt].
7469 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7470 over their contained type][1.7ll].
7471 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7473 * [`Any` is implemented for unsized types][1.7a].
7474 * [`Hash` is implemented for `Duration`][1.7h].
7479 * [When running tests with `--test`, rustdoc will pass `--cfg`
7480 arguments to the compiler][1.7dt].
7481 * [The compiler is built with RPATH information by default][1.7rpa].
7482 This means that it will be possible to run `rustc` when installed in
7483 unusual configurations without configuring the dynamic linker search
7485 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7486 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7487 over `LD_LIBRARY_PATH`.
7492 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7493 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7494 * [The `rerun-if-changed` build script directive no longer causes the
7495 build script to incorrectly run twice in certain scenarios][1.7rr].
7500 * Soundness fixes to the interactions between associated types and
7501 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7502 code that violates the new rules. This is a significant change that
7503 is known to break existing code, so it has emitted warnings for the
7504 new error cases since 1.4 to give crate authors time to adapt. The
7505 details of what is changing are subtle; read the RFC for more.
7506 * [Several bugs in the compiler's visibility calculations were
7507 fixed][1.7v]. Since this was found to break significant amounts of
7508 code, the new errors will be emitted as warnings for several release
7509 cycles, under the `private_in_public` lint.
7510 * Defaulted type parameters were accidentally accepted in positions
7511 that were not intended. In this release, [defaulted type parameters
7512 appearing outside of type definitions will generate a
7513 warning][1.7d], which will become an error in future releases.
7514 * [Parsing "." as a float results in an error instead of 0][1.7p].
7515 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7516 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7518 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7519 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7520 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7521 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7522 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7523 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7524 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7525 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7526 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7527 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7528 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7529 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7530 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7531 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7532 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7533 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7534 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7535 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7536 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7537 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7538 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7539 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7540 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7541 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7542 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7543 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7544 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7545 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7546 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7547 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7548 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7549 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7550 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7551 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7552 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7553 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7554 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7555 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7556 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7557 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7558 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7559 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7560 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7561 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7562 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7563 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7564 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7565 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7566 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7567 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7568 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7569 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7570 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7571 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7572 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7573 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7574 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7575 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7576 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7577 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7578 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7579 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7580 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7581 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7582 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7583 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7584 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7585 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7586 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7587 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7588 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7589 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7590 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7591 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7592 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7593 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7594 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7595 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7596 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7599 Version 1.6.0 (2016-01-21)
7600 ==========================
7605 * The `#![no_std]` attribute causes a crate to not be linked to the
7606 standard library, but only the [core library][1.6co], as described
7607 in [RFC 1184]. The core library defines common types and traits but
7608 has no platform dependencies whatsoever, and is the basis for Rust
7609 software in environments that cannot support a full port of the
7610 standard library, such as operating systems. Most of the core
7611 library is now stable.
7617 [`Read::read_exact`],
7618 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7619 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7620 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7621 [`os::unix::fs::DirBuilderExt`],
7622 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7623 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7624 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7625 [`collections::hash_map::Drain`],
7626 [`collections::hash_map::HashMap::drain`],
7627 [`collections::hash_set::Drain`],
7628 [`collections::hash_set::HashSet::drain`],
7629 [`collections::binary_heap::Drain`],
7630 [`collections::binary_heap::BinaryHeap::drain`],
7631 [`Vec::extend_from_slice`] (renamed from `push_all`),
7632 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7633 [`RwLock::into_inner`],
7634 [`Iterator::min_by_key`] (renamed from `min_by`),
7635 [`Iterator::max_by_key`] (renamed from `max_by`).
7636 * The [core library][1.6co] is stable, as are most of its APIs.
7637 * [The `assert_eq!` macro supports arguments that don't implement
7638 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7640 * Several timer functions that take duration in milliseconds [are
7641 deprecated in favor of those that take `Duration`][1.6ms]. These
7642 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7643 `thread::park_timeout_ms`.
7644 * The algorithm by which `Vec` reserves additional elements was
7645 [tweaked to not allocate excessive space][1.6a] while still growing
7647 * `From` conversions are [implemented from integers to floats][1.6f]
7648 in cases where the conversion is lossless. Thus they are not
7649 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7650 or `f64`. They are also not implemented for `isize` and `usize`
7651 because the implementations would be platform-specific. `From` is
7652 also implemented from `f32` to `f64`.
7653 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7654 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7655 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7656 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7658 * Sorting slices that are already sorted [is 50% faster in some
7664 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7665 * Cargo build scripts can specify their dependencies by emitting the
7666 [`rerun-if-changed`][1.6rr] key.
7667 * crates.io will reject publication of crates with dependencies that
7668 have a wildcard version constraint. Crates with wildcard
7669 dependencies were seen to cause a variety of problems, as described
7670 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7672 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7673 release folder. A variety of artifacts that Cargo failed to clean
7674 are now correctly deleted.
7679 * The `unreachable_code` lint [warns when a function call's argument
7681 * The parser indicates [failures that may be caused by
7682 confusingly-similar Unicode characters][1.6uc]
7683 * Certain macro errors [are reported at definition time][1.6m], not
7689 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7690 environment variable when locating crates. This was a pre-cargo
7691 feature for integrating with the package manager that was
7692 accidentally never removed.
7693 * [A number of bugs were fixed in the privacy checker][1.6p] that
7694 could cause previously-accepted code to break.
7695 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7696 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7697 struct pattern syntax (`Foo(..)`) can no longer be used to match
7698 unit structs. This is a warning now, but will become an error in
7699 future releases. Patterns that share the same name as a const are
7701 * A bug was fixed that causes [rustc not to apply default type
7702 parameters][1.6xc] when resolving certain method implementations of
7703 traits defined in other crates.
7705 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7706 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7707 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7708 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7709 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7710 [1.6co]: http://doc.rust-lang.org/core/index.html
7711 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7712 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7713 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7714 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7715 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7716 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7717 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7718 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7719 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7720 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7721 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7722 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7723 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7724 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7725 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7726 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7727 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7728 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7729 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7730 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7731 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7732 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7733 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7734 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7735 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7736 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7737 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7738 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7739 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7740 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7741 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7742 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7743 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7744 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7745 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7746 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7747 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7748 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7749 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7750 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7751 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7754 Version 1.5.0 (2015-12-10)
7755 ==========================
7757 * ~700 changes, numerous bugfixes
7763 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7764 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7765 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7766 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7767 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7768 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7769 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7770 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7771 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7772 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7773 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7774 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7775 [`Path::read_link`], [`Path::symlink_metadata`],
7776 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7777 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7778 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7779 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7780 [`slice::split_first_mut`], [`slice::split_first`],
7781 [`slice::split_last_mut`], [`slice::split_last`],
7782 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7783 [`str::MatchIndices`], [`str::RMatchIndices`],
7784 [`str::match_indices`], [`str::rmatch_indices`],
7785 [`str::slice_mut_unchecked`], [`string::ParseError`].
7786 * Rust applications hosted on crates.io can be installed locally to
7787 `~/.cargo/bin` with the [`cargo install`] command. Among other
7788 things this makes it easier to augment Cargo with new subcommands:
7789 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7790 invoked as `cargo foo`.
7791 * Crates with wildcard (`*`) dependencies will [emit warnings when
7792 published][1.5w]. In 1.6 it will no longer be possible to publish
7793 crates with wildcard dependencies.
7798 * The rules determining when a particular lifetime must outlive
7799 a particular value (known as '[dropck]') have been [modified
7800 to not rely on parametricity][1.5p].
7801 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7802 and `Arc`][1.5a]. Because these smart pointer types implement
7803 `Deref`, this causes breakage in cases where the interior type
7804 contains methods of the same name.
7805 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7806 that they could drop their content. Soundness fix.
7807 * All method invocations are [properly checked][1.5wf1] for
7808 [well-formedness][1.5wf2]. Soundness fix.
7809 * Traits whose supertraits contain `Self` are [not object
7810 safe][1.5o]. Soundness fix.
7811 * Target specifications support a [`no_default_libraries`][1.5nd]
7812 setting that controls whether `-nodefaultlibs` is passed to the
7813 linker, and in turn the `is_like_windows` setting no longer affects
7814 the `-nodefaultlibs` flag.
7815 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7816 * The `#[inline]` and `#[repr]` attributes [can only appear
7817 in valid locations][1.5at].
7818 * Native libraries linked from the local crate are [passed to
7819 the linker before native libraries from upstream crates][1.5nl].
7820 * Two rarely-used attributes, `#[no_debug]` and
7821 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7822 * Negation of unsigned integers, which has been a warning for
7823 several releases, [is now behind a feature gate and will
7824 generate errors][1.5nu].
7825 * The parser accidentally accepted visibility modifiers on
7826 enum variants, a bug [which has been fixed][1.5ev].
7827 * [A bug was fixed that allowed `use` statements to import unstable
7833 * When evaluating expressions at compile-time that are not
7834 compile-time constants (const-evaluating expressions in non-const
7835 contexts), incorrect code such as overlong bitshifts and arithmetic
7836 overflow will [generate a warning instead of an error][1.5ce],
7837 delaying the error until runtime. This will allow the
7838 const-evaluator to be expanded in the future backwards-compatibly.
7839 * The `improper_ctypes` lint [no longer warns about using `isize` and
7840 `usize` in FFI][1.5ict].
7845 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7847 * `Default` is [implemented for mutable slices][1.5d].
7848 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7849 * There are now `From` conversions [between floating point
7850 types][1.5f] where the conversions are lossless.
7851 * There are now `From` conversions [between integer types][1.5i] where
7852 the conversions are lossless.
7853 * [`fs::Metadata` implements `Clone`][1.5fs].
7854 * The `parse` method [accepts a leading "+" when parsing
7856 * [`AsMut` is implemented for `Vec`][1.5am].
7857 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7858 been optimized][1.5cf] and no longer rely on the default impl.
7859 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7860 `unsafe extern "C"` function types now [implement `Clone`,
7861 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7862 `fmt::Debug` for up to 12 arguments][1.5fp].
7863 * [Dropping `Vec`s is much faster in unoptimized builds when the
7864 element types don't implement `Drop`][1.5dv].
7865 * A bug that caused in incorrect behavior when [combining `VecDeque`
7866 with zero-sized types][1.5vdz] was resolved.
7867 * [`PartialOrd` for slices is faster][1.5po].
7872 * [Crate metadata size was reduced by 20%][1.5md].
7873 * [Improvements to code generation reduced the size of libcore by 3.3
7874 MB and rustc's memory usage by 18MB][1.5m].
7875 * [Improvements to deref translation increased performance in
7876 unoptimized builds][1.5dr].
7877 * Various errors in trait resolution [are deduplicated to only be
7878 reported once][1.5te].
7879 * Rust has preliminary [support for rumprun kernels][1.5rr].
7880 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7882 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7883 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7884 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7885 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7886 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7887 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7888 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7889 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7890 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7891 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7892 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7893 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7894 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7895 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7896 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7897 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7898 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7899 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7900 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7901 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7902 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7903 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7904 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7905 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7906 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7907 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7908 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7909 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7910 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7911 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7912 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7913 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7914 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7915 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7916 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7917 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7918 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7919 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7920 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7921 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7922 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7923 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7924 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7925 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7926 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7927 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7928 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7929 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7930 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7931 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7932 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7933 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7934 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7935 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7936 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7937 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7938 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7939 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7940 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7941 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7942 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7943 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7944 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7945 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7946 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7947 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7948 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7949 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7950 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7951 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7952 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7953 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7954 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7955 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7956 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7957 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7958 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7959 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7960 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7961 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7962 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7963 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7964 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7965 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7966 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7967 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7968 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7969 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7970 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7972 Version 1.4.0 (2015-10-29)
7973 ==========================
7975 * ~1200 changes, numerous bugfixes
7980 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7981 GNU) are now supported and recommended for use.
7986 * [Several changes have been made to fix type soundness and improve
7987 the behavior of associated types][sound]. See [RFC 1214]. Although
7988 we have mostly introduced these changes as warnings this release, to
7989 become errors next release, there are still some scenarios that will
7990 see immediate breakage.
7991 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7992 line breaks in addition to `\n`][crlf].
7993 * [Loans of `'static` lifetime extend to the end of a function][stat].
7994 * [`str::parse` no longer introduces avoidable rounding error when
7995 parsing floating point numbers. Together with earlier changes to
7996 float formatting/output, "round trips" like f.to_string().parse()
7997 now preserve the value of f exactly. Additionally, leading plus
7998 signs are now accepted][fp3].
8004 * `use` statements that import multiple items [can now rename
8005 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8006 * [Binops work correctly on fat pointers][binfat].
8007 * `pub extern crate`, which does not behave as expected, [issues a
8008 warning][pec] until a better solution is found.
8013 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8014 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8015 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8016 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8017 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8018 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8019 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8020 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8021 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8022 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8023 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8024 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8025 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8026 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8027 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8028 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8029 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8030 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8032 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8033 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8034 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8035 `f64::from_str_radix`.
8036 * [Reverse-searching strings is faster with the 'two-way'
8038 * [`std::io::copy` allows `?Sized` arguments][cc].
8039 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8040 [override `count`, `nth` and `last` with an O(1)
8041 implementation][it].
8042 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8043 * [`IntoRawFd` has been added to the Unix-specific prelude,
8044 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8046 * [`Extend<String>` and `FromIterator<String` are both implemented for
8048 * [`IntoIterator` is implemented for references to `Option` and
8050 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8051 Copy`][ext] as part of [RFC 839]. This will cause type inference
8052 breakage in rare situations.
8053 * [`BinaryHeap` implements `Debug`][bh2].
8054 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8056 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8057 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8058 * [String comparison is faster][faststr].
8059 * `&mut T` where `T: std::fmt::Write` [also implements
8060 `std::fmt::Write`][mutw].
8061 * [A stable regression in `VecDeque::push_back` and other
8062 capacity-altering methods that caused panics for zero-sized types
8064 * [Function pointers implement traits for up to 12 parameters][fp2].
8069 * The compiler [no longer uses the 'morestack' feature to prevent
8070 stack overflow][mm]. Instead it uses guard pages and stack
8071 probes (though stack probes are not yet implemented on any platform
8073 * [The compiler matches traits faster when projections are involved][p].
8074 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8076 * [Cargo now displays useful information about what its doing during
8077 `cargo update`][cu].
8079 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8080 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8081 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8082 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8083 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8084 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8085 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8086 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8087 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8088 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8089 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8090 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8091 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8092 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8093 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8094 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8095 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8096 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8097 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8098 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8099 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8100 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8101 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8102 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8103 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8104 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8105 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8106 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8107 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8108 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8109 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8110 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8111 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8112 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8113 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8114 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8115 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8116 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8117 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8118 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8119 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8120 [bh2]: https://github.com/rust-lang/rust/pull/28156
8121 [binfat]: https://github.com/rust-lang/rust/pull/28270
8122 [bm]: https://github.com/rust-lang/rust/pull/28197
8123 [cc]: https://github.com/rust-lang/rust/pull/27531
8124 [crlf]: https://github.com/rust-lang/rust/pull/28034
8125 [cu]: https://github.com/rust-lang/cargo/pull/1931
8126 [d]: https://github.com/rust-lang/rust/pull/27825
8127 [dep]: https://github.com/rust-lang/rust/pull/28339
8128 [es]: https://github.com/rust-lang/rust/pull/27956
8129 [ext]: https://github.com/rust-lang/rust/pull/28094
8130 [faststr]: https://github.com/rust-lang/rust/pull/28338
8131 [ffi]: https://github.com/rust-lang/rust/pull/28779
8132 [fp]: https://github.com/rust-lang/rust/pull/28268
8133 [fp2]: https://github.com/rust-lang/rust/pull/28560
8134 [fp3]: https://github.com/rust-lang/rust/pull/27307
8135 [i]: https://github.com/rust-lang/rust/pull/27451
8136 [into2]: https://github.com/rust-lang/rust/pull/28039
8137 [it]: https://github.com/rust-lang/rust/pull/27652
8138 [mm]: https://github.com/rust-lang/rust/pull/27338
8139 [mutw]: https://github.com/rust-lang/rust/pull/28368
8140 [sound]: https://github.com/rust-lang/rust/pull/27641
8141 [p]: https://github.com/rust-lang/rust/pull/27866
8142 [pec]: https://github.com/rust-lang/rust/pull/28486
8143 [pr]: https://github.com/rust-lang/rust/pull/27896
8144 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8145 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8146 [s]: https://github.com/rust-lang/rust/pull/27474
8147 [stab]: https://github.com/rust-lang/rust/pull/28339
8148 [stat]: https://github.com/rust-lang/rust/pull/28321
8149 [vd]: https://github.com/rust-lang/rust/pull/28494
8151 Version 1.3.0 (2015-09-17)
8152 ==============================
8154 * ~900 changes, numerous bugfixes
8159 * The [new object lifetime defaults][nold] have been [turned
8160 on][nold2] after a cycle of warnings about the change. Now types
8161 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8162 being interpreted as `&'a Box<Trait+'a>` to `&'a
8163 Box<Trait+'static>`.
8164 * [The Rustonomicon][nom] is a new book in the official documentation
8165 that dives into writing unsafe Rust.
8166 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8167 timekeeping is employed by other std APIs, as well as out-of-tree
8173 * The [new object lifetime defaults][nold] have been [turned
8174 on][nold2] after a cycle of warnings about the change.
8175 * There is a known [regression][lr] in how object lifetime elision is
8176 interpreted, the proper solution for which is undetermined.
8177 * The `#[prelude_import]` attribute, an internal implementation
8178 detail, was accidentally stabilized previously. [It has been put
8179 behind the `prelude_import` feature gate][pi]. This change is
8180 believed to break no existing code.
8181 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8182 [more sane for dynamically sized types][dst3]. Code that relied on
8183 the previous behavior is thought to be broken.
8184 * The `dropck` rules, which checks that destructors can't access
8185 destroyed values, [have been updated][dropck] to match the
8186 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8187 cause some previously-compiling code to no longer build.
8192 * The [new object lifetime defaults][nold] have been [turned
8193 on][nold2] after a cycle of warnings about the change.
8194 * Semicolons may [now follow types and paths in
8195 macros](https://github.com/rust-lang/rust/pull/27000).
8196 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8197 [more sane for dynamically sized types][dst3]. Code that relied on
8198 the previous behavior is not known to exist, and suspected to be
8200 * `'static` variables [may now be recursive][st].
8201 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8202 implementations correctly.
8203 * The `dropck` rules, which checks that destructors can't access
8204 destroyed values, [have been updated][dropck] to match the
8210 * The [`Duration`] API, [has been stabilized][ds], as well as the
8211 `std::time` module, which presently contains only `Duration`.
8212 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8213 * The owned C string, [`CString`], implements [`Borrow`] and the
8214 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8215 these allow C strings to be borrowed and cloned in generic code.
8216 * [`CStr`] implements [`Debug`].
8217 * [`AtomicPtr`] implements [`Debug`].
8218 * [`Error`] trait objects [can be downcast to their concrete types][e]
8219 in many common configurations, using the [`is`], [`downcast`],
8220 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8222 * Searching for substrings now [employs the two-way algorithm][search]
8223 instead of doing a naive search. This gives major speedups to a
8224 number of methods, including [`contains`][sc], [`find`][sf],
8225 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8226 [`ends_with`][sew] are also faster.
8227 * The performance of `PartialEq` for slices is [much faster][ps].
8228 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8229 is overridden and optimized by the implementations for scalars.
8230 * The [`Hasher`] trait now has a number of specialized `write_*`
8231 methods for primitive types, for efficiency.
8232 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8233 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8234 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8235 of [`std::error::Error::cause`][iec] also delegates to the inner
8237 * [`process::Child`][pc] gained the [`id`] method, which returns a
8238 `u32` representing the platform-specific process identifier.
8239 * The [`connect`] method on slices is deprecated, replaced by the new
8240 [`join`] method (note that both of these are on the *unstable*
8241 [`SliceConcatExt`] trait, but through the magic of the prelude are
8242 available to stable code anyway).
8243 * The [`Div`] operator is implemented for [`Wrapping`] types.
8244 * [`DerefMut` is implemented for `String`][dms].
8245 * Performance of SipHash (the default hasher for `HashMap`) is
8246 [better for long data][sh].
8247 * [`AtomicPtr`] implements [`Send`].
8248 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8249 are now [specialized to use uninitialized buffers for increased
8251 * Lifetime parameters of foreign functions [are now resolved
8257 * Rust can now, with some coercion, [produce programs that run on
8258 Windows XP][xp], though XP is not considered a supported platform.
8259 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8260 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8261 recommended for use in 1.3, though should be fully-functional
8262 in the [64-bit 1.4 beta][b14].
8263 * On Fedora-based systems installation will [properly configure the
8264 dynamic linker][fl].
8265 * The compiler gained many new extended error descriptions, which can
8266 be accessed with the `--explain` flag.
8267 * The `dropck` pass, which checks that destructors can't access
8268 destroyed values, [has been rewritten][dropck]. This fixes some
8269 soundness holes, and as such will cause some previously-compiling
8270 code to no longer build.
8271 * `rustc` now uses [LLVM to write archive files where possible][ar].
8272 Eventually this will eliminate the compiler's dependency on the ar
8274 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8275 supported FreeBSD on x86_64).
8276 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8277 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8279 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8280 will kill the process instead of leaking][nlp].
8282 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8283 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8284 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8285 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8286 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8287 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8288 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8289 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8290 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8291 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8292 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8293 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8294 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8295 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8296 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8297 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8298 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8299 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8300 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8301 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8302 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8303 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8304 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8305 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8306 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8307 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8308 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8309 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8310 [ar]: https://github.com/rust-lang/rust/pull/26926
8311 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8312 [dms]: https://github.com/rust-lang/rust/pull/26241
8313 [dropck]: https://github.com/rust-lang/rust/pull/27261
8314 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8315 [ds]: https://github.com/rust-lang/rust/pull/26818
8316 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8317 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8318 [dst3]: https://github.com/rust-lang/rust/pull/27351
8319 [e]: https://github.com/rust-lang/rust/pull/24793
8320 [f]: https://github.com/rust-lang/rust/pull/26588
8321 [fb]: https://github.com/rust-lang/rust/pull/26959
8322 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8323 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8324 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8325 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8326 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8327 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8328 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8329 [lic]: https://github.com/rust-lang/rust/pull/26583
8330 [lnu]: https://github.com/rust-lang/rust/pull/27026
8331 [lr]: https://github.com/rust-lang/rust/issues/27248
8332 [lum]: https://github.com/rust-lang/rust/pull/26378
8333 [lur]: https://github.com/rust-lang/rust/pull/26783
8334 [nlp]: https://github.com/rust-lang/rust/pull/27176
8335 [nold2]: https://github.com/rust-lang/rust/pull/27045
8336 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8337 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8338 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8339 [pi]: https://github.com/rust-lang/rust/pull/26699
8340 [ps]: https://github.com/rust-lang/rust/pull/26884
8341 [rte]: https://github.com/rust-lang/rust/pull/26950
8342 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8343 [search]: https://github.com/rust-lang/rust/pull/26327
8344 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8345 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8346 [sh]: https://github.com/rust-lang/rust/pull/27280
8347 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8348 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8349 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8350 [st]: https://github.com/rust-lang/rust/pull/26630
8351 [win1]: https://github.com/rust-lang/rust/pull/26569
8352 [win2]: https://github.com/rust-lang/rust/pull/26741
8353 [win3]: https://github.com/rust-lang/rust/pull/26741
8354 [win4]: https://github.com/rust-lang/rust/pull/27210
8355 [xp]: https://github.com/rust-lang/rust/pull/26569
8357 Version 1.2.0 (2015-08-07)
8358 ==========================
8360 * ~1200 changes, numerous bugfixes
8365 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8366 like `Rc` to contain types without a fixed size, arrays and trait
8367 objects, finally enabling use of `Rc<[T]>` and completing the
8368 implementation of DST.
8369 * [Parallel codegen][parcodegen] is now working again, which can
8370 substantially speed up large builds in debug mode; It also gets
8371 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8372 jobs). It's not enabled by default, but will be "in the near
8373 future". It can be activated with the `-C codegen-units=N` flag to
8375 * This is the first release with [experimental support for linking
8376 with the MSVC linker and lib C on Windows (instead of using the GNU
8377 variants via MinGW)][win]. It is yet recommended only for the most
8378 intrepid Rustaceans.
8379 * Benchmark compilations are showing a 30% improvement in
8380 bootstrapping over 1.1.
8385 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8386 unicode case mapping, which is a previously-planned change in
8387 behavior and considered a bugfix.
8388 * [`mem::align_of`] now specifies [the *minimum alignment* for
8389 T][align], which is usually the alignment programs are interested
8390 in, and the same value reported by clang's
8391 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8393 * [The `#[packed]` attribute is no longer silently accepted by the
8394 compiler][packed]. This attribute did nothing and code that
8395 mentioned it likely did not work as intended.
8396 * Associated type defaults are [now behind the
8397 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8398 defaults *did not work*, but could be mentioned syntactically. As
8399 such this breakage has minimal impact.
8404 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8405 matching against dereferenceable values.
8410 * The [`Extend`] trait, which grows a collection from an iterator, is
8411 implemented over iterators of references, for `String`, `Vec`,
8412 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8413 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8414 * The [`iter::once`] function returns an iterator that yields a single
8415 element, and [`iter::empty`] returns an iterator that yields no
8417 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8418 over substring matches.
8419 * [`Cell`] and [`RefCell`] both implement `Eq`.
8420 * A number of methods for wrapping arithmetic are added to the
8421 integral types, [`wrapping_div`], [`wrapping_rem`],
8422 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8423 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8424 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8425 type.. It is illegal for the default arithmetic operations in Rust
8426 to overflow; the desire to wrap must be explicit.
8427 * The `{:#?}` formatting specifier [displays the alternate,
8428 pretty-printed][debugfmt] form of the `Debug` formatter. This
8429 feature was actually introduced prior to 1.0 with little
8431 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8432 for writing data to formatted strings, similar to [`io::Write`].
8433 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8434 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8435 are used by code generators to emit implementations of [`Debug`].
8436 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8437 methods that convert case, following Unicode case mapping.
8438 * It is now easier to handle poisoned locks. The [`PoisonError`]
8439 type, returned by failing lock operations, exposes `into_inner`,
8440 `get_ref`, and `get_mut`, which all give access to the inner lock
8441 guard, and allow the poisoned lock to continue to operate. The
8442 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8443 poisoned lock without attempting to take the lock.
8444 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8445 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8446 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8447 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8449 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8455 * `rustc` employs smarter heuristics for guessing at [typos].
8456 * `rustc` emits more efficient code for [no-op conversions between
8457 unsafe pointers][nop].
8458 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8459 resulting in faster compile times and smaller code.
8461 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8462 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8463 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8464 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8465 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8466 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8467 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8468 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8469 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8470 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8471 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8472 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8473 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8474 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8475 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8476 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8477 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8478 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8479 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8480 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8481 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8482 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8483 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8484 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8485 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8486 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8487 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8488 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8489 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8490 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8491 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8492 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8493 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8494 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8495 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8496 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8497 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8498 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8499 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8500 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8501 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8502 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8503 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8504 [align]: https://github.com/rust-lang/rust/pull/25646
8505 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8506 [typos]: https://github.com/rust-lang/rust/pull/26087
8507 [nop]: https://github.com/rust-lang/rust/pull/26336
8508 [fat]: https://github.com/rust-lang/rust/pull/26411
8509 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8510 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8511 [packed]: https://github.com/rust-lang/rust/pull/25541
8512 [ad]: https://github.com/rust-lang/rust/pull/27382
8513 [win]: https://github.com/rust-lang/rust/pull/25350
8515 Version 1.1.0 (2015-06-25)
8516 =========================
8518 * ~850 changes, numerous bugfixes
8523 * The [`std::fs` module has been expanded][fs] to expand the set of
8524 functionality exposed:
8525 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8526 don't incur a syscall on some platforms.
8527 * A `symlink_metadata` function has been added.
8528 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8529 access to all underlying information.
8530 * The compiler now contains extended explanations of many errors. When an error
8531 with an explanation occurs the compiler suggests using the `--explain` flag
8532 to read the explanation. Error explanations are also [available online][err-index].
8533 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8534 well as other work, the time to bootstrap the compiler decreased by
8540 * The [`str::split_whitespace`] method splits a string on unicode
8541 whitespace boundaries.
8542 * On both Windows and Unix, new extension traits provide conversion of
8543 I/O types to and from the underlying system handles. On Unix, these
8544 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8545 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8546 `TcpListener`, and `UpdSocket`. Further implementations for
8547 `std::process` will be stabilized later.
8548 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8549 Windows, symlinks can be created with
8550 `std::os::windows::symlink_dir` and
8551 `std::os::windows::symlink_file`.
8552 * The `mpsc::Receiver` type can now be converted into an iterator with
8553 `into_iter` on the [`IntoIterator`] trait.
8554 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8555 implementation of the [`From`] trait.
8556 * The `Debug` implementation for `RangeFull` [creates output that is
8557 more consistent with other implementations][rf].
8558 * [`Debug` is implemented for `File`][file].
8559 * The `Default` implementation for `Arc` [no longer requires `Sync +
8561 * [The `Iterator` methods `count`, `nth`, and `last` have been
8562 overridden for slices to have O(1) performance instead of O(n)][si].
8563 * Incorrect handling of paths on Windows has been improved in both the
8564 compiler and the standard library.
8565 * [`AtomicPtr` gained a `Default` implementation][ap].
8566 * In accordance with Rust's policy on arithmetic overflow `abs` now
8567 [panics on overflow when debug assertions are enabled][abs].
8568 * The [`Cloned`] iterator, which was accidentally left unstable for
8569 1.0 [has been stabilized][c].
8570 * The [`Incoming`] iterator, which iterates over incoming TCP
8571 connections, and which was accidentally unnamable in 1.0, [is now
8572 properly exported][inc].
8573 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8574 `sift_up` or `sift_down` panic][bh].
8575 * The [`split_off`] method of `LinkedList` [no longer corrupts
8576 the list in certain scenarios][ll].
8581 * Type checking performance [has improved notably][sk] with
8582 [multiple improvements][pre].
8583 * The compiler [suggests code changes][ch] for more errors.
8584 * rustc and it's build system have experimental support for [building
8585 toolchains against MUSL][m] instead of glibc on Linux.
8586 * The compiler defines the `target_env` cfg value, which is used for
8587 distinguishing toolchains that are otherwise for the same
8588 platform. Presently this is set to `gnu` for common GNU Linux
8589 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8590 * The [`cargo rustc`][crc] command invokes a build with custom flags
8592 * [Android executables are always position independent][pie].
8593 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8596 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8597 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8598 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8599 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8600 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8601 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8602 [rf]: https://github.com/rust-lang/rust/pull/24491
8603 [err-index]: https://doc.rust-lang.org/error-index.html
8604 [sk]: https://github.com/rust-lang/rust/pull/24615
8605 [pre]: https://github.com/rust-lang/rust/pull/25323
8606 [file]: https://github.com/rust-lang/rust/pull/24598
8607 [ch]: https://github.com/rust-lang/rust/pull/24683
8608 [arc]: https://github.com/rust-lang/rust/pull/24695
8609 [si]: https://github.com/rust-lang/rust/pull/24701
8610 [ap]: https://github.com/rust-lang/rust/pull/24834
8611 [m]: https://github.com/rust-lang/rust/pull/24777
8612 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8613 [crc]: https://github.com/rust-lang/cargo/pull/1568
8614 [pie]: https://github.com/rust-lang/rust/pull/24953
8615 [abs]: https://github.com/rust-lang/rust/pull/25441
8616 [c]: https://github.com/rust-lang/rust/pull/25496
8617 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8618 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8619 [inc]: https://github.com/rust-lang/rust/pull/25522
8620 [bh]: https://github.com/rust-lang/rust/pull/25856
8621 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8622 [ll]: https://github.com/rust-lang/rust/pull/26022
8623 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8624 [drop]: https://github.com/rust-lang/rust/pull/24935
8626 Version 1.0.0 (2015-05-15)
8627 ========================
8629 * ~1500 changes, numerous bugfixes
8634 * The vast majority of the standard library is now `#[stable]`. It is
8635 no longer possible to use unstable features with a stable build of
8637 * Many popular crates on [crates.io] now work on the stable release
8639 * Arithmetic on basic integer types now [checks for overflow in debug
8645 * Several [restrictions have been added to trait coherence][coh] in
8646 order to make it easier for upstream authors to change traits
8647 without breaking downstream code.
8648 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8649 improve error messages and macro behavior. For example, `0b1234` is
8650 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8651 * Trait bounds [are always invariant][inv], eliminating the need for
8652 the `PhantomFn` and `MarkerTrait` lang items, which have been
8654 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8655 "foo" as bar` syntax has been replaced with `extern crate foo as
8656 bar`, and Cargo now automatically translates "-" in *package* names
8657 to underscore for the crate name.
8658 * [Lifetime shadowing is an error][lt].
8659 * [`Send` no longer implies `'static`][send-rfc].
8660 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8661 `MyType::default()`.
8662 * Primitive types [now have inherent methods][prim-inherent],
8663 obviating the need for extension traits like `SliceExt`.
8664 * Methods with `Self: Sized` in their `where` clause are [considered
8665 object-safe][self-sized], allowing many extension traits like
8666 `IteratorExt` to be merged into the traits they extended.
8667 * You can now [refer to associated types][assoc-where] whose
8668 corresponding trait bounds appear only in a `where` clause.
8669 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8670 like `Send` and `Sync` are now library-defined.
8671 * A [Reflect trait][reflect] was introduced, which means that
8672 downcasting via the `Any` trait is effectively limited to concrete
8673 types. This helps retain the potentially-important "parametricity"
8674 property: generic code cannot behave differently for different type
8675 arguments except in minor ways.
8676 * The `unsafe_destructor` feature is now deprecated in favor of the
8677 [new `dropck`][dropck]. This change is a major reduction in unsafe
8683 * The `thread_local` module [has been renamed to `std::thread`][th].
8684 * The methods of `IteratorExt` [have been moved to the `Iterator`
8686 * Several traits that implement Rust's conventions for type
8687 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8688 [centralized in the `std::convert` module][con].
8689 * The `FromError` trait [was removed in favor of `From`][fe].
8690 * The basic sleep function [has moved to
8691 `std::thread::sleep_ms`][slp].
8692 * The `splitn` function now takes an `n` parameter that represents the
8693 number of items yielded by the returned iterator [instead of the
8694 number of 'splits'][spl].
8695 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8696 * [Derived implementations of `PartialOrd` now order enums according
8697 to their explicitly-assigned discriminants][po].
8698 * [Methods for searching strings are generic over `Pattern`s][pat],
8699 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8701 * [In method resolution, object methods are resolved before inherent
8703 * [`String::from_str` has been deprecated in favor of the `From` impl,
8704 `String::from`][sf].
8705 * [`io::Error` implements `Sync`][ios].
8706 * [The `words` method on `&str` has been replaced with
8707 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8709 * The new path and IO modules are complete and `#[stable]`. This
8710 was the major library focus for this cycle.
8711 * The path API was [revised][path-normalize] to normalize `.`,
8712 adjusting the tradeoffs in favor of the most common usage.
8713 * A large number of remaining APIs in `std` were also stabilized
8714 during this cycle; about 75% of the non-deprecated API surface
8716 * The new [string pattern API][string-pattern] landed, which makes
8717 the string slice API much more internally consistent and flexible.
8718 * A new set of [generic conversion traits][conversion] replaced
8719 many existing ad hoc traits.
8720 * Generic numeric traits were [completely removed][num-traits]. This
8721 was made possible thanks to inherent methods for primitive types,
8722 and the removal gives maximal flexibility for designing a numeric
8723 hierarchy in the future.
8724 * The `Fn` traits are now related via [inheritance][fn-inherit]
8725 and provide ergonomic [blanket implementations][fn-blanket].
8726 * The `Index` and `IndexMut` traits were changed to
8727 [take the index by value][index-value], enabling code like
8728 `hash_map["string"]` to work.
8729 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8730 `Copy` data is known to be `Clone` as well.
8735 * Many errors now have extended explanations that can be accessed with
8736 the `--explain` flag to `rustc`.
8737 * Many new examples have been added to the standard library
8739 * rustdoc has received a number of improvements focused on completion
8741 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8742 * Much headway was made on ecosystem-wide CI, making it possible
8743 to [compare builds for breakage][ci-compare].
8746 [crates.io]: http://crates.io
8747 [clo]: https://github.com/rust-lang/rust/pull/24034
8748 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8749 [con]: https://github.com/rust-lang/rust/pull/23875
8750 [cr]: https://github.com/rust-lang/rust/pull/23419
8751 [fe]: https://github.com/rust-lang/rust/pull/23879
8752 [ie]: https://github.com/rust-lang/rust/pull/23300
8753 [inv]: https://github.com/rust-lang/rust/pull/23938
8754 [ios]: https://github.com/rust-lang/rust/pull/24133
8755 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8756 [lt]: https://github.com/rust-lang/rust/pull/24057
8757 [meth]: https://github.com/rust-lang/rust/pull/24056
8758 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8759 [po]: https://github.com/rust-lang/rust/pull/24270
8760 [sf]: https://github.com/rust-lang/rust/pull/24517
8761 [slp]: https://github.com/rust-lang/rust/pull/23949
8762 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8763 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8764 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8765 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8766 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8767 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8768 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8769 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8770 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8771 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8772 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8773 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8774 [reflect]: https://github.com/rust-lang/rust/pull/23712
8775 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8776 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8777 [index-value]: https://github.com/rust-lang/rust/pull/23601
8778 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8779 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8780 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8781 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8782 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8783 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8786 Version 1.0.0-alpha.2 (2015-02-20)
8787 =====================================
8789 * ~1300 changes, numerous bugfixes
8793 * The various I/O modules were [overhauled][io-rfc] to reduce
8794 unnecessary abstractions and provide better interoperation with
8795 the underlying platform. The old `io` module remains temporarily
8797 * The standard library now [participates in feature gating][feat],
8798 so use of unstable libraries now requires a `#![feature(...)]`
8799 attribute. The impact of this change is [described on the
8800 forum][feat-forum]. [RFC][feat-rfc].
8804 * `for` loops [now operate on the `IntoIterator` trait][into],
8805 which eliminates the need to call `.iter()`, etc. to iterate
8806 over collections. There are some new subtleties to remember
8807 though regarding what sort of iterators various types yield, in
8808 particular that `for foo in bar { }` yields values from a move
8809 iterator, destroying the original collection. [RFC][into-rfc].
8810 * Objects now have [default lifetime bounds][obj], so you don't
8811 have to write `Box<Trait+'static>` when you don't care about
8812 storing references. [RFC][obj-rfc].
8813 * In types that implement `Drop`, [lifetimes must outlive the
8814 value][drop]. This will soon make it possible to safely
8815 implement `Drop` for types where `#[unsafe_destructor]` is now
8816 required. Read the [gorgeous RFC][drop-rfc] for details.
8817 * The fully qualified <T as Trait>::X syntax lets you set the Self
8818 type for a trait method or associated type. [RFC][ufcs-rfc].
8819 * References to types that implement `Deref<U>` now [automatically
8820 coerce to references][deref] to the dereferenced type `U`,
8821 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8822 should eliminate many unsightly uses of `&*`, as when converting
8823 from references to vectors into references to
8824 slices. [RFC][deref-rfc].
8825 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8826 `|:|`) is obsolete and closure kind is inferred from context.
8827 * [`Self` is a keyword][Self].
8831 * The `Show` and `String` formatting traits [have been
8832 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8833 their related purposes. Automatically getting a string
8834 conversion to use with `format!("{:?}", something_to_debug)` is
8835 now written `#[derive(Debug)]`.
8836 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8837 OsStr}`, provide strings in platform-specific encodings for easier
8838 interop with system APIs. [RFC][osstr-rfc].
8839 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8840 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8841 creating raw pointers.
8845 * Certain long error messages of the form 'expected foo found bar'
8846 are now [split neatly across multiple
8847 lines][multiline]. Examples in the PR.
8848 * On Unix Rust can be [uninstalled][un] by running
8849 `/usr/local/lib/rustlib/uninstall.sh`.
8850 * The `#[rustc_on_unimplemented]` attribute, requiring the
8851 'on_unimplemented' feature, lets rustc [display custom error
8852 messages when a trait is expected to be implemented for a type
8857 * Rust is tested against a [LALR grammar][lalr], which parses
8858 almost all the Rust files that rustc does.
8860 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8861 [close]: https://github.com/rust-lang/rust/pull/21843
8862 [deref]: https://github.com/rust-lang/rust/pull/21351
8863 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8864 [drop]: https://github.com/rust-lang/rust/pull/21972
8865 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8866 [feat]: https://github.com/rust-lang/rust/pull/21248
8867 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8868 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8869 [fmt]: https://github.com/rust-lang/rust/pull/21457
8870 [into]: https://github.com/rust-lang/rust/pull/20790
8871 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8872 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8873 [lalr]: https://github.com/rust-lang/rust/pull/21452
8874 [multiline]: https://github.com/rust-lang/rust/pull/19870
8875 [obj]: https://github.com/rust-lang/rust/pull/22230
8876 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8877 [onun]: https://github.com/rust-lang/rust/pull/20889
8878 [osstr]: https://github.com/rust-lang/rust/pull/21488
8879 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8880 [Self]: https://github.com/rust-lang/rust/pull/22158
8881 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8882 [un]: https://github.com/rust-lang/rust/pull/22256
8885 Version 1.0.0-alpha (2015-01-09)
8886 ==================================
8888 * ~2400 changes, numerous bugfixes
8892 * The language itself is considered feature complete for 1.0,
8893 though there will be many usability improvements and bugfixes
8894 before the final release.
8895 * Nearly 50% of the public API surface of the standard library has
8896 been declared 'stable'. Those interfaces are unlikely to change
8898 * The long-running debate over integer types has been
8899 [settled][ints]: Rust will ship with types named `isize` and
8900 `usize`, rather than `int` and `uint`, for pointer-sized
8901 integers. Guidelines will be rolled out during the alpha cycle.
8902 * Most crates that are not `std` have been moved out of the Rust
8903 distribution into the Cargo ecosystem so they can evolve
8904 separately and don't need to be stabilized as quickly, including
8905 'time', 'getopts', 'num', 'regex', and 'term'.
8906 * Documentation continues to be expanded with more API coverage, more
8907 examples, and more in-depth explanations. The guides have been
8908 consolidated into [The Rust Programming Language][trpl].
8909 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8910 * All official Rust binary installers now come with [Cargo], the
8911 Rust package manager.
8915 * Closures have been [completely redesigned][unboxed] to be
8916 implemented in terms of traits, can now be used as generic type
8917 bounds and thus monomorphized and inlined, or via an opaque
8918 pointer (boxed) as in the old system. The new system is often
8919 referred to as 'unboxed' closures.
8920 * Traits now support [associated types][assoc], allowing families
8921 of related types to be defined together and used generically in
8923 * Enum variants are [namespaced by their type names][enum].
8924 * [`where` clauses][where] provide a more versatile and attractive
8925 syntax for specifying generic bounds, though the previous syntax
8927 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8929 * Rust [no longer has a runtime][rt] of any description, and only
8930 supports OS threads, not green threads.
8931 * At long last, Rust has been overhauled for 'dynamically-sized
8932 types' ([DST]), which integrates 'fat pointers' (object types,
8933 arrays, and `str`) more deeply into the type system, making it
8935 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8936 `..j` that produce range types and which, when combined with the
8937 `Index` operator and multidispatch, leads to a convenient slice
8939 * The new range syntax revealed an ambiguity in the fixed-length
8940 array syntax, so now fixed length arrays [are written `[T;
8942 * The `Copy` trait is no longer implemented automatically. Unsafe
8943 pointers no longer implement `Sync` and `Send` so types
8944 containing them don't automatically either. `Sync` and `Send`
8945 are now 'unsafe traits' so one can "forcibly" implement them via
8946 `unsafe impl` if a type confirms to the requirements for them
8947 even though the internals do not (e.g. structs containing unsafe
8948 pointers like `Arc`). These changes are intended to prevent some
8949 footguns and are collectively known as [opt-in built-in
8950 traits][oibit] (though `Sync` and `Send` will soon become pure
8951 library types unknown to the compiler).
8952 * Operator traits now take their operands [by value][ops], and
8953 comparison traits can use multidispatch to compare one type
8954 against multiple other types, allowing e.g. `String` to be
8955 compared with `&str`.
8956 * `if let` and `while let` are no longer feature-gated.
8957 * Rust has adopted a more [uniform syntax for escaping unicode
8958 characters][unicode].
8959 * `macro_rules!` [has been declared stable][mac]. Though it is a
8960 flawed system it is sufficiently popular that it must be usable
8961 for 1.0. Effort has gone into [future-proofing][mac-future] it
8962 in ways that will allow other macro systems to be developed in
8963 parallel, and won't otherwise impact the evolution of the
8965 * The prelude has been [pared back significantly][prelude] such
8966 that it is the minimum necessary to support the most pervasive
8967 code patterns, and through [generalized where clauses][where]
8968 many of the prelude extension traits have been consolidated.
8969 * Rust's rudimentary reflection [has been removed][refl], as it
8970 incurred too much code generation for little benefit.
8971 * [Struct variants][structvars] are no longer feature-gated.
8972 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8973 known as 'higher-ranked trait bounds', this crucially allows
8974 unboxed closures to work.
8975 * Macros invocations surrounded by parens or square brackets and
8976 not terminated by a semicolon are [parsed as
8977 expressions][macros], which makes expressions like `vec![1i32,
8978 2, 3].len()` work as expected.
8979 * Trait objects now implement their traits automatically, and
8980 traits that can be coerced to objects now must be [object
8982 * Automatically deriving traits is now done with `#[derive(...)]`
8983 not `#[deriving(...)]` for [consistency with other naming
8984 conventions][derive].
8985 * Importing the containing module or enum at the same time as
8986 items or variants they contain is [now done with `self` instead
8987 of `mod`][self], as in use `foo::{self, bar}`
8988 * Glob imports are no longer feature-gated.
8989 * The `box` operator and `box` patterns have been feature-gated
8990 pending a redesign. For now unique boxes should be allocated
8991 like other containers, with `Box::new`.
8995 * A [series][coll1] of [efforts][coll2] to establish
8996 [conventions][coll3] for collections types has resulted in API
8997 improvements throughout the standard library.
8998 * New [APIs for error handling][err] provide ergonomic interop
8999 between error types, and [new conventions][err-conv] describe
9000 more clearly the recommended error handling strategies in Rust.
9001 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9002 it is easier to discuss failure in the context of error handling
9003 without making clarifications as to whether you are referring to
9004 the 'fail' macro or failure more generally.
9005 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9006 syscall when available.
9007 * The 'serialize' crate has been renamed 'rustc-serialize' and
9008 moved out of the distribution to Cargo. Although it is widely
9009 used now, it is expected to be superseded in the near future.
9010 * The `Show` formatter, typically implemented with
9011 `#[derive(Show)]` is [now requested with the `{:?}`
9012 specifier][show] and is intended for use by all types, for uses
9013 such as `println!` debugging. The new `String` formatter must be
9014 implemented by hand, uses the `{}` specifier, and is intended
9015 for full-fidelity conversions of things that can logically be
9016 represented as strings.
9020 * [Flexible target specification][flex] allows rustc's code
9021 generation to be configured to support otherwise-unsupported
9023 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9024 respective debuggers with Rust-appropriate pretty-printing.
9025 * The Windows installation of Rust is distributed with the
9026 MinGW components currently required to link binaries on that
9031 * Nullable enum optimizations have been extended to more types so
9032 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9033 space than the inner types themselves.
9034 * Work has begun on supporting AArch64.
9036 [Cargo]: https://crates.io
9037 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9038 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9039 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9040 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9041 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9042 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9043 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9044 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9045 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9046 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9047 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9048 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9049 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9050 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9051 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9052 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9053 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9054 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9055 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9056 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9057 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9058 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9059 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9060 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9061 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9062 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9063 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9064 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9065 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9066 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9067 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9068 [trpl]: https://doc.rust-lang.org/book/index.html
9069 [rbe]: http://rustbyexample.com/
9072 Version 0.12.0 (2014-10-09)
9073 =============================
9075 * ~1900 changes, numerous bugfixes
9079 * The introductory documentation (now called The Rust Guide) has
9080 been completely rewritten, as have a number of supplementary
9082 * Rust's package manager, Cargo, continues to improve and is
9083 sometimes considered to be quite awesome.
9084 * Many API's in `std` have been reviewed and updated for
9085 consistency with the in-development Rust coding
9086 guidelines. The standard library documentation tracks
9087 stabilization progress.
9088 * Minor libraries have been moved out-of-tree to the rust-lang org
9089 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9090 be installed with Cargo.
9091 * Lifetime elision allows lifetime annotations to be left off of
9092 function declarations in many common scenarios.
9093 * Rust now works on 64-bit Windows.
9096 * Indexing can be overloaded with the `Index` and `IndexMut`
9098 * The `if let` construct takes a branch only if the `let` pattern
9099 matches, currently behind the 'if_let' feature gate.
9100 * 'where clauses', a more flexible syntax for specifying trait
9101 bounds that is more aesthetic, have been added for traits and
9102 free functions. Where clauses will in the future make it
9103 possible to constrain associated types, which would be
9104 impossible with the existing syntax.
9105 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9106 the 'slicing_syntax' feature gate, and can be overloaded with
9107 the `Slice` or `SliceMut` traits.
9108 * The syntax for matching of sub-slices has been changed to use a
9109 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9110 consistency with other uses of `..` and to future-proof
9111 potential additional uses of the syntax.
9112 * The syntax for matching inclusive ranges in patterns has changed
9113 from `0..3` to `0...4` to be consistent with the exclusive range
9115 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9116 c]`) has been put behind the 'advanced_slice_patterns' feature
9117 gate and may be removed in the future.
9118 * Components of tuples and tuple structs can be extracted using
9119 the `value.0` syntax, currently behind the `tuple_indexing`
9121 * The `#[crate_id]` attribute is no longer supported; versioning
9122 is handled by the package manager.
9123 * Renaming crate imports are now written `extern crate foo as bar`
9124 instead of `extern crate bar = foo`.
9125 * Renaming use statements are now written `use foo as bar` instead
9127 * `let` and `match` bindings and argument names in macros are now
9129 * The new, more efficient, closure types ('unboxed closures') have
9130 been added under a feature gate, 'unboxed_closures'. These will
9131 soon replace the existing closure types, once higher-ranked
9132 trait lifetimes are added to the language.
9133 * `move` has been added as a keyword, for indicating closures
9134 that capture by value.
9135 * Mutation and assignment is no longer allowed in pattern guards.
9136 * Generic structs and enums can now have trait bounds.
9137 * The `Share` trait is now called `Sync` to free up the term
9138 'shared' to refer to 'shared reference' (the default reference
9140 * Dynamically-sized types have been mostly implemented,
9141 unifying the behavior of fat-pointer types with the rest of the
9143 * As part of dynamically-sized types, the `Sized` trait has been
9144 introduced, which qualifying types implement by default, and
9145 which type parameters expect by default. To specify that a type
9146 parameter does not need to be sized, write `<Sized? T>`. Most
9147 types are `Sized`, notable exceptions being unsized arrays
9148 (`[T]`) and trait types.
9149 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9150 * Lifetime bounds can now be applied to type parameters and object
9152 * The old, reference counted GC type, `Gc<T>` which was once
9153 denoted by the `@` sigil, has finally been removed. GC will be
9154 revisited in the future.
9157 * Library documentation has been improved for a number of modules.
9158 * Bit-vectors, collections::bitv has been modernized.
9159 * The url crate is deprecated in favor of
9160 http://github.com/servo/rust-url, which can be installed with
9162 * Most I/O stream types can be cloned and subsequently closed from
9164 * A `std::time::Duration` type has been added for use in I/O
9165 methods that rely on timers, as well as in the 'time' crate's
9166 `Timespec` arithmetic.
9167 * The runtime I/O abstraction layer that enabled the green thread
9168 scheduler to do non-thread-blocking I/O has been removed, along
9169 with the libuv-based implementation employed by the green thread
9170 scheduler. This will greatly simplify the future I/O work.
9171 * `collections::btree` has been rewritten to have a more
9172 idiomatic and efficient design.
9175 * rustdoc output now indicates the stability levels of API's.
9176 * The `--crate-name` flag can specify the name of the crate
9177 being compiled, like `#[crate_name]`.
9178 * The `-C metadata` specifies additional metadata to hash into
9179 symbol names, and `-C extra-filename` specifies additional
9180 information to put into the output filename, for use by the
9181 package manager for versioning.
9182 * debug info generation has continued to improve and should be
9183 more reliable under both gdb and lldb.
9184 * rustc has experimental support for compiling in parallel
9185 using the `-C codegen-units` flag.
9186 * rustc no longer encodes rpath information into binaries by
9190 * Stack usage has been optimized with LLVM lifetime annotations.
9191 * Official Rust binaries on Linux are more compatible with older
9192 kernels and distributions, built on CentOS 5.10.
9195 Version 0.11.0 (2014-07-02)
9196 ==========================
9198 * ~1700 changes, numerous bugfixes
9201 * ~[T] has been removed from the language. This type is superseded by
9203 * ~str has been removed from the language. This type is superseded by
9205 * ~T has been removed from the language. This type is superseded by the
9207 * @T has been removed from the language. This type is superseded by the
9208 standard library's std::gc::Gc<T> type.
9209 * Struct fields are now all private by default.
9210 * Vector indices and shift amounts are both required to be a `uint`
9211 instead of any integral type.
9212 * Byte character, byte string, and raw byte string literals are now all
9213 supported by prefixing the normal literal with a `b`.
9214 * Multiple ABIs are no longer allowed in an ABI string
9215 * The syntax for lifetimes on closures/procedures has been tweaked
9216 slightly: `<'a>|A, B|: 'b + K -> T`
9217 * Floating point modulus has been removed from the language; however it
9218 is still provided by a library implementation.
9219 * Private enum variants are now disallowed.
9220 * The `priv` keyword has been removed from the language.
9221 * A closure can no longer be invoked through a &-pointer.
9222 * The `use foo, bar, baz;` syntax has been removed from the language.
9223 * The transmute intrinsic no longer works on type parameters.
9224 * Statics now allow blocks/items in their definition.
9225 * Trait bounds are separated from objects with + instead of : now.
9226 * Objects can no longer be read while they are mutably borrowed.
9227 * The address of a static is now marked as insignificant unless the
9228 #[inline(never)] attribute is placed it.
9229 * The #[unsafe_destructor] attribute is now behind a feature gate.
9230 * Struct literals are no longer allowed in ambiguous positions such as
9231 if, while, match, and for..in.
9232 * Declaration of lang items and intrinsics are now feature-gated by
9234 * Integral literals no longer default to `int`, and floating point
9235 literals no longer default to `f64`. Literals must be suffixed with an
9236 appropriate type if inference cannot determine the type of the
9238 * The Box<T> type is no longer implicitly borrowed to &mut T.
9239 * Procedures are now required to not capture borrowed references.
9242 * The standard library is now a "facade" over a number of underlying
9243 libraries. This means that development on the standard library should
9244 be speedier due to smaller crates, as well as a clearer line between
9246 * A new library, libcore, lives under the standard library's facade
9247 which is Rust's "0-assumption" library, suitable for embedded and
9248 kernel development for example.
9249 * A regex crate has been added to the standard distribution. This crate
9250 includes statically compiled regular expressions.
9251 * The unwrap/unwrap_err methods on Result require a Show bound for
9252 better error messages.
9253 * The return types of the std::comm primitives have been centralized
9254 around the Result type.
9255 * A number of I/O primitives have gained the ability to time out their
9257 * A number of I/O primitives have gained the ability to close their
9258 reading/writing halves to cancel pending operations.
9259 * Reverse iterator methods have been removed in favor of `rev()` on
9260 their forward-iteration counterparts.
9261 * A bitflags! macro has been added to enable easy interop with C and
9262 management of bit flags.
9263 * A debug_assert! macro is now provided which is disabled when
9264 `--cfg ndebug` is passed to the compiler.
9265 * A graphviz crate has been added for creating .dot files.
9266 * The std::cast module has been migrated into std::mem.
9267 * The std::local_data api has been migrated from freestanding functions
9268 to being based on methods.
9269 * The Pod trait has been renamed to Copy.
9270 * jemalloc has been added as the default allocator for types.
9271 * The API for allocating memory has been changed to use proper alignment
9272 and sized deallocation
9273 * Connecting a TcpStream or binding a TcpListener is now based on a
9274 string address and a u16 port. This allows connecting to a hostname as
9276 * The Reader trait now contains a core method, read_at_least(), which
9277 correctly handles many repeated 0-length reads.
9278 * The process-spawning API is now centered around a builder-style
9280 * The :? printing qualifier has been moved from the standard library to
9281 an external libdebug crate.
9282 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9283 have been renamed to Eq/Ord.
9284 * The select/plural methods have been removed from format!. The escapes
9285 for { and } have also changed from \{ and \} to {{ and }},
9287 * The TaskBuilder API has been re-worked to be a true builder, and
9288 extension traits for spawning native/green tasks have been added.
9291 * All breaking changes to the language or libraries now have their
9292 commit message annotated with `[breaking-change]` to allow for easy
9293 discovery of breaking changes.
9294 * The compiler will now try to suggest how to annotate lifetimes if a
9295 lifetime-related error occurs.
9296 * Debug info continues to be improved greatly with general bug fixes and
9297 better support for situations like link time optimization (LTO).
9298 * Usage of syntax extensions when cross-compiling has been fixed.
9299 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9300 -fdata-sections and --gc-sections has been enabled by default
9301 * The compiler is now stricter about where it will load module files
9302 from when a module is declared via `mod foo;`.
9303 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9304 Syntax extensions are now discovered via a "plugin registrar" type
9305 which will be extended in the future to other various plugins.
9306 * Lints have been restructured to allow for dynamically loadable lints.
9307 * A number of rustdoc improvements:
9308 * The HTML output has been visually redesigned.
9309 * Markdown is now powered by hoedown instead of sundown.
9310 * Searching heuristics have been greatly improved.
9311 * The search index has been reduced in size by a great amount.
9312 * Cross-crate documentation via `pub use` has been greatly improved.
9313 * Primitive types are now hyperlinked and documented.
9314 * Documentation has been moved from static.rust-lang.org/doc to
9316 * A new sandbox, play.rust-lang.org, is available for running and
9317 sharing rust code examples on-line.
9318 * Unused attributes are now more robustly warned about.
9319 * The dead_code lint now warns about unused struct fields.
9320 * Cross-compiling to iOS is now supported.
9321 * Cross-compiling to mipsel is now supported.
9322 * Stability attributes are now inherited by default and no longer apply
9323 to intra-crate usage, only inter-crate usage.
9324 * Error message related to non-exhaustive match expressions have been
9328 Version 0.10 (2014-04-03)
9329 =========================
9331 * ~1500 changes, numerous bugfixes
9334 * A new RFC process is now in place for modifying the language.
9335 * Patterns with `@`-pointers have been removed from the language.
9336 * Patterns with unique vectors (`~[T]`) have been removed from the
9338 * Patterns with unique strings (`~str`) have been removed from the
9340 * `@str` has been removed from the language.
9341 * `@[T]` has been removed from the language.
9342 * `@self` has been removed from the language.
9343 * `@Trait` has been removed from the language.
9344 * Headers on `~` allocations which contain `@` boxes inside the type for
9345 reference counting have been removed.
9346 * The semantics around the lifetimes of temporary expressions have changed,
9347 see #3511 and #11585 for more information.
9348 * Cross-crate syntax extensions are now possible, but feature gated. See
9349 #11151 for more information. This includes both `macro_rules!` macros as
9350 well as syntax extensions such as `format!`.
9351 * New lint modes have been added, and older ones have been turned on to be
9353 * Unnecessary parentheses
9356 * Uppercase variables
9357 * Publicly visible private types
9358 * `#[deriving]` with raw pointers
9359 * Unsafe functions can no longer be coerced to closures.
9360 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9361 * The `#[simd]` attribute is now behind a feature gate.
9362 * Visibility is no longer allowed on `extern crate` statements, and
9363 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9364 * Trailing commas are now allowed in argument lists and tuple patterns.
9365 * The `do` keyword has been removed, it is now a reserved keyword.
9366 * Default type parameters have been implemented, but are feature gated.
9367 * Borrowed variables through captures in closures are now considered soundly.
9368 * `extern mod` is now `extern crate`
9369 * The `Freeze` trait has been removed.
9370 * The `Share` trait has been added for types that can be shared among
9372 * Labels in macros are now hygienic.
9373 * Expression/statement macro invocations can be delimited with `{}` now.
9374 * Treatment of types allowed in `static mut` locations has been tweaked.
9375 * The `*` and `.` operators are now overloadable through the `Deref` and
9377 * `~Trait` and `proc` no longer have `Send` bounds by default.
9378 * Partial type hints are now supported with the `_` type marker.
9379 * An `Unsafe` type was introduced for interior mutability. It is now
9380 considered undefined to transmute from `&T` to `&mut T` without using the
9382 * The #[linkage] attribute was implemented for extern statics/functions.
9383 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9384 * `Pod` was renamed to `Copy`.
9387 * The `libextra` library has been removed. It has now been decomposed into
9388 component libraries with smaller and more focused nuggets of
9389 functionality. The full list of libraries can be found on the
9390 documentation index page.
9391 * std: `std::condition` has been removed. All I/O errors are now propagated
9392 through the `Result` type. In order to assist with error handling, a
9393 `try!` macro for unwrapping errors with an early return and a lint for
9394 unused results has been added. See #12039 for more information.
9395 * std: The `vec` module has been renamed to `slice`.
9396 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9397 This will become the only growable vector in the future.
9398 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9399 are now found at `std::io::BufferedReader` instead of
9400 `std::io::buffered::BufferedReader`.
9401 * std: `print` and `println` are no longer in the prelude, the `print!` and
9402 `println!` macros are intended to be used instead.
9403 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9404 attempts to statically prevent cycles.
9405 * std: The standard distribution is adopting the policy of pushing failure
9406 to the user rather than failing in libraries. Many functions (such as
9407 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9408 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9409 deriving mode: `#[deriving(Show)]`.
9410 * std: `ToStr` is now implemented for all types implementing `Show`.
9411 * std: The formatting trait methods now take `&self` instead of `&T`
9412 * std: The `invert()` method on iterators has been renamed to `rev()`
9413 * std: `std::num` has seen a reduction in the genericity of its traits,
9414 consolidating functionality into a few core traits.
9415 * std: Backtraces are now printed on task failure if the environment
9416 variable `RUST_BACKTRACE` is present.
9417 * std: Naming conventions for iterators have been standardized. More details
9418 can be found on the wiki's style guide.
9419 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9420 still implement the function.
9421 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9422 * std: `assert_approx_eq!` has been removed
9423 * std: The `e` and `E` formatting specifiers for floats have been added to
9424 print them in exponential notation.
9425 * std: The `Times` trait has been removed
9426 * std: Indications of variance and opting out of builtin bounds is done
9427 through marker types in `std::kinds::marker` now
9428 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9429 `#[deriving(Hash)]` is now possible.
9430 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9431 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9432 * std: `Chan::new` is now `channel()`.
9433 * std: A new synchronous channel type has been implemented.
9434 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9435 * std: `hashmap` and `trie` have been moved to `libcollections`
9436 * std: `run` has been rolled into `io::process`
9437 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9438 * std: The equality and comparison traits have seen some reorganization.
9439 * std: `rand` has moved to `librand`.
9440 * std: `to_{lower,upper}case` has been implemented for `char`.
9441 * std: Logging has been moved to `liblog`.
9442 * collections: `HashMap` has been rewritten for higher performance and less
9444 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9445 it can be booted manually. The runtime guide has more information and
9447 * native: All I/O functionality except signals has been implemented.
9448 * green: Task spawning with `libgreen` has been optimized with stack caching
9449 and various trimming of code.
9450 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9451 * sync: The `extra::sync` module has been updated to modern rust (and moved
9452 to the `sync` library), tweaking and improving various interfaces while
9453 dropping redundant functionality.
9454 * sync: A new `Barrier` type has been added to the `sync` library.
9455 * sync: An efficient mutex for native and green tasks has been implemented.
9456 * serialize: The `base64` module has seen some improvement. It treats
9457 newlines better, has non-string error values, and has seen general
9459 * fourcc: A `fourcc!` macro was introduced
9460 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9461 hexadecimal literal.
9464 * `rustpkg` has been deprecated and removed from the main repository. Its
9465 replacement, `cargo`, is under development.
9466 * Nightly builds of rust are now available
9467 * The memory usage of rustc has been improved many times throughout this
9469 * The build process supports disabling rpath support for the rustc binary
9471 * Code generation has improved in some cases, giving more information to the
9472 LLVM optimization passes to enable more extensive optimizations.
9473 * Debuginfo compatibility with lldb on OSX has been restored.
9474 * The master branch is now gated on an android bot, making building for
9475 android much more reliable.
9476 * Output flags have been centralized into one `--emit` flag.
9477 * Crate type flags have been centralized into one `--crate-type` flag.
9478 * Codegen flags have been consolidated behind a `-C` flag.
9479 * Linking against outdated crates now has improved error messages.
9480 * Error messages with lifetimes will often suggest how to annotate the
9481 function to fix the error.
9482 * Many more types are documented in the standard library, and new guides
9484 * Many `rustdoc` improvements:
9485 * code blocks are syntax highlighted.
9486 * render standalone markdown files.
9487 * the --test flag tests all code blocks by default.
9488 * exported macros are displayed.
9489 * re-exported types have their documentation inlined at the location of the
9491 * search works across crates that have been rendered to the same output
9495 Version 0.9 (2014-01-09)
9496 ==========================
9498 * ~1800 changes, numerous bugfixes
9501 * The `float` type has been removed. Use `f32` or `f64` instead.
9502 * A new facility for enabling experimental features (feature gating) has
9503 been added, using the crate-level `#[feature(foo)]` attribute.
9504 * Managed boxes (@) are now behind a feature gate
9505 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9506 standard library's `Gc` or `Rc` types instead.
9507 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9508 * Jumping back to the top of a loop is now done with `continue` instead of
9510 * Strings can no longer be mutated through index assignment.
9511 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9512 hash delimiters, as in `r###"foo"###`.
9513 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9515 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9516 * `@fn`s have been removed.
9517 * `do` only works with procs in order to make it obvious what the cost
9519 * Single-element tuple-like structs can no longer be dereferenced to
9520 obtain the inner value. A more comprehensive solution for overloading
9521 the dereference operator will be provided in the future.
9522 * The `#[link(...)]` attribute has been replaced with
9523 `#[crate_id = "name#vers"]`.
9524 * Empty `impl`s must be terminated with empty braces and may not be
9525 terminated with a semicolon.
9526 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9527 no longer has any special meaning.
9528 * The old `fmt!` string formatting macro has been removed.
9529 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9530 `print!` and `println!`.
9531 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9532 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9533 `extern mod foo = "bar"` instead.
9534 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9535 * Macros can have attributes.
9536 * Macros can expand to items with attributes.
9537 * Macros can expand to multiple items.
9538 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9539 * Comments may be nested.
9540 * Values automatically coerce to trait objects they implement, without
9542 * Enum discriminants are no longer an entire word but as small as needed to
9543 contain all the variants. The `repr` attribute can be used to override
9544 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9545 `#[repr(C)]` to match C enums.
9546 * Non-string literals are not allowed in attributes (they never worked).
9547 * The FFI now supports variadic functions.
9548 * Octal numeric literals, as in `0o7777`.
9549 * The `concat!` syntax extension performs compile-time string concatenation.
9550 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9551 removed as Rust no longer uses segmented stacks.
9552 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9553 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9554 not `*`; ignoring remaining fields of a struct is also done with `..`,
9555 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9556 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9557 * `rustc` supports the "system" calling convention, which defaults to the
9558 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9560 * The `type_overflow` lint (default: warn) checks literals for overflow.
9561 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9562 * The `attribute_usage` lint (default: warn) warns about unknown
9564 * The `unknown_features` lint (default: warn) warns about unknown
9566 * The `dead_code` lint (default: warn) checks for dead code.
9567 * Rust libraries can be linked statically to one another
9568 * `#[link_args]` is behind the `link_args` feature gate.
9569 * Native libraries are now linked with `#[link(name = "foo")]`
9570 * Native libraries can be statically linked to a rust crate
9571 (`#[link(name = "foo", kind = "static")]`).
9572 * Native OS X frameworks are now officially supported
9573 (`#[link(name = "foo", kind = "framework")]`).
9574 * The `#[thread_local]` attribute creates thread-local (not task-local)
9575 variables. Currently behind the `thread_local` feature gate.
9576 * The `return` keyword may be used in closures.
9577 * Types that can be copied via a memcpy implement the `Pod` kind.
9578 * The `cfg` attribute can now be used on struct fields and enum variants.
9581 * std: The `option` and `result` API's have been overhauled to make them
9582 simpler, more consistent, and more composable.
9583 * std: The entire `std::io` module has been replaced with one that is
9584 more comprehensive and that properly interfaces with the underlying
9585 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9587 * std: `io::util` contains a number of useful implementations of
9588 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9589 `ZeroReader`, `TeeReader`.
9590 * std: The reference counted pointer type `extra::rc` moved into std.
9591 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9592 just a wrapper around it).
9593 * std: The `Either` type has been removed.
9594 * std: `fmt::Default` can be implemented for any type to provide default
9595 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9596 * std: The `rand` API continues to be tweaked.
9597 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9598 on failure in gdb, is now named `rust_fail`.
9599 * std: The `each_key` and `each_value` methods on `HashMap` have been
9600 replaced by the `keys` and `values` iterators.
9601 * std: Functions dealing with type size and alignment have moved from the
9602 `sys` module to the `mem` module.
9603 * std: The `path` module was written and API changed.
9604 * std: `str::from_utf8` has been changed to cast instead of allocate.
9605 * std: `starts_with` and `ends_with` methods added to vectors via the
9606 `ImmutableEqVector` trait, which is in the prelude.
9607 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9608 if the index is out of bounds.
9609 * std: Task failure no longer propagates between tasks, as the model was
9610 complex, expensive, and incompatible with thread-based tasks.
9611 * std: The `Any` type can be used for dynamic typing.
9612 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9614 * std: Methods that produce iterators generally do not have an `_iter`
9616 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9617 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9618 * std: `util::ignore` renamed to `prelude::drop`.
9619 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9621 * std: `vec::raw` has seen a lot of cleanup and API changes.
9622 * std: The standard library no longer includes any C++ code, and very
9623 minimal C, eliminating the dependency on libstdc++.
9624 * std: Runtime scheduling and I/O functionality has been factored out into
9625 extensible interfaces and is now implemented by two different crates:
9626 libnative, for native threading and I/O; and libgreen, for green threading
9627 and I/O. This paves the way for using the standard library in more limited
9628 embedded environments.
9629 * std: The `comm` module has been rewritten to be much faster, have a
9630 simpler, more consistent API, and to work for both native and green
9632 * std: All libuv dependencies have been moved into the rustuv crate.
9633 * native: New implementations of runtime scheduling on top of OS threads.
9634 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9636 * green: The green thread scheduler and message passing types are almost
9638 * extra: The `flatpipes` module had bitrotted and was removed.
9639 * extra: All crypto functions have been removed and Rust now has a policy of
9640 not reimplementing crypto in the standard library. In the future crypto
9641 will be provided by external crates with bindings to established libraries.
9642 * extra: `c_vec` has been modernized.
9643 * extra: The `sort` module has been removed. Use the `sort` method on
9647 * The `rust` and `rusti` commands have been removed, due to lack of
9649 * `rustdoc` was completely rewritten.
9650 * `rustdoc` can test code examples in documentation.
9651 * `rustpkg` can test packages with the argument, 'test'.
9652 * `rustpkg` supports arbitrary dependencies, including C libraries.
9653 * `rustc`'s support for generating debug info is improved again.
9654 * `rustc` has better error reporting for unbalanced delimiters.
9655 * `rustc`'s JIT support was removed due to bitrot.
9656 * Executables and static libraries can be built with LTO (-Z lto)
9657 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9661 Version 0.8 (2013-09-26)
9662 ============================
9664 * ~2200 changes, numerous bugfixes
9667 * The `for` loop syntax has changed to work with the `Iterator` trait.
9668 * At long last, unwinding works on Windows.
9669 * Default methods are ready for use.
9670 * Many trait inheritance bugs fixed.
9671 * Owned and borrowed trait objects work more reliably.
9672 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9673 * rustc can omit emission of code for the `debug!` macro if it is passed
9675 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9676 for foo.rs, then foo/mod.rs, and will generate an error when both are
9678 * Strings no longer contain trailing nulls. The new `std::c_str` module
9679 provides new mechanisms for converting to C strings.
9680 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9681 * The FFI has been overhauled such that foreign functions are called directly,
9682 instead of through a stack-switching wrapper.
9683 * Calling a foreign function must be done through a Rust function with the
9684 `#[fixed_stack_segment]` attribute.
9685 * The `externfn!` macro can be used to declare both a foreign function and
9686 a `#[fixed_stack_segment]` wrapper at once.
9687 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9688 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9689 * `priv` is disallowed everywhere except for struct fields and enum variants.
9690 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9691 * `ref` bindings in irrefutable patterns work correctly now.
9692 * `char` is now prevented from containing invalid code points.
9693 * Casting to `bool` is no longer allowed.
9694 * `\0` is now accepted as an escape in chars and strings.
9695 * `yield` is a reserved keyword.
9696 * `typeof` is a reserved keyword.
9697 * Crates may be imported by URL with `extern mod foo = "url";`.
9698 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9699 * Static vectors can be initialized with repeating elements,
9700 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9701 * Static structs can be initialized with functional record update,
9702 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9703 * `cfg!` can be used to conditionally execute code based on the crate
9704 configuration, similarly to `#[cfg(...)]`.
9705 * The `unnecessary_qualification` lint detects unneeded module
9706 prefixes (default: allow).
9707 * Arithmetic operations have been implemented on the SIMD types in
9708 `std::unstable::simd`.
9709 * Exchange allocation headers were removed, reducing memory usage.
9710 * `format!` implements a completely new, extensible, and higher-performance
9711 string formatting system. It will replace `fmt!`.
9712 * `print!` and `println!` write formatted strings (using the `format!`
9713 extension) to stdout.
9714 * `write!` and `writeln!` write formatted strings (using the `format!`
9715 extension) to the new Writers in `std::rt::io`.
9716 * The library section in which a function or static is placed may
9717 be specified with `#[link_section = "..."]`.
9718 * The `proto!` syntax extension for defining bounded message protocols
9720 * `macro_rules!` is hygienic for `let` declarations.
9721 * The `#[export_name]` attribute specifies the name of a symbol.
9722 * `unreachable!` can be used to indicate unreachable code, and fails
9726 * std: Transitioned to the new runtime, written in Rust.
9727 * std: Added an experimental I/O library, `rt::io`, based on the new
9729 * std: A new generic `range` function was added to the prelude, replacing
9730 `uint::range` and friends.
9731 * std: `range_rev` no longer exists. Since range is an iterator it can be
9732 reversed with `range(lo, hi).invert()`.
9733 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9734 renamed to `unwrap_or`.
9735 * std: The `iterator` module was renamed to `iter`.
9736 * std: Integral types now support the `checked_add`, `checked_sub`, and
9737 `checked_mul` operations for detecting overflow.
9738 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9740 * std: Methods are standardizing on conventions for casting methods:
9741 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9743 * std: The `CString` type in `c_str` provides new ways to convert to and
9745 * std: `DoubleEndedIterator` can yield elements in two directions.
9746 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9748 * std: `str::from_bytes` renamed to `str::from_utf8`.
9749 * std: `pop_opt` and `shift_opt` methods added to vectors.
9750 * std: The task-local data interface no longer uses @, and keys are
9751 no longer function pointers.
9752 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9753 * std: Added `SharedPort` to `comm`.
9754 * std: `Eq` has a default method for `ne`; only `eq` is required
9756 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9757 is required in implementations.
9758 * std: `is_utf8` performance is improved, impacting many string functions.
9759 * std: `os::MemoryMap` provides cross-platform mmap.
9760 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9761 are not 'in-bounds' are considered undefined.
9762 * std: Many freestanding functions in `vec` removed in favor of methods.
9763 * std: Many freestanding functions on scalar types removed in favor of
9765 * std: Many options to task builders were removed since they don't make
9766 sense in the new scheduler design.
9767 * std: More containers implement `FromIterator` so can be created by the
9769 * std: More complete atomic types in `unstable::atomics`.
9770 * std: `comm::PortSet` removed.
9771 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9772 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9773 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9774 default implementations.
9775 * std: Various `from_str` functions were removed in favor of a generic
9776 `from_str` which is available in the prelude.
9777 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9778 * extra: `dlist`, the doubly-linked list was modernized.
9779 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9780 * extra: Added `glob` module, replacing `std::os::glob`.
9781 * extra: `rope` was removed.
9782 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9783 * extra: `net`, and `timer` were removed. The experimental replacements
9784 are `std::rt::io::net` and `std::rt::io::timer`.
9785 * extra: Iterators implemented for `SmallIntMap`.
9786 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9787 * extra: `SmallIntSet` removed. Use `BitvSet`.
9788 * extra: Performance of JSON parsing greatly improved.
9789 * extra: `semver` updated to SemVer 2.0.0.
9790 * extra: `term` handles more terminals correctly.
9791 * extra: `dbg` module removed.
9792 * extra: `par` module removed.
9793 * extra: `future` was cleaned up, with some method renames.
9794 * extra: Most free functions in `getopts` were converted to methods.
9797 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9798 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9799 similarly to gcc's `--march` flag.
9800 * rustc's performance compiling small crates is much better.
9801 * rustpkg has received many improvements.
9802 * rustpkg supports git tags as package IDs.
9803 * rustpkg builds into target-specific directories so it can be used for
9805 * The number of concurrent test tasks is controlled by the environment
9806 variable RUST_TEST_TASKS.
9807 * The test harness can now report metrics for benchmarks.
9808 * All tools have man pages.
9809 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9810 * The runtime uses jemalloc for allocations.
9811 * Segmented stacks are temporarily disabled as part of the transition to
9812 the new runtime. Stack overflows are possible!
9813 * A new documentation backend, rustdoc_ng, is available for use. It is
9814 still invoked through the normal `rustdoc` command.
9817 Version 0.7 (2013-07-03)
9818 =======================
9820 * ~2000 changes, numerous bugfixes
9823 * `impl`s no longer accept a visibility qualifier. Put them on methods
9825 * The borrow checker has been rewritten with flow-sensitivity, fixing
9826 many bugs and inconveniences.
9827 * The `self` parameter no longer implicitly means `&'self self`,
9828 and can be explicitly marked with a lifetime.
9829 * Overloadable compound operators (`+=`, etc.) have been temporarily
9830 removed due to bugs.
9831 * The `for` loop protocol now requires `for`-iterators to return `bool`
9832 so they compose better.
9833 * The `Durable` trait is replaced with the `'static` bounds.
9834 * Trait default methods work more often.
9835 * Structs with the `#[packed]` attribute have byte alignment and
9836 no padding between fields.
9837 * Type parameters bound by `Copy` must now be copied explicitly with
9839 * It is now illegal to move out of a dereferenced unsafe pointer.
9840 * `Option<~T>` is now represented as a nullable pointer.
9841 * `@mut` does dynamic borrow checks correctly.
9842 * The `main` function is only detected at the topmost level of the crate.
9843 The `#[main]` attribute is still valid anywhere.
9844 * Struct fields may no longer be mutable. Use inherited mutability.
9845 * The `#[no_send]` attribute makes a type that would otherwise be
9847 * The `#[no_freeze]` attribute makes a type that would otherwise be
9849 * Unbounded recursion will abort the process after reaching the limit
9850 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9851 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9852 are never implicitly copyable.
9853 * `#[static_assert]` makes compile-time assertions about static bools.
9854 * At long last, 'argument modes' no longer exist.
9855 * The rarely used `use mod` statement no longer exists.
9858 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9860 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9861 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9863 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9864 and unsuffixed integer literals.
9867 * The `core` crate was renamed to `std`.
9868 * The `std` crate was renamed to `extra`.
9869 * More and improved documentation.
9870 * std: `iterator` module for external iterator objects.
9871 * Many old-style (internal, higher-order function) iterators replaced by
9872 implementations of `Iterator`.
9873 * std: Many old internal vector and string iterators,
9874 incl. `any`, `all`. removed.
9875 * std: The `finalize` method of `Drop` renamed to `drop`.
9876 * std: The `drop` method now takes `&mut self` instead of `&self`.
9877 * std: The prelude no longer re-exports any modules, only types and traits.
9878 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9879 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9880 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9881 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9882 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9883 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9884 * std: Many types implement `Clone`.
9885 * std: `path` type renamed to `Path`.
9886 * std: `mut` module and `Mut` type removed.
9887 * std: Many standalone functions removed in favor of methods and iterators
9888 in `vec`, `str`. In the future methods will also work as functions.
9889 * std: `reinterpret_cast` removed. Use `transmute`.
9890 * std: ascii string handling in `std::ascii`.
9891 * std: `Rand` is implemented for ~/@.
9892 * std: `run` module for spawning processes overhauled.
9893 * std: Various atomic types added to `unstable::atomic`.
9894 * std: Various types implement `Zero`.
9895 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9896 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9897 * std: Added `os::mkdir_recursive`.
9898 * std: Added `os::glob` function performs filesystems globs.
9899 * std: `FuzzyEq` renamed to `ApproxEq`.
9900 * std: `Map` now defines `pop` and `swap` methods.
9901 * std: `Cell` constructors converted to static methods.
9902 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9903 * extra: `flate` module moved from `std` to `extra`.
9904 * extra: `fileinput` module for iterating over a series of files.
9905 * extra: `Complex` number type and `complex` module.
9906 * extra: `Rational` number type and `rational` module.
9907 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9908 * extra: `term` uses terminfo now, is more correct.
9909 * extra: `arc` functions converted to methods.
9910 * extra: Implementation of fixed output size variations of SHA-2.
9913 * `unused_variables` lint mode for unused variables (default: warn).
9914 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9916 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9918 * `dead_assignment` lint mode for unread variables (default: warn).
9919 * `unnecessary_allocation` lint mode detects some heap allocations that are
9920 immediately borrowed so could be written without allocating (default: warn).
9921 * `missing_doc` lint mode (default: allow).
9922 * `unreachable_code` lint mode (default: warn).
9923 * The `rusti` command has been rewritten and a number of bugs addressed.
9924 * rustc outputs in color on more terminals.
9925 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9926 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9927 * Compiling with `-g` will make the binary record information about
9928 dynamic borrowcheck failures for debugging.
9929 * rustdoc has a nicer stylesheet.
9930 * Various improvements to rustdoc.
9931 * Improvements to rustpkg (see the detailed release notes).
9934 Version 0.6 (2013-04-03)
9935 ========================
9937 * ~2100 changes, numerous bugfixes
9940 * The self type parameter in traits is now spelled `Self`
9941 * The `self` parameter in trait and impl methods must now be explicitly
9942 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9943 * Static methods no longer require the `static` keyword and instead
9944 are distinguished by the lack of a `self` parameter
9945 * Replaced the `Durable` trait with the `'static` lifetime
9946 * The old closure type syntax with the trailing sigil has been
9947 removed in favor of the more consistent leading sigil
9948 * `super` is a keyword, and may be prefixed to paths
9949 * Trait bounds are separated with `+` instead of whitespace
9950 * Traits are implemented with `impl Trait for Type`
9951 instead of `impl Type: Trait`
9952 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9953 * The `export` keyword has finally been removed
9954 * The `move` keyword has been removed (see "Semantic changes")
9955 * The interior mutability qualifier on vectors, `[mut T]`, has been
9956 removed. Use `&mut [T]`, etc.
9957 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9958 * `fail` is no longer a keyword. Use `fail!()`
9959 * `assert` is no longer a keyword. Use `assert!()`
9960 * `log` is no longer a keyword. use `debug!`, etc.
9961 * 1-tuples may be represented as `(T,)`
9962 * Struct fields may no longer be `mut`. Use inherited mutability,
9963 `@mut T`, `core::mut` or `core::cell`
9964 * `extern mod { ... }` is no longer valid syntax for foreign
9965 function modules. Use extern blocks: `extern { ... }`
9966 * Newtype enums removed. Use tuple-structs.
9967 * Trait implementations no longer support visibility modifiers
9968 * Pattern matching over vectors improved and expanded
9969 * `const` renamed to `static` to correspond to lifetime name,
9970 and make room for future `static mut` unsafe mutable globals.
9971 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9972 * `Clone` implementations can be automatically generated with
9973 `#[deriving(Clone)]`
9974 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9975 instead of `foo as Bar`.
9976 * Fixed length vector types are now written as `[int, .. 3]`
9977 instead of `[int * 3]`.
9978 * Fixed length vector types can express the length as a constant
9979 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9982 * Types with owned pointers or custom destructors move by default,
9983 eliminating the `move` keyword
9984 * All foreign functions are considered unsafe
9985 * &mut is now unaliasable
9986 * Writes to borrowed @mut pointers are prevented dynamically
9988 * The name of the main function can be customized using #[main]
9989 * The default type of an inferred closure is &fn instead of @fn
9990 * `use` statements may no longer be "chained" - they cannot import
9991 identifiers imported by previous `use` statements
9992 * `use` statements are crate relative, importing from the "top"
9993 of the crate by default. Paths may be prefixed with `super::`
9994 or `self::` to change the search behavior.
9995 * Method visibility is inherited from the implementation declaration
9996 * Structural records have been removed
9997 * Many more types can be used in static items, including enums
9998 'static-lifetime pointers and vectors
9999 * Pattern matching over vectors improved and expanded
10000 * Typechecking of closure types has been overhauled to
10001 improve inference and eliminate unsoundness
10002 * Macros leave scope at the end of modules, unless that module is
10003 tagged with #[macro_escape]
10006 * Added big integers to `std::bigint`
10007 * Removed `core::oldcomm` module
10008 * Added pipe-based `core::comm` module
10009 * Numeric traits have been reorganized under `core::num`
10010 * `vec::slice` finally returns a slice
10011 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10012 * Containers reorganized around traits in `core::container`
10013 * `core::dvec` removed, `~[T]` is a drop-in replacement
10014 * `core::send_map` renamed to `core::hashmap`
10015 * `std::map` removed; replaced with `core::hashmap`
10016 * `std::treemap` reimplemented as an owned balanced tree
10017 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10018 * `core::trie` added as a fast ordered map for integer keys
10019 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10020 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10021 overload the comparison operators, whereas `TotalOrd` is used
10022 by certain container types
10025 * Replaced the 'cargo' package manager with 'rustpkg'
10026 * Added all-purpose 'rust' tool
10027 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10028 * rustc now *attempts* to offer spelling suggestions
10029 * Improved support for ARM and Android
10030 * Preliminary MIPS backend
10031 * Improved foreign function ABI implementation for x86, x86_64
10032 * Various memory usage improvements
10033 * Rust code may be embedded in foreign code under limited circumstances
10034 * Inline assembler supported by new asm!() syntax extension.
10037 Version 0.5 (2012-12-21)
10038 ===========================
10040 * ~900 changes, numerous bugfixes
10043 * Removed `<-` move operator
10044 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10045 * Removed old fixed length vector syntax - `[T]/N`
10046 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10047 * Macros may now expand to items and statements
10048 * `a.b()` is always parsed as a method call, never as a field projection
10049 * `Eq` and `IterBytes` implementations can be automatically generated
10050 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10051 * Removed the special crate language for `.rc` files
10052 * Function arguments may consist of any irrefutable pattern
10055 * `&` and `~` pointers may point to objects
10056 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10057 * Enum variants may be structs
10058 * Destructors can be added to all nominal types with the Drop trait
10059 * Structs and nullary enum variants may be constants
10060 * Values that cannot be implicitly copied are now automatically moved
10061 without writing `move` explicitly
10062 * `&T` may now be coerced to `*T`
10063 * Coercions happen in `let` statements as well as function calls
10064 * `use` statements now take crate-relative paths
10065 * The module and type namespaces have been merged so that static
10066 method names can be resolved under the trait in which they are
10069 * Improved support for language features
10070 * Trait inheritance works in many scenarios
10071 * More support for explicit self arguments in methods - `self`, `&self`
10072 `@self`, and `~self` all generally work as expected
10073 * Static methods work in more situations
10074 * Experimental: Traits may declare default methods for the implementations
10078 * New condition handling system in `core::condition`
10079 * Timsort added to `std::sort`
10080 * New priority queue, `std::priority_queue`
10081 * Pipes for serializable types, `std::flatpipes'
10082 * Serialization overhauled to be trait-based
10083 * Expanded `getopts` definitions
10084 * Moved futures to `std`
10085 * More functions are pure now
10086 * `core::comm` renamed to `oldcomm`. Still deprecated
10087 * `rustdoc` and `cargo` are libraries now
10090 * Added a preliminary REPL, `rusti`
10091 * License changed from MIT to dual MIT/APL2
10094 Version 0.4 (2012-10-15)
10095 ==========================
10097 * ~2000 changes, numerous bugfixes
10100 * All keywords are now strict and may not be used as identifiers anywhere
10101 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10102 'of', 'with', 'to', 'class'.
10103 * Classes are replaced with simpler structs
10104 * Explicit method self types
10105 * `ret` became `return` and `alt` became `match`
10106 * `import` is now `use`; `use is now `extern mod`
10107 * `extern mod { ... }` is now `extern { ... }`
10108 * `use mod` is the recommended way to import modules
10109 * `pub` and `priv` replace deprecated export lists
10110 * The syntax of `match` pattern arms now uses fat arrow (=>)
10111 * `main` no longer accepts an args vector; use `os::args` instead
10114 * Trait implementations are now coherent, ala Haskell typeclasses
10115 * Trait methods may be static
10116 * Argument modes are deprecated
10117 * Borrowed pointers are much more mature and recommended for use
10118 * Strings and vectors in the static region are stored in constant memory
10119 * Typestate was removed
10120 * Resolution rewritten to be more reliable
10121 * Support for 'dual-mode' data structures (freezing and thawing)
10124 * Most binary operators can now be overloaded via the traits in
10126 * `std::net::url` for representing URLs
10127 * Sendable hash maps in `core::send_map`
10128 * `core::task' gained a (currently unsafe) task-local storage API
10131 * An efficient new intertask communication primitive called the pipe,
10132 along with a number of higher-level channel types, in `core::pipes`
10133 * `std::arc`, an atomically reference counted, immutable, shared memory
10135 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10136 * Futures are now based on pipes and sendable
10137 * More robust linked task failure
10138 * Improved task builder API
10141 * Improved error reporting
10142 * Preliminary JIT support
10143 * Preliminary work on precise GC
10144 * Extensive architectural improvements to rustc
10145 * Begun a transition away from buggy C++-based reflection (shape) code to
10146 Rust-based (visitor) code
10147 * All hash functions and tables converted to secure, randomized SipHash
10150 Version 0.3 (2012-07-12)
10151 ========================
10153 * ~1900 changes, numerous bugfixes
10155 * New coding conveniences
10156 * Integer-literal suffix inference
10157 * Per-item control over warnings, errors
10158 * #[cfg(windows)] and #[cfg(unix)] attributes
10159 * Documentation comments
10160 * More compact closure syntax
10161 * 'do' expressions for treating higher-order functions as
10163 * *-patterns (wildcard extended to all constructor fields)
10166 * Name resolution pass and exhaustiveness checker rewritten
10167 * Region pointers and borrow checking supersede alias
10169 * Init-ness checking is now provided by a region-based liveness
10170 pass instead of the typestate pass; same for last-use analysis
10171 * Extensive work on region pointers
10173 * Experimental new language features
10174 * Slices and fixed-size, interior-allocated vectors
10175 * #!-comments for lang versioning, shell execution
10176 * Destructors and iface implementation for classes;
10177 type-parameterized classes and class methods
10178 * 'const' type kind for types that can be used to implement
10179 shared-memory concurrency patterns
10183 * Removal of various obsolete features
10184 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10185 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10187 * Constructs: do-while loops ('do' repurposed), fn binding,
10188 resources (replaced by destructors)
10190 * Compiler reorganization
10191 * Syntax-layer of compiler split into separate crate
10192 * Clang (from LLVM project) integrated into build
10193 * Typechecker split into sub-modules
10196 * New time functions
10197 * Extension methods for many built-in types
10198 * Arc: atomic-refcount read-only / exclusive-use shared cells
10199 * Par: parallel map and search routines
10200 * Extensive work on libuv interface
10201 * Much vector code moved to libraries
10202 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10203 #include, #include_str, #include_bin
10205 * Tool improvements
10206 * Cargo automatically resolves dependencies
10209 Version 0.2 (2012-03-29)
10210 =========================
10212 * >1500 changes, numerous bugfixes
10214 * New docs and doc tooling
10216 * New port: FreeBSD x86_64
10218 * Compilation model enhancements
10219 * Generics now specialized, multiply instantiated
10220 * Functions now inlined across separate crates
10222 * Scheduling, stack and threading fixes
10223 * Noticeably improved message-passing performance
10224 * Explicit schedulers
10228 * Experimental new language features
10229 * Operator overloading
10233 * Various language extensions
10234 * C-callback function types: 'crust fn ...'
10235 * Infinite-loop construct: 'loop { ... }'
10236 * Shorten 'mutable' to 'mut'
10237 * Required mutable-local qualifier: 'let mut ...'
10238 * Basic glob-exporting: 'export foo::*;'
10239 * Alt now exhaustive, 'alt check' for runtime-checked
10240 * Block-function form of 'for' loop, with 'break' and 'ret'.
10243 * AST quasi-quote syntax extension
10244 * Revived libuv interface
10245 * New modules: core::{future, iter}, std::arena
10246 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10247 * Extensive cleanup, regularization in libstd, libcore
10250 Version 0.1 (2012-01-20)
10251 ===============================
10253 * Most language features work, including:
10254 * Unique pointers, unique closures, move semantics
10255 * Interface-constrained generics
10256 * Static interface dispatch
10258 * Multithread task scheduling
10259 * Typestate predicates
10260 * Failure unwinding, destructors
10261 * Pattern matching and destructuring assignment
10262 * Lightweight block-lambda syntax
10263 * Preliminary macro-by-example
10265 * Compiler works with the following configurations:
10266 * Linux: x86 and x86_64 hosts and targets
10267 * macOS: x86 and x86_64 hosts and targets
10268 * Windows: x86 hosts and targets
10270 * Cross compilation / multi-target configuration supported.
10272 * Preliminary API-documentation and package-management tools included.
10276 * Documentation is incomplete.
10278 * Performance is below intended target.
10280 * Standard library APIs are subject to extensive change, reorganization.
10282 * Language-level versioning is not yet operational - future code will
10283 break unexpectedly.