1 Version 1.54.0 (2021-07-29)
2 ============================
5 -----------------------
7 - [You can now use macros for values in key-value attributes.][83366]
8 While a seemingly minor addition on its own, this enables a lot of
9 powerful functionality when combined correctly. Most notably you can
10 now include external documentation in your crate by writing the following.
12 #![doc = include_str!("README.md")]
14 You can also use this to include auto-generated modules:
16 #[path = concat!(env!("OUT_DIR"), "/generated.rs")]
20 - [You can now cast between unsized slice types (and types which contain
21 unsized slices) in `const fn`.][85078]
22 - [You can now use multiple generic lifetimes with `impl Trait` where the
23 lifetimes don't explicitly outlive another.][84701] In code this means
24 that you can now have `impl Trait<'a, 'b>` where as before you could
25 only have `impl Trait<'a, 'b> where 'b: 'a`.
28 -----------------------
30 - [Rustc will now search for custom JSON targets in
31 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
32 directory.][83800] You can find your sysroot directory by running
33 `rustc --print sysroot`.
34 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
35 - [You can now use `#[target_feature]` on safe functions when targeting
36 WebAssembly platforms.][84988]
37 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
38 - [Added tier 3\* support for `bpfel-unknown-none`
39 and `bpfeb-unknown-none`.][79608]
41 \* Refer to Rust's [platform support page][platform-support-doc] for more
42 information on Rust's tiered platform support.
45 -----------------------
47 - [`panic::panic_any` will now `#[track_caller]`.][85745]
48 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
49 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
50 - [The implementations of vendor intrinsics in core::arch have been
51 significantly refactored.][83278] The main user-visible changes are
52 a 50% reduction in the size of libcore.rlib and stricter validation
53 of constant operands passed to intrinsics. The latter is technically
54 a breaking change, but allows Rust to more closely match the C vendor
60 - [`BTreeMap::into_keys`]
61 - [`BTreeMap::into_values`]
62 - [`HashMap::into_keys`]
63 - [`HashMap::into_values`]
65 - [`VecDeque::binary_search`]
66 - [`VecDeque::binary_search_by`]
67 - [`VecDeque::binary_search_by_key`]
68 - [`VecDeque::partition_point`]
71 -----------------------
73 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
74 the dependency graph.][cargo/9520]
75 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
76 in the tree ][cargo/9499]
77 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
78 macro dependencies.][cargo/9488]
79 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
80 This variable points to a directory that integration tests and benches
81 can use as a "scratchpad" for testing filesystem operations.
83 [79608]: https://github.com/rust-lang/rust/pull/79608
84 [84988]: https://github.com/rust-lang/rust/pull/84988
85 [84701]: https://github.com/rust-lang/rust/pull/84701
86 [84072]: https://github.com/rust-lang/rust/pull/84072
87 [85745]: https://github.com/rust-lang/rust/pull/85745
88 [84744]: https://github.com/rust-lang/rust/pull/84744
89 [85078]: https://github.com/rust-lang/rust/pull/85078
90 [84717]: https://github.com/rust-lang/rust/pull/84717
91 [83800]: https://github.com/rust-lang/rust/pull/83800
92 [83366]: https://github.com/rust-lang/rust/pull/83366
93 [83278]: https://github.com/rust-lang/rust/pull/83278
94 [85292]: https://github.com/rust-lang/rust/pull/85292
95 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
96 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
97 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
98 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
99 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
100 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
101 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
102 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
103 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
104 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
105 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
107 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
109 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
111 Version 1.53.0 (2021-06-17)
112 ============================
115 -----------------------
116 - [You can now use unicode for identifiers.][83799] This allows multilingual
117 identifiers but still doesn't allow glyphs that are not considered characters
118 such as `◆` or `🦀`. More specifically you can now use any identifier that
119 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
120 is the same standard as languages like Python, however Rust uses NFC
121 normalization which may be different from other languages.
122 - [You can now specify "or patterns" inside pattern matches.][79278]
123 Previously you could only use `|` (OR) on complete patterns. E.g.
127 matches!(x, Some(1) | Some(2));
129 matches!(x, Some(1 | 2));
131 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
132 has the same semantics as the `:pat` matcher. This is to allow `:pat`
133 to change semantics to being a pattern fragment in a future edition.
136 -----------------------
137 - [Updated the minimum external LLVM version to LLVM 10.][83387]
138 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
139 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
141 \* Refer to Rust's [platform support page][platform-support-doc] for more
142 information on Rust's tiered platform support.
145 -----------------------
146 - [Abort messages will now forward to `android_set_abort_message` on
147 Android platforms when available.][81469]
148 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
149 - [Arrays of any length now implement `IntoIterator`.][84147]
150 Currently calling `.into_iter()` as a method on an array will
151 return `impl Iterator<Item=&T>`, but this may change in a
152 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
153 directly on arrays will provide `impl Iterator<Item=T>` as expected.
154 - [`leading_zeros`, and `trailing_zeros` are now available on all
155 `NonZero` integer types.][84082]
156 - [`{f32, f64}::from_str` now parse and print special values
157 (`NaN`, `-0`) according to IEEE RFC 754.][78618]
158 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
159 - [Add the `BITS` associated constant to all numeric types.][82565]
163 - [`AtomicBool::fetch_update`]
164 - [`AtomicPtr::fetch_update`]
165 - [`BTreeMap::retain`]
166 - [`BTreeSet::retain`]
167 - [`BufReader::seek_relative`]
168 - [`DebugStruct::non_exhaustive`]
171 - [`Duration::is_zero`]
172 - [`Duration::saturating_add`]
173 - [`Duration::saturating_mul`]
174 - [`Duration::saturating_sub`]
175 - [`ErrorKind::Unsupported`]
177 - [`Ordering::is_eq`]
178 - [`Ordering::is_ge`]
179 - [`Ordering::is_gt`]
180 - [`Ordering::is_le`]
181 - [`Ordering::is_lt`]
182 - [`Ordering::is_ne`]
183 - [`OsStr::is_ascii`]
184 - [`OsStr::make_ascii_lowercase`]
185 - [`OsStr::make_ascii_uppercase`]
186 - [`OsStr::to_ascii_lowercase`]
187 - [`OsStr::to_ascii_uppercase`]
188 - [`Peekable::peek_mut`]
189 - [`Rc::decrement_strong_count`]
190 - [`Rc::increment_strong_count`]
191 - [`Vec::extend_from_within`]
192 - [`array::from_mut`]
193 - [`array::from_ref`]
194 - [`cmp::max_by_key`]
196 - [`cmp::min_by_key`]
198 - [`f32::is_subnormal`]
199 - [`f64::is_subnormal`]
202 -----------------------
203 - [Cargo now supports git repositories where the default `HEAD` branch is not
204 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
205 which can handle default branches correctly.
206 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
207 - [The `authors` field is no longer included in `Cargo.toml` for new
208 projects.][cargo/9282]
211 -----------------------
212 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
213 without hyperlinks.][81764]
217 - [Implement token-based handling of attributes during expansion][82608]
218 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
219 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
220 to confusion and potential security vulnerabilities and [is no
221 longer recommended][ietf6943].
222 - [The added `BITS` constant may conflict with external definitions.][85667]
223 In particular, this was known to be a problem in the `lexical-core` crate,
224 but they have published fixes for semantic versions 0.4 through 0.7. To
225 update this dependency alone, use `cargo update -p lexical-core`.
226 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
230 These changes provide no direct user facing benefits, but represent significant
231 improvements to the internals and overall performance of rustc and
234 - [Rework the `std::sys::windows::alloc` implementation.][83065]
235 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
236 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
237 - [Rework rustdoc const type][82873]
239 [85667]: https://github.com/rust-lang/rust/pull/85667
240 [83386]: https://github.com/rust-lang/rust/pull/83386
241 [82771]: https://github.com/rust-lang/rust/pull/82771
242 [84147]: https://github.com/rust-lang/rust/pull/84147
243 [84082]: https://github.com/rust-lang/rust/pull/84082
244 [83799]: https://github.com/rust-lang/rust/pull/83799
245 [83681]: https://github.com/rust-lang/rust/pull/83681
246 [83652]: https://github.com/rust-lang/rust/pull/83652
247 [83387]: https://github.com/rust-lang/rust/pull/83387
248 [82873]: https://github.com/rust-lang/rust/pull/82873
249 [82864]: https://github.com/rust-lang/rust/pull/82864
250 [82608]: https://github.com/rust-lang/rust/pull/82608
251 [82565]: https://github.com/rust-lang/rust/pull/82565
252 [80525]: https://github.com/rust-lang/rust/pull/80525
253 [79278]: https://github.com/rust-lang/rust/pull/79278
254 [78618]: https://github.com/rust-lang/rust/pull/78618
255 [77704]: https://github.com/rust-lang/rust/pull/77704
256 [83941]: https://github.com/rust-lang/rust/pull/83941
257 [83065]: https://github.com/rust-lang/rust/pull/83065
258 [81764]: https://github.com/rust-lang/rust/pull/81764
259 [81469]: https://github.com/rust-lang/rust/pull/81469
260 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
261 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
262 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
263 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
264 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
265 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
266 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
267 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
268 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
269 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
270 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
271 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
272 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
273 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
274 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
275 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
276 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
277 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
278 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
279 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
280 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
281 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
282 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
283 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
284 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
285 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
286 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
287 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
288 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
289 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
290 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
291 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
292 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
293 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
294 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
295 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
296 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
297 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
298 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
299 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
300 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
301 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
304 Version 1.52.1 (2021-05-10)
305 ============================
307 This release disables incremental compilation, unless the user has explicitly
308 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
310 This is due to the widespread, and frequently occuring, breakage encountered by
311 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
312 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
313 newly added incremental verification are still present in past stable versions,
314 and are not yet fixed on any channel. These bugs can lead to miscompilation of
317 These problems only affect incremental builds, so release builds with Cargo
318 should not be affected unless the user has explicitly opted into incremental.
319 Debug and check builds are affected.
321 See [84970] for more details.
323 [84970]: https://github.com/rust-lang/rust/issues/84970
325 Version 1.52.0 (2021-05-06)
326 ============================
330 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
331 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
332 is allowed by default, and may become a warning or hard error in a
334 - [You can now cast mutable references to arrays to a pointer of the same type as
339 - [Upgraded the default LLVM to LLVM 12.][81451]
341 Added tier 3\* support for the following targets.
343 - [`s390x-unknown-linux-musl`][82166]
344 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
345 - [`powerpc-unknown-openbsd`][82733]
347 \* Refer to Rust's [platform support page][platform-support-doc] for more
348 information on Rust's tiered platform support.
352 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
353 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
354 - [`Arc<impl Error>` now implements `error::Error`.][80553]
355 - [All integer division and remainder operations are now `const`.][80962]
359 - [`Arguments::as_str`]
361 - [`char::REPLACEMENT_CHARACTER`]
362 - [`char::UNICODE_VERSION`]
363 - [`char::decode_utf16`]
364 - [`char::from_digit`]
365 - [`char::from_u32_unchecked`]
367 - [`slice::partition_point`]
368 - [`str::rsplit_once`]
369 - [`str::split_once`]
371 The following previously stable APIs are now `const`.
374 - [`char::len_utf16`]
375 - [`char::to_ascii_uppercase`]
376 - [`char::to_ascii_lowercase`]
377 - [`char::eq_ignore_ascii_case`]
378 - [`u8::to_ascii_uppercase`]
379 - [`u8::to_ascii_lowercase`]
380 - [`u8::eq_ignore_ascii_case`]
384 - [Rustdoc lints are now treated as a tool lint, meaning that
385 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
386 Using the old style is still allowed, and will become a warning in
388 - [Rustdoc now supports argument files.][82261]
389 - [Rustdoc now generates smart punctuation for documentation.][79423]
390 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
398 - [You can now pass multiple filters to tests.][81356] E.g.
399 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
400 - [Rustup now distributes PDB symbols for the `std` library on Windows,
401 allowing you to see `std` symbols when debugging.][82218]
405 These changes provide no direct user facing benefits, but represent significant
406 improvements to the internals and overall performance of rustc and
409 - [Check the result cache before the DepGraph when ensuring queries][81855]
410 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
411 - [Only store a LocalDefId in some HIR nodes][81611]
412 - [Store HIR attributes in a side table][79519]
416 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
417 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
418 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
419 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
420 languages in code blocks.][78429]
421 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
422 - [Changes in how proc macros handle whitespace may lead to panics when used
423 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
424 - [Turn `#[derive]` into a regular macro attribute][79078]
426 [84136]: https://github.com/rust-lang/rust/issues/84136
427 [80763]: https://github.com/rust-lang/rust/pull/80763
428 [82166]: https://github.com/rust-lang/rust/pull/82166
429 [82121]: https://github.com/rust-lang/rust/pull/82121
430 [81879]: https://github.com/rust-lang/rust/pull/81879
431 [82261]: https://github.com/rust-lang/rust/pull/82261
432 [82218]: https://github.com/rust-lang/rust/pull/82218
433 [82216]: https://github.com/rust-lang/rust/pull/82216
434 [82202]: https://github.com/rust-lang/rust/pull/82202
435 [81855]: https://github.com/rust-lang/rust/pull/81855
436 [81766]: https://github.com/rust-lang/rust/pull/81766
437 [81744]: https://github.com/rust-lang/rust/pull/81744
438 [81611]: https://github.com/rust-lang/rust/pull/81611
439 [81479]: https://github.com/rust-lang/rust/pull/81479
440 [81451]: https://github.com/rust-lang/rust/pull/81451
441 [81356]: https://github.com/rust-lang/rust/pull/81356
442 [80962]: https://github.com/rust-lang/rust/pull/80962
443 [80553]: https://github.com/rust-lang/rust/pull/80553
444 [80527]: https://github.com/rust-lang/rust/pull/80527
445 [79519]: https://github.com/rust-lang/rust/pull/79519
446 [79423]: https://github.com/rust-lang/rust/pull/79423
447 [79208]: https://github.com/rust-lang/rust/pull/79208
448 [78429]: https://github.com/rust-lang/rust/pull/78429
449 [82733]: https://github.com/rust-lang/rust/pull/82733
450 [82594]: https://github.com/rust-lang/rust/pull/82594
451 [79078]: https://github.com/rust-lang/rust/pull/79078
452 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
453 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
454 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
455 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
456 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
457 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
458 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
459 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
460 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
461 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
462 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
463 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
464 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
465 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
466 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
467 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
468 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
469 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
470 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
471 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
472 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
473 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
475 Version 1.51.0 (2021-03-25)
476 ============================
480 - [You can now parameterize items such as functions, traits, and `struct`s by constant
481 values in addition to by types and lifetimes.][79135] Also known as "const generics"
482 E.g. you can now write the following. Note: Only values of primitive integers,
483 `bool`, or `char` types are currently permitted.
485 struct GenericArray<T, const LENGTH: usize> {
489 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
490 const fn last(&self) -> Option<&T> {
494 Some(&self.inner[LENGTH - 1])
504 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
505 This option controls whether debug information is split across multiple files
506 or packed into a single file. **Note** This option is unstable on other platforms.
507 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
508 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
509 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
510 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
512 \* Refer to Rust's [platform support page][platform-support-doc] for more
513 information on Rust's tiered platform support.
518 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
519 - [`str` now implements `AsMut<str>`.][80279]
520 - [`u64` and `u128` now implement `From<char>`.][79502]
521 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
522 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
523 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
524 - [`io::Empty` now implements `io::Seek`.][78044]
525 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
526 `T: ?Sized` types.][80764]
527 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
533 - [`Arc::decrement_strong_count`]
534 - [`Arc::increment_strong_count`]
535 - [`Once::call_once_force`]
536 - [`Peekable::next_if_eq`]
537 - [`Peekable::next_if`]
538 - [`Seek::stream_position`]
539 - [`array::IntoIter`]
540 - [`panic::panic_any`]
542 - [`ptr::addr_of_mut!`]
543 - [`slice::fill_with`]
544 - [`slice::split_inclusive_mut`]
545 - [`slice::split_inclusive`]
546 - [`slice::strip_prefix`]
547 - [`slice::strip_suffix`]
548 - [`str::split_inclusive`]
549 - [`sync::OnceState`]
551 - [`VecDeque::range`]
552 - [`VecDeque::range_mut`]
556 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
557 codegen option.][cargo/9112]
558 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
559 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
560 to avoid unifying features of dependencies where that unification could be unwanted.
561 Such as using the same dependency with a `std` feature in a build scripts and
562 proc-macros, while using the `no-std` feature in the final binary. See the
563 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
568 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
569 - [You can now provide a `--default-theme` flag which sets the default theme to use for
570 documentation.][79642]
572 Various improvements to intra-doc links:
574 - [You can link to non-path primitives such as `slice`.][80181]
575 - [You can link to associated items.][74489]
576 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
580 - [You can now pass `--include-ignored` to tests (e.g. with
581 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
586 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
587 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
589 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
590 for the distributed artifacts.][81521]
591 - `armv5te-unknown-linux-gnueabi`
592 - `sparc64-unknown-linux-gnu`
593 - `thumbv7neon-unknown-linux-gnueabihf`
594 - `armv7-unknown-linux-gnueabi`
595 - `x86_64-unknown-linux-gnux32`
596 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
601 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
603 [79135]: https://github.com/rust-lang/rust/pull/79135
604 [74489]: https://github.com/rust-lang/rust/pull/74489
605 [76934]: https://github.com/rust-lang/rust/pull/76934
606 [79570]: https://github.com/rust-lang/rust/pull/79570
607 [80181]: https://github.com/rust-lang/rust/pull/80181
608 [79642]: https://github.com/rust-lang/rust/pull/79642
609 [80945]: https://github.com/rust-lang/rust/pull/80945
610 [80279]: https://github.com/rust-lang/rust/pull/80279
611 [80053]: https://github.com/rust-lang/rust/pull/80053
612 [79502]: https://github.com/rust-lang/rust/pull/79502
613 [75180]: https://github.com/rust-lang/rust/pull/75180
614 [79135]: https://github.com/rust-lang/rust/pull/79135
615 [81521]: https://github.com/rust-lang/rust/pull/81521
616 [80968]: https://github.com/rust-lang/rust/pull/80968
617 [80959]: https://github.com/rust-lang/rust/pull/80959
618 [80718]: https://github.com/rust-lang/rust/pull/80718
619 [80653]: https://github.com/rust-lang/rust/pull/80653
620 [80579]: https://github.com/rust-lang/rust/pull/80579
621 [79998]: https://github.com/rust-lang/rust/pull/79998
622 [78044]: https://github.com/rust-lang/rust/pull/78044
623 [81455]: https://github.com/rust-lang/rust/pull/81455
624 [80764]: https://github.com/rust-lang/rust/pull/80764
625 [80749]: https://github.com/rust-lang/rust/pull/80749
626 [80662]: https://github.com/rust-lang/rust/pull/80662
627 [79134]: https://github.com/rust-lang/rust/pull/79134
628 [80966]: https://github.com/rust-lang/rust/pull/80966
629 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
630 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
631 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
632 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
633 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
634 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
635 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
636 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
637 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
638 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
639 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
640 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
641 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
642 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
643 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
644 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
645 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
646 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
647 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
648 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
649 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
650 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
651 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
653 Version 1.50.0 (2021-02-11)
654 ============================
657 -----------------------
658 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
659 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
660 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
663 -----------------------
664 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
665 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
666 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
667 - [Dropped support for all cloudabi targets.][78439]
669 \* Refer to Rust's [platform support page][platform-support-doc] for more
670 information on Rust's tiered platform support.
673 -----------------------
675 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
676 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
677 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
678 This value cannot be a valid file descriptor, and now means `Option<File>` takes
679 up the same amount of space as `File`.
685 - [`btree_map::Entry::or_insert_with_key`]
688 - [`hash_map::Entry::or_insert_with_key`]
692 - [`UnsafeCell::get_mut`]
694 The following previously stable methods are now `const`.
696 - [`IpAddr::is_ipv4`]
697 - [`IpAddr::is_ipv6`]
698 - [`IpAddr::is_unspecified`]
699 - [`IpAddr::is_loopback`]
700 - [`IpAddr::is_multicast`]
701 - [`Ipv4Addr::octets`]
702 - [`Ipv4Addr::is_loopback`]
703 - [`Ipv4Addr::is_private`]
704 - [`Ipv4Addr::is_link_local`]
705 - [`Ipv4Addr::is_multicast`]
706 - [`Ipv4Addr::is_broadcast`]
707 - [`Ipv4Addr::is_documentation`]
708 - [`Ipv4Addr::to_ipv6_compatible`]
709 - [`Ipv4Addr::to_ipv6_mapped`]
710 - [`Ipv6Addr::segments`]
711 - [`Ipv6Addr::is_unspecified`]
712 - [`Ipv6Addr::is_loopback`]
713 - [`Ipv6Addr::is_multicast`]
714 - [`Ipv6Addr::to_ipv4`]
717 - [`Layout::from_size_align`]
718 - `pow` for all integer types.
719 - `checked_pow` for all integer types.
720 - `saturating_pow` for all integer types.
721 - `wrapping_pow` for all integer types.
722 - `next_power_of_two` for all unsigned integer types.
723 - `checked_next_power_of_two` for all unsigned integer types.
726 -----------------------
728 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
729 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
730 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
731 contents of that directory for changes.][cargo/8973]
732 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
737 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
738 - [Running tests will now print the total time taken to execute.][75752]
743 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
744 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
745 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
746 unhygenic `macro_rules!` macros.][79472]
747 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
748 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
749 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
750 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
751 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
752 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
754 [74989]: https://github.com/rust-lang/rust/pull/74989
755 [79261]: https://github.com/rust-lang/rust/pull/79261
756 [79896]: https://github.com/rust-lang/rust/pull/79896
757 [79484]: https://github.com/rust-lang/rust/pull/79484
758 [79472]: https://github.com/rust-lang/rust/pull/79472
759 [79270]: https://github.com/rust-lang/rust/pull/79270
760 [79003]: https://github.com/rust-lang/rust/pull/79003
761 [78864]: https://github.com/rust-lang/rust/pull/78864
762 [78636]: https://github.com/rust-lang/rust/pull/78636
763 [78439]: https://github.com/rust-lang/rust/pull/78439
764 [78343]: https://github.com/rust-lang/rust/pull/78343
765 [78296]: https://github.com/rust-lang/rust/pull/78296
766 [78068]: https://github.com/rust-lang/rust/pull/78068
767 [75752]: https://github.com/rust-lang/rust/pull/75752
768 [74699]: https://github.com/rust-lang/rust/pull/74699
769 [78142]: https://github.com/rust-lang/rust/pull/78142
770 [77484]: https://github.com/rust-lang/rust/pull/77484
771 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
772 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
773 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
774 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
775 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
776 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
777 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
778 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
779 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
780 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
781 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
782 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
783 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
784 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
785 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
786 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
787 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
788 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
789 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
790 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
791 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
792 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
793 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
794 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
795 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
796 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
797 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
798 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
799 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
800 [`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
801 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
802 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
803 [`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
804 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
807 Version 1.49.0 (2020-12-31)
808 ============================
811 -----------------------
813 - [Unions can now implement `Drop`, and you can now have a field in a union
814 with `ManuallyDrop<T>`.][77547]
815 - [You can now cast uninhabited enums to integers.][76199]
816 - [You can now bind by reference and by move in patterns.][76119] This
817 allows you to selectively borrow individual components of a type. E.g.
825 let person = Person {
826 name: String::from("Alice"),
830 // `name` is moved out of person, but `age` is referenced.
831 let Person { name, ref age } = person;
832 println!("{} {}", name, age);
836 -----------------------
838 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
839 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
840 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
841 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
842 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
843 - [Output from threads spawned in tests is now captured.][78227]
844 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
846 \* Refer to Rust's [platform support page][platform-support-doc] for more
847 information on Rust's tiered platform support.
850 -----------------------
852 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
853 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
858 - [`slice::select_nth_unstable`]
859 - [`slice::select_nth_unstable_by`]
860 - [`slice::select_nth_unstable_by_key`]
862 The following previously stable methods are now `const`.
865 - [`Poll::is_pending`]
868 -----------------------
869 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
870 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
871 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
872 variable will be set if the crate being built is one the user selected to build, either
873 with `-p` or through defaults.
874 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
880 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
881 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
882 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
883 Previously such invalid or unused attributes could be ignored.
884 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
885 read [this post about the changes][rustdoc-ws-post] for more details.
886 - [Trait bounds are no longer inferred for associated types.][79904]
890 These changes provide no direct user facing benefits, but represent significant
891 improvements to the internals and overall performance of rustc and
894 - [rustc's internal crates are now compiled using the `initial-exec` Thread
895 Local Storage model.][78201]
896 - [Calculate visibilities once in resolve.][78077]
897 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
898 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
901 [75991]: https://github.com/rust-lang/rust/pull/75991
902 [78951]: https://github.com/rust-lang/rust/pull/78951
903 [78848]: https://github.com/rust-lang/rust/pull/78848
904 [78746]: https://github.com/rust-lang/rust/pull/78746
905 [78376]: https://github.com/rust-lang/rust/pull/78376
906 [78228]: https://github.com/rust-lang/rust/pull/78228
907 [78227]: https://github.com/rust-lang/rust/pull/78227
908 [78201]: https://github.com/rust-lang/rust/pull/78201
909 [78109]: https://github.com/rust-lang/rust/pull/78109
910 [78077]: https://github.com/rust-lang/rust/pull/78077
911 [77997]: https://github.com/rust-lang/rust/pull/77997
912 [77703]: https://github.com/rust-lang/rust/pull/77703
913 [77547]: https://github.com/rust-lang/rust/pull/77547
914 [77015]: https://github.com/rust-lang/rust/pull/77015
915 [76199]: https://github.com/rust-lang/rust/pull/76199
916 [76119]: https://github.com/rust-lang/rust/pull/76119
917 [75914]: https://github.com/rust-lang/rust/pull/75914
918 [79004]: https://github.com/rust-lang/rust/pull/79004
919 [78676]: https://github.com/rust-lang/rust/pull/78676
920 [79904]: https://github.com/rust-lang/rust/issues/79904
921 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
922 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
923 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
924 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
925 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
926 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
927 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
928 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
929 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
930 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
931 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
933 Version 1.48.0 (2020-11-19)
934 ==========================
939 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
940 is still rejected *semantically*, but can now be parsed by procedural macros.
944 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
945 `rustc` whether to link its own C runtime and libraries or to rely on a external
946 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
947 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
948 Note: If you're using cargo you must explicitly pass the `--target` flag.
949 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
951 \* Refer to Rust's [platform support page][platform-support-doc] for more
952 information on Rust's tiered platform support.
956 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
957 and `&Stderr`.][76275]
958 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
959 - [The `matches!` macro now supports having a trailing comma.][74880]
960 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
961 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
965 - [`slice::as_ptr_range`]
966 - [`slice::as_mut_ptr_range`]
967 - [`VecDeque::make_contiguous`]
968 - [`future::pending`]
971 The following previously stable methods are now `const fn`'s:
973 - [`Option::is_some`]
974 - [`Option::is_none`]
979 - [`Ordering::reverse`]
987 - [You can now link to items in `rustdoc` using the intra-doc link
988 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
989 a link to `std::future`'s documentation. See ["Linking to items by
990 name"][intradoc-links] for more information.
991 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
992 when searching through `rustdoc`'s UI.][75740]
996 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
997 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
998 promoted to `'static` lifetime any more inside `const fn`s.
999 - [Associated type bindings on trait objects are now verified to meet the bounds
1000 declared on the trait when checking that they implement the trait.][27675]
1001 - [When trait bounds on associated types or opaque types are ambiguous, the
1002 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1003 - [Fixed recursive nonterminals not being expanded in macros during
1004 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1005 correctly handling recursive nonterminal tokens.
1006 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1007 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1008 in places where they have no effect.][73461]
1009 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1010 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1011 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1012 disallow zero-initialization.][71274]
1013 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1014 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1015 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1016 see the [`catch_unwind`] documentation for further information.
1022 These changes provide no direct user facing benefits, but represent significant
1023 improvements to the internals and overall performance of rustc and
1026 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1027 You can continue building with `make` by setting `ninja=false` in
1029 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1030 - [Made `ensure_sufficient_stack()` non-generic][76680]
1032 [78143]: https://github.com/rust-lang/rust/issues/78143
1033 [76680]: https://github.com/rust-lang/rust/pull/76680/
1034 [76030]: https://github.com/rust-lang/rust/pull/76030/
1035 [70212]: https://github.com/rust-lang/rust/pull/70212/
1036 [27675]: https://github.com/rust-lang/rust/issues/27675/
1037 [54121]: https://github.com/rust-lang/rust/issues/54121/
1038 [71274]: https://github.com/rust-lang/rust/pull/71274/
1039 [77386]: https://github.com/rust-lang/rust/pull/77386/
1040 [77153]: https://github.com/rust-lang/rust/pull/77153/
1041 [77055]: https://github.com/rust-lang/rust/pull/77055/
1042 [76275]: https://github.com/rust-lang/rust/pull/76275/
1043 [76310]: https://github.com/rust-lang/rust/pull/76310/
1044 [76420]: https://github.com/rust-lang/rust/pull/76420/
1045 [76158]: https://github.com/rust-lang/rust/pull/76158/
1046 [75857]: https://github.com/rust-lang/rust/pull/75857/
1047 [75585]: https://github.com/rust-lang/rust/pull/75585/
1048 [75740]: https://github.com/rust-lang/rust/pull/75740/
1049 [75502]: https://github.com/rust-lang/rust/pull/75502/
1050 [74880]: https://github.com/rust-lang/rust/pull/74880/
1051 [74922]: https://github.com/rust-lang/rust/pull/74922/
1052 [74430]: https://github.com/rust-lang/rust/pull/74430/
1053 [74194]: https://github.com/rust-lang/rust/pull/74194/
1054 [73461]: https://github.com/rust-lang/rust/pull/73461/
1055 [73166]: https://github.com/rust-lang/rust/pull/73166/
1056 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1057 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1058 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1059 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1060 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1061 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1062 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1063 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1064 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1065 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1066 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1067 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1068 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1069 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1070 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1073 Version 1.47.0 (2020-10-08)
1074 ==========================
1078 - [Closures will now warn when not used.][74869]
1082 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1083 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1085 - [Upgraded to LLVM 11.][73526]
1086 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1087 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1088 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1090 \* Refer to Rust's [platform support page][platform-support-doc] for more
1091 information on Rust's tiered platform support.
1095 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1096 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1097 those of length less than 33.][74060]
1098 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1099 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1100 `PartialEq`, and `PartialOrd`.][73583]
1104 - [`Ident::new_raw`]
1105 - [`Range::is_empty`]
1106 - [`RangeInclusive::is_empty`]
1107 - [`Result::as_deref`]
1108 - [`Result::as_deref_mut`]
1110 - [`pointer::offset_from`]
1114 The following previously stable APIs have now been made const.
1116 - [The `new` method for all `NonZero` integers.][73858]
1117 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1118 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1119 methods for all integers.][73858]
1120 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1121 signed integers.][73858]
1122 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1123 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1124 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1125 `is_ascii_control` methods for `char` and `u8`.][73858]
1129 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1130 You can override this by setting the following in your `Cargo.toml`.
1132 [profile.release.build-override]
1135 - [`cargo-help` will now display man pages for commands rather just the
1136 `--help` text.][cargo/8456]
1137 - [`cargo-metadata` now emits a `test` field indicating if a target has
1138 tests enabled.][cargo/8478]
1139 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1140 - [`cargo-publish` will now use an alternative registry by default if it's the
1141 only registry specified in `package.publish`.][cargo/8571]
1145 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1146 type based search.][75366]
1147 - [Added the Ayu theme to rustdoc.][71237]
1151 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1152 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1153 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1154 help to preserve more span information.][73084] These changes may cause
1155 compiliation errors if your macro was unhygenic or didn't correctly handle
1157 - [Moved support for the CloudABI target to tier 3.][75568]
1158 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1159 - [Added the `rustc-docs` component.][75560] This allows you to install
1160 and read the documentation for the compiler internal APIs. (Currently only
1161 available for `x86_64-unknown-linux-gnu`.)
1166 - [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.
1168 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1169 [75048]: https://github.com/rust-lang/rust/pull/75048/
1170 [74163]: https://github.com/rust-lang/rust/pull/74163/
1171 [71237]: https://github.com/rust-lang/rust/pull/71237/
1172 [74869]: https://github.com/rust-lang/rust/pull/74869/
1173 [73858]: https://github.com/rust-lang/rust/pull/73858/
1174 [75716]: https://github.com/rust-lang/rust/pull/75716/
1175 [75908]: https://github.com/rust-lang/rust/pull/75908/
1176 [75516]: https://github.com/rust-lang/rust/pull/75516/
1177 [75560]: https://github.com/rust-lang/rust/pull/75560/
1178 [75568]: https://github.com/rust-lang/rust/pull/75568/
1179 [75366]: https://github.com/rust-lang/rust/pull/75366/
1180 [75204]: https://github.com/rust-lang/rust/pull/75204/
1181 [74650]: https://github.com/rust-lang/rust/pull/74650/
1182 [74419]: https://github.com/rust-lang/rust/pull/74419/
1183 [73964]: https://github.com/rust-lang/rust/pull/73964/
1184 [74021]: https://github.com/rust-lang/rust/pull/74021/
1185 [74060]: https://github.com/rust-lang/rust/pull/74060/
1186 [73893]: https://github.com/rust-lang/rust/pull/73893/
1187 [73526]: https://github.com/rust-lang/rust/pull/73526/
1188 [73583]: https://github.com/rust-lang/rust/pull/73583/
1189 [73084]: https://github.com/rust-lang/rust/pull/73084/
1190 [73197]: https://github.com/rust-lang/rust/pull/73197/
1191 [72488]: https://github.com/rust-lang/rust/pull/72488/
1192 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1193 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1194 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1195 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1196 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1197 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1198 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1199 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1200 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1201 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1202 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1203 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1204 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1205 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1206 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1209 Version 1.46.0 (2020-08-27)
1210 ==========================
1214 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1215 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1216 const functions.][73862]
1217 - [The `#[track_caller]` attribute can now be added to functions to use the
1218 function's caller's location information for panic messages.][72445]
1219 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1220 `x.0.0` over `(x.0).0`.
1221 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1222 You currently can't use `mem::transmute` in constant functions.
1226 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1227 - [Enabled static "Position Independent Executables" by default
1228 for `x86_64-unknown-linux-musl`.][70740]
1232 - [`mem::forget` is now a `const fn`.][73887]
1233 - [`String` now implements `From<char>`.][73466]
1234 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1235 integer types.][73032]
1236 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1237 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1238 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1239 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1240 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1241 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1246 - [`vec::Drain::as_slice`]
1250 Added a number of new environment variables that are now available when
1251 compiling your crate.
1253 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1254 the specific binary being compiled and the name of the crate.
1255 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1256 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1260 - [The target configuration option `abi_blacklist` has been renamed
1261 to `unsupported_abis`.][74150] The old name will still continue to work.
1262 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1263 This was previously accepted but will become a hard error in a future release.
1264 - [Rustc will fail to compile if you have a struct with
1265 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1267 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1268 ensure that spans have the correct information, and may cause breakage if you
1269 were relying on receiving spans with dummy information.
1270 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1271 a legacy installer that was replaced by a MSI installer a few years ago but
1272 was still being built.
1273 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1274 - [Rustc will no longer accept overlapping trait implementations that only
1275 differ in how the lifetime was bound.][72493]
1276 - [Rustc now correctly relates the lifetime of an existential associated
1277 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1278 you to pass a shorter lifetime than expected.
1279 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1280 The library will need to be installed for `rustc` to work, even though we
1281 expect it to be already available on most systems.
1282 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1284 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1285 exact output returned by rustc's pretty printing is an unstable
1286 implementation detail: we recommend any macro relying on it to switch to a
1287 more robust parsing system.
1289 [75453]: https://github.com/rust-lang/rust/issues/75453/
1290 [74820]: https://github.com/rust-lang/rust/issues/74820/
1291 [74420]: https://github.com/rust-lang/rust/issues/74420/
1292 [74109]: https://github.com/rust-lang/rust/pull/74109/
1293 [74150]: https://github.com/rust-lang/rust/pull/74150/
1294 [73862]: https://github.com/rust-lang/rust/pull/73862/
1295 [73887]: https://github.com/rust-lang/rust/pull/73887/
1296 [73466]: https://github.com/rust-lang/rust/pull/73466/
1297 [73516]: https://github.com/rust-lang/rust/pull/73516/
1298 [73293]: https://github.com/rust-lang/rust/pull/73293/
1299 [73007]: https://github.com/rust-lang/rust/pull/73007/
1300 [73032]: https://github.com/rust-lang/rust/pull/73032/
1301 [72920]: https://github.com/rust-lang/rust/pull/72920/
1302 [72569]: https://github.com/rust-lang/rust/pull/72569/
1303 [72583]: https://github.com/rust-lang/rust/pull/72583/
1304 [72584]: https://github.com/rust-lang/rust/pull/72584/
1305 [72717]: https://github.com/rust-lang/rust/pull/72717/
1306 [72437]: https://github.com/rust-lang/rust/pull/72437/
1307 [72445]: https://github.com/rust-lang/rust/pull/72445/
1308 [72486]: https://github.com/rust-lang/rust/pull/72486/
1309 [72493]: https://github.com/rust-lang/rust/pull/72493/
1310 [72331]: https://github.com/rust-lang/rust/pull/72331/
1311 [71896]: https://github.com/rust-lang/rust/pull/71896/
1312 [71660]: https://github.com/rust-lang/rust/pull/71660/
1313 [71322]: https://github.com/rust-lang/rust/pull/71322/
1314 [70740]: https://github.com/rust-lang/rust/pull/70740/
1315 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1316 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1317 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1318 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1319 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1322 Version 1.45.2 (2020-08-03)
1323 ==========================
1325 * [Fix bindings in tuple struct patterns][74954]
1326 * [Fix track_caller integration with trait objects][74784]
1328 [74954]: https://github.com/rust-lang/rust/issues/74954
1329 [74784]: https://github.com/rust-lang/rust/issues/74784
1332 Version 1.45.1 (2020-07-30)
1333 ==========================
1335 * [Fix const propagation with references.][73613]
1336 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1337 * [Avoid spurious implicit region bound.][74509]
1338 * [Install clippy on x.py install][74457]
1340 [73613]: https://github.com/rust-lang/rust/pull/73613
1341 [73078]: https://github.com/rust-lang/rust/issues/73078
1342 [74509]: https://github.com/rust-lang/rust/pull/74509
1343 [74457]: https://github.com/rust-lang/rust/pull/74457
1346 Version 1.45.0 (2020-07-16)
1347 ==========================
1351 - [Out of range float to int conversions using `as` has been defined as a saturating
1352 conversion.][71269] This was previously undefined behaviour, but you can use the
1353 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1354 may be desirable in rare performance sensitive situations.
1355 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1356 using `u64`.][70705]
1357 - [Function like procedural macros can now be used in expression, pattern, and statement
1358 positions.][68717] This means you can now use a function-like procedural macro
1359 anywhere you can use a declarative (`macro_rules!`) macro.
1363 - [You can now override individual target features through the `target-feature`
1364 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1365 equivalent to `-C target-feature=+avx2,+fma`.
1366 - [Added the `force-unwind-tables` flag.][69984] This option allows
1367 rustc to always generate unwind tables regardless of panic strategy.
1368 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1369 to include LLVM bitcode into generated `rlib`s (this is on by default).
1370 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1371 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1372 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1373 - [Upgraded to LLVM 10.][67759]
1375 \* Refer to Rust's [platform support page][platform-support-doc] for more
1376 information on Rust's tiered platform support.
1381 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1383 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1384 - [You can now use `char` with
1385 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1386 a range of codepoints.][72413] E.g.
1387 you can now write the following;
1389 for ch in 'a'..='z' {
1393 // Prints "abcdefghijklmnopqrstuvwxyz"
1395 - [`OsString` now implements `FromStr`.][71662]
1396 - [The `saturating_neg` method has been added to all signed integer primitive
1397 types, and the `saturating_abs` method has been added for all integer
1398 primitive types.][71886]
1399 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1400 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1402 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1403 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1404 integer types.][69813]
1405 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1406 integer types.][72324]
1407 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1412 - [`BTreeMap::remove_entry`]
1414 - [`rc::Weak::as_ptr`]
1415 - [`rc::Weak::from_raw`]
1416 - [`rc::Weak::into_raw`]
1417 - [`str::strip_prefix`]
1418 - [`str::strip_suffix`]
1419 - [`sync::Weak::as_ptr`]
1420 - [`sync::Weak::from_raw`]
1421 - [`sync::Weak::into_raw`]
1422 - [`char::UNICODE_VERSION`]
1423 - [`Span::resolved_at`]
1424 - [`Span::located_at`]
1425 - [`Span::mixed_site`]
1426 - [`unix::process::CommandExt::arg0`]
1431 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1436 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1437 `~~outdated information~~` becomes "~~outdated information~~".
1438 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1442 - [Trying to self initialize a static value (that is creating a value using
1443 itself) is unsound and now causes a compile error.][71140]
1444 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1445 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1446 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1447 previously undocumented and not intended for public use. Rustdoc still provides
1448 a non-zero exit code on errors.
1449 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1450 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1451 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1452 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1453 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1457 - [Make clippy a git subtree instead of a git submodule][70655]
1458 - [Unify the undo log of all snapshot types][69464]
1460 [71848]: https://github.com/rust-lang/rust/issues/71848/
1461 [73420]: https://github.com/rust-lang/rust/issues/73420/
1462 [72324]: https://github.com/rust-lang/rust/pull/72324/
1463 [71843]: https://github.com/rust-lang/rust/pull/71843/
1464 [71886]: https://github.com/rust-lang/rust/pull/71886/
1465 [72234]: https://github.com/rust-lang/rust/pull/72234/
1466 [72239]: https://github.com/rust-lang/rust/pull/72239/
1467 [72397]: https://github.com/rust-lang/rust/pull/72397/
1468 [72413]: https://github.com/rust-lang/rust/pull/72413/
1469 [72014]: https://github.com/rust-lang/rust/pull/72014/
1470 [72062]: https://github.com/rust-lang/rust/pull/72062/
1471 [72094]: https://github.com/rust-lang/rust/pull/72094/
1472 [72133]: https://github.com/rust-lang/rust/pull/72133/
1473 [67759]: https://github.com/rust-lang/rust/pull/67759/
1474 [71900]: https://github.com/rust-lang/rust/pull/71900/
1475 [71928]: https://github.com/rust-lang/rust/pull/71928/
1476 [71662]: https://github.com/rust-lang/rust/pull/71662/
1477 [71716]: https://github.com/rust-lang/rust/pull/71716/
1478 [71447]: https://github.com/rust-lang/rust/pull/71447/
1479 [71269]: https://github.com/rust-lang/rust/pull/71269/
1480 [71095]: https://github.com/rust-lang/rust/pull/71095/
1481 [71140]: https://github.com/rust-lang/rust/pull/71140/
1482 [70655]: https://github.com/rust-lang/rust/pull/70655/
1483 [70705]: https://github.com/rust-lang/rust/pull/70705/
1484 [69984]: https://github.com/rust-lang/rust/pull/69984/
1485 [69813]: https://github.com/rust-lang/rust/pull/69813/
1486 [69464]: https://github.com/rust-lang/rust/pull/69464/
1487 [68717]: https://github.com/rust-lang/rust/pull/68717/
1488 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1489 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1490 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1491 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1492 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1493 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1494 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1495 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1496 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1497 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1498 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1499 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1500 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1501 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1502 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1503 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1504 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1507 Version 1.44.1 (2020-06-18)
1508 ===========================
1510 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1511 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1512 * [Fix crashes when finding backtrace on macOS.][71397]
1513 * [Clippy applies lint levels into different files.][clippy/5356]
1515 [71397]: https://github.com/rust-lang/rust/issues/71397
1516 [73078]: https://github.com/rust-lang/rust/issues/73078
1517 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1518 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1521 Version 1.44.0 (2020-06-04)
1522 ==========================
1526 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1527 - [Added the `unused_braces` lint.][70081]
1529 **Syntax-only changes**
1531 - [Expansion-driven outline module parsing][69838]
1536 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1541 These are still rejected semantically, so you will likely receive an error but
1542 these changes can be seen and parsed by macros and conditional compilation.
1546 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1547 Additionally when in incremental mode rustc defaults to 256 codegen units.
1548 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1549 a panic is thrown.][67502]
1550 - [Added tier 3\* support for the `aarch64-unknown-none` and
1551 `aarch64-unknown-none-softfloat` targets.][68334]
1552 - [Added tier 3 support for `arm64-apple-tvos` and
1553 `x86_64-apple-tvos` targets.][68191]
1558 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1559 `vec![]` to be able to be used in `const` contexts.
1560 - [`convert::Infallible` now implements `Hash`.][70281]
1561 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1562 a `&mut OsStr`.][70048]
1563 - [Unicode 13 is now supported.][69929]
1564 - [`String` now implements `From<&mut str>`.][69661]
1565 - [`IoSlice` now implements `Copy`.][69403]
1566 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1567 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1568 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1569 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1570 integer types.][69373]
1574 - [`PathBuf::with_capacity`]
1575 - [`PathBuf::capacity`]
1576 - [`PathBuf::clear`]
1577 - [`PathBuf::reserve`]
1578 - [`PathBuf::reserve_exact`]
1579 - [`PathBuf::shrink_to_fit`]
1580 - [`f32::to_int_unchecked`]
1581 - [`f64::to_int_unchecked`]
1582 - [`Layout::align_to`]
1583 - [`Layout::pad_to_align`]
1585 - [`Layout::extend`]
1589 - [Added the `cargo tree` command which will print a tree graph of
1590 your dependencies.][cargo/8062] E.g.
1592 mdbook v0.3.2 (/Users/src/rust/mdbook)
1594 │ ├── html5ever v0.24.0
1596 │ │ │ └── cfg-if v0.1.9
1598 │ │ └── markup5ever v0.9.0
1599 │ │ ├── log v0.4.8 (*)
1601 │ │ │ └── phf_shared v0.7.24
1602 │ │ │ ├── siphasher v0.2.3
1603 │ │ │ └── unicase v1.4.2
1604 │ │ │ [build-dependencies]
1605 │ │ │ └── version_check v0.1.5
1608 You can also display dependencies on multiple versions of the same crate with
1609 `cargo tree -d` (short for `cargo tree --duplicates`).
1613 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1614 the version in the sidebar.][69494]
1618 - [Rustc now correctly generates static libraries on Windows GNU targets with
1619 the `.a` extension, rather than the previous `.lib`.][70937]
1620 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1621 - [The `file_name` property in JSON output of macro errors now points the actual
1622 source file rather than the previous format of `<NAME macros>`.][70969]
1623 **Note:** this may not point to a file that actually exists on the user's system.
1624 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1625 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1626 not allow zero initialization such as `NonZeroU8`.][66059] This was
1627 previously a warning.
1628 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1629 operator has been defined as a saturating operation.][71269] This was previously
1630 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1631 continue using the current behaviour, which may be desirable in rare performance
1632 sensitive situations.
1636 These changes provide no direct user facing benefits, but represent significant
1637 improvements to the internals and overall performance of rustc and
1640 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1641 - [Replace big JS dict with JSON parsing.][71250]
1643 [69373]: https://github.com/rust-lang/rust/pull/69373/
1644 [66059]: https://github.com/rust-lang/rust/pull/66059/
1645 [68191]: https://github.com/rust-lang/rust/pull/68191/
1646 [68899]: https://github.com/rust-lang/rust/pull/68899/
1647 [71147]: https://github.com/rust-lang/rust/pull/71147/
1648 [71250]: https://github.com/rust-lang/rust/pull/71250/
1649 [70937]: https://github.com/rust-lang/rust/pull/70937/
1650 [70969]: https://github.com/rust-lang/rust/pull/70969/
1651 [70632]: https://github.com/rust-lang/rust/pull/70632/
1652 [70281]: https://github.com/rust-lang/rust/pull/70281/
1653 [70345]: https://github.com/rust-lang/rust/pull/70345/
1654 [70048]: https://github.com/rust-lang/rust/pull/70048/
1655 [70081]: https://github.com/rust-lang/rust/pull/70081/
1656 [70156]: https://github.com/rust-lang/rust/pull/70156/
1657 [71269]: https://github.com/rust-lang/rust/pull/71269/
1658 [69838]: https://github.com/rust-lang/rust/pull/69838/
1659 [69929]: https://github.com/rust-lang/rust/pull/69929/
1660 [69661]: https://github.com/rust-lang/rust/pull/69661/
1661 [69778]: https://github.com/rust-lang/rust/pull/69778/
1662 [69494]: https://github.com/rust-lang/rust/pull/69494/
1663 [69403]: https://github.com/rust-lang/rust/pull/69403/
1664 [69033]: https://github.com/rust-lang/rust/pull/69033/
1665 [68692]: https://github.com/rust-lang/rust/pull/68692/
1666 [68334]: https://github.com/rust-lang/rust/pull/68334/
1667 [67502]: https://github.com/rust-lang/rust/pull/67502/
1668 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1669 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1670 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1671 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1672 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1673 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1674 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1675 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1676 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1677 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1678 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1679 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1680 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1683 Version 1.43.1 (2020-05-07)
1684 ===========================
1686 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1687 * [Fixed the stabilization of AVX-512 features.][71473]
1688 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1690 [71430]: https://github.com/rust-lang/rust/pull/71430
1691 [71473]: https://github.com/rust-lang/rust/issues/71473
1692 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1695 Version 1.43.0 (2020-04-23)
1696 ==========================
1700 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1701 the type inferred correctly.][68129]
1702 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1704 **Syntax only changes**
1705 - [Allow `type Foo: Ord` syntactically.][69361]
1706 - [Fuse associated and extern items up to defaultness.][69194]
1707 - [Syntactically allow `self` in all `fn` contexts.][68764]
1708 - [Merge `fn` syntax + cleanup item parsing.][68728]
1709 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1710 For example, you may now write:
1712 macro_rules! mac_trait {
1722 These are still rejected *semantically*, so you will likely receive an error but
1723 these changes can be seen and parsed by macros and
1724 conditional compilation.
1729 - [You can now pass multiple lint flags to rustc to override the previous
1730 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1731 everything in the `unused` lint group except `unused-variables` which
1732 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1733 everything in the `unused` lint group **including** `unused-variables` since
1734 the allow flag is specified before the deny flag (and therefore overridden).
1735 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1736 if they are available on `windows-gnu`.][67429]
1737 - [rustc now buffers errors/warnings printed in JSON.][69227]
1741 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1742 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1743 respectively.][69538] **Note** These conversions are only available when `N`
1745 - [You can now use associated constants on floats and integers directly, rather
1746 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1747 `f32::NAN` with no imports.
1748 - [`u8::is_ascii` is now `const`.][68984]
1749 - [`String` now implements `AsMut<str>`.][68742]
1750 - [Added the `primitive` module to `std` and `core`.][67637] This module
1751 reexports Rust's primitive types. This is mainly useful in macros
1752 where you want avoid these types being shadowed.
1753 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1754 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1758 - [`Once::is_completed`]
1763 - [`iter::once_with`]
1767 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1768 your environment.][cargo/7823]
1769 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1770 executable path when running integration tests or benchmarks.][cargo/7697]
1771 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1772 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1776 - [Certain checks in the `const_err` lint were deemed unrelated to const
1777 evaluation][69185], and have been moved to the `unconditional_panic` and
1778 `arithmetic_overflow` lints.
1783 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1784 has been a warning since 1.36.0.
1785 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1786 led to some instances being accepted, and now correctly emits a hard error.
1788 [69340]: https://github.com/rust-lang/rust/pull/69340
1792 These changes provide no direct user facing benefits, but represent significant
1793 improvements to the internals and overall performance of `rustc` and
1796 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1797 - [Improved how rustc generates drop code.][67332]
1798 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1799 - [traits: preallocate 2 Vecs of known initial size][69022]
1800 - [Avoid exponential behaviour when relating types][68772]
1801 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1802 - [Improve performance of coherence checks][68966]
1803 - [Deduplicate types in the generator witness][68672]
1804 - [Invert control in struct_lint_level.][68725]
1806 [67332]: https://github.com/rust-lang/rust/pull/67332/
1807 [67429]: https://github.com/rust-lang/rust/pull/67429/
1808 [67637]: https://github.com/rust-lang/rust/pull/67637/
1809 [67642]: https://github.com/rust-lang/rust/pull/67642/
1810 [67878]: https://github.com/rust-lang/rust/pull/67878/
1811 [67885]: https://github.com/rust-lang/rust/pull/67885/
1812 [68129]: https://github.com/rust-lang/rust/pull/68129/
1813 [68672]: https://github.com/rust-lang/rust/pull/68672/
1814 [68725]: https://github.com/rust-lang/rust/pull/68725/
1815 [68728]: https://github.com/rust-lang/rust/pull/68728/
1816 [68738]: https://github.com/rust-lang/rust/pull/68738/
1817 [68742]: https://github.com/rust-lang/rust/pull/68742/
1818 [68764]: https://github.com/rust-lang/rust/pull/68764/
1819 [68772]: https://github.com/rust-lang/rust/pull/68772/
1820 [68943]: https://github.com/rust-lang/rust/pull/68943/
1821 [68952]: https://github.com/rust-lang/rust/pull/68952/
1822 [68966]: https://github.com/rust-lang/rust/pull/68966/
1823 [68984]: https://github.com/rust-lang/rust/pull/68984/
1824 [69022]: https://github.com/rust-lang/rust/pull/69022/
1825 [69185]: https://github.com/rust-lang/rust/pull/69185/
1826 [69194]: https://github.com/rust-lang/rust/pull/69194/
1827 [69201]: https://github.com/rust-lang/rust/pull/69201/
1828 [69227]: https://github.com/rust-lang/rust/pull/69227/
1829 [69548]: https://github.com/rust-lang/rust/pull/69548/
1830 [69256]: https://github.com/rust-lang/rust/pull/69256/
1831 [69361]: https://github.com/rust-lang/rust/pull/69361/
1832 [69366]: https://github.com/rust-lang/rust/pull/69366/
1833 [69538]: https://github.com/rust-lang/rust/pull/69538/
1834 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1835 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1836 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1837 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1838 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1839 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1840 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1841 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1844 Version 1.42.0 (2020-03-12)
1845 ==========================
1849 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1851 fn foo(words: &[&str]) {
1853 ["Hello", "World", "!", ..] => println!("Hello World!"),
1854 ["Foo", "Bar", ..] => println!("Baz"),
1855 rest => println!("{:?}", rest),
1859 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1860 that you can create an enum that has the exact layout and ABI of the type
1862 - [You can now use outer attribute procedural macros on inline modules.][64273]
1863 - [There are some *syntax-only* changes:][67131]
1864 - `default` is syntactically allowed before items in `trait` definitions.
1865 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1866 leave out their bodies in favor of `;`.
1867 - Bounds on associated types in `impl`s are now syntactically allowed
1868 (e.g. `type Foo: Ord;`).
1869 - `...` (the C-variadic type) may occur syntactically directly as the type of
1870 any function parameter.
1872 These are still rejected *semantically*, so you will likely receive an error
1873 but these changes can be seen and parsed by procedural macros and
1874 conditional compilation.
1878 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1879 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1880 - [`Option::{expect,unwrap}` and
1881 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1882 pointing to the location where they were called, rather than
1883 `core`'s internals. ][67887]
1885 \* Refer to Rust's [platform support page][platform-support-doc] for more
1886 information on Rust's tiered platform support.
1890 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1891 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1892 to implement `Sized`.][67935]
1893 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1894 - [`Layout::new` is now `const`.][66254]
1895 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1900 - [`CondVar::wait_while`]
1901 - [`CondVar::wait_timeout_while`]
1903 - [`DebugMap::value`]
1904 - [`ManuallyDrop::take`]
1906 - [`ptr::slice_from_raw_parts_mut`]
1907 - [`ptr::slice_from_raw_parts`]
1911 - [You no longer need to include `extern crate proc_macro;` to be able to
1912 `use proc_macro;` in the `2018` edition.][cargo/7700]
1916 - [`Error::description` has been deprecated, and its use will now produce a
1917 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1919 [68253]: https://github.com/rust-lang/rust/pull/68253/
1920 [68348]: https://github.com/rust-lang/rust/pull/68348/
1921 [67935]: https://github.com/rust-lang/rust/pull/67935/
1922 [68339]: https://github.com/rust-lang/rust/pull/68339/
1923 [68122]: https://github.com/rust-lang/rust/pull/68122/
1924 [64273]: https://github.com/rust-lang/rust/pull/64273/
1925 [67712]: https://github.com/rust-lang/rust/pull/67712/
1926 [67887]: https://github.com/rust-lang/rust/pull/67887/
1927 [67131]: https://github.com/rust-lang/rust/pull/67131/
1928 [67233]: https://github.com/rust-lang/rust/pull/67233/
1929 [66899]: https://github.com/rust-lang/rust/pull/66899/
1930 [66919]: https://github.com/rust-lang/rust/pull/66919/
1931 [66254]: https://github.com/rust-lang/rust/pull/66254/
1932 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1933 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1934 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1935 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1936 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1937 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1938 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1939 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1940 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1943 Version 1.41.1 (2020-02-27)
1944 ===========================
1946 * [Always check types of static items][69145]
1947 * [Always check lifetime bounds of `Copy` impls][69145]
1948 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1950 [69225]: https://github.com/rust-lang/rust/issues/69225
1951 [69145]: https://github.com/rust-lang/rust/pull/69145
1954 Version 1.41.0 (2020-01-30)
1955 ===========================
1960 - [You can now pass type parameters to foreign items when implementing
1961 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1962 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1963 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1964 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1965 - [You can now use any valid identifier in a `format_args` macro.][66847]
1966 Previously identifiers starting with an underscore were not allowed.
1967 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1968 enum variants.][66183] These are still rejected semantically, but
1969 can be seen and parsed by procedural macros and conditional compilation.
1974 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1975 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1976 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1977 - [You can now pass an arguments file passing the `@path` syntax
1978 to rustc.][66172] Note that the format differs somewhat from what is
1979 found in other tooling; please see [the documentation][argfile-docs] for
1981 - [You can now provide `--extern` flag without a path, indicating that it is
1982 available from the search path or specified with an `-L` flag.][64882]
1984 \* Refer to Rust's [platform support page][platform-support-doc] for more
1985 information on Rust's tiered platform support.
1987 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1992 - [The `core::panic` module is now stable.][66771] It was already stable
1994 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1995 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1996 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2001 - [`Result::map_or`]
2002 - [`Result::map_or_else`]
2003 - [`std::rc::Weak::weak_count`]
2004 - [`std::rc::Weak::strong_count`]
2005 - [`std::sync::Weak::weak_count`]
2006 - [`std::sync::Weak::strong_count`]
2011 - [Cargo will now document all the private items for binary crates
2012 by default.][cargo/7593]
2013 - [`cargo-install` will now reinstall the package if it detects that it is out
2014 of date.][cargo/7560]
2015 - [Cargo.lock now uses a more git friendly format that should help to reduce
2016 merge conflicts.][cargo/7579]
2017 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2018 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2019 optimisation level to `2` for debug builds. You can also use
2020 `[profile.<profile>.build-override]` to override build scripts and
2026 - [You can now specify `edition` in documentation code blocks to compile the block
2027 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2028 should be compiled the 2018 edition of Rust.
2029 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2030 current theme with `--check-theme`.][54733]
2031 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2036 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2037 Apple targets.][apple-32bit-drop] This means that the source code is still
2038 available to build, but the targets are no longer being tested and release
2039 binaries for those platforms will no longer be distributed by the Rust project.
2040 Please refer to the linked blog post for more information.
2042 [54733]: https://github.com/rust-lang/rust/pull/54733/
2043 [61351]: https://github.com/rust-lang/rust/pull/61351/
2044 [67255]: https://github.com/rust-lang/rust/pull/67255/
2045 [66661]: https://github.com/rust-lang/rust/pull/66661/
2046 [66771]: https://github.com/rust-lang/rust/pull/66771/
2047 [66847]: https://github.com/rust-lang/rust/pull/66847/
2048 [66238]: https://github.com/rust-lang/rust/pull/66238/
2049 [66277]: https://github.com/rust-lang/rust/pull/66277/
2050 [66325]: https://github.com/rust-lang/rust/pull/66325/
2051 [66172]: https://github.com/rust-lang/rust/pull/66172/
2052 [66183]: https://github.com/rust-lang/rust/pull/66183/
2053 [65879]: https://github.com/rust-lang/rust/pull/65879/
2054 [65013]: https://github.com/rust-lang/rust/pull/65013/
2055 [64882]: https://github.com/rust-lang/rust/pull/64882/
2056 [64325]: https://github.com/rust-lang/rust/pull/64325/
2057 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2058 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2059 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2060 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2061 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2062 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2063 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2064 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2065 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2066 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2067 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2069 Version 1.40.0 (2019-12-19)
2070 ===========================
2074 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2075 `const` contexts.][65188] e.g.
2078 pub struct Point(i32, i32);
2080 const ORIGIN: Point = {
2081 let constructor = Point;
2087 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2088 indicate that there may be variants or fields added in the future.][64639]
2089 For example this requires adding a wild-card branch (`_ => {}`) to any match
2090 statements on a non-exhaustive `enum`. [(RFC 2008)]
2091 - [You can now use function-like procedural macros in `extern` blocks and in
2092 type positions.][63931] e.g. `type Generated = macro!();`
2093 - [Function-like and attribute procedural macros can now emit
2094 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2095 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2096 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2097 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2101 - [Added tier 3 support\* for the
2102 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2103 - [Added tier 3 support for the
2104 `aarch64-unknown-none-softfloat` target.][64589]
2105 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2106 `mips64el-unknown-linux-muslabi64` targets.][65843]
2108 \* Refer to Rust's [platform support page][platform-support-doc] for more
2109 information on Rust's tiered platform support.
2113 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2117 - [`BTreeMap::get_key_value`]
2118 - [`HashMap::get_key_value`]
2119 - [`Option::as_deref_mut`]
2120 - [`Option::as_deref`]
2121 - [`Option::flatten`]
2122 - [`UdpSocket::peer_addr`]
2123 - [`f32::to_be_bytes`]
2124 - [`f32::to_le_bytes`]
2125 - [`f32::to_ne_bytes`]
2126 - [`f64::to_be_bytes`]
2127 - [`f64::to_le_bytes`]
2128 - [`f64::to_ne_bytes`]
2129 - [`f32::from_be_bytes`]
2130 - [`f32::from_le_bytes`]
2131 - [`f32::from_ne_bytes`]
2132 - [`f64::from_be_bytes`]
2133 - [`f64::from_le_bytes`]
2134 - [`f64::from_ne_bytes`]
2141 - [Cargo will now always display warnings, rather than only on
2142 fresh builds.][cargo/7450]
2143 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2144 now produce an error.][cargo/7507] Previously these flags were ignored.
2145 - [You can now publish `dev-dependencies` without including
2146 a `version`.][cargo/7333]
2150 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2151 when running documentation tests with `rustdoc`.][63803]
2155 - [As previously announced, any previous NLL warnings in the 2015 edition are
2156 now hard errors.][64221]
2157 - [The `include!` macro will now warn if it failed to include the
2158 entire file.][64284] The `include!` macro unintentionally only includes the
2159 first _expression_ in a file, and this can be unintuitive. This will become
2160 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2161 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2162 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2163 or `extern` blocks now correctly emits a hard error.
2165 [65294]: https://github.com/rust-lang/rust/pull/65294/
2166 [66103]: https://github.com/rust-lang/rust/pull/66103/
2167 [65843]: https://github.com/rust-lang/rust/pull/65843/
2168 [65188]: https://github.com/rust-lang/rust/pull/65188/
2169 [65092]: https://github.com/rust-lang/rust/pull/65092/
2170 [64589]: https://github.com/rust-lang/rust/pull/64589/
2171 [64639]: https://github.com/rust-lang/rust/pull/64639/
2172 [64221]: https://github.com/rust-lang/rust/pull/64221/
2173 [64284]: https://github.com/rust-lang/rust/pull/64284/
2174 [63931]: https://github.com/rust-lang/rust/pull/63931/
2175 [64035]: https://github.com/rust-lang/rust/pull/64035/
2176 [63674]: https://github.com/rust-lang/rust/pull/63674/
2177 [63803]: https://github.com/rust-lang/rust/pull/63803/
2178 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2179 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2180 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2181 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2182 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2183 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2184 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2185 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2186 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2187 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2188 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2189 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2190 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2191 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2192 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2193 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2194 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2195 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2196 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2197 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2198 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2199 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2200 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2201 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2202 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2203 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2206 Version 1.39.0 (2019-11-07)
2207 ===========================
2211 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2212 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2213 - [You can now use certain attributes on function, closure, and function pointer
2214 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2215 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2216 attributes applied to items. e.g.
2219 #[cfg(windows)] slice: &[u16],
2220 #[cfg(not(windows))] slice: &[u8],
2225 - [You can now take shared references to bind-by-move patterns in the `if` guards
2226 of `match` arms.][63118] e.g.
2229 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2233 // ---- `nums` is bound by move.
2234 if nums.iter().sum::<u8>() == 10
2235 // ^------ `.iter()` implicitly takes a reference to `nums`.
2238 // ----------- Legal as `nums` was bound by move and so we have ownership.
2240 _ => unreachable!(),
2249 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2250 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2251 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2252 **Note** Cargo currently doesn't use this feature. Refer to
2253 [cargo#7315][cargo/7315] to track this feature's progress.
2254 - [You can now pass `--show-output` argument to test binaries to print the
2255 output of successful tests.][62600]
2258 \* Refer to Rust's [platform support page][platform-support-doc] for more
2259 information on Rust's tiered platform support.
2263 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2264 - [`LinkedList::new` is now a `const` function.][63684]
2265 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2266 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2267 now `const`.][63786]
2271 - [`Pin::into_inner`]
2272 - [`Instant::checked_duration_since`]
2273 - [`Instant::saturating_duration_since`]
2277 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2278 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2279 `--all` is now deprecated.
2283 - [You can now pass `-Clinker` to rustdoc to control the linker used
2284 for compiling doctests.][63834]
2288 - [Code that was previously accepted by the old borrow checker, but rejected by
2289 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2290 previously a warning, and will also become a hard error in the Rust 2015
2291 edition in the 1.40.0 release.
2292 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2293 run tests.][63827] This should improve performance when running a large
2295 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2296 recommended to use the `?` operator instead.
2297 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2300 [62600]: https://github.com/rust-lang/rust/pull/62600/
2301 [62672]: https://github.com/rust-lang/rust/pull/62672/
2302 [63118]: https://github.com/rust-lang/rust/pull/63118/
2303 [63209]: https://github.com/rust-lang/rust/pull/63209/
2304 [63402]: https://github.com/rust-lang/rust/pull/63402/
2305 [63565]: https://github.com/rust-lang/rust/pull/63565/
2306 [63595]: https://github.com/rust-lang/rust/pull/63595/
2307 [63684]: https://github.com/rust-lang/rust/pull/63684/
2308 [63698]: https://github.com/rust-lang/rust/pull/63698/
2309 [63770]: https://github.com/rust-lang/rust/pull/63770/
2310 [63786]: https://github.com/rust-lang/rust/pull/63786/
2311 [63827]: https://github.com/rust-lang/rust/pull/63827/
2312 [63834]: https://github.com/rust-lang/rust/pull/63834/
2313 [63927]: https://github.com/rust-lang/rust/pull/63927/
2314 [63933]: https://github.com/rust-lang/rust/pull/63933/
2315 [63934]: https://github.com/rust-lang/rust/pull/63934/
2316 [63938]: https://github.com/rust-lang/rust/pull/63938/
2317 [63940]: https://github.com/rust-lang/rust/pull/63940/
2318 [63941]: https://github.com/rust-lang/rust/pull/63941/
2319 [63945]: https://github.com/rust-lang/rust/pull/63945/
2320 [64010]: https://github.com/rust-lang/rust/pull/64010/
2321 [64028]: https://github.com/rust-lang/rust/pull/64028/
2322 [64334]: https://github.com/rust-lang/rust/pull/64334/
2323 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2324 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2325 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2326 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2327 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2328 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2330 Version 1.38.0 (2019-09-26)
2331 ==========================
2335 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2336 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2340 - [Added pipelined compilation support to `rustc`.][62766] This will
2341 improve compilation times in some cases. For further information please refer
2342 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2343 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2344 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2345 `x86_64-uwp-windows-msvc` targets.][60260]
2346 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2347 `armv7-unknown-linux-musleabi` targets.][63107]
2348 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2349 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2350 - [Upgraded to LLVM 9.][62592]
2352 \* Refer to Rust's [platform support page][platform-support-doc] for more
2353 information on Rust's tiered platform support.
2357 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2358 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2359 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2360 is available at `std::clone::Clone`). This also makes all built-in macros
2361 available in `std`/`core` root. e.g. `std::include_bytes!`.
2362 - [`str::Chars` now implements `Debug`.][63000]
2363 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2364 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2365 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2366 - [Added euclidean remainder and division operations (`div_euclid`,
2367 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2368 `overflowing`, and `wrapping` versions are available for all
2370 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2371 `PartialEq`.][61491]
2372 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2376 - [`<*const T>::cast`]
2377 - [`<*mut T>::cast`]
2378 - [`Duration::as_secs_f32`]
2379 - [`Duration::as_secs_f64`]
2380 - [`Duration::div_f32`]
2381 - [`Duration::div_f64`]
2382 - [`Duration::from_secs_f32`]
2383 - [`Duration::from_secs_f64`]
2384 - [`Duration::mul_f32`]
2385 - [`Duration::mul_f64`]
2386 - [`any::type_name`]
2390 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2391 - [You can now pass the `--features` option multiple times to enable
2392 multiple features.][cargo/7084]
2397 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2401 - [`rustc` will now warn about some incorrect uses of
2402 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2406 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2408 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2409 issues][62896] with certain crates such as libc.
2411 [60260]: https://github.com/rust-lang/rust/pull/60260/
2412 [61457]: https://github.com/rust-lang/rust/pull/61457/
2413 [61491]: https://github.com/rust-lang/rust/pull/61491/
2414 [61884]: https://github.com/rust-lang/rust/pull/61884/
2415 [61953]: https://github.com/rust-lang/rust/pull/61953/
2416 [62042]: https://github.com/rust-lang/rust/pull/62042/
2417 [62528]: https://github.com/rust-lang/rust/pull/62528/
2418 [62583]: https://github.com/rust-lang/rust/pull/62583/
2419 [62735]: https://github.com/rust-lang/rust/pull/62735/
2420 [62766]: https://github.com/rust-lang/rust/pull/62766/
2421 [62784]: https://github.com/rust-lang/rust/pull/62784/
2422 [62592]: https://github.com/rust-lang/rust/pull/62592/
2423 [62785]: https://github.com/rust-lang/rust/issues/62785/
2424 [62814]: https://github.com/rust-lang/rust/pull/62814/
2425 [62896]: https://github.com/rust-lang/rust/issues/62896/
2426 [63000]: https://github.com/rust-lang/rust/pull/63000/
2427 [63056]: https://github.com/rust-lang/rust/pull/63056/
2428 [63107]: https://github.com/rust-lang/rust/pull/63107/
2429 [63346]: https://github.com/rust-lang/rust/pull/63346/
2430 [63421]: https://github.com/rust-lang/rust/pull/63421/
2431 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2432 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2433 [63048]: https://github.com/rust-lang/rust/pull/63048
2434 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2435 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2436 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2437 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2438 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2439 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2440 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2441 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2442 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2443 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2444 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2445 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2446 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2448 Version 1.37.0 (2019-08-15)
2449 ==========================
2453 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2454 [`Box`][62228], or an [array][62235] and unused.
2455 - [You can now use the `cfg` and `cfg_attr` attributes on
2456 generic parameters.][61547]
2457 - [You can now use enum variants through type alias.][61682] e.g. You can
2458 write the following:
2460 type MyOption = Option<u8>;
2462 fn increment_or_zero(x: MyOption) -> u8 {
2464 MyOption::Some(y) => y + 1,
2465 MyOption::None => 0,
2469 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2470 `const _: u32 = 5;`.
2471 - [You can now use `#[repr(align(X)]` on enums.][61229]
2472 - [The `?` Kleene macro operator is now available in the
2473 2015 edition.][60932]
2477 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2478 and `-C profile-use` flags.][61268] For more information on how to use profile
2479 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2480 - [The `rust-lldb` wrapper script should now work again.][61827]
2484 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2488 - [`BufReader::buffer`]
2489 - [`BufWriter::buffer`]
2490 - [`Cell::from_mut`]
2491 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2492 - [`DoubleEndedIterator::nth_back`]
2494 - [`Wrapping::reverse_bits`]
2495 - [`i128::reverse_bits`]
2496 - [`i16::reverse_bits`]
2497 - [`i32::reverse_bits`]
2498 - [`i64::reverse_bits`]
2499 - [`i8::reverse_bits`]
2500 - [`isize::reverse_bits`]
2501 - [`slice::copy_within`]
2502 - [`u128::reverse_bits`]
2503 - [`u16::reverse_bits`]
2504 - [`u32::reverse_bits`]
2505 - [`u64::reverse_bits`]
2506 - [`u8::reverse_bits`]
2507 - [`usize::reverse_bits`]
2511 - [`Cargo.lock` files are now included by default when publishing executable crates
2512 with executables.][cargo/7026]
2513 - [You can now specify `default-run="foo"` in `[package]` to specify the
2514 default executable to use for `cargo run`.][cargo/7056]
2521 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2522 Please transition your code to using the `..=` syntax for inclusive
2524 - [Using a trait object without the `dyn` will now warn by default.][61203]
2525 Please transition your code to use `dyn Trait` for trait objects instead.
2527 [62228]: https://github.com/rust-lang/rust/pull/62228/
2528 [62235]: https://github.com/rust-lang/rust/pull/62235/
2529 [61802]: https://github.com/rust-lang/rust/pull/61802/
2530 [61827]: https://github.com/rust-lang/rust/pull/61827/
2531 [61547]: https://github.com/rust-lang/rust/pull/61547/
2532 [61682]: https://github.com/rust-lang/rust/pull/61682/
2533 [61268]: https://github.com/rust-lang/rust/pull/61268/
2534 [61342]: https://github.com/rust-lang/rust/pull/61342/
2535 [61347]: https://github.com/rust-lang/rust/pull/61347/
2536 [61100]: https://github.com/rust-lang/rust/pull/61100/
2537 [61203]: https://github.com/rust-lang/rust/pull/61203/
2538 [61229]: https://github.com/rust-lang/rust/pull/61229/
2539 [60932]: https://github.com/rust-lang/rust/pull/60932/
2540 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2541 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2542 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2543 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2544 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2545 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2546 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2547 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2548 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2549 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2550 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2551 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2552 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2553 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2554 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2555 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2556 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2557 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2558 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2559 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2560 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2561 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2562 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2563 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2566 Version 1.36.0 (2019-07-04)
2567 ==========================
2571 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2572 - [The order of traits in trait objects no longer affects the semantics of that
2573 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2574 `dyn fmt::Debug + Send`, where this was previously not the case.
2578 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2579 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2580 - [`mem::needs_drop` is now available as a const fn.][60364]
2581 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2582 - [`String` now implements `BorrowMut<str>`.][60404]
2583 - [`io::Cursor` now implements `Default`.][60234]
2584 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2585 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2586 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2587 environment has access to heap memory allocation.
2588 - [`String` now implements `From<&String>`.][59825]
2589 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2590 return a tuple of each argument when there is multiple arguments.
2591 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2596 - [`VecDeque::rotate_left`]
2597 - [`VecDeque::rotate_right`]
2598 - [`Iterator::copied`]
2600 - [`io::IoSliceMut`]
2601 - [`Read::read_vectored`]
2602 - [`Write::write_vectored`]
2603 - [`str::as_mut_ptr`]
2604 - [`mem::MaybeUninit`]
2605 - [`pointer::align_offset`]
2606 - [`future::Future`]
2608 - [`task::RawWaker`]
2609 - [`task::RawWakerVTable`]
2615 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2616 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2618 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2622 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2629 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2630 longer recommended, and will be deprecated in 1.39.0.
2632 [60318]: https://github.com/rust-lang/rust/pull/60318/
2633 [60364]: https://github.com/rust-lang/rust/pull/60364/
2634 [60370]: https://github.com/rust-lang/rust/pull/60370/
2635 [60404]: https://github.com/rust-lang/rust/pull/60404/
2636 [60234]: https://github.com/rust-lang/rust/pull/60234/
2637 [60244]: https://github.com/rust-lang/rust/pull/60244/
2638 [58623]: https://github.com/rust-lang/rust/pull/58623/
2639 [59648]: https://github.com/rust-lang/rust/pull/59648/
2640 [59675]: https://github.com/rust-lang/rust/pull/59675/
2641 [59825]: https://github.com/rust-lang/rust/pull/59825/
2642 [59826]: https://github.com/rust-lang/rust/pull/59826/
2643 [59445]: https://github.com/rust-lang/rust/pull/59445/
2644 [59114]: https://github.com/rust-lang/rust/pull/59114/
2645 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2646 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2647 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2648 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2649 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2650 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2651 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2652 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2653 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2654 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2655 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2656 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2657 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2658 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2659 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2660 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2661 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2662 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2663 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2664 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2667 Version 1.35.0 (2019-05-23)
2668 ==========================
2672 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2673 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2674 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2676 unsafe fn call_unsafe(func: unsafe fn()) {
2681 unsafe { call_unsafe(|| {}); }
2688 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2689 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2690 - [Added the `wasm32-unknown-wasi` target.][59464]
2695 - [`Thread` will now show its ID in `Debug` output.][59460]
2696 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2697 - [`alloc::System` now implements `Default`.][59451]
2698 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2700 - [`char::{ToLowercase, ToUppercase}` now
2701 implement `ExactSizeIterator`.][58778]
2702 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2703 - [Removed the `Read` trait bounds
2704 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2705 - [You can now call the `dbg!` macro without any parameters to print the file
2706 and line where it is called.][57847]
2707 - [In place ASCII case conversions are now up to 4× faster.][59283]
2708 e.g. `str::make_ascii_lowercase`
2709 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2716 - [`RefCell::replace_with`]
2717 - [`RefCell::map_split`]
2719 - [`Range::contains`]
2720 - [`RangeFrom::contains`]
2721 - [`RangeTo::contains`]
2722 - [`RangeInclusive::contains`]
2723 - [`RangeToInclusive::contains`]
2724 - [`Option::copied`]
2728 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2729 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2734 - [The Rust toolchain is now available natively for musl based distros.][58575]
2736 [59460]: https://github.com/rust-lang/rust/pull/59460/
2737 [59464]: https://github.com/rust-lang/rust/pull/59464/
2738 [59500]: https://github.com/rust-lang/rust/pull/59500/
2739 [59512]: https://github.com/rust-lang/rust/pull/59512/
2740 [59580]: https://github.com/rust-lang/rust/pull/59580/
2741 [59283]: https://github.com/rust-lang/rust/pull/59283/
2742 [59451]: https://github.com/rust-lang/rust/pull/59451/
2743 [59076]: https://github.com/rust-lang/rust/pull/59076/
2744 [58778]: https://github.com/rust-lang/rust/pull/58778/
2745 [58717]: https://github.com/rust-lang/rust/pull/58717/
2746 [58369]: https://github.com/rust-lang/rust/pull/58369/
2747 [58423]: https://github.com/rust-lang/rust/pull/58423/
2748 [58080]: https://github.com/rust-lang/rust/pull/58080/
2749 [57847]: https://github.com/rust-lang/rust/pull/57847/
2750 [58575]: https://github.com/rust-lang/rust/pull/58575
2751 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2752 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2753 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2754 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2755 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2756 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2757 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2758 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2759 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2760 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2761 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2762 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2764 Version 1.34.2 (2019-05-14)
2765 ===========================
2767 * [Destabilize the `Error::type_id` function due to a security
2768 vulnerability][60785] ([CVE-2019-12083])
2770 [60785]: https://github.com/rust-lang/rust/pull/60785
2771 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2773 Version 1.34.1 (2019-04-25)
2774 ===========================
2776 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2777 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2778 * [Fix Clippy panic when checking some macros][clippy/3805]
2780 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2781 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2782 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2784 Version 1.34.0 (2019-04-11)
2785 ==========================
2789 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2790 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2792 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2793 `#[attr{}]` procedural macros.][57367]
2794 - [You can now write `extern crate self as foo;`][57407] to import your
2795 crate's root into the extern prelude.
2800 - [You can now target `riscv64imac-unknown-none-elf` and
2801 `riscv64gc-unknown-none-elf`.][58406]
2802 - [You can now enable linker plugin LTO optimisations with
2803 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2804 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2806 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2811 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2812 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2813 the `Hash` trait to create an iterator.
2814 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2815 methods.][58421] Most notably you no longer require the `Ord` trait to create
2817 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2818 for all numeric types.][58044]
2819 - [Indexing a `str` is now generic over all types that
2820 implement `SliceIndex<str>`.][57604]
2821 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2822 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2823 produce a warning if their returning type is unused.
2824 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2825 `overflowing_pow` are now available for all numeric types.][57873] These are
2826 equivalent to methods such as `wrapping_add` for the `pow` operation.
2834 * [`Error::type_id`]
2835 * [`atomic::AtomicI16`]
2836 * [`atomic::AtomicI32`]
2837 * [`atomic::AtomicI64`]
2838 * [`atomic::AtomicI8`]
2839 * [`atomic::AtomicU16`]
2840 * [`atomic::AtomicU32`]
2841 * [`atomic::AtomicU64`]
2842 * [`atomic::AtomicU8`]
2843 * [`convert::Infallible`]
2844 * [`convert::TryFrom`]
2845 * [`convert::TryInto`]
2847 * [`iter::successors`]
2848 * [`num::NonZeroI128`]
2849 * [`num::NonZeroI16`]
2850 * [`num::NonZeroI32`]
2851 * [`num::NonZeroI64`]
2852 * [`num::NonZeroI8`]
2853 * [`num::NonZeroIsize`]
2854 * [`slice::sort_by_cached_key`]
2855 * [`str::escape_debug`]
2856 * [`str::escape_default`]
2857 * [`str::escape_unicode`]
2858 * [`str::split_ascii_whitespace`]
2861 * [`Instant::checked_add`]
2862 * [`Instant::checked_sub`]
2863 * [`SystemTime::checked_add`]
2864 * [`SystemTime::checked_sub`]
2868 - [You can now use alternative registries to crates.io.][cargo/6654]
2872 - [You can now use the `?` operator in your documentation tests without manually
2873 adding `fn main() -> Result<(), _> {}`.][56470]
2877 - [`Command::before_exec` is being replaced by the unsafe method
2878 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2879 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2880 can now use `const` functions in `static` variables.
2882 [58370]: https://github.com/rust-lang/rust/pull/58370/
2883 [58406]: https://github.com/rust-lang/rust/pull/58406/
2884 [58421]: https://github.com/rust-lang/rust/pull/58421/
2885 [58166]: https://github.com/rust-lang/rust/pull/58166/
2886 [58044]: https://github.com/rust-lang/rust/pull/58044/
2887 [58057]: https://github.com/rust-lang/rust/pull/58057/
2888 [58059]: https://github.com/rust-lang/rust/pull/58059/
2889 [57809]: https://github.com/rust-lang/rust/pull/57809/
2890 [57873]: https://github.com/rust-lang/rust/pull/57873/
2891 [57604]: https://github.com/rust-lang/rust/pull/57604/
2892 [57367]: https://github.com/rust-lang/rust/pull/57367/
2893 [57407]: https://github.com/rust-lang/rust/pull/57407/
2894 [57425]: https://github.com/rust-lang/rust/pull/57425/
2895 [57106]: https://github.com/rust-lang/rust/pull/57106/
2896 [56470]: https://github.com/rust-lang/rust/pull/56470/
2897 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2898 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2899 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2900 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2901 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2902 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2903 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2904 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2905 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2906 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2907 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2908 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2909 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2910 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2911 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2912 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2913 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2914 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2915 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2916 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2917 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2918 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2919 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2920 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2921 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2922 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2923 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2924 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2925 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2926 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2927 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2930 Version 1.33.0 (2019-02-28)
2931 ==========================
2935 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2936 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2937 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2938 E.g. You can have match statement on a `u8` that covers `0..=255` and
2939 you would no longer be required to have a `_ => unreachable!()` case.
2940 - [You can now have multiple patterns in `if let` and `while let`
2941 expressions.][57532] You can do this with the same syntax as a `match`
2951 let state = Creature::Crab("Ferris");
2953 if let Creature::Crab(name) | Creature::Person(name) = state {
2954 println!("This creature's name is: {}", name);
2958 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2959 this feature will by default produce a warning as this behaviour can be
2960 unintuitive. E.g. `if let _ = 5 {}`
2961 - [You can now use `let` bindings, assignments, expression statements,
2962 and irrefutable pattern destructuring in const functions.][57175]
2963 - [You can now call unsafe const functions.][57067] E.g.
2965 const unsafe fn foo() -> i32 { 5 }
2966 const fn bar() -> i32 {
2970 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2971 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2972 - [You can now specify a specific alignment with the `#[repr(packed)]`
2973 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2974 with an alignment of 2 bytes and a size of 6 bytes.
2975 - [You can now import an item from a module as an `_`.][56303] This allows you to
2976 import a trait's impls, and not have the name in the namespace. E.g.
2978 use std::io::Read as _;
2980 // Allowed as there is only one `Read` in the module.
2983 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2987 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2988 command line argument.][56351]
2989 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2990 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2991 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2992 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2993 information on Rust's platform support.
2994 - [Added support for the `thumbv7neon-linux-androideabi` and
2995 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2996 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3000 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3001 functions for all numeric types.][57566]
3002 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3003 are now `const` functions for all numeric types.][57105]
3004 - [The methods `is_positive` and `is_negative` are now `const` functions for
3005 all signed numeric types.][57105]
3006 - [The `get` method for all `NonZero` types is now `const`.][57167]
3007 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3008 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3009 numeric types.][57234]
3010 - [`Ipv4Addr::new` is now a `const` function][57234]
3014 - [`unix::FileExt::read_exact_at`]
3015 - [`unix::FileExt::write_all_at`]
3016 - [`Option::transpose`]
3017 - [`Result::transpose`]
3018 - [`convert::identity`]
3021 - [`marker::PhantomPinned`]
3022 - [`Vec::resize_with`]
3023 - [`VecDeque::resize_with`]
3024 - [`Duration::as_millis`]
3025 - [`Duration::as_micros`]
3026 - [`Duration::as_nanos`]
3031 - [You can now publish crates that require a feature flag to compile with
3032 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3033 - [Cargo should now rebuild a crate if a file was modified during the initial
3038 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3039 are now deprecated in the standard library, and their usage will now produce a warning.
3040 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3042 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3044 - [Libtest no longer creates a new thread for each test when
3045 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3047 [55982]: https://github.com/rust-lang/rust/pull/55982/
3048 [56243]: https://github.com/rust-lang/rust/pull/56243
3049 [56303]: https://github.com/rust-lang/rust/pull/56303/
3050 [56351]: https://github.com/rust-lang/rust/pull/56351/
3051 [56362]: https://github.com/rust-lang/rust/pull/56362
3052 [56642]: https://github.com/rust-lang/rust/pull/56642/
3053 [56769]: https://github.com/rust-lang/rust/pull/56769/
3054 [56805]: https://github.com/rust-lang/rust/pull/56805
3055 [56947]: https://github.com/rust-lang/rust/pull/56947/
3056 [57049]: https://github.com/rust-lang/rust/pull/57049/
3057 [57067]: https://github.com/rust-lang/rust/pull/57067/
3058 [57105]: https://github.com/rust-lang/rust/pull/57105
3059 [57130]: https://github.com/rust-lang/rust/pull/57130/
3060 [57167]: https://github.com/rust-lang/rust/pull/57167/
3061 [57175]: https://github.com/rust-lang/rust/pull/57175/
3062 [57234]: https://github.com/rust-lang/rust/pull/57234/
3063 [57332]: https://github.com/rust-lang/rust/pull/57332/
3064 [57465]: https://github.com/rust-lang/rust/pull/57465/
3065 [57532]: https://github.com/rust-lang/rust/pull/57532/
3066 [57535]: https://github.com/rust-lang/rust/pull/57535/
3067 [57566]: https://github.com/rust-lang/rust/pull/57566/
3068 [57615]: https://github.com/rust-lang/rust/pull/57615/
3069 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3070 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3071 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3072 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3073 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3074 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3075 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3076 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3077 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3078 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3079 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3080 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3081 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3082 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3083 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3084 [platform-support]: https://forge.rust-lang.org/platform-support.html
3086 Version 1.32.0 (2019-01-17)
3087 ==========================
3092 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3093 operator allows you to specify zero or one repetitions similar to the `*` and
3095 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3096 now always resolve to the item (`enum`, `struct`, etc.) available in the
3097 module if present, before resolving to a external crate or an item the prelude.][56759]
3100 enum Color { Red, Green, Blue }
3106 - [You can now match against `PhantomData<T>` types.][55837]
3107 - [You can now match against literals in macros with the `literal`
3108 specifier.][56072] This will match against a literal of any type.
3109 E.g. `1`, `'A'`, `"Hello World"`
3110 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3112 struct Point(i32, i32);
3115 pub fn new(x: i32, y: i32) -> Self {
3119 pub fn is_origin(&self) -> bool {
3127 - [Self can also now be used in type definitions.][56366] E.g.
3131 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3134 Cons(T, Box<Self>) // likewise here
3137 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3138 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3142 - [The default allocator has changed from jemalloc to the default allocator on
3143 your system.][55238] The compiler itself on Linux & macOS will still use
3144 jemalloc, but programs compiled with it will use the system allocator.
3145 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3149 - [`PathBuf` now implements `FromStr`.][55148]
3150 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3151 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3152 easily debug expressions in your rust program. E.g.
3155 let b = dbg!(a * 2) + 1;
3156 // ^-- prints: [src/main.rs:4] a * 2 = 4
3160 The following APIs are now `const` functions and can be used in a
3164 - [`UnsafeCell::get`]
3165 - [`char::is_ascii`]
3167 - [`ManuallyDrop::new`]
3168 - [`ManuallyDrop::into_inner`]
3169 - [`RangeInclusive::start`]
3170 - [`RangeInclusive::end`]
3171 - [`NonNull::as_ptr`]
3174 - [`Duration::as_secs`]
3175 - [`Duration::subsec_millis`]
3176 - [`Duration::subsec_micros`]
3177 - [`Duration::subsec_nanos`]
3179 - [`Ipv4Addr::is_unspecified`]
3181 - [`Ipv6Addr::octets`]
3185 - [`i8::to_be_bytes`]
3186 - [`i8::to_le_bytes`]
3187 - [`i8::to_ne_bytes`]
3188 - [`i8::from_be_bytes`]
3189 - [`i8::from_le_bytes`]
3190 - [`i8::from_ne_bytes`]
3191 - [`i16::to_be_bytes`]
3192 - [`i16::to_le_bytes`]
3193 - [`i16::to_ne_bytes`]
3194 - [`i16::from_be_bytes`]
3195 - [`i16::from_le_bytes`]
3196 - [`i16::from_ne_bytes`]
3197 - [`i32::to_be_bytes`]
3198 - [`i32::to_le_bytes`]
3199 - [`i32::to_ne_bytes`]
3200 - [`i32::from_be_bytes`]
3201 - [`i32::from_le_bytes`]
3202 - [`i32::from_ne_bytes`]
3203 - [`i64::to_be_bytes`]
3204 - [`i64::to_le_bytes`]
3205 - [`i64::to_ne_bytes`]
3206 - [`i64::from_be_bytes`]
3207 - [`i64::from_le_bytes`]
3208 - [`i64::from_ne_bytes`]
3209 - [`i128::to_be_bytes`]
3210 - [`i128::to_le_bytes`]
3211 - [`i128::to_ne_bytes`]
3212 - [`i128::from_be_bytes`]
3213 - [`i128::from_le_bytes`]
3214 - [`i128::from_ne_bytes`]
3215 - [`isize::to_be_bytes`]
3216 - [`isize::to_le_bytes`]
3217 - [`isize::to_ne_bytes`]
3218 - [`isize::from_be_bytes`]
3219 - [`isize::from_le_bytes`]
3220 - [`isize::from_ne_bytes`]
3221 - [`u8::to_be_bytes`]
3222 - [`u8::to_le_bytes`]
3223 - [`u8::to_ne_bytes`]
3224 - [`u8::from_be_bytes`]
3225 - [`u8::from_le_bytes`]
3226 - [`u8::from_ne_bytes`]
3227 - [`u16::to_be_bytes`]
3228 - [`u16::to_le_bytes`]
3229 - [`u16::to_ne_bytes`]
3230 - [`u16::from_be_bytes`]
3231 - [`u16::from_le_bytes`]
3232 - [`u16::from_ne_bytes`]
3233 - [`u32::to_be_bytes`]
3234 - [`u32::to_le_bytes`]
3235 - [`u32::to_ne_bytes`]
3236 - [`u32::from_be_bytes`]
3237 - [`u32::from_le_bytes`]
3238 - [`u32::from_ne_bytes`]
3239 - [`u64::to_be_bytes`]
3240 - [`u64::to_le_bytes`]
3241 - [`u64::to_ne_bytes`]
3242 - [`u64::from_be_bytes`]
3243 - [`u64::from_le_bytes`]
3244 - [`u64::from_ne_bytes`]
3245 - [`u128::to_be_bytes`]
3246 - [`u128::to_le_bytes`]
3247 - [`u128::to_ne_bytes`]
3248 - [`u128::from_be_bytes`]
3249 - [`u128::from_le_bytes`]
3250 - [`u128::from_ne_bytes`]
3251 - [`usize::to_be_bytes`]
3252 - [`usize::to_le_bytes`]
3253 - [`usize::to_ne_bytes`]
3254 - [`usize::from_be_bytes`]
3255 - [`usize::from_le_bytes`]
3256 - [`usize::from_ne_bytes`]
3260 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3261 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3265 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3269 - [The argument types for AVX's
3270 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3271 been changed from `*const` to `*mut` as the previous implementation
3275 [55148]: https://github.com/rust-lang/rust/pull/55148/
3276 [55238]: https://github.com/rust-lang/rust/pull/55238/
3277 [55280]: https://github.com/rust-lang/rust/pull/55280/
3278 [55610]: https://github.com/rust-lang/rust/pull/55610/
3279 [55663]: https://github.com/rust-lang/rust/pull/55663/
3280 [55702]: https://github.com/rust-lang/rust/pull/55702/
3281 [55837]: https://github.com/rust-lang/rust/pull/55837/
3282 [55843]: https://github.com/rust-lang/rust/pull/55843/
3283 [56072]: https://github.com/rust-lang/rust/pull/56072/
3284 [56245]: https://github.com/rust-lang/rust/pull/56245/
3285 [56365]: https://github.com/rust-lang/rust/pull/56365/
3286 [56366]: https://github.com/rust-lang/rust/pull/56366/
3287 [56395]: https://github.com/rust-lang/rust/pull/56395/
3288 [56759]: https://github.com/rust-lang/rust/pull/56759/
3289 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3290 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3291 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3292 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3293 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3294 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3295 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3296 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3297 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3298 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3299 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3300 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3301 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3302 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3303 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3304 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3305 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3306 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3307 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3308 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3309 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3310 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3311 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3312 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3313 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3314 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3315 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3316 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3317 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3318 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3319 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3320 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3321 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3322 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3323 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3324 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3325 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3326 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3327 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3328 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3329 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3330 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3331 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3332 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3333 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3334 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3335 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3336 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3337 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3338 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3339 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3340 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3341 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3342 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3343 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3344 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3345 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3346 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3347 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3348 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3349 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3350 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3351 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3352 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3353 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3354 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3355 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3356 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3357 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3358 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3359 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3360 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3361 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3362 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3363 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3364 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3365 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3366 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3367 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3368 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3369 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3370 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3371 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3372 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3373 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3374 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3375 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3376 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3377 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3378 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3379 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3380 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3381 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3384 Version 1.31.1 (2018-12-20)
3385 ===========================
3387 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3388 - [Fix broken go-to-definition in RLS][rls/1171]
3389 - [Fix infinite loop on hover in RLS][rls/1170]
3391 [56562]: https://github.com/rust-lang/rust/pull/56562
3392 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3393 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3395 Version 1.31.0 (2018-12-06)
3396 ==========================
3400 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3401 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3402 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3403 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3405 - [You can now define and use `const` functions.][54835] These are currently
3406 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3407 [language reference][const-reference] for what exactly is available.
3408 - [You can now use tool lints, which allow you to scope lints from external
3409 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3410 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3411 a crate, not just in exported functions.][54451]
3412 - [You can now use parentheses in pattern matches.][54497]
3416 - [Updated musl to 1.1.20][54430]
3420 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3421 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3422 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3423 into `Option<&mut T>` using the `From` trait.][53218]
3424 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3429 - [`slice::align_to`]
3430 - [`slice::align_to_mut`]
3431 - [`slice::chunks_exact`]
3432 - [`slice::chunks_exact_mut`]
3433 - [`slice::rchunks`]
3434 - [`slice::rchunks_mut`]
3435 - [`slice::rchunks_exact`]
3436 - [`slice::rchunks_exact_mut`]
3437 - [`Option::replace`]
3441 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3442 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3443 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3445 [52813]: https://github.com/rust-lang/rust/pull/52813/
3446 [53218]: https://github.com/rust-lang/rust/pull/53218/
3447 [53555]: https://github.com/rust-lang/rust/issues/53555/
3448 [54057]: https://github.com/rust-lang/rust/pull/54057/
3449 [54240]: https://github.com/rust-lang/rust/pull/54240/
3450 [54430]: https://github.com/rust-lang/rust/pull/54430/
3451 [54451]: https://github.com/rust-lang/rust/pull/54451/
3452 [54497]: https://github.com/rust-lang/rust/pull/54497/
3453 [54778]: https://github.com/rust-lang/rust/pull/54778/
3454 [54835]: https://github.com/rust-lang/rust/pull/54835/
3455 [54870]: https://github.com/rust-lang/rust/pull/54870/
3456 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3457 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3458 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3459 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3460 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3461 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3462 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3463 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3464 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3465 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3466 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3467 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3468 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3469 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3471 Version 1.30.1 (2018-11-08)
3472 ===========================
3474 - [Fixed overflow ICE in rustdoc][54199]
3475 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3477 [54199]: https://github.com/rust-lang/rust/pull/54199
3478 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3480 Version 1.30.0 (2018-10-25)
3481 ==========================
3485 - [Procedural macros are now available.][52081] These kinds of macros allow for
3486 more powerful code generation. There is a [new chapter available][proc-macros]
3487 in the Rust Programming Language book that goes further in depth.
3488 - [You can now use keywords as identifiers using the raw identifiers
3489 syntax (`r#`),][53236] e.g. `let r#for = true;`
3490 - [Using anonymous parameters in traits is now deprecated with a warning and
3491 will be a hard error in the 2018 edition.][53272]
3492 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3493 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3494 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3495 Previously, using a external crate in a module without a use statement
3496 required `let json = ::serde_json::from_str(foo);` but can now be written
3497 as `let json = serde_json::from_str(foo);`.
3498 - [You can now apply the `#[used]` attribute to static items to prevent the
3499 compiler from optimising them away, even if they appear to be unused,][51363]
3500 e.g. `#[used] static FOO: u32 = 1;`
3501 - [You can now import and reexport macros from other crates with the `use`
3502 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3503 the root module of the crate. If your macro relies on calling other local
3504 macros, it is recommended to export with the
3505 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3507 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3508 using the `vis` specifier.][53370]
3509 - [Non-macro attributes now allow all forms of literals, not just
3510 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3511 write `#[attr(true)]`.
3512 - [You can now specify a function to handle a panic in the Rust runtime with the
3513 `#[panic_handler]` attribute.][51366]
3517 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3518 - [Added the `aarch64-unknown-netbsd` target][53165]
3519 - [Upgraded to LLVM 8.][53611]
3523 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3527 - [`Ipv4Addr::BROADCAST`]
3528 - [`Ipv4Addr::LOCALHOST`]
3529 - [`Ipv4Addr::UNSPECIFIED`]
3530 - [`Ipv6Addr::LOCALHOST`]
3531 - [`Ipv6Addr::UNSPECIFIED`]
3532 - [`Iterator::find_map`]
3534 The following methods are replacement methods for `trim_left`, `trim_right`,
3535 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3537 - [`str::trim_end_matches`]
3539 - [`str::trim_start_matches`]
3540 - [`str::trim_start`]
3544 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3545 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3546 equivalent to calling `rustdoc --error-format=json`.
3547 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3551 - [`rustdoc` allows you to specify what edition to treat your code as with the
3552 `--edition` option.][54057]
3553 - [`rustdoc` now has the `--color` (specify whether to output color) and
3554 `--error-format` (specify error format, e.g. `json`) options.][53003]
3555 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3556 debug symbols.][53774]
3557 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3558 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3560 [50911]: https://github.com/rust-lang/rust/pull/50911/
3561 [51363]: https://github.com/rust-lang/rust/pull/51363/
3562 [51366]: https://github.com/rust-lang/rust/pull/51366/
3563 [52081]: https://github.com/rust-lang/rust/pull/52081/
3564 [53003]: https://github.com/rust-lang/rust/pull/53003/
3565 [53033]: https://github.com/rust-lang/rust/pull/53033/
3566 [53044]: https://github.com/rust-lang/rust/pull/53044/
3567 [53165]: https://github.com/rust-lang/rust/pull/53165/
3568 [53611]: https://github.com/rust-lang/rust/pull/53611/
3569 [53213]: https://github.com/rust-lang/rust/pull/53213/
3570 [53236]: https://github.com/rust-lang/rust/pull/53236/
3571 [53272]: https://github.com/rust-lang/rust/pull/53272/
3572 [53370]: https://github.com/rust-lang/rust/pull/53370/
3573 [53459]: https://github.com/rust-lang/rust/pull/53459/
3574 [53774]: https://github.com/rust-lang/rust/pull/53774/
3575 [53822]: https://github.com/rust-lang/rust/pull/53822/
3576 [54057]: https://github.com/rust-lang/rust/pull/54057/
3577 [54146]: https://github.com/rust-lang/rust/pull/54146/
3578 [54404]: https://github.com/rust-lang/rust/pull/54404/
3579 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3580 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3581 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3582 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3584 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3585 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3586 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3587 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3588 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3589 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3590 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3591 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3592 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3593 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3596 Version 1.29.2 (2018-10-11)
3597 ===========================
3599 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3600 - The `rls-preview` component on the windows-gnu targets has been restored.
3602 [54639]: https://github.com/rust-lang/rust/pull/54639
3605 Version 1.29.1 (2018-09-25)
3606 ===========================
3611 - The standard library's `str::repeat` function contained an out of bounds write
3612 caused by an integer overflow. This has been fixed by deterministically
3613 panicking when an overflow happens.
3615 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3619 Version 1.29.0 (2018-09-13)
3620 ==========================
3624 - [Bumped minimum LLVM version to 5.0.][51899]
3625 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3626 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3627 - [Upgraded to LLVM 7.][51966]
3631 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3632 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3633 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3634 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3636 - [`Cell<T>` now allows `T` to be unsized.][50494]
3637 - [`SocketAddr` is now stable on Redox.][52656]
3642 - [`Iterator::flatten`]
3647 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3648 `--locked` to disable this behavior.
3649 - [`cargo-install` will now allow you to cross compile an install
3650 using `--target`.][cargo/5614]
3651 - [Added the `cargo-fix` subcommand to automatically move project code from
3652 2015 edition to 2018.][cargo/5723]
3653 - [`cargo doc` can now optionally document private types using the
3654 `--document-private-items` flag.][cargo/5543]
3658 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3659 the specified level to that level.][52354] For example `--cap-lints warn`
3660 will demote `deny` and `forbid` lints to `warn`.
3661 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3662 fails and `101` if there is a panic.][52197]
3663 - [A preview of clippy has been made available through rustup.][51122]
3664 You can install the preview with `rustup component add clippy-preview`.
3668 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3669 Use `str::get_unchecked(begin..end)` instead.
3670 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3671 Consider using the `home_dir` function from
3672 https://crates.io/crates/dirs instead.
3673 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3674 - [`cfg` attributes and `--cfg` command line flags are now more
3675 strictly validated.][53893]
3677 [53893]: https://github.com/rust-lang/rust/pull/53893/
3678 [52861]: https://github.com/rust-lang/rust/pull/52861/
3679 [51966]: https://github.com/rust-lang/rust/pull/51966/
3680 [52656]: https://github.com/rust-lang/rust/pull/52656/
3681 [52239]: https://github.com/rust-lang/rust/pull/52239/
3682 [52330]: https://github.com/rust-lang/rust/pull/52330/
3683 [52354]: https://github.com/rust-lang/rust/pull/52354/
3684 [52402]: https://github.com/rust-lang/rust/pull/52402/
3685 [52103]: https://github.com/rust-lang/rust/pull/52103/
3686 [52197]: https://github.com/rust-lang/rust/pull/52197/
3687 [51807]: https://github.com/rust-lang/rust/pull/51807/
3688 [51899]: https://github.com/rust-lang/rust/pull/51899/
3689 [51912]: https://github.com/rust-lang/rust/pull/51912/
3690 [51511]: https://github.com/rust-lang/rust/pull/51511/
3691 [51619]: https://github.com/rust-lang/rust/pull/51619/
3692 [51656]: https://github.com/rust-lang/rust/pull/51656/
3693 [51178]: https://github.com/rust-lang/rust/pull/51178/
3694 [51122]: https://github.com/rust-lang/rust/pull/51122
3695 [50494]: https://github.com/rust-lang/rust/pull/50494/
3696 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3697 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3698 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3699 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3700 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3701 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3702 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3705 Version 1.28.0 (2018-08-02)
3706 ===========================
3710 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3711 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3712 the inner type across Foreign Function Interface (FFI) boundaries.
3713 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3714 and can now be used as identifiers.][51196]
3715 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3716 stable.][51241] This will allow users to specify a global allocator for
3718 - [Unit test functions marked with the `#[test]` attribute can now return
3719 `Result<(), E: Debug>` in addition to `()`.][51298]
3720 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3721 allows macros to easily target lifetimes.
3725 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3726 prioritise making smaller binary sizes. `z` is the same as `s` with the
3727 exception that it does not vectorise loops, which typically results in an even
3729 - [The short error format is now stable.][49546] Specified with
3730 `--error-format=short` this option will provide a more compressed output of
3731 rust error messages.
3732 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3733 - [Reduced the number of allocations in the macro parser.][50855] This can
3734 improve compile times of macro heavy crates on average by 5%.
3738 - [Implemented `Default` for `&mut str`.][51306]
3739 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3740 - [Implemented `Extend` for `()`.][50234]
3741 - [The `Debug` implementation of `time::Duration` should now be more easily
3742 human readable.][50364] Previously a `Duration` of one second would printed as
3743 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3744 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3745 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3746 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3747 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3748 for `PathBuf`.][50170]
3749 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3750 and `Wrapping<i128>`.][50465]
3751 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3752 possible.][51050] This can provide up to a 40% speed increase.
3753 - [Improved error messages when using `format!`.][50610]
3757 - [`Iterator::step_by`]
3758 - [`Path::ancestors`]
3759 - [`SystemTime::UNIX_EPOCH`]
3760 - [`alloc::GlobalAlloc`]
3762 - [`alloc::LayoutErr`]
3765 - [`alloc::alloc_zeroed`]
3766 - [`alloc::dealloc`]
3767 - [`alloc::realloc`]
3768 - [`alloc::handle_alloc_error`]
3769 - [`btree_map::Entry::or_default`]
3770 - [`fmt::Alignment`]
3771 - [`hash_map::Entry::or_default`]
3772 - [`iter::repeat_with`]
3773 - [`num::NonZeroUsize`]
3774 - [`num::NonZeroU128`]
3775 - [`num::NonZeroU16`]
3776 - [`num::NonZeroU32`]
3777 - [`num::NonZeroU64`]
3778 - [`num::NonZeroU8`]
3779 - [`ops::RangeBounds`]
3780 - [`slice::SliceIndex`]
3781 - [`slice::from_mut`]
3782 - [`slice::from_ref`]
3783 - [`{Any + Send + Sync}::downcast_mut`]
3784 - [`{Any + Send + Sync}::downcast_ref`]
3785 - [`{Any + Send + Sync}::is`]
3789 - [Cargo will now no longer allow you to publish crates with build scripts that
3790 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3791 considered to be immutable.
3795 - [The `suggestion_applicability` field in `rustc`'s json output is now
3796 stable.][50486] This will allow dev tools to check whether a code suggestion
3797 would apply to them.
3801 - [Rust will consider trait objects with duplicated constraints to be the same
3802 type as without the duplicated constraint.][51276] For example the below code will
3803 now fail to compile.
3808 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3811 impl Trait + Send + Send {
3812 fn test(&self) { println!("two"); }
3816 [49546]: https://github.com/rust-lang/rust/pull/49546/
3817 [50143]: https://github.com/rust-lang/rust/pull/50143/
3818 [50170]: https://github.com/rust-lang/rust/pull/50170/
3819 [50234]: https://github.com/rust-lang/rust/pull/50234/
3820 [50265]: https://github.com/rust-lang/rust/pull/50265/
3821 [50364]: https://github.com/rust-lang/rust/pull/50364/
3822 [50385]: https://github.com/rust-lang/rust/pull/50385/
3823 [50465]: https://github.com/rust-lang/rust/pull/50465/
3824 [50486]: https://github.com/rust-lang/rust/pull/50486/
3825 [50554]: https://github.com/rust-lang/rust/pull/50554/
3826 [50610]: https://github.com/rust-lang/rust/pull/50610/
3827 [50855]: https://github.com/rust-lang/rust/pull/50855/
3828 [51050]: https://github.com/rust-lang/rust/pull/51050/
3829 [51196]: https://github.com/rust-lang/rust/pull/51196/
3830 [51200]: https://github.com/rust-lang/rust/pull/51200/
3831 [51241]: https://github.com/rust-lang/rust/pull/51241/
3832 [51276]: https://github.com/rust-lang/rust/pull/51276/
3833 [51298]: https://github.com/rust-lang/rust/pull/51298/
3834 [51306]: https://github.com/rust-lang/rust/pull/51306/
3835 [51562]: https://github.com/rust-lang/rust/pull/51562/
3836 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3837 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3838 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3839 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3840 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3841 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3842 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3843 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3844 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3845 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3846 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3847 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3848 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3849 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3850 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3851 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3852 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3853 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3854 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3855 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3856 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3857 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3858 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3859 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3860 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3861 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3862 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3863 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3864 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3865 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3867 Version 1.27.2 (2018-07-20)
3868 ===========================
3873 - The borrow checker was fixed to avoid potential unsoundness when using
3874 match ergonomics: [#52213][52213].
3876 [52213]: https://github.com/rust-lang/rust/issues/52213
3878 Version 1.27.1 (2018-07-10)
3879 ===========================
3884 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3885 when running, which enabled executing code as some other user on a
3886 given machine. This release fixes that vulnerability; you can read
3887 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3889 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3894 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3895 match ergonomics: [#51415][51415], [#49534][49534].
3897 [51415]: https://github.com/rust-lang/rust/issues/51415
3898 [49534]: https://github.com/rust-lang/rust/issues/49534
3899 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3900 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3902 Version 1.27.0 (2018-06-21)
3903 ==========================
3907 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3908 be used as an identifier.
3909 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3910 bare `Trait` syntax, and should make it clearer when being used in tandem with
3911 `impl Trait` because it is equivalent to the following syntax:
3912 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3913 `Box<Trait> == Box<dyn Trait>`.
3914 - [Attributes on generic parameters such as types and lifetimes are
3915 now stable.][48851] e.g.
3916 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3917 - [The `#[must_use]` attribute can now also be used on functions as well as
3918 types.][48925] It provides a lint that by default warns users when the
3919 value returned by a function has not been used.
3923 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3927 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3928 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3929 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3930 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3931 the `cfg` attribute.
3932 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3933 std are now available in core.][49896]
3934 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3936 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3937 that the operation isn't done in place.
3938 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3939 the `#[must_use]` attribute][49533] to warn about unused potentially
3940 expensive allocations.
3944 - [`DoubleEndedIterator::rfind`]
3945 - [`DoubleEndedIterator::rfold`]
3946 - [`DoubleEndedIterator::try_rfold`]
3947 - [`Duration::from_micros`]
3948 - [`Duration::from_nanos`]
3949 - [`Duration::subsec_micros`]
3950 - [`Duration::subsec_millis`]
3951 - [`HashMap::remove_entry`]
3952 - [`Iterator::try_fold`]
3953 - [`Iterator::try_for_each`]
3955 - [`Option::filter`]
3956 - [`String::replace_range`]
3957 - [`Take::set_limit`]
3958 - [`hint::unreachable_unchecked`]
3959 - [`os::unix::process::parent_id`]
3960 - [`ptr::swap_nonoverlapping`]
3961 - [`slice::rsplit_mut`]
3963 - [`slice::swap_with_slice`]
3967 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3968 `readme`, and `repository` fields.][cargo/5386]
3969 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3970 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3971 a different directory than `target` for placing compilation artifacts.
3972 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3973 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3974 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3975 where cargo would infer a binary, Cargo will produce a warning. You can
3976 disable this feature ahead of time by setting any of the following to false:
3977 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3978 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3979 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3983 - [Added “The Rustc book” into the official documentation.][49707]
3984 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3985 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3989 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3990 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3991 compile, `"".is_empty()` will still compile.
3992 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3993 will only print the inner type.][48553] E.g.
3994 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3995 not `AtomicBool(true)`.
3996 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3997 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3998 alignment should cover all use cases.
3999 - The `.description()` method on the `std::error::Error` trait
4000 [has been soft-deprecated][50163]. It is no longer required to implement it.
4002 [48553]: https://github.com/rust-lang/rust/pull/48553/
4003 [48851]: https://github.com/rust-lang/rust/pull/48851/
4004 [48925]: https://github.com/rust-lang/rust/pull/48925/
4005 [49533]: https://github.com/rust-lang/rust/pull/49533/
4006 [49623]: https://github.com/rust-lang/rust/pull/49623/
4007 [49630]: https://github.com/rust-lang/rust/pull/49630/
4008 [49664]: https://github.com/rust-lang/rust/pull/49664/
4009 [49699]: https://github.com/rust-lang/rust/pull/49699/
4010 [49707]: https://github.com/rust-lang/rust/pull/49707/
4011 [49719]: https://github.com/rust-lang/rust/pull/49719/
4012 [49896]: https://github.com/rust-lang/rust/pull/49896/
4013 [49968]: https://github.com/rust-lang/rust/pull/49968/
4014 [50163]: https://github.com/rust-lang/rust/pull/50163
4015 [50177]: https://github.com/rust-lang/rust/pull/50177/
4016 [50378]: https://github.com/rust-lang/rust/pull/50378/
4017 [50398]: https://github.com/rust-lang/rust/pull/50398/
4018 [50423]: https://github.com/rust-lang/rust/pull/50423/
4019 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4020 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4021 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4022 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4023 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4024 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4025 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4026 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4027 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4028 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4029 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4030 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4031 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4032 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4033 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4034 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4035 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4036 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4037 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4038 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4039 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4040 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4041 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4042 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4043 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4044 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4045 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4046 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4047 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4048 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4051 Version 1.26.2 (2018-06-05)
4052 ==========================
4057 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4059 [51117]: https://github.com/rust-lang/rust/issues/51117
4062 Version 1.26.1 (2018-05-29)
4063 ==========================
4068 - [RLS now works on Windows.][50646]
4069 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4075 - [`fn main() -> impl Trait` no longer works for non-Termination
4077 This reverts an accidental stabilization.
4078 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4079 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4081 [50646]: https://github.com/rust-lang/rust/issues/50646
4082 [50656]: https://github.com/rust-lang/rust/pull/50656
4083 [50812]: https://github.com/rust-lang/rust/pull/50812
4084 [50950]: https://github.com/rust-lang/rust/issues/50950
4085 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4087 Version 1.26.0 (2018-05-10)
4088 ==========================
4092 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4093 implement either or both traits.][49299]
4094 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4095 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4096 lifetime can be elided.][49458]
4097 - [`impl Trait` is now stable allowing you to have abstract types in returns
4098 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4099 `fn open(path: impl AsRef<Path>)`.
4100 - [Pattern matching will now automatically apply dereferences.][49394]
4101 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4102 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4103 - [A lot of operations are now available in a const context.][46882] E.g. You
4104 can now index into constant arrays, reference and dereference into constants,
4105 and use tuple struct constructors.
4106 - [Fixed entry slice patterns are now stable.][48516] E.g.
4108 let points = [1, 2, 3, 4];
4110 [1, 2, 3, 4] => println!("All points were sequential."),
4111 _ => println!("Not all points were sequential."),
4118 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4119 - [Fixed exponential projection complexity on nested types.][48296]
4120 This can provide up to a ~12% reduction in compile times for certain crates.
4121 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4122 to remap path prefixes outputted by the compiler.
4123 - [Added `powerpc-unknown-netbsd` target.][48281]
4127 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4128 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4129 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4130 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4131 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4132 - [`ascii::escape_default` is now available in libcore.][48735]
4133 - [Trailing commas are now supported in std and core macros.][48056]
4134 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4135 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4140 - [`*const T::copy_to_nonoverlapping`]
4141 - [`*const T::copy_to`]
4142 - [`*const T::read_unaligned`]
4143 - [`*const T::read_volatile`]
4144 - [`*const T::read`]
4146 - [`*const T::wrapping_add`]
4147 - [`*const T::wrapping_sub`]
4149 - [`*mut T::copy_to_nonoverlapping`]
4150 - [`*mut T::copy_to`]
4151 - [`*mut T::read_unaligned`]
4152 - [`*mut T::read_volatile`]
4154 - [`*mut T::replace`]
4157 - [`*mut T::wrapping_add`]
4158 - [`*mut T::wrapping_sub`]
4159 - [`*mut T::write_bytes`]
4160 - [`*mut T::write_unaligned`]
4161 - [`*mut T::write_volatile`]
4164 - [`FromUtf8Error::as_bytes`]
4165 - [`LocalKey::try_with`]
4166 - [`Option::cloned`]
4167 - [`btree_map::Entry::and_modify`]
4168 - [`fs::read_to_string`]
4171 - [`hash_map::Entry::and_modify`]
4172 - [`iter::FusedIterator`]
4173 - [`ops::RangeInclusive`]
4174 - [`ops::RangeToInclusive`]
4176 - [`slice::rotate_left`]
4177 - [`slice::rotate_right`]
4178 - [`String::retain`]
4183 - [Cargo will now output path to custom commands when `-v` is
4184 passed with `--list`][cargo/5041]
4185 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4189 - [The second edition of "The Rust Programming Language" book is now recommended
4190 over the first.][48404]
4195 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4196 syntax is now invalid.
4198 use std::ops::Fn as dyn;
4199 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4201 - [The result of dereferences are no longer promoted to `'static`.][47408]
4205 const PAIR: &(i32, i32) = &(0, 1);
4206 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4209 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4210 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4212 - [Removed hoedown from rustdoc.][48274]
4213 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4215 [46882]: https://github.com/rust-lang/rust/pull/46882
4216 [47379]: https://github.com/rust-lang/rust/pull/47379
4217 [47408]: https://github.com/rust-lang/rust/pull/47408
4218 [47813]: https://github.com/rust-lang/rust/pull/47813
4219 [48056]: https://github.com/rust-lang/rust/pull/48056
4220 [48125]: https://github.com/rust-lang/rust/pull/48125
4221 [48166]: https://github.com/rust-lang/rust/pull/48166
4222 [48235]: https://github.com/rust-lang/rust/pull/48235
4223 [48274]: https://github.com/rust-lang/rust/pull/48274
4224 [48281]: https://github.com/rust-lang/rust/pull/48281
4225 [48296]: https://github.com/rust-lang/rust/pull/48296
4226 [48326]: https://github.com/rust-lang/rust/pull/48326
4227 [48359]: https://github.com/rust-lang/rust/pull/48359
4228 [48404]: https://github.com/rust-lang/rust/pull/48404
4229 [48481]: https://github.com/rust-lang/rust/pull/48481
4230 [48516]: https://github.com/rust-lang/rust/pull/48516
4231 [48628]: https://github.com/rust-lang/rust/pull/48628
4232 [48629]: https://github.com/rust-lang/rust/pull/48629
4233 [48657]: https://github.com/rust-lang/rust/pull/48657
4234 [48735]: https://github.com/rust-lang/rust/pull/48735
4235 [48978]: https://github.com/rust-lang/rust/pull/48978
4236 [49101]: https://github.com/rust-lang/rust/pull/49101
4237 [49109]: https://github.com/rust-lang/rust/pull/49109
4238 [49121]: https://github.com/rust-lang/rust/pull/49121
4239 [49162]: https://github.com/rust-lang/rust/pull/49162
4240 [49184]: https://github.com/rust-lang/rust/pull/49184
4241 [49234]: https://github.com/rust-lang/rust/pull/49234
4242 [49255]: https://github.com/rust-lang/rust/pull/49255
4243 [49299]: https://github.com/rust-lang/rust/pull/49299
4244 [49305]: https://github.com/rust-lang/rust/pull/49305
4245 [49394]: https://github.com/rust-lang/rust/pull/49394
4246 [49458]: https://github.com/rust-lang/rust/pull/49458
4247 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4248 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4249 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4250 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4251 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4252 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4253 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4254 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4255 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4256 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4257 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4258 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4259 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4260 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4261 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4262 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4263 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4264 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4265 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4266 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4267 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4268 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4269 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4270 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4271 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4272 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4273 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4274 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4275 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4276 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4277 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4278 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4279 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4280 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4281 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4282 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4283 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4284 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4285 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4286 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4287 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4288 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4291 Version 1.25.0 (2018-03-29)
4292 ==========================
4296 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4297 - [You can now use nested groups of imports.][47948]
4298 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4299 - [You can now have `|` at the start of a match arm.][47947] e.g.
4301 enum Foo { A, B, C }
4307 | Foo::B => println!("AB"),
4308 | Foo::C => println!("C"),
4315 - [Upgraded to LLVM 6.][47828]
4316 - [Added `-C lto=val` option.][47521]
4317 - [Added `i586-unknown-linux-musl` target][47282]
4321 - [Impl Send for `process::Command` on Unix.][47760]
4322 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4323 - [`UnsafeCell::into_inner` is now safe.][47204]
4324 - [Implement libstd for CloudABI.][47268]
4325 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4326 - [Implement `AsRef<Path>` for Component][46985]
4327 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4328 - [Moved `Duration` to libcore.][46666]
4332 - [`Location::column`]
4335 The following functions can now be used in a constant expression.
4336 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4337 - [`Duration::new`][47300]
4338 - [`Duration::from_secs`][47300]
4339 - [`Duration::from_millis`][47300]
4343 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4344 - [`cargo new` now defaults to creating a binary crate, instead of a
4345 library crate.][cargo/5029]
4349 - [Rust by example is now shipped with new releases][46196]
4353 - [Deprecated `net::lookup_host`.][47510]
4354 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4355 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4356 around indexing operations (see [#47349][47349]). This has been fixed (which also
4357 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4358 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4360 [33903]: https://github.com/rust-lang/rust/pull/33903
4361 [47947]: https://github.com/rust-lang/rust/pull/47947
4362 [47948]: https://github.com/rust-lang/rust/pull/47948
4363 [47760]: https://github.com/rust-lang/rust/pull/47760
4364 [47790]: https://github.com/rust-lang/rust/pull/47790
4365 [47828]: https://github.com/rust-lang/rust/pull/47828
4366 [47398]: https://github.com/rust-lang/rust/pull/47398
4367 [47510]: https://github.com/rust-lang/rust/pull/47510
4368 [47521]: https://github.com/rust-lang/rust/pull/47521
4369 [47204]: https://github.com/rust-lang/rust/pull/47204
4370 [47251]: https://github.com/rust-lang/rust/pull/47251
4371 [47268]: https://github.com/rust-lang/rust/pull/47268
4372 [47282]: https://github.com/rust-lang/rust/pull/47282
4373 [47300]: https://github.com/rust-lang/rust/pull/47300
4374 [47349]: https://github.com/rust-lang/rust/pull/47349
4375 [46931]: https://github.com/rust-lang/rust/pull/46931
4376 [46985]: https://github.com/rust-lang/rust/pull/46985
4377 [47006]: https://github.com/rust-lang/rust/pull/47006
4378 [46830]: https://github.com/rust-lang/rust/pull/46830
4379 [46095]: https://github.com/rust-lang/rust/pull/46095
4380 [46666]: https://github.com/rust-lang/rust/pull/46666
4381 [46196]: https://github.com/rust-lang/rust/pull/46196
4382 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4383 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4384 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4385 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4386 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4389 Version 1.24.1 (2018-03-01)
4390 ==========================
4392 - [Do not abort when unwinding through FFI][48251]
4393 - [Emit UTF-16 files for linker arguments on Windows][48318]
4394 - [Make the error index generator work again][48308]
4395 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4397 [48251]: https://github.com/rust-lang/rust/issues/48251
4398 [48308]: https://github.com/rust-lang/rust/issues/48308
4399 [48318]: https://github.com/rust-lang/rust/issues/48318
4400 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4403 Version 1.24.0 (2018-02-15)
4404 ==========================
4408 - [External `sysv64` ffi is now available.][46528]
4409 eg. `extern "sysv64" fn foo () {}`
4413 - [rustc now uses 16 codegen units by default for release builds.][46910]
4414 For the fastest builds, utilize `codegen-units=1`.
4415 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4416 - [Add `aarch64-unknown-openbsd` support][46760]
4420 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4421 improvement in performance in the majority of cases.
4422 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4423 with Windows.][46798]
4424 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4425 - [impl `From<bool>` for `AtomicBool`][46293]
4426 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4427 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4428 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4429 - [float::from_bits now just uses transmute.][46012] This provides
4430 some optimisations from LLVM.
4431 - [Copied `AsciiExt` methods onto `char`][46077]
4432 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4433 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4434 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4435 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4439 - [`RefCell::replace`]
4441 - [`atomic::spin_loop_hint`]
4443 The following functions can now be used in a constant expression.
4444 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4446 - [`AtomicBool::new`][46287]
4447 - [`AtomicUsize::new`][46287]
4448 - [`AtomicIsize::new`][46287]
4449 - [`AtomicPtr::new`][46287]
4450 - [`Cell::new`][46287]
4451 - [`{integer}::min_value`][46287]
4452 - [`{integer}::max_value`][46287]
4453 - [`mem::size_of`][46287]
4454 - [`mem::align_of`][46287]
4455 - [`ptr::null`][46287]
4456 - [`ptr::null_mut`][46287]
4457 - [`RefCell::new`][46287]
4458 - [`UnsafeCell::new`][46287]
4462 - [Added a `workspace.default-members` config that
4463 overrides implied `--all` in virtual workspaces.][cargo/4743]
4464 - [Enable incremental by default on development builds.][cargo/4817] Also added
4465 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4466 per-project or global basis respectively.
4473 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4474 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4475 in accordance with IETF RFC 4291 §2.2.
4476 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4477 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4478 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4479 - [Leading zeros in tuple struct members is now an error][47084]
4480 - [`column!()` macro is one-based instead of zero-based][46977]
4481 - [`fmt::Arguments` can no longer be shared across threads][45198]
4482 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4483 - [Cargo sets a different working directory for the compiler][cargo/4788]
4485 [44884]: https://github.com/rust-lang/rust/pull/44884
4486 [45198]: https://github.com/rust-lang/rust/pull/45198
4487 [45506]: https://github.com/rust-lang/rust/pull/45506
4488 [45904]: https://github.com/rust-lang/rust/pull/45904
4489 [45990]: https://github.com/rust-lang/rust/pull/45990
4490 [46012]: https://github.com/rust-lang/rust/pull/46012
4491 [46077]: https://github.com/rust-lang/rust/pull/46077
4492 [46094]: https://github.com/rust-lang/rust/pull/46094
4493 [46284]: https://github.com/rust-lang/rust/pull/46284
4494 [46287]: https://github.com/rust-lang/rust/pull/46287
4495 [46293]: https://github.com/rust-lang/rust/pull/46293
4496 [46528]: https://github.com/rust-lang/rust/pull/46528
4497 [46671]: https://github.com/rust-lang/rust/pull/46671
4498 [46713]: https://github.com/rust-lang/rust/pull/46713
4499 [46735]: https://github.com/rust-lang/rust/pull/46735
4500 [46749]: https://github.com/rust-lang/rust/pull/46749
4501 [46760]: https://github.com/rust-lang/rust/pull/46760
4502 [46798]: https://github.com/rust-lang/rust/pull/46798
4503 [46828]: https://github.com/rust-lang/rust/pull/46828
4504 [46831]: https://github.com/rust-lang/rust/pull/46831
4505 [46833]: https://github.com/rust-lang/rust/pull/46833
4506 [46910]: https://github.com/rust-lang/rust/pull/46910
4507 [46977]: https://github.com/rust-lang/rust/pull/46977
4508 [47018]: https://github.com/rust-lang/rust/pull/47018
4509 [47080]: https://github.com/rust-lang/rust/pull/47080
4510 [47084]: https://github.com/rust-lang/rust/pull/47084
4511 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4512 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4513 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4514 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4515 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4516 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4519 Version 1.23.0 (2018-01-04)
4520 ==========================
4524 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4525 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4526 Which should fix some confusing errors in some operations.
4530 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4531 undefined behavior.][45920]
4532 - [rustc now suggests renaming import if names clash.][45660]
4533 - [Display errors/warnings correctly when there are zero-width or
4534 wide characters.][45711]
4535 - [rustc now avoids unnecessary copies of arguments that are
4536 simple bindings][45380] This should improve memory usage on average by 5-10%.
4537 - [Updated musl used to build musl rustc to 1.1.17][45393]
4541 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4542 - [Implement Hash for raw pointers to unsized types][45483]
4543 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4544 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4545 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4546 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4547 and `<*mut T>::as_mut`][44932]
4548 - [Optimized `Thread::{park, unpark}` implementation][45524]
4549 - [Improved `SliceExt::binary_search` performance.][45333]
4550 - [impl `FromIterator<()>` for `()`][45379]
4551 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4559 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4560 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4561 - [Added unit test checking to `cargo check`][cargo/4592]
4562 - [Cargo now lets you install a specific version
4563 using `cargo install --version`][cargo/4637]
4567 - [Releases now ship with the Cargo book documentation.][45692]
4568 - [rustdoc now prints rendering warnings on every run.][45324]
4572 - [Changes have been made to type equality to make it more correct,
4573 in rare cases this could break some code.][45853] [Tracking issue for
4574 further information][45852]
4575 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4576 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4577 Android 9, the minimum supported version is Android 14.
4578 - [Bumped the minimum LLVM to 3.9][45326]
4580 [44042]: https://github.com/rust-lang/rust/pull/44042
4581 [44932]: https://github.com/rust-lang/rust/pull/44932
4582 [45267]: https://github.com/rust-lang/rust/pull/45267
4583 [45324]: https://github.com/rust-lang/rust/pull/45324
4584 [45326]: https://github.com/rust-lang/rust/pull/45326
4585 [45333]: https://github.com/rust-lang/rust/pull/45333
4586 [45379]: https://github.com/rust-lang/rust/pull/45379
4587 [45380]: https://github.com/rust-lang/rust/pull/45380
4588 [45393]: https://github.com/rust-lang/rust/pull/45393
4589 [45435]: https://github.com/rust-lang/rust/pull/45435
4590 [45483]: https://github.com/rust-lang/rust/pull/45483
4591 [45524]: https://github.com/rust-lang/rust/pull/45524
4592 [45571]: https://github.com/rust-lang/rust/pull/45571
4593 [45580]: https://github.com/rust-lang/rust/pull/45580
4594 [45610]: https://github.com/rust-lang/rust/pull/45610
4595 [45660]: https://github.com/rust-lang/rust/pull/45660
4596 [45692]: https://github.com/rust-lang/rust/pull/45692
4597 [45711]: https://github.com/rust-lang/rust/pull/45711
4598 [45772]: https://github.com/rust-lang/rust/pull/45772
4599 [45852]: https://github.com/rust-lang/rust/issues/45852
4600 [45853]: https://github.com/rust-lang/rust/pull/45853
4601 [45887]: https://github.com/rust-lang/rust/pull/45887
4602 [45920]: https://github.com/rust-lang/rust/pull/45920
4603 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4604 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4605 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4608 Version 1.22.1 (2017-11-22)
4609 ==========================
4611 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4613 [46183]: https://github.com/rust-lang/rust/pull/46183
4615 Version 1.22.0 (2017-11-22)
4616 ==========================
4620 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4621 - [Now accepts underscores in unicode escapes][43716]
4622 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4623 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4627 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4628 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4629 This should decrease compile times for debug builds.
4630 - [strict memory alignment now enabled on ARMv6][45094]
4631 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4635 - [Allow atomic operations up to 32 bits
4636 on `armv5te_unknown_linux_gnueabi`][44978]
4637 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4638 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4639 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4640 - [Properly detect overflow in `Instant += Duration`.][44220]
4641 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4642 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4643 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4650 - [Cargo will now build multi file examples in subdirectories of the `examples`
4651 folder that have a `main.rs` file.][cargo/4496]
4652 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4653 the old format will continue to work and can be updated with `cargo update`.
4654 - [Now supports vendoring git repositories][cargo/3992]
4658 - [`libbacktrace` is now available on Apple platforms.][44251]
4659 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4660 This now lets you specify that a given code example will fail to compile.
4664 - [The minimum Android version that rustc can build for has been bumped
4665 to `4.0` from `2.3`][45656]
4666 - [Allowing `T op= &T` for numeric types has broken some type
4667 inference cases][45480]
4670 [42526]: https://github.com/rust-lang/rust/pull/42526
4671 [43017]: https://github.com/rust-lang/rust/pull/43017
4672 [43716]: https://github.com/rust-lang/rust/pull/43716
4673 [43949]: https://github.com/rust-lang/rust/pull/43949
4674 [44015]: https://github.com/rust-lang/rust/pull/44015
4675 [44220]: https://github.com/rust-lang/rust/pull/44220
4676 [44251]: https://github.com/rust-lang/rust/pull/44251
4677 [44287]: https://github.com/rust-lang/rust/pull/44287
4678 [44303]: https://github.com/rust-lang/rust/pull/44303
4679 [44456]: https://github.com/rust-lang/rust/pull/44456
4680 [44466]: https://github.com/rust-lang/rust/pull/44466
4681 [44895]: https://github.com/rust-lang/rust/pull/44895
4682 [44966]: https://github.com/rust-lang/rust/pull/44966
4683 [44978]: https://github.com/rust-lang/rust/pull/44978
4684 [45041]: https://github.com/rust-lang/rust/pull/45041
4685 [45064]: https://github.com/rust-lang/rust/pull/45064
4686 [45075]: https://github.com/rust-lang/rust/pull/45075
4687 [45094]: https://github.com/rust-lang/rust/pull/45094
4688 [45095]: https://github.com/rust-lang/rust/pull/45095
4689 [45480]: https://github.com/rust-lang/rust/issues/45480
4690 [45656]: https://github.com/rust-lang/rust/pull/45656
4691 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4692 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4693 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4700 Version 1.21.0 (2017-10-12)
4701 ==========================
4705 - [You can now use static references for literals.][43838]
4709 let x: &'static u32 = &0;
4712 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4715 my_macro!(Vec<i32>::new); // Always worked
4716 my_macro!(Vec::<i32>::new); // Now works
4721 - [Upgraded jemalloc to 4.5.0][43911]
4722 - [Enabled unwinding panics on Redox][43917]
4723 - [Now runs LLVM in parallel during translation phase.][43506]
4724 This should reduce peak memory usage.
4728 - [Generate builtin impls for `Clone` for all arrays and tuples that
4729 are `T: Clone`][43690]
4730 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4731 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4732 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4737 [`std::mem::discriminant`]
4741 - [You can now call `cargo install` with multiple package names][cargo/4216]
4742 - [Cargo commands inside a virtual workspace will now implicitly
4743 pass `--all`][cargo/4335]
4744 - [Added a `[patch]` section to `Cargo.toml` to handle
4745 prepublication dependencies][cargo/4123] [RFC 1969]
4746 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4747 like patterns][cargo/4270]
4748 - [Added the `--all-targets` option][cargo/4400]
4749 - [Using required dependencies as a feature is now deprecated and emits
4750 a warning][cargo/4364]
4755 - [Cargo docs are moving][43916]
4756 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4757 - [The rustdoc book is now available][43863]
4758 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4759 - [Added a preview of RLS has been made available through rustup][44204]
4760 Install with `rustup component add rls-preview`
4761 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4762 Previously only showed `std::os::unix`.
4766 - [Changes in method matching against higher-ranked types][43880] This may cause
4767 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4768 - [rustc's JSON error output's byte position start at top of file.][42973]
4769 Was previously relative to the rustc's internal `CodeMap` struct which
4770 required the unstable library `libsyntax` to correctly use.
4771 - [`unused_results` lint no longer ignores booleans][43728]
4773 [42565]: https://github.com/rust-lang/rust/pull/42565
4774 [42973]: https://github.com/rust-lang/rust/pull/42973
4775 [43348]: https://github.com/rust-lang/rust/pull/43348
4776 [43459]: https://github.com/rust-lang/rust/pull/43459
4777 [43506]: https://github.com/rust-lang/rust/pull/43506
4778 [43540]: https://github.com/rust-lang/rust/pull/43540
4779 [43690]: https://github.com/rust-lang/rust/pull/43690
4780 [43728]: https://github.com/rust-lang/rust/pull/43728
4781 [43838]: https://github.com/rust-lang/rust/pull/43838
4782 [43863]: https://github.com/rust-lang/rust/pull/43863
4783 [43880]: https://github.com/rust-lang/rust/pull/43880
4784 [43911]: https://github.com/rust-lang/rust/pull/43911
4785 [43916]: https://github.com/rust-lang/rust/pull/43916
4786 [43917]: https://github.com/rust-lang/rust/pull/43917
4787 [44204]: https://github.com/rust-lang/rust/pull/44204
4788 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4789 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4790 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4791 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4792 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4793 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4794 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4795 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4796 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4798 Version 1.20.0 (2017-08-31)
4799 ===========================
4803 - [Associated constants are now stabilised.][42809]
4804 - [A lot of macro bugs are now fixed.][42913]
4809 - [Struct fields are now properly coerced to the expected field type.][42807]
4810 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4811 `wasm32-experimental-emscripten` target.
4812 - [Changed some of the error messages to be more helpful.][42033]
4813 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4815 - [rustc now reports the total number of errors on compilation failure][43015]
4816 previously this was only the number of errors in the pass that failed.
4817 - [Expansion in rustc has been sped up 29x.][42533]
4818 - [added `msp430-none-elf` target.][43099]
4819 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4821 - [Fixes backtraces on Redox][43228]
4822 - [rustc now identifies different versions of same crate when absolute paths of
4823 different types match in an error message.][42826]
4829 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4830 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4832 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4833 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4834 - [Impl `Clone` for `DefaultHasher`.][42799]
4835 - [Impl `Sync` for `SyncSender`.][42397]
4836 - [Impl `FromStr` for `char`][42271]
4837 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4839 - [allow messages in the `unimplemented!()` macro.][42155]
4840 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4841 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4842 - [Upgrade to Unicode 10.0.0][42999]
4843 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4844 - [Skip the main thread's manual stack guard on Linux][43072]
4845 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4846 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4848 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4853 - [`CStr::into_c_string`]
4854 - [`CString::as_c_str`]
4855 - [`CString::into_boxed_c_str`]
4856 - [`Chain::get_mut`]
4857 - [`Chain::get_ref`]
4858 - [`Chain::into_inner`]
4859 - [`Option::get_or_insert_with`]
4860 - [`Option::get_or_insert`]
4861 - [`OsStr::into_os_string`]
4862 - [`OsString::into_boxed_os_str`]
4865 - [`Utf8Error::error_len`]
4866 - [`char::EscapeDebug`]
4867 - [`char::escape_debug`]
4868 - [`compile_error!`]
4869 - [`f32::from_bits`]
4871 - [`f64::from_bits`]
4873 - [`mem::ManuallyDrop`]
4874 - [`slice::sort_unstable_by_key`]
4875 - [`slice::sort_unstable_by`]
4876 - [`slice::sort_unstable`]
4877 - [`str::from_boxed_utf8_unchecked`]
4878 - [`str::as_bytes_mut`]
4879 - [`str::as_bytes_mut`]
4880 - [`str::from_utf8_mut`]
4881 - [`str::from_utf8_unchecked_mut`]
4883 - [`str::get_unchecked_mut`]
4884 - [`str::get_unchecked`]
4886 - [`str::into_boxed_bytes`]
4891 - [Cargo API token location moved from `~/.cargo/config` to
4892 `~/.cargo/credentials`.][cargo/3978]
4893 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4894 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4895 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4896 - [You can now specify version of a binary when installed through
4897 `cargo install` using `--vers`.][cargo/4229]
4898 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4899 failure.][cargo/4248]
4900 - [Changed the convention around which file is the crate root.][cargo/4259]
4901 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4902 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4907 - [Functions with `'static` in their return types will now not be as usable as
4908 if they were using lifetime parameters instead.][42417]
4909 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4910 takes the sign of NaN into account where previously didn't.][42430]
4912 [42033]: https://github.com/rust-lang/rust/pull/42033
4913 [42155]: https://github.com/rust-lang/rust/pull/42155
4914 [42271]: https://github.com/rust-lang/rust/pull/42271
4915 [42397]: https://github.com/rust-lang/rust/pull/42397
4916 [42417]: https://github.com/rust-lang/rust/pull/42417
4917 [42430]: https://github.com/rust-lang/rust/pull/42430
4918 [42431]: https://github.com/rust-lang/rust/pull/42431
4919 [42533]: https://github.com/rust-lang/rust/pull/42533
4920 [42571]: https://github.com/rust-lang/rust/pull/42571
4921 [42613]: https://github.com/rust-lang/rust/pull/42613
4922 [42799]: https://github.com/rust-lang/rust/pull/42799
4923 [42807]: https://github.com/rust-lang/rust/pull/42807
4924 [42809]: https://github.com/rust-lang/rust/pull/42809
4925 [42822]: https://github.com/rust-lang/rust/pull/42822
4926 [42826]: https://github.com/rust-lang/rust/pull/42826
4927 [42854]: https://github.com/rust-lang/rust/pull/42854
4928 [42913]: https://github.com/rust-lang/rust/pull/42913
4929 [42999]: https://github.com/rust-lang/rust/pull/42999
4930 [43011]: https://github.com/rust-lang/rust/pull/43011
4931 [43015]: https://github.com/rust-lang/rust/pull/43015
4932 [43072]: https://github.com/rust-lang/rust/pull/43072
4933 [43077]: https://github.com/rust-lang/rust/pull/43077
4934 [43097]: https://github.com/rust-lang/rust/pull/43097
4935 [43099]: https://github.com/rust-lang/rust/pull/43099
4936 [43170]: https://github.com/rust-lang/rust/pull/43170
4937 [43178]: https://github.com/rust-lang/rust/pull/43178
4938 [43185]: https://github.com/rust-lang/rust/pull/43185
4939 [43228]: https://github.com/rust-lang/rust/pull/43228
4940 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4941 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4942 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4943 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4944 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4945 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4946 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4947 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4948 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4949 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4950 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4951 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4952 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4953 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4954 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4955 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4956 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4957 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4958 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4959 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4960 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4961 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4962 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4963 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4964 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4965 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4966 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4967 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4968 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4969 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4970 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4971 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4972 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4973 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4974 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4975 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4976 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4977 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4978 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4981 Version 1.19.0 (2017-07-20)
4982 ===========================
4987 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4988 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4989 - [Macro recursion limit increased to 1024 from 64.][41676]
4990 - [Added lint for detecting unused macros.][41907]
4991 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4992 For example: `let x = loop { break 7; };`
4993 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4994 contain `Copy` types and cannot have a `Drop` implementation.
4995 Example: `union Foo { bar: u8, baz: usize }`
4996 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4997 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5002 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5003 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5004 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5005 you should use `--target armv7-linux-androideabi`.
5006 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5007 - [Minor optimisation of string operations.][42037]
5008 - [Compiler error message is now `aborting due to previous error(s)` instead of
5009 `aborting due to N previous errors`][42150] This was previously inaccurate and
5010 would only count certain kinds of errors.
5011 - [The compiler now supports Visual Studio 2017][42225]
5012 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5013 - [Added a lot][42264] of [new error codes][42302]
5014 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5015 libraries with C Run-time Libraries(CRT) to be statically linked.
5016 - [Fixed various ARM codegen bugs][42740]
5021 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5022 `Extend<Cow<'a, str>>`][41449]
5023 - [`Vec` now implements `From<&mut [T]>`][41530]
5024 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5025 - [`SplitWhitespace` now implements `Clone`][41659]
5026 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5028 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5029 macros, but for printing to stderr.
5034 - [`OsString::shrink_to_fit`]
5037 - [`thread::ThreadId`]
5042 - [Build scripts can now add environment variables to the environment
5043 the crate is being compiled in.
5044 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5045 - [Subcommands now replace the current process rather than spawning a new
5046 child process][cargo/3970]
5047 - [Workspace members can now accept glob file patterns][cargo/3979]
5048 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5049 the members in a given workspace.][cargo/3988]
5050 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5051 - [Target directory path is now in the cargo metadata][cargo/4022]
5052 - [Cargo no longer checks out a local working directory for the
5053 crates.io index][cargo/4026] This should provide smaller file size for the
5054 registry, and improve cloning times, especially on Windows machines.
5055 - [Added an `--exclude` option for excluding certain packages when using the
5056 `--all` option][cargo/4031]
5057 - [Cargo will now automatically retry when receiving a 5xx error
5058 from crates.io][cargo/4032]
5059 - [The `--features` option now accepts multiple comma or space
5060 delimited values.][cargo/4084]
5061 - [Added support for custom target specific runners][cargo/3954]
5066 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5068 - [Rust will now release XZ compressed packages][rust-installer/57]
5069 - [rustup will now prefer to download rust packages with
5070 XZ compression][rustup/1100] over GZip packages.
5071 - [Added the ability to escape `#` in rust documentation][41785] By adding
5072 additional `#`'s ie. `##` is now `#`
5077 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5078 - [`-Z` flags are now no longer allowed to be used on the stable
5079 compiler.][41751] This has been a warning for a year previous to this.
5080 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5081 longer works][42844]. Users should migrate to the built-in `check`
5082 command, which has been available since 1.16.
5083 - [Ending a float literal with `._` is now a hard error.
5084 Example: `42._` .][41946]
5085 - [Any use of a private `extern crate` outside of its module is now a
5086 hard error.][36886] This was previously a warning.
5087 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5088 relative while the `::` prefix makes a path absolute, but was ignored and the
5089 path was relative regardless.
5090 - [Floating point constants in match patterns is now a hard error][36890]
5091 This was previously a warning.
5092 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5093 match patterns is now a hard error][36891] This was previously a warning.
5094 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5096 - [From the pound escape, lines consisting of multiple `#`s are
5098 - [It is an error to re-export private enum variants][42460]. This is
5099 known to break a number of crates that depend on an older version of
5101 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5102 to use it to find the linker, and the build will fail where it did
5103 not previously][42607]
5105 [36886]: https://github.com/rust-lang/rust/issues/36886
5106 [36888]: https://github.com/rust-lang/rust/issues/36888
5107 [36890]: https://github.com/rust-lang/rust/issues/36890
5108 [36891]: https://github.com/rust-lang/rust/issues/36891
5109 [36892]: https://github.com/rust-lang/rust/issues/36892
5110 [37406]: https://github.com/rust-lang/rust/issues/37406
5111 [39983]: https://github.com/rust-lang/rust/pull/39983
5112 [41145]: https://github.com/rust-lang/rust/pull/41145
5113 [41192]: https://github.com/rust-lang/rust/pull/41192
5114 [41258]: https://github.com/rust-lang/rust/pull/41258
5115 [41370]: https://github.com/rust-lang/rust/pull/41370
5116 [41449]: https://github.com/rust-lang/rust/pull/41449
5117 [41530]: https://github.com/rust-lang/rust/pull/41530
5118 [41624]: https://github.com/rust-lang/rust/pull/41624
5119 [41656]: https://github.com/rust-lang/rust/pull/41656
5120 [41659]: https://github.com/rust-lang/rust/pull/41659
5121 [41676]: https://github.com/rust-lang/rust/pull/41676
5122 [41751]: https://github.com/rust-lang/rust/pull/41751
5123 [41764]: https://github.com/rust-lang/rust/pull/41764
5124 [41785]: https://github.com/rust-lang/rust/pull/41785
5125 [41873]: https://github.com/rust-lang/rust/pull/41873
5126 [41907]: https://github.com/rust-lang/rust/pull/41907
5127 [41946]: https://github.com/rust-lang/rust/pull/41946
5128 [42016]: https://github.com/rust-lang/rust/pull/42016
5129 [42037]: https://github.com/rust-lang/rust/pull/42037
5130 [42068]: https://github.com/rust-lang/rust/pull/42068
5131 [42150]: https://github.com/rust-lang/rust/pull/42150
5132 [42162]: https://github.com/rust-lang/rust/pull/42162
5133 [42225]: https://github.com/rust-lang/rust/pull/42225
5134 [42264]: https://github.com/rust-lang/rust/pull/42264
5135 [42302]: https://github.com/rust-lang/rust/pull/42302
5136 [42460]: https://github.com/rust-lang/rust/issues/42460
5137 [42607]: https://github.com/rust-lang/rust/issues/42607
5138 [42740]: https://github.com/rust-lang/rust/pull/42740
5139 [42844]: https://github.com/rust-lang/rust/issues/42844
5140 [42948]: https://github.com/rust-lang/rust/pull/42948
5141 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5142 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5143 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5144 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5145 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5146 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5147 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5148 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5149 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5150 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5151 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5152 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5153 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5154 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5155 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5156 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5157 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5158 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5159 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5160 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5161 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5162 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5165 Version 1.18.0 (2017-06-08)
5166 ===========================
5171 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5172 make the item visible to just that module tree. Also accepts the keyword
5173 `crate` to make something public to the whole crate but not users of the
5174 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5175 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5176 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5177 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5178 types like `Write + Send`, trailing `+` are now supported in trait objects,
5179 and better error reporting for trait objects starting with `?Sized`.
5180 - [0e+10 is now a valid floating point literal][40589]
5181 - [Now warns if you bind a lifetime parameter to 'static][40734]
5182 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5183 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5184 representation in some cases.][40377]
5189 - [rustc can now emit mir with `--emit mir`][39891]
5190 - [Improved LLVM IR for trivial functions][40367]
5191 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5192 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5193 opportunities found through profiling
5194 - [Improved backtrace formatting when panicking][38165]
5199 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5200 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5201 iteration or reallocation.
5202 - [Simplified HashMap Bucket interface][40561] provides performance
5203 improvements for iterating and cloning.
5204 - [Specialize Vec::from_elem to use calloc][40409]
5205 - [Fixed Race condition in fs::create_dir_all][39799]
5206 - [No longer caching stdio on Windows][40516]
5207 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5208 2.50%~ faster and in one case now 12.50% faster.
5209 - [Optimized `AtomicBool::fetch_nand`][41143]
5214 - [`Child::try_wait`]
5215 - [`HashMap::retain`]
5216 - [`HashSet::retain`]
5218 - [`TcpStream::peek`]
5219 - [`UdpSocket::peek`]
5220 - [`UdpSocket::peek_from`]
5225 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5226 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5227 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5228 - [Added Android build support][cargo/3885]
5229 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5230 of a certain type, for example `cargo build --bins` will build all
5232 - [Added support for haiku][cargo/3952]
5237 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5238 - [Added rust-windbg script for better debugging on Windows][39983]
5239 - [Rust now uses the official cross compiler for NetBSD][40612]
5240 - [rustdoc now accepts `#` at the start of files][40828]
5241 - [Fixed jemalloc support for musl][41168]
5246 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5247 always placed after the sign if it exists and before the digits. With the `#`
5248 flag the zeroes are placed after the prefix and before the digits.
5249 - [Due to the struct field optimisation][40377], using `transmute` on structs
5250 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5251 always been undefined behavior, but is now more likely to break in practice.
5252 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5253 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5254 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5255 - [Overlapping inherent `impl`s are now a hard error][40728]
5256 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5257 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5258 `out.asm` and `out.ll` instead of only one of the filetypes.
5259 - [ calling a function that returns `Self` will no longer work][41805] when
5260 the size of `Self` cannot be statically determined.
5261 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5262 this has caused a few regressions namely:
5264 - Changed the link order of local static/dynamic libraries (respecting the
5265 order on given rather than having the compiler reorder).
5266 - Changed how MinGW is linked, native code linked to dynamic libraries
5267 may require manually linking to the gcc support library (for the native
5270 [38165]: https://github.com/rust-lang/rust/pull/38165
5271 [39799]: https://github.com/rust-lang/rust/pull/39799
5272 [39891]: https://github.com/rust-lang/rust/pull/39891
5273 [39983]: https://github.com/rust-lang/rust/pull/39983
5274 [40043]: https://github.com/rust-lang/rust/pull/40043
5275 [40241]: https://github.com/rust-lang/rust/pull/40241
5276 [40338]: https://github.com/rust-lang/rust/pull/40338
5277 [40367]: https://github.com/rust-lang/rust/pull/40367
5278 [40377]: https://github.com/rust-lang/rust/pull/40377
5279 [40409]: https://github.com/rust-lang/rust/pull/40409
5280 [40516]: https://github.com/rust-lang/rust/pull/40516
5281 [40556]: https://github.com/rust-lang/rust/pull/40556
5282 [40561]: https://github.com/rust-lang/rust/pull/40561
5283 [40589]: https://github.com/rust-lang/rust/pull/40589
5284 [40612]: https://github.com/rust-lang/rust/pull/40612
5285 [40723]: https://github.com/rust-lang/rust/pull/40723
5286 [40728]: https://github.com/rust-lang/rust/pull/40728
5287 [40731]: https://github.com/rust-lang/rust/pull/40731
5288 [40734]: https://github.com/rust-lang/rust/pull/40734
5289 [40805]: https://github.com/rust-lang/rust/pull/40805
5290 [40807]: https://github.com/rust-lang/rust/pull/40807
5291 [40828]: https://github.com/rust-lang/rust/pull/40828
5292 [40870]: https://github.com/rust-lang/rust/pull/40870
5293 [41085]: https://github.com/rust-lang/rust/pull/41085
5294 [41143]: https://github.com/rust-lang/rust/pull/41143
5295 [41168]: https://github.com/rust-lang/rust/pull/41168
5296 [41270]: https://github.com/rust-lang/rust/issues/41270
5297 [41469]: https://github.com/rust-lang/rust/pull/41469
5298 [41805]: https://github.com/rust-lang/rust/issues/41805
5299 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5300 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5301 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5302 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5303 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5304 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5305 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5306 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5307 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5308 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5309 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5310 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5311 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5312 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5315 Version 1.17.0 (2017-04-27)
5316 ===========================
5321 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5322 * [Fields of structs may be initialized without duplicating the field/variable
5323 names][39761]. [RFC 1682]
5324 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5325 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5326 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5327 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5328 `'b`. Soundness fix.
5329 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5330 * [Static variables may contain references to other statics][40027]
5335 * [Exit quickly on only `--emit dep-info`][40336]
5336 * [Make `-C relocation-model` more correctly determine whether the linker
5337 creates a position-independent executable][40245]
5338 * [Add `-C overflow-checks` to directly control whether integer overflow
5340 * [The rustc type checker now checks items on demand instead of in a single
5341 in-order pass][40008]. This is mostly an internal refactoring in support of
5342 future work, including incremental type checking, but also resolves [RFC
5343 1647], allowing `Self` to appear in `impl` `where` clauses.
5344 * [Optimize vtable loads][39995]
5345 * [Turn off vectorization for Emscripten targets][39990]
5346 * [Provide suggestions for unknown macros imported with `use`][39953]
5347 * [Fix ICEs in path resolution][39939]
5348 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5349 * [Add clearer error message using `&str + &str`][39116]
5360 * [`Ordering::then`]
5361 * [`Ordering::then_with`]
5362 * [`BTreeMap::range`]
5363 * [`BTreeMap::range_mut`]
5364 * [`collections::Bound`]
5365 * [`process::abort`]
5366 * [`ptr::read_unaligned`]
5367 * [`ptr::write_unaligned`]
5368 * [`Result::expect_err`]
5371 * [`Cell::into_inner`]
5377 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5378 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5379 * [`String` implements `FromIterator<&char>`][40028]
5380 * `Box` [implements][40009] a number of new conversions:
5381 `From<Box<str>> for String`,
5382 `From<Box<[T]>> for Vec<T>`,
5383 `From<Box<CStr>> for CString`,
5384 `From<Box<OsStr>> for OsString`,
5385 `From<Box<Path>> for PathBuf`,
5386 `Into<Box<str>> for String`,
5387 `Into<Box<[T]>> for Vec<T>`,
5388 `Into<Box<CStr>> for CString`,
5389 `Into<Box<OsStr>> for OsString`,
5390 `Into<Box<Path>> for PathBuf`,
5391 `Default for Box<str>`,
5392 `Default for Box<CStr>`,
5393 `Default for Box<OsStr>`,
5394 `From<&CStr> for Box<CStr>`,
5395 `From<&OsStr> for Box<OsStr>`,
5396 `From<&Path> for Box<Path>`
5397 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5398 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5399 * [Slightly optimize `slice::sort`][39538]
5400 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5401 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5402 `Box<str>` implements `From<&str>`][39438]
5403 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5404 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5405 * [`format!` estimates the needed capacity before writing a string][39356]
5406 * [Support unprivileged symlink creation in Windows][38921]
5407 * [`PathBuf` implements `Default`][38764]
5408 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5409 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5410 and poor hash functions.
5415 * [Add `cargo check --all`][cargo/3731]
5416 * [Add an option to ignore SSL revocation checking][cargo/3699]
5417 * [Add `cargo run --package`][cargo/3691]
5418 * [Add `required_features`][cargo/3667]
5419 * [Assume `build.rs` is a build script][cargo/3664]
5420 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5425 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5427 * [The "Unstable Book" documents nightly-only features][ubook]
5428 * [Improve the style of the sidebar in rustdoc output][40265]
5429 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5430 * [Fix MSP430 breakage due to `i128`][40257]
5431 * [Preliminary Solaris/SPARCv9 support][39903]
5432 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5433 run without installing the MSVC runtime.
5434 * [`rustdoc --test` includes file names in test names][39788]
5435 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5436 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5437 * [Initial support for `aarch64-unknown-freebsd`][39491]
5438 * [Initial support for `i686-unknown-netbsd`][39426]
5439 * [This release no longer includes the old makefile build system][39431]. Rust
5440 is built with a custom build system, written in Rust, and with Cargo.
5441 * [Add Debug implementations for libcollection structs][39002]
5442 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5443 * [`--test-threads=0` produces an error][38945]
5444 * [`rustup` installs documentation by default][40526]
5445 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5446 WinDbg and Visual Studio to improve the debugging experience.
5451 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5452 workaround, either use MSVC 2015 or run vcvars.bat.
5453 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5454 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5455 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5457 * [`format!` and `Display::to_string` panic if an underlying formatting
5458 implementation returns an error][40117]. Previously the error was silently
5459 ignored. It is incorrect for `write_fmt` to return an error when writing
5461 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5462 crates were marked stable and could be accessed from the stable toolchain.
5463 * [Rust git source no longer includes vendored crates][39728]. Those that need
5464 to build with vendored crates should build from release tarballs.
5465 * [Fix inert attributes from `proc_macro_derives`][39572]
5466 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5467 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5469 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5470 existing code generally ignores the type of dead-code unless a type-hint is
5471 provided; this can cause surprising inference interactions particularly around
5472 defaulting. The new code uniformly ignores the result type of dead-code.
5473 * [Tuple-struct constructors with private fields are no longer visible][38932]
5474 * [Lifetime parameters that do not appear in the arguments are now considered
5475 early-bound][38897], resolving a soundness bug (#[32330]). The
5476 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5478 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5479 * [Make transmuting from fn item types to pointer-sized types a hard
5482 [27787]: https://github.com/rust-lang/rust/issues/27787
5483 [32330]: https://github.com/rust-lang/rust/issues/32330
5484 [34198]: https://github.com/rust-lang/rust/pull/34198
5485 [38161]: https://github.com/rust-lang/rust/pull/38161
5486 [38368]: https://github.com/rust-lang/rust/pull/38368
5487 [38584]: https://github.com/rust-lang/rust/issues/38584
5488 [38661]: https://github.com/rust-lang/rust/pull/38661
5489 [38764]: https://github.com/rust-lang/rust/pull/38764
5490 [38864]: https://github.com/rust-lang/rust/issues/38864
5491 [38897]: https://github.com/rust-lang/rust/pull/38897
5492 [38921]: https://github.com/rust-lang/rust/pull/38921
5493 [38932]: https://github.com/rust-lang/rust/pull/38932
5494 [38945]: https://github.com/rust-lang/rust/pull/38945
5495 [38981]: https://github.com/rust-lang/rust/pull/38981
5496 [39002]: https://github.com/rust-lang/rust/pull/39002
5497 [39116]: https://github.com/rust-lang/rust/pull/39116
5498 [39193]: https://github.com/rust-lang/rust/pull/39193
5499 [39265]: https://github.com/rust-lang/rust/pull/39265
5500 [39356]: https://github.com/rust-lang/rust/pull/39356
5501 [39372]: https://github.com/rust-lang/rust/pull/39372
5502 [39426]: https://github.com/rust-lang/rust/pull/39426
5503 [39431]: https://github.com/rust-lang/rust/pull/39431
5504 [39438]: https://github.com/rust-lang/rust/pull/39438
5505 [39440]: https://github.com/rust-lang/rust/pull/39440
5506 [39485]: https://github.com/rust-lang/rust/pull/39485
5507 [39491]: https://github.com/rust-lang/rust/pull/39491
5508 [39518]: https://github.com/rust-lang/rust/pull/39518
5509 [39538]: https://github.com/rust-lang/rust/pull/39538
5510 [39572]: https://github.com/rust-lang/rust/pull/39572
5511 [39633]: https://github.com/rust-lang/rust/pull/39633
5512 [39642]: https://github.com/rust-lang/rust/pull/39642
5513 [39728]: https://github.com/rust-lang/rust/pull/39728
5514 [39761]: https://github.com/rust-lang/rust/pull/39761
5515 [39788]: https://github.com/rust-lang/rust/pull/39788
5516 [39793]: https://github.com/rust-lang/rust/pull/39793
5517 [39837]: https://github.com/rust-lang/rust/pull/39837
5518 [39843]: https://github.com/rust-lang/rust/pull/39843
5519 [39851]: https://github.com/rust-lang/rust/pull/39851
5520 [39903]: https://github.com/rust-lang/rust/pull/39903
5521 [39939]: https://github.com/rust-lang/rust/pull/39939
5522 [39953]: https://github.com/rust-lang/rust/pull/39953
5523 [39960]: https://github.com/rust-lang/rust/pull/39960
5524 [39990]: https://github.com/rust-lang/rust/pull/39990
5525 [39995]: https://github.com/rust-lang/rust/pull/39995
5526 [40008]: https://github.com/rust-lang/rust/pull/40008
5527 [40009]: https://github.com/rust-lang/rust/pull/40009
5528 [40027]: https://github.com/rust-lang/rust/pull/40027
5529 [40028]: https://github.com/rust-lang/rust/pull/40028
5530 [40037]: https://github.com/rust-lang/rust/pull/40037
5531 [40117]: https://github.com/rust-lang/rust/pull/40117
5532 [40166]: https://github.com/rust-lang/rust/pull/40166
5533 [40245]: https://github.com/rust-lang/rust/pull/40245
5534 [40257]: https://github.com/rust-lang/rust/pull/40257
5535 [40261]: https://github.com/rust-lang/rust/pull/40261
5536 [40265]: https://github.com/rust-lang/rust/pull/40265
5537 [40319]: https://github.com/rust-lang/rust/pull/40319
5538 [40336]: https://github.com/rust-lang/rust/pull/40336
5539 [40526]: https://github.com/rust-lang/rust/pull/40526
5540 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5541 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5542 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5543 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5544 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5545 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5546 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5547 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5548 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5549 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5550 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5551 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5552 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5553 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5554 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5555 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5556 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5557 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5558 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5559 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5560 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5561 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5562 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5563 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5564 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5565 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5566 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5567 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5568 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5569 [mdbook]: https://crates.io/crates/mdbook
5570 [ubook]: https://doc.rust-lang.org/unstable-book/
5573 Version 1.16.0 (2017-03-16)
5574 ===========================
5579 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5580 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5581 match patterns][38069]
5582 * [Clean up semantics of `self` in an import list][38313]
5583 * [`Self` may appear in `impl` headers][38920]
5584 * [`Self` may appear in struct expressions][39282]
5589 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5590 a `.rmeta` file containing only crate metadata][38571]. This can be
5591 used by tools like the Rust Language Service to perform
5592 metadata-only builds.
5593 * [Levenshtein based typo suggestions now work in most places, while
5594 previously they worked only for fields and sometimes for local
5595 variables][38927]. Together with the overhaul of "no
5596 resolution"/"unexpected resolution" errors (#[38154]) they result in
5597 large and systematic improvement in resolution diagnostics.
5598 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5600 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5601 * [`rustc` no longer attempts to provide "consider using an explicit
5602 lifetime" suggestions][37057]. They were inaccurate.
5607 * [`VecDeque::truncate`]
5608 * [`VecDeque::resize`]
5609 * [`String::insert_str`]
5610 * [`Duration::checked_add`]
5611 * [`Duration::checked_sub`]
5612 * [`Duration::checked_div`]
5613 * [`Duration::checked_mul`]
5616 * [`SocketAddr::is_ipv4`]
5617 * [`SocketAddr::is_ipv6`]
5618 * [`IpAddr::is_ipv4`]
5619 * [`IpAddr::is_ipv6`]
5621 * [`Vec::dedup_by_key`]
5622 * [`Result::unwrap_or_default`]
5623 * [`<*const T>::wrapping_offset`]
5624 * [`<*mut T>::wrapping_offset`]
5625 * `CommandExt::creation_flags`
5626 * [`File::set_permissions`]
5627 * [`String::split_off`]
5632 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5633 their argument by `Borrow` parameter][37761]
5634 * [All public types in std implement `Debug`][38006]
5635 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5636 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5637 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5639 * [std: Fix partial writes in `LineWriter`][38062]
5640 * [std: Clamp max read/write sizes on Unix][38062]
5641 * [Use more specific panic message for `&str` slicing errors][38066]
5642 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5643 functionality cannot be achieved in std currently.
5644 * [`writeln!`, like `println!`, now accepts a form with no string
5645 or formatting arguments, to just print a newline][38469]
5646 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5647 * [Reduce the size of static data in `std_unicode::tables`][38781]
5648 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5649 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5651 * [`Duration` implements `Sum`][38712]
5652 * [`String` implements `ToSocketAddrs`][39048]
5657 * [The `cargo check` command does a type check of a project without
5658 building it][cargo/3296]
5659 * [crates.io will display CI badges from Travis and AppVeyor, if
5660 specified in Cargo.toml][cargo/3546]
5661 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5662 * [Compilation profiles accept integer values for `debug`, in addition
5663 to `true` and `false`. These are passed to `rustc` as the value to
5664 `-C debuginfo`][cargo/3534]
5665 * [Implement `cargo --version --verbose`][cargo/3604]
5666 * [All builds now output 'dep-info' build dependencies compatible with
5667 make and ninja][cargo/3557]
5668 * [Build all workspace members with `build --all`][cargo/3511]
5669 * [Document all workspace members with `doc --all`][cargo/3515]
5670 * [Path deps outside workspace are not members][cargo/3443]
5675 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5676 the path to the Rust implementation][38589]
5677 * [The `armv7-linux-androideabi` target no longer enables NEON
5678 extensions, per Google's ABI guide][38413]
5679 * [The stock standard library can be compiled for Redox OS][38401]
5680 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5682 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5684 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5689 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5690 match patterns][38069]
5691 * In this release, references to uninhabited types can not be
5692 pattern-matched. This was accidentally allowed in 1.15.
5693 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5694 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5696 * [Clean up semantics of `self` in an import list][38313]
5697 * Reimplemented lifetime elision. This change was almost entirely compatible
5698 with existing code, but it did close a number of small bugs and loopholes,
5699 as well as being more accepting in some other [cases][41105].
5701 [37057]: https://github.com/rust-lang/rust/pull/37057
5702 [37761]: https://github.com/rust-lang/rust/pull/37761
5703 [38006]: https://github.com/rust-lang/rust/pull/38006
5704 [38051]: https://github.com/rust-lang/rust/pull/38051
5705 [38062]: https://github.com/rust-lang/rust/pull/38062
5706 [38062]: https://github.com/rust-lang/rust/pull/38622
5707 [38066]: https://github.com/rust-lang/rust/pull/38066
5708 [38069]: https://github.com/rust-lang/rust/pull/38069
5709 [38131]: https://github.com/rust-lang/rust/pull/38131
5710 [38154]: https://github.com/rust-lang/rust/pull/38154
5711 [38274]: https://github.com/rust-lang/rust/pull/38274
5712 [38304]: https://github.com/rust-lang/rust/pull/38304
5713 [38313]: https://github.com/rust-lang/rust/pull/38313
5714 [38314]: https://github.com/rust-lang/rust/pull/38314
5715 [38327]: https://github.com/rust-lang/rust/pull/38327
5716 [38401]: https://github.com/rust-lang/rust/pull/38401
5717 [38413]: https://github.com/rust-lang/rust/pull/38413
5718 [38469]: https://github.com/rust-lang/rust/pull/38469
5719 [38559]: https://github.com/rust-lang/rust/pull/38559
5720 [38571]: https://github.com/rust-lang/rust/pull/38571
5721 [38580]: https://github.com/rust-lang/rust/pull/38580
5722 [38589]: https://github.com/rust-lang/rust/pull/38589
5723 [38670]: https://github.com/rust-lang/rust/pull/38670
5724 [38712]: https://github.com/rust-lang/rust/pull/38712
5725 [38726]: https://github.com/rust-lang/rust/pull/38726
5726 [38781]: https://github.com/rust-lang/rust/pull/38781
5727 [38798]: https://github.com/rust-lang/rust/pull/38798
5728 [38909]: https://github.com/rust-lang/rust/pull/38909
5729 [38920]: https://github.com/rust-lang/rust/pull/38920
5730 [38927]: https://github.com/rust-lang/rust/pull/38927
5731 [39048]: https://github.com/rust-lang/rust/pull/39048
5732 [39282]: https://github.com/rust-lang/rust/pull/39282
5733 [39379]: https://github.com/rust-lang/rust/pull/39379
5734 [41105]: https://github.com/rust-lang/rust/issues/41105
5735 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5736 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5737 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5738 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5739 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5740 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5741 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5742 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5743 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5744 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5745 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5746 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5747 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5748 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5749 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5750 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5751 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5752 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5753 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5754 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5755 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5756 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5757 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5758 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5759 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5760 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5761 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5762 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5763 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5764 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5767 Version 1.15.1 (2017-02-09)
5768 ===========================
5770 * [Fix IntoIter::as_mut_slice's signature][39466]
5771 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5773 [39466]: https://github.com/rust-lang/rust/pull/39466
5774 [39523]: https://github.com/rust-lang/rust/pull/39523
5777 Version 1.15.0 (2017-02-02)
5778 ===========================
5783 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5784 stable. This allows popular code-generating crates like Serde and Diesel to
5785 work ergonomically. [RFC 1681].
5786 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5787 with curly braces][36868]. Part of [RFC 1506].
5788 * [A number of minor changes to name resolution have been activated][37127].
5789 They add up to more consistent semantics, allowing for future evolution of
5790 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5791 details of what is different. The breaking changes here have been transitioned
5792 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5793 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5795 * [`?Sized` can be used in `where` clauses][37791]
5796 * [There is now a limit on the size of monomorphized types and it can be
5797 modified with the `#![type_size_limit]` crate attribute, similarly to
5798 the `#![recursion_limit]` attribute][37789]
5803 * [On Windows, the compiler will apply dllimport attributes when linking to
5804 extern functions][37973]. Additional attributes and flags can control which
5805 library kind is linked and its name. [RFC 1717].
5806 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5807 * [The `--test` flag works with procedural macro crates][38107]
5808 * [Fix `extern "aapcs" fn` ABI][37814]
5809 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5810 * [The `format!` expander recognizes incorrect `printf` and shell-style
5811 formatting directives and suggests the correct format][37613].
5812 * [Only report one error for all unused imports in an import list][37456]
5814 Compiler Performance
5815 --------------------
5817 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5818 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5819 * [Don't clone in `UnificationTable::probe`][37848]
5820 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5821 * [Use small vectors in type walker][37760]
5822 * [Macro expansion performance was improved][37701]
5823 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5824 * [Replace FNV with a faster hash function][37229]
5829 * [`std::iter::Iterator::min_by`]
5830 * [`std::iter::Iterator::max_by`]
5831 * [`std::os::*::fs::FileExt`]
5832 * [`std::sync::atomic::Atomic*::get_mut`]
5833 * [`std::sync::atomic::Atomic*::into_inner`]
5834 * [`std::vec::IntoIter::as_slice`]
5835 * [`std::vec::IntoIter::as_mut_slice`]
5836 * [`std::sync::mpsc::Receiver::try_iter`]
5837 * [`std::os::unix::process::CommandExt::before_exec`]
5838 * [`std::rc::Rc::strong_count`]
5839 * [`std::rc::Rc::weak_count`]
5840 * [`std::sync::Arc::strong_count`]
5841 * [`std::sync::Arc::weak_count`]
5842 * [`std::char::encode_utf8`]
5843 * [`std::char::encode_utf16`]
5844 * [`std::cell::Ref::clone`]
5845 * [`std::io::Take::into_inner`]
5850 * [The standard sorting algorithm has been rewritten for dramatic performance
5851 improvements][38192]. It is a hybrid merge sort, drawing influences from
5852 Timsort. Previously it was a naive merge sort.
5853 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5854 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5856 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5857 and `char_indices().last()`][37882]
5858 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5859 * [Chinese characters display correctly in `fmt::Debug`][37855]
5860 * [Derive `Default` for `Duration`][37699]
5861 * [Support creation of anonymous pipes on WinXP/2k][37677]
5862 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5863 * [Don't pass overlapped handles to processes][38835]
5868 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5869 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5870 should instead check the variable at runtime with `std::env`. That the value
5871 was set at build time was a bug, and incorrect when cross-compiling. This
5872 change is known to cause breakage.
5873 * [Add `--all` flag to `cargo test`][cargo/3221]
5874 * [Compile statically against the MSVC CRT][cargo/3363]
5875 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5876 * [Link OpenSSL statically on OSX][cargo/3311]
5877 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5878 * [Test for bad path overrides with summaries][cargo/3336]
5879 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5880 * [Fix retrying crate downloads for network errors][cargo/3348]
5881 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5882 * [Emit more info on --message-format=json][cargo/3319]
5883 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5884 * [Don't ignore errors in workspace manifest][cargo/3409]
5885 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5890 * [Test runners (binaries built with `--test`) now support a `--list` argument
5891 that lists the tests it contains][38185]
5892 * [Test runners now support a `--exact` argument that makes the test filter
5893 match exactly, instead of matching only a substring of the test name][38181]
5894 * [rustdoc supports a `--playground-url` flag][37763]
5895 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5900 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5901 continue to be used in this release by passing `--disable-rustbuild` to the
5902 configure script, but they will be deleted soon. Note that the new build
5903 system uses a different on-disk layout that will likely affect any scripts
5905 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5907 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5908 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5914 * [A number of minor changes to name resolution have been activated][37127].
5915 They add up to more consistent semantics, allowing for future evolution of
5916 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5917 details of what is different. The breaking changes here have been transitioned
5918 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5919 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5920 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5921 should instead check the variable at runtime with `std::env`. That the value
5922 was set at build time was a bug, and incorrect when cross-compiling. This
5923 change is known to cause breakage.
5924 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5925 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5926 1.10 and is now an error by default. It will become a hard error in the near
5928 * [The semantics relating modules to file system directories are changing in
5929 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5930 lint, which is a warning in this release, and will become a hard error in the
5932 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5933 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5934 the underlying iterator][37834]
5936 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5937 [33685]: https://github.com/rust-lang/rust/issues/33685
5938 [36868]: https://github.com/rust-lang/rust/pull/36868
5939 [37127]: https://github.com/rust-lang/rust/pull/37127
5940 [37229]: https://github.com/rust-lang/rust/pull/37229
5941 [37456]: https://github.com/rust-lang/rust/pull/37456
5942 [37527]: https://github.com/rust-lang/rust/pull/37527
5943 [37602]: https://github.com/rust-lang/rust/pull/37602
5944 [37613]: https://github.com/rust-lang/rust/pull/37613
5945 [37615]: https://github.com/rust-lang/rust/pull/37615
5946 [37636]: https://github.com/rust-lang/rust/pull/37636
5947 [37627]: https://github.com/rust-lang/rust/pull/37627
5948 [37642]: https://github.com/rust-lang/rust/pull/37642
5949 [37677]: https://github.com/rust-lang/rust/pull/37677
5950 [37699]: https://github.com/rust-lang/rust/pull/37699
5951 [37701]: https://github.com/rust-lang/rust/pull/37701
5952 [37705]: https://github.com/rust-lang/rust/pull/37705
5953 [37749]: https://github.com/rust-lang/rust/pull/37749
5954 [37760]: https://github.com/rust-lang/rust/pull/37760
5955 [37763]: https://github.com/rust-lang/rust/pull/37763
5956 [37764]: https://github.com/rust-lang/rust/pull/37764
5957 [37789]: https://github.com/rust-lang/rust/pull/37789
5958 [37791]: https://github.com/rust-lang/rust/pull/37791
5959 [37814]: https://github.com/rust-lang/rust/pull/37814
5960 [37817]: https://github.com/rust-lang/rust/pull/37817
5961 [37834]: https://github.com/rust-lang/rust/pull/37834
5962 [37848]: https://github.com/rust-lang/rust/pull/37848
5963 [37855]: https://github.com/rust-lang/rust/pull/37855
5964 [37882]: https://github.com/rust-lang/rust/pull/37882
5965 [37888]: https://github.com/rust-lang/rust/pull/37888
5966 [37973]: https://github.com/rust-lang/rust/pull/37973
5967 [37979]: https://github.com/rust-lang/rust/pull/37979
5968 [38086]: https://github.com/rust-lang/rust/pull/38086
5969 [38107]: https://github.com/rust-lang/rust/pull/38107
5970 [38117]: https://github.com/rust-lang/rust/pull/38117
5971 [38134]: https://github.com/rust-lang/rust/pull/38134
5972 [38146]: https://github.com/rust-lang/rust/pull/38146
5973 [38181]: https://github.com/rust-lang/rust/pull/38181
5974 [38182]: https://github.com/rust-lang/rust/pull/38182
5975 [38185]: https://github.com/rust-lang/rust/pull/38185
5976 [38192]: https://github.com/rust-lang/rust/pull/38192
5977 [38279]: https://github.com/rust-lang/rust/pull/38279
5978 [38835]: https://github.com/rust-lang/rust/pull/38835
5979 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5980 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5981 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5982 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5983 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5984 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5985 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5986 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5987 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5988 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5989 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5990 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5991 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5992 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5993 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5994 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5995 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5996 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5997 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5998 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5999 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6000 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6001 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6002 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6003 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6004 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6005 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6006 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6007 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6008 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6009 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6010 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6011 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6012 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6013 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6014 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6015 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6016 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6019 Version 1.14.0 (2016-12-22)
6020 ===========================
6025 * [`..` matches multiple tuple fields in enum variants, structs
6026 and tuples][36843]. [RFC 1492].
6027 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6028 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6029 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6030 dereferencing][36822]
6035 * [Mark enums with non-zero discriminant as non-zero][37224]
6036 * [Lower-case `static mut` names are linted like other
6037 statics and consts][37162]
6038 * [Fix ICE on some macros in const integer positions
6039 (e.g. `[u8; m!()]`)][36819]
6040 * [Improve error message and snippet for "did you mean `x`"][36798]
6041 * [Add a panic-strategy field to the target specification][36794]
6042 * [Include LLVM version in `--version --verbose`][37200]
6044 Compile-time Optimizations
6045 --------------------------
6047 * [Improve macro expansion performance][37569]
6048 * [Shrink `Expr_::ExprInlineAsm`][37445]
6049 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6050 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6051 * [Avoid more allocations when compiling html5ever][37373]
6052 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6053 * [Avoid some allocations in the macro parser][37318]
6054 * [Use a faster deflate setting][37298]
6055 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6056 during interning of slices][37270]
6057 * [Optimize `write_metadata`][37267]
6058 * [Don't process obligation forest cycles when stalled][37231]
6059 * [Avoid many `CrateConfig` clones][37161]
6060 * [Optimize `Substs::super_fold_with`][37108]
6061 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6062 * [Speed up `plug_leaks`][36917]
6067 * [`println!()`, with no arguments, prints newline][36825].
6068 Previously, an empty string was required to achieve the same.
6069 * [`Wrapping` impls standard binary and unary operators, as well as
6070 the `Sum` and `Product` iterators][37356]
6071 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6073 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6074 `VecDeque` iterators][37315]
6075 * [Improve `SipHasher` performance on small values][37312]
6076 * [Add Iterator trait TrustedLen to enable better FromIterator /
6078 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6079 * [`ReadDir` implements `Debug`][37221]
6080 * [Implement `RefUnwindSafe` for atomic types][37178]
6081 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6082 * [Avoid allocations in `Decoder::read_str`][37064]
6083 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6084 * [Impl `Debug` for raw pointers to unsized data][36880]
6085 * [Don't reuse `HashMap` random seeds][37470]
6086 * [The internal memory layout of `HashMap` is more cache-friendly, for
6087 significant improvements in some operations][36692]
6088 * [`HashMap` uses less memory on 32-bit architectures][36595]
6089 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6094 * [Expose rustc cfg values to build scripts][cargo/3243]
6095 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6096 * [Fix passing --features when testing multiple packages][cargo/3280]
6097 * [Use a single profile set per workspace][cargo/3249]
6098 * [Load `replace` sections from lock files][cargo/3220]
6099 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6104 * [rustup is the recommended Rust installation method][1.14rustup]
6105 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6106 S390x. These are [tier 2] platforms and may have major defects. Follow the
6107 instructions on the website to install, or add the targets to an existing
6108 installation with `rustup target add`. The new target triples are:
6109 - `mips-unknown-linux-gnu`
6110 - `mipsel-unknown-linux-gnu`
6111 - `mips64-unknown-linux-gnuabi64`
6112 - `mips64el-unknown-linux-gnuabi64 `
6113 - `powerpc-unknown-linux-gnu`
6114 - `powerpc64-unknown-linux-gnu`
6115 - `powerpc64le-unknown-linux-gnu`
6116 - `s390x-unknown-linux-gnu `
6117 * This release includes target (std) builds for ARM Linux running MUSL
6118 libc. These are [tier 2] platforms and may have major defects. Add the
6119 following triples to an existing rustup installation with `rustup target add`:
6120 - `arm-unknown-linux-musleabi`
6121 - `arm-unknown-linux-musleabihf`
6122 - `armv7-unknown-linux-musleabihf`
6123 * This release includes [experimental support for WebAssembly][1.14wasm], via
6124 the `wasm32-unknown-emscripten` target. This target is known to have major
6125 defects. Please test, report, and fix.
6126 * rustup no longer installs documentation by default. Run `rustup
6127 component add rust-docs` to install.
6128 * [Fix line stepping in debugger][37310]
6129 * [Enable line number debuginfo in releases][37280]
6134 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6135 * [Add support for Fuchsia OS][37313]
6136 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6141 * [A number of forward-compatibility lints used by the compiler
6142 to gradually introduce language changes have been converted
6143 to deny by default][36894]:
6144 - ["use of inaccessible extern crate erroneously allowed"][36886]
6145 - ["type parameter default erroneously allowed in invalid location"][36887]
6146 - ["detects super or self keywords at the beginning of global path"][36888]
6147 - ["two overlapping inherent impls define an item with the same name
6148 were erroneously allowed"][36889]
6149 - ["floating-point constants cannot be used in patterns"][36890]
6150 - ["constants of struct or enum type can only be used in a pattern if
6151 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6152 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6153 * [Prohibit patterns in trait methods without bodies][37378]
6154 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6155 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6156 * [The `$crate` macro variable is accepted in fewer locations][37213]
6157 * [Impls specifying extra region requirements beyond the trait
6158 they implement are rejected][37167]
6159 * [Enums may not be unsized][37111]. Unsized enums are intended to
6160 work but never have. For now they are forbidden.
6161 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6163 [tier 2]: https://forge.rust-lang.org/platform-support.html
6164 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6165 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6166 [36430]: https://github.com/rust-lang/rust/pull/36430
6167 [36595]: https://github.com/rust-lang/rust/pull/36595
6168 [36595]: https://github.com/rust-lang/rust/pull/36595
6169 [36692]: https://github.com/rust-lang/rust/pull/36692
6170 [36767]: https://github.com/rust-lang/rust/pull/36767
6171 [36794]: https://github.com/rust-lang/rust/pull/36794
6172 [36798]: https://github.com/rust-lang/rust/pull/36798
6173 [36819]: https://github.com/rust-lang/rust/pull/36819
6174 [36822]: https://github.com/rust-lang/rust/pull/36822
6175 [36825]: https://github.com/rust-lang/rust/pull/36825
6176 [36843]: https://github.com/rust-lang/rust/pull/36843
6177 [36880]: https://github.com/rust-lang/rust/pull/36880
6178 [36886]: https://github.com/rust-lang/rust/issues/36886
6179 [36887]: https://github.com/rust-lang/rust/issues/36887
6180 [36888]: https://github.com/rust-lang/rust/issues/36888
6181 [36889]: https://github.com/rust-lang/rust/issues/36889
6182 [36890]: https://github.com/rust-lang/rust/issues/36890
6183 [36891]: https://github.com/rust-lang/rust/issues/36891
6184 [36892]: https://github.com/rust-lang/rust/issues/36892
6185 [36894]: https://github.com/rust-lang/rust/pull/36894
6186 [36917]: https://github.com/rust-lang/rust/pull/36917
6187 [36993]: https://github.com/rust-lang/rust/pull/36993
6188 [37037]: https://github.com/rust-lang/rust/pull/37037
6189 [37064]: https://github.com/rust-lang/rust/pull/37064
6190 [37094]: https://github.com/rust-lang/rust/pull/37094
6191 [37108]: https://github.com/rust-lang/rust/pull/37108
6192 [37111]: https://github.com/rust-lang/rust/pull/37111
6193 [37161]: https://github.com/rust-lang/rust/pull/37161
6194 [37162]: https://github.com/rust-lang/rust/pull/37162
6195 [37167]: https://github.com/rust-lang/rust/pull/37167
6196 [37178]: https://github.com/rust-lang/rust/pull/37178
6197 [37200]: https://github.com/rust-lang/rust/pull/37200
6198 [37213]: https://github.com/rust-lang/rust/pull/37213
6199 [37221]: https://github.com/rust-lang/rust/pull/37221
6200 [37224]: https://github.com/rust-lang/rust/pull/37224
6201 [37230]: https://github.com/rust-lang/rust/pull/37230
6202 [37231]: https://github.com/rust-lang/rust/pull/37231
6203 [37247]: https://github.com/rust-lang/rust/pull/37247
6204 [37267]: https://github.com/rust-lang/rust/pull/37267
6205 [37270]: https://github.com/rust-lang/rust/pull/37270
6206 [37273]: https://github.com/rust-lang/rust/pull/37273
6207 [37280]: https://github.com/rust-lang/rust/pull/37280
6208 [37298]: https://github.com/rust-lang/rust/pull/37298
6209 [37306]: https://github.com/rust-lang/rust/pull/37306
6210 [37310]: https://github.com/rust-lang/rust/pull/37310
6211 [37312]: https://github.com/rust-lang/rust/pull/37312
6212 [37313]: https://github.com/rust-lang/rust/pull/37313
6213 [37315]: https://github.com/rust-lang/rust/pull/37315
6214 [37318]: https://github.com/rust-lang/rust/pull/37318
6215 [37322]: https://github.com/rust-lang/rust/pull/37322
6216 [37326]: https://github.com/rust-lang/rust/pull/37326
6217 [37351]: https://github.com/rust-lang/rust/pull/37351
6218 [37356]: https://github.com/rust-lang/rust/pull/37356
6219 [37367]: https://github.com/rust-lang/rust/pull/37367
6220 [37373]: https://github.com/rust-lang/rust/pull/37373
6221 [37378]: https://github.com/rust-lang/rust/pull/37378
6222 [37389]: https://github.com/rust-lang/rust/pull/37389
6223 [37392]: https://github.com/rust-lang/rust/pull/37392
6224 [37427]: https://github.com/rust-lang/rust/pull/37427
6225 [37439]: https://github.com/rust-lang/rust/pull/37439
6226 [37445]: https://github.com/rust-lang/rust/pull/37445
6227 [37470]: https://github.com/rust-lang/rust/pull/37470
6228 [37569]: https://github.com/rust-lang/rust/pull/37569
6229 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6230 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6231 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6232 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6233 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6234 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6235 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6238 Version 1.13.0 (2016-11-10)
6239 ===========================
6244 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6245 errors, like the `try!` macro, described in [RFC 0243].
6246 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6247 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6248 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6249 * [Fix lifetime rules for 'if' conditions][36029]
6250 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6255 * [Add the `-C link-arg` argument][36574]
6256 * [Remove the old AST-based backend from rustc_trans][35764]
6257 * [Don't enable NEON by default on armv7 Linux][35814]
6258 * [Fix debug line number info for macro expansions][35238]
6259 * [Do not emit "class method" debuginfo for types that are not
6260 DICompositeType][36008]
6261 * [Warn about multiple conflicting #[repr] hints][34623]
6262 * [When sizing DST, don't double-count nested struct prefixes][36351]
6263 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6264 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6265 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6266 * [Expand macros without recursing to avoid stack overflows][36214]
6271 * [Replace macro backtraces with labeled local uses][35702]
6272 * [Improve error message for misplaced doc comments][33922]
6273 * [Buffer unix and lock windows to prevent message interleaving][35975]
6274 * [Update lifetime errors to specifically note temporaries][36171]
6275 * [Special case a few colors for Windows][36178]
6276 * [Suggest `use self` when such an import resolves][36289]
6277 * [Be more specific when type parameter shadows primitive type][36338]
6278 * Many minor improvements
6280 Compile-time Optimizations
6281 --------------------------
6283 * [Compute and cache HIR hashes at beginning][35854]
6284 * [Don't hash types in loan paths][36004]
6285 * [Cache projections in trans][35761]
6286 * [Optimize the parser's last token handling][36527]
6287 * [Only instantiate #[inline] functions in codegen units referencing
6288 them][36524]. This leads to big improvements in cases where crates export
6289 define many inline functions without using them directly.
6290 * [Lazily allocate TypedArena's first chunk][36592]
6291 * [Don't allocate during default HashSet creation][36734]
6298 * [`overflowing_abs`]
6299 * [`RefCell::try_borrow`]
6300 * [`RefCell::try_borrow_mut`]
6305 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6306 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6308 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6309 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6310 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6311 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6312 * [Use arc4rand on FreeBSD][35884]
6313 * [memrchr: Correct aligned offset computation][35969]
6314 * [Improve Demangling of Rust Symbols][36059]
6315 * [Use monotonic time in condition variables][35048]
6316 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6317 * [Implement conversion traits for `char`][35755]
6318 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6319 * [Zero first byte of CString on drop][36264]
6320 * [Inherit overflow checks for sum and product][36372]
6321 * [Add missing Eq implementations][36423]
6322 * [Implement `Debug` for `DirEntry`][36631]
6323 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6325 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6326 * [Implement more traits for `std::io::ErrorKind`][35911]
6327 * [Optimize BinaryHeap bounds checking][36072]
6328 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6329 `extend_with_element`][36355]
6330 * [Fix overflow checking in unsigned pow()][34942]
6335 * This release includes security fixes to both curl and OpenSSL.
6336 * [Fix transitive doctests when panic=abort][cargo/3021]
6337 * [Add --all-features flag to cargo][cargo/3038]
6338 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6339 * [Don't parse the home directory more than once][cargo/3078]
6340 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6341 * [Update OpenSSL to 1.0.2j][cargo/3121]
6342 * [Add license and license_file to cargo metadata output][cargo/3110]
6343 * [Make crates-io registry URL optional in config; ignore all changes to
6344 source.crates-io][cargo/3089]
6345 * [Don't download dependencies from other platforms][cargo/3123]
6346 * [Build transitive dev-dependencies when needed][cargo/3125]
6347 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6348 * [Avoid updating registry when adding existing deps][cargo/3144]
6349 * [Warn about path overrides that won't work][cargo/3136]
6350 * [Use workspaces during `cargo install`][cargo/3146]
6351 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6352 * [Add --message-format flag][cargo/3000]
6353 * [Pass target environment for rustdoc][cargo/3205]
6354 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6355 * [Update curl and curl-sys][cargo/3241]
6356 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6361 * [rustdoc: Add the `--sysroot` argument][36586]
6362 * [rustdoc: Fix a couple of issues with the search results][35655]
6363 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6364 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6365 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6370 * [Remove unmaintained style guide][35124]
6371 * [Add s390x support][36369]
6372 * [Initial work at Haiku OS support][36727]
6373 * [Add mips-uclibc targets][35734]
6374 * [Crate-ify compiler-rt into compiler-builtins][35021]
6375 * [Add rustc version info (git hash + date) to dist tarball][36213]
6376 * Many documentation improvements
6381 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6382 * [Deny (by default) transmuting from fn item types to pointer-sized
6383 types][34923]. Continuing the long transition to zero-sized fn items,
6385 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6387 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6388 * [Fix lifetime rules for 'if' conditions][36029].
6389 * [Inherit overflow checks for sum and product][36372].
6390 * [Forbid user-defined macros named "macro_rules"][36730].
6392 [33922]: https://github.com/rust-lang/rust/pull/33922
6393 [34623]: https://github.com/rust-lang/rust/pull/34623
6394 [34923]: https://github.com/rust-lang/rust/pull/34923
6395 [34942]: https://github.com/rust-lang/rust/pull/34942
6396 [34982]: https://github.com/rust-lang/rust/pull/34982
6397 [35021]: https://github.com/rust-lang/rust/pull/35021
6398 [35048]: https://github.com/rust-lang/rust/pull/35048
6399 [35074]: https://github.com/rust-lang/rust/pull/35074
6400 [35124]: https://github.com/rust-lang/rust/pull/35124
6401 [35234]: https://github.com/rust-lang/rust/pull/35234
6402 [35238]: https://github.com/rust-lang/rust/pull/35238
6403 [35354]: https://github.com/rust-lang/rust/pull/35354
6404 [35559]: https://github.com/rust-lang/rust/pull/35559
6405 [35585]: https://github.com/rust-lang/rust/pull/35585
6406 [35627]: https://github.com/rust-lang/rust/pull/35627
6407 [35655]: https://github.com/rust-lang/rust/pull/35655
6408 [35702]: https://github.com/rust-lang/rust/pull/35702
6409 [35707]: https://github.com/rust-lang/rust/pull/35707
6410 [35728]: https://github.com/rust-lang/rust/pull/35728
6411 [35734]: https://github.com/rust-lang/rust/pull/35734
6412 [35755]: https://github.com/rust-lang/rust/pull/35755
6413 [35761]: https://github.com/rust-lang/rust/pull/35761
6414 [35764]: https://github.com/rust-lang/rust/pull/35764
6415 [35814]: https://github.com/rust-lang/rust/pull/35814
6416 [35854]: https://github.com/rust-lang/rust/pull/35854
6417 [35871]: https://github.com/rust-lang/rust/pull/35871
6418 [35884]: https://github.com/rust-lang/rust/pull/35884
6419 [35911]: https://github.com/rust-lang/rust/pull/35911
6420 [35969]: https://github.com/rust-lang/rust/pull/35969
6421 [35975]: https://github.com/rust-lang/rust/pull/35975
6422 [36004]: https://github.com/rust-lang/rust/pull/36004
6423 [36008]: https://github.com/rust-lang/rust/pull/36008
6424 [36014]: https://github.com/rust-lang/rust/pull/36014
6425 [36029]: https://github.com/rust-lang/rust/pull/36029
6426 [36059]: https://github.com/rust-lang/rust/pull/36059
6427 [36072]: https://github.com/rust-lang/rust/pull/36072
6428 [36101]: https://github.com/rust-lang/rust/pull/36101
6429 [36104]: https://github.com/rust-lang/rust/pull/36104
6430 [36171]: https://github.com/rust-lang/rust/pull/36171
6431 [36173]: https://github.com/rust-lang/rust/pull/36173
6432 [36178]: https://github.com/rust-lang/rust/pull/36178
6433 [36213]: https://github.com/rust-lang/rust/pull/36213
6434 [36214]: https://github.com/rust-lang/rust/pull/36214
6435 [36264]: https://github.com/rust-lang/rust/pull/36264
6436 [36266]: https://github.com/rust-lang/rust/pull/36266
6437 [36289]: https://github.com/rust-lang/rust/pull/36289
6438 [36338]: https://github.com/rust-lang/rust/pull/36338
6439 [36351]: https://github.com/rust-lang/rust/pull/36351
6440 [36355]: https://github.com/rust-lang/rust/pull/36355
6441 [36369]: https://github.com/rust-lang/rust/pull/36369
6442 [36372]: https://github.com/rust-lang/rust/pull/36372
6443 [36423]: https://github.com/rust-lang/rust/pull/36423
6444 [36482]: https://github.com/rust-lang/rust/pull/36482
6445 [36505]: https://github.com/rust-lang/rust/pull/36505
6446 [36524]: https://github.com/rust-lang/rust/pull/36524
6447 [36527]: https://github.com/rust-lang/rust/pull/36527
6448 [36551]: https://github.com/rust-lang/rust/pull/36551
6449 [36574]: https://github.com/rust-lang/rust/pull/36574
6450 [36586]: https://github.com/rust-lang/rust/pull/36586
6451 [36592]: https://github.com/rust-lang/rust/pull/36592
6452 [36631]: https://github.com/rust-lang/rust/pull/36631
6453 [36639]: https://github.com/rust-lang/rust/pull/36639
6454 [36721]: https://github.com/rust-lang/rust/pull/36721
6455 [36727]: https://github.com/rust-lang/rust/pull/36727
6456 [36730]: https://github.com/rust-lang/rust/pull/36730
6457 [36734]: https://github.com/rust-lang/rust/pull/36734
6458 [36754]: https://github.com/rust-lang/rust/pull/36754
6459 [36995]: https://github.com/rust-lang/rust/pull/36995
6460 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6461 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6462 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6463 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6464 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6465 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6466 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6467 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6468 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6469 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6470 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6471 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6472 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6473 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6474 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6475 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6476 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6477 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6478 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6479 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6480 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6481 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6482 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6483 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6484 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6485 [rustup]: https://www.rustup.rs
6486 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6487 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6488 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6489 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6490 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6491 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6492 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6495 Version 1.12.1 (2016-10-20)
6496 ===========================
6501 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6502 * [Confusion with double negation and booleans][36856]
6503 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6504 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6505 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6506 * [Corrupted memory after updated to 1.12][36936]
6507 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6508 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6509 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6511 [36381]: https://github.com/rust-lang/rust/issues/36381
6512 [36856]: https://github.com/rust-lang/rust/issues/36856
6513 [36875]: https://github.com/rust-lang/rust/issues/36875
6514 [36924]: https://github.com/rust-lang/rust/issues/36924
6515 [36926]: https://github.com/rust-lang/rust/issues/36926
6516 [36936]: https://github.com/rust-lang/rust/issues/36936
6517 [37026]: https://github.com/rust-lang/rust/issues/37026
6518 [37112]: https://github.com/rust-lang/rust/issues/37112
6519 [37153]: https://github.com/rust-lang/rust/issues/37153
6522 Version 1.12.0 (2016-09-29)
6523 ===========================
6528 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6529 This translation pass is far simpler than the previous AST->LLVM pass, and
6530 creates opportunities to perform new optimizations directly on the MIR. It
6531 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6532 * [`rustc` presents a new, more readable error format, along with
6533 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6534 Most common editors supporting Rust have been updated to work with it. It was
6535 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6540 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6541 This translation pass is far simpler than the previous AST->LLVM pass, and
6542 creates opportunities to perform new optimizations directly on the MIR. It
6543 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6544 * [Print the Rust target name, not the LLVM target name, with
6545 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6546 * [The computation of `TypeId` is correct in some cases where it was previously
6547 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6548 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6549 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6550 `--print relocation-models`, and `--print code-models` print the available
6551 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6552 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6553 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6554 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6555 These targets produce statically-linked binaries. There are no binary release
6561 * [`rustc` presents a new, more readable error format, along with
6562 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6563 Most common editors supporting Rust have been updated to work with it. It was
6564 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6565 * [In error descriptions, references are now described in plain English,
6566 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6567 * [In error type descriptions, unknown numeric types are named `{integer}` or
6568 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6569 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6574 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6575 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6576 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6577 useful](https://github.com/rust-lang/rust/pull/34908)
6578 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6579 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6580 * [Semicolons are properly required as statement delimiters inside
6581 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6582 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6587 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6588 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6589 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6590 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6591 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6592 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6593 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6594 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6595 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6596 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6597 Both on Unix and Windows.
6598 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6599 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6600 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6601 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6602 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6603 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6604 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6605 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6610 * [The `format!` macro and friends now allow a single argument to be formatted
6611 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6612 * [The lifetime bounds on `[T]::binary_search_by` and
6613 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6614 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6615 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6616 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6617 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6618 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6619 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6620 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6621 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6622 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6623 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6624 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6625 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6626 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6627 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6628 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6629 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6630 * [`mpsc::sync_channel` `Receiver`s return any available message before
6631 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6632 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6633 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6638 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6639 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6640 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6641 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6642 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6643 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6644 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6645 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6646 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6647 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6648 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6649 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6650 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6651 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6652 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6653 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6658 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6659 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6664 * [Test binaries now support a `--test-threads` argument to specify the number
6665 of threads used to run tests, and which acts the same as the
6666 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6667 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6668 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6669 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6670 * [Rust releases now come with source packages that can be installed by rustup
6671 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6672 The resulting source code can be used by tools and IDES, located in the
6673 sysroot under `lib/rustlib/src`.
6678 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6679 * Many minor improvements to the documentation.
6680 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6685 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6686 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6687 * [When formatting strings, if "precision" is specified, the "fill",
6688 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6689 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6692 Version 1.11.0 (2016-08-18)
6693 ===========================
6698 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6699 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6700 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6701 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6706 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6707 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6708 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6709 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6710 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6711 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6712 (in libcore - previously stabilized in libstd)
6713 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6714 (in libcore - previously stabilized in libstd)
6715 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6716 (in libcore - previously stabilized in libstd)
6717 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6718 (in libcore - previously stabilized in libstd)
6719 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6720 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6721 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6722 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6727 * [The `thread_local!` macro supports multiple definitions in a single
6728 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6729 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6730 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6731 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6732 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6733 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6734 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6735 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6740 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6741 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6742 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6743 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6744 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6745 and `-vv` prints warnings for all crates.
6746 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6747 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6748 This provides room for expansion by arbitrary tools.
6749 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6750 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6751 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6752 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6753 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6754 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6755 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6760 * [Caching projections speeds up type check dramatically for some
6761 workloads](https://github.com/rust-lang/rust/pull/33816)
6762 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6763 This hasher is faster, but is believed to provide sufficient
6764 protection from collision attacks.
6765 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6770 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6771 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6772 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6773 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6774 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6779 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6780 * [When emitting debug info, rustc emits frame pointers for closures,
6781 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6782 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6783 * Many more errors have been given error codes and extended
6785 * API documentation continues to be improved, with many new examples
6790 * [rustc no longer hangs when dependencies recursively re-export
6791 submodules](https://github.com/rust-lang/rust/pull/34542)
6792 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6793 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6794 rewritten](https://github.com/rust-lang/rust/pull/33895)
6795 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6796 No targets use this yet, but it works toward AVR support.
6801 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6802 * [The new follow-set rules that place restrictions on `macro_rules!`
6803 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6804 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6805 and has been a warning since 1.10.
6806 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6807 This causes breakage in some corner cases.
6810 Version 1.10.0 (2016-07-07)
6811 ===========================
6816 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6817 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6818 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6819 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6820 * [`panic!` can be converted to a runtime abort with the
6821 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6822 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6823 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6824 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6825 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6826 Note that Cargo does not yet directly support cdylibs.
6831 * `os::windows::fs::OpenOptionsExt::access_mode`
6832 * `os::windows::fs::OpenOptionsExt::share_mode`
6833 * `os::windows::fs::OpenOptionsExt::custom_flags`
6834 * `os::windows::fs::OpenOptionsExt::attributes`
6835 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6836 * `os::unix::fs::OpenOptionsExt::custom_flags`
6837 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6838 * `Default for sync::Weak`
6839 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6840 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6841 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6842 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6843 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6844 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6845 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6846 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6847 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6848 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6849 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6850 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6851 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6852 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6853 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6854 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6855 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6856 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6857 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6858 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6859 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6860 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6861 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6862 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6863 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6864 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6865 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6866 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6867 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6868 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6869 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6870 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6871 * Read/Write/RawFd impls for `UnixStream`
6872 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6873 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6874 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6875 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6876 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6877 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6878 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6879 * RawFd impls for `UnixListener`
6880 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6881 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6882 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6883 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6884 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6885 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6886 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6887 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6888 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6889 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6890 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6891 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6892 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6893 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6894 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6895 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6896 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6897 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6898 * RawFd impls for `UnixDatagram`
6899 * `{BTree,Hash}Map::values_mut`
6900 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6905 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6906 The semantics of this minor method are subtle and probably not what
6908 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6909 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6910 will fall back to `/dev/urandom` temporarily to avoid blocking
6911 during early boot](https://github.com/rust-lang/rust/pull/33086).
6912 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6913 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6914 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6915 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6916 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6917 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6918 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6922 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6923 This controls the runtime behavior of the `panic!` macro
6924 and can be either "unwind" (the default), or "abort".
6925 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6926 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6927 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6928 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6929 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6930 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6931 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6932 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6933 By default they are retried twice, which can be customized with the
6934 `net.retry` value in `.cargo/config`.
6935 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6936 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6937 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6938 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6939 Makes it possible to install multiple crates in parallel.
6940 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6941 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6942 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6943 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6944 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6945 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6950 * [rustc memory usage was reduced by refactoring the context used for
6951 type checking](https://github.com/rust-lang/rust/pull/33425).
6952 * [Speed up creation of `HashMap`s by caching the random keys used
6953 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6954 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6955 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6956 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6957 10x faster than the previous lookup tables.
6958 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6963 * Many incremental improvements to documentation and rustdoc.
6964 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6965 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6966 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6967 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6968 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6969 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6970 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6975 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6976 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6977 * [`std` no longer prints backtraces on platforms where the running
6978 module must be loaded with `env::current_exe`, which can't be relied
6979 on](https://github.com/rust-lang/rust/pull/33554).
6980 * This release includes std binaries for the i586-unknown-linux-gnu,
6981 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6982 i586 target is for old x86 hardware without SSE2, and the armv7
6983 target is for Android running on modern ARM architectures.
6984 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6985 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6986 * [On Unix the runtime aborts by calling `libc::abort` instead of
6987 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6988 * [Rust is now bootstrapped from the previous release of Rust,
6989 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6994 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6995 * [`target_env` for Linux ARM targets is just `gnu`, not
6996 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6997 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6998 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6999 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7000 Affects how macros are parsed.
7001 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7002 * [Feature-gated attributes on macro-generated macro invocations are
7003 now rejected](https://github.com/rust-lang/rust/pull/32791).
7004 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7005 This caused some minor changes to type inference.
7008 Version 1.9.0 (2016-05-26)
7009 ==========================
7014 * The `#[deprecated]` attribute when applied to an API will generate
7015 warnings when used. The warnings may be suppressed with
7016 `#[allow(deprecated)]`. [RFC 1270].
7017 * [`fn` item types are zero sized, and each `fn` names a unique
7018 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7019 `transmute` on a `fn` type will generate a warning for a few cycles,
7020 then will be converted to an error.
7021 * [Field and method resolution understand visibility, so private
7022 fields and methods cannot prevent the proper use of public fields
7023 and methods][1.9fv].
7024 * [The parser considers unicode codepoints in the
7025 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7031 * [`std::panic::catch_unwind`] (renamed from `recover`)
7032 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7033 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7034 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7035 * [`str::is_char_boundary`]
7036 * [`<*const T>::as_ref`]
7037 * [`<*mut T>::as_ref`]
7038 * [`<*mut T>::as_mut`]
7039 * [`AsciiExt::make_ascii_uppercase`]
7040 * [`AsciiExt::make_ascii_lowercase`]
7041 * [`char::decode_utf16`]
7042 * [`char::DecodeUtf16`]
7043 * [`char::DecodeUtf16Error`]
7044 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7045 * [`BTreeSet::take`]
7046 * [`BTreeSet::replace`]
7049 * [`HashSet::replace`]
7051 * [`OsString::with_capacity`]
7052 * [`OsString::clear`]
7053 * [`OsString::capacity`]
7054 * [`OsString::reserve`]
7055 * [`OsString::reserve_exact`]
7056 * [`OsStr::is_empty`]
7058 * [`std::os::unix::thread`]
7061 * [`JoinHandleExt::as_pthread_t`]
7062 * [`JoinHandleExt::into_pthread_t`]
7063 * [`HashSet::hasher`]
7064 * [`HashMap::hasher`]
7065 * [`CommandExt::exec`]
7066 * [`File::try_clone`]
7067 * [`SocketAddr::set_ip`]
7068 * [`SocketAddr::set_port`]
7069 * [`SocketAddrV4::set_ip`]
7070 * [`SocketAddrV4::set_port`]
7071 * [`SocketAddrV6::set_ip`]
7072 * [`SocketAddrV6::set_port`]
7073 * [`SocketAddrV6::set_flowinfo`]
7074 * [`SocketAddrV6::set_scope_id`]
7075 * [`slice::copy_from_slice`]
7076 * [`ptr::read_volatile`]
7077 * [`ptr::write_volatile`]
7078 * [`OpenOptions::create_new`]
7079 * [`TcpStream::set_nodelay`]
7080 * [`TcpStream::nodelay`]
7081 * [`TcpStream::set_ttl`]
7082 * [`TcpStream::ttl`]
7083 * [`TcpStream::set_only_v6`]
7084 * [`TcpStream::only_v6`]
7085 * [`TcpStream::take_error`]
7086 * [`TcpStream::set_nonblocking`]
7087 * [`TcpListener::set_ttl`]
7088 * [`TcpListener::ttl`]
7089 * [`TcpListener::set_only_v6`]
7090 * [`TcpListener::only_v6`]
7091 * [`TcpListener::take_error`]
7092 * [`TcpListener::set_nonblocking`]
7093 * [`UdpSocket::set_broadcast`]
7094 * [`UdpSocket::broadcast`]
7095 * [`UdpSocket::set_multicast_loop_v4`]
7096 * [`UdpSocket::multicast_loop_v4`]
7097 * [`UdpSocket::set_multicast_ttl_v4`]
7098 * [`UdpSocket::multicast_ttl_v4`]
7099 * [`UdpSocket::set_multicast_loop_v6`]
7100 * [`UdpSocket::multicast_loop_v6`]
7101 * [`UdpSocket::set_multicast_ttl_v6`]
7102 * [`UdpSocket::multicast_ttl_v6`]
7103 * [`UdpSocket::set_ttl`]
7104 * [`UdpSocket::ttl`]
7105 * [`UdpSocket::set_only_v6`]
7106 * [`UdpSocket::only_v6`]
7107 * [`UdpSocket::join_multicast_v4`]
7108 * [`UdpSocket::join_multicast_v6`]
7109 * [`UdpSocket::leave_multicast_v4`]
7110 * [`UdpSocket::leave_multicast_v6`]
7111 * [`UdpSocket::take_error`]
7112 * [`UdpSocket::connect`]
7113 * [`UdpSocket::send`]
7114 * [`UdpSocket::recv`]
7115 * [`UdpSocket::set_nonblocking`]
7120 * [`std::sync::Once` is poisoned if its initialization function
7122 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7123 * [Most types implement `fmt::Debug`][1.9db].
7124 * [The default buffer size used by `BufReader` and `BufWriter` was
7125 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7126 used by other languages.
7127 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7128 `Duration` additionally implements `*=` and `/=`][1.9ta].
7129 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7130 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7131 * [`Chain` implements `BufRead`][1.9ch].
7132 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7137 * [Cargo can now run concurrently][1.9cc].
7138 * [Top-level overrides allow specific revisions of crates to be
7139 overridden through the entire crate graph][1.9ct]. This is intended
7140 to make upgrades easier for large projects, by allowing crates to be
7141 forked temporarily until they've been upgraded and republished.
7142 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7143 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7144 on the commandline][1.9cf]. `rustc` arguments can also be specified
7145 in the `build.rustflags` configuration key.
7150 * [The time complexity of comparing variables for equivalence during type
7151 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7152 to major compilation time improvement in some scenarios.
7153 * [`ToString` is specialized for `str`, giving it the same performance
7154 as `to_owned`][1.9ts].
7155 * [Spawning processes with `Command::output` no longer creates extra
7157 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7158 for C-like enums][1.9cl].
7163 * [Passing the `--quiet` flag to a test runner will produce
7164 much-abbreviated output][1.9q].
7165 * The Rust Project now publishes std binaries for the
7166 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7167 `i586-pc-windows-msvc` targets.
7172 * [`std::sync::Once` is poisoned if its initialization function
7174 * [It is illegal to define methods with the same name in overlapping
7175 inherent `impl` blocks][1.9sn].
7176 * [`fn` item types are zero sized, and each `fn` names a unique
7177 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7178 `transmute` on a `fn` type will generate a warning for a few cycles,
7179 then will be converted to an error.
7180 * [Improvements to const evaluation may trigger new errors when integer
7181 literals are out of range][1.9ce].
7184 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7185 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7186 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7187 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7188 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7189 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7190 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7191 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7192 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7193 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7194 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7195 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7196 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7197 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7198 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7199 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7200 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7201 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7202 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7203 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7204 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7205 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7206 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7207 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7208 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7209 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7210 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7211 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7212 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7213 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7214 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7215 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7216 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7217 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7218 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7219 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7220 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7221 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7222 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7223 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7224 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7225 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7226 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7227 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7228 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7229 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7230 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7231 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7232 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7233 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7234 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7235 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7236 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7237 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7238 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7239 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7240 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7241 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7242 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7243 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7244 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7245 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7246 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7247 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7248 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7249 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7250 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7251 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7252 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7253 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7254 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7255 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7256 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7257 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7258 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7259 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7260 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7261 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7262 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7263 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7264 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7265 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7266 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7267 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7268 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7269 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7270 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7271 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7272 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7273 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7274 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7275 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7276 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7277 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7278 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7279 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7280 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7281 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7282 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7283 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7284 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7285 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7286 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7287 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7288 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7289 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7290 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7291 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7292 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7293 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7296 Version 1.8.0 (2016-04-14)
7297 ==========================
7302 * Rust supports overloading of compound assignment statements like
7303 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7304 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7305 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7307 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7308 addition to the non-braced form, `struct Foo;`. [RFC 218].
7314 * [`str::encode_utf16`] (renamed from `utf16_units`)
7315 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7318 * [`ptr::drop_in_place`]
7320 * [`time::SystemTime`]
7322 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7323 * [`Instant::elapsed`]
7324 * [`SystemTime::now`]
7325 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7326 * [`SystemTime::elapsed`]
7327 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7328 * [`SystemTimeError`]
7329 * [`SystemTimeError::duration`]
7330 * Various impls for `SystemTimeError`
7332 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7333 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7334 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7335 * [The `write!` and `writeln!` macros correctly emit errors if any of
7336 their arguments can't be formatted][1.8w].
7337 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7338 * [The Unix-specific `raw` modules, which contain a number of
7339 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7340 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7341 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7342 across platforms was making it difficult to implement `std`
7343 correctly. Those that need these definitions should use the `libc`
7345 * The Unix-specific `MetadataExt` traits, including
7346 `os::unix::fs::MetadataExt`, which expose values such as inode
7347 numbers [no longer return platform-specific types][1.8r], but
7348 instead return widened integers. [RFC 1415].
7349 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7350 * [Atomic loads and stores are not volatile][1.8a].
7351 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7356 * [Inlining hash functions lead to a 3% compile-time improvement in
7357 some workloads][1.8h].
7358 * When using jemalloc, its symbols are [unprefixed so that it
7359 overrides the libc malloc implementation][1.8h]. This means that for
7360 rustc, LLVM is now using jemalloc, which results in a 6%
7361 compile-time improvement on a specific workload.
7362 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7367 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7368 i686-pc-windows-msvc is now considered a tier-1 platform.
7369 * [The `--print targets` flag prints a list of supported targets][1.8t].
7370 * [The `--print cfg` flag prints the `cfg`s defined for the current
7372 * [`rustc` can be built with an new Cargo-based build system, written
7373 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7374 build system. To enable it configure with `configure --rustbuild`.
7375 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7376 variants while also indicating the total number of missing variants
7377 if more than 3][1.8m].
7378 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7379 * The Rust Project now publishes binary releases of the standard
7380 library for a number of tier-2 targets:
7381 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7382 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7383 `x86_64-rumprun-netbsd`. These can be installed with
7384 tools such as [multirust][1.8mr].
7389 * [`cargo init` creates a new Cargo project in the current
7390 directory][1.8ci]. It is otherwise like `cargo new`.
7391 * [Cargo has configuration keys for `-v` and
7392 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7393 `[term]` section of `.cargo/config`.
7394 * [Configuration keys that evaluate to strings or integers can be set
7395 via environment variables][1.8ce]. For example the `build.jobs` key
7396 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7397 precedence over config files.
7398 * [Target-specific dependencies support Rust `cfg` syntax for
7399 describing targets][1.8cfg] so that dependencies for multiple
7400 targets can be specified together. [RFC 1361].
7401 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7402 `RUSTDOC` take precedence over the `build.target-dir`,
7403 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7404 * [The child process tree is killed on Windows when Cargo is
7406 * [The `build.target` configuration value sets the target platform,
7407 like `--target`][1.8ct].
7412 * [Unstable compiler flags have been further restricted][1.8u]. Since
7413 1.0 `-Z` flags have been considered unstable, and other flags that
7414 were considered unstable additionally required passing `-Z
7415 unstable-options` to access. Unlike unstable language and library
7416 features though, these options have been accessible on the stable
7417 release channel. Going forward, *new unstable flags will not be
7418 available on the stable release channel*, and old unstable flags
7419 will warn about their usage. In the future, all unstable flags will
7420 be unavailable on the stable release channel.
7421 * [It is no longer possible to `match` on empty enum variants using
7422 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7423 * The Unix-specific `MetadataExt` traits, including
7424 `os::unix::fs::MetadataExt`, which expose values such as inode
7425 numbers [no longer return platform-specific types][1.8r], but
7426 instead return widened integers. [RFC 1415].
7427 * [Modules sourced from the filesystem cannot appear within arbitrary
7428 blocks, but only within other modules][1.8mf].
7429 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7430 * On Unix, [stack overflow triggers a runtime abort instead of a
7432 * [`Command::spawn` and its equivalents return an error if any of
7433 its command-line arguments contain interior `NUL`s][1.8n].
7434 * [Tuple and unit enum variants from other crates are in the type
7436 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7437 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7438 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7439 instead of `foo.lib`.
7442 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7443 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7444 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7445 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7446 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7447 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7448 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7449 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7450 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7451 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7452 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7453 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7454 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7455 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7456 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7457 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7458 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7459 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7460 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7461 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7462 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7463 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7464 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7465 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7466 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7467 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7468 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7469 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7470 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7471 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7472 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7473 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7474 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7475 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7476 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7477 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7478 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7479 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7480 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7481 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7482 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7483 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7484 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7485 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7486 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7487 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7488 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7489 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7490 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7491 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7492 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7493 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7494 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7495 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7496 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7497 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7498 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7499 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7500 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7501 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7504 Version 1.7.0 (2016-03-03)
7505 ==========================
7512 * [`Path::strip_prefix`] (renamed from relative_from)
7513 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7515 * [`Ipv4Addr::is_loopback`]
7516 * [`Ipv4Addr::is_private`]
7517 * [`Ipv4Addr::is_link_local`]
7518 * [`Ipv4Addr::is_multicast`]
7519 * [`Ipv4Addr::is_broadcast`]
7520 * [`Ipv4Addr::is_documentation`]
7522 * [`Ipv6Addr::is_unspecified`]
7523 * [`Ipv6Addr::is_loopback`]
7524 * [`Ipv6Addr::is_multicast`]
7527 * [`Vec::as_mut_slice`]
7529 * [`String::as_str`]
7530 * [`String::as_mut_str`]
7532 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7534 * `<[T]>::`[`sort_by_key`]
7535 * checked, saturated, and overflowing operations
7536 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7537 * [`i32::saturating_mul`]
7538 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7539 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7540 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7541 * [`u32::saturating_mul`]
7542 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7543 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7544 * and checked, saturated, and overflowing operations for other primitive types
7546 * [`ffi::IntoStringError`]
7547 * [`CString::into_string`]
7548 * [`CString::into_bytes`]
7549 * [`CString::into_bytes_with_nul`]
7550 * `From<CString> for Vec<u8>`
7552 * [`IntoStringError::into_cstring`]
7553 * [`IntoStringError::utf8_error`]
7554 * `Error for IntoStringError`
7556 * [`std::hash::BuildHasher`]
7557 * [`BuildHasher::Hasher`]
7558 * [`BuildHasher::build_hasher`]
7559 * [`std::hash::BuildHasherDefault`]
7560 * [`HashMap::with_hasher`]
7561 * [`HashMap::with_capacity_and_hasher`]
7562 * [`HashSet::with_hasher`]
7563 * [`HashSet::with_capacity_and_hasher`]
7564 * [`std::collections::hash_map::RandomState`]
7565 * [`RandomState::new`]
7566 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7567 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7568 from bytes is faster.
7569 * [The performance of `LineWriter` (and thus `io::stdout`) was
7570 improved by using `memchr` to search for newlines][1.7m].
7571 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7572 `f64` variants were stabilized previously.
7573 * [`BTreeMap` was rewritten to use less memory and improve the performance
7574 of insertion and iteration, the latter by as much as 5x][1.7bm].
7575 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7576 covariant over their contained type][1.7bt].
7577 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7578 over their contained type][1.7ll].
7579 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7581 * [`Any` is implemented for unsized types][1.7a].
7582 * [`Hash` is implemented for `Duration`][1.7h].
7587 * [When running tests with `--test`, rustdoc will pass `--cfg`
7588 arguments to the compiler][1.7dt].
7589 * [The compiler is built with RPATH information by default][1.7rpa].
7590 This means that it will be possible to run `rustc` when installed in
7591 unusual configurations without configuring the dynamic linker search
7593 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7594 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7595 over `LD_LIBRARY_PATH`.
7600 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7601 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7602 * [The `rerun-if-changed` build script directive no longer causes the
7603 build script to incorrectly run twice in certain scenarios][1.7rr].
7608 * Soundness fixes to the interactions between associated types and
7609 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7610 code that violates the new rules. This is a significant change that
7611 is known to break existing code, so it has emitted warnings for the
7612 new error cases since 1.4 to give crate authors time to adapt. The
7613 details of what is changing are subtle; read the RFC for more.
7614 * [Several bugs in the compiler's visibility calculations were
7615 fixed][1.7v]. Since this was found to break significant amounts of
7616 code, the new errors will be emitted as warnings for several release
7617 cycles, under the `private_in_public` lint.
7618 * Defaulted type parameters were accidentally accepted in positions
7619 that were not intended. In this release, [defaulted type parameters
7620 appearing outside of type definitions will generate a
7621 warning][1.7d], which will become an error in future releases.
7622 * [Parsing "." as a float results in an error instead of 0][1.7p].
7623 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7624 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7626 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7627 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7628 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7629 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7630 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7631 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7632 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7633 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7634 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7635 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7636 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7637 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7638 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7639 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7640 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7641 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7642 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7643 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7644 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7645 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7646 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7647 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7648 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7649 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7650 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7651 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7652 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7653 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7654 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7655 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7656 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7657 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7658 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7659 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7660 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7661 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7662 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7663 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7664 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7665 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7666 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7667 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7668 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7669 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7670 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7671 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7672 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7673 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7674 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7675 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7676 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7677 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7678 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7679 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7680 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7681 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7682 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7683 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7684 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7685 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7686 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7687 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7688 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7689 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7690 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7691 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7692 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7693 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7694 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7695 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7696 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7697 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7698 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7699 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7700 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7701 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7702 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7703 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7704 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7707 Version 1.6.0 (2016-01-21)
7708 ==========================
7713 * The `#![no_std]` attribute causes a crate to not be linked to the
7714 standard library, but only the [core library][1.6co], as described
7715 in [RFC 1184]. The core library defines common types and traits but
7716 has no platform dependencies whatsoever, and is the basis for Rust
7717 software in environments that cannot support a full port of the
7718 standard library, such as operating systems. Most of the core
7719 library is now stable.
7725 [`Read::read_exact`],
7726 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7727 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7728 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7729 [`os::unix::fs::DirBuilderExt`],
7730 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7731 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7732 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7733 [`collections::hash_map::Drain`],
7734 [`collections::hash_map::HashMap::drain`],
7735 [`collections::hash_set::Drain`],
7736 [`collections::hash_set::HashSet::drain`],
7737 [`collections::binary_heap::Drain`],
7738 [`collections::binary_heap::BinaryHeap::drain`],
7739 [`Vec::extend_from_slice`] (renamed from `push_all`),
7740 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7741 [`RwLock::into_inner`],
7742 [`Iterator::min_by_key`] (renamed from `min_by`),
7743 [`Iterator::max_by_key`] (renamed from `max_by`).
7744 * The [core library][1.6co] is stable, as are most of its APIs.
7745 * [The `assert_eq!` macro supports arguments that don't implement
7746 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7748 * Several timer functions that take duration in milliseconds [are
7749 deprecated in favor of those that take `Duration`][1.6ms]. These
7750 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7751 `thread::park_timeout_ms`.
7752 * The algorithm by which `Vec` reserves additional elements was
7753 [tweaked to not allocate excessive space][1.6a] while still growing
7755 * `From` conversions are [implemented from integers to floats][1.6f]
7756 in cases where the conversion is lossless. Thus they are not
7757 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7758 or `f64`. They are also not implemented for `isize` and `usize`
7759 because the implementations would be platform-specific. `From` is
7760 also implemented from `f32` to `f64`.
7761 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7762 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7763 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7764 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7766 * Sorting slices that are already sorted [is 50% faster in some
7772 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7773 * Cargo build scripts can specify their dependencies by emitting the
7774 [`rerun-if-changed`][1.6rr] key.
7775 * crates.io will reject publication of crates with dependencies that
7776 have a wildcard version constraint. Crates with wildcard
7777 dependencies were seen to cause a variety of problems, as described
7778 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7780 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7781 release folder. A variety of artifacts that Cargo failed to clean
7782 are now correctly deleted.
7787 * The `unreachable_code` lint [warns when a function call's argument
7789 * The parser indicates [failures that may be caused by
7790 confusingly-similar Unicode characters][1.6uc]
7791 * Certain macro errors [are reported at definition time][1.6m], not
7797 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7798 environment variable when locating crates. This was a pre-cargo
7799 feature for integrating with the package manager that was
7800 accidentally never removed.
7801 * [A number of bugs were fixed in the privacy checker][1.6p] that
7802 could cause previously-accepted code to break.
7803 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7804 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7805 struct pattern syntax (`Foo(..)`) can no longer be used to match
7806 unit structs. This is a warning now, but will become an error in
7807 future releases. Patterns that share the same name as a const are
7809 * A bug was fixed that causes [rustc not to apply default type
7810 parameters][1.6xc] when resolving certain method implementations of
7811 traits defined in other crates.
7813 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7814 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7815 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7816 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7817 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7818 [1.6co]: http://doc.rust-lang.org/core/index.html
7819 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7820 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7821 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7822 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7823 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7824 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7825 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7826 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7827 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7828 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7829 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7830 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7831 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7832 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7833 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7834 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7835 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7836 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7837 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7838 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7839 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7840 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7841 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7842 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7843 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7844 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7845 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7846 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7847 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7848 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7849 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7850 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7851 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7852 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7853 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7854 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7855 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7856 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7857 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7858 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7859 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7862 Version 1.5.0 (2015-12-10)
7863 ==========================
7865 * ~700 changes, numerous bugfixes
7871 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7872 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7873 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7874 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7875 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7876 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7877 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7878 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7879 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7880 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7881 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7882 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7883 [`Path::read_link`], [`Path::symlink_metadata`],
7884 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7885 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7886 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7887 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7888 [`slice::split_first_mut`], [`slice::split_first`],
7889 [`slice::split_last_mut`], [`slice::split_last`],
7890 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7891 [`str::MatchIndices`], [`str::RMatchIndices`],
7892 [`str::match_indices`], [`str::rmatch_indices`],
7893 [`str::slice_mut_unchecked`], [`string::ParseError`].
7894 * Rust applications hosted on crates.io can be installed locally to
7895 `~/.cargo/bin` with the [`cargo install`] command. Among other
7896 things this makes it easier to augment Cargo with new subcommands:
7897 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7898 invoked as `cargo foo`.
7899 * Crates with wildcard (`*`) dependencies will [emit warnings when
7900 published][1.5w]. In 1.6 it will no longer be possible to publish
7901 crates with wildcard dependencies.
7906 * The rules determining when a particular lifetime must outlive
7907 a particular value (known as '[dropck]') have been [modified
7908 to not rely on parametricity][1.5p].
7909 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7910 and `Arc`][1.5a]. Because these smart pointer types implement
7911 `Deref`, this causes breakage in cases where the interior type
7912 contains methods of the same name.
7913 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7914 that they could drop their content. Soundness fix.
7915 * All method invocations are [properly checked][1.5wf1] for
7916 [well-formedness][1.5wf2]. Soundness fix.
7917 * Traits whose supertraits contain `Self` are [not object
7918 safe][1.5o]. Soundness fix.
7919 * Target specifications support a [`no_default_libraries`][1.5nd]
7920 setting that controls whether `-nodefaultlibs` is passed to the
7921 linker, and in turn the `is_like_windows` setting no longer affects
7922 the `-nodefaultlibs` flag.
7923 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7924 * The `#[inline]` and `#[repr]` attributes [can only appear
7925 in valid locations][1.5at].
7926 * Native libraries linked from the local crate are [passed to
7927 the linker before native libraries from upstream crates][1.5nl].
7928 * Two rarely-used attributes, `#[no_debug]` and
7929 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7930 * Negation of unsigned integers, which has been a warning for
7931 several releases, [is now behind a feature gate and will
7932 generate errors][1.5nu].
7933 * The parser accidentally accepted visibility modifiers on
7934 enum variants, a bug [which has been fixed][1.5ev].
7935 * [A bug was fixed that allowed `use` statements to import unstable
7941 * When evaluating expressions at compile-time that are not
7942 compile-time constants (const-evaluating expressions in non-const
7943 contexts), incorrect code such as overlong bitshifts and arithmetic
7944 overflow will [generate a warning instead of an error][1.5ce],
7945 delaying the error until runtime. This will allow the
7946 const-evaluator to be expanded in the future backwards-compatibly.
7947 * The `improper_ctypes` lint [no longer warns about using `isize` and
7948 `usize` in FFI][1.5ict].
7953 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7955 * `Default` is [implemented for mutable slices][1.5d].
7956 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7957 * There are now `From` conversions [between floating point
7958 types][1.5f] where the conversions are lossless.
7959 * There are now `From` conversions [between integer types][1.5i] where
7960 the conversions are lossless.
7961 * [`fs::Metadata` implements `Clone`][1.5fs].
7962 * The `parse` method [accepts a leading "+" when parsing
7964 * [`AsMut` is implemented for `Vec`][1.5am].
7965 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7966 been optimized][1.5cf] and no longer rely on the default impl.
7967 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7968 `unsafe extern "C"` function types now [implement `Clone`,
7969 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7970 `fmt::Debug` for up to 12 arguments][1.5fp].
7971 * [Dropping `Vec`s is much faster in unoptimized builds when the
7972 element types don't implement `Drop`][1.5dv].
7973 * A bug that caused in incorrect behavior when [combining `VecDeque`
7974 with zero-sized types][1.5vdz] was resolved.
7975 * [`PartialOrd` for slices is faster][1.5po].
7980 * [Crate metadata size was reduced by 20%][1.5md].
7981 * [Improvements to code generation reduced the size of libcore by 3.3
7982 MB and rustc's memory usage by 18MB][1.5m].
7983 * [Improvements to deref translation increased performance in
7984 unoptimized builds][1.5dr].
7985 * Various errors in trait resolution [are deduplicated to only be
7986 reported once][1.5te].
7987 * Rust has preliminary [support for rumprun kernels][1.5rr].
7988 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7990 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7991 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7992 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7993 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7994 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7995 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7996 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7997 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7998 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7999 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8000 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8001 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8002 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8003 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8004 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8005 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8006 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8007 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8008 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8009 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8010 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8011 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8012 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8013 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8014 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8015 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8016 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8017 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8018 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8019 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8020 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8021 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8022 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8023 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8024 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8025 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8026 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8027 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8028 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8029 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8030 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8031 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8032 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8033 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8034 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8035 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8036 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8037 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8038 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8039 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8040 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8041 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8042 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8043 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8044 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8045 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8046 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8047 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8048 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8049 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8050 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8051 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8052 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8053 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8054 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8055 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8056 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8057 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8058 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8059 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8060 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8061 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8062 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8063 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8064 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8065 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8066 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8067 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8068 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8069 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8070 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8071 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8072 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8073 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8074 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8075 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8076 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8077 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8078 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8080 Version 1.4.0 (2015-10-29)
8081 ==========================
8083 * ~1200 changes, numerous bugfixes
8088 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8089 GNU) are now supported and recommended for use.
8094 * [Several changes have been made to fix type soundness and improve
8095 the behavior of associated types][sound]. See [RFC 1214]. Although
8096 we have mostly introduced these changes as warnings this release, to
8097 become errors next release, there are still some scenarios that will
8098 see immediate breakage.
8099 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8100 line breaks in addition to `\n`][crlf].
8101 * [Loans of `'static` lifetime extend to the end of a function][stat].
8102 * [`str::parse` no longer introduces avoidable rounding error when
8103 parsing floating point numbers. Together with earlier changes to
8104 float formatting/output, "round trips" like f.to_string().parse()
8105 now preserve the value of f exactly. Additionally, leading plus
8106 signs are now accepted][fp3].
8112 * `use` statements that import multiple items [can now rename
8113 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8114 * [Binops work correctly on fat pointers][binfat].
8115 * `pub extern crate`, which does not behave as expected, [issues a
8116 warning][pec] until a better solution is found.
8121 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8122 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8123 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8124 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8125 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8126 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8127 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8128 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8129 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8130 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8131 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8132 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8133 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8134 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8135 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8136 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8137 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8138 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8140 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8141 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8142 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8143 `f64::from_str_radix`.
8144 * [Reverse-searching strings is faster with the 'two-way'
8146 * [`std::io::copy` allows `?Sized` arguments][cc].
8147 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8148 [override `count`, `nth` and `last` with an O(1)
8149 implementation][it].
8150 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8151 * [`IntoRawFd` has been added to the Unix-specific prelude,
8152 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8154 * [`Extend<String>` and `FromIterator<String` are both implemented for
8156 * [`IntoIterator` is implemented for references to `Option` and
8158 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8159 Copy`][ext] as part of [RFC 839]. This will cause type inference
8160 breakage in rare situations.
8161 * [`BinaryHeap` implements `Debug`][bh2].
8162 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8164 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8165 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8166 * [String comparison is faster][faststr].
8167 * `&mut T` where `T: std::fmt::Write` [also implements
8168 `std::fmt::Write`][mutw].
8169 * [A stable regression in `VecDeque::push_back` and other
8170 capacity-altering methods that caused panics for zero-sized types
8172 * [Function pointers implement traits for up to 12 parameters][fp2].
8177 * The compiler [no longer uses the 'morestack' feature to prevent
8178 stack overflow][mm]. Instead it uses guard pages and stack
8179 probes (though stack probes are not yet implemented on any platform
8181 * [The compiler matches traits faster when projections are involved][p].
8182 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8184 * [Cargo now displays useful information about what its doing during
8185 `cargo update`][cu].
8187 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8188 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8189 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8190 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8191 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8192 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8193 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8194 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8195 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8196 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8197 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8198 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8199 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8200 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8201 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8202 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8203 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8204 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8205 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8206 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8207 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8208 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8209 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8210 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8211 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8212 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8213 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8214 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8215 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8216 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8217 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8218 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8219 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8220 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8221 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8222 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8223 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8224 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8225 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8226 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8227 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8228 [bh2]: https://github.com/rust-lang/rust/pull/28156
8229 [binfat]: https://github.com/rust-lang/rust/pull/28270
8230 [bm]: https://github.com/rust-lang/rust/pull/28197
8231 [cc]: https://github.com/rust-lang/rust/pull/27531
8232 [crlf]: https://github.com/rust-lang/rust/pull/28034
8233 [cu]: https://github.com/rust-lang/cargo/pull/1931
8234 [d]: https://github.com/rust-lang/rust/pull/27825
8235 [dep]: https://github.com/rust-lang/rust/pull/28339
8236 [es]: https://github.com/rust-lang/rust/pull/27956
8237 [ext]: https://github.com/rust-lang/rust/pull/28094
8238 [faststr]: https://github.com/rust-lang/rust/pull/28338
8239 [ffi]: https://github.com/rust-lang/rust/pull/28779
8240 [fp]: https://github.com/rust-lang/rust/pull/28268
8241 [fp2]: https://github.com/rust-lang/rust/pull/28560
8242 [fp3]: https://github.com/rust-lang/rust/pull/27307
8243 [i]: https://github.com/rust-lang/rust/pull/27451
8244 [into2]: https://github.com/rust-lang/rust/pull/28039
8245 [it]: https://github.com/rust-lang/rust/pull/27652
8246 [mm]: https://github.com/rust-lang/rust/pull/27338
8247 [mutw]: https://github.com/rust-lang/rust/pull/28368
8248 [sound]: https://github.com/rust-lang/rust/pull/27641
8249 [p]: https://github.com/rust-lang/rust/pull/27866
8250 [pec]: https://github.com/rust-lang/rust/pull/28486
8251 [pr]: https://github.com/rust-lang/rust/pull/27896
8252 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8253 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8254 [s]: https://github.com/rust-lang/rust/pull/27474
8255 [stab]: https://github.com/rust-lang/rust/pull/28339
8256 [stat]: https://github.com/rust-lang/rust/pull/28321
8257 [vd]: https://github.com/rust-lang/rust/pull/28494
8259 Version 1.3.0 (2015-09-17)
8260 ==============================
8262 * ~900 changes, numerous bugfixes
8267 * The [new object lifetime defaults][nold] have been [turned
8268 on][nold2] after a cycle of warnings about the change. Now types
8269 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8270 being interpreted as `&'a Box<Trait+'a>` to `&'a
8271 Box<Trait+'static>`.
8272 * [The Rustonomicon][nom] is a new book in the official documentation
8273 that dives into writing unsafe Rust.
8274 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8275 timekeeping is employed by other std APIs, as well as out-of-tree
8281 * The [new object lifetime defaults][nold] have been [turned
8282 on][nold2] after a cycle of warnings about the change.
8283 * There is a known [regression][lr] in how object lifetime elision is
8284 interpreted, the proper solution for which is undetermined.
8285 * The `#[prelude_import]` attribute, an internal implementation
8286 detail, was accidentally stabilized previously. [It has been put
8287 behind the `prelude_import` feature gate][pi]. This change is
8288 believed to break no existing code.
8289 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8290 [more sane for dynamically sized types][dst3]. Code that relied on
8291 the previous behavior is thought to be broken.
8292 * The `dropck` rules, which checks that destructors can't access
8293 destroyed values, [have been updated][dropck] to match the
8294 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8295 cause some previously-compiling code to no longer build.
8300 * The [new object lifetime defaults][nold] have been [turned
8301 on][nold2] after a cycle of warnings about the change.
8302 * Semicolons may [now follow types and paths in
8303 macros](https://github.com/rust-lang/rust/pull/27000).
8304 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8305 [more sane for dynamically sized types][dst3]. Code that relied on
8306 the previous behavior is not known to exist, and suspected to be
8308 * `'static` variables [may now be recursive][st].
8309 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8310 implementations correctly.
8311 * The `dropck` rules, which checks that destructors can't access
8312 destroyed values, [have been updated][dropck] to match the
8318 * The [`Duration`] API, [has been stabilized][ds], as well as the
8319 `std::time` module, which presently contains only `Duration`.
8320 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8321 * The owned C string, [`CString`], implements [`Borrow`] and the
8322 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8323 these allow C strings to be borrowed and cloned in generic code.
8324 * [`CStr`] implements [`Debug`].
8325 * [`AtomicPtr`] implements [`Debug`].
8326 * [`Error`] trait objects [can be downcast to their concrete types][e]
8327 in many common configurations, using the [`is`], [`downcast`],
8328 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8330 * Searching for substrings now [employs the two-way algorithm][search]
8331 instead of doing a naive search. This gives major speedups to a
8332 number of methods, including [`contains`][sc], [`find`][sf],
8333 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8334 [`ends_with`][sew] are also faster.
8335 * The performance of `PartialEq` for slices is [much faster][ps].
8336 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8337 is overridden and optimized by the implementations for scalars.
8338 * The [`Hasher`] trait now has a number of specialized `write_*`
8339 methods for primitive types, for efficiency.
8340 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8341 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8342 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8343 of [`std::error::Error::cause`][iec] also delegates to the inner
8345 * [`process::Child`][pc] gained the [`id`] method, which returns a
8346 `u32` representing the platform-specific process identifier.
8347 * The [`connect`] method on slices is deprecated, replaced by the new
8348 [`join`] method (note that both of these are on the *unstable*
8349 [`SliceConcatExt`] trait, but through the magic of the prelude are
8350 available to stable code anyway).
8351 * The [`Div`] operator is implemented for [`Wrapping`] types.
8352 * [`DerefMut` is implemented for `String`][dms].
8353 * Performance of SipHash (the default hasher for `HashMap`) is
8354 [better for long data][sh].
8355 * [`AtomicPtr`] implements [`Send`].
8356 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8357 are now [specialized to use uninitialized buffers for increased
8359 * Lifetime parameters of foreign functions [are now resolved
8365 * Rust can now, with some coercion, [produce programs that run on
8366 Windows XP][xp], though XP is not considered a supported platform.
8367 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8368 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8369 recommended for use in 1.3, though should be fully-functional
8370 in the [64-bit 1.4 beta][b14].
8371 * On Fedora-based systems installation will [properly configure the
8372 dynamic linker][fl].
8373 * The compiler gained many new extended error descriptions, which can
8374 be accessed with the `--explain` flag.
8375 * The `dropck` pass, which checks that destructors can't access
8376 destroyed values, [has been rewritten][dropck]. This fixes some
8377 soundness holes, and as such will cause some previously-compiling
8378 code to no longer build.
8379 * `rustc` now uses [LLVM to write archive files where possible][ar].
8380 Eventually this will eliminate the compiler's dependency on the ar
8382 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8383 supported FreeBSD on x86_64).
8384 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8385 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8387 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8388 will kill the process instead of leaking][nlp].
8390 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8391 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8392 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8393 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8394 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8395 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8396 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8397 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8398 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8399 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8400 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8401 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8402 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8403 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8404 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8405 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8406 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8407 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8408 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8409 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8410 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8411 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8412 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8413 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8414 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8415 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8416 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8417 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8418 [ar]: https://github.com/rust-lang/rust/pull/26926
8419 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8420 [dms]: https://github.com/rust-lang/rust/pull/26241
8421 [dropck]: https://github.com/rust-lang/rust/pull/27261
8422 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8423 [ds]: https://github.com/rust-lang/rust/pull/26818
8424 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8425 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8426 [dst3]: https://github.com/rust-lang/rust/pull/27351
8427 [e]: https://github.com/rust-lang/rust/pull/24793
8428 [f]: https://github.com/rust-lang/rust/pull/26588
8429 [fb]: https://github.com/rust-lang/rust/pull/26959
8430 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8431 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8432 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8433 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8434 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8435 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8436 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8437 [lic]: https://github.com/rust-lang/rust/pull/26583
8438 [lnu]: https://github.com/rust-lang/rust/pull/27026
8439 [lr]: https://github.com/rust-lang/rust/issues/27248
8440 [lum]: https://github.com/rust-lang/rust/pull/26378
8441 [lur]: https://github.com/rust-lang/rust/pull/26783
8442 [nlp]: https://github.com/rust-lang/rust/pull/27176
8443 [nold2]: https://github.com/rust-lang/rust/pull/27045
8444 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8445 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8446 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8447 [pi]: https://github.com/rust-lang/rust/pull/26699
8448 [ps]: https://github.com/rust-lang/rust/pull/26884
8449 [rte]: https://github.com/rust-lang/rust/pull/26950
8450 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8451 [search]: https://github.com/rust-lang/rust/pull/26327
8452 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8453 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8454 [sh]: https://github.com/rust-lang/rust/pull/27280
8455 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8456 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8457 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8458 [st]: https://github.com/rust-lang/rust/pull/26630
8459 [win1]: https://github.com/rust-lang/rust/pull/26569
8460 [win2]: https://github.com/rust-lang/rust/pull/26741
8461 [win3]: https://github.com/rust-lang/rust/pull/26741
8462 [win4]: https://github.com/rust-lang/rust/pull/27210
8463 [xp]: https://github.com/rust-lang/rust/pull/26569
8465 Version 1.2.0 (2015-08-07)
8466 ==========================
8468 * ~1200 changes, numerous bugfixes
8473 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8474 like `Rc` to contain types without a fixed size, arrays and trait
8475 objects, finally enabling use of `Rc<[T]>` and completing the
8476 implementation of DST.
8477 * [Parallel codegen][parcodegen] is now working again, which can
8478 substantially speed up large builds in debug mode; It also gets
8479 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8480 jobs). It's not enabled by default, but will be "in the near
8481 future". It can be activated with the `-C codegen-units=N` flag to
8483 * This is the first release with [experimental support for linking
8484 with the MSVC linker and lib C on Windows (instead of using the GNU
8485 variants via MinGW)][win]. It is yet recommended only for the most
8486 intrepid Rustaceans.
8487 * Benchmark compilations are showing a 30% improvement in
8488 bootstrapping over 1.1.
8493 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8494 unicode case mapping, which is a previously-planned change in
8495 behavior and considered a bugfix.
8496 * [`mem::align_of`] now specifies [the *minimum alignment* for
8497 T][align], which is usually the alignment programs are interested
8498 in, and the same value reported by clang's
8499 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8501 * [The `#[packed]` attribute is no longer silently accepted by the
8502 compiler][packed]. This attribute did nothing and code that
8503 mentioned it likely did not work as intended.
8504 * Associated type defaults are [now behind the
8505 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8506 defaults *did not work*, but could be mentioned syntactically. As
8507 such this breakage has minimal impact.
8512 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8513 matching against dereferenceable values.
8518 * The [`Extend`] trait, which grows a collection from an iterator, is
8519 implemented over iterators of references, for `String`, `Vec`,
8520 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8521 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8522 * The [`iter::once`] function returns an iterator that yields a single
8523 element, and [`iter::empty`] returns an iterator that yields no
8525 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8526 over substring matches.
8527 * [`Cell`] and [`RefCell`] both implement `Eq`.
8528 * A number of methods for wrapping arithmetic are added to the
8529 integral types, [`wrapping_div`], [`wrapping_rem`],
8530 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8531 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8532 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8533 type.. It is illegal for the default arithmetic operations in Rust
8534 to overflow; the desire to wrap must be explicit.
8535 * The `{:#?}` formatting specifier [displays the alternate,
8536 pretty-printed][debugfmt] form of the `Debug` formatter. This
8537 feature was actually introduced prior to 1.0 with little
8539 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8540 for writing data to formatted strings, similar to [`io::Write`].
8541 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8542 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8543 are used by code generators to emit implementations of [`Debug`].
8544 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8545 methods that convert case, following Unicode case mapping.
8546 * It is now easier to handle poisoned locks. The [`PoisonError`]
8547 type, returned by failing lock operations, exposes `into_inner`,
8548 `get_ref`, and `get_mut`, which all give access to the inner lock
8549 guard, and allow the poisoned lock to continue to operate. The
8550 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8551 poisoned lock without attempting to take the lock.
8552 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8553 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8554 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8555 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8557 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8563 * `rustc` employs smarter heuristics for guessing at [typos].
8564 * `rustc` emits more efficient code for [no-op conversions between
8565 unsafe pointers][nop].
8566 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8567 resulting in faster compile times and smaller code.
8569 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8570 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8571 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8572 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8573 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8574 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8575 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8576 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8577 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8578 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8579 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8580 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8581 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8582 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8583 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8584 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8585 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8586 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8587 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8588 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8589 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8590 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8591 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8592 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8593 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8594 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8595 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8596 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8597 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8598 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8599 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8600 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8601 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
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 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8605 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8606 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8607 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8608 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8609 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8610 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8611 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8612 [align]: https://github.com/rust-lang/rust/pull/25646
8613 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8614 [typos]: https://github.com/rust-lang/rust/pull/26087
8615 [nop]: https://github.com/rust-lang/rust/pull/26336
8616 [fat]: https://github.com/rust-lang/rust/pull/26411
8617 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8618 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8619 [packed]: https://github.com/rust-lang/rust/pull/25541
8620 [ad]: https://github.com/rust-lang/rust/pull/27382
8621 [win]: https://github.com/rust-lang/rust/pull/25350
8623 Version 1.1.0 (2015-06-25)
8624 =========================
8626 * ~850 changes, numerous bugfixes
8631 * The [`std::fs` module has been expanded][fs] to expand the set of
8632 functionality exposed:
8633 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8634 don't incur a syscall on some platforms.
8635 * A `symlink_metadata` function has been added.
8636 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8637 access to all underlying information.
8638 * The compiler now contains extended explanations of many errors. When an error
8639 with an explanation occurs the compiler suggests using the `--explain` flag
8640 to read the explanation. Error explanations are also [available online][err-index].
8641 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8642 well as other work, the time to bootstrap the compiler decreased by
8648 * The [`str::split_whitespace`] method splits a string on unicode
8649 whitespace boundaries.
8650 * On both Windows and Unix, new extension traits provide conversion of
8651 I/O types to and from the underlying system handles. On Unix, these
8652 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8653 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8654 `TcpListener`, and `UpdSocket`. Further implementations for
8655 `std::process` will be stabilized later.
8656 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8657 Windows, symlinks can be created with
8658 `std::os::windows::symlink_dir` and
8659 `std::os::windows::symlink_file`.
8660 * The `mpsc::Receiver` type can now be converted into an iterator with
8661 `into_iter` on the [`IntoIterator`] trait.
8662 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8663 implementation of the [`From`] trait.
8664 * The `Debug` implementation for `RangeFull` [creates output that is
8665 more consistent with other implementations][rf].
8666 * [`Debug` is implemented for `File`][file].
8667 * The `Default` implementation for `Arc` [no longer requires `Sync +
8669 * [The `Iterator` methods `count`, `nth`, and `last` have been
8670 overridden for slices to have O(1) performance instead of O(n)][si].
8671 * Incorrect handling of paths on Windows has been improved in both the
8672 compiler and the standard library.
8673 * [`AtomicPtr` gained a `Default` implementation][ap].
8674 * In accordance with Rust's policy on arithmetic overflow `abs` now
8675 [panics on overflow when debug assertions are enabled][abs].
8676 * The [`Cloned`] iterator, which was accidentally left unstable for
8677 1.0 [has been stabilized][c].
8678 * The [`Incoming`] iterator, which iterates over incoming TCP
8679 connections, and which was accidentally unnamable in 1.0, [is now
8680 properly exported][inc].
8681 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8682 `sift_up` or `sift_down` panic][bh].
8683 * The [`split_off`] method of `LinkedList` [no longer corrupts
8684 the list in certain scenarios][ll].
8689 * Type checking performance [has improved notably][sk] with
8690 [multiple improvements][pre].
8691 * The compiler [suggests code changes][ch] for more errors.
8692 * rustc and it's build system have experimental support for [building
8693 toolchains against MUSL][m] instead of glibc on Linux.
8694 * The compiler defines the `target_env` cfg value, which is used for
8695 distinguishing toolchains that are otherwise for the same
8696 platform. Presently this is set to `gnu` for common GNU Linux
8697 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8698 * The [`cargo rustc`][crc] command invokes a build with custom flags
8700 * [Android executables are always position independent][pie].
8701 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8704 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8705 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8706 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8707 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8708 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8709 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8710 [rf]: https://github.com/rust-lang/rust/pull/24491
8711 [err-index]: https://doc.rust-lang.org/error-index.html
8712 [sk]: https://github.com/rust-lang/rust/pull/24615
8713 [pre]: https://github.com/rust-lang/rust/pull/25323
8714 [file]: https://github.com/rust-lang/rust/pull/24598
8715 [ch]: https://github.com/rust-lang/rust/pull/24683
8716 [arc]: https://github.com/rust-lang/rust/pull/24695
8717 [si]: https://github.com/rust-lang/rust/pull/24701
8718 [ap]: https://github.com/rust-lang/rust/pull/24834
8719 [m]: https://github.com/rust-lang/rust/pull/24777
8720 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8721 [crc]: https://github.com/rust-lang/cargo/pull/1568
8722 [pie]: https://github.com/rust-lang/rust/pull/24953
8723 [abs]: https://github.com/rust-lang/rust/pull/25441
8724 [c]: https://github.com/rust-lang/rust/pull/25496
8725 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8726 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8727 [inc]: https://github.com/rust-lang/rust/pull/25522
8728 [bh]: https://github.com/rust-lang/rust/pull/25856
8729 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8730 [ll]: https://github.com/rust-lang/rust/pull/26022
8731 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8732 [drop]: https://github.com/rust-lang/rust/pull/24935
8734 Version 1.0.0 (2015-05-15)
8735 ========================
8737 * ~1500 changes, numerous bugfixes
8742 * The vast majority of the standard library is now `#[stable]`. It is
8743 no longer possible to use unstable features with a stable build of
8745 * Many popular crates on [crates.io] now work on the stable release
8747 * Arithmetic on basic integer types now [checks for overflow in debug
8753 * Several [restrictions have been added to trait coherence][coh] in
8754 order to make it easier for upstream authors to change traits
8755 without breaking downstream code.
8756 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8757 improve error messages and macro behavior. For example, `0b1234` is
8758 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8759 * Trait bounds [are always invariant][inv], eliminating the need for
8760 the `PhantomFn` and `MarkerTrait` lang items, which have been
8762 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8763 "foo" as bar` syntax has been replaced with `extern crate foo as
8764 bar`, and Cargo now automatically translates "-" in *package* names
8765 to underscore for the crate name.
8766 * [Lifetime shadowing is an error][lt].
8767 * [`Send` no longer implies `'static`][send-rfc].
8768 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8769 `MyType::default()`.
8770 * Primitive types [now have inherent methods][prim-inherent],
8771 obviating the need for extension traits like `SliceExt`.
8772 * Methods with `Self: Sized` in their `where` clause are [considered
8773 object-safe][self-sized], allowing many extension traits like
8774 `IteratorExt` to be merged into the traits they extended.
8775 * You can now [refer to associated types][assoc-where] whose
8776 corresponding trait bounds appear only in a `where` clause.
8777 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8778 like `Send` and `Sync` are now library-defined.
8779 * A [Reflect trait][reflect] was introduced, which means that
8780 downcasting via the `Any` trait is effectively limited to concrete
8781 types. This helps retain the potentially-important "parametricity"
8782 property: generic code cannot behave differently for different type
8783 arguments except in minor ways.
8784 * The `unsafe_destructor` feature is now deprecated in favor of the
8785 [new `dropck`][dropck]. This change is a major reduction in unsafe
8791 * The `thread_local` module [has been renamed to `std::thread`][th].
8792 * The methods of `IteratorExt` [have been moved to the `Iterator`
8794 * Several traits that implement Rust's conventions for type
8795 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8796 [centralized in the `std::convert` module][con].
8797 * The `FromError` trait [was removed in favor of `From`][fe].
8798 * The basic sleep function [has moved to
8799 `std::thread::sleep_ms`][slp].
8800 * The `splitn` function now takes an `n` parameter that represents the
8801 number of items yielded by the returned iterator [instead of the
8802 number of 'splits'][spl].
8803 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8804 * [Derived implementations of `PartialOrd` now order enums according
8805 to their explicitly-assigned discriminants][po].
8806 * [Methods for searching strings are generic over `Pattern`s][pat],
8807 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8809 * [In method resolution, object methods are resolved before inherent
8811 * [`String::from_str` has been deprecated in favor of the `From` impl,
8812 `String::from`][sf].
8813 * [`io::Error` implements `Sync`][ios].
8814 * [The `words` method on `&str` has been replaced with
8815 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8817 * The new path and IO modules are complete and `#[stable]`. This
8818 was the major library focus for this cycle.
8819 * The path API was [revised][path-normalize] to normalize `.`,
8820 adjusting the tradeoffs in favor of the most common usage.
8821 * A large number of remaining APIs in `std` were also stabilized
8822 during this cycle; about 75% of the non-deprecated API surface
8824 * The new [string pattern API][string-pattern] landed, which makes
8825 the string slice API much more internally consistent and flexible.
8826 * A new set of [generic conversion traits][conversion] replaced
8827 many existing ad hoc traits.
8828 * Generic numeric traits were [completely removed][num-traits]. This
8829 was made possible thanks to inherent methods for primitive types,
8830 and the removal gives maximal flexibility for designing a numeric
8831 hierarchy in the future.
8832 * The `Fn` traits are now related via [inheritance][fn-inherit]
8833 and provide ergonomic [blanket implementations][fn-blanket].
8834 * The `Index` and `IndexMut` traits were changed to
8835 [take the index by value][index-value], enabling code like
8836 `hash_map["string"]` to work.
8837 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8838 `Copy` data is known to be `Clone` as well.
8843 * Many errors now have extended explanations that can be accessed with
8844 the `--explain` flag to `rustc`.
8845 * Many new examples have been added to the standard library
8847 * rustdoc has received a number of improvements focused on completion
8849 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8850 * Much headway was made on ecosystem-wide CI, making it possible
8851 to [compare builds for breakage][ci-compare].
8854 [crates.io]: http://crates.io
8855 [clo]: https://github.com/rust-lang/rust/pull/24034
8856 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8857 [con]: https://github.com/rust-lang/rust/pull/23875
8858 [cr]: https://github.com/rust-lang/rust/pull/23419
8859 [fe]: https://github.com/rust-lang/rust/pull/23879
8860 [ie]: https://github.com/rust-lang/rust/pull/23300
8861 [inv]: https://github.com/rust-lang/rust/pull/23938
8862 [ios]: https://github.com/rust-lang/rust/pull/24133
8863 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8864 [lt]: https://github.com/rust-lang/rust/pull/24057
8865 [meth]: https://github.com/rust-lang/rust/pull/24056
8866 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8867 [po]: https://github.com/rust-lang/rust/pull/24270
8868 [sf]: https://github.com/rust-lang/rust/pull/24517
8869 [slp]: https://github.com/rust-lang/rust/pull/23949
8870 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8871 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8872 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8873 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8874 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8875 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8876 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8877 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8878 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8879 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8880 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8881 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8882 [reflect]: https://github.com/rust-lang/rust/pull/23712
8883 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8884 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8885 [index-value]: https://github.com/rust-lang/rust/pull/23601
8886 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8887 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8888 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8889 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8890 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8891 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8894 Version 1.0.0-alpha.2 (2015-02-20)
8895 =====================================
8897 * ~1300 changes, numerous bugfixes
8901 * The various I/O modules were [overhauled][io-rfc] to reduce
8902 unnecessary abstractions and provide better interoperation with
8903 the underlying platform. The old `io` module remains temporarily
8905 * The standard library now [participates in feature gating][feat],
8906 so use of unstable libraries now requires a `#![feature(...)]`
8907 attribute. The impact of this change is [described on the
8908 forum][feat-forum]. [RFC][feat-rfc].
8912 * `for` loops [now operate on the `IntoIterator` trait][into],
8913 which eliminates the need to call `.iter()`, etc. to iterate
8914 over collections. There are some new subtleties to remember
8915 though regarding what sort of iterators various types yield, in
8916 particular that `for foo in bar { }` yields values from a move
8917 iterator, destroying the original collection. [RFC][into-rfc].
8918 * Objects now have [default lifetime bounds][obj], so you don't
8919 have to write `Box<Trait+'static>` when you don't care about
8920 storing references. [RFC][obj-rfc].
8921 * In types that implement `Drop`, [lifetimes must outlive the
8922 value][drop]. This will soon make it possible to safely
8923 implement `Drop` for types where `#[unsafe_destructor]` is now
8924 required. Read the [gorgeous RFC][drop-rfc] for details.
8925 * The fully qualified <T as Trait>::X syntax lets you set the Self
8926 type for a trait method or associated type. [RFC][ufcs-rfc].
8927 * References to types that implement `Deref<U>` now [automatically
8928 coerce to references][deref] to the dereferenced type `U`,
8929 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8930 should eliminate many unsightly uses of `&*`, as when converting
8931 from references to vectors into references to
8932 slices. [RFC][deref-rfc].
8933 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8934 `|:|`) is obsolete and closure kind is inferred from context.
8935 * [`Self` is a keyword][Self].
8939 * The `Show` and `String` formatting traits [have been
8940 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8941 their related purposes. Automatically getting a string
8942 conversion to use with `format!("{:?}", something_to_debug)` is
8943 now written `#[derive(Debug)]`.
8944 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8945 OsStr}`, provide strings in platform-specific encodings for easier
8946 interop with system APIs. [RFC][osstr-rfc].
8947 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8948 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8949 creating raw pointers.
8953 * Certain long error messages of the form 'expected foo found bar'
8954 are now [split neatly across multiple
8955 lines][multiline]. Examples in the PR.
8956 * On Unix Rust can be [uninstalled][un] by running
8957 `/usr/local/lib/rustlib/uninstall.sh`.
8958 * The `#[rustc_on_unimplemented]` attribute, requiring the
8959 'on_unimplemented' feature, lets rustc [display custom error
8960 messages when a trait is expected to be implemented for a type
8965 * Rust is tested against a [LALR grammar][lalr], which parses
8966 almost all the Rust files that rustc does.
8968 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8969 [close]: https://github.com/rust-lang/rust/pull/21843
8970 [deref]: https://github.com/rust-lang/rust/pull/21351
8971 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8972 [drop]: https://github.com/rust-lang/rust/pull/21972
8973 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8974 [feat]: https://github.com/rust-lang/rust/pull/21248
8975 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8976 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8977 [fmt]: https://github.com/rust-lang/rust/pull/21457
8978 [into]: https://github.com/rust-lang/rust/pull/20790
8979 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8980 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8981 [lalr]: https://github.com/rust-lang/rust/pull/21452
8982 [multiline]: https://github.com/rust-lang/rust/pull/19870
8983 [obj]: https://github.com/rust-lang/rust/pull/22230
8984 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8985 [onun]: https://github.com/rust-lang/rust/pull/20889
8986 [osstr]: https://github.com/rust-lang/rust/pull/21488
8987 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8988 [Self]: https://github.com/rust-lang/rust/pull/22158
8989 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8990 [un]: https://github.com/rust-lang/rust/pull/22256
8993 Version 1.0.0-alpha (2015-01-09)
8994 ==================================
8996 * ~2400 changes, numerous bugfixes
9000 * The language itself is considered feature complete for 1.0,
9001 though there will be many usability improvements and bugfixes
9002 before the final release.
9003 * Nearly 50% of the public API surface of the standard library has
9004 been declared 'stable'. Those interfaces are unlikely to change
9006 * The long-running debate over integer types has been
9007 [settled][ints]: Rust will ship with types named `isize` and
9008 `usize`, rather than `int` and `uint`, for pointer-sized
9009 integers. Guidelines will be rolled out during the alpha cycle.
9010 * Most crates that are not `std` have been moved out of the Rust
9011 distribution into the Cargo ecosystem so they can evolve
9012 separately and don't need to be stabilized as quickly, including
9013 'time', 'getopts', 'num', 'regex', and 'term'.
9014 * Documentation continues to be expanded with more API coverage, more
9015 examples, and more in-depth explanations. The guides have been
9016 consolidated into [The Rust Programming Language][trpl].
9017 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9018 * All official Rust binary installers now come with [Cargo], the
9019 Rust package manager.
9023 * Closures have been [completely redesigned][unboxed] to be
9024 implemented in terms of traits, can now be used as generic type
9025 bounds and thus monomorphized and inlined, or via an opaque
9026 pointer (boxed) as in the old system. The new system is often
9027 referred to as 'unboxed' closures.
9028 * Traits now support [associated types][assoc], allowing families
9029 of related types to be defined together and used generically in
9031 * Enum variants are [namespaced by their type names][enum].
9032 * [`where` clauses][where] provide a more versatile and attractive
9033 syntax for specifying generic bounds, though the previous syntax
9035 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9037 * Rust [no longer has a runtime][rt] of any description, and only
9038 supports OS threads, not green threads.
9039 * At long last, Rust has been overhauled for 'dynamically-sized
9040 types' ([DST]), which integrates 'fat pointers' (object types,
9041 arrays, and `str`) more deeply into the type system, making it
9043 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9044 `..j` that produce range types and which, when combined with the
9045 `Index` operator and multidispatch, leads to a convenient slice
9047 * The new range syntax revealed an ambiguity in the fixed-length
9048 array syntax, so now fixed length arrays [are written `[T;
9050 * The `Copy` trait is no longer implemented automatically. Unsafe
9051 pointers no longer implement `Sync` and `Send` so types
9052 containing them don't automatically either. `Sync` and `Send`
9053 are now 'unsafe traits' so one can "forcibly" implement them via
9054 `unsafe impl` if a type confirms to the requirements for them
9055 even though the internals do not (e.g. structs containing unsafe
9056 pointers like `Arc`). These changes are intended to prevent some
9057 footguns and are collectively known as [opt-in built-in
9058 traits][oibit] (though `Sync` and `Send` will soon become pure
9059 library types unknown to the compiler).
9060 * Operator traits now take their operands [by value][ops], and
9061 comparison traits can use multidispatch to compare one type
9062 against multiple other types, allowing e.g. `String` to be
9063 compared with `&str`.
9064 * `if let` and `while let` are no longer feature-gated.
9065 * Rust has adopted a more [uniform syntax for escaping unicode
9066 characters][unicode].
9067 * `macro_rules!` [has been declared stable][mac]. Though it is a
9068 flawed system it is sufficiently popular that it must be usable
9069 for 1.0. Effort has gone into [future-proofing][mac-future] it
9070 in ways that will allow other macro systems to be developed in
9071 parallel, and won't otherwise impact the evolution of the
9073 * The prelude has been [pared back significantly][prelude] such
9074 that it is the minimum necessary to support the most pervasive
9075 code patterns, and through [generalized where clauses][where]
9076 many of the prelude extension traits have been consolidated.
9077 * Rust's rudimentary reflection [has been removed][refl], as it
9078 incurred too much code generation for little benefit.
9079 * [Struct variants][structvars] are no longer feature-gated.
9080 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9081 known as 'higher-ranked trait bounds', this crucially allows
9082 unboxed closures to work.
9083 * Macros invocations surrounded by parens or square brackets and
9084 not terminated by a semicolon are [parsed as
9085 expressions][macros], which makes expressions like `vec![1i32,
9086 2, 3].len()` work as expected.
9087 * Trait objects now implement their traits automatically, and
9088 traits that can be coerced to objects now must be [object
9090 * Automatically deriving traits is now done with `#[derive(...)]`
9091 not `#[deriving(...)]` for [consistency with other naming
9092 conventions][derive].
9093 * Importing the containing module or enum at the same time as
9094 items or variants they contain is [now done with `self` instead
9095 of `mod`][self], as in use `foo::{self, bar}`
9096 * Glob imports are no longer feature-gated.
9097 * The `box` operator and `box` patterns have been feature-gated
9098 pending a redesign. For now unique boxes should be allocated
9099 like other containers, with `Box::new`.
9103 * A [series][coll1] of [efforts][coll2] to establish
9104 [conventions][coll3] for collections types has resulted in API
9105 improvements throughout the standard library.
9106 * New [APIs for error handling][err] provide ergonomic interop
9107 between error types, and [new conventions][err-conv] describe
9108 more clearly the recommended error handling strategies in Rust.
9109 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9110 it is easier to discuss failure in the context of error handling
9111 without making clarifications as to whether you are referring to
9112 the 'fail' macro or failure more generally.
9113 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9114 syscall when available.
9115 * The 'serialize' crate has been renamed 'rustc-serialize' and
9116 moved out of the distribution to Cargo. Although it is widely
9117 used now, it is expected to be superseded in the near future.
9118 * The `Show` formatter, typically implemented with
9119 `#[derive(Show)]` is [now requested with the `{:?}`
9120 specifier][show] and is intended for use by all types, for uses
9121 such as `println!` debugging. The new `String` formatter must be
9122 implemented by hand, uses the `{}` specifier, and is intended
9123 for full-fidelity conversions of things that can logically be
9124 represented as strings.
9128 * [Flexible target specification][flex] allows rustc's code
9129 generation to be configured to support otherwise-unsupported
9131 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9132 respective debuggers with Rust-appropriate pretty-printing.
9133 * The Windows installation of Rust is distributed with the
9134 MinGW components currently required to link binaries on that
9139 * Nullable enum optimizations have been extended to more types so
9140 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9141 space than the inner types themselves.
9142 * Work has begun on supporting AArch64.
9144 [Cargo]: https://crates.io
9145 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9146 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9147 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9148 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9149 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9150 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9151 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9152 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9153 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9154 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9155 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9156 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9157 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9158 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9159 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9160 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9161 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9162 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9163 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9164 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9165 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9166 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9167 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9168 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9169 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9170 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9171 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9172 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9173 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9174 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9175 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9176 [trpl]: https://doc.rust-lang.org/book/index.html
9177 [rbe]: http://rustbyexample.com/
9180 Version 0.12.0 (2014-10-09)
9181 =============================
9183 * ~1900 changes, numerous bugfixes
9187 * The introductory documentation (now called The Rust Guide) has
9188 been completely rewritten, as have a number of supplementary
9190 * Rust's package manager, Cargo, continues to improve and is
9191 sometimes considered to be quite awesome.
9192 * Many API's in `std` have been reviewed and updated for
9193 consistency with the in-development Rust coding
9194 guidelines. The standard library documentation tracks
9195 stabilization progress.
9196 * Minor libraries have been moved out-of-tree to the rust-lang org
9197 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9198 be installed with Cargo.
9199 * Lifetime elision allows lifetime annotations to be left off of
9200 function declarations in many common scenarios.
9201 * Rust now works on 64-bit Windows.
9204 * Indexing can be overloaded with the `Index` and `IndexMut`
9206 * The `if let` construct takes a branch only if the `let` pattern
9207 matches, currently behind the 'if_let' feature gate.
9208 * 'where clauses', a more flexible syntax for specifying trait
9209 bounds that is more aesthetic, have been added for traits and
9210 free functions. Where clauses will in the future make it
9211 possible to constrain associated types, which would be
9212 impossible with the existing syntax.
9213 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9214 the 'slicing_syntax' feature gate, and can be overloaded with
9215 the `Slice` or `SliceMut` traits.
9216 * The syntax for matching of sub-slices has been changed to use a
9217 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9218 consistency with other uses of `..` and to future-proof
9219 potential additional uses of the syntax.
9220 * The syntax for matching inclusive ranges in patterns has changed
9221 from `0..3` to `0...4` to be consistent with the exclusive range
9223 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9224 c]`) has been put behind the 'advanced_slice_patterns' feature
9225 gate and may be removed in the future.
9226 * Components of tuples and tuple structs can be extracted using
9227 the `value.0` syntax, currently behind the `tuple_indexing`
9229 * The `#[crate_id]` attribute is no longer supported; versioning
9230 is handled by the package manager.
9231 * Renaming crate imports are now written `extern crate foo as bar`
9232 instead of `extern crate bar = foo`.
9233 * Renaming use statements are now written `use foo as bar` instead
9235 * `let` and `match` bindings and argument names in macros are now
9237 * The new, more efficient, closure types ('unboxed closures') have
9238 been added under a feature gate, 'unboxed_closures'. These will
9239 soon replace the existing closure types, once higher-ranked
9240 trait lifetimes are added to the language.
9241 * `move` has been added as a keyword, for indicating closures
9242 that capture by value.
9243 * Mutation and assignment is no longer allowed in pattern guards.
9244 * Generic structs and enums can now have trait bounds.
9245 * The `Share` trait is now called `Sync` to free up the term
9246 'shared' to refer to 'shared reference' (the default reference
9248 * Dynamically-sized types have been mostly implemented,
9249 unifying the behavior of fat-pointer types with the rest of the
9251 * As part of dynamically-sized types, the `Sized` trait has been
9252 introduced, which qualifying types implement by default, and
9253 which type parameters expect by default. To specify that a type
9254 parameter does not need to be sized, write `<Sized? T>`. Most
9255 types are `Sized`, notable exceptions being unsized arrays
9256 (`[T]`) and trait types.
9257 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9258 * Lifetime bounds can now be applied to type parameters and object
9260 * The old, reference counted GC type, `Gc<T>` which was once
9261 denoted by the `@` sigil, has finally been removed. GC will be
9262 revisited in the future.
9265 * Library documentation has been improved for a number of modules.
9266 * Bit-vectors, collections::bitv has been modernized.
9267 * The url crate is deprecated in favor of
9268 http://github.com/servo/rust-url, which can be installed with
9270 * Most I/O stream types can be cloned and subsequently closed from
9272 * A `std::time::Duration` type has been added for use in I/O
9273 methods that rely on timers, as well as in the 'time' crate's
9274 `Timespec` arithmetic.
9275 * The runtime I/O abstraction layer that enabled the green thread
9276 scheduler to do non-thread-blocking I/O has been removed, along
9277 with the libuv-based implementation employed by the green thread
9278 scheduler. This will greatly simplify the future I/O work.
9279 * `collections::btree` has been rewritten to have a more
9280 idiomatic and efficient design.
9283 * rustdoc output now indicates the stability levels of API's.
9284 * The `--crate-name` flag can specify the name of the crate
9285 being compiled, like `#[crate_name]`.
9286 * The `-C metadata` specifies additional metadata to hash into
9287 symbol names, and `-C extra-filename` specifies additional
9288 information to put into the output filename, for use by the
9289 package manager for versioning.
9290 * debug info generation has continued to improve and should be
9291 more reliable under both gdb and lldb.
9292 * rustc has experimental support for compiling in parallel
9293 using the `-C codegen-units` flag.
9294 * rustc no longer encodes rpath information into binaries by
9298 * Stack usage has been optimized with LLVM lifetime annotations.
9299 * Official Rust binaries on Linux are more compatible with older
9300 kernels and distributions, built on CentOS 5.10.
9303 Version 0.11.0 (2014-07-02)
9304 ==========================
9306 * ~1700 changes, numerous bugfixes
9309 * ~[T] has been removed from the language. This type is superseded by
9311 * ~str has been removed from the language. This type is superseded by
9313 * ~T has been removed from the language. This type is superseded by the
9315 * @T has been removed from the language. This type is superseded by the
9316 standard library's std::gc::Gc<T> type.
9317 * Struct fields are now all private by default.
9318 * Vector indices and shift amounts are both required to be a `uint`
9319 instead of any integral type.
9320 * Byte character, byte string, and raw byte string literals are now all
9321 supported by prefixing the normal literal with a `b`.
9322 * Multiple ABIs are no longer allowed in an ABI string
9323 * The syntax for lifetimes on closures/procedures has been tweaked
9324 slightly: `<'a>|A, B|: 'b + K -> T`
9325 * Floating point modulus has been removed from the language; however it
9326 is still provided by a library implementation.
9327 * Private enum variants are now disallowed.
9328 * The `priv` keyword has been removed from the language.
9329 * A closure can no longer be invoked through a &-pointer.
9330 * The `use foo, bar, baz;` syntax has been removed from the language.
9331 * The transmute intrinsic no longer works on type parameters.
9332 * Statics now allow blocks/items in their definition.
9333 * Trait bounds are separated from objects with + instead of : now.
9334 * Objects can no longer be read while they are mutably borrowed.
9335 * The address of a static is now marked as insignificant unless the
9336 #[inline(never)] attribute is placed it.
9337 * The #[unsafe_destructor] attribute is now behind a feature gate.
9338 * Struct literals are no longer allowed in ambiguous positions such as
9339 if, while, match, and for..in.
9340 * Declaration of lang items and intrinsics are now feature-gated by
9342 * Integral literals no longer default to `int`, and floating point
9343 literals no longer default to `f64`. Literals must be suffixed with an
9344 appropriate type if inference cannot determine the type of the
9346 * The Box<T> type is no longer implicitly borrowed to &mut T.
9347 * Procedures are now required to not capture borrowed references.
9350 * The standard library is now a "facade" over a number of underlying
9351 libraries. This means that development on the standard library should
9352 be speedier due to smaller crates, as well as a clearer line between
9354 * A new library, libcore, lives under the standard library's facade
9355 which is Rust's "0-assumption" library, suitable for embedded and
9356 kernel development for example.
9357 * A regex crate has been added to the standard distribution. This crate
9358 includes statically compiled regular expressions.
9359 * The unwrap/unwrap_err methods on Result require a Show bound for
9360 better error messages.
9361 * The return types of the std::comm primitives have been centralized
9362 around the Result type.
9363 * A number of I/O primitives have gained the ability to time out their
9365 * A number of I/O primitives have gained the ability to close their
9366 reading/writing halves to cancel pending operations.
9367 * Reverse iterator methods have been removed in favor of `rev()` on
9368 their forward-iteration counterparts.
9369 * A bitflags! macro has been added to enable easy interop with C and
9370 management of bit flags.
9371 * A debug_assert! macro is now provided which is disabled when
9372 `--cfg ndebug` is passed to the compiler.
9373 * A graphviz crate has been added for creating .dot files.
9374 * The std::cast module has been migrated into std::mem.
9375 * The std::local_data api has been migrated from freestanding functions
9376 to being based on methods.
9377 * The Pod trait has been renamed to Copy.
9378 * jemalloc has been added as the default allocator for types.
9379 * The API for allocating memory has been changed to use proper alignment
9380 and sized deallocation
9381 * Connecting a TcpStream or binding a TcpListener is now based on a
9382 string address and a u16 port. This allows connecting to a hostname as
9384 * The Reader trait now contains a core method, read_at_least(), which
9385 correctly handles many repeated 0-length reads.
9386 * The process-spawning API is now centered around a builder-style
9388 * The :? printing qualifier has been moved from the standard library to
9389 an external libdebug crate.
9390 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9391 have been renamed to Eq/Ord.
9392 * The select/plural methods have been removed from format!. The escapes
9393 for { and } have also changed from \{ and \} to {{ and }},
9395 * The TaskBuilder API has been re-worked to be a true builder, and
9396 extension traits for spawning native/green tasks have been added.
9399 * All breaking changes to the language or libraries now have their
9400 commit message annotated with `[breaking-change]` to allow for easy
9401 discovery of breaking changes.
9402 * The compiler will now try to suggest how to annotate lifetimes if a
9403 lifetime-related error occurs.
9404 * Debug info continues to be improved greatly with general bug fixes and
9405 better support for situations like link time optimization (LTO).
9406 * Usage of syntax extensions when cross-compiling has been fixed.
9407 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9408 -fdata-sections and --gc-sections has been enabled by default
9409 * The compiler is now stricter about where it will load module files
9410 from when a module is declared via `mod foo;`.
9411 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9412 Syntax extensions are now discovered via a "plugin registrar" type
9413 which will be extended in the future to other various plugins.
9414 * Lints have been restructured to allow for dynamically loadable lints.
9415 * A number of rustdoc improvements:
9416 * The HTML output has been visually redesigned.
9417 * Markdown is now powered by hoedown instead of sundown.
9418 * Searching heuristics have been greatly improved.
9419 * The search index has been reduced in size by a great amount.
9420 * Cross-crate documentation via `pub use` has been greatly improved.
9421 * Primitive types are now hyperlinked and documented.
9422 * Documentation has been moved from static.rust-lang.org/doc to
9424 * A new sandbox, play.rust-lang.org, is available for running and
9425 sharing rust code examples on-line.
9426 * Unused attributes are now more robustly warned about.
9427 * The dead_code lint now warns about unused struct fields.
9428 * Cross-compiling to iOS is now supported.
9429 * Cross-compiling to mipsel is now supported.
9430 * Stability attributes are now inherited by default and no longer apply
9431 to intra-crate usage, only inter-crate usage.
9432 * Error message related to non-exhaustive match expressions have been
9436 Version 0.10 (2014-04-03)
9437 =========================
9439 * ~1500 changes, numerous bugfixes
9442 * A new RFC process is now in place for modifying the language.
9443 * Patterns with `@`-pointers have been removed from the language.
9444 * Patterns with unique vectors (`~[T]`) have been removed from the
9446 * Patterns with unique strings (`~str`) have been removed from the
9448 * `@str` has been removed from the language.
9449 * `@[T]` has been removed from the language.
9450 * `@self` has been removed from the language.
9451 * `@Trait` has been removed from the language.
9452 * Headers on `~` allocations which contain `@` boxes inside the type for
9453 reference counting have been removed.
9454 * The semantics around the lifetimes of temporary expressions have changed,
9455 see #3511 and #11585 for more information.
9456 * Cross-crate syntax extensions are now possible, but feature gated. See
9457 #11151 for more information. This includes both `macro_rules!` macros as
9458 well as syntax extensions such as `format!`.
9459 * New lint modes have been added, and older ones have been turned on to be
9461 * Unnecessary parentheses
9464 * Uppercase variables
9465 * Publicly visible private types
9466 * `#[deriving]` with raw pointers
9467 * Unsafe functions can no longer be coerced to closures.
9468 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9469 * The `#[simd]` attribute is now behind a feature gate.
9470 * Visibility is no longer allowed on `extern crate` statements, and
9471 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9472 * Trailing commas are now allowed in argument lists and tuple patterns.
9473 * The `do` keyword has been removed, it is now a reserved keyword.
9474 * Default type parameters have been implemented, but are feature gated.
9475 * Borrowed variables through captures in closures are now considered soundly.
9476 * `extern mod` is now `extern crate`
9477 * The `Freeze` trait has been removed.
9478 * The `Share` trait has been added for types that can be shared among
9480 * Labels in macros are now hygienic.
9481 * Expression/statement macro invocations can be delimited with `{}` now.
9482 * Treatment of types allowed in `static mut` locations has been tweaked.
9483 * The `*` and `.` operators are now overloadable through the `Deref` and
9485 * `~Trait` and `proc` no longer have `Send` bounds by default.
9486 * Partial type hints are now supported with the `_` type marker.
9487 * An `Unsafe` type was introduced for interior mutability. It is now
9488 considered undefined to transmute from `&T` to `&mut T` without using the
9490 * The #[linkage] attribute was implemented for extern statics/functions.
9491 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9492 * `Pod` was renamed to `Copy`.
9495 * The `libextra` library has been removed. It has now been decomposed into
9496 component libraries with smaller and more focused nuggets of
9497 functionality. The full list of libraries can be found on the
9498 documentation index page.
9499 * std: `std::condition` has been removed. All I/O errors are now propagated
9500 through the `Result` type. In order to assist with error handling, a
9501 `try!` macro for unwrapping errors with an early return and a lint for
9502 unused results has been added. See #12039 for more information.
9503 * std: The `vec` module has been renamed to `slice`.
9504 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9505 This will become the only growable vector in the future.
9506 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9507 are now found at `std::io::BufferedReader` instead of
9508 `std::io::buffered::BufferedReader`.
9509 * std: `print` and `println` are no longer in the prelude, the `print!` and
9510 `println!` macros are intended to be used instead.
9511 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9512 attempts to statically prevent cycles.
9513 * std: The standard distribution is adopting the policy of pushing failure
9514 to the user rather than failing in libraries. Many functions (such as
9515 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9516 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9517 deriving mode: `#[deriving(Show)]`.
9518 * std: `ToStr` is now implemented for all types implementing `Show`.
9519 * std: The formatting trait methods now take `&self` instead of `&T`
9520 * std: The `invert()` method on iterators has been renamed to `rev()`
9521 * std: `std::num` has seen a reduction in the genericity of its traits,
9522 consolidating functionality into a few core traits.
9523 * std: Backtraces are now printed on task failure if the environment
9524 variable `RUST_BACKTRACE` is present.
9525 * std: Naming conventions for iterators have been standardized. More details
9526 can be found on the wiki's style guide.
9527 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9528 still implement the function.
9529 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9530 * std: `assert_approx_eq!` has been removed
9531 * std: The `e` and `E` formatting specifiers for floats have been added to
9532 print them in exponential notation.
9533 * std: The `Times` trait has been removed
9534 * std: Indications of variance and opting out of builtin bounds is done
9535 through marker types in `std::kinds::marker` now
9536 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9537 `#[deriving(Hash)]` is now possible.
9538 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9539 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9540 * std: `Chan::new` is now `channel()`.
9541 * std: A new synchronous channel type has been implemented.
9542 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9543 * std: `hashmap` and `trie` have been moved to `libcollections`
9544 * std: `run` has been rolled into `io::process`
9545 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9546 * std: The equality and comparison traits have seen some reorganization.
9547 * std: `rand` has moved to `librand`.
9548 * std: `to_{lower,upper}case` has been implemented for `char`.
9549 * std: Logging has been moved to `liblog`.
9550 * collections: `HashMap` has been rewritten for higher performance and less
9552 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9553 it can be booted manually. The runtime guide has more information and
9555 * native: All I/O functionality except signals has been implemented.
9556 * green: Task spawning with `libgreen` has been optimized with stack caching
9557 and various trimming of code.
9558 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9559 * sync: The `extra::sync` module has been updated to modern rust (and moved
9560 to the `sync` library), tweaking and improving various interfaces while
9561 dropping redundant functionality.
9562 * sync: A new `Barrier` type has been added to the `sync` library.
9563 * sync: An efficient mutex for native and green tasks has been implemented.
9564 * serialize: The `base64` module has seen some improvement. It treats
9565 newlines better, has non-string error values, and has seen general
9567 * fourcc: A `fourcc!` macro was introduced
9568 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9569 hexadecimal literal.
9572 * `rustpkg` has been deprecated and removed from the main repository. Its
9573 replacement, `cargo`, is under development.
9574 * Nightly builds of rust are now available
9575 * The memory usage of rustc has been improved many times throughout this
9577 * The build process supports disabling rpath support for the rustc binary
9579 * Code generation has improved in some cases, giving more information to the
9580 LLVM optimization passes to enable more extensive optimizations.
9581 * Debuginfo compatibility with lldb on OSX has been restored.
9582 * The master branch is now gated on an android bot, making building for
9583 android much more reliable.
9584 * Output flags have been centralized into one `--emit` flag.
9585 * Crate type flags have been centralized into one `--crate-type` flag.
9586 * Codegen flags have been consolidated behind a `-C` flag.
9587 * Linking against outdated crates now has improved error messages.
9588 * Error messages with lifetimes will often suggest how to annotate the
9589 function to fix the error.
9590 * Many more types are documented in the standard library, and new guides
9592 * Many `rustdoc` improvements:
9593 * code blocks are syntax highlighted.
9594 * render standalone markdown files.
9595 * the --test flag tests all code blocks by default.
9596 * exported macros are displayed.
9597 * re-exported types have their documentation inlined at the location of the
9599 * search works across crates that have been rendered to the same output
9603 Version 0.9 (2014-01-09)
9604 ==========================
9606 * ~1800 changes, numerous bugfixes
9609 * The `float` type has been removed. Use `f32` or `f64` instead.
9610 * A new facility for enabling experimental features (feature gating) has
9611 been added, using the crate-level `#[feature(foo)]` attribute.
9612 * Managed boxes (@) are now behind a feature gate
9613 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9614 standard library's `Gc` or `Rc` types instead.
9615 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9616 * Jumping back to the top of a loop is now done with `continue` instead of
9618 * Strings can no longer be mutated through index assignment.
9619 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9620 hash delimiters, as in `r###"foo"###`.
9621 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9623 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9624 * `@fn`s have been removed.
9625 * `do` only works with procs in order to make it obvious what the cost
9627 * Single-element tuple-like structs can no longer be dereferenced to
9628 obtain the inner value. A more comprehensive solution for overloading
9629 the dereference operator will be provided in the future.
9630 * The `#[link(...)]` attribute has been replaced with
9631 `#[crate_id = "name#vers"]`.
9632 * Empty `impl`s must be terminated with empty braces and may not be
9633 terminated with a semicolon.
9634 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9635 no longer has any special meaning.
9636 * The old `fmt!` string formatting macro has been removed.
9637 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9638 `print!` and `println!`.
9639 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9640 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9641 `extern mod foo = "bar"` instead.
9642 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9643 * Macros can have attributes.
9644 * Macros can expand to items with attributes.
9645 * Macros can expand to multiple items.
9646 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9647 * Comments may be nested.
9648 * Values automatically coerce to trait objects they implement, without
9650 * Enum discriminants are no longer an entire word but as small as needed to
9651 contain all the variants. The `repr` attribute can be used to override
9652 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9653 `#[repr(C)]` to match C enums.
9654 * Non-string literals are not allowed in attributes (they never worked).
9655 * The FFI now supports variadic functions.
9656 * Octal numeric literals, as in `0o7777`.
9657 * The `concat!` syntax extension performs compile-time string concatenation.
9658 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9659 removed as Rust no longer uses segmented stacks.
9660 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9661 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9662 not `*`; ignoring remaining fields of a struct is also done with `..`,
9663 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9664 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9665 * `rustc` supports the "system" calling convention, which defaults to the
9666 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9668 * The `type_overflow` lint (default: warn) checks literals for overflow.
9669 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9670 * The `attribute_usage` lint (default: warn) warns about unknown
9672 * The `unknown_features` lint (default: warn) warns about unknown
9674 * The `dead_code` lint (default: warn) checks for dead code.
9675 * Rust libraries can be linked statically to one another
9676 * `#[link_args]` is behind the `link_args` feature gate.
9677 * Native libraries are now linked with `#[link(name = "foo")]`
9678 * Native libraries can be statically linked to a rust crate
9679 (`#[link(name = "foo", kind = "static")]`).
9680 * Native OS X frameworks are now officially supported
9681 (`#[link(name = "foo", kind = "framework")]`).
9682 * The `#[thread_local]` attribute creates thread-local (not task-local)
9683 variables. Currently behind the `thread_local` feature gate.
9684 * The `return` keyword may be used in closures.
9685 * Types that can be copied via a memcpy implement the `Pod` kind.
9686 * The `cfg` attribute can now be used on struct fields and enum variants.
9689 * std: The `option` and `result` API's have been overhauled to make them
9690 simpler, more consistent, and more composable.
9691 * std: The entire `std::io` module has been replaced with one that is
9692 more comprehensive and that properly interfaces with the underlying
9693 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9695 * std: `io::util` contains a number of useful implementations of
9696 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9697 `ZeroReader`, `TeeReader`.
9698 * std: The reference counted pointer type `extra::rc` moved into std.
9699 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9700 just a wrapper around it).
9701 * std: The `Either` type has been removed.
9702 * std: `fmt::Default` can be implemented for any type to provide default
9703 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9704 * std: The `rand` API continues to be tweaked.
9705 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9706 on failure in gdb, is now named `rust_fail`.
9707 * std: The `each_key` and `each_value` methods on `HashMap` have been
9708 replaced by the `keys` and `values` iterators.
9709 * std: Functions dealing with type size and alignment have moved from the
9710 `sys` module to the `mem` module.
9711 * std: The `path` module was written and API changed.
9712 * std: `str::from_utf8` has been changed to cast instead of allocate.
9713 * std: `starts_with` and `ends_with` methods added to vectors via the
9714 `ImmutableEqVector` trait, which is in the prelude.
9715 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9716 if the index is out of bounds.
9717 * std: Task failure no longer propagates between tasks, as the model was
9718 complex, expensive, and incompatible with thread-based tasks.
9719 * std: The `Any` type can be used for dynamic typing.
9720 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9722 * std: Methods that produce iterators generally do not have an `_iter`
9724 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9725 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9726 * std: `util::ignore` renamed to `prelude::drop`.
9727 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9729 * std: `vec::raw` has seen a lot of cleanup and API changes.
9730 * std: The standard library no longer includes any C++ code, and very
9731 minimal C, eliminating the dependency on libstdc++.
9732 * std: Runtime scheduling and I/O functionality has been factored out into
9733 extensible interfaces and is now implemented by two different crates:
9734 libnative, for native threading and I/O; and libgreen, for green threading
9735 and I/O. This paves the way for using the standard library in more limited
9736 embedded environments.
9737 * std: The `comm` module has been rewritten to be much faster, have a
9738 simpler, more consistent API, and to work for both native and green
9740 * std: All libuv dependencies have been moved into the rustuv crate.
9741 * native: New implementations of runtime scheduling on top of OS threads.
9742 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9744 * green: The green thread scheduler and message passing types are almost
9746 * extra: The `flatpipes` module had bitrotted and was removed.
9747 * extra: All crypto functions have been removed and Rust now has a policy of
9748 not reimplementing crypto in the standard library. In the future crypto
9749 will be provided by external crates with bindings to established libraries.
9750 * extra: `c_vec` has been modernized.
9751 * extra: The `sort` module has been removed. Use the `sort` method on
9755 * The `rust` and `rusti` commands have been removed, due to lack of
9757 * `rustdoc` was completely rewritten.
9758 * `rustdoc` can test code examples in documentation.
9759 * `rustpkg` can test packages with the argument, 'test'.
9760 * `rustpkg` supports arbitrary dependencies, including C libraries.
9761 * `rustc`'s support for generating debug info is improved again.
9762 * `rustc` has better error reporting for unbalanced delimiters.
9763 * `rustc`'s JIT support was removed due to bitrot.
9764 * Executables and static libraries can be built with LTO (-Z lto)
9765 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9769 Version 0.8 (2013-09-26)
9770 ============================
9772 * ~2200 changes, numerous bugfixes
9775 * The `for` loop syntax has changed to work with the `Iterator` trait.
9776 * At long last, unwinding works on Windows.
9777 * Default methods are ready for use.
9778 * Many trait inheritance bugs fixed.
9779 * Owned and borrowed trait objects work more reliably.
9780 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9781 * rustc can omit emission of code for the `debug!` macro if it is passed
9783 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9784 for foo.rs, then foo/mod.rs, and will generate an error when both are
9786 * Strings no longer contain trailing nulls. The new `std::c_str` module
9787 provides new mechanisms for converting to C strings.
9788 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9789 * The FFI has been overhauled such that foreign functions are called directly,
9790 instead of through a stack-switching wrapper.
9791 * Calling a foreign function must be done through a Rust function with the
9792 `#[fixed_stack_segment]` attribute.
9793 * The `externfn!` macro can be used to declare both a foreign function and
9794 a `#[fixed_stack_segment]` wrapper at once.
9795 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9796 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9797 * `priv` is disallowed everywhere except for struct fields and enum variants.
9798 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9799 * `ref` bindings in irrefutable patterns work correctly now.
9800 * `char` is now prevented from containing invalid code points.
9801 * Casting to `bool` is no longer allowed.
9802 * `\0` is now accepted as an escape in chars and strings.
9803 * `yield` is a reserved keyword.
9804 * `typeof` is a reserved keyword.
9805 * Crates may be imported by URL with `extern mod foo = "url";`.
9806 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9807 * Static vectors can be initialized with repeating elements,
9808 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9809 * Static structs can be initialized with functional record update,
9810 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9811 * `cfg!` can be used to conditionally execute code based on the crate
9812 configuration, similarly to `#[cfg(...)]`.
9813 * The `unnecessary_qualification` lint detects unneeded module
9814 prefixes (default: allow).
9815 * Arithmetic operations have been implemented on the SIMD types in
9816 `std::unstable::simd`.
9817 * Exchange allocation headers were removed, reducing memory usage.
9818 * `format!` implements a completely new, extensible, and higher-performance
9819 string formatting system. It will replace `fmt!`.
9820 * `print!` and `println!` write formatted strings (using the `format!`
9821 extension) to stdout.
9822 * `write!` and `writeln!` write formatted strings (using the `format!`
9823 extension) to the new Writers in `std::rt::io`.
9824 * The library section in which a function or static is placed may
9825 be specified with `#[link_section = "..."]`.
9826 * The `proto!` syntax extension for defining bounded message protocols
9828 * `macro_rules!` is hygienic for `let` declarations.
9829 * The `#[export_name]` attribute specifies the name of a symbol.
9830 * `unreachable!` can be used to indicate unreachable code, and fails
9834 * std: Transitioned to the new runtime, written in Rust.
9835 * std: Added an experimental I/O library, `rt::io`, based on the new
9837 * std: A new generic `range` function was added to the prelude, replacing
9838 `uint::range` and friends.
9839 * std: `range_rev` no longer exists. Since range is an iterator it can be
9840 reversed with `range(lo, hi).invert()`.
9841 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9842 renamed to `unwrap_or`.
9843 * std: The `iterator` module was renamed to `iter`.
9844 * std: Integral types now support the `checked_add`, `checked_sub`, and
9845 `checked_mul` operations for detecting overflow.
9846 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9848 * std: Methods are standardizing on conventions for casting methods:
9849 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9851 * std: The `CString` type in `c_str` provides new ways to convert to and
9853 * std: `DoubleEndedIterator` can yield elements in two directions.
9854 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9856 * std: `str::from_bytes` renamed to `str::from_utf8`.
9857 * std: `pop_opt` and `shift_opt` methods added to vectors.
9858 * std: The task-local data interface no longer uses @, and keys are
9859 no longer function pointers.
9860 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9861 * std: Added `SharedPort` to `comm`.
9862 * std: `Eq` has a default method for `ne`; only `eq` is required
9864 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9865 is required in implementations.
9866 * std: `is_utf8` performance is improved, impacting many string functions.
9867 * std: `os::MemoryMap` provides cross-platform mmap.
9868 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9869 are not 'in-bounds' are considered undefined.
9870 * std: Many freestanding functions in `vec` removed in favor of methods.
9871 * std: Many freestanding functions on scalar types removed in favor of
9873 * std: Many options to task builders were removed since they don't make
9874 sense in the new scheduler design.
9875 * std: More containers implement `FromIterator` so can be created by the
9877 * std: More complete atomic types in `unstable::atomics`.
9878 * std: `comm::PortSet` removed.
9879 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9880 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9881 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9882 default implementations.
9883 * std: Various `from_str` functions were removed in favor of a generic
9884 `from_str` which is available in the prelude.
9885 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9886 * extra: `dlist`, the doubly-linked list was modernized.
9887 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9888 * extra: Added `glob` module, replacing `std::os::glob`.
9889 * extra: `rope` was removed.
9890 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9891 * extra: `net`, and `timer` were removed. The experimental replacements
9892 are `std::rt::io::net` and `std::rt::io::timer`.
9893 * extra: Iterators implemented for `SmallIntMap`.
9894 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9895 * extra: `SmallIntSet` removed. Use `BitvSet`.
9896 * extra: Performance of JSON parsing greatly improved.
9897 * extra: `semver` updated to SemVer 2.0.0.
9898 * extra: `term` handles more terminals correctly.
9899 * extra: `dbg` module removed.
9900 * extra: `par` module removed.
9901 * extra: `future` was cleaned up, with some method renames.
9902 * extra: Most free functions in `getopts` were converted to methods.
9905 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9906 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9907 similarly to gcc's `--march` flag.
9908 * rustc's performance compiling small crates is much better.
9909 * rustpkg has received many improvements.
9910 * rustpkg supports git tags as package IDs.
9911 * rustpkg builds into target-specific directories so it can be used for
9913 * The number of concurrent test tasks is controlled by the environment
9914 variable RUST_TEST_TASKS.
9915 * The test harness can now report metrics for benchmarks.
9916 * All tools have man pages.
9917 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9918 * The runtime uses jemalloc for allocations.
9919 * Segmented stacks are temporarily disabled as part of the transition to
9920 the new runtime. Stack overflows are possible!
9921 * A new documentation backend, rustdoc_ng, is available for use. It is
9922 still invoked through the normal `rustdoc` command.
9925 Version 0.7 (2013-07-03)
9926 =======================
9928 * ~2000 changes, numerous bugfixes
9931 * `impl`s no longer accept a visibility qualifier. Put them on methods
9933 * The borrow checker has been rewritten with flow-sensitivity, fixing
9934 many bugs and inconveniences.
9935 * The `self` parameter no longer implicitly means `&'self self`,
9936 and can be explicitly marked with a lifetime.
9937 * Overloadable compound operators (`+=`, etc.) have been temporarily
9938 removed due to bugs.
9939 * The `for` loop protocol now requires `for`-iterators to return `bool`
9940 so they compose better.
9941 * The `Durable` trait is replaced with the `'static` bounds.
9942 * Trait default methods work more often.
9943 * Structs with the `#[packed]` attribute have byte alignment and
9944 no padding between fields.
9945 * Type parameters bound by `Copy` must now be copied explicitly with
9947 * It is now illegal to move out of a dereferenced unsafe pointer.
9948 * `Option<~T>` is now represented as a nullable pointer.
9949 * `@mut` does dynamic borrow checks correctly.
9950 * The `main` function is only detected at the topmost level of the crate.
9951 The `#[main]` attribute is still valid anywhere.
9952 * Struct fields may no longer be mutable. Use inherited mutability.
9953 * The `#[no_send]` attribute makes a type that would otherwise be
9955 * The `#[no_freeze]` attribute makes a type that would otherwise be
9957 * Unbounded recursion will abort the process after reaching the limit
9958 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9959 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9960 are never implicitly copyable.
9961 * `#[static_assert]` makes compile-time assertions about static bools.
9962 * At long last, 'argument modes' no longer exist.
9963 * The rarely used `use mod` statement no longer exists.
9966 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9968 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9969 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9971 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9972 and unsuffixed integer literals.
9975 * The `core` crate was renamed to `std`.
9976 * The `std` crate was renamed to `extra`.
9977 * More and improved documentation.
9978 * std: `iterator` module for external iterator objects.
9979 * Many old-style (internal, higher-order function) iterators replaced by
9980 implementations of `Iterator`.
9981 * std: Many old internal vector and string iterators,
9982 incl. `any`, `all`. removed.
9983 * std: The `finalize` method of `Drop` renamed to `drop`.
9984 * std: The `drop` method now takes `&mut self` instead of `&self`.
9985 * std: The prelude no longer re-exports any modules, only types and traits.
9986 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9987 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9988 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9989 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9990 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9991 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9992 * std: Many types implement `Clone`.
9993 * std: `path` type renamed to `Path`.
9994 * std: `mut` module and `Mut` type removed.
9995 * std: Many standalone functions removed in favor of methods and iterators
9996 in `vec`, `str`. In the future methods will also work as functions.
9997 * std: `reinterpret_cast` removed. Use `transmute`.
9998 * std: ascii string handling in `std::ascii`.
9999 * std: `Rand` is implemented for ~/@.
10000 * std: `run` module for spawning processes overhauled.
10001 * std: Various atomic types added to `unstable::atomic`.
10002 * std: Various types implement `Zero`.
10003 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10004 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10005 * std: Added `os::mkdir_recursive`.
10006 * std: Added `os::glob` function performs filesystems globs.
10007 * std: `FuzzyEq` renamed to `ApproxEq`.
10008 * std: `Map` now defines `pop` and `swap` methods.
10009 * std: `Cell` constructors converted to static methods.
10010 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10011 * extra: `flate` module moved from `std` to `extra`.
10012 * extra: `fileinput` module for iterating over a series of files.
10013 * extra: `Complex` number type and `complex` module.
10014 * extra: `Rational` number type and `rational` module.
10015 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10016 * extra: `term` uses terminfo now, is more correct.
10017 * extra: `arc` functions converted to methods.
10018 * extra: Implementation of fixed output size variations of SHA-2.
10021 * `unused_variables` lint mode for unused variables (default: warn).
10022 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10024 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10026 * `dead_assignment` lint mode for unread variables (default: warn).
10027 * `unnecessary_allocation` lint mode detects some heap allocations that are
10028 immediately borrowed so could be written without allocating (default: warn).
10029 * `missing_doc` lint mode (default: allow).
10030 * `unreachable_code` lint mode (default: warn).
10031 * The `rusti` command has been rewritten and a number of bugs addressed.
10032 * rustc outputs in color on more terminals.
10033 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10034 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10035 * Compiling with `-g` will make the binary record information about
10036 dynamic borrowcheck failures for debugging.
10037 * rustdoc has a nicer stylesheet.
10038 * Various improvements to rustdoc.
10039 * Improvements to rustpkg (see the detailed release notes).
10042 Version 0.6 (2013-04-03)
10043 ========================
10045 * ~2100 changes, numerous bugfixes
10048 * The self type parameter in traits is now spelled `Self`
10049 * The `self` parameter in trait and impl methods must now be explicitly
10050 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10051 * Static methods no longer require the `static` keyword and instead
10052 are distinguished by the lack of a `self` parameter
10053 * Replaced the `Durable` trait with the `'static` lifetime
10054 * The old closure type syntax with the trailing sigil has been
10055 removed in favor of the more consistent leading sigil
10056 * `super` is a keyword, and may be prefixed to paths
10057 * Trait bounds are separated with `+` instead of whitespace
10058 * Traits are implemented with `impl Trait for Type`
10059 instead of `impl Type: Trait`
10060 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10061 * The `export` keyword has finally been removed
10062 * The `move` keyword has been removed (see "Semantic changes")
10063 * The interior mutability qualifier on vectors, `[mut T]`, has been
10064 removed. Use `&mut [T]`, etc.
10065 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10066 * `fail` is no longer a keyword. Use `fail!()`
10067 * `assert` is no longer a keyword. Use `assert!()`
10068 * `log` is no longer a keyword. use `debug!`, etc.
10069 * 1-tuples may be represented as `(T,)`
10070 * Struct fields may no longer be `mut`. Use inherited mutability,
10071 `@mut T`, `core::mut` or `core::cell`
10072 * `extern mod { ... }` is no longer valid syntax for foreign
10073 function modules. Use extern blocks: `extern { ... }`
10074 * Newtype enums removed. Use tuple-structs.
10075 * Trait implementations no longer support visibility modifiers
10076 * Pattern matching over vectors improved and expanded
10077 * `const` renamed to `static` to correspond to lifetime name,
10078 and make room for future `static mut` unsafe mutable globals.
10079 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10080 * `Clone` implementations can be automatically generated with
10081 `#[deriving(Clone)]`
10082 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10083 instead of `foo as Bar`.
10084 * Fixed length vector types are now written as `[int, .. 3]`
10085 instead of `[int * 3]`.
10086 * Fixed length vector types can express the length as a constant
10087 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10090 * Types with owned pointers or custom destructors move by default,
10091 eliminating the `move` keyword
10092 * All foreign functions are considered unsafe
10093 * &mut is now unaliasable
10094 * Writes to borrowed @mut pointers are prevented dynamically
10096 * The name of the main function can be customized using #[main]
10097 * The default type of an inferred closure is &fn instead of @fn
10098 * `use` statements may no longer be "chained" - they cannot import
10099 identifiers imported by previous `use` statements
10100 * `use` statements are crate relative, importing from the "top"
10101 of the crate by default. Paths may be prefixed with `super::`
10102 or `self::` to change the search behavior.
10103 * Method visibility is inherited from the implementation declaration
10104 * Structural records have been removed
10105 * Many more types can be used in static items, including enums
10106 'static-lifetime pointers and vectors
10107 * Pattern matching over vectors improved and expanded
10108 * Typechecking of closure types has been overhauled to
10109 improve inference and eliminate unsoundness
10110 * Macros leave scope at the end of modules, unless that module is
10111 tagged with #[macro_escape]
10114 * Added big integers to `std::bigint`
10115 * Removed `core::oldcomm` module
10116 * Added pipe-based `core::comm` module
10117 * Numeric traits have been reorganized under `core::num`
10118 * `vec::slice` finally returns a slice
10119 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10120 * Containers reorganized around traits in `core::container`
10121 * `core::dvec` removed, `~[T]` is a drop-in replacement
10122 * `core::send_map` renamed to `core::hashmap`
10123 * `std::map` removed; replaced with `core::hashmap`
10124 * `std::treemap` reimplemented as an owned balanced tree
10125 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10126 * `core::trie` added as a fast ordered map for integer keys
10127 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10128 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10129 overload the comparison operators, whereas `TotalOrd` is used
10130 by certain container types
10133 * Replaced the 'cargo' package manager with 'rustpkg'
10134 * Added all-purpose 'rust' tool
10135 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10136 * rustc now *attempts* to offer spelling suggestions
10137 * Improved support for ARM and Android
10138 * Preliminary MIPS backend
10139 * Improved foreign function ABI implementation for x86, x86_64
10140 * Various memory usage improvements
10141 * Rust code may be embedded in foreign code under limited circumstances
10142 * Inline assembler supported by new asm!() syntax extension.
10145 Version 0.5 (2012-12-21)
10146 ===========================
10148 * ~900 changes, numerous bugfixes
10151 * Removed `<-` move operator
10152 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10153 * Removed old fixed length vector syntax - `[T]/N`
10154 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10155 * Macros may now expand to items and statements
10156 * `a.b()` is always parsed as a method call, never as a field projection
10157 * `Eq` and `IterBytes` implementations can be automatically generated
10158 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10159 * Removed the special crate language for `.rc` files
10160 * Function arguments may consist of any irrefutable pattern
10163 * `&` and `~` pointers may point to objects
10164 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10165 * Enum variants may be structs
10166 * Destructors can be added to all nominal types with the Drop trait
10167 * Structs and nullary enum variants may be constants
10168 * Values that cannot be implicitly copied are now automatically moved
10169 without writing `move` explicitly
10170 * `&T` may now be coerced to `*T`
10171 * Coercions happen in `let` statements as well as function calls
10172 * `use` statements now take crate-relative paths
10173 * The module and type namespaces have been merged so that static
10174 method names can be resolved under the trait in which they are
10177 * Improved support for language features
10178 * Trait inheritance works in many scenarios
10179 * More support for explicit self arguments in methods - `self`, `&self`
10180 `@self`, and `~self` all generally work as expected
10181 * Static methods work in more situations
10182 * Experimental: Traits may declare default methods for the implementations
10186 * New condition handling system in `core::condition`
10187 * Timsort added to `std::sort`
10188 * New priority queue, `std::priority_queue`
10189 * Pipes for serializable types, `std::flatpipes'
10190 * Serialization overhauled to be trait-based
10191 * Expanded `getopts` definitions
10192 * Moved futures to `std`
10193 * More functions are pure now
10194 * `core::comm` renamed to `oldcomm`. Still deprecated
10195 * `rustdoc` and `cargo` are libraries now
10198 * Added a preliminary REPL, `rusti`
10199 * License changed from MIT to dual MIT/APL2
10202 Version 0.4 (2012-10-15)
10203 ==========================
10205 * ~2000 changes, numerous bugfixes
10208 * All keywords are now strict and may not be used as identifiers anywhere
10209 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10210 'of', 'with', 'to', 'class'.
10211 * Classes are replaced with simpler structs
10212 * Explicit method self types
10213 * `ret` became `return` and `alt` became `match`
10214 * `import` is now `use`; `use is now `extern mod`
10215 * `extern mod { ... }` is now `extern { ... }`
10216 * `use mod` is the recommended way to import modules
10217 * `pub` and `priv` replace deprecated export lists
10218 * The syntax of `match` pattern arms now uses fat arrow (=>)
10219 * `main` no longer accepts an args vector; use `os::args` instead
10222 * Trait implementations are now coherent, ala Haskell typeclasses
10223 * Trait methods may be static
10224 * Argument modes are deprecated
10225 * Borrowed pointers are much more mature and recommended for use
10226 * Strings and vectors in the static region are stored in constant memory
10227 * Typestate was removed
10228 * Resolution rewritten to be more reliable
10229 * Support for 'dual-mode' data structures (freezing and thawing)
10232 * Most binary operators can now be overloaded via the traits in
10234 * `std::net::url` for representing URLs
10235 * Sendable hash maps in `core::send_map`
10236 * `core::task' gained a (currently unsafe) task-local storage API
10239 * An efficient new intertask communication primitive called the pipe,
10240 along with a number of higher-level channel types, in `core::pipes`
10241 * `std::arc`, an atomically reference counted, immutable, shared memory
10243 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10244 * Futures are now based on pipes and sendable
10245 * More robust linked task failure
10246 * Improved task builder API
10249 * Improved error reporting
10250 * Preliminary JIT support
10251 * Preliminary work on precise GC
10252 * Extensive architectural improvements to rustc
10253 * Begun a transition away from buggy C++-based reflection (shape) code to
10254 Rust-based (visitor) code
10255 * All hash functions and tables converted to secure, randomized SipHash
10258 Version 0.3 (2012-07-12)
10259 ========================
10261 * ~1900 changes, numerous bugfixes
10263 * New coding conveniences
10264 * Integer-literal suffix inference
10265 * Per-item control over warnings, errors
10266 * #[cfg(windows)] and #[cfg(unix)] attributes
10267 * Documentation comments
10268 * More compact closure syntax
10269 * 'do' expressions for treating higher-order functions as
10271 * *-patterns (wildcard extended to all constructor fields)
10274 * Name resolution pass and exhaustiveness checker rewritten
10275 * Region pointers and borrow checking supersede alias
10277 * Init-ness checking is now provided by a region-based liveness
10278 pass instead of the typestate pass; same for last-use analysis
10279 * Extensive work on region pointers
10281 * Experimental new language features
10282 * Slices and fixed-size, interior-allocated vectors
10283 * #!-comments for lang versioning, shell execution
10284 * Destructors and iface implementation for classes;
10285 type-parameterized classes and class methods
10286 * 'const' type kind for types that can be used to implement
10287 shared-memory concurrency patterns
10291 * Removal of various obsolete features
10292 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10293 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10295 * Constructs: do-while loops ('do' repurposed), fn binding,
10296 resources (replaced by destructors)
10298 * Compiler reorganization
10299 * Syntax-layer of compiler split into separate crate
10300 * Clang (from LLVM project) integrated into build
10301 * Typechecker split into sub-modules
10304 * New time functions
10305 * Extension methods for many built-in types
10306 * Arc: atomic-refcount read-only / exclusive-use shared cells
10307 * Par: parallel map and search routines
10308 * Extensive work on libuv interface
10309 * Much vector code moved to libraries
10310 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10311 #include, #include_str, #include_bin
10313 * Tool improvements
10314 * Cargo automatically resolves dependencies
10317 Version 0.2 (2012-03-29)
10318 =========================
10320 * >1500 changes, numerous bugfixes
10322 * New docs and doc tooling
10324 * New port: FreeBSD x86_64
10326 * Compilation model enhancements
10327 * Generics now specialized, multiply instantiated
10328 * Functions now inlined across separate crates
10330 * Scheduling, stack and threading fixes
10331 * Noticeably improved message-passing performance
10332 * Explicit schedulers
10336 * Experimental new language features
10337 * Operator overloading
10341 * Various language extensions
10342 * C-callback function types: 'crust fn ...'
10343 * Infinite-loop construct: 'loop { ... }'
10344 * Shorten 'mutable' to 'mut'
10345 * Required mutable-local qualifier: 'let mut ...'
10346 * Basic glob-exporting: 'export foo::*;'
10347 * Alt now exhaustive, 'alt check' for runtime-checked
10348 * Block-function form of 'for' loop, with 'break' and 'ret'.
10351 * AST quasi-quote syntax extension
10352 * Revived libuv interface
10353 * New modules: core::{future, iter}, std::arena
10354 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10355 * Extensive cleanup, regularization in libstd, libcore
10358 Version 0.1 (2012-01-20)
10359 ===============================
10361 * Most language features work, including:
10362 * Unique pointers, unique closures, move semantics
10363 * Interface-constrained generics
10364 * Static interface dispatch
10366 * Multithread task scheduling
10367 * Typestate predicates
10368 * Failure unwinding, destructors
10369 * Pattern matching and destructuring assignment
10370 * Lightweight block-lambda syntax
10371 * Preliminary macro-by-example
10373 * Compiler works with the following configurations:
10374 * Linux: x86 and x86_64 hosts and targets
10375 * macOS: x86 and x86_64 hosts and targets
10376 * Windows: x86 hosts and targets
10378 * Cross compilation / multi-target configuration supported.
10380 * Preliminary API-documentation and package-management tools included.
10384 * Documentation is incomplete.
10386 * Performance is below intended target.
10388 * Standard library APIs are subject to extensive change, reorganization.
10390 * Language-level versioning is not yet operational - future code will
10391 break unexpectedly.