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 - [`leading_zeros`, and `trailing_zeros` are now available on all
45 `NonZero` integer types.][84082]
46 - [`{f32, f64}::from_str` now parse and print special values
47 (`NaN`, `-0`) according to IEEE RFC 754.][78618]
48 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
49 - [Add the `BITS` associated constant to all numeric types.][82565]
53 - [`AtomicBool::fetch_update`]
54 - [`AtomicPtr::fetch_update`]
55 - [`BTreeMap::retain`]
56 - [`BTreeSet::retain`]
57 - [`BufReader::seek_relative`]
58 - [`DebugStruct::non_exhaustive`]
61 - [`Duration::is_zero`]
62 - [`Duration::saturating_add`]
63 - [`Duration::saturating_mul`]
64 - [`Duration::saturating_sub`]
65 - [`ErrorKind::Unsupported`]
74 - [`OsStr::make_ascii_lowercase`]
75 - [`OsStr::make_ascii_uppercase`]
76 - [`OsStr::to_ascii_lowercase`]
77 - [`OsStr::to_ascii_uppercase`]
78 - [`Peekable::peek_mut`]
79 - [`Rc::decrement_strong_count`]
80 - [`Rc::increment_strong_count`]
81 - [`Vec::extend_from_within`]
85 - [`char::REPLACEMENT_CHARACTER`]
86 - [`char::UNICODE_VERSION`]
87 - [`char::decode_utf16`]
88 - [`char::from_digit`]
89 - [`char::from_u32_unchecked`]
95 - [`f32::is_subnormal`]
96 - [`f64::is_subnormal`]
99 -----------------------
100 - [Cargo now supports git repositories where the default `HEAD` branch is not
101 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
102 which can handle default branches correctly.
103 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
104 - [The `authors` field is no longer included in `Cargo.toml` for new
105 projects.][cargo/9282]
108 -----------------------
109 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
110 without hyperlinks.][81764]
114 - [Implement token-based handling of attributes during expansion][82608]
115 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
116 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
117 to confusion and potential security vulnerabilities and [is no
118 longer recommended][ietf6943].
123 These changes provide no direct user facing benefits, but represent significant
124 improvements to the internals and overall performance of rustc and
127 - [Rework the `std::sys::windows::alloc` implementation.][83065]
128 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
129 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
130 - [Rework rustdoc const type][82873]
132 [83386]: https://github.com/rust-lang/rust/pull/83386
133 [82771]: https://github.com/rust-lang/rust/pull/82771
134 [84147]: https://github.com/rust-lang/rust/pull/84147
135 [84082]: https://github.com/rust-lang/rust/pull/84082
136 [83799]: https://github.com/rust-lang/rust/pull/83799
137 [83681]: https://github.com/rust-lang/rust/pull/83681
138 [83652]: https://github.com/rust-lang/rust/pull/83652
139 [83387]: https://github.com/rust-lang/rust/pull/83387
140 [82873]: https://github.com/rust-lang/rust/pull/82873
141 [82864]: https://github.com/rust-lang/rust/pull/82864
142 [82608]: https://github.com/rust-lang/rust/pull/82608
143 [82565]: https://github.com/rust-lang/rust/pull/82565
144 [80525]: https://github.com/rust-lang/rust/pull/80525
145 [79278]: https://github.com/rust-lang/rust/pull/79278
146 [78618]: https://github.com/rust-lang/rust/pull/78618
147 [77704]: https://github.com/rust-lang/rust/pull/77704
148 [83941]: https://github.com/rust-lang/rust/pull/83941
149 [83065]: https://github.com/rust-lang/rust/pull/83065
150 [81764]: https://github.com/rust-lang/rust/pull/81764
151 [81469]: https://github.com/rust-lang/rust/pull/81469
152 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
153 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
154 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
155 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
156 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
157 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
158 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
159 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
160 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
161 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
162 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
163 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
164 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
165 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
166 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
167 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
168 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
169 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
170 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
171 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
172 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
173 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
174 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
175 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
176 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
177 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
178 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
179 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
180 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
181 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
182 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
183 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
184 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
185 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
186 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
187 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
188 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
189 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
190 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
191 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
192 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
193 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
194 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
195 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
196 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
197 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
198 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
199 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
200 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
203 Version 1.52.1 (2021-05-10)
204 ============================
206 This release disables incremental compilation, unless the user has explicitly
207 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
209 This is due to the widespread, and frequently occuring, breakage encountered by
210 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
211 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
212 newly added incremental verification are still present in past stable versions,
213 and are not yet fixed on any channel. These bugs can lead to miscompilation of
216 These problems only affect incremental builds, so release builds with Cargo
217 should not be affected unless the user has explicitly opted into incremental.
218 Debug and check builds are affected.
220 See [84970] for more details.
222 [84970]: https://github.com/rust-lang/rust/issues/84970
224 Version 1.52.0 (2021-05-06)
225 ============================
229 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
230 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
231 is allowed by default, and may become a warning or hard error in a
233 - [You can now cast mutable references to arrays to a pointer of the same type as
238 - [Upgraded the default LLVM to LLVM 12.][81451]
240 Added tier 3\* support for the following targets.
242 - [`s390x-unknown-linux-musl`][82166]
243 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
244 - [`powerpc-unknown-openbsd`][82733]
246 \* Refer to Rust's [platform support page][platform-support-doc] for more
247 information on Rust's tiered platform support.
251 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
252 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
253 - [`Arc<impl Error>` now implements `error::Error`.][80553]
254 - [All integer division and remainder operations are now `const`.][80962]
258 - [`Arguments::as_str`]
260 - [`char::REPLACEMENT_CHARACTER`]
261 - [`char::UNICODE_VERSION`]
262 - [`char::decode_utf16`]
263 - [`char::from_digit`]
264 - [`char::from_u32_unchecked`]
266 - [`slice::partition_point`]
267 - [`str::rsplit_once`]
268 - [`str::split_once`]
270 The following previously stable APIs are now `const`.
273 - [`char::len_utf16`]
274 - [`char::to_ascii_uppercase`]
275 - [`char::to_ascii_lowercase`]
276 - [`char::eq_ignore_ascii_case`]
277 - [`u8::to_ascii_uppercase`]
278 - [`u8::to_ascii_lowercase`]
279 - [`u8::eq_ignore_ascii_case`]
283 - [Rustdoc lints are now treated as a tool lint, meaning that
284 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
285 Using the old style is still allowed, and will become a warning in
287 - [Rustdoc now supports argument files.][82261]
288 - [Rustdoc now generates smart punctuation for documentation.][79423]
289 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
297 - [You can now pass multiple filters to tests.][81356] E.g.
298 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
299 - [Rustup now distributes PDB symbols for the `std` library on Windows,
300 allowing you to see `std` symbols when debugging.][82218]
304 These changes provide no direct user facing benefits, but represent significant
305 improvements to the internals and overall performance of rustc and
308 - [Check the result cache before the DepGraph when ensuring queries][81855]
309 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
310 - [Only store a LocalDefId in some HIR nodes][81611]
311 - [Store HIR attributes in a side table][79519]
315 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
316 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
317 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
318 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
319 languages in code blocks.][78429]
320 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
321 - [Changes in how proc macros handle whitespace may lead to panics when used
322 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
324 [84136]: https://github.com/rust-lang/rust/issues/84136
325 [80763]: https://github.com/rust-lang/rust/pull/80763
326 [82166]: https://github.com/rust-lang/rust/pull/82166
327 [82121]: https://github.com/rust-lang/rust/pull/82121
328 [81879]: https://github.com/rust-lang/rust/pull/81879
329 [82261]: https://github.com/rust-lang/rust/pull/82261
330 [82218]: https://github.com/rust-lang/rust/pull/82218
331 [82216]: https://github.com/rust-lang/rust/pull/82216
332 [82202]: https://github.com/rust-lang/rust/pull/82202
333 [81855]: https://github.com/rust-lang/rust/pull/81855
334 [81766]: https://github.com/rust-lang/rust/pull/81766
335 [81744]: https://github.com/rust-lang/rust/pull/81744
336 [81611]: https://github.com/rust-lang/rust/pull/81611
337 [81479]: https://github.com/rust-lang/rust/pull/81479
338 [81451]: https://github.com/rust-lang/rust/pull/81451
339 [81356]: https://github.com/rust-lang/rust/pull/81356
340 [80962]: https://github.com/rust-lang/rust/pull/80962
341 [80553]: https://github.com/rust-lang/rust/pull/80553
342 [80527]: https://github.com/rust-lang/rust/pull/80527
343 [79519]: https://github.com/rust-lang/rust/pull/79519
344 [79423]: https://github.com/rust-lang/rust/pull/79423
345 [79208]: https://github.com/rust-lang/rust/pull/79208
346 [78429]: https://github.com/rust-lang/rust/pull/78429
347 [82733]: https://github.com/rust-lang/rust/pull/82733
348 [82594]: https://github.com/rust-lang/rust/pull/82594
349 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
350 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
351 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
352 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
353 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
354 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
355 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
356 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
357 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
358 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
359 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
360 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
361 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
362 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
363 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
364 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
365 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
366 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
367 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
368 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
369 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
370 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
372 Version 1.51.0 (2021-03-25)
373 ============================
377 - [You can now parameterize items such as functions, traits, and `struct`s by constant
378 values in addition to by types and lifetimes.][79135] Also known as "const generics"
379 E.g. you can now write the following. Note: Only values of primitive integers,
380 `bool`, or `char` types are currently permitted.
382 struct GenericArray<T, const LENGTH: usize> {
386 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
387 const fn last(&self) -> Option<&T> {
391 Some(&self.inner[LENGTH - 1])
401 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
402 This option controls whether debug information is split across multiple files
403 or packed into a single file. **Note** This option is unstable on other platforms.
404 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
405 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
406 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
407 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
409 \* Refer to Rust's [platform support page][platform-support-doc] for more
410 information on Rust's tiered platform support.
415 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
416 - [`str` now implements `AsMut<str>`.][80279]
417 - [`u64` and `u128` now implement `From<char>`.][79502]
418 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
419 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
420 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
421 - [`io::Empty` now implements `io::Seek`.][78044]
422 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
423 `T: ?Sized` types.][80764]
424 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
430 - [`Arc::decrement_strong_count`]
431 - [`Arc::increment_strong_count`]
432 - [`Once::call_once_force`]
433 - [`Peekable::next_if_eq`]
434 - [`Peekable::next_if`]
435 - [`Seek::stream_position`]
436 - [`array::IntoIter`]
437 - [`panic::panic_any`]
439 - [`ptr::addr_of_mut!`]
440 - [`slice::fill_with`]
441 - [`slice::split_inclusive_mut`]
442 - [`slice::split_inclusive`]
443 - [`slice::strip_prefix`]
444 - [`slice::strip_suffix`]
445 - [`str::split_inclusive`]
446 - [`sync::OnceState`]
448 - [`VecDeque::range`]
449 - [`VecDeque::range_mut`]
453 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
454 codegen option.][cargo/9112]
455 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
456 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
457 to avoid unifying features of dependencies where that unification could be unwanted.
458 Such as using the same dependency with a `std` feature in a build scripts and
459 proc-macros, while using the `no-std` feature in the final binary. See the
460 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
465 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
466 - [You can now provide a `--default-theme` flag which sets the default theme to use for
467 documentation.][79642]
469 Various improvements to intra-doc links:
471 - [You can link to non-path primitives such as `slice`.][80181]
472 - [You can link to associated items.][74489]
473 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
477 - [You can now pass `--include-ignored` to tests (e.g. with
478 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
483 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
484 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
486 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
487 for the distributed artifacts.][81521]
488 - `armv5te-unknown-linux-gnueabi`
489 - `sparc64-unknown-linux-gnu`
490 - `thumbv7neon-unknown-linux-gnueabihf`
491 - `armv7-unknown-linux-gnueabi`
492 - `x86_64-unknown-linux-gnux32`
493 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
498 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
500 [79135]: https://github.com/rust-lang/rust/pull/79135
501 [74489]: https://github.com/rust-lang/rust/pull/74489
502 [76934]: https://github.com/rust-lang/rust/pull/76934
503 [79570]: https://github.com/rust-lang/rust/pull/79570
504 [80181]: https://github.com/rust-lang/rust/pull/80181
505 [79642]: https://github.com/rust-lang/rust/pull/79642
506 [80945]: https://github.com/rust-lang/rust/pull/80945
507 [80279]: https://github.com/rust-lang/rust/pull/80279
508 [80053]: https://github.com/rust-lang/rust/pull/80053
509 [79502]: https://github.com/rust-lang/rust/pull/79502
510 [75180]: https://github.com/rust-lang/rust/pull/75180
511 [79135]: https://github.com/rust-lang/rust/pull/79135
512 [81521]: https://github.com/rust-lang/rust/pull/81521
513 [80968]: https://github.com/rust-lang/rust/pull/80968
514 [80959]: https://github.com/rust-lang/rust/pull/80959
515 [80718]: https://github.com/rust-lang/rust/pull/80718
516 [80653]: https://github.com/rust-lang/rust/pull/80653
517 [80579]: https://github.com/rust-lang/rust/pull/80579
518 [79998]: https://github.com/rust-lang/rust/pull/79998
519 [78044]: https://github.com/rust-lang/rust/pull/78044
520 [81455]: https://github.com/rust-lang/rust/pull/81455
521 [80764]: https://github.com/rust-lang/rust/pull/80764
522 [80749]: https://github.com/rust-lang/rust/pull/80749
523 [80662]: https://github.com/rust-lang/rust/pull/80662
524 [79134]: https://github.com/rust-lang/rust/pull/79134
525 [80966]: https://github.com/rust-lang/rust/pull/80966
526 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
527 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
528 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
529 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
530 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
531 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
532 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
533 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
534 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
535 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
536 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
537 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
538 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
539 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
540 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
541 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
542 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
543 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
544 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
545 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
546 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
547 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
548 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
550 Version 1.50.0 (2021-02-11)
551 ============================
554 -----------------------
555 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
556 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
557 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
560 -----------------------
561 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
562 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
563 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
564 - [Dropped support for all cloudabi targets.][78439]
566 \* Refer to Rust's [platform support page][platform-support-doc] for more
567 information on Rust's tiered platform support.
570 -----------------------
572 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
573 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
574 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
575 This value cannot be a valid file descriptor, and now means `Option<File>` takes
576 up the same amount of space as `File`.
582 - [`btree_map::Entry::or_insert_with_key`]
585 - [`hash_map::Entry::or_insert_with_key`]
589 - [`UnsafeCell::get_mut`]
591 The following previously stable methods are now `const`.
593 - [`IpAddr::is_ipv4`]
594 - [`IpAddr::is_ipv6`]
595 - [`IpAddr::is_unspecified`]
596 - [`IpAddr::is_loopback`]
597 - [`IpAddr::is_multicast`]
598 - [`Ipv4Addr::octets`]
599 - [`Ipv4Addr::is_loopback`]
600 - [`Ipv4Addr::is_private`]
601 - [`Ipv4Addr::is_link_local`]
602 - [`Ipv4Addr::is_multicast`]
603 - [`Ipv4Addr::is_broadcast`]
604 - [`Ipv4Addr::is_documentation`]
605 - [`Ipv4Addr::to_ipv6_compatible`]
606 - [`Ipv4Addr::to_ipv6_mapped`]
607 - [`Ipv6Addr::segments`]
608 - [`Ipv6Addr::is_unspecified`]
609 - [`Ipv6Addr::is_loopback`]
610 - [`Ipv6Addr::is_multicast`]
611 - [`Ipv6Addr::to_ipv4`]
614 - [`Layout::from_size_align`]
615 - `pow` for all integer types.
616 - `checked_pow` for all integer types.
617 - `saturating_pow` for all integer types.
618 - `wrapping_pow` for all integer types.
619 - `next_power_of_two` for all unsigned integer types.
620 - `checked_next_power_of_two` for all unsigned integer types.
623 -----------------------
625 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
626 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
627 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
628 contents of that directory for changes.][cargo/8973]
629 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
634 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
635 - [Running tests will now print the total time taken to execute.][75752]
640 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
641 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
642 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
643 unhygenic `macro_rules!` macros.][79472]
644 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
645 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
646 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
647 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
648 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
649 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
651 [74989]: https://github.com/rust-lang/rust/pull/74989
652 [79261]: https://github.com/rust-lang/rust/pull/79261
653 [79896]: https://github.com/rust-lang/rust/pull/79896
654 [79484]: https://github.com/rust-lang/rust/pull/79484
655 [79472]: https://github.com/rust-lang/rust/pull/79472
656 [79270]: https://github.com/rust-lang/rust/pull/79270
657 [79003]: https://github.com/rust-lang/rust/pull/79003
658 [78864]: https://github.com/rust-lang/rust/pull/78864
659 [78636]: https://github.com/rust-lang/rust/pull/78636
660 [78439]: https://github.com/rust-lang/rust/pull/78439
661 [78343]: https://github.com/rust-lang/rust/pull/78343
662 [78296]: https://github.com/rust-lang/rust/pull/78296
663 [78068]: https://github.com/rust-lang/rust/pull/78068
664 [75752]: https://github.com/rust-lang/rust/pull/75752
665 [74699]: https://github.com/rust-lang/rust/pull/74699
666 [78142]: https://github.com/rust-lang/rust/pull/78142
667 [77484]: https://github.com/rust-lang/rust/pull/77484
668 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
669 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
670 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
671 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
672 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
673 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
674 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
675 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
676 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
677 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
678 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
679 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
680 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
681 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
682 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
683 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
684 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
685 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
686 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
687 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
688 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
689 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
690 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
691 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
692 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
693 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
694 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
695 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
696 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
697 [`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
698 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
699 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
700 [`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
701 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
704 Version 1.49.0 (2020-12-31)
705 ============================
708 -----------------------
710 - [Unions can now implement `Drop`, and you can now have a field in a union
711 with `ManuallyDrop<T>`.][77547]
712 - [You can now cast uninhabited enums to integers.][76199]
713 - [You can now bind by reference and by move in patterns.][76119] This
714 allows you to selectively borrow individual components of a type. E.g.
722 let person = Person {
723 name: String::from("Alice"),
727 // `name` is moved out of person, but `age` is referenced.
728 let Person { name, ref age } = person;
729 println!("{} {}", name, age);
733 -----------------------
735 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
736 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
737 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
738 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
739 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
740 - [Output from threads spawned in tests is now captured.][78227]
741 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
743 \* Refer to Rust's [platform support page][platform-support-doc] for more
744 information on Rust's tiered platform support.
747 -----------------------
749 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
750 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
755 - [`slice::select_nth_unstable`]
756 - [`slice::select_nth_unstable_by`]
757 - [`slice::select_nth_unstable_by_key`]
759 The following previously stable methods are now `const`.
762 - [`Poll::is_pending`]
765 -----------------------
766 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
767 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
768 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
769 variable will be set if the crate being built is one the user selected to build, either
770 with `-p` or through defaults.
771 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
777 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
778 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
779 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
780 Previously such invalid or unused attributes could be ignored.
781 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
782 read [this post about the changes][rustdoc-ws-post] for more details.
783 - [Trait bounds are no longer inferred for associated types.][79904]
787 These changes provide no direct user facing benefits, but represent significant
788 improvements to the internals and overall performance of rustc and
791 - [rustc's internal crates are now compiled using the `initial-exec` Thread
792 Local Storage model.][78201]
793 - [Calculate visibilities once in resolve.][78077]
794 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
795 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
798 [75991]: https://github.com/rust-lang/rust/pull/75991
799 [78951]: https://github.com/rust-lang/rust/pull/78951
800 [78848]: https://github.com/rust-lang/rust/pull/78848
801 [78746]: https://github.com/rust-lang/rust/pull/78746
802 [78376]: https://github.com/rust-lang/rust/pull/78376
803 [78228]: https://github.com/rust-lang/rust/pull/78228
804 [78227]: https://github.com/rust-lang/rust/pull/78227
805 [78201]: https://github.com/rust-lang/rust/pull/78201
806 [78109]: https://github.com/rust-lang/rust/pull/78109
807 [78077]: https://github.com/rust-lang/rust/pull/78077
808 [77997]: https://github.com/rust-lang/rust/pull/77997
809 [77703]: https://github.com/rust-lang/rust/pull/77703
810 [77547]: https://github.com/rust-lang/rust/pull/77547
811 [77015]: https://github.com/rust-lang/rust/pull/77015
812 [76199]: https://github.com/rust-lang/rust/pull/76199
813 [76119]: https://github.com/rust-lang/rust/pull/76119
814 [75914]: https://github.com/rust-lang/rust/pull/75914
815 [79004]: https://github.com/rust-lang/rust/pull/79004
816 [78676]: https://github.com/rust-lang/rust/pull/78676
817 [79904]: https://github.com/rust-lang/rust/issues/79904
818 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
819 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
820 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
821 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
822 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
823 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
824 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
825 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
826 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
827 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
828 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
830 Version 1.48.0 (2020-11-19)
831 ==========================
836 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
837 is still rejected *semantically*, but can now be parsed by procedural macros.
841 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
842 `rustc` whether to link its own C runtime and libraries or to rely on a external
843 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
844 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
845 Note: If you're using cargo you must explicitly pass the `--target` flag.
846 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
848 \* Refer to Rust's [platform support page][platform-support-doc] for more
849 information on Rust's tiered platform support.
853 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
854 and `&Stderr`.][76275]
855 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
856 - [The `matches!` macro now supports having a trailing comma.][74880]
857 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
858 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
862 - [`slice::as_ptr_range`]
863 - [`slice::as_mut_ptr_range`]
864 - [`VecDeque::make_contiguous`]
865 - [`future::pending`]
868 The following previously stable methods are now `const fn`'s:
870 - [`Option::is_some`]
871 - [`Option::is_none`]
876 - [`Ordering::reverse`]
884 - [You can now link to items in `rustdoc` using the intra-doc link
885 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
886 a link to `std::future`'s documentation. See ["Linking to items by
887 name"][intradoc-links] for more information.
888 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
889 when searching through `rustdoc`'s UI.][75740]
893 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
894 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
895 promoted to `'static` lifetime any more inside `const fn`s.
896 - [Associated type bindings on trait objects are now verified to meet the bounds
897 declared on the trait when checking that they implement the trait.][27675]
898 - [When trait bounds on associated types or opaque types are ambiguous, the
899 compiler no longer makes an arbitrary choice on which bound to use.][54121]
900 - [Fixed recursive nonterminals not being expanded in macros during
901 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
902 correctly handling recursive nonterminal tokens.
903 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
904 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
905 in places where they have no effect.][73461]
906 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
907 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
908 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
909 disallow zero-initialization.][71274]
910 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
911 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
912 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
913 see the [`catch_unwind`] documentation for further information.
919 These changes provide no direct user facing benefits, but represent significant
920 improvements to the internals and overall performance of rustc and
923 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
924 You can continue building with `make` by setting `ninja=false` in
926 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
927 - [Made `ensure_sufficient_stack()` non-generic][76680]
929 [78143]: https://github.com/rust-lang/rust/issues/78143
930 [76680]: https://github.com/rust-lang/rust/pull/76680/
931 [76030]: https://github.com/rust-lang/rust/pull/76030/
932 [70212]: https://github.com/rust-lang/rust/pull/70212/
933 [27675]: https://github.com/rust-lang/rust/issues/27675/
934 [54121]: https://github.com/rust-lang/rust/issues/54121/
935 [71274]: https://github.com/rust-lang/rust/pull/71274/
936 [77386]: https://github.com/rust-lang/rust/pull/77386/
937 [77153]: https://github.com/rust-lang/rust/pull/77153/
938 [77055]: https://github.com/rust-lang/rust/pull/77055/
939 [76275]: https://github.com/rust-lang/rust/pull/76275/
940 [76310]: https://github.com/rust-lang/rust/pull/76310/
941 [76420]: https://github.com/rust-lang/rust/pull/76420/
942 [76158]: https://github.com/rust-lang/rust/pull/76158/
943 [75857]: https://github.com/rust-lang/rust/pull/75857/
944 [75585]: https://github.com/rust-lang/rust/pull/75585/
945 [75740]: https://github.com/rust-lang/rust/pull/75740/
946 [75502]: https://github.com/rust-lang/rust/pull/75502/
947 [74880]: https://github.com/rust-lang/rust/pull/74880/
948 [74922]: https://github.com/rust-lang/rust/pull/74922/
949 [74430]: https://github.com/rust-lang/rust/pull/74430/
950 [74194]: https://github.com/rust-lang/rust/pull/74194/
951 [73461]: https://github.com/rust-lang/rust/pull/73461/
952 [73166]: https://github.com/rust-lang/rust/pull/73166/
953 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
954 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
955 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
956 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
957 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
958 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
959 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
960 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
961 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
962 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
963 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
964 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
965 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
966 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
967 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
970 Version 1.47.0 (2020-10-08)
971 ==========================
975 - [Closures will now warn when not used.][74869]
979 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
980 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
982 - [Upgraded to LLVM 11.][73526]
983 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
984 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
985 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
987 \* Refer to Rust's [platform support page][platform-support-doc] for more
988 information on Rust's tiered platform support.
992 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
993 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
994 those of length less than 33.][74060]
995 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
996 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
997 `PartialEq`, and `PartialOrd`.][73583]
1001 - [`Ident::new_raw`]
1002 - [`Range::is_empty`]
1003 - [`RangeInclusive::is_empty`]
1004 - [`Result::as_deref`]
1005 - [`Result::as_deref_mut`]
1007 - [`pointer::offset_from`]
1011 The following previously stable APIs have now been made const.
1013 - [The `new` method for all `NonZero` integers.][73858]
1014 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1015 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1016 methods for all integers.][73858]
1017 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1018 signed integers.][73858]
1019 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1020 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1021 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1022 `is_ascii_control` methods for `char` and `u8`.][73858]
1026 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1027 You can override this by setting the following in your `Cargo.toml`.
1029 [profile.release.build-override]
1032 - [`cargo-help` will now display man pages for commands rather just the
1033 `--help` text.][cargo/8456]
1034 - [`cargo-metadata` now emits a `test` field indicating if a target has
1035 tests enabled.][cargo/8478]
1036 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1037 - [`cargo-publish` will now use an alternative registry by default if it's the
1038 only registry specified in `package.publish`.][cargo/8571]
1042 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1043 type based search.][75366]
1044 - [Added the Ayu theme to rustdoc.][71237]
1048 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1049 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1050 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1051 help to preserve more span information.][73084] These changes may cause
1052 compiliation errors if your macro was unhygenic or didn't correctly handle
1054 - [Moved support for the CloudABI target to tier 3.][75568]
1055 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1056 - [Added the `rustc-docs` component.][75560] This allows you to install
1057 and read the documentation for the compiler internal APIs. (Currently only
1058 available for `x86_64-unknown-linux-gnu`.)
1063 - [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.
1065 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1066 [75048]: https://github.com/rust-lang/rust/pull/75048/
1067 [74163]: https://github.com/rust-lang/rust/pull/74163/
1068 [71237]: https://github.com/rust-lang/rust/pull/71237/
1069 [74869]: https://github.com/rust-lang/rust/pull/74869/
1070 [73858]: https://github.com/rust-lang/rust/pull/73858/
1071 [75716]: https://github.com/rust-lang/rust/pull/75716/
1072 [75908]: https://github.com/rust-lang/rust/pull/75908/
1073 [75516]: https://github.com/rust-lang/rust/pull/75516/
1074 [75560]: https://github.com/rust-lang/rust/pull/75560/
1075 [75568]: https://github.com/rust-lang/rust/pull/75568/
1076 [75366]: https://github.com/rust-lang/rust/pull/75366/
1077 [75204]: https://github.com/rust-lang/rust/pull/75204/
1078 [74650]: https://github.com/rust-lang/rust/pull/74650/
1079 [74419]: https://github.com/rust-lang/rust/pull/74419/
1080 [73964]: https://github.com/rust-lang/rust/pull/73964/
1081 [74021]: https://github.com/rust-lang/rust/pull/74021/
1082 [74060]: https://github.com/rust-lang/rust/pull/74060/
1083 [73893]: https://github.com/rust-lang/rust/pull/73893/
1084 [73526]: https://github.com/rust-lang/rust/pull/73526/
1085 [73583]: https://github.com/rust-lang/rust/pull/73583/
1086 [73084]: https://github.com/rust-lang/rust/pull/73084/
1087 [73197]: https://github.com/rust-lang/rust/pull/73197/
1088 [72488]: https://github.com/rust-lang/rust/pull/72488/
1089 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1090 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1091 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1092 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1093 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1094 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1095 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1096 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1097 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1098 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1099 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1100 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1101 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1102 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1103 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1106 Version 1.46.0 (2020-08-27)
1107 ==========================
1111 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1112 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1113 const functions.][73862]
1114 - [The `#[track_caller]` attribute can now be added to functions to use the
1115 function's caller's location information for panic messages.][72445]
1116 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1117 `x.0.0` over `(x.0).0`.
1118 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1119 You currently can't use `mem::transmute` in constant functions.
1123 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1124 - [Enabled static "Position Independent Executables" by default
1125 for `x86_64-unknown-linux-musl`.][70740]
1129 - [`mem::forget` is now a `const fn`.][73887]
1130 - [`String` now implements `From<char>`.][73466]
1131 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1132 integer types.][73032]
1133 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1134 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1135 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1136 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1137 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1138 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1143 - [`vec::Drain::as_slice`]
1147 Added a number of new environment variables that are now available when
1148 compiling your crate.
1150 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1151 the specific binary being compiled and the name of the crate.
1152 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1153 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1157 - [The target configuration option `abi_blacklist` has been renamed
1158 to `unsupported_abis`.][74150] The old name will still continue to work.
1159 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1160 This was previously accepted but will become a hard error in a future release.
1161 - [Rustc will fail to compile if you have a struct with
1162 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1164 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1165 ensure that spans have the correct information, and may cause breakage if you
1166 were relying on receiving spans with dummy information.
1167 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1168 a legacy installer that was replaced by a MSI installer a few years ago but
1169 was still being built.
1170 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1171 - [Rustc will no longer accept overlapping trait implementations that only
1172 differ in how the lifetime was bound.][72493]
1173 - [Rustc now correctly relates the lifetime of an existential associated
1174 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1175 you to pass a shorter lifetime than expected.
1176 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1177 The library will need to be installed for `rustc` to work, even though we
1178 expect it to be already available on most systems.
1179 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1181 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1182 exact output returned by rustc's pretty printing is an unstable
1183 implementation detail: we recommend any macro relying on it to switch to a
1184 more robust parsing system.
1186 [75453]: https://github.com/rust-lang/rust/issues/75453/
1187 [74820]: https://github.com/rust-lang/rust/issues/74820/
1188 [74420]: https://github.com/rust-lang/rust/issues/74420/
1189 [74109]: https://github.com/rust-lang/rust/pull/74109/
1190 [74150]: https://github.com/rust-lang/rust/pull/74150/
1191 [73862]: https://github.com/rust-lang/rust/pull/73862/
1192 [73887]: https://github.com/rust-lang/rust/pull/73887/
1193 [73466]: https://github.com/rust-lang/rust/pull/73466/
1194 [73516]: https://github.com/rust-lang/rust/pull/73516/
1195 [73293]: https://github.com/rust-lang/rust/pull/73293/
1196 [73007]: https://github.com/rust-lang/rust/pull/73007/
1197 [73032]: https://github.com/rust-lang/rust/pull/73032/
1198 [72920]: https://github.com/rust-lang/rust/pull/72920/
1199 [72569]: https://github.com/rust-lang/rust/pull/72569/
1200 [72583]: https://github.com/rust-lang/rust/pull/72583/
1201 [72584]: https://github.com/rust-lang/rust/pull/72584/
1202 [72717]: https://github.com/rust-lang/rust/pull/72717/
1203 [72437]: https://github.com/rust-lang/rust/pull/72437/
1204 [72445]: https://github.com/rust-lang/rust/pull/72445/
1205 [72486]: https://github.com/rust-lang/rust/pull/72486/
1206 [72493]: https://github.com/rust-lang/rust/pull/72493/
1207 [72331]: https://github.com/rust-lang/rust/pull/72331/
1208 [71896]: https://github.com/rust-lang/rust/pull/71896/
1209 [71660]: https://github.com/rust-lang/rust/pull/71660/
1210 [71322]: https://github.com/rust-lang/rust/pull/71322/
1211 [70740]: https://github.com/rust-lang/rust/pull/70740/
1212 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1213 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1214 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1215 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1216 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1219 Version 1.45.2 (2020-08-03)
1220 ==========================
1222 * [Fix bindings in tuple struct patterns][74954]
1223 * [Fix track_caller integration with trait objects][74784]
1225 [74954]: https://github.com/rust-lang/rust/issues/74954
1226 [74784]: https://github.com/rust-lang/rust/issues/74784
1229 Version 1.45.1 (2020-07-30)
1230 ==========================
1232 * [Fix const propagation with references.][73613]
1233 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1234 * [Avoid spurious implicit region bound.][74509]
1235 * [Install clippy on x.py install][74457]
1237 [73613]: https://github.com/rust-lang/rust/pull/73613
1238 [73078]: https://github.com/rust-lang/rust/issues/73078
1239 [74509]: https://github.com/rust-lang/rust/pull/74509
1240 [74457]: https://github.com/rust-lang/rust/pull/74457
1243 Version 1.45.0 (2020-07-16)
1244 ==========================
1248 - [Out of range float to int conversions using `as` has been defined as a saturating
1249 conversion.][71269] This was previously undefined behaviour, but you can use the
1250 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1251 may be desirable in rare performance sensitive situations.
1252 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1253 using `u64`.][70705]
1254 - [Function like procedural macros can now be used in expression, pattern, and statement
1255 positions.][68717] This means you can now use a function-like procedural macro
1256 anywhere you can use a declarative (`macro_rules!`) macro.
1260 - [You can now override individual target features through the `target-feature`
1261 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1262 equivalent to `-C target-feature=+avx2,+fma`.
1263 - [Added the `force-unwind-tables` flag.][69984] This option allows
1264 rustc to always generate unwind tables regardless of panic strategy.
1265 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1266 to include LLVM bitcode into generated `rlib`s (this is on by default).
1267 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1268 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1269 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1270 - [Upgraded to LLVM 10.][67759]
1272 \* Refer to Rust's [platform support page][platform-support-doc] for more
1273 information on Rust's tiered platform support.
1278 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1280 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1281 - [You can now use `char` with
1282 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1283 a range of codepoints.][72413] E.g.
1284 you can now write the following;
1286 for ch in 'a'..='z' {
1290 // Prints "abcdefghijklmnopqrstuvwxyz"
1292 - [`OsString` now implements `FromStr`.][71662]
1293 - [The `saturating_neg` method has been added to all signed integer primitive
1294 types, and the `saturating_abs` method has been added for all integer
1295 primitive types.][71886]
1296 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1297 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1299 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1300 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1301 integer types.][69813]
1302 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1303 integer types.][72324]
1304 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1309 - [`BTreeMap::remove_entry`]
1311 - [`rc::Weak::as_ptr`]
1312 - [`rc::Weak::from_raw`]
1313 - [`rc::Weak::into_raw`]
1314 - [`str::strip_prefix`]
1315 - [`str::strip_suffix`]
1316 - [`sync::Weak::as_ptr`]
1317 - [`sync::Weak::from_raw`]
1318 - [`sync::Weak::into_raw`]
1319 - [`char::UNICODE_VERSION`]
1320 - [`Span::resolved_at`]
1321 - [`Span::located_at`]
1322 - [`Span::mixed_site`]
1323 - [`unix::process::CommandExt::arg0`]
1328 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1333 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1334 `~~outdated information~~` becomes "~~outdated information~~".
1335 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1339 - [Trying to self initialize a static value (that is creating a value using
1340 itself) is unsound and now causes a compile error.][71140]
1341 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1342 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1343 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1344 previously undocumented and not intended for public use. Rustdoc still provides
1345 a non-zero exit code on errors.
1346 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1347 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1348 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1349 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1350 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1354 - [Make clippy a git subtree instead of a git submodule][70655]
1355 - [Unify the undo log of all snapshot types][69464]
1357 [71848]: https://github.com/rust-lang/rust/issues/71848/
1358 [73420]: https://github.com/rust-lang/rust/issues/73420/
1359 [72324]: https://github.com/rust-lang/rust/pull/72324/
1360 [71843]: https://github.com/rust-lang/rust/pull/71843/
1361 [71886]: https://github.com/rust-lang/rust/pull/71886/
1362 [72234]: https://github.com/rust-lang/rust/pull/72234/
1363 [72239]: https://github.com/rust-lang/rust/pull/72239/
1364 [72397]: https://github.com/rust-lang/rust/pull/72397/
1365 [72413]: https://github.com/rust-lang/rust/pull/72413/
1366 [72014]: https://github.com/rust-lang/rust/pull/72014/
1367 [72062]: https://github.com/rust-lang/rust/pull/72062/
1368 [72094]: https://github.com/rust-lang/rust/pull/72094/
1369 [72133]: https://github.com/rust-lang/rust/pull/72133/
1370 [67759]: https://github.com/rust-lang/rust/pull/67759/
1371 [71900]: https://github.com/rust-lang/rust/pull/71900/
1372 [71928]: https://github.com/rust-lang/rust/pull/71928/
1373 [71662]: https://github.com/rust-lang/rust/pull/71662/
1374 [71716]: https://github.com/rust-lang/rust/pull/71716/
1375 [71447]: https://github.com/rust-lang/rust/pull/71447/
1376 [71269]: https://github.com/rust-lang/rust/pull/71269/
1377 [71095]: https://github.com/rust-lang/rust/pull/71095/
1378 [71140]: https://github.com/rust-lang/rust/pull/71140/
1379 [70655]: https://github.com/rust-lang/rust/pull/70655/
1380 [70705]: https://github.com/rust-lang/rust/pull/70705/
1381 [69984]: https://github.com/rust-lang/rust/pull/69984/
1382 [69813]: https://github.com/rust-lang/rust/pull/69813/
1383 [69464]: https://github.com/rust-lang/rust/pull/69464/
1384 [68717]: https://github.com/rust-lang/rust/pull/68717/
1385 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1386 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1387 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1388 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1389 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1390 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1391 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1392 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1393 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1394 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1395 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1396 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1397 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1398 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1399 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1400 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1401 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1404 Version 1.44.1 (2020-06-18)
1405 ===========================
1407 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1408 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1409 * [Fix crashes when finding backtrace on macOS.][71397]
1410 * [Clippy applies lint levels into different files.][clippy/5356]
1412 [71397]: https://github.com/rust-lang/rust/issues/71397
1413 [73078]: https://github.com/rust-lang/rust/issues/73078
1414 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1415 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1418 Version 1.44.0 (2020-06-04)
1419 ==========================
1423 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1424 - [Added the `unused_braces` lint.][70081]
1426 **Syntax-only changes**
1428 - [Expansion-driven outline module parsing][69838]
1433 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1438 These are still rejected semantically, so you will likely receive an error but
1439 these changes can be seen and parsed by macros and conditional compilation.
1443 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1444 Additionally when in incremental mode rustc defaults to 256 codegen units.
1445 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1446 a panic is thrown.][67502]
1447 - [Added tier 3\* support for the `aarch64-unknown-none` and
1448 `aarch64-unknown-none-softfloat` targets.][68334]
1449 - [Added tier 3 support for `arm64-apple-tvos` and
1450 `x86_64-apple-tvos` targets.][68191]
1455 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1456 `vec![]` to be able to be used in `const` contexts.
1457 - [`convert::Infallible` now implements `Hash`.][70281]
1458 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1459 a `&mut OsStr`.][70048]
1460 - [Unicode 13 is now supported.][69929]
1461 - [`String` now implements `From<&mut str>`.][69661]
1462 - [`IoSlice` now implements `Copy`.][69403]
1463 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1464 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1465 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1466 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1467 integer types.][69373]
1471 - [`PathBuf::with_capacity`]
1472 - [`PathBuf::capacity`]
1473 - [`PathBuf::clear`]
1474 - [`PathBuf::reserve`]
1475 - [`PathBuf::reserve_exact`]
1476 - [`PathBuf::shrink_to_fit`]
1477 - [`f32::to_int_unchecked`]
1478 - [`f64::to_int_unchecked`]
1479 - [`Layout::align_to`]
1480 - [`Layout::pad_to_align`]
1482 - [`Layout::extend`]
1486 - [Added the `cargo tree` command which will print a tree graph of
1487 your dependencies.][cargo/8062] E.g.
1489 mdbook v0.3.2 (/Users/src/rust/mdbook)
1491 │ ├── html5ever v0.24.0
1493 │ │ │ └── cfg-if v0.1.9
1495 │ │ └── markup5ever v0.9.0
1496 │ │ ├── log v0.4.8 (*)
1498 │ │ │ └── phf_shared v0.7.24
1499 │ │ │ ├── siphasher v0.2.3
1500 │ │ │ └── unicase v1.4.2
1501 │ │ │ [build-dependencies]
1502 │ │ │ └── version_check v0.1.5
1505 You can also display dependencies on multiple versions of the same crate with
1506 `cargo tree -d` (short for `cargo tree --duplicates`).
1510 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1511 the version in the sidebar.][69494]
1515 - [Rustc now correctly generates static libraries on Windows GNU targets with
1516 the `.a` extension, rather than the previous `.lib`.][70937]
1517 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1518 - [The `file_name` property in JSON output of macro errors now points the actual
1519 source file rather than the previous format of `<NAME macros>`.][70969]
1520 **Note:** this may not point to a file that actually exists on the user's system.
1521 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1522 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1523 not allow zero initialization such as `NonZeroU8`.][66059] This was
1524 previously a warning.
1525 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1526 operator has been defined as a saturating operation.][71269] This was previously
1527 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1528 continue using the current behaviour, which may be desirable in rare performance
1529 sensitive situations.
1533 These changes provide no direct user facing benefits, but represent significant
1534 improvements to the internals and overall performance of rustc and
1537 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1538 - [Replace big JS dict with JSON parsing.][71250]
1540 [69373]: https://github.com/rust-lang/rust/pull/69373/
1541 [66059]: https://github.com/rust-lang/rust/pull/66059/
1542 [68191]: https://github.com/rust-lang/rust/pull/68191/
1543 [68899]: https://github.com/rust-lang/rust/pull/68899/
1544 [71147]: https://github.com/rust-lang/rust/pull/71147/
1545 [71250]: https://github.com/rust-lang/rust/pull/71250/
1546 [70937]: https://github.com/rust-lang/rust/pull/70937/
1547 [70969]: https://github.com/rust-lang/rust/pull/70969/
1548 [70632]: https://github.com/rust-lang/rust/pull/70632/
1549 [70281]: https://github.com/rust-lang/rust/pull/70281/
1550 [70345]: https://github.com/rust-lang/rust/pull/70345/
1551 [70048]: https://github.com/rust-lang/rust/pull/70048/
1552 [70081]: https://github.com/rust-lang/rust/pull/70081/
1553 [70156]: https://github.com/rust-lang/rust/pull/70156/
1554 [71269]: https://github.com/rust-lang/rust/pull/71269/
1555 [69838]: https://github.com/rust-lang/rust/pull/69838/
1556 [69929]: https://github.com/rust-lang/rust/pull/69929/
1557 [69661]: https://github.com/rust-lang/rust/pull/69661/
1558 [69778]: https://github.com/rust-lang/rust/pull/69778/
1559 [69494]: https://github.com/rust-lang/rust/pull/69494/
1560 [69403]: https://github.com/rust-lang/rust/pull/69403/
1561 [69033]: https://github.com/rust-lang/rust/pull/69033/
1562 [68692]: https://github.com/rust-lang/rust/pull/68692/
1563 [68334]: https://github.com/rust-lang/rust/pull/68334/
1564 [67502]: https://github.com/rust-lang/rust/pull/67502/
1565 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1566 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1567 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1568 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1569 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1570 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1571 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1572 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1573 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1574 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1575 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1576 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1577 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1580 Version 1.43.1 (2020-05-07)
1581 ===========================
1583 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1584 * [Fixed the stabilization of AVX-512 features.][71473]
1585 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1587 [71430]: https://github.com/rust-lang/rust/pull/71430
1588 [71473]: https://github.com/rust-lang/rust/issues/71473
1589 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1592 Version 1.43.0 (2020-04-23)
1593 ==========================
1597 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1598 the type inferred correctly.][68129]
1599 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1601 **Syntax only changes**
1602 - [Allow `type Foo: Ord` syntactically.][69361]
1603 - [Fuse associated and extern items up to defaultness.][69194]
1604 - [Syntactically allow `self` in all `fn` contexts.][68764]
1605 - [Merge `fn` syntax + cleanup item parsing.][68728]
1606 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1607 For example, you may now write:
1609 macro_rules! mac_trait {
1619 These are still rejected *semantically*, so you will likely receive an error but
1620 these changes can be seen and parsed by macros and
1621 conditional compilation.
1626 - [You can now pass multiple lint flags to rustc to override the previous
1627 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1628 everything in the `unused` lint group except `unused-variables` which
1629 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1630 everything in the `unused` lint group **including** `unused-variables` since
1631 the allow flag is specified before the deny flag (and therefore overridden).
1632 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1633 if they are available on `windows-gnu`.][67429]
1634 - [rustc now buffers errors/warnings printed in JSON.][69227]
1638 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1639 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1640 respectively.][69538] **Note** These conversions are only available when `N`
1642 - [You can now use associated constants on floats and integers directly, rather
1643 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1644 `f32::NAN` with no imports.
1645 - [`u8::is_ascii` is now `const`.][68984]
1646 - [`String` now implements `AsMut<str>`.][68742]
1647 - [Added the `primitive` module to `std` and `core`.][67637] This module
1648 reexports Rust's primitive types. This is mainly useful in macros
1649 where you want avoid these types being shadowed.
1650 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1651 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1655 - [`Once::is_completed`]
1660 - [`iter::once_with`]
1664 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1665 your environment.][cargo/7823]
1666 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1667 executable path when running integration tests or benchmarks.][cargo/7697]
1668 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1669 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1673 - [Certain checks in the `const_err` lint were deemed unrelated to const
1674 evaluation][69185], and have been moved to the `unconditional_panic` and
1675 `arithmetic_overflow` lints.
1680 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1681 has been a warning since 1.36.0.
1682 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1683 led to some instances being accepted, and now correctly emits a hard error.
1685 [69340]: https://github.com/rust-lang/rust/pull/69340
1689 These changes provide no direct user facing benefits, but represent significant
1690 improvements to the internals and overall performance of `rustc` and
1693 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1694 - [Improved how rustc generates drop code.][67332]
1695 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1696 - [traits: preallocate 2 Vecs of known initial size][69022]
1697 - [Avoid exponential behaviour when relating types][68772]
1698 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1699 - [Improve performance of coherence checks][68966]
1700 - [Deduplicate types in the generator witness][68672]
1701 - [Invert control in struct_lint_level.][68725]
1703 [67332]: https://github.com/rust-lang/rust/pull/67332/
1704 [67429]: https://github.com/rust-lang/rust/pull/67429/
1705 [67637]: https://github.com/rust-lang/rust/pull/67637/
1706 [67642]: https://github.com/rust-lang/rust/pull/67642/
1707 [67878]: https://github.com/rust-lang/rust/pull/67878/
1708 [67885]: https://github.com/rust-lang/rust/pull/67885/
1709 [68129]: https://github.com/rust-lang/rust/pull/68129/
1710 [68672]: https://github.com/rust-lang/rust/pull/68672/
1711 [68725]: https://github.com/rust-lang/rust/pull/68725/
1712 [68728]: https://github.com/rust-lang/rust/pull/68728/
1713 [68738]: https://github.com/rust-lang/rust/pull/68738/
1714 [68742]: https://github.com/rust-lang/rust/pull/68742/
1715 [68764]: https://github.com/rust-lang/rust/pull/68764/
1716 [68772]: https://github.com/rust-lang/rust/pull/68772/
1717 [68943]: https://github.com/rust-lang/rust/pull/68943/
1718 [68952]: https://github.com/rust-lang/rust/pull/68952/
1719 [68966]: https://github.com/rust-lang/rust/pull/68966/
1720 [68984]: https://github.com/rust-lang/rust/pull/68984/
1721 [69022]: https://github.com/rust-lang/rust/pull/69022/
1722 [69185]: https://github.com/rust-lang/rust/pull/69185/
1723 [69194]: https://github.com/rust-lang/rust/pull/69194/
1724 [69201]: https://github.com/rust-lang/rust/pull/69201/
1725 [69227]: https://github.com/rust-lang/rust/pull/69227/
1726 [69548]: https://github.com/rust-lang/rust/pull/69548/
1727 [69256]: https://github.com/rust-lang/rust/pull/69256/
1728 [69361]: https://github.com/rust-lang/rust/pull/69361/
1729 [69366]: https://github.com/rust-lang/rust/pull/69366/
1730 [69538]: https://github.com/rust-lang/rust/pull/69538/
1731 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1732 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1733 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1734 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1735 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1736 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1737 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1738 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1741 Version 1.42.0 (2020-03-12)
1742 ==========================
1746 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1748 fn foo(words: &[&str]) {
1750 ["Hello", "World", "!", ..] => println!("Hello World!"),
1751 ["Foo", "Bar", ..] => println!("Baz"),
1752 rest => println!("{:?}", rest),
1756 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1757 that you can create an enum that has the exact layout and ABI of the type
1759 - [There are some *syntax-only* changes:][67131]
1760 - `default` is syntactically allowed before items in `trait` definitions.
1761 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1762 leave out their bodies in favor of `;`.
1763 - Bounds on associated types in `impl`s are now syntactically allowed
1764 (e.g. `type Foo: Ord;`).
1765 - `...` (the C-variadic type) may occur syntactically directly as the type of
1766 any function parameter.
1768 These are still rejected *semantically*, so you will likely receive an error
1769 but these changes can be seen and parsed by procedural macros and
1770 conditional compilation.
1774 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1775 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1776 - [`Option::{expect,unwrap}` and
1777 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1778 pointing to the location where they were called, rather than
1779 `core`'s internals. ][67887]
1781 \* Refer to Rust's [platform support page][platform-support-doc] for more
1782 information on Rust's tiered platform support.
1786 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1787 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1788 to implement `Sized`.][67935]
1789 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1790 - [`Layout::new` is now `const`.][66254]
1791 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1796 - [`CondVar::wait_while`]
1797 - [`CondVar::wait_timeout_while`]
1799 - [`DebugMap::value`]
1800 - [`ManuallyDrop::take`]
1802 - [`ptr::slice_from_raw_parts_mut`]
1803 - [`ptr::slice_from_raw_parts`]
1807 - [You no longer need to include `extern crate proc_macro;` to be able to
1808 `use proc_macro;` in the `2018` edition.][cargo/7700]
1812 - [`Error::description` has been deprecated, and its use will now produce a
1813 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1815 [68253]: https://github.com/rust-lang/rust/pull/68253/
1816 [68348]: https://github.com/rust-lang/rust/pull/68348/
1817 [67935]: https://github.com/rust-lang/rust/pull/67935/
1818 [68339]: https://github.com/rust-lang/rust/pull/68339/
1819 [68122]: https://github.com/rust-lang/rust/pull/68122/
1820 [67712]: https://github.com/rust-lang/rust/pull/67712/
1821 [67887]: https://github.com/rust-lang/rust/pull/67887/
1822 [67131]: https://github.com/rust-lang/rust/pull/67131/
1823 [67233]: https://github.com/rust-lang/rust/pull/67233/
1824 [66899]: https://github.com/rust-lang/rust/pull/66899/
1825 [66919]: https://github.com/rust-lang/rust/pull/66919/
1826 [66254]: https://github.com/rust-lang/rust/pull/66254/
1827 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1828 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1829 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1830 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1831 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1832 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1833 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1834 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1835 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1838 Version 1.41.1 (2020-02-27)
1839 ===========================
1841 * [Always check types of static items][69145]
1842 * [Always check lifetime bounds of `Copy` impls][69145]
1843 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1845 [69225]: https://github.com/rust-lang/rust/issues/69225
1846 [69145]: https://github.com/rust-lang/rust/pull/69145
1849 Version 1.41.0 (2020-01-30)
1850 ===========================
1855 - [You can now pass type parameters to foreign items when implementing
1856 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1857 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1858 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1859 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1860 - [You can now use any valid identifier in a `format_args` macro.][66847]
1861 Previously identifiers starting with an underscore were not allowed.
1862 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1863 enum variants.][66183] These are still rejected semantically, but
1864 can be seen and parsed by procedural macros and conditional compilation.
1869 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1870 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1871 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1872 - [You can now pass an arguments file passing the `@path` syntax
1873 to rustc.][66172] Note that the format differs somewhat from what is
1874 found in other tooling; please see [the documentation][argfile-docs] for
1876 - [You can now provide `--extern` flag without a path, indicating that it is
1877 available from the search path or specified with an `-L` flag.][64882]
1879 \* Refer to Rust's [platform support page][platform-support-doc] for more
1880 information on Rust's tiered platform support.
1882 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1887 - [The `core::panic` module is now stable.][66771] It was already stable
1889 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1890 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1891 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1896 - [`Result::map_or`]
1897 - [`Result::map_or_else`]
1898 - [`std::rc::Weak::weak_count`]
1899 - [`std::rc::Weak::strong_count`]
1900 - [`std::sync::Weak::weak_count`]
1901 - [`std::sync::Weak::strong_count`]
1906 - [Cargo will now document all the private items for binary crates
1907 by default.][cargo/7593]
1908 - [`cargo-install` will now reinstall the package if it detects that it is out
1909 of date.][cargo/7560]
1910 - [Cargo.lock now uses a more git friendly format that should help to reduce
1911 merge conflicts.][cargo/7579]
1912 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1913 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1914 optimisation level to `2` for debug builds. You can also use
1915 `[profile.<profile>.build-override]` to override build scripts and
1921 - [You can now specify `edition` in documentation code blocks to compile the block
1922 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1923 should be compiled the 2018 edition of Rust.
1924 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1925 current theme with `--check-theme`.][54733]
1926 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1931 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1932 Apple targets.][apple-32bit-drop] This means that the source code is still
1933 available to build, but the targets are no longer being tested and release
1934 binaries for those platforms will no longer be distributed by the Rust project.
1935 Please refer to the linked blog post for more information.
1937 [54733]: https://github.com/rust-lang/rust/pull/54733/
1938 [61351]: https://github.com/rust-lang/rust/pull/61351/
1939 [67255]: https://github.com/rust-lang/rust/pull/67255/
1940 [66661]: https://github.com/rust-lang/rust/pull/66661/
1941 [66771]: https://github.com/rust-lang/rust/pull/66771/
1942 [66847]: https://github.com/rust-lang/rust/pull/66847/
1943 [66238]: https://github.com/rust-lang/rust/pull/66238/
1944 [66277]: https://github.com/rust-lang/rust/pull/66277/
1945 [66325]: https://github.com/rust-lang/rust/pull/66325/
1946 [66172]: https://github.com/rust-lang/rust/pull/66172/
1947 [66183]: https://github.com/rust-lang/rust/pull/66183/
1948 [65879]: https://github.com/rust-lang/rust/pull/65879/
1949 [65013]: https://github.com/rust-lang/rust/pull/65013/
1950 [64882]: https://github.com/rust-lang/rust/pull/64882/
1951 [64325]: https://github.com/rust-lang/rust/pull/64325/
1952 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1953 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1954 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1955 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1956 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1957 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1958 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1959 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1960 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1961 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1962 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1964 Version 1.40.0 (2019-12-19)
1965 ===========================
1969 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1970 `const` contexts.][65188] e.g.
1973 pub struct Point(i32, i32);
1975 const ORIGIN: Point = {
1976 let constructor = Point;
1982 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1983 indicate that there may be variants or fields added in the future.][64639]
1984 For example this requires adding a wild-card branch (`_ => {}`) to any match
1985 statements on a non-exhaustive `enum`. [(RFC 2008)]
1986 - [You can now use function-like procedural macros in `extern` blocks and in
1987 type positions.][63931] e.g. `type Generated = macro!();`
1988 - [Function-like and attribute procedural macros can now emit
1989 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1990 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1991 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1992 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1996 - [Added tier 3 support\* for the
1997 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1998 - [Added tier 3 support for the
1999 `aarch64-unknown-none-softfloat` target.][64589]
2000 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2001 `mips64el-unknown-linux-muslabi64` targets.][65843]
2003 \* Refer to Rust's [platform support page][platform-support-doc] for more
2004 information on Rust's tiered platform support.
2008 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2012 - [`BTreeMap::get_key_value`]
2013 - [`HashMap::get_key_value`]
2014 - [`Option::as_deref_mut`]
2015 - [`Option::as_deref`]
2016 - [`Option::flatten`]
2017 - [`UdpSocket::peer_addr`]
2018 - [`f32::to_be_bytes`]
2019 - [`f32::to_le_bytes`]
2020 - [`f32::to_ne_bytes`]
2021 - [`f64::to_be_bytes`]
2022 - [`f64::to_le_bytes`]
2023 - [`f64::to_ne_bytes`]
2024 - [`f32::from_be_bytes`]
2025 - [`f32::from_le_bytes`]
2026 - [`f32::from_ne_bytes`]
2027 - [`f64::from_be_bytes`]
2028 - [`f64::from_le_bytes`]
2029 - [`f64::from_ne_bytes`]
2036 - [Cargo will now always display warnings, rather than only on
2037 fresh builds.][cargo/7450]
2038 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2039 now produce an error.][cargo/7507] Previously these flags were ignored.
2040 - [You can now publish `dev-dependencies` without including
2041 a `version`.][cargo/7333]
2045 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2046 when running documentation tests with `rustdoc`.][63803]
2050 - [As previously announced, any previous NLL warnings in the 2015 edition are
2051 now hard errors.][64221]
2052 - [The `include!` macro will now warn if it failed to include the
2053 entire file.][64284] The `include!` macro unintentionally only includes the
2054 first _expression_ in a file, and this can be unintuitive. This will become
2055 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2056 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2057 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2058 or `extern` blocks now correctly emits a hard error.
2060 [65294]: https://github.com/rust-lang/rust/pull/65294/
2061 [66103]: https://github.com/rust-lang/rust/pull/66103/
2062 [65843]: https://github.com/rust-lang/rust/pull/65843/
2063 [65188]: https://github.com/rust-lang/rust/pull/65188/
2064 [65092]: https://github.com/rust-lang/rust/pull/65092/
2065 [64589]: https://github.com/rust-lang/rust/pull/64589/
2066 [64639]: https://github.com/rust-lang/rust/pull/64639/
2067 [64221]: https://github.com/rust-lang/rust/pull/64221/
2068 [64284]: https://github.com/rust-lang/rust/pull/64284/
2069 [63931]: https://github.com/rust-lang/rust/pull/63931/
2070 [64035]: https://github.com/rust-lang/rust/pull/64035/
2071 [63674]: https://github.com/rust-lang/rust/pull/63674/
2072 [63803]: https://github.com/rust-lang/rust/pull/63803/
2073 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2074 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2075 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2076 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2077 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2078 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2079 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2080 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2081 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2082 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2083 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2084 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2085 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2086 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2087 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2088 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2089 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2090 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2091 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2092 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2093 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2094 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2095 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2096 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2097 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2098 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2101 Version 1.39.0 (2019-11-07)
2102 ===========================
2106 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2107 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2108 - [You can now use certain attributes on function, closure, and function pointer
2109 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2110 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2111 attributes applied to items. e.g.
2114 #[cfg(windows)] slice: &[u16],
2115 #[cfg(not(windows))] slice: &[u8],
2120 - [You can now take shared references to bind-by-move patterns in the `if` guards
2121 of `match` arms.][63118] e.g.
2124 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2128 // ---- `nums` is bound by move.
2129 if nums.iter().sum::<u8>() == 10
2130 // ^------ `.iter()` implicitly takes a reference to `nums`.
2133 // ----------- Legal as `nums` was bound by move and so we have ownership.
2135 _ => unreachable!(),
2144 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2145 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2146 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2147 **Note** Cargo currently doesn't use this feature. Refer to
2148 [cargo#7315][cargo/7315] to track this feature's progress.
2149 - [You can now pass `--show-output` argument to test binaries to print the
2150 output of successful tests.][62600]
2153 \* Refer to Rust's [platform support page][platform-support-doc] for more
2154 information on Rust's tiered platform support.
2158 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2159 - [`LinkedList::new` is now a `const` function.][63684]
2160 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2161 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2162 now `const`.][63786]
2166 - [`Pin::into_inner`]
2167 - [`Instant::checked_duration_since`]
2168 - [`Instant::saturating_duration_since`]
2172 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2173 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2174 `--all` is now deprecated.
2178 - [You can now pass `-Clinker` to rustdoc to control the linker used
2179 for compiling doctests.][63834]
2183 - [Code that was previously accepted by the old borrow checker, but rejected by
2184 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2185 previously a warning, and will also become a hard error in the Rust 2015
2186 edition in the 1.40.0 release.
2187 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2188 run tests.][63827] This should improve performance when running a large
2190 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2191 recommended to use the `?` operator instead.
2192 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2195 [62600]: https://github.com/rust-lang/rust/pull/62600/
2196 [62672]: https://github.com/rust-lang/rust/pull/62672/
2197 [63118]: https://github.com/rust-lang/rust/pull/63118/
2198 [63209]: https://github.com/rust-lang/rust/pull/63209/
2199 [63402]: https://github.com/rust-lang/rust/pull/63402/
2200 [63565]: https://github.com/rust-lang/rust/pull/63565/
2201 [63595]: https://github.com/rust-lang/rust/pull/63595/
2202 [63684]: https://github.com/rust-lang/rust/pull/63684/
2203 [63698]: https://github.com/rust-lang/rust/pull/63698/
2204 [63770]: https://github.com/rust-lang/rust/pull/63770/
2205 [63786]: https://github.com/rust-lang/rust/pull/63786/
2206 [63827]: https://github.com/rust-lang/rust/pull/63827/
2207 [63834]: https://github.com/rust-lang/rust/pull/63834/
2208 [63927]: https://github.com/rust-lang/rust/pull/63927/
2209 [63933]: https://github.com/rust-lang/rust/pull/63933/
2210 [63934]: https://github.com/rust-lang/rust/pull/63934/
2211 [63938]: https://github.com/rust-lang/rust/pull/63938/
2212 [63940]: https://github.com/rust-lang/rust/pull/63940/
2213 [63941]: https://github.com/rust-lang/rust/pull/63941/
2214 [63945]: https://github.com/rust-lang/rust/pull/63945/
2215 [64010]: https://github.com/rust-lang/rust/pull/64010/
2216 [64028]: https://github.com/rust-lang/rust/pull/64028/
2217 [64334]: https://github.com/rust-lang/rust/pull/64334/
2218 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2219 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2220 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2221 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2222 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2223 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2225 Version 1.38.0 (2019-09-26)
2226 ==========================
2230 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2231 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2235 - [Added pipelined compilation support to `rustc`.][62766] This will
2236 improve compilation times in some cases. For further information please refer
2237 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2238 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2239 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2240 `x86_64-uwp-windows-msvc` targets.][60260]
2241 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2242 `armv7-unknown-linux-musleabi` targets.][63107]
2243 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2244 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2245 - [Upgraded to LLVM 9.][62592]
2247 \* Refer to Rust's [platform support page][platform-support-doc] for more
2248 information on Rust's tiered platform support.
2252 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2253 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2254 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2255 is available at `std::clone::Clone`). This also makes all built-in macros
2256 available in `std`/`core` root. e.g. `std::include_bytes!`.
2257 - [`str::Chars` now implements `Debug`.][63000]
2258 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2259 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2260 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2261 - [Added euclidean remainder and division operations (`div_euclid`,
2262 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2263 `overflowing`, and `wrapping` versions are available for all
2265 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2266 `PartialEq`.][61491]
2267 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2271 - [`<*const T>::cast`]
2272 - [`<*mut T>::cast`]
2273 - [`Duration::as_secs_f32`]
2274 - [`Duration::as_secs_f64`]
2275 - [`Duration::div_f32`]
2276 - [`Duration::div_f64`]
2277 - [`Duration::from_secs_f32`]
2278 - [`Duration::from_secs_f64`]
2279 - [`Duration::mul_f32`]
2280 - [`Duration::mul_f64`]
2281 - [`any::type_name`]
2285 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2286 - [You can now pass the `--features` option multiple times to enable
2287 multiple features.][cargo/7084]
2292 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2296 - [`rustc` will now warn about some incorrect uses of
2297 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2301 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2303 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2304 issues][62896] with certain crates such as libc.
2306 [60260]: https://github.com/rust-lang/rust/pull/60260/
2307 [61457]: https://github.com/rust-lang/rust/pull/61457/
2308 [61491]: https://github.com/rust-lang/rust/pull/61491/
2309 [61884]: https://github.com/rust-lang/rust/pull/61884/
2310 [61953]: https://github.com/rust-lang/rust/pull/61953/
2311 [62042]: https://github.com/rust-lang/rust/pull/62042/
2312 [62528]: https://github.com/rust-lang/rust/pull/62528/
2313 [62583]: https://github.com/rust-lang/rust/pull/62583/
2314 [62735]: https://github.com/rust-lang/rust/pull/62735/
2315 [62766]: https://github.com/rust-lang/rust/pull/62766/
2316 [62784]: https://github.com/rust-lang/rust/pull/62784/
2317 [62592]: https://github.com/rust-lang/rust/pull/62592/
2318 [62785]: https://github.com/rust-lang/rust/issues/62785/
2319 [62814]: https://github.com/rust-lang/rust/pull/62814/
2320 [62896]: https://github.com/rust-lang/rust/issues/62896/
2321 [63000]: https://github.com/rust-lang/rust/pull/63000/
2322 [63056]: https://github.com/rust-lang/rust/pull/63056/
2323 [63107]: https://github.com/rust-lang/rust/pull/63107/
2324 [63346]: https://github.com/rust-lang/rust/pull/63346/
2325 [63421]: https://github.com/rust-lang/rust/pull/63421/
2326 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2327 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2328 [63048]: https://github.com/rust-lang/rust/pull/63048
2329 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2330 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2331 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2332 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2333 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2334 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2335 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2336 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2337 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2338 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2339 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2340 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2341 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2343 Version 1.37.0 (2019-08-15)
2344 ==========================
2348 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2349 [`Box`][62228], or an [array][62235] and unused.
2350 - [You can now use the `cfg` and `cfg_attr` attributes on
2351 generic parameters.][61547]
2352 - [You can now use enum variants through type alias.][61682] e.g. You can
2353 write the following:
2355 type MyOption = Option<u8>;
2357 fn increment_or_zero(x: MyOption) -> u8 {
2359 MyOption::Some(y) => y + 1,
2360 MyOption::None => 0,
2364 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2365 `const _: u32 = 5;`.
2366 - [You can now use `#[repr(align(X)]` on enums.][61229]
2367 - [The `?` Kleene macro operator is now available in the
2368 2015 edition.][60932]
2372 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2373 and `-C profile-use` flags.][61268] For more information on how to use profile
2374 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2375 - [The `rust-lldb` wrapper script should now work again.][61827]
2379 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2383 - [`BufReader::buffer`]
2384 - [`BufWriter::buffer`]
2385 - [`Cell::from_mut`]
2386 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2387 - [`DoubleEndedIterator::nth_back`]
2389 - [`Wrapping::reverse_bits`]
2390 - [`i128::reverse_bits`]
2391 - [`i16::reverse_bits`]
2392 - [`i32::reverse_bits`]
2393 - [`i64::reverse_bits`]
2394 - [`i8::reverse_bits`]
2395 - [`isize::reverse_bits`]
2396 - [`slice::copy_within`]
2397 - [`u128::reverse_bits`]
2398 - [`u16::reverse_bits`]
2399 - [`u32::reverse_bits`]
2400 - [`u64::reverse_bits`]
2401 - [`u8::reverse_bits`]
2402 - [`usize::reverse_bits`]
2406 - [`Cargo.lock` files are now included by default when publishing executable crates
2407 with executables.][cargo/7026]
2408 - [You can now specify `default-run="foo"` in `[package]` to specify the
2409 default executable to use for `cargo run`.][cargo/7056]
2416 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2417 Please transition your code to using the `..=` syntax for inclusive
2419 - [Using a trait object without the `dyn` will now warn by default.][61203]
2420 Please transition your code to use `dyn Trait` for trait objects instead.
2422 [62228]: https://github.com/rust-lang/rust/pull/62228/
2423 [62235]: https://github.com/rust-lang/rust/pull/62235/
2424 [61802]: https://github.com/rust-lang/rust/pull/61802/
2425 [61827]: https://github.com/rust-lang/rust/pull/61827/
2426 [61547]: https://github.com/rust-lang/rust/pull/61547/
2427 [61682]: https://github.com/rust-lang/rust/pull/61682/
2428 [61268]: https://github.com/rust-lang/rust/pull/61268/
2429 [61342]: https://github.com/rust-lang/rust/pull/61342/
2430 [61347]: https://github.com/rust-lang/rust/pull/61347/
2431 [61100]: https://github.com/rust-lang/rust/pull/61100/
2432 [61203]: https://github.com/rust-lang/rust/pull/61203/
2433 [61229]: https://github.com/rust-lang/rust/pull/61229/
2434 [60932]: https://github.com/rust-lang/rust/pull/60932/
2435 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2436 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2437 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2438 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2439 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2440 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2441 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2442 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2443 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2444 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2445 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2446 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2447 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2448 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2449 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2450 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2451 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2452 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2453 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2454 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2455 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2456 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2457 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2458 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2461 Version 1.36.0 (2019-07-04)
2462 ==========================
2466 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2467 - [The order of traits in trait objects no longer affects the semantics of that
2468 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2469 `dyn fmt::Debug + Send`, where this was previously not the case.
2473 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2474 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2475 - [`mem::needs_drop` is now available as a const fn.][60364]
2476 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2477 - [`String` now implements `BorrowMut<str>`.][60404]
2478 - [`io::Cursor` now implements `Default`.][60234]
2479 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2480 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2481 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2482 environment has access to heap memory allocation.
2483 - [`String` now implements `From<&String>`.][59825]
2484 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2485 return a tuple of each argument when there is multiple arguments.
2486 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2491 - [`VecDeque::rotate_left`]
2492 - [`VecDeque::rotate_right`]
2493 - [`Iterator::copied`]
2495 - [`io::IoSliceMut`]
2496 - [`Read::read_vectored`]
2497 - [`Write::write_vectored`]
2498 - [`str::as_mut_ptr`]
2499 - [`mem::MaybeUninit`]
2500 - [`pointer::align_offset`]
2501 - [`future::Future`]
2503 - [`task::RawWaker`]
2504 - [`task::RawWakerVTable`]
2510 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2511 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2513 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2517 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2524 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2525 longer recommended, and will be deprecated in 1.39.0.
2527 [60318]: https://github.com/rust-lang/rust/pull/60318/
2528 [60364]: https://github.com/rust-lang/rust/pull/60364/
2529 [60370]: https://github.com/rust-lang/rust/pull/60370/
2530 [60404]: https://github.com/rust-lang/rust/pull/60404/
2531 [60234]: https://github.com/rust-lang/rust/pull/60234/
2532 [60244]: https://github.com/rust-lang/rust/pull/60244/
2533 [58623]: https://github.com/rust-lang/rust/pull/58623/
2534 [59648]: https://github.com/rust-lang/rust/pull/59648/
2535 [59675]: https://github.com/rust-lang/rust/pull/59675/
2536 [59825]: https://github.com/rust-lang/rust/pull/59825/
2537 [59826]: https://github.com/rust-lang/rust/pull/59826/
2538 [59445]: https://github.com/rust-lang/rust/pull/59445/
2539 [59114]: https://github.com/rust-lang/rust/pull/59114/
2540 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2541 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2542 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2543 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2544 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2545 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2546 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2547 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2548 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2549 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2550 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2551 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2552 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2553 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2554 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2555 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2556 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2557 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2558 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2559 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2562 Version 1.35.0 (2019-05-23)
2563 ==========================
2567 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2568 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2569 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2571 unsafe fn call_unsafe(func: unsafe fn()) {
2576 unsafe { call_unsafe(|| {}); }
2583 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2584 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2585 - [Added the `wasm32-unknown-wasi` target.][59464]
2590 - [`Thread` will now show its ID in `Debug` output.][59460]
2591 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2592 - [`alloc::System` now implements `Default`.][59451]
2593 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2595 - [`char::{ToLowercase, ToUppercase}` now
2596 implement `ExactSizeIterator`.][58778]
2597 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2598 - [Removed the `Read` trait bounds
2599 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2600 - [You can now call the `dbg!` macro without any parameters to print the file
2601 and line where it is called.][57847]
2602 - [In place ASCII case conversions are now up to 4× faster.][59283]
2603 e.g. `str::make_ascii_lowercase`
2604 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2611 - [`RefCell::replace_with`]
2612 - [`RefCell::map_split`]
2614 - [`Range::contains`]
2615 - [`RangeFrom::contains`]
2616 - [`RangeTo::contains`]
2617 - [`RangeInclusive::contains`]
2618 - [`RangeToInclusive::contains`]
2619 - [`Option::copied`]
2623 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2624 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2629 - [The Rust toolchain is now available natively for musl based distros.][58575]
2631 [59460]: https://github.com/rust-lang/rust/pull/59460/
2632 [59464]: https://github.com/rust-lang/rust/pull/59464/
2633 [59500]: https://github.com/rust-lang/rust/pull/59500/
2634 [59512]: https://github.com/rust-lang/rust/pull/59512/
2635 [59580]: https://github.com/rust-lang/rust/pull/59580/
2636 [59283]: https://github.com/rust-lang/rust/pull/59283/
2637 [59451]: https://github.com/rust-lang/rust/pull/59451/
2638 [59076]: https://github.com/rust-lang/rust/pull/59076/
2639 [58778]: https://github.com/rust-lang/rust/pull/58778/
2640 [58717]: https://github.com/rust-lang/rust/pull/58717/
2641 [58369]: https://github.com/rust-lang/rust/pull/58369/
2642 [58423]: https://github.com/rust-lang/rust/pull/58423/
2643 [58080]: https://github.com/rust-lang/rust/pull/58080/
2644 [57847]: https://github.com/rust-lang/rust/pull/57847/
2645 [58575]: https://github.com/rust-lang/rust/pull/58575
2646 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2647 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2648 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2649 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2650 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2651 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2652 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2653 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2654 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2655 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2656 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2657 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2659 Version 1.34.2 (2019-05-14)
2660 ===========================
2662 * [Destabilize the `Error::type_id` function due to a security
2663 vulnerability][60785] ([CVE-2019-12083])
2665 [60785]: https://github.com/rust-lang/rust/pull/60785
2666 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2668 Version 1.34.1 (2019-04-25)
2669 ===========================
2671 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2672 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2673 * [Fix Clippy panic when checking some macros][clippy/3805]
2675 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2676 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2677 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2679 Version 1.34.0 (2019-04-11)
2680 ==========================
2684 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2685 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2687 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2688 `#[attr{}]` procedural macros.][57367]
2689 - [You can now write `extern crate self as foo;`][57407] to import your
2690 crate's root into the extern prelude.
2695 - [You can now target `riscv64imac-unknown-none-elf` and
2696 `riscv64gc-unknown-none-elf`.][58406]
2697 - [You can now enable linker plugin LTO optimisations with
2698 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2699 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2701 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2706 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2707 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2708 the `Hash` trait to create an iterator.
2709 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2710 methods.][58421] Most notably you no longer require the `Ord` trait to create
2712 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2713 for all numeric types.][58044]
2714 - [Indexing a `str` is now generic over all types that
2715 implement `SliceIndex<str>`.][57604]
2716 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2717 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2718 produce a warning if their returning type is unused.
2719 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2720 `overflowing_pow` are now available for all numeric types.][57873] These are
2721 equivalent to methods such as `wrapping_add` for the `pow` operation.
2729 * [`Error::type_id`]
2730 * [`atomic::AtomicI16`]
2731 * [`atomic::AtomicI32`]
2732 * [`atomic::AtomicI64`]
2733 * [`atomic::AtomicI8`]
2734 * [`atomic::AtomicU16`]
2735 * [`atomic::AtomicU32`]
2736 * [`atomic::AtomicU64`]
2737 * [`atomic::AtomicU8`]
2738 * [`convert::Infallible`]
2739 * [`convert::TryFrom`]
2740 * [`convert::TryInto`]
2742 * [`iter::successors`]
2743 * [`num::NonZeroI128`]
2744 * [`num::NonZeroI16`]
2745 * [`num::NonZeroI32`]
2746 * [`num::NonZeroI64`]
2747 * [`num::NonZeroI8`]
2748 * [`num::NonZeroIsize`]
2749 * [`slice::sort_by_cached_key`]
2750 * [`str::escape_debug`]
2751 * [`str::escape_default`]
2752 * [`str::escape_unicode`]
2753 * [`str::split_ascii_whitespace`]
2756 * [`Instant::checked_add`]
2757 * [`Instant::checked_sub`]
2758 * [`SystemTime::checked_add`]
2759 * [`SystemTime::checked_sub`]
2763 - [You can now use alternative registries to crates.io.][cargo/6654]
2767 - [You can now use the `?` operator in your documentation tests without manually
2768 adding `fn main() -> Result<(), _> {}`.][56470]
2772 - [`Command::before_exec` is being replaced by the unsafe method
2773 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2774 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2775 can now use `const` functions in `static` variables.
2777 [58370]: https://github.com/rust-lang/rust/pull/58370/
2778 [58406]: https://github.com/rust-lang/rust/pull/58406/
2779 [58421]: https://github.com/rust-lang/rust/pull/58421/
2780 [58166]: https://github.com/rust-lang/rust/pull/58166/
2781 [58044]: https://github.com/rust-lang/rust/pull/58044/
2782 [58057]: https://github.com/rust-lang/rust/pull/58057/
2783 [58059]: https://github.com/rust-lang/rust/pull/58059/
2784 [57809]: https://github.com/rust-lang/rust/pull/57809/
2785 [57873]: https://github.com/rust-lang/rust/pull/57873/
2786 [57604]: https://github.com/rust-lang/rust/pull/57604/
2787 [57367]: https://github.com/rust-lang/rust/pull/57367/
2788 [57407]: https://github.com/rust-lang/rust/pull/57407/
2789 [57425]: https://github.com/rust-lang/rust/pull/57425/
2790 [57106]: https://github.com/rust-lang/rust/pull/57106/
2791 [56470]: https://github.com/rust-lang/rust/pull/56470/
2792 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2793 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2794 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2795 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2796 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2797 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2798 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2799 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2800 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2801 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2802 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2803 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2804 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2805 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2806 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2807 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2808 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2809 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2810 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2811 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2812 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2813 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2814 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2815 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2816 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2817 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2818 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2819 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2820 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2821 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2822 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2825 Version 1.33.0 (2019-02-28)
2826 ==========================
2830 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2831 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2832 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2833 E.g. You can have match statement on a `u8` that covers `0..=255` and
2834 you would no longer be required to have a `_ => unreachable!()` case.
2835 - [You can now have multiple patterns in `if let` and `while let`
2836 expressions.][57532] You can do this with the same syntax as a `match`
2846 let state = Creature::Crab("Ferris");
2848 if let Creature::Crab(name) | Creature::Person(name) = state {
2849 println!("This creature's name is: {}", name);
2853 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2854 this feature will by default produce a warning as this behaviour can be
2855 unintuitive. E.g. `if let _ = 5 {}`
2856 - [You can now use `let` bindings, assignments, expression statements,
2857 and irrefutable pattern destructuring in const functions.][57175]
2858 - [You can now call unsafe const functions.][57067] E.g.
2860 const unsafe fn foo() -> i32 { 5 }
2861 const fn bar() -> i32 {
2865 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2866 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2867 - [You can now specify a specific alignment with the `#[repr(packed)]`
2868 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2869 with an alignment of 2 bytes and a size of 6 bytes.
2870 - [You can now import an item from a module as an `_`.][56303] This allows you to
2871 import a trait's impls, and not have the name in the namespace. E.g.
2873 use std::io::Read as _;
2875 // Allowed as there is only one `Read` in the module.
2878 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2882 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2883 command line argument.][56351]
2884 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2885 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2886 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2887 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2888 information on Rust's platform support.
2889 - [Added support for the `thumbv7neon-linux-androideabi` and
2890 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2891 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2895 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2896 functions for all numeric types.][57566]
2897 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2898 are now `const` functions for all numeric types.][57105]
2899 - [The methods `is_positive` and `is_negative` are now `const` functions for
2900 all signed numeric types.][57105]
2901 - [The `get` method for all `NonZero` types is now `const`.][57167]
2902 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2903 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2904 numeric types.][57234]
2905 - [`Ipv4Addr::new` is now a `const` function][57234]
2909 - [`unix::FileExt::read_exact_at`]
2910 - [`unix::FileExt::write_all_at`]
2911 - [`Option::transpose`]
2912 - [`Result::transpose`]
2913 - [`convert::identity`]
2916 - [`marker::PhantomPinned`]
2917 - [`Vec::resize_with`]
2918 - [`VecDeque::resize_with`]
2919 - [`Duration::as_millis`]
2920 - [`Duration::as_micros`]
2921 - [`Duration::as_nanos`]
2926 - [You can now publish crates that require a feature flag to compile with
2927 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2928 - [Cargo should now rebuild a crate if a file was modified during the initial
2933 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2934 are now deprecated in the standard library, and their usage will now produce a warning.
2935 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2937 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2939 - [Libtest no longer creates a new thread for each test when
2940 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2942 [55982]: https://github.com/rust-lang/rust/pull/55982/
2943 [56243]: https://github.com/rust-lang/rust/pull/56243
2944 [56303]: https://github.com/rust-lang/rust/pull/56303/
2945 [56351]: https://github.com/rust-lang/rust/pull/56351/
2946 [56362]: https://github.com/rust-lang/rust/pull/56362
2947 [56642]: https://github.com/rust-lang/rust/pull/56642/
2948 [56769]: https://github.com/rust-lang/rust/pull/56769/
2949 [56805]: https://github.com/rust-lang/rust/pull/56805
2950 [56947]: https://github.com/rust-lang/rust/pull/56947/
2951 [57049]: https://github.com/rust-lang/rust/pull/57049/
2952 [57067]: https://github.com/rust-lang/rust/pull/57067/
2953 [57105]: https://github.com/rust-lang/rust/pull/57105
2954 [57130]: https://github.com/rust-lang/rust/pull/57130/
2955 [57167]: https://github.com/rust-lang/rust/pull/57167/
2956 [57175]: https://github.com/rust-lang/rust/pull/57175/
2957 [57234]: https://github.com/rust-lang/rust/pull/57234/
2958 [57332]: https://github.com/rust-lang/rust/pull/57332/
2959 [57465]: https://github.com/rust-lang/rust/pull/57465/
2960 [57532]: https://github.com/rust-lang/rust/pull/57532/
2961 [57535]: https://github.com/rust-lang/rust/pull/57535/
2962 [57566]: https://github.com/rust-lang/rust/pull/57566/
2963 [57615]: https://github.com/rust-lang/rust/pull/57615/
2964 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2965 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2966 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2967 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2968 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2969 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2970 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2971 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2972 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2973 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2974 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2975 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2976 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2977 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2978 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2979 [platform-support]: https://forge.rust-lang.org/platform-support.html
2981 Version 1.32.0 (2019-01-17)
2982 ==========================
2987 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2988 operator allows you to specify zero or one repetitions similar to the `*` and
2990 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2991 now always resolve to the item (`enum`, `struct`, etc.) available in the
2992 module if present, before resolving to a external crate or an item the prelude.][56759]
2995 enum Color { Red, Green, Blue }
3001 - [You can now match against `PhantomData<T>` types.][55837]
3002 - [You can now match against literals in macros with the `literal`
3003 specifier.][56072] This will match against a literal of any type.
3004 E.g. `1`, `'A'`, `"Hello World"`
3005 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3007 struct Point(i32, i32);
3010 pub fn new(x: i32, y: i32) -> Self {
3014 pub fn is_origin(&self) -> bool {
3022 - [Self can also now be used in type definitions.][56366] E.g.
3026 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3029 Cons(T, Box<Self>) // likewise here
3032 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3033 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3037 - [The default allocator has changed from jemalloc to the default allocator on
3038 your system.][55238] The compiler itself on Linux & macOS will still use
3039 jemalloc, but programs compiled with it will use the system allocator.
3040 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3044 - [`PathBuf` now implements `FromStr`.][55148]
3045 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3046 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3047 easily debug expressions in your rust program. E.g.
3050 let b = dbg!(a * 2) + 1;
3051 // ^-- prints: [src/main.rs:4] a * 2 = 4
3055 The following APIs are now `const` functions and can be used in a
3059 - [`UnsafeCell::get`]
3060 - [`char::is_ascii`]
3062 - [`ManuallyDrop::new`]
3063 - [`ManuallyDrop::into_inner`]
3064 - [`RangeInclusive::start`]
3065 - [`RangeInclusive::end`]
3066 - [`NonNull::as_ptr`]
3069 - [`Duration::as_secs`]
3070 - [`Duration::subsec_millis`]
3071 - [`Duration::subsec_micros`]
3072 - [`Duration::subsec_nanos`]
3074 - [`Ipv4Addr::is_unspecified`]
3076 - [`Ipv6Addr::octets`]
3080 - [`i8::to_be_bytes`]
3081 - [`i8::to_le_bytes`]
3082 - [`i8::to_ne_bytes`]
3083 - [`i8::from_be_bytes`]
3084 - [`i8::from_le_bytes`]
3085 - [`i8::from_ne_bytes`]
3086 - [`i16::to_be_bytes`]
3087 - [`i16::to_le_bytes`]
3088 - [`i16::to_ne_bytes`]
3089 - [`i16::from_be_bytes`]
3090 - [`i16::from_le_bytes`]
3091 - [`i16::from_ne_bytes`]
3092 - [`i32::to_be_bytes`]
3093 - [`i32::to_le_bytes`]
3094 - [`i32::to_ne_bytes`]
3095 - [`i32::from_be_bytes`]
3096 - [`i32::from_le_bytes`]
3097 - [`i32::from_ne_bytes`]
3098 - [`i64::to_be_bytes`]
3099 - [`i64::to_le_bytes`]
3100 - [`i64::to_ne_bytes`]
3101 - [`i64::from_be_bytes`]
3102 - [`i64::from_le_bytes`]
3103 - [`i64::from_ne_bytes`]
3104 - [`i128::to_be_bytes`]
3105 - [`i128::to_le_bytes`]
3106 - [`i128::to_ne_bytes`]
3107 - [`i128::from_be_bytes`]
3108 - [`i128::from_le_bytes`]
3109 - [`i128::from_ne_bytes`]
3110 - [`isize::to_be_bytes`]
3111 - [`isize::to_le_bytes`]
3112 - [`isize::to_ne_bytes`]
3113 - [`isize::from_be_bytes`]
3114 - [`isize::from_le_bytes`]
3115 - [`isize::from_ne_bytes`]
3116 - [`u8::to_be_bytes`]
3117 - [`u8::to_le_bytes`]
3118 - [`u8::to_ne_bytes`]
3119 - [`u8::from_be_bytes`]
3120 - [`u8::from_le_bytes`]
3121 - [`u8::from_ne_bytes`]
3122 - [`u16::to_be_bytes`]
3123 - [`u16::to_le_bytes`]
3124 - [`u16::to_ne_bytes`]
3125 - [`u16::from_be_bytes`]
3126 - [`u16::from_le_bytes`]
3127 - [`u16::from_ne_bytes`]
3128 - [`u32::to_be_bytes`]
3129 - [`u32::to_le_bytes`]
3130 - [`u32::to_ne_bytes`]
3131 - [`u32::from_be_bytes`]
3132 - [`u32::from_le_bytes`]
3133 - [`u32::from_ne_bytes`]
3134 - [`u64::to_be_bytes`]
3135 - [`u64::to_le_bytes`]
3136 - [`u64::to_ne_bytes`]
3137 - [`u64::from_be_bytes`]
3138 - [`u64::from_le_bytes`]
3139 - [`u64::from_ne_bytes`]
3140 - [`u128::to_be_bytes`]
3141 - [`u128::to_le_bytes`]
3142 - [`u128::to_ne_bytes`]
3143 - [`u128::from_be_bytes`]
3144 - [`u128::from_le_bytes`]
3145 - [`u128::from_ne_bytes`]
3146 - [`usize::to_be_bytes`]
3147 - [`usize::to_le_bytes`]
3148 - [`usize::to_ne_bytes`]
3149 - [`usize::from_be_bytes`]
3150 - [`usize::from_le_bytes`]
3151 - [`usize::from_ne_bytes`]
3155 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3156 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3160 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3164 - [The argument types for AVX's
3165 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3166 been changed from `*const` to `*mut` as the previous implementation
3170 [55148]: https://github.com/rust-lang/rust/pull/55148/
3171 [55238]: https://github.com/rust-lang/rust/pull/55238/
3172 [55280]: https://github.com/rust-lang/rust/pull/55280/
3173 [55610]: https://github.com/rust-lang/rust/pull/55610/
3174 [55663]: https://github.com/rust-lang/rust/pull/55663/
3175 [55702]: https://github.com/rust-lang/rust/pull/55702/
3176 [55837]: https://github.com/rust-lang/rust/pull/55837/
3177 [55843]: https://github.com/rust-lang/rust/pull/55843/
3178 [56072]: https://github.com/rust-lang/rust/pull/56072/
3179 [56245]: https://github.com/rust-lang/rust/pull/56245/
3180 [56365]: https://github.com/rust-lang/rust/pull/56365/
3181 [56366]: https://github.com/rust-lang/rust/pull/56366/
3182 [56395]: https://github.com/rust-lang/rust/pull/56395/
3183 [56759]: https://github.com/rust-lang/rust/pull/56759/
3184 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3185 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3186 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3187 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3188 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3189 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3190 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3191 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3192 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3193 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3194 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3195 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3196 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3197 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3198 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3199 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3200 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3201 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3202 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3203 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3204 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3205 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3206 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3207 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3208 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3209 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3210 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3211 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3212 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3213 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3214 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3215 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3216 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3217 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3218 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3219 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3220 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3221 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3222 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3223 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3224 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3225 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3226 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3227 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3228 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3229 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3230 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3231 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3232 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3233 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3234 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3235 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3236 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3237 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3238 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3239 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3240 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3241 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3242 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3243 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3244 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3245 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3246 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3247 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3248 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3249 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3250 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3251 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3252 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3253 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3254 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3255 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3256 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3257 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3258 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3259 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3260 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3261 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3262 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3263 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3264 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3265 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3266 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3267 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3268 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3269 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3270 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3271 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3272 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3273 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3274 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3275 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3276 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3279 Version 1.31.1 (2018-12-20)
3280 ===========================
3282 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3283 - [Fix broken go-to-definition in RLS][rls/1171]
3284 - [Fix infinite loop on hover in RLS][rls/1170]
3286 [56562]: https://github.com/rust-lang/rust/pull/56562
3287 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3288 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3290 Version 1.31.0 (2018-12-06)
3291 ==========================
3295 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3296 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3297 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3298 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3300 - [You can now define and use `const` functions.][54835] These are currently
3301 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3302 [language reference][const-reference] for what exactly is available.
3303 - [You can now use tool lints, which allow you to scope lints from external
3304 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3305 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3306 a crate, not just in exported functions.][54451]
3307 - [You can now use parentheses in pattern matches.][54497]
3311 - [Updated musl to 1.1.20][54430]
3315 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3316 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3317 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3318 into `Option<&mut T>` using the `From` trait.][53218]
3319 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3324 - [`slice::align_to`]
3325 - [`slice::align_to_mut`]
3326 - [`slice::chunks_exact`]
3327 - [`slice::chunks_exact_mut`]
3328 - [`slice::rchunks`]
3329 - [`slice::rchunks_mut`]
3330 - [`slice::rchunks_exact`]
3331 - [`slice::rchunks_exact_mut`]
3332 - [`Option::replace`]
3336 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3337 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3338 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3340 [52813]: https://github.com/rust-lang/rust/pull/52813/
3341 [53218]: https://github.com/rust-lang/rust/pull/53218/
3342 [53555]: https://github.com/rust-lang/rust/issues/53555/
3343 [54057]: https://github.com/rust-lang/rust/pull/54057/
3344 [54240]: https://github.com/rust-lang/rust/pull/54240/
3345 [54430]: https://github.com/rust-lang/rust/pull/54430/
3346 [54451]: https://github.com/rust-lang/rust/pull/54451/
3347 [54497]: https://github.com/rust-lang/rust/pull/54497/
3348 [54778]: https://github.com/rust-lang/rust/pull/54778/
3349 [54835]: https://github.com/rust-lang/rust/pull/54835/
3350 [54870]: https://github.com/rust-lang/rust/pull/54870/
3351 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3352 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3353 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3354 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3355 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3356 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3357 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3358 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3359 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3360 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3361 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3362 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3363 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3364 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3366 Version 1.30.1 (2018-11-08)
3367 ===========================
3369 - [Fixed overflow ICE in rustdoc][54199]
3370 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3372 [54199]: https://github.com/rust-lang/rust/pull/54199
3373 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3375 Version 1.30.0 (2018-10-25)
3376 ==========================
3380 - [Procedural macros are now available.][52081] These kinds of macros allow for
3381 more powerful code generation. There is a [new chapter available][proc-macros]
3382 in the Rust Programming Language book that goes further in depth.
3383 - [You can now use keywords as identifiers using the raw identifiers
3384 syntax (`r#`),][53236] e.g. `let r#for = true;`
3385 - [Using anonymous parameters in traits is now deprecated with a warning and
3386 will be a hard error in the 2018 edition.][53272]
3387 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3388 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3389 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3390 Previously, using a external crate in a module without a use statement
3391 required `let json = ::serde_json::from_str(foo);` but can now be written
3392 as `let json = serde_json::from_str(foo);`.
3393 - [You can now apply the `#[used]` attribute to static items to prevent the
3394 compiler from optimising them away, even if they appear to be unused,][51363]
3395 e.g. `#[used] static FOO: u32 = 1;`
3396 - [You can now import and reexport macros from other crates with the `use`
3397 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3398 the root module of the crate. If your macro relies on calling other local
3399 macros, it is recommended to export with the
3400 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3402 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3403 using the `vis` specifier.][53370]
3404 - [Non-macro attributes now allow all forms of literals, not just
3405 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3406 write `#[attr(true)]`.
3407 - [You can now specify a function to handle a panic in the Rust runtime with the
3408 `#[panic_handler]` attribute.][51366]
3412 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3413 - [Added the `aarch64-unknown-netbsd` target][53165]
3414 - [Upgraded to LLVM 8.][53611]
3418 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3422 - [`Ipv4Addr::BROADCAST`]
3423 - [`Ipv4Addr::LOCALHOST`]
3424 - [`Ipv4Addr::UNSPECIFIED`]
3425 - [`Ipv6Addr::LOCALHOST`]
3426 - [`Ipv6Addr::UNSPECIFIED`]
3427 - [`Iterator::find_map`]
3429 The following methods are replacement methods for `trim_left`, `trim_right`,
3430 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3432 - [`str::trim_end_matches`]
3434 - [`str::trim_start_matches`]
3435 - [`str::trim_start`]
3439 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3440 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3441 equivalent to calling `rustdoc --error-format=json`.
3442 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3446 - [`rustdoc` allows you to specify what edition to treat your code as with the
3447 `--edition` option.][54057]
3448 - [`rustdoc` now has the `--color` (specify whether to output color) and
3449 `--error-format` (specify error format, e.g. `json`) options.][53003]
3450 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3451 debug symbols.][53774]
3452 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3453 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3455 [50911]: https://github.com/rust-lang/rust/pull/50911/
3456 [51363]: https://github.com/rust-lang/rust/pull/51363/
3457 [51366]: https://github.com/rust-lang/rust/pull/51366/
3458 [52081]: https://github.com/rust-lang/rust/pull/52081/
3459 [53003]: https://github.com/rust-lang/rust/pull/53003/
3460 [53033]: https://github.com/rust-lang/rust/pull/53033/
3461 [53044]: https://github.com/rust-lang/rust/pull/53044/
3462 [53165]: https://github.com/rust-lang/rust/pull/53165/
3463 [53611]: https://github.com/rust-lang/rust/pull/53611/
3464 [53213]: https://github.com/rust-lang/rust/pull/53213/
3465 [53236]: https://github.com/rust-lang/rust/pull/53236/
3466 [53272]: https://github.com/rust-lang/rust/pull/53272/
3467 [53370]: https://github.com/rust-lang/rust/pull/53370/
3468 [53459]: https://github.com/rust-lang/rust/pull/53459/
3469 [53774]: https://github.com/rust-lang/rust/pull/53774/
3470 [53822]: https://github.com/rust-lang/rust/pull/53822/
3471 [54057]: https://github.com/rust-lang/rust/pull/54057/
3472 [54146]: https://github.com/rust-lang/rust/pull/54146/
3473 [54404]: https://github.com/rust-lang/rust/pull/54404/
3474 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3475 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3476 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3477 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3479 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3480 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3481 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3482 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3483 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3484 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3485 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3486 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3487 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3488 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3491 Version 1.29.2 (2018-10-11)
3492 ===========================
3494 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3495 - The `rls-preview` component on the windows-gnu targets has been restored.
3497 [54639]: https://github.com/rust-lang/rust/pull/54639
3500 Version 1.29.1 (2018-09-25)
3501 ===========================
3506 - The standard library's `str::repeat` function contained an out of bounds write
3507 caused by an integer overflow. This has been fixed by deterministically
3508 panicking when an overflow happens.
3510 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3514 Version 1.29.0 (2018-09-13)
3515 ==========================
3519 - [Bumped minimum LLVM version to 5.0.][51899]
3520 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3521 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3522 - [Upgraded to LLVM 7.][51966]
3526 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3527 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3528 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3529 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3531 - [`Cell<T>` now allows `T` to be unsized.][50494]
3532 - [`SocketAddr` is now stable on Redox.][52656]
3537 - [`Iterator::flatten`]
3542 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3543 `--locked` to disable this behavior.
3544 - [`cargo-install` will now allow you to cross compile an install
3545 using `--target`.][cargo/5614]
3546 - [Added the `cargo-fix` subcommand to automatically move project code from
3547 2015 edition to 2018.][cargo/5723]
3548 - [`cargo doc` can now optionally document private types using the
3549 `--document-private-items` flag.][cargo/5543]
3553 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3554 the specified level to that level.][52354] For example `--cap-lints warn`
3555 will demote `deny` and `forbid` lints to `warn`.
3556 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3557 fails and `101` if there is a panic.][52197]
3558 - [A preview of clippy has been made available through rustup.][51122]
3559 You can install the preview with `rustup component add clippy-preview`.
3563 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3564 Use `str::get_unchecked(begin..end)` instead.
3565 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3566 Consider using the `home_dir` function from
3567 https://crates.io/crates/dirs instead.
3568 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3569 - [`cfg` attributes and `--cfg` command line flags are now more
3570 strictly validated.][53893]
3572 [53893]: https://github.com/rust-lang/rust/pull/53893/
3573 [52861]: https://github.com/rust-lang/rust/pull/52861/
3574 [51966]: https://github.com/rust-lang/rust/pull/51966/
3575 [52656]: https://github.com/rust-lang/rust/pull/52656/
3576 [52239]: https://github.com/rust-lang/rust/pull/52239/
3577 [52330]: https://github.com/rust-lang/rust/pull/52330/
3578 [52354]: https://github.com/rust-lang/rust/pull/52354/
3579 [52402]: https://github.com/rust-lang/rust/pull/52402/
3580 [52103]: https://github.com/rust-lang/rust/pull/52103/
3581 [52197]: https://github.com/rust-lang/rust/pull/52197/
3582 [51807]: https://github.com/rust-lang/rust/pull/51807/
3583 [51899]: https://github.com/rust-lang/rust/pull/51899/
3584 [51912]: https://github.com/rust-lang/rust/pull/51912/
3585 [51511]: https://github.com/rust-lang/rust/pull/51511/
3586 [51619]: https://github.com/rust-lang/rust/pull/51619/
3587 [51656]: https://github.com/rust-lang/rust/pull/51656/
3588 [51178]: https://github.com/rust-lang/rust/pull/51178/
3589 [51122]: https://github.com/rust-lang/rust/pull/51122
3590 [50494]: https://github.com/rust-lang/rust/pull/50494/
3591 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3592 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3593 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3594 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3595 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3596 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3597 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3600 Version 1.28.0 (2018-08-02)
3601 ===========================
3605 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3606 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3607 the inner type across Foreign Function Interface (FFI) boundaries.
3608 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3609 and can now be used as identifiers.][51196]
3610 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3611 stable.][51241] This will allow users to specify a global allocator for
3613 - [Unit test functions marked with the `#[test]` attribute can now return
3614 `Result<(), E: Debug>` in addition to `()`.][51298]
3615 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3616 allows macros to easily target lifetimes.
3620 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3621 prioritise making smaller binary sizes. `z` is the same as `s` with the
3622 exception that it does not vectorise loops, which typically results in an even
3624 - [The short error format is now stable.][49546] Specified with
3625 `--error-format=short` this option will provide a more compressed output of
3626 rust error messages.
3627 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3628 - [Reduced the number of allocations in the macro parser.][50855] This can
3629 improve compile times of macro heavy crates on average by 5%.
3633 - [Implemented `Default` for `&mut str`.][51306]
3634 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3635 - [Implemented `Extend` for `()`.][50234]
3636 - [The `Debug` implementation of `time::Duration` should now be more easily
3637 human readable.][50364] Previously a `Duration` of one second would printed as
3638 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3639 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3640 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3641 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3642 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3643 for `PathBuf`.][50170]
3644 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3645 and `Wrapping<i128>`.][50465]
3646 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3647 possible.][51050] This can provide up to a 40% speed increase.
3648 - [Improved error messages when using `format!`.][50610]
3652 - [`Iterator::step_by`]
3653 - [`Path::ancestors`]
3654 - [`SystemTime::UNIX_EPOCH`]
3655 - [`alloc::GlobalAlloc`]
3657 - [`alloc::LayoutErr`]
3660 - [`alloc::alloc_zeroed`]
3661 - [`alloc::dealloc`]
3662 - [`alloc::realloc`]
3663 - [`alloc::handle_alloc_error`]
3664 - [`btree_map::Entry::or_default`]
3665 - [`fmt::Alignment`]
3666 - [`hash_map::Entry::or_default`]
3667 - [`iter::repeat_with`]
3668 - [`num::NonZeroUsize`]
3669 - [`num::NonZeroU128`]
3670 - [`num::NonZeroU16`]
3671 - [`num::NonZeroU32`]
3672 - [`num::NonZeroU64`]
3673 - [`num::NonZeroU8`]
3674 - [`ops::RangeBounds`]
3675 - [`slice::SliceIndex`]
3676 - [`slice::from_mut`]
3677 - [`slice::from_ref`]
3678 - [`{Any + Send + Sync}::downcast_mut`]
3679 - [`{Any + Send + Sync}::downcast_ref`]
3680 - [`{Any + Send + Sync}::is`]
3684 - [Cargo will now no longer allow you to publish crates with build scripts that
3685 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3686 considered to be immutable.
3690 - [The `suggestion_applicability` field in `rustc`'s json output is now
3691 stable.][50486] This will allow dev tools to check whether a code suggestion
3692 would apply to them.
3696 - [Rust will consider trait objects with duplicated constraints to be the same
3697 type as without the duplicated constraint.][51276] For example the below code will
3698 now fail to compile.
3703 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3706 impl Trait + Send + Send {
3707 fn test(&self) { println!("two"); }
3711 [49546]: https://github.com/rust-lang/rust/pull/49546/
3712 [50143]: https://github.com/rust-lang/rust/pull/50143/
3713 [50170]: https://github.com/rust-lang/rust/pull/50170/
3714 [50234]: https://github.com/rust-lang/rust/pull/50234/
3715 [50265]: https://github.com/rust-lang/rust/pull/50265/
3716 [50364]: https://github.com/rust-lang/rust/pull/50364/
3717 [50385]: https://github.com/rust-lang/rust/pull/50385/
3718 [50465]: https://github.com/rust-lang/rust/pull/50465/
3719 [50486]: https://github.com/rust-lang/rust/pull/50486/
3720 [50554]: https://github.com/rust-lang/rust/pull/50554/
3721 [50610]: https://github.com/rust-lang/rust/pull/50610/
3722 [50855]: https://github.com/rust-lang/rust/pull/50855/
3723 [51050]: https://github.com/rust-lang/rust/pull/51050/
3724 [51196]: https://github.com/rust-lang/rust/pull/51196/
3725 [51200]: https://github.com/rust-lang/rust/pull/51200/
3726 [51241]: https://github.com/rust-lang/rust/pull/51241/
3727 [51276]: https://github.com/rust-lang/rust/pull/51276/
3728 [51298]: https://github.com/rust-lang/rust/pull/51298/
3729 [51306]: https://github.com/rust-lang/rust/pull/51306/
3730 [51562]: https://github.com/rust-lang/rust/pull/51562/
3731 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3732 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3733 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3734 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3735 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3736 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3737 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3738 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3739 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3740 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3741 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3742 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3743 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3744 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3745 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3746 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3747 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3748 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3749 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3750 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3751 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3752 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3753 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3754 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3755 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3756 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3757 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3758 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3759 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3760 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3762 Version 1.27.2 (2018-07-20)
3763 ===========================
3768 - The borrow checker was fixed to avoid potential unsoundness when using
3769 match ergonomics: [#52213][52213].
3771 [52213]: https://github.com/rust-lang/rust/issues/52213
3773 Version 1.27.1 (2018-07-10)
3774 ===========================
3779 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3780 when running, which enabled executing code as some other user on a
3781 given machine. This release fixes that vulnerability; you can read
3782 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3784 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3789 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3790 match ergonomics: [#51415][51415], [#49534][49534].
3792 [51415]: https://github.com/rust-lang/rust/issues/51415
3793 [49534]: https://github.com/rust-lang/rust/issues/49534
3794 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3795 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3797 Version 1.27.0 (2018-06-21)
3798 ==========================
3802 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3803 be used as an identifier.
3804 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3805 bare `Trait` syntax, and should make it clearer when being used in tandem with
3806 `impl Trait` because it is equivalent to the following syntax:
3807 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3808 `Box<Trait> == Box<dyn Trait>`.
3809 - [Attributes on generic parameters such as types and lifetimes are
3810 now stable.][48851] e.g.
3811 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3812 - [The `#[must_use]` attribute can now also be used on functions as well as
3813 types.][48925] It provides a lint that by default warns users when the
3814 value returned by a function has not been used.
3818 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3822 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3823 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3824 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3825 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3826 the `cfg` attribute.
3827 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3828 std are now available in core.][49896]
3829 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3831 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3832 that the operation isn't done in place.
3833 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3834 the `#[must_use]` attribute][49533] to warn about unused potentially
3835 expensive allocations.
3839 - [`DoubleEndedIterator::rfind`]
3840 - [`DoubleEndedIterator::rfold`]
3841 - [`DoubleEndedIterator::try_rfold`]
3842 - [`Duration::from_micros`]
3843 - [`Duration::from_nanos`]
3844 - [`Duration::subsec_micros`]
3845 - [`Duration::subsec_millis`]
3846 - [`HashMap::remove_entry`]
3847 - [`Iterator::try_fold`]
3848 - [`Iterator::try_for_each`]
3850 - [`Option::filter`]
3851 - [`String::replace_range`]
3852 - [`Take::set_limit`]
3853 - [`hint::unreachable_unchecked`]
3854 - [`os::unix::process::parent_id`]
3855 - [`ptr::swap_nonoverlapping`]
3856 - [`slice::rsplit_mut`]
3858 - [`slice::swap_with_slice`]
3862 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3863 `readme`, and `repository` fields.][cargo/5386]
3864 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3865 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3866 a different directory than `target` for placing compilation artifacts.
3867 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3868 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3869 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3870 where cargo would infer a binary, Cargo will produce a warning. You can
3871 disable this feature ahead of time by setting any of the following to false:
3872 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3873 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3874 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3878 - [Added “The Rustc book” into the official documentation.][49707]
3879 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3880 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3884 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3885 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3886 compile, `"".is_empty()` will still compile.
3887 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3888 will only print the inner type.][48553] E.g.
3889 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3890 not `AtomicBool(true)`.
3891 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3892 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3893 alignment should cover all use cases.
3894 - The `.description()` method on the `std::error::Error` trait
3895 [has been soft-deprecated][50163]. It is no longer required to implement it.
3897 [48553]: https://github.com/rust-lang/rust/pull/48553/
3898 [48851]: https://github.com/rust-lang/rust/pull/48851/
3899 [48925]: https://github.com/rust-lang/rust/pull/48925/
3900 [49533]: https://github.com/rust-lang/rust/pull/49533/
3901 [49623]: https://github.com/rust-lang/rust/pull/49623/
3902 [49630]: https://github.com/rust-lang/rust/pull/49630/
3903 [49664]: https://github.com/rust-lang/rust/pull/49664/
3904 [49699]: https://github.com/rust-lang/rust/pull/49699/
3905 [49707]: https://github.com/rust-lang/rust/pull/49707/
3906 [49719]: https://github.com/rust-lang/rust/pull/49719/
3907 [49896]: https://github.com/rust-lang/rust/pull/49896/
3908 [49968]: https://github.com/rust-lang/rust/pull/49968/
3909 [50163]: https://github.com/rust-lang/rust/pull/50163
3910 [50177]: https://github.com/rust-lang/rust/pull/50177/
3911 [50378]: https://github.com/rust-lang/rust/pull/50378/
3912 [50398]: https://github.com/rust-lang/rust/pull/50398/
3913 [50423]: https://github.com/rust-lang/rust/pull/50423/
3914 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3915 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3916 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3917 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3918 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3919 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3920 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3921 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3922 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3923 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3924 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3925 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3926 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3927 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3928 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3929 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3930 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3931 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3932 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3933 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3934 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3935 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3936 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3937 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3938 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3939 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3940 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3941 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3942 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3943 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3946 Version 1.26.2 (2018-06-05)
3947 ==========================
3952 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3954 [51117]: https://github.com/rust-lang/rust/issues/51117
3957 Version 1.26.1 (2018-05-29)
3958 ==========================
3963 - [RLS now works on Windows.][50646]
3964 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3970 - [`fn main() -> impl Trait` no longer works for non-Termination
3972 This reverts an accidental stabilization.
3973 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3974 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3976 [50646]: https://github.com/rust-lang/rust/issues/50646
3977 [50656]: https://github.com/rust-lang/rust/pull/50656
3978 [50812]: https://github.com/rust-lang/rust/pull/50812
3979 [50950]: https://github.com/rust-lang/rust/issues/50950
3980 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3982 Version 1.26.0 (2018-05-10)
3983 ==========================
3987 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3988 implement either or both traits.][49299]
3989 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3990 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3991 lifetime can be elided.][49458]
3992 - [`impl Trait` is now stable allowing you to have abstract types in returns
3993 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3994 `fn open(path: impl AsRef<Path>)`.
3995 - [Pattern matching will now automatically apply dereferences.][49394]
3996 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3997 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3998 - [A lot of operations are now available in a const context.][46882] E.g. You
3999 can now index into constant arrays, reference and dereference into constants,
4000 and use tuple struct constructors.
4001 - [Fixed entry slice patterns are now stable.][48516] E.g.
4003 let points = [1, 2, 3, 4];
4005 [1, 2, 3, 4] => println!("All points were sequential."),
4006 _ => println!("Not all points were sequential."),
4013 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4014 - [Fixed exponential projection complexity on nested types.][48296]
4015 This can provide up to a ~12% reduction in compile times for certain crates.
4016 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4017 to remap path prefixes outputted by the compiler.
4018 - [Added `powerpc-unknown-netbsd` target.][48281]
4022 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4023 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4024 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4025 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4026 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4027 - [`ascii::escape_default` is now available in libcore.][48735]
4028 - [Trailing commas are now supported in std and core macros.][48056]
4029 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4030 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4035 - [`*const T::copy_to_nonoverlapping`]
4036 - [`*const T::copy_to`]
4037 - [`*const T::read_unaligned`]
4038 - [`*const T::read_volatile`]
4039 - [`*const T::read`]
4041 - [`*const T::wrapping_add`]
4042 - [`*const T::wrapping_sub`]
4044 - [`*mut T::copy_to_nonoverlapping`]
4045 - [`*mut T::copy_to`]
4046 - [`*mut T::read_unaligned`]
4047 - [`*mut T::read_volatile`]
4049 - [`*mut T::replace`]
4052 - [`*mut T::wrapping_add`]
4053 - [`*mut T::wrapping_sub`]
4054 - [`*mut T::write_bytes`]
4055 - [`*mut T::write_unaligned`]
4056 - [`*mut T::write_volatile`]
4059 - [`FromUtf8Error::as_bytes`]
4060 - [`LocalKey::try_with`]
4061 - [`Option::cloned`]
4062 - [`btree_map::Entry::and_modify`]
4063 - [`fs::read_to_string`]
4066 - [`hash_map::Entry::and_modify`]
4067 - [`iter::FusedIterator`]
4068 - [`ops::RangeInclusive`]
4069 - [`ops::RangeToInclusive`]
4071 - [`slice::rotate_left`]
4072 - [`slice::rotate_right`]
4073 - [`String::retain`]
4078 - [Cargo will now output path to custom commands when `-v` is
4079 passed with `--list`][cargo/5041]
4080 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4084 - [The second edition of "The Rust Programming Language" book is now recommended
4085 over the first.][48404]
4090 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4091 syntax is now invalid.
4093 use std::ops::Fn as dyn;
4094 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4096 - [The result of dereferences are no longer promoted to `'static`.][47408]
4100 const PAIR: &(i32, i32) = &(0, 1);
4101 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4104 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4105 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4107 - [Removed hoedown from rustdoc.][48274]
4108 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4110 [46882]: https://github.com/rust-lang/rust/pull/46882
4111 [47379]: https://github.com/rust-lang/rust/pull/47379
4112 [47408]: https://github.com/rust-lang/rust/pull/47408
4113 [47813]: https://github.com/rust-lang/rust/pull/47813
4114 [48056]: https://github.com/rust-lang/rust/pull/48056
4115 [48125]: https://github.com/rust-lang/rust/pull/48125
4116 [48166]: https://github.com/rust-lang/rust/pull/48166
4117 [48235]: https://github.com/rust-lang/rust/pull/48235
4118 [48274]: https://github.com/rust-lang/rust/pull/48274
4119 [48281]: https://github.com/rust-lang/rust/pull/48281
4120 [48296]: https://github.com/rust-lang/rust/pull/48296
4121 [48326]: https://github.com/rust-lang/rust/pull/48326
4122 [48359]: https://github.com/rust-lang/rust/pull/48359
4123 [48404]: https://github.com/rust-lang/rust/pull/48404
4124 [48481]: https://github.com/rust-lang/rust/pull/48481
4125 [48516]: https://github.com/rust-lang/rust/pull/48516
4126 [48628]: https://github.com/rust-lang/rust/pull/48628
4127 [48629]: https://github.com/rust-lang/rust/pull/48629
4128 [48657]: https://github.com/rust-lang/rust/pull/48657
4129 [48735]: https://github.com/rust-lang/rust/pull/48735
4130 [48978]: https://github.com/rust-lang/rust/pull/48978
4131 [49101]: https://github.com/rust-lang/rust/pull/49101
4132 [49109]: https://github.com/rust-lang/rust/pull/49109
4133 [49121]: https://github.com/rust-lang/rust/pull/49121
4134 [49162]: https://github.com/rust-lang/rust/pull/49162
4135 [49184]: https://github.com/rust-lang/rust/pull/49184
4136 [49234]: https://github.com/rust-lang/rust/pull/49234
4137 [49255]: https://github.com/rust-lang/rust/pull/49255
4138 [49299]: https://github.com/rust-lang/rust/pull/49299
4139 [49305]: https://github.com/rust-lang/rust/pull/49305
4140 [49394]: https://github.com/rust-lang/rust/pull/49394
4141 [49458]: https://github.com/rust-lang/rust/pull/49458
4142 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4143 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4144 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4145 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4146 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4147 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4148 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4149 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4150 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4151 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4152 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4153 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4154 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4155 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4156 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4157 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4158 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4159 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4160 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4161 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4162 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4163 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4164 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4165 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4166 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4167 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4168 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4169 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4170 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4171 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4172 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4173 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4174 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4175 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4176 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4177 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4178 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4179 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4180 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4181 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4182 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4183 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4186 Version 1.25.0 (2018-03-29)
4187 ==========================
4191 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4192 - [You can now use nested groups of imports.][47948]
4193 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4194 - [You can now have `|` at the start of a match arm.][47947] e.g.
4196 enum Foo { A, B, C }
4202 | Foo::B => println!("AB"),
4203 | Foo::C => println!("C"),
4210 - [Upgraded to LLVM 6.][47828]
4211 - [Added `-C lto=val` option.][47521]
4212 - [Added `i586-unknown-linux-musl` target][47282]
4216 - [Impl Send for `process::Command` on Unix.][47760]
4217 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4218 - [`UnsafeCell::into_inner` is now safe.][47204]
4219 - [Implement libstd for CloudABI.][47268]
4220 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4221 - [Implement `AsRef<Path>` for Component][46985]
4222 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4223 - [Moved `Duration` to libcore.][46666]
4227 - [`Location::column`]
4230 The following functions can now be used in a constant expression.
4231 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4232 - [`Duration::new`][47300]
4233 - [`Duration::from_secs`][47300]
4234 - [`Duration::from_millis`][47300]
4238 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4239 - [`cargo new` now defaults to creating a binary crate, instead of a
4240 library crate.][cargo/5029]
4244 - [Rust by example is now shipped with new releases][46196]
4248 - [Deprecated `net::lookup_host`.][47510]
4249 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4250 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4251 around indexing operations (see [#47349][47349]). This has been fixed (which also
4252 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4253 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4255 [33903]: https://github.com/rust-lang/rust/pull/33903
4256 [47947]: https://github.com/rust-lang/rust/pull/47947
4257 [47948]: https://github.com/rust-lang/rust/pull/47948
4258 [47760]: https://github.com/rust-lang/rust/pull/47760
4259 [47790]: https://github.com/rust-lang/rust/pull/47790
4260 [47828]: https://github.com/rust-lang/rust/pull/47828
4261 [47398]: https://github.com/rust-lang/rust/pull/47398
4262 [47510]: https://github.com/rust-lang/rust/pull/47510
4263 [47521]: https://github.com/rust-lang/rust/pull/47521
4264 [47204]: https://github.com/rust-lang/rust/pull/47204
4265 [47251]: https://github.com/rust-lang/rust/pull/47251
4266 [47268]: https://github.com/rust-lang/rust/pull/47268
4267 [47282]: https://github.com/rust-lang/rust/pull/47282
4268 [47300]: https://github.com/rust-lang/rust/pull/47300
4269 [47349]: https://github.com/rust-lang/rust/pull/47349
4270 [46931]: https://github.com/rust-lang/rust/pull/46931
4271 [46985]: https://github.com/rust-lang/rust/pull/46985
4272 [47006]: https://github.com/rust-lang/rust/pull/47006
4273 [46830]: https://github.com/rust-lang/rust/pull/46830
4274 [46095]: https://github.com/rust-lang/rust/pull/46095
4275 [46666]: https://github.com/rust-lang/rust/pull/46666
4276 [46196]: https://github.com/rust-lang/rust/pull/46196
4277 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4278 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4279 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4280 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4281 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4284 Version 1.24.1 (2018-03-01)
4285 ==========================
4287 - [Do not abort when unwinding through FFI][48251]
4288 - [Emit UTF-16 files for linker arguments on Windows][48318]
4289 - [Make the error index generator work again][48308]
4290 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4292 [48251]: https://github.com/rust-lang/rust/issues/48251
4293 [48308]: https://github.com/rust-lang/rust/issues/48308
4294 [48318]: https://github.com/rust-lang/rust/issues/48318
4295 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4298 Version 1.24.0 (2018-02-15)
4299 ==========================
4303 - [External `sysv64` ffi is now available.][46528]
4304 eg. `extern "sysv64" fn foo () {}`
4308 - [rustc now uses 16 codegen units by default for release builds.][46910]
4309 For the fastest builds, utilize `codegen-units=1`.
4310 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4311 - [Add `aarch64-unknown-openbsd` support][46760]
4315 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4316 improvement in performance in the majority of cases.
4317 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4318 with Windows.][46798]
4319 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4320 - [impl `From<bool>` for `AtomicBool`][46293]
4321 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4322 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4323 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4324 - [float::from_bits now just uses transmute.][46012] This provides
4325 some optimisations from LLVM.
4326 - [Copied `AsciiExt` methods onto `char`][46077]
4327 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4328 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4329 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4330 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4334 - [`RefCell::replace`]
4336 - [`atomic::spin_loop_hint`]
4338 The following functions can now be used in a constant expression.
4339 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4341 - [`AtomicBool::new`][46287]
4342 - [`AtomicUsize::new`][46287]
4343 - [`AtomicIsize::new`][46287]
4344 - [`AtomicPtr::new`][46287]
4345 - [`Cell::new`][46287]
4346 - [`{integer}::min_value`][46287]
4347 - [`{integer}::max_value`][46287]
4348 - [`mem::size_of`][46287]
4349 - [`mem::align_of`][46287]
4350 - [`ptr::null`][46287]
4351 - [`ptr::null_mut`][46287]
4352 - [`RefCell::new`][46287]
4353 - [`UnsafeCell::new`][46287]
4357 - [Added a `workspace.default-members` config that
4358 overrides implied `--all` in virtual workspaces.][cargo/4743]
4359 - [Enable incremental by default on development builds.][cargo/4817] Also added
4360 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4361 per-project or global basis respectively.
4368 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4369 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4370 in accordance with IETF RFC 4291 §2.2.
4371 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4372 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4373 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4374 - [Leading zeros in tuple struct members is now an error][47084]
4375 - [`column!()` macro is one-based instead of zero-based][46977]
4376 - [`fmt::Arguments` can no longer be shared across threads][45198]
4377 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4378 - [Cargo sets a different working directory for the compiler][cargo/4788]
4380 [44884]: https://github.com/rust-lang/rust/pull/44884
4381 [45198]: https://github.com/rust-lang/rust/pull/45198
4382 [45506]: https://github.com/rust-lang/rust/pull/45506
4383 [45904]: https://github.com/rust-lang/rust/pull/45904
4384 [45990]: https://github.com/rust-lang/rust/pull/45990
4385 [46012]: https://github.com/rust-lang/rust/pull/46012
4386 [46077]: https://github.com/rust-lang/rust/pull/46077
4387 [46094]: https://github.com/rust-lang/rust/pull/46094
4388 [46284]: https://github.com/rust-lang/rust/pull/46284
4389 [46287]: https://github.com/rust-lang/rust/pull/46287
4390 [46293]: https://github.com/rust-lang/rust/pull/46293
4391 [46528]: https://github.com/rust-lang/rust/pull/46528
4392 [46671]: https://github.com/rust-lang/rust/pull/46671
4393 [46713]: https://github.com/rust-lang/rust/pull/46713
4394 [46735]: https://github.com/rust-lang/rust/pull/46735
4395 [46749]: https://github.com/rust-lang/rust/pull/46749
4396 [46760]: https://github.com/rust-lang/rust/pull/46760
4397 [46798]: https://github.com/rust-lang/rust/pull/46798
4398 [46828]: https://github.com/rust-lang/rust/pull/46828
4399 [46831]: https://github.com/rust-lang/rust/pull/46831
4400 [46833]: https://github.com/rust-lang/rust/pull/46833
4401 [46910]: https://github.com/rust-lang/rust/pull/46910
4402 [46977]: https://github.com/rust-lang/rust/pull/46977
4403 [47018]: https://github.com/rust-lang/rust/pull/47018
4404 [47080]: https://github.com/rust-lang/rust/pull/47080
4405 [47084]: https://github.com/rust-lang/rust/pull/47084
4406 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4407 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4408 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4409 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4410 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4411 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4414 Version 1.23.0 (2018-01-04)
4415 ==========================
4419 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4420 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4421 Which should fix some confusing errors in some operations.
4425 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4426 undefined behavior.][45920]
4427 - [rustc now suggests renaming import if names clash.][45660]
4428 - [Display errors/warnings correctly when there are zero-width or
4429 wide characters.][45711]
4430 - [rustc now avoids unnecessary copies of arguments that are
4431 simple bindings][45380] This should improve memory usage on average by 5-10%.
4432 - [Updated musl used to build musl rustc to 1.1.17][45393]
4436 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4437 - [Implement Hash for raw pointers to unsized types][45483]
4438 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4439 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4440 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4441 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4442 and `<*mut T>::as_mut`][44932]
4443 - [Optimized `Thread::{park, unpark}` implementation][45524]
4444 - [Improved `SliceExt::binary_search` performance.][45333]
4445 - [impl `FromIterator<()>` for `()`][45379]
4446 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4454 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4455 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4456 - [Added unit test checking to `cargo check`][cargo/4592]
4457 - [Cargo now lets you install a specific version
4458 using `cargo install --version`][cargo/4637]
4462 - [Releases now ship with the Cargo book documentation.][45692]
4463 - [rustdoc now prints rendering warnings on every run.][45324]
4467 - [Changes have been made to type equality to make it more correct,
4468 in rare cases this could break some code.][45853] [Tracking issue for
4469 further information][45852]
4470 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4471 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4472 Android 9, the minimum supported version is Android 14.
4473 - [Bumped the minimum LLVM to 3.9][45326]
4475 [44042]: https://github.com/rust-lang/rust/pull/44042
4476 [44932]: https://github.com/rust-lang/rust/pull/44932
4477 [45267]: https://github.com/rust-lang/rust/pull/45267
4478 [45324]: https://github.com/rust-lang/rust/pull/45324
4479 [45326]: https://github.com/rust-lang/rust/pull/45326
4480 [45333]: https://github.com/rust-lang/rust/pull/45333
4481 [45379]: https://github.com/rust-lang/rust/pull/45379
4482 [45380]: https://github.com/rust-lang/rust/pull/45380
4483 [45393]: https://github.com/rust-lang/rust/pull/45393
4484 [45435]: https://github.com/rust-lang/rust/pull/45435
4485 [45483]: https://github.com/rust-lang/rust/pull/45483
4486 [45524]: https://github.com/rust-lang/rust/pull/45524
4487 [45571]: https://github.com/rust-lang/rust/pull/45571
4488 [45580]: https://github.com/rust-lang/rust/pull/45580
4489 [45610]: https://github.com/rust-lang/rust/pull/45610
4490 [45660]: https://github.com/rust-lang/rust/pull/45660
4491 [45692]: https://github.com/rust-lang/rust/pull/45692
4492 [45711]: https://github.com/rust-lang/rust/pull/45711
4493 [45772]: https://github.com/rust-lang/rust/pull/45772
4494 [45852]: https://github.com/rust-lang/rust/issues/45852
4495 [45853]: https://github.com/rust-lang/rust/pull/45853
4496 [45887]: https://github.com/rust-lang/rust/pull/45887
4497 [45920]: https://github.com/rust-lang/rust/pull/45920
4498 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4499 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4500 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4503 Version 1.22.1 (2017-11-22)
4504 ==========================
4506 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4508 [46183]: https://github.com/rust-lang/rust/pull/46183
4510 Version 1.22.0 (2017-11-22)
4511 ==========================
4515 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4516 - [Now accepts underscores in unicode escapes][43716]
4517 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4518 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4522 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4523 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4524 This should decrease compile times for debug builds.
4525 - [strict memory alignment now enabled on ARMv6][45094]
4526 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4530 - [Allow atomic operations up to 32 bits
4531 on `armv5te_unknown_linux_gnueabi`][44978]
4532 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4533 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4534 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4535 - [Properly detect overflow in `Instant += Duration`.][44220]
4536 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4537 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4538 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4545 - [Cargo will now build multi file examples in subdirectories of the `examples`
4546 folder that have a `main.rs` file.][cargo/4496]
4547 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4548 the old format will continue to work and can be updated with `cargo update`.
4549 - [Now supports vendoring git repositories][cargo/3992]
4553 - [`libbacktrace` is now available on Apple platforms.][44251]
4554 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4555 This now lets you specify that a given code example will fail to compile.
4559 - [The minimum Android version that rustc can build for has been bumped
4560 to `4.0` from `2.3`][45656]
4561 - [Allowing `T op= &T` for numeric types has broken some type
4562 inference cases][45480]
4565 [42526]: https://github.com/rust-lang/rust/pull/42526
4566 [43017]: https://github.com/rust-lang/rust/pull/43017
4567 [43716]: https://github.com/rust-lang/rust/pull/43716
4568 [43949]: https://github.com/rust-lang/rust/pull/43949
4569 [44015]: https://github.com/rust-lang/rust/pull/44015
4570 [44220]: https://github.com/rust-lang/rust/pull/44220
4571 [44251]: https://github.com/rust-lang/rust/pull/44251
4572 [44287]: https://github.com/rust-lang/rust/pull/44287
4573 [44303]: https://github.com/rust-lang/rust/pull/44303
4574 [44456]: https://github.com/rust-lang/rust/pull/44456
4575 [44466]: https://github.com/rust-lang/rust/pull/44466
4576 [44895]: https://github.com/rust-lang/rust/pull/44895
4577 [44966]: https://github.com/rust-lang/rust/pull/44966
4578 [44978]: https://github.com/rust-lang/rust/pull/44978
4579 [45041]: https://github.com/rust-lang/rust/pull/45041
4580 [45064]: https://github.com/rust-lang/rust/pull/45064
4581 [45075]: https://github.com/rust-lang/rust/pull/45075
4582 [45094]: https://github.com/rust-lang/rust/pull/45094
4583 [45095]: https://github.com/rust-lang/rust/pull/45095
4584 [45480]: https://github.com/rust-lang/rust/issues/45480
4585 [45656]: https://github.com/rust-lang/rust/pull/45656
4586 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4587 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4588 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4595 Version 1.21.0 (2017-10-12)
4596 ==========================
4600 - [You can now use static references for literals.][43838]
4604 let x: &'static u32 = &0;
4607 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4610 my_macro!(Vec<i32>::new); // Always worked
4611 my_macro!(Vec::<i32>::new); // Now works
4616 - [Upgraded jemalloc to 4.5.0][43911]
4617 - [Enabled unwinding panics on Redox][43917]
4618 - [Now runs LLVM in parallel during translation phase.][43506]
4619 This should reduce peak memory usage.
4623 - [Generate builtin impls for `Clone` for all arrays and tuples that
4624 are `T: Clone`][43690]
4625 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4626 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4627 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4632 [`std::mem::discriminant`]
4636 - [You can now call `cargo install` with multiple package names][cargo/4216]
4637 - [Cargo commands inside a virtual workspace will now implicitly
4638 pass `--all`][cargo/4335]
4639 - [Added a `[patch]` section to `Cargo.toml` to handle
4640 prepublication dependencies][cargo/4123] [RFC 1969]
4641 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4642 like patterns][cargo/4270]
4643 - [Added the `--all-targets` option][cargo/4400]
4644 - [Using required dependencies as a feature is now deprecated and emits
4645 a warning][cargo/4364]
4650 - [Cargo docs are moving][43916]
4651 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4652 - [The rustdoc book is now available][43863]
4653 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4654 - [Added a preview of RLS has been made available through rustup][44204]
4655 Install with `rustup component add rls-preview`
4656 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4657 Previously only showed `std::os::unix`.
4661 - [Changes in method matching against higher-ranked types][43880] This may cause
4662 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4663 - [rustc's JSON error output's byte position start at top of file.][42973]
4664 Was previously relative to the rustc's internal `CodeMap` struct which
4665 required the unstable library `libsyntax` to correctly use.
4666 - [`unused_results` lint no longer ignores booleans][43728]
4668 [42565]: https://github.com/rust-lang/rust/pull/42565
4669 [42973]: https://github.com/rust-lang/rust/pull/42973
4670 [43348]: https://github.com/rust-lang/rust/pull/43348
4671 [43459]: https://github.com/rust-lang/rust/pull/43459
4672 [43506]: https://github.com/rust-lang/rust/pull/43506
4673 [43540]: https://github.com/rust-lang/rust/pull/43540
4674 [43690]: https://github.com/rust-lang/rust/pull/43690
4675 [43728]: https://github.com/rust-lang/rust/pull/43728
4676 [43838]: https://github.com/rust-lang/rust/pull/43838
4677 [43863]: https://github.com/rust-lang/rust/pull/43863
4678 [43880]: https://github.com/rust-lang/rust/pull/43880
4679 [43911]: https://github.com/rust-lang/rust/pull/43911
4680 [43916]: https://github.com/rust-lang/rust/pull/43916
4681 [43917]: https://github.com/rust-lang/rust/pull/43917
4682 [44204]: https://github.com/rust-lang/rust/pull/44204
4683 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4684 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4685 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4686 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4687 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4688 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4689 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4690 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4691 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4693 Version 1.20.0 (2017-08-31)
4694 ===========================
4698 - [Associated constants are now stabilised.][42809]
4699 - [A lot of macro bugs are now fixed.][42913]
4704 - [Struct fields are now properly coerced to the expected field type.][42807]
4705 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4706 `wasm32-experimental-emscripten` target.
4707 - [Changed some of the error messages to be more helpful.][42033]
4708 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4710 - [rustc now reports the total number of errors on compilation failure][43015]
4711 previously this was only the number of errors in the pass that failed.
4712 - [Expansion in rustc has been sped up 29x.][42533]
4713 - [added `msp430-none-elf` target.][43099]
4714 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4716 - [Fixes backtraces on Redox][43228]
4717 - [rustc now identifies different versions of same crate when absolute paths of
4718 different types match in an error message.][42826]
4724 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4725 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4727 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4728 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4729 - [Impl `Clone` for `DefaultHasher`.][42799]
4730 - [Impl `Sync` for `SyncSender`.][42397]
4731 - [Impl `FromStr` for `char`][42271]
4732 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4734 - [allow messages in the `unimplemented!()` macro.][42155]
4735 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4736 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4737 - [Upgrade to Unicode 10.0.0][42999]
4738 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4739 - [Skip the main thread's manual stack guard on Linux][43072]
4740 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4741 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4743 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4748 - [`CStr::into_c_string`]
4749 - [`CString::as_c_str`]
4750 - [`CString::into_boxed_c_str`]
4751 - [`Chain::get_mut`]
4752 - [`Chain::get_ref`]
4753 - [`Chain::into_inner`]
4754 - [`Option::get_or_insert_with`]
4755 - [`Option::get_or_insert`]
4756 - [`OsStr::into_os_string`]
4757 - [`OsString::into_boxed_os_str`]
4760 - [`Utf8Error::error_len`]
4761 - [`char::EscapeDebug`]
4762 - [`char::escape_debug`]
4763 - [`compile_error!`]
4764 - [`f32::from_bits`]
4766 - [`f64::from_bits`]
4768 - [`mem::ManuallyDrop`]
4769 - [`slice::sort_unstable_by_key`]
4770 - [`slice::sort_unstable_by`]
4771 - [`slice::sort_unstable`]
4772 - [`str::from_boxed_utf8_unchecked`]
4773 - [`str::as_bytes_mut`]
4774 - [`str::as_bytes_mut`]
4775 - [`str::from_utf8_mut`]
4776 - [`str::from_utf8_unchecked_mut`]
4778 - [`str::get_unchecked_mut`]
4779 - [`str::get_unchecked`]
4781 - [`str::into_boxed_bytes`]
4786 - [Cargo API token location moved from `~/.cargo/config` to
4787 `~/.cargo/credentials`.][cargo/3978]
4788 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4789 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4790 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4791 - [You can now specify version of a binary when installed through
4792 `cargo install` using `--vers`.][cargo/4229]
4793 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4794 failure.][cargo/4248]
4795 - [Changed the convention around which file is the crate root.][cargo/4259]
4796 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4797 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4802 - [Functions with `'static` in their return types will now not be as usable as
4803 if they were using lifetime parameters instead.][42417]
4804 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4805 takes the sign of NaN into account where previously didn't.][42430]
4807 [42033]: https://github.com/rust-lang/rust/pull/42033
4808 [42155]: https://github.com/rust-lang/rust/pull/42155
4809 [42271]: https://github.com/rust-lang/rust/pull/42271
4810 [42397]: https://github.com/rust-lang/rust/pull/42397
4811 [42417]: https://github.com/rust-lang/rust/pull/42417
4812 [42430]: https://github.com/rust-lang/rust/pull/42430
4813 [42431]: https://github.com/rust-lang/rust/pull/42431
4814 [42533]: https://github.com/rust-lang/rust/pull/42533
4815 [42571]: https://github.com/rust-lang/rust/pull/42571
4816 [42613]: https://github.com/rust-lang/rust/pull/42613
4817 [42799]: https://github.com/rust-lang/rust/pull/42799
4818 [42807]: https://github.com/rust-lang/rust/pull/42807
4819 [42809]: https://github.com/rust-lang/rust/pull/42809
4820 [42822]: https://github.com/rust-lang/rust/pull/42822
4821 [42826]: https://github.com/rust-lang/rust/pull/42826
4822 [42854]: https://github.com/rust-lang/rust/pull/42854
4823 [42913]: https://github.com/rust-lang/rust/pull/42913
4824 [42999]: https://github.com/rust-lang/rust/pull/42999
4825 [43011]: https://github.com/rust-lang/rust/pull/43011
4826 [43015]: https://github.com/rust-lang/rust/pull/43015
4827 [43072]: https://github.com/rust-lang/rust/pull/43072
4828 [43077]: https://github.com/rust-lang/rust/pull/43077
4829 [43097]: https://github.com/rust-lang/rust/pull/43097
4830 [43099]: https://github.com/rust-lang/rust/pull/43099
4831 [43170]: https://github.com/rust-lang/rust/pull/43170
4832 [43178]: https://github.com/rust-lang/rust/pull/43178
4833 [43185]: https://github.com/rust-lang/rust/pull/43185
4834 [43228]: https://github.com/rust-lang/rust/pull/43228
4835 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4836 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4837 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4838 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4839 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4840 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4841 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4842 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4843 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4844 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4845 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4846 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4847 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4848 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4849 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4850 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4851 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4852 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4853 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4854 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4855 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4856 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4857 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4858 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4859 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4860 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4861 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4862 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4863 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4864 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4865 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4866 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4867 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4868 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4869 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4870 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4871 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4872 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4873 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4876 Version 1.19.0 (2017-07-20)
4877 ===========================
4882 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4883 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4884 - [Macro recursion limit increased to 1024 from 64.][41676]
4885 - [Added lint for detecting unused macros.][41907]
4886 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4887 For example: `let x = loop { break 7; };`
4888 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4889 contain `Copy` types and cannot have a `Drop` implementation.
4890 Example: `union Foo { bar: u8, baz: usize }`
4891 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4892 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4897 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4898 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4899 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4900 you should use `--target armv7-linux-androideabi`.
4901 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4902 - [Minor optimisation of string operations.][42037]
4903 - [Compiler error message is now `aborting due to previous error(s)` instead of
4904 `aborting due to N previous errors`][42150] This was previously inaccurate and
4905 would only count certain kinds of errors.
4906 - [The compiler now supports Visual Studio 2017][42225]
4907 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4908 - [Added a lot][42264] of [new error codes][42302]
4909 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4910 libraries with C Run-time Libraries(CRT) to be statically linked.
4911 - [Fixed various ARM codegen bugs][42740]
4916 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4917 `Extend<Cow<'a, str>>`][41449]
4918 - [`Vec` now implements `From<&mut [T]>`][41530]
4919 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4920 - [`SplitWhitespace` now implements `Clone`][41659]
4921 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4923 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4924 macros, but for printing to stderr.
4929 - [`OsString::shrink_to_fit`]
4932 - [`thread::ThreadId`]
4937 - [Build scripts can now add environment variables to the environment
4938 the crate is being compiled in.
4939 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4940 - [Subcommands now replace the current process rather than spawning a new
4941 child process][cargo/3970]
4942 - [Workspace members can now accept glob file patterns][cargo/3979]
4943 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4944 the members in a given workspace.][cargo/3988]
4945 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4946 - [Target directory path is now in the cargo metadata][cargo/4022]
4947 - [Cargo no longer checks out a local working directory for the
4948 crates.io index][cargo/4026] This should provide smaller file size for the
4949 registry, and improve cloning times, especially on Windows machines.
4950 - [Added an `--exclude` option for excluding certain packages when using the
4951 `--all` option][cargo/4031]
4952 - [Cargo will now automatically retry when receiving a 5xx error
4953 from crates.io][cargo/4032]
4954 - [The `--features` option now accepts multiple comma or space
4955 delimited values.][cargo/4084]
4956 - [Added support for custom target specific runners][cargo/3954]
4961 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4963 - [Rust will now release XZ compressed packages][rust-installer/57]
4964 - [rustup will now prefer to download rust packages with
4965 XZ compression][rustup/1100] over GZip packages.
4966 - [Added the ability to escape `#` in rust documentation][41785] By adding
4967 additional `#`'s ie. `##` is now `#`
4972 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4973 - [`-Z` flags are now no longer allowed to be used on the stable
4974 compiler.][41751] This has been a warning for a year previous to this.
4975 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4976 longer works][42844]. Users should migrate to the built-in `check`
4977 command, which has been available since 1.16.
4978 - [Ending a float literal with `._` is now a hard error.
4979 Example: `42._` .][41946]
4980 - [Any use of a private `extern crate` outside of its module is now a
4981 hard error.][36886] This was previously a warning.
4982 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4983 relative while the `::` prefix makes a path absolute, but was ignored and the
4984 path was relative regardless.
4985 - [Floating point constants in match patterns is now a hard error][36890]
4986 This was previously a warning.
4987 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4988 match patterns is now a hard error][36891] This was previously a warning.
4989 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4991 - [From the pound escape, lines consisting of multiple `#`s are
4993 - [It is an error to re-export private enum variants][42460]. This is
4994 known to break a number of crates that depend on an older version of
4996 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4997 to use it to find the linker, and the build will fail where it did
4998 not previously][42607]
5000 [36886]: https://github.com/rust-lang/rust/issues/36886
5001 [36888]: https://github.com/rust-lang/rust/issues/36888
5002 [36890]: https://github.com/rust-lang/rust/issues/36890
5003 [36891]: https://github.com/rust-lang/rust/issues/36891
5004 [36892]: https://github.com/rust-lang/rust/issues/36892
5005 [37406]: https://github.com/rust-lang/rust/issues/37406
5006 [39983]: https://github.com/rust-lang/rust/pull/39983
5007 [41145]: https://github.com/rust-lang/rust/pull/41145
5008 [41192]: https://github.com/rust-lang/rust/pull/41192
5009 [41258]: https://github.com/rust-lang/rust/pull/41258
5010 [41370]: https://github.com/rust-lang/rust/pull/41370
5011 [41449]: https://github.com/rust-lang/rust/pull/41449
5012 [41530]: https://github.com/rust-lang/rust/pull/41530
5013 [41624]: https://github.com/rust-lang/rust/pull/41624
5014 [41656]: https://github.com/rust-lang/rust/pull/41656
5015 [41659]: https://github.com/rust-lang/rust/pull/41659
5016 [41676]: https://github.com/rust-lang/rust/pull/41676
5017 [41751]: https://github.com/rust-lang/rust/pull/41751
5018 [41764]: https://github.com/rust-lang/rust/pull/41764
5019 [41785]: https://github.com/rust-lang/rust/pull/41785
5020 [41873]: https://github.com/rust-lang/rust/pull/41873
5021 [41907]: https://github.com/rust-lang/rust/pull/41907
5022 [41946]: https://github.com/rust-lang/rust/pull/41946
5023 [42016]: https://github.com/rust-lang/rust/pull/42016
5024 [42037]: https://github.com/rust-lang/rust/pull/42037
5025 [42068]: https://github.com/rust-lang/rust/pull/42068
5026 [42150]: https://github.com/rust-lang/rust/pull/42150
5027 [42162]: https://github.com/rust-lang/rust/pull/42162
5028 [42225]: https://github.com/rust-lang/rust/pull/42225
5029 [42264]: https://github.com/rust-lang/rust/pull/42264
5030 [42302]: https://github.com/rust-lang/rust/pull/42302
5031 [42460]: https://github.com/rust-lang/rust/issues/42460
5032 [42607]: https://github.com/rust-lang/rust/issues/42607
5033 [42740]: https://github.com/rust-lang/rust/pull/42740
5034 [42844]: https://github.com/rust-lang/rust/issues/42844
5035 [42948]: https://github.com/rust-lang/rust/pull/42948
5036 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5037 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5038 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5039 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5040 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5041 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5042 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5043 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5044 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5045 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5046 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5047 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5048 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5049 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5050 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5051 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5052 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5053 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5054 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5055 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5056 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5057 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5060 Version 1.18.0 (2017-06-08)
5061 ===========================
5066 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5067 make the item visible to just that module tree. Also accepts the keyword
5068 `crate` to make something public to the whole crate but not users of the
5069 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5070 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5071 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5072 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5073 types like `Write + Send`, trailing `+` are now supported in trait objects,
5074 and better error reporting for trait objects starting with `?Sized`.
5075 - [0e+10 is now a valid floating point literal][40589]
5076 - [Now warns if you bind a lifetime parameter to 'static][40734]
5077 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5078 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5079 representation in some cases.][40377]
5084 - [rustc can now emit mir with `--emit mir`][39891]
5085 - [Improved LLVM IR for trivial functions][40367]
5086 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5087 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5088 opportunities found through profiling
5089 - [Improved backtrace formatting when panicking][38165]
5094 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5095 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5096 iteration or reallocation.
5097 - [Simplified HashMap Bucket interface][40561] provides performance
5098 improvements for iterating and cloning.
5099 - [Specialize Vec::from_elem to use calloc][40409]
5100 - [Fixed Race condition in fs::create_dir_all][39799]
5101 - [No longer caching stdio on Windows][40516]
5102 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5103 2.50%~ faster and in one case now 12.50% faster.
5104 - [Optimized `AtomicBool::fetch_nand`][41143]
5109 - [`Child::try_wait`]
5110 - [`HashMap::retain`]
5111 - [`HashSet::retain`]
5113 - [`TcpStream::peek`]
5114 - [`UdpSocket::peek`]
5115 - [`UdpSocket::peek_from`]
5120 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5121 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5122 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5123 - [Added Android build support][cargo/3885]
5124 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5125 of a certain type, for example `cargo build --bins` will build all
5127 - [Added support for haiku][cargo/3952]
5132 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5133 - [Added rust-windbg script for better debugging on Windows][39983]
5134 - [Rust now uses the official cross compiler for NetBSD][40612]
5135 - [rustdoc now accepts `#` at the start of files][40828]
5136 - [Fixed jemalloc support for musl][41168]
5141 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5142 always placed after the sign if it exists and before the digits. With the `#`
5143 flag the zeroes are placed after the prefix and before the digits.
5144 - [Due to the struct field optimisation][40377], using `transmute` on structs
5145 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5146 always been undefined behavior, but is now more likely to break in practice.
5147 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5148 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5149 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5150 - [Overlapping inherent `impl`s are now a hard error][40728]
5151 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5152 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5153 `out.asm` and `out.ll` instead of only one of the filetypes.
5154 - [ calling a function that returns `Self` will no longer work][41805] when
5155 the size of `Self` cannot be statically determined.
5156 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5157 this has caused a few regressions namely:
5159 - Changed the link order of local static/dynamic libraries (respecting the
5160 order on given rather than having the compiler reorder).
5161 - Changed how MinGW is linked, native code linked to dynamic libraries
5162 may require manually linking to the gcc support library (for the native
5165 [38165]: https://github.com/rust-lang/rust/pull/38165
5166 [39799]: https://github.com/rust-lang/rust/pull/39799
5167 [39891]: https://github.com/rust-lang/rust/pull/39891
5168 [39983]: https://github.com/rust-lang/rust/pull/39983
5169 [40043]: https://github.com/rust-lang/rust/pull/40043
5170 [40241]: https://github.com/rust-lang/rust/pull/40241
5171 [40338]: https://github.com/rust-lang/rust/pull/40338
5172 [40367]: https://github.com/rust-lang/rust/pull/40367
5173 [40377]: https://github.com/rust-lang/rust/pull/40377
5174 [40409]: https://github.com/rust-lang/rust/pull/40409
5175 [40516]: https://github.com/rust-lang/rust/pull/40516
5176 [40556]: https://github.com/rust-lang/rust/pull/40556
5177 [40561]: https://github.com/rust-lang/rust/pull/40561
5178 [40589]: https://github.com/rust-lang/rust/pull/40589
5179 [40612]: https://github.com/rust-lang/rust/pull/40612
5180 [40723]: https://github.com/rust-lang/rust/pull/40723
5181 [40728]: https://github.com/rust-lang/rust/pull/40728
5182 [40731]: https://github.com/rust-lang/rust/pull/40731
5183 [40734]: https://github.com/rust-lang/rust/pull/40734
5184 [40805]: https://github.com/rust-lang/rust/pull/40805
5185 [40807]: https://github.com/rust-lang/rust/pull/40807
5186 [40828]: https://github.com/rust-lang/rust/pull/40828
5187 [40870]: https://github.com/rust-lang/rust/pull/40870
5188 [41085]: https://github.com/rust-lang/rust/pull/41085
5189 [41143]: https://github.com/rust-lang/rust/pull/41143
5190 [41168]: https://github.com/rust-lang/rust/pull/41168
5191 [41270]: https://github.com/rust-lang/rust/issues/41270
5192 [41469]: https://github.com/rust-lang/rust/pull/41469
5193 [41805]: https://github.com/rust-lang/rust/issues/41805
5194 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5195 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5196 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5197 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5198 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5199 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5200 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5201 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5202 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5203 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5204 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5205 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5206 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5207 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5210 Version 1.17.0 (2017-04-27)
5211 ===========================
5216 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5217 * [Fields of structs may be initialized without duplicating the field/variable
5218 names][39761]. [RFC 1682]
5219 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5220 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5221 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5222 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5223 `'b`. Soundness fix.
5224 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5225 * [Static variables may contain references to other statics][40027]
5230 * [Exit quickly on only `--emit dep-info`][40336]
5231 * [Make `-C relocation-model` more correctly determine whether the linker
5232 creates a position-independent executable][40245]
5233 * [Add `-C overflow-checks` to directly control whether integer overflow
5235 * [The rustc type checker now checks items on demand instead of in a single
5236 in-order pass][40008]. This is mostly an internal refactoring in support of
5237 future work, including incremental type checking, but also resolves [RFC
5238 1647], allowing `Self` to appear in `impl` `where` clauses.
5239 * [Optimize vtable loads][39995]
5240 * [Turn off vectorization for Emscripten targets][39990]
5241 * [Provide suggestions for unknown macros imported with `use`][39953]
5242 * [Fix ICEs in path resolution][39939]
5243 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5244 * [Add clearer error message using `&str + &str`][39116]
5255 * [`Ordering::then`]
5256 * [`Ordering::then_with`]
5257 * [`BTreeMap::range`]
5258 * [`BTreeMap::range_mut`]
5259 * [`collections::Bound`]
5260 * [`process::abort`]
5261 * [`ptr::read_unaligned`]
5262 * [`ptr::write_unaligned`]
5263 * [`Result::expect_err`]
5266 * [`Cell::into_inner`]
5272 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5273 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5274 * [`String` implements `FromIterator<&char>`][40028]
5275 * `Box` [implements][40009] a number of new conversions:
5276 `From<Box<str>> for String`,
5277 `From<Box<[T]>> for Vec<T>`,
5278 `From<Box<CStr>> for CString`,
5279 `From<Box<OsStr>> for OsString`,
5280 `From<Box<Path>> for PathBuf`,
5281 `Into<Box<str>> for String`,
5282 `Into<Box<[T]>> for Vec<T>`,
5283 `Into<Box<CStr>> for CString`,
5284 `Into<Box<OsStr>> for OsString`,
5285 `Into<Box<Path>> for PathBuf`,
5286 `Default for Box<str>`,
5287 `Default for Box<CStr>`,
5288 `Default for Box<OsStr>`,
5289 `From<&CStr> for Box<CStr>`,
5290 `From<&OsStr> for Box<OsStr>`,
5291 `From<&Path> for Box<Path>`
5292 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5293 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5294 * [Slightly optimize `slice::sort`][39538]
5295 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5296 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5297 `Box<str>` implements `From<&str>`][39438]
5298 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5299 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5300 * [`format!` estimates the needed capacity before writing a string][39356]
5301 * [Support unprivileged symlink creation in Windows][38921]
5302 * [`PathBuf` implements `Default`][38764]
5303 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5304 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5305 and poor hash functions.
5310 * [Add `cargo check --all`][cargo/3731]
5311 * [Add an option to ignore SSL revocation checking][cargo/3699]
5312 * [Add `cargo run --package`][cargo/3691]
5313 * [Add `required_features`][cargo/3667]
5314 * [Assume `build.rs` is a build script][cargo/3664]
5315 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5320 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5322 * [The "Unstable Book" documents nightly-only features][ubook]
5323 * [Improve the style of the sidebar in rustdoc output][40265]
5324 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5325 * [Fix MSP430 breakage due to `i128`][40257]
5326 * [Preliminary Solaris/SPARCv9 support][39903]
5327 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5328 run without installing the MSVC runtime.
5329 * [`rustdoc --test` includes file names in test names][39788]
5330 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5331 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5332 * [Initial support for `aarch64-unknown-freebsd`][39491]
5333 * [Initial support for `i686-unknown-netbsd`][39426]
5334 * [This release no longer includes the old makefile build system][39431]. Rust
5335 is built with a custom build system, written in Rust, and with Cargo.
5336 * [Add Debug implementations for libcollection structs][39002]
5337 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5338 * [`--test-threads=0` produces an error][38945]
5339 * [`rustup` installs documentation by default][40526]
5340 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5341 WinDbg and Visual Studio to improve the debugging experience.
5346 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5347 workaround, either use MSVC 2015 or run vcvars.bat.
5348 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5349 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5350 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5352 * [`format!` and `Display::to_string` panic if an underlying formatting
5353 implementation returns an error][40117]. Previously the error was silently
5354 ignored. It is incorrect for `write_fmt` to return an error when writing
5356 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5357 crates were marked stable and could be accessed from the stable toolchain.
5358 * [Rust git source no longer includes vendored crates][39728]. Those that need
5359 to build with vendored crates should build from release tarballs.
5360 * [Fix inert attributes from `proc_macro_derives`][39572]
5361 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5362 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5364 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5365 existing code generally ignores the type of dead-code unless a type-hint is
5366 provided; this can cause surprising inference interactions particularly around
5367 defaulting. The new code uniformly ignores the result type of dead-code.
5368 * [Tuple-struct constructors with private fields are no longer visible][38932]
5369 * [Lifetime parameters that do not appear in the arguments are now considered
5370 early-bound][38897], resolving a soundness bug (#[32330]). The
5371 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5373 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5374 * [Make transmuting from fn item types to pointer-sized types a hard
5377 [27787]: https://github.com/rust-lang/rust/issues/27787
5378 [32330]: https://github.com/rust-lang/rust/issues/32330
5379 [34198]: https://github.com/rust-lang/rust/pull/34198
5380 [38161]: https://github.com/rust-lang/rust/pull/38161
5381 [38368]: https://github.com/rust-lang/rust/pull/38368
5382 [38584]: https://github.com/rust-lang/rust/issues/38584
5383 [38661]: https://github.com/rust-lang/rust/pull/38661
5384 [38764]: https://github.com/rust-lang/rust/pull/38764
5385 [38864]: https://github.com/rust-lang/rust/issues/38864
5386 [38897]: https://github.com/rust-lang/rust/pull/38897
5387 [38921]: https://github.com/rust-lang/rust/pull/38921
5388 [38932]: https://github.com/rust-lang/rust/pull/38932
5389 [38945]: https://github.com/rust-lang/rust/pull/38945
5390 [38981]: https://github.com/rust-lang/rust/pull/38981
5391 [39002]: https://github.com/rust-lang/rust/pull/39002
5392 [39116]: https://github.com/rust-lang/rust/pull/39116
5393 [39193]: https://github.com/rust-lang/rust/pull/39193
5394 [39265]: https://github.com/rust-lang/rust/pull/39265
5395 [39356]: https://github.com/rust-lang/rust/pull/39356
5396 [39372]: https://github.com/rust-lang/rust/pull/39372
5397 [39426]: https://github.com/rust-lang/rust/pull/39426
5398 [39431]: https://github.com/rust-lang/rust/pull/39431
5399 [39438]: https://github.com/rust-lang/rust/pull/39438
5400 [39440]: https://github.com/rust-lang/rust/pull/39440
5401 [39485]: https://github.com/rust-lang/rust/pull/39485
5402 [39491]: https://github.com/rust-lang/rust/pull/39491
5403 [39518]: https://github.com/rust-lang/rust/pull/39518
5404 [39538]: https://github.com/rust-lang/rust/pull/39538
5405 [39572]: https://github.com/rust-lang/rust/pull/39572
5406 [39633]: https://github.com/rust-lang/rust/pull/39633
5407 [39642]: https://github.com/rust-lang/rust/pull/39642
5408 [39728]: https://github.com/rust-lang/rust/pull/39728
5409 [39761]: https://github.com/rust-lang/rust/pull/39761
5410 [39788]: https://github.com/rust-lang/rust/pull/39788
5411 [39793]: https://github.com/rust-lang/rust/pull/39793
5412 [39837]: https://github.com/rust-lang/rust/pull/39837
5413 [39843]: https://github.com/rust-lang/rust/pull/39843
5414 [39851]: https://github.com/rust-lang/rust/pull/39851
5415 [39903]: https://github.com/rust-lang/rust/pull/39903
5416 [39939]: https://github.com/rust-lang/rust/pull/39939
5417 [39953]: https://github.com/rust-lang/rust/pull/39953
5418 [39960]: https://github.com/rust-lang/rust/pull/39960
5419 [39990]: https://github.com/rust-lang/rust/pull/39990
5420 [39995]: https://github.com/rust-lang/rust/pull/39995
5421 [40008]: https://github.com/rust-lang/rust/pull/40008
5422 [40009]: https://github.com/rust-lang/rust/pull/40009
5423 [40027]: https://github.com/rust-lang/rust/pull/40027
5424 [40028]: https://github.com/rust-lang/rust/pull/40028
5425 [40037]: https://github.com/rust-lang/rust/pull/40037
5426 [40117]: https://github.com/rust-lang/rust/pull/40117
5427 [40166]: https://github.com/rust-lang/rust/pull/40166
5428 [40245]: https://github.com/rust-lang/rust/pull/40245
5429 [40257]: https://github.com/rust-lang/rust/pull/40257
5430 [40261]: https://github.com/rust-lang/rust/pull/40261
5431 [40265]: https://github.com/rust-lang/rust/pull/40265
5432 [40319]: https://github.com/rust-lang/rust/pull/40319
5433 [40336]: https://github.com/rust-lang/rust/pull/40336
5434 [40526]: https://github.com/rust-lang/rust/pull/40526
5435 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5436 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5437 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5438 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5439 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5440 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5441 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5442 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5443 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5444 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5445 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5446 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5447 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5448 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5449 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5450 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5451 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5452 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5453 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5454 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5455 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5456 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5457 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5458 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5459 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5460 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5461 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5462 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5463 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5464 [mdbook]: https://crates.io/crates/mdbook
5465 [ubook]: https://doc.rust-lang.org/unstable-book/
5468 Version 1.16.0 (2017-03-16)
5469 ===========================
5474 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5475 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5476 match patterns][38069]
5477 * [Clean up semantics of `self` in an import list][38313]
5478 * [`Self` may appear in `impl` headers][38920]
5479 * [`Self` may appear in struct expressions][39282]
5484 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5485 a `.rmeta` file containing only crate metadata][38571]. This can be
5486 used by tools like the Rust Language Service to perform
5487 metadata-only builds.
5488 * [Levenshtein based typo suggestions now work in most places, while
5489 previously they worked only for fields and sometimes for local
5490 variables][38927]. Together with the overhaul of "no
5491 resolution"/"unexpected resolution" errors (#[38154]) they result in
5492 large and systematic improvement in resolution diagnostics.
5493 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5495 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5496 * [`rustc` no longer attempts to provide "consider using an explicit
5497 lifetime" suggestions][37057]. They were inaccurate.
5502 * [`VecDeque::truncate`]
5503 * [`VecDeque::resize`]
5504 * [`String::insert_str`]
5505 * [`Duration::checked_add`]
5506 * [`Duration::checked_sub`]
5507 * [`Duration::checked_div`]
5508 * [`Duration::checked_mul`]
5511 * [`SocketAddr::is_ipv4`]
5512 * [`SocketAddr::is_ipv6`]
5513 * [`IpAddr::is_ipv4`]
5514 * [`IpAddr::is_ipv6`]
5516 * [`Vec::dedup_by_key`]
5517 * [`Result::unwrap_or_default`]
5518 * [`<*const T>::wrapping_offset`]
5519 * [`<*mut T>::wrapping_offset`]
5520 * `CommandExt::creation_flags`
5521 * [`File::set_permissions`]
5522 * [`String::split_off`]
5527 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5528 their argument by `Borrow` parameter][37761]
5529 * [All public types in std implement `Debug`][38006]
5530 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5531 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5532 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5534 * [std: Fix partial writes in `LineWriter`][38062]
5535 * [std: Clamp max read/write sizes on Unix][38062]
5536 * [Use more specific panic message for `&str` slicing errors][38066]
5537 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5538 functionality cannot be achieved in std currently.
5539 * [`writeln!`, like `println!`, now accepts a form with no string
5540 or formatting arguments, to just print a newline][38469]
5541 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5542 * [Reduce the size of static data in `std_unicode::tables`][38781]
5543 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5544 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5546 * [`Duration` implements `Sum`][38712]
5547 * [`String` implements `ToSocketAddrs`][39048]
5552 * [The `cargo check` command does a type check of a project without
5553 building it][cargo/3296]
5554 * [crates.io will display CI badges from Travis and AppVeyor, if
5555 specified in Cargo.toml][cargo/3546]
5556 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5557 * [Compilation profiles accept integer values for `debug`, in addition
5558 to `true` and `false`. These are passed to `rustc` as the value to
5559 `-C debuginfo`][cargo/3534]
5560 * [Implement `cargo --version --verbose`][cargo/3604]
5561 * [All builds now output 'dep-info' build dependencies compatible with
5562 make and ninja][cargo/3557]
5563 * [Build all workspace members with `build --all`][cargo/3511]
5564 * [Document all workspace members with `doc --all`][cargo/3515]
5565 * [Path deps outside workspace are not members][cargo/3443]
5570 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5571 the path to the Rust implementation][38589]
5572 * [The `armv7-linux-androideabi` target no longer enables NEON
5573 extensions, per Google's ABI guide][38413]
5574 * [The stock standard library can be compiled for Redox OS][38401]
5575 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5577 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5579 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5584 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5585 match patterns][38069]
5586 * In this release, references to uninhabited types can not be
5587 pattern-matched. This was accidentally allowed in 1.15.
5588 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5589 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5591 * [Clean up semantics of `self` in an import list][38313]
5592 * Reimplemented lifetime elision. This change was almost entirely compatible
5593 with existing code, but it did close a number of small bugs and loopholes,
5594 as well as being more accepting in some other [cases][41105].
5596 [37057]: https://github.com/rust-lang/rust/pull/37057
5597 [37761]: https://github.com/rust-lang/rust/pull/37761
5598 [38006]: https://github.com/rust-lang/rust/pull/38006
5599 [38051]: https://github.com/rust-lang/rust/pull/38051
5600 [38062]: https://github.com/rust-lang/rust/pull/38062
5601 [38062]: https://github.com/rust-lang/rust/pull/38622
5602 [38066]: https://github.com/rust-lang/rust/pull/38066
5603 [38069]: https://github.com/rust-lang/rust/pull/38069
5604 [38131]: https://github.com/rust-lang/rust/pull/38131
5605 [38154]: https://github.com/rust-lang/rust/pull/38154
5606 [38274]: https://github.com/rust-lang/rust/pull/38274
5607 [38304]: https://github.com/rust-lang/rust/pull/38304
5608 [38313]: https://github.com/rust-lang/rust/pull/38313
5609 [38314]: https://github.com/rust-lang/rust/pull/38314
5610 [38327]: https://github.com/rust-lang/rust/pull/38327
5611 [38401]: https://github.com/rust-lang/rust/pull/38401
5612 [38413]: https://github.com/rust-lang/rust/pull/38413
5613 [38469]: https://github.com/rust-lang/rust/pull/38469
5614 [38559]: https://github.com/rust-lang/rust/pull/38559
5615 [38571]: https://github.com/rust-lang/rust/pull/38571
5616 [38580]: https://github.com/rust-lang/rust/pull/38580
5617 [38589]: https://github.com/rust-lang/rust/pull/38589
5618 [38670]: https://github.com/rust-lang/rust/pull/38670
5619 [38712]: https://github.com/rust-lang/rust/pull/38712
5620 [38726]: https://github.com/rust-lang/rust/pull/38726
5621 [38781]: https://github.com/rust-lang/rust/pull/38781
5622 [38798]: https://github.com/rust-lang/rust/pull/38798
5623 [38909]: https://github.com/rust-lang/rust/pull/38909
5624 [38920]: https://github.com/rust-lang/rust/pull/38920
5625 [38927]: https://github.com/rust-lang/rust/pull/38927
5626 [39048]: https://github.com/rust-lang/rust/pull/39048
5627 [39282]: https://github.com/rust-lang/rust/pull/39282
5628 [39379]: https://github.com/rust-lang/rust/pull/39379
5629 [41105]: https://github.com/rust-lang/rust/issues/41105
5630 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5631 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5632 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5633 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5634 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5635 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5636 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5637 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5638 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5639 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5640 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5641 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5642 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5643 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5644 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5645 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5646 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5647 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5648 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5649 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5650 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5651 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5652 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5653 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5654 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5655 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5656 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5657 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5658 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5659 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5662 Version 1.15.1 (2017-02-09)
5663 ===========================
5665 * [Fix IntoIter::as_mut_slice's signature][39466]
5666 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5668 [39466]: https://github.com/rust-lang/rust/pull/39466
5669 [39523]: https://github.com/rust-lang/rust/pull/39523
5672 Version 1.15.0 (2017-02-02)
5673 ===========================
5678 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5679 stable. This allows popular code-generating crates like Serde and Diesel to
5680 work ergonomically. [RFC 1681].
5681 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5682 with curly braces][36868]. Part of [RFC 1506].
5683 * [A number of minor changes to name resolution have been activated][37127].
5684 They add up to more consistent semantics, allowing for future evolution of
5685 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5686 details of what is different. The breaking changes here have been transitioned
5687 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5688 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5690 * [`?Sized` can be used in `where` clauses][37791]
5691 * [There is now a limit on the size of monomorphized types and it can be
5692 modified with the `#![type_size_limit]` crate attribute, similarly to
5693 the `#![recursion_limit]` attribute][37789]
5698 * [On Windows, the compiler will apply dllimport attributes when linking to
5699 extern functions][37973]. Additional attributes and flags can control which
5700 library kind is linked and its name. [RFC 1717].
5701 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5702 * [The `--test` flag works with procedural macro crates][38107]
5703 * [Fix `extern "aapcs" fn` ABI][37814]
5704 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5705 * [The `format!` expander recognizes incorrect `printf` and shell-style
5706 formatting directives and suggests the correct format][37613].
5707 * [Only report one error for all unused imports in an import list][37456]
5709 Compiler Performance
5710 --------------------
5712 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5713 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5714 * [Don't clone in `UnificationTable::probe`][37848]
5715 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5716 * [Use small vectors in type walker][37760]
5717 * [Macro expansion performance was improved][37701]
5718 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5719 * [Replace FNV with a faster hash function][37229]
5724 * [`std::iter::Iterator::min_by`]
5725 * [`std::iter::Iterator::max_by`]
5726 * [`std::os::*::fs::FileExt`]
5727 * [`std::sync::atomic::Atomic*::get_mut`]
5728 * [`std::sync::atomic::Atomic*::into_inner`]
5729 * [`std::vec::IntoIter::as_slice`]
5730 * [`std::vec::IntoIter::as_mut_slice`]
5731 * [`std::sync::mpsc::Receiver::try_iter`]
5732 * [`std::os::unix::process::CommandExt::before_exec`]
5733 * [`std::rc::Rc::strong_count`]
5734 * [`std::rc::Rc::weak_count`]
5735 * [`std::sync::Arc::strong_count`]
5736 * [`std::sync::Arc::weak_count`]
5737 * [`std::char::encode_utf8`]
5738 * [`std::char::encode_utf16`]
5739 * [`std::cell::Ref::clone`]
5740 * [`std::io::Take::into_inner`]
5745 * [The standard sorting algorithm has been rewritten for dramatic performance
5746 improvements][38192]. It is a hybrid merge sort, drawing influences from
5747 Timsort. Previously it was a naive merge sort.
5748 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5749 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5751 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5752 and `char_indices().last()`][37882]
5753 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5754 * [Chinese characters display correctly in `fmt::Debug`][37855]
5755 * [Derive `Default` for `Duration`][37699]
5756 * [Support creation of anonymous pipes on WinXP/2k][37677]
5757 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5758 * [Don't pass overlapped handles to processes][38835]
5763 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5764 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5765 should instead check the variable at runtime with `std::env`. That the value
5766 was set at build time was a bug, and incorrect when cross-compiling. This
5767 change is known to cause breakage.
5768 * [Add `--all` flag to `cargo test`][cargo/3221]
5769 * [Compile statically against the MSVC CRT][cargo/3363]
5770 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5771 * [Link OpenSSL statically on OSX][cargo/3311]
5772 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5773 * [Test for bad path overrides with summaries][cargo/3336]
5774 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5775 * [Fix retrying crate downloads for network errors][cargo/3348]
5776 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5777 * [Emit more info on --message-format=json][cargo/3319]
5778 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5779 * [Don't ignore errors in workspace manifest][cargo/3409]
5780 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5785 * [Test runners (binaries built with `--test`) now support a `--list` argument
5786 that lists the tests it contains][38185]
5787 * [Test runners now support a `--exact` argument that makes the test filter
5788 match exactly, instead of matching only a substring of the test name][38181]
5789 * [rustdoc supports a `--playground-url` flag][37763]
5790 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5795 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5796 continue to be used in this release by passing `--disable-rustbuild` to the
5797 configure script, but they will be deleted soon. Note that the new build
5798 system uses a different on-disk layout that will likely affect any scripts
5800 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5802 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5803 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5809 * [A number of minor changes to name resolution have been activated][37127].
5810 They add up to more consistent semantics, allowing for future evolution of
5811 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5812 details of what is different. The breaking changes here have been transitioned
5813 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5814 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5815 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5816 should instead check the variable at runtime with `std::env`. That the value
5817 was set at build time was a bug, and incorrect when cross-compiling. This
5818 change is known to cause breakage.
5819 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5820 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5821 1.10 and is now an error by default. It will become a hard error in the near
5823 * [The semantics relating modules to file system directories are changing in
5824 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5825 lint, which is a warning in this release, and will become a hard error in the
5827 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5828 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5829 the underlying iterator][37834]
5831 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5832 [33685]: https://github.com/rust-lang/rust/issues/33685
5833 [36868]: https://github.com/rust-lang/rust/pull/36868
5834 [37127]: https://github.com/rust-lang/rust/pull/37127
5835 [37229]: https://github.com/rust-lang/rust/pull/37229
5836 [37456]: https://github.com/rust-lang/rust/pull/37456
5837 [37527]: https://github.com/rust-lang/rust/pull/37527
5838 [37602]: https://github.com/rust-lang/rust/pull/37602
5839 [37613]: https://github.com/rust-lang/rust/pull/37613
5840 [37615]: https://github.com/rust-lang/rust/pull/37615
5841 [37636]: https://github.com/rust-lang/rust/pull/37636
5842 [37627]: https://github.com/rust-lang/rust/pull/37627
5843 [37642]: https://github.com/rust-lang/rust/pull/37642
5844 [37677]: https://github.com/rust-lang/rust/pull/37677
5845 [37699]: https://github.com/rust-lang/rust/pull/37699
5846 [37701]: https://github.com/rust-lang/rust/pull/37701
5847 [37705]: https://github.com/rust-lang/rust/pull/37705
5848 [37749]: https://github.com/rust-lang/rust/pull/37749
5849 [37760]: https://github.com/rust-lang/rust/pull/37760
5850 [37763]: https://github.com/rust-lang/rust/pull/37763
5851 [37764]: https://github.com/rust-lang/rust/pull/37764
5852 [37789]: https://github.com/rust-lang/rust/pull/37789
5853 [37791]: https://github.com/rust-lang/rust/pull/37791
5854 [37814]: https://github.com/rust-lang/rust/pull/37814
5855 [37817]: https://github.com/rust-lang/rust/pull/37817
5856 [37834]: https://github.com/rust-lang/rust/pull/37834
5857 [37848]: https://github.com/rust-lang/rust/pull/37848
5858 [37855]: https://github.com/rust-lang/rust/pull/37855
5859 [37882]: https://github.com/rust-lang/rust/pull/37882
5860 [37888]: https://github.com/rust-lang/rust/pull/37888
5861 [37973]: https://github.com/rust-lang/rust/pull/37973
5862 [37979]: https://github.com/rust-lang/rust/pull/37979
5863 [38086]: https://github.com/rust-lang/rust/pull/38086
5864 [38107]: https://github.com/rust-lang/rust/pull/38107
5865 [38117]: https://github.com/rust-lang/rust/pull/38117
5866 [38134]: https://github.com/rust-lang/rust/pull/38134
5867 [38146]: https://github.com/rust-lang/rust/pull/38146
5868 [38181]: https://github.com/rust-lang/rust/pull/38181
5869 [38182]: https://github.com/rust-lang/rust/pull/38182
5870 [38185]: https://github.com/rust-lang/rust/pull/38185
5871 [38192]: https://github.com/rust-lang/rust/pull/38192
5872 [38279]: https://github.com/rust-lang/rust/pull/38279
5873 [38835]: https://github.com/rust-lang/rust/pull/38835
5874 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5875 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5876 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5877 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5878 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5879 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5880 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5881 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5882 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5883 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5884 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5885 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5886 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5887 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5888 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5889 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5890 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5891 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5892 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5893 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5894 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5895 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5896 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5897 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5898 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5899 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5900 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5901 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5902 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5903 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5904 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5905 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5906 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5907 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5908 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5909 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5910 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5911 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5914 Version 1.14.0 (2016-12-22)
5915 ===========================
5920 * [`..` matches multiple tuple fields in enum variants, structs
5921 and tuples][36843]. [RFC 1492].
5922 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5923 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5924 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5925 dereferencing][36822]
5930 * [Mark enums with non-zero discriminant as non-zero][37224]
5931 * [Lower-case `static mut` names are linted like other
5932 statics and consts][37162]
5933 * [Fix ICE on some macros in const integer positions
5934 (e.g. `[u8; m!()]`)][36819]
5935 * [Improve error message and snippet for "did you mean `x`"][36798]
5936 * [Add a panic-strategy field to the target specification][36794]
5937 * [Include LLVM version in `--version --verbose`][37200]
5939 Compile-time Optimizations
5940 --------------------------
5942 * [Improve macro expansion performance][37569]
5943 * [Shrink `Expr_::ExprInlineAsm`][37445]
5944 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5945 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5946 * [Avoid more allocations when compiling html5ever][37373]
5947 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5948 * [Avoid some allocations in the macro parser][37318]
5949 * [Use a faster deflate setting][37298]
5950 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5951 during interning of slices][37270]
5952 * [Optimize `write_metadata`][37267]
5953 * [Don't process obligation forest cycles when stalled][37231]
5954 * [Avoid many `CrateConfig` clones][37161]
5955 * [Optimize `Substs::super_fold_with`][37108]
5956 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5957 * [Speed up `plug_leaks`][36917]
5962 * [`println!()`, with no arguments, prints newline][36825].
5963 Previously, an empty string was required to achieve the same.
5964 * [`Wrapping` impls standard binary and unary operators, as well as
5965 the `Sum` and `Product` iterators][37356]
5966 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5968 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5969 `VecDeque` iterators][37315]
5970 * [Improve `SipHasher` performance on small values][37312]
5971 * [Add Iterator trait TrustedLen to enable better FromIterator /
5973 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5974 * [`ReadDir` implements `Debug`][37221]
5975 * [Implement `RefUnwindSafe` for atomic types][37178]
5976 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5977 * [Avoid allocations in `Decoder::read_str`][37064]
5978 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5979 * [Impl `Debug` for raw pointers to unsized data][36880]
5980 * [Don't reuse `HashMap` random seeds][37470]
5981 * [The internal memory layout of `HashMap` is more cache-friendly, for
5982 significant improvements in some operations][36692]
5983 * [`HashMap` uses less memory on 32-bit architectures][36595]
5984 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5989 * [Expose rustc cfg values to build scripts][cargo/3243]
5990 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5991 * [Fix passing --features when testing multiple packages][cargo/3280]
5992 * [Use a single profile set per workspace][cargo/3249]
5993 * [Load `replace` sections from lock files][cargo/3220]
5994 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5999 * [rustup is the recommended Rust installation method][1.14rustup]
6000 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6001 S390x. These are [tier 2] platforms and may have major defects. Follow the
6002 instructions on the website to install, or add the targets to an existing
6003 installation with `rustup target add`. The new target triples are:
6004 - `mips-unknown-linux-gnu`
6005 - `mipsel-unknown-linux-gnu`
6006 - `mips64-unknown-linux-gnuabi64`
6007 - `mips64el-unknown-linux-gnuabi64 `
6008 - `powerpc-unknown-linux-gnu`
6009 - `powerpc64-unknown-linux-gnu`
6010 - `powerpc64le-unknown-linux-gnu`
6011 - `s390x-unknown-linux-gnu `
6012 * This release includes target (std) builds for ARM Linux running MUSL
6013 libc. These are [tier 2] platforms and may have major defects. Add the
6014 following triples to an existing rustup installation with `rustup target add`:
6015 - `arm-unknown-linux-musleabi`
6016 - `arm-unknown-linux-musleabihf`
6017 - `armv7-unknown-linux-musleabihf`
6018 * This release includes [experimental support for WebAssembly][1.14wasm], via
6019 the `wasm32-unknown-emscripten` target. This target is known to have major
6020 defects. Please test, report, and fix.
6021 * rustup no longer installs documentation by default. Run `rustup
6022 component add rust-docs` to install.
6023 * [Fix line stepping in debugger][37310]
6024 * [Enable line number debuginfo in releases][37280]
6029 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6030 * [Add support for Fuchsia OS][37313]
6031 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6036 * [A number of forward-compatibility lints used by the compiler
6037 to gradually introduce language changes have been converted
6038 to deny by default][36894]:
6039 - ["use of inaccessible extern crate erroneously allowed"][36886]
6040 - ["type parameter default erroneously allowed in invalid location"][36887]
6041 - ["detects super or self keywords at the beginning of global path"][36888]
6042 - ["two overlapping inherent impls define an item with the same name
6043 were erroneously allowed"][36889]
6044 - ["floating-point constants cannot be used in patterns"][36890]
6045 - ["constants of struct or enum type can only be used in a pattern if
6046 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6047 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6048 * [Prohibit patterns in trait methods without bodies][37378]
6049 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6050 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6051 * [The `$crate` macro variable is accepted in fewer locations][37213]
6052 * [Impls specifying extra region requirements beyond the trait
6053 they implement are rejected][37167]
6054 * [Enums may not be unsized][37111]. Unsized enums are intended to
6055 work but never have. For now they are forbidden.
6056 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6058 [tier 2]: https://forge.rust-lang.org/platform-support.html
6059 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6060 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6061 [36430]: https://github.com/rust-lang/rust/pull/36430
6062 [36595]: https://github.com/rust-lang/rust/pull/36595
6063 [36595]: https://github.com/rust-lang/rust/pull/36595
6064 [36692]: https://github.com/rust-lang/rust/pull/36692
6065 [36767]: https://github.com/rust-lang/rust/pull/36767
6066 [36794]: https://github.com/rust-lang/rust/pull/36794
6067 [36798]: https://github.com/rust-lang/rust/pull/36798
6068 [36819]: https://github.com/rust-lang/rust/pull/36819
6069 [36822]: https://github.com/rust-lang/rust/pull/36822
6070 [36825]: https://github.com/rust-lang/rust/pull/36825
6071 [36843]: https://github.com/rust-lang/rust/pull/36843
6072 [36880]: https://github.com/rust-lang/rust/pull/36880
6073 [36886]: https://github.com/rust-lang/rust/issues/36886
6074 [36887]: https://github.com/rust-lang/rust/issues/36887
6075 [36888]: https://github.com/rust-lang/rust/issues/36888
6076 [36889]: https://github.com/rust-lang/rust/issues/36889
6077 [36890]: https://github.com/rust-lang/rust/issues/36890
6078 [36891]: https://github.com/rust-lang/rust/issues/36891
6079 [36892]: https://github.com/rust-lang/rust/issues/36892
6080 [36894]: https://github.com/rust-lang/rust/pull/36894
6081 [36917]: https://github.com/rust-lang/rust/pull/36917
6082 [36993]: https://github.com/rust-lang/rust/pull/36993
6083 [37037]: https://github.com/rust-lang/rust/pull/37037
6084 [37064]: https://github.com/rust-lang/rust/pull/37064
6085 [37094]: https://github.com/rust-lang/rust/pull/37094
6086 [37108]: https://github.com/rust-lang/rust/pull/37108
6087 [37111]: https://github.com/rust-lang/rust/pull/37111
6088 [37161]: https://github.com/rust-lang/rust/pull/37161
6089 [37162]: https://github.com/rust-lang/rust/pull/37162
6090 [37167]: https://github.com/rust-lang/rust/pull/37167
6091 [37178]: https://github.com/rust-lang/rust/pull/37178
6092 [37200]: https://github.com/rust-lang/rust/pull/37200
6093 [37213]: https://github.com/rust-lang/rust/pull/37213
6094 [37221]: https://github.com/rust-lang/rust/pull/37221
6095 [37224]: https://github.com/rust-lang/rust/pull/37224
6096 [37230]: https://github.com/rust-lang/rust/pull/37230
6097 [37231]: https://github.com/rust-lang/rust/pull/37231
6098 [37247]: https://github.com/rust-lang/rust/pull/37247
6099 [37267]: https://github.com/rust-lang/rust/pull/37267
6100 [37270]: https://github.com/rust-lang/rust/pull/37270
6101 [37273]: https://github.com/rust-lang/rust/pull/37273
6102 [37280]: https://github.com/rust-lang/rust/pull/37280
6103 [37298]: https://github.com/rust-lang/rust/pull/37298
6104 [37306]: https://github.com/rust-lang/rust/pull/37306
6105 [37310]: https://github.com/rust-lang/rust/pull/37310
6106 [37312]: https://github.com/rust-lang/rust/pull/37312
6107 [37313]: https://github.com/rust-lang/rust/pull/37313
6108 [37315]: https://github.com/rust-lang/rust/pull/37315
6109 [37318]: https://github.com/rust-lang/rust/pull/37318
6110 [37322]: https://github.com/rust-lang/rust/pull/37322
6111 [37326]: https://github.com/rust-lang/rust/pull/37326
6112 [37351]: https://github.com/rust-lang/rust/pull/37351
6113 [37356]: https://github.com/rust-lang/rust/pull/37356
6114 [37367]: https://github.com/rust-lang/rust/pull/37367
6115 [37373]: https://github.com/rust-lang/rust/pull/37373
6116 [37378]: https://github.com/rust-lang/rust/pull/37378
6117 [37389]: https://github.com/rust-lang/rust/pull/37389
6118 [37392]: https://github.com/rust-lang/rust/pull/37392
6119 [37427]: https://github.com/rust-lang/rust/pull/37427
6120 [37439]: https://github.com/rust-lang/rust/pull/37439
6121 [37445]: https://github.com/rust-lang/rust/pull/37445
6122 [37470]: https://github.com/rust-lang/rust/pull/37470
6123 [37569]: https://github.com/rust-lang/rust/pull/37569
6124 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6125 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6126 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6127 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6128 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6129 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6130 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6133 Version 1.13.0 (2016-11-10)
6134 ===========================
6139 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6140 errors, like the `try!` macro, described in [RFC 0243].
6141 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6142 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6143 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6144 * [Fix lifetime rules for 'if' conditions][36029]
6145 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6150 * [Add the `-C link-arg` argument][36574]
6151 * [Remove the old AST-based backend from rustc_trans][35764]
6152 * [Don't enable NEON by default on armv7 Linux][35814]
6153 * [Fix debug line number info for macro expansions][35238]
6154 * [Do not emit "class method" debuginfo for types that are not
6155 DICompositeType][36008]
6156 * [Warn about multiple conflicting #[repr] hints][34623]
6157 * [When sizing DST, don't double-count nested struct prefixes][36351]
6158 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6159 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6160 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6161 * [Expand macros without recursing to avoid stack overflows][36214]
6166 * [Replace macro backtraces with labeled local uses][35702]
6167 * [Improve error message for misplaced doc comments][33922]
6168 * [Buffer unix and lock windows to prevent message interleaving][35975]
6169 * [Update lifetime errors to specifically note temporaries][36171]
6170 * [Special case a few colors for Windows][36178]
6171 * [Suggest `use self` when such an import resolves][36289]
6172 * [Be more specific when type parameter shadows primitive type][36338]
6173 * Many minor improvements
6175 Compile-time Optimizations
6176 --------------------------
6178 * [Compute and cache HIR hashes at beginning][35854]
6179 * [Don't hash types in loan paths][36004]
6180 * [Cache projections in trans][35761]
6181 * [Optimize the parser's last token handling][36527]
6182 * [Only instantiate #[inline] functions in codegen units referencing
6183 them][36524]. This leads to big improvements in cases where crates export
6184 define many inline functions without using them directly.
6185 * [Lazily allocate TypedArena's first chunk][36592]
6186 * [Don't allocate during default HashSet creation][36734]
6193 * [`overflowing_abs`]
6194 * [`RefCell::try_borrow`]
6195 * [`RefCell::try_borrow_mut`]
6200 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6201 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6203 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6204 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6205 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6206 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6207 * [Use arc4rand on FreeBSD][35884]
6208 * [memrchr: Correct aligned offset computation][35969]
6209 * [Improve Demangling of Rust Symbols][36059]
6210 * [Use monotonic time in condition variables][35048]
6211 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6212 * [Implement conversion traits for `char`][35755]
6213 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6214 * [Zero first byte of CString on drop][36264]
6215 * [Inherit overflow checks for sum and product][36372]
6216 * [Add missing Eq implementations][36423]
6217 * [Implement `Debug` for `DirEntry`][36631]
6218 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6220 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6221 * [Implement more traits for `std::io::ErrorKind`][35911]
6222 * [Optimize BinaryHeap bounds checking][36072]
6223 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6224 `extend_with_element`][36355]
6225 * [Fix overflow checking in unsigned pow()][34942]
6230 * This release includes security fixes to both curl and OpenSSL.
6231 * [Fix transitive doctests when panic=abort][cargo/3021]
6232 * [Add --all-features flag to cargo][cargo/3038]
6233 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6234 * [Don't parse the home directory more than once][cargo/3078]
6235 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6236 * [Update OpenSSL to 1.0.2j][cargo/3121]
6237 * [Add license and license_file to cargo metadata output][cargo/3110]
6238 * [Make crates-io registry URL optional in config; ignore all changes to
6239 source.crates-io][cargo/3089]
6240 * [Don't download dependencies from other platforms][cargo/3123]
6241 * [Build transitive dev-dependencies when needed][cargo/3125]
6242 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6243 * [Avoid updating registry when adding existing deps][cargo/3144]
6244 * [Warn about path overrides that won't work][cargo/3136]
6245 * [Use workspaces during `cargo install`][cargo/3146]
6246 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6247 * [Add --message-format flag][cargo/3000]
6248 * [Pass target environment for rustdoc][cargo/3205]
6249 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6250 * [Update curl and curl-sys][cargo/3241]
6251 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6256 * [rustdoc: Add the `--sysroot` argument][36586]
6257 * [rustdoc: Fix a couple of issues with the search results][35655]
6258 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6259 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6260 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6265 * [Remove unmaintained style guide][35124]
6266 * [Add s390x support][36369]
6267 * [Initial work at Haiku OS support][36727]
6268 * [Add mips-uclibc targets][35734]
6269 * [Crate-ify compiler-rt into compiler-builtins][35021]
6270 * [Add rustc version info (git hash + date) to dist tarball][36213]
6271 * Many documentation improvements
6276 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6277 * [Deny (by default) transmuting from fn item types to pointer-sized
6278 types][34923]. Continuing the long transition to zero-sized fn items,
6280 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6282 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6283 * [Fix lifetime rules for 'if' conditions][36029].
6284 * [Inherit overflow checks for sum and product][36372].
6285 * [Forbid user-defined macros named "macro_rules"][36730].
6287 [33922]: https://github.com/rust-lang/rust/pull/33922
6288 [34623]: https://github.com/rust-lang/rust/pull/34623
6289 [34923]: https://github.com/rust-lang/rust/pull/34923
6290 [34942]: https://github.com/rust-lang/rust/pull/34942
6291 [34982]: https://github.com/rust-lang/rust/pull/34982
6292 [35021]: https://github.com/rust-lang/rust/pull/35021
6293 [35048]: https://github.com/rust-lang/rust/pull/35048
6294 [35074]: https://github.com/rust-lang/rust/pull/35074
6295 [35124]: https://github.com/rust-lang/rust/pull/35124
6296 [35234]: https://github.com/rust-lang/rust/pull/35234
6297 [35238]: https://github.com/rust-lang/rust/pull/35238
6298 [35354]: https://github.com/rust-lang/rust/pull/35354
6299 [35559]: https://github.com/rust-lang/rust/pull/35559
6300 [35585]: https://github.com/rust-lang/rust/pull/35585
6301 [35627]: https://github.com/rust-lang/rust/pull/35627
6302 [35655]: https://github.com/rust-lang/rust/pull/35655
6303 [35702]: https://github.com/rust-lang/rust/pull/35702
6304 [35707]: https://github.com/rust-lang/rust/pull/35707
6305 [35728]: https://github.com/rust-lang/rust/pull/35728
6306 [35734]: https://github.com/rust-lang/rust/pull/35734
6307 [35755]: https://github.com/rust-lang/rust/pull/35755
6308 [35761]: https://github.com/rust-lang/rust/pull/35761
6309 [35764]: https://github.com/rust-lang/rust/pull/35764
6310 [35814]: https://github.com/rust-lang/rust/pull/35814
6311 [35854]: https://github.com/rust-lang/rust/pull/35854
6312 [35871]: https://github.com/rust-lang/rust/pull/35871
6313 [35884]: https://github.com/rust-lang/rust/pull/35884
6314 [35911]: https://github.com/rust-lang/rust/pull/35911
6315 [35969]: https://github.com/rust-lang/rust/pull/35969
6316 [35975]: https://github.com/rust-lang/rust/pull/35975
6317 [36004]: https://github.com/rust-lang/rust/pull/36004
6318 [36008]: https://github.com/rust-lang/rust/pull/36008
6319 [36014]: https://github.com/rust-lang/rust/pull/36014
6320 [36029]: https://github.com/rust-lang/rust/pull/36029
6321 [36059]: https://github.com/rust-lang/rust/pull/36059
6322 [36072]: https://github.com/rust-lang/rust/pull/36072
6323 [36101]: https://github.com/rust-lang/rust/pull/36101
6324 [36104]: https://github.com/rust-lang/rust/pull/36104
6325 [36171]: https://github.com/rust-lang/rust/pull/36171
6326 [36173]: https://github.com/rust-lang/rust/pull/36173
6327 [36178]: https://github.com/rust-lang/rust/pull/36178
6328 [36213]: https://github.com/rust-lang/rust/pull/36213
6329 [36214]: https://github.com/rust-lang/rust/pull/36214
6330 [36264]: https://github.com/rust-lang/rust/pull/36264
6331 [36266]: https://github.com/rust-lang/rust/pull/36266
6332 [36289]: https://github.com/rust-lang/rust/pull/36289
6333 [36338]: https://github.com/rust-lang/rust/pull/36338
6334 [36351]: https://github.com/rust-lang/rust/pull/36351
6335 [36355]: https://github.com/rust-lang/rust/pull/36355
6336 [36369]: https://github.com/rust-lang/rust/pull/36369
6337 [36372]: https://github.com/rust-lang/rust/pull/36372
6338 [36423]: https://github.com/rust-lang/rust/pull/36423
6339 [36482]: https://github.com/rust-lang/rust/pull/36482
6340 [36505]: https://github.com/rust-lang/rust/pull/36505
6341 [36524]: https://github.com/rust-lang/rust/pull/36524
6342 [36527]: https://github.com/rust-lang/rust/pull/36527
6343 [36551]: https://github.com/rust-lang/rust/pull/36551
6344 [36574]: https://github.com/rust-lang/rust/pull/36574
6345 [36586]: https://github.com/rust-lang/rust/pull/36586
6346 [36592]: https://github.com/rust-lang/rust/pull/36592
6347 [36631]: https://github.com/rust-lang/rust/pull/36631
6348 [36639]: https://github.com/rust-lang/rust/pull/36639
6349 [36721]: https://github.com/rust-lang/rust/pull/36721
6350 [36727]: https://github.com/rust-lang/rust/pull/36727
6351 [36730]: https://github.com/rust-lang/rust/pull/36730
6352 [36734]: https://github.com/rust-lang/rust/pull/36734
6353 [36754]: https://github.com/rust-lang/rust/pull/36754
6354 [36995]: https://github.com/rust-lang/rust/pull/36995
6355 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6356 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6357 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6358 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6359 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6360 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6361 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6362 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6363 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6364 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6365 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6366 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6367 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6368 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6369 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6370 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6371 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6372 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6373 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6374 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6375 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6376 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6377 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6378 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6379 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6380 [rustup]: https://www.rustup.rs
6381 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6382 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6383 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6384 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6385 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6386 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6387 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6390 Version 1.12.1 (2016-10-20)
6391 ===========================
6396 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6397 * [Confusion with double negation and booleans][36856]
6398 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6399 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6400 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6401 * [Corrupted memory after updated to 1.12][36936]
6402 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6403 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6404 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6406 [36381]: https://github.com/rust-lang/rust/issues/36381
6407 [36856]: https://github.com/rust-lang/rust/issues/36856
6408 [36875]: https://github.com/rust-lang/rust/issues/36875
6409 [36924]: https://github.com/rust-lang/rust/issues/36924
6410 [36926]: https://github.com/rust-lang/rust/issues/36926
6411 [36936]: https://github.com/rust-lang/rust/issues/36936
6412 [37026]: https://github.com/rust-lang/rust/issues/37026
6413 [37112]: https://github.com/rust-lang/rust/issues/37112
6414 [37153]: https://github.com/rust-lang/rust/issues/37153
6417 Version 1.12.0 (2016-09-29)
6418 ===========================
6423 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6424 This translation pass is far simpler than the previous AST->LLVM pass, and
6425 creates opportunities to perform new optimizations directly on the MIR. It
6426 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6427 * [`rustc` presents a new, more readable error format, along with
6428 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6429 Most common editors supporting Rust have been updated to work with it. It was
6430 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6435 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6436 This translation pass is far simpler than the previous AST->LLVM pass, and
6437 creates opportunities to perform new optimizations directly on the MIR. It
6438 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6439 * [Print the Rust target name, not the LLVM target name, with
6440 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6441 * [The computation of `TypeId` is correct in some cases where it was previously
6442 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6443 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6444 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6445 `--print relocation-models`, and `--print code-models` print the available
6446 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6447 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6448 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6449 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6450 These targets produce statically-linked binaries. There are no binary release
6456 * [`rustc` presents a new, more readable error format, along with
6457 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6458 Most common editors supporting Rust have been updated to work with it. It was
6459 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6460 * [In error descriptions, references are now described in plain English,
6461 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6462 * [In error type descriptions, unknown numeric types are named `{integer}` or
6463 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6464 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6469 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6470 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6471 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6472 useful](https://github.com/rust-lang/rust/pull/34908)
6473 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6474 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6475 * [Semicolons are properly required as statement delimiters inside
6476 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6477 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6482 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6483 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6484 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6485 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6486 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6487 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6488 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6489 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6490 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6491 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6492 Both on Unix and Windows.
6493 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6494 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6495 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6496 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6497 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6498 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6499 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6500 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6505 * [The `format!` macro and friends now allow a single argument to be formatted
6506 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6507 * [The lifetime bounds on `[T]::binary_search_by` and
6508 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6509 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6510 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6511 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6512 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6513 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6514 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6515 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6516 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6517 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6518 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6519 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6520 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6521 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6522 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6523 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6524 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6525 * [`mpsc::sync_channel` `Receiver`s return any available message before
6526 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6527 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6528 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6533 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6534 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6535 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6536 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6537 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6538 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6539 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6540 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6541 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6542 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6543 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6544 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6545 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6546 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6547 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6548 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6553 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6554 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6559 * [Test binaries now support a `--test-threads` argument to specify the number
6560 of threads used to run tests, and which acts the same as the
6561 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6562 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6563 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6564 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6565 * [Rust releases now come with source packages that can be installed by rustup
6566 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6567 The resulting source code can be used by tools and IDES, located in the
6568 sysroot under `lib/rustlib/src`.
6573 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6574 * Many minor improvements to the documentation.
6575 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6580 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6581 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6582 * [When formatting strings, if "precision" is specified, the "fill",
6583 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6584 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6587 Version 1.11.0 (2016-08-18)
6588 ===========================
6593 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6594 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6595 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6596 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6601 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6602 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6603 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6604 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6605 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6606 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6607 (in libcore - previously stabilized in libstd)
6608 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6609 (in libcore - previously stabilized in libstd)
6610 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6611 (in libcore - previously stabilized in libstd)
6612 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6613 (in libcore - previously stabilized in libstd)
6614 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6615 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6616 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6617 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6622 * [The `thread_local!` macro supports multiple definitions in a single
6623 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6624 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6625 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6626 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6627 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6628 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6629 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6630 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6635 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6636 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6637 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6638 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6639 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6640 and `-vv` prints warnings for all crates.
6641 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6642 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6643 This provides room for expansion by arbitrary tools.
6644 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6645 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6646 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6647 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6648 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6649 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6650 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6655 * [Caching projections speeds up type check dramatically for some
6656 workloads](https://github.com/rust-lang/rust/pull/33816)
6657 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6658 This hasher is faster, but is believed to provide sufficient
6659 protection from collision attacks.
6660 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6665 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6666 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6667 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6668 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6669 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6674 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6675 * [When emitting debug info, rustc emits frame pointers for closures,
6676 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6677 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6678 * Many more errors have been given error codes and extended
6680 * API documentation continues to be improved, with many new examples
6685 * [rustc no longer hangs when dependencies recursively re-export
6686 submodules](https://github.com/rust-lang/rust/pull/34542)
6687 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6688 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6689 rewritten](https://github.com/rust-lang/rust/pull/33895)
6690 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6691 No targets use this yet, but it works toward AVR support.
6696 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6697 * [The new follow-set rules that place restrictions on `macro_rules!`
6698 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6699 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6700 and has been a warning since 1.10.
6701 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6702 This causes breakage in some corner cases.
6705 Version 1.10.0 (2016-07-07)
6706 ===========================
6711 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6712 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6713 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6714 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6715 * [`panic!` can be converted to a runtime abort with the
6716 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6717 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6718 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6719 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6720 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6721 Note that Cargo does not yet directly support cdylibs.
6726 * `os::windows::fs::OpenOptionsExt::access_mode`
6727 * `os::windows::fs::OpenOptionsExt::share_mode`
6728 * `os::windows::fs::OpenOptionsExt::custom_flags`
6729 * `os::windows::fs::OpenOptionsExt::attributes`
6730 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6731 * `os::unix::fs::OpenOptionsExt::custom_flags`
6732 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6733 * `Default for sync::Weak`
6734 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6735 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6736 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6737 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6738 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6739 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6740 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6741 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6742 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6743 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6744 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6745 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6746 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6747 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6748 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6749 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6750 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6751 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6752 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6753 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6754 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6755 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6756 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6757 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6758 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6759 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6760 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6761 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6762 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6763 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6764 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6765 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6766 * Read/Write/RawFd impls for `UnixStream`
6767 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6768 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6769 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6770 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6771 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6772 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6773 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6774 * RawFd impls for `UnixListener`
6775 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6776 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6777 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6778 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6779 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6780 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6781 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6782 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6783 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6784 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6785 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6786 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6787 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6788 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6789 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6790 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6791 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6792 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6793 * RawFd impls for `UnixDatagram`
6794 * `{BTree,Hash}Map::values_mut`
6795 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6800 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6801 The semantics of this minor method are subtle and probably not what
6803 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6804 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6805 will fall back to `/dev/urandom` temporarily to avoid blocking
6806 during early boot](https://github.com/rust-lang/rust/pull/33086).
6807 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6808 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6809 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6810 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6811 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6812 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6813 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6817 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6818 This controls the runtime behavior of the `panic!` macro
6819 and can be either "unwind" (the default), or "abort".
6820 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6821 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6822 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6823 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6824 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6825 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6826 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6827 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6828 By default they are retried twice, which can be customized with the
6829 `net.retry` value in `.cargo/config`.
6830 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6831 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6832 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6833 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6834 Makes it possible to install multiple crates in parallel.
6835 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6836 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6837 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6838 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6839 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6840 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6845 * [rustc memory usage was reduced by refactoring the context used for
6846 type checking](https://github.com/rust-lang/rust/pull/33425).
6847 * [Speed up creation of `HashMap`s by caching the random keys used
6848 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6849 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6850 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6851 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6852 10x faster than the previous lookup tables.
6853 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6858 * Many incremental improvements to documentation and rustdoc.
6859 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6860 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6861 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6862 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6863 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6864 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6865 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6870 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6871 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6872 * [`std` no longer prints backtraces on platforms where the running
6873 module must be loaded with `env::current_exe`, which can't be relied
6874 on](https://github.com/rust-lang/rust/pull/33554).
6875 * This release includes std binaries for the i586-unknown-linux-gnu,
6876 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6877 i586 target is for old x86 hardware without SSE2, and the armv7
6878 target is for Android running on modern ARM architectures.
6879 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6880 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6881 * [On Unix the runtime aborts by calling `libc::abort` instead of
6882 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6883 * [Rust is now bootstrapped from the previous release of Rust,
6884 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6889 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6890 * [`target_env` for Linux ARM targets is just `gnu`, not
6891 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6892 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6893 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6894 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6895 Affects how macros are parsed.
6896 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6897 * [Feature-gated attributes on macro-generated macro invocations are
6898 now rejected](https://github.com/rust-lang/rust/pull/32791).
6899 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6900 This caused some minor changes to type inference.
6903 Version 1.9.0 (2016-05-26)
6904 ==========================
6909 * The `#[deprecated]` attribute when applied to an API will generate
6910 warnings when used. The warnings may be suppressed with
6911 `#[allow(deprecated)]`. [RFC 1270].
6912 * [`fn` item types are zero sized, and each `fn` names a unique
6913 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6914 `transmute` on a `fn` type will generate a warning for a few cycles,
6915 then will be converted to an error.
6916 * [Field and method resolution understand visibility, so private
6917 fields and methods cannot prevent the proper use of public fields
6918 and methods][1.9fv].
6919 * [The parser considers unicode codepoints in the
6920 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6926 * [`std::panic::catch_unwind`] (renamed from `recover`)
6927 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6928 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6929 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6930 * [`str::is_char_boundary`]
6931 * [`<*const T>::as_ref`]
6932 * [`<*mut T>::as_ref`]
6933 * [`<*mut T>::as_mut`]
6934 * [`AsciiExt::make_ascii_uppercase`]
6935 * [`AsciiExt::make_ascii_lowercase`]
6936 * [`char::decode_utf16`]
6937 * [`char::DecodeUtf16`]
6938 * [`char::DecodeUtf16Error`]
6939 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6940 * [`BTreeSet::take`]
6941 * [`BTreeSet::replace`]
6944 * [`HashSet::replace`]
6946 * [`OsString::with_capacity`]
6947 * [`OsString::clear`]
6948 * [`OsString::capacity`]
6949 * [`OsString::reserve`]
6950 * [`OsString::reserve_exact`]
6951 * [`OsStr::is_empty`]
6953 * [`std::os::unix::thread`]
6956 * [`JoinHandleExt::as_pthread_t`]
6957 * [`JoinHandleExt::into_pthread_t`]
6958 * [`HashSet::hasher`]
6959 * [`HashMap::hasher`]
6960 * [`CommandExt::exec`]
6961 * [`File::try_clone`]
6962 * [`SocketAddr::set_ip`]
6963 * [`SocketAddr::set_port`]
6964 * [`SocketAddrV4::set_ip`]
6965 * [`SocketAddrV4::set_port`]
6966 * [`SocketAddrV6::set_ip`]
6967 * [`SocketAddrV6::set_port`]
6968 * [`SocketAddrV6::set_flowinfo`]
6969 * [`SocketAddrV6::set_scope_id`]
6970 * [`slice::copy_from_slice`]
6971 * [`ptr::read_volatile`]
6972 * [`ptr::write_volatile`]
6973 * [`OpenOptions::create_new`]
6974 * [`TcpStream::set_nodelay`]
6975 * [`TcpStream::nodelay`]
6976 * [`TcpStream::set_ttl`]
6977 * [`TcpStream::ttl`]
6978 * [`TcpStream::set_only_v6`]
6979 * [`TcpStream::only_v6`]
6980 * [`TcpStream::take_error`]
6981 * [`TcpStream::set_nonblocking`]
6982 * [`TcpListener::set_ttl`]
6983 * [`TcpListener::ttl`]
6984 * [`TcpListener::set_only_v6`]
6985 * [`TcpListener::only_v6`]
6986 * [`TcpListener::take_error`]
6987 * [`TcpListener::set_nonblocking`]
6988 * [`UdpSocket::set_broadcast`]
6989 * [`UdpSocket::broadcast`]
6990 * [`UdpSocket::set_multicast_loop_v4`]
6991 * [`UdpSocket::multicast_loop_v4`]
6992 * [`UdpSocket::set_multicast_ttl_v4`]
6993 * [`UdpSocket::multicast_ttl_v4`]
6994 * [`UdpSocket::set_multicast_loop_v6`]
6995 * [`UdpSocket::multicast_loop_v6`]
6996 * [`UdpSocket::set_multicast_ttl_v6`]
6997 * [`UdpSocket::multicast_ttl_v6`]
6998 * [`UdpSocket::set_ttl`]
6999 * [`UdpSocket::ttl`]
7000 * [`UdpSocket::set_only_v6`]
7001 * [`UdpSocket::only_v6`]
7002 * [`UdpSocket::join_multicast_v4`]
7003 * [`UdpSocket::join_multicast_v6`]
7004 * [`UdpSocket::leave_multicast_v4`]
7005 * [`UdpSocket::leave_multicast_v6`]
7006 * [`UdpSocket::take_error`]
7007 * [`UdpSocket::connect`]
7008 * [`UdpSocket::send`]
7009 * [`UdpSocket::recv`]
7010 * [`UdpSocket::set_nonblocking`]
7015 * [`std::sync::Once` is poisoned if its initialization function
7017 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7018 * [Most types implement `fmt::Debug`][1.9db].
7019 * [The default buffer size used by `BufReader` and `BufWriter` was
7020 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7021 used by other languages.
7022 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7023 `Duration` additionally implements `*=` and `/=`][1.9ta].
7024 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7025 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7026 * [`Chain` implements `BufRead`][1.9ch].
7027 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7032 * [Cargo can now run concurrently][1.9cc].
7033 * [Top-level overrides allow specific revisions of crates to be
7034 overridden through the entire crate graph][1.9ct]. This is intended
7035 to make upgrades easier for large projects, by allowing crates to be
7036 forked temporarily until they've been upgraded and republished.
7037 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7038 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7039 on the commandline][1.9cf]. `rustc` arguments can also be specified
7040 in the `build.rustflags` configuration key.
7045 * [The time complexity of comparing variables for equivalence during type
7046 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7047 to major compilation time improvement in some scenarios.
7048 * [`ToString` is specialized for `str`, giving it the same performance
7049 as `to_owned`][1.9ts].
7050 * [Spawning processes with `Command::output` no longer creates extra
7052 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7053 for C-like enums][1.9cl].
7058 * [Passing the `--quiet` flag to a test runner will produce
7059 much-abbreviated output][1.9q].
7060 * The Rust Project now publishes std binaries for the
7061 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7062 `i586-pc-windows-msvc` targets.
7067 * [`std::sync::Once` is poisoned if its initialization function
7069 * [It is illegal to define methods with the same name in overlapping
7070 inherent `impl` blocks][1.9sn].
7071 * [`fn` item types are zero sized, and each `fn` names a unique
7072 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7073 `transmute` on a `fn` type will generate a warning for a few cycles,
7074 then will be converted to an error.
7075 * [Improvements to const evaluation may trigger new errors when integer
7076 literals are out of range][1.9ce].
7079 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7080 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7081 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7082 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7083 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7084 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7085 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7086 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7087 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7088 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7089 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7090 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7091 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7092 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7093 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7094 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7095 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7096 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7097 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7098 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7099 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7100 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7101 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7102 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7103 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7104 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7105 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7106 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7107 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7108 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7109 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7110 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7111 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7112 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7113 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7114 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7115 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7116 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7117 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7118 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7119 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7120 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7121 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7122 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7123 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7124 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7125 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7126 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7127 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7128 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7129 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7130 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7131 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7132 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7133 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7134 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7135 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7136 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7137 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7138 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7139 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7140 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7141 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7142 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7143 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7144 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7145 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7146 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7147 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7148 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7149 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7150 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7151 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7152 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7153 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7154 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7155 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7156 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7157 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7158 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7159 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7160 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7161 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7162 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7163 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7164 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7165 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7166 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7167 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7168 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7169 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7170 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7171 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7172 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7173 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7174 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7175 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7176 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7177 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7178 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7179 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7180 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7181 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7182 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7183 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7184 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7185 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7186 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7187 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7188 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7191 Version 1.8.0 (2016-04-14)
7192 ==========================
7197 * Rust supports overloading of compound assignment statements like
7198 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7199 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7200 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7202 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7203 addition to the non-braced form, `struct Foo;`. [RFC 218].
7209 * [`str::encode_utf16`] (renamed from `utf16_units`)
7210 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7213 * [`ptr::drop_in_place`]
7215 * [`time::SystemTime`]
7217 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7218 * [`Instant::elapsed`]
7219 * [`SystemTime::now`]
7220 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7221 * [`SystemTime::elapsed`]
7222 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7223 * [`SystemTimeError`]
7224 * [`SystemTimeError::duration`]
7225 * Various impls for `SystemTimeError`
7227 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7228 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7229 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7230 * [The `write!` and `writeln!` macros correctly emit errors if any of
7231 their arguments can't be formatted][1.8w].
7232 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7233 * [The Unix-specific `raw` modules, which contain a number of
7234 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7235 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7236 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7237 across platforms was making it difficult to implement `std`
7238 correctly. Those that need these definitions should use the `libc`
7240 * The Unix-specific `MetadataExt` traits, including
7241 `os::unix::fs::MetadataExt`, which expose values such as inode
7242 numbers [no longer return platform-specific types][1.8r], but
7243 instead return widened integers. [RFC 1415].
7244 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7245 * [Atomic loads and stores are not volatile][1.8a].
7246 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7251 * [Inlining hash functions lead to a 3% compile-time improvement in
7252 some workloads][1.8h].
7253 * When using jemalloc, its symbols are [unprefixed so that it
7254 overrides the libc malloc implementation][1.8h]. This means that for
7255 rustc, LLVM is now using jemalloc, which results in a 6%
7256 compile-time improvement on a specific workload.
7257 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7262 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7263 i686-pc-windows-msvc is now considered a tier-1 platform.
7264 * [The `--print targets` flag prints a list of supported targets][1.8t].
7265 * [The `--print cfg` flag prints the `cfg`s defined for the current
7267 * [`rustc` can be built with an new Cargo-based build system, written
7268 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7269 build system. To enable it configure with `configure --rustbuild`.
7270 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7271 variants while also indicating the total number of missing variants
7272 if more than 3][1.8m].
7273 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7274 * The Rust Project now publishes binary releases of the standard
7275 library for a number of tier-2 targets:
7276 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7277 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7278 `x86_64-rumprun-netbsd`. These can be installed with
7279 tools such as [multirust][1.8mr].
7284 * [`cargo init` creates a new Cargo project in the current
7285 directory][1.8ci]. It is otherwise like `cargo new`.
7286 * [Cargo has configuration keys for `-v` and
7287 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7288 `[term]` section of `.cargo/config`.
7289 * [Configuration keys that evaluate to strings or integers can be set
7290 via environment variables][1.8ce]. For example the `build.jobs` key
7291 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7292 precedence over config files.
7293 * [Target-specific dependencies support Rust `cfg` syntax for
7294 describing targets][1.8cfg] so that dependencies for multiple
7295 targets can be specified together. [RFC 1361].
7296 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7297 `RUSTDOC` take precedence over the `build.target-dir`,
7298 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7299 * [The child process tree is killed on Windows when Cargo is
7301 * [The `build.target` configuration value sets the target platform,
7302 like `--target`][1.8ct].
7307 * [Unstable compiler flags have been further restricted][1.8u]. Since
7308 1.0 `-Z` flags have been considered unstable, and other flags that
7309 were considered unstable additionally required passing `-Z
7310 unstable-options` to access. Unlike unstable language and library
7311 features though, these options have been accessible on the stable
7312 release channel. Going forward, *new unstable flags will not be
7313 available on the stable release channel*, and old unstable flags
7314 will warn about their usage. In the future, all unstable flags will
7315 be unavailable on the stable release channel.
7316 * [It is no longer possible to `match` on empty enum variants using
7317 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7318 * The Unix-specific `MetadataExt` traits, including
7319 `os::unix::fs::MetadataExt`, which expose values such as inode
7320 numbers [no longer return platform-specific types][1.8r], but
7321 instead return widened integers. [RFC 1415].
7322 * [Modules sourced from the filesystem cannot appear within arbitrary
7323 blocks, but only within other modules][1.8mf].
7324 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7325 * On Unix, [stack overflow triggers a runtime abort instead of a
7327 * [`Command::spawn` and its equivalents return an error if any of
7328 its command-line arguments contain interior `NUL`s][1.8n].
7329 * [Tuple and unit enum variants from other crates are in the type
7331 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7332 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7333 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7334 instead of `foo.lib`.
7337 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7338 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7339 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7340 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7341 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7342 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7343 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7344 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7345 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7346 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7347 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7348 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7349 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7350 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7351 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7352 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7353 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7354 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7355 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7356 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7357 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7358 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7359 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7360 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7361 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7362 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7363 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7364 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7365 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7366 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7367 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7368 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7369 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7370 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7371 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7372 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7373 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7374 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7375 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7376 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7377 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7378 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7379 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7380 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7381 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7382 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7383 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7384 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7385 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7386 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7387 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7388 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7389 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7390 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7391 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7392 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7393 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7394 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7395 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7396 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7399 Version 1.7.0 (2016-03-03)
7400 ==========================
7407 * [`Path::strip_prefix`] (renamed from relative_from)
7408 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7410 * [`Ipv4Addr::is_loopback`]
7411 * [`Ipv4Addr::is_private`]
7412 * [`Ipv4Addr::is_link_local`]
7413 * [`Ipv4Addr::is_multicast`]
7414 * [`Ipv4Addr::is_broadcast`]
7415 * [`Ipv4Addr::is_documentation`]
7417 * [`Ipv6Addr::is_unspecified`]
7418 * [`Ipv6Addr::is_loopback`]
7419 * [`Ipv6Addr::is_multicast`]
7422 * [`Vec::as_mut_slice`]
7424 * [`String::as_str`]
7425 * [`String::as_mut_str`]
7427 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7429 * `<[T]>::`[`sort_by_key`]
7430 * checked, saturated, and overflowing operations
7431 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7432 * [`i32::saturating_mul`]
7433 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7434 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7435 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7436 * [`u32::saturating_mul`]
7437 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7438 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7439 * and checked, saturated, and overflowing operations for other primitive types
7441 * [`ffi::IntoStringError`]
7442 * [`CString::into_string`]
7443 * [`CString::into_bytes`]
7444 * [`CString::into_bytes_with_nul`]
7445 * `From<CString> for Vec<u8>`
7447 * [`IntoStringError::into_cstring`]
7448 * [`IntoStringError::utf8_error`]
7449 * `Error for IntoStringError`
7451 * [`std::hash::BuildHasher`]
7452 * [`BuildHasher::Hasher`]
7453 * [`BuildHasher::build_hasher`]
7454 * [`std::hash::BuildHasherDefault`]
7455 * [`HashMap::with_hasher`]
7456 * [`HashMap::with_capacity_and_hasher`]
7457 * [`HashSet::with_hasher`]
7458 * [`HashSet::with_capacity_and_hasher`]
7459 * [`std::collections::hash_map::RandomState`]
7460 * [`RandomState::new`]
7461 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7462 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7463 from bytes is faster.
7464 * [The performance of `LineWriter` (and thus `io::stdout`) was
7465 improved by using `memchr` to search for newlines][1.7m].
7466 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7467 `f64` variants were stabilized previously.
7468 * [`BTreeMap` was rewritten to use less memory and improve the performance
7469 of insertion and iteration, the latter by as much as 5x][1.7bm].
7470 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7471 covariant over their contained type][1.7bt].
7472 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7473 over their contained type][1.7ll].
7474 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7476 * [`Any` is implemented for unsized types][1.7a].
7477 * [`Hash` is implemented for `Duration`][1.7h].
7482 * [When running tests with `--test`, rustdoc will pass `--cfg`
7483 arguments to the compiler][1.7dt].
7484 * [The compiler is built with RPATH information by default][1.7rpa].
7485 This means that it will be possible to run `rustc` when installed in
7486 unusual configurations without configuring the dynamic linker search
7488 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7489 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7490 over `LD_LIBRARY_PATH`.
7495 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7496 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7497 * [The `rerun-if-changed` build script directive no longer causes the
7498 build script to incorrectly run twice in certain scenarios][1.7rr].
7503 * Soundness fixes to the interactions between associated types and
7504 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7505 code that violates the new rules. This is a significant change that
7506 is known to break existing code, so it has emitted warnings for the
7507 new error cases since 1.4 to give crate authors time to adapt. The
7508 details of what is changing are subtle; read the RFC for more.
7509 * [Several bugs in the compiler's visibility calculations were
7510 fixed][1.7v]. Since this was found to break significant amounts of
7511 code, the new errors will be emitted as warnings for several release
7512 cycles, under the `private_in_public` lint.
7513 * Defaulted type parameters were accidentally accepted in positions
7514 that were not intended. In this release, [defaulted type parameters
7515 appearing outside of type definitions will generate a
7516 warning][1.7d], which will become an error in future releases.
7517 * [Parsing "." as a float results in an error instead of 0][1.7p].
7518 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7519 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7521 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7522 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7523 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7524 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7525 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7526 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7527 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7528 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7529 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7530 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7531 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7532 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7533 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7534 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7535 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7536 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7537 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7538 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7539 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7540 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7541 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7542 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7543 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7544 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7545 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7546 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7547 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7548 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7549 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7550 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7551 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7552 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7553 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7554 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7555 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7556 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7557 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7558 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7559 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7560 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7561 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7562 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7563 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7564 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7565 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7566 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7567 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7568 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7569 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7570 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7571 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7572 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7573 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7574 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7575 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7576 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7577 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7578 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7579 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7580 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7581 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7582 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7583 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7584 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7585 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7586 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7587 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7588 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7589 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7590 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7591 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7592 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7593 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7594 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7595 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7596 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7597 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7598 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7599 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7602 Version 1.6.0 (2016-01-21)
7603 ==========================
7608 * The `#![no_std]` attribute causes a crate to not be linked to the
7609 standard library, but only the [core library][1.6co], as described
7610 in [RFC 1184]. The core library defines common types and traits but
7611 has no platform dependencies whatsoever, and is the basis for Rust
7612 software in environments that cannot support a full port of the
7613 standard library, such as operating systems. Most of the core
7614 library is now stable.
7620 [`Read::read_exact`],
7621 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7622 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7623 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7624 [`os::unix::fs::DirBuilderExt`],
7625 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7626 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7627 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7628 [`collections::hash_map::Drain`],
7629 [`collections::hash_map::HashMap::drain`],
7630 [`collections::hash_set::Drain`],
7631 [`collections::hash_set::HashSet::drain`],
7632 [`collections::binary_heap::Drain`],
7633 [`collections::binary_heap::BinaryHeap::drain`],
7634 [`Vec::extend_from_slice`] (renamed from `push_all`),
7635 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7636 [`RwLock::into_inner`],
7637 [`Iterator::min_by_key`] (renamed from `min_by`),
7638 [`Iterator::max_by_key`] (renamed from `max_by`).
7639 * The [core library][1.6co] is stable, as are most of its APIs.
7640 * [The `assert_eq!` macro supports arguments that don't implement
7641 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7643 * Several timer functions that take duration in milliseconds [are
7644 deprecated in favor of those that take `Duration`][1.6ms]. These
7645 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7646 `thread::park_timeout_ms`.
7647 * The algorithm by which `Vec` reserves additional elements was
7648 [tweaked to not allocate excessive space][1.6a] while still growing
7650 * `From` conversions are [implemented from integers to floats][1.6f]
7651 in cases where the conversion is lossless. Thus they are not
7652 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7653 or `f64`. They are also not implemented for `isize` and `usize`
7654 because the implementations would be platform-specific. `From` is
7655 also implemented from `f32` to `f64`.
7656 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7657 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7658 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7659 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7661 * Sorting slices that are already sorted [is 50% faster in some
7667 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7668 * Cargo build scripts can specify their dependencies by emitting the
7669 [`rerun-if-changed`][1.6rr] key.
7670 * crates.io will reject publication of crates with dependencies that
7671 have a wildcard version constraint. Crates with wildcard
7672 dependencies were seen to cause a variety of problems, as described
7673 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7675 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7676 release folder. A variety of artifacts that Cargo failed to clean
7677 are now correctly deleted.
7682 * The `unreachable_code` lint [warns when a function call's argument
7684 * The parser indicates [failures that may be caused by
7685 confusingly-similar Unicode characters][1.6uc]
7686 * Certain macro errors [are reported at definition time][1.6m], not
7692 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7693 environment variable when locating crates. This was a pre-cargo
7694 feature for integrating with the package manager that was
7695 accidentally never removed.
7696 * [A number of bugs were fixed in the privacy checker][1.6p] that
7697 could cause previously-accepted code to break.
7698 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7699 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7700 struct pattern syntax (`Foo(..)`) can no longer be used to match
7701 unit structs. This is a warning now, but will become an error in
7702 future releases. Patterns that share the same name as a const are
7704 * A bug was fixed that causes [rustc not to apply default type
7705 parameters][1.6xc] when resolving certain method implementations of
7706 traits defined in other crates.
7708 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7709 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7710 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7711 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7712 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7713 [1.6co]: http://doc.rust-lang.org/core/index.html
7714 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7715 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7716 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7717 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7718 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7719 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7720 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7721 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7722 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7723 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7724 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7725 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7726 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7727 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7728 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7729 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7730 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7731 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7732 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7733 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7734 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7735 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7736 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7737 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7738 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7739 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7740 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7741 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7742 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7743 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7744 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7745 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7746 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7747 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7748 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7749 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7750 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7751 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7752 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7753 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7754 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7757 Version 1.5.0 (2015-12-10)
7758 ==========================
7760 * ~700 changes, numerous bugfixes
7766 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7767 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7768 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7769 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7770 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7771 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7772 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7773 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7774 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7775 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7776 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7777 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7778 [`Path::read_link`], [`Path::symlink_metadata`],
7779 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7780 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7781 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7782 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7783 [`slice::split_first_mut`], [`slice::split_first`],
7784 [`slice::split_last_mut`], [`slice::split_last`],
7785 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7786 [`str::MatchIndices`], [`str::RMatchIndices`],
7787 [`str::match_indices`], [`str::rmatch_indices`],
7788 [`str::slice_mut_unchecked`], [`string::ParseError`].
7789 * Rust applications hosted on crates.io can be installed locally to
7790 `~/.cargo/bin` with the [`cargo install`] command. Among other
7791 things this makes it easier to augment Cargo with new subcommands:
7792 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7793 invoked as `cargo foo`.
7794 * Crates with wildcard (`*`) dependencies will [emit warnings when
7795 published][1.5w]. In 1.6 it will no longer be possible to publish
7796 crates with wildcard dependencies.
7801 * The rules determining when a particular lifetime must outlive
7802 a particular value (known as '[dropck]') have been [modified
7803 to not rely on parametricity][1.5p].
7804 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7805 and `Arc`][1.5a]. Because these smart pointer types implement
7806 `Deref`, this causes breakage in cases where the interior type
7807 contains methods of the same name.
7808 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7809 that they could drop their content. Soundness fix.
7810 * All method invocations are [properly checked][1.5wf1] for
7811 [well-formedness][1.5wf2]. Soundness fix.
7812 * Traits whose supertraits contain `Self` are [not object
7813 safe][1.5o]. Soundness fix.
7814 * Target specifications support a [`no_default_libraries`][1.5nd]
7815 setting that controls whether `-nodefaultlibs` is passed to the
7816 linker, and in turn the `is_like_windows` setting no longer affects
7817 the `-nodefaultlibs` flag.
7818 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7819 * The `#[inline]` and `#[repr]` attributes [can only appear
7820 in valid locations][1.5at].
7821 * Native libraries linked from the local crate are [passed to
7822 the linker before native libraries from upstream crates][1.5nl].
7823 * Two rarely-used attributes, `#[no_debug]` and
7824 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7825 * Negation of unsigned integers, which has been a warning for
7826 several releases, [is now behind a feature gate and will
7827 generate errors][1.5nu].
7828 * The parser accidentally accepted visibility modifiers on
7829 enum variants, a bug [which has been fixed][1.5ev].
7830 * [A bug was fixed that allowed `use` statements to import unstable
7836 * When evaluating expressions at compile-time that are not
7837 compile-time constants (const-evaluating expressions in non-const
7838 contexts), incorrect code such as overlong bitshifts and arithmetic
7839 overflow will [generate a warning instead of an error][1.5ce],
7840 delaying the error until runtime. This will allow the
7841 const-evaluator to be expanded in the future backwards-compatibly.
7842 * The `improper_ctypes` lint [no longer warns about using `isize` and
7843 `usize` in FFI][1.5ict].
7848 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7850 * `Default` is [implemented for mutable slices][1.5d].
7851 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7852 * There are now `From` conversions [between floating point
7853 types][1.5f] where the conversions are lossless.
7854 * There are now `From` conversions [between integer types][1.5i] where
7855 the conversions are lossless.
7856 * [`fs::Metadata` implements `Clone`][1.5fs].
7857 * The `parse` method [accepts a leading "+" when parsing
7859 * [`AsMut` is implemented for `Vec`][1.5am].
7860 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7861 been optimized][1.5cf] and no longer rely on the default impl.
7862 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7863 `unsafe extern "C"` function types now [implement `Clone`,
7864 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7865 `fmt::Debug` for up to 12 arguments][1.5fp].
7866 * [Dropping `Vec`s is much faster in unoptimized builds when the
7867 element types don't implement `Drop`][1.5dv].
7868 * A bug that caused in incorrect behavior when [combining `VecDeque`
7869 with zero-sized types][1.5vdz] was resolved.
7870 * [`PartialOrd` for slices is faster][1.5po].
7875 * [Crate metadata size was reduced by 20%][1.5md].
7876 * [Improvements to code generation reduced the size of libcore by 3.3
7877 MB and rustc's memory usage by 18MB][1.5m].
7878 * [Improvements to deref translation increased performance in
7879 unoptimized builds][1.5dr].
7880 * Various errors in trait resolution [are deduplicated to only be
7881 reported once][1.5te].
7882 * Rust has preliminary [support for rumprun kernels][1.5rr].
7883 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7885 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7886 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7887 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7888 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7889 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7890 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7891 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7892 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7893 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7894 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7895 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7896 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7897 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7898 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7899 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7900 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7901 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7902 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7903 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7904 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7905 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7906 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7907 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7908 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7909 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7910 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7911 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7912 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7913 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7914 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7915 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7916 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7917 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7918 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7919 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7920 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7921 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7922 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7923 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7924 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7925 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7926 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7927 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7928 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7929 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7930 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7931 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7932 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7933 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7934 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7935 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7936 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7937 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7938 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7939 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7940 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7941 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7942 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7943 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7944 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7945 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7946 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7947 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7948 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7949 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7950 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7951 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7952 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7953 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7954 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7955 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7956 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7957 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7958 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7959 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7960 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7961 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7962 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7963 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7964 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7965 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7966 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7967 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7968 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7969 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7970 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7971 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7972 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7973 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7975 Version 1.4.0 (2015-10-29)
7976 ==========================
7978 * ~1200 changes, numerous bugfixes
7983 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7984 GNU) are now supported and recommended for use.
7989 * [Several changes have been made to fix type soundness and improve
7990 the behavior of associated types][sound]. See [RFC 1214]. Although
7991 we have mostly introduced these changes as warnings this release, to
7992 become errors next release, there are still some scenarios that will
7993 see immediate breakage.
7994 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7995 line breaks in addition to `\n`][crlf].
7996 * [Loans of `'static` lifetime extend to the end of a function][stat].
7997 * [`str::parse` no longer introduces avoidable rounding error when
7998 parsing floating point numbers. Together with earlier changes to
7999 float formatting/output, "round trips" like f.to_string().parse()
8000 now preserve the value of f exactly. Additionally, leading plus
8001 signs are now accepted][fp3].
8007 * `use` statements that import multiple items [can now rename
8008 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8009 * [Binops work correctly on fat pointers][binfat].
8010 * `pub extern crate`, which does not behave as expected, [issues a
8011 warning][pec] until a better solution is found.
8016 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8017 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8018 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8019 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8020 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8021 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8022 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8023 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8024 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8025 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8026 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8027 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8028 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8029 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8030 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8031 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8032 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8033 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8035 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8036 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8037 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8038 `f64::from_str_radix`.
8039 * [Reverse-searching strings is faster with the 'two-way'
8041 * [`std::io::copy` allows `?Sized` arguments][cc].
8042 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8043 [override `count`, `nth` and `last` with an O(1)
8044 implementation][it].
8045 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8046 * [`IntoRawFd` has been added to the Unix-specific prelude,
8047 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8049 * [`Extend<String>` and `FromIterator<String` are both implemented for
8051 * [`IntoIterator` is implemented for references to `Option` and
8053 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8054 Copy`][ext] as part of [RFC 839]. This will cause type inference
8055 breakage in rare situations.
8056 * [`BinaryHeap` implements `Debug`][bh2].
8057 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8059 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8060 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8061 * [String comparison is faster][faststr].
8062 * `&mut T` where `T: std::fmt::Write` [also implements
8063 `std::fmt::Write`][mutw].
8064 * [A stable regression in `VecDeque::push_back` and other
8065 capacity-altering methods that caused panics for zero-sized types
8067 * [Function pointers implement traits for up to 12 parameters][fp2].
8072 * The compiler [no longer uses the 'morestack' feature to prevent
8073 stack overflow][mm]. Instead it uses guard pages and stack
8074 probes (though stack probes are not yet implemented on any platform
8076 * [The compiler matches traits faster when projections are involved][p].
8077 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8079 * [Cargo now displays useful information about what its doing during
8080 `cargo update`][cu].
8082 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8083 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8084 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8085 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8086 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8087 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8088 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8089 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8090 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8091 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8092 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8093 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8094 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8095 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8096 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8097 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8098 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8099 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8100 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8101 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8102 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8103 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8104 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8105 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8106 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8107 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8108 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8109 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8110 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8111 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8112 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8113 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8114 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8115 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8116 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8117 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8118 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8119 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8120 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8121 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8122 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8123 [bh2]: https://github.com/rust-lang/rust/pull/28156
8124 [binfat]: https://github.com/rust-lang/rust/pull/28270
8125 [bm]: https://github.com/rust-lang/rust/pull/28197
8126 [cc]: https://github.com/rust-lang/rust/pull/27531
8127 [crlf]: https://github.com/rust-lang/rust/pull/28034
8128 [cu]: https://github.com/rust-lang/cargo/pull/1931
8129 [d]: https://github.com/rust-lang/rust/pull/27825
8130 [dep]: https://github.com/rust-lang/rust/pull/28339
8131 [es]: https://github.com/rust-lang/rust/pull/27956
8132 [ext]: https://github.com/rust-lang/rust/pull/28094
8133 [faststr]: https://github.com/rust-lang/rust/pull/28338
8134 [ffi]: https://github.com/rust-lang/rust/pull/28779
8135 [fp]: https://github.com/rust-lang/rust/pull/28268
8136 [fp2]: https://github.com/rust-lang/rust/pull/28560
8137 [fp3]: https://github.com/rust-lang/rust/pull/27307
8138 [i]: https://github.com/rust-lang/rust/pull/27451
8139 [into2]: https://github.com/rust-lang/rust/pull/28039
8140 [it]: https://github.com/rust-lang/rust/pull/27652
8141 [mm]: https://github.com/rust-lang/rust/pull/27338
8142 [mutw]: https://github.com/rust-lang/rust/pull/28368
8143 [sound]: https://github.com/rust-lang/rust/pull/27641
8144 [p]: https://github.com/rust-lang/rust/pull/27866
8145 [pec]: https://github.com/rust-lang/rust/pull/28486
8146 [pr]: https://github.com/rust-lang/rust/pull/27896
8147 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8148 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8149 [s]: https://github.com/rust-lang/rust/pull/27474
8150 [stab]: https://github.com/rust-lang/rust/pull/28339
8151 [stat]: https://github.com/rust-lang/rust/pull/28321
8152 [vd]: https://github.com/rust-lang/rust/pull/28494
8154 Version 1.3.0 (2015-09-17)
8155 ==============================
8157 * ~900 changes, numerous bugfixes
8162 * The [new object lifetime defaults][nold] have been [turned
8163 on][nold2] after a cycle of warnings about the change. Now types
8164 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8165 being interpreted as `&'a Box<Trait+'a>` to `&'a
8166 Box<Trait+'static>`.
8167 * [The Rustonomicon][nom] is a new book in the official documentation
8168 that dives into writing unsafe Rust.
8169 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8170 timekeeping is employed by other std APIs, as well as out-of-tree
8176 * The [new object lifetime defaults][nold] have been [turned
8177 on][nold2] after a cycle of warnings about the change.
8178 * There is a known [regression][lr] in how object lifetime elision is
8179 interpreted, the proper solution for which is undetermined.
8180 * The `#[prelude_import]` attribute, an internal implementation
8181 detail, was accidentally stabilized previously. [It has been put
8182 behind the `prelude_import` feature gate][pi]. This change is
8183 believed to break no existing code.
8184 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8185 [more sane for dynamically sized types][dst3]. Code that relied on
8186 the previous behavior is thought to be broken.
8187 * The `dropck` rules, which checks that destructors can't access
8188 destroyed values, [have been updated][dropck] to match the
8189 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8190 cause some previously-compiling code to no longer build.
8195 * The [new object lifetime defaults][nold] have been [turned
8196 on][nold2] after a cycle of warnings about the change.
8197 * Semicolons may [now follow types and paths in
8198 macros](https://github.com/rust-lang/rust/pull/27000).
8199 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8200 [more sane for dynamically sized types][dst3]. Code that relied on
8201 the previous behavior is not known to exist, and suspected to be
8203 * `'static` variables [may now be recursive][st].
8204 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8205 implementations correctly.
8206 * The `dropck` rules, which checks that destructors can't access
8207 destroyed values, [have been updated][dropck] to match the
8213 * The [`Duration`] API, [has been stabilized][ds], as well as the
8214 `std::time` module, which presently contains only `Duration`.
8215 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8216 * The owned C string, [`CString`], implements [`Borrow`] and the
8217 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8218 these allow C strings to be borrowed and cloned in generic code.
8219 * [`CStr`] implements [`Debug`].
8220 * [`AtomicPtr`] implements [`Debug`].
8221 * [`Error`] trait objects [can be downcast to their concrete types][e]
8222 in many common configurations, using the [`is`], [`downcast`],
8223 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8225 * Searching for substrings now [employs the two-way algorithm][search]
8226 instead of doing a naive search. This gives major speedups to a
8227 number of methods, including [`contains`][sc], [`find`][sf],
8228 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8229 [`ends_with`][sew] are also faster.
8230 * The performance of `PartialEq` for slices is [much faster][ps].
8231 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8232 is overridden and optimized by the implementations for scalars.
8233 * The [`Hasher`] trait now has a number of specialized `write_*`
8234 methods for primitive types, for efficiency.
8235 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8236 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8237 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8238 of [`std::error::Error::cause`][iec] also delegates to the inner
8240 * [`process::Child`][pc] gained the [`id`] method, which returns a
8241 `u32` representing the platform-specific process identifier.
8242 * The [`connect`] method on slices is deprecated, replaced by the new
8243 [`join`] method (note that both of these are on the *unstable*
8244 [`SliceConcatExt`] trait, but through the magic of the prelude are
8245 available to stable code anyway).
8246 * The [`Div`] operator is implemented for [`Wrapping`] types.
8247 * [`DerefMut` is implemented for `String`][dms].
8248 * Performance of SipHash (the default hasher for `HashMap`) is
8249 [better for long data][sh].
8250 * [`AtomicPtr`] implements [`Send`].
8251 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8252 are now [specialized to use uninitialized buffers for increased
8254 * Lifetime parameters of foreign functions [are now resolved
8260 * Rust can now, with some coercion, [produce programs that run on
8261 Windows XP][xp], though XP is not considered a supported platform.
8262 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8263 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8264 recommended for use in 1.3, though should be fully-functional
8265 in the [64-bit 1.4 beta][b14].
8266 * On Fedora-based systems installation will [properly configure the
8267 dynamic linker][fl].
8268 * The compiler gained many new extended error descriptions, which can
8269 be accessed with the `--explain` flag.
8270 * The `dropck` pass, which checks that destructors can't access
8271 destroyed values, [has been rewritten][dropck]. This fixes some
8272 soundness holes, and as such will cause some previously-compiling
8273 code to no longer build.
8274 * `rustc` now uses [LLVM to write archive files where possible][ar].
8275 Eventually this will eliminate the compiler's dependency on the ar
8277 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8278 supported FreeBSD on x86_64).
8279 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8280 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8282 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8283 will kill the process instead of leaking][nlp].
8285 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8286 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8287 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8288 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8289 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8290 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8291 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8292 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8293 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8294 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8295 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8296 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8297 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8298 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8299 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8300 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8301 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8302 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8303 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8304 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8305 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8306 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8307 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8308 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8309 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8310 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8311 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8312 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8313 [ar]: https://github.com/rust-lang/rust/pull/26926
8314 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8315 [dms]: https://github.com/rust-lang/rust/pull/26241
8316 [dropck]: https://github.com/rust-lang/rust/pull/27261
8317 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8318 [ds]: https://github.com/rust-lang/rust/pull/26818
8319 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8320 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8321 [dst3]: https://github.com/rust-lang/rust/pull/27351
8322 [e]: https://github.com/rust-lang/rust/pull/24793
8323 [f]: https://github.com/rust-lang/rust/pull/26588
8324 [fb]: https://github.com/rust-lang/rust/pull/26959
8325 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8326 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8327 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8328 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8329 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8330 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8331 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8332 [lic]: https://github.com/rust-lang/rust/pull/26583
8333 [lnu]: https://github.com/rust-lang/rust/pull/27026
8334 [lr]: https://github.com/rust-lang/rust/issues/27248
8335 [lum]: https://github.com/rust-lang/rust/pull/26378
8336 [lur]: https://github.com/rust-lang/rust/pull/26783
8337 [nlp]: https://github.com/rust-lang/rust/pull/27176
8338 [nold2]: https://github.com/rust-lang/rust/pull/27045
8339 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8340 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8341 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8342 [pi]: https://github.com/rust-lang/rust/pull/26699
8343 [ps]: https://github.com/rust-lang/rust/pull/26884
8344 [rte]: https://github.com/rust-lang/rust/pull/26950
8345 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8346 [search]: https://github.com/rust-lang/rust/pull/26327
8347 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8348 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8349 [sh]: https://github.com/rust-lang/rust/pull/27280
8350 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8351 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8352 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8353 [st]: https://github.com/rust-lang/rust/pull/26630
8354 [win1]: https://github.com/rust-lang/rust/pull/26569
8355 [win2]: https://github.com/rust-lang/rust/pull/26741
8356 [win3]: https://github.com/rust-lang/rust/pull/26741
8357 [win4]: https://github.com/rust-lang/rust/pull/27210
8358 [xp]: https://github.com/rust-lang/rust/pull/26569
8360 Version 1.2.0 (2015-08-07)
8361 ==========================
8363 * ~1200 changes, numerous bugfixes
8368 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8369 like `Rc` to contain types without a fixed size, arrays and trait
8370 objects, finally enabling use of `Rc<[T]>` and completing the
8371 implementation of DST.
8372 * [Parallel codegen][parcodegen] is now working again, which can
8373 substantially speed up large builds in debug mode; It also gets
8374 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8375 jobs). It's not enabled by default, but will be "in the near
8376 future". It can be activated with the `-C codegen-units=N` flag to
8378 * This is the first release with [experimental support for linking
8379 with the MSVC linker and lib C on Windows (instead of using the GNU
8380 variants via MinGW)][win]. It is yet recommended only for the most
8381 intrepid Rustaceans.
8382 * Benchmark compilations are showing a 30% improvement in
8383 bootstrapping over 1.1.
8388 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8389 unicode case mapping, which is a previously-planned change in
8390 behavior and considered a bugfix.
8391 * [`mem::align_of`] now specifies [the *minimum alignment* for
8392 T][align], which is usually the alignment programs are interested
8393 in, and the same value reported by clang's
8394 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8396 * [The `#[packed]` attribute is no longer silently accepted by the
8397 compiler][packed]. This attribute did nothing and code that
8398 mentioned it likely did not work as intended.
8399 * Associated type defaults are [now behind the
8400 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8401 defaults *did not work*, but could be mentioned syntactically. As
8402 such this breakage has minimal impact.
8407 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8408 matching against dereferenceable values.
8413 * The [`Extend`] trait, which grows a collection from an iterator, is
8414 implemented over iterators of references, for `String`, `Vec`,
8415 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8416 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8417 * The [`iter::once`] function returns an iterator that yields a single
8418 element, and [`iter::empty`] returns an iterator that yields no
8420 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8421 over substring matches.
8422 * [`Cell`] and [`RefCell`] both implement `Eq`.
8423 * A number of methods for wrapping arithmetic are added to the
8424 integral types, [`wrapping_div`], [`wrapping_rem`],
8425 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8426 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8427 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8428 type.. It is illegal for the default arithmetic operations in Rust
8429 to overflow; the desire to wrap must be explicit.
8430 * The `{:#?}` formatting specifier [displays the alternate,
8431 pretty-printed][debugfmt] form of the `Debug` formatter. This
8432 feature was actually introduced prior to 1.0 with little
8434 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8435 for writing data to formatted strings, similar to [`io::Write`].
8436 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8437 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8438 are used by code generators to emit implementations of [`Debug`].
8439 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8440 methods that convert case, following Unicode case mapping.
8441 * It is now easier to handle poisoned locks. The [`PoisonError`]
8442 type, returned by failing lock operations, exposes `into_inner`,
8443 `get_ref`, and `get_mut`, which all give access to the inner lock
8444 guard, and allow the poisoned lock to continue to operate. The
8445 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8446 poisoned lock without attempting to take the lock.
8447 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8448 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8449 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8450 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8452 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8458 * `rustc` employs smarter heuristics for guessing at [typos].
8459 * `rustc` emits more efficient code for [no-op conversions between
8460 unsafe pointers][nop].
8461 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8462 resulting in faster compile times and smaller code.
8464 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8465 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8466 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8467 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8468 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8469 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8470 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8471 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8472 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8473 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8474 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8475 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8476 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8477 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8478 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8479 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8480 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8481 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8482 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8483 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8484 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8485 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8486 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8487 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8488 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8489 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8490 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8491 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8492 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8493 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8494 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8495 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8496 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8497 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8498 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8499 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8500 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8501 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8502 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8503 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8504 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8505 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8506 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8507 [align]: https://github.com/rust-lang/rust/pull/25646
8508 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8509 [typos]: https://github.com/rust-lang/rust/pull/26087
8510 [nop]: https://github.com/rust-lang/rust/pull/26336
8511 [fat]: https://github.com/rust-lang/rust/pull/26411
8512 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8513 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8514 [packed]: https://github.com/rust-lang/rust/pull/25541
8515 [ad]: https://github.com/rust-lang/rust/pull/27382
8516 [win]: https://github.com/rust-lang/rust/pull/25350
8518 Version 1.1.0 (2015-06-25)
8519 =========================
8521 * ~850 changes, numerous bugfixes
8526 * The [`std::fs` module has been expanded][fs] to expand the set of
8527 functionality exposed:
8528 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8529 don't incur a syscall on some platforms.
8530 * A `symlink_metadata` function has been added.
8531 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8532 access to all underlying information.
8533 * The compiler now contains extended explanations of many errors. When an error
8534 with an explanation occurs the compiler suggests using the `--explain` flag
8535 to read the explanation. Error explanations are also [available online][err-index].
8536 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8537 well as other work, the time to bootstrap the compiler decreased by
8543 * The [`str::split_whitespace`] method splits a string on unicode
8544 whitespace boundaries.
8545 * On both Windows and Unix, new extension traits provide conversion of
8546 I/O types to and from the underlying system handles. On Unix, these
8547 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8548 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8549 `TcpListener`, and `UpdSocket`. Further implementations for
8550 `std::process` will be stabilized later.
8551 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8552 Windows, symlinks can be created with
8553 `std::os::windows::symlink_dir` and
8554 `std::os::windows::symlink_file`.
8555 * The `mpsc::Receiver` type can now be converted into an iterator with
8556 `into_iter` on the [`IntoIterator`] trait.
8557 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8558 implementation of the [`From`] trait.
8559 * The `Debug` implementation for `RangeFull` [creates output that is
8560 more consistent with other implementations][rf].
8561 * [`Debug` is implemented for `File`][file].
8562 * The `Default` implementation for `Arc` [no longer requires `Sync +
8564 * [The `Iterator` methods `count`, `nth`, and `last` have been
8565 overridden for slices to have O(1) performance instead of O(n)][si].
8566 * Incorrect handling of paths on Windows has been improved in both the
8567 compiler and the standard library.
8568 * [`AtomicPtr` gained a `Default` implementation][ap].
8569 * In accordance with Rust's policy on arithmetic overflow `abs` now
8570 [panics on overflow when debug assertions are enabled][abs].
8571 * The [`Cloned`] iterator, which was accidentally left unstable for
8572 1.0 [has been stabilized][c].
8573 * The [`Incoming`] iterator, which iterates over incoming TCP
8574 connections, and which was accidentally unnamable in 1.0, [is now
8575 properly exported][inc].
8576 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8577 `sift_up` or `sift_down` panic][bh].
8578 * The [`split_off`] method of `LinkedList` [no longer corrupts
8579 the list in certain scenarios][ll].
8584 * Type checking performance [has improved notably][sk] with
8585 [multiple improvements][pre].
8586 * The compiler [suggests code changes][ch] for more errors.
8587 * rustc and it's build system have experimental support for [building
8588 toolchains against MUSL][m] instead of glibc on Linux.
8589 * The compiler defines the `target_env` cfg value, which is used for
8590 distinguishing toolchains that are otherwise for the same
8591 platform. Presently this is set to `gnu` for common GNU Linux
8592 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8593 * The [`cargo rustc`][crc] command invokes a build with custom flags
8595 * [Android executables are always position independent][pie].
8596 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8599 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8600 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8601 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8602 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8603 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8604 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8605 [rf]: https://github.com/rust-lang/rust/pull/24491
8606 [err-index]: https://doc.rust-lang.org/error-index.html
8607 [sk]: https://github.com/rust-lang/rust/pull/24615
8608 [pre]: https://github.com/rust-lang/rust/pull/25323
8609 [file]: https://github.com/rust-lang/rust/pull/24598
8610 [ch]: https://github.com/rust-lang/rust/pull/24683
8611 [arc]: https://github.com/rust-lang/rust/pull/24695
8612 [si]: https://github.com/rust-lang/rust/pull/24701
8613 [ap]: https://github.com/rust-lang/rust/pull/24834
8614 [m]: https://github.com/rust-lang/rust/pull/24777
8615 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8616 [crc]: https://github.com/rust-lang/cargo/pull/1568
8617 [pie]: https://github.com/rust-lang/rust/pull/24953
8618 [abs]: https://github.com/rust-lang/rust/pull/25441
8619 [c]: https://github.com/rust-lang/rust/pull/25496
8620 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8621 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8622 [inc]: https://github.com/rust-lang/rust/pull/25522
8623 [bh]: https://github.com/rust-lang/rust/pull/25856
8624 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8625 [ll]: https://github.com/rust-lang/rust/pull/26022
8626 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8627 [drop]: https://github.com/rust-lang/rust/pull/24935
8629 Version 1.0.0 (2015-05-15)
8630 ========================
8632 * ~1500 changes, numerous bugfixes
8637 * The vast majority of the standard library is now `#[stable]`. It is
8638 no longer possible to use unstable features with a stable build of
8640 * Many popular crates on [crates.io] now work on the stable release
8642 * Arithmetic on basic integer types now [checks for overflow in debug
8648 * Several [restrictions have been added to trait coherence][coh] in
8649 order to make it easier for upstream authors to change traits
8650 without breaking downstream code.
8651 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8652 improve error messages and macro behavior. For example, `0b1234` is
8653 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8654 * Trait bounds [are always invariant][inv], eliminating the need for
8655 the `PhantomFn` and `MarkerTrait` lang items, which have been
8657 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8658 "foo" as bar` syntax has been replaced with `extern crate foo as
8659 bar`, and Cargo now automatically translates "-" in *package* names
8660 to underscore for the crate name.
8661 * [Lifetime shadowing is an error][lt].
8662 * [`Send` no longer implies `'static`][send-rfc].
8663 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8664 `MyType::default()`.
8665 * Primitive types [now have inherent methods][prim-inherent],
8666 obviating the need for extension traits like `SliceExt`.
8667 * Methods with `Self: Sized` in their `where` clause are [considered
8668 object-safe][self-sized], allowing many extension traits like
8669 `IteratorExt` to be merged into the traits they extended.
8670 * You can now [refer to associated types][assoc-where] whose
8671 corresponding trait bounds appear only in a `where` clause.
8672 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8673 like `Send` and `Sync` are now library-defined.
8674 * A [Reflect trait][reflect] was introduced, which means that
8675 downcasting via the `Any` trait is effectively limited to concrete
8676 types. This helps retain the potentially-important "parametricity"
8677 property: generic code cannot behave differently for different type
8678 arguments except in minor ways.
8679 * The `unsafe_destructor` feature is now deprecated in favor of the
8680 [new `dropck`][dropck]. This change is a major reduction in unsafe
8686 * The `thread_local` module [has been renamed to `std::thread`][th].
8687 * The methods of `IteratorExt` [have been moved to the `Iterator`
8689 * Several traits that implement Rust's conventions for type
8690 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8691 [centralized in the `std::convert` module][con].
8692 * The `FromError` trait [was removed in favor of `From`][fe].
8693 * The basic sleep function [has moved to
8694 `std::thread::sleep_ms`][slp].
8695 * The `splitn` function now takes an `n` parameter that represents the
8696 number of items yielded by the returned iterator [instead of the
8697 number of 'splits'][spl].
8698 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8699 * [Derived implementations of `PartialOrd` now order enums according
8700 to their explicitly-assigned discriminants][po].
8701 * [Methods for searching strings are generic over `Pattern`s][pat],
8702 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8704 * [In method resolution, object methods are resolved before inherent
8706 * [`String::from_str` has been deprecated in favor of the `From` impl,
8707 `String::from`][sf].
8708 * [`io::Error` implements `Sync`][ios].
8709 * [The `words` method on `&str` has been replaced with
8710 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8712 * The new path and IO modules are complete and `#[stable]`. This
8713 was the major library focus for this cycle.
8714 * The path API was [revised][path-normalize] to normalize `.`,
8715 adjusting the tradeoffs in favor of the most common usage.
8716 * A large number of remaining APIs in `std` were also stabilized
8717 during this cycle; about 75% of the non-deprecated API surface
8719 * The new [string pattern API][string-pattern] landed, which makes
8720 the string slice API much more internally consistent and flexible.
8721 * A new set of [generic conversion traits][conversion] replaced
8722 many existing ad hoc traits.
8723 * Generic numeric traits were [completely removed][num-traits]. This
8724 was made possible thanks to inherent methods for primitive types,
8725 and the removal gives maximal flexibility for designing a numeric
8726 hierarchy in the future.
8727 * The `Fn` traits are now related via [inheritance][fn-inherit]
8728 and provide ergonomic [blanket implementations][fn-blanket].
8729 * The `Index` and `IndexMut` traits were changed to
8730 [take the index by value][index-value], enabling code like
8731 `hash_map["string"]` to work.
8732 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8733 `Copy` data is known to be `Clone` as well.
8738 * Many errors now have extended explanations that can be accessed with
8739 the `--explain` flag to `rustc`.
8740 * Many new examples have been added to the standard library
8742 * rustdoc has received a number of improvements focused on completion
8744 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8745 * Much headway was made on ecosystem-wide CI, making it possible
8746 to [compare builds for breakage][ci-compare].
8749 [crates.io]: http://crates.io
8750 [clo]: https://github.com/rust-lang/rust/pull/24034
8751 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8752 [con]: https://github.com/rust-lang/rust/pull/23875
8753 [cr]: https://github.com/rust-lang/rust/pull/23419
8754 [fe]: https://github.com/rust-lang/rust/pull/23879
8755 [ie]: https://github.com/rust-lang/rust/pull/23300
8756 [inv]: https://github.com/rust-lang/rust/pull/23938
8757 [ios]: https://github.com/rust-lang/rust/pull/24133
8758 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8759 [lt]: https://github.com/rust-lang/rust/pull/24057
8760 [meth]: https://github.com/rust-lang/rust/pull/24056
8761 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8762 [po]: https://github.com/rust-lang/rust/pull/24270
8763 [sf]: https://github.com/rust-lang/rust/pull/24517
8764 [slp]: https://github.com/rust-lang/rust/pull/23949
8765 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8766 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8767 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8768 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8769 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8770 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8771 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8772 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8773 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8774 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8775 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8776 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8777 [reflect]: https://github.com/rust-lang/rust/pull/23712
8778 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8779 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8780 [index-value]: https://github.com/rust-lang/rust/pull/23601
8781 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8782 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8783 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8784 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8785 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8786 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8789 Version 1.0.0-alpha.2 (2015-02-20)
8790 =====================================
8792 * ~1300 changes, numerous bugfixes
8796 * The various I/O modules were [overhauled][io-rfc] to reduce
8797 unnecessary abstractions and provide better interoperation with
8798 the underlying platform. The old `io` module remains temporarily
8800 * The standard library now [participates in feature gating][feat],
8801 so use of unstable libraries now requires a `#![feature(...)]`
8802 attribute. The impact of this change is [described on the
8803 forum][feat-forum]. [RFC][feat-rfc].
8807 * `for` loops [now operate on the `IntoIterator` trait][into],
8808 which eliminates the need to call `.iter()`, etc. to iterate
8809 over collections. There are some new subtleties to remember
8810 though regarding what sort of iterators various types yield, in
8811 particular that `for foo in bar { }` yields values from a move
8812 iterator, destroying the original collection. [RFC][into-rfc].
8813 * Objects now have [default lifetime bounds][obj], so you don't
8814 have to write `Box<Trait+'static>` when you don't care about
8815 storing references. [RFC][obj-rfc].
8816 * In types that implement `Drop`, [lifetimes must outlive the
8817 value][drop]. This will soon make it possible to safely
8818 implement `Drop` for types where `#[unsafe_destructor]` is now
8819 required. Read the [gorgeous RFC][drop-rfc] for details.
8820 * The fully qualified <T as Trait>::X syntax lets you set the Self
8821 type for a trait method or associated type. [RFC][ufcs-rfc].
8822 * References to types that implement `Deref<U>` now [automatically
8823 coerce to references][deref] to the dereferenced type `U`,
8824 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8825 should eliminate many unsightly uses of `&*`, as when converting
8826 from references to vectors into references to
8827 slices. [RFC][deref-rfc].
8828 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8829 `|:|`) is obsolete and closure kind is inferred from context.
8830 * [`Self` is a keyword][Self].
8834 * The `Show` and `String` formatting traits [have been
8835 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8836 their related purposes. Automatically getting a string
8837 conversion to use with `format!("{:?}", something_to_debug)` is
8838 now written `#[derive(Debug)]`.
8839 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8840 OsStr}`, provide strings in platform-specific encodings for easier
8841 interop with system APIs. [RFC][osstr-rfc].
8842 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8843 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8844 creating raw pointers.
8848 * Certain long error messages of the form 'expected foo found bar'
8849 are now [split neatly across multiple
8850 lines][multiline]. Examples in the PR.
8851 * On Unix Rust can be [uninstalled][un] by running
8852 `/usr/local/lib/rustlib/uninstall.sh`.
8853 * The `#[rustc_on_unimplemented]` attribute, requiring the
8854 'on_unimplemented' feature, lets rustc [display custom error
8855 messages when a trait is expected to be implemented for a type
8860 * Rust is tested against a [LALR grammar][lalr], which parses
8861 almost all the Rust files that rustc does.
8863 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8864 [close]: https://github.com/rust-lang/rust/pull/21843
8865 [deref]: https://github.com/rust-lang/rust/pull/21351
8866 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8867 [drop]: https://github.com/rust-lang/rust/pull/21972
8868 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8869 [feat]: https://github.com/rust-lang/rust/pull/21248
8870 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8871 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8872 [fmt]: https://github.com/rust-lang/rust/pull/21457
8873 [into]: https://github.com/rust-lang/rust/pull/20790
8874 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8875 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8876 [lalr]: https://github.com/rust-lang/rust/pull/21452
8877 [multiline]: https://github.com/rust-lang/rust/pull/19870
8878 [obj]: https://github.com/rust-lang/rust/pull/22230
8879 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8880 [onun]: https://github.com/rust-lang/rust/pull/20889
8881 [osstr]: https://github.com/rust-lang/rust/pull/21488
8882 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8883 [Self]: https://github.com/rust-lang/rust/pull/22158
8884 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8885 [un]: https://github.com/rust-lang/rust/pull/22256
8888 Version 1.0.0-alpha (2015-01-09)
8889 ==================================
8891 * ~2400 changes, numerous bugfixes
8895 * The language itself is considered feature complete for 1.0,
8896 though there will be many usability improvements and bugfixes
8897 before the final release.
8898 * Nearly 50% of the public API surface of the standard library has
8899 been declared 'stable'. Those interfaces are unlikely to change
8901 * The long-running debate over integer types has been
8902 [settled][ints]: Rust will ship with types named `isize` and
8903 `usize`, rather than `int` and `uint`, for pointer-sized
8904 integers. Guidelines will be rolled out during the alpha cycle.
8905 * Most crates that are not `std` have been moved out of the Rust
8906 distribution into the Cargo ecosystem so they can evolve
8907 separately and don't need to be stabilized as quickly, including
8908 'time', 'getopts', 'num', 'regex', and 'term'.
8909 * Documentation continues to be expanded with more API coverage, more
8910 examples, and more in-depth explanations. The guides have been
8911 consolidated into [The Rust Programming Language][trpl].
8912 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8913 * All official Rust binary installers now come with [Cargo], the
8914 Rust package manager.
8918 * Closures have been [completely redesigned][unboxed] to be
8919 implemented in terms of traits, can now be used as generic type
8920 bounds and thus monomorphized and inlined, or via an opaque
8921 pointer (boxed) as in the old system. The new system is often
8922 referred to as 'unboxed' closures.
8923 * Traits now support [associated types][assoc], allowing families
8924 of related types to be defined together and used generically in
8926 * Enum variants are [namespaced by their type names][enum].
8927 * [`where` clauses][where] provide a more versatile and attractive
8928 syntax for specifying generic bounds, though the previous syntax
8930 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8932 * Rust [no longer has a runtime][rt] of any description, and only
8933 supports OS threads, not green threads.
8934 * At long last, Rust has been overhauled for 'dynamically-sized
8935 types' ([DST]), which integrates 'fat pointers' (object types,
8936 arrays, and `str`) more deeply into the type system, making it
8938 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8939 `..j` that produce range types and which, when combined with the
8940 `Index` operator and multidispatch, leads to a convenient slice
8942 * The new range syntax revealed an ambiguity in the fixed-length
8943 array syntax, so now fixed length arrays [are written `[T;
8945 * The `Copy` trait is no longer implemented automatically. Unsafe
8946 pointers no longer implement `Sync` and `Send` so types
8947 containing them don't automatically either. `Sync` and `Send`
8948 are now 'unsafe traits' so one can "forcibly" implement them via
8949 `unsafe impl` if a type confirms to the requirements for them
8950 even though the internals do not (e.g. structs containing unsafe
8951 pointers like `Arc`). These changes are intended to prevent some
8952 footguns and are collectively known as [opt-in built-in
8953 traits][oibit] (though `Sync` and `Send` will soon become pure
8954 library types unknown to the compiler).
8955 * Operator traits now take their operands [by value][ops], and
8956 comparison traits can use multidispatch to compare one type
8957 against multiple other types, allowing e.g. `String` to be
8958 compared with `&str`.
8959 * `if let` and `while let` are no longer feature-gated.
8960 * Rust has adopted a more [uniform syntax for escaping unicode
8961 characters][unicode].
8962 * `macro_rules!` [has been declared stable][mac]. Though it is a
8963 flawed system it is sufficiently popular that it must be usable
8964 for 1.0. Effort has gone into [future-proofing][mac-future] it
8965 in ways that will allow other macro systems to be developed in
8966 parallel, and won't otherwise impact the evolution of the
8968 * The prelude has been [pared back significantly][prelude] such
8969 that it is the minimum necessary to support the most pervasive
8970 code patterns, and through [generalized where clauses][where]
8971 many of the prelude extension traits have been consolidated.
8972 * Rust's rudimentary reflection [has been removed][refl], as it
8973 incurred too much code generation for little benefit.
8974 * [Struct variants][structvars] are no longer feature-gated.
8975 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8976 known as 'higher-ranked trait bounds', this crucially allows
8977 unboxed closures to work.
8978 * Macros invocations surrounded by parens or square brackets and
8979 not terminated by a semicolon are [parsed as
8980 expressions][macros], which makes expressions like `vec![1i32,
8981 2, 3].len()` work as expected.
8982 * Trait objects now implement their traits automatically, and
8983 traits that can be coerced to objects now must be [object
8985 * Automatically deriving traits is now done with `#[derive(...)]`
8986 not `#[deriving(...)]` for [consistency with other naming
8987 conventions][derive].
8988 * Importing the containing module or enum at the same time as
8989 items or variants they contain is [now done with `self` instead
8990 of `mod`][self], as in use `foo::{self, bar}`
8991 * Glob imports are no longer feature-gated.
8992 * The `box` operator and `box` patterns have been feature-gated
8993 pending a redesign. For now unique boxes should be allocated
8994 like other containers, with `Box::new`.
8998 * A [series][coll1] of [efforts][coll2] to establish
8999 [conventions][coll3] for collections types has resulted in API
9000 improvements throughout the standard library.
9001 * New [APIs for error handling][err] provide ergonomic interop
9002 between error types, and [new conventions][err-conv] describe
9003 more clearly the recommended error handling strategies in Rust.
9004 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9005 it is easier to discuss failure in the context of error handling
9006 without making clarifications as to whether you are referring to
9007 the 'fail' macro or failure more generally.
9008 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9009 syscall when available.
9010 * The 'serialize' crate has been renamed 'rustc-serialize' and
9011 moved out of the distribution to Cargo. Although it is widely
9012 used now, it is expected to be superseded in the near future.
9013 * The `Show` formatter, typically implemented with
9014 `#[derive(Show)]` is [now requested with the `{:?}`
9015 specifier][show] and is intended for use by all types, for uses
9016 such as `println!` debugging. The new `String` formatter must be
9017 implemented by hand, uses the `{}` specifier, and is intended
9018 for full-fidelity conversions of things that can logically be
9019 represented as strings.
9023 * [Flexible target specification][flex] allows rustc's code
9024 generation to be configured to support otherwise-unsupported
9026 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9027 respective debuggers with Rust-appropriate pretty-printing.
9028 * The Windows installation of Rust is distributed with the
9029 MinGW components currently required to link binaries on that
9034 * Nullable enum optimizations have been extended to more types so
9035 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9036 space than the inner types themselves.
9037 * Work has begun on supporting AArch64.
9039 [Cargo]: https://crates.io
9040 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9041 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9042 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9043 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9044 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9045 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9046 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9047 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9048 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9049 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9050 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9051 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9052 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9053 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9054 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9055 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9056 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9057 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9058 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9059 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9060 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9061 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9062 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9063 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9064 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9065 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9066 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9067 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9068 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9069 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9070 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9071 [trpl]: https://doc.rust-lang.org/book/index.html
9072 [rbe]: http://rustbyexample.com/
9075 Version 0.12.0 (2014-10-09)
9076 =============================
9078 * ~1900 changes, numerous bugfixes
9082 * The introductory documentation (now called The Rust Guide) has
9083 been completely rewritten, as have a number of supplementary
9085 * Rust's package manager, Cargo, continues to improve and is
9086 sometimes considered to be quite awesome.
9087 * Many API's in `std` have been reviewed and updated for
9088 consistency with the in-development Rust coding
9089 guidelines. The standard library documentation tracks
9090 stabilization progress.
9091 * Minor libraries have been moved out-of-tree to the rust-lang org
9092 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9093 be installed with Cargo.
9094 * Lifetime elision allows lifetime annotations to be left off of
9095 function declarations in many common scenarios.
9096 * Rust now works on 64-bit Windows.
9099 * Indexing can be overloaded with the `Index` and `IndexMut`
9101 * The `if let` construct takes a branch only if the `let` pattern
9102 matches, currently behind the 'if_let' feature gate.
9103 * 'where clauses', a more flexible syntax for specifying trait
9104 bounds that is more aesthetic, have been added for traits and
9105 free functions. Where clauses will in the future make it
9106 possible to constrain associated types, which would be
9107 impossible with the existing syntax.
9108 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9109 the 'slicing_syntax' feature gate, and can be overloaded with
9110 the `Slice` or `SliceMut` traits.
9111 * The syntax for matching of sub-slices has been changed to use a
9112 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9113 consistency with other uses of `..` and to future-proof
9114 potential additional uses of the syntax.
9115 * The syntax for matching inclusive ranges in patterns has changed
9116 from `0..3` to `0...4` to be consistent with the exclusive range
9118 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9119 c]`) has been put behind the 'advanced_slice_patterns' feature
9120 gate and may be removed in the future.
9121 * Components of tuples and tuple structs can be extracted using
9122 the `value.0` syntax, currently behind the `tuple_indexing`
9124 * The `#[crate_id]` attribute is no longer supported; versioning
9125 is handled by the package manager.
9126 * Renaming crate imports are now written `extern crate foo as bar`
9127 instead of `extern crate bar = foo`.
9128 * Renaming use statements are now written `use foo as bar` instead
9130 * `let` and `match` bindings and argument names in macros are now
9132 * The new, more efficient, closure types ('unboxed closures') have
9133 been added under a feature gate, 'unboxed_closures'. These will
9134 soon replace the existing closure types, once higher-ranked
9135 trait lifetimes are added to the language.
9136 * `move` has been added as a keyword, for indicating closures
9137 that capture by value.
9138 * Mutation and assignment is no longer allowed in pattern guards.
9139 * Generic structs and enums can now have trait bounds.
9140 * The `Share` trait is now called `Sync` to free up the term
9141 'shared' to refer to 'shared reference' (the default reference
9143 * Dynamically-sized types have been mostly implemented,
9144 unifying the behavior of fat-pointer types with the rest of the
9146 * As part of dynamically-sized types, the `Sized` trait has been
9147 introduced, which qualifying types implement by default, and
9148 which type parameters expect by default. To specify that a type
9149 parameter does not need to be sized, write `<Sized? T>`. Most
9150 types are `Sized`, notable exceptions being unsized arrays
9151 (`[T]`) and trait types.
9152 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9153 * Lifetime bounds can now be applied to type parameters and object
9155 * The old, reference counted GC type, `Gc<T>` which was once
9156 denoted by the `@` sigil, has finally been removed. GC will be
9157 revisited in the future.
9160 * Library documentation has been improved for a number of modules.
9161 * Bit-vectors, collections::bitv has been modernized.
9162 * The url crate is deprecated in favor of
9163 http://github.com/servo/rust-url, which can be installed with
9165 * Most I/O stream types can be cloned and subsequently closed from
9167 * A `std::time::Duration` type has been added for use in I/O
9168 methods that rely on timers, as well as in the 'time' crate's
9169 `Timespec` arithmetic.
9170 * The runtime I/O abstraction layer that enabled the green thread
9171 scheduler to do non-thread-blocking I/O has been removed, along
9172 with the libuv-based implementation employed by the green thread
9173 scheduler. This will greatly simplify the future I/O work.
9174 * `collections::btree` has been rewritten to have a more
9175 idiomatic and efficient design.
9178 * rustdoc output now indicates the stability levels of API's.
9179 * The `--crate-name` flag can specify the name of the crate
9180 being compiled, like `#[crate_name]`.
9181 * The `-C metadata` specifies additional metadata to hash into
9182 symbol names, and `-C extra-filename` specifies additional
9183 information to put into the output filename, for use by the
9184 package manager for versioning.
9185 * debug info generation has continued to improve and should be
9186 more reliable under both gdb and lldb.
9187 * rustc has experimental support for compiling in parallel
9188 using the `-C codegen-units` flag.
9189 * rustc no longer encodes rpath information into binaries by
9193 * Stack usage has been optimized with LLVM lifetime annotations.
9194 * Official Rust binaries on Linux are more compatible with older
9195 kernels and distributions, built on CentOS 5.10.
9198 Version 0.11.0 (2014-07-02)
9199 ==========================
9201 * ~1700 changes, numerous bugfixes
9204 * ~[T] has been removed from the language. This type is superseded by
9206 * ~str has been removed from the language. This type is superseded by
9208 * ~T has been removed from the language. This type is superseded by the
9210 * @T has been removed from the language. This type is superseded by the
9211 standard library's std::gc::Gc<T> type.
9212 * Struct fields are now all private by default.
9213 * Vector indices and shift amounts are both required to be a `uint`
9214 instead of any integral type.
9215 * Byte character, byte string, and raw byte string literals are now all
9216 supported by prefixing the normal literal with a `b`.
9217 * Multiple ABIs are no longer allowed in an ABI string
9218 * The syntax for lifetimes on closures/procedures has been tweaked
9219 slightly: `<'a>|A, B|: 'b + K -> T`
9220 * Floating point modulus has been removed from the language; however it
9221 is still provided by a library implementation.
9222 * Private enum variants are now disallowed.
9223 * The `priv` keyword has been removed from the language.
9224 * A closure can no longer be invoked through a &-pointer.
9225 * The `use foo, bar, baz;` syntax has been removed from the language.
9226 * The transmute intrinsic no longer works on type parameters.
9227 * Statics now allow blocks/items in their definition.
9228 * Trait bounds are separated from objects with + instead of : now.
9229 * Objects can no longer be read while they are mutably borrowed.
9230 * The address of a static is now marked as insignificant unless the
9231 #[inline(never)] attribute is placed it.
9232 * The #[unsafe_destructor] attribute is now behind a feature gate.
9233 * Struct literals are no longer allowed in ambiguous positions such as
9234 if, while, match, and for..in.
9235 * Declaration of lang items and intrinsics are now feature-gated by
9237 * Integral literals no longer default to `int`, and floating point
9238 literals no longer default to `f64`. Literals must be suffixed with an
9239 appropriate type if inference cannot determine the type of the
9241 * The Box<T> type is no longer implicitly borrowed to &mut T.
9242 * Procedures are now required to not capture borrowed references.
9245 * The standard library is now a "facade" over a number of underlying
9246 libraries. This means that development on the standard library should
9247 be speedier due to smaller crates, as well as a clearer line between
9249 * A new library, libcore, lives under the standard library's facade
9250 which is Rust's "0-assumption" library, suitable for embedded and
9251 kernel development for example.
9252 * A regex crate has been added to the standard distribution. This crate
9253 includes statically compiled regular expressions.
9254 * The unwrap/unwrap_err methods on Result require a Show bound for
9255 better error messages.
9256 * The return types of the std::comm primitives have been centralized
9257 around the Result type.
9258 * A number of I/O primitives have gained the ability to time out their
9260 * A number of I/O primitives have gained the ability to close their
9261 reading/writing halves to cancel pending operations.
9262 * Reverse iterator methods have been removed in favor of `rev()` on
9263 their forward-iteration counterparts.
9264 * A bitflags! macro has been added to enable easy interop with C and
9265 management of bit flags.
9266 * A debug_assert! macro is now provided which is disabled when
9267 `--cfg ndebug` is passed to the compiler.
9268 * A graphviz crate has been added for creating .dot files.
9269 * The std::cast module has been migrated into std::mem.
9270 * The std::local_data api has been migrated from freestanding functions
9271 to being based on methods.
9272 * The Pod trait has been renamed to Copy.
9273 * jemalloc has been added as the default allocator for types.
9274 * The API for allocating memory has been changed to use proper alignment
9275 and sized deallocation
9276 * Connecting a TcpStream or binding a TcpListener is now based on a
9277 string address and a u16 port. This allows connecting to a hostname as
9279 * The Reader trait now contains a core method, read_at_least(), which
9280 correctly handles many repeated 0-length reads.
9281 * The process-spawning API is now centered around a builder-style
9283 * The :? printing qualifier has been moved from the standard library to
9284 an external libdebug crate.
9285 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9286 have been renamed to Eq/Ord.
9287 * The select/plural methods have been removed from format!. The escapes
9288 for { and } have also changed from \{ and \} to {{ and }},
9290 * The TaskBuilder API has been re-worked to be a true builder, and
9291 extension traits for spawning native/green tasks have been added.
9294 * All breaking changes to the language or libraries now have their
9295 commit message annotated with `[breaking-change]` to allow for easy
9296 discovery of breaking changes.
9297 * The compiler will now try to suggest how to annotate lifetimes if a
9298 lifetime-related error occurs.
9299 * Debug info continues to be improved greatly with general bug fixes and
9300 better support for situations like link time optimization (LTO).
9301 * Usage of syntax extensions when cross-compiling has been fixed.
9302 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9303 -fdata-sections and --gc-sections has been enabled by default
9304 * The compiler is now stricter about where it will load module files
9305 from when a module is declared via `mod foo;`.
9306 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9307 Syntax extensions are now discovered via a "plugin registrar" type
9308 which will be extended in the future to other various plugins.
9309 * Lints have been restructured to allow for dynamically loadable lints.
9310 * A number of rustdoc improvements:
9311 * The HTML output has been visually redesigned.
9312 * Markdown is now powered by hoedown instead of sundown.
9313 * Searching heuristics have been greatly improved.
9314 * The search index has been reduced in size by a great amount.
9315 * Cross-crate documentation via `pub use` has been greatly improved.
9316 * Primitive types are now hyperlinked and documented.
9317 * Documentation has been moved from static.rust-lang.org/doc to
9319 * A new sandbox, play.rust-lang.org, is available for running and
9320 sharing rust code examples on-line.
9321 * Unused attributes are now more robustly warned about.
9322 * The dead_code lint now warns about unused struct fields.
9323 * Cross-compiling to iOS is now supported.
9324 * Cross-compiling to mipsel is now supported.
9325 * Stability attributes are now inherited by default and no longer apply
9326 to intra-crate usage, only inter-crate usage.
9327 * Error message related to non-exhaustive match expressions have been
9331 Version 0.10 (2014-04-03)
9332 =========================
9334 * ~1500 changes, numerous bugfixes
9337 * A new RFC process is now in place for modifying the language.
9338 * Patterns with `@`-pointers have been removed from the language.
9339 * Patterns with unique vectors (`~[T]`) have been removed from the
9341 * Patterns with unique strings (`~str`) have been removed from the
9343 * `@str` has been removed from the language.
9344 * `@[T]` has been removed from the language.
9345 * `@self` has been removed from the language.
9346 * `@Trait` has been removed from the language.
9347 * Headers on `~` allocations which contain `@` boxes inside the type for
9348 reference counting have been removed.
9349 * The semantics around the lifetimes of temporary expressions have changed,
9350 see #3511 and #11585 for more information.
9351 * Cross-crate syntax extensions are now possible, but feature gated. See
9352 #11151 for more information. This includes both `macro_rules!` macros as
9353 well as syntax extensions such as `format!`.
9354 * New lint modes have been added, and older ones have been turned on to be
9356 * Unnecessary parentheses
9359 * Uppercase variables
9360 * Publicly visible private types
9361 * `#[deriving]` with raw pointers
9362 * Unsafe functions can no longer be coerced to closures.
9363 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9364 * The `#[simd]` attribute is now behind a feature gate.
9365 * Visibility is no longer allowed on `extern crate` statements, and
9366 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9367 * Trailing commas are now allowed in argument lists and tuple patterns.
9368 * The `do` keyword has been removed, it is now a reserved keyword.
9369 * Default type parameters have been implemented, but are feature gated.
9370 * Borrowed variables through captures in closures are now considered soundly.
9371 * `extern mod` is now `extern crate`
9372 * The `Freeze` trait has been removed.
9373 * The `Share` trait has been added for types that can be shared among
9375 * Labels in macros are now hygienic.
9376 * Expression/statement macro invocations can be delimited with `{}` now.
9377 * Treatment of types allowed in `static mut` locations has been tweaked.
9378 * The `*` and `.` operators are now overloadable through the `Deref` and
9380 * `~Trait` and `proc` no longer have `Send` bounds by default.
9381 * Partial type hints are now supported with the `_` type marker.
9382 * An `Unsafe` type was introduced for interior mutability. It is now
9383 considered undefined to transmute from `&T` to `&mut T` without using the
9385 * The #[linkage] attribute was implemented for extern statics/functions.
9386 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9387 * `Pod` was renamed to `Copy`.
9390 * The `libextra` library has been removed. It has now been decomposed into
9391 component libraries with smaller and more focused nuggets of
9392 functionality. The full list of libraries can be found on the
9393 documentation index page.
9394 * std: `std::condition` has been removed. All I/O errors are now propagated
9395 through the `Result` type. In order to assist with error handling, a
9396 `try!` macro for unwrapping errors with an early return and a lint for
9397 unused results has been added. See #12039 for more information.
9398 * std: The `vec` module has been renamed to `slice`.
9399 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9400 This will become the only growable vector in the future.
9401 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9402 are now found at `std::io::BufferedReader` instead of
9403 `std::io::buffered::BufferedReader`.
9404 * std: `print` and `println` are no longer in the prelude, the `print!` and
9405 `println!` macros are intended to be used instead.
9406 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9407 attempts to statically prevent cycles.
9408 * std: The standard distribution is adopting the policy of pushing failure
9409 to the user rather than failing in libraries. Many functions (such as
9410 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9411 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9412 deriving mode: `#[deriving(Show)]`.
9413 * std: `ToStr` is now implemented for all types implementing `Show`.
9414 * std: The formatting trait methods now take `&self` instead of `&T`
9415 * std: The `invert()` method on iterators has been renamed to `rev()`
9416 * std: `std::num` has seen a reduction in the genericity of its traits,
9417 consolidating functionality into a few core traits.
9418 * std: Backtraces are now printed on task failure if the environment
9419 variable `RUST_BACKTRACE` is present.
9420 * std: Naming conventions for iterators have been standardized. More details
9421 can be found on the wiki's style guide.
9422 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9423 still implement the function.
9424 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9425 * std: `assert_approx_eq!` has been removed
9426 * std: The `e` and `E` formatting specifiers for floats have been added to
9427 print them in exponential notation.
9428 * std: The `Times` trait has been removed
9429 * std: Indications of variance and opting out of builtin bounds is done
9430 through marker types in `std::kinds::marker` now
9431 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9432 `#[deriving(Hash)]` is now possible.
9433 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9434 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9435 * std: `Chan::new` is now `channel()`.
9436 * std: A new synchronous channel type has been implemented.
9437 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9438 * std: `hashmap` and `trie` have been moved to `libcollections`
9439 * std: `run` has been rolled into `io::process`
9440 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9441 * std: The equality and comparison traits have seen some reorganization.
9442 * std: `rand` has moved to `librand`.
9443 * std: `to_{lower,upper}case` has been implemented for `char`.
9444 * std: Logging has been moved to `liblog`.
9445 * collections: `HashMap` has been rewritten for higher performance and less
9447 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9448 it can be booted manually. The runtime guide has more information and
9450 * native: All I/O functionality except signals has been implemented.
9451 * green: Task spawning with `libgreen` has been optimized with stack caching
9452 and various trimming of code.
9453 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9454 * sync: The `extra::sync` module has been updated to modern rust (and moved
9455 to the `sync` library), tweaking and improving various interfaces while
9456 dropping redundant functionality.
9457 * sync: A new `Barrier` type has been added to the `sync` library.
9458 * sync: An efficient mutex for native and green tasks has been implemented.
9459 * serialize: The `base64` module has seen some improvement. It treats
9460 newlines better, has non-string error values, and has seen general
9462 * fourcc: A `fourcc!` macro was introduced
9463 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9464 hexadecimal literal.
9467 * `rustpkg` has been deprecated and removed from the main repository. Its
9468 replacement, `cargo`, is under development.
9469 * Nightly builds of rust are now available
9470 * The memory usage of rustc has been improved many times throughout this
9472 * The build process supports disabling rpath support for the rustc binary
9474 * Code generation has improved in some cases, giving more information to the
9475 LLVM optimization passes to enable more extensive optimizations.
9476 * Debuginfo compatibility with lldb on OSX has been restored.
9477 * The master branch is now gated on an android bot, making building for
9478 android much more reliable.
9479 * Output flags have been centralized into one `--emit` flag.
9480 * Crate type flags have been centralized into one `--crate-type` flag.
9481 * Codegen flags have been consolidated behind a `-C` flag.
9482 * Linking against outdated crates now has improved error messages.
9483 * Error messages with lifetimes will often suggest how to annotate the
9484 function to fix the error.
9485 * Many more types are documented in the standard library, and new guides
9487 * Many `rustdoc` improvements:
9488 * code blocks are syntax highlighted.
9489 * render standalone markdown files.
9490 * the --test flag tests all code blocks by default.
9491 * exported macros are displayed.
9492 * re-exported types have their documentation inlined at the location of the
9494 * search works across crates that have been rendered to the same output
9498 Version 0.9 (2014-01-09)
9499 ==========================
9501 * ~1800 changes, numerous bugfixes
9504 * The `float` type has been removed. Use `f32` or `f64` instead.
9505 * A new facility for enabling experimental features (feature gating) has
9506 been added, using the crate-level `#[feature(foo)]` attribute.
9507 * Managed boxes (@) are now behind a feature gate
9508 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9509 standard library's `Gc` or `Rc` types instead.
9510 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9511 * Jumping back to the top of a loop is now done with `continue` instead of
9513 * Strings can no longer be mutated through index assignment.
9514 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9515 hash delimiters, as in `r###"foo"###`.
9516 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9518 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9519 * `@fn`s have been removed.
9520 * `do` only works with procs in order to make it obvious what the cost
9522 * Single-element tuple-like structs can no longer be dereferenced to
9523 obtain the inner value. A more comprehensive solution for overloading
9524 the dereference operator will be provided in the future.
9525 * The `#[link(...)]` attribute has been replaced with
9526 `#[crate_id = "name#vers"]`.
9527 * Empty `impl`s must be terminated with empty braces and may not be
9528 terminated with a semicolon.
9529 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9530 no longer has any special meaning.
9531 * The old `fmt!` string formatting macro has been removed.
9532 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9533 `print!` and `println!`.
9534 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9535 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9536 `extern mod foo = "bar"` instead.
9537 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9538 * Macros can have attributes.
9539 * Macros can expand to items with attributes.
9540 * Macros can expand to multiple items.
9541 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9542 * Comments may be nested.
9543 * Values automatically coerce to trait objects they implement, without
9545 * Enum discriminants are no longer an entire word but as small as needed to
9546 contain all the variants. The `repr` attribute can be used to override
9547 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9548 `#[repr(C)]` to match C enums.
9549 * Non-string literals are not allowed in attributes (they never worked).
9550 * The FFI now supports variadic functions.
9551 * Octal numeric literals, as in `0o7777`.
9552 * The `concat!` syntax extension performs compile-time string concatenation.
9553 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9554 removed as Rust no longer uses segmented stacks.
9555 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9556 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9557 not `*`; ignoring remaining fields of a struct is also done with `..`,
9558 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9559 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9560 * `rustc` supports the "system" calling convention, which defaults to the
9561 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9563 * The `type_overflow` lint (default: warn) checks literals for overflow.
9564 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9565 * The `attribute_usage` lint (default: warn) warns about unknown
9567 * The `unknown_features` lint (default: warn) warns about unknown
9569 * The `dead_code` lint (default: warn) checks for dead code.
9570 * Rust libraries can be linked statically to one another
9571 * `#[link_args]` is behind the `link_args` feature gate.
9572 * Native libraries are now linked with `#[link(name = "foo")]`
9573 * Native libraries can be statically linked to a rust crate
9574 (`#[link(name = "foo", kind = "static")]`).
9575 * Native OS X frameworks are now officially supported
9576 (`#[link(name = "foo", kind = "framework")]`).
9577 * The `#[thread_local]` attribute creates thread-local (not task-local)
9578 variables. Currently behind the `thread_local` feature gate.
9579 * The `return` keyword may be used in closures.
9580 * Types that can be copied via a memcpy implement the `Pod` kind.
9581 * The `cfg` attribute can now be used on struct fields and enum variants.
9584 * std: The `option` and `result` API's have been overhauled to make them
9585 simpler, more consistent, and more composable.
9586 * std: The entire `std::io` module has been replaced with one that is
9587 more comprehensive and that properly interfaces with the underlying
9588 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9590 * std: `io::util` contains a number of useful implementations of
9591 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9592 `ZeroReader`, `TeeReader`.
9593 * std: The reference counted pointer type `extra::rc` moved into std.
9594 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9595 just a wrapper around it).
9596 * std: The `Either` type has been removed.
9597 * std: `fmt::Default` can be implemented for any type to provide default
9598 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9599 * std: The `rand` API continues to be tweaked.
9600 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9601 on failure in gdb, is now named `rust_fail`.
9602 * std: The `each_key` and `each_value` methods on `HashMap` have been
9603 replaced by the `keys` and `values` iterators.
9604 * std: Functions dealing with type size and alignment have moved from the
9605 `sys` module to the `mem` module.
9606 * std: The `path` module was written and API changed.
9607 * std: `str::from_utf8` has been changed to cast instead of allocate.
9608 * std: `starts_with` and `ends_with` methods added to vectors via the
9609 `ImmutableEqVector` trait, which is in the prelude.
9610 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9611 if the index is out of bounds.
9612 * std: Task failure no longer propagates between tasks, as the model was
9613 complex, expensive, and incompatible with thread-based tasks.
9614 * std: The `Any` type can be used for dynamic typing.
9615 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9617 * std: Methods that produce iterators generally do not have an `_iter`
9619 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9620 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9621 * std: `util::ignore` renamed to `prelude::drop`.
9622 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9624 * std: `vec::raw` has seen a lot of cleanup and API changes.
9625 * std: The standard library no longer includes any C++ code, and very
9626 minimal C, eliminating the dependency on libstdc++.
9627 * std: Runtime scheduling and I/O functionality has been factored out into
9628 extensible interfaces and is now implemented by two different crates:
9629 libnative, for native threading and I/O; and libgreen, for green threading
9630 and I/O. This paves the way for using the standard library in more limited
9631 embedded environments.
9632 * std: The `comm` module has been rewritten to be much faster, have a
9633 simpler, more consistent API, and to work for both native and green
9635 * std: All libuv dependencies have been moved into the rustuv crate.
9636 * native: New implementations of runtime scheduling on top of OS threads.
9637 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9639 * green: The green thread scheduler and message passing types are almost
9641 * extra: The `flatpipes` module had bitrotted and was removed.
9642 * extra: All crypto functions have been removed and Rust now has a policy of
9643 not reimplementing crypto in the standard library. In the future crypto
9644 will be provided by external crates with bindings to established libraries.
9645 * extra: `c_vec` has been modernized.
9646 * extra: The `sort` module has been removed. Use the `sort` method on
9650 * The `rust` and `rusti` commands have been removed, due to lack of
9652 * `rustdoc` was completely rewritten.
9653 * `rustdoc` can test code examples in documentation.
9654 * `rustpkg` can test packages with the argument, 'test'.
9655 * `rustpkg` supports arbitrary dependencies, including C libraries.
9656 * `rustc`'s support for generating debug info is improved again.
9657 * `rustc` has better error reporting for unbalanced delimiters.
9658 * `rustc`'s JIT support was removed due to bitrot.
9659 * Executables and static libraries can be built with LTO (-Z lto)
9660 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9664 Version 0.8 (2013-09-26)
9665 ============================
9667 * ~2200 changes, numerous bugfixes
9670 * The `for` loop syntax has changed to work with the `Iterator` trait.
9671 * At long last, unwinding works on Windows.
9672 * Default methods are ready for use.
9673 * Many trait inheritance bugs fixed.
9674 * Owned and borrowed trait objects work more reliably.
9675 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9676 * rustc can omit emission of code for the `debug!` macro if it is passed
9678 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9679 for foo.rs, then foo/mod.rs, and will generate an error when both are
9681 * Strings no longer contain trailing nulls. The new `std::c_str` module
9682 provides new mechanisms for converting to C strings.
9683 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9684 * The FFI has been overhauled such that foreign functions are called directly,
9685 instead of through a stack-switching wrapper.
9686 * Calling a foreign function must be done through a Rust function with the
9687 `#[fixed_stack_segment]` attribute.
9688 * The `externfn!` macro can be used to declare both a foreign function and
9689 a `#[fixed_stack_segment]` wrapper at once.
9690 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9691 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9692 * `priv` is disallowed everywhere except for struct fields and enum variants.
9693 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9694 * `ref` bindings in irrefutable patterns work correctly now.
9695 * `char` is now prevented from containing invalid code points.
9696 * Casting to `bool` is no longer allowed.
9697 * `\0` is now accepted as an escape in chars and strings.
9698 * `yield` is a reserved keyword.
9699 * `typeof` is a reserved keyword.
9700 * Crates may be imported by URL with `extern mod foo = "url";`.
9701 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9702 * Static vectors can be initialized with repeating elements,
9703 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9704 * Static structs can be initialized with functional record update,
9705 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9706 * `cfg!` can be used to conditionally execute code based on the crate
9707 configuration, similarly to `#[cfg(...)]`.
9708 * The `unnecessary_qualification` lint detects unneeded module
9709 prefixes (default: allow).
9710 * Arithmetic operations have been implemented on the SIMD types in
9711 `std::unstable::simd`.
9712 * Exchange allocation headers were removed, reducing memory usage.
9713 * `format!` implements a completely new, extensible, and higher-performance
9714 string formatting system. It will replace `fmt!`.
9715 * `print!` and `println!` write formatted strings (using the `format!`
9716 extension) to stdout.
9717 * `write!` and `writeln!` write formatted strings (using the `format!`
9718 extension) to the new Writers in `std::rt::io`.
9719 * The library section in which a function or static is placed may
9720 be specified with `#[link_section = "..."]`.
9721 * The `proto!` syntax extension for defining bounded message protocols
9723 * `macro_rules!` is hygienic for `let` declarations.
9724 * The `#[export_name]` attribute specifies the name of a symbol.
9725 * `unreachable!` can be used to indicate unreachable code, and fails
9729 * std: Transitioned to the new runtime, written in Rust.
9730 * std: Added an experimental I/O library, `rt::io`, based on the new
9732 * std: A new generic `range` function was added to the prelude, replacing
9733 `uint::range` and friends.
9734 * std: `range_rev` no longer exists. Since range is an iterator it can be
9735 reversed with `range(lo, hi).invert()`.
9736 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9737 renamed to `unwrap_or`.
9738 * std: The `iterator` module was renamed to `iter`.
9739 * std: Integral types now support the `checked_add`, `checked_sub`, and
9740 `checked_mul` operations for detecting overflow.
9741 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9743 * std: Methods are standardizing on conventions for casting methods:
9744 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9746 * std: The `CString` type in `c_str` provides new ways to convert to and
9748 * std: `DoubleEndedIterator` can yield elements in two directions.
9749 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9751 * std: `str::from_bytes` renamed to `str::from_utf8`.
9752 * std: `pop_opt` and `shift_opt` methods added to vectors.
9753 * std: The task-local data interface no longer uses @, and keys are
9754 no longer function pointers.
9755 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9756 * std: Added `SharedPort` to `comm`.
9757 * std: `Eq` has a default method for `ne`; only `eq` is required
9759 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9760 is required in implementations.
9761 * std: `is_utf8` performance is improved, impacting many string functions.
9762 * std: `os::MemoryMap` provides cross-platform mmap.
9763 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9764 are not 'in-bounds' are considered undefined.
9765 * std: Many freestanding functions in `vec` removed in favor of methods.
9766 * std: Many freestanding functions on scalar types removed in favor of
9768 * std: Many options to task builders were removed since they don't make
9769 sense in the new scheduler design.
9770 * std: More containers implement `FromIterator` so can be created by the
9772 * std: More complete atomic types in `unstable::atomics`.
9773 * std: `comm::PortSet` removed.
9774 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9775 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9776 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9777 default implementations.
9778 * std: Various `from_str` functions were removed in favor of a generic
9779 `from_str` which is available in the prelude.
9780 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9781 * extra: `dlist`, the doubly-linked list was modernized.
9782 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9783 * extra: Added `glob` module, replacing `std::os::glob`.
9784 * extra: `rope` was removed.
9785 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9786 * extra: `net`, and `timer` were removed. The experimental replacements
9787 are `std::rt::io::net` and `std::rt::io::timer`.
9788 * extra: Iterators implemented for `SmallIntMap`.
9789 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9790 * extra: `SmallIntSet` removed. Use `BitvSet`.
9791 * extra: Performance of JSON parsing greatly improved.
9792 * extra: `semver` updated to SemVer 2.0.0.
9793 * extra: `term` handles more terminals correctly.
9794 * extra: `dbg` module removed.
9795 * extra: `par` module removed.
9796 * extra: `future` was cleaned up, with some method renames.
9797 * extra: Most free functions in `getopts` were converted to methods.
9800 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9801 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9802 similarly to gcc's `--march` flag.
9803 * rustc's performance compiling small crates is much better.
9804 * rustpkg has received many improvements.
9805 * rustpkg supports git tags as package IDs.
9806 * rustpkg builds into target-specific directories so it can be used for
9808 * The number of concurrent test tasks is controlled by the environment
9809 variable RUST_TEST_TASKS.
9810 * The test harness can now report metrics for benchmarks.
9811 * All tools have man pages.
9812 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9813 * The runtime uses jemalloc for allocations.
9814 * Segmented stacks are temporarily disabled as part of the transition to
9815 the new runtime. Stack overflows are possible!
9816 * A new documentation backend, rustdoc_ng, is available for use. It is
9817 still invoked through the normal `rustdoc` command.
9820 Version 0.7 (2013-07-03)
9821 =======================
9823 * ~2000 changes, numerous bugfixes
9826 * `impl`s no longer accept a visibility qualifier. Put them on methods
9828 * The borrow checker has been rewritten with flow-sensitivity, fixing
9829 many bugs and inconveniences.
9830 * The `self` parameter no longer implicitly means `&'self self`,
9831 and can be explicitly marked with a lifetime.
9832 * Overloadable compound operators (`+=`, etc.) have been temporarily
9833 removed due to bugs.
9834 * The `for` loop protocol now requires `for`-iterators to return `bool`
9835 so they compose better.
9836 * The `Durable` trait is replaced with the `'static` bounds.
9837 * Trait default methods work more often.
9838 * Structs with the `#[packed]` attribute have byte alignment and
9839 no padding between fields.
9840 * Type parameters bound by `Copy` must now be copied explicitly with
9842 * It is now illegal to move out of a dereferenced unsafe pointer.
9843 * `Option<~T>` is now represented as a nullable pointer.
9844 * `@mut` does dynamic borrow checks correctly.
9845 * The `main` function is only detected at the topmost level of the crate.
9846 The `#[main]` attribute is still valid anywhere.
9847 * Struct fields may no longer be mutable. Use inherited mutability.
9848 * The `#[no_send]` attribute makes a type that would otherwise be
9850 * The `#[no_freeze]` attribute makes a type that would otherwise be
9852 * Unbounded recursion will abort the process after reaching the limit
9853 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9854 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9855 are never implicitly copyable.
9856 * `#[static_assert]` makes compile-time assertions about static bools.
9857 * At long last, 'argument modes' no longer exist.
9858 * The rarely used `use mod` statement no longer exists.
9861 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9863 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9864 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9866 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9867 and unsuffixed integer literals.
9870 * The `core` crate was renamed to `std`.
9871 * The `std` crate was renamed to `extra`.
9872 * More and improved documentation.
9873 * std: `iterator` module for external iterator objects.
9874 * Many old-style (internal, higher-order function) iterators replaced by
9875 implementations of `Iterator`.
9876 * std: Many old internal vector and string iterators,
9877 incl. `any`, `all`. removed.
9878 * std: The `finalize` method of `Drop` renamed to `drop`.
9879 * std: The `drop` method now takes `&mut self` instead of `&self`.
9880 * std: The prelude no longer re-exports any modules, only types and traits.
9881 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9882 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9883 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9884 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9885 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9886 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9887 * std: Many types implement `Clone`.
9888 * std: `path` type renamed to `Path`.
9889 * std: `mut` module and `Mut` type removed.
9890 * std: Many standalone functions removed in favor of methods and iterators
9891 in `vec`, `str`. In the future methods will also work as functions.
9892 * std: `reinterpret_cast` removed. Use `transmute`.
9893 * std: ascii string handling in `std::ascii`.
9894 * std: `Rand` is implemented for ~/@.
9895 * std: `run` module for spawning processes overhauled.
9896 * std: Various atomic types added to `unstable::atomic`.
9897 * std: Various types implement `Zero`.
9898 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9899 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9900 * std: Added `os::mkdir_recursive`.
9901 * std: Added `os::glob` function performs filesystems globs.
9902 * std: `FuzzyEq` renamed to `ApproxEq`.
9903 * std: `Map` now defines `pop` and `swap` methods.
9904 * std: `Cell` constructors converted to static methods.
9905 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9906 * extra: `flate` module moved from `std` to `extra`.
9907 * extra: `fileinput` module for iterating over a series of files.
9908 * extra: `Complex` number type and `complex` module.
9909 * extra: `Rational` number type and `rational` module.
9910 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9911 * extra: `term` uses terminfo now, is more correct.
9912 * extra: `arc` functions converted to methods.
9913 * extra: Implementation of fixed output size variations of SHA-2.
9916 * `unused_variables` lint mode for unused variables (default: warn).
9917 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9919 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9921 * `dead_assignment` lint mode for unread variables (default: warn).
9922 * `unnecessary_allocation` lint mode detects some heap allocations that are
9923 immediately borrowed so could be written without allocating (default: warn).
9924 * `missing_doc` lint mode (default: allow).
9925 * `unreachable_code` lint mode (default: warn).
9926 * The `rusti` command has been rewritten and a number of bugs addressed.
9927 * rustc outputs in color on more terminals.
9928 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9929 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9930 * Compiling with `-g` will make the binary record information about
9931 dynamic borrowcheck failures for debugging.
9932 * rustdoc has a nicer stylesheet.
9933 * Various improvements to rustdoc.
9934 * Improvements to rustpkg (see the detailed release notes).
9937 Version 0.6 (2013-04-03)
9938 ========================
9940 * ~2100 changes, numerous bugfixes
9943 * The self type parameter in traits is now spelled `Self`
9944 * The `self` parameter in trait and impl methods must now be explicitly
9945 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9946 * Static methods no longer require the `static` keyword and instead
9947 are distinguished by the lack of a `self` parameter
9948 * Replaced the `Durable` trait with the `'static` lifetime
9949 * The old closure type syntax with the trailing sigil has been
9950 removed in favor of the more consistent leading sigil
9951 * `super` is a keyword, and may be prefixed to paths
9952 * Trait bounds are separated with `+` instead of whitespace
9953 * Traits are implemented with `impl Trait for Type`
9954 instead of `impl Type: Trait`
9955 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9956 * The `export` keyword has finally been removed
9957 * The `move` keyword has been removed (see "Semantic changes")
9958 * The interior mutability qualifier on vectors, `[mut T]`, has been
9959 removed. Use `&mut [T]`, etc.
9960 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9961 * `fail` is no longer a keyword. Use `fail!()`
9962 * `assert` is no longer a keyword. Use `assert!()`
9963 * `log` is no longer a keyword. use `debug!`, etc.
9964 * 1-tuples may be represented as `(T,)`
9965 * Struct fields may no longer be `mut`. Use inherited mutability,
9966 `@mut T`, `core::mut` or `core::cell`
9967 * `extern mod { ... }` is no longer valid syntax for foreign
9968 function modules. Use extern blocks: `extern { ... }`
9969 * Newtype enums removed. Use tuple-structs.
9970 * Trait implementations no longer support visibility modifiers
9971 * Pattern matching over vectors improved and expanded
9972 * `const` renamed to `static` to correspond to lifetime name,
9973 and make room for future `static mut` unsafe mutable globals.
9974 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9975 * `Clone` implementations can be automatically generated with
9976 `#[deriving(Clone)]`
9977 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9978 instead of `foo as Bar`.
9979 * Fixed length vector types are now written as `[int, .. 3]`
9980 instead of `[int * 3]`.
9981 * Fixed length vector types can express the length as a constant
9982 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9985 * Types with owned pointers or custom destructors move by default,
9986 eliminating the `move` keyword
9987 * All foreign functions are considered unsafe
9988 * &mut is now unaliasable
9989 * Writes to borrowed @mut pointers are prevented dynamically
9991 * The name of the main function can be customized using #[main]
9992 * The default type of an inferred closure is &fn instead of @fn
9993 * `use` statements may no longer be "chained" - they cannot import
9994 identifiers imported by previous `use` statements
9995 * `use` statements are crate relative, importing from the "top"
9996 of the crate by default. Paths may be prefixed with `super::`
9997 or `self::` to change the search behavior.
9998 * Method visibility is inherited from the implementation declaration
9999 * Structural records have been removed
10000 * Many more types can be used in static items, including enums
10001 'static-lifetime pointers and vectors
10002 * Pattern matching over vectors improved and expanded
10003 * Typechecking of closure types has been overhauled to
10004 improve inference and eliminate unsoundness
10005 * Macros leave scope at the end of modules, unless that module is
10006 tagged with #[macro_escape]
10009 * Added big integers to `std::bigint`
10010 * Removed `core::oldcomm` module
10011 * Added pipe-based `core::comm` module
10012 * Numeric traits have been reorganized under `core::num`
10013 * `vec::slice` finally returns a slice
10014 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10015 * Containers reorganized around traits in `core::container`
10016 * `core::dvec` removed, `~[T]` is a drop-in replacement
10017 * `core::send_map` renamed to `core::hashmap`
10018 * `std::map` removed; replaced with `core::hashmap`
10019 * `std::treemap` reimplemented as an owned balanced tree
10020 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10021 * `core::trie` added as a fast ordered map for integer keys
10022 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10023 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10024 overload the comparison operators, whereas `TotalOrd` is used
10025 by certain container types
10028 * Replaced the 'cargo' package manager with 'rustpkg'
10029 * Added all-purpose 'rust' tool
10030 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10031 * rustc now *attempts* to offer spelling suggestions
10032 * Improved support for ARM and Android
10033 * Preliminary MIPS backend
10034 * Improved foreign function ABI implementation for x86, x86_64
10035 * Various memory usage improvements
10036 * Rust code may be embedded in foreign code under limited circumstances
10037 * Inline assembler supported by new asm!() syntax extension.
10040 Version 0.5 (2012-12-21)
10041 ===========================
10043 * ~900 changes, numerous bugfixes
10046 * Removed `<-` move operator
10047 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10048 * Removed old fixed length vector syntax - `[T]/N`
10049 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10050 * Macros may now expand to items and statements
10051 * `a.b()` is always parsed as a method call, never as a field projection
10052 * `Eq` and `IterBytes` implementations can be automatically generated
10053 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10054 * Removed the special crate language for `.rc` files
10055 * Function arguments may consist of any irrefutable pattern
10058 * `&` and `~` pointers may point to objects
10059 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10060 * Enum variants may be structs
10061 * Destructors can be added to all nominal types with the Drop trait
10062 * Structs and nullary enum variants may be constants
10063 * Values that cannot be implicitly copied are now automatically moved
10064 without writing `move` explicitly
10065 * `&T` may now be coerced to `*T`
10066 * Coercions happen in `let` statements as well as function calls
10067 * `use` statements now take crate-relative paths
10068 * The module and type namespaces have been merged so that static
10069 method names can be resolved under the trait in which they are
10072 * Improved support for language features
10073 * Trait inheritance works in many scenarios
10074 * More support for explicit self arguments in methods - `self`, `&self`
10075 `@self`, and `~self` all generally work as expected
10076 * Static methods work in more situations
10077 * Experimental: Traits may declare default methods for the implementations
10081 * New condition handling system in `core::condition`
10082 * Timsort added to `std::sort`
10083 * New priority queue, `std::priority_queue`
10084 * Pipes for serializable types, `std::flatpipes'
10085 * Serialization overhauled to be trait-based
10086 * Expanded `getopts` definitions
10087 * Moved futures to `std`
10088 * More functions are pure now
10089 * `core::comm` renamed to `oldcomm`. Still deprecated
10090 * `rustdoc` and `cargo` are libraries now
10093 * Added a preliminary REPL, `rusti`
10094 * License changed from MIT to dual MIT/APL2
10097 Version 0.4 (2012-10-15)
10098 ==========================
10100 * ~2000 changes, numerous bugfixes
10103 * All keywords are now strict and may not be used as identifiers anywhere
10104 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10105 'of', 'with', 'to', 'class'.
10106 * Classes are replaced with simpler structs
10107 * Explicit method self types
10108 * `ret` became `return` and `alt` became `match`
10109 * `import` is now `use`; `use is now `extern mod`
10110 * `extern mod { ... }` is now `extern { ... }`
10111 * `use mod` is the recommended way to import modules
10112 * `pub` and `priv` replace deprecated export lists
10113 * The syntax of `match` pattern arms now uses fat arrow (=>)
10114 * `main` no longer accepts an args vector; use `os::args` instead
10117 * Trait implementations are now coherent, ala Haskell typeclasses
10118 * Trait methods may be static
10119 * Argument modes are deprecated
10120 * Borrowed pointers are much more mature and recommended for use
10121 * Strings and vectors in the static region are stored in constant memory
10122 * Typestate was removed
10123 * Resolution rewritten to be more reliable
10124 * Support for 'dual-mode' data structures (freezing and thawing)
10127 * Most binary operators can now be overloaded via the traits in
10129 * `std::net::url` for representing URLs
10130 * Sendable hash maps in `core::send_map`
10131 * `core::task' gained a (currently unsafe) task-local storage API
10134 * An efficient new intertask communication primitive called the pipe,
10135 along with a number of higher-level channel types, in `core::pipes`
10136 * `std::arc`, an atomically reference counted, immutable, shared memory
10138 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10139 * Futures are now based on pipes and sendable
10140 * More robust linked task failure
10141 * Improved task builder API
10144 * Improved error reporting
10145 * Preliminary JIT support
10146 * Preliminary work on precise GC
10147 * Extensive architectural improvements to rustc
10148 * Begun a transition away from buggy C++-based reflection (shape) code to
10149 Rust-based (visitor) code
10150 * All hash functions and tables converted to secure, randomized SipHash
10153 Version 0.3 (2012-07-12)
10154 ========================
10156 * ~1900 changes, numerous bugfixes
10158 * New coding conveniences
10159 * Integer-literal suffix inference
10160 * Per-item control over warnings, errors
10161 * #[cfg(windows)] and #[cfg(unix)] attributes
10162 * Documentation comments
10163 * More compact closure syntax
10164 * 'do' expressions for treating higher-order functions as
10166 * *-patterns (wildcard extended to all constructor fields)
10169 * Name resolution pass and exhaustiveness checker rewritten
10170 * Region pointers and borrow checking supersede alias
10172 * Init-ness checking is now provided by a region-based liveness
10173 pass instead of the typestate pass; same for last-use analysis
10174 * Extensive work on region pointers
10176 * Experimental new language features
10177 * Slices and fixed-size, interior-allocated vectors
10178 * #!-comments for lang versioning, shell execution
10179 * Destructors and iface implementation for classes;
10180 type-parameterized classes and class methods
10181 * 'const' type kind for types that can be used to implement
10182 shared-memory concurrency patterns
10186 * Removal of various obsolete features
10187 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10188 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10190 * Constructs: do-while loops ('do' repurposed), fn binding,
10191 resources (replaced by destructors)
10193 * Compiler reorganization
10194 * Syntax-layer of compiler split into separate crate
10195 * Clang (from LLVM project) integrated into build
10196 * Typechecker split into sub-modules
10199 * New time functions
10200 * Extension methods for many built-in types
10201 * Arc: atomic-refcount read-only / exclusive-use shared cells
10202 * Par: parallel map and search routines
10203 * Extensive work on libuv interface
10204 * Much vector code moved to libraries
10205 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10206 #include, #include_str, #include_bin
10208 * Tool improvements
10209 * Cargo automatically resolves dependencies
10212 Version 0.2 (2012-03-29)
10213 =========================
10215 * >1500 changes, numerous bugfixes
10217 * New docs and doc tooling
10219 * New port: FreeBSD x86_64
10221 * Compilation model enhancements
10222 * Generics now specialized, multiply instantiated
10223 * Functions now inlined across separate crates
10225 * Scheduling, stack and threading fixes
10226 * Noticeably improved message-passing performance
10227 * Explicit schedulers
10231 * Experimental new language features
10232 * Operator overloading
10236 * Various language extensions
10237 * C-callback function types: 'crust fn ...'
10238 * Infinite-loop construct: 'loop { ... }'
10239 * Shorten 'mutable' to 'mut'
10240 * Required mutable-local qualifier: 'let mut ...'
10241 * Basic glob-exporting: 'export foo::*;'
10242 * Alt now exhaustive, 'alt check' for runtime-checked
10243 * Block-function form of 'for' loop, with 'break' and 'ret'.
10246 * AST quasi-quote syntax extension
10247 * Revived libuv interface
10248 * New modules: core::{future, iter}, std::arena
10249 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10250 * Extensive cleanup, regularization in libstd, libcore
10253 Version 0.1 (2012-01-20)
10254 ===============================
10256 * Most language features work, including:
10257 * Unique pointers, unique closures, move semantics
10258 * Interface-constrained generics
10259 * Static interface dispatch
10261 * Multithread task scheduling
10262 * Typestate predicates
10263 * Failure unwinding, destructors
10264 * Pattern matching and destructuring assignment
10265 * Lightweight block-lambda syntax
10266 * Preliminary macro-by-example
10268 * Compiler works with the following configurations:
10269 * Linux: x86 and x86_64 hosts and targets
10270 * macOS: x86 and x86_64 hosts and targets
10271 * Windows: x86 hosts and targets
10273 * Cross compilation / multi-target configuration supported.
10275 * Preliminary API-documentation and package-management tools included.
10279 * Documentation is incomplete.
10281 * Performance is below intended target.
10283 * Standard library APIs are subject to extensive change, reorganization.
10285 * Language-level versioning is not yet operational - future code will
10286 break unexpectedly.