1 Version 1.53.0 (2021-06-17)
2 ============================
5 -----------------------
6 - [You can now use unicode for identifiers.][83799] This allows multilingual
7 identifiers but still doesn't allow glyphs that are not considered characters
8 such as `◆` or `🦀`. More specifically you can now use any identifier that
9 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
10 is the same standard as languages like Python, however Rust uses NFC
11 normalization which may be different from other languages.
12 - [You can now specify "or patterns" inside pattern matches.][79278]
13 Previously you could only use `|` (OR) on complete patterns. E.g.
17 matches!(x, Some(1) | Some(2));
19 matches!(x, Some(1 | 2));
21 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
22 has the same semantics as the `:pat` matcher. This is to allow `:pat`
23 to change semantics to being a pattern fragment in a future edition.
26 -----------------------
27 - [Updated the minimum external LLVM version to LLVM 10.][83387]
28 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
29 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
31 \* Refer to Rust's [platform support page][platform-support-doc] for more
32 information on Rust's tiered platform support.
35 -----------------------
36 - [Abort messages will now forward to `android_set_abort_message` on
37 Android platforms when available.][81469]
38 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
39 - [Arrays of any length now implement `IntoIterator`.][84147]
40 Currently calling `.into_iter()` as a method on an array will
41 return `impl Iterator<Item=&T>`, but this may change in a
42 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
43 directly on arrays will provide `impl Iterator<Item=T>` as expected.
44 - [`leading_zeros`, and `trailing_zeros` are now available on all
45 `NonZero` integer types.][84082]
46 - [`{f32, f64}::from_str` now parse and print special values
47 (`NaN`, `-0`) according to IEEE RFC 754.][78618]
48 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
49 - [Add the `BITS` associated constant to all numeric types.][82565]
53 - [`AtomicBool::fetch_update`]
54 - [`AtomicPtr::fetch_update`]
55 - [`BTreeMap::retain`]
56 - [`BTreeSet::retain`]
57 - [`BufReader::seek_relative`]
58 - [`DebugStruct::non_exhaustive`]
61 - [`Duration::is_zero`]
62 - [`Duration::saturating_add`]
63 - [`Duration::saturating_mul`]
64 - [`Duration::saturating_sub`]
65 - [`ErrorKind::Unsupported`]
74 - [`OsStr::make_ascii_lowercase`]
75 - [`OsStr::make_ascii_uppercase`]
76 - [`OsStr::to_ascii_lowercase`]
77 - [`OsStr::to_ascii_uppercase`]
78 - [`Peekable::peek_mut`]
79 - [`Rc::decrement_strong_count`]
80 - [`Rc::increment_strong_count`]
81 - [`Vec::extend_from_within`]
88 - [`f32::is_subnormal`]
89 - [`f64::is_subnormal`]
92 -----------------------
93 - [Cargo now supports git repositories where the default `HEAD` branch is not
94 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
95 which can handle default branches correctly.
96 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
97 - [The `authors` field is no longer included in `Cargo.toml` for new
98 projects.][cargo/9282]
101 -----------------------
102 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
103 without hyperlinks.][81764]
107 - [Implement token-based handling of attributes during expansion][82608]
108 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
109 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
110 to confusion and potential security vulnerabilities and [is no
111 longer recommended][ietf6943].
112 - [The added `BITS` constant may conflict with external definitions.][85667]
113 In particular, this was known to be a problem in the `lexical-core` crate,
114 but they have published fixes for semantic versions 0.4 through 0.7. To
115 update this dependency alone, use `cargo update -p lexical-core`.
119 These changes provide no direct user facing benefits, but represent significant
120 improvements to the internals and overall performance of rustc and
123 - [Rework the `std::sys::windows::alloc` implementation.][83065]
124 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
125 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
126 - [Rework rustdoc const type][82873]
128 [85667]: https://github.com/rust-lang/rust/pull/85667
129 [83386]: https://github.com/rust-lang/rust/pull/83386
130 [82771]: https://github.com/rust-lang/rust/pull/82771
131 [84147]: https://github.com/rust-lang/rust/pull/84147
132 [84082]: https://github.com/rust-lang/rust/pull/84082
133 [83799]: https://github.com/rust-lang/rust/pull/83799
134 [83681]: https://github.com/rust-lang/rust/pull/83681
135 [83652]: https://github.com/rust-lang/rust/pull/83652
136 [83387]: https://github.com/rust-lang/rust/pull/83387
137 [82873]: https://github.com/rust-lang/rust/pull/82873
138 [82864]: https://github.com/rust-lang/rust/pull/82864
139 [82608]: https://github.com/rust-lang/rust/pull/82608
140 [82565]: https://github.com/rust-lang/rust/pull/82565
141 [80525]: https://github.com/rust-lang/rust/pull/80525
142 [79278]: https://github.com/rust-lang/rust/pull/79278
143 [78618]: https://github.com/rust-lang/rust/pull/78618
144 [77704]: https://github.com/rust-lang/rust/pull/77704
145 [83941]: https://github.com/rust-lang/rust/pull/83941
146 [83065]: https://github.com/rust-lang/rust/pull/83065
147 [81764]: https://github.com/rust-lang/rust/pull/81764
148 [81469]: https://github.com/rust-lang/rust/pull/81469
149 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
150 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
151 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
152 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
153 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
154 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
155 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
156 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
157 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
158 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
159 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
160 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
161 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
162 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
163 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
164 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
165 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
166 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
167 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
168 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
169 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
170 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
171 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
172 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
173 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
174 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
175 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
176 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
177 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
178 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
179 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
180 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
181 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
182 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
183 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
184 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
185 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
186 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
187 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
188 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
189 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
190 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
193 Version 1.52.1 (2021-05-10)
194 ============================
196 This release disables incremental compilation, unless the user has explicitly
197 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
199 This is due to the widespread, and frequently occuring, breakage encountered by
200 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
201 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
202 newly added incremental verification are still present in past stable versions,
203 and are not yet fixed on any channel. These bugs can lead to miscompilation of
206 These problems only affect incremental builds, so release builds with Cargo
207 should not be affected unless the user has explicitly opted into incremental.
208 Debug and check builds are affected.
210 See [84970] for more details.
212 [84970]: https://github.com/rust-lang/rust/issues/84970
214 Version 1.52.0 (2021-05-06)
215 ============================
219 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
220 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
221 is allowed by default, and may become a warning or hard error in a
223 - [You can now cast mutable references to arrays to a pointer of the same type as
228 - [Upgraded the default LLVM to LLVM 12.][81451]
230 Added tier 3\* support for the following targets.
232 - [`s390x-unknown-linux-musl`][82166]
233 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
234 - [`powerpc-unknown-openbsd`][82733]
236 \* Refer to Rust's [platform support page][platform-support-doc] for more
237 information on Rust's tiered platform support.
241 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
242 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
243 - [`Arc<impl Error>` now implements `error::Error`.][80553]
244 - [All integer division and remainder operations are now `const`.][80962]
248 - [`Arguments::as_str`]
250 - [`char::REPLACEMENT_CHARACTER`]
251 - [`char::UNICODE_VERSION`]
252 - [`char::decode_utf16`]
253 - [`char::from_digit`]
254 - [`char::from_u32_unchecked`]
256 - [`slice::partition_point`]
257 - [`str::rsplit_once`]
258 - [`str::split_once`]
260 The following previously stable APIs are now `const`.
263 - [`char::len_utf16`]
264 - [`char::to_ascii_uppercase`]
265 - [`char::to_ascii_lowercase`]
266 - [`char::eq_ignore_ascii_case`]
267 - [`u8::to_ascii_uppercase`]
268 - [`u8::to_ascii_lowercase`]
269 - [`u8::eq_ignore_ascii_case`]
273 - [Rustdoc lints are now treated as a tool lint, meaning that
274 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
275 Using the old style is still allowed, and will become a warning in
277 - [Rustdoc now supports argument files.][82261]
278 - [Rustdoc now generates smart punctuation for documentation.][79423]
279 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
287 - [You can now pass multiple filters to tests.][81356] E.g.
288 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
289 - [Rustup now distributes PDB symbols for the `std` library on Windows,
290 allowing you to see `std` symbols when debugging.][82218]
294 These changes provide no direct user facing benefits, but represent significant
295 improvements to the internals and overall performance of rustc and
298 - [Check the result cache before the DepGraph when ensuring queries][81855]
299 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
300 - [Only store a LocalDefId in some HIR nodes][81611]
301 - [Store HIR attributes in a side table][79519]
305 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
306 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
307 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
308 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
309 languages in code blocks.][78429]
310 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
311 - [Changes in how proc macros handle whitespace may lead to panics when used
312 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
313 - [Turn `#[derive]` into a regular macro attribute][79078]
315 [84136]: https://github.com/rust-lang/rust/issues/84136
316 [80763]: https://github.com/rust-lang/rust/pull/80763
317 [82166]: https://github.com/rust-lang/rust/pull/82166
318 [82121]: https://github.com/rust-lang/rust/pull/82121
319 [81879]: https://github.com/rust-lang/rust/pull/81879
320 [82261]: https://github.com/rust-lang/rust/pull/82261
321 [82218]: https://github.com/rust-lang/rust/pull/82218
322 [82216]: https://github.com/rust-lang/rust/pull/82216
323 [82202]: https://github.com/rust-lang/rust/pull/82202
324 [81855]: https://github.com/rust-lang/rust/pull/81855
325 [81766]: https://github.com/rust-lang/rust/pull/81766
326 [81744]: https://github.com/rust-lang/rust/pull/81744
327 [81611]: https://github.com/rust-lang/rust/pull/81611
328 [81479]: https://github.com/rust-lang/rust/pull/81479
329 [81451]: https://github.com/rust-lang/rust/pull/81451
330 [81356]: https://github.com/rust-lang/rust/pull/81356
331 [80962]: https://github.com/rust-lang/rust/pull/80962
332 [80553]: https://github.com/rust-lang/rust/pull/80553
333 [80527]: https://github.com/rust-lang/rust/pull/80527
334 [79519]: https://github.com/rust-lang/rust/pull/79519
335 [79423]: https://github.com/rust-lang/rust/pull/79423
336 [79208]: https://github.com/rust-lang/rust/pull/79208
337 [78429]: https://github.com/rust-lang/rust/pull/78429
338 [82733]: https://github.com/rust-lang/rust/pull/82733
339 [82594]: https://github.com/rust-lang/rust/pull/82594
340 [79078]: https://github.com/rust-lang/rust/pull/79078
341 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
342 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
343 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
344 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
345 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
346 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
347 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
348 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
349 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
350 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
351 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
352 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
353 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
354 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
355 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
356 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
357 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
358 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
359 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
360 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
361 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
362 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
364 Version 1.51.0 (2021-03-25)
365 ============================
369 - [You can now parameterize items such as functions, traits, and `struct`s by constant
370 values in addition to by types and lifetimes.][79135] Also known as "const generics"
371 E.g. you can now write the following. Note: Only values of primitive integers,
372 `bool`, or `char` types are currently permitted.
374 struct GenericArray<T, const LENGTH: usize> {
378 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
379 const fn last(&self) -> Option<&T> {
383 Some(&self.inner[LENGTH - 1])
393 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
394 This option controls whether debug information is split across multiple files
395 or packed into a single file. **Note** This option is unstable on other platforms.
396 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
397 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
398 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
399 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
401 \* Refer to Rust's [platform support page][platform-support-doc] for more
402 information on Rust's tiered platform support.
407 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
408 - [`str` now implements `AsMut<str>`.][80279]
409 - [`u64` and `u128` now implement `From<char>`.][79502]
410 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
411 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
412 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
413 - [`io::Empty` now implements `io::Seek`.][78044]
414 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
415 `T: ?Sized` types.][80764]
416 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
422 - [`Arc::decrement_strong_count`]
423 - [`Arc::increment_strong_count`]
424 - [`Once::call_once_force`]
425 - [`Peekable::next_if_eq`]
426 - [`Peekable::next_if`]
427 - [`Seek::stream_position`]
428 - [`array::IntoIter`]
429 - [`panic::panic_any`]
431 - [`ptr::addr_of_mut!`]
432 - [`slice::fill_with`]
433 - [`slice::split_inclusive_mut`]
434 - [`slice::split_inclusive`]
435 - [`slice::strip_prefix`]
436 - [`slice::strip_suffix`]
437 - [`str::split_inclusive`]
438 - [`sync::OnceState`]
440 - [`VecDeque::range`]
441 - [`VecDeque::range_mut`]
445 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
446 codegen option.][cargo/9112]
447 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
448 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
449 to avoid unifying features of dependencies where that unification could be unwanted.
450 Such as using the same dependency with a `std` feature in a build scripts and
451 proc-macros, while using the `no-std` feature in the final binary. See the
452 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
457 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
458 - [You can now provide a `--default-theme` flag which sets the default theme to use for
459 documentation.][79642]
461 Various improvements to intra-doc links:
463 - [You can link to non-path primitives such as `slice`.][80181]
464 - [You can link to associated items.][74489]
465 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
469 - [You can now pass `--include-ignored` to tests (e.g. with
470 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
475 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
476 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
478 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
479 for the distributed artifacts.][81521]
480 - `armv5te-unknown-linux-gnueabi`
481 - `sparc64-unknown-linux-gnu`
482 - `thumbv7neon-unknown-linux-gnueabihf`
483 - `armv7-unknown-linux-gnueabi`
484 - `x86_64-unknown-linux-gnux32`
485 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
490 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
492 [79135]: https://github.com/rust-lang/rust/pull/79135
493 [74489]: https://github.com/rust-lang/rust/pull/74489
494 [76934]: https://github.com/rust-lang/rust/pull/76934
495 [79570]: https://github.com/rust-lang/rust/pull/79570
496 [80181]: https://github.com/rust-lang/rust/pull/80181
497 [79642]: https://github.com/rust-lang/rust/pull/79642
498 [80945]: https://github.com/rust-lang/rust/pull/80945
499 [80279]: https://github.com/rust-lang/rust/pull/80279
500 [80053]: https://github.com/rust-lang/rust/pull/80053
501 [79502]: https://github.com/rust-lang/rust/pull/79502
502 [75180]: https://github.com/rust-lang/rust/pull/75180
503 [79135]: https://github.com/rust-lang/rust/pull/79135
504 [81521]: https://github.com/rust-lang/rust/pull/81521
505 [80968]: https://github.com/rust-lang/rust/pull/80968
506 [80959]: https://github.com/rust-lang/rust/pull/80959
507 [80718]: https://github.com/rust-lang/rust/pull/80718
508 [80653]: https://github.com/rust-lang/rust/pull/80653
509 [80579]: https://github.com/rust-lang/rust/pull/80579
510 [79998]: https://github.com/rust-lang/rust/pull/79998
511 [78044]: https://github.com/rust-lang/rust/pull/78044
512 [81455]: https://github.com/rust-lang/rust/pull/81455
513 [80764]: https://github.com/rust-lang/rust/pull/80764
514 [80749]: https://github.com/rust-lang/rust/pull/80749
515 [80662]: https://github.com/rust-lang/rust/pull/80662
516 [79134]: https://github.com/rust-lang/rust/pull/79134
517 [80966]: https://github.com/rust-lang/rust/pull/80966
518 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
519 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
520 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
521 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
522 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
523 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
524 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
525 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
526 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
527 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
528 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
529 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
530 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
531 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
532 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
533 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
534 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
535 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
536 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
537 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
538 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
539 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
540 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
542 Version 1.50.0 (2021-02-11)
543 ============================
546 -----------------------
547 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
548 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
549 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
552 -----------------------
553 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
554 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
555 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
556 - [Dropped support for all cloudabi targets.][78439]
558 \* Refer to Rust's [platform support page][platform-support-doc] for more
559 information on Rust's tiered platform support.
562 -----------------------
564 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
565 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
566 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
567 This value cannot be a valid file descriptor, and now means `Option<File>` takes
568 up the same amount of space as `File`.
574 - [`btree_map::Entry::or_insert_with_key`]
577 - [`hash_map::Entry::or_insert_with_key`]
581 - [`UnsafeCell::get_mut`]
583 The following previously stable methods are now `const`.
585 - [`IpAddr::is_ipv4`]
586 - [`IpAddr::is_ipv6`]
587 - [`IpAddr::is_unspecified`]
588 - [`IpAddr::is_loopback`]
589 - [`IpAddr::is_multicast`]
590 - [`Ipv4Addr::octets`]
591 - [`Ipv4Addr::is_loopback`]
592 - [`Ipv4Addr::is_private`]
593 - [`Ipv4Addr::is_link_local`]
594 - [`Ipv4Addr::is_multicast`]
595 - [`Ipv4Addr::is_broadcast`]
596 - [`Ipv4Addr::is_documentation`]
597 - [`Ipv4Addr::to_ipv6_compatible`]
598 - [`Ipv4Addr::to_ipv6_mapped`]
599 - [`Ipv6Addr::segments`]
600 - [`Ipv6Addr::is_unspecified`]
601 - [`Ipv6Addr::is_loopback`]
602 - [`Ipv6Addr::is_multicast`]
603 - [`Ipv6Addr::to_ipv4`]
606 - [`Layout::from_size_align`]
607 - `pow` for all integer types.
608 - `checked_pow` for all integer types.
609 - `saturating_pow` for all integer types.
610 - `wrapping_pow` for all integer types.
611 - `next_power_of_two` for all unsigned integer types.
612 - `checked_next_power_of_two` for all unsigned integer types.
615 -----------------------
617 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
618 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
619 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
620 contents of that directory for changes.][cargo/8973]
621 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
626 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
627 - [Running tests will now print the total time taken to execute.][75752]
632 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
633 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
634 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
635 unhygenic `macro_rules!` macros.][79472]
636 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
637 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
638 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
639 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
640 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
641 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
643 [74989]: https://github.com/rust-lang/rust/pull/74989
644 [79261]: https://github.com/rust-lang/rust/pull/79261
645 [79896]: https://github.com/rust-lang/rust/pull/79896
646 [79484]: https://github.com/rust-lang/rust/pull/79484
647 [79472]: https://github.com/rust-lang/rust/pull/79472
648 [79270]: https://github.com/rust-lang/rust/pull/79270
649 [79003]: https://github.com/rust-lang/rust/pull/79003
650 [78864]: https://github.com/rust-lang/rust/pull/78864
651 [78636]: https://github.com/rust-lang/rust/pull/78636
652 [78439]: https://github.com/rust-lang/rust/pull/78439
653 [78343]: https://github.com/rust-lang/rust/pull/78343
654 [78296]: https://github.com/rust-lang/rust/pull/78296
655 [78068]: https://github.com/rust-lang/rust/pull/78068
656 [75752]: https://github.com/rust-lang/rust/pull/75752
657 [74699]: https://github.com/rust-lang/rust/pull/74699
658 [78142]: https://github.com/rust-lang/rust/pull/78142
659 [77484]: https://github.com/rust-lang/rust/pull/77484
660 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
661 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
662 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
663 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
664 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
665 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
666 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
667 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
668 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
669 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
670 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
671 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
672 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
673 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
674 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
675 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
676 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
677 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
678 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
679 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
680 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
681 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
682 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
683 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
684 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
685 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
686 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
687 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
688 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
689 [`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
690 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
691 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
692 [`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
693 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
696 Version 1.49.0 (2020-12-31)
697 ============================
700 -----------------------
702 - [Unions can now implement `Drop`, and you can now have a field in a union
703 with `ManuallyDrop<T>`.][77547]
704 - [You can now cast uninhabited enums to integers.][76199]
705 - [You can now bind by reference and by move in patterns.][76119] This
706 allows you to selectively borrow individual components of a type. E.g.
714 let person = Person {
715 name: String::from("Alice"),
719 // `name` is moved out of person, but `age` is referenced.
720 let Person { name, ref age } = person;
721 println!("{} {}", name, age);
725 -----------------------
727 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
728 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
729 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
730 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
731 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
732 - [Output from threads spawned in tests is now captured.][78227]
733 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
735 \* Refer to Rust's [platform support page][platform-support-doc] for more
736 information on Rust's tiered platform support.
739 -----------------------
741 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
742 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
747 - [`slice::select_nth_unstable`]
748 - [`slice::select_nth_unstable_by`]
749 - [`slice::select_nth_unstable_by_key`]
751 The following previously stable methods are now `const`.
754 - [`Poll::is_pending`]
757 -----------------------
758 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
759 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
760 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
761 variable will be set if the crate being built is one the user selected to build, either
762 with `-p` or through defaults.
763 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
769 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
770 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
771 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
772 Previously such invalid or unused attributes could be ignored.
773 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
774 read [this post about the changes][rustdoc-ws-post] for more details.
775 - [Trait bounds are no longer inferred for associated types.][79904]
779 These changes provide no direct user facing benefits, but represent significant
780 improvements to the internals and overall performance of rustc and
783 - [rustc's internal crates are now compiled using the `initial-exec` Thread
784 Local Storage model.][78201]
785 - [Calculate visibilities once in resolve.][78077]
786 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
787 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
790 [75991]: https://github.com/rust-lang/rust/pull/75991
791 [78951]: https://github.com/rust-lang/rust/pull/78951
792 [78848]: https://github.com/rust-lang/rust/pull/78848
793 [78746]: https://github.com/rust-lang/rust/pull/78746
794 [78376]: https://github.com/rust-lang/rust/pull/78376
795 [78228]: https://github.com/rust-lang/rust/pull/78228
796 [78227]: https://github.com/rust-lang/rust/pull/78227
797 [78201]: https://github.com/rust-lang/rust/pull/78201
798 [78109]: https://github.com/rust-lang/rust/pull/78109
799 [78077]: https://github.com/rust-lang/rust/pull/78077
800 [77997]: https://github.com/rust-lang/rust/pull/77997
801 [77703]: https://github.com/rust-lang/rust/pull/77703
802 [77547]: https://github.com/rust-lang/rust/pull/77547
803 [77015]: https://github.com/rust-lang/rust/pull/77015
804 [76199]: https://github.com/rust-lang/rust/pull/76199
805 [76119]: https://github.com/rust-lang/rust/pull/76119
806 [75914]: https://github.com/rust-lang/rust/pull/75914
807 [79004]: https://github.com/rust-lang/rust/pull/79004
808 [78676]: https://github.com/rust-lang/rust/pull/78676
809 [79904]: https://github.com/rust-lang/rust/issues/79904
810 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
811 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
812 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
813 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
814 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
815 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
816 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
817 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
818 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
819 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
820 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
822 Version 1.48.0 (2020-11-19)
823 ==========================
828 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
829 is still rejected *semantically*, but can now be parsed by procedural macros.
833 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
834 `rustc` whether to link its own C runtime and libraries or to rely on a external
835 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
836 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
837 Note: If you're using cargo you must explicitly pass the `--target` flag.
838 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
840 \* Refer to Rust's [platform support page][platform-support-doc] for more
841 information on Rust's tiered platform support.
845 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
846 and `&Stderr`.][76275]
847 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
848 - [The `matches!` macro now supports having a trailing comma.][74880]
849 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
850 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
854 - [`slice::as_ptr_range`]
855 - [`slice::as_mut_ptr_range`]
856 - [`VecDeque::make_contiguous`]
857 - [`future::pending`]
860 The following previously stable methods are now `const fn`'s:
862 - [`Option::is_some`]
863 - [`Option::is_none`]
868 - [`Ordering::reverse`]
876 - [You can now link to items in `rustdoc` using the intra-doc link
877 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
878 a link to `std::future`'s documentation. See ["Linking to items by
879 name"][intradoc-links] for more information.
880 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
881 when searching through `rustdoc`'s UI.][75740]
885 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
886 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
887 promoted to `'static` lifetime any more inside `const fn`s.
888 - [Associated type bindings on trait objects are now verified to meet the bounds
889 declared on the trait when checking that they implement the trait.][27675]
890 - [When trait bounds on associated types or opaque types are ambiguous, the
891 compiler no longer makes an arbitrary choice on which bound to use.][54121]
892 - [Fixed recursive nonterminals not being expanded in macros during
893 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
894 correctly handling recursive nonterminal tokens.
895 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
896 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
897 in places where they have no effect.][73461]
898 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
899 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
900 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
901 disallow zero-initialization.][71274]
902 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
903 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
904 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
905 see the [`catch_unwind`] documentation for further information.
911 These changes provide no direct user facing benefits, but represent significant
912 improvements to the internals and overall performance of rustc and
915 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
916 You can continue building with `make` by setting `ninja=false` in
918 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
919 - [Made `ensure_sufficient_stack()` non-generic][76680]
921 [78143]: https://github.com/rust-lang/rust/issues/78143
922 [76680]: https://github.com/rust-lang/rust/pull/76680/
923 [76030]: https://github.com/rust-lang/rust/pull/76030/
924 [70212]: https://github.com/rust-lang/rust/pull/70212/
925 [27675]: https://github.com/rust-lang/rust/issues/27675/
926 [54121]: https://github.com/rust-lang/rust/issues/54121/
927 [71274]: https://github.com/rust-lang/rust/pull/71274/
928 [77386]: https://github.com/rust-lang/rust/pull/77386/
929 [77153]: https://github.com/rust-lang/rust/pull/77153/
930 [77055]: https://github.com/rust-lang/rust/pull/77055/
931 [76275]: https://github.com/rust-lang/rust/pull/76275/
932 [76310]: https://github.com/rust-lang/rust/pull/76310/
933 [76420]: https://github.com/rust-lang/rust/pull/76420/
934 [76158]: https://github.com/rust-lang/rust/pull/76158/
935 [75857]: https://github.com/rust-lang/rust/pull/75857/
936 [75585]: https://github.com/rust-lang/rust/pull/75585/
937 [75740]: https://github.com/rust-lang/rust/pull/75740/
938 [75502]: https://github.com/rust-lang/rust/pull/75502/
939 [74880]: https://github.com/rust-lang/rust/pull/74880/
940 [74922]: https://github.com/rust-lang/rust/pull/74922/
941 [74430]: https://github.com/rust-lang/rust/pull/74430/
942 [74194]: https://github.com/rust-lang/rust/pull/74194/
943 [73461]: https://github.com/rust-lang/rust/pull/73461/
944 [73166]: https://github.com/rust-lang/rust/pull/73166/
945 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
946 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
947 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
948 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
949 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
950 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
951 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
952 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
953 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
954 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
955 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
956 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
957 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
958 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
959 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
962 Version 1.47.0 (2020-10-08)
963 ==========================
967 - [Closures will now warn when not used.][74869]
971 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
972 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
974 - [Upgraded to LLVM 11.][73526]
975 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
976 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
977 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
979 \* Refer to Rust's [platform support page][platform-support-doc] for more
980 information on Rust's tiered platform support.
984 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
985 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
986 those of length less than 33.][74060]
987 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
988 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
989 `PartialEq`, and `PartialOrd`.][73583]
994 - [`Range::is_empty`]
995 - [`RangeInclusive::is_empty`]
996 - [`Result::as_deref`]
997 - [`Result::as_deref_mut`]
999 - [`pointer::offset_from`]
1003 The following previously stable APIs have now been made const.
1005 - [The `new` method for all `NonZero` integers.][73858]
1006 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1007 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1008 methods for all integers.][73858]
1009 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1010 signed integers.][73858]
1011 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1012 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1013 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1014 `is_ascii_control` methods for `char` and `u8`.][73858]
1018 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1019 You can override this by setting the following in your `Cargo.toml`.
1021 [profile.release.build-override]
1024 - [`cargo-help` will now display man pages for commands rather just the
1025 `--help` text.][cargo/8456]
1026 - [`cargo-metadata` now emits a `test` field indicating if a target has
1027 tests enabled.][cargo/8478]
1028 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1029 - [`cargo-publish` will now use an alternative registry by default if it's the
1030 only registry specified in `package.publish`.][cargo/8571]
1034 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1035 type based search.][75366]
1036 - [Added the Ayu theme to rustdoc.][71237]
1040 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1041 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1042 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1043 help to preserve more span information.][73084] These changes may cause
1044 compiliation errors if your macro was unhygenic or didn't correctly handle
1046 - [Moved support for the CloudABI target to tier 3.][75568]
1047 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1048 - [Added the `rustc-docs` component.][75560] This allows you to install
1049 and read the documentation for the compiler internal APIs. (Currently only
1050 available for `x86_64-unknown-linux-gnu`.)
1055 - [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.
1057 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1058 [75048]: https://github.com/rust-lang/rust/pull/75048/
1059 [74163]: https://github.com/rust-lang/rust/pull/74163/
1060 [71237]: https://github.com/rust-lang/rust/pull/71237/
1061 [74869]: https://github.com/rust-lang/rust/pull/74869/
1062 [73858]: https://github.com/rust-lang/rust/pull/73858/
1063 [75716]: https://github.com/rust-lang/rust/pull/75716/
1064 [75908]: https://github.com/rust-lang/rust/pull/75908/
1065 [75516]: https://github.com/rust-lang/rust/pull/75516/
1066 [75560]: https://github.com/rust-lang/rust/pull/75560/
1067 [75568]: https://github.com/rust-lang/rust/pull/75568/
1068 [75366]: https://github.com/rust-lang/rust/pull/75366/
1069 [75204]: https://github.com/rust-lang/rust/pull/75204/
1070 [74650]: https://github.com/rust-lang/rust/pull/74650/
1071 [74419]: https://github.com/rust-lang/rust/pull/74419/
1072 [73964]: https://github.com/rust-lang/rust/pull/73964/
1073 [74021]: https://github.com/rust-lang/rust/pull/74021/
1074 [74060]: https://github.com/rust-lang/rust/pull/74060/
1075 [73893]: https://github.com/rust-lang/rust/pull/73893/
1076 [73526]: https://github.com/rust-lang/rust/pull/73526/
1077 [73583]: https://github.com/rust-lang/rust/pull/73583/
1078 [73084]: https://github.com/rust-lang/rust/pull/73084/
1079 [73197]: https://github.com/rust-lang/rust/pull/73197/
1080 [72488]: https://github.com/rust-lang/rust/pull/72488/
1081 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1082 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1083 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1084 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1085 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1086 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1087 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1088 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1089 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1090 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1091 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1092 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1093 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1094 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1095 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1098 Version 1.46.0 (2020-08-27)
1099 ==========================
1103 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1104 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1105 const functions.][73862]
1106 - [The `#[track_caller]` attribute can now be added to functions to use the
1107 function's caller's location information for panic messages.][72445]
1108 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1109 `x.0.0` over `(x.0).0`.
1110 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1111 You currently can't use `mem::transmute` in constant functions.
1115 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1116 - [Enabled static "Position Independent Executables" by default
1117 for `x86_64-unknown-linux-musl`.][70740]
1121 - [`mem::forget` is now a `const fn`.][73887]
1122 - [`String` now implements `From<char>`.][73466]
1123 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1124 integer types.][73032]
1125 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1126 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1127 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1128 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1129 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1130 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1135 - [`vec::Drain::as_slice`]
1139 Added a number of new environment variables that are now available when
1140 compiling your crate.
1142 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1143 the specific binary being compiled and the name of the crate.
1144 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1145 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1149 - [The target configuration option `abi_blacklist` has been renamed
1150 to `unsupported_abis`.][74150] The old name will still continue to work.
1151 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1152 This was previously accepted but will become a hard error in a future release.
1153 - [Rustc will fail to compile if you have a struct with
1154 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1156 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1157 ensure that spans have the correct information, and may cause breakage if you
1158 were relying on receiving spans with dummy information.
1159 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1160 a legacy installer that was replaced by a MSI installer a few years ago but
1161 was still being built.
1162 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1163 - [Rustc will no longer accept overlapping trait implementations that only
1164 differ in how the lifetime was bound.][72493]
1165 - [Rustc now correctly relates the lifetime of an existential associated
1166 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1167 you to pass a shorter lifetime than expected.
1168 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1169 The library will need to be installed for `rustc` to work, even though we
1170 expect it to be already available on most systems.
1171 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1173 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1174 exact output returned by rustc's pretty printing is an unstable
1175 implementation detail: we recommend any macro relying on it to switch to a
1176 more robust parsing system.
1178 [75453]: https://github.com/rust-lang/rust/issues/75453/
1179 [74820]: https://github.com/rust-lang/rust/issues/74820/
1180 [74420]: https://github.com/rust-lang/rust/issues/74420/
1181 [74109]: https://github.com/rust-lang/rust/pull/74109/
1182 [74150]: https://github.com/rust-lang/rust/pull/74150/
1183 [73862]: https://github.com/rust-lang/rust/pull/73862/
1184 [73887]: https://github.com/rust-lang/rust/pull/73887/
1185 [73466]: https://github.com/rust-lang/rust/pull/73466/
1186 [73516]: https://github.com/rust-lang/rust/pull/73516/
1187 [73293]: https://github.com/rust-lang/rust/pull/73293/
1188 [73007]: https://github.com/rust-lang/rust/pull/73007/
1189 [73032]: https://github.com/rust-lang/rust/pull/73032/
1190 [72920]: https://github.com/rust-lang/rust/pull/72920/
1191 [72569]: https://github.com/rust-lang/rust/pull/72569/
1192 [72583]: https://github.com/rust-lang/rust/pull/72583/
1193 [72584]: https://github.com/rust-lang/rust/pull/72584/
1194 [72717]: https://github.com/rust-lang/rust/pull/72717/
1195 [72437]: https://github.com/rust-lang/rust/pull/72437/
1196 [72445]: https://github.com/rust-lang/rust/pull/72445/
1197 [72486]: https://github.com/rust-lang/rust/pull/72486/
1198 [72493]: https://github.com/rust-lang/rust/pull/72493/
1199 [72331]: https://github.com/rust-lang/rust/pull/72331/
1200 [71896]: https://github.com/rust-lang/rust/pull/71896/
1201 [71660]: https://github.com/rust-lang/rust/pull/71660/
1202 [71322]: https://github.com/rust-lang/rust/pull/71322/
1203 [70740]: https://github.com/rust-lang/rust/pull/70740/
1204 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1205 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1206 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1207 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1208 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1211 Version 1.45.2 (2020-08-03)
1212 ==========================
1214 * [Fix bindings in tuple struct patterns][74954]
1215 * [Fix track_caller integration with trait objects][74784]
1217 [74954]: https://github.com/rust-lang/rust/issues/74954
1218 [74784]: https://github.com/rust-lang/rust/issues/74784
1221 Version 1.45.1 (2020-07-30)
1222 ==========================
1224 * [Fix const propagation with references.][73613]
1225 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1226 * [Avoid spurious implicit region bound.][74509]
1227 * [Install clippy on x.py install][74457]
1229 [73613]: https://github.com/rust-lang/rust/pull/73613
1230 [73078]: https://github.com/rust-lang/rust/issues/73078
1231 [74509]: https://github.com/rust-lang/rust/pull/74509
1232 [74457]: https://github.com/rust-lang/rust/pull/74457
1235 Version 1.45.0 (2020-07-16)
1236 ==========================
1240 - [Out of range float to int conversions using `as` has been defined as a saturating
1241 conversion.][71269] This was previously undefined behaviour, but you can use the
1242 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1243 may be desirable in rare performance sensitive situations.
1244 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1245 using `u64`.][70705]
1246 - [Function like procedural macros can now be used in expression, pattern, and statement
1247 positions.][68717] This means you can now use a function-like procedural macro
1248 anywhere you can use a declarative (`macro_rules!`) macro.
1252 - [You can now override individual target features through the `target-feature`
1253 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1254 equivalent to `-C target-feature=+avx2,+fma`.
1255 - [Added the `force-unwind-tables` flag.][69984] This option allows
1256 rustc to always generate unwind tables regardless of panic strategy.
1257 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1258 to include LLVM bitcode into generated `rlib`s (this is on by default).
1259 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1260 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1261 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1262 - [Upgraded to LLVM 10.][67759]
1264 \* Refer to Rust's [platform support page][platform-support-doc] for more
1265 information on Rust's tiered platform support.
1270 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1272 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1273 - [You can now use `char` with
1274 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1275 a range of codepoints.][72413] E.g.
1276 you can now write the following;
1278 for ch in 'a'..='z' {
1282 // Prints "abcdefghijklmnopqrstuvwxyz"
1284 - [`OsString` now implements `FromStr`.][71662]
1285 - [The `saturating_neg` method has been added to all signed integer primitive
1286 types, and the `saturating_abs` method has been added for all integer
1287 primitive types.][71886]
1288 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1289 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1291 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1292 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1293 integer types.][69813]
1294 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1295 integer types.][72324]
1296 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1301 - [`BTreeMap::remove_entry`]
1303 - [`rc::Weak::as_ptr`]
1304 - [`rc::Weak::from_raw`]
1305 - [`rc::Weak::into_raw`]
1306 - [`str::strip_prefix`]
1307 - [`str::strip_suffix`]
1308 - [`sync::Weak::as_ptr`]
1309 - [`sync::Weak::from_raw`]
1310 - [`sync::Weak::into_raw`]
1311 - [`char::UNICODE_VERSION`]
1312 - [`Span::resolved_at`]
1313 - [`Span::located_at`]
1314 - [`Span::mixed_site`]
1315 - [`unix::process::CommandExt::arg0`]
1320 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1325 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1326 `~~outdated information~~` becomes "~~outdated information~~".
1327 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1331 - [Trying to self initialize a static value (that is creating a value using
1332 itself) is unsound and now causes a compile error.][71140]
1333 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1334 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1335 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1336 previously undocumented and not intended for public use. Rustdoc still provides
1337 a non-zero exit code on errors.
1338 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1339 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1340 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1341 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1342 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1346 - [Make clippy a git subtree instead of a git submodule][70655]
1347 - [Unify the undo log of all snapshot types][69464]
1349 [71848]: https://github.com/rust-lang/rust/issues/71848/
1350 [73420]: https://github.com/rust-lang/rust/issues/73420/
1351 [72324]: https://github.com/rust-lang/rust/pull/72324/
1352 [71843]: https://github.com/rust-lang/rust/pull/71843/
1353 [71886]: https://github.com/rust-lang/rust/pull/71886/
1354 [72234]: https://github.com/rust-lang/rust/pull/72234/
1355 [72239]: https://github.com/rust-lang/rust/pull/72239/
1356 [72397]: https://github.com/rust-lang/rust/pull/72397/
1357 [72413]: https://github.com/rust-lang/rust/pull/72413/
1358 [72014]: https://github.com/rust-lang/rust/pull/72014/
1359 [72062]: https://github.com/rust-lang/rust/pull/72062/
1360 [72094]: https://github.com/rust-lang/rust/pull/72094/
1361 [72133]: https://github.com/rust-lang/rust/pull/72133/
1362 [67759]: https://github.com/rust-lang/rust/pull/67759/
1363 [71900]: https://github.com/rust-lang/rust/pull/71900/
1364 [71928]: https://github.com/rust-lang/rust/pull/71928/
1365 [71662]: https://github.com/rust-lang/rust/pull/71662/
1366 [71716]: https://github.com/rust-lang/rust/pull/71716/
1367 [71447]: https://github.com/rust-lang/rust/pull/71447/
1368 [71269]: https://github.com/rust-lang/rust/pull/71269/
1369 [71095]: https://github.com/rust-lang/rust/pull/71095/
1370 [71140]: https://github.com/rust-lang/rust/pull/71140/
1371 [70655]: https://github.com/rust-lang/rust/pull/70655/
1372 [70705]: https://github.com/rust-lang/rust/pull/70705/
1373 [69984]: https://github.com/rust-lang/rust/pull/69984/
1374 [69813]: https://github.com/rust-lang/rust/pull/69813/
1375 [69464]: https://github.com/rust-lang/rust/pull/69464/
1376 [68717]: https://github.com/rust-lang/rust/pull/68717/
1377 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1378 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1379 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1380 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1381 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1382 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1383 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1384 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1385 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1386 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1387 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1388 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1389 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1390 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1391 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1392 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1393 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1396 Version 1.44.1 (2020-06-18)
1397 ===========================
1399 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1400 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1401 * [Fix crashes when finding backtrace on macOS.][71397]
1402 * [Clippy applies lint levels into different files.][clippy/5356]
1404 [71397]: https://github.com/rust-lang/rust/issues/71397
1405 [73078]: https://github.com/rust-lang/rust/issues/73078
1406 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1407 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1410 Version 1.44.0 (2020-06-04)
1411 ==========================
1415 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1416 - [Added the `unused_braces` lint.][70081]
1418 **Syntax-only changes**
1420 - [Expansion-driven outline module parsing][69838]
1425 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1430 These are still rejected semantically, so you will likely receive an error but
1431 these changes can be seen and parsed by macros and conditional compilation.
1435 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1436 Additionally when in incremental mode rustc defaults to 256 codegen units.
1437 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1438 a panic is thrown.][67502]
1439 - [Added tier 3\* support for the `aarch64-unknown-none` and
1440 `aarch64-unknown-none-softfloat` targets.][68334]
1441 - [Added tier 3 support for `arm64-apple-tvos` and
1442 `x86_64-apple-tvos` targets.][68191]
1447 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1448 `vec![]` to be able to be used in `const` contexts.
1449 - [`convert::Infallible` now implements `Hash`.][70281]
1450 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1451 a `&mut OsStr`.][70048]
1452 - [Unicode 13 is now supported.][69929]
1453 - [`String` now implements `From<&mut str>`.][69661]
1454 - [`IoSlice` now implements `Copy`.][69403]
1455 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1456 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1457 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1458 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1459 integer types.][69373]
1463 - [`PathBuf::with_capacity`]
1464 - [`PathBuf::capacity`]
1465 - [`PathBuf::clear`]
1466 - [`PathBuf::reserve`]
1467 - [`PathBuf::reserve_exact`]
1468 - [`PathBuf::shrink_to_fit`]
1469 - [`f32::to_int_unchecked`]
1470 - [`f64::to_int_unchecked`]
1471 - [`Layout::align_to`]
1472 - [`Layout::pad_to_align`]
1474 - [`Layout::extend`]
1478 - [Added the `cargo tree` command which will print a tree graph of
1479 your dependencies.][cargo/8062] E.g.
1481 mdbook v0.3.2 (/Users/src/rust/mdbook)
1483 │ ├── html5ever v0.24.0
1485 │ │ │ └── cfg-if v0.1.9
1487 │ │ └── markup5ever v0.9.0
1488 │ │ ├── log v0.4.8 (*)
1490 │ │ │ └── phf_shared v0.7.24
1491 │ │ │ ├── siphasher v0.2.3
1492 │ │ │ └── unicase v1.4.2
1493 │ │ │ [build-dependencies]
1494 │ │ │ └── version_check v0.1.5
1497 You can also display dependencies on multiple versions of the same crate with
1498 `cargo tree -d` (short for `cargo tree --duplicates`).
1502 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1503 the version in the sidebar.][69494]
1507 - [Rustc now correctly generates static libraries on Windows GNU targets with
1508 the `.a` extension, rather than the previous `.lib`.][70937]
1509 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1510 - [The `file_name` property in JSON output of macro errors now points the actual
1511 source file rather than the previous format of `<NAME macros>`.][70969]
1512 **Note:** this may not point to a file that actually exists on the user's system.
1513 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1514 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1515 not allow zero initialization such as `NonZeroU8`.][66059] This was
1516 previously a warning.
1517 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1518 operator has been defined as a saturating operation.][71269] This was previously
1519 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1520 continue using the current behaviour, which may be desirable in rare performance
1521 sensitive situations.
1525 These changes provide no direct user facing benefits, but represent significant
1526 improvements to the internals and overall performance of rustc and
1529 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1530 - [Replace big JS dict with JSON parsing.][71250]
1532 [69373]: https://github.com/rust-lang/rust/pull/69373/
1533 [66059]: https://github.com/rust-lang/rust/pull/66059/
1534 [68191]: https://github.com/rust-lang/rust/pull/68191/
1535 [68899]: https://github.com/rust-lang/rust/pull/68899/
1536 [71147]: https://github.com/rust-lang/rust/pull/71147/
1537 [71250]: https://github.com/rust-lang/rust/pull/71250/
1538 [70937]: https://github.com/rust-lang/rust/pull/70937/
1539 [70969]: https://github.com/rust-lang/rust/pull/70969/
1540 [70632]: https://github.com/rust-lang/rust/pull/70632/
1541 [70281]: https://github.com/rust-lang/rust/pull/70281/
1542 [70345]: https://github.com/rust-lang/rust/pull/70345/
1543 [70048]: https://github.com/rust-lang/rust/pull/70048/
1544 [70081]: https://github.com/rust-lang/rust/pull/70081/
1545 [70156]: https://github.com/rust-lang/rust/pull/70156/
1546 [71269]: https://github.com/rust-lang/rust/pull/71269/
1547 [69838]: https://github.com/rust-lang/rust/pull/69838/
1548 [69929]: https://github.com/rust-lang/rust/pull/69929/
1549 [69661]: https://github.com/rust-lang/rust/pull/69661/
1550 [69778]: https://github.com/rust-lang/rust/pull/69778/
1551 [69494]: https://github.com/rust-lang/rust/pull/69494/
1552 [69403]: https://github.com/rust-lang/rust/pull/69403/
1553 [69033]: https://github.com/rust-lang/rust/pull/69033/
1554 [68692]: https://github.com/rust-lang/rust/pull/68692/
1555 [68334]: https://github.com/rust-lang/rust/pull/68334/
1556 [67502]: https://github.com/rust-lang/rust/pull/67502/
1557 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1558 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1559 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1560 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1561 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1562 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1563 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1564 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1565 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1566 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1567 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1568 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1569 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1572 Version 1.43.1 (2020-05-07)
1573 ===========================
1575 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1576 * [Fixed the stabilization of AVX-512 features.][71473]
1577 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1579 [71430]: https://github.com/rust-lang/rust/pull/71430
1580 [71473]: https://github.com/rust-lang/rust/issues/71473
1581 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1584 Version 1.43.0 (2020-04-23)
1585 ==========================
1589 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1590 the type inferred correctly.][68129]
1591 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1593 **Syntax only changes**
1594 - [Allow `type Foo: Ord` syntactically.][69361]
1595 - [Fuse associated and extern items up to defaultness.][69194]
1596 - [Syntactically allow `self` in all `fn` contexts.][68764]
1597 - [Merge `fn` syntax + cleanup item parsing.][68728]
1598 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1599 For example, you may now write:
1601 macro_rules! mac_trait {
1611 These are still rejected *semantically*, so you will likely receive an error but
1612 these changes can be seen and parsed by macros and
1613 conditional compilation.
1618 - [You can now pass multiple lint flags to rustc to override the previous
1619 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1620 everything in the `unused` lint group except `unused-variables` which
1621 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1622 everything in the `unused` lint group **including** `unused-variables` since
1623 the allow flag is specified before the deny flag (and therefore overridden).
1624 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1625 if they are available on `windows-gnu`.][67429]
1626 - [rustc now buffers errors/warnings printed in JSON.][69227]
1630 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1631 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1632 respectively.][69538] **Note** These conversions are only available when `N`
1634 - [You can now use associated constants on floats and integers directly, rather
1635 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1636 `f32::NAN` with no imports.
1637 - [`u8::is_ascii` is now `const`.][68984]
1638 - [`String` now implements `AsMut<str>`.][68742]
1639 - [Added the `primitive` module to `std` and `core`.][67637] This module
1640 reexports Rust's primitive types. This is mainly useful in macros
1641 where you want avoid these types being shadowed.
1642 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1643 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1647 - [`Once::is_completed`]
1652 - [`iter::once_with`]
1656 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1657 your environment.][cargo/7823]
1658 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1659 executable path when running integration tests or benchmarks.][cargo/7697]
1660 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1661 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1665 - [Certain checks in the `const_err` lint were deemed unrelated to const
1666 evaluation][69185], and have been moved to the `unconditional_panic` and
1667 `arithmetic_overflow` lints.
1672 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1673 has been a warning since 1.36.0.
1674 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1675 led to some instances being accepted, and now correctly emits a hard error.
1677 [69340]: https://github.com/rust-lang/rust/pull/69340
1681 These changes provide no direct user facing benefits, but represent significant
1682 improvements to the internals and overall performance of `rustc` and
1685 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1686 - [Improved how rustc generates drop code.][67332]
1687 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1688 - [traits: preallocate 2 Vecs of known initial size][69022]
1689 - [Avoid exponential behaviour when relating types][68772]
1690 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1691 - [Improve performance of coherence checks][68966]
1692 - [Deduplicate types in the generator witness][68672]
1693 - [Invert control in struct_lint_level.][68725]
1695 [67332]: https://github.com/rust-lang/rust/pull/67332/
1696 [67429]: https://github.com/rust-lang/rust/pull/67429/
1697 [67637]: https://github.com/rust-lang/rust/pull/67637/
1698 [67642]: https://github.com/rust-lang/rust/pull/67642/
1699 [67878]: https://github.com/rust-lang/rust/pull/67878/
1700 [67885]: https://github.com/rust-lang/rust/pull/67885/
1701 [68129]: https://github.com/rust-lang/rust/pull/68129/
1702 [68672]: https://github.com/rust-lang/rust/pull/68672/
1703 [68725]: https://github.com/rust-lang/rust/pull/68725/
1704 [68728]: https://github.com/rust-lang/rust/pull/68728/
1705 [68738]: https://github.com/rust-lang/rust/pull/68738/
1706 [68742]: https://github.com/rust-lang/rust/pull/68742/
1707 [68764]: https://github.com/rust-lang/rust/pull/68764/
1708 [68772]: https://github.com/rust-lang/rust/pull/68772/
1709 [68943]: https://github.com/rust-lang/rust/pull/68943/
1710 [68952]: https://github.com/rust-lang/rust/pull/68952/
1711 [68966]: https://github.com/rust-lang/rust/pull/68966/
1712 [68984]: https://github.com/rust-lang/rust/pull/68984/
1713 [69022]: https://github.com/rust-lang/rust/pull/69022/
1714 [69185]: https://github.com/rust-lang/rust/pull/69185/
1715 [69194]: https://github.com/rust-lang/rust/pull/69194/
1716 [69201]: https://github.com/rust-lang/rust/pull/69201/
1717 [69227]: https://github.com/rust-lang/rust/pull/69227/
1718 [69548]: https://github.com/rust-lang/rust/pull/69548/
1719 [69256]: https://github.com/rust-lang/rust/pull/69256/
1720 [69361]: https://github.com/rust-lang/rust/pull/69361/
1721 [69366]: https://github.com/rust-lang/rust/pull/69366/
1722 [69538]: https://github.com/rust-lang/rust/pull/69538/
1723 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1724 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1725 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1726 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1727 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1728 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1729 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1730 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1733 Version 1.42.0 (2020-03-12)
1734 ==========================
1738 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1740 fn foo(words: &[&str]) {
1742 ["Hello", "World", "!", ..] => println!("Hello World!"),
1743 ["Foo", "Bar", ..] => println!("Baz"),
1744 rest => println!("{:?}", rest),
1748 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1749 that you can create an enum that has the exact layout and ABI of the type
1751 - [There are some *syntax-only* changes:][67131]
1752 - `default` is syntactically allowed before items in `trait` definitions.
1753 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1754 leave out their bodies in favor of `;`.
1755 - Bounds on associated types in `impl`s are now syntactically allowed
1756 (e.g. `type Foo: Ord;`).
1757 - `...` (the C-variadic type) may occur syntactically directly as the type of
1758 any function parameter.
1760 These are still rejected *semantically*, so you will likely receive an error
1761 but these changes can be seen and parsed by procedural macros and
1762 conditional compilation.
1766 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1767 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1768 - [`Option::{expect,unwrap}` and
1769 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1770 pointing to the location where they were called, rather than
1771 `core`'s internals. ][67887]
1773 \* Refer to Rust's [platform support page][platform-support-doc] for more
1774 information on Rust's tiered platform support.
1778 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1779 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1780 to implement `Sized`.][67935]
1781 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1782 - [`Layout::new` is now `const`.][66254]
1783 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1788 - [`CondVar::wait_while`]
1789 - [`CondVar::wait_timeout_while`]
1791 - [`DebugMap::value`]
1792 - [`ManuallyDrop::take`]
1794 - [`ptr::slice_from_raw_parts_mut`]
1795 - [`ptr::slice_from_raw_parts`]
1799 - [You no longer need to include `extern crate proc_macro;` to be able to
1800 `use proc_macro;` in the `2018` edition.][cargo/7700]
1804 - [`Error::description` has been deprecated, and its use will now produce a
1805 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1807 [68253]: https://github.com/rust-lang/rust/pull/68253/
1808 [68348]: https://github.com/rust-lang/rust/pull/68348/
1809 [67935]: https://github.com/rust-lang/rust/pull/67935/
1810 [68339]: https://github.com/rust-lang/rust/pull/68339/
1811 [68122]: https://github.com/rust-lang/rust/pull/68122/
1812 [67712]: https://github.com/rust-lang/rust/pull/67712/
1813 [67887]: https://github.com/rust-lang/rust/pull/67887/
1814 [67131]: https://github.com/rust-lang/rust/pull/67131/
1815 [67233]: https://github.com/rust-lang/rust/pull/67233/
1816 [66899]: https://github.com/rust-lang/rust/pull/66899/
1817 [66919]: https://github.com/rust-lang/rust/pull/66919/
1818 [66254]: https://github.com/rust-lang/rust/pull/66254/
1819 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1820 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1821 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1822 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1823 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1824 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1825 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1826 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1827 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1830 Version 1.41.1 (2020-02-27)
1831 ===========================
1833 * [Always check types of static items][69145]
1834 * [Always check lifetime bounds of `Copy` impls][69145]
1835 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1837 [69225]: https://github.com/rust-lang/rust/issues/69225
1838 [69145]: https://github.com/rust-lang/rust/pull/69145
1841 Version 1.41.0 (2020-01-30)
1842 ===========================
1847 - [You can now pass type parameters to foreign items when implementing
1848 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1849 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1850 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1851 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1852 - [You can now use any valid identifier in a `format_args` macro.][66847]
1853 Previously identifiers starting with an underscore were not allowed.
1854 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1855 enum variants.][66183] These are still rejected semantically, but
1856 can be seen and parsed by procedural macros and conditional compilation.
1861 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1862 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1863 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1864 - [You can now pass an arguments file passing the `@path` syntax
1865 to rustc.][66172] Note that the format differs somewhat from what is
1866 found in other tooling; please see [the documentation][argfile-docs] for
1868 - [You can now provide `--extern` flag without a path, indicating that it is
1869 available from the search path or specified with an `-L` flag.][64882]
1871 \* Refer to Rust's [platform support page][platform-support-doc] for more
1872 information on Rust's tiered platform support.
1874 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1879 - [The `core::panic` module is now stable.][66771] It was already stable
1881 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1882 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1883 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1888 - [`Result::map_or`]
1889 - [`Result::map_or_else`]
1890 - [`std::rc::Weak::weak_count`]
1891 - [`std::rc::Weak::strong_count`]
1892 - [`std::sync::Weak::weak_count`]
1893 - [`std::sync::Weak::strong_count`]
1898 - [Cargo will now document all the private items for binary crates
1899 by default.][cargo/7593]
1900 - [`cargo-install` will now reinstall the package if it detects that it is out
1901 of date.][cargo/7560]
1902 - [Cargo.lock now uses a more git friendly format that should help to reduce
1903 merge conflicts.][cargo/7579]
1904 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1905 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1906 optimisation level to `2` for debug builds. You can also use
1907 `[profile.<profile>.build-override]` to override build scripts and
1913 - [You can now specify `edition` in documentation code blocks to compile the block
1914 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1915 should be compiled the 2018 edition of Rust.
1916 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1917 current theme with `--check-theme`.][54733]
1918 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1923 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1924 Apple targets.][apple-32bit-drop] This means that the source code is still
1925 available to build, but the targets are no longer being tested and release
1926 binaries for those platforms will no longer be distributed by the Rust project.
1927 Please refer to the linked blog post for more information.
1929 [54733]: https://github.com/rust-lang/rust/pull/54733/
1930 [61351]: https://github.com/rust-lang/rust/pull/61351/
1931 [67255]: https://github.com/rust-lang/rust/pull/67255/
1932 [66661]: https://github.com/rust-lang/rust/pull/66661/
1933 [66771]: https://github.com/rust-lang/rust/pull/66771/
1934 [66847]: https://github.com/rust-lang/rust/pull/66847/
1935 [66238]: https://github.com/rust-lang/rust/pull/66238/
1936 [66277]: https://github.com/rust-lang/rust/pull/66277/
1937 [66325]: https://github.com/rust-lang/rust/pull/66325/
1938 [66172]: https://github.com/rust-lang/rust/pull/66172/
1939 [66183]: https://github.com/rust-lang/rust/pull/66183/
1940 [65879]: https://github.com/rust-lang/rust/pull/65879/
1941 [65013]: https://github.com/rust-lang/rust/pull/65013/
1942 [64882]: https://github.com/rust-lang/rust/pull/64882/
1943 [64325]: https://github.com/rust-lang/rust/pull/64325/
1944 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1945 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1946 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1947 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1948 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1949 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1950 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1951 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1952 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1953 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1954 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1956 Version 1.40.0 (2019-12-19)
1957 ===========================
1961 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1962 `const` contexts.][65188] e.g.
1965 pub struct Point(i32, i32);
1967 const ORIGIN: Point = {
1968 let constructor = Point;
1974 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1975 indicate that there may be variants or fields added in the future.][64639]
1976 For example this requires adding a wild-card branch (`_ => {}`) to any match
1977 statements on a non-exhaustive `enum`. [(RFC 2008)]
1978 - [You can now use function-like procedural macros in `extern` blocks and in
1979 type positions.][63931] e.g. `type Generated = macro!();`
1980 - [Function-like and attribute procedural macros can now emit
1981 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1982 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1983 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1984 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1988 - [Added tier 3 support\* for the
1989 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1990 - [Added tier 3 support for the
1991 `aarch64-unknown-none-softfloat` target.][64589]
1992 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1993 `mips64el-unknown-linux-muslabi64` targets.][65843]
1995 \* Refer to Rust's [platform support page][platform-support-doc] for more
1996 information on Rust's tiered platform support.
2000 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2004 - [`BTreeMap::get_key_value`]
2005 - [`HashMap::get_key_value`]
2006 - [`Option::as_deref_mut`]
2007 - [`Option::as_deref`]
2008 - [`Option::flatten`]
2009 - [`UdpSocket::peer_addr`]
2010 - [`f32::to_be_bytes`]
2011 - [`f32::to_le_bytes`]
2012 - [`f32::to_ne_bytes`]
2013 - [`f64::to_be_bytes`]
2014 - [`f64::to_le_bytes`]
2015 - [`f64::to_ne_bytes`]
2016 - [`f32::from_be_bytes`]
2017 - [`f32::from_le_bytes`]
2018 - [`f32::from_ne_bytes`]
2019 - [`f64::from_be_bytes`]
2020 - [`f64::from_le_bytes`]
2021 - [`f64::from_ne_bytes`]
2028 - [Cargo will now always display warnings, rather than only on
2029 fresh builds.][cargo/7450]
2030 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2031 now produce an error.][cargo/7507] Previously these flags were ignored.
2032 - [You can now publish `dev-dependencies` without including
2033 a `version`.][cargo/7333]
2037 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2038 when running documentation tests with `rustdoc`.][63803]
2042 - [As previously announced, any previous NLL warnings in the 2015 edition are
2043 now hard errors.][64221]
2044 - [The `include!` macro will now warn if it failed to include the
2045 entire file.][64284] The `include!` macro unintentionally only includes the
2046 first _expression_ in a file, and this can be unintuitive. This will become
2047 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2048 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2049 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2050 or `extern` blocks now correctly emits a hard error.
2052 [65294]: https://github.com/rust-lang/rust/pull/65294/
2053 [66103]: https://github.com/rust-lang/rust/pull/66103/
2054 [65843]: https://github.com/rust-lang/rust/pull/65843/
2055 [65188]: https://github.com/rust-lang/rust/pull/65188/
2056 [65092]: https://github.com/rust-lang/rust/pull/65092/
2057 [64589]: https://github.com/rust-lang/rust/pull/64589/
2058 [64639]: https://github.com/rust-lang/rust/pull/64639/
2059 [64221]: https://github.com/rust-lang/rust/pull/64221/
2060 [64284]: https://github.com/rust-lang/rust/pull/64284/
2061 [63931]: https://github.com/rust-lang/rust/pull/63931/
2062 [64035]: https://github.com/rust-lang/rust/pull/64035/
2063 [63674]: https://github.com/rust-lang/rust/pull/63674/
2064 [63803]: https://github.com/rust-lang/rust/pull/63803/
2065 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2066 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2067 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2068 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2069 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2070 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2071 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2072 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2073 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2074 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2075 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2076 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2077 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2078 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2079 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2080 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2081 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2082 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2083 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2084 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2085 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2086 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2087 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2088 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2089 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2090 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2093 Version 1.39.0 (2019-11-07)
2094 ===========================
2098 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2099 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2100 - [You can now use certain attributes on function, closure, and function pointer
2101 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2102 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2103 attributes applied to items. e.g.
2106 #[cfg(windows)] slice: &[u16],
2107 #[cfg(not(windows))] slice: &[u8],
2112 - [You can now take shared references to bind-by-move patterns in the `if` guards
2113 of `match` arms.][63118] e.g.
2116 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2120 // ---- `nums` is bound by move.
2121 if nums.iter().sum::<u8>() == 10
2122 // ^------ `.iter()` implicitly takes a reference to `nums`.
2125 // ----------- Legal as `nums` was bound by move and so we have ownership.
2127 _ => unreachable!(),
2136 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2137 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2138 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2139 **Note** Cargo currently doesn't use this feature. Refer to
2140 [cargo#7315][cargo/7315] to track this feature's progress.
2141 - [You can now pass `--show-output` argument to test binaries to print the
2142 output of successful tests.][62600]
2145 \* Refer to Rust's [platform support page][platform-support-doc] for more
2146 information on Rust's tiered platform support.
2150 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2151 - [`LinkedList::new` is now a `const` function.][63684]
2152 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2153 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2154 now `const`.][63786]
2158 - [`Pin::into_inner`]
2159 - [`Instant::checked_duration_since`]
2160 - [`Instant::saturating_duration_since`]
2164 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2165 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2166 `--all` is now deprecated.
2170 - [You can now pass `-Clinker` to rustdoc to control the linker used
2171 for compiling doctests.][63834]
2175 - [Code that was previously accepted by the old borrow checker, but rejected by
2176 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2177 previously a warning, and will also become a hard error in the Rust 2015
2178 edition in the 1.40.0 release.
2179 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2180 run tests.][63827] This should improve performance when running a large
2182 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2183 recommended to use the `?` operator instead.
2184 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2187 [62600]: https://github.com/rust-lang/rust/pull/62600/
2188 [62672]: https://github.com/rust-lang/rust/pull/62672/
2189 [63118]: https://github.com/rust-lang/rust/pull/63118/
2190 [63209]: https://github.com/rust-lang/rust/pull/63209/
2191 [63402]: https://github.com/rust-lang/rust/pull/63402/
2192 [63565]: https://github.com/rust-lang/rust/pull/63565/
2193 [63595]: https://github.com/rust-lang/rust/pull/63595/
2194 [63684]: https://github.com/rust-lang/rust/pull/63684/
2195 [63698]: https://github.com/rust-lang/rust/pull/63698/
2196 [63770]: https://github.com/rust-lang/rust/pull/63770/
2197 [63786]: https://github.com/rust-lang/rust/pull/63786/
2198 [63827]: https://github.com/rust-lang/rust/pull/63827/
2199 [63834]: https://github.com/rust-lang/rust/pull/63834/
2200 [63927]: https://github.com/rust-lang/rust/pull/63927/
2201 [63933]: https://github.com/rust-lang/rust/pull/63933/
2202 [63934]: https://github.com/rust-lang/rust/pull/63934/
2203 [63938]: https://github.com/rust-lang/rust/pull/63938/
2204 [63940]: https://github.com/rust-lang/rust/pull/63940/
2205 [63941]: https://github.com/rust-lang/rust/pull/63941/
2206 [63945]: https://github.com/rust-lang/rust/pull/63945/
2207 [64010]: https://github.com/rust-lang/rust/pull/64010/
2208 [64028]: https://github.com/rust-lang/rust/pull/64028/
2209 [64334]: https://github.com/rust-lang/rust/pull/64334/
2210 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2211 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2212 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2213 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2214 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2215 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2217 Version 1.38.0 (2019-09-26)
2218 ==========================
2222 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2223 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2227 - [Added pipelined compilation support to `rustc`.][62766] This will
2228 improve compilation times in some cases. For further information please refer
2229 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2230 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2231 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2232 `x86_64-uwp-windows-msvc` targets.][60260]
2233 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2234 `armv7-unknown-linux-musleabi` targets.][63107]
2235 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2236 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2237 - [Upgraded to LLVM 9.][62592]
2239 \* Refer to Rust's [platform support page][platform-support-doc] for more
2240 information on Rust's tiered platform support.
2244 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2245 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2246 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2247 is available at `std::clone::Clone`). This also makes all built-in macros
2248 available in `std`/`core` root. e.g. `std::include_bytes!`.
2249 - [`str::Chars` now implements `Debug`.][63000]
2250 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2251 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2252 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2253 - [Added euclidean remainder and division operations (`div_euclid`,
2254 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2255 `overflowing`, and `wrapping` versions are available for all
2257 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2258 `PartialEq`.][61491]
2259 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2263 - [`<*const T>::cast`]
2264 - [`<*mut T>::cast`]
2265 - [`Duration::as_secs_f32`]
2266 - [`Duration::as_secs_f64`]
2267 - [`Duration::div_f32`]
2268 - [`Duration::div_f64`]
2269 - [`Duration::from_secs_f32`]
2270 - [`Duration::from_secs_f64`]
2271 - [`Duration::mul_f32`]
2272 - [`Duration::mul_f64`]
2273 - [`any::type_name`]
2277 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2278 - [You can now pass the `--features` option multiple times to enable
2279 multiple features.][cargo/7084]
2284 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2288 - [`rustc` will now warn about some incorrect uses of
2289 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2293 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2295 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2296 issues][62896] with certain crates such as libc.
2298 [60260]: https://github.com/rust-lang/rust/pull/60260/
2299 [61457]: https://github.com/rust-lang/rust/pull/61457/
2300 [61491]: https://github.com/rust-lang/rust/pull/61491/
2301 [61884]: https://github.com/rust-lang/rust/pull/61884/
2302 [61953]: https://github.com/rust-lang/rust/pull/61953/
2303 [62042]: https://github.com/rust-lang/rust/pull/62042/
2304 [62528]: https://github.com/rust-lang/rust/pull/62528/
2305 [62583]: https://github.com/rust-lang/rust/pull/62583/
2306 [62735]: https://github.com/rust-lang/rust/pull/62735/
2307 [62766]: https://github.com/rust-lang/rust/pull/62766/
2308 [62784]: https://github.com/rust-lang/rust/pull/62784/
2309 [62592]: https://github.com/rust-lang/rust/pull/62592/
2310 [62785]: https://github.com/rust-lang/rust/issues/62785/
2311 [62814]: https://github.com/rust-lang/rust/pull/62814/
2312 [62896]: https://github.com/rust-lang/rust/issues/62896/
2313 [63000]: https://github.com/rust-lang/rust/pull/63000/
2314 [63056]: https://github.com/rust-lang/rust/pull/63056/
2315 [63107]: https://github.com/rust-lang/rust/pull/63107/
2316 [63346]: https://github.com/rust-lang/rust/pull/63346/
2317 [63421]: https://github.com/rust-lang/rust/pull/63421/
2318 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2319 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2320 [63048]: https://github.com/rust-lang/rust/pull/63048
2321 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2322 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2323 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2324 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2325 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2326 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2327 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2328 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2329 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2330 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2331 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2332 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2333 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2335 Version 1.37.0 (2019-08-15)
2336 ==========================
2340 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2341 [`Box`][62228], or an [array][62235] and unused.
2342 - [You can now use the `cfg` and `cfg_attr` attributes on
2343 generic parameters.][61547]
2344 - [You can now use enum variants through type alias.][61682] e.g. You can
2345 write the following:
2347 type MyOption = Option<u8>;
2349 fn increment_or_zero(x: MyOption) -> u8 {
2351 MyOption::Some(y) => y + 1,
2352 MyOption::None => 0,
2356 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2357 `const _: u32 = 5;`.
2358 - [You can now use `#[repr(align(X)]` on enums.][61229]
2359 - [The `?` Kleene macro operator is now available in the
2360 2015 edition.][60932]
2364 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2365 and `-C profile-use` flags.][61268] For more information on how to use profile
2366 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2367 - [The `rust-lldb` wrapper script should now work again.][61827]
2371 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2375 - [`BufReader::buffer`]
2376 - [`BufWriter::buffer`]
2377 - [`Cell::from_mut`]
2378 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2379 - [`DoubleEndedIterator::nth_back`]
2381 - [`Wrapping::reverse_bits`]
2382 - [`i128::reverse_bits`]
2383 - [`i16::reverse_bits`]
2384 - [`i32::reverse_bits`]
2385 - [`i64::reverse_bits`]
2386 - [`i8::reverse_bits`]
2387 - [`isize::reverse_bits`]
2388 - [`slice::copy_within`]
2389 - [`u128::reverse_bits`]
2390 - [`u16::reverse_bits`]
2391 - [`u32::reverse_bits`]
2392 - [`u64::reverse_bits`]
2393 - [`u8::reverse_bits`]
2394 - [`usize::reverse_bits`]
2398 - [`Cargo.lock` files are now included by default when publishing executable crates
2399 with executables.][cargo/7026]
2400 - [You can now specify `default-run="foo"` in `[package]` to specify the
2401 default executable to use for `cargo run`.][cargo/7056]
2408 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2409 Please transition your code to using the `..=` syntax for inclusive
2411 - [Using a trait object without the `dyn` will now warn by default.][61203]
2412 Please transition your code to use `dyn Trait` for trait objects instead.
2414 [62228]: https://github.com/rust-lang/rust/pull/62228/
2415 [62235]: https://github.com/rust-lang/rust/pull/62235/
2416 [61802]: https://github.com/rust-lang/rust/pull/61802/
2417 [61827]: https://github.com/rust-lang/rust/pull/61827/
2418 [61547]: https://github.com/rust-lang/rust/pull/61547/
2419 [61682]: https://github.com/rust-lang/rust/pull/61682/
2420 [61268]: https://github.com/rust-lang/rust/pull/61268/
2421 [61342]: https://github.com/rust-lang/rust/pull/61342/
2422 [61347]: https://github.com/rust-lang/rust/pull/61347/
2423 [61100]: https://github.com/rust-lang/rust/pull/61100/
2424 [61203]: https://github.com/rust-lang/rust/pull/61203/
2425 [61229]: https://github.com/rust-lang/rust/pull/61229/
2426 [60932]: https://github.com/rust-lang/rust/pull/60932/
2427 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2428 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2429 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2430 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2431 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2432 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2433 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2434 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2435 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2436 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2437 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2438 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2439 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2440 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2441 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2442 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2443 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2444 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2445 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2446 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2447 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2448 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2449 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2450 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2453 Version 1.36.0 (2019-07-04)
2454 ==========================
2458 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2459 - [The order of traits in trait objects no longer affects the semantics of that
2460 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2461 `dyn fmt::Debug + Send`, where this was previously not the case.
2465 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2466 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2467 - [`mem::needs_drop` is now available as a const fn.][60364]
2468 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2469 - [`String` now implements `BorrowMut<str>`.][60404]
2470 - [`io::Cursor` now implements `Default`.][60234]
2471 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2472 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2473 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2474 environment has access to heap memory allocation.
2475 - [`String` now implements `From<&String>`.][59825]
2476 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2477 return a tuple of each argument when there is multiple arguments.
2478 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2483 - [`VecDeque::rotate_left`]
2484 - [`VecDeque::rotate_right`]
2485 - [`Iterator::copied`]
2487 - [`io::IoSliceMut`]
2488 - [`Read::read_vectored`]
2489 - [`Write::write_vectored`]
2490 - [`str::as_mut_ptr`]
2491 - [`mem::MaybeUninit`]
2492 - [`pointer::align_offset`]
2493 - [`future::Future`]
2495 - [`task::RawWaker`]
2496 - [`task::RawWakerVTable`]
2502 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2503 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2505 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2509 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2516 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2517 longer recommended, and will be deprecated in 1.39.0.
2519 [60318]: https://github.com/rust-lang/rust/pull/60318/
2520 [60364]: https://github.com/rust-lang/rust/pull/60364/
2521 [60370]: https://github.com/rust-lang/rust/pull/60370/
2522 [60404]: https://github.com/rust-lang/rust/pull/60404/
2523 [60234]: https://github.com/rust-lang/rust/pull/60234/
2524 [60244]: https://github.com/rust-lang/rust/pull/60244/
2525 [58623]: https://github.com/rust-lang/rust/pull/58623/
2526 [59648]: https://github.com/rust-lang/rust/pull/59648/
2527 [59675]: https://github.com/rust-lang/rust/pull/59675/
2528 [59825]: https://github.com/rust-lang/rust/pull/59825/
2529 [59826]: https://github.com/rust-lang/rust/pull/59826/
2530 [59445]: https://github.com/rust-lang/rust/pull/59445/
2531 [59114]: https://github.com/rust-lang/rust/pull/59114/
2532 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2533 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2534 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2535 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2536 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2537 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2538 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2539 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2540 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2541 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2542 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2543 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2544 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2545 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2546 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2547 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2548 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2549 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2550 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2551 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2554 Version 1.35.0 (2019-05-23)
2555 ==========================
2559 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2560 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2561 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2563 unsafe fn call_unsafe(func: unsafe fn()) {
2568 unsafe { call_unsafe(|| {}); }
2575 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2576 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2577 - [Added the `wasm32-unknown-wasi` target.][59464]
2582 - [`Thread` will now show its ID in `Debug` output.][59460]
2583 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2584 - [`alloc::System` now implements `Default`.][59451]
2585 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2587 - [`char::{ToLowercase, ToUppercase}` now
2588 implement `ExactSizeIterator`.][58778]
2589 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2590 - [Removed the `Read` trait bounds
2591 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2592 - [You can now call the `dbg!` macro without any parameters to print the file
2593 and line where it is called.][57847]
2594 - [In place ASCII case conversions are now up to 4× faster.][59283]
2595 e.g. `str::make_ascii_lowercase`
2596 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2603 - [`RefCell::replace_with`]
2604 - [`RefCell::map_split`]
2606 - [`Range::contains`]
2607 - [`RangeFrom::contains`]
2608 - [`RangeTo::contains`]
2609 - [`RangeInclusive::contains`]
2610 - [`RangeToInclusive::contains`]
2611 - [`Option::copied`]
2615 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2616 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2621 - [The Rust toolchain is now available natively for musl based distros.][58575]
2623 [59460]: https://github.com/rust-lang/rust/pull/59460/
2624 [59464]: https://github.com/rust-lang/rust/pull/59464/
2625 [59500]: https://github.com/rust-lang/rust/pull/59500/
2626 [59512]: https://github.com/rust-lang/rust/pull/59512/
2627 [59580]: https://github.com/rust-lang/rust/pull/59580/
2628 [59283]: https://github.com/rust-lang/rust/pull/59283/
2629 [59451]: https://github.com/rust-lang/rust/pull/59451/
2630 [59076]: https://github.com/rust-lang/rust/pull/59076/
2631 [58778]: https://github.com/rust-lang/rust/pull/58778/
2632 [58717]: https://github.com/rust-lang/rust/pull/58717/
2633 [58369]: https://github.com/rust-lang/rust/pull/58369/
2634 [58423]: https://github.com/rust-lang/rust/pull/58423/
2635 [58080]: https://github.com/rust-lang/rust/pull/58080/
2636 [57847]: https://github.com/rust-lang/rust/pull/57847/
2637 [58575]: https://github.com/rust-lang/rust/pull/58575
2638 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2639 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2640 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2641 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2642 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2643 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2644 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2645 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2646 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2647 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2648 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2649 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2651 Version 1.34.2 (2019-05-14)
2652 ===========================
2654 * [Destabilize the `Error::type_id` function due to a security
2655 vulnerability][60785] ([CVE-2019-12083])
2657 [60785]: https://github.com/rust-lang/rust/pull/60785
2658 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2660 Version 1.34.1 (2019-04-25)
2661 ===========================
2663 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2664 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2665 * [Fix Clippy panic when checking some macros][clippy/3805]
2667 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2668 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2669 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2671 Version 1.34.0 (2019-04-11)
2672 ==========================
2676 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2677 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2679 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2680 `#[attr{}]` procedural macros.][57367]
2681 - [You can now write `extern crate self as foo;`][57407] to import your
2682 crate's root into the extern prelude.
2687 - [You can now target `riscv64imac-unknown-none-elf` and
2688 `riscv64gc-unknown-none-elf`.][58406]
2689 - [You can now enable linker plugin LTO optimisations with
2690 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2691 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2693 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2698 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2699 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2700 the `Hash` trait to create an iterator.
2701 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2702 methods.][58421] Most notably you no longer require the `Ord` trait to create
2704 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2705 for all numeric types.][58044]
2706 - [Indexing a `str` is now generic over all types that
2707 implement `SliceIndex<str>`.][57604]
2708 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2709 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2710 produce a warning if their returning type is unused.
2711 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2712 `overflowing_pow` are now available for all numeric types.][57873] These are
2713 equivalent to methods such as `wrapping_add` for the `pow` operation.
2721 * [`Error::type_id`]
2722 * [`atomic::AtomicI16`]
2723 * [`atomic::AtomicI32`]
2724 * [`atomic::AtomicI64`]
2725 * [`atomic::AtomicI8`]
2726 * [`atomic::AtomicU16`]
2727 * [`atomic::AtomicU32`]
2728 * [`atomic::AtomicU64`]
2729 * [`atomic::AtomicU8`]
2730 * [`convert::Infallible`]
2731 * [`convert::TryFrom`]
2732 * [`convert::TryInto`]
2734 * [`iter::successors`]
2735 * [`num::NonZeroI128`]
2736 * [`num::NonZeroI16`]
2737 * [`num::NonZeroI32`]
2738 * [`num::NonZeroI64`]
2739 * [`num::NonZeroI8`]
2740 * [`num::NonZeroIsize`]
2741 * [`slice::sort_by_cached_key`]
2742 * [`str::escape_debug`]
2743 * [`str::escape_default`]
2744 * [`str::escape_unicode`]
2745 * [`str::split_ascii_whitespace`]
2748 * [`Instant::checked_add`]
2749 * [`Instant::checked_sub`]
2750 * [`SystemTime::checked_add`]
2751 * [`SystemTime::checked_sub`]
2755 - [You can now use alternative registries to crates.io.][cargo/6654]
2759 - [You can now use the `?` operator in your documentation tests without manually
2760 adding `fn main() -> Result<(), _> {}`.][56470]
2764 - [`Command::before_exec` is being replaced by the unsafe method
2765 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2766 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2767 can now use `const` functions in `static` variables.
2769 [58370]: https://github.com/rust-lang/rust/pull/58370/
2770 [58406]: https://github.com/rust-lang/rust/pull/58406/
2771 [58421]: https://github.com/rust-lang/rust/pull/58421/
2772 [58166]: https://github.com/rust-lang/rust/pull/58166/
2773 [58044]: https://github.com/rust-lang/rust/pull/58044/
2774 [58057]: https://github.com/rust-lang/rust/pull/58057/
2775 [58059]: https://github.com/rust-lang/rust/pull/58059/
2776 [57809]: https://github.com/rust-lang/rust/pull/57809/
2777 [57873]: https://github.com/rust-lang/rust/pull/57873/
2778 [57604]: https://github.com/rust-lang/rust/pull/57604/
2779 [57367]: https://github.com/rust-lang/rust/pull/57367/
2780 [57407]: https://github.com/rust-lang/rust/pull/57407/
2781 [57425]: https://github.com/rust-lang/rust/pull/57425/
2782 [57106]: https://github.com/rust-lang/rust/pull/57106/
2783 [56470]: https://github.com/rust-lang/rust/pull/56470/
2784 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2785 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2786 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2787 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2788 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2789 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2790 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2791 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2792 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2793 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2794 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2795 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2796 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2797 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2798 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2799 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2800 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2801 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2802 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2803 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2804 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2805 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2806 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2807 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2808 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2809 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2810 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2811 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2812 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2813 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2814 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2817 Version 1.33.0 (2019-02-28)
2818 ==========================
2822 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2823 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2824 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2825 E.g. You can have match statement on a `u8` that covers `0..=255` and
2826 you would no longer be required to have a `_ => unreachable!()` case.
2827 - [You can now have multiple patterns in `if let` and `while let`
2828 expressions.][57532] You can do this with the same syntax as a `match`
2838 let state = Creature::Crab("Ferris");
2840 if let Creature::Crab(name) | Creature::Person(name) = state {
2841 println!("This creature's name is: {}", name);
2845 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2846 this feature will by default produce a warning as this behaviour can be
2847 unintuitive. E.g. `if let _ = 5 {}`
2848 - [You can now use `let` bindings, assignments, expression statements,
2849 and irrefutable pattern destructuring in const functions.][57175]
2850 - [You can now call unsafe const functions.][57067] E.g.
2852 const unsafe fn foo() -> i32 { 5 }
2853 const fn bar() -> i32 {
2857 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2858 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2859 - [You can now specify a specific alignment with the `#[repr(packed)]`
2860 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2861 with an alignment of 2 bytes and a size of 6 bytes.
2862 - [You can now import an item from a module as an `_`.][56303] This allows you to
2863 import a trait's impls, and not have the name in the namespace. E.g.
2865 use std::io::Read as _;
2867 // Allowed as there is only one `Read` in the module.
2870 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2874 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2875 command line argument.][56351]
2876 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2877 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2878 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2879 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2880 information on Rust's platform support.
2881 - [Added support for the `thumbv7neon-linux-androideabi` and
2882 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2883 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2887 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2888 functions for all numeric types.][57566]
2889 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2890 are now `const` functions for all numeric types.][57105]
2891 - [The methods `is_positive` and `is_negative` are now `const` functions for
2892 all signed numeric types.][57105]
2893 - [The `get` method for all `NonZero` types is now `const`.][57167]
2894 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2895 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2896 numeric types.][57234]
2897 - [`Ipv4Addr::new` is now a `const` function][57234]
2901 - [`unix::FileExt::read_exact_at`]
2902 - [`unix::FileExt::write_all_at`]
2903 - [`Option::transpose`]
2904 - [`Result::transpose`]
2905 - [`convert::identity`]
2908 - [`marker::PhantomPinned`]
2909 - [`Vec::resize_with`]
2910 - [`VecDeque::resize_with`]
2911 - [`Duration::as_millis`]
2912 - [`Duration::as_micros`]
2913 - [`Duration::as_nanos`]
2918 - [You can now publish crates that require a feature flag to compile with
2919 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2920 - [Cargo should now rebuild a crate if a file was modified during the initial
2925 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2926 are now deprecated in the standard library, and their usage will now produce a warning.
2927 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2929 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2931 - [Libtest no longer creates a new thread for each test when
2932 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2934 [55982]: https://github.com/rust-lang/rust/pull/55982/
2935 [56243]: https://github.com/rust-lang/rust/pull/56243
2936 [56303]: https://github.com/rust-lang/rust/pull/56303/
2937 [56351]: https://github.com/rust-lang/rust/pull/56351/
2938 [56362]: https://github.com/rust-lang/rust/pull/56362
2939 [56642]: https://github.com/rust-lang/rust/pull/56642/
2940 [56769]: https://github.com/rust-lang/rust/pull/56769/
2941 [56805]: https://github.com/rust-lang/rust/pull/56805
2942 [56947]: https://github.com/rust-lang/rust/pull/56947/
2943 [57049]: https://github.com/rust-lang/rust/pull/57049/
2944 [57067]: https://github.com/rust-lang/rust/pull/57067/
2945 [57105]: https://github.com/rust-lang/rust/pull/57105
2946 [57130]: https://github.com/rust-lang/rust/pull/57130/
2947 [57167]: https://github.com/rust-lang/rust/pull/57167/
2948 [57175]: https://github.com/rust-lang/rust/pull/57175/
2949 [57234]: https://github.com/rust-lang/rust/pull/57234/
2950 [57332]: https://github.com/rust-lang/rust/pull/57332/
2951 [57465]: https://github.com/rust-lang/rust/pull/57465/
2952 [57532]: https://github.com/rust-lang/rust/pull/57532/
2953 [57535]: https://github.com/rust-lang/rust/pull/57535/
2954 [57566]: https://github.com/rust-lang/rust/pull/57566/
2955 [57615]: https://github.com/rust-lang/rust/pull/57615/
2956 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2957 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2958 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2959 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2960 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2961 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2962 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2963 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2964 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2965 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2966 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2967 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2968 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2969 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2970 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2971 [platform-support]: https://forge.rust-lang.org/platform-support.html
2973 Version 1.32.0 (2019-01-17)
2974 ==========================
2979 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2980 operator allows you to specify zero or one repetitions similar to the `*` and
2982 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2983 now always resolve to the item (`enum`, `struct`, etc.) available in the
2984 module if present, before resolving to a external crate or an item the prelude.][56759]
2987 enum Color { Red, Green, Blue }
2993 - [You can now match against `PhantomData<T>` types.][55837]
2994 - [You can now match against literals in macros with the `literal`
2995 specifier.][56072] This will match against a literal of any type.
2996 E.g. `1`, `'A'`, `"Hello World"`
2997 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2999 struct Point(i32, i32);
3002 pub fn new(x: i32, y: i32) -> Self {
3006 pub fn is_origin(&self) -> bool {
3014 - [Self can also now be used in type definitions.][56366] E.g.
3018 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3021 Cons(T, Box<Self>) // likewise here
3024 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3025 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3029 - [The default allocator has changed from jemalloc to the default allocator on
3030 your system.][55238] The compiler itself on Linux & macOS will still use
3031 jemalloc, but programs compiled with it will use the system allocator.
3032 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3036 - [`PathBuf` now implements `FromStr`.][55148]
3037 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3038 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3039 easily debug expressions in your rust program. E.g.
3042 let b = dbg!(a * 2) + 1;
3043 // ^-- prints: [src/main.rs:4] a * 2 = 4
3047 The following APIs are now `const` functions and can be used in a
3051 - [`UnsafeCell::get`]
3052 - [`char::is_ascii`]
3054 - [`ManuallyDrop::new`]
3055 - [`ManuallyDrop::into_inner`]
3056 - [`RangeInclusive::start`]
3057 - [`RangeInclusive::end`]
3058 - [`NonNull::as_ptr`]
3061 - [`Duration::as_secs`]
3062 - [`Duration::subsec_millis`]
3063 - [`Duration::subsec_micros`]
3064 - [`Duration::subsec_nanos`]
3066 - [`Ipv4Addr::is_unspecified`]
3068 - [`Ipv6Addr::octets`]
3072 - [`i8::to_be_bytes`]
3073 - [`i8::to_le_bytes`]
3074 - [`i8::to_ne_bytes`]
3075 - [`i8::from_be_bytes`]
3076 - [`i8::from_le_bytes`]
3077 - [`i8::from_ne_bytes`]
3078 - [`i16::to_be_bytes`]
3079 - [`i16::to_le_bytes`]
3080 - [`i16::to_ne_bytes`]
3081 - [`i16::from_be_bytes`]
3082 - [`i16::from_le_bytes`]
3083 - [`i16::from_ne_bytes`]
3084 - [`i32::to_be_bytes`]
3085 - [`i32::to_le_bytes`]
3086 - [`i32::to_ne_bytes`]
3087 - [`i32::from_be_bytes`]
3088 - [`i32::from_le_bytes`]
3089 - [`i32::from_ne_bytes`]
3090 - [`i64::to_be_bytes`]
3091 - [`i64::to_le_bytes`]
3092 - [`i64::to_ne_bytes`]
3093 - [`i64::from_be_bytes`]
3094 - [`i64::from_le_bytes`]
3095 - [`i64::from_ne_bytes`]
3096 - [`i128::to_be_bytes`]
3097 - [`i128::to_le_bytes`]
3098 - [`i128::to_ne_bytes`]
3099 - [`i128::from_be_bytes`]
3100 - [`i128::from_le_bytes`]
3101 - [`i128::from_ne_bytes`]
3102 - [`isize::to_be_bytes`]
3103 - [`isize::to_le_bytes`]
3104 - [`isize::to_ne_bytes`]
3105 - [`isize::from_be_bytes`]
3106 - [`isize::from_le_bytes`]
3107 - [`isize::from_ne_bytes`]
3108 - [`u8::to_be_bytes`]
3109 - [`u8::to_le_bytes`]
3110 - [`u8::to_ne_bytes`]
3111 - [`u8::from_be_bytes`]
3112 - [`u8::from_le_bytes`]
3113 - [`u8::from_ne_bytes`]
3114 - [`u16::to_be_bytes`]
3115 - [`u16::to_le_bytes`]
3116 - [`u16::to_ne_bytes`]
3117 - [`u16::from_be_bytes`]
3118 - [`u16::from_le_bytes`]
3119 - [`u16::from_ne_bytes`]
3120 - [`u32::to_be_bytes`]
3121 - [`u32::to_le_bytes`]
3122 - [`u32::to_ne_bytes`]
3123 - [`u32::from_be_bytes`]
3124 - [`u32::from_le_bytes`]
3125 - [`u32::from_ne_bytes`]
3126 - [`u64::to_be_bytes`]
3127 - [`u64::to_le_bytes`]
3128 - [`u64::to_ne_bytes`]
3129 - [`u64::from_be_bytes`]
3130 - [`u64::from_le_bytes`]
3131 - [`u64::from_ne_bytes`]
3132 - [`u128::to_be_bytes`]
3133 - [`u128::to_le_bytes`]
3134 - [`u128::to_ne_bytes`]
3135 - [`u128::from_be_bytes`]
3136 - [`u128::from_le_bytes`]
3137 - [`u128::from_ne_bytes`]
3138 - [`usize::to_be_bytes`]
3139 - [`usize::to_le_bytes`]
3140 - [`usize::to_ne_bytes`]
3141 - [`usize::from_be_bytes`]
3142 - [`usize::from_le_bytes`]
3143 - [`usize::from_ne_bytes`]
3147 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3148 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3152 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3156 - [The argument types for AVX's
3157 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3158 been changed from `*const` to `*mut` as the previous implementation
3162 [55148]: https://github.com/rust-lang/rust/pull/55148/
3163 [55238]: https://github.com/rust-lang/rust/pull/55238/
3164 [55280]: https://github.com/rust-lang/rust/pull/55280/
3165 [55610]: https://github.com/rust-lang/rust/pull/55610/
3166 [55663]: https://github.com/rust-lang/rust/pull/55663/
3167 [55702]: https://github.com/rust-lang/rust/pull/55702/
3168 [55837]: https://github.com/rust-lang/rust/pull/55837/
3169 [55843]: https://github.com/rust-lang/rust/pull/55843/
3170 [56072]: https://github.com/rust-lang/rust/pull/56072/
3171 [56245]: https://github.com/rust-lang/rust/pull/56245/
3172 [56365]: https://github.com/rust-lang/rust/pull/56365/
3173 [56366]: https://github.com/rust-lang/rust/pull/56366/
3174 [56395]: https://github.com/rust-lang/rust/pull/56395/
3175 [56759]: https://github.com/rust-lang/rust/pull/56759/
3176 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3177 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3178 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3179 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3180 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3181 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3182 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3183 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3184 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3185 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3186 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3187 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3188 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3189 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3190 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3191 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3192 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3193 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3194 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3195 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3196 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3197 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3198 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3199 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3200 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3201 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3202 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3203 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3204 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3205 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3206 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3207 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3208 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3209 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3210 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3211 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3212 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3213 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3214 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3215 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3216 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3217 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3218 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3219 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3220 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3221 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3222 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3223 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3224 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3225 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3226 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3227 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3228 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3229 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3230 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3231 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3232 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3233 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3234 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3235 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3236 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3237 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3238 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3239 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3240 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3241 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3242 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3243 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3244 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3245 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3246 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3247 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3248 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3249 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3250 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3251 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3252 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3253 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3254 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3255 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3256 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3257 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3258 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3259 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3260 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3261 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3262 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3263 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3264 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3265 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3266 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3267 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3268 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3271 Version 1.31.1 (2018-12-20)
3272 ===========================
3274 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3275 - [Fix broken go-to-definition in RLS][rls/1171]
3276 - [Fix infinite loop on hover in RLS][rls/1170]
3278 [56562]: https://github.com/rust-lang/rust/pull/56562
3279 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3280 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3282 Version 1.31.0 (2018-12-06)
3283 ==========================
3287 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3288 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3289 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3290 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3292 - [You can now define and use `const` functions.][54835] These are currently
3293 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3294 [language reference][const-reference] for what exactly is available.
3295 - [You can now use tool lints, which allow you to scope lints from external
3296 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3297 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3298 a crate, not just in exported functions.][54451]
3299 - [You can now use parentheses in pattern matches.][54497]
3303 - [Updated musl to 1.1.20][54430]
3307 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3308 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3309 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3310 into `Option<&mut T>` using the `From` trait.][53218]
3311 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3316 - [`slice::align_to`]
3317 - [`slice::align_to_mut`]
3318 - [`slice::chunks_exact`]
3319 - [`slice::chunks_exact_mut`]
3320 - [`slice::rchunks`]
3321 - [`slice::rchunks_mut`]
3322 - [`slice::rchunks_exact`]
3323 - [`slice::rchunks_exact_mut`]
3324 - [`Option::replace`]
3328 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3329 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3330 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3332 [52813]: https://github.com/rust-lang/rust/pull/52813/
3333 [53218]: https://github.com/rust-lang/rust/pull/53218/
3334 [53555]: https://github.com/rust-lang/rust/issues/53555/
3335 [54057]: https://github.com/rust-lang/rust/pull/54057/
3336 [54240]: https://github.com/rust-lang/rust/pull/54240/
3337 [54430]: https://github.com/rust-lang/rust/pull/54430/
3338 [54451]: https://github.com/rust-lang/rust/pull/54451/
3339 [54497]: https://github.com/rust-lang/rust/pull/54497/
3340 [54778]: https://github.com/rust-lang/rust/pull/54778/
3341 [54835]: https://github.com/rust-lang/rust/pull/54835/
3342 [54870]: https://github.com/rust-lang/rust/pull/54870/
3343 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3344 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3345 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3346 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3347 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3348 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3349 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3350 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3351 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3352 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3353 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3354 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3355 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3356 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3358 Version 1.30.1 (2018-11-08)
3359 ===========================
3361 - [Fixed overflow ICE in rustdoc][54199]
3362 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3364 [54199]: https://github.com/rust-lang/rust/pull/54199
3365 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3367 Version 1.30.0 (2018-10-25)
3368 ==========================
3372 - [Procedural macros are now available.][52081] These kinds of macros allow for
3373 more powerful code generation. There is a [new chapter available][proc-macros]
3374 in the Rust Programming Language book that goes further in depth.
3375 - [You can now use keywords as identifiers using the raw identifiers
3376 syntax (`r#`),][53236] e.g. `let r#for = true;`
3377 - [Using anonymous parameters in traits is now deprecated with a warning and
3378 will be a hard error in the 2018 edition.][53272]
3379 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3380 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3381 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3382 Previously, using a external crate in a module without a use statement
3383 required `let json = ::serde_json::from_str(foo);` but can now be written
3384 as `let json = serde_json::from_str(foo);`.
3385 - [You can now apply the `#[used]` attribute to static items to prevent the
3386 compiler from optimising them away, even if they appear to be unused,][51363]
3387 e.g. `#[used] static FOO: u32 = 1;`
3388 - [You can now import and reexport macros from other crates with the `use`
3389 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3390 the root module of the crate. If your macro relies on calling other local
3391 macros, it is recommended to export with the
3392 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3394 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3395 using the `vis` specifier.][53370]
3396 - [Non-macro attributes now allow all forms of literals, not just
3397 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3398 write `#[attr(true)]`.
3399 - [You can now specify a function to handle a panic in the Rust runtime with the
3400 `#[panic_handler]` attribute.][51366]
3404 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3405 - [Added the `aarch64-unknown-netbsd` target][53165]
3406 - [Upgraded to LLVM 8.][53611]
3410 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3414 - [`Ipv4Addr::BROADCAST`]
3415 - [`Ipv4Addr::LOCALHOST`]
3416 - [`Ipv4Addr::UNSPECIFIED`]
3417 - [`Ipv6Addr::LOCALHOST`]
3418 - [`Ipv6Addr::UNSPECIFIED`]
3419 - [`Iterator::find_map`]
3421 The following methods are replacement methods for `trim_left`, `trim_right`,
3422 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3424 - [`str::trim_end_matches`]
3426 - [`str::trim_start_matches`]
3427 - [`str::trim_start`]
3431 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3432 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3433 equivalent to calling `rustdoc --error-format=json`.
3434 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3438 - [`rustdoc` allows you to specify what edition to treat your code as with the
3439 `--edition` option.][54057]
3440 - [`rustdoc` now has the `--color` (specify whether to output color) and
3441 `--error-format` (specify error format, e.g. `json`) options.][53003]
3442 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3443 debug symbols.][53774]
3444 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3445 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3447 [50911]: https://github.com/rust-lang/rust/pull/50911/
3448 [51363]: https://github.com/rust-lang/rust/pull/51363/
3449 [51366]: https://github.com/rust-lang/rust/pull/51366/
3450 [52081]: https://github.com/rust-lang/rust/pull/52081/
3451 [53003]: https://github.com/rust-lang/rust/pull/53003/
3452 [53033]: https://github.com/rust-lang/rust/pull/53033/
3453 [53044]: https://github.com/rust-lang/rust/pull/53044/
3454 [53165]: https://github.com/rust-lang/rust/pull/53165/
3455 [53611]: https://github.com/rust-lang/rust/pull/53611/
3456 [53213]: https://github.com/rust-lang/rust/pull/53213/
3457 [53236]: https://github.com/rust-lang/rust/pull/53236/
3458 [53272]: https://github.com/rust-lang/rust/pull/53272/
3459 [53370]: https://github.com/rust-lang/rust/pull/53370/
3460 [53459]: https://github.com/rust-lang/rust/pull/53459/
3461 [53774]: https://github.com/rust-lang/rust/pull/53774/
3462 [53822]: https://github.com/rust-lang/rust/pull/53822/
3463 [54057]: https://github.com/rust-lang/rust/pull/54057/
3464 [54146]: https://github.com/rust-lang/rust/pull/54146/
3465 [54404]: https://github.com/rust-lang/rust/pull/54404/
3466 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3467 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3468 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3469 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3471 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3472 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3473 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3474 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3475 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3476 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3477 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3478 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3479 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3480 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3483 Version 1.29.2 (2018-10-11)
3484 ===========================
3486 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3487 - The `rls-preview` component on the windows-gnu targets has been restored.
3489 [54639]: https://github.com/rust-lang/rust/pull/54639
3492 Version 1.29.1 (2018-09-25)
3493 ===========================
3498 - The standard library's `str::repeat` function contained an out of bounds write
3499 caused by an integer overflow. This has been fixed by deterministically
3500 panicking when an overflow happens.
3502 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3506 Version 1.29.0 (2018-09-13)
3507 ==========================
3511 - [Bumped minimum LLVM version to 5.0.][51899]
3512 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3513 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3514 - [Upgraded to LLVM 7.][51966]
3518 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3519 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3520 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3521 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3523 - [`Cell<T>` now allows `T` to be unsized.][50494]
3524 - [`SocketAddr` is now stable on Redox.][52656]
3529 - [`Iterator::flatten`]
3534 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3535 `--locked` to disable this behavior.
3536 - [`cargo-install` will now allow you to cross compile an install
3537 using `--target`.][cargo/5614]
3538 - [Added the `cargo-fix` subcommand to automatically move project code from
3539 2015 edition to 2018.][cargo/5723]
3540 - [`cargo doc` can now optionally document private types using the
3541 `--document-private-items` flag.][cargo/5543]
3545 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3546 the specified level to that level.][52354] For example `--cap-lints warn`
3547 will demote `deny` and `forbid` lints to `warn`.
3548 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3549 fails and `101` if there is a panic.][52197]
3550 - [A preview of clippy has been made available through rustup.][51122]
3551 You can install the preview with `rustup component add clippy-preview`.
3555 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3556 Use `str::get_unchecked(begin..end)` instead.
3557 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3558 Consider using the `home_dir` function from
3559 https://crates.io/crates/dirs instead.
3560 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3561 - [`cfg` attributes and `--cfg` command line flags are now more
3562 strictly validated.][53893]
3564 [53893]: https://github.com/rust-lang/rust/pull/53893/
3565 [52861]: https://github.com/rust-lang/rust/pull/52861/
3566 [51966]: https://github.com/rust-lang/rust/pull/51966/
3567 [52656]: https://github.com/rust-lang/rust/pull/52656/
3568 [52239]: https://github.com/rust-lang/rust/pull/52239/
3569 [52330]: https://github.com/rust-lang/rust/pull/52330/
3570 [52354]: https://github.com/rust-lang/rust/pull/52354/
3571 [52402]: https://github.com/rust-lang/rust/pull/52402/
3572 [52103]: https://github.com/rust-lang/rust/pull/52103/
3573 [52197]: https://github.com/rust-lang/rust/pull/52197/
3574 [51807]: https://github.com/rust-lang/rust/pull/51807/
3575 [51899]: https://github.com/rust-lang/rust/pull/51899/
3576 [51912]: https://github.com/rust-lang/rust/pull/51912/
3577 [51511]: https://github.com/rust-lang/rust/pull/51511/
3578 [51619]: https://github.com/rust-lang/rust/pull/51619/
3579 [51656]: https://github.com/rust-lang/rust/pull/51656/
3580 [51178]: https://github.com/rust-lang/rust/pull/51178/
3581 [51122]: https://github.com/rust-lang/rust/pull/51122
3582 [50494]: https://github.com/rust-lang/rust/pull/50494/
3583 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3584 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3585 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3586 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3587 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3588 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3589 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3592 Version 1.28.0 (2018-08-02)
3593 ===========================
3597 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3598 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3599 the inner type across Foreign Function Interface (FFI) boundaries.
3600 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3601 and can now be used as identifiers.][51196]
3602 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3603 stable.][51241] This will allow users to specify a global allocator for
3605 - [Unit test functions marked with the `#[test]` attribute can now return
3606 `Result<(), E: Debug>` in addition to `()`.][51298]
3607 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3608 allows macros to easily target lifetimes.
3612 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3613 prioritise making smaller binary sizes. `z` is the same as `s` with the
3614 exception that it does not vectorise loops, which typically results in an even
3616 - [The short error format is now stable.][49546] Specified with
3617 `--error-format=short` this option will provide a more compressed output of
3618 rust error messages.
3619 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3620 - [Reduced the number of allocations in the macro parser.][50855] This can
3621 improve compile times of macro heavy crates on average by 5%.
3625 - [Implemented `Default` for `&mut str`.][51306]
3626 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3627 - [Implemented `Extend` for `()`.][50234]
3628 - [The `Debug` implementation of `time::Duration` should now be more easily
3629 human readable.][50364] Previously a `Duration` of one second would printed as
3630 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3631 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3632 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3633 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3634 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3635 for `PathBuf`.][50170]
3636 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3637 and `Wrapping<i128>`.][50465]
3638 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3639 possible.][51050] This can provide up to a 40% speed increase.
3640 - [Improved error messages when using `format!`.][50610]
3644 - [`Iterator::step_by`]
3645 - [`Path::ancestors`]
3646 - [`SystemTime::UNIX_EPOCH`]
3647 - [`alloc::GlobalAlloc`]
3649 - [`alloc::LayoutErr`]
3652 - [`alloc::alloc_zeroed`]
3653 - [`alloc::dealloc`]
3654 - [`alloc::realloc`]
3655 - [`alloc::handle_alloc_error`]
3656 - [`btree_map::Entry::or_default`]
3657 - [`fmt::Alignment`]
3658 - [`hash_map::Entry::or_default`]
3659 - [`iter::repeat_with`]
3660 - [`num::NonZeroUsize`]
3661 - [`num::NonZeroU128`]
3662 - [`num::NonZeroU16`]
3663 - [`num::NonZeroU32`]
3664 - [`num::NonZeroU64`]
3665 - [`num::NonZeroU8`]
3666 - [`ops::RangeBounds`]
3667 - [`slice::SliceIndex`]
3668 - [`slice::from_mut`]
3669 - [`slice::from_ref`]
3670 - [`{Any + Send + Sync}::downcast_mut`]
3671 - [`{Any + Send + Sync}::downcast_ref`]
3672 - [`{Any + Send + Sync}::is`]
3676 - [Cargo will now no longer allow you to publish crates with build scripts that
3677 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3678 considered to be immutable.
3682 - [The `suggestion_applicability` field in `rustc`'s json output is now
3683 stable.][50486] This will allow dev tools to check whether a code suggestion
3684 would apply to them.
3688 - [Rust will consider trait objects with duplicated constraints to be the same
3689 type as without the duplicated constraint.][51276] For example the below code will
3690 now fail to compile.
3695 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3698 impl Trait + Send + Send {
3699 fn test(&self) { println!("two"); }
3703 [49546]: https://github.com/rust-lang/rust/pull/49546/
3704 [50143]: https://github.com/rust-lang/rust/pull/50143/
3705 [50170]: https://github.com/rust-lang/rust/pull/50170/
3706 [50234]: https://github.com/rust-lang/rust/pull/50234/
3707 [50265]: https://github.com/rust-lang/rust/pull/50265/
3708 [50364]: https://github.com/rust-lang/rust/pull/50364/
3709 [50385]: https://github.com/rust-lang/rust/pull/50385/
3710 [50465]: https://github.com/rust-lang/rust/pull/50465/
3711 [50486]: https://github.com/rust-lang/rust/pull/50486/
3712 [50554]: https://github.com/rust-lang/rust/pull/50554/
3713 [50610]: https://github.com/rust-lang/rust/pull/50610/
3714 [50855]: https://github.com/rust-lang/rust/pull/50855/
3715 [51050]: https://github.com/rust-lang/rust/pull/51050/
3716 [51196]: https://github.com/rust-lang/rust/pull/51196/
3717 [51200]: https://github.com/rust-lang/rust/pull/51200/
3718 [51241]: https://github.com/rust-lang/rust/pull/51241/
3719 [51276]: https://github.com/rust-lang/rust/pull/51276/
3720 [51298]: https://github.com/rust-lang/rust/pull/51298/
3721 [51306]: https://github.com/rust-lang/rust/pull/51306/
3722 [51562]: https://github.com/rust-lang/rust/pull/51562/
3723 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3724 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3725 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3726 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3727 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3728 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3729 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3730 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3731 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3732 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3733 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3734 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3735 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3736 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3737 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3738 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3739 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3740 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3741 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3742 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3743 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3744 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3745 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3746 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3747 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3748 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3749 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3750 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3751 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3752 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3754 Version 1.27.2 (2018-07-20)
3755 ===========================
3760 - The borrow checker was fixed to avoid potential unsoundness when using
3761 match ergonomics: [#52213][52213].
3763 [52213]: https://github.com/rust-lang/rust/issues/52213
3765 Version 1.27.1 (2018-07-10)
3766 ===========================
3771 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3772 when running, which enabled executing code as some other user on a
3773 given machine. This release fixes that vulnerability; you can read
3774 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3776 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3781 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3782 match ergonomics: [#51415][51415], [#49534][49534].
3784 [51415]: https://github.com/rust-lang/rust/issues/51415
3785 [49534]: https://github.com/rust-lang/rust/issues/49534
3786 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3787 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3789 Version 1.27.0 (2018-06-21)
3790 ==========================
3794 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3795 be used as an identifier.
3796 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3797 bare `Trait` syntax, and should make it clearer when being used in tandem with
3798 `impl Trait` because it is equivalent to the following syntax:
3799 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3800 `Box<Trait> == Box<dyn Trait>`.
3801 - [Attributes on generic parameters such as types and lifetimes are
3802 now stable.][48851] e.g.
3803 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3804 - [The `#[must_use]` attribute can now also be used on functions as well as
3805 types.][48925] It provides a lint that by default warns users when the
3806 value returned by a function has not been used.
3810 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3814 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3815 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3816 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3817 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3818 the `cfg` attribute.
3819 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3820 std are now available in core.][49896]
3821 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3823 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3824 that the operation isn't done in place.
3825 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3826 the `#[must_use]` attribute][49533] to warn about unused potentially
3827 expensive allocations.
3831 - [`DoubleEndedIterator::rfind`]
3832 - [`DoubleEndedIterator::rfold`]
3833 - [`DoubleEndedIterator::try_rfold`]
3834 - [`Duration::from_micros`]
3835 - [`Duration::from_nanos`]
3836 - [`Duration::subsec_micros`]
3837 - [`Duration::subsec_millis`]
3838 - [`HashMap::remove_entry`]
3839 - [`Iterator::try_fold`]
3840 - [`Iterator::try_for_each`]
3842 - [`Option::filter`]
3843 - [`String::replace_range`]
3844 - [`Take::set_limit`]
3845 - [`hint::unreachable_unchecked`]
3846 - [`os::unix::process::parent_id`]
3847 - [`ptr::swap_nonoverlapping`]
3848 - [`slice::rsplit_mut`]
3850 - [`slice::swap_with_slice`]
3854 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3855 `readme`, and `repository` fields.][cargo/5386]
3856 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3857 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3858 a different directory than `target` for placing compilation artifacts.
3859 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3860 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3861 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3862 where cargo would infer a binary, Cargo will produce a warning. You can
3863 disable this feature ahead of time by setting any of the following to false:
3864 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3865 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3866 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3870 - [Added “The Rustc book” into the official documentation.][49707]
3871 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3872 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3876 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3877 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3878 compile, `"".is_empty()` will still compile.
3879 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3880 will only print the inner type.][48553] E.g.
3881 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3882 not `AtomicBool(true)`.
3883 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3884 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3885 alignment should cover all use cases.
3886 - The `.description()` method on the `std::error::Error` trait
3887 [has been soft-deprecated][50163]. It is no longer required to implement it.
3889 [48553]: https://github.com/rust-lang/rust/pull/48553/
3890 [48851]: https://github.com/rust-lang/rust/pull/48851/
3891 [48925]: https://github.com/rust-lang/rust/pull/48925/
3892 [49533]: https://github.com/rust-lang/rust/pull/49533/
3893 [49623]: https://github.com/rust-lang/rust/pull/49623/
3894 [49630]: https://github.com/rust-lang/rust/pull/49630/
3895 [49664]: https://github.com/rust-lang/rust/pull/49664/
3896 [49699]: https://github.com/rust-lang/rust/pull/49699/
3897 [49707]: https://github.com/rust-lang/rust/pull/49707/
3898 [49719]: https://github.com/rust-lang/rust/pull/49719/
3899 [49896]: https://github.com/rust-lang/rust/pull/49896/
3900 [49968]: https://github.com/rust-lang/rust/pull/49968/
3901 [50163]: https://github.com/rust-lang/rust/pull/50163
3902 [50177]: https://github.com/rust-lang/rust/pull/50177/
3903 [50378]: https://github.com/rust-lang/rust/pull/50378/
3904 [50398]: https://github.com/rust-lang/rust/pull/50398/
3905 [50423]: https://github.com/rust-lang/rust/pull/50423/
3906 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3907 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3908 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3909 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3910 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3911 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3912 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3913 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3914 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3915 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3916 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3917 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3918 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3919 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3920 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3921 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3922 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3923 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3924 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3925 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3926 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3927 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3928 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3929 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3930 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3931 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3932 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3933 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3934 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3935 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3938 Version 1.26.2 (2018-06-05)
3939 ==========================
3944 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3946 [51117]: https://github.com/rust-lang/rust/issues/51117
3949 Version 1.26.1 (2018-05-29)
3950 ==========================
3955 - [RLS now works on Windows.][50646]
3956 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3962 - [`fn main() -> impl Trait` no longer works for non-Termination
3964 This reverts an accidental stabilization.
3965 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3966 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3968 [50646]: https://github.com/rust-lang/rust/issues/50646
3969 [50656]: https://github.com/rust-lang/rust/pull/50656
3970 [50812]: https://github.com/rust-lang/rust/pull/50812
3971 [50950]: https://github.com/rust-lang/rust/issues/50950
3972 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3974 Version 1.26.0 (2018-05-10)
3975 ==========================
3979 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3980 implement either or both traits.][49299]
3981 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3982 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3983 lifetime can be elided.][49458]
3984 - [`impl Trait` is now stable allowing you to have abstract types in returns
3985 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3986 `fn open(path: impl AsRef<Path>)`.
3987 - [Pattern matching will now automatically apply dereferences.][49394]
3988 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3989 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3990 - [A lot of operations are now available in a const context.][46882] E.g. You
3991 can now index into constant arrays, reference and dereference into constants,
3992 and use tuple struct constructors.
3993 - [Fixed entry slice patterns are now stable.][48516] E.g.
3995 let points = [1, 2, 3, 4];
3997 [1, 2, 3, 4] => println!("All points were sequential."),
3998 _ => println!("Not all points were sequential."),
4005 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4006 - [Fixed exponential projection complexity on nested types.][48296]
4007 This can provide up to a ~12% reduction in compile times for certain crates.
4008 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4009 to remap path prefixes outputted by the compiler.
4010 - [Added `powerpc-unknown-netbsd` target.][48281]
4014 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4015 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4016 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4017 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4018 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4019 - [`ascii::escape_default` is now available in libcore.][48735]
4020 - [Trailing commas are now supported in std and core macros.][48056]
4021 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4022 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4027 - [`*const T::copy_to_nonoverlapping`]
4028 - [`*const T::copy_to`]
4029 - [`*const T::read_unaligned`]
4030 - [`*const T::read_volatile`]
4031 - [`*const T::read`]
4033 - [`*const T::wrapping_add`]
4034 - [`*const T::wrapping_sub`]
4036 - [`*mut T::copy_to_nonoverlapping`]
4037 - [`*mut T::copy_to`]
4038 - [`*mut T::read_unaligned`]
4039 - [`*mut T::read_volatile`]
4041 - [`*mut T::replace`]
4044 - [`*mut T::wrapping_add`]
4045 - [`*mut T::wrapping_sub`]
4046 - [`*mut T::write_bytes`]
4047 - [`*mut T::write_unaligned`]
4048 - [`*mut T::write_volatile`]
4051 - [`FromUtf8Error::as_bytes`]
4052 - [`LocalKey::try_with`]
4053 - [`Option::cloned`]
4054 - [`btree_map::Entry::and_modify`]
4055 - [`fs::read_to_string`]
4058 - [`hash_map::Entry::and_modify`]
4059 - [`iter::FusedIterator`]
4060 - [`ops::RangeInclusive`]
4061 - [`ops::RangeToInclusive`]
4063 - [`slice::rotate_left`]
4064 - [`slice::rotate_right`]
4065 - [`String::retain`]
4070 - [Cargo will now output path to custom commands when `-v` is
4071 passed with `--list`][cargo/5041]
4072 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4076 - [The second edition of "The Rust Programming Language" book is now recommended
4077 over the first.][48404]
4082 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4083 syntax is now invalid.
4085 use std::ops::Fn as dyn;
4086 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4088 - [The result of dereferences are no longer promoted to `'static`.][47408]
4092 const PAIR: &(i32, i32) = &(0, 1);
4093 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4096 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4097 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4099 - [Removed hoedown from rustdoc.][48274]
4100 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4102 [46882]: https://github.com/rust-lang/rust/pull/46882
4103 [47379]: https://github.com/rust-lang/rust/pull/47379
4104 [47408]: https://github.com/rust-lang/rust/pull/47408
4105 [47813]: https://github.com/rust-lang/rust/pull/47813
4106 [48056]: https://github.com/rust-lang/rust/pull/48056
4107 [48125]: https://github.com/rust-lang/rust/pull/48125
4108 [48166]: https://github.com/rust-lang/rust/pull/48166
4109 [48235]: https://github.com/rust-lang/rust/pull/48235
4110 [48274]: https://github.com/rust-lang/rust/pull/48274
4111 [48281]: https://github.com/rust-lang/rust/pull/48281
4112 [48296]: https://github.com/rust-lang/rust/pull/48296
4113 [48326]: https://github.com/rust-lang/rust/pull/48326
4114 [48359]: https://github.com/rust-lang/rust/pull/48359
4115 [48404]: https://github.com/rust-lang/rust/pull/48404
4116 [48481]: https://github.com/rust-lang/rust/pull/48481
4117 [48516]: https://github.com/rust-lang/rust/pull/48516
4118 [48628]: https://github.com/rust-lang/rust/pull/48628
4119 [48629]: https://github.com/rust-lang/rust/pull/48629
4120 [48657]: https://github.com/rust-lang/rust/pull/48657
4121 [48735]: https://github.com/rust-lang/rust/pull/48735
4122 [48978]: https://github.com/rust-lang/rust/pull/48978
4123 [49101]: https://github.com/rust-lang/rust/pull/49101
4124 [49109]: https://github.com/rust-lang/rust/pull/49109
4125 [49121]: https://github.com/rust-lang/rust/pull/49121
4126 [49162]: https://github.com/rust-lang/rust/pull/49162
4127 [49184]: https://github.com/rust-lang/rust/pull/49184
4128 [49234]: https://github.com/rust-lang/rust/pull/49234
4129 [49255]: https://github.com/rust-lang/rust/pull/49255
4130 [49299]: https://github.com/rust-lang/rust/pull/49299
4131 [49305]: https://github.com/rust-lang/rust/pull/49305
4132 [49394]: https://github.com/rust-lang/rust/pull/49394
4133 [49458]: https://github.com/rust-lang/rust/pull/49458
4134 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4135 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4136 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4137 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4138 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4139 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4140 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4141 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4142 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4143 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4144 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4145 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4146 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4147 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4148 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4149 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4150 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4151 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4152 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4153 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4154 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4155 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4156 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4157 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4158 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4159 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4160 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4161 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4162 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4163 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4164 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4165 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4166 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4167 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4168 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4169 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4170 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4171 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4172 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4173 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4174 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4175 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4178 Version 1.25.0 (2018-03-29)
4179 ==========================
4183 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4184 - [You can now use nested groups of imports.][47948]
4185 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4186 - [You can now have `|` at the start of a match arm.][47947] e.g.
4188 enum Foo { A, B, C }
4194 | Foo::B => println!("AB"),
4195 | Foo::C => println!("C"),
4202 - [Upgraded to LLVM 6.][47828]
4203 - [Added `-C lto=val` option.][47521]
4204 - [Added `i586-unknown-linux-musl` target][47282]
4208 - [Impl Send for `process::Command` on Unix.][47760]
4209 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4210 - [`UnsafeCell::into_inner` is now safe.][47204]
4211 - [Implement libstd for CloudABI.][47268]
4212 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4213 - [Implement `AsRef<Path>` for Component][46985]
4214 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4215 - [Moved `Duration` to libcore.][46666]
4219 - [`Location::column`]
4222 The following functions can now be used in a constant expression.
4223 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4224 - [`Duration::new`][47300]
4225 - [`Duration::from_secs`][47300]
4226 - [`Duration::from_millis`][47300]
4230 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4231 - [`cargo new` now defaults to creating a binary crate, instead of a
4232 library crate.][cargo/5029]
4236 - [Rust by example is now shipped with new releases][46196]
4240 - [Deprecated `net::lookup_host`.][47510]
4241 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4242 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4243 around indexing operations (see [#47349][47349]). This has been fixed (which also
4244 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4245 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4247 [33903]: https://github.com/rust-lang/rust/pull/33903
4248 [47947]: https://github.com/rust-lang/rust/pull/47947
4249 [47948]: https://github.com/rust-lang/rust/pull/47948
4250 [47760]: https://github.com/rust-lang/rust/pull/47760
4251 [47790]: https://github.com/rust-lang/rust/pull/47790
4252 [47828]: https://github.com/rust-lang/rust/pull/47828
4253 [47398]: https://github.com/rust-lang/rust/pull/47398
4254 [47510]: https://github.com/rust-lang/rust/pull/47510
4255 [47521]: https://github.com/rust-lang/rust/pull/47521
4256 [47204]: https://github.com/rust-lang/rust/pull/47204
4257 [47251]: https://github.com/rust-lang/rust/pull/47251
4258 [47268]: https://github.com/rust-lang/rust/pull/47268
4259 [47282]: https://github.com/rust-lang/rust/pull/47282
4260 [47300]: https://github.com/rust-lang/rust/pull/47300
4261 [47349]: https://github.com/rust-lang/rust/pull/47349
4262 [46931]: https://github.com/rust-lang/rust/pull/46931
4263 [46985]: https://github.com/rust-lang/rust/pull/46985
4264 [47006]: https://github.com/rust-lang/rust/pull/47006
4265 [46830]: https://github.com/rust-lang/rust/pull/46830
4266 [46095]: https://github.com/rust-lang/rust/pull/46095
4267 [46666]: https://github.com/rust-lang/rust/pull/46666
4268 [46196]: https://github.com/rust-lang/rust/pull/46196
4269 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4270 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4271 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4272 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4273 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4276 Version 1.24.1 (2018-03-01)
4277 ==========================
4279 - [Do not abort when unwinding through FFI][48251]
4280 - [Emit UTF-16 files for linker arguments on Windows][48318]
4281 - [Make the error index generator work again][48308]
4282 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4284 [48251]: https://github.com/rust-lang/rust/issues/48251
4285 [48308]: https://github.com/rust-lang/rust/issues/48308
4286 [48318]: https://github.com/rust-lang/rust/issues/48318
4287 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4290 Version 1.24.0 (2018-02-15)
4291 ==========================
4295 - [External `sysv64` ffi is now available.][46528]
4296 eg. `extern "sysv64" fn foo () {}`
4300 - [rustc now uses 16 codegen units by default for release builds.][46910]
4301 For the fastest builds, utilize `codegen-units=1`.
4302 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4303 - [Add `aarch64-unknown-openbsd` support][46760]
4307 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4308 improvement in performance in the majority of cases.
4309 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4310 with Windows.][46798]
4311 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4312 - [impl `From<bool>` for `AtomicBool`][46293]
4313 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4314 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4315 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4316 - [float::from_bits now just uses transmute.][46012] This provides
4317 some optimisations from LLVM.
4318 - [Copied `AsciiExt` methods onto `char`][46077]
4319 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4320 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4321 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4322 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4326 - [`RefCell::replace`]
4328 - [`atomic::spin_loop_hint`]
4330 The following functions can now be used in a constant expression.
4331 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4333 - [`AtomicBool::new`][46287]
4334 - [`AtomicUsize::new`][46287]
4335 - [`AtomicIsize::new`][46287]
4336 - [`AtomicPtr::new`][46287]
4337 - [`Cell::new`][46287]
4338 - [`{integer}::min_value`][46287]
4339 - [`{integer}::max_value`][46287]
4340 - [`mem::size_of`][46287]
4341 - [`mem::align_of`][46287]
4342 - [`ptr::null`][46287]
4343 - [`ptr::null_mut`][46287]
4344 - [`RefCell::new`][46287]
4345 - [`UnsafeCell::new`][46287]
4349 - [Added a `workspace.default-members` config that
4350 overrides implied `--all` in virtual workspaces.][cargo/4743]
4351 - [Enable incremental by default on development builds.][cargo/4817] Also added
4352 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4353 per-project or global basis respectively.
4360 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4361 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4362 in accordance with IETF RFC 4291 §2.2.
4363 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4364 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4365 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4366 - [Leading zeros in tuple struct members is now an error][47084]
4367 - [`column!()` macro is one-based instead of zero-based][46977]
4368 - [`fmt::Arguments` can no longer be shared across threads][45198]
4369 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4370 - [Cargo sets a different working directory for the compiler][cargo/4788]
4372 [44884]: https://github.com/rust-lang/rust/pull/44884
4373 [45198]: https://github.com/rust-lang/rust/pull/45198
4374 [45506]: https://github.com/rust-lang/rust/pull/45506
4375 [45904]: https://github.com/rust-lang/rust/pull/45904
4376 [45990]: https://github.com/rust-lang/rust/pull/45990
4377 [46012]: https://github.com/rust-lang/rust/pull/46012
4378 [46077]: https://github.com/rust-lang/rust/pull/46077
4379 [46094]: https://github.com/rust-lang/rust/pull/46094
4380 [46284]: https://github.com/rust-lang/rust/pull/46284
4381 [46287]: https://github.com/rust-lang/rust/pull/46287
4382 [46293]: https://github.com/rust-lang/rust/pull/46293
4383 [46528]: https://github.com/rust-lang/rust/pull/46528
4384 [46671]: https://github.com/rust-lang/rust/pull/46671
4385 [46713]: https://github.com/rust-lang/rust/pull/46713
4386 [46735]: https://github.com/rust-lang/rust/pull/46735
4387 [46749]: https://github.com/rust-lang/rust/pull/46749
4388 [46760]: https://github.com/rust-lang/rust/pull/46760
4389 [46798]: https://github.com/rust-lang/rust/pull/46798
4390 [46828]: https://github.com/rust-lang/rust/pull/46828
4391 [46831]: https://github.com/rust-lang/rust/pull/46831
4392 [46833]: https://github.com/rust-lang/rust/pull/46833
4393 [46910]: https://github.com/rust-lang/rust/pull/46910
4394 [46977]: https://github.com/rust-lang/rust/pull/46977
4395 [47018]: https://github.com/rust-lang/rust/pull/47018
4396 [47080]: https://github.com/rust-lang/rust/pull/47080
4397 [47084]: https://github.com/rust-lang/rust/pull/47084
4398 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4399 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4400 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4401 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4402 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4403 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4406 Version 1.23.0 (2018-01-04)
4407 ==========================
4411 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4412 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4413 Which should fix some confusing errors in some operations.
4417 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4418 undefined behavior.][45920]
4419 - [rustc now suggests renaming import if names clash.][45660]
4420 - [Display errors/warnings correctly when there are zero-width or
4421 wide characters.][45711]
4422 - [rustc now avoids unnecessary copies of arguments that are
4423 simple bindings][45380] This should improve memory usage on average by 5-10%.
4424 - [Updated musl used to build musl rustc to 1.1.17][45393]
4428 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4429 - [Implement Hash for raw pointers to unsized types][45483]
4430 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4431 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4432 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4433 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4434 and `<*mut T>::as_mut`][44932]
4435 - [Optimized `Thread::{park, unpark}` implementation][45524]
4436 - [Improved `SliceExt::binary_search` performance.][45333]
4437 - [impl `FromIterator<()>` for `()`][45379]
4438 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4446 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4447 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4448 - [Added unit test checking to `cargo check`][cargo/4592]
4449 - [Cargo now lets you install a specific version
4450 using `cargo install --version`][cargo/4637]
4454 - [Releases now ship with the Cargo book documentation.][45692]
4455 - [rustdoc now prints rendering warnings on every run.][45324]
4459 - [Changes have been made to type equality to make it more correct,
4460 in rare cases this could break some code.][45853] [Tracking issue for
4461 further information][45852]
4462 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4463 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4464 Android 9, the minimum supported version is Android 14.
4465 - [Bumped the minimum LLVM to 3.9][45326]
4467 [44042]: https://github.com/rust-lang/rust/pull/44042
4468 [44932]: https://github.com/rust-lang/rust/pull/44932
4469 [45267]: https://github.com/rust-lang/rust/pull/45267
4470 [45324]: https://github.com/rust-lang/rust/pull/45324
4471 [45326]: https://github.com/rust-lang/rust/pull/45326
4472 [45333]: https://github.com/rust-lang/rust/pull/45333
4473 [45379]: https://github.com/rust-lang/rust/pull/45379
4474 [45380]: https://github.com/rust-lang/rust/pull/45380
4475 [45393]: https://github.com/rust-lang/rust/pull/45393
4476 [45435]: https://github.com/rust-lang/rust/pull/45435
4477 [45483]: https://github.com/rust-lang/rust/pull/45483
4478 [45524]: https://github.com/rust-lang/rust/pull/45524
4479 [45571]: https://github.com/rust-lang/rust/pull/45571
4480 [45580]: https://github.com/rust-lang/rust/pull/45580
4481 [45610]: https://github.com/rust-lang/rust/pull/45610
4482 [45660]: https://github.com/rust-lang/rust/pull/45660
4483 [45692]: https://github.com/rust-lang/rust/pull/45692
4484 [45711]: https://github.com/rust-lang/rust/pull/45711
4485 [45772]: https://github.com/rust-lang/rust/pull/45772
4486 [45852]: https://github.com/rust-lang/rust/issues/45852
4487 [45853]: https://github.com/rust-lang/rust/pull/45853
4488 [45887]: https://github.com/rust-lang/rust/pull/45887
4489 [45920]: https://github.com/rust-lang/rust/pull/45920
4490 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4491 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4492 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4495 Version 1.22.1 (2017-11-22)
4496 ==========================
4498 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4500 [46183]: https://github.com/rust-lang/rust/pull/46183
4502 Version 1.22.0 (2017-11-22)
4503 ==========================
4507 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4508 - [Now accepts underscores in unicode escapes][43716]
4509 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4510 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4514 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4515 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4516 This should decrease compile times for debug builds.
4517 - [strict memory alignment now enabled on ARMv6][45094]
4518 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4522 - [Allow atomic operations up to 32 bits
4523 on `armv5te_unknown_linux_gnueabi`][44978]
4524 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4525 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4526 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4527 - [Properly detect overflow in `Instant += Duration`.][44220]
4528 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4529 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4530 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4537 - [Cargo will now build multi file examples in subdirectories of the `examples`
4538 folder that have a `main.rs` file.][cargo/4496]
4539 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4540 the old format will continue to work and can be updated with `cargo update`.
4541 - [Now supports vendoring git repositories][cargo/3992]
4545 - [`libbacktrace` is now available on Apple platforms.][44251]
4546 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4547 This now lets you specify that a given code example will fail to compile.
4551 - [The minimum Android version that rustc can build for has been bumped
4552 to `4.0` from `2.3`][45656]
4553 - [Allowing `T op= &T` for numeric types has broken some type
4554 inference cases][45480]
4557 [42526]: https://github.com/rust-lang/rust/pull/42526
4558 [43017]: https://github.com/rust-lang/rust/pull/43017
4559 [43716]: https://github.com/rust-lang/rust/pull/43716
4560 [43949]: https://github.com/rust-lang/rust/pull/43949
4561 [44015]: https://github.com/rust-lang/rust/pull/44015
4562 [44220]: https://github.com/rust-lang/rust/pull/44220
4563 [44251]: https://github.com/rust-lang/rust/pull/44251
4564 [44287]: https://github.com/rust-lang/rust/pull/44287
4565 [44303]: https://github.com/rust-lang/rust/pull/44303
4566 [44456]: https://github.com/rust-lang/rust/pull/44456
4567 [44466]: https://github.com/rust-lang/rust/pull/44466
4568 [44895]: https://github.com/rust-lang/rust/pull/44895
4569 [44966]: https://github.com/rust-lang/rust/pull/44966
4570 [44978]: https://github.com/rust-lang/rust/pull/44978
4571 [45041]: https://github.com/rust-lang/rust/pull/45041
4572 [45064]: https://github.com/rust-lang/rust/pull/45064
4573 [45075]: https://github.com/rust-lang/rust/pull/45075
4574 [45094]: https://github.com/rust-lang/rust/pull/45094
4575 [45095]: https://github.com/rust-lang/rust/pull/45095
4576 [45480]: https://github.com/rust-lang/rust/issues/45480
4577 [45656]: https://github.com/rust-lang/rust/pull/45656
4578 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4579 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4580 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4587 Version 1.21.0 (2017-10-12)
4588 ==========================
4592 - [You can now use static references for literals.][43838]
4596 let x: &'static u32 = &0;
4599 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4602 my_macro!(Vec<i32>::new); // Always worked
4603 my_macro!(Vec::<i32>::new); // Now works
4608 - [Upgraded jemalloc to 4.5.0][43911]
4609 - [Enabled unwinding panics on Redox][43917]
4610 - [Now runs LLVM in parallel during translation phase.][43506]
4611 This should reduce peak memory usage.
4615 - [Generate builtin impls for `Clone` for all arrays and tuples that
4616 are `T: Clone`][43690]
4617 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4618 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4619 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4624 [`std::mem::discriminant`]
4628 - [You can now call `cargo install` with multiple package names][cargo/4216]
4629 - [Cargo commands inside a virtual workspace will now implicitly
4630 pass `--all`][cargo/4335]
4631 - [Added a `[patch]` section to `Cargo.toml` to handle
4632 prepublication dependencies][cargo/4123] [RFC 1969]
4633 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4634 like patterns][cargo/4270]
4635 - [Added the `--all-targets` option][cargo/4400]
4636 - [Using required dependencies as a feature is now deprecated and emits
4637 a warning][cargo/4364]
4642 - [Cargo docs are moving][43916]
4643 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4644 - [The rustdoc book is now available][43863]
4645 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4646 - [Added a preview of RLS has been made available through rustup][44204]
4647 Install with `rustup component add rls-preview`
4648 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4649 Previously only showed `std::os::unix`.
4653 - [Changes in method matching against higher-ranked types][43880] This may cause
4654 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4655 - [rustc's JSON error output's byte position start at top of file.][42973]
4656 Was previously relative to the rustc's internal `CodeMap` struct which
4657 required the unstable library `libsyntax` to correctly use.
4658 - [`unused_results` lint no longer ignores booleans][43728]
4660 [42565]: https://github.com/rust-lang/rust/pull/42565
4661 [42973]: https://github.com/rust-lang/rust/pull/42973
4662 [43348]: https://github.com/rust-lang/rust/pull/43348
4663 [43459]: https://github.com/rust-lang/rust/pull/43459
4664 [43506]: https://github.com/rust-lang/rust/pull/43506
4665 [43540]: https://github.com/rust-lang/rust/pull/43540
4666 [43690]: https://github.com/rust-lang/rust/pull/43690
4667 [43728]: https://github.com/rust-lang/rust/pull/43728
4668 [43838]: https://github.com/rust-lang/rust/pull/43838
4669 [43863]: https://github.com/rust-lang/rust/pull/43863
4670 [43880]: https://github.com/rust-lang/rust/pull/43880
4671 [43911]: https://github.com/rust-lang/rust/pull/43911
4672 [43916]: https://github.com/rust-lang/rust/pull/43916
4673 [43917]: https://github.com/rust-lang/rust/pull/43917
4674 [44204]: https://github.com/rust-lang/rust/pull/44204
4675 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4676 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4677 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4678 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4679 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4680 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4681 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4682 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4683 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4685 Version 1.20.0 (2017-08-31)
4686 ===========================
4690 - [Associated constants are now stabilised.][42809]
4691 - [A lot of macro bugs are now fixed.][42913]
4696 - [Struct fields are now properly coerced to the expected field type.][42807]
4697 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4698 `wasm32-experimental-emscripten` target.
4699 - [Changed some of the error messages to be more helpful.][42033]
4700 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4702 - [rustc now reports the total number of errors on compilation failure][43015]
4703 previously this was only the number of errors in the pass that failed.
4704 - [Expansion in rustc has been sped up 29x.][42533]
4705 - [added `msp430-none-elf` target.][43099]
4706 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4708 - [Fixes backtraces on Redox][43228]
4709 - [rustc now identifies different versions of same crate when absolute paths of
4710 different types match in an error message.][42826]
4716 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4717 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4719 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4720 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4721 - [Impl `Clone` for `DefaultHasher`.][42799]
4722 - [Impl `Sync` for `SyncSender`.][42397]
4723 - [Impl `FromStr` for `char`][42271]
4724 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4726 - [allow messages in the `unimplemented!()` macro.][42155]
4727 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4728 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4729 - [Upgrade to Unicode 10.0.0][42999]
4730 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4731 - [Skip the main thread's manual stack guard on Linux][43072]
4732 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4733 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4735 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4740 - [`CStr::into_c_string`]
4741 - [`CString::as_c_str`]
4742 - [`CString::into_boxed_c_str`]
4743 - [`Chain::get_mut`]
4744 - [`Chain::get_ref`]
4745 - [`Chain::into_inner`]
4746 - [`Option::get_or_insert_with`]
4747 - [`Option::get_or_insert`]
4748 - [`OsStr::into_os_string`]
4749 - [`OsString::into_boxed_os_str`]
4752 - [`Utf8Error::error_len`]
4753 - [`char::EscapeDebug`]
4754 - [`char::escape_debug`]
4755 - [`compile_error!`]
4756 - [`f32::from_bits`]
4758 - [`f64::from_bits`]
4760 - [`mem::ManuallyDrop`]
4761 - [`slice::sort_unstable_by_key`]
4762 - [`slice::sort_unstable_by`]
4763 - [`slice::sort_unstable`]
4764 - [`str::from_boxed_utf8_unchecked`]
4765 - [`str::as_bytes_mut`]
4766 - [`str::as_bytes_mut`]
4767 - [`str::from_utf8_mut`]
4768 - [`str::from_utf8_unchecked_mut`]
4770 - [`str::get_unchecked_mut`]
4771 - [`str::get_unchecked`]
4773 - [`str::into_boxed_bytes`]
4778 - [Cargo API token location moved from `~/.cargo/config` to
4779 `~/.cargo/credentials`.][cargo/3978]
4780 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4781 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4782 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4783 - [You can now specify version of a binary when installed through
4784 `cargo install` using `--vers`.][cargo/4229]
4785 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4786 failure.][cargo/4248]
4787 - [Changed the convention around which file is the crate root.][cargo/4259]
4788 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4789 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4794 - [Functions with `'static` in their return types will now not be as usable as
4795 if they were using lifetime parameters instead.][42417]
4796 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4797 takes the sign of NaN into account where previously didn't.][42430]
4799 [42033]: https://github.com/rust-lang/rust/pull/42033
4800 [42155]: https://github.com/rust-lang/rust/pull/42155
4801 [42271]: https://github.com/rust-lang/rust/pull/42271
4802 [42397]: https://github.com/rust-lang/rust/pull/42397
4803 [42417]: https://github.com/rust-lang/rust/pull/42417
4804 [42430]: https://github.com/rust-lang/rust/pull/42430
4805 [42431]: https://github.com/rust-lang/rust/pull/42431
4806 [42533]: https://github.com/rust-lang/rust/pull/42533
4807 [42571]: https://github.com/rust-lang/rust/pull/42571
4808 [42613]: https://github.com/rust-lang/rust/pull/42613
4809 [42799]: https://github.com/rust-lang/rust/pull/42799
4810 [42807]: https://github.com/rust-lang/rust/pull/42807
4811 [42809]: https://github.com/rust-lang/rust/pull/42809
4812 [42822]: https://github.com/rust-lang/rust/pull/42822
4813 [42826]: https://github.com/rust-lang/rust/pull/42826
4814 [42854]: https://github.com/rust-lang/rust/pull/42854
4815 [42913]: https://github.com/rust-lang/rust/pull/42913
4816 [42999]: https://github.com/rust-lang/rust/pull/42999
4817 [43011]: https://github.com/rust-lang/rust/pull/43011
4818 [43015]: https://github.com/rust-lang/rust/pull/43015
4819 [43072]: https://github.com/rust-lang/rust/pull/43072
4820 [43077]: https://github.com/rust-lang/rust/pull/43077
4821 [43097]: https://github.com/rust-lang/rust/pull/43097
4822 [43099]: https://github.com/rust-lang/rust/pull/43099
4823 [43170]: https://github.com/rust-lang/rust/pull/43170
4824 [43178]: https://github.com/rust-lang/rust/pull/43178
4825 [43185]: https://github.com/rust-lang/rust/pull/43185
4826 [43228]: https://github.com/rust-lang/rust/pull/43228
4827 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4828 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4829 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4830 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4831 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4832 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4833 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4834 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4835 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4836 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4837 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4838 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4839 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4840 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4841 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4842 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4843 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4844 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4845 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4846 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4847 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4848 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4849 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4850 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4851 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4852 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4853 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4854 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4855 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4856 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4857 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4858 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4859 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4860 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4861 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4862 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4863 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4864 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4865 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4868 Version 1.19.0 (2017-07-20)
4869 ===========================
4874 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4875 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4876 - [Macro recursion limit increased to 1024 from 64.][41676]
4877 - [Added lint for detecting unused macros.][41907]
4878 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4879 For example: `let x = loop { break 7; };`
4880 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4881 contain `Copy` types and cannot have a `Drop` implementation.
4882 Example: `union Foo { bar: u8, baz: usize }`
4883 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4884 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4889 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4890 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4891 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4892 you should use `--target armv7-linux-androideabi`.
4893 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4894 - [Minor optimisation of string operations.][42037]
4895 - [Compiler error message is now `aborting due to previous error(s)` instead of
4896 `aborting due to N previous errors`][42150] This was previously inaccurate and
4897 would only count certain kinds of errors.
4898 - [The compiler now supports Visual Studio 2017][42225]
4899 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4900 - [Added a lot][42264] of [new error codes][42302]
4901 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4902 libraries with C Run-time Libraries(CRT) to be statically linked.
4903 - [Fixed various ARM codegen bugs][42740]
4908 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4909 `Extend<Cow<'a, str>>`][41449]
4910 - [`Vec` now implements `From<&mut [T]>`][41530]
4911 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4912 - [`SplitWhitespace` now implements `Clone`][41659]
4913 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4915 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4916 macros, but for printing to stderr.
4921 - [`OsString::shrink_to_fit`]
4924 - [`thread::ThreadId`]
4929 - [Build scripts can now add environment variables to the environment
4930 the crate is being compiled in.
4931 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4932 - [Subcommands now replace the current process rather than spawning a new
4933 child process][cargo/3970]
4934 - [Workspace members can now accept glob file patterns][cargo/3979]
4935 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4936 the members in a given workspace.][cargo/3988]
4937 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4938 - [Target directory path is now in the cargo metadata][cargo/4022]
4939 - [Cargo no longer checks out a local working directory for the
4940 crates.io index][cargo/4026] This should provide smaller file size for the
4941 registry, and improve cloning times, especially on Windows machines.
4942 - [Added an `--exclude` option for excluding certain packages when using the
4943 `--all` option][cargo/4031]
4944 - [Cargo will now automatically retry when receiving a 5xx error
4945 from crates.io][cargo/4032]
4946 - [The `--features` option now accepts multiple comma or space
4947 delimited values.][cargo/4084]
4948 - [Added support for custom target specific runners][cargo/3954]
4953 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4955 - [Rust will now release XZ compressed packages][rust-installer/57]
4956 - [rustup will now prefer to download rust packages with
4957 XZ compression][rustup/1100] over GZip packages.
4958 - [Added the ability to escape `#` in rust documentation][41785] By adding
4959 additional `#`'s ie. `##` is now `#`
4964 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4965 - [`-Z` flags are now no longer allowed to be used on the stable
4966 compiler.][41751] This has been a warning for a year previous to this.
4967 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4968 longer works][42844]. Users should migrate to the built-in `check`
4969 command, which has been available since 1.16.
4970 - [Ending a float literal with `._` is now a hard error.
4971 Example: `42._` .][41946]
4972 - [Any use of a private `extern crate` outside of its module is now a
4973 hard error.][36886] This was previously a warning.
4974 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4975 relative while the `::` prefix makes a path absolute, but was ignored and the
4976 path was relative regardless.
4977 - [Floating point constants in match patterns is now a hard error][36890]
4978 This was previously a warning.
4979 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4980 match patterns is now a hard error][36891] This was previously a warning.
4981 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4983 - [From the pound escape, lines consisting of multiple `#`s are
4985 - [It is an error to re-export private enum variants][42460]. This is
4986 known to break a number of crates that depend on an older version of
4988 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4989 to use it to find the linker, and the build will fail where it did
4990 not previously][42607]
4992 [36886]: https://github.com/rust-lang/rust/issues/36886
4993 [36888]: https://github.com/rust-lang/rust/issues/36888
4994 [36890]: https://github.com/rust-lang/rust/issues/36890
4995 [36891]: https://github.com/rust-lang/rust/issues/36891
4996 [36892]: https://github.com/rust-lang/rust/issues/36892
4997 [37406]: https://github.com/rust-lang/rust/issues/37406
4998 [39983]: https://github.com/rust-lang/rust/pull/39983
4999 [41145]: https://github.com/rust-lang/rust/pull/41145
5000 [41192]: https://github.com/rust-lang/rust/pull/41192
5001 [41258]: https://github.com/rust-lang/rust/pull/41258
5002 [41370]: https://github.com/rust-lang/rust/pull/41370
5003 [41449]: https://github.com/rust-lang/rust/pull/41449
5004 [41530]: https://github.com/rust-lang/rust/pull/41530
5005 [41624]: https://github.com/rust-lang/rust/pull/41624
5006 [41656]: https://github.com/rust-lang/rust/pull/41656
5007 [41659]: https://github.com/rust-lang/rust/pull/41659
5008 [41676]: https://github.com/rust-lang/rust/pull/41676
5009 [41751]: https://github.com/rust-lang/rust/pull/41751
5010 [41764]: https://github.com/rust-lang/rust/pull/41764
5011 [41785]: https://github.com/rust-lang/rust/pull/41785
5012 [41873]: https://github.com/rust-lang/rust/pull/41873
5013 [41907]: https://github.com/rust-lang/rust/pull/41907
5014 [41946]: https://github.com/rust-lang/rust/pull/41946
5015 [42016]: https://github.com/rust-lang/rust/pull/42016
5016 [42037]: https://github.com/rust-lang/rust/pull/42037
5017 [42068]: https://github.com/rust-lang/rust/pull/42068
5018 [42150]: https://github.com/rust-lang/rust/pull/42150
5019 [42162]: https://github.com/rust-lang/rust/pull/42162
5020 [42225]: https://github.com/rust-lang/rust/pull/42225
5021 [42264]: https://github.com/rust-lang/rust/pull/42264
5022 [42302]: https://github.com/rust-lang/rust/pull/42302
5023 [42460]: https://github.com/rust-lang/rust/issues/42460
5024 [42607]: https://github.com/rust-lang/rust/issues/42607
5025 [42740]: https://github.com/rust-lang/rust/pull/42740
5026 [42844]: https://github.com/rust-lang/rust/issues/42844
5027 [42948]: https://github.com/rust-lang/rust/pull/42948
5028 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5029 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5030 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5031 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5032 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5033 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5034 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5035 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5036 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5037 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5038 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5039 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5040 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5041 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5042 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5043 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5044 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5045 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5046 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5047 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5048 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5049 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5052 Version 1.18.0 (2017-06-08)
5053 ===========================
5058 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5059 make the item visible to just that module tree. Also accepts the keyword
5060 `crate` to make something public to the whole crate but not users of the
5061 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5062 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5063 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5064 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5065 types like `Write + Send`, trailing `+` are now supported in trait objects,
5066 and better error reporting for trait objects starting with `?Sized`.
5067 - [0e+10 is now a valid floating point literal][40589]
5068 - [Now warns if you bind a lifetime parameter to 'static][40734]
5069 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5070 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5071 representation in some cases.][40377]
5076 - [rustc can now emit mir with `--emit mir`][39891]
5077 - [Improved LLVM IR for trivial functions][40367]
5078 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5079 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5080 opportunities found through profiling
5081 - [Improved backtrace formatting when panicking][38165]
5086 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5087 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5088 iteration or reallocation.
5089 - [Simplified HashMap Bucket interface][40561] provides performance
5090 improvements for iterating and cloning.
5091 - [Specialize Vec::from_elem to use calloc][40409]
5092 - [Fixed Race condition in fs::create_dir_all][39799]
5093 - [No longer caching stdio on Windows][40516]
5094 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5095 2.50%~ faster and in one case now 12.50% faster.
5096 - [Optimized `AtomicBool::fetch_nand`][41143]
5101 - [`Child::try_wait`]
5102 - [`HashMap::retain`]
5103 - [`HashSet::retain`]
5105 - [`TcpStream::peek`]
5106 - [`UdpSocket::peek`]
5107 - [`UdpSocket::peek_from`]
5112 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5113 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5114 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5115 - [Added Android build support][cargo/3885]
5116 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5117 of a certain type, for example `cargo build --bins` will build all
5119 - [Added support for haiku][cargo/3952]
5124 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5125 - [Added rust-windbg script for better debugging on Windows][39983]
5126 - [Rust now uses the official cross compiler for NetBSD][40612]
5127 - [rustdoc now accepts `#` at the start of files][40828]
5128 - [Fixed jemalloc support for musl][41168]
5133 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5134 always placed after the sign if it exists and before the digits. With the `#`
5135 flag the zeroes are placed after the prefix and before the digits.
5136 - [Due to the struct field optimisation][40377], using `transmute` on structs
5137 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5138 always been undefined behavior, but is now more likely to break in practice.
5139 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5140 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5141 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5142 - [Overlapping inherent `impl`s are now a hard error][40728]
5143 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5144 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5145 `out.asm` and `out.ll` instead of only one of the filetypes.
5146 - [ calling a function that returns `Self` will no longer work][41805] when
5147 the size of `Self` cannot be statically determined.
5148 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5149 this has caused a few regressions namely:
5151 - Changed the link order of local static/dynamic libraries (respecting the
5152 order on given rather than having the compiler reorder).
5153 - Changed how MinGW is linked, native code linked to dynamic libraries
5154 may require manually linking to the gcc support library (for the native
5157 [38165]: https://github.com/rust-lang/rust/pull/38165
5158 [39799]: https://github.com/rust-lang/rust/pull/39799
5159 [39891]: https://github.com/rust-lang/rust/pull/39891
5160 [39983]: https://github.com/rust-lang/rust/pull/39983
5161 [40043]: https://github.com/rust-lang/rust/pull/40043
5162 [40241]: https://github.com/rust-lang/rust/pull/40241
5163 [40338]: https://github.com/rust-lang/rust/pull/40338
5164 [40367]: https://github.com/rust-lang/rust/pull/40367
5165 [40377]: https://github.com/rust-lang/rust/pull/40377
5166 [40409]: https://github.com/rust-lang/rust/pull/40409
5167 [40516]: https://github.com/rust-lang/rust/pull/40516
5168 [40556]: https://github.com/rust-lang/rust/pull/40556
5169 [40561]: https://github.com/rust-lang/rust/pull/40561
5170 [40589]: https://github.com/rust-lang/rust/pull/40589
5171 [40612]: https://github.com/rust-lang/rust/pull/40612
5172 [40723]: https://github.com/rust-lang/rust/pull/40723
5173 [40728]: https://github.com/rust-lang/rust/pull/40728
5174 [40731]: https://github.com/rust-lang/rust/pull/40731
5175 [40734]: https://github.com/rust-lang/rust/pull/40734
5176 [40805]: https://github.com/rust-lang/rust/pull/40805
5177 [40807]: https://github.com/rust-lang/rust/pull/40807
5178 [40828]: https://github.com/rust-lang/rust/pull/40828
5179 [40870]: https://github.com/rust-lang/rust/pull/40870
5180 [41085]: https://github.com/rust-lang/rust/pull/41085
5181 [41143]: https://github.com/rust-lang/rust/pull/41143
5182 [41168]: https://github.com/rust-lang/rust/pull/41168
5183 [41270]: https://github.com/rust-lang/rust/issues/41270
5184 [41469]: https://github.com/rust-lang/rust/pull/41469
5185 [41805]: https://github.com/rust-lang/rust/issues/41805
5186 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5187 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5188 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5189 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5190 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5191 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5192 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5193 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5194 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5195 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5196 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5197 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5198 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5199 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5202 Version 1.17.0 (2017-04-27)
5203 ===========================
5208 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5209 * [Fields of structs may be initialized without duplicating the field/variable
5210 names][39761]. [RFC 1682]
5211 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5212 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5213 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5214 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5215 `'b`. Soundness fix.
5216 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5217 * [Static variables may contain references to other statics][40027]
5222 * [Exit quickly on only `--emit dep-info`][40336]
5223 * [Make `-C relocation-model` more correctly determine whether the linker
5224 creates a position-independent executable][40245]
5225 * [Add `-C overflow-checks` to directly control whether integer overflow
5227 * [The rustc type checker now checks items on demand instead of in a single
5228 in-order pass][40008]. This is mostly an internal refactoring in support of
5229 future work, including incremental type checking, but also resolves [RFC
5230 1647], allowing `Self` to appear in `impl` `where` clauses.
5231 * [Optimize vtable loads][39995]
5232 * [Turn off vectorization for Emscripten targets][39990]
5233 * [Provide suggestions for unknown macros imported with `use`][39953]
5234 * [Fix ICEs in path resolution][39939]
5235 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5236 * [Add clearer error message using `&str + &str`][39116]
5247 * [`Ordering::then`]
5248 * [`Ordering::then_with`]
5249 * [`BTreeMap::range`]
5250 * [`BTreeMap::range_mut`]
5251 * [`collections::Bound`]
5252 * [`process::abort`]
5253 * [`ptr::read_unaligned`]
5254 * [`ptr::write_unaligned`]
5255 * [`Result::expect_err`]
5258 * [`Cell::into_inner`]
5264 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5265 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5266 * [`String` implements `FromIterator<&char>`][40028]
5267 * `Box` [implements][40009] a number of new conversions:
5268 `From<Box<str>> for String`,
5269 `From<Box<[T]>> for Vec<T>`,
5270 `From<Box<CStr>> for CString`,
5271 `From<Box<OsStr>> for OsString`,
5272 `From<Box<Path>> for PathBuf`,
5273 `Into<Box<str>> for String`,
5274 `Into<Box<[T]>> for Vec<T>`,
5275 `Into<Box<CStr>> for CString`,
5276 `Into<Box<OsStr>> for OsString`,
5277 `Into<Box<Path>> for PathBuf`,
5278 `Default for Box<str>`,
5279 `Default for Box<CStr>`,
5280 `Default for Box<OsStr>`,
5281 `From<&CStr> for Box<CStr>`,
5282 `From<&OsStr> for Box<OsStr>`,
5283 `From<&Path> for Box<Path>`
5284 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5285 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5286 * [Slightly optimize `slice::sort`][39538]
5287 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5288 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5289 `Box<str>` implements `From<&str>`][39438]
5290 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5291 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5292 * [`format!` estimates the needed capacity before writing a string][39356]
5293 * [Support unprivileged symlink creation in Windows][38921]
5294 * [`PathBuf` implements `Default`][38764]
5295 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5296 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5297 and poor hash functions.
5302 * [Add `cargo check --all`][cargo/3731]
5303 * [Add an option to ignore SSL revocation checking][cargo/3699]
5304 * [Add `cargo run --package`][cargo/3691]
5305 * [Add `required_features`][cargo/3667]
5306 * [Assume `build.rs` is a build script][cargo/3664]
5307 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5312 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5314 * [The "Unstable Book" documents nightly-only features][ubook]
5315 * [Improve the style of the sidebar in rustdoc output][40265]
5316 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5317 * [Fix MSP430 breakage due to `i128`][40257]
5318 * [Preliminary Solaris/SPARCv9 support][39903]
5319 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5320 run without installing the MSVC runtime.
5321 * [`rustdoc --test` includes file names in test names][39788]
5322 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5323 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5324 * [Initial support for `aarch64-unknown-freebsd`][39491]
5325 * [Initial support for `i686-unknown-netbsd`][39426]
5326 * [This release no longer includes the old makefile build system][39431]. Rust
5327 is built with a custom build system, written in Rust, and with Cargo.
5328 * [Add Debug implementations for libcollection structs][39002]
5329 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5330 * [`--test-threads=0` produces an error][38945]
5331 * [`rustup` installs documentation by default][40526]
5332 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5333 WinDbg and Visual Studio to improve the debugging experience.
5338 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5339 workaround, either use MSVC 2015 or run vcvars.bat.
5340 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5341 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5342 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5344 * [`format!` and `Display::to_string` panic if an underlying formatting
5345 implementation returns an error][40117]. Previously the error was silently
5346 ignored. It is incorrect for `write_fmt` to return an error when writing
5348 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5349 crates were marked stable and could be accessed from the stable toolchain.
5350 * [Rust git source no longer includes vendored crates][39728]. Those that need
5351 to build with vendored crates should build from release tarballs.
5352 * [Fix inert attributes from `proc_macro_derives`][39572]
5353 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5354 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5356 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5357 existing code generally ignores the type of dead-code unless a type-hint is
5358 provided; this can cause surprising inference interactions particularly around
5359 defaulting. The new code uniformly ignores the result type of dead-code.
5360 * [Tuple-struct constructors with private fields are no longer visible][38932]
5361 * [Lifetime parameters that do not appear in the arguments are now considered
5362 early-bound][38897], resolving a soundness bug (#[32330]). The
5363 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5365 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5366 * [Make transmuting from fn item types to pointer-sized types a hard
5369 [27787]: https://github.com/rust-lang/rust/issues/27787
5370 [32330]: https://github.com/rust-lang/rust/issues/32330
5371 [34198]: https://github.com/rust-lang/rust/pull/34198
5372 [38161]: https://github.com/rust-lang/rust/pull/38161
5373 [38368]: https://github.com/rust-lang/rust/pull/38368
5374 [38584]: https://github.com/rust-lang/rust/issues/38584
5375 [38661]: https://github.com/rust-lang/rust/pull/38661
5376 [38764]: https://github.com/rust-lang/rust/pull/38764
5377 [38864]: https://github.com/rust-lang/rust/issues/38864
5378 [38897]: https://github.com/rust-lang/rust/pull/38897
5379 [38921]: https://github.com/rust-lang/rust/pull/38921
5380 [38932]: https://github.com/rust-lang/rust/pull/38932
5381 [38945]: https://github.com/rust-lang/rust/pull/38945
5382 [38981]: https://github.com/rust-lang/rust/pull/38981
5383 [39002]: https://github.com/rust-lang/rust/pull/39002
5384 [39116]: https://github.com/rust-lang/rust/pull/39116
5385 [39193]: https://github.com/rust-lang/rust/pull/39193
5386 [39265]: https://github.com/rust-lang/rust/pull/39265
5387 [39356]: https://github.com/rust-lang/rust/pull/39356
5388 [39372]: https://github.com/rust-lang/rust/pull/39372
5389 [39426]: https://github.com/rust-lang/rust/pull/39426
5390 [39431]: https://github.com/rust-lang/rust/pull/39431
5391 [39438]: https://github.com/rust-lang/rust/pull/39438
5392 [39440]: https://github.com/rust-lang/rust/pull/39440
5393 [39485]: https://github.com/rust-lang/rust/pull/39485
5394 [39491]: https://github.com/rust-lang/rust/pull/39491
5395 [39518]: https://github.com/rust-lang/rust/pull/39518
5396 [39538]: https://github.com/rust-lang/rust/pull/39538
5397 [39572]: https://github.com/rust-lang/rust/pull/39572
5398 [39633]: https://github.com/rust-lang/rust/pull/39633
5399 [39642]: https://github.com/rust-lang/rust/pull/39642
5400 [39728]: https://github.com/rust-lang/rust/pull/39728
5401 [39761]: https://github.com/rust-lang/rust/pull/39761
5402 [39788]: https://github.com/rust-lang/rust/pull/39788
5403 [39793]: https://github.com/rust-lang/rust/pull/39793
5404 [39837]: https://github.com/rust-lang/rust/pull/39837
5405 [39843]: https://github.com/rust-lang/rust/pull/39843
5406 [39851]: https://github.com/rust-lang/rust/pull/39851
5407 [39903]: https://github.com/rust-lang/rust/pull/39903
5408 [39939]: https://github.com/rust-lang/rust/pull/39939
5409 [39953]: https://github.com/rust-lang/rust/pull/39953
5410 [39960]: https://github.com/rust-lang/rust/pull/39960
5411 [39990]: https://github.com/rust-lang/rust/pull/39990
5412 [39995]: https://github.com/rust-lang/rust/pull/39995
5413 [40008]: https://github.com/rust-lang/rust/pull/40008
5414 [40009]: https://github.com/rust-lang/rust/pull/40009
5415 [40027]: https://github.com/rust-lang/rust/pull/40027
5416 [40028]: https://github.com/rust-lang/rust/pull/40028
5417 [40037]: https://github.com/rust-lang/rust/pull/40037
5418 [40117]: https://github.com/rust-lang/rust/pull/40117
5419 [40166]: https://github.com/rust-lang/rust/pull/40166
5420 [40245]: https://github.com/rust-lang/rust/pull/40245
5421 [40257]: https://github.com/rust-lang/rust/pull/40257
5422 [40261]: https://github.com/rust-lang/rust/pull/40261
5423 [40265]: https://github.com/rust-lang/rust/pull/40265
5424 [40319]: https://github.com/rust-lang/rust/pull/40319
5425 [40336]: https://github.com/rust-lang/rust/pull/40336
5426 [40526]: https://github.com/rust-lang/rust/pull/40526
5427 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5428 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5429 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5430 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5431 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5432 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5433 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5434 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5435 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5436 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5437 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5438 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5439 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5440 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5441 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5442 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5443 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5444 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5445 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5446 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5447 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5448 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5449 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5450 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5451 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5452 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5453 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5454 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5455 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5456 [mdbook]: https://crates.io/crates/mdbook
5457 [ubook]: https://doc.rust-lang.org/unstable-book/
5460 Version 1.16.0 (2017-03-16)
5461 ===========================
5466 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5467 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5468 match patterns][38069]
5469 * [Clean up semantics of `self` in an import list][38313]
5470 * [`Self` may appear in `impl` headers][38920]
5471 * [`Self` may appear in struct expressions][39282]
5476 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5477 a `.rmeta` file containing only crate metadata][38571]. This can be
5478 used by tools like the Rust Language Service to perform
5479 metadata-only builds.
5480 * [Levenshtein based typo suggestions now work in most places, while
5481 previously they worked only for fields and sometimes for local
5482 variables][38927]. Together with the overhaul of "no
5483 resolution"/"unexpected resolution" errors (#[38154]) they result in
5484 large and systematic improvement in resolution diagnostics.
5485 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5487 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5488 * [`rustc` no longer attempts to provide "consider using an explicit
5489 lifetime" suggestions][37057]. They were inaccurate.
5494 * [`VecDeque::truncate`]
5495 * [`VecDeque::resize`]
5496 * [`String::insert_str`]
5497 * [`Duration::checked_add`]
5498 * [`Duration::checked_sub`]
5499 * [`Duration::checked_div`]
5500 * [`Duration::checked_mul`]
5503 * [`SocketAddr::is_ipv4`]
5504 * [`SocketAddr::is_ipv6`]
5505 * [`IpAddr::is_ipv4`]
5506 * [`IpAddr::is_ipv6`]
5508 * [`Vec::dedup_by_key`]
5509 * [`Result::unwrap_or_default`]
5510 * [`<*const T>::wrapping_offset`]
5511 * [`<*mut T>::wrapping_offset`]
5512 * `CommandExt::creation_flags`
5513 * [`File::set_permissions`]
5514 * [`String::split_off`]
5519 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5520 their argument by `Borrow` parameter][37761]
5521 * [All public types in std implement `Debug`][38006]
5522 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5523 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5524 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5526 * [std: Fix partial writes in `LineWriter`][38062]
5527 * [std: Clamp max read/write sizes on Unix][38062]
5528 * [Use more specific panic message for `&str` slicing errors][38066]
5529 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5530 functionality cannot be achieved in std currently.
5531 * [`writeln!`, like `println!`, now accepts a form with no string
5532 or formatting arguments, to just print a newline][38469]
5533 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5534 * [Reduce the size of static data in `std_unicode::tables`][38781]
5535 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5536 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5538 * [`Duration` implements `Sum`][38712]
5539 * [`String` implements `ToSocketAddrs`][39048]
5544 * [The `cargo check` command does a type check of a project without
5545 building it][cargo/3296]
5546 * [crates.io will display CI badges from Travis and AppVeyor, if
5547 specified in Cargo.toml][cargo/3546]
5548 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5549 * [Compilation profiles accept integer values for `debug`, in addition
5550 to `true` and `false`. These are passed to `rustc` as the value to
5551 `-C debuginfo`][cargo/3534]
5552 * [Implement `cargo --version --verbose`][cargo/3604]
5553 * [All builds now output 'dep-info' build dependencies compatible with
5554 make and ninja][cargo/3557]
5555 * [Build all workspace members with `build --all`][cargo/3511]
5556 * [Document all workspace members with `doc --all`][cargo/3515]
5557 * [Path deps outside workspace are not members][cargo/3443]
5562 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5563 the path to the Rust implementation][38589]
5564 * [The `armv7-linux-androideabi` target no longer enables NEON
5565 extensions, per Google's ABI guide][38413]
5566 * [The stock standard library can be compiled for Redox OS][38401]
5567 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5569 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5571 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5576 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5577 match patterns][38069]
5578 * In this release, references to uninhabited types can not be
5579 pattern-matched. This was accidentally allowed in 1.15.
5580 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5581 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5583 * [Clean up semantics of `self` in an import list][38313]
5584 * Reimplemented lifetime elision. This change was almost entirely compatible
5585 with existing code, but it did close a number of small bugs and loopholes,
5586 as well as being more accepting in some other [cases][41105].
5588 [37057]: https://github.com/rust-lang/rust/pull/37057
5589 [37761]: https://github.com/rust-lang/rust/pull/37761
5590 [38006]: https://github.com/rust-lang/rust/pull/38006
5591 [38051]: https://github.com/rust-lang/rust/pull/38051
5592 [38062]: https://github.com/rust-lang/rust/pull/38062
5593 [38062]: https://github.com/rust-lang/rust/pull/38622
5594 [38066]: https://github.com/rust-lang/rust/pull/38066
5595 [38069]: https://github.com/rust-lang/rust/pull/38069
5596 [38131]: https://github.com/rust-lang/rust/pull/38131
5597 [38154]: https://github.com/rust-lang/rust/pull/38154
5598 [38274]: https://github.com/rust-lang/rust/pull/38274
5599 [38304]: https://github.com/rust-lang/rust/pull/38304
5600 [38313]: https://github.com/rust-lang/rust/pull/38313
5601 [38314]: https://github.com/rust-lang/rust/pull/38314
5602 [38327]: https://github.com/rust-lang/rust/pull/38327
5603 [38401]: https://github.com/rust-lang/rust/pull/38401
5604 [38413]: https://github.com/rust-lang/rust/pull/38413
5605 [38469]: https://github.com/rust-lang/rust/pull/38469
5606 [38559]: https://github.com/rust-lang/rust/pull/38559
5607 [38571]: https://github.com/rust-lang/rust/pull/38571
5608 [38580]: https://github.com/rust-lang/rust/pull/38580
5609 [38589]: https://github.com/rust-lang/rust/pull/38589
5610 [38670]: https://github.com/rust-lang/rust/pull/38670
5611 [38712]: https://github.com/rust-lang/rust/pull/38712
5612 [38726]: https://github.com/rust-lang/rust/pull/38726
5613 [38781]: https://github.com/rust-lang/rust/pull/38781
5614 [38798]: https://github.com/rust-lang/rust/pull/38798
5615 [38909]: https://github.com/rust-lang/rust/pull/38909
5616 [38920]: https://github.com/rust-lang/rust/pull/38920
5617 [38927]: https://github.com/rust-lang/rust/pull/38927
5618 [39048]: https://github.com/rust-lang/rust/pull/39048
5619 [39282]: https://github.com/rust-lang/rust/pull/39282
5620 [39379]: https://github.com/rust-lang/rust/pull/39379
5621 [41105]: https://github.com/rust-lang/rust/issues/41105
5622 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5623 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5624 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5625 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5626 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5627 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5628 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5629 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5630 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5631 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5632 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5633 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5634 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5635 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5636 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5637 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5638 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5639 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5640 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5641 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5642 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5643 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5644 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5645 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5646 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5647 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5648 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5649 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5650 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5651 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5654 Version 1.15.1 (2017-02-09)
5655 ===========================
5657 * [Fix IntoIter::as_mut_slice's signature][39466]
5658 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5660 [39466]: https://github.com/rust-lang/rust/pull/39466
5661 [39523]: https://github.com/rust-lang/rust/pull/39523
5664 Version 1.15.0 (2017-02-02)
5665 ===========================
5670 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5671 stable. This allows popular code-generating crates like Serde and Diesel to
5672 work ergonomically. [RFC 1681].
5673 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5674 with curly braces][36868]. Part of [RFC 1506].
5675 * [A number of minor changes to name resolution have been activated][37127].
5676 They add up to more consistent semantics, allowing for future evolution of
5677 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5678 details of what is different. The breaking changes here have been transitioned
5679 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5680 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5682 * [`?Sized` can be used in `where` clauses][37791]
5683 * [There is now a limit on the size of monomorphized types and it can be
5684 modified with the `#![type_size_limit]` crate attribute, similarly to
5685 the `#![recursion_limit]` attribute][37789]
5690 * [On Windows, the compiler will apply dllimport attributes when linking to
5691 extern functions][37973]. Additional attributes and flags can control which
5692 library kind is linked and its name. [RFC 1717].
5693 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5694 * [The `--test` flag works with procedural macro crates][38107]
5695 * [Fix `extern "aapcs" fn` ABI][37814]
5696 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5697 * [The `format!` expander recognizes incorrect `printf` and shell-style
5698 formatting directives and suggests the correct format][37613].
5699 * [Only report one error for all unused imports in an import list][37456]
5701 Compiler Performance
5702 --------------------
5704 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5705 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5706 * [Don't clone in `UnificationTable::probe`][37848]
5707 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5708 * [Use small vectors in type walker][37760]
5709 * [Macro expansion performance was improved][37701]
5710 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5711 * [Replace FNV with a faster hash function][37229]
5716 * [`std::iter::Iterator::min_by`]
5717 * [`std::iter::Iterator::max_by`]
5718 * [`std::os::*::fs::FileExt`]
5719 * [`std::sync::atomic::Atomic*::get_mut`]
5720 * [`std::sync::atomic::Atomic*::into_inner`]
5721 * [`std::vec::IntoIter::as_slice`]
5722 * [`std::vec::IntoIter::as_mut_slice`]
5723 * [`std::sync::mpsc::Receiver::try_iter`]
5724 * [`std::os::unix::process::CommandExt::before_exec`]
5725 * [`std::rc::Rc::strong_count`]
5726 * [`std::rc::Rc::weak_count`]
5727 * [`std::sync::Arc::strong_count`]
5728 * [`std::sync::Arc::weak_count`]
5729 * [`std::char::encode_utf8`]
5730 * [`std::char::encode_utf16`]
5731 * [`std::cell::Ref::clone`]
5732 * [`std::io::Take::into_inner`]
5737 * [The standard sorting algorithm has been rewritten for dramatic performance
5738 improvements][38192]. It is a hybrid merge sort, drawing influences from
5739 Timsort. Previously it was a naive merge sort.
5740 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5741 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5743 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5744 and `char_indices().last()`][37882]
5745 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5746 * [Chinese characters display correctly in `fmt::Debug`][37855]
5747 * [Derive `Default` for `Duration`][37699]
5748 * [Support creation of anonymous pipes on WinXP/2k][37677]
5749 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5750 * [Don't pass overlapped handles to processes][38835]
5755 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5756 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5757 should instead check the variable at runtime with `std::env`. That the value
5758 was set at build time was a bug, and incorrect when cross-compiling. This
5759 change is known to cause breakage.
5760 * [Add `--all` flag to `cargo test`][cargo/3221]
5761 * [Compile statically against the MSVC CRT][cargo/3363]
5762 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5763 * [Link OpenSSL statically on OSX][cargo/3311]
5764 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5765 * [Test for bad path overrides with summaries][cargo/3336]
5766 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5767 * [Fix retrying crate downloads for network errors][cargo/3348]
5768 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5769 * [Emit more info on --message-format=json][cargo/3319]
5770 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5771 * [Don't ignore errors in workspace manifest][cargo/3409]
5772 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5777 * [Test runners (binaries built with `--test`) now support a `--list` argument
5778 that lists the tests it contains][38185]
5779 * [Test runners now support a `--exact` argument that makes the test filter
5780 match exactly, instead of matching only a substring of the test name][38181]
5781 * [rustdoc supports a `--playground-url` flag][37763]
5782 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5787 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5788 continue to be used in this release by passing `--disable-rustbuild` to the
5789 configure script, but they will be deleted soon. Note that the new build
5790 system uses a different on-disk layout that will likely affect any scripts
5792 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5794 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5795 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5801 * [A number of minor changes to name resolution have been activated][37127].
5802 They add up to more consistent semantics, allowing for future evolution of
5803 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5804 details of what is different. The breaking changes here have been transitioned
5805 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5806 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5807 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5808 should instead check the variable at runtime with `std::env`. That the value
5809 was set at build time was a bug, and incorrect when cross-compiling. This
5810 change is known to cause breakage.
5811 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5812 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5813 1.10 and is now an error by default. It will become a hard error in the near
5815 * [The semantics relating modules to file system directories are changing in
5816 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5817 lint, which is a warning in this release, and will become a hard error in the
5819 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5820 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5821 the underlying iterator][37834]
5823 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5824 [33685]: https://github.com/rust-lang/rust/issues/33685
5825 [36868]: https://github.com/rust-lang/rust/pull/36868
5826 [37127]: https://github.com/rust-lang/rust/pull/37127
5827 [37229]: https://github.com/rust-lang/rust/pull/37229
5828 [37456]: https://github.com/rust-lang/rust/pull/37456
5829 [37527]: https://github.com/rust-lang/rust/pull/37527
5830 [37602]: https://github.com/rust-lang/rust/pull/37602
5831 [37613]: https://github.com/rust-lang/rust/pull/37613
5832 [37615]: https://github.com/rust-lang/rust/pull/37615
5833 [37636]: https://github.com/rust-lang/rust/pull/37636
5834 [37627]: https://github.com/rust-lang/rust/pull/37627
5835 [37642]: https://github.com/rust-lang/rust/pull/37642
5836 [37677]: https://github.com/rust-lang/rust/pull/37677
5837 [37699]: https://github.com/rust-lang/rust/pull/37699
5838 [37701]: https://github.com/rust-lang/rust/pull/37701
5839 [37705]: https://github.com/rust-lang/rust/pull/37705
5840 [37749]: https://github.com/rust-lang/rust/pull/37749
5841 [37760]: https://github.com/rust-lang/rust/pull/37760
5842 [37763]: https://github.com/rust-lang/rust/pull/37763
5843 [37764]: https://github.com/rust-lang/rust/pull/37764
5844 [37789]: https://github.com/rust-lang/rust/pull/37789
5845 [37791]: https://github.com/rust-lang/rust/pull/37791
5846 [37814]: https://github.com/rust-lang/rust/pull/37814
5847 [37817]: https://github.com/rust-lang/rust/pull/37817
5848 [37834]: https://github.com/rust-lang/rust/pull/37834
5849 [37848]: https://github.com/rust-lang/rust/pull/37848
5850 [37855]: https://github.com/rust-lang/rust/pull/37855
5851 [37882]: https://github.com/rust-lang/rust/pull/37882
5852 [37888]: https://github.com/rust-lang/rust/pull/37888
5853 [37973]: https://github.com/rust-lang/rust/pull/37973
5854 [37979]: https://github.com/rust-lang/rust/pull/37979
5855 [38086]: https://github.com/rust-lang/rust/pull/38086
5856 [38107]: https://github.com/rust-lang/rust/pull/38107
5857 [38117]: https://github.com/rust-lang/rust/pull/38117
5858 [38134]: https://github.com/rust-lang/rust/pull/38134
5859 [38146]: https://github.com/rust-lang/rust/pull/38146
5860 [38181]: https://github.com/rust-lang/rust/pull/38181
5861 [38182]: https://github.com/rust-lang/rust/pull/38182
5862 [38185]: https://github.com/rust-lang/rust/pull/38185
5863 [38192]: https://github.com/rust-lang/rust/pull/38192
5864 [38279]: https://github.com/rust-lang/rust/pull/38279
5865 [38835]: https://github.com/rust-lang/rust/pull/38835
5866 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5867 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5868 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5869 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5870 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5871 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5872 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5873 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5874 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5875 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5876 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5877 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5878 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5879 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5880 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5881 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5882 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5883 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5884 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5885 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5886 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5887 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5888 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5889 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5890 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5891 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5892 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5893 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5894 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5895 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5896 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5897 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5898 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5899 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5900 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5901 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5902 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5903 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5906 Version 1.14.0 (2016-12-22)
5907 ===========================
5912 * [`..` matches multiple tuple fields in enum variants, structs
5913 and tuples][36843]. [RFC 1492].
5914 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5915 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5916 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5917 dereferencing][36822]
5922 * [Mark enums with non-zero discriminant as non-zero][37224]
5923 * [Lower-case `static mut` names are linted like other
5924 statics and consts][37162]
5925 * [Fix ICE on some macros in const integer positions
5926 (e.g. `[u8; m!()]`)][36819]
5927 * [Improve error message and snippet for "did you mean `x`"][36798]
5928 * [Add a panic-strategy field to the target specification][36794]
5929 * [Include LLVM version in `--version --verbose`][37200]
5931 Compile-time Optimizations
5932 --------------------------
5934 * [Improve macro expansion performance][37569]
5935 * [Shrink `Expr_::ExprInlineAsm`][37445]
5936 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5937 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5938 * [Avoid more allocations when compiling html5ever][37373]
5939 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5940 * [Avoid some allocations in the macro parser][37318]
5941 * [Use a faster deflate setting][37298]
5942 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5943 during interning of slices][37270]
5944 * [Optimize `write_metadata`][37267]
5945 * [Don't process obligation forest cycles when stalled][37231]
5946 * [Avoid many `CrateConfig` clones][37161]
5947 * [Optimize `Substs::super_fold_with`][37108]
5948 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5949 * [Speed up `plug_leaks`][36917]
5954 * [`println!()`, with no arguments, prints newline][36825].
5955 Previously, an empty string was required to achieve the same.
5956 * [`Wrapping` impls standard binary and unary operators, as well as
5957 the `Sum` and `Product` iterators][37356]
5958 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5960 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5961 `VecDeque` iterators][37315]
5962 * [Improve `SipHasher` performance on small values][37312]
5963 * [Add Iterator trait TrustedLen to enable better FromIterator /
5965 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5966 * [`ReadDir` implements `Debug`][37221]
5967 * [Implement `RefUnwindSafe` for atomic types][37178]
5968 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5969 * [Avoid allocations in `Decoder::read_str`][37064]
5970 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5971 * [Impl `Debug` for raw pointers to unsized data][36880]
5972 * [Don't reuse `HashMap` random seeds][37470]
5973 * [The internal memory layout of `HashMap` is more cache-friendly, for
5974 significant improvements in some operations][36692]
5975 * [`HashMap` uses less memory on 32-bit architectures][36595]
5976 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5981 * [Expose rustc cfg values to build scripts][cargo/3243]
5982 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5983 * [Fix passing --features when testing multiple packages][cargo/3280]
5984 * [Use a single profile set per workspace][cargo/3249]
5985 * [Load `replace` sections from lock files][cargo/3220]
5986 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5991 * [rustup is the recommended Rust installation method][1.14rustup]
5992 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5993 S390x. These are [tier 2] platforms and may have major defects. Follow the
5994 instructions on the website to install, or add the targets to an existing
5995 installation with `rustup target add`. The new target triples are:
5996 - `mips-unknown-linux-gnu`
5997 - `mipsel-unknown-linux-gnu`
5998 - `mips64-unknown-linux-gnuabi64`
5999 - `mips64el-unknown-linux-gnuabi64 `
6000 - `powerpc-unknown-linux-gnu`
6001 - `powerpc64-unknown-linux-gnu`
6002 - `powerpc64le-unknown-linux-gnu`
6003 - `s390x-unknown-linux-gnu `
6004 * This release includes target (std) builds for ARM Linux running MUSL
6005 libc. These are [tier 2] platforms and may have major defects. Add the
6006 following triples to an existing rustup installation with `rustup target add`:
6007 - `arm-unknown-linux-musleabi`
6008 - `arm-unknown-linux-musleabihf`
6009 - `armv7-unknown-linux-musleabihf`
6010 * This release includes [experimental support for WebAssembly][1.14wasm], via
6011 the `wasm32-unknown-emscripten` target. This target is known to have major
6012 defects. Please test, report, and fix.
6013 * rustup no longer installs documentation by default. Run `rustup
6014 component add rust-docs` to install.
6015 * [Fix line stepping in debugger][37310]
6016 * [Enable line number debuginfo in releases][37280]
6021 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6022 * [Add support for Fuchsia OS][37313]
6023 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6028 * [A number of forward-compatibility lints used by the compiler
6029 to gradually introduce language changes have been converted
6030 to deny by default][36894]:
6031 - ["use of inaccessible extern crate erroneously allowed"][36886]
6032 - ["type parameter default erroneously allowed in invalid location"][36887]
6033 - ["detects super or self keywords at the beginning of global path"][36888]
6034 - ["two overlapping inherent impls define an item with the same name
6035 were erroneously allowed"][36889]
6036 - ["floating-point constants cannot be used in patterns"][36890]
6037 - ["constants of struct or enum type can only be used in a pattern if
6038 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6039 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6040 * [Prohibit patterns in trait methods without bodies][37378]
6041 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6042 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6043 * [The `$crate` macro variable is accepted in fewer locations][37213]
6044 * [Impls specifying extra region requirements beyond the trait
6045 they implement are rejected][37167]
6046 * [Enums may not be unsized][37111]. Unsized enums are intended to
6047 work but never have. For now they are forbidden.
6048 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6050 [tier 2]: https://forge.rust-lang.org/platform-support.html
6051 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6052 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6053 [36430]: https://github.com/rust-lang/rust/pull/36430
6054 [36595]: https://github.com/rust-lang/rust/pull/36595
6055 [36595]: https://github.com/rust-lang/rust/pull/36595
6056 [36692]: https://github.com/rust-lang/rust/pull/36692
6057 [36767]: https://github.com/rust-lang/rust/pull/36767
6058 [36794]: https://github.com/rust-lang/rust/pull/36794
6059 [36798]: https://github.com/rust-lang/rust/pull/36798
6060 [36819]: https://github.com/rust-lang/rust/pull/36819
6061 [36822]: https://github.com/rust-lang/rust/pull/36822
6062 [36825]: https://github.com/rust-lang/rust/pull/36825
6063 [36843]: https://github.com/rust-lang/rust/pull/36843
6064 [36880]: https://github.com/rust-lang/rust/pull/36880
6065 [36886]: https://github.com/rust-lang/rust/issues/36886
6066 [36887]: https://github.com/rust-lang/rust/issues/36887
6067 [36888]: https://github.com/rust-lang/rust/issues/36888
6068 [36889]: https://github.com/rust-lang/rust/issues/36889
6069 [36890]: https://github.com/rust-lang/rust/issues/36890
6070 [36891]: https://github.com/rust-lang/rust/issues/36891
6071 [36892]: https://github.com/rust-lang/rust/issues/36892
6072 [36894]: https://github.com/rust-lang/rust/pull/36894
6073 [36917]: https://github.com/rust-lang/rust/pull/36917
6074 [36993]: https://github.com/rust-lang/rust/pull/36993
6075 [37037]: https://github.com/rust-lang/rust/pull/37037
6076 [37064]: https://github.com/rust-lang/rust/pull/37064
6077 [37094]: https://github.com/rust-lang/rust/pull/37094
6078 [37108]: https://github.com/rust-lang/rust/pull/37108
6079 [37111]: https://github.com/rust-lang/rust/pull/37111
6080 [37161]: https://github.com/rust-lang/rust/pull/37161
6081 [37162]: https://github.com/rust-lang/rust/pull/37162
6082 [37167]: https://github.com/rust-lang/rust/pull/37167
6083 [37178]: https://github.com/rust-lang/rust/pull/37178
6084 [37200]: https://github.com/rust-lang/rust/pull/37200
6085 [37213]: https://github.com/rust-lang/rust/pull/37213
6086 [37221]: https://github.com/rust-lang/rust/pull/37221
6087 [37224]: https://github.com/rust-lang/rust/pull/37224
6088 [37230]: https://github.com/rust-lang/rust/pull/37230
6089 [37231]: https://github.com/rust-lang/rust/pull/37231
6090 [37247]: https://github.com/rust-lang/rust/pull/37247
6091 [37267]: https://github.com/rust-lang/rust/pull/37267
6092 [37270]: https://github.com/rust-lang/rust/pull/37270
6093 [37273]: https://github.com/rust-lang/rust/pull/37273
6094 [37280]: https://github.com/rust-lang/rust/pull/37280
6095 [37298]: https://github.com/rust-lang/rust/pull/37298
6096 [37306]: https://github.com/rust-lang/rust/pull/37306
6097 [37310]: https://github.com/rust-lang/rust/pull/37310
6098 [37312]: https://github.com/rust-lang/rust/pull/37312
6099 [37313]: https://github.com/rust-lang/rust/pull/37313
6100 [37315]: https://github.com/rust-lang/rust/pull/37315
6101 [37318]: https://github.com/rust-lang/rust/pull/37318
6102 [37322]: https://github.com/rust-lang/rust/pull/37322
6103 [37326]: https://github.com/rust-lang/rust/pull/37326
6104 [37351]: https://github.com/rust-lang/rust/pull/37351
6105 [37356]: https://github.com/rust-lang/rust/pull/37356
6106 [37367]: https://github.com/rust-lang/rust/pull/37367
6107 [37373]: https://github.com/rust-lang/rust/pull/37373
6108 [37378]: https://github.com/rust-lang/rust/pull/37378
6109 [37389]: https://github.com/rust-lang/rust/pull/37389
6110 [37392]: https://github.com/rust-lang/rust/pull/37392
6111 [37427]: https://github.com/rust-lang/rust/pull/37427
6112 [37439]: https://github.com/rust-lang/rust/pull/37439
6113 [37445]: https://github.com/rust-lang/rust/pull/37445
6114 [37470]: https://github.com/rust-lang/rust/pull/37470
6115 [37569]: https://github.com/rust-lang/rust/pull/37569
6116 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6117 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6118 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6119 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6120 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6121 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6122 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6125 Version 1.13.0 (2016-11-10)
6126 ===========================
6131 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6132 errors, like the `try!` macro, described in [RFC 0243].
6133 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6134 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6135 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6136 * [Fix lifetime rules for 'if' conditions][36029]
6137 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6142 * [Add the `-C link-arg` argument][36574]
6143 * [Remove the old AST-based backend from rustc_trans][35764]
6144 * [Don't enable NEON by default on armv7 Linux][35814]
6145 * [Fix debug line number info for macro expansions][35238]
6146 * [Do not emit "class method" debuginfo for types that are not
6147 DICompositeType][36008]
6148 * [Warn about multiple conflicting #[repr] hints][34623]
6149 * [When sizing DST, don't double-count nested struct prefixes][36351]
6150 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6151 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6152 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6153 * [Expand macros without recursing to avoid stack overflows][36214]
6158 * [Replace macro backtraces with labeled local uses][35702]
6159 * [Improve error message for misplaced doc comments][33922]
6160 * [Buffer unix and lock windows to prevent message interleaving][35975]
6161 * [Update lifetime errors to specifically note temporaries][36171]
6162 * [Special case a few colors for Windows][36178]
6163 * [Suggest `use self` when such an import resolves][36289]
6164 * [Be more specific when type parameter shadows primitive type][36338]
6165 * Many minor improvements
6167 Compile-time Optimizations
6168 --------------------------
6170 * [Compute and cache HIR hashes at beginning][35854]
6171 * [Don't hash types in loan paths][36004]
6172 * [Cache projections in trans][35761]
6173 * [Optimize the parser's last token handling][36527]
6174 * [Only instantiate #[inline] functions in codegen units referencing
6175 them][36524]. This leads to big improvements in cases where crates export
6176 define many inline functions without using them directly.
6177 * [Lazily allocate TypedArena's first chunk][36592]
6178 * [Don't allocate during default HashSet creation][36734]
6185 * [`overflowing_abs`]
6186 * [`RefCell::try_borrow`]
6187 * [`RefCell::try_borrow_mut`]
6192 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6193 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6195 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6196 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6197 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6198 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6199 * [Use arc4rand on FreeBSD][35884]
6200 * [memrchr: Correct aligned offset computation][35969]
6201 * [Improve Demangling of Rust Symbols][36059]
6202 * [Use monotonic time in condition variables][35048]
6203 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6204 * [Implement conversion traits for `char`][35755]
6205 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6206 * [Zero first byte of CString on drop][36264]
6207 * [Inherit overflow checks for sum and product][36372]
6208 * [Add missing Eq implementations][36423]
6209 * [Implement `Debug` for `DirEntry`][36631]
6210 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6212 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6213 * [Implement more traits for `std::io::ErrorKind`][35911]
6214 * [Optimize BinaryHeap bounds checking][36072]
6215 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6216 `extend_with_element`][36355]
6217 * [Fix overflow checking in unsigned pow()][34942]
6222 * This release includes security fixes to both curl and OpenSSL.
6223 * [Fix transitive doctests when panic=abort][cargo/3021]
6224 * [Add --all-features flag to cargo][cargo/3038]
6225 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6226 * [Don't parse the home directory more than once][cargo/3078]
6227 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6228 * [Update OpenSSL to 1.0.2j][cargo/3121]
6229 * [Add license and license_file to cargo metadata output][cargo/3110]
6230 * [Make crates-io registry URL optional in config; ignore all changes to
6231 source.crates-io][cargo/3089]
6232 * [Don't download dependencies from other platforms][cargo/3123]
6233 * [Build transitive dev-dependencies when needed][cargo/3125]
6234 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6235 * [Avoid updating registry when adding existing deps][cargo/3144]
6236 * [Warn about path overrides that won't work][cargo/3136]
6237 * [Use workspaces during `cargo install`][cargo/3146]
6238 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6239 * [Add --message-format flag][cargo/3000]
6240 * [Pass target environment for rustdoc][cargo/3205]
6241 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6242 * [Update curl and curl-sys][cargo/3241]
6243 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6248 * [rustdoc: Add the `--sysroot` argument][36586]
6249 * [rustdoc: Fix a couple of issues with the search results][35655]
6250 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6251 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6252 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6257 * [Remove unmaintained style guide][35124]
6258 * [Add s390x support][36369]
6259 * [Initial work at Haiku OS support][36727]
6260 * [Add mips-uclibc targets][35734]
6261 * [Crate-ify compiler-rt into compiler-builtins][35021]
6262 * [Add rustc version info (git hash + date) to dist tarball][36213]
6263 * Many documentation improvements
6268 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6269 * [Deny (by default) transmuting from fn item types to pointer-sized
6270 types][34923]. Continuing the long transition to zero-sized fn items,
6272 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6274 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6275 * [Fix lifetime rules for 'if' conditions][36029].
6276 * [Inherit overflow checks for sum and product][36372].
6277 * [Forbid user-defined macros named "macro_rules"][36730].
6279 [33922]: https://github.com/rust-lang/rust/pull/33922
6280 [34623]: https://github.com/rust-lang/rust/pull/34623
6281 [34923]: https://github.com/rust-lang/rust/pull/34923
6282 [34942]: https://github.com/rust-lang/rust/pull/34942
6283 [34982]: https://github.com/rust-lang/rust/pull/34982
6284 [35021]: https://github.com/rust-lang/rust/pull/35021
6285 [35048]: https://github.com/rust-lang/rust/pull/35048
6286 [35074]: https://github.com/rust-lang/rust/pull/35074
6287 [35124]: https://github.com/rust-lang/rust/pull/35124
6288 [35234]: https://github.com/rust-lang/rust/pull/35234
6289 [35238]: https://github.com/rust-lang/rust/pull/35238
6290 [35354]: https://github.com/rust-lang/rust/pull/35354
6291 [35559]: https://github.com/rust-lang/rust/pull/35559
6292 [35585]: https://github.com/rust-lang/rust/pull/35585
6293 [35627]: https://github.com/rust-lang/rust/pull/35627
6294 [35655]: https://github.com/rust-lang/rust/pull/35655
6295 [35702]: https://github.com/rust-lang/rust/pull/35702
6296 [35707]: https://github.com/rust-lang/rust/pull/35707
6297 [35728]: https://github.com/rust-lang/rust/pull/35728
6298 [35734]: https://github.com/rust-lang/rust/pull/35734
6299 [35755]: https://github.com/rust-lang/rust/pull/35755
6300 [35761]: https://github.com/rust-lang/rust/pull/35761
6301 [35764]: https://github.com/rust-lang/rust/pull/35764
6302 [35814]: https://github.com/rust-lang/rust/pull/35814
6303 [35854]: https://github.com/rust-lang/rust/pull/35854
6304 [35871]: https://github.com/rust-lang/rust/pull/35871
6305 [35884]: https://github.com/rust-lang/rust/pull/35884
6306 [35911]: https://github.com/rust-lang/rust/pull/35911
6307 [35969]: https://github.com/rust-lang/rust/pull/35969
6308 [35975]: https://github.com/rust-lang/rust/pull/35975
6309 [36004]: https://github.com/rust-lang/rust/pull/36004
6310 [36008]: https://github.com/rust-lang/rust/pull/36008
6311 [36014]: https://github.com/rust-lang/rust/pull/36014
6312 [36029]: https://github.com/rust-lang/rust/pull/36029
6313 [36059]: https://github.com/rust-lang/rust/pull/36059
6314 [36072]: https://github.com/rust-lang/rust/pull/36072
6315 [36101]: https://github.com/rust-lang/rust/pull/36101
6316 [36104]: https://github.com/rust-lang/rust/pull/36104
6317 [36171]: https://github.com/rust-lang/rust/pull/36171
6318 [36173]: https://github.com/rust-lang/rust/pull/36173
6319 [36178]: https://github.com/rust-lang/rust/pull/36178
6320 [36213]: https://github.com/rust-lang/rust/pull/36213
6321 [36214]: https://github.com/rust-lang/rust/pull/36214
6322 [36264]: https://github.com/rust-lang/rust/pull/36264
6323 [36266]: https://github.com/rust-lang/rust/pull/36266
6324 [36289]: https://github.com/rust-lang/rust/pull/36289
6325 [36338]: https://github.com/rust-lang/rust/pull/36338
6326 [36351]: https://github.com/rust-lang/rust/pull/36351
6327 [36355]: https://github.com/rust-lang/rust/pull/36355
6328 [36369]: https://github.com/rust-lang/rust/pull/36369
6329 [36372]: https://github.com/rust-lang/rust/pull/36372
6330 [36423]: https://github.com/rust-lang/rust/pull/36423
6331 [36482]: https://github.com/rust-lang/rust/pull/36482
6332 [36505]: https://github.com/rust-lang/rust/pull/36505
6333 [36524]: https://github.com/rust-lang/rust/pull/36524
6334 [36527]: https://github.com/rust-lang/rust/pull/36527
6335 [36551]: https://github.com/rust-lang/rust/pull/36551
6336 [36574]: https://github.com/rust-lang/rust/pull/36574
6337 [36586]: https://github.com/rust-lang/rust/pull/36586
6338 [36592]: https://github.com/rust-lang/rust/pull/36592
6339 [36631]: https://github.com/rust-lang/rust/pull/36631
6340 [36639]: https://github.com/rust-lang/rust/pull/36639
6341 [36721]: https://github.com/rust-lang/rust/pull/36721
6342 [36727]: https://github.com/rust-lang/rust/pull/36727
6343 [36730]: https://github.com/rust-lang/rust/pull/36730
6344 [36734]: https://github.com/rust-lang/rust/pull/36734
6345 [36754]: https://github.com/rust-lang/rust/pull/36754
6346 [36995]: https://github.com/rust-lang/rust/pull/36995
6347 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6348 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6349 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6350 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6351 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6352 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6353 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6354 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6355 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6356 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6357 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6358 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6359 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6360 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6361 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6362 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6363 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6364 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6365 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6366 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6367 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6368 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6369 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6370 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6371 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6372 [rustup]: https://www.rustup.rs
6373 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6374 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6375 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6376 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6377 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6378 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6379 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6382 Version 1.12.1 (2016-10-20)
6383 ===========================
6388 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6389 * [Confusion with double negation and booleans][36856]
6390 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6391 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6392 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6393 * [Corrupted memory after updated to 1.12][36936]
6394 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6395 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6396 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6398 [36381]: https://github.com/rust-lang/rust/issues/36381
6399 [36856]: https://github.com/rust-lang/rust/issues/36856
6400 [36875]: https://github.com/rust-lang/rust/issues/36875
6401 [36924]: https://github.com/rust-lang/rust/issues/36924
6402 [36926]: https://github.com/rust-lang/rust/issues/36926
6403 [36936]: https://github.com/rust-lang/rust/issues/36936
6404 [37026]: https://github.com/rust-lang/rust/issues/37026
6405 [37112]: https://github.com/rust-lang/rust/issues/37112
6406 [37153]: https://github.com/rust-lang/rust/issues/37153
6409 Version 1.12.0 (2016-09-29)
6410 ===========================
6415 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6416 This translation pass is far simpler than the previous AST->LLVM pass, and
6417 creates opportunities to perform new optimizations directly on the MIR. It
6418 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6419 * [`rustc` presents a new, more readable error format, along with
6420 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6421 Most common editors supporting Rust have been updated to work with it. It was
6422 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6427 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6428 This translation pass is far simpler than the previous AST->LLVM pass, and
6429 creates opportunities to perform new optimizations directly on the MIR. It
6430 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6431 * [Print the Rust target name, not the LLVM target name, with
6432 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6433 * [The computation of `TypeId` is correct in some cases where it was previously
6434 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6435 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6436 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6437 `--print relocation-models`, and `--print code-models` print the available
6438 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6439 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6440 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6441 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6442 These targets produce statically-linked binaries. There are no binary release
6448 * [`rustc` presents a new, more readable error format, along with
6449 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6450 Most common editors supporting Rust have been updated to work with it. It was
6451 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6452 * [In error descriptions, references are now described in plain English,
6453 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6454 * [In error type descriptions, unknown numeric types are named `{integer}` or
6455 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6456 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6461 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6462 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6463 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6464 useful](https://github.com/rust-lang/rust/pull/34908)
6465 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6466 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6467 * [Semicolons are properly required as statement delimiters inside
6468 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6469 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6474 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6475 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6476 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6477 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6478 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6479 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6480 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6481 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6482 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6483 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6484 Both on Unix and Windows.
6485 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6486 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6487 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6488 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6489 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6490 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6491 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6492 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6497 * [The `format!` macro and friends now allow a single argument to be formatted
6498 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6499 * [The lifetime bounds on `[T]::binary_search_by` and
6500 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6501 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6502 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6503 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6504 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6505 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6506 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6507 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6508 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6509 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6510 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6511 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6512 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6513 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6514 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6515 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6516 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6517 * [`mpsc::sync_channel` `Receiver`s return any available message before
6518 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6519 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6520 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6525 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6526 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6527 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6528 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6529 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6530 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6531 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6532 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6533 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6534 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6535 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6536 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6537 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6538 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6539 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6540 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6545 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6546 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6551 * [Test binaries now support a `--test-threads` argument to specify the number
6552 of threads used to run tests, and which acts the same as the
6553 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6554 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6555 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6556 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6557 * [Rust releases now come with source packages that can be installed by rustup
6558 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6559 The resulting source code can be used by tools and IDES, located in the
6560 sysroot under `lib/rustlib/src`.
6565 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6566 * Many minor improvements to the documentation.
6567 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6572 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6573 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6574 * [When formatting strings, if "precision" is specified, the "fill",
6575 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6576 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6579 Version 1.11.0 (2016-08-18)
6580 ===========================
6585 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6586 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6587 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6588 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6593 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6594 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6595 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6596 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6597 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6598 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6599 (in libcore - previously stabilized in libstd)
6600 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6601 (in libcore - previously stabilized in libstd)
6602 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6603 (in libcore - previously stabilized in libstd)
6604 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6605 (in libcore - previously stabilized in libstd)
6606 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6607 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6608 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6609 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6614 * [The `thread_local!` macro supports multiple definitions in a single
6615 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6616 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6617 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6618 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6619 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6620 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6621 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6622 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6627 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6628 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6629 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6630 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6631 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6632 and `-vv` prints warnings for all crates.
6633 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6634 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6635 This provides room for expansion by arbitrary tools.
6636 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6637 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6638 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6639 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6640 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6641 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6642 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6647 * [Caching projections speeds up type check dramatically for some
6648 workloads](https://github.com/rust-lang/rust/pull/33816)
6649 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6650 This hasher is faster, but is believed to provide sufficient
6651 protection from collision attacks.
6652 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6657 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6658 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6659 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6660 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6661 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6666 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6667 * [When emitting debug info, rustc emits frame pointers for closures,
6668 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6669 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6670 * Many more errors have been given error codes and extended
6672 * API documentation continues to be improved, with many new examples
6677 * [rustc no longer hangs when dependencies recursively re-export
6678 submodules](https://github.com/rust-lang/rust/pull/34542)
6679 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6680 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6681 rewritten](https://github.com/rust-lang/rust/pull/33895)
6682 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6683 No targets use this yet, but it works toward AVR support.
6688 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6689 * [The new follow-set rules that place restrictions on `macro_rules!`
6690 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6691 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6692 and has been a warning since 1.10.
6693 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6694 This causes breakage in some corner cases.
6697 Version 1.10.0 (2016-07-07)
6698 ===========================
6703 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6704 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6705 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6706 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6707 * [`panic!` can be converted to a runtime abort with the
6708 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6709 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6710 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6711 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6712 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6713 Note that Cargo does not yet directly support cdylibs.
6718 * `os::windows::fs::OpenOptionsExt::access_mode`
6719 * `os::windows::fs::OpenOptionsExt::share_mode`
6720 * `os::windows::fs::OpenOptionsExt::custom_flags`
6721 * `os::windows::fs::OpenOptionsExt::attributes`
6722 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6723 * `os::unix::fs::OpenOptionsExt::custom_flags`
6724 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6725 * `Default for sync::Weak`
6726 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6727 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6728 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6729 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6730 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6731 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6732 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6733 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6734 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6735 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6736 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6737 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6738 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6739 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6740 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6741 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6742 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6743 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6744 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6745 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6746 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6747 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6748 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6749 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6750 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6751 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6752 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6753 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6754 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6755 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6756 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6757 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6758 * Read/Write/RawFd impls for `UnixStream`
6759 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6760 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6761 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6762 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6763 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6764 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6765 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6766 * RawFd impls for `UnixListener`
6767 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6768 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6769 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6770 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6771 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6772 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6773 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6774 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6775 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6776 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6777 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6778 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6779 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6780 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6781 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6782 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6783 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6784 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6785 * RawFd impls for `UnixDatagram`
6786 * `{BTree,Hash}Map::values_mut`
6787 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6792 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6793 The semantics of this minor method are subtle and probably not what
6795 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6796 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6797 will fall back to `/dev/urandom` temporarily to avoid blocking
6798 during early boot](https://github.com/rust-lang/rust/pull/33086).
6799 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6800 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6801 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6802 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6803 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6804 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6805 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6809 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6810 This controls the runtime behavior of the `panic!` macro
6811 and can be either "unwind" (the default), or "abort".
6812 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6813 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6814 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6815 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6816 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6817 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6818 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6819 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6820 By default they are retried twice, which can be customized with the
6821 `net.retry` value in `.cargo/config`.
6822 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6823 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6824 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6825 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6826 Makes it possible to install multiple crates in parallel.
6827 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6828 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6829 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6830 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6831 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6832 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6837 * [rustc memory usage was reduced by refactoring the context used for
6838 type checking](https://github.com/rust-lang/rust/pull/33425).
6839 * [Speed up creation of `HashMap`s by caching the random keys used
6840 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6841 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6842 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6843 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6844 10x faster than the previous lookup tables.
6845 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6850 * Many incremental improvements to documentation and rustdoc.
6851 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6852 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6853 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6854 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6855 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6856 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6857 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6862 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6863 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6864 * [`std` no longer prints backtraces on platforms where the running
6865 module must be loaded with `env::current_exe`, which can't be relied
6866 on](https://github.com/rust-lang/rust/pull/33554).
6867 * This release includes std binaries for the i586-unknown-linux-gnu,
6868 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6869 i586 target is for old x86 hardware without SSE2, and the armv7
6870 target is for Android running on modern ARM architectures.
6871 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6872 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6873 * [On Unix the runtime aborts by calling `libc::abort` instead of
6874 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6875 * [Rust is now bootstrapped from the previous release of Rust,
6876 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6881 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6882 * [`target_env` for Linux ARM targets is just `gnu`, not
6883 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6884 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6885 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6886 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6887 Affects how macros are parsed.
6888 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6889 * [Feature-gated attributes on macro-generated macro invocations are
6890 now rejected](https://github.com/rust-lang/rust/pull/32791).
6891 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6892 This caused some minor changes to type inference.
6895 Version 1.9.0 (2016-05-26)
6896 ==========================
6901 * The `#[deprecated]` attribute when applied to an API will generate
6902 warnings when used. The warnings may be suppressed with
6903 `#[allow(deprecated)]`. [RFC 1270].
6904 * [`fn` item types are zero sized, and each `fn` names a unique
6905 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6906 `transmute` on a `fn` type will generate a warning for a few cycles,
6907 then will be converted to an error.
6908 * [Field and method resolution understand visibility, so private
6909 fields and methods cannot prevent the proper use of public fields
6910 and methods][1.9fv].
6911 * [The parser considers unicode codepoints in the
6912 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6918 * [`std::panic::catch_unwind`] (renamed from `recover`)
6919 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6920 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6921 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6922 * [`str::is_char_boundary`]
6923 * [`<*const T>::as_ref`]
6924 * [`<*mut T>::as_ref`]
6925 * [`<*mut T>::as_mut`]
6926 * [`AsciiExt::make_ascii_uppercase`]
6927 * [`AsciiExt::make_ascii_lowercase`]
6928 * [`char::decode_utf16`]
6929 * [`char::DecodeUtf16`]
6930 * [`char::DecodeUtf16Error`]
6931 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6932 * [`BTreeSet::take`]
6933 * [`BTreeSet::replace`]
6936 * [`HashSet::replace`]
6938 * [`OsString::with_capacity`]
6939 * [`OsString::clear`]
6940 * [`OsString::capacity`]
6941 * [`OsString::reserve`]
6942 * [`OsString::reserve_exact`]
6943 * [`OsStr::is_empty`]
6945 * [`std::os::unix::thread`]
6948 * [`JoinHandleExt::as_pthread_t`]
6949 * [`JoinHandleExt::into_pthread_t`]
6950 * [`HashSet::hasher`]
6951 * [`HashMap::hasher`]
6952 * [`CommandExt::exec`]
6953 * [`File::try_clone`]
6954 * [`SocketAddr::set_ip`]
6955 * [`SocketAddr::set_port`]
6956 * [`SocketAddrV4::set_ip`]
6957 * [`SocketAddrV4::set_port`]
6958 * [`SocketAddrV6::set_ip`]
6959 * [`SocketAddrV6::set_port`]
6960 * [`SocketAddrV6::set_flowinfo`]
6961 * [`SocketAddrV6::set_scope_id`]
6962 * [`slice::copy_from_slice`]
6963 * [`ptr::read_volatile`]
6964 * [`ptr::write_volatile`]
6965 * [`OpenOptions::create_new`]
6966 * [`TcpStream::set_nodelay`]
6967 * [`TcpStream::nodelay`]
6968 * [`TcpStream::set_ttl`]
6969 * [`TcpStream::ttl`]
6970 * [`TcpStream::set_only_v6`]
6971 * [`TcpStream::only_v6`]
6972 * [`TcpStream::take_error`]
6973 * [`TcpStream::set_nonblocking`]
6974 * [`TcpListener::set_ttl`]
6975 * [`TcpListener::ttl`]
6976 * [`TcpListener::set_only_v6`]
6977 * [`TcpListener::only_v6`]
6978 * [`TcpListener::take_error`]
6979 * [`TcpListener::set_nonblocking`]
6980 * [`UdpSocket::set_broadcast`]
6981 * [`UdpSocket::broadcast`]
6982 * [`UdpSocket::set_multicast_loop_v4`]
6983 * [`UdpSocket::multicast_loop_v4`]
6984 * [`UdpSocket::set_multicast_ttl_v4`]
6985 * [`UdpSocket::multicast_ttl_v4`]
6986 * [`UdpSocket::set_multicast_loop_v6`]
6987 * [`UdpSocket::multicast_loop_v6`]
6988 * [`UdpSocket::set_multicast_ttl_v6`]
6989 * [`UdpSocket::multicast_ttl_v6`]
6990 * [`UdpSocket::set_ttl`]
6991 * [`UdpSocket::ttl`]
6992 * [`UdpSocket::set_only_v6`]
6993 * [`UdpSocket::only_v6`]
6994 * [`UdpSocket::join_multicast_v4`]
6995 * [`UdpSocket::join_multicast_v6`]
6996 * [`UdpSocket::leave_multicast_v4`]
6997 * [`UdpSocket::leave_multicast_v6`]
6998 * [`UdpSocket::take_error`]
6999 * [`UdpSocket::connect`]
7000 * [`UdpSocket::send`]
7001 * [`UdpSocket::recv`]
7002 * [`UdpSocket::set_nonblocking`]
7007 * [`std::sync::Once` is poisoned if its initialization function
7009 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7010 * [Most types implement `fmt::Debug`][1.9db].
7011 * [The default buffer size used by `BufReader` and `BufWriter` was
7012 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7013 used by other languages.
7014 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7015 `Duration` additionally implements `*=` and `/=`][1.9ta].
7016 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7017 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7018 * [`Chain` implements `BufRead`][1.9ch].
7019 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7024 * [Cargo can now run concurrently][1.9cc].
7025 * [Top-level overrides allow specific revisions of crates to be
7026 overridden through the entire crate graph][1.9ct]. This is intended
7027 to make upgrades easier for large projects, by allowing crates to be
7028 forked temporarily until they've been upgraded and republished.
7029 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7030 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7031 on the commandline][1.9cf]. `rustc` arguments can also be specified
7032 in the `build.rustflags` configuration key.
7037 * [The time complexity of comparing variables for equivalence during type
7038 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7039 to major compilation time improvement in some scenarios.
7040 * [`ToString` is specialized for `str`, giving it the same performance
7041 as `to_owned`][1.9ts].
7042 * [Spawning processes with `Command::output` no longer creates extra
7044 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7045 for C-like enums][1.9cl].
7050 * [Passing the `--quiet` flag to a test runner will produce
7051 much-abbreviated output][1.9q].
7052 * The Rust Project now publishes std binaries for the
7053 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7054 `i586-pc-windows-msvc` targets.
7059 * [`std::sync::Once` is poisoned if its initialization function
7061 * [It is illegal to define methods with the same name in overlapping
7062 inherent `impl` blocks][1.9sn].
7063 * [`fn` item types are zero sized, and each `fn` names a unique
7064 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7065 `transmute` on a `fn` type will generate a warning for a few cycles,
7066 then will be converted to an error.
7067 * [Improvements to const evaluation may trigger new errors when integer
7068 literals are out of range][1.9ce].
7071 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7072 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7073 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7074 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7075 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7076 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7077 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7078 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7079 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7080 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7081 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7082 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7083 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7084 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7085 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7086 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7087 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7088 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7089 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7090 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7091 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7092 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7093 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7094 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7095 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7096 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7097 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7098 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7099 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7100 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7101 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7102 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7103 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7104 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7105 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7106 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7107 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7108 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7109 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7110 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7111 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7112 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7113 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7114 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7115 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7116 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7117 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7118 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7119 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7120 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7121 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7122 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7123 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7124 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7125 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7126 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7127 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7128 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7129 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7130 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7131 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7132 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7133 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7134 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7135 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7136 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7137 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7138 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7139 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7140 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7141 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7142 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7143 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7144 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7145 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7146 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7147 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7148 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7149 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7150 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7151 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7152 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7153 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7154 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7155 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7156 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7157 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7158 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7159 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7160 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7161 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7162 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7163 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7164 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7165 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7166 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7167 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7168 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7169 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7170 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7171 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7172 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7173 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7174 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7175 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7176 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7177 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7178 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7179 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7180 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7183 Version 1.8.0 (2016-04-14)
7184 ==========================
7189 * Rust supports overloading of compound assignment statements like
7190 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7191 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7192 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7194 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7195 addition to the non-braced form, `struct Foo;`. [RFC 218].
7201 * [`str::encode_utf16`] (renamed from `utf16_units`)
7202 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7205 * [`ptr::drop_in_place`]
7207 * [`time::SystemTime`]
7209 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7210 * [`Instant::elapsed`]
7211 * [`SystemTime::now`]
7212 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7213 * [`SystemTime::elapsed`]
7214 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7215 * [`SystemTimeError`]
7216 * [`SystemTimeError::duration`]
7217 * Various impls for `SystemTimeError`
7219 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7220 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7221 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7222 * [The `write!` and `writeln!` macros correctly emit errors if any of
7223 their arguments can't be formatted][1.8w].
7224 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7225 * [The Unix-specific `raw` modules, which contain a number of
7226 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7227 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7228 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7229 across platforms was making it difficult to implement `std`
7230 correctly. Those that need these definitions should use the `libc`
7232 * The Unix-specific `MetadataExt` traits, including
7233 `os::unix::fs::MetadataExt`, which expose values such as inode
7234 numbers [no longer return platform-specific types][1.8r], but
7235 instead return widened integers. [RFC 1415].
7236 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7237 * [Atomic loads and stores are not volatile][1.8a].
7238 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7243 * [Inlining hash functions lead to a 3% compile-time improvement in
7244 some workloads][1.8h].
7245 * When using jemalloc, its symbols are [unprefixed so that it
7246 overrides the libc malloc implementation][1.8h]. This means that for
7247 rustc, LLVM is now using jemalloc, which results in a 6%
7248 compile-time improvement on a specific workload.
7249 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7254 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7255 i686-pc-windows-msvc is now considered a tier-1 platform.
7256 * [The `--print targets` flag prints a list of supported targets][1.8t].
7257 * [The `--print cfg` flag prints the `cfg`s defined for the current
7259 * [`rustc` can be built with an new Cargo-based build system, written
7260 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7261 build system. To enable it configure with `configure --rustbuild`.
7262 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7263 variants while also indicating the total number of missing variants
7264 if more than 3][1.8m].
7265 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7266 * The Rust Project now publishes binary releases of the standard
7267 library for a number of tier-2 targets:
7268 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7269 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7270 `x86_64-rumprun-netbsd`. These can be installed with
7271 tools such as [multirust][1.8mr].
7276 * [`cargo init` creates a new Cargo project in the current
7277 directory][1.8ci]. It is otherwise like `cargo new`.
7278 * [Cargo has configuration keys for `-v` and
7279 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7280 `[term]` section of `.cargo/config`.
7281 * [Configuration keys that evaluate to strings or integers can be set
7282 via environment variables][1.8ce]. For example the `build.jobs` key
7283 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7284 precedence over config files.
7285 * [Target-specific dependencies support Rust `cfg` syntax for
7286 describing targets][1.8cfg] so that dependencies for multiple
7287 targets can be specified together. [RFC 1361].
7288 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7289 `RUSTDOC` take precedence over the `build.target-dir`,
7290 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7291 * [The child process tree is killed on Windows when Cargo is
7293 * [The `build.target` configuration value sets the target platform,
7294 like `--target`][1.8ct].
7299 * [Unstable compiler flags have been further restricted][1.8u]. Since
7300 1.0 `-Z` flags have been considered unstable, and other flags that
7301 were considered unstable additionally required passing `-Z
7302 unstable-options` to access. Unlike unstable language and library
7303 features though, these options have been accessible on the stable
7304 release channel. Going forward, *new unstable flags will not be
7305 available on the stable release channel*, and old unstable flags
7306 will warn about their usage. In the future, all unstable flags will
7307 be unavailable on the stable release channel.
7308 * [It is no longer possible to `match` on empty enum variants using
7309 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7310 * The Unix-specific `MetadataExt` traits, including
7311 `os::unix::fs::MetadataExt`, which expose values such as inode
7312 numbers [no longer return platform-specific types][1.8r], but
7313 instead return widened integers. [RFC 1415].
7314 * [Modules sourced from the filesystem cannot appear within arbitrary
7315 blocks, but only within other modules][1.8mf].
7316 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7317 * On Unix, [stack overflow triggers a runtime abort instead of a
7319 * [`Command::spawn` and its equivalents return an error if any of
7320 its command-line arguments contain interior `NUL`s][1.8n].
7321 * [Tuple and unit enum variants from other crates are in the type
7323 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7324 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7325 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7326 instead of `foo.lib`.
7329 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7330 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7331 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7332 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7333 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7334 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7335 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7336 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7337 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7338 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7339 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7340 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7341 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7342 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7343 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7344 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7345 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7346 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7347 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7348 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7349 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7350 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7351 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7352 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7353 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7354 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7355 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7356 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7357 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7358 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7359 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7360 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7361 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7362 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7363 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7364 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7365 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7366 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7367 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7368 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7369 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7370 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7371 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7372 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7373 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7374 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7375 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7376 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7377 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7378 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7379 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7380 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7381 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7382 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7383 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7384 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7385 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7386 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7387 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7388 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7391 Version 1.7.0 (2016-03-03)
7392 ==========================
7399 * [`Path::strip_prefix`] (renamed from relative_from)
7400 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7402 * [`Ipv4Addr::is_loopback`]
7403 * [`Ipv4Addr::is_private`]
7404 * [`Ipv4Addr::is_link_local`]
7405 * [`Ipv4Addr::is_multicast`]
7406 * [`Ipv4Addr::is_broadcast`]
7407 * [`Ipv4Addr::is_documentation`]
7409 * [`Ipv6Addr::is_unspecified`]
7410 * [`Ipv6Addr::is_loopback`]
7411 * [`Ipv6Addr::is_multicast`]
7414 * [`Vec::as_mut_slice`]
7416 * [`String::as_str`]
7417 * [`String::as_mut_str`]
7419 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7421 * `<[T]>::`[`sort_by_key`]
7422 * checked, saturated, and overflowing operations
7423 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7424 * [`i32::saturating_mul`]
7425 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7426 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7427 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7428 * [`u32::saturating_mul`]
7429 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7430 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7431 * and checked, saturated, and overflowing operations for other primitive types
7433 * [`ffi::IntoStringError`]
7434 * [`CString::into_string`]
7435 * [`CString::into_bytes`]
7436 * [`CString::into_bytes_with_nul`]
7437 * `From<CString> for Vec<u8>`
7439 * [`IntoStringError::into_cstring`]
7440 * [`IntoStringError::utf8_error`]
7441 * `Error for IntoStringError`
7443 * [`std::hash::BuildHasher`]
7444 * [`BuildHasher::Hasher`]
7445 * [`BuildHasher::build_hasher`]
7446 * [`std::hash::BuildHasherDefault`]
7447 * [`HashMap::with_hasher`]
7448 * [`HashMap::with_capacity_and_hasher`]
7449 * [`HashSet::with_hasher`]
7450 * [`HashSet::with_capacity_and_hasher`]
7451 * [`std::collections::hash_map::RandomState`]
7452 * [`RandomState::new`]
7453 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7454 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7455 from bytes is faster.
7456 * [The performance of `LineWriter` (and thus `io::stdout`) was
7457 improved by using `memchr` to search for newlines][1.7m].
7458 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7459 `f64` variants were stabilized previously.
7460 * [`BTreeMap` was rewritten to use less memory and improve the performance
7461 of insertion and iteration, the latter by as much as 5x][1.7bm].
7462 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7463 covariant over their contained type][1.7bt].
7464 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7465 over their contained type][1.7ll].
7466 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7468 * [`Any` is implemented for unsized types][1.7a].
7469 * [`Hash` is implemented for `Duration`][1.7h].
7474 * [When running tests with `--test`, rustdoc will pass `--cfg`
7475 arguments to the compiler][1.7dt].
7476 * [The compiler is built with RPATH information by default][1.7rpa].
7477 This means that it will be possible to run `rustc` when installed in
7478 unusual configurations without configuring the dynamic linker search
7480 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7481 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7482 over `LD_LIBRARY_PATH`.
7487 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7488 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7489 * [The `rerun-if-changed` build script directive no longer causes the
7490 build script to incorrectly run twice in certain scenarios][1.7rr].
7495 * Soundness fixes to the interactions between associated types and
7496 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7497 code that violates the new rules. This is a significant change that
7498 is known to break existing code, so it has emitted warnings for the
7499 new error cases since 1.4 to give crate authors time to adapt. The
7500 details of what is changing are subtle; read the RFC for more.
7501 * [Several bugs in the compiler's visibility calculations were
7502 fixed][1.7v]. Since this was found to break significant amounts of
7503 code, the new errors will be emitted as warnings for several release
7504 cycles, under the `private_in_public` lint.
7505 * Defaulted type parameters were accidentally accepted in positions
7506 that were not intended. In this release, [defaulted type parameters
7507 appearing outside of type definitions will generate a
7508 warning][1.7d], which will become an error in future releases.
7509 * [Parsing "." as a float results in an error instead of 0][1.7p].
7510 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7511 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7513 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7514 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7515 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7516 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7517 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7518 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7519 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7520 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7521 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7522 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7523 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7524 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7525 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7526 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7527 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7528 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7529 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7530 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7531 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7532 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7533 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7534 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7535 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7536 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7537 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7538 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7539 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7540 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7541 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7542 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7543 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7544 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7545 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7546 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7547 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7548 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7549 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7550 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7551 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7552 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7553 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7554 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7555 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7556 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7557 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7558 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7559 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7560 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7561 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7562 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7563 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7564 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7565 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7566 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7567 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7568 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7569 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7570 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7571 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7572 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7573 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7574 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7575 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7576 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7577 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7578 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7579 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7580 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7581 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7582 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7583 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7584 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7585 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7586 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7587 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7588 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7589 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7590 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7591 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7594 Version 1.6.0 (2016-01-21)
7595 ==========================
7600 * The `#![no_std]` attribute causes a crate to not be linked to the
7601 standard library, but only the [core library][1.6co], as described
7602 in [RFC 1184]. The core library defines common types and traits but
7603 has no platform dependencies whatsoever, and is the basis for Rust
7604 software in environments that cannot support a full port of the
7605 standard library, such as operating systems. Most of the core
7606 library is now stable.
7612 [`Read::read_exact`],
7613 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7614 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7615 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7616 [`os::unix::fs::DirBuilderExt`],
7617 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7618 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7619 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7620 [`collections::hash_map::Drain`],
7621 [`collections::hash_map::HashMap::drain`],
7622 [`collections::hash_set::Drain`],
7623 [`collections::hash_set::HashSet::drain`],
7624 [`collections::binary_heap::Drain`],
7625 [`collections::binary_heap::BinaryHeap::drain`],
7626 [`Vec::extend_from_slice`] (renamed from `push_all`),
7627 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7628 [`RwLock::into_inner`],
7629 [`Iterator::min_by_key`] (renamed from `min_by`),
7630 [`Iterator::max_by_key`] (renamed from `max_by`).
7631 * The [core library][1.6co] is stable, as are most of its APIs.
7632 * [The `assert_eq!` macro supports arguments that don't implement
7633 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7635 * Several timer functions that take duration in milliseconds [are
7636 deprecated in favor of those that take `Duration`][1.6ms]. These
7637 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7638 `thread::park_timeout_ms`.
7639 * The algorithm by which `Vec` reserves additional elements was
7640 [tweaked to not allocate excessive space][1.6a] while still growing
7642 * `From` conversions are [implemented from integers to floats][1.6f]
7643 in cases where the conversion is lossless. Thus they are not
7644 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7645 or `f64`. They are also not implemented for `isize` and `usize`
7646 because the implementations would be platform-specific. `From` is
7647 also implemented from `f32` to `f64`.
7648 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7649 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7650 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7651 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7653 * Sorting slices that are already sorted [is 50% faster in some
7659 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7660 * Cargo build scripts can specify their dependencies by emitting the
7661 [`rerun-if-changed`][1.6rr] key.
7662 * crates.io will reject publication of crates with dependencies that
7663 have a wildcard version constraint. Crates with wildcard
7664 dependencies were seen to cause a variety of problems, as described
7665 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7667 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7668 release folder. A variety of artifacts that Cargo failed to clean
7669 are now correctly deleted.
7674 * The `unreachable_code` lint [warns when a function call's argument
7676 * The parser indicates [failures that may be caused by
7677 confusingly-similar Unicode characters][1.6uc]
7678 * Certain macro errors [are reported at definition time][1.6m], not
7684 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7685 environment variable when locating crates. This was a pre-cargo
7686 feature for integrating with the package manager that was
7687 accidentally never removed.
7688 * [A number of bugs were fixed in the privacy checker][1.6p] that
7689 could cause previously-accepted code to break.
7690 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7691 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7692 struct pattern syntax (`Foo(..)`) can no longer be used to match
7693 unit structs. This is a warning now, but will become an error in
7694 future releases. Patterns that share the same name as a const are
7696 * A bug was fixed that causes [rustc not to apply default type
7697 parameters][1.6xc] when resolving certain method implementations of
7698 traits defined in other crates.
7700 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7701 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7702 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7703 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7704 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7705 [1.6co]: http://doc.rust-lang.org/core/index.html
7706 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7707 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7708 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7709 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7710 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7711 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7712 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7713 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7714 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7715 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7716 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7717 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7718 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7719 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7720 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7721 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7722 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7723 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7724 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7725 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7726 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7727 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7728 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7729 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7730 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7731 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7732 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7733 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7734 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7735 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7736 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7737 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7738 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7739 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7740 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7741 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7742 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7743 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7744 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7745 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7746 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7749 Version 1.5.0 (2015-12-10)
7750 ==========================
7752 * ~700 changes, numerous bugfixes
7758 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7759 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7760 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7761 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7762 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7763 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7764 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7765 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7766 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7767 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7768 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7769 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7770 [`Path::read_link`], [`Path::symlink_metadata`],
7771 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7772 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7773 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7774 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7775 [`slice::split_first_mut`], [`slice::split_first`],
7776 [`slice::split_last_mut`], [`slice::split_last`],
7777 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7778 [`str::MatchIndices`], [`str::RMatchIndices`],
7779 [`str::match_indices`], [`str::rmatch_indices`],
7780 [`str::slice_mut_unchecked`], [`string::ParseError`].
7781 * Rust applications hosted on crates.io can be installed locally to
7782 `~/.cargo/bin` with the [`cargo install`] command. Among other
7783 things this makes it easier to augment Cargo with new subcommands:
7784 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7785 invoked as `cargo foo`.
7786 * Crates with wildcard (`*`) dependencies will [emit warnings when
7787 published][1.5w]. In 1.6 it will no longer be possible to publish
7788 crates with wildcard dependencies.
7793 * The rules determining when a particular lifetime must outlive
7794 a particular value (known as '[dropck]') have been [modified
7795 to not rely on parametricity][1.5p].
7796 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7797 and `Arc`][1.5a]. Because these smart pointer types implement
7798 `Deref`, this causes breakage in cases where the interior type
7799 contains methods of the same name.
7800 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7801 that they could drop their content. Soundness fix.
7802 * All method invocations are [properly checked][1.5wf1] for
7803 [well-formedness][1.5wf2]. Soundness fix.
7804 * Traits whose supertraits contain `Self` are [not object
7805 safe][1.5o]. Soundness fix.
7806 * Target specifications support a [`no_default_libraries`][1.5nd]
7807 setting that controls whether `-nodefaultlibs` is passed to the
7808 linker, and in turn the `is_like_windows` setting no longer affects
7809 the `-nodefaultlibs` flag.
7810 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7811 * The `#[inline]` and `#[repr]` attributes [can only appear
7812 in valid locations][1.5at].
7813 * Native libraries linked from the local crate are [passed to
7814 the linker before native libraries from upstream crates][1.5nl].
7815 * Two rarely-used attributes, `#[no_debug]` and
7816 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7817 * Negation of unsigned integers, which has been a warning for
7818 several releases, [is now behind a feature gate and will
7819 generate errors][1.5nu].
7820 * The parser accidentally accepted visibility modifiers on
7821 enum variants, a bug [which has been fixed][1.5ev].
7822 * [A bug was fixed that allowed `use` statements to import unstable
7828 * When evaluating expressions at compile-time that are not
7829 compile-time constants (const-evaluating expressions in non-const
7830 contexts), incorrect code such as overlong bitshifts and arithmetic
7831 overflow will [generate a warning instead of an error][1.5ce],
7832 delaying the error until runtime. This will allow the
7833 const-evaluator to be expanded in the future backwards-compatibly.
7834 * The `improper_ctypes` lint [no longer warns about using `isize` and
7835 `usize` in FFI][1.5ict].
7840 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7842 * `Default` is [implemented for mutable slices][1.5d].
7843 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7844 * There are now `From` conversions [between floating point
7845 types][1.5f] where the conversions are lossless.
7846 * There are now `From` conversions [between integer types][1.5i] where
7847 the conversions are lossless.
7848 * [`fs::Metadata` implements `Clone`][1.5fs].
7849 * The `parse` method [accepts a leading "+" when parsing
7851 * [`AsMut` is implemented for `Vec`][1.5am].
7852 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7853 been optimized][1.5cf] and no longer rely on the default impl.
7854 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7855 `unsafe extern "C"` function types now [implement `Clone`,
7856 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7857 `fmt::Debug` for up to 12 arguments][1.5fp].
7858 * [Dropping `Vec`s is much faster in unoptimized builds when the
7859 element types don't implement `Drop`][1.5dv].
7860 * A bug that caused in incorrect behavior when [combining `VecDeque`
7861 with zero-sized types][1.5vdz] was resolved.
7862 * [`PartialOrd` for slices is faster][1.5po].
7867 * [Crate metadata size was reduced by 20%][1.5md].
7868 * [Improvements to code generation reduced the size of libcore by 3.3
7869 MB and rustc's memory usage by 18MB][1.5m].
7870 * [Improvements to deref translation increased performance in
7871 unoptimized builds][1.5dr].
7872 * Various errors in trait resolution [are deduplicated to only be
7873 reported once][1.5te].
7874 * Rust has preliminary [support for rumprun kernels][1.5rr].
7875 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7877 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7878 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7879 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7880 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7881 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7882 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7883 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7884 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7885 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7886 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7887 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7888 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7889 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7890 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7891 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7892 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7893 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7894 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7895 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7896 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7897 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7898 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7899 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7900 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7901 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7902 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7903 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7904 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7905 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7906 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7907 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7908 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7909 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7910 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7911 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7912 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7913 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7914 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7915 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7916 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7917 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7918 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7919 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7920 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7921 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7922 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7923 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7924 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7925 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7926 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7927 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7928 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7929 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7930 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7931 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7932 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7933 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7934 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7935 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7936 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7937 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7938 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7939 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7940 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7941 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7942 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7943 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7944 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7945 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7946 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7947 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7948 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7949 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7950 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7951 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7952 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7953 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7954 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7955 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7956 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7957 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7958 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7959 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7960 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7961 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7962 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7963 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7964 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7965 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7967 Version 1.4.0 (2015-10-29)
7968 ==========================
7970 * ~1200 changes, numerous bugfixes
7975 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7976 GNU) are now supported and recommended for use.
7981 * [Several changes have been made to fix type soundness and improve
7982 the behavior of associated types][sound]. See [RFC 1214]. Although
7983 we have mostly introduced these changes as warnings this release, to
7984 become errors next release, there are still some scenarios that will
7985 see immediate breakage.
7986 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7987 line breaks in addition to `\n`][crlf].
7988 * [Loans of `'static` lifetime extend to the end of a function][stat].
7989 * [`str::parse` no longer introduces avoidable rounding error when
7990 parsing floating point numbers. Together with earlier changes to
7991 float formatting/output, "round trips" like f.to_string().parse()
7992 now preserve the value of f exactly. Additionally, leading plus
7993 signs are now accepted][fp3].
7999 * `use` statements that import multiple items [can now rename
8000 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8001 * [Binops work correctly on fat pointers][binfat].
8002 * `pub extern crate`, which does not behave as expected, [issues a
8003 warning][pec] until a better solution is found.
8008 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8009 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8010 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8011 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8012 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8013 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8014 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8015 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8016 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8017 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8018 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8019 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8020 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8021 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8022 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8023 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8024 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8025 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8027 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8028 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8029 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8030 `f64::from_str_radix`.
8031 * [Reverse-searching strings is faster with the 'two-way'
8033 * [`std::io::copy` allows `?Sized` arguments][cc].
8034 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8035 [override `count`, `nth` and `last` with an O(1)
8036 implementation][it].
8037 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8038 * [`IntoRawFd` has been added to the Unix-specific prelude,
8039 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8041 * [`Extend<String>` and `FromIterator<String` are both implemented for
8043 * [`IntoIterator` is implemented for references to `Option` and
8045 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8046 Copy`][ext] as part of [RFC 839]. This will cause type inference
8047 breakage in rare situations.
8048 * [`BinaryHeap` implements `Debug`][bh2].
8049 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8051 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8052 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8053 * [String comparison is faster][faststr].
8054 * `&mut T` where `T: std::fmt::Write` [also implements
8055 `std::fmt::Write`][mutw].
8056 * [A stable regression in `VecDeque::push_back` and other
8057 capacity-altering methods that caused panics for zero-sized types
8059 * [Function pointers implement traits for up to 12 parameters][fp2].
8064 * The compiler [no longer uses the 'morestack' feature to prevent
8065 stack overflow][mm]. Instead it uses guard pages and stack
8066 probes (though stack probes are not yet implemented on any platform
8068 * [The compiler matches traits faster when projections are involved][p].
8069 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8071 * [Cargo now displays useful information about what its doing during
8072 `cargo update`][cu].
8074 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8075 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8076 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8077 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8078 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8079 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8080 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8081 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8082 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8083 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8084 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8085 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8086 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8087 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8088 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8089 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8090 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8091 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8092 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8093 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8094 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8095 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8096 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8097 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8098 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8099 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8100 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8101 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8102 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8103 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8104 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8105 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8106 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8107 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8108 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8109 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8110 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8111 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8112 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8113 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8114 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8115 [bh2]: https://github.com/rust-lang/rust/pull/28156
8116 [binfat]: https://github.com/rust-lang/rust/pull/28270
8117 [bm]: https://github.com/rust-lang/rust/pull/28197
8118 [cc]: https://github.com/rust-lang/rust/pull/27531
8119 [crlf]: https://github.com/rust-lang/rust/pull/28034
8120 [cu]: https://github.com/rust-lang/cargo/pull/1931
8121 [d]: https://github.com/rust-lang/rust/pull/27825
8122 [dep]: https://github.com/rust-lang/rust/pull/28339
8123 [es]: https://github.com/rust-lang/rust/pull/27956
8124 [ext]: https://github.com/rust-lang/rust/pull/28094
8125 [faststr]: https://github.com/rust-lang/rust/pull/28338
8126 [ffi]: https://github.com/rust-lang/rust/pull/28779
8127 [fp]: https://github.com/rust-lang/rust/pull/28268
8128 [fp2]: https://github.com/rust-lang/rust/pull/28560
8129 [fp3]: https://github.com/rust-lang/rust/pull/27307
8130 [i]: https://github.com/rust-lang/rust/pull/27451
8131 [into2]: https://github.com/rust-lang/rust/pull/28039
8132 [it]: https://github.com/rust-lang/rust/pull/27652
8133 [mm]: https://github.com/rust-lang/rust/pull/27338
8134 [mutw]: https://github.com/rust-lang/rust/pull/28368
8135 [sound]: https://github.com/rust-lang/rust/pull/27641
8136 [p]: https://github.com/rust-lang/rust/pull/27866
8137 [pec]: https://github.com/rust-lang/rust/pull/28486
8138 [pr]: https://github.com/rust-lang/rust/pull/27896
8139 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8140 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8141 [s]: https://github.com/rust-lang/rust/pull/27474
8142 [stab]: https://github.com/rust-lang/rust/pull/28339
8143 [stat]: https://github.com/rust-lang/rust/pull/28321
8144 [vd]: https://github.com/rust-lang/rust/pull/28494
8146 Version 1.3.0 (2015-09-17)
8147 ==============================
8149 * ~900 changes, numerous bugfixes
8154 * The [new object lifetime defaults][nold] have been [turned
8155 on][nold2] after a cycle of warnings about the change. Now types
8156 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8157 being interpreted as `&'a Box<Trait+'a>` to `&'a
8158 Box<Trait+'static>`.
8159 * [The Rustonomicon][nom] is a new book in the official documentation
8160 that dives into writing unsafe Rust.
8161 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8162 timekeeping is employed by other std APIs, as well as out-of-tree
8168 * The [new object lifetime defaults][nold] have been [turned
8169 on][nold2] after a cycle of warnings about the change.
8170 * There is a known [regression][lr] in how object lifetime elision is
8171 interpreted, the proper solution for which is undetermined.
8172 * The `#[prelude_import]` attribute, an internal implementation
8173 detail, was accidentally stabilized previously. [It has been put
8174 behind the `prelude_import` feature gate][pi]. This change is
8175 believed to break no existing code.
8176 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8177 [more sane for dynamically sized types][dst3]. Code that relied on
8178 the previous behavior is thought to be broken.
8179 * The `dropck` rules, which checks that destructors can't access
8180 destroyed values, [have been updated][dropck] to match the
8181 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8182 cause some previously-compiling code to no longer build.
8187 * The [new object lifetime defaults][nold] have been [turned
8188 on][nold2] after a cycle of warnings about the change.
8189 * Semicolons may [now follow types and paths in
8190 macros](https://github.com/rust-lang/rust/pull/27000).
8191 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8192 [more sane for dynamically sized types][dst3]. Code that relied on
8193 the previous behavior is not known to exist, and suspected to be
8195 * `'static` variables [may now be recursive][st].
8196 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8197 implementations correctly.
8198 * The `dropck` rules, which checks that destructors can't access
8199 destroyed values, [have been updated][dropck] to match the
8205 * The [`Duration`] API, [has been stabilized][ds], as well as the
8206 `std::time` module, which presently contains only `Duration`.
8207 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8208 * The owned C string, [`CString`], implements [`Borrow`] and the
8209 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8210 these allow C strings to be borrowed and cloned in generic code.
8211 * [`CStr`] implements [`Debug`].
8212 * [`AtomicPtr`] implements [`Debug`].
8213 * [`Error`] trait objects [can be downcast to their concrete types][e]
8214 in many common configurations, using the [`is`], [`downcast`],
8215 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8217 * Searching for substrings now [employs the two-way algorithm][search]
8218 instead of doing a naive search. This gives major speedups to a
8219 number of methods, including [`contains`][sc], [`find`][sf],
8220 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8221 [`ends_with`][sew] are also faster.
8222 * The performance of `PartialEq` for slices is [much faster][ps].
8223 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8224 is overridden and optimized by the implementations for scalars.
8225 * The [`Hasher`] trait now has a number of specialized `write_*`
8226 methods for primitive types, for efficiency.
8227 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8228 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8229 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8230 of [`std::error::Error::cause`][iec] also delegates to the inner
8232 * [`process::Child`][pc] gained the [`id`] method, which returns a
8233 `u32` representing the platform-specific process identifier.
8234 * The [`connect`] method on slices is deprecated, replaced by the new
8235 [`join`] method (note that both of these are on the *unstable*
8236 [`SliceConcatExt`] trait, but through the magic of the prelude are
8237 available to stable code anyway).
8238 * The [`Div`] operator is implemented for [`Wrapping`] types.
8239 * [`DerefMut` is implemented for `String`][dms].
8240 * Performance of SipHash (the default hasher for `HashMap`) is
8241 [better for long data][sh].
8242 * [`AtomicPtr`] implements [`Send`].
8243 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8244 are now [specialized to use uninitialized buffers for increased
8246 * Lifetime parameters of foreign functions [are now resolved
8252 * Rust can now, with some coercion, [produce programs that run on
8253 Windows XP][xp], though XP is not considered a supported platform.
8254 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8255 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8256 recommended for use in 1.3, though should be fully-functional
8257 in the [64-bit 1.4 beta][b14].
8258 * On Fedora-based systems installation will [properly configure the
8259 dynamic linker][fl].
8260 * The compiler gained many new extended error descriptions, which can
8261 be accessed with the `--explain` flag.
8262 * The `dropck` pass, which checks that destructors can't access
8263 destroyed values, [has been rewritten][dropck]. This fixes some
8264 soundness holes, and as such will cause some previously-compiling
8265 code to no longer build.
8266 * `rustc` now uses [LLVM to write archive files where possible][ar].
8267 Eventually this will eliminate the compiler's dependency on the ar
8269 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8270 supported FreeBSD on x86_64).
8271 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8272 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8274 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8275 will kill the process instead of leaking][nlp].
8277 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8278 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8279 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8280 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8281 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8282 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8283 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8284 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8285 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8286 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8287 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8288 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8289 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8290 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8291 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8292 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8293 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8294 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8295 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8296 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8297 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8298 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8299 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8300 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8301 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8302 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8303 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8304 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8305 [ar]: https://github.com/rust-lang/rust/pull/26926
8306 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8307 [dms]: https://github.com/rust-lang/rust/pull/26241
8308 [dropck]: https://github.com/rust-lang/rust/pull/27261
8309 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8310 [ds]: https://github.com/rust-lang/rust/pull/26818
8311 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8312 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8313 [dst3]: https://github.com/rust-lang/rust/pull/27351
8314 [e]: https://github.com/rust-lang/rust/pull/24793
8315 [f]: https://github.com/rust-lang/rust/pull/26588
8316 [fb]: https://github.com/rust-lang/rust/pull/26959
8317 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8318 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8319 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8320 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8321 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8322 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8323 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8324 [lic]: https://github.com/rust-lang/rust/pull/26583
8325 [lnu]: https://github.com/rust-lang/rust/pull/27026
8326 [lr]: https://github.com/rust-lang/rust/issues/27248
8327 [lum]: https://github.com/rust-lang/rust/pull/26378
8328 [lur]: https://github.com/rust-lang/rust/pull/26783
8329 [nlp]: https://github.com/rust-lang/rust/pull/27176
8330 [nold2]: https://github.com/rust-lang/rust/pull/27045
8331 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8332 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8333 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8334 [pi]: https://github.com/rust-lang/rust/pull/26699
8335 [ps]: https://github.com/rust-lang/rust/pull/26884
8336 [rte]: https://github.com/rust-lang/rust/pull/26950
8337 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8338 [search]: https://github.com/rust-lang/rust/pull/26327
8339 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8340 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8341 [sh]: https://github.com/rust-lang/rust/pull/27280
8342 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8343 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8344 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8345 [st]: https://github.com/rust-lang/rust/pull/26630
8346 [win1]: https://github.com/rust-lang/rust/pull/26569
8347 [win2]: https://github.com/rust-lang/rust/pull/26741
8348 [win3]: https://github.com/rust-lang/rust/pull/26741
8349 [win4]: https://github.com/rust-lang/rust/pull/27210
8350 [xp]: https://github.com/rust-lang/rust/pull/26569
8352 Version 1.2.0 (2015-08-07)
8353 ==========================
8355 * ~1200 changes, numerous bugfixes
8360 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8361 like `Rc` to contain types without a fixed size, arrays and trait
8362 objects, finally enabling use of `Rc<[T]>` and completing the
8363 implementation of DST.
8364 * [Parallel codegen][parcodegen] is now working again, which can
8365 substantially speed up large builds in debug mode; It also gets
8366 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8367 jobs). It's not enabled by default, but will be "in the near
8368 future". It can be activated with the `-C codegen-units=N` flag to
8370 * This is the first release with [experimental support for linking
8371 with the MSVC linker and lib C on Windows (instead of using the GNU
8372 variants via MinGW)][win]. It is yet recommended only for the most
8373 intrepid Rustaceans.
8374 * Benchmark compilations are showing a 30% improvement in
8375 bootstrapping over 1.1.
8380 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8381 unicode case mapping, which is a previously-planned change in
8382 behavior and considered a bugfix.
8383 * [`mem::align_of`] now specifies [the *minimum alignment* for
8384 T][align], which is usually the alignment programs are interested
8385 in, and the same value reported by clang's
8386 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8388 * [The `#[packed]` attribute is no longer silently accepted by the
8389 compiler][packed]. This attribute did nothing and code that
8390 mentioned it likely did not work as intended.
8391 * Associated type defaults are [now behind the
8392 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8393 defaults *did not work*, but could be mentioned syntactically. As
8394 such this breakage has minimal impact.
8399 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8400 matching against dereferenceable values.
8405 * The [`Extend`] trait, which grows a collection from an iterator, is
8406 implemented over iterators of references, for `String`, `Vec`,
8407 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8408 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8409 * The [`iter::once`] function returns an iterator that yields a single
8410 element, and [`iter::empty`] returns an iterator that yields no
8412 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8413 over substring matches.
8414 * [`Cell`] and [`RefCell`] both implement `Eq`.
8415 * A number of methods for wrapping arithmetic are added to the
8416 integral types, [`wrapping_div`], [`wrapping_rem`],
8417 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8418 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8419 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8420 type.. It is illegal for the default arithmetic operations in Rust
8421 to overflow; the desire to wrap must be explicit.
8422 * The `{:#?}` formatting specifier [displays the alternate,
8423 pretty-printed][debugfmt] form of the `Debug` formatter. This
8424 feature was actually introduced prior to 1.0 with little
8426 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8427 for writing data to formatted strings, similar to [`io::Write`].
8428 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8429 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8430 are used by code generators to emit implementations of [`Debug`].
8431 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8432 methods that convert case, following Unicode case mapping.
8433 * It is now easier to handle poisoned locks. The [`PoisonError`]
8434 type, returned by failing lock operations, exposes `into_inner`,
8435 `get_ref`, and `get_mut`, which all give access to the inner lock
8436 guard, and allow the poisoned lock to continue to operate. The
8437 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8438 poisoned lock without attempting to take the lock.
8439 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8440 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8441 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8442 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8444 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8450 * `rustc` employs smarter heuristics for guessing at [typos].
8451 * `rustc` emits more efficient code for [no-op conversions between
8452 unsafe pointers][nop].
8453 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8454 resulting in faster compile times and smaller code.
8456 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8457 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8458 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8459 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8460 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8461 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8462 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8463 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8464 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8465 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8466 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8467 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8468 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8469 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8470 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8471 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8472 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8473 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8474 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8475 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8476 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8477 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8478 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8479 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8480 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8481 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8482 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8483 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8484 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8485 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8486 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8487 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8488 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8489 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8490 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8491 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8492 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8493 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8494 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8495 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8496 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8497 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8498 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8499 [align]: https://github.com/rust-lang/rust/pull/25646
8500 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8501 [typos]: https://github.com/rust-lang/rust/pull/26087
8502 [nop]: https://github.com/rust-lang/rust/pull/26336
8503 [fat]: https://github.com/rust-lang/rust/pull/26411
8504 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8505 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8506 [packed]: https://github.com/rust-lang/rust/pull/25541
8507 [ad]: https://github.com/rust-lang/rust/pull/27382
8508 [win]: https://github.com/rust-lang/rust/pull/25350
8510 Version 1.1.0 (2015-06-25)
8511 =========================
8513 * ~850 changes, numerous bugfixes
8518 * The [`std::fs` module has been expanded][fs] to expand the set of
8519 functionality exposed:
8520 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8521 don't incur a syscall on some platforms.
8522 * A `symlink_metadata` function has been added.
8523 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8524 access to all underlying information.
8525 * The compiler now contains extended explanations of many errors. When an error
8526 with an explanation occurs the compiler suggests using the `--explain` flag
8527 to read the explanation. Error explanations are also [available online][err-index].
8528 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8529 well as other work, the time to bootstrap the compiler decreased by
8535 * The [`str::split_whitespace`] method splits a string on unicode
8536 whitespace boundaries.
8537 * On both Windows and Unix, new extension traits provide conversion of
8538 I/O types to and from the underlying system handles. On Unix, these
8539 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8540 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8541 `TcpListener`, and `UpdSocket`. Further implementations for
8542 `std::process` will be stabilized later.
8543 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8544 Windows, symlinks can be created with
8545 `std::os::windows::symlink_dir` and
8546 `std::os::windows::symlink_file`.
8547 * The `mpsc::Receiver` type can now be converted into an iterator with
8548 `into_iter` on the [`IntoIterator`] trait.
8549 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8550 implementation of the [`From`] trait.
8551 * The `Debug` implementation for `RangeFull` [creates output that is
8552 more consistent with other implementations][rf].
8553 * [`Debug` is implemented for `File`][file].
8554 * The `Default` implementation for `Arc` [no longer requires `Sync +
8556 * [The `Iterator` methods `count`, `nth`, and `last` have been
8557 overridden for slices to have O(1) performance instead of O(n)][si].
8558 * Incorrect handling of paths on Windows has been improved in both the
8559 compiler and the standard library.
8560 * [`AtomicPtr` gained a `Default` implementation][ap].
8561 * In accordance with Rust's policy on arithmetic overflow `abs` now
8562 [panics on overflow when debug assertions are enabled][abs].
8563 * The [`Cloned`] iterator, which was accidentally left unstable for
8564 1.0 [has been stabilized][c].
8565 * The [`Incoming`] iterator, which iterates over incoming TCP
8566 connections, and which was accidentally unnamable in 1.0, [is now
8567 properly exported][inc].
8568 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8569 `sift_up` or `sift_down` panic][bh].
8570 * The [`split_off`] method of `LinkedList` [no longer corrupts
8571 the list in certain scenarios][ll].
8576 * Type checking performance [has improved notably][sk] with
8577 [multiple improvements][pre].
8578 * The compiler [suggests code changes][ch] for more errors.
8579 * rustc and it's build system have experimental support for [building
8580 toolchains against MUSL][m] instead of glibc on Linux.
8581 * The compiler defines the `target_env` cfg value, which is used for
8582 distinguishing toolchains that are otherwise for the same
8583 platform. Presently this is set to `gnu` for common GNU Linux
8584 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8585 * The [`cargo rustc`][crc] command invokes a build with custom flags
8587 * [Android executables are always position independent][pie].
8588 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8591 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8592 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8593 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8594 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8595 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8596 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8597 [rf]: https://github.com/rust-lang/rust/pull/24491
8598 [err-index]: https://doc.rust-lang.org/error-index.html
8599 [sk]: https://github.com/rust-lang/rust/pull/24615
8600 [pre]: https://github.com/rust-lang/rust/pull/25323
8601 [file]: https://github.com/rust-lang/rust/pull/24598
8602 [ch]: https://github.com/rust-lang/rust/pull/24683
8603 [arc]: https://github.com/rust-lang/rust/pull/24695
8604 [si]: https://github.com/rust-lang/rust/pull/24701
8605 [ap]: https://github.com/rust-lang/rust/pull/24834
8606 [m]: https://github.com/rust-lang/rust/pull/24777
8607 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8608 [crc]: https://github.com/rust-lang/cargo/pull/1568
8609 [pie]: https://github.com/rust-lang/rust/pull/24953
8610 [abs]: https://github.com/rust-lang/rust/pull/25441
8611 [c]: https://github.com/rust-lang/rust/pull/25496
8612 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8613 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8614 [inc]: https://github.com/rust-lang/rust/pull/25522
8615 [bh]: https://github.com/rust-lang/rust/pull/25856
8616 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8617 [ll]: https://github.com/rust-lang/rust/pull/26022
8618 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8619 [drop]: https://github.com/rust-lang/rust/pull/24935
8621 Version 1.0.0 (2015-05-15)
8622 ========================
8624 * ~1500 changes, numerous bugfixes
8629 * The vast majority of the standard library is now `#[stable]`. It is
8630 no longer possible to use unstable features with a stable build of
8632 * Many popular crates on [crates.io] now work on the stable release
8634 * Arithmetic on basic integer types now [checks for overflow in debug
8640 * Several [restrictions have been added to trait coherence][coh] in
8641 order to make it easier for upstream authors to change traits
8642 without breaking downstream code.
8643 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8644 improve error messages and macro behavior. For example, `0b1234` is
8645 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8646 * Trait bounds [are always invariant][inv], eliminating the need for
8647 the `PhantomFn` and `MarkerTrait` lang items, which have been
8649 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8650 "foo" as bar` syntax has been replaced with `extern crate foo as
8651 bar`, and Cargo now automatically translates "-" in *package* names
8652 to underscore for the crate name.
8653 * [Lifetime shadowing is an error][lt].
8654 * [`Send` no longer implies `'static`][send-rfc].
8655 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8656 `MyType::default()`.
8657 * Primitive types [now have inherent methods][prim-inherent],
8658 obviating the need for extension traits like `SliceExt`.
8659 * Methods with `Self: Sized` in their `where` clause are [considered
8660 object-safe][self-sized], allowing many extension traits like
8661 `IteratorExt` to be merged into the traits they extended.
8662 * You can now [refer to associated types][assoc-where] whose
8663 corresponding trait bounds appear only in a `where` clause.
8664 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8665 like `Send` and `Sync` are now library-defined.
8666 * A [Reflect trait][reflect] was introduced, which means that
8667 downcasting via the `Any` trait is effectively limited to concrete
8668 types. This helps retain the potentially-important "parametricity"
8669 property: generic code cannot behave differently for different type
8670 arguments except in minor ways.
8671 * The `unsafe_destructor` feature is now deprecated in favor of the
8672 [new `dropck`][dropck]. This change is a major reduction in unsafe
8678 * The `thread_local` module [has been renamed to `std::thread`][th].
8679 * The methods of `IteratorExt` [have been moved to the `Iterator`
8681 * Several traits that implement Rust's conventions for type
8682 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8683 [centralized in the `std::convert` module][con].
8684 * The `FromError` trait [was removed in favor of `From`][fe].
8685 * The basic sleep function [has moved to
8686 `std::thread::sleep_ms`][slp].
8687 * The `splitn` function now takes an `n` parameter that represents the
8688 number of items yielded by the returned iterator [instead of the
8689 number of 'splits'][spl].
8690 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8691 * [Derived implementations of `PartialOrd` now order enums according
8692 to their explicitly-assigned discriminants][po].
8693 * [Methods for searching strings are generic over `Pattern`s][pat],
8694 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8696 * [In method resolution, object methods are resolved before inherent
8698 * [`String::from_str` has been deprecated in favor of the `From` impl,
8699 `String::from`][sf].
8700 * [`io::Error` implements `Sync`][ios].
8701 * [The `words` method on `&str` has been replaced with
8702 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8704 * The new path and IO modules are complete and `#[stable]`. This
8705 was the major library focus for this cycle.
8706 * The path API was [revised][path-normalize] to normalize `.`,
8707 adjusting the tradeoffs in favor of the most common usage.
8708 * A large number of remaining APIs in `std` were also stabilized
8709 during this cycle; about 75% of the non-deprecated API surface
8711 * The new [string pattern API][string-pattern] landed, which makes
8712 the string slice API much more internally consistent and flexible.
8713 * A new set of [generic conversion traits][conversion] replaced
8714 many existing ad hoc traits.
8715 * Generic numeric traits were [completely removed][num-traits]. This
8716 was made possible thanks to inherent methods for primitive types,
8717 and the removal gives maximal flexibility for designing a numeric
8718 hierarchy in the future.
8719 * The `Fn` traits are now related via [inheritance][fn-inherit]
8720 and provide ergonomic [blanket implementations][fn-blanket].
8721 * The `Index` and `IndexMut` traits were changed to
8722 [take the index by value][index-value], enabling code like
8723 `hash_map["string"]` to work.
8724 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8725 `Copy` data is known to be `Clone` as well.
8730 * Many errors now have extended explanations that can be accessed with
8731 the `--explain` flag to `rustc`.
8732 * Many new examples have been added to the standard library
8734 * rustdoc has received a number of improvements focused on completion
8736 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8737 * Much headway was made on ecosystem-wide CI, making it possible
8738 to [compare builds for breakage][ci-compare].
8741 [crates.io]: http://crates.io
8742 [clo]: https://github.com/rust-lang/rust/pull/24034
8743 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8744 [con]: https://github.com/rust-lang/rust/pull/23875
8745 [cr]: https://github.com/rust-lang/rust/pull/23419
8746 [fe]: https://github.com/rust-lang/rust/pull/23879
8747 [ie]: https://github.com/rust-lang/rust/pull/23300
8748 [inv]: https://github.com/rust-lang/rust/pull/23938
8749 [ios]: https://github.com/rust-lang/rust/pull/24133
8750 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8751 [lt]: https://github.com/rust-lang/rust/pull/24057
8752 [meth]: https://github.com/rust-lang/rust/pull/24056
8753 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8754 [po]: https://github.com/rust-lang/rust/pull/24270
8755 [sf]: https://github.com/rust-lang/rust/pull/24517
8756 [slp]: https://github.com/rust-lang/rust/pull/23949
8757 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8758 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8759 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8760 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8761 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8762 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8763 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8764 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8765 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8766 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8767 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8768 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8769 [reflect]: https://github.com/rust-lang/rust/pull/23712
8770 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8771 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8772 [index-value]: https://github.com/rust-lang/rust/pull/23601
8773 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8774 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8775 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8776 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8777 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8778 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8781 Version 1.0.0-alpha.2 (2015-02-20)
8782 =====================================
8784 * ~1300 changes, numerous bugfixes
8788 * The various I/O modules were [overhauled][io-rfc] to reduce
8789 unnecessary abstractions and provide better interoperation with
8790 the underlying platform. The old `io` module remains temporarily
8792 * The standard library now [participates in feature gating][feat],
8793 so use of unstable libraries now requires a `#![feature(...)]`
8794 attribute. The impact of this change is [described on the
8795 forum][feat-forum]. [RFC][feat-rfc].
8799 * `for` loops [now operate on the `IntoIterator` trait][into],
8800 which eliminates the need to call `.iter()`, etc. to iterate
8801 over collections. There are some new subtleties to remember
8802 though regarding what sort of iterators various types yield, in
8803 particular that `for foo in bar { }` yields values from a move
8804 iterator, destroying the original collection. [RFC][into-rfc].
8805 * Objects now have [default lifetime bounds][obj], so you don't
8806 have to write `Box<Trait+'static>` when you don't care about
8807 storing references. [RFC][obj-rfc].
8808 * In types that implement `Drop`, [lifetimes must outlive the
8809 value][drop]. This will soon make it possible to safely
8810 implement `Drop` for types where `#[unsafe_destructor]` is now
8811 required. Read the [gorgeous RFC][drop-rfc] for details.
8812 * The fully qualified <T as Trait>::X syntax lets you set the Self
8813 type for a trait method or associated type. [RFC][ufcs-rfc].
8814 * References to types that implement `Deref<U>` now [automatically
8815 coerce to references][deref] to the dereferenced type `U`,
8816 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8817 should eliminate many unsightly uses of `&*`, as when converting
8818 from references to vectors into references to
8819 slices. [RFC][deref-rfc].
8820 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8821 `|:|`) is obsolete and closure kind is inferred from context.
8822 * [`Self` is a keyword][Self].
8826 * The `Show` and `String` formatting traits [have been
8827 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8828 their related purposes. Automatically getting a string
8829 conversion to use with `format!("{:?}", something_to_debug)` is
8830 now written `#[derive(Debug)]`.
8831 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8832 OsStr}`, provide strings in platform-specific encodings for easier
8833 interop with system APIs. [RFC][osstr-rfc].
8834 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8835 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8836 creating raw pointers.
8840 * Certain long error messages of the form 'expected foo found bar'
8841 are now [split neatly across multiple
8842 lines][multiline]. Examples in the PR.
8843 * On Unix Rust can be [uninstalled][un] by running
8844 `/usr/local/lib/rustlib/uninstall.sh`.
8845 * The `#[rustc_on_unimplemented]` attribute, requiring the
8846 'on_unimplemented' feature, lets rustc [display custom error
8847 messages when a trait is expected to be implemented for a type
8852 * Rust is tested against a [LALR grammar][lalr], which parses
8853 almost all the Rust files that rustc does.
8855 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8856 [close]: https://github.com/rust-lang/rust/pull/21843
8857 [deref]: https://github.com/rust-lang/rust/pull/21351
8858 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8859 [drop]: https://github.com/rust-lang/rust/pull/21972
8860 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8861 [feat]: https://github.com/rust-lang/rust/pull/21248
8862 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8863 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8864 [fmt]: https://github.com/rust-lang/rust/pull/21457
8865 [into]: https://github.com/rust-lang/rust/pull/20790
8866 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8867 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8868 [lalr]: https://github.com/rust-lang/rust/pull/21452
8869 [multiline]: https://github.com/rust-lang/rust/pull/19870
8870 [obj]: https://github.com/rust-lang/rust/pull/22230
8871 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8872 [onun]: https://github.com/rust-lang/rust/pull/20889
8873 [osstr]: https://github.com/rust-lang/rust/pull/21488
8874 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8875 [Self]: https://github.com/rust-lang/rust/pull/22158
8876 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8877 [un]: https://github.com/rust-lang/rust/pull/22256
8880 Version 1.0.0-alpha (2015-01-09)
8881 ==================================
8883 * ~2400 changes, numerous bugfixes
8887 * The language itself is considered feature complete for 1.0,
8888 though there will be many usability improvements and bugfixes
8889 before the final release.
8890 * Nearly 50% of the public API surface of the standard library has
8891 been declared 'stable'. Those interfaces are unlikely to change
8893 * The long-running debate over integer types has been
8894 [settled][ints]: Rust will ship with types named `isize` and
8895 `usize`, rather than `int` and `uint`, for pointer-sized
8896 integers. Guidelines will be rolled out during the alpha cycle.
8897 * Most crates that are not `std` have been moved out of the Rust
8898 distribution into the Cargo ecosystem so they can evolve
8899 separately and don't need to be stabilized as quickly, including
8900 'time', 'getopts', 'num', 'regex', and 'term'.
8901 * Documentation continues to be expanded with more API coverage, more
8902 examples, and more in-depth explanations. The guides have been
8903 consolidated into [The Rust Programming Language][trpl].
8904 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8905 * All official Rust binary installers now come with [Cargo], the
8906 Rust package manager.
8910 * Closures have been [completely redesigned][unboxed] to be
8911 implemented in terms of traits, can now be used as generic type
8912 bounds and thus monomorphized and inlined, or via an opaque
8913 pointer (boxed) as in the old system. The new system is often
8914 referred to as 'unboxed' closures.
8915 * Traits now support [associated types][assoc], allowing families
8916 of related types to be defined together and used generically in
8918 * Enum variants are [namespaced by their type names][enum].
8919 * [`where` clauses][where] provide a more versatile and attractive
8920 syntax for specifying generic bounds, though the previous syntax
8922 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8924 * Rust [no longer has a runtime][rt] of any description, and only
8925 supports OS threads, not green threads.
8926 * At long last, Rust has been overhauled for 'dynamically-sized
8927 types' ([DST]), which integrates 'fat pointers' (object types,
8928 arrays, and `str`) more deeply into the type system, making it
8930 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8931 `..j` that produce range types and which, when combined with the
8932 `Index` operator and multidispatch, leads to a convenient slice
8934 * The new range syntax revealed an ambiguity in the fixed-length
8935 array syntax, so now fixed length arrays [are written `[T;
8937 * The `Copy` trait is no longer implemented automatically. Unsafe
8938 pointers no longer implement `Sync` and `Send` so types
8939 containing them don't automatically either. `Sync` and `Send`
8940 are now 'unsafe traits' so one can "forcibly" implement them via
8941 `unsafe impl` if a type confirms to the requirements for them
8942 even though the internals do not (e.g. structs containing unsafe
8943 pointers like `Arc`). These changes are intended to prevent some
8944 footguns and are collectively known as [opt-in built-in
8945 traits][oibit] (though `Sync` and `Send` will soon become pure
8946 library types unknown to the compiler).
8947 * Operator traits now take their operands [by value][ops], and
8948 comparison traits can use multidispatch to compare one type
8949 against multiple other types, allowing e.g. `String` to be
8950 compared with `&str`.
8951 * `if let` and `while let` are no longer feature-gated.
8952 * Rust has adopted a more [uniform syntax for escaping unicode
8953 characters][unicode].
8954 * `macro_rules!` [has been declared stable][mac]. Though it is a
8955 flawed system it is sufficiently popular that it must be usable
8956 for 1.0. Effort has gone into [future-proofing][mac-future] it
8957 in ways that will allow other macro systems to be developed in
8958 parallel, and won't otherwise impact the evolution of the
8960 * The prelude has been [pared back significantly][prelude] such
8961 that it is the minimum necessary to support the most pervasive
8962 code patterns, and through [generalized where clauses][where]
8963 many of the prelude extension traits have been consolidated.
8964 * Rust's rudimentary reflection [has been removed][refl], as it
8965 incurred too much code generation for little benefit.
8966 * [Struct variants][structvars] are no longer feature-gated.
8967 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8968 known as 'higher-ranked trait bounds', this crucially allows
8969 unboxed closures to work.
8970 * Macros invocations surrounded by parens or square brackets and
8971 not terminated by a semicolon are [parsed as
8972 expressions][macros], which makes expressions like `vec![1i32,
8973 2, 3].len()` work as expected.
8974 * Trait objects now implement their traits automatically, and
8975 traits that can be coerced to objects now must be [object
8977 * Automatically deriving traits is now done with `#[derive(...)]`
8978 not `#[deriving(...)]` for [consistency with other naming
8979 conventions][derive].
8980 * Importing the containing module or enum at the same time as
8981 items or variants they contain is [now done with `self` instead
8982 of `mod`][self], as in use `foo::{self, bar}`
8983 * Glob imports are no longer feature-gated.
8984 * The `box` operator and `box` patterns have been feature-gated
8985 pending a redesign. For now unique boxes should be allocated
8986 like other containers, with `Box::new`.
8990 * A [series][coll1] of [efforts][coll2] to establish
8991 [conventions][coll3] for collections types has resulted in API
8992 improvements throughout the standard library.
8993 * New [APIs for error handling][err] provide ergonomic interop
8994 between error types, and [new conventions][err-conv] describe
8995 more clearly the recommended error handling strategies in Rust.
8996 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8997 it is easier to discuss failure in the context of error handling
8998 without making clarifications as to whether you are referring to
8999 the 'fail' macro or failure more generally.
9000 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9001 syscall when available.
9002 * The 'serialize' crate has been renamed 'rustc-serialize' and
9003 moved out of the distribution to Cargo. Although it is widely
9004 used now, it is expected to be superseded in the near future.
9005 * The `Show` formatter, typically implemented with
9006 `#[derive(Show)]` is [now requested with the `{:?}`
9007 specifier][show] and is intended for use by all types, for uses
9008 such as `println!` debugging. The new `String` formatter must be
9009 implemented by hand, uses the `{}` specifier, and is intended
9010 for full-fidelity conversions of things that can logically be
9011 represented as strings.
9015 * [Flexible target specification][flex] allows rustc's code
9016 generation to be configured to support otherwise-unsupported
9018 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9019 respective debuggers with Rust-appropriate pretty-printing.
9020 * The Windows installation of Rust is distributed with the
9021 MinGW components currently required to link binaries on that
9026 * Nullable enum optimizations have been extended to more types so
9027 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9028 space than the inner types themselves.
9029 * Work has begun on supporting AArch64.
9031 [Cargo]: https://crates.io
9032 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9033 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9034 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9035 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9036 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9037 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9038 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9039 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9040 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9041 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9042 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9043 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9044 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9045 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9046 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9047 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9048 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9049 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9050 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9051 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9052 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9053 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9054 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9055 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9056 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9057 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9058 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9059 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9060 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9061 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9062 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9063 [trpl]: https://doc.rust-lang.org/book/index.html
9064 [rbe]: http://rustbyexample.com/
9067 Version 0.12.0 (2014-10-09)
9068 =============================
9070 * ~1900 changes, numerous bugfixes
9074 * The introductory documentation (now called The Rust Guide) has
9075 been completely rewritten, as have a number of supplementary
9077 * Rust's package manager, Cargo, continues to improve and is
9078 sometimes considered to be quite awesome.
9079 * Many API's in `std` have been reviewed and updated for
9080 consistency with the in-development Rust coding
9081 guidelines. The standard library documentation tracks
9082 stabilization progress.
9083 * Minor libraries have been moved out-of-tree to the rust-lang org
9084 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9085 be installed with Cargo.
9086 * Lifetime elision allows lifetime annotations to be left off of
9087 function declarations in many common scenarios.
9088 * Rust now works on 64-bit Windows.
9091 * Indexing can be overloaded with the `Index` and `IndexMut`
9093 * The `if let` construct takes a branch only if the `let` pattern
9094 matches, currently behind the 'if_let' feature gate.
9095 * 'where clauses', a more flexible syntax for specifying trait
9096 bounds that is more aesthetic, have been added for traits and
9097 free functions. Where clauses will in the future make it
9098 possible to constrain associated types, which would be
9099 impossible with the existing syntax.
9100 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9101 the 'slicing_syntax' feature gate, and can be overloaded with
9102 the `Slice` or `SliceMut` traits.
9103 * The syntax for matching of sub-slices has been changed to use a
9104 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9105 consistency with other uses of `..` and to future-proof
9106 potential additional uses of the syntax.
9107 * The syntax for matching inclusive ranges in patterns has changed
9108 from `0..3` to `0...4` to be consistent with the exclusive range
9110 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9111 c]`) has been put behind the 'advanced_slice_patterns' feature
9112 gate and may be removed in the future.
9113 * Components of tuples and tuple structs can be extracted using
9114 the `value.0` syntax, currently behind the `tuple_indexing`
9116 * The `#[crate_id]` attribute is no longer supported; versioning
9117 is handled by the package manager.
9118 * Renaming crate imports are now written `extern crate foo as bar`
9119 instead of `extern crate bar = foo`.
9120 * Renaming use statements are now written `use foo as bar` instead
9122 * `let` and `match` bindings and argument names in macros are now
9124 * The new, more efficient, closure types ('unboxed closures') have
9125 been added under a feature gate, 'unboxed_closures'. These will
9126 soon replace the existing closure types, once higher-ranked
9127 trait lifetimes are added to the language.
9128 * `move` has been added as a keyword, for indicating closures
9129 that capture by value.
9130 * Mutation and assignment is no longer allowed in pattern guards.
9131 * Generic structs and enums can now have trait bounds.
9132 * The `Share` trait is now called `Sync` to free up the term
9133 'shared' to refer to 'shared reference' (the default reference
9135 * Dynamically-sized types have been mostly implemented,
9136 unifying the behavior of fat-pointer types with the rest of the
9138 * As part of dynamically-sized types, the `Sized` trait has been
9139 introduced, which qualifying types implement by default, and
9140 which type parameters expect by default. To specify that a type
9141 parameter does not need to be sized, write `<Sized? T>`. Most
9142 types are `Sized`, notable exceptions being unsized arrays
9143 (`[T]`) and trait types.
9144 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9145 * Lifetime bounds can now be applied to type parameters and object
9147 * The old, reference counted GC type, `Gc<T>` which was once
9148 denoted by the `@` sigil, has finally been removed. GC will be
9149 revisited in the future.
9152 * Library documentation has been improved for a number of modules.
9153 * Bit-vectors, collections::bitv has been modernized.
9154 * The url crate is deprecated in favor of
9155 http://github.com/servo/rust-url, which can be installed with
9157 * Most I/O stream types can be cloned and subsequently closed from
9159 * A `std::time::Duration` type has been added for use in I/O
9160 methods that rely on timers, as well as in the 'time' crate's
9161 `Timespec` arithmetic.
9162 * The runtime I/O abstraction layer that enabled the green thread
9163 scheduler to do non-thread-blocking I/O has been removed, along
9164 with the libuv-based implementation employed by the green thread
9165 scheduler. This will greatly simplify the future I/O work.
9166 * `collections::btree` has been rewritten to have a more
9167 idiomatic and efficient design.
9170 * rustdoc output now indicates the stability levels of API's.
9171 * The `--crate-name` flag can specify the name of the crate
9172 being compiled, like `#[crate_name]`.
9173 * The `-C metadata` specifies additional metadata to hash into
9174 symbol names, and `-C extra-filename` specifies additional
9175 information to put into the output filename, for use by the
9176 package manager for versioning.
9177 * debug info generation has continued to improve and should be
9178 more reliable under both gdb and lldb.
9179 * rustc has experimental support for compiling in parallel
9180 using the `-C codegen-units` flag.
9181 * rustc no longer encodes rpath information into binaries by
9185 * Stack usage has been optimized with LLVM lifetime annotations.
9186 * Official Rust binaries on Linux are more compatible with older
9187 kernels and distributions, built on CentOS 5.10.
9190 Version 0.11.0 (2014-07-02)
9191 ==========================
9193 * ~1700 changes, numerous bugfixes
9196 * ~[T] has been removed from the language. This type is superseded by
9198 * ~str has been removed from the language. This type is superseded by
9200 * ~T has been removed from the language. This type is superseded by the
9202 * @T has been removed from the language. This type is superseded by the
9203 standard library's std::gc::Gc<T> type.
9204 * Struct fields are now all private by default.
9205 * Vector indices and shift amounts are both required to be a `uint`
9206 instead of any integral type.
9207 * Byte character, byte string, and raw byte string literals are now all
9208 supported by prefixing the normal literal with a `b`.
9209 * Multiple ABIs are no longer allowed in an ABI string
9210 * The syntax for lifetimes on closures/procedures has been tweaked
9211 slightly: `<'a>|A, B|: 'b + K -> T`
9212 * Floating point modulus has been removed from the language; however it
9213 is still provided by a library implementation.
9214 * Private enum variants are now disallowed.
9215 * The `priv` keyword has been removed from the language.
9216 * A closure can no longer be invoked through a &-pointer.
9217 * The `use foo, bar, baz;` syntax has been removed from the language.
9218 * The transmute intrinsic no longer works on type parameters.
9219 * Statics now allow blocks/items in their definition.
9220 * Trait bounds are separated from objects with + instead of : now.
9221 * Objects can no longer be read while they are mutably borrowed.
9222 * The address of a static is now marked as insignificant unless the
9223 #[inline(never)] attribute is placed it.
9224 * The #[unsafe_destructor] attribute is now behind a feature gate.
9225 * Struct literals are no longer allowed in ambiguous positions such as
9226 if, while, match, and for..in.
9227 * Declaration of lang items and intrinsics are now feature-gated by
9229 * Integral literals no longer default to `int`, and floating point
9230 literals no longer default to `f64`. Literals must be suffixed with an
9231 appropriate type if inference cannot determine the type of the
9233 * The Box<T> type is no longer implicitly borrowed to &mut T.
9234 * Procedures are now required to not capture borrowed references.
9237 * The standard library is now a "facade" over a number of underlying
9238 libraries. This means that development on the standard library should
9239 be speedier due to smaller crates, as well as a clearer line between
9241 * A new library, libcore, lives under the standard library's facade
9242 which is Rust's "0-assumption" library, suitable for embedded and
9243 kernel development for example.
9244 * A regex crate has been added to the standard distribution. This crate
9245 includes statically compiled regular expressions.
9246 * The unwrap/unwrap_err methods on Result require a Show bound for
9247 better error messages.
9248 * The return types of the std::comm primitives have been centralized
9249 around the Result type.
9250 * A number of I/O primitives have gained the ability to time out their
9252 * A number of I/O primitives have gained the ability to close their
9253 reading/writing halves to cancel pending operations.
9254 * Reverse iterator methods have been removed in favor of `rev()` on
9255 their forward-iteration counterparts.
9256 * A bitflags! macro has been added to enable easy interop with C and
9257 management of bit flags.
9258 * A debug_assert! macro is now provided which is disabled when
9259 `--cfg ndebug` is passed to the compiler.
9260 * A graphviz crate has been added for creating .dot files.
9261 * The std::cast module has been migrated into std::mem.
9262 * The std::local_data api has been migrated from freestanding functions
9263 to being based on methods.
9264 * The Pod trait has been renamed to Copy.
9265 * jemalloc has been added as the default allocator for types.
9266 * The API for allocating memory has been changed to use proper alignment
9267 and sized deallocation
9268 * Connecting a TcpStream or binding a TcpListener is now based on a
9269 string address and a u16 port. This allows connecting to a hostname as
9271 * The Reader trait now contains a core method, read_at_least(), which
9272 correctly handles many repeated 0-length reads.
9273 * The process-spawning API is now centered around a builder-style
9275 * The :? printing qualifier has been moved from the standard library to
9276 an external libdebug crate.
9277 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9278 have been renamed to Eq/Ord.
9279 * The select/plural methods have been removed from format!. The escapes
9280 for { and } have also changed from \{ and \} to {{ and }},
9282 * The TaskBuilder API has been re-worked to be a true builder, and
9283 extension traits for spawning native/green tasks have been added.
9286 * All breaking changes to the language or libraries now have their
9287 commit message annotated with `[breaking-change]` to allow for easy
9288 discovery of breaking changes.
9289 * The compiler will now try to suggest how to annotate lifetimes if a
9290 lifetime-related error occurs.
9291 * Debug info continues to be improved greatly with general bug fixes and
9292 better support for situations like link time optimization (LTO).
9293 * Usage of syntax extensions when cross-compiling has been fixed.
9294 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9295 -fdata-sections and --gc-sections has been enabled by default
9296 * The compiler is now stricter about where it will load module files
9297 from when a module is declared via `mod foo;`.
9298 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9299 Syntax extensions are now discovered via a "plugin registrar" type
9300 which will be extended in the future to other various plugins.
9301 * Lints have been restructured to allow for dynamically loadable lints.
9302 * A number of rustdoc improvements:
9303 * The HTML output has been visually redesigned.
9304 * Markdown is now powered by hoedown instead of sundown.
9305 * Searching heuristics have been greatly improved.
9306 * The search index has been reduced in size by a great amount.
9307 * Cross-crate documentation via `pub use` has been greatly improved.
9308 * Primitive types are now hyperlinked and documented.
9309 * Documentation has been moved from static.rust-lang.org/doc to
9311 * A new sandbox, play.rust-lang.org, is available for running and
9312 sharing rust code examples on-line.
9313 * Unused attributes are now more robustly warned about.
9314 * The dead_code lint now warns about unused struct fields.
9315 * Cross-compiling to iOS is now supported.
9316 * Cross-compiling to mipsel is now supported.
9317 * Stability attributes are now inherited by default and no longer apply
9318 to intra-crate usage, only inter-crate usage.
9319 * Error message related to non-exhaustive match expressions have been
9323 Version 0.10 (2014-04-03)
9324 =========================
9326 * ~1500 changes, numerous bugfixes
9329 * A new RFC process is now in place for modifying the language.
9330 * Patterns with `@`-pointers have been removed from the language.
9331 * Patterns with unique vectors (`~[T]`) have been removed from the
9333 * Patterns with unique strings (`~str`) have been removed from the
9335 * `@str` has been removed from the language.
9336 * `@[T]` has been removed from the language.
9337 * `@self` has been removed from the language.
9338 * `@Trait` has been removed from the language.
9339 * Headers on `~` allocations which contain `@` boxes inside the type for
9340 reference counting have been removed.
9341 * The semantics around the lifetimes of temporary expressions have changed,
9342 see #3511 and #11585 for more information.
9343 * Cross-crate syntax extensions are now possible, but feature gated. See
9344 #11151 for more information. This includes both `macro_rules!` macros as
9345 well as syntax extensions such as `format!`.
9346 * New lint modes have been added, and older ones have been turned on to be
9348 * Unnecessary parentheses
9351 * Uppercase variables
9352 * Publicly visible private types
9353 * `#[deriving]` with raw pointers
9354 * Unsafe functions can no longer be coerced to closures.
9355 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9356 * The `#[simd]` attribute is now behind a feature gate.
9357 * Visibility is no longer allowed on `extern crate` statements, and
9358 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9359 * Trailing commas are now allowed in argument lists and tuple patterns.
9360 * The `do` keyword has been removed, it is now a reserved keyword.
9361 * Default type parameters have been implemented, but are feature gated.
9362 * Borrowed variables through captures in closures are now considered soundly.
9363 * `extern mod` is now `extern crate`
9364 * The `Freeze` trait has been removed.
9365 * The `Share` trait has been added for types that can be shared among
9367 * Labels in macros are now hygienic.
9368 * Expression/statement macro invocations can be delimited with `{}` now.
9369 * Treatment of types allowed in `static mut` locations has been tweaked.
9370 * The `*` and `.` operators are now overloadable through the `Deref` and
9372 * `~Trait` and `proc` no longer have `Send` bounds by default.
9373 * Partial type hints are now supported with the `_` type marker.
9374 * An `Unsafe` type was introduced for interior mutability. It is now
9375 considered undefined to transmute from `&T` to `&mut T` without using the
9377 * The #[linkage] attribute was implemented for extern statics/functions.
9378 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9379 * `Pod` was renamed to `Copy`.
9382 * The `libextra` library has been removed. It has now been decomposed into
9383 component libraries with smaller and more focused nuggets of
9384 functionality. The full list of libraries can be found on the
9385 documentation index page.
9386 * std: `std::condition` has been removed. All I/O errors are now propagated
9387 through the `Result` type. In order to assist with error handling, a
9388 `try!` macro for unwrapping errors with an early return and a lint for
9389 unused results has been added. See #12039 for more information.
9390 * std: The `vec` module has been renamed to `slice`.
9391 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9392 This will become the only growable vector in the future.
9393 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9394 are now found at `std::io::BufferedReader` instead of
9395 `std::io::buffered::BufferedReader`.
9396 * std: `print` and `println` are no longer in the prelude, the `print!` and
9397 `println!` macros are intended to be used instead.
9398 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9399 attempts to statically prevent cycles.
9400 * std: The standard distribution is adopting the policy of pushing failure
9401 to the user rather than failing in libraries. Many functions (such as
9402 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9403 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9404 deriving mode: `#[deriving(Show)]`.
9405 * std: `ToStr` is now implemented for all types implementing `Show`.
9406 * std: The formatting trait methods now take `&self` instead of `&T`
9407 * std: The `invert()` method on iterators has been renamed to `rev()`
9408 * std: `std::num` has seen a reduction in the genericity of its traits,
9409 consolidating functionality into a few core traits.
9410 * std: Backtraces are now printed on task failure if the environment
9411 variable `RUST_BACKTRACE` is present.
9412 * std: Naming conventions for iterators have been standardized. More details
9413 can be found on the wiki's style guide.
9414 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9415 still implement the function.
9416 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9417 * std: `assert_approx_eq!` has been removed
9418 * std: The `e` and `E` formatting specifiers for floats have been added to
9419 print them in exponential notation.
9420 * std: The `Times` trait has been removed
9421 * std: Indications of variance and opting out of builtin bounds is done
9422 through marker types in `std::kinds::marker` now
9423 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9424 `#[deriving(Hash)]` is now possible.
9425 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9426 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9427 * std: `Chan::new` is now `channel()`.
9428 * std: A new synchronous channel type has been implemented.
9429 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9430 * std: `hashmap` and `trie` have been moved to `libcollections`
9431 * std: `run` has been rolled into `io::process`
9432 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9433 * std: The equality and comparison traits have seen some reorganization.
9434 * std: `rand` has moved to `librand`.
9435 * std: `to_{lower,upper}case` has been implemented for `char`.
9436 * std: Logging has been moved to `liblog`.
9437 * collections: `HashMap` has been rewritten for higher performance and less
9439 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9440 it can be booted manually. The runtime guide has more information and
9442 * native: All I/O functionality except signals has been implemented.
9443 * green: Task spawning with `libgreen` has been optimized with stack caching
9444 and various trimming of code.
9445 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9446 * sync: The `extra::sync` module has been updated to modern rust (and moved
9447 to the `sync` library), tweaking and improving various interfaces while
9448 dropping redundant functionality.
9449 * sync: A new `Barrier` type has been added to the `sync` library.
9450 * sync: An efficient mutex for native and green tasks has been implemented.
9451 * serialize: The `base64` module has seen some improvement. It treats
9452 newlines better, has non-string error values, and has seen general
9454 * fourcc: A `fourcc!` macro was introduced
9455 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9456 hexadecimal literal.
9459 * `rustpkg` has been deprecated and removed from the main repository. Its
9460 replacement, `cargo`, is under development.
9461 * Nightly builds of rust are now available
9462 * The memory usage of rustc has been improved many times throughout this
9464 * The build process supports disabling rpath support for the rustc binary
9466 * Code generation has improved in some cases, giving more information to the
9467 LLVM optimization passes to enable more extensive optimizations.
9468 * Debuginfo compatibility with lldb on OSX has been restored.
9469 * The master branch is now gated on an android bot, making building for
9470 android much more reliable.
9471 * Output flags have been centralized into one `--emit` flag.
9472 * Crate type flags have been centralized into one `--crate-type` flag.
9473 * Codegen flags have been consolidated behind a `-C` flag.
9474 * Linking against outdated crates now has improved error messages.
9475 * Error messages with lifetimes will often suggest how to annotate the
9476 function to fix the error.
9477 * Many more types are documented in the standard library, and new guides
9479 * Many `rustdoc` improvements:
9480 * code blocks are syntax highlighted.
9481 * render standalone markdown files.
9482 * the --test flag tests all code blocks by default.
9483 * exported macros are displayed.
9484 * re-exported types have their documentation inlined at the location of the
9486 * search works across crates that have been rendered to the same output
9490 Version 0.9 (2014-01-09)
9491 ==========================
9493 * ~1800 changes, numerous bugfixes
9496 * The `float` type has been removed. Use `f32` or `f64` instead.
9497 * A new facility for enabling experimental features (feature gating) has
9498 been added, using the crate-level `#[feature(foo)]` attribute.
9499 * Managed boxes (@) are now behind a feature gate
9500 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9501 standard library's `Gc` or `Rc` types instead.
9502 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9503 * Jumping back to the top of a loop is now done with `continue` instead of
9505 * Strings can no longer be mutated through index assignment.
9506 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9507 hash delimiters, as in `r###"foo"###`.
9508 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9510 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9511 * `@fn`s have been removed.
9512 * `do` only works with procs in order to make it obvious what the cost
9514 * Single-element tuple-like structs can no longer be dereferenced to
9515 obtain the inner value. A more comprehensive solution for overloading
9516 the dereference operator will be provided in the future.
9517 * The `#[link(...)]` attribute has been replaced with
9518 `#[crate_id = "name#vers"]`.
9519 * Empty `impl`s must be terminated with empty braces and may not be
9520 terminated with a semicolon.
9521 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9522 no longer has any special meaning.
9523 * The old `fmt!` string formatting macro has been removed.
9524 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9525 `print!` and `println!`.
9526 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9527 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9528 `extern mod foo = "bar"` instead.
9529 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9530 * Macros can have attributes.
9531 * Macros can expand to items with attributes.
9532 * Macros can expand to multiple items.
9533 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9534 * Comments may be nested.
9535 * Values automatically coerce to trait objects they implement, without
9537 * Enum discriminants are no longer an entire word but as small as needed to
9538 contain all the variants. The `repr` attribute can be used to override
9539 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9540 `#[repr(C)]` to match C enums.
9541 * Non-string literals are not allowed in attributes (they never worked).
9542 * The FFI now supports variadic functions.
9543 * Octal numeric literals, as in `0o7777`.
9544 * The `concat!` syntax extension performs compile-time string concatenation.
9545 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9546 removed as Rust no longer uses segmented stacks.
9547 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9548 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9549 not `*`; ignoring remaining fields of a struct is also done with `..`,
9550 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9551 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9552 * `rustc` supports the "system" calling convention, which defaults to the
9553 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9555 * The `type_overflow` lint (default: warn) checks literals for overflow.
9556 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9557 * The `attribute_usage` lint (default: warn) warns about unknown
9559 * The `unknown_features` lint (default: warn) warns about unknown
9561 * The `dead_code` lint (default: warn) checks for dead code.
9562 * Rust libraries can be linked statically to one another
9563 * `#[link_args]` is behind the `link_args` feature gate.
9564 * Native libraries are now linked with `#[link(name = "foo")]`
9565 * Native libraries can be statically linked to a rust crate
9566 (`#[link(name = "foo", kind = "static")]`).
9567 * Native OS X frameworks are now officially supported
9568 (`#[link(name = "foo", kind = "framework")]`).
9569 * The `#[thread_local]` attribute creates thread-local (not task-local)
9570 variables. Currently behind the `thread_local` feature gate.
9571 * The `return` keyword may be used in closures.
9572 * Types that can be copied via a memcpy implement the `Pod` kind.
9573 * The `cfg` attribute can now be used on struct fields and enum variants.
9576 * std: The `option` and `result` API's have been overhauled to make them
9577 simpler, more consistent, and more composable.
9578 * std: The entire `std::io` module has been replaced with one that is
9579 more comprehensive and that properly interfaces with the underlying
9580 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9582 * std: `io::util` contains a number of useful implementations of
9583 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9584 `ZeroReader`, `TeeReader`.
9585 * std: The reference counted pointer type `extra::rc` moved into std.
9586 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9587 just a wrapper around it).
9588 * std: The `Either` type has been removed.
9589 * std: `fmt::Default` can be implemented for any type to provide default
9590 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9591 * std: The `rand` API continues to be tweaked.
9592 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9593 on failure in gdb, is now named `rust_fail`.
9594 * std: The `each_key` and `each_value` methods on `HashMap` have been
9595 replaced by the `keys` and `values` iterators.
9596 * std: Functions dealing with type size and alignment have moved from the
9597 `sys` module to the `mem` module.
9598 * std: The `path` module was written and API changed.
9599 * std: `str::from_utf8` has been changed to cast instead of allocate.
9600 * std: `starts_with` and `ends_with` methods added to vectors via the
9601 `ImmutableEqVector` trait, which is in the prelude.
9602 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9603 if the index is out of bounds.
9604 * std: Task failure no longer propagates between tasks, as the model was
9605 complex, expensive, and incompatible with thread-based tasks.
9606 * std: The `Any` type can be used for dynamic typing.
9607 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9609 * std: Methods that produce iterators generally do not have an `_iter`
9611 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9612 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9613 * std: `util::ignore` renamed to `prelude::drop`.
9614 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9616 * std: `vec::raw` has seen a lot of cleanup and API changes.
9617 * std: The standard library no longer includes any C++ code, and very
9618 minimal C, eliminating the dependency on libstdc++.
9619 * std: Runtime scheduling and I/O functionality has been factored out into
9620 extensible interfaces and is now implemented by two different crates:
9621 libnative, for native threading and I/O; and libgreen, for green threading
9622 and I/O. This paves the way for using the standard library in more limited
9623 embedded environments.
9624 * std: The `comm` module has been rewritten to be much faster, have a
9625 simpler, more consistent API, and to work for both native and green
9627 * std: All libuv dependencies have been moved into the rustuv crate.
9628 * native: New implementations of runtime scheduling on top of OS threads.
9629 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9631 * green: The green thread scheduler and message passing types are almost
9633 * extra: The `flatpipes` module had bitrotted and was removed.
9634 * extra: All crypto functions have been removed and Rust now has a policy of
9635 not reimplementing crypto in the standard library. In the future crypto
9636 will be provided by external crates with bindings to established libraries.
9637 * extra: `c_vec` has been modernized.
9638 * extra: The `sort` module has been removed. Use the `sort` method on
9642 * The `rust` and `rusti` commands have been removed, due to lack of
9644 * `rustdoc` was completely rewritten.
9645 * `rustdoc` can test code examples in documentation.
9646 * `rustpkg` can test packages with the argument, 'test'.
9647 * `rustpkg` supports arbitrary dependencies, including C libraries.
9648 * `rustc`'s support for generating debug info is improved again.
9649 * `rustc` has better error reporting for unbalanced delimiters.
9650 * `rustc`'s JIT support was removed due to bitrot.
9651 * Executables and static libraries can be built with LTO (-Z lto)
9652 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9656 Version 0.8 (2013-09-26)
9657 ============================
9659 * ~2200 changes, numerous bugfixes
9662 * The `for` loop syntax has changed to work with the `Iterator` trait.
9663 * At long last, unwinding works on Windows.
9664 * Default methods are ready for use.
9665 * Many trait inheritance bugs fixed.
9666 * Owned and borrowed trait objects work more reliably.
9667 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9668 * rustc can omit emission of code for the `debug!` macro if it is passed
9670 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9671 for foo.rs, then foo/mod.rs, and will generate an error when both are
9673 * Strings no longer contain trailing nulls. The new `std::c_str` module
9674 provides new mechanisms for converting to C strings.
9675 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9676 * The FFI has been overhauled such that foreign functions are called directly,
9677 instead of through a stack-switching wrapper.
9678 * Calling a foreign function must be done through a Rust function with the
9679 `#[fixed_stack_segment]` attribute.
9680 * The `externfn!` macro can be used to declare both a foreign function and
9681 a `#[fixed_stack_segment]` wrapper at once.
9682 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9683 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9684 * `priv` is disallowed everywhere except for struct fields and enum variants.
9685 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9686 * `ref` bindings in irrefutable patterns work correctly now.
9687 * `char` is now prevented from containing invalid code points.
9688 * Casting to `bool` is no longer allowed.
9689 * `\0` is now accepted as an escape in chars and strings.
9690 * `yield` is a reserved keyword.
9691 * `typeof` is a reserved keyword.
9692 * Crates may be imported by URL with `extern mod foo = "url";`.
9693 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9694 * Static vectors can be initialized with repeating elements,
9695 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9696 * Static structs can be initialized with functional record update,
9697 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9698 * `cfg!` can be used to conditionally execute code based on the crate
9699 configuration, similarly to `#[cfg(...)]`.
9700 * The `unnecessary_qualification` lint detects unneeded module
9701 prefixes (default: allow).
9702 * Arithmetic operations have been implemented on the SIMD types in
9703 `std::unstable::simd`.
9704 * Exchange allocation headers were removed, reducing memory usage.
9705 * `format!` implements a completely new, extensible, and higher-performance
9706 string formatting system. It will replace `fmt!`.
9707 * `print!` and `println!` write formatted strings (using the `format!`
9708 extension) to stdout.
9709 * `write!` and `writeln!` write formatted strings (using the `format!`
9710 extension) to the new Writers in `std::rt::io`.
9711 * The library section in which a function or static is placed may
9712 be specified with `#[link_section = "..."]`.
9713 * The `proto!` syntax extension for defining bounded message protocols
9715 * `macro_rules!` is hygienic for `let` declarations.
9716 * The `#[export_name]` attribute specifies the name of a symbol.
9717 * `unreachable!` can be used to indicate unreachable code, and fails
9721 * std: Transitioned to the new runtime, written in Rust.
9722 * std: Added an experimental I/O library, `rt::io`, based on the new
9724 * std: A new generic `range` function was added to the prelude, replacing
9725 `uint::range` and friends.
9726 * std: `range_rev` no longer exists. Since range is an iterator it can be
9727 reversed with `range(lo, hi).invert()`.
9728 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9729 renamed to `unwrap_or`.
9730 * std: The `iterator` module was renamed to `iter`.
9731 * std: Integral types now support the `checked_add`, `checked_sub`, and
9732 `checked_mul` operations for detecting overflow.
9733 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9735 * std: Methods are standardizing on conventions for casting methods:
9736 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9738 * std: The `CString` type in `c_str` provides new ways to convert to and
9740 * std: `DoubleEndedIterator` can yield elements in two directions.
9741 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9743 * std: `str::from_bytes` renamed to `str::from_utf8`.
9744 * std: `pop_opt` and `shift_opt` methods added to vectors.
9745 * std: The task-local data interface no longer uses @, and keys are
9746 no longer function pointers.
9747 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9748 * std: Added `SharedPort` to `comm`.
9749 * std: `Eq` has a default method for `ne`; only `eq` is required
9751 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9752 is required in implementations.
9753 * std: `is_utf8` performance is improved, impacting many string functions.
9754 * std: `os::MemoryMap` provides cross-platform mmap.
9755 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9756 are not 'in-bounds' are considered undefined.
9757 * std: Many freestanding functions in `vec` removed in favor of methods.
9758 * std: Many freestanding functions on scalar types removed in favor of
9760 * std: Many options to task builders were removed since they don't make
9761 sense in the new scheduler design.
9762 * std: More containers implement `FromIterator` so can be created by the
9764 * std: More complete atomic types in `unstable::atomics`.
9765 * std: `comm::PortSet` removed.
9766 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9767 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9768 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9769 default implementations.
9770 * std: Various `from_str` functions were removed in favor of a generic
9771 `from_str` which is available in the prelude.
9772 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9773 * extra: `dlist`, the doubly-linked list was modernized.
9774 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9775 * extra: Added `glob` module, replacing `std::os::glob`.
9776 * extra: `rope` was removed.
9777 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9778 * extra: `net`, and `timer` were removed. The experimental replacements
9779 are `std::rt::io::net` and `std::rt::io::timer`.
9780 * extra: Iterators implemented for `SmallIntMap`.
9781 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9782 * extra: `SmallIntSet` removed. Use `BitvSet`.
9783 * extra: Performance of JSON parsing greatly improved.
9784 * extra: `semver` updated to SemVer 2.0.0.
9785 * extra: `term` handles more terminals correctly.
9786 * extra: `dbg` module removed.
9787 * extra: `par` module removed.
9788 * extra: `future` was cleaned up, with some method renames.
9789 * extra: Most free functions in `getopts` were converted to methods.
9792 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9793 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9794 similarly to gcc's `--march` flag.
9795 * rustc's performance compiling small crates is much better.
9796 * rustpkg has received many improvements.
9797 * rustpkg supports git tags as package IDs.
9798 * rustpkg builds into target-specific directories so it can be used for
9800 * The number of concurrent test tasks is controlled by the environment
9801 variable RUST_TEST_TASKS.
9802 * The test harness can now report metrics for benchmarks.
9803 * All tools have man pages.
9804 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9805 * The runtime uses jemalloc for allocations.
9806 * Segmented stacks are temporarily disabled as part of the transition to
9807 the new runtime. Stack overflows are possible!
9808 * A new documentation backend, rustdoc_ng, is available for use. It is
9809 still invoked through the normal `rustdoc` command.
9812 Version 0.7 (2013-07-03)
9813 =======================
9815 * ~2000 changes, numerous bugfixes
9818 * `impl`s no longer accept a visibility qualifier. Put them on methods
9820 * The borrow checker has been rewritten with flow-sensitivity, fixing
9821 many bugs and inconveniences.
9822 * The `self` parameter no longer implicitly means `&'self self`,
9823 and can be explicitly marked with a lifetime.
9824 * Overloadable compound operators (`+=`, etc.) have been temporarily
9825 removed due to bugs.
9826 * The `for` loop protocol now requires `for`-iterators to return `bool`
9827 so they compose better.
9828 * The `Durable` trait is replaced with the `'static` bounds.
9829 * Trait default methods work more often.
9830 * Structs with the `#[packed]` attribute have byte alignment and
9831 no padding between fields.
9832 * Type parameters bound by `Copy` must now be copied explicitly with
9834 * It is now illegal to move out of a dereferenced unsafe pointer.
9835 * `Option<~T>` is now represented as a nullable pointer.
9836 * `@mut` does dynamic borrow checks correctly.
9837 * The `main` function is only detected at the topmost level of the crate.
9838 The `#[main]` attribute is still valid anywhere.
9839 * Struct fields may no longer be mutable. Use inherited mutability.
9840 * The `#[no_send]` attribute makes a type that would otherwise be
9842 * The `#[no_freeze]` attribute makes a type that would otherwise be
9844 * Unbounded recursion will abort the process after reaching the limit
9845 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9846 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9847 are never implicitly copyable.
9848 * `#[static_assert]` makes compile-time assertions about static bools.
9849 * At long last, 'argument modes' no longer exist.
9850 * The rarely used `use mod` statement no longer exists.
9853 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9855 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9856 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9858 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9859 and unsuffixed integer literals.
9862 * The `core` crate was renamed to `std`.
9863 * The `std` crate was renamed to `extra`.
9864 * More and improved documentation.
9865 * std: `iterator` module for external iterator objects.
9866 * Many old-style (internal, higher-order function) iterators replaced by
9867 implementations of `Iterator`.
9868 * std: Many old internal vector and string iterators,
9869 incl. `any`, `all`. removed.
9870 * std: The `finalize` method of `Drop` renamed to `drop`.
9871 * std: The `drop` method now takes `&mut self` instead of `&self`.
9872 * std: The prelude no longer re-exports any modules, only types and traits.
9873 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9874 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9875 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9876 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9877 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9878 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9879 * std: Many types implement `Clone`.
9880 * std: `path` type renamed to `Path`.
9881 * std: `mut` module and `Mut` type removed.
9882 * std: Many standalone functions removed in favor of methods and iterators
9883 in `vec`, `str`. In the future methods will also work as functions.
9884 * std: `reinterpret_cast` removed. Use `transmute`.
9885 * std: ascii string handling in `std::ascii`.
9886 * std: `Rand` is implemented for ~/@.
9887 * std: `run` module for spawning processes overhauled.
9888 * std: Various atomic types added to `unstable::atomic`.
9889 * std: Various types implement `Zero`.
9890 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9891 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9892 * std: Added `os::mkdir_recursive`.
9893 * std: Added `os::glob` function performs filesystems globs.
9894 * std: `FuzzyEq` renamed to `ApproxEq`.
9895 * std: `Map` now defines `pop` and `swap` methods.
9896 * std: `Cell` constructors converted to static methods.
9897 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9898 * extra: `flate` module moved from `std` to `extra`.
9899 * extra: `fileinput` module for iterating over a series of files.
9900 * extra: `Complex` number type and `complex` module.
9901 * extra: `Rational` number type and `rational` module.
9902 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9903 * extra: `term` uses terminfo now, is more correct.
9904 * extra: `arc` functions converted to methods.
9905 * extra: Implementation of fixed output size variations of SHA-2.
9908 * `unused_variables` lint mode for unused variables (default: warn).
9909 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9911 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9913 * `dead_assignment` lint mode for unread variables (default: warn).
9914 * `unnecessary_allocation` lint mode detects some heap allocations that are
9915 immediately borrowed so could be written without allocating (default: warn).
9916 * `missing_doc` lint mode (default: allow).
9917 * `unreachable_code` lint mode (default: warn).
9918 * The `rusti` command has been rewritten and a number of bugs addressed.
9919 * rustc outputs in color on more terminals.
9920 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9921 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9922 * Compiling with `-g` will make the binary record information about
9923 dynamic borrowcheck failures for debugging.
9924 * rustdoc has a nicer stylesheet.
9925 * Various improvements to rustdoc.
9926 * Improvements to rustpkg (see the detailed release notes).
9929 Version 0.6 (2013-04-03)
9930 ========================
9932 * ~2100 changes, numerous bugfixes
9935 * The self type parameter in traits is now spelled `Self`
9936 * The `self` parameter in trait and impl methods must now be explicitly
9937 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9938 * Static methods no longer require the `static` keyword and instead
9939 are distinguished by the lack of a `self` parameter
9940 * Replaced the `Durable` trait with the `'static` lifetime
9941 * The old closure type syntax with the trailing sigil has been
9942 removed in favor of the more consistent leading sigil
9943 * `super` is a keyword, and may be prefixed to paths
9944 * Trait bounds are separated with `+` instead of whitespace
9945 * Traits are implemented with `impl Trait for Type`
9946 instead of `impl Type: Trait`
9947 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9948 * The `export` keyword has finally been removed
9949 * The `move` keyword has been removed (see "Semantic changes")
9950 * The interior mutability qualifier on vectors, `[mut T]`, has been
9951 removed. Use `&mut [T]`, etc.
9952 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9953 * `fail` is no longer a keyword. Use `fail!()`
9954 * `assert` is no longer a keyword. Use `assert!()`
9955 * `log` is no longer a keyword. use `debug!`, etc.
9956 * 1-tuples may be represented as `(T,)`
9957 * Struct fields may no longer be `mut`. Use inherited mutability,
9958 `@mut T`, `core::mut` or `core::cell`
9959 * `extern mod { ... }` is no longer valid syntax for foreign
9960 function modules. Use extern blocks: `extern { ... }`
9961 * Newtype enums removed. Use tuple-structs.
9962 * Trait implementations no longer support visibility modifiers
9963 * Pattern matching over vectors improved and expanded
9964 * `const` renamed to `static` to correspond to lifetime name,
9965 and make room for future `static mut` unsafe mutable globals.
9966 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9967 * `Clone` implementations can be automatically generated with
9968 `#[deriving(Clone)]`
9969 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9970 instead of `foo as Bar`.
9971 * Fixed length vector types are now written as `[int, .. 3]`
9972 instead of `[int * 3]`.
9973 * Fixed length vector types can express the length as a constant
9974 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9977 * Types with owned pointers or custom destructors move by default,
9978 eliminating the `move` keyword
9979 * All foreign functions are considered unsafe
9980 * &mut is now unaliasable
9981 * Writes to borrowed @mut pointers are prevented dynamically
9983 * The name of the main function can be customized using #[main]
9984 * The default type of an inferred closure is &fn instead of @fn
9985 * `use` statements may no longer be "chained" - they cannot import
9986 identifiers imported by previous `use` statements
9987 * `use` statements are crate relative, importing from the "top"
9988 of the crate by default. Paths may be prefixed with `super::`
9989 or `self::` to change the search behavior.
9990 * Method visibility is inherited from the implementation declaration
9991 * Structural records have been removed
9992 * Many more types can be used in static items, including enums
9993 'static-lifetime pointers and vectors
9994 * Pattern matching over vectors improved and expanded
9995 * Typechecking of closure types has been overhauled to
9996 improve inference and eliminate unsoundness
9997 * Macros leave scope at the end of modules, unless that module is
9998 tagged with #[macro_escape]
10001 * Added big integers to `std::bigint`
10002 * Removed `core::oldcomm` module
10003 * Added pipe-based `core::comm` module
10004 * Numeric traits have been reorganized under `core::num`
10005 * `vec::slice` finally returns a slice
10006 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10007 * Containers reorganized around traits in `core::container`
10008 * `core::dvec` removed, `~[T]` is a drop-in replacement
10009 * `core::send_map` renamed to `core::hashmap`
10010 * `std::map` removed; replaced with `core::hashmap`
10011 * `std::treemap` reimplemented as an owned balanced tree
10012 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10013 * `core::trie` added as a fast ordered map for integer keys
10014 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10015 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10016 overload the comparison operators, whereas `TotalOrd` is used
10017 by certain container types
10020 * Replaced the 'cargo' package manager with 'rustpkg'
10021 * Added all-purpose 'rust' tool
10022 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10023 * rustc now *attempts* to offer spelling suggestions
10024 * Improved support for ARM and Android
10025 * Preliminary MIPS backend
10026 * Improved foreign function ABI implementation for x86, x86_64
10027 * Various memory usage improvements
10028 * Rust code may be embedded in foreign code under limited circumstances
10029 * Inline assembler supported by new asm!() syntax extension.
10032 Version 0.5 (2012-12-21)
10033 ===========================
10035 * ~900 changes, numerous bugfixes
10038 * Removed `<-` move operator
10039 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10040 * Removed old fixed length vector syntax - `[T]/N`
10041 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10042 * Macros may now expand to items and statements
10043 * `a.b()` is always parsed as a method call, never as a field projection
10044 * `Eq` and `IterBytes` implementations can be automatically generated
10045 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10046 * Removed the special crate language for `.rc` files
10047 * Function arguments may consist of any irrefutable pattern
10050 * `&` and `~` pointers may point to objects
10051 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10052 * Enum variants may be structs
10053 * Destructors can be added to all nominal types with the Drop trait
10054 * Structs and nullary enum variants may be constants
10055 * Values that cannot be implicitly copied are now automatically moved
10056 without writing `move` explicitly
10057 * `&T` may now be coerced to `*T`
10058 * Coercions happen in `let` statements as well as function calls
10059 * `use` statements now take crate-relative paths
10060 * The module and type namespaces have been merged so that static
10061 method names can be resolved under the trait in which they are
10064 * Improved support for language features
10065 * Trait inheritance works in many scenarios
10066 * More support for explicit self arguments in methods - `self`, `&self`
10067 `@self`, and `~self` all generally work as expected
10068 * Static methods work in more situations
10069 * Experimental: Traits may declare default methods for the implementations
10073 * New condition handling system in `core::condition`
10074 * Timsort added to `std::sort`
10075 * New priority queue, `std::priority_queue`
10076 * Pipes for serializable types, `std::flatpipes'
10077 * Serialization overhauled to be trait-based
10078 * Expanded `getopts` definitions
10079 * Moved futures to `std`
10080 * More functions are pure now
10081 * `core::comm` renamed to `oldcomm`. Still deprecated
10082 * `rustdoc` and `cargo` are libraries now
10085 * Added a preliminary REPL, `rusti`
10086 * License changed from MIT to dual MIT/APL2
10089 Version 0.4 (2012-10-15)
10090 ==========================
10092 * ~2000 changes, numerous bugfixes
10095 * All keywords are now strict and may not be used as identifiers anywhere
10096 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10097 'of', 'with', 'to', 'class'.
10098 * Classes are replaced with simpler structs
10099 * Explicit method self types
10100 * `ret` became `return` and `alt` became `match`
10101 * `import` is now `use`; `use is now `extern mod`
10102 * `extern mod { ... }` is now `extern { ... }`
10103 * `use mod` is the recommended way to import modules
10104 * `pub` and `priv` replace deprecated export lists
10105 * The syntax of `match` pattern arms now uses fat arrow (=>)
10106 * `main` no longer accepts an args vector; use `os::args` instead
10109 * Trait implementations are now coherent, ala Haskell typeclasses
10110 * Trait methods may be static
10111 * Argument modes are deprecated
10112 * Borrowed pointers are much more mature and recommended for use
10113 * Strings and vectors in the static region are stored in constant memory
10114 * Typestate was removed
10115 * Resolution rewritten to be more reliable
10116 * Support for 'dual-mode' data structures (freezing and thawing)
10119 * Most binary operators can now be overloaded via the traits in
10121 * `std::net::url` for representing URLs
10122 * Sendable hash maps in `core::send_map`
10123 * `core::task' gained a (currently unsafe) task-local storage API
10126 * An efficient new intertask communication primitive called the pipe,
10127 along with a number of higher-level channel types, in `core::pipes`
10128 * `std::arc`, an atomically reference counted, immutable, shared memory
10130 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10131 * Futures are now based on pipes and sendable
10132 * More robust linked task failure
10133 * Improved task builder API
10136 * Improved error reporting
10137 * Preliminary JIT support
10138 * Preliminary work on precise GC
10139 * Extensive architectural improvements to rustc
10140 * Begun a transition away from buggy C++-based reflection (shape) code to
10141 Rust-based (visitor) code
10142 * All hash functions and tables converted to secure, randomized SipHash
10145 Version 0.3 (2012-07-12)
10146 ========================
10148 * ~1900 changes, numerous bugfixes
10150 * New coding conveniences
10151 * Integer-literal suffix inference
10152 * Per-item control over warnings, errors
10153 * #[cfg(windows)] and #[cfg(unix)] attributes
10154 * Documentation comments
10155 * More compact closure syntax
10156 * 'do' expressions for treating higher-order functions as
10158 * *-patterns (wildcard extended to all constructor fields)
10161 * Name resolution pass and exhaustiveness checker rewritten
10162 * Region pointers and borrow checking supersede alias
10164 * Init-ness checking is now provided by a region-based liveness
10165 pass instead of the typestate pass; same for last-use analysis
10166 * Extensive work on region pointers
10168 * Experimental new language features
10169 * Slices and fixed-size, interior-allocated vectors
10170 * #!-comments for lang versioning, shell execution
10171 * Destructors and iface implementation for classes;
10172 type-parameterized classes and class methods
10173 * 'const' type kind for types that can be used to implement
10174 shared-memory concurrency patterns
10178 * Removal of various obsolete features
10179 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10180 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10182 * Constructs: do-while loops ('do' repurposed), fn binding,
10183 resources (replaced by destructors)
10185 * Compiler reorganization
10186 * Syntax-layer of compiler split into separate crate
10187 * Clang (from LLVM project) integrated into build
10188 * Typechecker split into sub-modules
10191 * New time functions
10192 * Extension methods for many built-in types
10193 * Arc: atomic-refcount read-only / exclusive-use shared cells
10194 * Par: parallel map and search routines
10195 * Extensive work on libuv interface
10196 * Much vector code moved to libraries
10197 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10198 #include, #include_str, #include_bin
10200 * Tool improvements
10201 * Cargo automatically resolves dependencies
10204 Version 0.2 (2012-03-29)
10205 =========================
10207 * >1500 changes, numerous bugfixes
10209 * New docs and doc tooling
10211 * New port: FreeBSD x86_64
10213 * Compilation model enhancements
10214 * Generics now specialized, multiply instantiated
10215 * Functions now inlined across separate crates
10217 * Scheduling, stack and threading fixes
10218 * Noticeably improved message-passing performance
10219 * Explicit schedulers
10223 * Experimental new language features
10224 * Operator overloading
10228 * Various language extensions
10229 * C-callback function types: 'crust fn ...'
10230 * Infinite-loop construct: 'loop { ... }'
10231 * Shorten 'mutable' to 'mut'
10232 * Required mutable-local qualifier: 'let mut ...'
10233 * Basic glob-exporting: 'export foo::*;'
10234 * Alt now exhaustive, 'alt check' for runtime-checked
10235 * Block-function form of 'for' loop, with 'break' and 'ret'.
10238 * AST quasi-quote syntax extension
10239 * Revived libuv interface
10240 * New modules: core::{future, iter}, std::arena
10241 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10242 * Extensive cleanup, regularization in libstd, libcore
10245 Version 0.1 (2012-01-20)
10246 ===============================
10248 * Most language features work, including:
10249 * Unique pointers, unique closures, move semantics
10250 * Interface-constrained generics
10251 * Static interface dispatch
10253 * Multithread task scheduling
10254 * Typestate predicates
10255 * Failure unwinding, destructors
10256 * Pattern matching and destructuring assignment
10257 * Lightweight block-lambda syntax
10258 * Preliminary macro-by-example
10260 * Compiler works with the following configurations:
10261 * Linux: x86 and x86_64 hosts and targets
10262 * macOS: x86 and x86_64 hosts and targets
10263 * Windows: x86 hosts and targets
10265 * Cross compilation / multi-target configuration supported.
10267 * Preliminary API-documentation and package-management tools included.
10271 * Documentation is incomplete.
10273 * Performance is below intended target.
10275 * Standard library APIs are subject to extensive change, reorganization.
10277 * Language-level versioning is not yet operational - future code will
10278 break unexpectedly.