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 calling `.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]
323 - [Turn `#[derive]` into a regular macro attribute][79078]
325 [84136]: https://github.com/rust-lang/rust/issues/84136
326 [80763]: https://github.com/rust-lang/rust/pull/80763
327 [82166]: https://github.com/rust-lang/rust/pull/82166
328 [82121]: https://github.com/rust-lang/rust/pull/82121
329 [81879]: https://github.com/rust-lang/rust/pull/81879
330 [82261]: https://github.com/rust-lang/rust/pull/82261
331 [82218]: https://github.com/rust-lang/rust/pull/82218
332 [82216]: https://github.com/rust-lang/rust/pull/82216
333 [82202]: https://github.com/rust-lang/rust/pull/82202
334 [81855]: https://github.com/rust-lang/rust/pull/81855
335 [81766]: https://github.com/rust-lang/rust/pull/81766
336 [81744]: https://github.com/rust-lang/rust/pull/81744
337 [81611]: https://github.com/rust-lang/rust/pull/81611
338 [81479]: https://github.com/rust-lang/rust/pull/81479
339 [81451]: https://github.com/rust-lang/rust/pull/81451
340 [81356]: https://github.com/rust-lang/rust/pull/81356
341 [80962]: https://github.com/rust-lang/rust/pull/80962
342 [80553]: https://github.com/rust-lang/rust/pull/80553
343 [80527]: https://github.com/rust-lang/rust/pull/80527
344 [79519]: https://github.com/rust-lang/rust/pull/79519
345 [79423]: https://github.com/rust-lang/rust/pull/79423
346 [79208]: https://github.com/rust-lang/rust/pull/79208
347 [78429]: https://github.com/rust-lang/rust/pull/78429
348 [82733]: https://github.com/rust-lang/rust/pull/82733
349 [82594]: https://github.com/rust-lang/rust/pull/82594
350 [79078]: https://github.com/rust-lang/rust/pull/79078
351 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
352 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
353 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
354 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
355 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
356 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
357 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
358 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
359 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
360 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
361 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
362 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
363 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
364 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
365 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
366 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
367 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
368 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
369 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
370 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
371 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
372 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
374 Version 1.51.0 (2021-03-25)
375 ============================
379 - [You can now parameterize items such as functions, traits, and `struct`s by constant
380 values in addition to by types and lifetimes.][79135] Also known as "const generics"
381 E.g. you can now write the following. Note: Only values of primitive integers,
382 `bool`, or `char` types are currently permitted.
384 struct GenericArray<T, const LENGTH: usize> {
388 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
389 const fn last(&self) -> Option<&T> {
393 Some(&self.inner[LENGTH - 1])
403 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
404 This option controls whether debug information is split across multiple files
405 or packed into a single file. **Note** This option is unstable on other platforms.
406 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
407 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
408 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
409 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
411 \* Refer to Rust's [platform support page][platform-support-doc] for more
412 information on Rust's tiered platform support.
417 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
418 - [`str` now implements `AsMut<str>`.][80279]
419 - [`u64` and `u128` now implement `From<char>`.][79502]
420 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
421 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
422 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
423 - [`io::Empty` now implements `io::Seek`.][78044]
424 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
425 `T: ?Sized` types.][80764]
426 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
432 - [`Arc::decrement_strong_count`]
433 - [`Arc::increment_strong_count`]
434 - [`Once::call_once_force`]
435 - [`Peekable::next_if_eq`]
436 - [`Peekable::next_if`]
437 - [`Seek::stream_position`]
438 - [`array::IntoIter`]
439 - [`panic::panic_any`]
441 - [`ptr::addr_of_mut!`]
442 - [`slice::fill_with`]
443 - [`slice::split_inclusive_mut`]
444 - [`slice::split_inclusive`]
445 - [`slice::strip_prefix`]
446 - [`slice::strip_suffix`]
447 - [`str::split_inclusive`]
448 - [`sync::OnceState`]
450 - [`VecDeque::range`]
451 - [`VecDeque::range_mut`]
455 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
456 codegen option.][cargo/9112]
457 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
458 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
459 to avoid unifying features of dependencies where that unification could be unwanted.
460 Such as using the same dependency with a `std` feature in a build scripts and
461 proc-macros, while using the `no-std` feature in the final binary. See the
462 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
467 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
468 - [You can now provide a `--default-theme` flag which sets the default theme to use for
469 documentation.][79642]
471 Various improvements to intra-doc links:
473 - [You can link to non-path primitives such as `slice`.][80181]
474 - [You can link to associated items.][74489]
475 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
479 - [You can now pass `--include-ignored` to tests (e.g. with
480 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
485 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
486 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
488 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
489 for the distributed artifacts.][81521]
490 - `armv5te-unknown-linux-gnueabi`
491 - `sparc64-unknown-linux-gnu`
492 - `thumbv7neon-unknown-linux-gnueabihf`
493 - `armv7-unknown-linux-gnueabi`
494 - `x86_64-unknown-linux-gnux32`
495 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
500 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
502 [79135]: https://github.com/rust-lang/rust/pull/79135
503 [74489]: https://github.com/rust-lang/rust/pull/74489
504 [76934]: https://github.com/rust-lang/rust/pull/76934
505 [79570]: https://github.com/rust-lang/rust/pull/79570
506 [80181]: https://github.com/rust-lang/rust/pull/80181
507 [79642]: https://github.com/rust-lang/rust/pull/79642
508 [80945]: https://github.com/rust-lang/rust/pull/80945
509 [80279]: https://github.com/rust-lang/rust/pull/80279
510 [80053]: https://github.com/rust-lang/rust/pull/80053
511 [79502]: https://github.com/rust-lang/rust/pull/79502
512 [75180]: https://github.com/rust-lang/rust/pull/75180
513 [79135]: https://github.com/rust-lang/rust/pull/79135
514 [81521]: https://github.com/rust-lang/rust/pull/81521
515 [80968]: https://github.com/rust-lang/rust/pull/80968
516 [80959]: https://github.com/rust-lang/rust/pull/80959
517 [80718]: https://github.com/rust-lang/rust/pull/80718
518 [80653]: https://github.com/rust-lang/rust/pull/80653
519 [80579]: https://github.com/rust-lang/rust/pull/80579
520 [79998]: https://github.com/rust-lang/rust/pull/79998
521 [78044]: https://github.com/rust-lang/rust/pull/78044
522 [81455]: https://github.com/rust-lang/rust/pull/81455
523 [80764]: https://github.com/rust-lang/rust/pull/80764
524 [80749]: https://github.com/rust-lang/rust/pull/80749
525 [80662]: https://github.com/rust-lang/rust/pull/80662
526 [79134]: https://github.com/rust-lang/rust/pull/79134
527 [80966]: https://github.com/rust-lang/rust/pull/80966
528 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
529 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
530 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
531 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
532 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
533 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
534 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
535 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
536 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
537 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
538 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
539 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
540 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
541 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
542 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
543 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
544 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
545 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
546 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
547 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
548 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
549 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
550 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
552 Version 1.50.0 (2021-02-11)
553 ============================
556 -----------------------
557 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
558 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
559 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
562 -----------------------
563 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
564 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
565 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
566 - [Dropped support for all cloudabi targets.][78439]
568 \* Refer to Rust's [platform support page][platform-support-doc] for more
569 information on Rust's tiered platform support.
572 -----------------------
574 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
575 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
576 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
577 This value cannot be a valid file descriptor, and now means `Option<File>` takes
578 up the same amount of space as `File`.
584 - [`btree_map::Entry::or_insert_with_key`]
587 - [`hash_map::Entry::or_insert_with_key`]
591 - [`UnsafeCell::get_mut`]
593 The following previously stable methods are now `const`.
595 - [`IpAddr::is_ipv4`]
596 - [`IpAddr::is_ipv6`]
597 - [`IpAddr::is_unspecified`]
598 - [`IpAddr::is_loopback`]
599 - [`IpAddr::is_multicast`]
600 - [`Ipv4Addr::octets`]
601 - [`Ipv4Addr::is_loopback`]
602 - [`Ipv4Addr::is_private`]
603 - [`Ipv4Addr::is_link_local`]
604 - [`Ipv4Addr::is_multicast`]
605 - [`Ipv4Addr::is_broadcast`]
606 - [`Ipv4Addr::is_documentation`]
607 - [`Ipv4Addr::to_ipv6_compatible`]
608 - [`Ipv4Addr::to_ipv6_mapped`]
609 - [`Ipv6Addr::segments`]
610 - [`Ipv6Addr::is_unspecified`]
611 - [`Ipv6Addr::is_loopback`]
612 - [`Ipv6Addr::is_multicast`]
613 - [`Ipv6Addr::to_ipv4`]
616 - [`Layout::from_size_align`]
617 - `pow` for all integer types.
618 - `checked_pow` for all integer types.
619 - `saturating_pow` for all integer types.
620 - `wrapping_pow` for all integer types.
621 - `next_power_of_two` for all unsigned integer types.
622 - `checked_next_power_of_two` for all unsigned integer types.
625 -----------------------
627 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
628 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
629 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
630 contents of that directory for changes.][cargo/8973]
631 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
636 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
637 - [Running tests will now print the total time taken to execute.][75752]
642 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
643 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
644 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
645 unhygenic `macro_rules!` macros.][79472]
646 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
647 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
648 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
649 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
650 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
651 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
653 [74989]: https://github.com/rust-lang/rust/pull/74989
654 [79261]: https://github.com/rust-lang/rust/pull/79261
655 [79896]: https://github.com/rust-lang/rust/pull/79896
656 [79484]: https://github.com/rust-lang/rust/pull/79484
657 [79472]: https://github.com/rust-lang/rust/pull/79472
658 [79270]: https://github.com/rust-lang/rust/pull/79270
659 [79003]: https://github.com/rust-lang/rust/pull/79003
660 [78864]: https://github.com/rust-lang/rust/pull/78864
661 [78636]: https://github.com/rust-lang/rust/pull/78636
662 [78439]: https://github.com/rust-lang/rust/pull/78439
663 [78343]: https://github.com/rust-lang/rust/pull/78343
664 [78296]: https://github.com/rust-lang/rust/pull/78296
665 [78068]: https://github.com/rust-lang/rust/pull/78068
666 [75752]: https://github.com/rust-lang/rust/pull/75752
667 [74699]: https://github.com/rust-lang/rust/pull/74699
668 [78142]: https://github.com/rust-lang/rust/pull/78142
669 [77484]: https://github.com/rust-lang/rust/pull/77484
670 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
671 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
672 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
673 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
674 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
675 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
676 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
677 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
678 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
679 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
680 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
681 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
682 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
683 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
684 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
685 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
686 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
687 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
688 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
689 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
690 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
691 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
692 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
693 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
694 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
695 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
696 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
697 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
698 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
699 [`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
700 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
701 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
702 [`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
703 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
706 Version 1.49.0 (2020-12-31)
707 ============================
710 -----------------------
712 - [Unions can now implement `Drop`, and you can now have a field in a union
713 with `ManuallyDrop<T>`.][77547]
714 - [You can now cast uninhabited enums to integers.][76199]
715 - [You can now bind by reference and by move in patterns.][76119] This
716 allows you to selectively borrow individual components of a type. E.g.
724 let person = Person {
725 name: String::from("Alice"),
729 // `name` is moved out of person, but `age` is referenced.
730 let Person { name, ref age } = person;
731 println!("{} {}", name, age);
735 -----------------------
737 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
738 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
739 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
740 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
741 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
742 - [Output from threads spawned in tests is now captured.][78227]
743 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
745 \* Refer to Rust's [platform support page][platform-support-doc] for more
746 information on Rust's tiered platform support.
749 -----------------------
751 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
752 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
757 - [`slice::select_nth_unstable`]
758 - [`slice::select_nth_unstable_by`]
759 - [`slice::select_nth_unstable_by_key`]
761 The following previously stable methods are now `const`.
764 - [`Poll::is_pending`]
767 -----------------------
768 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
769 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
770 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
771 variable will be set if the crate being built is one the user selected to build, either
772 with `-p` or through defaults.
773 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
779 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
780 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
781 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
782 Previously such invalid or unused attributes could be ignored.
783 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
784 read [this post about the changes][rustdoc-ws-post] for more details.
785 - [Trait bounds are no longer inferred for associated types.][79904]
789 These changes provide no direct user facing benefits, but represent significant
790 improvements to the internals and overall performance of rustc and
793 - [rustc's internal crates are now compiled using the `initial-exec` Thread
794 Local Storage model.][78201]
795 - [Calculate visibilities once in resolve.][78077]
796 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
797 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
800 [75991]: https://github.com/rust-lang/rust/pull/75991
801 [78951]: https://github.com/rust-lang/rust/pull/78951
802 [78848]: https://github.com/rust-lang/rust/pull/78848
803 [78746]: https://github.com/rust-lang/rust/pull/78746
804 [78376]: https://github.com/rust-lang/rust/pull/78376
805 [78228]: https://github.com/rust-lang/rust/pull/78228
806 [78227]: https://github.com/rust-lang/rust/pull/78227
807 [78201]: https://github.com/rust-lang/rust/pull/78201
808 [78109]: https://github.com/rust-lang/rust/pull/78109
809 [78077]: https://github.com/rust-lang/rust/pull/78077
810 [77997]: https://github.com/rust-lang/rust/pull/77997
811 [77703]: https://github.com/rust-lang/rust/pull/77703
812 [77547]: https://github.com/rust-lang/rust/pull/77547
813 [77015]: https://github.com/rust-lang/rust/pull/77015
814 [76199]: https://github.com/rust-lang/rust/pull/76199
815 [76119]: https://github.com/rust-lang/rust/pull/76119
816 [75914]: https://github.com/rust-lang/rust/pull/75914
817 [79004]: https://github.com/rust-lang/rust/pull/79004
818 [78676]: https://github.com/rust-lang/rust/pull/78676
819 [79904]: https://github.com/rust-lang/rust/issues/79904
820 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
821 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
822 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
823 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
824 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
825 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
826 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
827 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
828 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
829 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
830 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
832 Version 1.48.0 (2020-11-19)
833 ==========================
838 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
839 is still rejected *semantically*, but can now be parsed by procedural macros.
843 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
844 `rustc` whether to link its own C runtime and libraries or to rely on a external
845 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
846 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
847 Note: If you're using cargo you must explicitly pass the `--target` flag.
848 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
850 \* Refer to Rust's [platform support page][platform-support-doc] for more
851 information on Rust's tiered platform support.
855 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
856 and `&Stderr`.][76275]
857 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
858 - [The `matches!` macro now supports having a trailing comma.][74880]
859 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
860 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
864 - [`slice::as_ptr_range`]
865 - [`slice::as_mut_ptr_range`]
866 - [`VecDeque::make_contiguous`]
867 - [`future::pending`]
870 The following previously stable methods are now `const fn`'s:
872 - [`Option::is_some`]
873 - [`Option::is_none`]
878 - [`Ordering::reverse`]
886 - [You can now link to items in `rustdoc` using the intra-doc link
887 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
888 a link to `std::future`'s documentation. See ["Linking to items by
889 name"][intradoc-links] for more information.
890 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
891 when searching through `rustdoc`'s UI.][75740]
895 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
896 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
897 promoted to `'static` lifetime any more inside `const fn`s.
898 - [Associated type bindings on trait objects are now verified to meet the bounds
899 declared on the trait when checking that they implement the trait.][27675]
900 - [When trait bounds on associated types or opaque types are ambiguous, the
901 compiler no longer makes an arbitrary choice on which bound to use.][54121]
902 - [Fixed recursive nonterminals not being expanded in macros during
903 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
904 correctly handling recursive nonterminal tokens.
905 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
906 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
907 in places where they have no effect.][73461]
908 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
909 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
910 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
911 disallow zero-initialization.][71274]
912 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
913 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
914 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
915 see the [`catch_unwind`] documentation for further information.
921 These changes provide no direct user facing benefits, but represent significant
922 improvements to the internals and overall performance of rustc and
925 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
926 You can continue building with `make` by setting `ninja=false` in
928 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
929 - [Made `ensure_sufficient_stack()` non-generic][76680]
931 [78143]: https://github.com/rust-lang/rust/issues/78143
932 [76680]: https://github.com/rust-lang/rust/pull/76680/
933 [76030]: https://github.com/rust-lang/rust/pull/76030/
934 [70212]: https://github.com/rust-lang/rust/pull/70212/
935 [27675]: https://github.com/rust-lang/rust/issues/27675/
936 [54121]: https://github.com/rust-lang/rust/issues/54121/
937 [71274]: https://github.com/rust-lang/rust/pull/71274/
938 [77386]: https://github.com/rust-lang/rust/pull/77386/
939 [77153]: https://github.com/rust-lang/rust/pull/77153/
940 [77055]: https://github.com/rust-lang/rust/pull/77055/
941 [76275]: https://github.com/rust-lang/rust/pull/76275/
942 [76310]: https://github.com/rust-lang/rust/pull/76310/
943 [76420]: https://github.com/rust-lang/rust/pull/76420/
944 [76158]: https://github.com/rust-lang/rust/pull/76158/
945 [75857]: https://github.com/rust-lang/rust/pull/75857/
946 [75585]: https://github.com/rust-lang/rust/pull/75585/
947 [75740]: https://github.com/rust-lang/rust/pull/75740/
948 [75502]: https://github.com/rust-lang/rust/pull/75502/
949 [74880]: https://github.com/rust-lang/rust/pull/74880/
950 [74922]: https://github.com/rust-lang/rust/pull/74922/
951 [74430]: https://github.com/rust-lang/rust/pull/74430/
952 [74194]: https://github.com/rust-lang/rust/pull/74194/
953 [73461]: https://github.com/rust-lang/rust/pull/73461/
954 [73166]: https://github.com/rust-lang/rust/pull/73166/
955 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
956 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
957 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
958 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
959 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
960 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
961 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
962 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
963 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
964 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
965 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
966 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
967 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
968 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
969 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
972 Version 1.47.0 (2020-10-08)
973 ==========================
977 - [Closures will now warn when not used.][74869]
981 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
982 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
984 - [Upgraded to LLVM 11.][73526]
985 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
986 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
987 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
989 \* Refer to Rust's [platform support page][platform-support-doc] for more
990 information on Rust's tiered platform support.
994 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
995 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
996 those of length less than 33.][74060]
997 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
998 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
999 `PartialEq`, and `PartialOrd`.][73583]
1003 - [`Ident::new_raw`]
1004 - [`Range::is_empty`]
1005 - [`RangeInclusive::is_empty`]
1006 - [`Result::as_deref`]
1007 - [`Result::as_deref_mut`]
1009 - [`pointer::offset_from`]
1013 The following previously stable APIs have now been made const.
1015 - [The `new` method for all `NonZero` integers.][73858]
1016 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1017 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1018 methods for all integers.][73858]
1019 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1020 signed integers.][73858]
1021 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1022 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1023 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1024 `is_ascii_control` methods for `char` and `u8`.][73858]
1028 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1029 You can override this by setting the following in your `Cargo.toml`.
1031 [profile.release.build-override]
1034 - [`cargo-help` will now display man pages for commands rather just the
1035 `--help` text.][cargo/8456]
1036 - [`cargo-metadata` now emits a `test` field indicating if a target has
1037 tests enabled.][cargo/8478]
1038 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1039 - [`cargo-publish` will now use an alternative registry by default if it's the
1040 only registry specified in `package.publish`.][cargo/8571]
1044 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1045 type based search.][75366]
1046 - [Added the Ayu theme to rustdoc.][71237]
1050 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1051 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1052 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1053 help to preserve more span information.][73084] These changes may cause
1054 compiliation errors if your macro was unhygenic or didn't correctly handle
1056 - [Moved support for the CloudABI target to tier 3.][75568]
1057 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1058 - [Added the `rustc-docs` component.][75560] This allows you to install
1059 and read the documentation for the compiler internal APIs. (Currently only
1060 available for `x86_64-unknown-linux-gnu`.)
1065 - [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.
1067 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1068 [75048]: https://github.com/rust-lang/rust/pull/75048/
1069 [74163]: https://github.com/rust-lang/rust/pull/74163/
1070 [71237]: https://github.com/rust-lang/rust/pull/71237/
1071 [74869]: https://github.com/rust-lang/rust/pull/74869/
1072 [73858]: https://github.com/rust-lang/rust/pull/73858/
1073 [75716]: https://github.com/rust-lang/rust/pull/75716/
1074 [75908]: https://github.com/rust-lang/rust/pull/75908/
1075 [75516]: https://github.com/rust-lang/rust/pull/75516/
1076 [75560]: https://github.com/rust-lang/rust/pull/75560/
1077 [75568]: https://github.com/rust-lang/rust/pull/75568/
1078 [75366]: https://github.com/rust-lang/rust/pull/75366/
1079 [75204]: https://github.com/rust-lang/rust/pull/75204/
1080 [74650]: https://github.com/rust-lang/rust/pull/74650/
1081 [74419]: https://github.com/rust-lang/rust/pull/74419/
1082 [73964]: https://github.com/rust-lang/rust/pull/73964/
1083 [74021]: https://github.com/rust-lang/rust/pull/74021/
1084 [74060]: https://github.com/rust-lang/rust/pull/74060/
1085 [73893]: https://github.com/rust-lang/rust/pull/73893/
1086 [73526]: https://github.com/rust-lang/rust/pull/73526/
1087 [73583]: https://github.com/rust-lang/rust/pull/73583/
1088 [73084]: https://github.com/rust-lang/rust/pull/73084/
1089 [73197]: https://github.com/rust-lang/rust/pull/73197/
1090 [72488]: https://github.com/rust-lang/rust/pull/72488/
1091 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1092 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1093 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1094 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1095 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1096 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1097 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1098 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1099 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1100 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1101 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1102 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1103 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1104 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1105 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1108 Version 1.46.0 (2020-08-27)
1109 ==========================
1113 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1114 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1115 const functions.][73862]
1116 - [The `#[track_caller]` attribute can now be added to functions to use the
1117 function's caller's location information for panic messages.][72445]
1118 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1119 `x.0.0` over `(x.0).0`.
1120 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1121 You currently can't use `mem::transmute` in constant functions.
1125 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1126 - [Enabled static "Position Independent Executables" by default
1127 for `x86_64-unknown-linux-musl`.][70740]
1131 - [`mem::forget` is now a `const fn`.][73887]
1132 - [`String` now implements `From<char>`.][73466]
1133 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1134 integer types.][73032]
1135 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1136 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1137 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1138 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1139 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1140 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1145 - [`vec::Drain::as_slice`]
1149 Added a number of new environment variables that are now available when
1150 compiling your crate.
1152 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1153 the specific binary being compiled and the name of the crate.
1154 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1155 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1159 - [The target configuration option `abi_blacklist` has been renamed
1160 to `unsupported_abis`.][74150] The old name will still continue to work.
1161 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1162 This was previously accepted but will become a hard error in a future release.
1163 - [Rustc will fail to compile if you have a struct with
1164 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1166 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1167 ensure that spans have the correct information, and may cause breakage if you
1168 were relying on receiving spans with dummy information.
1169 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1170 a legacy installer that was replaced by a MSI installer a few years ago but
1171 was still being built.
1172 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1173 - [Rustc will no longer accept overlapping trait implementations that only
1174 differ in how the lifetime was bound.][72493]
1175 - [Rustc now correctly relates the lifetime of an existential associated
1176 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1177 you to pass a shorter lifetime than expected.
1178 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1179 The library will need to be installed for `rustc` to work, even though we
1180 expect it to be already available on most systems.
1181 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1183 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1184 exact output returned by rustc's pretty printing is an unstable
1185 implementation detail: we recommend any macro relying on it to switch to a
1186 more robust parsing system.
1188 [75453]: https://github.com/rust-lang/rust/issues/75453/
1189 [74820]: https://github.com/rust-lang/rust/issues/74820/
1190 [74420]: https://github.com/rust-lang/rust/issues/74420/
1191 [74109]: https://github.com/rust-lang/rust/pull/74109/
1192 [74150]: https://github.com/rust-lang/rust/pull/74150/
1193 [73862]: https://github.com/rust-lang/rust/pull/73862/
1194 [73887]: https://github.com/rust-lang/rust/pull/73887/
1195 [73466]: https://github.com/rust-lang/rust/pull/73466/
1196 [73516]: https://github.com/rust-lang/rust/pull/73516/
1197 [73293]: https://github.com/rust-lang/rust/pull/73293/
1198 [73007]: https://github.com/rust-lang/rust/pull/73007/
1199 [73032]: https://github.com/rust-lang/rust/pull/73032/
1200 [72920]: https://github.com/rust-lang/rust/pull/72920/
1201 [72569]: https://github.com/rust-lang/rust/pull/72569/
1202 [72583]: https://github.com/rust-lang/rust/pull/72583/
1203 [72584]: https://github.com/rust-lang/rust/pull/72584/
1204 [72717]: https://github.com/rust-lang/rust/pull/72717/
1205 [72437]: https://github.com/rust-lang/rust/pull/72437/
1206 [72445]: https://github.com/rust-lang/rust/pull/72445/
1207 [72486]: https://github.com/rust-lang/rust/pull/72486/
1208 [72493]: https://github.com/rust-lang/rust/pull/72493/
1209 [72331]: https://github.com/rust-lang/rust/pull/72331/
1210 [71896]: https://github.com/rust-lang/rust/pull/71896/
1211 [71660]: https://github.com/rust-lang/rust/pull/71660/
1212 [71322]: https://github.com/rust-lang/rust/pull/71322/
1213 [70740]: https://github.com/rust-lang/rust/pull/70740/
1214 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1215 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1216 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1217 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1218 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1221 Version 1.45.2 (2020-08-03)
1222 ==========================
1224 * [Fix bindings in tuple struct patterns][74954]
1225 * [Fix track_caller integration with trait objects][74784]
1227 [74954]: https://github.com/rust-lang/rust/issues/74954
1228 [74784]: https://github.com/rust-lang/rust/issues/74784
1231 Version 1.45.1 (2020-07-30)
1232 ==========================
1234 * [Fix const propagation with references.][73613]
1235 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1236 * [Avoid spurious implicit region bound.][74509]
1237 * [Install clippy on x.py install][74457]
1239 [73613]: https://github.com/rust-lang/rust/pull/73613
1240 [73078]: https://github.com/rust-lang/rust/issues/73078
1241 [74509]: https://github.com/rust-lang/rust/pull/74509
1242 [74457]: https://github.com/rust-lang/rust/pull/74457
1245 Version 1.45.0 (2020-07-16)
1246 ==========================
1250 - [Out of range float to int conversions using `as` has been defined as a saturating
1251 conversion.][71269] This was previously undefined behaviour, but you can use the
1252 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1253 may be desirable in rare performance sensitive situations.
1254 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1255 using `u64`.][70705]
1256 - [Function like procedural macros can now be used in expression, pattern, and statement
1257 positions.][68717] This means you can now use a function-like procedural macro
1258 anywhere you can use a declarative (`macro_rules!`) macro.
1262 - [You can now override individual target features through the `target-feature`
1263 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1264 equivalent to `-C target-feature=+avx2,+fma`.
1265 - [Added the `force-unwind-tables` flag.][69984] This option allows
1266 rustc to always generate unwind tables regardless of panic strategy.
1267 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1268 to include LLVM bitcode into generated `rlib`s (this is on by default).
1269 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1270 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1271 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1272 - [Upgraded to LLVM 10.][67759]
1274 \* Refer to Rust's [platform support page][platform-support-doc] for more
1275 information on Rust's tiered platform support.
1280 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1282 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1283 - [You can now use `char` with
1284 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1285 a range of codepoints.][72413] E.g.
1286 you can now write the following;
1288 for ch in 'a'..='z' {
1292 // Prints "abcdefghijklmnopqrstuvwxyz"
1294 - [`OsString` now implements `FromStr`.][71662]
1295 - [The `saturating_neg` method has been added to all signed integer primitive
1296 types, and the `saturating_abs` method has been added for all integer
1297 primitive types.][71886]
1298 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1299 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1301 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1302 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1303 integer types.][69813]
1304 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1305 integer types.][72324]
1306 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1311 - [`BTreeMap::remove_entry`]
1313 - [`rc::Weak::as_ptr`]
1314 - [`rc::Weak::from_raw`]
1315 - [`rc::Weak::into_raw`]
1316 - [`str::strip_prefix`]
1317 - [`str::strip_suffix`]
1318 - [`sync::Weak::as_ptr`]
1319 - [`sync::Weak::from_raw`]
1320 - [`sync::Weak::into_raw`]
1321 - [`char::UNICODE_VERSION`]
1322 - [`Span::resolved_at`]
1323 - [`Span::located_at`]
1324 - [`Span::mixed_site`]
1325 - [`unix::process::CommandExt::arg0`]
1330 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1335 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1336 `~~outdated information~~` becomes "~~outdated information~~".
1337 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1341 - [Trying to self initialize a static value (that is creating a value using
1342 itself) is unsound and now causes a compile error.][71140]
1343 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1344 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1345 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1346 previously undocumented and not intended for public use. Rustdoc still provides
1347 a non-zero exit code on errors.
1348 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1349 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1350 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1351 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1352 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1356 - [Make clippy a git subtree instead of a git submodule][70655]
1357 - [Unify the undo log of all snapshot types][69464]
1359 [71848]: https://github.com/rust-lang/rust/issues/71848/
1360 [73420]: https://github.com/rust-lang/rust/issues/73420/
1361 [72324]: https://github.com/rust-lang/rust/pull/72324/
1362 [71843]: https://github.com/rust-lang/rust/pull/71843/
1363 [71886]: https://github.com/rust-lang/rust/pull/71886/
1364 [72234]: https://github.com/rust-lang/rust/pull/72234/
1365 [72239]: https://github.com/rust-lang/rust/pull/72239/
1366 [72397]: https://github.com/rust-lang/rust/pull/72397/
1367 [72413]: https://github.com/rust-lang/rust/pull/72413/
1368 [72014]: https://github.com/rust-lang/rust/pull/72014/
1369 [72062]: https://github.com/rust-lang/rust/pull/72062/
1370 [72094]: https://github.com/rust-lang/rust/pull/72094/
1371 [72133]: https://github.com/rust-lang/rust/pull/72133/
1372 [67759]: https://github.com/rust-lang/rust/pull/67759/
1373 [71900]: https://github.com/rust-lang/rust/pull/71900/
1374 [71928]: https://github.com/rust-lang/rust/pull/71928/
1375 [71662]: https://github.com/rust-lang/rust/pull/71662/
1376 [71716]: https://github.com/rust-lang/rust/pull/71716/
1377 [71447]: https://github.com/rust-lang/rust/pull/71447/
1378 [71269]: https://github.com/rust-lang/rust/pull/71269/
1379 [71095]: https://github.com/rust-lang/rust/pull/71095/
1380 [71140]: https://github.com/rust-lang/rust/pull/71140/
1381 [70655]: https://github.com/rust-lang/rust/pull/70655/
1382 [70705]: https://github.com/rust-lang/rust/pull/70705/
1383 [69984]: https://github.com/rust-lang/rust/pull/69984/
1384 [69813]: https://github.com/rust-lang/rust/pull/69813/
1385 [69464]: https://github.com/rust-lang/rust/pull/69464/
1386 [68717]: https://github.com/rust-lang/rust/pull/68717/
1387 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1388 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1389 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1390 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1391 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1392 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1393 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1394 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1395 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1396 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1397 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1398 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1399 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1400 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1401 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1402 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1403 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1406 Version 1.44.1 (2020-06-18)
1407 ===========================
1409 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1410 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1411 * [Fix crashes when finding backtrace on macOS.][71397]
1412 * [Clippy applies lint levels into different files.][clippy/5356]
1414 [71397]: https://github.com/rust-lang/rust/issues/71397
1415 [73078]: https://github.com/rust-lang/rust/issues/73078
1416 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1417 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1420 Version 1.44.0 (2020-06-04)
1421 ==========================
1425 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1426 - [Added the `unused_braces` lint.][70081]
1428 **Syntax-only changes**
1430 - [Expansion-driven outline module parsing][69838]
1435 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1440 These are still rejected semantically, so you will likely receive an error but
1441 these changes can be seen and parsed by macros and conditional compilation.
1445 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1446 Additionally when in incremental mode rustc defaults to 256 codegen units.
1447 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1448 a panic is thrown.][67502]
1449 - [Added tier 3\* support for the `aarch64-unknown-none` and
1450 `aarch64-unknown-none-softfloat` targets.][68334]
1451 - [Added tier 3 support for `arm64-apple-tvos` and
1452 `x86_64-apple-tvos` targets.][68191]
1457 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1458 `vec![]` to be able to be used in `const` contexts.
1459 - [`convert::Infallible` now implements `Hash`.][70281]
1460 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1461 a `&mut OsStr`.][70048]
1462 - [Unicode 13 is now supported.][69929]
1463 - [`String` now implements `From<&mut str>`.][69661]
1464 - [`IoSlice` now implements `Copy`.][69403]
1465 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1466 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1467 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1468 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1469 integer types.][69373]
1473 - [`PathBuf::with_capacity`]
1474 - [`PathBuf::capacity`]
1475 - [`PathBuf::clear`]
1476 - [`PathBuf::reserve`]
1477 - [`PathBuf::reserve_exact`]
1478 - [`PathBuf::shrink_to_fit`]
1479 - [`f32::to_int_unchecked`]
1480 - [`f64::to_int_unchecked`]
1481 - [`Layout::align_to`]
1482 - [`Layout::pad_to_align`]
1484 - [`Layout::extend`]
1488 - [Added the `cargo tree` command which will print a tree graph of
1489 your dependencies.][cargo/8062] E.g.
1491 mdbook v0.3.2 (/Users/src/rust/mdbook)
1493 │ ├── html5ever v0.24.0
1495 │ │ │ └── cfg-if v0.1.9
1497 │ │ └── markup5ever v0.9.0
1498 │ │ ├── log v0.4.8 (*)
1500 │ │ │ └── phf_shared v0.7.24
1501 │ │ │ ├── siphasher v0.2.3
1502 │ │ │ └── unicase v1.4.2
1503 │ │ │ [build-dependencies]
1504 │ │ │ └── version_check v0.1.5
1507 You can also display dependencies on multiple versions of the same crate with
1508 `cargo tree -d` (short for `cargo tree --duplicates`).
1512 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1513 the version in the sidebar.][69494]
1517 - [Rustc now correctly generates static libraries on Windows GNU targets with
1518 the `.a` extension, rather than the previous `.lib`.][70937]
1519 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1520 - [The `file_name` property in JSON output of macro errors now points the actual
1521 source file rather than the previous format of `<NAME macros>`.][70969]
1522 **Note:** this may not point to a file that actually exists on the user's system.
1523 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1524 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1525 not allow zero initialization such as `NonZeroU8`.][66059] This was
1526 previously a warning.
1527 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1528 operator has been defined as a saturating operation.][71269] This was previously
1529 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1530 continue using the current behaviour, which may be desirable in rare performance
1531 sensitive situations.
1535 These changes provide no direct user facing benefits, but represent significant
1536 improvements to the internals and overall performance of rustc and
1539 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1540 - [Replace big JS dict with JSON parsing.][71250]
1542 [69373]: https://github.com/rust-lang/rust/pull/69373/
1543 [66059]: https://github.com/rust-lang/rust/pull/66059/
1544 [68191]: https://github.com/rust-lang/rust/pull/68191/
1545 [68899]: https://github.com/rust-lang/rust/pull/68899/
1546 [71147]: https://github.com/rust-lang/rust/pull/71147/
1547 [71250]: https://github.com/rust-lang/rust/pull/71250/
1548 [70937]: https://github.com/rust-lang/rust/pull/70937/
1549 [70969]: https://github.com/rust-lang/rust/pull/70969/
1550 [70632]: https://github.com/rust-lang/rust/pull/70632/
1551 [70281]: https://github.com/rust-lang/rust/pull/70281/
1552 [70345]: https://github.com/rust-lang/rust/pull/70345/
1553 [70048]: https://github.com/rust-lang/rust/pull/70048/
1554 [70081]: https://github.com/rust-lang/rust/pull/70081/
1555 [70156]: https://github.com/rust-lang/rust/pull/70156/
1556 [71269]: https://github.com/rust-lang/rust/pull/71269/
1557 [69838]: https://github.com/rust-lang/rust/pull/69838/
1558 [69929]: https://github.com/rust-lang/rust/pull/69929/
1559 [69661]: https://github.com/rust-lang/rust/pull/69661/
1560 [69778]: https://github.com/rust-lang/rust/pull/69778/
1561 [69494]: https://github.com/rust-lang/rust/pull/69494/
1562 [69403]: https://github.com/rust-lang/rust/pull/69403/
1563 [69033]: https://github.com/rust-lang/rust/pull/69033/
1564 [68692]: https://github.com/rust-lang/rust/pull/68692/
1565 [68334]: https://github.com/rust-lang/rust/pull/68334/
1566 [67502]: https://github.com/rust-lang/rust/pull/67502/
1567 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1568 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1569 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1570 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1571 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1572 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1573 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1574 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1575 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1576 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1577 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1578 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1579 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1582 Version 1.43.1 (2020-05-07)
1583 ===========================
1585 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1586 * [Fixed the stabilization of AVX-512 features.][71473]
1587 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1589 [71430]: https://github.com/rust-lang/rust/pull/71430
1590 [71473]: https://github.com/rust-lang/rust/issues/71473
1591 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1594 Version 1.43.0 (2020-04-23)
1595 ==========================
1599 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1600 the type inferred correctly.][68129]
1601 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1603 **Syntax only changes**
1604 - [Allow `type Foo: Ord` syntactically.][69361]
1605 - [Fuse associated and extern items up to defaultness.][69194]
1606 - [Syntactically allow `self` in all `fn` contexts.][68764]
1607 - [Merge `fn` syntax + cleanup item parsing.][68728]
1608 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1609 For example, you may now write:
1611 macro_rules! mac_trait {
1621 These are still rejected *semantically*, so you will likely receive an error but
1622 these changes can be seen and parsed by macros and
1623 conditional compilation.
1628 - [You can now pass multiple lint flags to rustc to override the previous
1629 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1630 everything in the `unused` lint group except `unused-variables` which
1631 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1632 everything in the `unused` lint group **including** `unused-variables` since
1633 the allow flag is specified before the deny flag (and therefore overridden).
1634 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1635 if they are available on `windows-gnu`.][67429]
1636 - [rustc now buffers errors/warnings printed in JSON.][69227]
1640 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1641 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1642 respectively.][69538] **Note** These conversions are only available when `N`
1644 - [You can now use associated constants on floats and integers directly, rather
1645 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1646 `f32::NAN` with no imports.
1647 - [`u8::is_ascii` is now `const`.][68984]
1648 - [`String` now implements `AsMut<str>`.][68742]
1649 - [Added the `primitive` module to `std` and `core`.][67637] This module
1650 reexports Rust's primitive types. This is mainly useful in macros
1651 where you want avoid these types being shadowed.
1652 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1653 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1657 - [`Once::is_completed`]
1662 - [`iter::once_with`]
1666 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1667 your environment.][cargo/7823]
1668 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1669 executable path when running integration tests or benchmarks.][cargo/7697]
1670 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1671 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1675 - [Certain checks in the `const_err` lint were deemed unrelated to const
1676 evaluation][69185], and have been moved to the `unconditional_panic` and
1677 `arithmetic_overflow` lints.
1682 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1683 has been a warning since 1.36.0.
1684 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1685 led to some instances being accepted, and now correctly emits a hard error.
1687 [69340]: https://github.com/rust-lang/rust/pull/69340
1691 These changes provide no direct user facing benefits, but represent significant
1692 improvements to the internals and overall performance of `rustc` and
1695 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1696 - [Improved how rustc generates drop code.][67332]
1697 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1698 - [traits: preallocate 2 Vecs of known initial size][69022]
1699 - [Avoid exponential behaviour when relating types][68772]
1700 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1701 - [Improve performance of coherence checks][68966]
1702 - [Deduplicate types in the generator witness][68672]
1703 - [Invert control in struct_lint_level.][68725]
1705 [67332]: https://github.com/rust-lang/rust/pull/67332/
1706 [67429]: https://github.com/rust-lang/rust/pull/67429/
1707 [67637]: https://github.com/rust-lang/rust/pull/67637/
1708 [67642]: https://github.com/rust-lang/rust/pull/67642/
1709 [67878]: https://github.com/rust-lang/rust/pull/67878/
1710 [67885]: https://github.com/rust-lang/rust/pull/67885/
1711 [68129]: https://github.com/rust-lang/rust/pull/68129/
1712 [68672]: https://github.com/rust-lang/rust/pull/68672/
1713 [68725]: https://github.com/rust-lang/rust/pull/68725/
1714 [68728]: https://github.com/rust-lang/rust/pull/68728/
1715 [68738]: https://github.com/rust-lang/rust/pull/68738/
1716 [68742]: https://github.com/rust-lang/rust/pull/68742/
1717 [68764]: https://github.com/rust-lang/rust/pull/68764/
1718 [68772]: https://github.com/rust-lang/rust/pull/68772/
1719 [68943]: https://github.com/rust-lang/rust/pull/68943/
1720 [68952]: https://github.com/rust-lang/rust/pull/68952/
1721 [68966]: https://github.com/rust-lang/rust/pull/68966/
1722 [68984]: https://github.com/rust-lang/rust/pull/68984/
1723 [69022]: https://github.com/rust-lang/rust/pull/69022/
1724 [69185]: https://github.com/rust-lang/rust/pull/69185/
1725 [69194]: https://github.com/rust-lang/rust/pull/69194/
1726 [69201]: https://github.com/rust-lang/rust/pull/69201/
1727 [69227]: https://github.com/rust-lang/rust/pull/69227/
1728 [69548]: https://github.com/rust-lang/rust/pull/69548/
1729 [69256]: https://github.com/rust-lang/rust/pull/69256/
1730 [69361]: https://github.com/rust-lang/rust/pull/69361/
1731 [69366]: https://github.com/rust-lang/rust/pull/69366/
1732 [69538]: https://github.com/rust-lang/rust/pull/69538/
1733 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1734 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1735 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1736 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1737 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1738 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1739 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1740 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1743 Version 1.42.0 (2020-03-12)
1744 ==========================
1748 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1750 fn foo(words: &[&str]) {
1752 ["Hello", "World", "!", ..] => println!("Hello World!"),
1753 ["Foo", "Bar", ..] => println!("Baz"),
1754 rest => println!("{:?}", rest),
1758 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1759 that you can create an enum that has the exact layout and ABI of the type
1761 - [There are some *syntax-only* changes:][67131]
1762 - `default` is syntactically allowed before items in `trait` definitions.
1763 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1764 leave out their bodies in favor of `;`.
1765 - Bounds on associated types in `impl`s are now syntactically allowed
1766 (e.g. `type Foo: Ord;`).
1767 - `...` (the C-variadic type) may occur syntactically directly as the type of
1768 any function parameter.
1770 These are still rejected *semantically*, so you will likely receive an error
1771 but these changes can be seen and parsed by procedural macros and
1772 conditional compilation.
1776 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1777 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1778 - [`Option::{expect,unwrap}` and
1779 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1780 pointing to the location where they were called, rather than
1781 `core`'s internals. ][67887]
1783 \* Refer to Rust's [platform support page][platform-support-doc] for more
1784 information on Rust's tiered platform support.
1788 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1789 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1790 to implement `Sized`.][67935]
1791 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1792 - [`Layout::new` is now `const`.][66254]
1793 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1798 - [`CondVar::wait_while`]
1799 - [`CondVar::wait_timeout_while`]
1801 - [`DebugMap::value`]
1802 - [`ManuallyDrop::take`]
1804 - [`ptr::slice_from_raw_parts_mut`]
1805 - [`ptr::slice_from_raw_parts`]
1809 - [You no longer need to include `extern crate proc_macro;` to be able to
1810 `use proc_macro;` in the `2018` edition.][cargo/7700]
1814 - [`Error::description` has been deprecated, and its use will now produce a
1815 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1817 [68253]: https://github.com/rust-lang/rust/pull/68253/
1818 [68348]: https://github.com/rust-lang/rust/pull/68348/
1819 [67935]: https://github.com/rust-lang/rust/pull/67935/
1820 [68339]: https://github.com/rust-lang/rust/pull/68339/
1821 [68122]: https://github.com/rust-lang/rust/pull/68122/
1822 [67712]: https://github.com/rust-lang/rust/pull/67712/
1823 [67887]: https://github.com/rust-lang/rust/pull/67887/
1824 [67131]: https://github.com/rust-lang/rust/pull/67131/
1825 [67233]: https://github.com/rust-lang/rust/pull/67233/
1826 [66899]: https://github.com/rust-lang/rust/pull/66899/
1827 [66919]: https://github.com/rust-lang/rust/pull/66919/
1828 [66254]: https://github.com/rust-lang/rust/pull/66254/
1829 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1830 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1831 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1832 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1833 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1834 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1835 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1836 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1837 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1840 Version 1.41.1 (2020-02-27)
1841 ===========================
1843 * [Always check types of static items][69145]
1844 * [Always check lifetime bounds of `Copy` impls][69145]
1845 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1847 [69225]: https://github.com/rust-lang/rust/issues/69225
1848 [69145]: https://github.com/rust-lang/rust/pull/69145
1851 Version 1.41.0 (2020-01-30)
1852 ===========================
1857 - [You can now pass type parameters to foreign items when implementing
1858 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1859 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1860 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1861 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1862 - [You can now use any valid identifier in a `format_args` macro.][66847]
1863 Previously identifiers starting with an underscore were not allowed.
1864 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1865 enum variants.][66183] These are still rejected semantically, but
1866 can be seen and parsed by procedural macros and conditional compilation.
1871 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1872 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1873 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1874 - [You can now pass an arguments file passing the `@path` syntax
1875 to rustc.][66172] Note that the format differs somewhat from what is
1876 found in other tooling; please see [the documentation][argfile-docs] for
1878 - [You can now provide `--extern` flag without a path, indicating that it is
1879 available from the search path or specified with an `-L` flag.][64882]
1881 \* Refer to Rust's [platform support page][platform-support-doc] for more
1882 information on Rust's tiered platform support.
1884 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1889 - [The `core::panic` module is now stable.][66771] It was already stable
1891 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1892 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1893 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1898 - [`Result::map_or`]
1899 - [`Result::map_or_else`]
1900 - [`std::rc::Weak::weak_count`]
1901 - [`std::rc::Weak::strong_count`]
1902 - [`std::sync::Weak::weak_count`]
1903 - [`std::sync::Weak::strong_count`]
1908 - [Cargo will now document all the private items for binary crates
1909 by default.][cargo/7593]
1910 - [`cargo-install` will now reinstall the package if it detects that it is out
1911 of date.][cargo/7560]
1912 - [Cargo.lock now uses a more git friendly format that should help to reduce
1913 merge conflicts.][cargo/7579]
1914 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1915 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1916 optimisation level to `2` for debug builds. You can also use
1917 `[profile.<profile>.build-override]` to override build scripts and
1923 - [You can now specify `edition` in documentation code blocks to compile the block
1924 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1925 should be compiled the 2018 edition of Rust.
1926 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1927 current theme with `--check-theme`.][54733]
1928 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1933 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1934 Apple targets.][apple-32bit-drop] This means that the source code is still
1935 available to build, but the targets are no longer being tested and release
1936 binaries for those platforms will no longer be distributed by the Rust project.
1937 Please refer to the linked blog post for more information.
1939 [54733]: https://github.com/rust-lang/rust/pull/54733/
1940 [61351]: https://github.com/rust-lang/rust/pull/61351/
1941 [67255]: https://github.com/rust-lang/rust/pull/67255/
1942 [66661]: https://github.com/rust-lang/rust/pull/66661/
1943 [66771]: https://github.com/rust-lang/rust/pull/66771/
1944 [66847]: https://github.com/rust-lang/rust/pull/66847/
1945 [66238]: https://github.com/rust-lang/rust/pull/66238/
1946 [66277]: https://github.com/rust-lang/rust/pull/66277/
1947 [66325]: https://github.com/rust-lang/rust/pull/66325/
1948 [66172]: https://github.com/rust-lang/rust/pull/66172/
1949 [66183]: https://github.com/rust-lang/rust/pull/66183/
1950 [65879]: https://github.com/rust-lang/rust/pull/65879/
1951 [65013]: https://github.com/rust-lang/rust/pull/65013/
1952 [64882]: https://github.com/rust-lang/rust/pull/64882/
1953 [64325]: https://github.com/rust-lang/rust/pull/64325/
1954 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1955 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1956 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1957 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1958 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1959 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1960 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1961 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1962 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1963 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1964 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1966 Version 1.40.0 (2019-12-19)
1967 ===========================
1971 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1972 `const` contexts.][65188] e.g.
1975 pub struct Point(i32, i32);
1977 const ORIGIN: Point = {
1978 let constructor = Point;
1984 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1985 indicate that there may be variants or fields added in the future.][64639]
1986 For example this requires adding a wild-card branch (`_ => {}`) to any match
1987 statements on a non-exhaustive `enum`. [(RFC 2008)]
1988 - [You can now use function-like procedural macros in `extern` blocks and in
1989 type positions.][63931] e.g. `type Generated = macro!();`
1990 - [Function-like and attribute procedural macros can now emit
1991 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1992 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1993 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1994 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1998 - [Added tier 3 support\* for the
1999 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2000 - [Added tier 3 support for the
2001 `aarch64-unknown-none-softfloat` target.][64589]
2002 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2003 `mips64el-unknown-linux-muslabi64` targets.][65843]
2005 \* Refer to Rust's [platform support page][platform-support-doc] for more
2006 information on Rust's tiered platform support.
2010 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2014 - [`BTreeMap::get_key_value`]
2015 - [`HashMap::get_key_value`]
2016 - [`Option::as_deref_mut`]
2017 - [`Option::as_deref`]
2018 - [`Option::flatten`]
2019 - [`UdpSocket::peer_addr`]
2020 - [`f32::to_be_bytes`]
2021 - [`f32::to_le_bytes`]
2022 - [`f32::to_ne_bytes`]
2023 - [`f64::to_be_bytes`]
2024 - [`f64::to_le_bytes`]
2025 - [`f64::to_ne_bytes`]
2026 - [`f32::from_be_bytes`]
2027 - [`f32::from_le_bytes`]
2028 - [`f32::from_ne_bytes`]
2029 - [`f64::from_be_bytes`]
2030 - [`f64::from_le_bytes`]
2031 - [`f64::from_ne_bytes`]
2038 - [Cargo will now always display warnings, rather than only on
2039 fresh builds.][cargo/7450]
2040 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2041 now produce an error.][cargo/7507] Previously these flags were ignored.
2042 - [You can now publish `dev-dependencies` without including
2043 a `version`.][cargo/7333]
2047 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2048 when running documentation tests with `rustdoc`.][63803]
2052 - [As previously announced, any previous NLL warnings in the 2015 edition are
2053 now hard errors.][64221]
2054 - [The `include!` macro will now warn if it failed to include the
2055 entire file.][64284] The `include!` macro unintentionally only includes the
2056 first _expression_ in a file, and this can be unintuitive. This will become
2057 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2058 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2059 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2060 or `extern` blocks now correctly emits a hard error.
2062 [65294]: https://github.com/rust-lang/rust/pull/65294/
2063 [66103]: https://github.com/rust-lang/rust/pull/66103/
2064 [65843]: https://github.com/rust-lang/rust/pull/65843/
2065 [65188]: https://github.com/rust-lang/rust/pull/65188/
2066 [65092]: https://github.com/rust-lang/rust/pull/65092/
2067 [64589]: https://github.com/rust-lang/rust/pull/64589/
2068 [64639]: https://github.com/rust-lang/rust/pull/64639/
2069 [64221]: https://github.com/rust-lang/rust/pull/64221/
2070 [64284]: https://github.com/rust-lang/rust/pull/64284/
2071 [63931]: https://github.com/rust-lang/rust/pull/63931/
2072 [64035]: https://github.com/rust-lang/rust/pull/64035/
2073 [63674]: https://github.com/rust-lang/rust/pull/63674/
2074 [63803]: https://github.com/rust-lang/rust/pull/63803/
2075 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2076 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2077 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2078 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2079 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2080 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2081 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2082 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2083 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2084 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2085 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2086 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2087 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2088 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2089 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2090 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2091 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2092 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2093 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2094 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2095 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2096 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2097 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2098 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2099 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2100 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2103 Version 1.39.0 (2019-11-07)
2104 ===========================
2108 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2109 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2110 - [You can now use certain attributes on function, closure, and function pointer
2111 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2112 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2113 attributes applied to items. e.g.
2116 #[cfg(windows)] slice: &[u16],
2117 #[cfg(not(windows))] slice: &[u8],
2122 - [You can now take shared references to bind-by-move patterns in the `if` guards
2123 of `match` arms.][63118] e.g.
2126 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2130 // ---- `nums` is bound by move.
2131 if nums.iter().sum::<u8>() == 10
2132 // ^------ `.iter()` implicitly takes a reference to `nums`.
2135 // ----------- Legal as `nums` was bound by move and so we have ownership.
2137 _ => unreachable!(),
2146 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2147 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2148 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2149 **Note** Cargo currently doesn't use this feature. Refer to
2150 [cargo#7315][cargo/7315] to track this feature's progress.
2151 - [You can now pass `--show-output` argument to test binaries to print the
2152 output of successful tests.][62600]
2155 \* Refer to Rust's [platform support page][platform-support-doc] for more
2156 information on Rust's tiered platform support.
2160 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2161 - [`LinkedList::new` is now a `const` function.][63684]
2162 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2163 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2164 now `const`.][63786]
2168 - [`Pin::into_inner`]
2169 - [`Instant::checked_duration_since`]
2170 - [`Instant::saturating_duration_since`]
2174 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2175 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2176 `--all` is now deprecated.
2180 - [You can now pass `-Clinker` to rustdoc to control the linker used
2181 for compiling doctests.][63834]
2185 - [Code that was previously accepted by the old borrow checker, but rejected by
2186 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2187 previously a warning, and will also become a hard error in the Rust 2015
2188 edition in the 1.40.0 release.
2189 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2190 run tests.][63827] This should improve performance when running a large
2192 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2193 recommended to use the `?` operator instead.
2194 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2197 [62600]: https://github.com/rust-lang/rust/pull/62600/
2198 [62672]: https://github.com/rust-lang/rust/pull/62672/
2199 [63118]: https://github.com/rust-lang/rust/pull/63118/
2200 [63209]: https://github.com/rust-lang/rust/pull/63209/
2201 [63402]: https://github.com/rust-lang/rust/pull/63402/
2202 [63565]: https://github.com/rust-lang/rust/pull/63565/
2203 [63595]: https://github.com/rust-lang/rust/pull/63595/
2204 [63684]: https://github.com/rust-lang/rust/pull/63684/
2205 [63698]: https://github.com/rust-lang/rust/pull/63698/
2206 [63770]: https://github.com/rust-lang/rust/pull/63770/
2207 [63786]: https://github.com/rust-lang/rust/pull/63786/
2208 [63827]: https://github.com/rust-lang/rust/pull/63827/
2209 [63834]: https://github.com/rust-lang/rust/pull/63834/
2210 [63927]: https://github.com/rust-lang/rust/pull/63927/
2211 [63933]: https://github.com/rust-lang/rust/pull/63933/
2212 [63934]: https://github.com/rust-lang/rust/pull/63934/
2213 [63938]: https://github.com/rust-lang/rust/pull/63938/
2214 [63940]: https://github.com/rust-lang/rust/pull/63940/
2215 [63941]: https://github.com/rust-lang/rust/pull/63941/
2216 [63945]: https://github.com/rust-lang/rust/pull/63945/
2217 [64010]: https://github.com/rust-lang/rust/pull/64010/
2218 [64028]: https://github.com/rust-lang/rust/pull/64028/
2219 [64334]: https://github.com/rust-lang/rust/pull/64334/
2220 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2221 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2222 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2223 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2224 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2225 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2227 Version 1.38.0 (2019-09-26)
2228 ==========================
2232 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2233 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2237 - [Added pipelined compilation support to `rustc`.][62766] This will
2238 improve compilation times in some cases. For further information please refer
2239 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2240 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2241 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2242 `x86_64-uwp-windows-msvc` targets.][60260]
2243 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2244 `armv7-unknown-linux-musleabi` targets.][63107]
2245 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2246 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2247 - [Upgraded to LLVM 9.][62592]
2249 \* Refer to Rust's [platform support page][platform-support-doc] for more
2250 information on Rust's tiered platform support.
2254 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2255 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2256 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2257 is available at `std::clone::Clone`). This also makes all built-in macros
2258 available in `std`/`core` root. e.g. `std::include_bytes!`.
2259 - [`str::Chars` now implements `Debug`.][63000]
2260 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2261 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2262 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2263 - [Added euclidean remainder and division operations (`div_euclid`,
2264 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2265 `overflowing`, and `wrapping` versions are available for all
2267 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2268 `PartialEq`.][61491]
2269 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2273 - [`<*const T>::cast`]
2274 - [`<*mut T>::cast`]
2275 - [`Duration::as_secs_f32`]
2276 - [`Duration::as_secs_f64`]
2277 - [`Duration::div_f32`]
2278 - [`Duration::div_f64`]
2279 - [`Duration::from_secs_f32`]
2280 - [`Duration::from_secs_f64`]
2281 - [`Duration::mul_f32`]
2282 - [`Duration::mul_f64`]
2283 - [`any::type_name`]
2287 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2288 - [You can now pass the `--features` option multiple times to enable
2289 multiple features.][cargo/7084]
2294 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2298 - [`rustc` will now warn about some incorrect uses of
2299 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2303 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2305 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2306 issues][62896] with certain crates such as libc.
2308 [60260]: https://github.com/rust-lang/rust/pull/60260/
2309 [61457]: https://github.com/rust-lang/rust/pull/61457/
2310 [61491]: https://github.com/rust-lang/rust/pull/61491/
2311 [61884]: https://github.com/rust-lang/rust/pull/61884/
2312 [61953]: https://github.com/rust-lang/rust/pull/61953/
2313 [62042]: https://github.com/rust-lang/rust/pull/62042/
2314 [62528]: https://github.com/rust-lang/rust/pull/62528/
2315 [62583]: https://github.com/rust-lang/rust/pull/62583/
2316 [62735]: https://github.com/rust-lang/rust/pull/62735/
2317 [62766]: https://github.com/rust-lang/rust/pull/62766/
2318 [62784]: https://github.com/rust-lang/rust/pull/62784/
2319 [62592]: https://github.com/rust-lang/rust/pull/62592/
2320 [62785]: https://github.com/rust-lang/rust/issues/62785/
2321 [62814]: https://github.com/rust-lang/rust/pull/62814/
2322 [62896]: https://github.com/rust-lang/rust/issues/62896/
2323 [63000]: https://github.com/rust-lang/rust/pull/63000/
2324 [63056]: https://github.com/rust-lang/rust/pull/63056/
2325 [63107]: https://github.com/rust-lang/rust/pull/63107/
2326 [63346]: https://github.com/rust-lang/rust/pull/63346/
2327 [63421]: https://github.com/rust-lang/rust/pull/63421/
2328 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2329 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2330 [63048]: https://github.com/rust-lang/rust/pull/63048
2331 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2332 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2333 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2334 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2335 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2336 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2337 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2338 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2339 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2340 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2341 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2342 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2343 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2345 Version 1.37.0 (2019-08-15)
2346 ==========================
2350 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2351 [`Box`][62228], or an [array][62235] and unused.
2352 - [You can now use the `cfg` and `cfg_attr` attributes on
2353 generic parameters.][61547]
2354 - [You can now use enum variants through type alias.][61682] e.g. You can
2355 write the following:
2357 type MyOption = Option<u8>;
2359 fn increment_or_zero(x: MyOption) -> u8 {
2361 MyOption::Some(y) => y + 1,
2362 MyOption::None => 0,
2366 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2367 `const _: u32 = 5;`.
2368 - [You can now use `#[repr(align(X)]` on enums.][61229]
2369 - [The `?` Kleene macro operator is now available in the
2370 2015 edition.][60932]
2374 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2375 and `-C profile-use` flags.][61268] For more information on how to use profile
2376 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2377 - [The `rust-lldb` wrapper script should now work again.][61827]
2381 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2385 - [`BufReader::buffer`]
2386 - [`BufWriter::buffer`]
2387 - [`Cell::from_mut`]
2388 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2389 - [`DoubleEndedIterator::nth_back`]
2391 - [`Wrapping::reverse_bits`]
2392 - [`i128::reverse_bits`]
2393 - [`i16::reverse_bits`]
2394 - [`i32::reverse_bits`]
2395 - [`i64::reverse_bits`]
2396 - [`i8::reverse_bits`]
2397 - [`isize::reverse_bits`]
2398 - [`slice::copy_within`]
2399 - [`u128::reverse_bits`]
2400 - [`u16::reverse_bits`]
2401 - [`u32::reverse_bits`]
2402 - [`u64::reverse_bits`]
2403 - [`u8::reverse_bits`]
2404 - [`usize::reverse_bits`]
2408 - [`Cargo.lock` files are now included by default when publishing executable crates
2409 with executables.][cargo/7026]
2410 - [You can now specify `default-run="foo"` in `[package]` to specify the
2411 default executable to use for `cargo run`.][cargo/7056]
2418 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2419 Please transition your code to using the `..=` syntax for inclusive
2421 - [Using a trait object without the `dyn` will now warn by default.][61203]
2422 Please transition your code to use `dyn Trait` for trait objects instead.
2424 [62228]: https://github.com/rust-lang/rust/pull/62228/
2425 [62235]: https://github.com/rust-lang/rust/pull/62235/
2426 [61802]: https://github.com/rust-lang/rust/pull/61802/
2427 [61827]: https://github.com/rust-lang/rust/pull/61827/
2428 [61547]: https://github.com/rust-lang/rust/pull/61547/
2429 [61682]: https://github.com/rust-lang/rust/pull/61682/
2430 [61268]: https://github.com/rust-lang/rust/pull/61268/
2431 [61342]: https://github.com/rust-lang/rust/pull/61342/
2432 [61347]: https://github.com/rust-lang/rust/pull/61347/
2433 [61100]: https://github.com/rust-lang/rust/pull/61100/
2434 [61203]: https://github.com/rust-lang/rust/pull/61203/
2435 [61229]: https://github.com/rust-lang/rust/pull/61229/
2436 [60932]: https://github.com/rust-lang/rust/pull/60932/
2437 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2438 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2439 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2440 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2441 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2442 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2443 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2444 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2445 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2446 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2447 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2448 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2449 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2450 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2451 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2452 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2453 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2454 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2455 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2456 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2457 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2458 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2459 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2460 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2463 Version 1.36.0 (2019-07-04)
2464 ==========================
2468 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2469 - [The order of traits in trait objects no longer affects the semantics of that
2470 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2471 `dyn fmt::Debug + Send`, where this was previously not the case.
2475 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2476 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2477 - [`mem::needs_drop` is now available as a const fn.][60364]
2478 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2479 - [`String` now implements `BorrowMut<str>`.][60404]
2480 - [`io::Cursor` now implements `Default`.][60234]
2481 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2482 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2483 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2484 environment has access to heap memory allocation.
2485 - [`String` now implements `From<&String>`.][59825]
2486 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2487 return a tuple of each argument when there is multiple arguments.
2488 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2493 - [`VecDeque::rotate_left`]
2494 - [`VecDeque::rotate_right`]
2495 - [`Iterator::copied`]
2497 - [`io::IoSliceMut`]
2498 - [`Read::read_vectored`]
2499 - [`Write::write_vectored`]
2500 - [`str::as_mut_ptr`]
2501 - [`mem::MaybeUninit`]
2502 - [`pointer::align_offset`]
2503 - [`future::Future`]
2505 - [`task::RawWaker`]
2506 - [`task::RawWakerVTable`]
2512 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2513 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2515 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2519 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2526 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2527 longer recommended, and will be deprecated in 1.39.0.
2529 [60318]: https://github.com/rust-lang/rust/pull/60318/
2530 [60364]: https://github.com/rust-lang/rust/pull/60364/
2531 [60370]: https://github.com/rust-lang/rust/pull/60370/
2532 [60404]: https://github.com/rust-lang/rust/pull/60404/
2533 [60234]: https://github.com/rust-lang/rust/pull/60234/
2534 [60244]: https://github.com/rust-lang/rust/pull/60244/
2535 [58623]: https://github.com/rust-lang/rust/pull/58623/
2536 [59648]: https://github.com/rust-lang/rust/pull/59648/
2537 [59675]: https://github.com/rust-lang/rust/pull/59675/
2538 [59825]: https://github.com/rust-lang/rust/pull/59825/
2539 [59826]: https://github.com/rust-lang/rust/pull/59826/
2540 [59445]: https://github.com/rust-lang/rust/pull/59445/
2541 [59114]: https://github.com/rust-lang/rust/pull/59114/
2542 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2543 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2544 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2545 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2546 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2547 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2548 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2549 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2550 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2551 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2552 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2553 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2554 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2555 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2556 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2557 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2558 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2559 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2560 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2561 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2564 Version 1.35.0 (2019-05-23)
2565 ==========================
2569 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2570 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2571 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2573 unsafe fn call_unsafe(func: unsafe fn()) {
2578 unsafe { call_unsafe(|| {}); }
2585 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2586 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2587 - [Added the `wasm32-unknown-wasi` target.][59464]
2592 - [`Thread` will now show its ID in `Debug` output.][59460]
2593 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2594 - [`alloc::System` now implements `Default`.][59451]
2595 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2597 - [`char::{ToLowercase, ToUppercase}` now
2598 implement `ExactSizeIterator`.][58778]
2599 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2600 - [Removed the `Read` trait bounds
2601 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2602 - [You can now call the `dbg!` macro without any parameters to print the file
2603 and line where it is called.][57847]
2604 - [In place ASCII case conversions are now up to 4× faster.][59283]
2605 e.g. `str::make_ascii_lowercase`
2606 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2613 - [`RefCell::replace_with`]
2614 - [`RefCell::map_split`]
2616 - [`Range::contains`]
2617 - [`RangeFrom::contains`]
2618 - [`RangeTo::contains`]
2619 - [`RangeInclusive::contains`]
2620 - [`RangeToInclusive::contains`]
2621 - [`Option::copied`]
2625 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2626 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2631 - [The Rust toolchain is now available natively for musl based distros.][58575]
2633 [59460]: https://github.com/rust-lang/rust/pull/59460/
2634 [59464]: https://github.com/rust-lang/rust/pull/59464/
2635 [59500]: https://github.com/rust-lang/rust/pull/59500/
2636 [59512]: https://github.com/rust-lang/rust/pull/59512/
2637 [59580]: https://github.com/rust-lang/rust/pull/59580/
2638 [59283]: https://github.com/rust-lang/rust/pull/59283/
2639 [59451]: https://github.com/rust-lang/rust/pull/59451/
2640 [59076]: https://github.com/rust-lang/rust/pull/59076/
2641 [58778]: https://github.com/rust-lang/rust/pull/58778/
2642 [58717]: https://github.com/rust-lang/rust/pull/58717/
2643 [58369]: https://github.com/rust-lang/rust/pull/58369/
2644 [58423]: https://github.com/rust-lang/rust/pull/58423/
2645 [58080]: https://github.com/rust-lang/rust/pull/58080/
2646 [57847]: https://github.com/rust-lang/rust/pull/57847/
2647 [58575]: https://github.com/rust-lang/rust/pull/58575
2648 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2649 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2650 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2651 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2652 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2653 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2654 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2655 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2656 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2657 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2658 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2659 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2661 Version 1.34.2 (2019-05-14)
2662 ===========================
2664 * [Destabilize the `Error::type_id` function due to a security
2665 vulnerability][60785] ([CVE-2019-12083])
2667 [60785]: https://github.com/rust-lang/rust/pull/60785
2668 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2670 Version 1.34.1 (2019-04-25)
2671 ===========================
2673 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2674 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2675 * [Fix Clippy panic when checking some macros][clippy/3805]
2677 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2678 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2679 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2681 Version 1.34.0 (2019-04-11)
2682 ==========================
2686 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2687 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2689 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2690 `#[attr{}]` procedural macros.][57367]
2691 - [You can now write `extern crate self as foo;`][57407] to import your
2692 crate's root into the extern prelude.
2697 - [You can now target `riscv64imac-unknown-none-elf` and
2698 `riscv64gc-unknown-none-elf`.][58406]
2699 - [You can now enable linker plugin LTO optimisations with
2700 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2701 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2703 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2708 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2709 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2710 the `Hash` trait to create an iterator.
2711 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2712 methods.][58421] Most notably you no longer require the `Ord` trait to create
2714 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2715 for all numeric types.][58044]
2716 - [Indexing a `str` is now generic over all types that
2717 implement `SliceIndex<str>`.][57604]
2718 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2719 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2720 produce a warning if their returning type is unused.
2721 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2722 `overflowing_pow` are now available for all numeric types.][57873] These are
2723 equivalent to methods such as `wrapping_add` for the `pow` operation.
2731 * [`Error::type_id`]
2732 * [`atomic::AtomicI16`]
2733 * [`atomic::AtomicI32`]
2734 * [`atomic::AtomicI64`]
2735 * [`atomic::AtomicI8`]
2736 * [`atomic::AtomicU16`]
2737 * [`atomic::AtomicU32`]
2738 * [`atomic::AtomicU64`]
2739 * [`atomic::AtomicU8`]
2740 * [`convert::Infallible`]
2741 * [`convert::TryFrom`]
2742 * [`convert::TryInto`]
2744 * [`iter::successors`]
2745 * [`num::NonZeroI128`]
2746 * [`num::NonZeroI16`]
2747 * [`num::NonZeroI32`]
2748 * [`num::NonZeroI64`]
2749 * [`num::NonZeroI8`]
2750 * [`num::NonZeroIsize`]
2751 * [`slice::sort_by_cached_key`]
2752 * [`str::escape_debug`]
2753 * [`str::escape_default`]
2754 * [`str::escape_unicode`]
2755 * [`str::split_ascii_whitespace`]
2758 * [`Instant::checked_add`]
2759 * [`Instant::checked_sub`]
2760 * [`SystemTime::checked_add`]
2761 * [`SystemTime::checked_sub`]
2765 - [You can now use alternative registries to crates.io.][cargo/6654]
2769 - [You can now use the `?` operator in your documentation tests without manually
2770 adding `fn main() -> Result<(), _> {}`.][56470]
2774 - [`Command::before_exec` is being replaced by the unsafe method
2775 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2776 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2777 can now use `const` functions in `static` variables.
2779 [58370]: https://github.com/rust-lang/rust/pull/58370/
2780 [58406]: https://github.com/rust-lang/rust/pull/58406/
2781 [58421]: https://github.com/rust-lang/rust/pull/58421/
2782 [58166]: https://github.com/rust-lang/rust/pull/58166/
2783 [58044]: https://github.com/rust-lang/rust/pull/58044/
2784 [58057]: https://github.com/rust-lang/rust/pull/58057/
2785 [58059]: https://github.com/rust-lang/rust/pull/58059/
2786 [57809]: https://github.com/rust-lang/rust/pull/57809/
2787 [57873]: https://github.com/rust-lang/rust/pull/57873/
2788 [57604]: https://github.com/rust-lang/rust/pull/57604/
2789 [57367]: https://github.com/rust-lang/rust/pull/57367/
2790 [57407]: https://github.com/rust-lang/rust/pull/57407/
2791 [57425]: https://github.com/rust-lang/rust/pull/57425/
2792 [57106]: https://github.com/rust-lang/rust/pull/57106/
2793 [56470]: https://github.com/rust-lang/rust/pull/56470/
2794 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2795 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2796 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2797 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2798 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2799 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2800 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2801 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2802 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2803 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2804 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2805 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2806 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2807 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2808 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2809 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2810 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2811 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2812 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2813 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2814 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2815 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2816 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2817 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2818 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2819 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2820 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2821 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2822 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2823 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2824 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2827 Version 1.33.0 (2019-02-28)
2828 ==========================
2832 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2833 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2834 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2835 E.g. You can have match statement on a `u8` that covers `0..=255` and
2836 you would no longer be required to have a `_ => unreachable!()` case.
2837 - [You can now have multiple patterns in `if let` and `while let`
2838 expressions.][57532] You can do this with the same syntax as a `match`
2848 let state = Creature::Crab("Ferris");
2850 if let Creature::Crab(name) | Creature::Person(name) = state {
2851 println!("This creature's name is: {}", name);
2855 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2856 this feature will by default produce a warning as this behaviour can be
2857 unintuitive. E.g. `if let _ = 5 {}`
2858 - [You can now use `let` bindings, assignments, expression statements,
2859 and irrefutable pattern destructuring in const functions.][57175]
2860 - [You can now call unsafe const functions.][57067] E.g.
2862 const unsafe fn foo() -> i32 { 5 }
2863 const fn bar() -> i32 {
2867 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2868 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2869 - [You can now specify a specific alignment with the `#[repr(packed)]`
2870 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2871 with an alignment of 2 bytes and a size of 6 bytes.
2872 - [You can now import an item from a module as an `_`.][56303] This allows you to
2873 import a trait's impls, and not have the name in the namespace. E.g.
2875 use std::io::Read as _;
2877 // Allowed as there is only one `Read` in the module.
2880 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2884 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2885 command line argument.][56351]
2886 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2887 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2888 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2889 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2890 information on Rust's platform support.
2891 - [Added support for the `thumbv7neon-linux-androideabi` and
2892 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2893 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2897 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2898 functions for all numeric types.][57566]
2899 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2900 are now `const` functions for all numeric types.][57105]
2901 - [The methods `is_positive` and `is_negative` are now `const` functions for
2902 all signed numeric types.][57105]
2903 - [The `get` method for all `NonZero` types is now `const`.][57167]
2904 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2905 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2906 numeric types.][57234]
2907 - [`Ipv4Addr::new` is now a `const` function][57234]
2911 - [`unix::FileExt::read_exact_at`]
2912 - [`unix::FileExt::write_all_at`]
2913 - [`Option::transpose`]
2914 - [`Result::transpose`]
2915 - [`convert::identity`]
2918 - [`marker::PhantomPinned`]
2919 - [`Vec::resize_with`]
2920 - [`VecDeque::resize_with`]
2921 - [`Duration::as_millis`]
2922 - [`Duration::as_micros`]
2923 - [`Duration::as_nanos`]
2928 - [You can now publish crates that require a feature flag to compile with
2929 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2930 - [Cargo should now rebuild a crate if a file was modified during the initial
2935 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2936 are now deprecated in the standard library, and their usage will now produce a warning.
2937 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2939 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2941 - [Libtest no longer creates a new thread for each test when
2942 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2944 [55982]: https://github.com/rust-lang/rust/pull/55982/
2945 [56243]: https://github.com/rust-lang/rust/pull/56243
2946 [56303]: https://github.com/rust-lang/rust/pull/56303/
2947 [56351]: https://github.com/rust-lang/rust/pull/56351/
2948 [56362]: https://github.com/rust-lang/rust/pull/56362
2949 [56642]: https://github.com/rust-lang/rust/pull/56642/
2950 [56769]: https://github.com/rust-lang/rust/pull/56769/
2951 [56805]: https://github.com/rust-lang/rust/pull/56805
2952 [56947]: https://github.com/rust-lang/rust/pull/56947/
2953 [57049]: https://github.com/rust-lang/rust/pull/57049/
2954 [57067]: https://github.com/rust-lang/rust/pull/57067/
2955 [57105]: https://github.com/rust-lang/rust/pull/57105
2956 [57130]: https://github.com/rust-lang/rust/pull/57130/
2957 [57167]: https://github.com/rust-lang/rust/pull/57167/
2958 [57175]: https://github.com/rust-lang/rust/pull/57175/
2959 [57234]: https://github.com/rust-lang/rust/pull/57234/
2960 [57332]: https://github.com/rust-lang/rust/pull/57332/
2961 [57465]: https://github.com/rust-lang/rust/pull/57465/
2962 [57532]: https://github.com/rust-lang/rust/pull/57532/
2963 [57535]: https://github.com/rust-lang/rust/pull/57535/
2964 [57566]: https://github.com/rust-lang/rust/pull/57566/
2965 [57615]: https://github.com/rust-lang/rust/pull/57615/
2966 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2967 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2968 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2969 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2970 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2971 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2972 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2973 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2974 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2975 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2976 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2977 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2978 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2979 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2980 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2981 [platform-support]: https://forge.rust-lang.org/platform-support.html
2983 Version 1.32.0 (2019-01-17)
2984 ==========================
2989 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2990 operator allows you to specify zero or one repetitions similar to the `*` and
2992 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2993 now always resolve to the item (`enum`, `struct`, etc.) available in the
2994 module if present, before resolving to a external crate or an item the prelude.][56759]
2997 enum Color { Red, Green, Blue }
3003 - [You can now match against `PhantomData<T>` types.][55837]
3004 - [You can now match against literals in macros with the `literal`
3005 specifier.][56072] This will match against a literal of any type.
3006 E.g. `1`, `'A'`, `"Hello World"`
3007 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3009 struct Point(i32, i32);
3012 pub fn new(x: i32, y: i32) -> Self {
3016 pub fn is_origin(&self) -> bool {
3024 - [Self can also now be used in type definitions.][56366] E.g.
3028 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3031 Cons(T, Box<Self>) // likewise here
3034 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3035 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3039 - [The default allocator has changed from jemalloc to the default allocator on
3040 your system.][55238] The compiler itself on Linux & macOS will still use
3041 jemalloc, but programs compiled with it will use the system allocator.
3042 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3046 - [`PathBuf` now implements `FromStr`.][55148]
3047 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3048 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3049 easily debug expressions in your rust program. E.g.
3052 let b = dbg!(a * 2) + 1;
3053 // ^-- prints: [src/main.rs:4] a * 2 = 4
3057 The following APIs are now `const` functions and can be used in a
3061 - [`UnsafeCell::get`]
3062 - [`char::is_ascii`]
3064 - [`ManuallyDrop::new`]
3065 - [`ManuallyDrop::into_inner`]
3066 - [`RangeInclusive::start`]
3067 - [`RangeInclusive::end`]
3068 - [`NonNull::as_ptr`]
3071 - [`Duration::as_secs`]
3072 - [`Duration::subsec_millis`]
3073 - [`Duration::subsec_micros`]
3074 - [`Duration::subsec_nanos`]
3076 - [`Ipv4Addr::is_unspecified`]
3078 - [`Ipv6Addr::octets`]
3082 - [`i8::to_be_bytes`]
3083 - [`i8::to_le_bytes`]
3084 - [`i8::to_ne_bytes`]
3085 - [`i8::from_be_bytes`]
3086 - [`i8::from_le_bytes`]
3087 - [`i8::from_ne_bytes`]
3088 - [`i16::to_be_bytes`]
3089 - [`i16::to_le_bytes`]
3090 - [`i16::to_ne_bytes`]
3091 - [`i16::from_be_bytes`]
3092 - [`i16::from_le_bytes`]
3093 - [`i16::from_ne_bytes`]
3094 - [`i32::to_be_bytes`]
3095 - [`i32::to_le_bytes`]
3096 - [`i32::to_ne_bytes`]
3097 - [`i32::from_be_bytes`]
3098 - [`i32::from_le_bytes`]
3099 - [`i32::from_ne_bytes`]
3100 - [`i64::to_be_bytes`]
3101 - [`i64::to_le_bytes`]
3102 - [`i64::to_ne_bytes`]
3103 - [`i64::from_be_bytes`]
3104 - [`i64::from_le_bytes`]
3105 - [`i64::from_ne_bytes`]
3106 - [`i128::to_be_bytes`]
3107 - [`i128::to_le_bytes`]
3108 - [`i128::to_ne_bytes`]
3109 - [`i128::from_be_bytes`]
3110 - [`i128::from_le_bytes`]
3111 - [`i128::from_ne_bytes`]
3112 - [`isize::to_be_bytes`]
3113 - [`isize::to_le_bytes`]
3114 - [`isize::to_ne_bytes`]
3115 - [`isize::from_be_bytes`]
3116 - [`isize::from_le_bytes`]
3117 - [`isize::from_ne_bytes`]
3118 - [`u8::to_be_bytes`]
3119 - [`u8::to_le_bytes`]
3120 - [`u8::to_ne_bytes`]
3121 - [`u8::from_be_bytes`]
3122 - [`u8::from_le_bytes`]
3123 - [`u8::from_ne_bytes`]
3124 - [`u16::to_be_bytes`]
3125 - [`u16::to_le_bytes`]
3126 - [`u16::to_ne_bytes`]
3127 - [`u16::from_be_bytes`]
3128 - [`u16::from_le_bytes`]
3129 - [`u16::from_ne_bytes`]
3130 - [`u32::to_be_bytes`]
3131 - [`u32::to_le_bytes`]
3132 - [`u32::to_ne_bytes`]
3133 - [`u32::from_be_bytes`]
3134 - [`u32::from_le_bytes`]
3135 - [`u32::from_ne_bytes`]
3136 - [`u64::to_be_bytes`]
3137 - [`u64::to_le_bytes`]
3138 - [`u64::to_ne_bytes`]
3139 - [`u64::from_be_bytes`]
3140 - [`u64::from_le_bytes`]
3141 - [`u64::from_ne_bytes`]
3142 - [`u128::to_be_bytes`]
3143 - [`u128::to_le_bytes`]
3144 - [`u128::to_ne_bytes`]
3145 - [`u128::from_be_bytes`]
3146 - [`u128::from_le_bytes`]
3147 - [`u128::from_ne_bytes`]
3148 - [`usize::to_be_bytes`]
3149 - [`usize::to_le_bytes`]
3150 - [`usize::to_ne_bytes`]
3151 - [`usize::from_be_bytes`]
3152 - [`usize::from_le_bytes`]
3153 - [`usize::from_ne_bytes`]
3157 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3158 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3162 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3166 - [The argument types for AVX's
3167 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3168 been changed from `*const` to `*mut` as the previous implementation
3172 [55148]: https://github.com/rust-lang/rust/pull/55148/
3173 [55238]: https://github.com/rust-lang/rust/pull/55238/
3174 [55280]: https://github.com/rust-lang/rust/pull/55280/
3175 [55610]: https://github.com/rust-lang/rust/pull/55610/
3176 [55663]: https://github.com/rust-lang/rust/pull/55663/
3177 [55702]: https://github.com/rust-lang/rust/pull/55702/
3178 [55837]: https://github.com/rust-lang/rust/pull/55837/
3179 [55843]: https://github.com/rust-lang/rust/pull/55843/
3180 [56072]: https://github.com/rust-lang/rust/pull/56072/
3181 [56245]: https://github.com/rust-lang/rust/pull/56245/
3182 [56365]: https://github.com/rust-lang/rust/pull/56365/
3183 [56366]: https://github.com/rust-lang/rust/pull/56366/
3184 [56395]: https://github.com/rust-lang/rust/pull/56395/
3185 [56759]: https://github.com/rust-lang/rust/pull/56759/
3186 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3187 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3188 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3189 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3190 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3191 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3192 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3193 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3194 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3195 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3196 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3197 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3198 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3199 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3200 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3201 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3202 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3203 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3204 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3205 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3206 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3207 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3208 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3209 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3210 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3211 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3212 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3213 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3214 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3215 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3216 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3217 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3218 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3219 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3220 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3221 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3222 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3223 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3224 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3225 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3226 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3227 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3228 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3229 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3230 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3231 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3232 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3233 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3234 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3235 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3236 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3237 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3238 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3239 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3240 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3241 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3242 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3243 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3244 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3245 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3246 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3247 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3248 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3249 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3250 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3251 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3252 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3253 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3254 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3255 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3256 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3257 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3258 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3259 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3260 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3261 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3262 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3263 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3264 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3265 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3266 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3267 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3268 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3269 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3270 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3271 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3272 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3273 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3274 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3275 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3276 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3277 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3278 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3281 Version 1.31.1 (2018-12-20)
3282 ===========================
3284 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3285 - [Fix broken go-to-definition in RLS][rls/1171]
3286 - [Fix infinite loop on hover in RLS][rls/1170]
3288 [56562]: https://github.com/rust-lang/rust/pull/56562
3289 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3290 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3292 Version 1.31.0 (2018-12-06)
3293 ==========================
3297 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3298 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3299 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3300 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3302 - [You can now define and use `const` functions.][54835] These are currently
3303 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3304 [language reference][const-reference] for what exactly is available.
3305 - [You can now use tool lints, which allow you to scope lints from external
3306 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3307 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3308 a crate, not just in exported functions.][54451]
3309 - [You can now use parentheses in pattern matches.][54497]
3313 - [Updated musl to 1.1.20][54430]
3317 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3318 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3319 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3320 into `Option<&mut T>` using the `From` trait.][53218]
3321 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3326 - [`slice::align_to`]
3327 - [`slice::align_to_mut`]
3328 - [`slice::chunks_exact`]
3329 - [`slice::chunks_exact_mut`]
3330 - [`slice::rchunks`]
3331 - [`slice::rchunks_mut`]
3332 - [`slice::rchunks_exact`]
3333 - [`slice::rchunks_exact_mut`]
3334 - [`Option::replace`]
3338 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3339 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3340 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3342 [52813]: https://github.com/rust-lang/rust/pull/52813/
3343 [53218]: https://github.com/rust-lang/rust/pull/53218/
3344 [53555]: https://github.com/rust-lang/rust/issues/53555/
3345 [54057]: https://github.com/rust-lang/rust/pull/54057/
3346 [54240]: https://github.com/rust-lang/rust/pull/54240/
3347 [54430]: https://github.com/rust-lang/rust/pull/54430/
3348 [54451]: https://github.com/rust-lang/rust/pull/54451/
3349 [54497]: https://github.com/rust-lang/rust/pull/54497/
3350 [54778]: https://github.com/rust-lang/rust/pull/54778/
3351 [54835]: https://github.com/rust-lang/rust/pull/54835/
3352 [54870]: https://github.com/rust-lang/rust/pull/54870/
3353 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3354 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3355 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3356 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3357 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3358 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3359 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3360 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3361 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3362 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3363 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3364 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3365 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3366 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3368 Version 1.30.1 (2018-11-08)
3369 ===========================
3371 - [Fixed overflow ICE in rustdoc][54199]
3372 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3374 [54199]: https://github.com/rust-lang/rust/pull/54199
3375 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3377 Version 1.30.0 (2018-10-25)
3378 ==========================
3382 - [Procedural macros are now available.][52081] These kinds of macros allow for
3383 more powerful code generation. There is a [new chapter available][proc-macros]
3384 in the Rust Programming Language book that goes further in depth.
3385 - [You can now use keywords as identifiers using the raw identifiers
3386 syntax (`r#`),][53236] e.g. `let r#for = true;`
3387 - [Using anonymous parameters in traits is now deprecated with a warning and
3388 will be a hard error in the 2018 edition.][53272]
3389 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3390 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3391 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3392 Previously, using a external crate in a module without a use statement
3393 required `let json = ::serde_json::from_str(foo);` but can now be written
3394 as `let json = serde_json::from_str(foo);`.
3395 - [You can now apply the `#[used]` attribute to static items to prevent the
3396 compiler from optimising them away, even if they appear to be unused,][51363]
3397 e.g. `#[used] static FOO: u32 = 1;`
3398 - [You can now import and reexport macros from other crates with the `use`
3399 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3400 the root module of the crate. If your macro relies on calling other local
3401 macros, it is recommended to export with the
3402 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3404 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3405 using the `vis` specifier.][53370]
3406 - [Non-macro attributes now allow all forms of literals, not just
3407 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3408 write `#[attr(true)]`.
3409 - [You can now specify a function to handle a panic in the Rust runtime with the
3410 `#[panic_handler]` attribute.][51366]
3414 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3415 - [Added the `aarch64-unknown-netbsd` target][53165]
3416 - [Upgraded to LLVM 8.][53611]
3420 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3424 - [`Ipv4Addr::BROADCAST`]
3425 - [`Ipv4Addr::LOCALHOST`]
3426 - [`Ipv4Addr::UNSPECIFIED`]
3427 - [`Ipv6Addr::LOCALHOST`]
3428 - [`Ipv6Addr::UNSPECIFIED`]
3429 - [`Iterator::find_map`]
3431 The following methods are replacement methods for `trim_left`, `trim_right`,
3432 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3434 - [`str::trim_end_matches`]
3436 - [`str::trim_start_matches`]
3437 - [`str::trim_start`]
3441 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3442 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3443 equivalent to calling `rustdoc --error-format=json`.
3444 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3448 - [`rustdoc` allows you to specify what edition to treat your code as with the
3449 `--edition` option.][54057]
3450 - [`rustdoc` now has the `--color` (specify whether to output color) and
3451 `--error-format` (specify error format, e.g. `json`) options.][53003]
3452 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3453 debug symbols.][53774]
3454 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3455 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3457 [50911]: https://github.com/rust-lang/rust/pull/50911/
3458 [51363]: https://github.com/rust-lang/rust/pull/51363/
3459 [51366]: https://github.com/rust-lang/rust/pull/51366/
3460 [52081]: https://github.com/rust-lang/rust/pull/52081/
3461 [53003]: https://github.com/rust-lang/rust/pull/53003/
3462 [53033]: https://github.com/rust-lang/rust/pull/53033/
3463 [53044]: https://github.com/rust-lang/rust/pull/53044/
3464 [53165]: https://github.com/rust-lang/rust/pull/53165/
3465 [53611]: https://github.com/rust-lang/rust/pull/53611/
3466 [53213]: https://github.com/rust-lang/rust/pull/53213/
3467 [53236]: https://github.com/rust-lang/rust/pull/53236/
3468 [53272]: https://github.com/rust-lang/rust/pull/53272/
3469 [53370]: https://github.com/rust-lang/rust/pull/53370/
3470 [53459]: https://github.com/rust-lang/rust/pull/53459/
3471 [53774]: https://github.com/rust-lang/rust/pull/53774/
3472 [53822]: https://github.com/rust-lang/rust/pull/53822/
3473 [54057]: https://github.com/rust-lang/rust/pull/54057/
3474 [54146]: https://github.com/rust-lang/rust/pull/54146/
3475 [54404]: https://github.com/rust-lang/rust/pull/54404/
3476 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3477 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3478 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3479 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3481 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3482 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3483 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3484 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3485 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3486 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3487 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3488 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3489 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3490 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3493 Version 1.29.2 (2018-10-11)
3494 ===========================
3496 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3497 - The `rls-preview` component on the windows-gnu targets has been restored.
3499 [54639]: https://github.com/rust-lang/rust/pull/54639
3502 Version 1.29.1 (2018-09-25)
3503 ===========================
3508 - The standard library's `str::repeat` function contained an out of bounds write
3509 caused by an integer overflow. This has been fixed by deterministically
3510 panicking when an overflow happens.
3512 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3516 Version 1.29.0 (2018-09-13)
3517 ==========================
3521 - [Bumped minimum LLVM version to 5.0.][51899]
3522 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3523 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3524 - [Upgraded to LLVM 7.][51966]
3528 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3529 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3530 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3531 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3533 - [`Cell<T>` now allows `T` to be unsized.][50494]
3534 - [`SocketAddr` is now stable on Redox.][52656]
3539 - [`Iterator::flatten`]
3544 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3545 `--locked` to disable this behavior.
3546 - [`cargo-install` will now allow you to cross compile an install
3547 using `--target`.][cargo/5614]
3548 - [Added the `cargo-fix` subcommand to automatically move project code from
3549 2015 edition to 2018.][cargo/5723]
3550 - [`cargo doc` can now optionally document private types using the
3551 `--document-private-items` flag.][cargo/5543]
3555 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3556 the specified level to that level.][52354] For example `--cap-lints warn`
3557 will demote `deny` and `forbid` lints to `warn`.
3558 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3559 fails and `101` if there is a panic.][52197]
3560 - [A preview of clippy has been made available through rustup.][51122]
3561 You can install the preview with `rustup component add clippy-preview`.
3565 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3566 Use `str::get_unchecked(begin..end)` instead.
3567 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3568 Consider using the `home_dir` function from
3569 https://crates.io/crates/dirs instead.
3570 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3571 - [`cfg` attributes and `--cfg` command line flags are now more
3572 strictly validated.][53893]
3574 [53893]: https://github.com/rust-lang/rust/pull/53893/
3575 [52861]: https://github.com/rust-lang/rust/pull/52861/
3576 [51966]: https://github.com/rust-lang/rust/pull/51966/
3577 [52656]: https://github.com/rust-lang/rust/pull/52656/
3578 [52239]: https://github.com/rust-lang/rust/pull/52239/
3579 [52330]: https://github.com/rust-lang/rust/pull/52330/
3580 [52354]: https://github.com/rust-lang/rust/pull/52354/
3581 [52402]: https://github.com/rust-lang/rust/pull/52402/
3582 [52103]: https://github.com/rust-lang/rust/pull/52103/
3583 [52197]: https://github.com/rust-lang/rust/pull/52197/
3584 [51807]: https://github.com/rust-lang/rust/pull/51807/
3585 [51899]: https://github.com/rust-lang/rust/pull/51899/
3586 [51912]: https://github.com/rust-lang/rust/pull/51912/
3587 [51511]: https://github.com/rust-lang/rust/pull/51511/
3588 [51619]: https://github.com/rust-lang/rust/pull/51619/
3589 [51656]: https://github.com/rust-lang/rust/pull/51656/
3590 [51178]: https://github.com/rust-lang/rust/pull/51178/
3591 [51122]: https://github.com/rust-lang/rust/pull/51122
3592 [50494]: https://github.com/rust-lang/rust/pull/50494/
3593 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3594 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3595 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3596 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3597 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3598 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3599 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3602 Version 1.28.0 (2018-08-02)
3603 ===========================
3607 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3608 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3609 the inner type across Foreign Function Interface (FFI) boundaries.
3610 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3611 and can now be used as identifiers.][51196]
3612 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3613 stable.][51241] This will allow users to specify a global allocator for
3615 - [Unit test functions marked with the `#[test]` attribute can now return
3616 `Result<(), E: Debug>` in addition to `()`.][51298]
3617 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3618 allows macros to easily target lifetimes.
3622 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3623 prioritise making smaller binary sizes. `z` is the same as `s` with the
3624 exception that it does not vectorise loops, which typically results in an even
3626 - [The short error format is now stable.][49546] Specified with
3627 `--error-format=short` this option will provide a more compressed output of
3628 rust error messages.
3629 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3630 - [Reduced the number of allocations in the macro parser.][50855] This can
3631 improve compile times of macro heavy crates on average by 5%.
3635 - [Implemented `Default` for `&mut str`.][51306]
3636 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3637 - [Implemented `Extend` for `()`.][50234]
3638 - [The `Debug` implementation of `time::Duration` should now be more easily
3639 human readable.][50364] Previously a `Duration` of one second would printed as
3640 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3641 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3642 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3643 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3644 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3645 for `PathBuf`.][50170]
3646 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3647 and `Wrapping<i128>`.][50465]
3648 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3649 possible.][51050] This can provide up to a 40% speed increase.
3650 - [Improved error messages when using `format!`.][50610]
3654 - [`Iterator::step_by`]
3655 - [`Path::ancestors`]
3656 - [`SystemTime::UNIX_EPOCH`]
3657 - [`alloc::GlobalAlloc`]
3659 - [`alloc::LayoutErr`]
3662 - [`alloc::alloc_zeroed`]
3663 - [`alloc::dealloc`]
3664 - [`alloc::realloc`]
3665 - [`alloc::handle_alloc_error`]
3666 - [`btree_map::Entry::or_default`]
3667 - [`fmt::Alignment`]
3668 - [`hash_map::Entry::or_default`]
3669 - [`iter::repeat_with`]
3670 - [`num::NonZeroUsize`]
3671 - [`num::NonZeroU128`]
3672 - [`num::NonZeroU16`]
3673 - [`num::NonZeroU32`]
3674 - [`num::NonZeroU64`]
3675 - [`num::NonZeroU8`]
3676 - [`ops::RangeBounds`]
3677 - [`slice::SliceIndex`]
3678 - [`slice::from_mut`]
3679 - [`slice::from_ref`]
3680 - [`{Any + Send + Sync}::downcast_mut`]
3681 - [`{Any + Send + Sync}::downcast_ref`]
3682 - [`{Any + Send + Sync}::is`]
3686 - [Cargo will now no longer allow you to publish crates with build scripts that
3687 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3688 considered to be immutable.
3692 - [The `suggestion_applicability` field in `rustc`'s json output is now
3693 stable.][50486] This will allow dev tools to check whether a code suggestion
3694 would apply to them.
3698 - [Rust will consider trait objects with duplicated constraints to be the same
3699 type as without the duplicated constraint.][51276] For example the below code will
3700 now fail to compile.
3705 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3708 impl Trait + Send + Send {
3709 fn test(&self) { println!("two"); }
3713 [49546]: https://github.com/rust-lang/rust/pull/49546/
3714 [50143]: https://github.com/rust-lang/rust/pull/50143/
3715 [50170]: https://github.com/rust-lang/rust/pull/50170/
3716 [50234]: https://github.com/rust-lang/rust/pull/50234/
3717 [50265]: https://github.com/rust-lang/rust/pull/50265/
3718 [50364]: https://github.com/rust-lang/rust/pull/50364/
3719 [50385]: https://github.com/rust-lang/rust/pull/50385/
3720 [50465]: https://github.com/rust-lang/rust/pull/50465/
3721 [50486]: https://github.com/rust-lang/rust/pull/50486/
3722 [50554]: https://github.com/rust-lang/rust/pull/50554/
3723 [50610]: https://github.com/rust-lang/rust/pull/50610/
3724 [50855]: https://github.com/rust-lang/rust/pull/50855/
3725 [51050]: https://github.com/rust-lang/rust/pull/51050/
3726 [51196]: https://github.com/rust-lang/rust/pull/51196/
3727 [51200]: https://github.com/rust-lang/rust/pull/51200/
3728 [51241]: https://github.com/rust-lang/rust/pull/51241/
3729 [51276]: https://github.com/rust-lang/rust/pull/51276/
3730 [51298]: https://github.com/rust-lang/rust/pull/51298/
3731 [51306]: https://github.com/rust-lang/rust/pull/51306/
3732 [51562]: https://github.com/rust-lang/rust/pull/51562/
3733 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3734 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3735 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3736 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3737 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3738 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3739 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3740 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3741 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3742 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3743 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3744 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3745 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3746 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3747 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3748 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3749 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3750 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3751 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3752 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3753 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3754 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3755 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3756 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3757 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3758 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3759 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3760 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3761 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3762 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3764 Version 1.27.2 (2018-07-20)
3765 ===========================
3770 - The borrow checker was fixed to avoid potential unsoundness when using
3771 match ergonomics: [#52213][52213].
3773 [52213]: https://github.com/rust-lang/rust/issues/52213
3775 Version 1.27.1 (2018-07-10)
3776 ===========================
3781 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3782 when running, which enabled executing code as some other user on a
3783 given machine. This release fixes that vulnerability; you can read
3784 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3786 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3791 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3792 match ergonomics: [#51415][51415], [#49534][49534].
3794 [51415]: https://github.com/rust-lang/rust/issues/51415
3795 [49534]: https://github.com/rust-lang/rust/issues/49534
3796 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3797 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3799 Version 1.27.0 (2018-06-21)
3800 ==========================
3804 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3805 be used as an identifier.
3806 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3807 bare `Trait` syntax, and should make it clearer when being used in tandem with
3808 `impl Trait` because it is equivalent to the following syntax:
3809 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3810 `Box<Trait> == Box<dyn Trait>`.
3811 - [Attributes on generic parameters such as types and lifetimes are
3812 now stable.][48851] e.g.
3813 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3814 - [The `#[must_use]` attribute can now also be used on functions as well as
3815 types.][48925] It provides a lint that by default warns users when the
3816 value returned by a function has not been used.
3820 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3824 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3825 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3826 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3827 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3828 the `cfg` attribute.
3829 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3830 std are now available in core.][49896]
3831 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3833 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3834 that the operation isn't done in place.
3835 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3836 the `#[must_use]` attribute][49533] to warn about unused potentially
3837 expensive allocations.
3841 - [`DoubleEndedIterator::rfind`]
3842 - [`DoubleEndedIterator::rfold`]
3843 - [`DoubleEndedIterator::try_rfold`]
3844 - [`Duration::from_micros`]
3845 - [`Duration::from_nanos`]
3846 - [`Duration::subsec_micros`]
3847 - [`Duration::subsec_millis`]
3848 - [`HashMap::remove_entry`]
3849 - [`Iterator::try_fold`]
3850 - [`Iterator::try_for_each`]
3852 - [`Option::filter`]
3853 - [`String::replace_range`]
3854 - [`Take::set_limit`]
3855 - [`hint::unreachable_unchecked`]
3856 - [`os::unix::process::parent_id`]
3857 - [`ptr::swap_nonoverlapping`]
3858 - [`slice::rsplit_mut`]
3860 - [`slice::swap_with_slice`]
3864 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3865 `readme`, and `repository` fields.][cargo/5386]
3866 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3867 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3868 a different directory than `target` for placing compilation artifacts.
3869 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3870 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3871 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3872 where cargo would infer a binary, Cargo will produce a warning. You can
3873 disable this feature ahead of time by setting any of the following to false:
3874 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3875 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3876 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3880 - [Added “The Rustc book” into the official documentation.][49707]
3881 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3882 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3886 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3887 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3888 compile, `"".is_empty()` will still compile.
3889 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3890 will only print the inner type.][48553] E.g.
3891 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3892 not `AtomicBool(true)`.
3893 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3894 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3895 alignment should cover all use cases.
3896 - The `.description()` method on the `std::error::Error` trait
3897 [has been soft-deprecated][50163]. It is no longer required to implement it.
3899 [48553]: https://github.com/rust-lang/rust/pull/48553/
3900 [48851]: https://github.com/rust-lang/rust/pull/48851/
3901 [48925]: https://github.com/rust-lang/rust/pull/48925/
3902 [49533]: https://github.com/rust-lang/rust/pull/49533/
3903 [49623]: https://github.com/rust-lang/rust/pull/49623/
3904 [49630]: https://github.com/rust-lang/rust/pull/49630/
3905 [49664]: https://github.com/rust-lang/rust/pull/49664/
3906 [49699]: https://github.com/rust-lang/rust/pull/49699/
3907 [49707]: https://github.com/rust-lang/rust/pull/49707/
3908 [49719]: https://github.com/rust-lang/rust/pull/49719/
3909 [49896]: https://github.com/rust-lang/rust/pull/49896/
3910 [49968]: https://github.com/rust-lang/rust/pull/49968/
3911 [50163]: https://github.com/rust-lang/rust/pull/50163
3912 [50177]: https://github.com/rust-lang/rust/pull/50177/
3913 [50378]: https://github.com/rust-lang/rust/pull/50378/
3914 [50398]: https://github.com/rust-lang/rust/pull/50398/
3915 [50423]: https://github.com/rust-lang/rust/pull/50423/
3916 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3917 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3918 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3919 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3920 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3921 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3922 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3923 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3924 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3925 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3926 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3927 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3928 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3929 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3930 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3931 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3932 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3933 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3934 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3935 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3936 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3937 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3938 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3939 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3940 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3941 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3942 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3943 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3944 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3945 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3948 Version 1.26.2 (2018-06-05)
3949 ==========================
3954 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3956 [51117]: https://github.com/rust-lang/rust/issues/51117
3959 Version 1.26.1 (2018-05-29)
3960 ==========================
3965 - [RLS now works on Windows.][50646]
3966 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3972 - [`fn main() -> impl Trait` no longer works for non-Termination
3974 This reverts an accidental stabilization.
3975 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3976 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3978 [50646]: https://github.com/rust-lang/rust/issues/50646
3979 [50656]: https://github.com/rust-lang/rust/pull/50656
3980 [50812]: https://github.com/rust-lang/rust/pull/50812
3981 [50950]: https://github.com/rust-lang/rust/issues/50950
3982 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3984 Version 1.26.0 (2018-05-10)
3985 ==========================
3989 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3990 implement either or both traits.][49299]
3991 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3992 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3993 lifetime can be elided.][49458]
3994 - [`impl Trait` is now stable allowing you to have abstract types in returns
3995 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3996 `fn open(path: impl AsRef<Path>)`.
3997 - [Pattern matching will now automatically apply dereferences.][49394]
3998 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3999 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4000 - [A lot of operations are now available in a const context.][46882] E.g. You
4001 can now index into constant arrays, reference and dereference into constants,
4002 and use tuple struct constructors.
4003 - [Fixed entry slice patterns are now stable.][48516] E.g.
4005 let points = [1, 2, 3, 4];
4007 [1, 2, 3, 4] => println!("All points were sequential."),
4008 _ => println!("Not all points were sequential."),
4015 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4016 - [Fixed exponential projection complexity on nested types.][48296]
4017 This can provide up to a ~12% reduction in compile times for certain crates.
4018 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4019 to remap path prefixes outputted by the compiler.
4020 - [Added `powerpc-unknown-netbsd` target.][48281]
4024 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4025 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4026 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4027 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4028 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4029 - [`ascii::escape_default` is now available in libcore.][48735]
4030 - [Trailing commas are now supported in std and core macros.][48056]
4031 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4032 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4037 - [`*const T::copy_to_nonoverlapping`]
4038 - [`*const T::copy_to`]
4039 - [`*const T::read_unaligned`]
4040 - [`*const T::read_volatile`]
4041 - [`*const T::read`]
4043 - [`*const T::wrapping_add`]
4044 - [`*const T::wrapping_sub`]
4046 - [`*mut T::copy_to_nonoverlapping`]
4047 - [`*mut T::copy_to`]
4048 - [`*mut T::read_unaligned`]
4049 - [`*mut T::read_volatile`]
4051 - [`*mut T::replace`]
4054 - [`*mut T::wrapping_add`]
4055 - [`*mut T::wrapping_sub`]
4056 - [`*mut T::write_bytes`]
4057 - [`*mut T::write_unaligned`]
4058 - [`*mut T::write_volatile`]
4061 - [`FromUtf8Error::as_bytes`]
4062 - [`LocalKey::try_with`]
4063 - [`Option::cloned`]
4064 - [`btree_map::Entry::and_modify`]
4065 - [`fs::read_to_string`]
4068 - [`hash_map::Entry::and_modify`]
4069 - [`iter::FusedIterator`]
4070 - [`ops::RangeInclusive`]
4071 - [`ops::RangeToInclusive`]
4073 - [`slice::rotate_left`]
4074 - [`slice::rotate_right`]
4075 - [`String::retain`]
4080 - [Cargo will now output path to custom commands when `-v` is
4081 passed with `--list`][cargo/5041]
4082 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4086 - [The second edition of "The Rust Programming Language" book is now recommended
4087 over the first.][48404]
4092 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4093 syntax is now invalid.
4095 use std::ops::Fn as dyn;
4096 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4098 - [The result of dereferences are no longer promoted to `'static`.][47408]
4102 const PAIR: &(i32, i32) = &(0, 1);
4103 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4106 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4107 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4109 - [Removed hoedown from rustdoc.][48274]
4110 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4112 [46882]: https://github.com/rust-lang/rust/pull/46882
4113 [47379]: https://github.com/rust-lang/rust/pull/47379
4114 [47408]: https://github.com/rust-lang/rust/pull/47408
4115 [47813]: https://github.com/rust-lang/rust/pull/47813
4116 [48056]: https://github.com/rust-lang/rust/pull/48056
4117 [48125]: https://github.com/rust-lang/rust/pull/48125
4118 [48166]: https://github.com/rust-lang/rust/pull/48166
4119 [48235]: https://github.com/rust-lang/rust/pull/48235
4120 [48274]: https://github.com/rust-lang/rust/pull/48274
4121 [48281]: https://github.com/rust-lang/rust/pull/48281
4122 [48296]: https://github.com/rust-lang/rust/pull/48296
4123 [48326]: https://github.com/rust-lang/rust/pull/48326
4124 [48359]: https://github.com/rust-lang/rust/pull/48359
4125 [48404]: https://github.com/rust-lang/rust/pull/48404
4126 [48481]: https://github.com/rust-lang/rust/pull/48481
4127 [48516]: https://github.com/rust-lang/rust/pull/48516
4128 [48628]: https://github.com/rust-lang/rust/pull/48628
4129 [48629]: https://github.com/rust-lang/rust/pull/48629
4130 [48657]: https://github.com/rust-lang/rust/pull/48657
4131 [48735]: https://github.com/rust-lang/rust/pull/48735
4132 [48978]: https://github.com/rust-lang/rust/pull/48978
4133 [49101]: https://github.com/rust-lang/rust/pull/49101
4134 [49109]: https://github.com/rust-lang/rust/pull/49109
4135 [49121]: https://github.com/rust-lang/rust/pull/49121
4136 [49162]: https://github.com/rust-lang/rust/pull/49162
4137 [49184]: https://github.com/rust-lang/rust/pull/49184
4138 [49234]: https://github.com/rust-lang/rust/pull/49234
4139 [49255]: https://github.com/rust-lang/rust/pull/49255
4140 [49299]: https://github.com/rust-lang/rust/pull/49299
4141 [49305]: https://github.com/rust-lang/rust/pull/49305
4142 [49394]: https://github.com/rust-lang/rust/pull/49394
4143 [49458]: https://github.com/rust-lang/rust/pull/49458
4144 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4145 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4146 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4147 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4148 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4149 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4150 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4151 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4152 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4153 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4154 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4155 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4156 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4157 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4158 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4159 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4160 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4161 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4162 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4163 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4164 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4165 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4166 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4167 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4168 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4169 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4170 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4171 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4172 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4173 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4174 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4175 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4176 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4177 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4178 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4179 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4180 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4181 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4182 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4183 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4184 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4185 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4188 Version 1.25.0 (2018-03-29)
4189 ==========================
4193 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4194 - [You can now use nested groups of imports.][47948]
4195 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4196 - [You can now have `|` at the start of a match arm.][47947] e.g.
4198 enum Foo { A, B, C }
4204 | Foo::B => println!("AB"),
4205 | Foo::C => println!("C"),
4212 - [Upgraded to LLVM 6.][47828]
4213 - [Added `-C lto=val` option.][47521]
4214 - [Added `i586-unknown-linux-musl` target][47282]
4218 - [Impl Send for `process::Command` on Unix.][47760]
4219 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4220 - [`UnsafeCell::into_inner` is now safe.][47204]
4221 - [Implement libstd for CloudABI.][47268]
4222 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4223 - [Implement `AsRef<Path>` for Component][46985]
4224 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4225 - [Moved `Duration` to libcore.][46666]
4229 - [`Location::column`]
4232 The following functions can now be used in a constant expression.
4233 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4234 - [`Duration::new`][47300]
4235 - [`Duration::from_secs`][47300]
4236 - [`Duration::from_millis`][47300]
4240 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4241 - [`cargo new` now defaults to creating a binary crate, instead of a
4242 library crate.][cargo/5029]
4246 - [Rust by example is now shipped with new releases][46196]
4250 - [Deprecated `net::lookup_host`.][47510]
4251 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4252 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4253 around indexing operations (see [#47349][47349]). This has been fixed (which also
4254 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4255 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4257 [33903]: https://github.com/rust-lang/rust/pull/33903
4258 [47947]: https://github.com/rust-lang/rust/pull/47947
4259 [47948]: https://github.com/rust-lang/rust/pull/47948
4260 [47760]: https://github.com/rust-lang/rust/pull/47760
4261 [47790]: https://github.com/rust-lang/rust/pull/47790
4262 [47828]: https://github.com/rust-lang/rust/pull/47828
4263 [47398]: https://github.com/rust-lang/rust/pull/47398
4264 [47510]: https://github.com/rust-lang/rust/pull/47510
4265 [47521]: https://github.com/rust-lang/rust/pull/47521
4266 [47204]: https://github.com/rust-lang/rust/pull/47204
4267 [47251]: https://github.com/rust-lang/rust/pull/47251
4268 [47268]: https://github.com/rust-lang/rust/pull/47268
4269 [47282]: https://github.com/rust-lang/rust/pull/47282
4270 [47300]: https://github.com/rust-lang/rust/pull/47300
4271 [47349]: https://github.com/rust-lang/rust/pull/47349
4272 [46931]: https://github.com/rust-lang/rust/pull/46931
4273 [46985]: https://github.com/rust-lang/rust/pull/46985
4274 [47006]: https://github.com/rust-lang/rust/pull/47006
4275 [46830]: https://github.com/rust-lang/rust/pull/46830
4276 [46095]: https://github.com/rust-lang/rust/pull/46095
4277 [46666]: https://github.com/rust-lang/rust/pull/46666
4278 [46196]: https://github.com/rust-lang/rust/pull/46196
4279 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4280 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4281 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4282 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4283 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4286 Version 1.24.1 (2018-03-01)
4287 ==========================
4289 - [Do not abort when unwinding through FFI][48251]
4290 - [Emit UTF-16 files for linker arguments on Windows][48318]
4291 - [Make the error index generator work again][48308]
4292 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4294 [48251]: https://github.com/rust-lang/rust/issues/48251
4295 [48308]: https://github.com/rust-lang/rust/issues/48308
4296 [48318]: https://github.com/rust-lang/rust/issues/48318
4297 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4300 Version 1.24.0 (2018-02-15)
4301 ==========================
4305 - [External `sysv64` ffi is now available.][46528]
4306 eg. `extern "sysv64" fn foo () {}`
4310 - [rustc now uses 16 codegen units by default for release builds.][46910]
4311 For the fastest builds, utilize `codegen-units=1`.
4312 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4313 - [Add `aarch64-unknown-openbsd` support][46760]
4317 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4318 improvement in performance in the majority of cases.
4319 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4320 with Windows.][46798]
4321 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4322 - [impl `From<bool>` for `AtomicBool`][46293]
4323 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4324 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4325 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4326 - [float::from_bits now just uses transmute.][46012] This provides
4327 some optimisations from LLVM.
4328 - [Copied `AsciiExt` methods onto `char`][46077]
4329 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4330 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4331 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4332 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4336 - [`RefCell::replace`]
4338 - [`atomic::spin_loop_hint`]
4340 The following functions can now be used in a constant expression.
4341 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4343 - [`AtomicBool::new`][46287]
4344 - [`AtomicUsize::new`][46287]
4345 - [`AtomicIsize::new`][46287]
4346 - [`AtomicPtr::new`][46287]
4347 - [`Cell::new`][46287]
4348 - [`{integer}::min_value`][46287]
4349 - [`{integer}::max_value`][46287]
4350 - [`mem::size_of`][46287]
4351 - [`mem::align_of`][46287]
4352 - [`ptr::null`][46287]
4353 - [`ptr::null_mut`][46287]
4354 - [`RefCell::new`][46287]
4355 - [`UnsafeCell::new`][46287]
4359 - [Added a `workspace.default-members` config that
4360 overrides implied `--all` in virtual workspaces.][cargo/4743]
4361 - [Enable incremental by default on development builds.][cargo/4817] Also added
4362 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4363 per-project or global basis respectively.
4370 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4371 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4372 in accordance with IETF RFC 4291 §2.2.
4373 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4374 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4375 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4376 - [Leading zeros in tuple struct members is now an error][47084]
4377 - [`column!()` macro is one-based instead of zero-based][46977]
4378 - [`fmt::Arguments` can no longer be shared across threads][45198]
4379 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4380 - [Cargo sets a different working directory for the compiler][cargo/4788]
4382 [44884]: https://github.com/rust-lang/rust/pull/44884
4383 [45198]: https://github.com/rust-lang/rust/pull/45198
4384 [45506]: https://github.com/rust-lang/rust/pull/45506
4385 [45904]: https://github.com/rust-lang/rust/pull/45904
4386 [45990]: https://github.com/rust-lang/rust/pull/45990
4387 [46012]: https://github.com/rust-lang/rust/pull/46012
4388 [46077]: https://github.com/rust-lang/rust/pull/46077
4389 [46094]: https://github.com/rust-lang/rust/pull/46094
4390 [46284]: https://github.com/rust-lang/rust/pull/46284
4391 [46287]: https://github.com/rust-lang/rust/pull/46287
4392 [46293]: https://github.com/rust-lang/rust/pull/46293
4393 [46528]: https://github.com/rust-lang/rust/pull/46528
4394 [46671]: https://github.com/rust-lang/rust/pull/46671
4395 [46713]: https://github.com/rust-lang/rust/pull/46713
4396 [46735]: https://github.com/rust-lang/rust/pull/46735
4397 [46749]: https://github.com/rust-lang/rust/pull/46749
4398 [46760]: https://github.com/rust-lang/rust/pull/46760
4399 [46798]: https://github.com/rust-lang/rust/pull/46798
4400 [46828]: https://github.com/rust-lang/rust/pull/46828
4401 [46831]: https://github.com/rust-lang/rust/pull/46831
4402 [46833]: https://github.com/rust-lang/rust/pull/46833
4403 [46910]: https://github.com/rust-lang/rust/pull/46910
4404 [46977]: https://github.com/rust-lang/rust/pull/46977
4405 [47018]: https://github.com/rust-lang/rust/pull/47018
4406 [47080]: https://github.com/rust-lang/rust/pull/47080
4407 [47084]: https://github.com/rust-lang/rust/pull/47084
4408 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4409 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4410 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4411 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4412 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4413 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4416 Version 1.23.0 (2018-01-04)
4417 ==========================
4421 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4422 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4423 Which should fix some confusing errors in some operations.
4427 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4428 undefined behavior.][45920]
4429 - [rustc now suggests renaming import if names clash.][45660]
4430 - [Display errors/warnings correctly when there are zero-width or
4431 wide characters.][45711]
4432 - [rustc now avoids unnecessary copies of arguments that are
4433 simple bindings][45380] This should improve memory usage on average by 5-10%.
4434 - [Updated musl used to build musl rustc to 1.1.17][45393]
4438 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4439 - [Implement Hash for raw pointers to unsized types][45483]
4440 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4441 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4442 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4443 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4444 and `<*mut T>::as_mut`][44932]
4445 - [Optimized `Thread::{park, unpark}` implementation][45524]
4446 - [Improved `SliceExt::binary_search` performance.][45333]
4447 - [impl `FromIterator<()>` for `()`][45379]
4448 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4456 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4457 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4458 - [Added unit test checking to `cargo check`][cargo/4592]
4459 - [Cargo now lets you install a specific version
4460 using `cargo install --version`][cargo/4637]
4464 - [Releases now ship with the Cargo book documentation.][45692]
4465 - [rustdoc now prints rendering warnings on every run.][45324]
4469 - [Changes have been made to type equality to make it more correct,
4470 in rare cases this could break some code.][45853] [Tracking issue for
4471 further information][45852]
4472 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4473 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4474 Android 9, the minimum supported version is Android 14.
4475 - [Bumped the minimum LLVM to 3.9][45326]
4477 [44042]: https://github.com/rust-lang/rust/pull/44042
4478 [44932]: https://github.com/rust-lang/rust/pull/44932
4479 [45267]: https://github.com/rust-lang/rust/pull/45267
4480 [45324]: https://github.com/rust-lang/rust/pull/45324
4481 [45326]: https://github.com/rust-lang/rust/pull/45326
4482 [45333]: https://github.com/rust-lang/rust/pull/45333
4483 [45379]: https://github.com/rust-lang/rust/pull/45379
4484 [45380]: https://github.com/rust-lang/rust/pull/45380
4485 [45393]: https://github.com/rust-lang/rust/pull/45393
4486 [45435]: https://github.com/rust-lang/rust/pull/45435
4487 [45483]: https://github.com/rust-lang/rust/pull/45483
4488 [45524]: https://github.com/rust-lang/rust/pull/45524
4489 [45571]: https://github.com/rust-lang/rust/pull/45571
4490 [45580]: https://github.com/rust-lang/rust/pull/45580
4491 [45610]: https://github.com/rust-lang/rust/pull/45610
4492 [45660]: https://github.com/rust-lang/rust/pull/45660
4493 [45692]: https://github.com/rust-lang/rust/pull/45692
4494 [45711]: https://github.com/rust-lang/rust/pull/45711
4495 [45772]: https://github.com/rust-lang/rust/pull/45772
4496 [45852]: https://github.com/rust-lang/rust/issues/45852
4497 [45853]: https://github.com/rust-lang/rust/pull/45853
4498 [45887]: https://github.com/rust-lang/rust/pull/45887
4499 [45920]: https://github.com/rust-lang/rust/pull/45920
4500 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4501 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4502 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4505 Version 1.22.1 (2017-11-22)
4506 ==========================
4508 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4510 [46183]: https://github.com/rust-lang/rust/pull/46183
4512 Version 1.22.0 (2017-11-22)
4513 ==========================
4517 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4518 - [Now accepts underscores in unicode escapes][43716]
4519 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4520 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4524 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4525 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4526 This should decrease compile times for debug builds.
4527 - [strict memory alignment now enabled on ARMv6][45094]
4528 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4532 - [Allow atomic operations up to 32 bits
4533 on `armv5te_unknown_linux_gnueabi`][44978]
4534 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4535 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4536 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4537 - [Properly detect overflow in `Instant += Duration`.][44220]
4538 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4539 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4540 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4547 - [Cargo will now build multi file examples in subdirectories of the `examples`
4548 folder that have a `main.rs` file.][cargo/4496]
4549 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4550 the old format will continue to work and can be updated with `cargo update`.
4551 - [Now supports vendoring git repositories][cargo/3992]
4555 - [`libbacktrace` is now available on Apple platforms.][44251]
4556 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4557 This now lets you specify that a given code example will fail to compile.
4561 - [The minimum Android version that rustc can build for has been bumped
4562 to `4.0` from `2.3`][45656]
4563 - [Allowing `T op= &T` for numeric types has broken some type
4564 inference cases][45480]
4567 [42526]: https://github.com/rust-lang/rust/pull/42526
4568 [43017]: https://github.com/rust-lang/rust/pull/43017
4569 [43716]: https://github.com/rust-lang/rust/pull/43716
4570 [43949]: https://github.com/rust-lang/rust/pull/43949
4571 [44015]: https://github.com/rust-lang/rust/pull/44015
4572 [44220]: https://github.com/rust-lang/rust/pull/44220
4573 [44251]: https://github.com/rust-lang/rust/pull/44251
4574 [44287]: https://github.com/rust-lang/rust/pull/44287
4575 [44303]: https://github.com/rust-lang/rust/pull/44303
4576 [44456]: https://github.com/rust-lang/rust/pull/44456
4577 [44466]: https://github.com/rust-lang/rust/pull/44466
4578 [44895]: https://github.com/rust-lang/rust/pull/44895
4579 [44966]: https://github.com/rust-lang/rust/pull/44966
4580 [44978]: https://github.com/rust-lang/rust/pull/44978
4581 [45041]: https://github.com/rust-lang/rust/pull/45041
4582 [45064]: https://github.com/rust-lang/rust/pull/45064
4583 [45075]: https://github.com/rust-lang/rust/pull/45075
4584 [45094]: https://github.com/rust-lang/rust/pull/45094
4585 [45095]: https://github.com/rust-lang/rust/pull/45095
4586 [45480]: https://github.com/rust-lang/rust/issues/45480
4587 [45656]: https://github.com/rust-lang/rust/pull/45656
4588 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4589 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4590 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4597 Version 1.21.0 (2017-10-12)
4598 ==========================
4602 - [You can now use static references for literals.][43838]
4606 let x: &'static u32 = &0;
4609 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4612 my_macro!(Vec<i32>::new); // Always worked
4613 my_macro!(Vec::<i32>::new); // Now works
4618 - [Upgraded jemalloc to 4.5.0][43911]
4619 - [Enabled unwinding panics on Redox][43917]
4620 - [Now runs LLVM in parallel during translation phase.][43506]
4621 This should reduce peak memory usage.
4625 - [Generate builtin impls for `Clone` for all arrays and tuples that
4626 are `T: Clone`][43690]
4627 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4628 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4629 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4634 [`std::mem::discriminant`]
4638 - [You can now call `cargo install` with multiple package names][cargo/4216]
4639 - [Cargo commands inside a virtual workspace will now implicitly
4640 pass `--all`][cargo/4335]
4641 - [Added a `[patch]` section to `Cargo.toml` to handle
4642 prepublication dependencies][cargo/4123] [RFC 1969]
4643 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4644 like patterns][cargo/4270]
4645 - [Added the `--all-targets` option][cargo/4400]
4646 - [Using required dependencies as a feature is now deprecated and emits
4647 a warning][cargo/4364]
4652 - [Cargo docs are moving][43916]
4653 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4654 - [The rustdoc book is now available][43863]
4655 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4656 - [Added a preview of RLS has been made available through rustup][44204]
4657 Install with `rustup component add rls-preview`
4658 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4659 Previously only showed `std::os::unix`.
4663 - [Changes in method matching against higher-ranked types][43880] This may cause
4664 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4665 - [rustc's JSON error output's byte position start at top of file.][42973]
4666 Was previously relative to the rustc's internal `CodeMap` struct which
4667 required the unstable library `libsyntax` to correctly use.
4668 - [`unused_results` lint no longer ignores booleans][43728]
4670 [42565]: https://github.com/rust-lang/rust/pull/42565
4671 [42973]: https://github.com/rust-lang/rust/pull/42973
4672 [43348]: https://github.com/rust-lang/rust/pull/43348
4673 [43459]: https://github.com/rust-lang/rust/pull/43459
4674 [43506]: https://github.com/rust-lang/rust/pull/43506
4675 [43540]: https://github.com/rust-lang/rust/pull/43540
4676 [43690]: https://github.com/rust-lang/rust/pull/43690
4677 [43728]: https://github.com/rust-lang/rust/pull/43728
4678 [43838]: https://github.com/rust-lang/rust/pull/43838
4679 [43863]: https://github.com/rust-lang/rust/pull/43863
4680 [43880]: https://github.com/rust-lang/rust/pull/43880
4681 [43911]: https://github.com/rust-lang/rust/pull/43911
4682 [43916]: https://github.com/rust-lang/rust/pull/43916
4683 [43917]: https://github.com/rust-lang/rust/pull/43917
4684 [44204]: https://github.com/rust-lang/rust/pull/44204
4685 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4686 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4687 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4688 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4689 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4690 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4691 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4692 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4693 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4695 Version 1.20.0 (2017-08-31)
4696 ===========================
4700 - [Associated constants are now stabilised.][42809]
4701 - [A lot of macro bugs are now fixed.][42913]
4706 - [Struct fields are now properly coerced to the expected field type.][42807]
4707 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4708 `wasm32-experimental-emscripten` target.
4709 - [Changed some of the error messages to be more helpful.][42033]
4710 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4712 - [rustc now reports the total number of errors on compilation failure][43015]
4713 previously this was only the number of errors in the pass that failed.
4714 - [Expansion in rustc has been sped up 29x.][42533]
4715 - [added `msp430-none-elf` target.][43099]
4716 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4718 - [Fixes backtraces on Redox][43228]
4719 - [rustc now identifies different versions of same crate when absolute paths of
4720 different types match in an error message.][42826]
4726 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4727 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4729 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4730 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4731 - [Impl `Clone` for `DefaultHasher`.][42799]
4732 - [Impl `Sync` for `SyncSender`.][42397]
4733 - [Impl `FromStr` for `char`][42271]
4734 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4736 - [allow messages in the `unimplemented!()` macro.][42155]
4737 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4738 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4739 - [Upgrade to Unicode 10.0.0][42999]
4740 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4741 - [Skip the main thread's manual stack guard on Linux][43072]
4742 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4743 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4745 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4750 - [`CStr::into_c_string`]
4751 - [`CString::as_c_str`]
4752 - [`CString::into_boxed_c_str`]
4753 - [`Chain::get_mut`]
4754 - [`Chain::get_ref`]
4755 - [`Chain::into_inner`]
4756 - [`Option::get_or_insert_with`]
4757 - [`Option::get_or_insert`]
4758 - [`OsStr::into_os_string`]
4759 - [`OsString::into_boxed_os_str`]
4762 - [`Utf8Error::error_len`]
4763 - [`char::EscapeDebug`]
4764 - [`char::escape_debug`]
4765 - [`compile_error!`]
4766 - [`f32::from_bits`]
4768 - [`f64::from_bits`]
4770 - [`mem::ManuallyDrop`]
4771 - [`slice::sort_unstable_by_key`]
4772 - [`slice::sort_unstable_by`]
4773 - [`slice::sort_unstable`]
4774 - [`str::from_boxed_utf8_unchecked`]
4775 - [`str::as_bytes_mut`]
4776 - [`str::as_bytes_mut`]
4777 - [`str::from_utf8_mut`]
4778 - [`str::from_utf8_unchecked_mut`]
4780 - [`str::get_unchecked_mut`]
4781 - [`str::get_unchecked`]
4783 - [`str::into_boxed_bytes`]
4788 - [Cargo API token location moved from `~/.cargo/config` to
4789 `~/.cargo/credentials`.][cargo/3978]
4790 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4791 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4792 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4793 - [You can now specify version of a binary when installed through
4794 `cargo install` using `--vers`.][cargo/4229]
4795 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4796 failure.][cargo/4248]
4797 - [Changed the convention around which file is the crate root.][cargo/4259]
4798 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4799 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4804 - [Functions with `'static` in their return types will now not be as usable as
4805 if they were using lifetime parameters instead.][42417]
4806 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4807 takes the sign of NaN into account where previously didn't.][42430]
4809 [42033]: https://github.com/rust-lang/rust/pull/42033
4810 [42155]: https://github.com/rust-lang/rust/pull/42155
4811 [42271]: https://github.com/rust-lang/rust/pull/42271
4812 [42397]: https://github.com/rust-lang/rust/pull/42397
4813 [42417]: https://github.com/rust-lang/rust/pull/42417
4814 [42430]: https://github.com/rust-lang/rust/pull/42430
4815 [42431]: https://github.com/rust-lang/rust/pull/42431
4816 [42533]: https://github.com/rust-lang/rust/pull/42533
4817 [42571]: https://github.com/rust-lang/rust/pull/42571
4818 [42613]: https://github.com/rust-lang/rust/pull/42613
4819 [42799]: https://github.com/rust-lang/rust/pull/42799
4820 [42807]: https://github.com/rust-lang/rust/pull/42807
4821 [42809]: https://github.com/rust-lang/rust/pull/42809
4822 [42822]: https://github.com/rust-lang/rust/pull/42822
4823 [42826]: https://github.com/rust-lang/rust/pull/42826
4824 [42854]: https://github.com/rust-lang/rust/pull/42854
4825 [42913]: https://github.com/rust-lang/rust/pull/42913
4826 [42999]: https://github.com/rust-lang/rust/pull/42999
4827 [43011]: https://github.com/rust-lang/rust/pull/43011
4828 [43015]: https://github.com/rust-lang/rust/pull/43015
4829 [43072]: https://github.com/rust-lang/rust/pull/43072
4830 [43077]: https://github.com/rust-lang/rust/pull/43077
4831 [43097]: https://github.com/rust-lang/rust/pull/43097
4832 [43099]: https://github.com/rust-lang/rust/pull/43099
4833 [43170]: https://github.com/rust-lang/rust/pull/43170
4834 [43178]: https://github.com/rust-lang/rust/pull/43178
4835 [43185]: https://github.com/rust-lang/rust/pull/43185
4836 [43228]: https://github.com/rust-lang/rust/pull/43228
4837 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4838 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4839 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4840 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4841 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4842 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4843 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4844 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4845 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4846 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4847 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4848 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4849 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4850 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4851 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4852 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4853 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4854 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4855 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4856 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4857 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4858 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4859 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4860 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4861 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4862 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4863 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4864 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4865 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4866 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4867 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4868 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4869 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4870 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4871 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4872 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4873 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4874 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4875 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4878 Version 1.19.0 (2017-07-20)
4879 ===========================
4884 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4885 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4886 - [Macro recursion limit increased to 1024 from 64.][41676]
4887 - [Added lint for detecting unused macros.][41907]
4888 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4889 For example: `let x = loop { break 7; };`
4890 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4891 contain `Copy` types and cannot have a `Drop` implementation.
4892 Example: `union Foo { bar: u8, baz: usize }`
4893 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4894 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4899 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4900 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4901 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4902 you should use `--target armv7-linux-androideabi`.
4903 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4904 - [Minor optimisation of string operations.][42037]
4905 - [Compiler error message is now `aborting due to previous error(s)` instead of
4906 `aborting due to N previous errors`][42150] This was previously inaccurate and
4907 would only count certain kinds of errors.
4908 - [The compiler now supports Visual Studio 2017][42225]
4909 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4910 - [Added a lot][42264] of [new error codes][42302]
4911 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4912 libraries with C Run-time Libraries(CRT) to be statically linked.
4913 - [Fixed various ARM codegen bugs][42740]
4918 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4919 `Extend<Cow<'a, str>>`][41449]
4920 - [`Vec` now implements `From<&mut [T]>`][41530]
4921 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4922 - [`SplitWhitespace` now implements `Clone`][41659]
4923 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4925 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4926 macros, but for printing to stderr.
4931 - [`OsString::shrink_to_fit`]
4934 - [`thread::ThreadId`]
4939 - [Build scripts can now add environment variables to the environment
4940 the crate is being compiled in.
4941 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4942 - [Subcommands now replace the current process rather than spawning a new
4943 child process][cargo/3970]
4944 - [Workspace members can now accept glob file patterns][cargo/3979]
4945 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4946 the members in a given workspace.][cargo/3988]
4947 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4948 - [Target directory path is now in the cargo metadata][cargo/4022]
4949 - [Cargo no longer checks out a local working directory for the
4950 crates.io index][cargo/4026] This should provide smaller file size for the
4951 registry, and improve cloning times, especially on Windows machines.
4952 - [Added an `--exclude` option for excluding certain packages when using the
4953 `--all` option][cargo/4031]
4954 - [Cargo will now automatically retry when receiving a 5xx error
4955 from crates.io][cargo/4032]
4956 - [The `--features` option now accepts multiple comma or space
4957 delimited values.][cargo/4084]
4958 - [Added support for custom target specific runners][cargo/3954]
4963 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4965 - [Rust will now release XZ compressed packages][rust-installer/57]
4966 - [rustup will now prefer to download rust packages with
4967 XZ compression][rustup/1100] over GZip packages.
4968 - [Added the ability to escape `#` in rust documentation][41785] By adding
4969 additional `#`'s ie. `##` is now `#`
4974 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4975 - [`-Z` flags are now no longer allowed to be used on the stable
4976 compiler.][41751] This has been a warning for a year previous to this.
4977 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4978 longer works][42844]. Users should migrate to the built-in `check`
4979 command, which has been available since 1.16.
4980 - [Ending a float literal with `._` is now a hard error.
4981 Example: `42._` .][41946]
4982 - [Any use of a private `extern crate` outside of its module is now a
4983 hard error.][36886] This was previously a warning.
4984 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4985 relative while the `::` prefix makes a path absolute, but was ignored and the
4986 path was relative regardless.
4987 - [Floating point constants in match patterns is now a hard error][36890]
4988 This was previously a warning.
4989 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4990 match patterns is now a hard error][36891] This was previously a warning.
4991 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4993 - [From the pound escape, lines consisting of multiple `#`s are
4995 - [It is an error to re-export private enum variants][42460]. This is
4996 known to break a number of crates that depend on an older version of
4998 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4999 to use it to find the linker, and the build will fail where it did
5000 not previously][42607]
5002 [36886]: https://github.com/rust-lang/rust/issues/36886
5003 [36888]: https://github.com/rust-lang/rust/issues/36888
5004 [36890]: https://github.com/rust-lang/rust/issues/36890
5005 [36891]: https://github.com/rust-lang/rust/issues/36891
5006 [36892]: https://github.com/rust-lang/rust/issues/36892
5007 [37406]: https://github.com/rust-lang/rust/issues/37406
5008 [39983]: https://github.com/rust-lang/rust/pull/39983
5009 [41145]: https://github.com/rust-lang/rust/pull/41145
5010 [41192]: https://github.com/rust-lang/rust/pull/41192
5011 [41258]: https://github.com/rust-lang/rust/pull/41258
5012 [41370]: https://github.com/rust-lang/rust/pull/41370
5013 [41449]: https://github.com/rust-lang/rust/pull/41449
5014 [41530]: https://github.com/rust-lang/rust/pull/41530
5015 [41624]: https://github.com/rust-lang/rust/pull/41624
5016 [41656]: https://github.com/rust-lang/rust/pull/41656
5017 [41659]: https://github.com/rust-lang/rust/pull/41659
5018 [41676]: https://github.com/rust-lang/rust/pull/41676
5019 [41751]: https://github.com/rust-lang/rust/pull/41751
5020 [41764]: https://github.com/rust-lang/rust/pull/41764
5021 [41785]: https://github.com/rust-lang/rust/pull/41785
5022 [41873]: https://github.com/rust-lang/rust/pull/41873
5023 [41907]: https://github.com/rust-lang/rust/pull/41907
5024 [41946]: https://github.com/rust-lang/rust/pull/41946
5025 [42016]: https://github.com/rust-lang/rust/pull/42016
5026 [42037]: https://github.com/rust-lang/rust/pull/42037
5027 [42068]: https://github.com/rust-lang/rust/pull/42068
5028 [42150]: https://github.com/rust-lang/rust/pull/42150
5029 [42162]: https://github.com/rust-lang/rust/pull/42162
5030 [42225]: https://github.com/rust-lang/rust/pull/42225
5031 [42264]: https://github.com/rust-lang/rust/pull/42264
5032 [42302]: https://github.com/rust-lang/rust/pull/42302
5033 [42460]: https://github.com/rust-lang/rust/issues/42460
5034 [42607]: https://github.com/rust-lang/rust/issues/42607
5035 [42740]: https://github.com/rust-lang/rust/pull/42740
5036 [42844]: https://github.com/rust-lang/rust/issues/42844
5037 [42948]: https://github.com/rust-lang/rust/pull/42948
5038 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5039 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5040 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5041 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5042 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5043 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5044 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5045 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5046 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5047 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5048 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5049 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5050 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5051 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5052 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5053 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5054 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5055 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5056 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5057 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5058 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5059 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5062 Version 1.18.0 (2017-06-08)
5063 ===========================
5068 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5069 make the item visible to just that module tree. Also accepts the keyword
5070 `crate` to make something public to the whole crate but not users of the
5071 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5072 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5073 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5074 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5075 types like `Write + Send`, trailing `+` are now supported in trait objects,
5076 and better error reporting for trait objects starting with `?Sized`.
5077 - [0e+10 is now a valid floating point literal][40589]
5078 - [Now warns if you bind a lifetime parameter to 'static][40734]
5079 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5080 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5081 representation in some cases.][40377]
5086 - [rustc can now emit mir with `--emit mir`][39891]
5087 - [Improved LLVM IR for trivial functions][40367]
5088 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5089 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5090 opportunities found through profiling
5091 - [Improved backtrace formatting when panicking][38165]
5096 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5097 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5098 iteration or reallocation.
5099 - [Simplified HashMap Bucket interface][40561] provides performance
5100 improvements for iterating and cloning.
5101 - [Specialize Vec::from_elem to use calloc][40409]
5102 - [Fixed Race condition in fs::create_dir_all][39799]
5103 - [No longer caching stdio on Windows][40516]
5104 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5105 2.50%~ faster and in one case now 12.50% faster.
5106 - [Optimized `AtomicBool::fetch_nand`][41143]
5111 - [`Child::try_wait`]
5112 - [`HashMap::retain`]
5113 - [`HashSet::retain`]
5115 - [`TcpStream::peek`]
5116 - [`UdpSocket::peek`]
5117 - [`UdpSocket::peek_from`]
5122 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5123 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5124 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5125 - [Added Android build support][cargo/3885]
5126 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5127 of a certain type, for example `cargo build --bins` will build all
5129 - [Added support for haiku][cargo/3952]
5134 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5135 - [Added rust-windbg script for better debugging on Windows][39983]
5136 - [Rust now uses the official cross compiler for NetBSD][40612]
5137 - [rustdoc now accepts `#` at the start of files][40828]
5138 - [Fixed jemalloc support for musl][41168]
5143 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5144 always placed after the sign if it exists and before the digits. With the `#`
5145 flag the zeroes are placed after the prefix and before the digits.
5146 - [Due to the struct field optimisation][40377], using `transmute` on structs
5147 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5148 always been undefined behavior, but is now more likely to break in practice.
5149 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5150 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5151 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5152 - [Overlapping inherent `impl`s are now a hard error][40728]
5153 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5154 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5155 `out.asm` and `out.ll` instead of only one of the filetypes.
5156 - [ calling a function that returns `Self` will no longer work][41805] when
5157 the size of `Self` cannot be statically determined.
5158 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5159 this has caused a few regressions namely:
5161 - Changed the link order of local static/dynamic libraries (respecting the
5162 order on given rather than having the compiler reorder).
5163 - Changed how MinGW is linked, native code linked to dynamic libraries
5164 may require manually linking to the gcc support library (for the native
5167 [38165]: https://github.com/rust-lang/rust/pull/38165
5168 [39799]: https://github.com/rust-lang/rust/pull/39799
5169 [39891]: https://github.com/rust-lang/rust/pull/39891
5170 [39983]: https://github.com/rust-lang/rust/pull/39983
5171 [40043]: https://github.com/rust-lang/rust/pull/40043
5172 [40241]: https://github.com/rust-lang/rust/pull/40241
5173 [40338]: https://github.com/rust-lang/rust/pull/40338
5174 [40367]: https://github.com/rust-lang/rust/pull/40367
5175 [40377]: https://github.com/rust-lang/rust/pull/40377
5176 [40409]: https://github.com/rust-lang/rust/pull/40409
5177 [40516]: https://github.com/rust-lang/rust/pull/40516
5178 [40556]: https://github.com/rust-lang/rust/pull/40556
5179 [40561]: https://github.com/rust-lang/rust/pull/40561
5180 [40589]: https://github.com/rust-lang/rust/pull/40589
5181 [40612]: https://github.com/rust-lang/rust/pull/40612
5182 [40723]: https://github.com/rust-lang/rust/pull/40723
5183 [40728]: https://github.com/rust-lang/rust/pull/40728
5184 [40731]: https://github.com/rust-lang/rust/pull/40731
5185 [40734]: https://github.com/rust-lang/rust/pull/40734
5186 [40805]: https://github.com/rust-lang/rust/pull/40805
5187 [40807]: https://github.com/rust-lang/rust/pull/40807
5188 [40828]: https://github.com/rust-lang/rust/pull/40828
5189 [40870]: https://github.com/rust-lang/rust/pull/40870
5190 [41085]: https://github.com/rust-lang/rust/pull/41085
5191 [41143]: https://github.com/rust-lang/rust/pull/41143
5192 [41168]: https://github.com/rust-lang/rust/pull/41168
5193 [41270]: https://github.com/rust-lang/rust/issues/41270
5194 [41469]: https://github.com/rust-lang/rust/pull/41469
5195 [41805]: https://github.com/rust-lang/rust/issues/41805
5196 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5197 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5198 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5199 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5200 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5201 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5202 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5203 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5204 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5205 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5206 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5207 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5208 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5209 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5212 Version 1.17.0 (2017-04-27)
5213 ===========================
5218 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5219 * [Fields of structs may be initialized without duplicating the field/variable
5220 names][39761]. [RFC 1682]
5221 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5222 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5223 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5224 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5225 `'b`. Soundness fix.
5226 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5227 * [Static variables may contain references to other statics][40027]
5232 * [Exit quickly on only `--emit dep-info`][40336]
5233 * [Make `-C relocation-model` more correctly determine whether the linker
5234 creates a position-independent executable][40245]
5235 * [Add `-C overflow-checks` to directly control whether integer overflow
5237 * [The rustc type checker now checks items on demand instead of in a single
5238 in-order pass][40008]. This is mostly an internal refactoring in support of
5239 future work, including incremental type checking, but also resolves [RFC
5240 1647], allowing `Self` to appear in `impl` `where` clauses.
5241 * [Optimize vtable loads][39995]
5242 * [Turn off vectorization for Emscripten targets][39990]
5243 * [Provide suggestions for unknown macros imported with `use`][39953]
5244 * [Fix ICEs in path resolution][39939]
5245 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5246 * [Add clearer error message using `&str + &str`][39116]
5257 * [`Ordering::then`]
5258 * [`Ordering::then_with`]
5259 * [`BTreeMap::range`]
5260 * [`BTreeMap::range_mut`]
5261 * [`collections::Bound`]
5262 * [`process::abort`]
5263 * [`ptr::read_unaligned`]
5264 * [`ptr::write_unaligned`]
5265 * [`Result::expect_err`]
5268 * [`Cell::into_inner`]
5274 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5275 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5276 * [`String` implements `FromIterator<&char>`][40028]
5277 * `Box` [implements][40009] a number of new conversions:
5278 `From<Box<str>> for String`,
5279 `From<Box<[T]>> for Vec<T>`,
5280 `From<Box<CStr>> for CString`,
5281 `From<Box<OsStr>> for OsString`,
5282 `From<Box<Path>> for PathBuf`,
5283 `Into<Box<str>> for String`,
5284 `Into<Box<[T]>> for Vec<T>`,
5285 `Into<Box<CStr>> for CString`,
5286 `Into<Box<OsStr>> for OsString`,
5287 `Into<Box<Path>> for PathBuf`,
5288 `Default for Box<str>`,
5289 `Default for Box<CStr>`,
5290 `Default for Box<OsStr>`,
5291 `From<&CStr> for Box<CStr>`,
5292 `From<&OsStr> for Box<OsStr>`,
5293 `From<&Path> for Box<Path>`
5294 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5295 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5296 * [Slightly optimize `slice::sort`][39538]
5297 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5298 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5299 `Box<str>` implements `From<&str>`][39438]
5300 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5301 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5302 * [`format!` estimates the needed capacity before writing a string][39356]
5303 * [Support unprivileged symlink creation in Windows][38921]
5304 * [`PathBuf` implements `Default`][38764]
5305 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5306 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5307 and poor hash functions.
5312 * [Add `cargo check --all`][cargo/3731]
5313 * [Add an option to ignore SSL revocation checking][cargo/3699]
5314 * [Add `cargo run --package`][cargo/3691]
5315 * [Add `required_features`][cargo/3667]
5316 * [Assume `build.rs` is a build script][cargo/3664]
5317 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5322 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5324 * [The "Unstable Book" documents nightly-only features][ubook]
5325 * [Improve the style of the sidebar in rustdoc output][40265]
5326 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5327 * [Fix MSP430 breakage due to `i128`][40257]
5328 * [Preliminary Solaris/SPARCv9 support][39903]
5329 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5330 run without installing the MSVC runtime.
5331 * [`rustdoc --test` includes file names in test names][39788]
5332 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5333 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5334 * [Initial support for `aarch64-unknown-freebsd`][39491]
5335 * [Initial support for `i686-unknown-netbsd`][39426]
5336 * [This release no longer includes the old makefile build system][39431]. Rust
5337 is built with a custom build system, written in Rust, and with Cargo.
5338 * [Add Debug implementations for libcollection structs][39002]
5339 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5340 * [`--test-threads=0` produces an error][38945]
5341 * [`rustup` installs documentation by default][40526]
5342 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5343 WinDbg and Visual Studio to improve the debugging experience.
5348 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5349 workaround, either use MSVC 2015 or run vcvars.bat.
5350 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5351 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5352 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5354 * [`format!` and `Display::to_string` panic if an underlying formatting
5355 implementation returns an error][40117]. Previously the error was silently
5356 ignored. It is incorrect for `write_fmt` to return an error when writing
5358 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5359 crates were marked stable and could be accessed from the stable toolchain.
5360 * [Rust git source no longer includes vendored crates][39728]. Those that need
5361 to build with vendored crates should build from release tarballs.
5362 * [Fix inert attributes from `proc_macro_derives`][39572]
5363 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5364 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5366 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5367 existing code generally ignores the type of dead-code unless a type-hint is
5368 provided; this can cause surprising inference interactions particularly around
5369 defaulting. The new code uniformly ignores the result type of dead-code.
5370 * [Tuple-struct constructors with private fields are no longer visible][38932]
5371 * [Lifetime parameters that do not appear in the arguments are now considered
5372 early-bound][38897], resolving a soundness bug (#[32330]). The
5373 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5375 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5376 * [Make transmuting from fn item types to pointer-sized types a hard
5379 [27787]: https://github.com/rust-lang/rust/issues/27787
5380 [32330]: https://github.com/rust-lang/rust/issues/32330
5381 [34198]: https://github.com/rust-lang/rust/pull/34198
5382 [38161]: https://github.com/rust-lang/rust/pull/38161
5383 [38368]: https://github.com/rust-lang/rust/pull/38368
5384 [38584]: https://github.com/rust-lang/rust/issues/38584
5385 [38661]: https://github.com/rust-lang/rust/pull/38661
5386 [38764]: https://github.com/rust-lang/rust/pull/38764
5387 [38864]: https://github.com/rust-lang/rust/issues/38864
5388 [38897]: https://github.com/rust-lang/rust/pull/38897
5389 [38921]: https://github.com/rust-lang/rust/pull/38921
5390 [38932]: https://github.com/rust-lang/rust/pull/38932
5391 [38945]: https://github.com/rust-lang/rust/pull/38945
5392 [38981]: https://github.com/rust-lang/rust/pull/38981
5393 [39002]: https://github.com/rust-lang/rust/pull/39002
5394 [39116]: https://github.com/rust-lang/rust/pull/39116
5395 [39193]: https://github.com/rust-lang/rust/pull/39193
5396 [39265]: https://github.com/rust-lang/rust/pull/39265
5397 [39356]: https://github.com/rust-lang/rust/pull/39356
5398 [39372]: https://github.com/rust-lang/rust/pull/39372
5399 [39426]: https://github.com/rust-lang/rust/pull/39426
5400 [39431]: https://github.com/rust-lang/rust/pull/39431
5401 [39438]: https://github.com/rust-lang/rust/pull/39438
5402 [39440]: https://github.com/rust-lang/rust/pull/39440
5403 [39485]: https://github.com/rust-lang/rust/pull/39485
5404 [39491]: https://github.com/rust-lang/rust/pull/39491
5405 [39518]: https://github.com/rust-lang/rust/pull/39518
5406 [39538]: https://github.com/rust-lang/rust/pull/39538
5407 [39572]: https://github.com/rust-lang/rust/pull/39572
5408 [39633]: https://github.com/rust-lang/rust/pull/39633
5409 [39642]: https://github.com/rust-lang/rust/pull/39642
5410 [39728]: https://github.com/rust-lang/rust/pull/39728
5411 [39761]: https://github.com/rust-lang/rust/pull/39761
5412 [39788]: https://github.com/rust-lang/rust/pull/39788
5413 [39793]: https://github.com/rust-lang/rust/pull/39793
5414 [39837]: https://github.com/rust-lang/rust/pull/39837
5415 [39843]: https://github.com/rust-lang/rust/pull/39843
5416 [39851]: https://github.com/rust-lang/rust/pull/39851
5417 [39903]: https://github.com/rust-lang/rust/pull/39903
5418 [39939]: https://github.com/rust-lang/rust/pull/39939
5419 [39953]: https://github.com/rust-lang/rust/pull/39953
5420 [39960]: https://github.com/rust-lang/rust/pull/39960
5421 [39990]: https://github.com/rust-lang/rust/pull/39990
5422 [39995]: https://github.com/rust-lang/rust/pull/39995
5423 [40008]: https://github.com/rust-lang/rust/pull/40008
5424 [40009]: https://github.com/rust-lang/rust/pull/40009
5425 [40027]: https://github.com/rust-lang/rust/pull/40027
5426 [40028]: https://github.com/rust-lang/rust/pull/40028
5427 [40037]: https://github.com/rust-lang/rust/pull/40037
5428 [40117]: https://github.com/rust-lang/rust/pull/40117
5429 [40166]: https://github.com/rust-lang/rust/pull/40166
5430 [40245]: https://github.com/rust-lang/rust/pull/40245
5431 [40257]: https://github.com/rust-lang/rust/pull/40257
5432 [40261]: https://github.com/rust-lang/rust/pull/40261
5433 [40265]: https://github.com/rust-lang/rust/pull/40265
5434 [40319]: https://github.com/rust-lang/rust/pull/40319
5435 [40336]: https://github.com/rust-lang/rust/pull/40336
5436 [40526]: https://github.com/rust-lang/rust/pull/40526
5437 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5438 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5439 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5440 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5441 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5442 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5443 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5444 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5445 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5446 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5447 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5448 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5449 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5450 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5451 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5452 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5453 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5454 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5455 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5456 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5457 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5458 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5459 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5460 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5461 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5462 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5463 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5464 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5465 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5466 [mdbook]: https://crates.io/crates/mdbook
5467 [ubook]: https://doc.rust-lang.org/unstable-book/
5470 Version 1.16.0 (2017-03-16)
5471 ===========================
5476 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5477 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5478 match patterns][38069]
5479 * [Clean up semantics of `self` in an import list][38313]
5480 * [`Self` may appear in `impl` headers][38920]
5481 * [`Self` may appear in struct expressions][39282]
5486 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5487 a `.rmeta` file containing only crate metadata][38571]. This can be
5488 used by tools like the Rust Language Service to perform
5489 metadata-only builds.
5490 * [Levenshtein based typo suggestions now work in most places, while
5491 previously they worked only for fields and sometimes for local
5492 variables][38927]. Together with the overhaul of "no
5493 resolution"/"unexpected resolution" errors (#[38154]) they result in
5494 large and systematic improvement in resolution diagnostics.
5495 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5497 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5498 * [`rustc` no longer attempts to provide "consider using an explicit
5499 lifetime" suggestions][37057]. They were inaccurate.
5504 * [`VecDeque::truncate`]
5505 * [`VecDeque::resize`]
5506 * [`String::insert_str`]
5507 * [`Duration::checked_add`]
5508 * [`Duration::checked_sub`]
5509 * [`Duration::checked_div`]
5510 * [`Duration::checked_mul`]
5513 * [`SocketAddr::is_ipv4`]
5514 * [`SocketAddr::is_ipv6`]
5515 * [`IpAddr::is_ipv4`]
5516 * [`IpAddr::is_ipv6`]
5518 * [`Vec::dedup_by_key`]
5519 * [`Result::unwrap_or_default`]
5520 * [`<*const T>::wrapping_offset`]
5521 * [`<*mut T>::wrapping_offset`]
5522 * `CommandExt::creation_flags`
5523 * [`File::set_permissions`]
5524 * [`String::split_off`]
5529 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5530 their argument by `Borrow` parameter][37761]
5531 * [All public types in std implement `Debug`][38006]
5532 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5533 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5534 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5536 * [std: Fix partial writes in `LineWriter`][38062]
5537 * [std: Clamp max read/write sizes on Unix][38062]
5538 * [Use more specific panic message for `&str` slicing errors][38066]
5539 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5540 functionality cannot be achieved in std currently.
5541 * [`writeln!`, like `println!`, now accepts a form with no string
5542 or formatting arguments, to just print a newline][38469]
5543 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5544 * [Reduce the size of static data in `std_unicode::tables`][38781]
5545 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5546 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5548 * [`Duration` implements `Sum`][38712]
5549 * [`String` implements `ToSocketAddrs`][39048]
5554 * [The `cargo check` command does a type check of a project without
5555 building it][cargo/3296]
5556 * [crates.io will display CI badges from Travis and AppVeyor, if
5557 specified in Cargo.toml][cargo/3546]
5558 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5559 * [Compilation profiles accept integer values for `debug`, in addition
5560 to `true` and `false`. These are passed to `rustc` as the value to
5561 `-C debuginfo`][cargo/3534]
5562 * [Implement `cargo --version --verbose`][cargo/3604]
5563 * [All builds now output 'dep-info' build dependencies compatible with
5564 make and ninja][cargo/3557]
5565 * [Build all workspace members with `build --all`][cargo/3511]
5566 * [Document all workspace members with `doc --all`][cargo/3515]
5567 * [Path deps outside workspace are not members][cargo/3443]
5572 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5573 the path to the Rust implementation][38589]
5574 * [The `armv7-linux-androideabi` target no longer enables NEON
5575 extensions, per Google's ABI guide][38413]
5576 * [The stock standard library can be compiled for Redox OS][38401]
5577 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5579 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5581 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5586 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5587 match patterns][38069]
5588 * In this release, references to uninhabited types can not be
5589 pattern-matched. This was accidentally allowed in 1.15.
5590 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5591 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5593 * [Clean up semantics of `self` in an import list][38313]
5594 * Reimplemented lifetime elision. This change was almost entirely compatible
5595 with existing code, but it did close a number of small bugs and loopholes,
5596 as well as being more accepting in some other [cases][41105].
5598 [37057]: https://github.com/rust-lang/rust/pull/37057
5599 [37761]: https://github.com/rust-lang/rust/pull/37761
5600 [38006]: https://github.com/rust-lang/rust/pull/38006
5601 [38051]: https://github.com/rust-lang/rust/pull/38051
5602 [38062]: https://github.com/rust-lang/rust/pull/38062
5603 [38062]: https://github.com/rust-lang/rust/pull/38622
5604 [38066]: https://github.com/rust-lang/rust/pull/38066
5605 [38069]: https://github.com/rust-lang/rust/pull/38069
5606 [38131]: https://github.com/rust-lang/rust/pull/38131
5607 [38154]: https://github.com/rust-lang/rust/pull/38154
5608 [38274]: https://github.com/rust-lang/rust/pull/38274
5609 [38304]: https://github.com/rust-lang/rust/pull/38304
5610 [38313]: https://github.com/rust-lang/rust/pull/38313
5611 [38314]: https://github.com/rust-lang/rust/pull/38314
5612 [38327]: https://github.com/rust-lang/rust/pull/38327
5613 [38401]: https://github.com/rust-lang/rust/pull/38401
5614 [38413]: https://github.com/rust-lang/rust/pull/38413
5615 [38469]: https://github.com/rust-lang/rust/pull/38469
5616 [38559]: https://github.com/rust-lang/rust/pull/38559
5617 [38571]: https://github.com/rust-lang/rust/pull/38571
5618 [38580]: https://github.com/rust-lang/rust/pull/38580
5619 [38589]: https://github.com/rust-lang/rust/pull/38589
5620 [38670]: https://github.com/rust-lang/rust/pull/38670
5621 [38712]: https://github.com/rust-lang/rust/pull/38712
5622 [38726]: https://github.com/rust-lang/rust/pull/38726
5623 [38781]: https://github.com/rust-lang/rust/pull/38781
5624 [38798]: https://github.com/rust-lang/rust/pull/38798
5625 [38909]: https://github.com/rust-lang/rust/pull/38909
5626 [38920]: https://github.com/rust-lang/rust/pull/38920
5627 [38927]: https://github.com/rust-lang/rust/pull/38927
5628 [39048]: https://github.com/rust-lang/rust/pull/39048
5629 [39282]: https://github.com/rust-lang/rust/pull/39282
5630 [39379]: https://github.com/rust-lang/rust/pull/39379
5631 [41105]: https://github.com/rust-lang/rust/issues/41105
5632 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5633 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5634 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5635 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5636 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5637 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5638 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5639 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5640 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5641 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5642 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5643 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5644 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5645 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5646 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5647 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5648 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5649 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5650 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5651 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5652 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5653 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5654 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5655 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5656 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5657 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5658 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5659 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5660 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5661 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5664 Version 1.15.1 (2017-02-09)
5665 ===========================
5667 * [Fix IntoIter::as_mut_slice's signature][39466]
5668 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5670 [39466]: https://github.com/rust-lang/rust/pull/39466
5671 [39523]: https://github.com/rust-lang/rust/pull/39523
5674 Version 1.15.0 (2017-02-02)
5675 ===========================
5680 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5681 stable. This allows popular code-generating crates like Serde and Diesel to
5682 work ergonomically. [RFC 1681].
5683 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5684 with curly braces][36868]. Part of [RFC 1506].
5685 * [A number of minor changes to name resolution have been activated][37127].
5686 They add up to more consistent semantics, allowing for future evolution of
5687 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5688 details of what is different. The breaking changes here have been transitioned
5689 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5690 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5692 * [`?Sized` can be used in `where` clauses][37791]
5693 * [There is now a limit on the size of monomorphized types and it can be
5694 modified with the `#![type_size_limit]` crate attribute, similarly to
5695 the `#![recursion_limit]` attribute][37789]
5700 * [On Windows, the compiler will apply dllimport attributes when linking to
5701 extern functions][37973]. Additional attributes and flags can control which
5702 library kind is linked and its name. [RFC 1717].
5703 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5704 * [The `--test` flag works with procedural macro crates][38107]
5705 * [Fix `extern "aapcs" fn` ABI][37814]
5706 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5707 * [The `format!` expander recognizes incorrect `printf` and shell-style
5708 formatting directives and suggests the correct format][37613].
5709 * [Only report one error for all unused imports in an import list][37456]
5711 Compiler Performance
5712 --------------------
5714 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5715 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5716 * [Don't clone in `UnificationTable::probe`][37848]
5717 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5718 * [Use small vectors in type walker][37760]
5719 * [Macro expansion performance was improved][37701]
5720 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5721 * [Replace FNV with a faster hash function][37229]
5726 * [`std::iter::Iterator::min_by`]
5727 * [`std::iter::Iterator::max_by`]
5728 * [`std::os::*::fs::FileExt`]
5729 * [`std::sync::atomic::Atomic*::get_mut`]
5730 * [`std::sync::atomic::Atomic*::into_inner`]
5731 * [`std::vec::IntoIter::as_slice`]
5732 * [`std::vec::IntoIter::as_mut_slice`]
5733 * [`std::sync::mpsc::Receiver::try_iter`]
5734 * [`std::os::unix::process::CommandExt::before_exec`]
5735 * [`std::rc::Rc::strong_count`]
5736 * [`std::rc::Rc::weak_count`]
5737 * [`std::sync::Arc::strong_count`]
5738 * [`std::sync::Arc::weak_count`]
5739 * [`std::char::encode_utf8`]
5740 * [`std::char::encode_utf16`]
5741 * [`std::cell::Ref::clone`]
5742 * [`std::io::Take::into_inner`]
5747 * [The standard sorting algorithm has been rewritten for dramatic performance
5748 improvements][38192]. It is a hybrid merge sort, drawing influences from
5749 Timsort. Previously it was a naive merge sort.
5750 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5751 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5753 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5754 and `char_indices().last()`][37882]
5755 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5756 * [Chinese characters display correctly in `fmt::Debug`][37855]
5757 * [Derive `Default` for `Duration`][37699]
5758 * [Support creation of anonymous pipes on WinXP/2k][37677]
5759 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5760 * [Don't pass overlapped handles to processes][38835]
5765 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5766 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5767 should instead check the variable at runtime with `std::env`. That the value
5768 was set at build time was a bug, and incorrect when cross-compiling. This
5769 change is known to cause breakage.
5770 * [Add `--all` flag to `cargo test`][cargo/3221]
5771 * [Compile statically against the MSVC CRT][cargo/3363]
5772 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5773 * [Link OpenSSL statically on OSX][cargo/3311]
5774 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5775 * [Test for bad path overrides with summaries][cargo/3336]
5776 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5777 * [Fix retrying crate downloads for network errors][cargo/3348]
5778 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5779 * [Emit more info on --message-format=json][cargo/3319]
5780 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5781 * [Don't ignore errors in workspace manifest][cargo/3409]
5782 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5787 * [Test runners (binaries built with `--test`) now support a `--list` argument
5788 that lists the tests it contains][38185]
5789 * [Test runners now support a `--exact` argument that makes the test filter
5790 match exactly, instead of matching only a substring of the test name][38181]
5791 * [rustdoc supports a `--playground-url` flag][37763]
5792 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5797 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5798 continue to be used in this release by passing `--disable-rustbuild` to the
5799 configure script, but they will be deleted soon. Note that the new build
5800 system uses a different on-disk layout that will likely affect any scripts
5802 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5804 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5805 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5811 * [A number of minor changes to name resolution have been activated][37127].
5812 They add up to more consistent semantics, allowing for future evolution of
5813 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5814 details of what is different. The breaking changes here have been transitioned
5815 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5816 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5817 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5818 should instead check the variable at runtime with `std::env`. That the value
5819 was set at build time was a bug, and incorrect when cross-compiling. This
5820 change is known to cause breakage.
5821 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5822 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5823 1.10 and is now an error by default. It will become a hard error in the near
5825 * [The semantics relating modules to file system directories are changing in
5826 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5827 lint, which is a warning in this release, and will become a hard error in the
5829 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5830 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5831 the underlying iterator][37834]
5833 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5834 [33685]: https://github.com/rust-lang/rust/issues/33685
5835 [36868]: https://github.com/rust-lang/rust/pull/36868
5836 [37127]: https://github.com/rust-lang/rust/pull/37127
5837 [37229]: https://github.com/rust-lang/rust/pull/37229
5838 [37456]: https://github.com/rust-lang/rust/pull/37456
5839 [37527]: https://github.com/rust-lang/rust/pull/37527
5840 [37602]: https://github.com/rust-lang/rust/pull/37602
5841 [37613]: https://github.com/rust-lang/rust/pull/37613
5842 [37615]: https://github.com/rust-lang/rust/pull/37615
5843 [37636]: https://github.com/rust-lang/rust/pull/37636
5844 [37627]: https://github.com/rust-lang/rust/pull/37627
5845 [37642]: https://github.com/rust-lang/rust/pull/37642
5846 [37677]: https://github.com/rust-lang/rust/pull/37677
5847 [37699]: https://github.com/rust-lang/rust/pull/37699
5848 [37701]: https://github.com/rust-lang/rust/pull/37701
5849 [37705]: https://github.com/rust-lang/rust/pull/37705
5850 [37749]: https://github.com/rust-lang/rust/pull/37749
5851 [37760]: https://github.com/rust-lang/rust/pull/37760
5852 [37763]: https://github.com/rust-lang/rust/pull/37763
5853 [37764]: https://github.com/rust-lang/rust/pull/37764
5854 [37789]: https://github.com/rust-lang/rust/pull/37789
5855 [37791]: https://github.com/rust-lang/rust/pull/37791
5856 [37814]: https://github.com/rust-lang/rust/pull/37814
5857 [37817]: https://github.com/rust-lang/rust/pull/37817
5858 [37834]: https://github.com/rust-lang/rust/pull/37834
5859 [37848]: https://github.com/rust-lang/rust/pull/37848
5860 [37855]: https://github.com/rust-lang/rust/pull/37855
5861 [37882]: https://github.com/rust-lang/rust/pull/37882
5862 [37888]: https://github.com/rust-lang/rust/pull/37888
5863 [37973]: https://github.com/rust-lang/rust/pull/37973
5864 [37979]: https://github.com/rust-lang/rust/pull/37979
5865 [38086]: https://github.com/rust-lang/rust/pull/38086
5866 [38107]: https://github.com/rust-lang/rust/pull/38107
5867 [38117]: https://github.com/rust-lang/rust/pull/38117
5868 [38134]: https://github.com/rust-lang/rust/pull/38134
5869 [38146]: https://github.com/rust-lang/rust/pull/38146
5870 [38181]: https://github.com/rust-lang/rust/pull/38181
5871 [38182]: https://github.com/rust-lang/rust/pull/38182
5872 [38185]: https://github.com/rust-lang/rust/pull/38185
5873 [38192]: https://github.com/rust-lang/rust/pull/38192
5874 [38279]: https://github.com/rust-lang/rust/pull/38279
5875 [38835]: https://github.com/rust-lang/rust/pull/38835
5876 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5877 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5878 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5879 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5880 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5881 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5882 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5883 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5884 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5885 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5886 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5887 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5888 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5889 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5890 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5891 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5892 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5893 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5894 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5895 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5896 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5897 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5898 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5899 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5900 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5901 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5902 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5903 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5904 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5905 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5906 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5907 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5908 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5909 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5910 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5911 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5912 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5913 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5916 Version 1.14.0 (2016-12-22)
5917 ===========================
5922 * [`..` matches multiple tuple fields in enum variants, structs
5923 and tuples][36843]. [RFC 1492].
5924 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5925 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5926 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5927 dereferencing][36822]
5932 * [Mark enums with non-zero discriminant as non-zero][37224]
5933 * [Lower-case `static mut` names are linted like other
5934 statics and consts][37162]
5935 * [Fix ICE on some macros in const integer positions
5936 (e.g. `[u8; m!()]`)][36819]
5937 * [Improve error message and snippet for "did you mean `x`"][36798]
5938 * [Add a panic-strategy field to the target specification][36794]
5939 * [Include LLVM version in `--version --verbose`][37200]
5941 Compile-time Optimizations
5942 --------------------------
5944 * [Improve macro expansion performance][37569]
5945 * [Shrink `Expr_::ExprInlineAsm`][37445]
5946 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5947 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5948 * [Avoid more allocations when compiling html5ever][37373]
5949 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5950 * [Avoid some allocations in the macro parser][37318]
5951 * [Use a faster deflate setting][37298]
5952 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5953 during interning of slices][37270]
5954 * [Optimize `write_metadata`][37267]
5955 * [Don't process obligation forest cycles when stalled][37231]
5956 * [Avoid many `CrateConfig` clones][37161]
5957 * [Optimize `Substs::super_fold_with`][37108]
5958 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5959 * [Speed up `plug_leaks`][36917]
5964 * [`println!()`, with no arguments, prints newline][36825].
5965 Previously, an empty string was required to achieve the same.
5966 * [`Wrapping` impls standard binary and unary operators, as well as
5967 the `Sum` and `Product` iterators][37356]
5968 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5970 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5971 `VecDeque` iterators][37315]
5972 * [Improve `SipHasher` performance on small values][37312]
5973 * [Add Iterator trait TrustedLen to enable better FromIterator /
5975 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5976 * [`ReadDir` implements `Debug`][37221]
5977 * [Implement `RefUnwindSafe` for atomic types][37178]
5978 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5979 * [Avoid allocations in `Decoder::read_str`][37064]
5980 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5981 * [Impl `Debug` for raw pointers to unsized data][36880]
5982 * [Don't reuse `HashMap` random seeds][37470]
5983 * [The internal memory layout of `HashMap` is more cache-friendly, for
5984 significant improvements in some operations][36692]
5985 * [`HashMap` uses less memory on 32-bit architectures][36595]
5986 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5991 * [Expose rustc cfg values to build scripts][cargo/3243]
5992 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5993 * [Fix passing --features when testing multiple packages][cargo/3280]
5994 * [Use a single profile set per workspace][cargo/3249]
5995 * [Load `replace` sections from lock files][cargo/3220]
5996 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6001 * [rustup is the recommended Rust installation method][1.14rustup]
6002 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6003 S390x. These are [tier 2] platforms and may have major defects. Follow the
6004 instructions on the website to install, or add the targets to an existing
6005 installation with `rustup target add`. The new target triples are:
6006 - `mips-unknown-linux-gnu`
6007 - `mipsel-unknown-linux-gnu`
6008 - `mips64-unknown-linux-gnuabi64`
6009 - `mips64el-unknown-linux-gnuabi64 `
6010 - `powerpc-unknown-linux-gnu`
6011 - `powerpc64-unknown-linux-gnu`
6012 - `powerpc64le-unknown-linux-gnu`
6013 - `s390x-unknown-linux-gnu `
6014 * This release includes target (std) builds for ARM Linux running MUSL
6015 libc. These are [tier 2] platforms and may have major defects. Add the
6016 following triples to an existing rustup installation with `rustup target add`:
6017 - `arm-unknown-linux-musleabi`
6018 - `arm-unknown-linux-musleabihf`
6019 - `armv7-unknown-linux-musleabihf`
6020 * This release includes [experimental support for WebAssembly][1.14wasm], via
6021 the `wasm32-unknown-emscripten` target. This target is known to have major
6022 defects. Please test, report, and fix.
6023 * rustup no longer installs documentation by default. Run `rustup
6024 component add rust-docs` to install.
6025 * [Fix line stepping in debugger][37310]
6026 * [Enable line number debuginfo in releases][37280]
6031 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6032 * [Add support for Fuchsia OS][37313]
6033 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6038 * [A number of forward-compatibility lints used by the compiler
6039 to gradually introduce language changes have been converted
6040 to deny by default][36894]:
6041 - ["use of inaccessible extern crate erroneously allowed"][36886]
6042 - ["type parameter default erroneously allowed in invalid location"][36887]
6043 - ["detects super or self keywords at the beginning of global path"][36888]
6044 - ["two overlapping inherent impls define an item with the same name
6045 were erroneously allowed"][36889]
6046 - ["floating-point constants cannot be used in patterns"][36890]
6047 - ["constants of struct or enum type can only be used in a pattern if
6048 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6049 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6050 * [Prohibit patterns in trait methods without bodies][37378]
6051 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6052 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6053 * [The `$crate` macro variable is accepted in fewer locations][37213]
6054 * [Impls specifying extra region requirements beyond the trait
6055 they implement are rejected][37167]
6056 * [Enums may not be unsized][37111]. Unsized enums are intended to
6057 work but never have. For now they are forbidden.
6058 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6060 [tier 2]: https://forge.rust-lang.org/platform-support.html
6061 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6062 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6063 [36430]: https://github.com/rust-lang/rust/pull/36430
6064 [36595]: https://github.com/rust-lang/rust/pull/36595
6065 [36595]: https://github.com/rust-lang/rust/pull/36595
6066 [36692]: https://github.com/rust-lang/rust/pull/36692
6067 [36767]: https://github.com/rust-lang/rust/pull/36767
6068 [36794]: https://github.com/rust-lang/rust/pull/36794
6069 [36798]: https://github.com/rust-lang/rust/pull/36798
6070 [36819]: https://github.com/rust-lang/rust/pull/36819
6071 [36822]: https://github.com/rust-lang/rust/pull/36822
6072 [36825]: https://github.com/rust-lang/rust/pull/36825
6073 [36843]: https://github.com/rust-lang/rust/pull/36843
6074 [36880]: https://github.com/rust-lang/rust/pull/36880
6075 [36886]: https://github.com/rust-lang/rust/issues/36886
6076 [36887]: https://github.com/rust-lang/rust/issues/36887
6077 [36888]: https://github.com/rust-lang/rust/issues/36888
6078 [36889]: https://github.com/rust-lang/rust/issues/36889
6079 [36890]: https://github.com/rust-lang/rust/issues/36890
6080 [36891]: https://github.com/rust-lang/rust/issues/36891
6081 [36892]: https://github.com/rust-lang/rust/issues/36892
6082 [36894]: https://github.com/rust-lang/rust/pull/36894
6083 [36917]: https://github.com/rust-lang/rust/pull/36917
6084 [36993]: https://github.com/rust-lang/rust/pull/36993
6085 [37037]: https://github.com/rust-lang/rust/pull/37037
6086 [37064]: https://github.com/rust-lang/rust/pull/37064
6087 [37094]: https://github.com/rust-lang/rust/pull/37094
6088 [37108]: https://github.com/rust-lang/rust/pull/37108
6089 [37111]: https://github.com/rust-lang/rust/pull/37111
6090 [37161]: https://github.com/rust-lang/rust/pull/37161
6091 [37162]: https://github.com/rust-lang/rust/pull/37162
6092 [37167]: https://github.com/rust-lang/rust/pull/37167
6093 [37178]: https://github.com/rust-lang/rust/pull/37178
6094 [37200]: https://github.com/rust-lang/rust/pull/37200
6095 [37213]: https://github.com/rust-lang/rust/pull/37213
6096 [37221]: https://github.com/rust-lang/rust/pull/37221
6097 [37224]: https://github.com/rust-lang/rust/pull/37224
6098 [37230]: https://github.com/rust-lang/rust/pull/37230
6099 [37231]: https://github.com/rust-lang/rust/pull/37231
6100 [37247]: https://github.com/rust-lang/rust/pull/37247
6101 [37267]: https://github.com/rust-lang/rust/pull/37267
6102 [37270]: https://github.com/rust-lang/rust/pull/37270
6103 [37273]: https://github.com/rust-lang/rust/pull/37273
6104 [37280]: https://github.com/rust-lang/rust/pull/37280
6105 [37298]: https://github.com/rust-lang/rust/pull/37298
6106 [37306]: https://github.com/rust-lang/rust/pull/37306
6107 [37310]: https://github.com/rust-lang/rust/pull/37310
6108 [37312]: https://github.com/rust-lang/rust/pull/37312
6109 [37313]: https://github.com/rust-lang/rust/pull/37313
6110 [37315]: https://github.com/rust-lang/rust/pull/37315
6111 [37318]: https://github.com/rust-lang/rust/pull/37318
6112 [37322]: https://github.com/rust-lang/rust/pull/37322
6113 [37326]: https://github.com/rust-lang/rust/pull/37326
6114 [37351]: https://github.com/rust-lang/rust/pull/37351
6115 [37356]: https://github.com/rust-lang/rust/pull/37356
6116 [37367]: https://github.com/rust-lang/rust/pull/37367
6117 [37373]: https://github.com/rust-lang/rust/pull/37373
6118 [37378]: https://github.com/rust-lang/rust/pull/37378
6119 [37389]: https://github.com/rust-lang/rust/pull/37389
6120 [37392]: https://github.com/rust-lang/rust/pull/37392
6121 [37427]: https://github.com/rust-lang/rust/pull/37427
6122 [37439]: https://github.com/rust-lang/rust/pull/37439
6123 [37445]: https://github.com/rust-lang/rust/pull/37445
6124 [37470]: https://github.com/rust-lang/rust/pull/37470
6125 [37569]: https://github.com/rust-lang/rust/pull/37569
6126 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6127 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6128 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6129 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6130 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6131 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6132 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6135 Version 1.13.0 (2016-11-10)
6136 ===========================
6141 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6142 errors, like the `try!` macro, described in [RFC 0243].
6143 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6144 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6145 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6146 * [Fix lifetime rules for 'if' conditions][36029]
6147 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6152 * [Add the `-C link-arg` argument][36574]
6153 * [Remove the old AST-based backend from rustc_trans][35764]
6154 * [Don't enable NEON by default on armv7 Linux][35814]
6155 * [Fix debug line number info for macro expansions][35238]
6156 * [Do not emit "class method" debuginfo for types that are not
6157 DICompositeType][36008]
6158 * [Warn about multiple conflicting #[repr] hints][34623]
6159 * [When sizing DST, don't double-count nested struct prefixes][36351]
6160 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6161 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6162 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6163 * [Expand macros without recursing to avoid stack overflows][36214]
6168 * [Replace macro backtraces with labeled local uses][35702]
6169 * [Improve error message for misplaced doc comments][33922]
6170 * [Buffer unix and lock windows to prevent message interleaving][35975]
6171 * [Update lifetime errors to specifically note temporaries][36171]
6172 * [Special case a few colors for Windows][36178]
6173 * [Suggest `use self` when such an import resolves][36289]
6174 * [Be more specific when type parameter shadows primitive type][36338]
6175 * Many minor improvements
6177 Compile-time Optimizations
6178 --------------------------
6180 * [Compute and cache HIR hashes at beginning][35854]
6181 * [Don't hash types in loan paths][36004]
6182 * [Cache projections in trans][35761]
6183 * [Optimize the parser's last token handling][36527]
6184 * [Only instantiate #[inline] functions in codegen units referencing
6185 them][36524]. This leads to big improvements in cases where crates export
6186 define many inline functions without using them directly.
6187 * [Lazily allocate TypedArena's first chunk][36592]
6188 * [Don't allocate during default HashSet creation][36734]
6195 * [`overflowing_abs`]
6196 * [`RefCell::try_borrow`]
6197 * [`RefCell::try_borrow_mut`]
6202 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6203 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6205 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6206 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6207 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6208 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6209 * [Use arc4rand on FreeBSD][35884]
6210 * [memrchr: Correct aligned offset computation][35969]
6211 * [Improve Demangling of Rust Symbols][36059]
6212 * [Use monotonic time in condition variables][35048]
6213 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6214 * [Implement conversion traits for `char`][35755]
6215 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6216 * [Zero first byte of CString on drop][36264]
6217 * [Inherit overflow checks for sum and product][36372]
6218 * [Add missing Eq implementations][36423]
6219 * [Implement `Debug` for `DirEntry`][36631]
6220 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6222 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6223 * [Implement more traits for `std::io::ErrorKind`][35911]
6224 * [Optimize BinaryHeap bounds checking][36072]
6225 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6226 `extend_with_element`][36355]
6227 * [Fix overflow checking in unsigned pow()][34942]
6232 * This release includes security fixes to both curl and OpenSSL.
6233 * [Fix transitive doctests when panic=abort][cargo/3021]
6234 * [Add --all-features flag to cargo][cargo/3038]
6235 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6236 * [Don't parse the home directory more than once][cargo/3078]
6237 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6238 * [Update OpenSSL to 1.0.2j][cargo/3121]
6239 * [Add license and license_file to cargo metadata output][cargo/3110]
6240 * [Make crates-io registry URL optional in config; ignore all changes to
6241 source.crates-io][cargo/3089]
6242 * [Don't download dependencies from other platforms][cargo/3123]
6243 * [Build transitive dev-dependencies when needed][cargo/3125]
6244 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6245 * [Avoid updating registry when adding existing deps][cargo/3144]
6246 * [Warn about path overrides that won't work][cargo/3136]
6247 * [Use workspaces during `cargo install`][cargo/3146]
6248 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6249 * [Add --message-format flag][cargo/3000]
6250 * [Pass target environment for rustdoc][cargo/3205]
6251 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6252 * [Update curl and curl-sys][cargo/3241]
6253 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6258 * [rustdoc: Add the `--sysroot` argument][36586]
6259 * [rustdoc: Fix a couple of issues with the search results][35655]
6260 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6261 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6262 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6267 * [Remove unmaintained style guide][35124]
6268 * [Add s390x support][36369]
6269 * [Initial work at Haiku OS support][36727]
6270 * [Add mips-uclibc targets][35734]
6271 * [Crate-ify compiler-rt into compiler-builtins][35021]
6272 * [Add rustc version info (git hash + date) to dist tarball][36213]
6273 * Many documentation improvements
6278 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6279 * [Deny (by default) transmuting from fn item types to pointer-sized
6280 types][34923]. Continuing the long transition to zero-sized fn items,
6282 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6284 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6285 * [Fix lifetime rules for 'if' conditions][36029].
6286 * [Inherit overflow checks for sum and product][36372].
6287 * [Forbid user-defined macros named "macro_rules"][36730].
6289 [33922]: https://github.com/rust-lang/rust/pull/33922
6290 [34623]: https://github.com/rust-lang/rust/pull/34623
6291 [34923]: https://github.com/rust-lang/rust/pull/34923
6292 [34942]: https://github.com/rust-lang/rust/pull/34942
6293 [34982]: https://github.com/rust-lang/rust/pull/34982
6294 [35021]: https://github.com/rust-lang/rust/pull/35021
6295 [35048]: https://github.com/rust-lang/rust/pull/35048
6296 [35074]: https://github.com/rust-lang/rust/pull/35074
6297 [35124]: https://github.com/rust-lang/rust/pull/35124
6298 [35234]: https://github.com/rust-lang/rust/pull/35234
6299 [35238]: https://github.com/rust-lang/rust/pull/35238
6300 [35354]: https://github.com/rust-lang/rust/pull/35354
6301 [35559]: https://github.com/rust-lang/rust/pull/35559
6302 [35585]: https://github.com/rust-lang/rust/pull/35585
6303 [35627]: https://github.com/rust-lang/rust/pull/35627
6304 [35655]: https://github.com/rust-lang/rust/pull/35655
6305 [35702]: https://github.com/rust-lang/rust/pull/35702
6306 [35707]: https://github.com/rust-lang/rust/pull/35707
6307 [35728]: https://github.com/rust-lang/rust/pull/35728
6308 [35734]: https://github.com/rust-lang/rust/pull/35734
6309 [35755]: https://github.com/rust-lang/rust/pull/35755
6310 [35761]: https://github.com/rust-lang/rust/pull/35761
6311 [35764]: https://github.com/rust-lang/rust/pull/35764
6312 [35814]: https://github.com/rust-lang/rust/pull/35814
6313 [35854]: https://github.com/rust-lang/rust/pull/35854
6314 [35871]: https://github.com/rust-lang/rust/pull/35871
6315 [35884]: https://github.com/rust-lang/rust/pull/35884
6316 [35911]: https://github.com/rust-lang/rust/pull/35911
6317 [35969]: https://github.com/rust-lang/rust/pull/35969
6318 [35975]: https://github.com/rust-lang/rust/pull/35975
6319 [36004]: https://github.com/rust-lang/rust/pull/36004
6320 [36008]: https://github.com/rust-lang/rust/pull/36008
6321 [36014]: https://github.com/rust-lang/rust/pull/36014
6322 [36029]: https://github.com/rust-lang/rust/pull/36029
6323 [36059]: https://github.com/rust-lang/rust/pull/36059
6324 [36072]: https://github.com/rust-lang/rust/pull/36072
6325 [36101]: https://github.com/rust-lang/rust/pull/36101
6326 [36104]: https://github.com/rust-lang/rust/pull/36104
6327 [36171]: https://github.com/rust-lang/rust/pull/36171
6328 [36173]: https://github.com/rust-lang/rust/pull/36173
6329 [36178]: https://github.com/rust-lang/rust/pull/36178
6330 [36213]: https://github.com/rust-lang/rust/pull/36213
6331 [36214]: https://github.com/rust-lang/rust/pull/36214
6332 [36264]: https://github.com/rust-lang/rust/pull/36264
6333 [36266]: https://github.com/rust-lang/rust/pull/36266
6334 [36289]: https://github.com/rust-lang/rust/pull/36289
6335 [36338]: https://github.com/rust-lang/rust/pull/36338
6336 [36351]: https://github.com/rust-lang/rust/pull/36351
6337 [36355]: https://github.com/rust-lang/rust/pull/36355
6338 [36369]: https://github.com/rust-lang/rust/pull/36369
6339 [36372]: https://github.com/rust-lang/rust/pull/36372
6340 [36423]: https://github.com/rust-lang/rust/pull/36423
6341 [36482]: https://github.com/rust-lang/rust/pull/36482
6342 [36505]: https://github.com/rust-lang/rust/pull/36505
6343 [36524]: https://github.com/rust-lang/rust/pull/36524
6344 [36527]: https://github.com/rust-lang/rust/pull/36527
6345 [36551]: https://github.com/rust-lang/rust/pull/36551
6346 [36574]: https://github.com/rust-lang/rust/pull/36574
6347 [36586]: https://github.com/rust-lang/rust/pull/36586
6348 [36592]: https://github.com/rust-lang/rust/pull/36592
6349 [36631]: https://github.com/rust-lang/rust/pull/36631
6350 [36639]: https://github.com/rust-lang/rust/pull/36639
6351 [36721]: https://github.com/rust-lang/rust/pull/36721
6352 [36727]: https://github.com/rust-lang/rust/pull/36727
6353 [36730]: https://github.com/rust-lang/rust/pull/36730
6354 [36734]: https://github.com/rust-lang/rust/pull/36734
6355 [36754]: https://github.com/rust-lang/rust/pull/36754
6356 [36995]: https://github.com/rust-lang/rust/pull/36995
6357 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6358 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6359 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6360 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6361 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6362 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6363 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6364 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6365 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6366 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6367 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6368 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6369 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6370 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6371 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6372 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6373 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6374 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6375 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6376 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6377 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6378 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6379 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6380 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6381 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6382 [rustup]: https://www.rustup.rs
6383 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6384 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6385 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6386 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6387 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6388 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6389 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6392 Version 1.12.1 (2016-10-20)
6393 ===========================
6398 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6399 * [Confusion with double negation and booleans][36856]
6400 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6401 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6402 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6403 * [Corrupted memory after updated to 1.12][36936]
6404 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6405 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6406 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6408 [36381]: https://github.com/rust-lang/rust/issues/36381
6409 [36856]: https://github.com/rust-lang/rust/issues/36856
6410 [36875]: https://github.com/rust-lang/rust/issues/36875
6411 [36924]: https://github.com/rust-lang/rust/issues/36924
6412 [36926]: https://github.com/rust-lang/rust/issues/36926
6413 [36936]: https://github.com/rust-lang/rust/issues/36936
6414 [37026]: https://github.com/rust-lang/rust/issues/37026
6415 [37112]: https://github.com/rust-lang/rust/issues/37112
6416 [37153]: https://github.com/rust-lang/rust/issues/37153
6419 Version 1.12.0 (2016-09-29)
6420 ===========================
6425 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6426 This translation pass is far simpler than the previous AST->LLVM pass, and
6427 creates opportunities to perform new optimizations directly on the MIR. It
6428 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6429 * [`rustc` presents a new, more readable error format, along with
6430 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6431 Most common editors supporting Rust have been updated to work with it. It was
6432 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6437 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6438 This translation pass is far simpler than the previous AST->LLVM pass, and
6439 creates opportunities to perform new optimizations directly on the MIR. It
6440 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6441 * [Print the Rust target name, not the LLVM target name, with
6442 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6443 * [The computation of `TypeId` is correct in some cases where it was previously
6444 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6445 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6446 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6447 `--print relocation-models`, and `--print code-models` print the available
6448 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6449 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6450 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6451 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6452 These targets produce statically-linked binaries. There are no binary release
6458 * [`rustc` presents a new, more readable error format, along with
6459 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6460 Most common editors supporting Rust have been updated to work with it. It was
6461 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6462 * [In error descriptions, references are now described in plain English,
6463 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6464 * [In error type descriptions, unknown numeric types are named `{integer}` or
6465 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6466 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6471 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6472 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6473 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6474 useful](https://github.com/rust-lang/rust/pull/34908)
6475 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6476 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6477 * [Semicolons are properly required as statement delimiters inside
6478 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6479 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6484 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6485 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6486 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6487 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6488 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6489 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6490 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6491 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6492 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6493 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6494 Both on Unix and Windows.
6495 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6496 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6497 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6498 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6499 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6500 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6501 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6502 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6507 * [The `format!` macro and friends now allow a single argument to be formatted
6508 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6509 * [The lifetime bounds on `[T]::binary_search_by` and
6510 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6511 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6512 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6513 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6514 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6515 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6516 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6517 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6518 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6519 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6520 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6521 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6522 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6523 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6524 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6525 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6526 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6527 * [`mpsc::sync_channel` `Receiver`s return any available message before
6528 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6529 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6530 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6535 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6536 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6537 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6538 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6539 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6540 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6541 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6542 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6543 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6544 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6545 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6546 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6547 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6548 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6549 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6550 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6555 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6556 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6561 * [Test binaries now support a `--test-threads` argument to specify the number
6562 of threads used to run tests, and which acts the same as the
6563 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6564 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6565 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6566 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6567 * [Rust releases now come with source packages that can be installed by rustup
6568 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6569 The resulting source code can be used by tools and IDES, located in the
6570 sysroot under `lib/rustlib/src`.
6575 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6576 * Many minor improvements to the documentation.
6577 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6582 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6583 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6584 * [When formatting strings, if "precision" is specified, the "fill",
6585 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6586 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6589 Version 1.11.0 (2016-08-18)
6590 ===========================
6595 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6596 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6597 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6598 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6603 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6604 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6605 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6606 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6607 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6608 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6609 (in libcore - previously stabilized in libstd)
6610 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6611 (in libcore - previously stabilized in libstd)
6612 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6613 (in libcore - previously stabilized in libstd)
6614 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6615 (in libcore - previously stabilized in libstd)
6616 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6617 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6618 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6619 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6624 * [The `thread_local!` macro supports multiple definitions in a single
6625 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6626 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6627 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6628 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6629 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6630 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6631 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6632 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6637 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6638 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6639 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6640 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6641 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6642 and `-vv` prints warnings for all crates.
6643 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6644 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6645 This provides room for expansion by arbitrary tools.
6646 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6647 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6648 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6649 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6650 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6651 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6652 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6657 * [Caching projections speeds up type check dramatically for some
6658 workloads](https://github.com/rust-lang/rust/pull/33816)
6659 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6660 This hasher is faster, but is believed to provide sufficient
6661 protection from collision attacks.
6662 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6667 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6668 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6669 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6670 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6671 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6676 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6677 * [When emitting debug info, rustc emits frame pointers for closures,
6678 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6679 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6680 * Many more errors have been given error codes and extended
6682 * API documentation continues to be improved, with many new examples
6687 * [rustc no longer hangs when dependencies recursively re-export
6688 submodules](https://github.com/rust-lang/rust/pull/34542)
6689 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6690 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6691 rewritten](https://github.com/rust-lang/rust/pull/33895)
6692 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6693 No targets use this yet, but it works toward AVR support.
6698 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6699 * [The new follow-set rules that place restrictions on `macro_rules!`
6700 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6701 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6702 and has been a warning since 1.10.
6703 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6704 This causes breakage in some corner cases.
6707 Version 1.10.0 (2016-07-07)
6708 ===========================
6713 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6714 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6715 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6716 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6717 * [`panic!` can be converted to a runtime abort with the
6718 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6719 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6720 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6721 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6722 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6723 Note that Cargo does not yet directly support cdylibs.
6728 * `os::windows::fs::OpenOptionsExt::access_mode`
6729 * `os::windows::fs::OpenOptionsExt::share_mode`
6730 * `os::windows::fs::OpenOptionsExt::custom_flags`
6731 * `os::windows::fs::OpenOptionsExt::attributes`
6732 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6733 * `os::unix::fs::OpenOptionsExt::custom_flags`
6734 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6735 * `Default for sync::Weak`
6736 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6737 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6738 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6739 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6740 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6741 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6742 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6743 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6744 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6745 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6746 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6747 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6748 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6749 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6750 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6751 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6752 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6753 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6754 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6755 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6756 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6757 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6758 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6759 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6760 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6761 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6762 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6763 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6764 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6765 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6766 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6767 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6768 * Read/Write/RawFd impls for `UnixStream`
6769 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6770 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6771 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6772 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6773 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6774 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6775 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6776 * RawFd impls for `UnixListener`
6777 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6778 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6779 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6780 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6781 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6782 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6783 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6784 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6785 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6786 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6787 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6788 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6789 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6790 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6791 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6792 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6793 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6794 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6795 * RawFd impls for `UnixDatagram`
6796 * `{BTree,Hash}Map::values_mut`
6797 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6802 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6803 The semantics of this minor method are subtle and probably not what
6805 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6806 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6807 will fall back to `/dev/urandom` temporarily to avoid blocking
6808 during early boot](https://github.com/rust-lang/rust/pull/33086).
6809 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6810 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6811 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6812 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6813 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6814 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6815 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6819 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6820 This controls the runtime behavior of the `panic!` macro
6821 and can be either "unwind" (the default), or "abort".
6822 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6823 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6824 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6825 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6826 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6827 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6828 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6829 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6830 By default they are retried twice, which can be customized with the
6831 `net.retry` value in `.cargo/config`.
6832 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6833 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6834 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6835 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6836 Makes it possible to install multiple crates in parallel.
6837 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6838 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6839 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6840 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6841 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6842 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6847 * [rustc memory usage was reduced by refactoring the context used for
6848 type checking](https://github.com/rust-lang/rust/pull/33425).
6849 * [Speed up creation of `HashMap`s by caching the random keys used
6850 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6851 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6852 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6853 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6854 10x faster than the previous lookup tables.
6855 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6860 * Many incremental improvements to documentation and rustdoc.
6861 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6862 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6863 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6864 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6865 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6866 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6867 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6872 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6873 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6874 * [`std` no longer prints backtraces on platforms where the running
6875 module must be loaded with `env::current_exe`, which can't be relied
6876 on](https://github.com/rust-lang/rust/pull/33554).
6877 * This release includes std binaries for the i586-unknown-linux-gnu,
6878 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6879 i586 target is for old x86 hardware without SSE2, and the armv7
6880 target is for Android running on modern ARM architectures.
6881 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6882 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6883 * [On Unix the runtime aborts by calling `libc::abort` instead of
6884 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6885 * [Rust is now bootstrapped from the previous release of Rust,
6886 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6891 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6892 * [`target_env` for Linux ARM targets is just `gnu`, not
6893 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6894 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6895 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6896 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6897 Affects how macros are parsed.
6898 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6899 * [Feature-gated attributes on macro-generated macro invocations are
6900 now rejected](https://github.com/rust-lang/rust/pull/32791).
6901 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6902 This caused some minor changes to type inference.
6905 Version 1.9.0 (2016-05-26)
6906 ==========================
6911 * The `#[deprecated]` attribute when applied to an API will generate
6912 warnings when used. The warnings may be suppressed with
6913 `#[allow(deprecated)]`. [RFC 1270].
6914 * [`fn` item types are zero sized, and each `fn` names a unique
6915 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6916 `transmute` on a `fn` type will generate a warning for a few cycles,
6917 then will be converted to an error.
6918 * [Field and method resolution understand visibility, so private
6919 fields and methods cannot prevent the proper use of public fields
6920 and methods][1.9fv].
6921 * [The parser considers unicode codepoints in the
6922 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6928 * [`std::panic::catch_unwind`] (renamed from `recover`)
6929 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6930 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6931 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6932 * [`str::is_char_boundary`]
6933 * [`<*const T>::as_ref`]
6934 * [`<*mut T>::as_ref`]
6935 * [`<*mut T>::as_mut`]
6936 * [`AsciiExt::make_ascii_uppercase`]
6937 * [`AsciiExt::make_ascii_lowercase`]
6938 * [`char::decode_utf16`]
6939 * [`char::DecodeUtf16`]
6940 * [`char::DecodeUtf16Error`]
6941 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6942 * [`BTreeSet::take`]
6943 * [`BTreeSet::replace`]
6946 * [`HashSet::replace`]
6948 * [`OsString::with_capacity`]
6949 * [`OsString::clear`]
6950 * [`OsString::capacity`]
6951 * [`OsString::reserve`]
6952 * [`OsString::reserve_exact`]
6953 * [`OsStr::is_empty`]
6955 * [`std::os::unix::thread`]
6958 * [`JoinHandleExt::as_pthread_t`]
6959 * [`JoinHandleExt::into_pthread_t`]
6960 * [`HashSet::hasher`]
6961 * [`HashMap::hasher`]
6962 * [`CommandExt::exec`]
6963 * [`File::try_clone`]
6964 * [`SocketAddr::set_ip`]
6965 * [`SocketAddr::set_port`]
6966 * [`SocketAddrV4::set_ip`]
6967 * [`SocketAddrV4::set_port`]
6968 * [`SocketAddrV6::set_ip`]
6969 * [`SocketAddrV6::set_port`]
6970 * [`SocketAddrV6::set_flowinfo`]
6971 * [`SocketAddrV6::set_scope_id`]
6972 * [`slice::copy_from_slice`]
6973 * [`ptr::read_volatile`]
6974 * [`ptr::write_volatile`]
6975 * [`OpenOptions::create_new`]
6976 * [`TcpStream::set_nodelay`]
6977 * [`TcpStream::nodelay`]
6978 * [`TcpStream::set_ttl`]
6979 * [`TcpStream::ttl`]
6980 * [`TcpStream::set_only_v6`]
6981 * [`TcpStream::only_v6`]
6982 * [`TcpStream::take_error`]
6983 * [`TcpStream::set_nonblocking`]
6984 * [`TcpListener::set_ttl`]
6985 * [`TcpListener::ttl`]
6986 * [`TcpListener::set_only_v6`]
6987 * [`TcpListener::only_v6`]
6988 * [`TcpListener::take_error`]
6989 * [`TcpListener::set_nonblocking`]
6990 * [`UdpSocket::set_broadcast`]
6991 * [`UdpSocket::broadcast`]
6992 * [`UdpSocket::set_multicast_loop_v4`]
6993 * [`UdpSocket::multicast_loop_v4`]
6994 * [`UdpSocket::set_multicast_ttl_v4`]
6995 * [`UdpSocket::multicast_ttl_v4`]
6996 * [`UdpSocket::set_multicast_loop_v6`]
6997 * [`UdpSocket::multicast_loop_v6`]
6998 * [`UdpSocket::set_multicast_ttl_v6`]
6999 * [`UdpSocket::multicast_ttl_v6`]
7000 * [`UdpSocket::set_ttl`]
7001 * [`UdpSocket::ttl`]
7002 * [`UdpSocket::set_only_v6`]
7003 * [`UdpSocket::only_v6`]
7004 * [`UdpSocket::join_multicast_v4`]
7005 * [`UdpSocket::join_multicast_v6`]
7006 * [`UdpSocket::leave_multicast_v4`]
7007 * [`UdpSocket::leave_multicast_v6`]
7008 * [`UdpSocket::take_error`]
7009 * [`UdpSocket::connect`]
7010 * [`UdpSocket::send`]
7011 * [`UdpSocket::recv`]
7012 * [`UdpSocket::set_nonblocking`]
7017 * [`std::sync::Once` is poisoned if its initialization function
7019 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7020 * [Most types implement `fmt::Debug`][1.9db].
7021 * [The default buffer size used by `BufReader` and `BufWriter` was
7022 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7023 used by other languages.
7024 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7025 `Duration` additionally implements `*=` and `/=`][1.9ta].
7026 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7027 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7028 * [`Chain` implements `BufRead`][1.9ch].
7029 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7034 * [Cargo can now run concurrently][1.9cc].
7035 * [Top-level overrides allow specific revisions of crates to be
7036 overridden through the entire crate graph][1.9ct]. This is intended
7037 to make upgrades easier for large projects, by allowing crates to be
7038 forked temporarily until they've been upgraded and republished.
7039 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7040 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7041 on the commandline][1.9cf]. `rustc` arguments can also be specified
7042 in the `build.rustflags` configuration key.
7047 * [The time complexity of comparing variables for equivalence during type
7048 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7049 to major compilation time improvement in some scenarios.
7050 * [`ToString` is specialized for `str`, giving it the same performance
7051 as `to_owned`][1.9ts].
7052 * [Spawning processes with `Command::output` no longer creates extra
7054 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7055 for C-like enums][1.9cl].
7060 * [Passing the `--quiet` flag to a test runner will produce
7061 much-abbreviated output][1.9q].
7062 * The Rust Project now publishes std binaries for the
7063 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7064 `i586-pc-windows-msvc` targets.
7069 * [`std::sync::Once` is poisoned if its initialization function
7071 * [It is illegal to define methods with the same name in overlapping
7072 inherent `impl` blocks][1.9sn].
7073 * [`fn` item types are zero sized, and each `fn` names a unique
7074 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7075 `transmute` on a `fn` type will generate a warning for a few cycles,
7076 then will be converted to an error.
7077 * [Improvements to const evaluation may trigger new errors when integer
7078 literals are out of range][1.9ce].
7081 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7082 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7083 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7084 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7085 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7086 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7087 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7088 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7089 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7090 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7091 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7092 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7093 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7094 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7095 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7096 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7097 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7098 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7099 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7100 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7101 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7102 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7103 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7104 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7105 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7106 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7107 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7108 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7109 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7110 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7111 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7112 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7113 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7114 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7115 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7116 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7117 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7118 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7119 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7120 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7121 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7122 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7123 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7124 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7125 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7126 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7127 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7128 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7129 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7130 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7131 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7132 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7133 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7134 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7135 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7136 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7137 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7138 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7139 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7140 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7141 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7142 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7143 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7144 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7145 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7146 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7147 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7148 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7149 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7150 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7151 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7152 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7153 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7154 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7155 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7156 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7157 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7158 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7159 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7160 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7161 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7162 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7163 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7164 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7165 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7166 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7167 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7168 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7169 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7170 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7171 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7172 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7173 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7174 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7175 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7176 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7177 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7178 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7179 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7180 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7181 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7182 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7183 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7184 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7185 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7186 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7187 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7188 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7189 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7190 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7193 Version 1.8.0 (2016-04-14)
7194 ==========================
7199 * Rust supports overloading of compound assignment statements like
7200 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7201 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7202 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7204 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7205 addition to the non-braced form, `struct Foo;`. [RFC 218].
7211 * [`str::encode_utf16`] (renamed from `utf16_units`)
7212 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7215 * [`ptr::drop_in_place`]
7217 * [`time::SystemTime`]
7219 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7220 * [`Instant::elapsed`]
7221 * [`SystemTime::now`]
7222 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7223 * [`SystemTime::elapsed`]
7224 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7225 * [`SystemTimeError`]
7226 * [`SystemTimeError::duration`]
7227 * Various impls for `SystemTimeError`
7229 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7230 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7231 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7232 * [The `write!` and `writeln!` macros correctly emit errors if any of
7233 their arguments can't be formatted][1.8w].
7234 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7235 * [The Unix-specific `raw` modules, which contain a number of
7236 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7237 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7238 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7239 across platforms was making it difficult to implement `std`
7240 correctly. Those that need these definitions should use the `libc`
7242 * The Unix-specific `MetadataExt` traits, including
7243 `os::unix::fs::MetadataExt`, which expose values such as inode
7244 numbers [no longer return platform-specific types][1.8r], but
7245 instead return widened integers. [RFC 1415].
7246 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7247 * [Atomic loads and stores are not volatile][1.8a].
7248 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7253 * [Inlining hash functions lead to a 3% compile-time improvement in
7254 some workloads][1.8h].
7255 * When using jemalloc, its symbols are [unprefixed so that it
7256 overrides the libc malloc implementation][1.8h]. This means that for
7257 rustc, LLVM is now using jemalloc, which results in a 6%
7258 compile-time improvement on a specific workload.
7259 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7264 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7265 i686-pc-windows-msvc is now considered a tier-1 platform.
7266 * [The `--print targets` flag prints a list of supported targets][1.8t].
7267 * [The `--print cfg` flag prints the `cfg`s defined for the current
7269 * [`rustc` can be built with an new Cargo-based build system, written
7270 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7271 build system. To enable it configure with `configure --rustbuild`.
7272 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7273 variants while also indicating the total number of missing variants
7274 if more than 3][1.8m].
7275 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7276 * The Rust Project now publishes binary releases of the standard
7277 library for a number of tier-2 targets:
7278 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7279 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7280 `x86_64-rumprun-netbsd`. These can be installed with
7281 tools such as [multirust][1.8mr].
7286 * [`cargo init` creates a new Cargo project in the current
7287 directory][1.8ci]. It is otherwise like `cargo new`.
7288 * [Cargo has configuration keys for `-v` and
7289 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7290 `[term]` section of `.cargo/config`.
7291 * [Configuration keys that evaluate to strings or integers can be set
7292 via environment variables][1.8ce]. For example the `build.jobs` key
7293 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7294 precedence over config files.
7295 * [Target-specific dependencies support Rust `cfg` syntax for
7296 describing targets][1.8cfg] so that dependencies for multiple
7297 targets can be specified together. [RFC 1361].
7298 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7299 `RUSTDOC` take precedence over the `build.target-dir`,
7300 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7301 * [The child process tree is killed on Windows when Cargo is
7303 * [The `build.target` configuration value sets the target platform,
7304 like `--target`][1.8ct].
7309 * [Unstable compiler flags have been further restricted][1.8u]. Since
7310 1.0 `-Z` flags have been considered unstable, and other flags that
7311 were considered unstable additionally required passing `-Z
7312 unstable-options` to access. Unlike unstable language and library
7313 features though, these options have been accessible on the stable
7314 release channel. Going forward, *new unstable flags will not be
7315 available on the stable release channel*, and old unstable flags
7316 will warn about their usage. In the future, all unstable flags will
7317 be unavailable on the stable release channel.
7318 * [It is no longer possible to `match` on empty enum variants using
7319 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7320 * The Unix-specific `MetadataExt` traits, including
7321 `os::unix::fs::MetadataExt`, which expose values such as inode
7322 numbers [no longer return platform-specific types][1.8r], but
7323 instead return widened integers. [RFC 1415].
7324 * [Modules sourced from the filesystem cannot appear within arbitrary
7325 blocks, but only within other modules][1.8mf].
7326 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7327 * On Unix, [stack overflow triggers a runtime abort instead of a
7329 * [`Command::spawn` and its equivalents return an error if any of
7330 its command-line arguments contain interior `NUL`s][1.8n].
7331 * [Tuple and unit enum variants from other crates are in the type
7333 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7334 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7335 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7336 instead of `foo.lib`.
7339 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7340 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7341 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7342 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7343 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7344 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7345 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7346 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7347 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7348 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7349 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7350 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7351 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7352 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7353 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7354 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7355 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7356 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7357 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7358 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7359 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7360 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7361 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7362 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7363 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7364 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7365 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7366 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7367 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7368 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7369 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7370 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7371 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7372 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7373 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7374 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7375 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7376 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7377 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7378 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7379 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7380 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7381 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7382 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7383 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7384 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7385 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7386 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7387 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7388 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7389 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7390 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7391 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7392 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7393 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7394 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7395 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7396 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7397 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7398 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7401 Version 1.7.0 (2016-03-03)
7402 ==========================
7409 * [`Path::strip_prefix`] (renamed from relative_from)
7410 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7412 * [`Ipv4Addr::is_loopback`]
7413 * [`Ipv4Addr::is_private`]
7414 * [`Ipv4Addr::is_link_local`]
7415 * [`Ipv4Addr::is_multicast`]
7416 * [`Ipv4Addr::is_broadcast`]
7417 * [`Ipv4Addr::is_documentation`]
7419 * [`Ipv6Addr::is_unspecified`]
7420 * [`Ipv6Addr::is_loopback`]
7421 * [`Ipv6Addr::is_multicast`]
7424 * [`Vec::as_mut_slice`]
7426 * [`String::as_str`]
7427 * [`String::as_mut_str`]
7429 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7431 * `<[T]>::`[`sort_by_key`]
7432 * checked, saturated, and overflowing operations
7433 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7434 * [`i32::saturating_mul`]
7435 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7436 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7437 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7438 * [`u32::saturating_mul`]
7439 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7440 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7441 * and checked, saturated, and overflowing operations for other primitive types
7443 * [`ffi::IntoStringError`]
7444 * [`CString::into_string`]
7445 * [`CString::into_bytes`]
7446 * [`CString::into_bytes_with_nul`]
7447 * `From<CString> for Vec<u8>`
7449 * [`IntoStringError::into_cstring`]
7450 * [`IntoStringError::utf8_error`]
7451 * `Error for IntoStringError`
7453 * [`std::hash::BuildHasher`]
7454 * [`BuildHasher::Hasher`]
7455 * [`BuildHasher::build_hasher`]
7456 * [`std::hash::BuildHasherDefault`]
7457 * [`HashMap::with_hasher`]
7458 * [`HashMap::with_capacity_and_hasher`]
7459 * [`HashSet::with_hasher`]
7460 * [`HashSet::with_capacity_and_hasher`]
7461 * [`std::collections::hash_map::RandomState`]
7462 * [`RandomState::new`]
7463 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7464 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7465 from bytes is faster.
7466 * [The performance of `LineWriter` (and thus `io::stdout`) was
7467 improved by using `memchr` to search for newlines][1.7m].
7468 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7469 `f64` variants were stabilized previously.
7470 * [`BTreeMap` was rewritten to use less memory and improve the performance
7471 of insertion and iteration, the latter by as much as 5x][1.7bm].
7472 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7473 covariant over their contained type][1.7bt].
7474 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7475 over their contained type][1.7ll].
7476 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7478 * [`Any` is implemented for unsized types][1.7a].
7479 * [`Hash` is implemented for `Duration`][1.7h].
7484 * [When running tests with `--test`, rustdoc will pass `--cfg`
7485 arguments to the compiler][1.7dt].
7486 * [The compiler is built with RPATH information by default][1.7rpa].
7487 This means that it will be possible to run `rustc` when installed in
7488 unusual configurations without configuring the dynamic linker search
7490 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7491 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7492 over `LD_LIBRARY_PATH`.
7497 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7498 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7499 * [The `rerun-if-changed` build script directive no longer causes the
7500 build script to incorrectly run twice in certain scenarios][1.7rr].
7505 * Soundness fixes to the interactions between associated types and
7506 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7507 code that violates the new rules. This is a significant change that
7508 is known to break existing code, so it has emitted warnings for the
7509 new error cases since 1.4 to give crate authors time to adapt. The
7510 details of what is changing are subtle; read the RFC for more.
7511 * [Several bugs in the compiler's visibility calculations were
7512 fixed][1.7v]. Since this was found to break significant amounts of
7513 code, the new errors will be emitted as warnings for several release
7514 cycles, under the `private_in_public` lint.
7515 * Defaulted type parameters were accidentally accepted in positions
7516 that were not intended. In this release, [defaulted type parameters
7517 appearing outside of type definitions will generate a
7518 warning][1.7d], which will become an error in future releases.
7519 * [Parsing "." as a float results in an error instead of 0][1.7p].
7520 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7521 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7523 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7524 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7525 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7526 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7527 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7528 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7529 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7530 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7531 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7532 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7533 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7534 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7535 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7536 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7537 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7538 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7539 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7540 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7541 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7542 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7543 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7544 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7545 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7546 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7547 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7548 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7549 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7550 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7551 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7552 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7553 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7554 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7555 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7556 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7557 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7558 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7559 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7560 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7561 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7562 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7563 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7564 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7565 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7566 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7567 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7568 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7569 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7570 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7571 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7572 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7573 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7574 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7575 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7576 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7577 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7578 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7579 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7580 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7581 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7582 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7583 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7584 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7585 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7586 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7587 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7588 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7589 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7590 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7591 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7592 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7593 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7594 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7595 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7596 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7597 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7598 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7599 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7600 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7601 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7604 Version 1.6.0 (2016-01-21)
7605 ==========================
7610 * The `#![no_std]` attribute causes a crate to not be linked to the
7611 standard library, but only the [core library][1.6co], as described
7612 in [RFC 1184]. The core library defines common types and traits but
7613 has no platform dependencies whatsoever, and is the basis for Rust
7614 software in environments that cannot support a full port of the
7615 standard library, such as operating systems. Most of the core
7616 library is now stable.
7622 [`Read::read_exact`],
7623 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7624 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7625 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7626 [`os::unix::fs::DirBuilderExt`],
7627 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7628 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7629 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7630 [`collections::hash_map::Drain`],
7631 [`collections::hash_map::HashMap::drain`],
7632 [`collections::hash_set::Drain`],
7633 [`collections::hash_set::HashSet::drain`],
7634 [`collections::binary_heap::Drain`],
7635 [`collections::binary_heap::BinaryHeap::drain`],
7636 [`Vec::extend_from_slice`] (renamed from `push_all`),
7637 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7638 [`RwLock::into_inner`],
7639 [`Iterator::min_by_key`] (renamed from `min_by`),
7640 [`Iterator::max_by_key`] (renamed from `max_by`).
7641 * The [core library][1.6co] is stable, as are most of its APIs.
7642 * [The `assert_eq!` macro supports arguments that don't implement
7643 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7645 * Several timer functions that take duration in milliseconds [are
7646 deprecated in favor of those that take `Duration`][1.6ms]. These
7647 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7648 `thread::park_timeout_ms`.
7649 * The algorithm by which `Vec` reserves additional elements was
7650 [tweaked to not allocate excessive space][1.6a] while still growing
7652 * `From` conversions are [implemented from integers to floats][1.6f]
7653 in cases where the conversion is lossless. Thus they are not
7654 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7655 or `f64`. They are also not implemented for `isize` and `usize`
7656 because the implementations would be platform-specific. `From` is
7657 also implemented from `f32` to `f64`.
7658 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7659 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7660 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7661 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7663 * Sorting slices that are already sorted [is 50% faster in some
7669 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7670 * Cargo build scripts can specify their dependencies by emitting the
7671 [`rerun-if-changed`][1.6rr] key.
7672 * crates.io will reject publication of crates with dependencies that
7673 have a wildcard version constraint. Crates with wildcard
7674 dependencies were seen to cause a variety of problems, as described
7675 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7677 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7678 release folder. A variety of artifacts that Cargo failed to clean
7679 are now correctly deleted.
7684 * The `unreachable_code` lint [warns when a function call's argument
7686 * The parser indicates [failures that may be caused by
7687 confusingly-similar Unicode characters][1.6uc]
7688 * Certain macro errors [are reported at definition time][1.6m], not
7694 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7695 environment variable when locating crates. This was a pre-cargo
7696 feature for integrating with the package manager that was
7697 accidentally never removed.
7698 * [A number of bugs were fixed in the privacy checker][1.6p] that
7699 could cause previously-accepted code to break.
7700 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7701 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7702 struct pattern syntax (`Foo(..)`) can no longer be used to match
7703 unit structs. This is a warning now, but will become an error in
7704 future releases. Patterns that share the same name as a const are
7706 * A bug was fixed that causes [rustc not to apply default type
7707 parameters][1.6xc] when resolving certain method implementations of
7708 traits defined in other crates.
7710 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7711 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7712 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7713 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7714 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7715 [1.6co]: http://doc.rust-lang.org/core/index.html
7716 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7717 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7718 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7719 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7720 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7721 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7722 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7723 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7724 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7725 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7726 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7727 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7728 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7729 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7730 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7731 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7732 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7733 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7734 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7735 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7736 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7737 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7738 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7739 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7740 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7741 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7742 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7743 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7744 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7745 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7746 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7747 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7748 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7749 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7750 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7751 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7752 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7753 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7754 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7755 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7756 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7759 Version 1.5.0 (2015-12-10)
7760 ==========================
7762 * ~700 changes, numerous bugfixes
7768 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7769 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7770 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7771 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7772 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7773 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7774 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7775 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7776 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7777 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7778 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7779 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7780 [`Path::read_link`], [`Path::symlink_metadata`],
7781 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7782 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7783 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7784 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7785 [`slice::split_first_mut`], [`slice::split_first`],
7786 [`slice::split_last_mut`], [`slice::split_last`],
7787 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7788 [`str::MatchIndices`], [`str::RMatchIndices`],
7789 [`str::match_indices`], [`str::rmatch_indices`],
7790 [`str::slice_mut_unchecked`], [`string::ParseError`].
7791 * Rust applications hosted on crates.io can be installed locally to
7792 `~/.cargo/bin` with the [`cargo install`] command. Among other
7793 things this makes it easier to augment Cargo with new subcommands:
7794 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7795 invoked as `cargo foo`.
7796 * Crates with wildcard (`*`) dependencies will [emit warnings when
7797 published][1.5w]. In 1.6 it will no longer be possible to publish
7798 crates with wildcard dependencies.
7803 * The rules determining when a particular lifetime must outlive
7804 a particular value (known as '[dropck]') have been [modified
7805 to not rely on parametricity][1.5p].
7806 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7807 and `Arc`][1.5a]. Because these smart pointer types implement
7808 `Deref`, this causes breakage in cases where the interior type
7809 contains methods of the same name.
7810 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7811 that they could drop their content. Soundness fix.
7812 * All method invocations are [properly checked][1.5wf1] for
7813 [well-formedness][1.5wf2]. Soundness fix.
7814 * Traits whose supertraits contain `Self` are [not object
7815 safe][1.5o]. Soundness fix.
7816 * Target specifications support a [`no_default_libraries`][1.5nd]
7817 setting that controls whether `-nodefaultlibs` is passed to the
7818 linker, and in turn the `is_like_windows` setting no longer affects
7819 the `-nodefaultlibs` flag.
7820 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7821 * The `#[inline]` and `#[repr]` attributes [can only appear
7822 in valid locations][1.5at].
7823 * Native libraries linked from the local crate are [passed to
7824 the linker before native libraries from upstream crates][1.5nl].
7825 * Two rarely-used attributes, `#[no_debug]` and
7826 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7827 * Negation of unsigned integers, which has been a warning for
7828 several releases, [is now behind a feature gate and will
7829 generate errors][1.5nu].
7830 * The parser accidentally accepted visibility modifiers on
7831 enum variants, a bug [which has been fixed][1.5ev].
7832 * [A bug was fixed that allowed `use` statements to import unstable
7838 * When evaluating expressions at compile-time that are not
7839 compile-time constants (const-evaluating expressions in non-const
7840 contexts), incorrect code such as overlong bitshifts and arithmetic
7841 overflow will [generate a warning instead of an error][1.5ce],
7842 delaying the error until runtime. This will allow the
7843 const-evaluator to be expanded in the future backwards-compatibly.
7844 * The `improper_ctypes` lint [no longer warns about using `isize` and
7845 `usize` in FFI][1.5ict].
7850 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7852 * `Default` is [implemented for mutable slices][1.5d].
7853 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7854 * There are now `From` conversions [between floating point
7855 types][1.5f] where the conversions are lossless.
7856 * There are now `From` conversions [between integer types][1.5i] where
7857 the conversions are lossless.
7858 * [`fs::Metadata` implements `Clone`][1.5fs].
7859 * The `parse` method [accepts a leading "+" when parsing
7861 * [`AsMut` is implemented for `Vec`][1.5am].
7862 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7863 been optimized][1.5cf] and no longer rely on the default impl.
7864 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7865 `unsafe extern "C"` function types now [implement `Clone`,
7866 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7867 `fmt::Debug` for up to 12 arguments][1.5fp].
7868 * [Dropping `Vec`s is much faster in unoptimized builds when the
7869 element types don't implement `Drop`][1.5dv].
7870 * A bug that caused in incorrect behavior when [combining `VecDeque`
7871 with zero-sized types][1.5vdz] was resolved.
7872 * [`PartialOrd` for slices is faster][1.5po].
7877 * [Crate metadata size was reduced by 20%][1.5md].
7878 * [Improvements to code generation reduced the size of libcore by 3.3
7879 MB and rustc's memory usage by 18MB][1.5m].
7880 * [Improvements to deref translation increased performance in
7881 unoptimized builds][1.5dr].
7882 * Various errors in trait resolution [are deduplicated to only be
7883 reported once][1.5te].
7884 * Rust has preliminary [support for rumprun kernels][1.5rr].
7885 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7887 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7888 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7889 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7890 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7891 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7892 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7893 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7894 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7895 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7896 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7897 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7898 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7899 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7900 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7901 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7902 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7903 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7904 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7905 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7906 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7907 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7908 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7909 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7910 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7911 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7912 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7913 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7914 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7915 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7916 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7917 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7918 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7919 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7920 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7921 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7922 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7923 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7924 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7925 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7926 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7927 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7928 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7929 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7930 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7931 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7932 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7933 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7934 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7935 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7936 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7937 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7938 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7939 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7940 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7941 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7942 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7943 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7944 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7945 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7946 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7947 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7948 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7949 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7950 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7951 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7952 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7953 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7954 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7955 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7956 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7957 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7958 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7959 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7960 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7961 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7962 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7963 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7964 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7965 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7966 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7967 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7968 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7969 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7970 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7971 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7972 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7973 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7974 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7975 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7977 Version 1.4.0 (2015-10-29)
7978 ==========================
7980 * ~1200 changes, numerous bugfixes
7985 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7986 GNU) are now supported and recommended for use.
7991 * [Several changes have been made to fix type soundness and improve
7992 the behavior of associated types][sound]. See [RFC 1214]. Although
7993 we have mostly introduced these changes as warnings this release, to
7994 become errors next release, there are still some scenarios that will
7995 see immediate breakage.
7996 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7997 line breaks in addition to `\n`][crlf].
7998 * [Loans of `'static` lifetime extend to the end of a function][stat].
7999 * [`str::parse` no longer introduces avoidable rounding error when
8000 parsing floating point numbers. Together with earlier changes to
8001 float formatting/output, "round trips" like f.to_string().parse()
8002 now preserve the value of f exactly. Additionally, leading plus
8003 signs are now accepted][fp3].
8009 * `use` statements that import multiple items [can now rename
8010 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8011 * [Binops work correctly on fat pointers][binfat].
8012 * `pub extern crate`, which does not behave as expected, [issues a
8013 warning][pec] until a better solution is found.
8018 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8019 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8020 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8021 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8022 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8023 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8024 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8025 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8026 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8027 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8028 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8029 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8030 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8031 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8032 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8033 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8034 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8035 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8037 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8038 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8039 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8040 `f64::from_str_radix`.
8041 * [Reverse-searching strings is faster with the 'two-way'
8043 * [`std::io::copy` allows `?Sized` arguments][cc].
8044 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8045 [override `count`, `nth` and `last` with an O(1)
8046 implementation][it].
8047 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8048 * [`IntoRawFd` has been added to the Unix-specific prelude,
8049 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8051 * [`Extend<String>` and `FromIterator<String` are both implemented for
8053 * [`IntoIterator` is implemented for references to `Option` and
8055 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8056 Copy`][ext] as part of [RFC 839]. This will cause type inference
8057 breakage in rare situations.
8058 * [`BinaryHeap` implements `Debug`][bh2].
8059 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8061 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8062 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8063 * [String comparison is faster][faststr].
8064 * `&mut T` where `T: std::fmt::Write` [also implements
8065 `std::fmt::Write`][mutw].
8066 * [A stable regression in `VecDeque::push_back` and other
8067 capacity-altering methods that caused panics for zero-sized types
8069 * [Function pointers implement traits for up to 12 parameters][fp2].
8074 * The compiler [no longer uses the 'morestack' feature to prevent
8075 stack overflow][mm]. Instead it uses guard pages and stack
8076 probes (though stack probes are not yet implemented on any platform
8078 * [The compiler matches traits faster when projections are involved][p].
8079 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8081 * [Cargo now displays useful information about what its doing during
8082 `cargo update`][cu].
8084 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8085 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8086 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8087 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8088 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8089 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8090 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8091 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8092 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8093 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8094 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8095 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8096 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8097 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8098 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8099 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8100 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8101 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8102 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8103 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8104 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8105 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8106 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8107 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8108 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8109 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8110 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8111 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8112 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8113 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8114 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8115 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8116 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8117 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8118 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8119 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8120 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8121 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8122 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8123 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8124 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8125 [bh2]: https://github.com/rust-lang/rust/pull/28156
8126 [binfat]: https://github.com/rust-lang/rust/pull/28270
8127 [bm]: https://github.com/rust-lang/rust/pull/28197
8128 [cc]: https://github.com/rust-lang/rust/pull/27531
8129 [crlf]: https://github.com/rust-lang/rust/pull/28034
8130 [cu]: https://github.com/rust-lang/cargo/pull/1931
8131 [d]: https://github.com/rust-lang/rust/pull/27825
8132 [dep]: https://github.com/rust-lang/rust/pull/28339
8133 [es]: https://github.com/rust-lang/rust/pull/27956
8134 [ext]: https://github.com/rust-lang/rust/pull/28094
8135 [faststr]: https://github.com/rust-lang/rust/pull/28338
8136 [ffi]: https://github.com/rust-lang/rust/pull/28779
8137 [fp]: https://github.com/rust-lang/rust/pull/28268
8138 [fp2]: https://github.com/rust-lang/rust/pull/28560
8139 [fp3]: https://github.com/rust-lang/rust/pull/27307
8140 [i]: https://github.com/rust-lang/rust/pull/27451
8141 [into2]: https://github.com/rust-lang/rust/pull/28039
8142 [it]: https://github.com/rust-lang/rust/pull/27652
8143 [mm]: https://github.com/rust-lang/rust/pull/27338
8144 [mutw]: https://github.com/rust-lang/rust/pull/28368
8145 [sound]: https://github.com/rust-lang/rust/pull/27641
8146 [p]: https://github.com/rust-lang/rust/pull/27866
8147 [pec]: https://github.com/rust-lang/rust/pull/28486
8148 [pr]: https://github.com/rust-lang/rust/pull/27896
8149 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8150 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8151 [s]: https://github.com/rust-lang/rust/pull/27474
8152 [stab]: https://github.com/rust-lang/rust/pull/28339
8153 [stat]: https://github.com/rust-lang/rust/pull/28321
8154 [vd]: https://github.com/rust-lang/rust/pull/28494
8156 Version 1.3.0 (2015-09-17)
8157 ==============================
8159 * ~900 changes, numerous bugfixes
8164 * The [new object lifetime defaults][nold] have been [turned
8165 on][nold2] after a cycle of warnings about the change. Now types
8166 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8167 being interpreted as `&'a Box<Trait+'a>` to `&'a
8168 Box<Trait+'static>`.
8169 * [The Rustonomicon][nom] is a new book in the official documentation
8170 that dives into writing unsafe Rust.
8171 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8172 timekeeping is employed by other std APIs, as well as out-of-tree
8178 * The [new object lifetime defaults][nold] have been [turned
8179 on][nold2] after a cycle of warnings about the change.
8180 * There is a known [regression][lr] in how object lifetime elision is
8181 interpreted, the proper solution for which is undetermined.
8182 * The `#[prelude_import]` attribute, an internal implementation
8183 detail, was accidentally stabilized previously. [It has been put
8184 behind the `prelude_import` feature gate][pi]. This change is
8185 believed to break no existing code.
8186 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8187 [more sane for dynamically sized types][dst3]. Code that relied on
8188 the previous behavior is thought to be broken.
8189 * The `dropck` rules, which checks that destructors can't access
8190 destroyed values, [have been updated][dropck] to match the
8191 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8192 cause some previously-compiling code to no longer build.
8197 * The [new object lifetime defaults][nold] have been [turned
8198 on][nold2] after a cycle of warnings about the change.
8199 * Semicolons may [now follow types and paths in
8200 macros](https://github.com/rust-lang/rust/pull/27000).
8201 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8202 [more sane for dynamically sized types][dst3]. Code that relied on
8203 the previous behavior is not known to exist, and suspected to be
8205 * `'static` variables [may now be recursive][st].
8206 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8207 implementations correctly.
8208 * The `dropck` rules, which checks that destructors can't access
8209 destroyed values, [have been updated][dropck] to match the
8215 * The [`Duration`] API, [has been stabilized][ds], as well as the
8216 `std::time` module, which presently contains only `Duration`.
8217 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8218 * The owned C string, [`CString`], implements [`Borrow`] and the
8219 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8220 these allow C strings to be borrowed and cloned in generic code.
8221 * [`CStr`] implements [`Debug`].
8222 * [`AtomicPtr`] implements [`Debug`].
8223 * [`Error`] trait objects [can be downcast to their concrete types][e]
8224 in many common configurations, using the [`is`], [`downcast`],
8225 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8227 * Searching for substrings now [employs the two-way algorithm][search]
8228 instead of doing a naive search. This gives major speedups to a
8229 number of methods, including [`contains`][sc], [`find`][sf],
8230 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8231 [`ends_with`][sew] are also faster.
8232 * The performance of `PartialEq` for slices is [much faster][ps].
8233 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8234 is overridden and optimized by the implementations for scalars.
8235 * The [`Hasher`] trait now has a number of specialized `write_*`
8236 methods for primitive types, for efficiency.
8237 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8238 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8239 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8240 of [`std::error::Error::cause`][iec] also delegates to the inner
8242 * [`process::Child`][pc] gained the [`id`] method, which returns a
8243 `u32` representing the platform-specific process identifier.
8244 * The [`connect`] method on slices is deprecated, replaced by the new
8245 [`join`] method (note that both of these are on the *unstable*
8246 [`SliceConcatExt`] trait, but through the magic of the prelude are
8247 available to stable code anyway).
8248 * The [`Div`] operator is implemented for [`Wrapping`] types.
8249 * [`DerefMut` is implemented for `String`][dms].
8250 * Performance of SipHash (the default hasher for `HashMap`) is
8251 [better for long data][sh].
8252 * [`AtomicPtr`] implements [`Send`].
8253 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8254 are now [specialized to use uninitialized buffers for increased
8256 * Lifetime parameters of foreign functions [are now resolved
8262 * Rust can now, with some coercion, [produce programs that run on
8263 Windows XP][xp], though XP is not considered a supported platform.
8264 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8265 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8266 recommended for use in 1.3, though should be fully-functional
8267 in the [64-bit 1.4 beta][b14].
8268 * On Fedora-based systems installation will [properly configure the
8269 dynamic linker][fl].
8270 * The compiler gained many new extended error descriptions, which can
8271 be accessed with the `--explain` flag.
8272 * The `dropck` pass, which checks that destructors can't access
8273 destroyed values, [has been rewritten][dropck]. This fixes some
8274 soundness holes, and as such will cause some previously-compiling
8275 code to no longer build.
8276 * `rustc` now uses [LLVM to write archive files where possible][ar].
8277 Eventually this will eliminate the compiler's dependency on the ar
8279 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8280 supported FreeBSD on x86_64).
8281 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8282 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8284 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8285 will kill the process instead of leaking][nlp].
8287 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8288 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8289 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8290 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8291 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8292 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8293 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8294 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8295 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8296 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8297 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8298 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8299 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8300 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8301 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8302 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8303 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8304 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8305 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8306 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8307 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8308 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8309 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8310 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8311 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8312 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8313 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8314 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8315 [ar]: https://github.com/rust-lang/rust/pull/26926
8316 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8317 [dms]: https://github.com/rust-lang/rust/pull/26241
8318 [dropck]: https://github.com/rust-lang/rust/pull/27261
8319 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8320 [ds]: https://github.com/rust-lang/rust/pull/26818
8321 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8322 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8323 [dst3]: https://github.com/rust-lang/rust/pull/27351
8324 [e]: https://github.com/rust-lang/rust/pull/24793
8325 [f]: https://github.com/rust-lang/rust/pull/26588
8326 [fb]: https://github.com/rust-lang/rust/pull/26959
8327 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8328 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8329 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8330 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8331 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8332 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8333 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8334 [lic]: https://github.com/rust-lang/rust/pull/26583
8335 [lnu]: https://github.com/rust-lang/rust/pull/27026
8336 [lr]: https://github.com/rust-lang/rust/issues/27248
8337 [lum]: https://github.com/rust-lang/rust/pull/26378
8338 [lur]: https://github.com/rust-lang/rust/pull/26783
8339 [nlp]: https://github.com/rust-lang/rust/pull/27176
8340 [nold2]: https://github.com/rust-lang/rust/pull/27045
8341 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8342 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8343 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8344 [pi]: https://github.com/rust-lang/rust/pull/26699
8345 [ps]: https://github.com/rust-lang/rust/pull/26884
8346 [rte]: https://github.com/rust-lang/rust/pull/26950
8347 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8348 [search]: https://github.com/rust-lang/rust/pull/26327
8349 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8350 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8351 [sh]: https://github.com/rust-lang/rust/pull/27280
8352 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8353 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8354 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8355 [st]: https://github.com/rust-lang/rust/pull/26630
8356 [win1]: https://github.com/rust-lang/rust/pull/26569
8357 [win2]: https://github.com/rust-lang/rust/pull/26741
8358 [win3]: https://github.com/rust-lang/rust/pull/26741
8359 [win4]: https://github.com/rust-lang/rust/pull/27210
8360 [xp]: https://github.com/rust-lang/rust/pull/26569
8362 Version 1.2.0 (2015-08-07)
8363 ==========================
8365 * ~1200 changes, numerous bugfixes
8370 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8371 like `Rc` to contain types without a fixed size, arrays and trait
8372 objects, finally enabling use of `Rc<[T]>` and completing the
8373 implementation of DST.
8374 * [Parallel codegen][parcodegen] is now working again, which can
8375 substantially speed up large builds in debug mode; It also gets
8376 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8377 jobs). It's not enabled by default, but will be "in the near
8378 future". It can be activated with the `-C codegen-units=N` flag to
8380 * This is the first release with [experimental support for linking
8381 with the MSVC linker and lib C on Windows (instead of using the GNU
8382 variants via MinGW)][win]. It is yet recommended only for the most
8383 intrepid Rustaceans.
8384 * Benchmark compilations are showing a 30% improvement in
8385 bootstrapping over 1.1.
8390 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8391 unicode case mapping, which is a previously-planned change in
8392 behavior and considered a bugfix.
8393 * [`mem::align_of`] now specifies [the *minimum alignment* for
8394 T][align], which is usually the alignment programs are interested
8395 in, and the same value reported by clang's
8396 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8398 * [The `#[packed]` attribute is no longer silently accepted by the
8399 compiler][packed]. This attribute did nothing and code that
8400 mentioned it likely did not work as intended.
8401 * Associated type defaults are [now behind the
8402 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8403 defaults *did not work*, but could be mentioned syntactically. As
8404 such this breakage has minimal impact.
8409 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8410 matching against dereferenceable values.
8415 * The [`Extend`] trait, which grows a collection from an iterator, is
8416 implemented over iterators of references, for `String`, `Vec`,
8417 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8418 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8419 * The [`iter::once`] function returns an iterator that yields a single
8420 element, and [`iter::empty`] returns an iterator that yields no
8422 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8423 over substring matches.
8424 * [`Cell`] and [`RefCell`] both implement `Eq`.
8425 * A number of methods for wrapping arithmetic are added to the
8426 integral types, [`wrapping_div`], [`wrapping_rem`],
8427 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8428 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8429 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8430 type.. It is illegal for the default arithmetic operations in Rust
8431 to overflow; the desire to wrap must be explicit.
8432 * The `{:#?}` formatting specifier [displays the alternate,
8433 pretty-printed][debugfmt] form of the `Debug` formatter. This
8434 feature was actually introduced prior to 1.0 with little
8436 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8437 for writing data to formatted strings, similar to [`io::Write`].
8438 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8439 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8440 are used by code generators to emit implementations of [`Debug`].
8441 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8442 methods that convert case, following Unicode case mapping.
8443 * It is now easier to handle poisoned locks. The [`PoisonError`]
8444 type, returned by failing lock operations, exposes `into_inner`,
8445 `get_ref`, and `get_mut`, which all give access to the inner lock
8446 guard, and allow the poisoned lock to continue to operate. The
8447 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8448 poisoned lock without attempting to take the lock.
8449 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8450 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8451 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8452 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8454 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8460 * `rustc` employs smarter heuristics for guessing at [typos].
8461 * `rustc` emits more efficient code for [no-op conversions between
8462 unsafe pointers][nop].
8463 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8464 resulting in faster compile times and smaller code.
8466 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8467 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8468 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8469 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8470 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8471 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8472 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8473 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8474 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8475 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8476 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8477 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8478 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8479 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8480 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8481 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8482 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8483 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8484 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8485 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8486 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8487 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8488 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8489 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8490 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8491 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8492 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8493 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8494 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8495 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8496 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8497 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8498 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8499 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8500 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8501 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8502 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8503 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8504 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8505 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8506 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8507 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8508 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8509 [align]: https://github.com/rust-lang/rust/pull/25646
8510 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8511 [typos]: https://github.com/rust-lang/rust/pull/26087
8512 [nop]: https://github.com/rust-lang/rust/pull/26336
8513 [fat]: https://github.com/rust-lang/rust/pull/26411
8514 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8515 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8516 [packed]: https://github.com/rust-lang/rust/pull/25541
8517 [ad]: https://github.com/rust-lang/rust/pull/27382
8518 [win]: https://github.com/rust-lang/rust/pull/25350
8520 Version 1.1.0 (2015-06-25)
8521 =========================
8523 * ~850 changes, numerous bugfixes
8528 * The [`std::fs` module has been expanded][fs] to expand the set of
8529 functionality exposed:
8530 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8531 don't incur a syscall on some platforms.
8532 * A `symlink_metadata` function has been added.
8533 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8534 access to all underlying information.
8535 * The compiler now contains extended explanations of many errors. When an error
8536 with an explanation occurs the compiler suggests using the `--explain` flag
8537 to read the explanation. Error explanations are also [available online][err-index].
8538 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8539 well as other work, the time to bootstrap the compiler decreased by
8545 * The [`str::split_whitespace`] method splits a string on unicode
8546 whitespace boundaries.
8547 * On both Windows and Unix, new extension traits provide conversion of
8548 I/O types to and from the underlying system handles. On Unix, these
8549 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8550 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8551 `TcpListener`, and `UpdSocket`. Further implementations for
8552 `std::process` will be stabilized later.
8553 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8554 Windows, symlinks can be created with
8555 `std::os::windows::symlink_dir` and
8556 `std::os::windows::symlink_file`.
8557 * The `mpsc::Receiver` type can now be converted into an iterator with
8558 `into_iter` on the [`IntoIterator`] trait.
8559 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8560 implementation of the [`From`] trait.
8561 * The `Debug` implementation for `RangeFull` [creates output that is
8562 more consistent with other implementations][rf].
8563 * [`Debug` is implemented for `File`][file].
8564 * The `Default` implementation for `Arc` [no longer requires `Sync +
8566 * [The `Iterator` methods `count`, `nth`, and `last` have been
8567 overridden for slices to have O(1) performance instead of O(n)][si].
8568 * Incorrect handling of paths on Windows has been improved in both the
8569 compiler and the standard library.
8570 * [`AtomicPtr` gained a `Default` implementation][ap].
8571 * In accordance with Rust's policy on arithmetic overflow `abs` now
8572 [panics on overflow when debug assertions are enabled][abs].
8573 * The [`Cloned`] iterator, which was accidentally left unstable for
8574 1.0 [has been stabilized][c].
8575 * The [`Incoming`] iterator, which iterates over incoming TCP
8576 connections, and which was accidentally unnamable in 1.0, [is now
8577 properly exported][inc].
8578 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8579 `sift_up` or `sift_down` panic][bh].
8580 * The [`split_off`] method of `LinkedList` [no longer corrupts
8581 the list in certain scenarios][ll].
8586 * Type checking performance [has improved notably][sk] with
8587 [multiple improvements][pre].
8588 * The compiler [suggests code changes][ch] for more errors.
8589 * rustc and it's build system have experimental support for [building
8590 toolchains against MUSL][m] instead of glibc on Linux.
8591 * The compiler defines the `target_env` cfg value, which is used for
8592 distinguishing toolchains that are otherwise for the same
8593 platform. Presently this is set to `gnu` for common GNU Linux
8594 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8595 * The [`cargo rustc`][crc] command invokes a build with custom flags
8597 * [Android executables are always position independent][pie].
8598 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8601 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8602 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8603 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8604 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8605 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8606 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8607 [rf]: https://github.com/rust-lang/rust/pull/24491
8608 [err-index]: https://doc.rust-lang.org/error-index.html
8609 [sk]: https://github.com/rust-lang/rust/pull/24615
8610 [pre]: https://github.com/rust-lang/rust/pull/25323
8611 [file]: https://github.com/rust-lang/rust/pull/24598
8612 [ch]: https://github.com/rust-lang/rust/pull/24683
8613 [arc]: https://github.com/rust-lang/rust/pull/24695
8614 [si]: https://github.com/rust-lang/rust/pull/24701
8615 [ap]: https://github.com/rust-lang/rust/pull/24834
8616 [m]: https://github.com/rust-lang/rust/pull/24777
8617 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8618 [crc]: https://github.com/rust-lang/cargo/pull/1568
8619 [pie]: https://github.com/rust-lang/rust/pull/24953
8620 [abs]: https://github.com/rust-lang/rust/pull/25441
8621 [c]: https://github.com/rust-lang/rust/pull/25496
8622 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8623 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8624 [inc]: https://github.com/rust-lang/rust/pull/25522
8625 [bh]: https://github.com/rust-lang/rust/pull/25856
8626 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8627 [ll]: https://github.com/rust-lang/rust/pull/26022
8628 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8629 [drop]: https://github.com/rust-lang/rust/pull/24935
8631 Version 1.0.0 (2015-05-15)
8632 ========================
8634 * ~1500 changes, numerous bugfixes
8639 * The vast majority of the standard library is now `#[stable]`. It is
8640 no longer possible to use unstable features with a stable build of
8642 * Many popular crates on [crates.io] now work on the stable release
8644 * Arithmetic on basic integer types now [checks for overflow in debug
8650 * Several [restrictions have been added to trait coherence][coh] in
8651 order to make it easier for upstream authors to change traits
8652 without breaking downstream code.
8653 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8654 improve error messages and macro behavior. For example, `0b1234` is
8655 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8656 * Trait bounds [are always invariant][inv], eliminating the need for
8657 the `PhantomFn` and `MarkerTrait` lang items, which have been
8659 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8660 "foo" as bar` syntax has been replaced with `extern crate foo as
8661 bar`, and Cargo now automatically translates "-" in *package* names
8662 to underscore for the crate name.
8663 * [Lifetime shadowing is an error][lt].
8664 * [`Send` no longer implies `'static`][send-rfc].
8665 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8666 `MyType::default()`.
8667 * Primitive types [now have inherent methods][prim-inherent],
8668 obviating the need for extension traits like `SliceExt`.
8669 * Methods with `Self: Sized` in their `where` clause are [considered
8670 object-safe][self-sized], allowing many extension traits like
8671 `IteratorExt` to be merged into the traits they extended.
8672 * You can now [refer to associated types][assoc-where] whose
8673 corresponding trait bounds appear only in a `where` clause.
8674 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8675 like `Send` and `Sync` are now library-defined.
8676 * A [Reflect trait][reflect] was introduced, which means that
8677 downcasting via the `Any` trait is effectively limited to concrete
8678 types. This helps retain the potentially-important "parametricity"
8679 property: generic code cannot behave differently for different type
8680 arguments except in minor ways.
8681 * The `unsafe_destructor` feature is now deprecated in favor of the
8682 [new `dropck`][dropck]. This change is a major reduction in unsafe
8688 * The `thread_local` module [has been renamed to `std::thread`][th].
8689 * The methods of `IteratorExt` [have been moved to the `Iterator`
8691 * Several traits that implement Rust's conventions for type
8692 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8693 [centralized in the `std::convert` module][con].
8694 * The `FromError` trait [was removed in favor of `From`][fe].
8695 * The basic sleep function [has moved to
8696 `std::thread::sleep_ms`][slp].
8697 * The `splitn` function now takes an `n` parameter that represents the
8698 number of items yielded by the returned iterator [instead of the
8699 number of 'splits'][spl].
8700 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8701 * [Derived implementations of `PartialOrd` now order enums according
8702 to their explicitly-assigned discriminants][po].
8703 * [Methods for searching strings are generic over `Pattern`s][pat],
8704 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8706 * [In method resolution, object methods are resolved before inherent
8708 * [`String::from_str` has been deprecated in favor of the `From` impl,
8709 `String::from`][sf].
8710 * [`io::Error` implements `Sync`][ios].
8711 * [The `words` method on `&str` has been replaced with
8712 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8714 * The new path and IO modules are complete and `#[stable]`. This
8715 was the major library focus for this cycle.
8716 * The path API was [revised][path-normalize] to normalize `.`,
8717 adjusting the tradeoffs in favor of the most common usage.
8718 * A large number of remaining APIs in `std` were also stabilized
8719 during this cycle; about 75% of the non-deprecated API surface
8721 * The new [string pattern API][string-pattern] landed, which makes
8722 the string slice API much more internally consistent and flexible.
8723 * A new set of [generic conversion traits][conversion] replaced
8724 many existing ad hoc traits.
8725 * Generic numeric traits were [completely removed][num-traits]. This
8726 was made possible thanks to inherent methods for primitive types,
8727 and the removal gives maximal flexibility for designing a numeric
8728 hierarchy in the future.
8729 * The `Fn` traits are now related via [inheritance][fn-inherit]
8730 and provide ergonomic [blanket implementations][fn-blanket].
8731 * The `Index` and `IndexMut` traits were changed to
8732 [take the index by value][index-value], enabling code like
8733 `hash_map["string"]` to work.
8734 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8735 `Copy` data is known to be `Clone` as well.
8740 * Many errors now have extended explanations that can be accessed with
8741 the `--explain` flag to `rustc`.
8742 * Many new examples have been added to the standard library
8744 * rustdoc has received a number of improvements focused on completion
8746 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8747 * Much headway was made on ecosystem-wide CI, making it possible
8748 to [compare builds for breakage][ci-compare].
8751 [crates.io]: http://crates.io
8752 [clo]: https://github.com/rust-lang/rust/pull/24034
8753 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8754 [con]: https://github.com/rust-lang/rust/pull/23875
8755 [cr]: https://github.com/rust-lang/rust/pull/23419
8756 [fe]: https://github.com/rust-lang/rust/pull/23879
8757 [ie]: https://github.com/rust-lang/rust/pull/23300
8758 [inv]: https://github.com/rust-lang/rust/pull/23938
8759 [ios]: https://github.com/rust-lang/rust/pull/24133
8760 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8761 [lt]: https://github.com/rust-lang/rust/pull/24057
8762 [meth]: https://github.com/rust-lang/rust/pull/24056
8763 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8764 [po]: https://github.com/rust-lang/rust/pull/24270
8765 [sf]: https://github.com/rust-lang/rust/pull/24517
8766 [slp]: https://github.com/rust-lang/rust/pull/23949
8767 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8768 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8769 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8770 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8771 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8772 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8773 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8774 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8775 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8776 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8777 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8778 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8779 [reflect]: https://github.com/rust-lang/rust/pull/23712
8780 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8781 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8782 [index-value]: https://github.com/rust-lang/rust/pull/23601
8783 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8784 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8785 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8786 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8787 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8788 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8791 Version 1.0.0-alpha.2 (2015-02-20)
8792 =====================================
8794 * ~1300 changes, numerous bugfixes
8798 * The various I/O modules were [overhauled][io-rfc] to reduce
8799 unnecessary abstractions and provide better interoperation with
8800 the underlying platform. The old `io` module remains temporarily
8802 * The standard library now [participates in feature gating][feat],
8803 so use of unstable libraries now requires a `#![feature(...)]`
8804 attribute. The impact of this change is [described on the
8805 forum][feat-forum]. [RFC][feat-rfc].
8809 * `for` loops [now operate on the `IntoIterator` trait][into],
8810 which eliminates the need to call `.iter()`, etc. to iterate
8811 over collections. There are some new subtleties to remember
8812 though regarding what sort of iterators various types yield, in
8813 particular that `for foo in bar { }` yields values from a move
8814 iterator, destroying the original collection. [RFC][into-rfc].
8815 * Objects now have [default lifetime bounds][obj], so you don't
8816 have to write `Box<Trait+'static>` when you don't care about
8817 storing references. [RFC][obj-rfc].
8818 * In types that implement `Drop`, [lifetimes must outlive the
8819 value][drop]. This will soon make it possible to safely
8820 implement `Drop` for types where `#[unsafe_destructor]` is now
8821 required. Read the [gorgeous RFC][drop-rfc] for details.
8822 * The fully qualified <T as Trait>::X syntax lets you set the Self
8823 type for a trait method or associated type. [RFC][ufcs-rfc].
8824 * References to types that implement `Deref<U>` now [automatically
8825 coerce to references][deref] to the dereferenced type `U`,
8826 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8827 should eliminate many unsightly uses of `&*`, as when converting
8828 from references to vectors into references to
8829 slices. [RFC][deref-rfc].
8830 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8831 `|:|`) is obsolete and closure kind is inferred from context.
8832 * [`Self` is a keyword][Self].
8836 * The `Show` and `String` formatting traits [have been
8837 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8838 their related purposes. Automatically getting a string
8839 conversion to use with `format!("{:?}", something_to_debug)` is
8840 now written `#[derive(Debug)]`.
8841 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8842 OsStr}`, provide strings in platform-specific encodings for easier
8843 interop with system APIs. [RFC][osstr-rfc].
8844 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8845 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8846 creating raw pointers.
8850 * Certain long error messages of the form 'expected foo found bar'
8851 are now [split neatly across multiple
8852 lines][multiline]. Examples in the PR.
8853 * On Unix Rust can be [uninstalled][un] by running
8854 `/usr/local/lib/rustlib/uninstall.sh`.
8855 * The `#[rustc_on_unimplemented]` attribute, requiring the
8856 'on_unimplemented' feature, lets rustc [display custom error
8857 messages when a trait is expected to be implemented for a type
8862 * Rust is tested against a [LALR grammar][lalr], which parses
8863 almost all the Rust files that rustc does.
8865 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8866 [close]: https://github.com/rust-lang/rust/pull/21843
8867 [deref]: https://github.com/rust-lang/rust/pull/21351
8868 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8869 [drop]: https://github.com/rust-lang/rust/pull/21972
8870 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8871 [feat]: https://github.com/rust-lang/rust/pull/21248
8872 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8873 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8874 [fmt]: https://github.com/rust-lang/rust/pull/21457
8875 [into]: https://github.com/rust-lang/rust/pull/20790
8876 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8877 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8878 [lalr]: https://github.com/rust-lang/rust/pull/21452
8879 [multiline]: https://github.com/rust-lang/rust/pull/19870
8880 [obj]: https://github.com/rust-lang/rust/pull/22230
8881 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8882 [onun]: https://github.com/rust-lang/rust/pull/20889
8883 [osstr]: https://github.com/rust-lang/rust/pull/21488
8884 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8885 [Self]: https://github.com/rust-lang/rust/pull/22158
8886 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8887 [un]: https://github.com/rust-lang/rust/pull/22256
8890 Version 1.0.0-alpha (2015-01-09)
8891 ==================================
8893 * ~2400 changes, numerous bugfixes
8897 * The language itself is considered feature complete for 1.0,
8898 though there will be many usability improvements and bugfixes
8899 before the final release.
8900 * Nearly 50% of the public API surface of the standard library has
8901 been declared 'stable'. Those interfaces are unlikely to change
8903 * The long-running debate over integer types has been
8904 [settled][ints]: Rust will ship with types named `isize` and
8905 `usize`, rather than `int` and `uint`, for pointer-sized
8906 integers. Guidelines will be rolled out during the alpha cycle.
8907 * Most crates that are not `std` have been moved out of the Rust
8908 distribution into the Cargo ecosystem so they can evolve
8909 separately and don't need to be stabilized as quickly, including
8910 'time', 'getopts', 'num', 'regex', and 'term'.
8911 * Documentation continues to be expanded with more API coverage, more
8912 examples, and more in-depth explanations. The guides have been
8913 consolidated into [The Rust Programming Language][trpl].
8914 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8915 * All official Rust binary installers now come with [Cargo], the
8916 Rust package manager.
8920 * Closures have been [completely redesigned][unboxed] to be
8921 implemented in terms of traits, can now be used as generic type
8922 bounds and thus monomorphized and inlined, or via an opaque
8923 pointer (boxed) as in the old system. The new system is often
8924 referred to as 'unboxed' closures.
8925 * Traits now support [associated types][assoc], allowing families
8926 of related types to be defined together and used generically in
8928 * Enum variants are [namespaced by their type names][enum].
8929 * [`where` clauses][where] provide a more versatile and attractive
8930 syntax for specifying generic bounds, though the previous syntax
8932 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8934 * Rust [no longer has a runtime][rt] of any description, and only
8935 supports OS threads, not green threads.
8936 * At long last, Rust has been overhauled for 'dynamically-sized
8937 types' ([DST]), which integrates 'fat pointers' (object types,
8938 arrays, and `str`) more deeply into the type system, making it
8940 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8941 `..j` that produce range types and which, when combined with the
8942 `Index` operator and multidispatch, leads to a convenient slice
8944 * The new range syntax revealed an ambiguity in the fixed-length
8945 array syntax, so now fixed length arrays [are written `[T;
8947 * The `Copy` trait is no longer implemented automatically. Unsafe
8948 pointers no longer implement `Sync` and `Send` so types
8949 containing them don't automatically either. `Sync` and `Send`
8950 are now 'unsafe traits' so one can "forcibly" implement them via
8951 `unsafe impl` if a type confirms to the requirements for them
8952 even though the internals do not (e.g. structs containing unsafe
8953 pointers like `Arc`). These changes are intended to prevent some
8954 footguns and are collectively known as [opt-in built-in
8955 traits][oibit] (though `Sync` and `Send` will soon become pure
8956 library types unknown to the compiler).
8957 * Operator traits now take their operands [by value][ops], and
8958 comparison traits can use multidispatch to compare one type
8959 against multiple other types, allowing e.g. `String` to be
8960 compared with `&str`.
8961 * `if let` and `while let` are no longer feature-gated.
8962 * Rust has adopted a more [uniform syntax for escaping unicode
8963 characters][unicode].
8964 * `macro_rules!` [has been declared stable][mac]. Though it is a
8965 flawed system it is sufficiently popular that it must be usable
8966 for 1.0. Effort has gone into [future-proofing][mac-future] it
8967 in ways that will allow other macro systems to be developed in
8968 parallel, and won't otherwise impact the evolution of the
8970 * The prelude has been [pared back significantly][prelude] such
8971 that it is the minimum necessary to support the most pervasive
8972 code patterns, and through [generalized where clauses][where]
8973 many of the prelude extension traits have been consolidated.
8974 * Rust's rudimentary reflection [has been removed][refl], as it
8975 incurred too much code generation for little benefit.
8976 * [Struct variants][structvars] are no longer feature-gated.
8977 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8978 known as 'higher-ranked trait bounds', this crucially allows
8979 unboxed closures to work.
8980 * Macros invocations surrounded by parens or square brackets and
8981 not terminated by a semicolon are [parsed as
8982 expressions][macros], which makes expressions like `vec![1i32,
8983 2, 3].len()` work as expected.
8984 * Trait objects now implement their traits automatically, and
8985 traits that can be coerced to objects now must be [object
8987 * Automatically deriving traits is now done with `#[derive(...)]`
8988 not `#[deriving(...)]` for [consistency with other naming
8989 conventions][derive].
8990 * Importing the containing module or enum at the same time as
8991 items or variants they contain is [now done with `self` instead
8992 of `mod`][self], as in use `foo::{self, bar}`
8993 * Glob imports are no longer feature-gated.
8994 * The `box` operator and `box` patterns have been feature-gated
8995 pending a redesign. For now unique boxes should be allocated
8996 like other containers, with `Box::new`.
9000 * A [series][coll1] of [efforts][coll2] to establish
9001 [conventions][coll3] for collections types has resulted in API
9002 improvements throughout the standard library.
9003 * New [APIs for error handling][err] provide ergonomic interop
9004 between error types, and [new conventions][err-conv] describe
9005 more clearly the recommended error handling strategies in Rust.
9006 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9007 it is easier to discuss failure in the context of error handling
9008 without making clarifications as to whether you are referring to
9009 the 'fail' macro or failure more generally.
9010 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9011 syscall when available.
9012 * The 'serialize' crate has been renamed 'rustc-serialize' and
9013 moved out of the distribution to Cargo. Although it is widely
9014 used now, it is expected to be superseded in the near future.
9015 * The `Show` formatter, typically implemented with
9016 `#[derive(Show)]` is [now requested with the `{:?}`
9017 specifier][show] and is intended for use by all types, for uses
9018 such as `println!` debugging. The new `String` formatter must be
9019 implemented by hand, uses the `{}` specifier, and is intended
9020 for full-fidelity conversions of things that can logically be
9021 represented as strings.
9025 * [Flexible target specification][flex] allows rustc's code
9026 generation to be configured to support otherwise-unsupported
9028 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9029 respective debuggers with Rust-appropriate pretty-printing.
9030 * The Windows installation of Rust is distributed with the
9031 MinGW components currently required to link binaries on that
9036 * Nullable enum optimizations have been extended to more types so
9037 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9038 space than the inner types themselves.
9039 * Work has begun on supporting AArch64.
9041 [Cargo]: https://crates.io
9042 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9043 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9044 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9045 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9046 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9047 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9048 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9049 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9050 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9051 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9052 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9053 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9054 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9055 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9056 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9057 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9058 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9059 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9060 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9061 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9062 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9063 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9064 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9065 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9066 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9067 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9068 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9069 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9070 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9071 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9072 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9073 [trpl]: https://doc.rust-lang.org/book/index.html
9074 [rbe]: http://rustbyexample.com/
9077 Version 0.12.0 (2014-10-09)
9078 =============================
9080 * ~1900 changes, numerous bugfixes
9084 * The introductory documentation (now called The Rust Guide) has
9085 been completely rewritten, as have a number of supplementary
9087 * Rust's package manager, Cargo, continues to improve and is
9088 sometimes considered to be quite awesome.
9089 * Many API's in `std` have been reviewed and updated for
9090 consistency with the in-development Rust coding
9091 guidelines. The standard library documentation tracks
9092 stabilization progress.
9093 * Minor libraries have been moved out-of-tree to the rust-lang org
9094 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9095 be installed with Cargo.
9096 * Lifetime elision allows lifetime annotations to be left off of
9097 function declarations in many common scenarios.
9098 * Rust now works on 64-bit Windows.
9101 * Indexing can be overloaded with the `Index` and `IndexMut`
9103 * The `if let` construct takes a branch only if the `let` pattern
9104 matches, currently behind the 'if_let' feature gate.
9105 * 'where clauses', a more flexible syntax for specifying trait
9106 bounds that is more aesthetic, have been added for traits and
9107 free functions. Where clauses will in the future make it
9108 possible to constrain associated types, which would be
9109 impossible with the existing syntax.
9110 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9111 the 'slicing_syntax' feature gate, and can be overloaded with
9112 the `Slice` or `SliceMut` traits.
9113 * The syntax for matching of sub-slices has been changed to use a
9114 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9115 consistency with other uses of `..` and to future-proof
9116 potential additional uses of the syntax.
9117 * The syntax for matching inclusive ranges in patterns has changed
9118 from `0..3` to `0...4` to be consistent with the exclusive range
9120 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9121 c]`) has been put behind the 'advanced_slice_patterns' feature
9122 gate and may be removed in the future.
9123 * Components of tuples and tuple structs can be extracted using
9124 the `value.0` syntax, currently behind the `tuple_indexing`
9126 * The `#[crate_id]` attribute is no longer supported; versioning
9127 is handled by the package manager.
9128 * Renaming crate imports are now written `extern crate foo as bar`
9129 instead of `extern crate bar = foo`.
9130 * Renaming use statements are now written `use foo as bar` instead
9132 * `let` and `match` bindings and argument names in macros are now
9134 * The new, more efficient, closure types ('unboxed closures') have
9135 been added under a feature gate, 'unboxed_closures'. These will
9136 soon replace the existing closure types, once higher-ranked
9137 trait lifetimes are added to the language.
9138 * `move` has been added as a keyword, for indicating closures
9139 that capture by value.
9140 * Mutation and assignment is no longer allowed in pattern guards.
9141 * Generic structs and enums can now have trait bounds.
9142 * The `Share` trait is now called `Sync` to free up the term
9143 'shared' to refer to 'shared reference' (the default reference
9145 * Dynamically-sized types have been mostly implemented,
9146 unifying the behavior of fat-pointer types with the rest of the
9148 * As part of dynamically-sized types, the `Sized` trait has been
9149 introduced, which qualifying types implement by default, and
9150 which type parameters expect by default. To specify that a type
9151 parameter does not need to be sized, write `<Sized? T>`. Most
9152 types are `Sized`, notable exceptions being unsized arrays
9153 (`[T]`) and trait types.
9154 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9155 * Lifetime bounds can now be applied to type parameters and object
9157 * The old, reference counted GC type, `Gc<T>` which was once
9158 denoted by the `@` sigil, has finally been removed. GC will be
9159 revisited in the future.
9162 * Library documentation has been improved for a number of modules.
9163 * Bit-vectors, collections::bitv has been modernized.
9164 * The url crate is deprecated in favor of
9165 http://github.com/servo/rust-url, which can be installed with
9167 * Most I/O stream types can be cloned and subsequently closed from
9169 * A `std::time::Duration` type has been added for use in I/O
9170 methods that rely on timers, as well as in the 'time' crate's
9171 `Timespec` arithmetic.
9172 * The runtime I/O abstraction layer that enabled the green thread
9173 scheduler to do non-thread-blocking I/O has been removed, along
9174 with the libuv-based implementation employed by the green thread
9175 scheduler. This will greatly simplify the future I/O work.
9176 * `collections::btree` has been rewritten to have a more
9177 idiomatic and efficient design.
9180 * rustdoc output now indicates the stability levels of API's.
9181 * The `--crate-name` flag can specify the name of the crate
9182 being compiled, like `#[crate_name]`.
9183 * The `-C metadata` specifies additional metadata to hash into
9184 symbol names, and `-C extra-filename` specifies additional
9185 information to put into the output filename, for use by the
9186 package manager for versioning.
9187 * debug info generation has continued to improve and should be
9188 more reliable under both gdb and lldb.
9189 * rustc has experimental support for compiling in parallel
9190 using the `-C codegen-units` flag.
9191 * rustc no longer encodes rpath information into binaries by
9195 * Stack usage has been optimized with LLVM lifetime annotations.
9196 * Official Rust binaries on Linux are more compatible with older
9197 kernels and distributions, built on CentOS 5.10.
9200 Version 0.11.0 (2014-07-02)
9201 ==========================
9203 * ~1700 changes, numerous bugfixes
9206 * ~[T] has been removed from the language. This type is superseded by
9208 * ~str has been removed from the language. This type is superseded by
9210 * ~T has been removed from the language. This type is superseded by the
9212 * @T has been removed from the language. This type is superseded by the
9213 standard library's std::gc::Gc<T> type.
9214 * Struct fields are now all private by default.
9215 * Vector indices and shift amounts are both required to be a `uint`
9216 instead of any integral type.
9217 * Byte character, byte string, and raw byte string literals are now all
9218 supported by prefixing the normal literal with a `b`.
9219 * Multiple ABIs are no longer allowed in an ABI string
9220 * The syntax for lifetimes on closures/procedures has been tweaked
9221 slightly: `<'a>|A, B|: 'b + K -> T`
9222 * Floating point modulus has been removed from the language; however it
9223 is still provided by a library implementation.
9224 * Private enum variants are now disallowed.
9225 * The `priv` keyword has been removed from the language.
9226 * A closure can no longer be invoked through a &-pointer.
9227 * The `use foo, bar, baz;` syntax has been removed from the language.
9228 * The transmute intrinsic no longer works on type parameters.
9229 * Statics now allow blocks/items in their definition.
9230 * Trait bounds are separated from objects with + instead of : now.
9231 * Objects can no longer be read while they are mutably borrowed.
9232 * The address of a static is now marked as insignificant unless the
9233 #[inline(never)] attribute is placed it.
9234 * The #[unsafe_destructor] attribute is now behind a feature gate.
9235 * Struct literals are no longer allowed in ambiguous positions such as
9236 if, while, match, and for..in.
9237 * Declaration of lang items and intrinsics are now feature-gated by
9239 * Integral literals no longer default to `int`, and floating point
9240 literals no longer default to `f64`. Literals must be suffixed with an
9241 appropriate type if inference cannot determine the type of the
9243 * The Box<T> type is no longer implicitly borrowed to &mut T.
9244 * Procedures are now required to not capture borrowed references.
9247 * The standard library is now a "facade" over a number of underlying
9248 libraries. This means that development on the standard library should
9249 be speedier due to smaller crates, as well as a clearer line between
9251 * A new library, libcore, lives under the standard library's facade
9252 which is Rust's "0-assumption" library, suitable for embedded and
9253 kernel development for example.
9254 * A regex crate has been added to the standard distribution. This crate
9255 includes statically compiled regular expressions.
9256 * The unwrap/unwrap_err methods on Result require a Show bound for
9257 better error messages.
9258 * The return types of the std::comm primitives have been centralized
9259 around the Result type.
9260 * A number of I/O primitives have gained the ability to time out their
9262 * A number of I/O primitives have gained the ability to close their
9263 reading/writing halves to cancel pending operations.
9264 * Reverse iterator methods have been removed in favor of `rev()` on
9265 their forward-iteration counterparts.
9266 * A bitflags! macro has been added to enable easy interop with C and
9267 management of bit flags.
9268 * A debug_assert! macro is now provided which is disabled when
9269 `--cfg ndebug` is passed to the compiler.
9270 * A graphviz crate has been added for creating .dot files.
9271 * The std::cast module has been migrated into std::mem.
9272 * The std::local_data api has been migrated from freestanding functions
9273 to being based on methods.
9274 * The Pod trait has been renamed to Copy.
9275 * jemalloc has been added as the default allocator for types.
9276 * The API for allocating memory has been changed to use proper alignment
9277 and sized deallocation
9278 * Connecting a TcpStream or binding a TcpListener is now based on a
9279 string address and a u16 port. This allows connecting to a hostname as
9281 * The Reader trait now contains a core method, read_at_least(), which
9282 correctly handles many repeated 0-length reads.
9283 * The process-spawning API is now centered around a builder-style
9285 * The :? printing qualifier has been moved from the standard library to
9286 an external libdebug crate.
9287 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9288 have been renamed to Eq/Ord.
9289 * The select/plural methods have been removed from format!. The escapes
9290 for { and } have also changed from \{ and \} to {{ and }},
9292 * The TaskBuilder API has been re-worked to be a true builder, and
9293 extension traits for spawning native/green tasks have been added.
9296 * All breaking changes to the language or libraries now have their
9297 commit message annotated with `[breaking-change]` to allow for easy
9298 discovery of breaking changes.
9299 * The compiler will now try to suggest how to annotate lifetimes if a
9300 lifetime-related error occurs.
9301 * Debug info continues to be improved greatly with general bug fixes and
9302 better support for situations like link time optimization (LTO).
9303 * Usage of syntax extensions when cross-compiling has been fixed.
9304 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9305 -fdata-sections and --gc-sections has been enabled by default
9306 * The compiler is now stricter about where it will load module files
9307 from when a module is declared via `mod foo;`.
9308 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9309 Syntax extensions are now discovered via a "plugin registrar" type
9310 which will be extended in the future to other various plugins.
9311 * Lints have been restructured to allow for dynamically loadable lints.
9312 * A number of rustdoc improvements:
9313 * The HTML output has been visually redesigned.
9314 * Markdown is now powered by hoedown instead of sundown.
9315 * Searching heuristics have been greatly improved.
9316 * The search index has been reduced in size by a great amount.
9317 * Cross-crate documentation via `pub use` has been greatly improved.
9318 * Primitive types are now hyperlinked and documented.
9319 * Documentation has been moved from static.rust-lang.org/doc to
9321 * A new sandbox, play.rust-lang.org, is available for running and
9322 sharing rust code examples on-line.
9323 * Unused attributes are now more robustly warned about.
9324 * The dead_code lint now warns about unused struct fields.
9325 * Cross-compiling to iOS is now supported.
9326 * Cross-compiling to mipsel is now supported.
9327 * Stability attributes are now inherited by default and no longer apply
9328 to intra-crate usage, only inter-crate usage.
9329 * Error message related to non-exhaustive match expressions have been
9333 Version 0.10 (2014-04-03)
9334 =========================
9336 * ~1500 changes, numerous bugfixes
9339 * A new RFC process is now in place for modifying the language.
9340 * Patterns with `@`-pointers have been removed from the language.
9341 * Patterns with unique vectors (`~[T]`) have been removed from the
9343 * Patterns with unique strings (`~str`) have been removed from the
9345 * `@str` has been removed from the language.
9346 * `@[T]` has been removed from the language.
9347 * `@self` has been removed from the language.
9348 * `@Trait` has been removed from the language.
9349 * Headers on `~` allocations which contain `@` boxes inside the type for
9350 reference counting have been removed.
9351 * The semantics around the lifetimes of temporary expressions have changed,
9352 see #3511 and #11585 for more information.
9353 * Cross-crate syntax extensions are now possible, but feature gated. See
9354 #11151 for more information. This includes both `macro_rules!` macros as
9355 well as syntax extensions such as `format!`.
9356 * New lint modes have been added, and older ones have been turned on to be
9358 * Unnecessary parentheses
9361 * Uppercase variables
9362 * Publicly visible private types
9363 * `#[deriving]` with raw pointers
9364 * Unsafe functions can no longer be coerced to closures.
9365 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9366 * The `#[simd]` attribute is now behind a feature gate.
9367 * Visibility is no longer allowed on `extern crate` statements, and
9368 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9369 * Trailing commas are now allowed in argument lists and tuple patterns.
9370 * The `do` keyword has been removed, it is now a reserved keyword.
9371 * Default type parameters have been implemented, but are feature gated.
9372 * Borrowed variables through captures in closures are now considered soundly.
9373 * `extern mod` is now `extern crate`
9374 * The `Freeze` trait has been removed.
9375 * The `Share` trait has been added for types that can be shared among
9377 * Labels in macros are now hygienic.
9378 * Expression/statement macro invocations can be delimited with `{}` now.
9379 * Treatment of types allowed in `static mut` locations has been tweaked.
9380 * The `*` and `.` operators are now overloadable through the `Deref` and
9382 * `~Trait` and `proc` no longer have `Send` bounds by default.
9383 * Partial type hints are now supported with the `_` type marker.
9384 * An `Unsafe` type was introduced for interior mutability. It is now
9385 considered undefined to transmute from `&T` to `&mut T` without using the
9387 * The #[linkage] attribute was implemented for extern statics/functions.
9388 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9389 * `Pod` was renamed to `Copy`.
9392 * The `libextra` library has been removed. It has now been decomposed into
9393 component libraries with smaller and more focused nuggets of
9394 functionality. The full list of libraries can be found on the
9395 documentation index page.
9396 * std: `std::condition` has been removed. All I/O errors are now propagated
9397 through the `Result` type. In order to assist with error handling, a
9398 `try!` macro for unwrapping errors with an early return and a lint for
9399 unused results has been added. See #12039 for more information.
9400 * std: The `vec` module has been renamed to `slice`.
9401 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9402 This will become the only growable vector in the future.
9403 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9404 are now found at `std::io::BufferedReader` instead of
9405 `std::io::buffered::BufferedReader`.
9406 * std: `print` and `println` are no longer in the prelude, the `print!` and
9407 `println!` macros are intended to be used instead.
9408 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9409 attempts to statically prevent cycles.
9410 * std: The standard distribution is adopting the policy of pushing failure
9411 to the user rather than failing in libraries. Many functions (such as
9412 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9413 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9414 deriving mode: `#[deriving(Show)]`.
9415 * std: `ToStr` is now implemented for all types implementing `Show`.
9416 * std: The formatting trait methods now take `&self` instead of `&T`
9417 * std: The `invert()` method on iterators has been renamed to `rev()`
9418 * std: `std::num` has seen a reduction in the genericity of its traits,
9419 consolidating functionality into a few core traits.
9420 * std: Backtraces are now printed on task failure if the environment
9421 variable `RUST_BACKTRACE` is present.
9422 * std: Naming conventions for iterators have been standardized. More details
9423 can be found on the wiki's style guide.
9424 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9425 still implement the function.
9426 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9427 * std: `assert_approx_eq!` has been removed
9428 * std: The `e` and `E` formatting specifiers for floats have been added to
9429 print them in exponential notation.
9430 * std: The `Times` trait has been removed
9431 * std: Indications of variance and opting out of builtin bounds is done
9432 through marker types in `std::kinds::marker` now
9433 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9434 `#[deriving(Hash)]` is now possible.
9435 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9436 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9437 * std: `Chan::new` is now `channel()`.
9438 * std: A new synchronous channel type has been implemented.
9439 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9440 * std: `hashmap` and `trie` have been moved to `libcollections`
9441 * std: `run` has been rolled into `io::process`
9442 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9443 * std: The equality and comparison traits have seen some reorganization.
9444 * std: `rand` has moved to `librand`.
9445 * std: `to_{lower,upper}case` has been implemented for `char`.
9446 * std: Logging has been moved to `liblog`.
9447 * collections: `HashMap` has been rewritten for higher performance and less
9449 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9450 it can be booted manually. The runtime guide has more information and
9452 * native: All I/O functionality except signals has been implemented.
9453 * green: Task spawning with `libgreen` has been optimized with stack caching
9454 and various trimming of code.
9455 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9456 * sync: The `extra::sync` module has been updated to modern rust (and moved
9457 to the `sync` library), tweaking and improving various interfaces while
9458 dropping redundant functionality.
9459 * sync: A new `Barrier` type has been added to the `sync` library.
9460 * sync: An efficient mutex for native and green tasks has been implemented.
9461 * serialize: The `base64` module has seen some improvement. It treats
9462 newlines better, has non-string error values, and has seen general
9464 * fourcc: A `fourcc!` macro was introduced
9465 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9466 hexadecimal literal.
9469 * `rustpkg` has been deprecated and removed from the main repository. Its
9470 replacement, `cargo`, is under development.
9471 * Nightly builds of rust are now available
9472 * The memory usage of rustc has been improved many times throughout this
9474 * The build process supports disabling rpath support for the rustc binary
9476 * Code generation has improved in some cases, giving more information to the
9477 LLVM optimization passes to enable more extensive optimizations.
9478 * Debuginfo compatibility with lldb on OSX has been restored.
9479 * The master branch is now gated on an android bot, making building for
9480 android much more reliable.
9481 * Output flags have been centralized into one `--emit` flag.
9482 * Crate type flags have been centralized into one `--crate-type` flag.
9483 * Codegen flags have been consolidated behind a `-C` flag.
9484 * Linking against outdated crates now has improved error messages.
9485 * Error messages with lifetimes will often suggest how to annotate the
9486 function to fix the error.
9487 * Many more types are documented in the standard library, and new guides
9489 * Many `rustdoc` improvements:
9490 * code blocks are syntax highlighted.
9491 * render standalone markdown files.
9492 * the --test flag tests all code blocks by default.
9493 * exported macros are displayed.
9494 * re-exported types have their documentation inlined at the location of the
9496 * search works across crates that have been rendered to the same output
9500 Version 0.9 (2014-01-09)
9501 ==========================
9503 * ~1800 changes, numerous bugfixes
9506 * The `float` type has been removed. Use `f32` or `f64` instead.
9507 * A new facility for enabling experimental features (feature gating) has
9508 been added, using the crate-level `#[feature(foo)]` attribute.
9509 * Managed boxes (@) are now behind a feature gate
9510 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9511 standard library's `Gc` or `Rc` types instead.
9512 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9513 * Jumping back to the top of a loop is now done with `continue` instead of
9515 * Strings can no longer be mutated through index assignment.
9516 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9517 hash delimiters, as in `r###"foo"###`.
9518 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9520 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9521 * `@fn`s have been removed.
9522 * `do` only works with procs in order to make it obvious what the cost
9524 * Single-element tuple-like structs can no longer be dereferenced to
9525 obtain the inner value. A more comprehensive solution for overloading
9526 the dereference operator will be provided in the future.
9527 * The `#[link(...)]` attribute has been replaced with
9528 `#[crate_id = "name#vers"]`.
9529 * Empty `impl`s must be terminated with empty braces and may not be
9530 terminated with a semicolon.
9531 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9532 no longer has any special meaning.
9533 * The old `fmt!` string formatting macro has been removed.
9534 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9535 `print!` and `println!`.
9536 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9537 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9538 `extern mod foo = "bar"` instead.
9539 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9540 * Macros can have attributes.
9541 * Macros can expand to items with attributes.
9542 * Macros can expand to multiple items.
9543 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9544 * Comments may be nested.
9545 * Values automatically coerce to trait objects they implement, without
9547 * Enum discriminants are no longer an entire word but as small as needed to
9548 contain all the variants. The `repr` attribute can be used to override
9549 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9550 `#[repr(C)]` to match C enums.
9551 * Non-string literals are not allowed in attributes (they never worked).
9552 * The FFI now supports variadic functions.
9553 * Octal numeric literals, as in `0o7777`.
9554 * The `concat!` syntax extension performs compile-time string concatenation.
9555 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9556 removed as Rust no longer uses segmented stacks.
9557 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9558 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9559 not `*`; ignoring remaining fields of a struct is also done with `..`,
9560 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9561 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9562 * `rustc` supports the "system" calling convention, which defaults to the
9563 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9565 * The `type_overflow` lint (default: warn) checks literals for overflow.
9566 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9567 * The `attribute_usage` lint (default: warn) warns about unknown
9569 * The `unknown_features` lint (default: warn) warns about unknown
9571 * The `dead_code` lint (default: warn) checks for dead code.
9572 * Rust libraries can be linked statically to one another
9573 * `#[link_args]` is behind the `link_args` feature gate.
9574 * Native libraries are now linked with `#[link(name = "foo")]`
9575 * Native libraries can be statically linked to a rust crate
9576 (`#[link(name = "foo", kind = "static")]`).
9577 * Native OS X frameworks are now officially supported
9578 (`#[link(name = "foo", kind = "framework")]`).
9579 * The `#[thread_local]` attribute creates thread-local (not task-local)
9580 variables. Currently behind the `thread_local` feature gate.
9581 * The `return` keyword may be used in closures.
9582 * Types that can be copied via a memcpy implement the `Pod` kind.
9583 * The `cfg` attribute can now be used on struct fields and enum variants.
9586 * std: The `option` and `result` API's have been overhauled to make them
9587 simpler, more consistent, and more composable.
9588 * std: The entire `std::io` module has been replaced with one that is
9589 more comprehensive and that properly interfaces with the underlying
9590 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9592 * std: `io::util` contains a number of useful implementations of
9593 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9594 `ZeroReader`, `TeeReader`.
9595 * std: The reference counted pointer type `extra::rc` moved into std.
9596 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9597 just a wrapper around it).
9598 * std: The `Either` type has been removed.
9599 * std: `fmt::Default` can be implemented for any type to provide default
9600 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9601 * std: The `rand` API continues to be tweaked.
9602 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9603 on failure in gdb, is now named `rust_fail`.
9604 * std: The `each_key` and `each_value` methods on `HashMap` have been
9605 replaced by the `keys` and `values` iterators.
9606 * std: Functions dealing with type size and alignment have moved from the
9607 `sys` module to the `mem` module.
9608 * std: The `path` module was written and API changed.
9609 * std: `str::from_utf8` has been changed to cast instead of allocate.
9610 * std: `starts_with` and `ends_with` methods added to vectors via the
9611 `ImmutableEqVector` trait, which is in the prelude.
9612 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9613 if the index is out of bounds.
9614 * std: Task failure no longer propagates between tasks, as the model was
9615 complex, expensive, and incompatible with thread-based tasks.
9616 * std: The `Any` type can be used for dynamic typing.
9617 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9619 * std: Methods that produce iterators generally do not have an `_iter`
9621 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9622 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9623 * std: `util::ignore` renamed to `prelude::drop`.
9624 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9626 * std: `vec::raw` has seen a lot of cleanup and API changes.
9627 * std: The standard library no longer includes any C++ code, and very
9628 minimal C, eliminating the dependency on libstdc++.
9629 * std: Runtime scheduling and I/O functionality has been factored out into
9630 extensible interfaces and is now implemented by two different crates:
9631 libnative, for native threading and I/O; and libgreen, for green threading
9632 and I/O. This paves the way for using the standard library in more limited
9633 embedded environments.
9634 * std: The `comm` module has been rewritten to be much faster, have a
9635 simpler, more consistent API, and to work for both native and green
9637 * std: All libuv dependencies have been moved into the rustuv crate.
9638 * native: New implementations of runtime scheduling on top of OS threads.
9639 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9641 * green: The green thread scheduler and message passing types are almost
9643 * extra: The `flatpipes` module had bitrotted and was removed.
9644 * extra: All crypto functions have been removed and Rust now has a policy of
9645 not reimplementing crypto in the standard library. In the future crypto
9646 will be provided by external crates with bindings to established libraries.
9647 * extra: `c_vec` has been modernized.
9648 * extra: The `sort` module has been removed. Use the `sort` method on
9652 * The `rust` and `rusti` commands have been removed, due to lack of
9654 * `rustdoc` was completely rewritten.
9655 * `rustdoc` can test code examples in documentation.
9656 * `rustpkg` can test packages with the argument, 'test'.
9657 * `rustpkg` supports arbitrary dependencies, including C libraries.
9658 * `rustc`'s support for generating debug info is improved again.
9659 * `rustc` has better error reporting for unbalanced delimiters.
9660 * `rustc`'s JIT support was removed due to bitrot.
9661 * Executables and static libraries can be built with LTO (-Z lto)
9662 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9666 Version 0.8 (2013-09-26)
9667 ============================
9669 * ~2200 changes, numerous bugfixes
9672 * The `for` loop syntax has changed to work with the `Iterator` trait.
9673 * At long last, unwinding works on Windows.
9674 * Default methods are ready for use.
9675 * Many trait inheritance bugs fixed.
9676 * Owned and borrowed trait objects work more reliably.
9677 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9678 * rustc can omit emission of code for the `debug!` macro if it is passed
9680 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9681 for foo.rs, then foo/mod.rs, and will generate an error when both are
9683 * Strings no longer contain trailing nulls. The new `std::c_str` module
9684 provides new mechanisms for converting to C strings.
9685 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9686 * The FFI has been overhauled such that foreign functions are called directly,
9687 instead of through a stack-switching wrapper.
9688 * Calling a foreign function must be done through a Rust function with the
9689 `#[fixed_stack_segment]` attribute.
9690 * The `externfn!` macro can be used to declare both a foreign function and
9691 a `#[fixed_stack_segment]` wrapper at once.
9692 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9693 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9694 * `priv` is disallowed everywhere except for struct fields and enum variants.
9695 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9696 * `ref` bindings in irrefutable patterns work correctly now.
9697 * `char` is now prevented from containing invalid code points.
9698 * Casting to `bool` is no longer allowed.
9699 * `\0` is now accepted as an escape in chars and strings.
9700 * `yield` is a reserved keyword.
9701 * `typeof` is a reserved keyword.
9702 * Crates may be imported by URL with `extern mod foo = "url";`.
9703 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9704 * Static vectors can be initialized with repeating elements,
9705 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9706 * Static structs can be initialized with functional record update,
9707 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9708 * `cfg!` can be used to conditionally execute code based on the crate
9709 configuration, similarly to `#[cfg(...)]`.
9710 * The `unnecessary_qualification` lint detects unneeded module
9711 prefixes (default: allow).
9712 * Arithmetic operations have been implemented on the SIMD types in
9713 `std::unstable::simd`.
9714 * Exchange allocation headers were removed, reducing memory usage.
9715 * `format!` implements a completely new, extensible, and higher-performance
9716 string formatting system. It will replace `fmt!`.
9717 * `print!` and `println!` write formatted strings (using the `format!`
9718 extension) to stdout.
9719 * `write!` and `writeln!` write formatted strings (using the `format!`
9720 extension) to the new Writers in `std::rt::io`.
9721 * The library section in which a function or static is placed may
9722 be specified with `#[link_section = "..."]`.
9723 * The `proto!` syntax extension for defining bounded message protocols
9725 * `macro_rules!` is hygienic for `let` declarations.
9726 * The `#[export_name]` attribute specifies the name of a symbol.
9727 * `unreachable!` can be used to indicate unreachable code, and fails
9731 * std: Transitioned to the new runtime, written in Rust.
9732 * std: Added an experimental I/O library, `rt::io`, based on the new
9734 * std: A new generic `range` function was added to the prelude, replacing
9735 `uint::range` and friends.
9736 * std: `range_rev` no longer exists. Since range is an iterator it can be
9737 reversed with `range(lo, hi).invert()`.
9738 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9739 renamed to `unwrap_or`.
9740 * std: The `iterator` module was renamed to `iter`.
9741 * std: Integral types now support the `checked_add`, `checked_sub`, and
9742 `checked_mul` operations for detecting overflow.
9743 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9745 * std: Methods are standardizing on conventions for casting methods:
9746 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9748 * std: The `CString` type in `c_str` provides new ways to convert to and
9750 * std: `DoubleEndedIterator` can yield elements in two directions.
9751 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9753 * std: `str::from_bytes` renamed to `str::from_utf8`.
9754 * std: `pop_opt` and `shift_opt` methods added to vectors.
9755 * std: The task-local data interface no longer uses @, and keys are
9756 no longer function pointers.
9757 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9758 * std: Added `SharedPort` to `comm`.
9759 * std: `Eq` has a default method for `ne`; only `eq` is required
9761 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9762 is required in implementations.
9763 * std: `is_utf8` performance is improved, impacting many string functions.
9764 * std: `os::MemoryMap` provides cross-platform mmap.
9765 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9766 are not 'in-bounds' are considered undefined.
9767 * std: Many freestanding functions in `vec` removed in favor of methods.
9768 * std: Many freestanding functions on scalar types removed in favor of
9770 * std: Many options to task builders were removed since they don't make
9771 sense in the new scheduler design.
9772 * std: More containers implement `FromIterator` so can be created by the
9774 * std: More complete atomic types in `unstable::atomics`.
9775 * std: `comm::PortSet` removed.
9776 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9777 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9778 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9779 default implementations.
9780 * std: Various `from_str` functions were removed in favor of a generic
9781 `from_str` which is available in the prelude.
9782 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9783 * extra: `dlist`, the doubly-linked list was modernized.
9784 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9785 * extra: Added `glob` module, replacing `std::os::glob`.
9786 * extra: `rope` was removed.
9787 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9788 * extra: `net`, and `timer` were removed. The experimental replacements
9789 are `std::rt::io::net` and `std::rt::io::timer`.
9790 * extra: Iterators implemented for `SmallIntMap`.
9791 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9792 * extra: `SmallIntSet` removed. Use `BitvSet`.
9793 * extra: Performance of JSON parsing greatly improved.
9794 * extra: `semver` updated to SemVer 2.0.0.
9795 * extra: `term` handles more terminals correctly.
9796 * extra: `dbg` module removed.
9797 * extra: `par` module removed.
9798 * extra: `future` was cleaned up, with some method renames.
9799 * extra: Most free functions in `getopts` were converted to methods.
9802 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9803 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9804 similarly to gcc's `--march` flag.
9805 * rustc's performance compiling small crates is much better.
9806 * rustpkg has received many improvements.
9807 * rustpkg supports git tags as package IDs.
9808 * rustpkg builds into target-specific directories so it can be used for
9810 * The number of concurrent test tasks is controlled by the environment
9811 variable RUST_TEST_TASKS.
9812 * The test harness can now report metrics for benchmarks.
9813 * All tools have man pages.
9814 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9815 * The runtime uses jemalloc for allocations.
9816 * Segmented stacks are temporarily disabled as part of the transition to
9817 the new runtime. Stack overflows are possible!
9818 * A new documentation backend, rustdoc_ng, is available for use. It is
9819 still invoked through the normal `rustdoc` command.
9822 Version 0.7 (2013-07-03)
9823 =======================
9825 * ~2000 changes, numerous bugfixes
9828 * `impl`s no longer accept a visibility qualifier. Put them on methods
9830 * The borrow checker has been rewritten with flow-sensitivity, fixing
9831 many bugs and inconveniences.
9832 * The `self` parameter no longer implicitly means `&'self self`,
9833 and can be explicitly marked with a lifetime.
9834 * Overloadable compound operators (`+=`, etc.) have been temporarily
9835 removed due to bugs.
9836 * The `for` loop protocol now requires `for`-iterators to return `bool`
9837 so they compose better.
9838 * The `Durable` trait is replaced with the `'static` bounds.
9839 * Trait default methods work more often.
9840 * Structs with the `#[packed]` attribute have byte alignment and
9841 no padding between fields.
9842 * Type parameters bound by `Copy` must now be copied explicitly with
9844 * It is now illegal to move out of a dereferenced unsafe pointer.
9845 * `Option<~T>` is now represented as a nullable pointer.
9846 * `@mut` does dynamic borrow checks correctly.
9847 * The `main` function is only detected at the topmost level of the crate.
9848 The `#[main]` attribute is still valid anywhere.
9849 * Struct fields may no longer be mutable. Use inherited mutability.
9850 * The `#[no_send]` attribute makes a type that would otherwise be
9852 * The `#[no_freeze]` attribute makes a type that would otherwise be
9854 * Unbounded recursion will abort the process after reaching the limit
9855 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9856 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9857 are never implicitly copyable.
9858 * `#[static_assert]` makes compile-time assertions about static bools.
9859 * At long last, 'argument modes' no longer exist.
9860 * The rarely used `use mod` statement no longer exists.
9863 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9865 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9866 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9868 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9869 and unsuffixed integer literals.
9872 * The `core` crate was renamed to `std`.
9873 * The `std` crate was renamed to `extra`.
9874 * More and improved documentation.
9875 * std: `iterator` module for external iterator objects.
9876 * Many old-style (internal, higher-order function) iterators replaced by
9877 implementations of `Iterator`.
9878 * std: Many old internal vector and string iterators,
9879 incl. `any`, `all`. removed.
9880 * std: The `finalize` method of `Drop` renamed to `drop`.
9881 * std: The `drop` method now takes `&mut self` instead of `&self`.
9882 * std: The prelude no longer re-exports any modules, only types and traits.
9883 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9884 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9885 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9886 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9887 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9888 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9889 * std: Many types implement `Clone`.
9890 * std: `path` type renamed to `Path`.
9891 * std: `mut` module and `Mut` type removed.
9892 * std: Many standalone functions removed in favor of methods and iterators
9893 in `vec`, `str`. In the future methods will also work as functions.
9894 * std: `reinterpret_cast` removed. Use `transmute`.
9895 * std: ascii string handling in `std::ascii`.
9896 * std: `Rand` is implemented for ~/@.
9897 * std: `run` module for spawning processes overhauled.
9898 * std: Various atomic types added to `unstable::atomic`.
9899 * std: Various types implement `Zero`.
9900 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9901 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9902 * std: Added `os::mkdir_recursive`.
9903 * std: Added `os::glob` function performs filesystems globs.
9904 * std: `FuzzyEq` renamed to `ApproxEq`.
9905 * std: `Map` now defines `pop` and `swap` methods.
9906 * std: `Cell` constructors converted to static methods.
9907 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9908 * extra: `flate` module moved from `std` to `extra`.
9909 * extra: `fileinput` module for iterating over a series of files.
9910 * extra: `Complex` number type and `complex` module.
9911 * extra: `Rational` number type and `rational` module.
9912 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9913 * extra: `term` uses terminfo now, is more correct.
9914 * extra: `arc` functions converted to methods.
9915 * extra: Implementation of fixed output size variations of SHA-2.
9918 * `unused_variables` lint mode for unused variables (default: warn).
9919 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9921 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9923 * `dead_assignment` lint mode for unread variables (default: warn).
9924 * `unnecessary_allocation` lint mode detects some heap allocations that are
9925 immediately borrowed so could be written without allocating (default: warn).
9926 * `missing_doc` lint mode (default: allow).
9927 * `unreachable_code` lint mode (default: warn).
9928 * The `rusti` command has been rewritten and a number of bugs addressed.
9929 * rustc outputs in color on more terminals.
9930 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9931 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9932 * Compiling with `-g` will make the binary record information about
9933 dynamic borrowcheck failures for debugging.
9934 * rustdoc has a nicer stylesheet.
9935 * Various improvements to rustdoc.
9936 * Improvements to rustpkg (see the detailed release notes).
9939 Version 0.6 (2013-04-03)
9940 ========================
9942 * ~2100 changes, numerous bugfixes
9945 * The self type parameter in traits is now spelled `Self`
9946 * The `self` parameter in trait and impl methods must now be explicitly
9947 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9948 * Static methods no longer require the `static` keyword and instead
9949 are distinguished by the lack of a `self` parameter
9950 * Replaced the `Durable` trait with the `'static` lifetime
9951 * The old closure type syntax with the trailing sigil has been
9952 removed in favor of the more consistent leading sigil
9953 * `super` is a keyword, and may be prefixed to paths
9954 * Trait bounds are separated with `+` instead of whitespace
9955 * Traits are implemented with `impl Trait for Type`
9956 instead of `impl Type: Trait`
9957 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9958 * The `export` keyword has finally been removed
9959 * The `move` keyword has been removed (see "Semantic changes")
9960 * The interior mutability qualifier on vectors, `[mut T]`, has been
9961 removed. Use `&mut [T]`, etc.
9962 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9963 * `fail` is no longer a keyword. Use `fail!()`
9964 * `assert` is no longer a keyword. Use `assert!()`
9965 * `log` is no longer a keyword. use `debug!`, etc.
9966 * 1-tuples may be represented as `(T,)`
9967 * Struct fields may no longer be `mut`. Use inherited mutability,
9968 `@mut T`, `core::mut` or `core::cell`
9969 * `extern mod { ... }` is no longer valid syntax for foreign
9970 function modules. Use extern blocks: `extern { ... }`
9971 * Newtype enums removed. Use tuple-structs.
9972 * Trait implementations no longer support visibility modifiers
9973 * Pattern matching over vectors improved and expanded
9974 * `const` renamed to `static` to correspond to lifetime name,
9975 and make room for future `static mut` unsafe mutable globals.
9976 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9977 * `Clone` implementations can be automatically generated with
9978 `#[deriving(Clone)]`
9979 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9980 instead of `foo as Bar`.
9981 * Fixed length vector types are now written as `[int, .. 3]`
9982 instead of `[int * 3]`.
9983 * Fixed length vector types can express the length as a constant
9984 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9987 * Types with owned pointers or custom destructors move by default,
9988 eliminating the `move` keyword
9989 * All foreign functions are considered unsafe
9990 * &mut is now unaliasable
9991 * Writes to borrowed @mut pointers are prevented dynamically
9993 * The name of the main function can be customized using #[main]
9994 * The default type of an inferred closure is &fn instead of @fn
9995 * `use` statements may no longer be "chained" - they cannot import
9996 identifiers imported by previous `use` statements
9997 * `use` statements are crate relative, importing from the "top"
9998 of the crate by default. Paths may be prefixed with `super::`
9999 or `self::` to change the search behavior.
10000 * Method visibility is inherited from the implementation declaration
10001 * Structural records have been removed
10002 * Many more types can be used in static items, including enums
10003 'static-lifetime pointers and vectors
10004 * Pattern matching over vectors improved and expanded
10005 * Typechecking of closure types has been overhauled to
10006 improve inference and eliminate unsoundness
10007 * Macros leave scope at the end of modules, unless that module is
10008 tagged with #[macro_escape]
10011 * Added big integers to `std::bigint`
10012 * Removed `core::oldcomm` module
10013 * Added pipe-based `core::comm` module
10014 * Numeric traits have been reorganized under `core::num`
10015 * `vec::slice` finally returns a slice
10016 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10017 * Containers reorganized around traits in `core::container`
10018 * `core::dvec` removed, `~[T]` is a drop-in replacement
10019 * `core::send_map` renamed to `core::hashmap`
10020 * `std::map` removed; replaced with `core::hashmap`
10021 * `std::treemap` reimplemented as an owned balanced tree
10022 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10023 * `core::trie` added as a fast ordered map for integer keys
10024 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10025 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10026 overload the comparison operators, whereas `TotalOrd` is used
10027 by certain container types
10030 * Replaced the 'cargo' package manager with 'rustpkg'
10031 * Added all-purpose 'rust' tool
10032 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10033 * rustc now *attempts* to offer spelling suggestions
10034 * Improved support for ARM and Android
10035 * Preliminary MIPS backend
10036 * Improved foreign function ABI implementation for x86, x86_64
10037 * Various memory usage improvements
10038 * Rust code may be embedded in foreign code under limited circumstances
10039 * Inline assembler supported by new asm!() syntax extension.
10042 Version 0.5 (2012-12-21)
10043 ===========================
10045 * ~900 changes, numerous bugfixes
10048 * Removed `<-` move operator
10049 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10050 * Removed old fixed length vector syntax - `[T]/N`
10051 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10052 * Macros may now expand to items and statements
10053 * `a.b()` is always parsed as a method call, never as a field projection
10054 * `Eq` and `IterBytes` implementations can be automatically generated
10055 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10056 * Removed the special crate language for `.rc` files
10057 * Function arguments may consist of any irrefutable pattern
10060 * `&` and `~` pointers may point to objects
10061 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10062 * Enum variants may be structs
10063 * Destructors can be added to all nominal types with the Drop trait
10064 * Structs and nullary enum variants may be constants
10065 * Values that cannot be implicitly copied are now automatically moved
10066 without writing `move` explicitly
10067 * `&T` may now be coerced to `*T`
10068 * Coercions happen in `let` statements as well as function calls
10069 * `use` statements now take crate-relative paths
10070 * The module and type namespaces have been merged so that static
10071 method names can be resolved under the trait in which they are
10074 * Improved support for language features
10075 * Trait inheritance works in many scenarios
10076 * More support for explicit self arguments in methods - `self`, `&self`
10077 `@self`, and `~self` all generally work as expected
10078 * Static methods work in more situations
10079 * Experimental: Traits may declare default methods for the implementations
10083 * New condition handling system in `core::condition`
10084 * Timsort added to `std::sort`
10085 * New priority queue, `std::priority_queue`
10086 * Pipes for serializable types, `std::flatpipes'
10087 * Serialization overhauled to be trait-based
10088 * Expanded `getopts` definitions
10089 * Moved futures to `std`
10090 * More functions are pure now
10091 * `core::comm` renamed to `oldcomm`. Still deprecated
10092 * `rustdoc` and `cargo` are libraries now
10095 * Added a preliminary REPL, `rusti`
10096 * License changed from MIT to dual MIT/APL2
10099 Version 0.4 (2012-10-15)
10100 ==========================
10102 * ~2000 changes, numerous bugfixes
10105 * All keywords are now strict and may not be used as identifiers anywhere
10106 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10107 'of', 'with', 'to', 'class'.
10108 * Classes are replaced with simpler structs
10109 * Explicit method self types
10110 * `ret` became `return` and `alt` became `match`
10111 * `import` is now `use`; `use is now `extern mod`
10112 * `extern mod { ... }` is now `extern { ... }`
10113 * `use mod` is the recommended way to import modules
10114 * `pub` and `priv` replace deprecated export lists
10115 * The syntax of `match` pattern arms now uses fat arrow (=>)
10116 * `main` no longer accepts an args vector; use `os::args` instead
10119 * Trait implementations are now coherent, ala Haskell typeclasses
10120 * Trait methods may be static
10121 * Argument modes are deprecated
10122 * Borrowed pointers are much more mature and recommended for use
10123 * Strings and vectors in the static region are stored in constant memory
10124 * Typestate was removed
10125 * Resolution rewritten to be more reliable
10126 * Support for 'dual-mode' data structures (freezing and thawing)
10129 * Most binary operators can now be overloaded via the traits in
10131 * `std::net::url` for representing URLs
10132 * Sendable hash maps in `core::send_map`
10133 * `core::task' gained a (currently unsafe) task-local storage API
10136 * An efficient new intertask communication primitive called the pipe,
10137 along with a number of higher-level channel types, in `core::pipes`
10138 * `std::arc`, an atomically reference counted, immutable, shared memory
10140 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10141 * Futures are now based on pipes and sendable
10142 * More robust linked task failure
10143 * Improved task builder API
10146 * Improved error reporting
10147 * Preliminary JIT support
10148 * Preliminary work on precise GC
10149 * Extensive architectural improvements to rustc
10150 * Begun a transition away from buggy C++-based reflection (shape) code to
10151 Rust-based (visitor) code
10152 * All hash functions and tables converted to secure, randomized SipHash
10155 Version 0.3 (2012-07-12)
10156 ========================
10158 * ~1900 changes, numerous bugfixes
10160 * New coding conveniences
10161 * Integer-literal suffix inference
10162 * Per-item control over warnings, errors
10163 * #[cfg(windows)] and #[cfg(unix)] attributes
10164 * Documentation comments
10165 * More compact closure syntax
10166 * 'do' expressions for treating higher-order functions as
10168 * *-patterns (wildcard extended to all constructor fields)
10171 * Name resolution pass and exhaustiveness checker rewritten
10172 * Region pointers and borrow checking supersede alias
10174 * Init-ness checking is now provided by a region-based liveness
10175 pass instead of the typestate pass; same for last-use analysis
10176 * Extensive work on region pointers
10178 * Experimental new language features
10179 * Slices and fixed-size, interior-allocated vectors
10180 * #!-comments for lang versioning, shell execution
10181 * Destructors and iface implementation for classes;
10182 type-parameterized classes and class methods
10183 * 'const' type kind for types that can be used to implement
10184 shared-memory concurrency patterns
10188 * Removal of various obsolete features
10189 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10190 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10192 * Constructs: do-while loops ('do' repurposed), fn binding,
10193 resources (replaced by destructors)
10195 * Compiler reorganization
10196 * Syntax-layer of compiler split into separate crate
10197 * Clang (from LLVM project) integrated into build
10198 * Typechecker split into sub-modules
10201 * New time functions
10202 * Extension methods for many built-in types
10203 * Arc: atomic-refcount read-only / exclusive-use shared cells
10204 * Par: parallel map and search routines
10205 * Extensive work on libuv interface
10206 * Much vector code moved to libraries
10207 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10208 #include, #include_str, #include_bin
10210 * Tool improvements
10211 * Cargo automatically resolves dependencies
10214 Version 0.2 (2012-03-29)
10215 =========================
10217 * >1500 changes, numerous bugfixes
10219 * New docs and doc tooling
10221 * New port: FreeBSD x86_64
10223 * Compilation model enhancements
10224 * Generics now specialized, multiply instantiated
10225 * Functions now inlined across separate crates
10227 * Scheduling, stack and threading fixes
10228 * Noticeably improved message-passing performance
10229 * Explicit schedulers
10233 * Experimental new language features
10234 * Operator overloading
10238 * Various language extensions
10239 * C-callback function types: 'crust fn ...'
10240 * Infinite-loop construct: 'loop { ... }'
10241 * Shorten 'mutable' to 'mut'
10242 * Required mutable-local qualifier: 'let mut ...'
10243 * Basic glob-exporting: 'export foo::*;'
10244 * Alt now exhaustive, 'alt check' for runtime-checked
10245 * Block-function form of 'for' loop, with 'break' and 'ret'.
10248 * AST quasi-quote syntax extension
10249 * Revived libuv interface
10250 * New modules: core::{future, iter}, std::arena
10251 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10252 * Extensive cleanup, regularization in libstd, libcore
10255 Version 0.1 (2012-01-20)
10256 ===============================
10258 * Most language features work, including:
10259 * Unique pointers, unique closures, move semantics
10260 * Interface-constrained generics
10261 * Static interface dispatch
10263 * Multithread task scheduling
10264 * Typestate predicates
10265 * Failure unwinding, destructors
10266 * Pattern matching and destructuring assignment
10267 * Lightweight block-lambda syntax
10268 * Preliminary macro-by-example
10270 * Compiler works with the following configurations:
10271 * Linux: x86 and x86_64 hosts and targets
10272 * macOS: x86 and x86_64 hosts and targets
10273 * Windows: x86 hosts and targets
10275 * Cross compilation / multi-target configuration supported.
10277 * Preliminary API-documentation and package-management tools included.
10281 * Documentation is incomplete.
10283 * Performance is below intended target.
10285 * Standard library APIs are subject to extensive change, reorganization.
10287 * Language-level versioning is not yet operational - future code will
10288 break unexpectedly.