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].
116 These changes provide no direct user facing benefits, but represent significant
117 improvements to the internals and overall performance of rustc and
120 - [Rework the `std::sys::windows::alloc` implementation.][83065]
121 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
122 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
123 - [Rework rustdoc const type][82873]
125 [83386]: https://github.com/rust-lang/rust/pull/83386
126 [82771]: https://github.com/rust-lang/rust/pull/82771
127 [84147]: https://github.com/rust-lang/rust/pull/84147
128 [84082]: https://github.com/rust-lang/rust/pull/84082
129 [83799]: https://github.com/rust-lang/rust/pull/83799
130 [83681]: https://github.com/rust-lang/rust/pull/83681
131 [83652]: https://github.com/rust-lang/rust/pull/83652
132 [83387]: https://github.com/rust-lang/rust/pull/83387
133 [82873]: https://github.com/rust-lang/rust/pull/82873
134 [82864]: https://github.com/rust-lang/rust/pull/82864
135 [82608]: https://github.com/rust-lang/rust/pull/82608
136 [82565]: https://github.com/rust-lang/rust/pull/82565
137 [80525]: https://github.com/rust-lang/rust/pull/80525
138 [79278]: https://github.com/rust-lang/rust/pull/79278
139 [78618]: https://github.com/rust-lang/rust/pull/78618
140 [77704]: https://github.com/rust-lang/rust/pull/77704
141 [83941]: https://github.com/rust-lang/rust/pull/83941
142 [83065]: https://github.com/rust-lang/rust/pull/83065
143 [81764]: https://github.com/rust-lang/rust/pull/81764
144 [81469]: https://github.com/rust-lang/rust/pull/81469
145 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
146 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
147 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
148 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
149 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
150 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
151 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
152 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
153 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
154 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
155 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
156 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
157 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
158 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
159 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
160 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
161 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
162 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
163 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
164 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
165 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
166 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
167 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
168 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
169 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
170 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
171 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
172 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
173 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
174 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
175 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
176 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
177 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
178 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
179 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
180 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
181 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
182 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
183 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
184 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
185 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
186 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
189 Version 1.52.1 (2021-05-10)
190 ============================
192 This release disables incremental compilation, unless the user has explicitly
193 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
195 This is due to the widespread, and frequently occuring, breakage encountered by
196 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
197 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
198 newly added incremental verification are still present in past stable versions,
199 and are not yet fixed on any channel. These bugs can lead to miscompilation of
202 These problems only affect incremental builds, so release builds with Cargo
203 should not be affected unless the user has explicitly opted into incremental.
204 Debug and check builds are affected.
206 See [84970] for more details.
208 [84970]: https://github.com/rust-lang/rust/issues/84970
210 Version 1.52.0 (2021-05-06)
211 ============================
215 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
216 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
217 is allowed by default, and may become a warning or hard error in a
219 - [You can now cast mutable references to arrays to a pointer of the same type as
224 - [Upgraded the default LLVM to LLVM 12.][81451]
226 Added tier 3\* support for the following targets.
228 - [`s390x-unknown-linux-musl`][82166]
229 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
230 - [`powerpc-unknown-openbsd`][82733]
232 \* Refer to Rust's [platform support page][platform-support-doc] for more
233 information on Rust's tiered platform support.
237 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
238 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
239 - [`Arc<impl Error>` now implements `error::Error`.][80553]
240 - [All integer division and remainder operations are now `const`.][80962]
244 - [`Arguments::as_str`]
246 - [`char::REPLACEMENT_CHARACTER`]
247 - [`char::UNICODE_VERSION`]
248 - [`char::decode_utf16`]
249 - [`char::from_digit`]
250 - [`char::from_u32_unchecked`]
252 - [`slice::partition_point`]
253 - [`str::rsplit_once`]
254 - [`str::split_once`]
256 The following previously stable APIs are now `const`.
259 - [`char::len_utf16`]
260 - [`char::to_ascii_uppercase`]
261 - [`char::to_ascii_lowercase`]
262 - [`char::eq_ignore_ascii_case`]
263 - [`u8::to_ascii_uppercase`]
264 - [`u8::to_ascii_lowercase`]
265 - [`u8::eq_ignore_ascii_case`]
269 - [Rustdoc lints are now treated as a tool lint, meaning that
270 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
271 Using the old style is still allowed, and will become a warning in
273 - [Rustdoc now supports argument files.][82261]
274 - [Rustdoc now generates smart punctuation for documentation.][79423]
275 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
283 - [You can now pass multiple filters to tests.][81356] E.g.
284 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
285 - [Rustup now distributes PDB symbols for the `std` library on Windows,
286 allowing you to see `std` symbols when debugging.][82218]
290 These changes provide no direct user facing benefits, but represent significant
291 improvements to the internals and overall performance of rustc and
294 - [Check the result cache before the DepGraph when ensuring queries][81855]
295 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
296 - [Only store a LocalDefId in some HIR nodes][81611]
297 - [Store HIR attributes in a side table][79519]
301 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
302 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
303 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
304 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
305 languages in code blocks.][78429]
306 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
307 - [Changes in how proc macros handle whitespace may lead to panics when used
308 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
310 [84136]: https://github.com/rust-lang/rust/issues/84136
311 [80763]: https://github.com/rust-lang/rust/pull/80763
312 [82166]: https://github.com/rust-lang/rust/pull/82166
313 [82121]: https://github.com/rust-lang/rust/pull/82121
314 [81879]: https://github.com/rust-lang/rust/pull/81879
315 [82261]: https://github.com/rust-lang/rust/pull/82261
316 [82218]: https://github.com/rust-lang/rust/pull/82218
317 [82216]: https://github.com/rust-lang/rust/pull/82216
318 [82202]: https://github.com/rust-lang/rust/pull/82202
319 [81855]: https://github.com/rust-lang/rust/pull/81855
320 [81766]: https://github.com/rust-lang/rust/pull/81766
321 [81744]: https://github.com/rust-lang/rust/pull/81744
322 [81611]: https://github.com/rust-lang/rust/pull/81611
323 [81479]: https://github.com/rust-lang/rust/pull/81479
324 [81451]: https://github.com/rust-lang/rust/pull/81451
325 [81356]: https://github.com/rust-lang/rust/pull/81356
326 [80962]: https://github.com/rust-lang/rust/pull/80962
327 [80553]: https://github.com/rust-lang/rust/pull/80553
328 [80527]: https://github.com/rust-lang/rust/pull/80527
329 [79519]: https://github.com/rust-lang/rust/pull/79519
330 [79423]: https://github.com/rust-lang/rust/pull/79423
331 [79208]: https://github.com/rust-lang/rust/pull/79208
332 [78429]: https://github.com/rust-lang/rust/pull/78429
333 [82733]: https://github.com/rust-lang/rust/pull/82733
334 [82594]: https://github.com/rust-lang/rust/pull/82594
335 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
336 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
337 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
338 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
339 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
340 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
341 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
342 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
343 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
344 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
345 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
346 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
347 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
348 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
349 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
350 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
351 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
352 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
353 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
354 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
355 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
356 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
358 Version 1.51.0 (2021-03-25)
359 ============================
363 - [You can now parameterize items such as functions, traits, and `struct`s by constant
364 values in addition to by types and lifetimes.][79135] Also known as "const generics"
365 E.g. you can now write the following. Note: Only values of primitive integers,
366 `bool`, or `char` types are currently permitted.
368 struct GenericArray<T, const LENGTH: usize> {
372 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
373 const fn last(&self) -> Option<&T> {
377 Some(&self.inner[LENGTH - 1])
387 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
388 This option controls whether debug information is split across multiple files
389 or packed into a single file. **Note** This option is unstable on other platforms.
390 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
391 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
392 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
393 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
395 \* Refer to Rust's [platform support page][platform-support-doc] for more
396 information on Rust's tiered platform support.
401 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
402 - [`str` now implements `AsMut<str>`.][80279]
403 - [`u64` and `u128` now implement `From<char>`.][79502]
404 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
405 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
406 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
407 - [`io::Empty` now implements `io::Seek`.][78044]
408 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
409 `T: ?Sized` types.][80764]
410 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
416 - [`Arc::decrement_strong_count`]
417 - [`Arc::increment_strong_count`]
418 - [`Once::call_once_force`]
419 - [`Peekable::next_if_eq`]
420 - [`Peekable::next_if`]
421 - [`Seek::stream_position`]
422 - [`array::IntoIter`]
423 - [`panic::panic_any`]
425 - [`ptr::addr_of_mut!`]
426 - [`slice::fill_with`]
427 - [`slice::split_inclusive_mut`]
428 - [`slice::split_inclusive`]
429 - [`slice::strip_prefix`]
430 - [`slice::strip_suffix`]
431 - [`str::split_inclusive`]
432 - [`sync::OnceState`]
434 - [`VecDeque::range`]
435 - [`VecDeque::range_mut`]
439 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
440 codegen option.][cargo/9112]
441 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
442 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
443 to avoid unifying features of dependencies where that unification could be unwanted.
444 Such as using the same dependency with a `std` feature in a build scripts and
445 proc-macros, while using the `no-std` feature in the final binary. See the
446 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
451 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
452 - [You can now provide a `--default-theme` flag which sets the default theme to use for
453 documentation.][79642]
455 Various improvements to intra-doc links:
457 - [You can link to non-path primitives such as `slice`.][80181]
458 - [You can link to associated items.][74489]
459 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
463 - [You can now pass `--include-ignored` to tests (e.g. with
464 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
469 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
470 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
472 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
473 for the distributed artifacts.][81521]
474 - `armv5te-unknown-linux-gnueabi`
475 - `sparc64-unknown-linux-gnu`
476 - `thumbv7neon-unknown-linux-gnueabihf`
477 - `armv7-unknown-linux-gnueabi`
478 - `x86_64-unknown-linux-gnux32`
479 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
484 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
486 [79135]: https://github.com/rust-lang/rust/pull/79135
487 [74489]: https://github.com/rust-lang/rust/pull/74489
488 [76934]: https://github.com/rust-lang/rust/pull/76934
489 [79570]: https://github.com/rust-lang/rust/pull/79570
490 [80181]: https://github.com/rust-lang/rust/pull/80181
491 [79642]: https://github.com/rust-lang/rust/pull/79642
492 [80945]: https://github.com/rust-lang/rust/pull/80945
493 [80279]: https://github.com/rust-lang/rust/pull/80279
494 [80053]: https://github.com/rust-lang/rust/pull/80053
495 [79502]: https://github.com/rust-lang/rust/pull/79502
496 [75180]: https://github.com/rust-lang/rust/pull/75180
497 [79135]: https://github.com/rust-lang/rust/pull/79135
498 [81521]: https://github.com/rust-lang/rust/pull/81521
499 [80968]: https://github.com/rust-lang/rust/pull/80968
500 [80959]: https://github.com/rust-lang/rust/pull/80959
501 [80718]: https://github.com/rust-lang/rust/pull/80718
502 [80653]: https://github.com/rust-lang/rust/pull/80653
503 [80579]: https://github.com/rust-lang/rust/pull/80579
504 [79998]: https://github.com/rust-lang/rust/pull/79998
505 [78044]: https://github.com/rust-lang/rust/pull/78044
506 [81455]: https://github.com/rust-lang/rust/pull/81455
507 [80764]: https://github.com/rust-lang/rust/pull/80764
508 [80749]: https://github.com/rust-lang/rust/pull/80749
509 [80662]: https://github.com/rust-lang/rust/pull/80662
510 [79134]: https://github.com/rust-lang/rust/pull/79134
511 [80966]: https://github.com/rust-lang/rust/pull/80966
512 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
513 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
514 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
515 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
516 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
517 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
518 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
519 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
520 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
521 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
522 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
523 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
524 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
525 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
526 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
527 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
528 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
529 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
530 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
531 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
532 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
533 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
534 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
536 Version 1.50.0 (2021-02-11)
537 ============================
540 -----------------------
541 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
542 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
543 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
546 -----------------------
547 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
548 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
549 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
550 - [Dropped support for all cloudabi targets.][78439]
552 \* Refer to Rust's [platform support page][platform-support-doc] for more
553 information on Rust's tiered platform support.
556 -----------------------
558 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
559 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
560 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
561 This value cannot be a valid file descriptor, and now means `Option<File>` takes
562 up the same amount of space as `File`.
568 - [`btree_map::Entry::or_insert_with_key`]
571 - [`hash_map::Entry::or_insert_with_key`]
575 - [`UnsafeCell::get_mut`]
577 The following previously stable methods are now `const`.
579 - [`IpAddr::is_ipv4`]
580 - [`IpAddr::is_ipv6`]
581 - [`IpAddr::is_unspecified`]
582 - [`IpAddr::is_loopback`]
583 - [`IpAddr::is_multicast`]
584 - [`Ipv4Addr::octets`]
585 - [`Ipv4Addr::is_loopback`]
586 - [`Ipv4Addr::is_private`]
587 - [`Ipv4Addr::is_link_local`]
588 - [`Ipv4Addr::is_multicast`]
589 - [`Ipv4Addr::is_broadcast`]
590 - [`Ipv4Addr::is_documentation`]
591 - [`Ipv4Addr::to_ipv6_compatible`]
592 - [`Ipv4Addr::to_ipv6_mapped`]
593 - [`Ipv6Addr::segments`]
594 - [`Ipv6Addr::is_unspecified`]
595 - [`Ipv6Addr::is_loopback`]
596 - [`Ipv6Addr::is_multicast`]
597 - [`Ipv6Addr::to_ipv4`]
600 - [`Layout::from_size_align`]
601 - `pow` for all integer types.
602 - `checked_pow` for all integer types.
603 - `saturating_pow` for all integer types.
604 - `wrapping_pow` for all integer types.
605 - `next_power_of_two` for all unsigned integer types.
606 - `checked_next_power_of_two` for all unsigned integer types.
609 -----------------------
611 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
612 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
613 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
614 contents of that directory for changes.][cargo/8973]
615 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
620 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
621 - [Running tests will now print the total time taken to execute.][75752]
626 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
627 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
628 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
629 unhygenic `macro_rules!` macros.][79472]
630 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
631 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
632 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
633 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
634 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
635 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
637 [74989]: https://github.com/rust-lang/rust/pull/74989
638 [79261]: https://github.com/rust-lang/rust/pull/79261
639 [79896]: https://github.com/rust-lang/rust/pull/79896
640 [79484]: https://github.com/rust-lang/rust/pull/79484
641 [79472]: https://github.com/rust-lang/rust/pull/79472
642 [79270]: https://github.com/rust-lang/rust/pull/79270
643 [79003]: https://github.com/rust-lang/rust/pull/79003
644 [78864]: https://github.com/rust-lang/rust/pull/78864
645 [78636]: https://github.com/rust-lang/rust/pull/78636
646 [78439]: https://github.com/rust-lang/rust/pull/78439
647 [78343]: https://github.com/rust-lang/rust/pull/78343
648 [78296]: https://github.com/rust-lang/rust/pull/78296
649 [78068]: https://github.com/rust-lang/rust/pull/78068
650 [75752]: https://github.com/rust-lang/rust/pull/75752
651 [74699]: https://github.com/rust-lang/rust/pull/74699
652 [78142]: https://github.com/rust-lang/rust/pull/78142
653 [77484]: https://github.com/rust-lang/rust/pull/77484
654 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
655 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
656 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
657 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
658 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
659 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
660 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
661 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
662 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
663 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
664 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
665 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
666 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
667 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
668 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
669 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
670 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
671 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
672 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
673 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
674 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
675 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
676 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
677 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
678 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
679 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
680 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
681 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
682 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
683 [`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
684 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
685 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
686 [`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
687 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
690 Version 1.49.0 (2020-12-31)
691 ============================
694 -----------------------
696 - [Unions can now implement `Drop`, and you can now have a field in a union
697 with `ManuallyDrop<T>`.][77547]
698 - [You can now cast uninhabited enums to integers.][76199]
699 - [You can now bind by reference and by move in patterns.][76119] This
700 allows you to selectively borrow individual components of a type. E.g.
708 let person = Person {
709 name: String::from("Alice"),
713 // `name` is moved out of person, but `age` is referenced.
714 let Person { name, ref age } = person;
715 println!("{} {}", name, age);
719 -----------------------
721 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
722 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
723 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
724 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
725 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
726 - [Output from threads spawned in tests is now captured.][78227]
727 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
729 \* Refer to Rust's [platform support page][platform-support-doc] for more
730 information on Rust's tiered platform support.
733 -----------------------
735 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
736 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
741 - [`slice::select_nth_unstable`]
742 - [`slice::select_nth_unstable_by`]
743 - [`slice::select_nth_unstable_by_key`]
745 The following previously stable methods are now `const`.
748 - [`Poll::is_pending`]
751 -----------------------
752 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
753 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
754 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
755 variable will be set if the crate being built is one the user selected to build, either
756 with `-p` or through defaults.
757 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
763 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
764 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
765 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
766 Previously such invalid or unused attributes could be ignored.
767 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
768 read [this post about the changes][rustdoc-ws-post] for more details.
769 - [Trait bounds are no longer inferred for associated types.][79904]
773 These changes provide no direct user facing benefits, but represent significant
774 improvements to the internals and overall performance of rustc and
777 - [rustc's internal crates are now compiled using the `initial-exec` Thread
778 Local Storage model.][78201]
779 - [Calculate visibilities once in resolve.][78077]
780 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
781 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
784 [75991]: https://github.com/rust-lang/rust/pull/75991
785 [78951]: https://github.com/rust-lang/rust/pull/78951
786 [78848]: https://github.com/rust-lang/rust/pull/78848
787 [78746]: https://github.com/rust-lang/rust/pull/78746
788 [78376]: https://github.com/rust-lang/rust/pull/78376
789 [78228]: https://github.com/rust-lang/rust/pull/78228
790 [78227]: https://github.com/rust-lang/rust/pull/78227
791 [78201]: https://github.com/rust-lang/rust/pull/78201
792 [78109]: https://github.com/rust-lang/rust/pull/78109
793 [78077]: https://github.com/rust-lang/rust/pull/78077
794 [77997]: https://github.com/rust-lang/rust/pull/77997
795 [77703]: https://github.com/rust-lang/rust/pull/77703
796 [77547]: https://github.com/rust-lang/rust/pull/77547
797 [77015]: https://github.com/rust-lang/rust/pull/77015
798 [76199]: https://github.com/rust-lang/rust/pull/76199
799 [76119]: https://github.com/rust-lang/rust/pull/76119
800 [75914]: https://github.com/rust-lang/rust/pull/75914
801 [79004]: https://github.com/rust-lang/rust/pull/79004
802 [78676]: https://github.com/rust-lang/rust/pull/78676
803 [79904]: https://github.com/rust-lang/rust/issues/79904
804 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
805 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
806 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
807 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
808 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
809 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
810 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
811 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
812 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
813 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
814 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
816 Version 1.48.0 (2020-11-19)
817 ==========================
822 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
823 is still rejected *semantically*, but can now be parsed by procedural macros.
827 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
828 `rustc` whether to link its own C runtime and libraries or to rely on a external
829 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
830 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
831 Note: If you're using cargo you must explicitly pass the `--target` flag.
832 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
834 \* Refer to Rust's [platform support page][platform-support-doc] for more
835 information on Rust's tiered platform support.
839 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
840 and `&Stderr`.][76275]
841 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
842 - [The `matches!` macro now supports having a trailing comma.][74880]
843 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
844 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
848 - [`slice::as_ptr_range`]
849 - [`slice::as_mut_ptr_range`]
850 - [`VecDeque::make_contiguous`]
851 - [`future::pending`]
854 The following previously stable methods are now `const fn`'s:
856 - [`Option::is_some`]
857 - [`Option::is_none`]
862 - [`Ordering::reverse`]
870 - [You can now link to items in `rustdoc` using the intra-doc link
871 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
872 a link to `std::future`'s documentation. See ["Linking to items by
873 name"][intradoc-links] for more information.
874 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
875 when searching through `rustdoc`'s UI.][75740]
879 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
880 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
881 promoted to `'static` lifetime any more inside `const fn`s.
882 - [Associated type bindings on trait objects are now verified to meet the bounds
883 declared on the trait when checking that they implement the trait.][27675]
884 - [When trait bounds on associated types or opaque types are ambiguous, the
885 compiler no longer makes an arbitrary choice on which bound to use.][54121]
886 - [Fixed recursive nonterminals not being expanded in macros during
887 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
888 correctly handling recursive nonterminal tokens.
889 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
890 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
891 in places where they have no effect.][73461]
892 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
893 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
894 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
895 disallow zero-initialization.][71274]
896 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
897 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
898 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
899 see the [`catch_unwind`] documentation for further information.
905 These changes provide no direct user facing benefits, but represent significant
906 improvements to the internals and overall performance of rustc and
909 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
910 You can continue building with `make` by setting `ninja=false` in
912 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
913 - [Made `ensure_sufficient_stack()` non-generic][76680]
915 [78143]: https://github.com/rust-lang/rust/issues/78143
916 [76680]: https://github.com/rust-lang/rust/pull/76680/
917 [76030]: https://github.com/rust-lang/rust/pull/76030/
918 [70212]: https://github.com/rust-lang/rust/pull/70212/
919 [27675]: https://github.com/rust-lang/rust/issues/27675/
920 [54121]: https://github.com/rust-lang/rust/issues/54121/
921 [71274]: https://github.com/rust-lang/rust/pull/71274/
922 [77386]: https://github.com/rust-lang/rust/pull/77386/
923 [77153]: https://github.com/rust-lang/rust/pull/77153/
924 [77055]: https://github.com/rust-lang/rust/pull/77055/
925 [76275]: https://github.com/rust-lang/rust/pull/76275/
926 [76310]: https://github.com/rust-lang/rust/pull/76310/
927 [76420]: https://github.com/rust-lang/rust/pull/76420/
928 [76158]: https://github.com/rust-lang/rust/pull/76158/
929 [75857]: https://github.com/rust-lang/rust/pull/75857/
930 [75585]: https://github.com/rust-lang/rust/pull/75585/
931 [75740]: https://github.com/rust-lang/rust/pull/75740/
932 [75502]: https://github.com/rust-lang/rust/pull/75502/
933 [74880]: https://github.com/rust-lang/rust/pull/74880/
934 [74922]: https://github.com/rust-lang/rust/pull/74922/
935 [74430]: https://github.com/rust-lang/rust/pull/74430/
936 [74194]: https://github.com/rust-lang/rust/pull/74194/
937 [73461]: https://github.com/rust-lang/rust/pull/73461/
938 [73166]: https://github.com/rust-lang/rust/pull/73166/
939 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
940 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
941 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
942 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
943 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
944 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
945 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
946 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
947 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
948 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
949 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
950 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
951 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
952 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
953 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
956 Version 1.47.0 (2020-10-08)
957 ==========================
961 - [Closures will now warn when not used.][74869]
965 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
966 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
968 - [Upgraded to LLVM 11.][73526]
969 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
970 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
971 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
973 \* Refer to Rust's [platform support page][platform-support-doc] for more
974 information on Rust's tiered platform support.
978 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
979 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
980 those of length less than 33.][74060]
981 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
982 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
983 `PartialEq`, and `PartialOrd`.][73583]
988 - [`Range::is_empty`]
989 - [`RangeInclusive::is_empty`]
990 - [`Result::as_deref`]
991 - [`Result::as_deref_mut`]
993 - [`pointer::offset_from`]
997 The following previously stable APIs have now been made const.
999 - [The `new` method for all `NonZero` integers.][73858]
1000 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1001 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1002 methods for all integers.][73858]
1003 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1004 signed integers.][73858]
1005 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1006 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1007 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1008 `is_ascii_control` methods for `char` and `u8`.][73858]
1012 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1013 You can override this by setting the following in your `Cargo.toml`.
1015 [profile.release.build-override]
1018 - [`cargo-help` will now display man pages for commands rather just the
1019 `--help` text.][cargo/8456]
1020 - [`cargo-metadata` now emits a `test` field indicating if a target has
1021 tests enabled.][cargo/8478]
1022 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1023 - [`cargo-publish` will now use an alternative registry by default if it's the
1024 only registry specified in `package.publish`.][cargo/8571]
1028 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1029 type based search.][75366]
1030 - [Added the Ayu theme to rustdoc.][71237]
1034 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1035 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1036 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1037 help to preserve more span information.][73084] These changes may cause
1038 compiliation errors if your macro was unhygenic or didn't correctly handle
1040 - [Moved support for the CloudABI target to tier 3.][75568]
1041 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1042 - [Added the `rustc-docs` component.][75560] This allows you to install
1043 and read the documentation for the compiler internal APIs. (Currently only
1044 available for `x86_64-unknown-linux-gnu`.)
1049 - [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.
1051 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1052 [75048]: https://github.com/rust-lang/rust/pull/75048/
1053 [74163]: https://github.com/rust-lang/rust/pull/74163/
1054 [71237]: https://github.com/rust-lang/rust/pull/71237/
1055 [74869]: https://github.com/rust-lang/rust/pull/74869/
1056 [73858]: https://github.com/rust-lang/rust/pull/73858/
1057 [75716]: https://github.com/rust-lang/rust/pull/75716/
1058 [75908]: https://github.com/rust-lang/rust/pull/75908/
1059 [75516]: https://github.com/rust-lang/rust/pull/75516/
1060 [75560]: https://github.com/rust-lang/rust/pull/75560/
1061 [75568]: https://github.com/rust-lang/rust/pull/75568/
1062 [75366]: https://github.com/rust-lang/rust/pull/75366/
1063 [75204]: https://github.com/rust-lang/rust/pull/75204/
1064 [74650]: https://github.com/rust-lang/rust/pull/74650/
1065 [74419]: https://github.com/rust-lang/rust/pull/74419/
1066 [73964]: https://github.com/rust-lang/rust/pull/73964/
1067 [74021]: https://github.com/rust-lang/rust/pull/74021/
1068 [74060]: https://github.com/rust-lang/rust/pull/74060/
1069 [73893]: https://github.com/rust-lang/rust/pull/73893/
1070 [73526]: https://github.com/rust-lang/rust/pull/73526/
1071 [73583]: https://github.com/rust-lang/rust/pull/73583/
1072 [73084]: https://github.com/rust-lang/rust/pull/73084/
1073 [73197]: https://github.com/rust-lang/rust/pull/73197/
1074 [72488]: https://github.com/rust-lang/rust/pull/72488/
1075 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1076 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1077 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1078 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1079 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1080 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1081 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1082 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1083 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1084 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1085 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1086 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1087 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1088 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1089 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1092 Version 1.46.0 (2020-08-27)
1093 ==========================
1097 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1098 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1099 const functions.][73862]
1100 - [The `#[track_caller]` attribute can now be added to functions to use the
1101 function's caller's location information for panic messages.][72445]
1102 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1103 `x.0.0` over `(x.0).0`.
1104 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1105 You currently can't use `mem::transmute` in constant functions.
1109 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1110 - [Enabled static "Position Independent Executables" by default
1111 for `x86_64-unknown-linux-musl`.][70740]
1115 - [`mem::forget` is now a `const fn`.][73887]
1116 - [`String` now implements `From<char>`.][73466]
1117 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1118 integer types.][73032]
1119 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1120 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1121 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1122 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1123 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1124 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1129 - [`vec::Drain::as_slice`]
1133 Added a number of new environment variables that are now available when
1134 compiling your crate.
1136 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1137 the specific binary being compiled and the name of the crate.
1138 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1139 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1143 - [The target configuration option `abi_blacklist` has been renamed
1144 to `unsupported_abis`.][74150] The old name will still continue to work.
1145 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1146 This was previously accepted but will become a hard error in a future release.
1147 - [Rustc will fail to compile if you have a struct with
1148 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1150 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1151 ensure that spans have the correct information, and may cause breakage if you
1152 were relying on receiving spans with dummy information.
1153 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1154 a legacy installer that was replaced by a MSI installer a few years ago but
1155 was still being built.
1156 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1157 - [Rustc will no longer accept overlapping trait implementations that only
1158 differ in how the lifetime was bound.][72493]
1159 - [Rustc now correctly relates the lifetime of an existential associated
1160 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1161 you to pass a shorter lifetime than expected.
1162 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1163 The library will need to be installed for `rustc` to work, even though we
1164 expect it to be already available on most systems.
1165 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1167 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1168 exact output returned by rustc's pretty printing is an unstable
1169 implementation detail: we recommend any macro relying on it to switch to a
1170 more robust parsing system.
1172 [75453]: https://github.com/rust-lang/rust/issues/75453/
1173 [74820]: https://github.com/rust-lang/rust/issues/74820/
1174 [74420]: https://github.com/rust-lang/rust/issues/74420/
1175 [74109]: https://github.com/rust-lang/rust/pull/74109/
1176 [74150]: https://github.com/rust-lang/rust/pull/74150/
1177 [73862]: https://github.com/rust-lang/rust/pull/73862/
1178 [73887]: https://github.com/rust-lang/rust/pull/73887/
1179 [73466]: https://github.com/rust-lang/rust/pull/73466/
1180 [73516]: https://github.com/rust-lang/rust/pull/73516/
1181 [73293]: https://github.com/rust-lang/rust/pull/73293/
1182 [73007]: https://github.com/rust-lang/rust/pull/73007/
1183 [73032]: https://github.com/rust-lang/rust/pull/73032/
1184 [72920]: https://github.com/rust-lang/rust/pull/72920/
1185 [72569]: https://github.com/rust-lang/rust/pull/72569/
1186 [72583]: https://github.com/rust-lang/rust/pull/72583/
1187 [72584]: https://github.com/rust-lang/rust/pull/72584/
1188 [72717]: https://github.com/rust-lang/rust/pull/72717/
1189 [72437]: https://github.com/rust-lang/rust/pull/72437/
1190 [72445]: https://github.com/rust-lang/rust/pull/72445/
1191 [72486]: https://github.com/rust-lang/rust/pull/72486/
1192 [72493]: https://github.com/rust-lang/rust/pull/72493/
1193 [72331]: https://github.com/rust-lang/rust/pull/72331/
1194 [71896]: https://github.com/rust-lang/rust/pull/71896/
1195 [71660]: https://github.com/rust-lang/rust/pull/71660/
1196 [71322]: https://github.com/rust-lang/rust/pull/71322/
1197 [70740]: https://github.com/rust-lang/rust/pull/70740/
1198 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1199 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1200 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1201 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1202 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1205 Version 1.45.2 (2020-08-03)
1206 ==========================
1208 * [Fix bindings in tuple struct patterns][74954]
1209 * [Fix track_caller integration with trait objects][74784]
1211 [74954]: https://github.com/rust-lang/rust/issues/74954
1212 [74784]: https://github.com/rust-lang/rust/issues/74784
1215 Version 1.45.1 (2020-07-30)
1216 ==========================
1218 * [Fix const propagation with references.][73613]
1219 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1220 * [Avoid spurious implicit region bound.][74509]
1221 * [Install clippy on x.py install][74457]
1223 [73613]: https://github.com/rust-lang/rust/pull/73613
1224 [73078]: https://github.com/rust-lang/rust/issues/73078
1225 [74509]: https://github.com/rust-lang/rust/pull/74509
1226 [74457]: https://github.com/rust-lang/rust/pull/74457
1229 Version 1.45.0 (2020-07-16)
1230 ==========================
1234 - [Out of range float to int conversions using `as` has been defined as a saturating
1235 conversion.][71269] This was previously undefined behaviour, but you can use the
1236 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1237 may be desirable in rare performance sensitive situations.
1238 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1239 using `u64`.][70705]
1240 - [Function like procedural macros can now be used in expression, pattern, and statement
1241 positions.][68717] This means you can now use a function-like procedural macro
1242 anywhere you can use a declarative (`macro_rules!`) macro.
1246 - [You can now override individual target features through the `target-feature`
1247 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1248 equivalent to `-C target-feature=+avx2,+fma`.
1249 - [Added the `force-unwind-tables` flag.][69984] This option allows
1250 rustc to always generate unwind tables regardless of panic strategy.
1251 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1252 to include LLVM bitcode into generated `rlib`s (this is on by default).
1253 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1254 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1255 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1256 - [Upgraded to LLVM 10.][67759]
1258 \* Refer to Rust's [platform support page][platform-support-doc] for more
1259 information on Rust's tiered platform support.
1264 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1266 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1267 - [You can now use `char` with
1268 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1269 a range of codepoints.][72413] E.g.
1270 you can now write the following;
1272 for ch in 'a'..='z' {
1276 // Prints "abcdefghijklmnopqrstuvwxyz"
1278 - [`OsString` now implements `FromStr`.][71662]
1279 - [The `saturating_neg` method has been added to all signed integer primitive
1280 types, and the `saturating_abs` method has been added for all integer
1281 primitive types.][71886]
1282 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1283 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1285 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1286 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1287 integer types.][69813]
1288 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1289 integer types.][72324]
1290 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1295 - [`BTreeMap::remove_entry`]
1297 - [`rc::Weak::as_ptr`]
1298 - [`rc::Weak::from_raw`]
1299 - [`rc::Weak::into_raw`]
1300 - [`str::strip_prefix`]
1301 - [`str::strip_suffix`]
1302 - [`sync::Weak::as_ptr`]
1303 - [`sync::Weak::from_raw`]
1304 - [`sync::Weak::into_raw`]
1305 - [`char::UNICODE_VERSION`]
1306 - [`Span::resolved_at`]
1307 - [`Span::located_at`]
1308 - [`Span::mixed_site`]
1309 - [`unix::process::CommandExt::arg0`]
1314 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1319 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1320 `~~outdated information~~` becomes "~~outdated information~~".
1321 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1325 - [Trying to self initialize a static value (that is creating a value using
1326 itself) is unsound and now causes a compile error.][71140]
1327 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1328 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1329 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1330 previously undocumented and not intended for public use. Rustdoc still provides
1331 a non-zero exit code on errors.
1332 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1333 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1334 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1335 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1336 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
1340 - [Make clippy a git subtree instead of a git submodule][70655]
1341 - [Unify the undo log of all snapshot types][69464]
1343 [71848]: https://github.com/rust-lang/rust/issues/71848/
1344 [73420]: https://github.com/rust-lang/rust/issues/73420/
1345 [72324]: https://github.com/rust-lang/rust/pull/72324/
1346 [71843]: https://github.com/rust-lang/rust/pull/71843/
1347 [71886]: https://github.com/rust-lang/rust/pull/71886/
1348 [72234]: https://github.com/rust-lang/rust/pull/72234/
1349 [72239]: https://github.com/rust-lang/rust/pull/72239/
1350 [72397]: https://github.com/rust-lang/rust/pull/72397/
1351 [72413]: https://github.com/rust-lang/rust/pull/72413/
1352 [72014]: https://github.com/rust-lang/rust/pull/72014/
1353 [72062]: https://github.com/rust-lang/rust/pull/72062/
1354 [72094]: https://github.com/rust-lang/rust/pull/72094/
1355 [72133]: https://github.com/rust-lang/rust/pull/72133/
1356 [67759]: https://github.com/rust-lang/rust/pull/67759/
1357 [71900]: https://github.com/rust-lang/rust/pull/71900/
1358 [71928]: https://github.com/rust-lang/rust/pull/71928/
1359 [71662]: https://github.com/rust-lang/rust/pull/71662/
1360 [71716]: https://github.com/rust-lang/rust/pull/71716/
1361 [71447]: https://github.com/rust-lang/rust/pull/71447/
1362 [71269]: https://github.com/rust-lang/rust/pull/71269/
1363 [71095]: https://github.com/rust-lang/rust/pull/71095/
1364 [71140]: https://github.com/rust-lang/rust/pull/71140/
1365 [70655]: https://github.com/rust-lang/rust/pull/70655/
1366 [70705]: https://github.com/rust-lang/rust/pull/70705/
1367 [69984]: https://github.com/rust-lang/rust/pull/69984/
1368 [69813]: https://github.com/rust-lang/rust/pull/69813/
1369 [69464]: https://github.com/rust-lang/rust/pull/69464/
1370 [68717]: https://github.com/rust-lang/rust/pull/68717/
1371 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1372 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1373 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1374 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1375 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1376 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1377 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1378 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1379 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1380 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1381 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1382 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1383 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1384 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1385 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1386 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1387 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1390 Version 1.44.1 (2020-06-18)
1391 ===========================
1393 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1394 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1395 * [Fix crashes when finding backtrace on macOS.][71397]
1396 * [Clippy applies lint levels into different files.][clippy/5356]
1398 [71397]: https://github.com/rust-lang/rust/issues/71397
1399 [73078]: https://github.com/rust-lang/rust/issues/73078
1400 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1401 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1404 Version 1.44.0 (2020-06-04)
1405 ==========================
1409 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1410 - [Added the `unused_braces` lint.][70081]
1412 **Syntax-only changes**
1414 - [Expansion-driven outline module parsing][69838]
1419 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1424 These are still rejected semantically, so you will likely receive an error but
1425 these changes can be seen and parsed by macros and conditional compilation.
1429 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1430 Additionally when in incremental mode rustc defaults to 256 codegen units.
1431 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1432 a panic is thrown.][67502]
1433 - [Added tier 3\* support for the `aarch64-unknown-none` and
1434 `aarch64-unknown-none-softfloat` targets.][68334]
1435 - [Added tier 3 support for `arm64-apple-tvos` and
1436 `x86_64-apple-tvos` targets.][68191]
1441 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1442 `vec![]` to be able to be used in `const` contexts.
1443 - [`convert::Infallible` now implements `Hash`.][70281]
1444 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1445 a `&mut OsStr`.][70048]
1446 - [Unicode 13 is now supported.][69929]
1447 - [`String` now implements `From<&mut str>`.][69661]
1448 - [`IoSlice` now implements `Copy`.][69403]
1449 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1450 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1451 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1452 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1453 integer types.][69373]
1457 - [`PathBuf::with_capacity`]
1458 - [`PathBuf::capacity`]
1459 - [`PathBuf::clear`]
1460 - [`PathBuf::reserve`]
1461 - [`PathBuf::reserve_exact`]
1462 - [`PathBuf::shrink_to_fit`]
1463 - [`f32::to_int_unchecked`]
1464 - [`f64::to_int_unchecked`]
1465 - [`Layout::align_to`]
1466 - [`Layout::pad_to_align`]
1468 - [`Layout::extend`]
1472 - [Added the `cargo tree` command which will print a tree graph of
1473 your dependencies.][cargo/8062] E.g.
1475 mdbook v0.3.2 (/Users/src/rust/mdbook)
1477 │ ├── html5ever v0.24.0
1479 │ │ │ └── cfg-if v0.1.9
1481 │ │ └── markup5ever v0.9.0
1482 │ │ ├── log v0.4.8 (*)
1484 │ │ │ └── phf_shared v0.7.24
1485 │ │ │ ├── siphasher v0.2.3
1486 │ │ │ └── unicase v1.4.2
1487 │ │ │ [build-dependencies]
1488 │ │ │ └── version_check v0.1.5
1491 You can also display dependencies on multiple versions of the same crate with
1492 `cargo tree -d` (short for `cargo tree --duplicates`).
1496 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1497 the version in the sidebar.][69494]
1501 - [Rustc now correctly generates static libraries on Windows GNU targets with
1502 the `.a` extension, rather than the previous `.lib`.][70937]
1503 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1504 - [The `file_name` property in JSON output of macro errors now points the actual
1505 source file rather than the previous format of `<NAME macros>`.][70969]
1506 **Note:** this may not point to a file that actually exists on the user's system.
1507 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1508 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1509 not allow zero initialization such as `NonZeroU8`.][66059] This was
1510 previously a warning.
1511 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1512 operator has been defined as a saturating operation.][71269] This was previously
1513 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1514 continue using the current behaviour, which may be desirable in rare performance
1515 sensitive situations.
1519 These changes provide no direct user facing benefits, but represent significant
1520 improvements to the internals and overall performance of rustc and
1523 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1524 - [Replace big JS dict with JSON parsing.][71250]
1526 [69373]: https://github.com/rust-lang/rust/pull/69373/
1527 [66059]: https://github.com/rust-lang/rust/pull/66059/
1528 [68191]: https://github.com/rust-lang/rust/pull/68191/
1529 [68899]: https://github.com/rust-lang/rust/pull/68899/
1530 [71147]: https://github.com/rust-lang/rust/pull/71147/
1531 [71250]: https://github.com/rust-lang/rust/pull/71250/
1532 [70937]: https://github.com/rust-lang/rust/pull/70937/
1533 [70969]: https://github.com/rust-lang/rust/pull/70969/
1534 [70632]: https://github.com/rust-lang/rust/pull/70632/
1535 [70281]: https://github.com/rust-lang/rust/pull/70281/
1536 [70345]: https://github.com/rust-lang/rust/pull/70345/
1537 [70048]: https://github.com/rust-lang/rust/pull/70048/
1538 [70081]: https://github.com/rust-lang/rust/pull/70081/
1539 [70156]: https://github.com/rust-lang/rust/pull/70156/
1540 [71269]: https://github.com/rust-lang/rust/pull/71269/
1541 [69838]: https://github.com/rust-lang/rust/pull/69838/
1542 [69929]: https://github.com/rust-lang/rust/pull/69929/
1543 [69661]: https://github.com/rust-lang/rust/pull/69661/
1544 [69778]: https://github.com/rust-lang/rust/pull/69778/
1545 [69494]: https://github.com/rust-lang/rust/pull/69494/
1546 [69403]: https://github.com/rust-lang/rust/pull/69403/
1547 [69033]: https://github.com/rust-lang/rust/pull/69033/
1548 [68692]: https://github.com/rust-lang/rust/pull/68692/
1549 [68334]: https://github.com/rust-lang/rust/pull/68334/
1550 [67502]: https://github.com/rust-lang/rust/pull/67502/
1551 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1552 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1553 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1554 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1555 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1556 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1557 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1558 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1559 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1560 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1561 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1562 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1563 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1566 Version 1.43.1 (2020-05-07)
1567 ===========================
1569 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1570 * [Fixed the stabilization of AVX-512 features.][71473]
1571 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1573 [71430]: https://github.com/rust-lang/rust/pull/71430
1574 [71473]: https://github.com/rust-lang/rust/issues/71473
1575 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1578 Version 1.43.0 (2020-04-23)
1579 ==========================
1583 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1584 the type inferred correctly.][68129]
1585 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1587 **Syntax only changes**
1588 - [Allow `type Foo: Ord` syntactically.][69361]
1589 - [Fuse associated and extern items up to defaultness.][69194]
1590 - [Syntactically allow `self` in all `fn` contexts.][68764]
1591 - [Merge `fn` syntax + cleanup item parsing.][68728]
1592 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1593 For example, you may now write:
1595 macro_rules! mac_trait {
1605 These are still rejected *semantically*, so you will likely receive an error but
1606 these changes can be seen and parsed by macros and
1607 conditional compilation.
1612 - [You can now pass multiple lint flags to rustc to override the previous
1613 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1614 everything in the `unused` lint group except `unused-variables` which
1615 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1616 everything in the `unused` lint group **including** `unused-variables` since
1617 the allow flag is specified before the deny flag (and therefore overridden).
1618 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1619 if they are available on `windows-gnu`.][67429]
1620 - [rustc now buffers errors/warnings printed in JSON.][69227]
1624 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1625 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1626 respectively.][69538] **Note** These conversions are only available when `N`
1628 - [You can now use associated constants on floats and integers directly, rather
1629 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1630 `f32::NAN` with no imports.
1631 - [`u8::is_ascii` is now `const`.][68984]
1632 - [`String` now implements `AsMut<str>`.][68742]
1633 - [Added the `primitive` module to `std` and `core`.][67637] This module
1634 reexports Rust's primitive types. This is mainly useful in macros
1635 where you want avoid these types being shadowed.
1636 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1637 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1641 - [`Once::is_completed`]
1646 - [`iter::once_with`]
1650 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1651 your environment.][cargo/7823]
1652 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1653 executable path when running integration tests or benchmarks.][cargo/7697]
1654 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1655 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1659 - [Certain checks in the `const_err` lint were deemed unrelated to const
1660 evaluation][69185], and have been moved to the `unconditional_panic` and
1661 `arithmetic_overflow` lints.
1666 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1667 has been a warning since 1.36.0.
1668 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1669 led to some instances being accepted, and now correctly emits a hard error.
1671 [69340]: https://github.com/rust-lang/rust/pull/69340
1675 These changes provide no direct user facing benefits, but represent significant
1676 improvements to the internals and overall performance of `rustc` and
1679 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1680 - [Improved how rustc generates drop code.][67332]
1681 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1682 - [traits: preallocate 2 Vecs of known initial size][69022]
1683 - [Avoid exponential behaviour when relating types][68772]
1684 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1685 - [Improve performance of coherence checks][68966]
1686 - [Deduplicate types in the generator witness][68672]
1687 - [Invert control in struct_lint_level.][68725]
1689 [67332]: https://github.com/rust-lang/rust/pull/67332/
1690 [67429]: https://github.com/rust-lang/rust/pull/67429/
1691 [67637]: https://github.com/rust-lang/rust/pull/67637/
1692 [67642]: https://github.com/rust-lang/rust/pull/67642/
1693 [67878]: https://github.com/rust-lang/rust/pull/67878/
1694 [67885]: https://github.com/rust-lang/rust/pull/67885/
1695 [68129]: https://github.com/rust-lang/rust/pull/68129/
1696 [68672]: https://github.com/rust-lang/rust/pull/68672/
1697 [68725]: https://github.com/rust-lang/rust/pull/68725/
1698 [68728]: https://github.com/rust-lang/rust/pull/68728/
1699 [68738]: https://github.com/rust-lang/rust/pull/68738/
1700 [68742]: https://github.com/rust-lang/rust/pull/68742/
1701 [68764]: https://github.com/rust-lang/rust/pull/68764/
1702 [68772]: https://github.com/rust-lang/rust/pull/68772/
1703 [68943]: https://github.com/rust-lang/rust/pull/68943/
1704 [68952]: https://github.com/rust-lang/rust/pull/68952/
1705 [68966]: https://github.com/rust-lang/rust/pull/68966/
1706 [68984]: https://github.com/rust-lang/rust/pull/68984/
1707 [69022]: https://github.com/rust-lang/rust/pull/69022/
1708 [69185]: https://github.com/rust-lang/rust/pull/69185/
1709 [69194]: https://github.com/rust-lang/rust/pull/69194/
1710 [69201]: https://github.com/rust-lang/rust/pull/69201/
1711 [69227]: https://github.com/rust-lang/rust/pull/69227/
1712 [69548]: https://github.com/rust-lang/rust/pull/69548/
1713 [69256]: https://github.com/rust-lang/rust/pull/69256/
1714 [69361]: https://github.com/rust-lang/rust/pull/69361/
1715 [69366]: https://github.com/rust-lang/rust/pull/69366/
1716 [69538]: https://github.com/rust-lang/rust/pull/69538/
1717 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1718 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1719 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1720 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1721 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1722 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1723 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1724 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1727 Version 1.42.0 (2020-03-12)
1728 ==========================
1732 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1734 fn foo(words: &[&str]) {
1736 ["Hello", "World", "!", ..] => println!("Hello World!"),
1737 ["Foo", "Bar", ..] => println!("Baz"),
1738 rest => println!("{:?}", rest),
1742 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1743 that you can create an enum that has the exact layout and ABI of the type
1745 - [There are some *syntax-only* changes:][67131]
1746 - `default` is syntactically allowed before items in `trait` definitions.
1747 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1748 leave out their bodies in favor of `;`.
1749 - Bounds on associated types in `impl`s are now syntactically allowed
1750 (e.g. `type Foo: Ord;`).
1751 - `...` (the C-variadic type) may occur syntactically directly as the type of
1752 any function parameter.
1754 These are still rejected *semantically*, so you will likely receive an error
1755 but these changes can be seen and parsed by procedural macros and
1756 conditional compilation.
1760 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1761 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1762 - [`Option::{expect,unwrap}` and
1763 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1764 pointing to the location where they were called, rather than
1765 `core`'s internals. ][67887]
1767 \* Refer to Rust's [platform support page][platform-support-doc] for more
1768 information on Rust's tiered platform support.
1772 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1773 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1774 to implement `Sized`.][67935]
1775 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1776 - [`Layout::new` is now `const`.][66254]
1777 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1782 - [`CondVar::wait_while`]
1783 - [`CondVar::wait_timeout_while`]
1785 - [`DebugMap::value`]
1786 - [`ManuallyDrop::take`]
1788 - [`ptr::slice_from_raw_parts_mut`]
1789 - [`ptr::slice_from_raw_parts`]
1793 - [You no longer need to include `extern crate proc_macro;` to be able to
1794 `use proc_macro;` in the `2018` edition.][cargo/7700]
1798 - [`Error::description` has been deprecated, and its use will now produce a
1799 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1801 [68253]: https://github.com/rust-lang/rust/pull/68253/
1802 [68348]: https://github.com/rust-lang/rust/pull/68348/
1803 [67935]: https://github.com/rust-lang/rust/pull/67935/
1804 [68339]: https://github.com/rust-lang/rust/pull/68339/
1805 [68122]: https://github.com/rust-lang/rust/pull/68122/
1806 [67712]: https://github.com/rust-lang/rust/pull/67712/
1807 [67887]: https://github.com/rust-lang/rust/pull/67887/
1808 [67131]: https://github.com/rust-lang/rust/pull/67131/
1809 [67233]: https://github.com/rust-lang/rust/pull/67233/
1810 [66899]: https://github.com/rust-lang/rust/pull/66899/
1811 [66919]: https://github.com/rust-lang/rust/pull/66919/
1812 [66254]: https://github.com/rust-lang/rust/pull/66254/
1813 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1814 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1815 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1816 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1817 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1818 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1819 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1820 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1821 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1824 Version 1.41.1 (2020-02-27)
1825 ===========================
1827 * [Always check types of static items][69145]
1828 * [Always check lifetime bounds of `Copy` impls][69145]
1829 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1831 [69225]: https://github.com/rust-lang/rust/issues/69225
1832 [69145]: https://github.com/rust-lang/rust/pull/69145
1835 Version 1.41.0 (2020-01-30)
1836 ===========================
1841 - [You can now pass type parameters to foreign items when implementing
1842 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1843 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1844 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1845 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1846 - [You can now use any valid identifier in a `format_args` macro.][66847]
1847 Previously identifiers starting with an underscore were not allowed.
1848 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1849 enum variants.][66183] These are still rejected semantically, but
1850 can be seen and parsed by procedural macros and conditional compilation.
1855 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1856 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1857 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1858 - [You can now pass an arguments file passing the `@path` syntax
1859 to rustc.][66172] Note that the format differs somewhat from what is
1860 found in other tooling; please see [the documentation][argfile-docs] for
1862 - [You can now provide `--extern` flag without a path, indicating that it is
1863 available from the search path or specified with an `-L` flag.][64882]
1865 \* Refer to Rust's [platform support page][platform-support-doc] for more
1866 information on Rust's tiered platform support.
1868 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1873 - [The `core::panic` module is now stable.][66771] It was already stable
1875 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1876 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1877 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1882 - [`Result::map_or`]
1883 - [`Result::map_or_else`]
1884 - [`std::rc::Weak::weak_count`]
1885 - [`std::rc::Weak::strong_count`]
1886 - [`std::sync::Weak::weak_count`]
1887 - [`std::sync::Weak::strong_count`]
1892 - [Cargo will now document all the private items for binary crates
1893 by default.][cargo/7593]
1894 - [`cargo-install` will now reinstall the package if it detects that it is out
1895 of date.][cargo/7560]
1896 - [Cargo.lock now uses a more git friendly format that should help to reduce
1897 merge conflicts.][cargo/7579]
1898 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1899 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1900 optimisation level to `2` for debug builds. You can also use
1901 `[profile.<profile>.build-override]` to override build scripts and
1907 - [You can now specify `edition` in documentation code blocks to compile the block
1908 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1909 should be compiled the 2018 edition of Rust.
1910 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1911 current theme with `--check-theme`.][54733]
1912 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1917 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1918 Apple targets.][apple-32bit-drop] This means that the source code is still
1919 available to build, but the targets are no longer being tested and release
1920 binaries for those platforms will no longer be distributed by the Rust project.
1921 Please refer to the linked blog post for more information.
1923 [54733]: https://github.com/rust-lang/rust/pull/54733/
1924 [61351]: https://github.com/rust-lang/rust/pull/61351/
1925 [67255]: https://github.com/rust-lang/rust/pull/67255/
1926 [66661]: https://github.com/rust-lang/rust/pull/66661/
1927 [66771]: https://github.com/rust-lang/rust/pull/66771/
1928 [66847]: https://github.com/rust-lang/rust/pull/66847/
1929 [66238]: https://github.com/rust-lang/rust/pull/66238/
1930 [66277]: https://github.com/rust-lang/rust/pull/66277/
1931 [66325]: https://github.com/rust-lang/rust/pull/66325/
1932 [66172]: https://github.com/rust-lang/rust/pull/66172/
1933 [66183]: https://github.com/rust-lang/rust/pull/66183/
1934 [65879]: https://github.com/rust-lang/rust/pull/65879/
1935 [65013]: https://github.com/rust-lang/rust/pull/65013/
1936 [64882]: https://github.com/rust-lang/rust/pull/64882/
1937 [64325]: https://github.com/rust-lang/rust/pull/64325/
1938 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1939 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1940 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1941 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1942 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1943 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1944 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1945 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1946 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1947 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1948 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1950 Version 1.40.0 (2019-12-19)
1951 ===========================
1955 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1956 `const` contexts.][65188] e.g.
1959 pub struct Point(i32, i32);
1961 const ORIGIN: Point = {
1962 let constructor = Point;
1968 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1969 indicate that there may be variants or fields added in the future.][64639]
1970 For example this requires adding a wild-card branch (`_ => {}`) to any match
1971 statements on a non-exhaustive `enum`. [(RFC 2008)]
1972 - [You can now use function-like procedural macros in `extern` blocks and in
1973 type positions.][63931] e.g. `type Generated = macro!();`
1974 - [Function-like and attribute procedural macros can now emit
1975 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1976 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1977 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1978 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1982 - [Added tier 3 support\* for the
1983 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1984 - [Added tier 3 support for the
1985 `aarch64-unknown-none-softfloat` target.][64589]
1986 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1987 `mips64el-unknown-linux-muslabi64` targets.][65843]
1989 \* Refer to Rust's [platform support page][platform-support-doc] for more
1990 information on Rust's tiered platform support.
1994 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1998 - [`BTreeMap::get_key_value`]
1999 - [`HashMap::get_key_value`]
2000 - [`Option::as_deref_mut`]
2001 - [`Option::as_deref`]
2002 - [`Option::flatten`]
2003 - [`UdpSocket::peer_addr`]
2004 - [`f32::to_be_bytes`]
2005 - [`f32::to_le_bytes`]
2006 - [`f32::to_ne_bytes`]
2007 - [`f64::to_be_bytes`]
2008 - [`f64::to_le_bytes`]
2009 - [`f64::to_ne_bytes`]
2010 - [`f32::from_be_bytes`]
2011 - [`f32::from_le_bytes`]
2012 - [`f32::from_ne_bytes`]
2013 - [`f64::from_be_bytes`]
2014 - [`f64::from_le_bytes`]
2015 - [`f64::from_ne_bytes`]
2022 - [Cargo will now always display warnings, rather than only on
2023 fresh builds.][cargo/7450]
2024 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2025 now produce an error.][cargo/7507] Previously these flags were ignored.
2026 - [You can now publish `dev-dependencies` without including
2027 a `version`.][cargo/7333]
2031 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2032 when running documentation tests with `rustdoc`.][63803]
2036 - [As previously announced, any previous NLL warnings in the 2015 edition are
2037 now hard errors.][64221]
2038 - [The `include!` macro will now warn if it failed to include the
2039 entire file.][64284] The `include!` macro unintentionally only includes the
2040 first _expression_ in a file, and this can be unintuitive. This will become
2041 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2042 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2043 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2044 or `extern` blocks now correctly emits a hard error.
2046 [65294]: https://github.com/rust-lang/rust/pull/65294/
2047 [66103]: https://github.com/rust-lang/rust/pull/66103/
2048 [65843]: https://github.com/rust-lang/rust/pull/65843/
2049 [65188]: https://github.com/rust-lang/rust/pull/65188/
2050 [65092]: https://github.com/rust-lang/rust/pull/65092/
2051 [64589]: https://github.com/rust-lang/rust/pull/64589/
2052 [64639]: https://github.com/rust-lang/rust/pull/64639/
2053 [64221]: https://github.com/rust-lang/rust/pull/64221/
2054 [64284]: https://github.com/rust-lang/rust/pull/64284/
2055 [63931]: https://github.com/rust-lang/rust/pull/63931/
2056 [64035]: https://github.com/rust-lang/rust/pull/64035/
2057 [63674]: https://github.com/rust-lang/rust/pull/63674/
2058 [63803]: https://github.com/rust-lang/rust/pull/63803/
2059 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2060 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2061 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2062 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2063 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2064 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2065 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2066 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2067 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2068 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2069 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2070 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2071 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2072 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2073 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2074 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2075 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2076 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2077 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2078 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2079 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2080 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2081 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2082 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2083 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2084 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2087 Version 1.39.0 (2019-11-07)
2088 ===========================
2092 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2093 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2094 - [You can now use certain attributes on function, closure, and function pointer
2095 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2096 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2097 attributes applied to items. e.g.
2100 #[cfg(windows)] slice: &[u16],
2101 #[cfg(not(windows))] slice: &[u8],
2106 - [You can now take shared references to bind-by-move patterns in the `if` guards
2107 of `match` arms.][63118] e.g.
2110 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2114 // ---- `nums` is bound by move.
2115 if nums.iter().sum::<u8>() == 10
2116 // ^------ `.iter()` implicitly takes a reference to `nums`.
2119 // ----------- Legal as `nums` was bound by move and so we have ownership.
2121 _ => unreachable!(),
2130 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2131 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2132 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2133 **Note** Cargo currently doesn't use this feature. Refer to
2134 [cargo#7315][cargo/7315] to track this feature's progress.
2135 - [You can now pass `--show-output` argument to test binaries to print the
2136 output of successful tests.][62600]
2139 \* Refer to Rust's [platform support page][platform-support-doc] for more
2140 information on Rust's tiered platform support.
2144 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2145 - [`LinkedList::new` is now a `const` function.][63684]
2146 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2147 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2148 now `const`.][63786]
2152 - [`Pin::into_inner`]
2153 - [`Instant::checked_duration_since`]
2154 - [`Instant::saturating_duration_since`]
2158 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2159 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2160 `--all` is now deprecated.
2164 - [You can now pass `-Clinker` to rustdoc to control the linker used
2165 for compiling doctests.][63834]
2169 - [Code that was previously accepted by the old borrow checker, but rejected by
2170 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2171 previously a warning, and will also become a hard error in the Rust 2015
2172 edition in the 1.40.0 release.
2173 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2174 run tests.][63827] This should improve performance when running a large
2176 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2177 recommended to use the `?` operator instead.
2178 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2181 [62600]: https://github.com/rust-lang/rust/pull/62600/
2182 [62672]: https://github.com/rust-lang/rust/pull/62672/
2183 [63118]: https://github.com/rust-lang/rust/pull/63118/
2184 [63209]: https://github.com/rust-lang/rust/pull/63209/
2185 [63402]: https://github.com/rust-lang/rust/pull/63402/
2186 [63565]: https://github.com/rust-lang/rust/pull/63565/
2187 [63595]: https://github.com/rust-lang/rust/pull/63595/
2188 [63684]: https://github.com/rust-lang/rust/pull/63684/
2189 [63698]: https://github.com/rust-lang/rust/pull/63698/
2190 [63770]: https://github.com/rust-lang/rust/pull/63770/
2191 [63786]: https://github.com/rust-lang/rust/pull/63786/
2192 [63827]: https://github.com/rust-lang/rust/pull/63827/
2193 [63834]: https://github.com/rust-lang/rust/pull/63834/
2194 [63927]: https://github.com/rust-lang/rust/pull/63927/
2195 [63933]: https://github.com/rust-lang/rust/pull/63933/
2196 [63934]: https://github.com/rust-lang/rust/pull/63934/
2197 [63938]: https://github.com/rust-lang/rust/pull/63938/
2198 [63940]: https://github.com/rust-lang/rust/pull/63940/
2199 [63941]: https://github.com/rust-lang/rust/pull/63941/
2200 [63945]: https://github.com/rust-lang/rust/pull/63945/
2201 [64010]: https://github.com/rust-lang/rust/pull/64010/
2202 [64028]: https://github.com/rust-lang/rust/pull/64028/
2203 [64334]: https://github.com/rust-lang/rust/pull/64334/
2204 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2205 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2206 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2207 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2208 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2209 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2211 Version 1.38.0 (2019-09-26)
2212 ==========================
2216 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2217 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2221 - [Added pipelined compilation support to `rustc`.][62766] This will
2222 improve compilation times in some cases. For further information please refer
2223 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2224 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2225 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2226 `x86_64-uwp-windows-msvc` targets.][60260]
2227 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2228 `armv7-unknown-linux-musleabi` targets.][63107]
2229 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2230 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2231 - [Upgraded to LLVM 9.][62592]
2233 \* Refer to Rust's [platform support page][platform-support-doc] for more
2234 information on Rust's tiered platform support.
2238 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2239 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2240 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2241 is available at `std::clone::Clone`). This also makes all built-in macros
2242 available in `std`/`core` root. e.g. `std::include_bytes!`.
2243 - [`str::Chars` now implements `Debug`.][63000]
2244 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2245 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2246 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2247 - [Added euclidean remainder and division operations (`div_euclid`,
2248 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2249 `overflowing`, and `wrapping` versions are available for all
2251 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2252 `PartialEq`.][61491]
2253 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2257 - [`<*const T>::cast`]
2258 - [`<*mut T>::cast`]
2259 - [`Duration::as_secs_f32`]
2260 - [`Duration::as_secs_f64`]
2261 - [`Duration::div_f32`]
2262 - [`Duration::div_f64`]
2263 - [`Duration::from_secs_f32`]
2264 - [`Duration::from_secs_f64`]
2265 - [`Duration::mul_f32`]
2266 - [`Duration::mul_f64`]
2267 - [`any::type_name`]
2271 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2272 - [You can now pass the `--features` option multiple times to enable
2273 multiple features.][cargo/7084]
2278 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2282 - [`rustc` will now warn about some incorrect uses of
2283 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2287 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2289 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2290 issues][62896] with certain crates such as libc.
2292 [60260]: https://github.com/rust-lang/rust/pull/60260/
2293 [61457]: https://github.com/rust-lang/rust/pull/61457/
2294 [61491]: https://github.com/rust-lang/rust/pull/61491/
2295 [61884]: https://github.com/rust-lang/rust/pull/61884/
2296 [61953]: https://github.com/rust-lang/rust/pull/61953/
2297 [62042]: https://github.com/rust-lang/rust/pull/62042/
2298 [62528]: https://github.com/rust-lang/rust/pull/62528/
2299 [62583]: https://github.com/rust-lang/rust/pull/62583/
2300 [62735]: https://github.com/rust-lang/rust/pull/62735/
2301 [62766]: https://github.com/rust-lang/rust/pull/62766/
2302 [62784]: https://github.com/rust-lang/rust/pull/62784/
2303 [62592]: https://github.com/rust-lang/rust/pull/62592/
2304 [62785]: https://github.com/rust-lang/rust/issues/62785/
2305 [62814]: https://github.com/rust-lang/rust/pull/62814/
2306 [62896]: https://github.com/rust-lang/rust/issues/62896/
2307 [63000]: https://github.com/rust-lang/rust/pull/63000/
2308 [63056]: https://github.com/rust-lang/rust/pull/63056/
2309 [63107]: https://github.com/rust-lang/rust/pull/63107/
2310 [63346]: https://github.com/rust-lang/rust/pull/63346/
2311 [63421]: https://github.com/rust-lang/rust/pull/63421/
2312 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2313 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2314 [63048]: https://github.com/rust-lang/rust/pull/63048
2315 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2316 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2317 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2318 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2319 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2320 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2321 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2322 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2323 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2324 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2325 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2326 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2327 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2329 Version 1.37.0 (2019-08-15)
2330 ==========================
2334 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2335 [`Box`][62228], or an [array][62235] and unused.
2336 - [You can now use the `cfg` and `cfg_attr` attributes on
2337 generic parameters.][61547]
2338 - [You can now use enum variants through type alias.][61682] e.g. You can
2339 write the following:
2341 type MyOption = Option<u8>;
2343 fn increment_or_zero(x: MyOption) -> u8 {
2345 MyOption::Some(y) => y + 1,
2346 MyOption::None => 0,
2350 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
2351 `const _: u32 = 5;`.
2352 - [You can now use `#[repr(align(X)]` on enums.][61229]
2353 - [The `?` Kleene macro operator is now available in the
2354 2015 edition.][60932]
2358 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2359 and `-C profile-use` flags.][61268] For more information on how to use profile
2360 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2361 - [The `rust-lldb` wrapper script should now work again.][61827]
2365 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2369 - [`BufReader::buffer`]
2370 - [`BufWriter::buffer`]
2371 - [`Cell::from_mut`]
2372 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2373 - [`DoubleEndedIterator::nth_back`]
2375 - [`Wrapping::reverse_bits`]
2376 - [`i128::reverse_bits`]
2377 - [`i16::reverse_bits`]
2378 - [`i32::reverse_bits`]
2379 - [`i64::reverse_bits`]
2380 - [`i8::reverse_bits`]
2381 - [`isize::reverse_bits`]
2382 - [`slice::copy_within`]
2383 - [`u128::reverse_bits`]
2384 - [`u16::reverse_bits`]
2385 - [`u32::reverse_bits`]
2386 - [`u64::reverse_bits`]
2387 - [`u8::reverse_bits`]
2388 - [`usize::reverse_bits`]
2392 - [`Cargo.lock` files are now included by default when publishing executable crates
2393 with executables.][cargo/7026]
2394 - [You can now specify `default-run="foo"` in `[package]` to specify the
2395 default executable to use for `cargo run`.][cargo/7056]
2402 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2403 Please transition your code to using the `..=` syntax for inclusive
2405 - [Using a trait object without the `dyn` will now warn by default.][61203]
2406 Please transition your code to use `dyn Trait` for trait objects instead.
2408 [62228]: https://github.com/rust-lang/rust/pull/62228/
2409 [62235]: https://github.com/rust-lang/rust/pull/62235/
2410 [61802]: https://github.com/rust-lang/rust/pull/61802/
2411 [61827]: https://github.com/rust-lang/rust/pull/61827/
2412 [61547]: https://github.com/rust-lang/rust/pull/61547/
2413 [61682]: https://github.com/rust-lang/rust/pull/61682/
2414 [61268]: https://github.com/rust-lang/rust/pull/61268/
2415 [61342]: https://github.com/rust-lang/rust/pull/61342/
2416 [61347]: https://github.com/rust-lang/rust/pull/61347/
2417 [61100]: https://github.com/rust-lang/rust/pull/61100/
2418 [61203]: https://github.com/rust-lang/rust/pull/61203/
2419 [61229]: https://github.com/rust-lang/rust/pull/61229/
2420 [60932]: https://github.com/rust-lang/rust/pull/60932/
2421 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2422 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2423 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2424 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2425 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2426 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2427 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2428 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2429 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2430 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2431 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2432 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2433 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2434 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2435 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2436 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2437 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2438 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2439 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2440 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2441 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2442 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2443 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2444 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2447 Version 1.36.0 (2019-07-04)
2448 ==========================
2452 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2453 - [The order of traits in trait objects no longer affects the semantics of that
2454 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2455 `dyn fmt::Debug + Send`, where this was previously not the case.
2459 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2460 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2461 - [`mem::needs_drop` is now available as a const fn.][60364]
2462 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2463 - [`String` now implements `BorrowMut<str>`.][60404]
2464 - [`io::Cursor` now implements `Default`.][60234]
2465 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2466 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2467 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2468 environment has access to heap memory allocation.
2469 - [`String` now implements `From<&String>`.][59825]
2470 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2471 return a tuple of each argument when there is multiple arguments.
2472 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2477 - [`VecDeque::rotate_left`]
2478 - [`VecDeque::rotate_right`]
2479 - [`Iterator::copied`]
2481 - [`io::IoSliceMut`]
2482 - [`Read::read_vectored`]
2483 - [`Write::write_vectored`]
2484 - [`str::as_mut_ptr`]
2485 - [`mem::MaybeUninit`]
2486 - [`pointer::align_offset`]
2487 - [`future::Future`]
2489 - [`task::RawWaker`]
2490 - [`task::RawWakerVTable`]
2496 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2497 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2499 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2503 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2510 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2511 longer recommended, and will be deprecated in 1.39.0.
2513 [60318]: https://github.com/rust-lang/rust/pull/60318/
2514 [60364]: https://github.com/rust-lang/rust/pull/60364/
2515 [60370]: https://github.com/rust-lang/rust/pull/60370/
2516 [60404]: https://github.com/rust-lang/rust/pull/60404/
2517 [60234]: https://github.com/rust-lang/rust/pull/60234/
2518 [60244]: https://github.com/rust-lang/rust/pull/60244/
2519 [58623]: https://github.com/rust-lang/rust/pull/58623/
2520 [59648]: https://github.com/rust-lang/rust/pull/59648/
2521 [59675]: https://github.com/rust-lang/rust/pull/59675/
2522 [59825]: https://github.com/rust-lang/rust/pull/59825/
2523 [59826]: https://github.com/rust-lang/rust/pull/59826/
2524 [59445]: https://github.com/rust-lang/rust/pull/59445/
2525 [59114]: https://github.com/rust-lang/rust/pull/59114/
2526 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2527 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2528 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2529 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2530 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2531 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2532 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2533 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2534 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2535 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2536 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2537 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2538 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2539 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2540 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2541 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2542 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2543 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2544 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2545 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2548 Version 1.35.0 (2019-05-23)
2549 ==========================
2553 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2554 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2555 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2557 unsafe fn call_unsafe(func: unsafe fn()) {
2562 unsafe { call_unsafe(|| {}); }
2569 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2570 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2571 - [Added the `wasm32-unknown-wasi` target.][59464]
2576 - [`Thread` will now show its ID in `Debug` output.][59460]
2577 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2578 - [`alloc::System` now implements `Default`.][59451]
2579 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2581 - [`char::{ToLowercase, ToUppercase}` now
2582 implement `ExactSizeIterator`.][58778]
2583 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2584 - [Removed the `Read` trait bounds
2585 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2586 - [You can now call the `dbg!` macro without any parameters to print the file
2587 and line where it is called.][57847]
2588 - [In place ASCII case conversions are now up to 4× faster.][59283]
2589 e.g. `str::make_ascii_lowercase`
2590 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2597 - [`RefCell::replace_with`]
2598 - [`RefCell::map_split`]
2600 - [`Range::contains`]
2601 - [`RangeFrom::contains`]
2602 - [`RangeTo::contains`]
2603 - [`RangeInclusive::contains`]
2604 - [`RangeToInclusive::contains`]
2605 - [`Option::copied`]
2609 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2610 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2615 - [The Rust toolchain is now available natively for musl based distros.][58575]
2617 [59460]: https://github.com/rust-lang/rust/pull/59460/
2618 [59464]: https://github.com/rust-lang/rust/pull/59464/
2619 [59500]: https://github.com/rust-lang/rust/pull/59500/
2620 [59512]: https://github.com/rust-lang/rust/pull/59512/
2621 [59580]: https://github.com/rust-lang/rust/pull/59580/
2622 [59283]: https://github.com/rust-lang/rust/pull/59283/
2623 [59451]: https://github.com/rust-lang/rust/pull/59451/
2624 [59076]: https://github.com/rust-lang/rust/pull/59076/
2625 [58778]: https://github.com/rust-lang/rust/pull/58778/
2626 [58717]: https://github.com/rust-lang/rust/pull/58717/
2627 [58369]: https://github.com/rust-lang/rust/pull/58369/
2628 [58423]: https://github.com/rust-lang/rust/pull/58423/
2629 [58080]: https://github.com/rust-lang/rust/pull/58080/
2630 [57847]: https://github.com/rust-lang/rust/pull/57847/
2631 [58575]: https://github.com/rust-lang/rust/pull/58575
2632 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2633 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2634 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2635 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2636 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2637 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2638 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2639 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2640 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2641 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2642 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2643 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2645 Version 1.34.2 (2019-05-14)
2646 ===========================
2648 * [Destabilize the `Error::type_id` function due to a security
2649 vulnerability][60785] ([CVE-2019-12083])
2651 [60785]: https://github.com/rust-lang/rust/pull/60785
2652 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2654 Version 1.34.1 (2019-04-25)
2655 ===========================
2657 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2658 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2659 * [Fix Clippy panic when checking some macros][clippy/3805]
2661 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2662 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2663 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2665 Version 1.34.0 (2019-04-11)
2666 ==========================
2670 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2671 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2673 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2674 `#[attr{}]` procedural macros.][57367]
2675 - [You can now write `extern crate self as foo;`][57407] to import your
2676 crate's root into the extern prelude.
2681 - [You can now target `riscv64imac-unknown-none-elf` and
2682 `riscv64gc-unknown-none-elf`.][58406]
2683 - [You can now enable linker plugin LTO optimisations with
2684 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2685 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2687 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2692 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2693 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2694 the `Hash` trait to create an iterator.
2695 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2696 methods.][58421] Most notably you no longer require the `Ord` trait to create
2698 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2699 for all numeric types.][58044]
2700 - [Indexing a `str` is now generic over all types that
2701 implement `SliceIndex<str>`.][57604]
2702 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2703 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2704 produce a warning if their returning type is unused.
2705 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2706 `overflowing_pow` are now available for all numeric types.][57873] These are
2707 equivalent to methods such as `wrapping_add` for the `pow` operation.
2715 * [`Error::type_id`]
2716 * [`atomic::AtomicI16`]
2717 * [`atomic::AtomicI32`]
2718 * [`atomic::AtomicI64`]
2719 * [`atomic::AtomicI8`]
2720 * [`atomic::AtomicU16`]
2721 * [`atomic::AtomicU32`]
2722 * [`atomic::AtomicU64`]
2723 * [`atomic::AtomicU8`]
2724 * [`convert::Infallible`]
2725 * [`convert::TryFrom`]
2726 * [`convert::TryInto`]
2728 * [`iter::successors`]
2729 * [`num::NonZeroI128`]
2730 * [`num::NonZeroI16`]
2731 * [`num::NonZeroI32`]
2732 * [`num::NonZeroI64`]
2733 * [`num::NonZeroI8`]
2734 * [`num::NonZeroIsize`]
2735 * [`slice::sort_by_cached_key`]
2736 * [`str::escape_debug`]
2737 * [`str::escape_default`]
2738 * [`str::escape_unicode`]
2739 * [`str::split_ascii_whitespace`]
2742 * [`Instant::checked_add`]
2743 * [`Instant::checked_sub`]
2744 * [`SystemTime::checked_add`]
2745 * [`SystemTime::checked_sub`]
2749 - [You can now use alternative registries to crates.io.][cargo/6654]
2753 - [You can now use the `?` operator in your documentation tests without manually
2754 adding `fn main() -> Result<(), _> {}`.][56470]
2758 - [`Command::before_exec` is being replaced by the unsafe method
2759 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2760 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2761 can now use `const` functions in `static` variables.
2763 [58370]: https://github.com/rust-lang/rust/pull/58370/
2764 [58406]: https://github.com/rust-lang/rust/pull/58406/
2765 [58421]: https://github.com/rust-lang/rust/pull/58421/
2766 [58166]: https://github.com/rust-lang/rust/pull/58166/
2767 [58044]: https://github.com/rust-lang/rust/pull/58044/
2768 [58057]: https://github.com/rust-lang/rust/pull/58057/
2769 [58059]: https://github.com/rust-lang/rust/pull/58059/
2770 [57809]: https://github.com/rust-lang/rust/pull/57809/
2771 [57873]: https://github.com/rust-lang/rust/pull/57873/
2772 [57604]: https://github.com/rust-lang/rust/pull/57604/
2773 [57367]: https://github.com/rust-lang/rust/pull/57367/
2774 [57407]: https://github.com/rust-lang/rust/pull/57407/
2775 [57425]: https://github.com/rust-lang/rust/pull/57425/
2776 [57106]: https://github.com/rust-lang/rust/pull/57106/
2777 [56470]: https://github.com/rust-lang/rust/pull/56470/
2778 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2779 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2780 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2781 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2782 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2783 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2784 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2785 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2786 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2787 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2788 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2789 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2790 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2791 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2792 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2793 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2794 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2795 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2796 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2797 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2798 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2799 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2800 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2801 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2802 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2803 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2804 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2805 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2806 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2807 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2808 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2811 Version 1.33.0 (2019-02-28)
2812 ==========================
2816 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2817 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2818 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2819 E.g. You can have match statement on a `u8` that covers `0..=255` and
2820 you would no longer be required to have a `_ => unreachable!()` case.
2821 - [You can now have multiple patterns in `if let` and `while let`
2822 expressions.][57532] You can do this with the same syntax as a `match`
2832 let state = Creature::Crab("Ferris");
2834 if let Creature::Crab(name) | Creature::Person(name) = state {
2835 println!("This creature's name is: {}", name);
2839 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2840 this feature will by default produce a warning as this behaviour can be
2841 unintuitive. E.g. `if let _ = 5 {}`
2842 - [You can now use `let` bindings, assignments, expression statements,
2843 and irrefutable pattern destructuring in const functions.][57175]
2844 - [You can now call unsafe const functions.][57067] E.g.
2846 const unsafe fn foo() -> i32 { 5 }
2847 const fn bar() -> i32 {
2851 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2852 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2853 - [You can now specify a specific alignment with the `#[repr(packed)]`
2854 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2855 with an alignment of 2 bytes and a size of 6 bytes.
2856 - [You can now import an item from a module as an `_`.][56303] This allows you to
2857 import a trait's impls, and not have the name in the namespace. E.g.
2859 use std::io::Read as _;
2861 // Allowed as there is only one `Read` in the module.
2864 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2868 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2869 command line argument.][56351]
2870 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2871 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2872 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2873 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2874 information on Rust's platform support.
2875 - [Added support for the `thumbv7neon-linux-androideabi` and
2876 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2877 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2881 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2882 functions for all numeric types.][57566]
2883 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2884 are now `const` functions for all numeric types.][57105]
2885 - [The methods `is_positive` and `is_negative` are now `const` functions for
2886 all signed numeric types.][57105]
2887 - [The `get` method for all `NonZero` types is now `const`.][57167]
2888 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2889 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2890 numeric types.][57234]
2891 - [`Ipv4Addr::new` is now a `const` function][57234]
2895 - [`unix::FileExt::read_exact_at`]
2896 - [`unix::FileExt::write_all_at`]
2897 - [`Option::transpose`]
2898 - [`Result::transpose`]
2899 - [`convert::identity`]
2902 - [`marker::PhantomPinned`]
2903 - [`Vec::resize_with`]
2904 - [`VecDeque::resize_with`]
2905 - [`Duration::as_millis`]
2906 - [`Duration::as_micros`]
2907 - [`Duration::as_nanos`]
2912 - [You can now publish crates that require a feature flag to compile with
2913 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2914 - [Cargo should now rebuild a crate if a file was modified during the initial
2919 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2920 are now deprecated in the standard library, and their usage will now produce a warning.
2921 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2923 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2925 - [Libtest no longer creates a new thread for each test when
2926 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2928 [55982]: https://github.com/rust-lang/rust/pull/55982/
2929 [56243]: https://github.com/rust-lang/rust/pull/56243
2930 [56303]: https://github.com/rust-lang/rust/pull/56303/
2931 [56351]: https://github.com/rust-lang/rust/pull/56351/
2932 [56362]: https://github.com/rust-lang/rust/pull/56362
2933 [56642]: https://github.com/rust-lang/rust/pull/56642/
2934 [56769]: https://github.com/rust-lang/rust/pull/56769/
2935 [56805]: https://github.com/rust-lang/rust/pull/56805
2936 [56947]: https://github.com/rust-lang/rust/pull/56947/
2937 [57049]: https://github.com/rust-lang/rust/pull/57049/
2938 [57067]: https://github.com/rust-lang/rust/pull/57067/
2939 [57105]: https://github.com/rust-lang/rust/pull/57105
2940 [57130]: https://github.com/rust-lang/rust/pull/57130/
2941 [57167]: https://github.com/rust-lang/rust/pull/57167/
2942 [57175]: https://github.com/rust-lang/rust/pull/57175/
2943 [57234]: https://github.com/rust-lang/rust/pull/57234/
2944 [57332]: https://github.com/rust-lang/rust/pull/57332/
2945 [57465]: https://github.com/rust-lang/rust/pull/57465/
2946 [57532]: https://github.com/rust-lang/rust/pull/57532/
2947 [57535]: https://github.com/rust-lang/rust/pull/57535/
2948 [57566]: https://github.com/rust-lang/rust/pull/57566/
2949 [57615]: https://github.com/rust-lang/rust/pull/57615/
2950 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2951 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2952 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2953 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2954 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2955 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2956 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2957 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2958 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2959 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2960 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2961 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2962 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2963 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2964 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2965 [platform-support]: https://forge.rust-lang.org/platform-support.html
2967 Version 1.32.0 (2019-01-17)
2968 ==========================
2973 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2974 operator allows you to specify zero or one repetitions similar to the `*` and
2976 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2977 now always resolve to the item (`enum`, `struct`, etc.) available in the
2978 module if present, before resolving to a external crate or an item the prelude.][56759]
2981 enum Color { Red, Green, Blue }
2987 - [You can now match against `PhantomData<T>` types.][55837]
2988 - [You can now match against literals in macros with the `literal`
2989 specifier.][56072] This will match against a literal of any type.
2990 E.g. `1`, `'A'`, `"Hello World"`
2991 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2993 struct Point(i32, i32);
2996 pub fn new(x: i32, y: i32) -> Self {
3000 pub fn is_origin(&self) -> bool {
3008 - [Self can also now be used in type definitions.][56366] E.g.
3012 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3015 Cons(T, Box<Self>) // likewise here
3018 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3019 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3023 - [The default allocator has changed from jemalloc to the default allocator on
3024 your system.][55238] The compiler itself on Linux & macOS will still use
3025 jemalloc, but programs compiled with it will use the system allocator.
3026 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3030 - [`PathBuf` now implements `FromStr`.][55148]
3031 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3032 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3033 easily debug expressions in your rust program. E.g.
3036 let b = dbg!(a * 2) + 1;
3037 // ^-- prints: [src/main.rs:4] a * 2 = 4
3041 The following APIs are now `const` functions and can be used in a
3045 - [`UnsafeCell::get`]
3046 - [`char::is_ascii`]
3048 - [`ManuallyDrop::new`]
3049 - [`ManuallyDrop::into_inner`]
3050 - [`RangeInclusive::start`]
3051 - [`RangeInclusive::end`]
3052 - [`NonNull::as_ptr`]
3055 - [`Duration::as_secs`]
3056 - [`Duration::subsec_millis`]
3057 - [`Duration::subsec_micros`]
3058 - [`Duration::subsec_nanos`]
3060 - [`Ipv4Addr::is_unspecified`]
3062 - [`Ipv6Addr::octets`]
3066 - [`i8::to_be_bytes`]
3067 - [`i8::to_le_bytes`]
3068 - [`i8::to_ne_bytes`]
3069 - [`i8::from_be_bytes`]
3070 - [`i8::from_le_bytes`]
3071 - [`i8::from_ne_bytes`]
3072 - [`i16::to_be_bytes`]
3073 - [`i16::to_le_bytes`]
3074 - [`i16::to_ne_bytes`]
3075 - [`i16::from_be_bytes`]
3076 - [`i16::from_le_bytes`]
3077 - [`i16::from_ne_bytes`]
3078 - [`i32::to_be_bytes`]
3079 - [`i32::to_le_bytes`]
3080 - [`i32::to_ne_bytes`]
3081 - [`i32::from_be_bytes`]
3082 - [`i32::from_le_bytes`]
3083 - [`i32::from_ne_bytes`]
3084 - [`i64::to_be_bytes`]
3085 - [`i64::to_le_bytes`]
3086 - [`i64::to_ne_bytes`]
3087 - [`i64::from_be_bytes`]
3088 - [`i64::from_le_bytes`]
3089 - [`i64::from_ne_bytes`]
3090 - [`i128::to_be_bytes`]
3091 - [`i128::to_le_bytes`]
3092 - [`i128::to_ne_bytes`]
3093 - [`i128::from_be_bytes`]
3094 - [`i128::from_le_bytes`]
3095 - [`i128::from_ne_bytes`]
3096 - [`isize::to_be_bytes`]
3097 - [`isize::to_le_bytes`]
3098 - [`isize::to_ne_bytes`]
3099 - [`isize::from_be_bytes`]
3100 - [`isize::from_le_bytes`]
3101 - [`isize::from_ne_bytes`]
3102 - [`u8::to_be_bytes`]
3103 - [`u8::to_le_bytes`]
3104 - [`u8::to_ne_bytes`]
3105 - [`u8::from_be_bytes`]
3106 - [`u8::from_le_bytes`]
3107 - [`u8::from_ne_bytes`]
3108 - [`u16::to_be_bytes`]
3109 - [`u16::to_le_bytes`]
3110 - [`u16::to_ne_bytes`]
3111 - [`u16::from_be_bytes`]
3112 - [`u16::from_le_bytes`]
3113 - [`u16::from_ne_bytes`]
3114 - [`u32::to_be_bytes`]
3115 - [`u32::to_le_bytes`]
3116 - [`u32::to_ne_bytes`]
3117 - [`u32::from_be_bytes`]
3118 - [`u32::from_le_bytes`]
3119 - [`u32::from_ne_bytes`]
3120 - [`u64::to_be_bytes`]
3121 - [`u64::to_le_bytes`]
3122 - [`u64::to_ne_bytes`]
3123 - [`u64::from_be_bytes`]
3124 - [`u64::from_le_bytes`]
3125 - [`u64::from_ne_bytes`]
3126 - [`u128::to_be_bytes`]
3127 - [`u128::to_le_bytes`]
3128 - [`u128::to_ne_bytes`]
3129 - [`u128::from_be_bytes`]
3130 - [`u128::from_le_bytes`]
3131 - [`u128::from_ne_bytes`]
3132 - [`usize::to_be_bytes`]
3133 - [`usize::to_le_bytes`]
3134 - [`usize::to_ne_bytes`]
3135 - [`usize::from_be_bytes`]
3136 - [`usize::from_le_bytes`]
3137 - [`usize::from_ne_bytes`]
3141 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3142 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3146 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3150 - [The argument types for AVX's
3151 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3152 been changed from `*const` to `*mut` as the previous implementation
3156 [55148]: https://github.com/rust-lang/rust/pull/55148/
3157 [55238]: https://github.com/rust-lang/rust/pull/55238/
3158 [55280]: https://github.com/rust-lang/rust/pull/55280/
3159 [55610]: https://github.com/rust-lang/rust/pull/55610/
3160 [55663]: https://github.com/rust-lang/rust/pull/55663/
3161 [55702]: https://github.com/rust-lang/rust/pull/55702/
3162 [55837]: https://github.com/rust-lang/rust/pull/55837/
3163 [55843]: https://github.com/rust-lang/rust/pull/55843/
3164 [56072]: https://github.com/rust-lang/rust/pull/56072/
3165 [56245]: https://github.com/rust-lang/rust/pull/56245/
3166 [56365]: https://github.com/rust-lang/rust/pull/56365/
3167 [56366]: https://github.com/rust-lang/rust/pull/56366/
3168 [56395]: https://github.com/rust-lang/rust/pull/56395/
3169 [56759]: https://github.com/rust-lang/rust/pull/56759/
3170 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3171 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3172 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3173 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3174 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3175 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3176 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3177 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3178 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3179 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3180 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3181 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3182 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3183 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3184 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3185 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3186 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3187 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3188 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3189 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3190 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3191 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3192 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3193 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3194 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3195 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3196 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3197 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3198 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3199 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3200 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3201 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3202 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3203 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3204 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3205 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3206 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3207 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3208 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3209 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3210 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3211 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3212 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3213 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3214 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3215 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3216 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3217 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3218 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3219 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3220 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3221 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3222 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3223 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3224 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3225 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3226 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3227 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3228 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3229 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3230 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3231 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3232 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3233 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3234 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3235 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3236 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3237 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3238 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3239 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3240 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3241 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3242 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3243 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3244 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3245 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3246 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3247 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3248 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3249 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3250 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3251 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3252 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3253 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3254 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3255 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3256 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3257 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3258 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3259 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3260 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3261 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3262 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3265 Version 1.31.1 (2018-12-20)
3266 ===========================
3268 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3269 - [Fix broken go-to-definition in RLS][rls/1171]
3270 - [Fix infinite loop on hover in RLS][rls/1170]
3272 [56562]: https://github.com/rust-lang/rust/pull/56562
3273 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3274 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3276 Version 1.31.0 (2018-12-06)
3277 ==========================
3281 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3282 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3283 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3284 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3286 - [You can now define and use `const` functions.][54835] These are currently
3287 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3288 [language reference][const-reference] for what exactly is available.
3289 - [You can now use tool lints, which allow you to scope lints from external
3290 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3291 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3292 a crate, not just in exported functions.][54451]
3293 - [You can now use parentheses in pattern matches.][54497]
3297 - [Updated musl to 1.1.20][54430]
3301 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3302 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3303 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3304 into `Option<&mut T>` using the `From` trait.][53218]
3305 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3310 - [`slice::align_to`]
3311 - [`slice::align_to_mut`]
3312 - [`slice::chunks_exact`]
3313 - [`slice::chunks_exact_mut`]
3314 - [`slice::rchunks`]
3315 - [`slice::rchunks_mut`]
3316 - [`slice::rchunks_exact`]
3317 - [`slice::rchunks_exact_mut`]
3318 - [`Option::replace`]
3322 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3323 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3324 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3326 [52813]: https://github.com/rust-lang/rust/pull/52813/
3327 [53218]: https://github.com/rust-lang/rust/pull/53218/
3328 [53555]: https://github.com/rust-lang/rust/issues/53555/
3329 [54057]: https://github.com/rust-lang/rust/pull/54057/
3330 [54240]: https://github.com/rust-lang/rust/pull/54240/
3331 [54430]: https://github.com/rust-lang/rust/pull/54430/
3332 [54451]: https://github.com/rust-lang/rust/pull/54451/
3333 [54497]: https://github.com/rust-lang/rust/pull/54497/
3334 [54778]: https://github.com/rust-lang/rust/pull/54778/
3335 [54835]: https://github.com/rust-lang/rust/pull/54835/
3336 [54870]: https://github.com/rust-lang/rust/pull/54870/
3337 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3338 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3339 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3340 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3341 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3342 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
3343 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3344 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
3345 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
3346 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
3347 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
3348 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
3349 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
3350 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
3352 Version 1.30.1 (2018-11-08)
3353 ===========================
3355 - [Fixed overflow ICE in rustdoc][54199]
3356 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3358 [54199]: https://github.com/rust-lang/rust/pull/54199
3359 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3361 Version 1.30.0 (2018-10-25)
3362 ==========================
3366 - [Procedural macros are now available.][52081] These kinds of macros allow for
3367 more powerful code generation. There is a [new chapter available][proc-macros]
3368 in the Rust Programming Language book that goes further in depth.
3369 - [You can now use keywords as identifiers using the raw identifiers
3370 syntax (`r#`),][53236] e.g. `let r#for = true;`
3371 - [Using anonymous parameters in traits is now deprecated with a warning and
3372 will be a hard error in the 2018 edition.][53272]
3373 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3374 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3375 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3376 Previously, using a external crate in a module without a use statement
3377 required `let json = ::serde_json::from_str(foo);` but can now be written
3378 as `let json = serde_json::from_str(foo);`.
3379 - [You can now apply the `#[used]` attribute to static items to prevent the
3380 compiler from optimising them away, even if they appear to be unused,][51363]
3381 e.g. `#[used] static FOO: u32 = 1;`
3382 - [You can now import and reexport macros from other crates with the `use`
3383 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3384 the root module of the crate. If your macro relies on calling other local
3385 macros, it is recommended to export with the
3386 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3388 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3389 using the `vis` specifier.][53370]
3390 - [Non-macro attributes now allow all forms of literals, not just
3391 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3392 write `#[attr(true)]`.
3393 - [You can now specify a function to handle a panic in the Rust runtime with the
3394 `#[panic_handler]` attribute.][51366]
3398 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3399 - [Added the `aarch64-unknown-netbsd` target][53165]
3400 - [Upgraded to LLVM 8.][53611]
3404 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3408 - [`Ipv4Addr::BROADCAST`]
3409 - [`Ipv4Addr::LOCALHOST`]
3410 - [`Ipv4Addr::UNSPECIFIED`]
3411 - [`Ipv6Addr::LOCALHOST`]
3412 - [`Ipv6Addr::UNSPECIFIED`]
3413 - [`Iterator::find_map`]
3415 The following methods are replacement methods for `trim_left`, `trim_right`,
3416 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3418 - [`str::trim_end_matches`]
3420 - [`str::trim_start_matches`]
3421 - [`str::trim_start`]
3425 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3426 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3427 equivalent to calling `rustdoc --error-format=json`.
3428 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3432 - [`rustdoc` allows you to specify what edition to treat your code as with the
3433 `--edition` option.][54057]
3434 - [`rustdoc` now has the `--color` (specify whether to output color) and
3435 `--error-format` (specify error format, e.g. `json`) options.][53003]
3436 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3437 debug symbols.][53774]
3438 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3439 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3441 [50911]: https://github.com/rust-lang/rust/pull/50911/
3442 [51363]: https://github.com/rust-lang/rust/pull/51363/
3443 [51366]: https://github.com/rust-lang/rust/pull/51366/
3444 [52081]: https://github.com/rust-lang/rust/pull/52081/
3445 [53003]: https://github.com/rust-lang/rust/pull/53003/
3446 [53033]: https://github.com/rust-lang/rust/pull/53033/
3447 [53044]: https://github.com/rust-lang/rust/pull/53044/
3448 [53165]: https://github.com/rust-lang/rust/pull/53165/
3449 [53611]: https://github.com/rust-lang/rust/pull/53611/
3450 [53213]: https://github.com/rust-lang/rust/pull/53213/
3451 [53236]: https://github.com/rust-lang/rust/pull/53236/
3452 [53272]: https://github.com/rust-lang/rust/pull/53272/
3453 [53370]: https://github.com/rust-lang/rust/pull/53370/
3454 [53459]: https://github.com/rust-lang/rust/pull/53459/
3455 [53774]: https://github.com/rust-lang/rust/pull/53774/
3456 [53822]: https://github.com/rust-lang/rust/pull/53822/
3457 [54057]: https://github.com/rust-lang/rust/pull/54057/
3458 [54146]: https://github.com/rust-lang/rust/pull/54146/
3459 [54404]: https://github.com/rust-lang/rust/pull/54404/
3460 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3461 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3462 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3463 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3465 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3466 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3467 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3468 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3469 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3470 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3471 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3472 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3473 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3474 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3477 Version 1.29.2 (2018-10-11)
3478 ===========================
3480 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3481 - The `rls-preview` component on the windows-gnu targets has been restored.
3483 [54639]: https://github.com/rust-lang/rust/pull/54639
3486 Version 1.29.1 (2018-09-25)
3487 ===========================
3492 - The standard library's `str::repeat` function contained an out of bounds write
3493 caused by an integer overflow. This has been fixed by deterministically
3494 panicking when an overflow happens.
3496 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3500 Version 1.29.0 (2018-09-13)
3501 ==========================
3505 - [Bumped minimum LLVM version to 5.0.][51899]
3506 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3507 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3508 - [Upgraded to LLVM 7.][51966]
3512 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3513 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3514 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3515 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3517 - [`Cell<T>` now allows `T` to be unsized.][50494]
3518 - [`SocketAddr` is now stable on Redox.][52656]
3523 - [`Iterator::flatten`]
3528 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3529 `--locked` to disable this behavior.
3530 - [`cargo-install` will now allow you to cross compile an install
3531 using `--target`.][cargo/5614]
3532 - [Added the `cargo-fix` subcommand to automatically move project code from
3533 2015 edition to 2018.][cargo/5723]
3534 - [`cargo doc` can now optionally document private types using the
3535 `--document-private-items` flag.][cargo/5543]
3539 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3540 the specified level to that level.][52354] For example `--cap-lints warn`
3541 will demote `deny` and `forbid` lints to `warn`.
3542 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3543 fails and `101` if there is a panic.][52197]
3544 - [A preview of clippy has been made available through rustup.][51122]
3545 You can install the preview with `rustup component add clippy-preview`.
3549 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3550 Use `str::get_unchecked(begin..end)` instead.
3551 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3552 Consider using the `home_dir` function from
3553 https://crates.io/crates/dirs instead.
3554 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3555 - [`cfg` attributes and `--cfg` command line flags are now more
3556 strictly validated.][53893]
3558 [53893]: https://github.com/rust-lang/rust/pull/53893/
3559 [52861]: https://github.com/rust-lang/rust/pull/52861/
3560 [51966]: https://github.com/rust-lang/rust/pull/51966/
3561 [52656]: https://github.com/rust-lang/rust/pull/52656/
3562 [52239]: https://github.com/rust-lang/rust/pull/52239/
3563 [52330]: https://github.com/rust-lang/rust/pull/52330/
3564 [52354]: https://github.com/rust-lang/rust/pull/52354/
3565 [52402]: https://github.com/rust-lang/rust/pull/52402/
3566 [52103]: https://github.com/rust-lang/rust/pull/52103/
3567 [52197]: https://github.com/rust-lang/rust/pull/52197/
3568 [51807]: https://github.com/rust-lang/rust/pull/51807/
3569 [51899]: https://github.com/rust-lang/rust/pull/51899/
3570 [51912]: https://github.com/rust-lang/rust/pull/51912/
3571 [51511]: https://github.com/rust-lang/rust/pull/51511/
3572 [51619]: https://github.com/rust-lang/rust/pull/51619/
3573 [51656]: https://github.com/rust-lang/rust/pull/51656/
3574 [51178]: https://github.com/rust-lang/rust/pull/51178/
3575 [51122]: https://github.com/rust-lang/rust/pull/51122
3576 [50494]: https://github.com/rust-lang/rust/pull/50494/
3577 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3578 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3579 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3580 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3581 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3582 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3583 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3586 Version 1.28.0 (2018-08-02)
3587 ===========================
3591 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3592 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3593 the inner type across Foreign Function Interface (FFI) boundaries.
3594 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3595 and can now be used as identifiers.][51196]
3596 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3597 stable.][51241] This will allow users to specify a global allocator for
3599 - [Unit test functions marked with the `#[test]` attribute can now return
3600 `Result<(), E: Debug>` in addition to `()`.][51298]
3601 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3602 allows macros to easily target lifetimes.
3606 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3607 prioritise making smaller binary sizes. `z` is the same as `s` with the
3608 exception that it does not vectorise loops, which typically results in an even
3610 - [The short error format is now stable.][49546] Specified with
3611 `--error-format=short` this option will provide a more compressed output of
3612 rust error messages.
3613 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3614 - [Reduced the number of allocations in the macro parser.][50855] This can
3615 improve compile times of macro heavy crates on average by 5%.
3619 - [Implemented `Default` for `&mut str`.][51306]
3620 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3621 - [Implemented `Extend` for `()`.][50234]
3622 - [The `Debug` implementation of `time::Duration` should now be more easily
3623 human readable.][50364] Previously a `Duration` of one second would printed as
3624 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3625 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3626 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3627 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3628 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3629 for `PathBuf`.][50170]
3630 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3631 and `Wrapping<i128>`.][50465]
3632 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3633 possible.][51050] This can provide up to a 40% speed increase.
3634 - [Improved error messages when using `format!`.][50610]
3638 - [`Iterator::step_by`]
3639 - [`Path::ancestors`]
3640 - [`SystemTime::UNIX_EPOCH`]
3641 - [`alloc::GlobalAlloc`]
3643 - [`alloc::LayoutErr`]
3646 - [`alloc::alloc_zeroed`]
3647 - [`alloc::dealloc`]
3648 - [`alloc::realloc`]
3649 - [`alloc::handle_alloc_error`]
3650 - [`btree_map::Entry::or_default`]
3651 - [`fmt::Alignment`]
3652 - [`hash_map::Entry::or_default`]
3653 - [`iter::repeat_with`]
3654 - [`num::NonZeroUsize`]
3655 - [`num::NonZeroU128`]
3656 - [`num::NonZeroU16`]
3657 - [`num::NonZeroU32`]
3658 - [`num::NonZeroU64`]
3659 - [`num::NonZeroU8`]
3660 - [`ops::RangeBounds`]
3661 - [`slice::SliceIndex`]
3662 - [`slice::from_mut`]
3663 - [`slice::from_ref`]
3664 - [`{Any + Send + Sync}::downcast_mut`]
3665 - [`{Any + Send + Sync}::downcast_ref`]
3666 - [`{Any + Send + Sync}::is`]
3670 - [Cargo will now no longer allow you to publish crates with build scripts that
3671 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3672 considered to be immutable.
3676 - [The `suggestion_applicability` field in `rustc`'s json output is now
3677 stable.][50486] This will allow dev tools to check whether a code suggestion
3678 would apply to them.
3682 - [Rust will consider trait objects with duplicated constraints to be the same
3683 type as without the duplicated constraint.][51276] For example the below code will
3684 now fail to compile.
3689 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3692 impl Trait + Send + Send {
3693 fn test(&self) { println!("two"); }
3697 [49546]: https://github.com/rust-lang/rust/pull/49546/
3698 [50143]: https://github.com/rust-lang/rust/pull/50143/
3699 [50170]: https://github.com/rust-lang/rust/pull/50170/
3700 [50234]: https://github.com/rust-lang/rust/pull/50234/
3701 [50265]: https://github.com/rust-lang/rust/pull/50265/
3702 [50364]: https://github.com/rust-lang/rust/pull/50364/
3703 [50385]: https://github.com/rust-lang/rust/pull/50385/
3704 [50465]: https://github.com/rust-lang/rust/pull/50465/
3705 [50486]: https://github.com/rust-lang/rust/pull/50486/
3706 [50554]: https://github.com/rust-lang/rust/pull/50554/
3707 [50610]: https://github.com/rust-lang/rust/pull/50610/
3708 [50855]: https://github.com/rust-lang/rust/pull/50855/
3709 [51050]: https://github.com/rust-lang/rust/pull/51050/
3710 [51196]: https://github.com/rust-lang/rust/pull/51196/
3711 [51200]: https://github.com/rust-lang/rust/pull/51200/
3712 [51241]: https://github.com/rust-lang/rust/pull/51241/
3713 [51276]: https://github.com/rust-lang/rust/pull/51276/
3714 [51298]: https://github.com/rust-lang/rust/pull/51298/
3715 [51306]: https://github.com/rust-lang/rust/pull/51306/
3716 [51562]: https://github.com/rust-lang/rust/pull/51562/
3717 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3718 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3719 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3720 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3721 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3722 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3723 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3724 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3725 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3726 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3727 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3728 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3729 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3730 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3731 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3732 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3733 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3734 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3735 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3736 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3737 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3738 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3739 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3740 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3741 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3742 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3743 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3744 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3745 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3746 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3748 Version 1.27.2 (2018-07-20)
3749 ===========================
3754 - The borrow checker was fixed to avoid potential unsoundness when using
3755 match ergonomics: [#52213][52213].
3757 [52213]: https://github.com/rust-lang/rust/issues/52213
3759 Version 1.27.1 (2018-07-10)
3760 ===========================
3765 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3766 when running, which enabled executing code as some other user on a
3767 given machine. This release fixes that vulnerability; you can read
3768 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3770 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3775 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3776 match ergonomics: [#51415][51415], [#49534][49534].
3778 [51415]: https://github.com/rust-lang/rust/issues/51415
3779 [49534]: https://github.com/rust-lang/rust/issues/49534
3780 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3781 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3783 Version 1.27.0 (2018-06-21)
3784 ==========================
3788 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3789 be used as an identifier.
3790 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3791 bare `Trait` syntax, and should make it clearer when being used in tandem with
3792 `impl Trait` because it is equivalent to the following syntax:
3793 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3794 `Box<Trait> == Box<dyn Trait>`.
3795 - [Attributes on generic parameters such as types and lifetimes are
3796 now stable.][48851] e.g.
3797 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3798 - [The `#[must_use]` attribute can now also be used on functions as well as
3799 types.][48925] It provides a lint that by default warns users when the
3800 value returned by a function has not been used.
3804 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3808 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3809 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3810 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3811 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3812 the `cfg` attribute.
3813 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3814 std are now available in core.][49896]
3815 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3817 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3818 that the operation isn't done in place.
3819 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3820 the `#[must_use]` attribute][49533] to warn about unused potentially
3821 expensive allocations.
3825 - [`DoubleEndedIterator::rfind`]
3826 - [`DoubleEndedIterator::rfold`]
3827 - [`DoubleEndedIterator::try_rfold`]
3828 - [`Duration::from_micros`]
3829 - [`Duration::from_nanos`]
3830 - [`Duration::subsec_micros`]
3831 - [`Duration::subsec_millis`]
3832 - [`HashMap::remove_entry`]
3833 - [`Iterator::try_fold`]
3834 - [`Iterator::try_for_each`]
3836 - [`Option::filter`]
3837 - [`String::replace_range`]
3838 - [`Take::set_limit`]
3839 - [`hint::unreachable_unchecked`]
3840 - [`os::unix::process::parent_id`]
3841 - [`ptr::swap_nonoverlapping`]
3842 - [`slice::rsplit_mut`]
3844 - [`slice::swap_with_slice`]
3848 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3849 `readme`, and `repository` fields.][cargo/5386]
3850 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3851 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3852 a different directory than `target` for placing compilation artifacts.
3853 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3854 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3855 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3856 where cargo would infer a binary, Cargo will produce a warning. You can
3857 disable this feature ahead of time by setting any of the following to false:
3858 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3859 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3860 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3864 - [Added “The Rustc book” into the official documentation.][49707]
3865 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3866 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3870 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3871 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3872 compile, `"".is_empty()` will still compile.
3873 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3874 will only print the inner type.][48553] E.g.
3875 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3876 not `AtomicBool(true)`.
3877 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3878 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3879 alignment should cover all use cases.
3880 - The `.description()` method on the `std::error::Error` trait
3881 [has been soft-deprecated][50163]. It is no longer required to implement it.
3883 [48553]: https://github.com/rust-lang/rust/pull/48553/
3884 [48851]: https://github.com/rust-lang/rust/pull/48851/
3885 [48925]: https://github.com/rust-lang/rust/pull/48925/
3886 [49533]: https://github.com/rust-lang/rust/pull/49533/
3887 [49623]: https://github.com/rust-lang/rust/pull/49623/
3888 [49630]: https://github.com/rust-lang/rust/pull/49630/
3889 [49664]: https://github.com/rust-lang/rust/pull/49664/
3890 [49699]: https://github.com/rust-lang/rust/pull/49699/
3891 [49707]: https://github.com/rust-lang/rust/pull/49707/
3892 [49719]: https://github.com/rust-lang/rust/pull/49719/
3893 [49896]: https://github.com/rust-lang/rust/pull/49896/
3894 [49968]: https://github.com/rust-lang/rust/pull/49968/
3895 [50163]: https://github.com/rust-lang/rust/pull/50163
3896 [50177]: https://github.com/rust-lang/rust/pull/50177/
3897 [50378]: https://github.com/rust-lang/rust/pull/50378/
3898 [50398]: https://github.com/rust-lang/rust/pull/50398/
3899 [50423]: https://github.com/rust-lang/rust/pull/50423/
3900 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3901 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3902 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3903 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3904 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3905 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3906 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3907 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3908 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3909 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3910 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3911 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3912 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3913 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3914 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3915 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3916 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3917 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3918 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3919 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3920 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3921 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3922 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3923 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3924 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3925 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3926 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3927 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3928 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3929 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3932 Version 1.26.2 (2018-06-05)
3933 ==========================
3938 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3940 [51117]: https://github.com/rust-lang/rust/issues/51117
3943 Version 1.26.1 (2018-05-29)
3944 ==========================
3949 - [RLS now works on Windows.][50646]
3950 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3956 - [`fn main() -> impl Trait` no longer works for non-Termination
3958 This reverts an accidental stabilization.
3959 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3960 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3962 [50646]: https://github.com/rust-lang/rust/issues/50646
3963 [50656]: https://github.com/rust-lang/rust/pull/50656
3964 [50812]: https://github.com/rust-lang/rust/pull/50812
3965 [50950]: https://github.com/rust-lang/rust/issues/50950
3966 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3968 Version 1.26.0 (2018-05-10)
3969 ==========================
3973 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3974 implement either or both traits.][49299]
3975 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3976 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3977 lifetime can be elided.][49458]
3978 - [`impl Trait` is now stable allowing you to have abstract types in returns
3979 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3980 `fn open(path: impl AsRef<Path>)`.
3981 - [Pattern matching will now automatically apply dereferences.][49394]
3982 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3983 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3984 - [A lot of operations are now available in a const context.][46882] E.g. You
3985 can now index into constant arrays, reference and dereference into constants,
3986 and use tuple struct constructors.
3987 - [Fixed entry slice patterns are now stable.][48516] E.g.
3989 let points = [1, 2, 3, 4];
3991 [1, 2, 3, 4] => println!("All points were sequential."),
3992 _ => println!("Not all points were sequential."),
3999 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4000 - [Fixed exponential projection complexity on nested types.][48296]
4001 This can provide up to a ~12% reduction in compile times for certain crates.
4002 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4003 to remap path prefixes outputted by the compiler.
4004 - [Added `powerpc-unknown-netbsd` target.][48281]
4008 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4009 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4010 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4011 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4012 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4013 - [`ascii::escape_default` is now available in libcore.][48735]
4014 - [Trailing commas are now supported in std and core macros.][48056]
4015 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4016 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4021 - [`*const T::copy_to_nonoverlapping`]
4022 - [`*const T::copy_to`]
4023 - [`*const T::read_unaligned`]
4024 - [`*const T::read_volatile`]
4025 - [`*const T::read`]
4027 - [`*const T::wrapping_add`]
4028 - [`*const T::wrapping_sub`]
4030 - [`*mut T::copy_to_nonoverlapping`]
4031 - [`*mut T::copy_to`]
4032 - [`*mut T::read_unaligned`]
4033 - [`*mut T::read_volatile`]
4035 - [`*mut T::replace`]
4038 - [`*mut T::wrapping_add`]
4039 - [`*mut T::wrapping_sub`]
4040 - [`*mut T::write_bytes`]
4041 - [`*mut T::write_unaligned`]
4042 - [`*mut T::write_volatile`]
4045 - [`FromUtf8Error::as_bytes`]
4046 - [`LocalKey::try_with`]
4047 - [`Option::cloned`]
4048 - [`btree_map::Entry::and_modify`]
4049 - [`fs::read_to_string`]
4052 - [`hash_map::Entry::and_modify`]
4053 - [`iter::FusedIterator`]
4054 - [`ops::RangeInclusive`]
4055 - [`ops::RangeToInclusive`]
4057 - [`slice::rotate_left`]
4058 - [`slice::rotate_right`]
4059 - [`String::retain`]
4064 - [Cargo will now output path to custom commands when `-v` is
4065 passed with `--list`][cargo/5041]
4066 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4070 - [The second edition of "The Rust Programming Language" book is now recommended
4071 over the first.][48404]
4076 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4077 syntax is now invalid.
4079 use std::ops::Fn as dyn;
4080 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4082 - [The result of dereferences are no longer promoted to `'static`.][47408]
4086 const PAIR: &(i32, i32) = &(0, 1);
4087 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4090 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4091 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4093 - [Removed hoedown from rustdoc.][48274]
4094 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4096 [46882]: https://github.com/rust-lang/rust/pull/46882
4097 [47379]: https://github.com/rust-lang/rust/pull/47379
4098 [47408]: https://github.com/rust-lang/rust/pull/47408
4099 [47813]: https://github.com/rust-lang/rust/pull/47813
4100 [48056]: https://github.com/rust-lang/rust/pull/48056
4101 [48125]: https://github.com/rust-lang/rust/pull/48125
4102 [48166]: https://github.com/rust-lang/rust/pull/48166
4103 [48235]: https://github.com/rust-lang/rust/pull/48235
4104 [48274]: https://github.com/rust-lang/rust/pull/48274
4105 [48281]: https://github.com/rust-lang/rust/pull/48281
4106 [48296]: https://github.com/rust-lang/rust/pull/48296
4107 [48326]: https://github.com/rust-lang/rust/pull/48326
4108 [48359]: https://github.com/rust-lang/rust/pull/48359
4109 [48404]: https://github.com/rust-lang/rust/pull/48404
4110 [48481]: https://github.com/rust-lang/rust/pull/48481
4111 [48516]: https://github.com/rust-lang/rust/pull/48516
4112 [48628]: https://github.com/rust-lang/rust/pull/48628
4113 [48629]: https://github.com/rust-lang/rust/pull/48629
4114 [48657]: https://github.com/rust-lang/rust/pull/48657
4115 [48735]: https://github.com/rust-lang/rust/pull/48735
4116 [48978]: https://github.com/rust-lang/rust/pull/48978
4117 [49101]: https://github.com/rust-lang/rust/pull/49101
4118 [49109]: https://github.com/rust-lang/rust/pull/49109
4119 [49121]: https://github.com/rust-lang/rust/pull/49121
4120 [49162]: https://github.com/rust-lang/rust/pull/49162
4121 [49184]: https://github.com/rust-lang/rust/pull/49184
4122 [49234]: https://github.com/rust-lang/rust/pull/49234
4123 [49255]: https://github.com/rust-lang/rust/pull/49255
4124 [49299]: https://github.com/rust-lang/rust/pull/49299
4125 [49305]: https://github.com/rust-lang/rust/pull/49305
4126 [49394]: https://github.com/rust-lang/rust/pull/49394
4127 [49458]: https://github.com/rust-lang/rust/pull/49458
4128 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4129 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4130 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4131 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4132 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4133 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4134 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4135 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4136 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4137 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4138 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4139 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4140 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4141 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4142 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4143 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4144 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4145 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4146 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4147 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4148 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4149 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4150 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4151 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4152 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4153 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4154 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4155 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4156 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4157 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4158 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4159 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4160 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4161 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4162 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4163 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4164 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4165 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4166 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4167 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4168 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4169 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4172 Version 1.25.0 (2018-03-29)
4173 ==========================
4177 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4178 - [You can now use nested groups of imports.][47948]
4179 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4180 - [You can now have `|` at the start of a match arm.][47947] e.g.
4182 enum Foo { A, B, C }
4188 | Foo::B => println!("AB"),
4189 | Foo::C => println!("C"),
4196 - [Upgraded to LLVM 6.][47828]
4197 - [Added `-C lto=val` option.][47521]
4198 - [Added `i586-unknown-linux-musl` target][47282]
4202 - [Impl Send for `process::Command` on Unix.][47760]
4203 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4204 - [`UnsafeCell::into_inner` is now safe.][47204]
4205 - [Implement libstd for CloudABI.][47268]
4206 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4207 - [Implement `AsRef<Path>` for Component][46985]
4208 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4209 - [Moved `Duration` to libcore.][46666]
4213 - [`Location::column`]
4216 The following functions can now be used in a constant expression.
4217 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4218 - [`Duration::new`][47300]
4219 - [`Duration::from_secs`][47300]
4220 - [`Duration::from_millis`][47300]
4224 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4225 - [`cargo new` now defaults to creating a binary crate, instead of a
4226 library crate.][cargo/5029]
4230 - [Rust by example is now shipped with new releases][46196]
4234 - [Deprecated `net::lookup_host`.][47510]
4235 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4236 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4237 around indexing operations (see [#47349][47349]). This has been fixed (which also
4238 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4239 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4241 [33903]: https://github.com/rust-lang/rust/pull/33903
4242 [47947]: https://github.com/rust-lang/rust/pull/47947
4243 [47948]: https://github.com/rust-lang/rust/pull/47948
4244 [47760]: https://github.com/rust-lang/rust/pull/47760
4245 [47790]: https://github.com/rust-lang/rust/pull/47790
4246 [47828]: https://github.com/rust-lang/rust/pull/47828
4247 [47398]: https://github.com/rust-lang/rust/pull/47398
4248 [47510]: https://github.com/rust-lang/rust/pull/47510
4249 [47521]: https://github.com/rust-lang/rust/pull/47521
4250 [47204]: https://github.com/rust-lang/rust/pull/47204
4251 [47251]: https://github.com/rust-lang/rust/pull/47251
4252 [47268]: https://github.com/rust-lang/rust/pull/47268
4253 [47282]: https://github.com/rust-lang/rust/pull/47282
4254 [47300]: https://github.com/rust-lang/rust/pull/47300
4255 [47349]: https://github.com/rust-lang/rust/pull/47349
4256 [46931]: https://github.com/rust-lang/rust/pull/46931
4257 [46985]: https://github.com/rust-lang/rust/pull/46985
4258 [47006]: https://github.com/rust-lang/rust/pull/47006
4259 [46830]: https://github.com/rust-lang/rust/pull/46830
4260 [46095]: https://github.com/rust-lang/rust/pull/46095
4261 [46666]: https://github.com/rust-lang/rust/pull/46666
4262 [46196]: https://github.com/rust-lang/rust/pull/46196
4263 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4264 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4265 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4266 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4267 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4270 Version 1.24.1 (2018-03-01)
4271 ==========================
4273 - [Do not abort when unwinding through FFI][48251]
4274 - [Emit UTF-16 files for linker arguments on Windows][48318]
4275 - [Make the error index generator work again][48308]
4276 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4278 [48251]: https://github.com/rust-lang/rust/issues/48251
4279 [48308]: https://github.com/rust-lang/rust/issues/48308
4280 [48318]: https://github.com/rust-lang/rust/issues/48318
4281 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4284 Version 1.24.0 (2018-02-15)
4285 ==========================
4289 - [External `sysv64` ffi is now available.][46528]
4290 eg. `extern "sysv64" fn foo () {}`
4294 - [rustc now uses 16 codegen units by default for release builds.][46910]
4295 For the fastest builds, utilize `codegen-units=1`.
4296 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4297 - [Add `aarch64-unknown-openbsd` support][46760]
4301 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4302 improvement in performance in the majority of cases.
4303 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4304 with Windows.][46798]
4305 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4306 - [impl `From<bool>` for `AtomicBool`][46293]
4307 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4308 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4309 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4310 - [float::from_bits now just uses transmute.][46012] This provides
4311 some optimisations from LLVM.
4312 - [Copied `AsciiExt` methods onto `char`][46077]
4313 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4314 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4315 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4316 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4320 - [`RefCell::replace`]
4322 - [`atomic::spin_loop_hint`]
4324 The following functions can now be used in a constant expression.
4325 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4327 - [`AtomicBool::new`][46287]
4328 - [`AtomicUsize::new`][46287]
4329 - [`AtomicIsize::new`][46287]
4330 - [`AtomicPtr::new`][46287]
4331 - [`Cell::new`][46287]
4332 - [`{integer}::min_value`][46287]
4333 - [`{integer}::max_value`][46287]
4334 - [`mem::size_of`][46287]
4335 - [`mem::align_of`][46287]
4336 - [`ptr::null`][46287]
4337 - [`ptr::null_mut`][46287]
4338 - [`RefCell::new`][46287]
4339 - [`UnsafeCell::new`][46287]
4343 - [Added a `workspace.default-members` config that
4344 overrides implied `--all` in virtual workspaces.][cargo/4743]
4345 - [Enable incremental by default on development builds.][cargo/4817] Also added
4346 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4347 per-project or global basis respectively.
4354 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
4355 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
4356 in accordance with IETF RFC 4291 §2.2.
4357 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4358 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4359 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4360 - [Leading zeros in tuple struct members is now an error][47084]
4361 - [`column!()` macro is one-based instead of zero-based][46977]
4362 - [`fmt::Arguments` can no longer be shared across threads][45198]
4363 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4364 - [Cargo sets a different working directory for the compiler][cargo/4788]
4366 [44884]: https://github.com/rust-lang/rust/pull/44884
4367 [45198]: https://github.com/rust-lang/rust/pull/45198
4368 [45506]: https://github.com/rust-lang/rust/pull/45506
4369 [45904]: https://github.com/rust-lang/rust/pull/45904
4370 [45990]: https://github.com/rust-lang/rust/pull/45990
4371 [46012]: https://github.com/rust-lang/rust/pull/46012
4372 [46077]: https://github.com/rust-lang/rust/pull/46077
4373 [46094]: https://github.com/rust-lang/rust/pull/46094
4374 [46284]: https://github.com/rust-lang/rust/pull/46284
4375 [46287]: https://github.com/rust-lang/rust/pull/46287
4376 [46293]: https://github.com/rust-lang/rust/pull/46293
4377 [46528]: https://github.com/rust-lang/rust/pull/46528
4378 [46671]: https://github.com/rust-lang/rust/pull/46671
4379 [46713]: https://github.com/rust-lang/rust/pull/46713
4380 [46735]: https://github.com/rust-lang/rust/pull/46735
4381 [46749]: https://github.com/rust-lang/rust/pull/46749
4382 [46760]: https://github.com/rust-lang/rust/pull/46760
4383 [46798]: https://github.com/rust-lang/rust/pull/46798
4384 [46828]: https://github.com/rust-lang/rust/pull/46828
4385 [46831]: https://github.com/rust-lang/rust/pull/46831
4386 [46833]: https://github.com/rust-lang/rust/pull/46833
4387 [46910]: https://github.com/rust-lang/rust/pull/46910
4388 [46977]: https://github.com/rust-lang/rust/pull/46977
4389 [47018]: https://github.com/rust-lang/rust/pull/47018
4390 [47080]: https://github.com/rust-lang/rust/pull/47080
4391 [47084]: https://github.com/rust-lang/rust/pull/47084
4392 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4393 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4394 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4395 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4396 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4397 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4400 Version 1.23.0 (2018-01-04)
4401 ==========================
4405 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4406 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4407 Which should fix some confusing errors in some operations.
4411 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4412 undefined behavior.][45920]
4413 - [rustc now suggests renaming import if names clash.][45660]
4414 - [Display errors/warnings correctly when there are zero-width or
4415 wide characters.][45711]
4416 - [rustc now avoids unnecessary copies of arguments that are
4417 simple bindings][45380] This should improve memory usage on average by 5-10%.
4418 - [Updated musl used to build musl rustc to 1.1.17][45393]
4422 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4423 - [Implement Hash for raw pointers to unsized types][45483]
4424 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4425 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4426 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4427 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4428 and `<*mut T>::as_mut`][44932]
4429 - [Optimized `Thread::{park, unpark}` implementation][45524]
4430 - [Improved `SliceExt::binary_search` performance.][45333]
4431 - [impl `FromIterator<()>` for `()`][45379]
4432 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4440 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4441 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4442 - [Added unit test checking to `cargo check`][cargo/4592]
4443 - [Cargo now lets you install a specific version
4444 using `cargo install --version`][cargo/4637]
4448 - [Releases now ship with the Cargo book documentation.][45692]
4449 - [rustdoc now prints rendering warnings on every run.][45324]
4453 - [Changes have been made to type equality to make it more correct,
4454 in rare cases this could break some code.][45853] [Tracking issue for
4455 further information][45852]
4456 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4457 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4458 Android 9, the minimum supported version is Android 14.
4459 - [Bumped the minimum LLVM to 3.9][45326]
4461 [44042]: https://github.com/rust-lang/rust/pull/44042
4462 [44932]: https://github.com/rust-lang/rust/pull/44932
4463 [45267]: https://github.com/rust-lang/rust/pull/45267
4464 [45324]: https://github.com/rust-lang/rust/pull/45324
4465 [45326]: https://github.com/rust-lang/rust/pull/45326
4466 [45333]: https://github.com/rust-lang/rust/pull/45333
4467 [45379]: https://github.com/rust-lang/rust/pull/45379
4468 [45380]: https://github.com/rust-lang/rust/pull/45380
4469 [45393]: https://github.com/rust-lang/rust/pull/45393
4470 [45435]: https://github.com/rust-lang/rust/pull/45435
4471 [45483]: https://github.com/rust-lang/rust/pull/45483
4472 [45524]: https://github.com/rust-lang/rust/pull/45524
4473 [45571]: https://github.com/rust-lang/rust/pull/45571
4474 [45580]: https://github.com/rust-lang/rust/pull/45580
4475 [45610]: https://github.com/rust-lang/rust/pull/45610
4476 [45660]: https://github.com/rust-lang/rust/pull/45660
4477 [45692]: https://github.com/rust-lang/rust/pull/45692
4478 [45711]: https://github.com/rust-lang/rust/pull/45711
4479 [45772]: https://github.com/rust-lang/rust/pull/45772
4480 [45852]: https://github.com/rust-lang/rust/issues/45852
4481 [45853]: https://github.com/rust-lang/rust/pull/45853
4482 [45887]: https://github.com/rust-lang/rust/pull/45887
4483 [45920]: https://github.com/rust-lang/rust/pull/45920
4484 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4485 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4486 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4489 Version 1.22.1 (2017-11-22)
4490 ==========================
4492 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4494 [46183]: https://github.com/rust-lang/rust/pull/46183
4496 Version 1.22.0 (2017-11-22)
4497 ==========================
4501 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4502 - [Now accepts underscores in unicode escapes][43716]
4503 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4504 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4508 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4509 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4510 This should decrease compile times for debug builds.
4511 - [strict memory alignment now enabled on ARMv6][45094]
4512 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4516 - [Allow atomic operations up to 32 bits
4517 on `armv5te_unknown_linux_gnueabi`][44978]
4518 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4519 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4520 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4521 - [Properly detect overflow in `Instant += Duration`.][44220]
4522 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4523 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4524 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4531 - [Cargo will now build multi file examples in subdirectories of the `examples`
4532 folder that have a `main.rs` file.][cargo/4496]
4533 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4534 the old format will continue to work and can be updated with `cargo update`.
4535 - [Now supports vendoring git repositories][cargo/3992]
4539 - [`libbacktrace` is now available on Apple platforms.][44251]
4540 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4541 This now lets you specify that a given code example will fail to compile.
4545 - [The minimum Android version that rustc can build for has been bumped
4546 to `4.0` from `2.3`][45656]
4547 - [Allowing `T op= &T` for numeric types has broken some type
4548 inference cases][45480]
4551 [42526]: https://github.com/rust-lang/rust/pull/42526
4552 [43017]: https://github.com/rust-lang/rust/pull/43017
4553 [43716]: https://github.com/rust-lang/rust/pull/43716
4554 [43949]: https://github.com/rust-lang/rust/pull/43949
4555 [44015]: https://github.com/rust-lang/rust/pull/44015
4556 [44220]: https://github.com/rust-lang/rust/pull/44220
4557 [44251]: https://github.com/rust-lang/rust/pull/44251
4558 [44287]: https://github.com/rust-lang/rust/pull/44287
4559 [44303]: https://github.com/rust-lang/rust/pull/44303
4560 [44456]: https://github.com/rust-lang/rust/pull/44456
4561 [44466]: https://github.com/rust-lang/rust/pull/44466
4562 [44895]: https://github.com/rust-lang/rust/pull/44895
4563 [44966]: https://github.com/rust-lang/rust/pull/44966
4564 [44978]: https://github.com/rust-lang/rust/pull/44978
4565 [45041]: https://github.com/rust-lang/rust/pull/45041
4566 [45064]: https://github.com/rust-lang/rust/pull/45064
4567 [45075]: https://github.com/rust-lang/rust/pull/45075
4568 [45094]: https://github.com/rust-lang/rust/pull/45094
4569 [45095]: https://github.com/rust-lang/rust/pull/45095
4570 [45480]: https://github.com/rust-lang/rust/issues/45480
4571 [45656]: https://github.com/rust-lang/rust/pull/45656
4572 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4573 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4574 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4581 Version 1.21.0 (2017-10-12)
4582 ==========================
4586 - [You can now use static references for literals.][43838]
4590 let x: &'static u32 = &0;
4593 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4596 my_macro!(Vec<i32>::new); // Always worked
4597 my_macro!(Vec::<i32>::new); // Now works
4602 - [Upgraded jemalloc to 4.5.0][43911]
4603 - [Enabled unwinding panics on Redox][43917]
4604 - [Now runs LLVM in parallel during translation phase.][43506]
4605 This should reduce peak memory usage.
4609 - [Generate builtin impls for `Clone` for all arrays and tuples that
4610 are `T: Clone`][43690]
4611 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4612 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4613 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4618 [`std::mem::discriminant`]
4622 - [You can now call `cargo install` with multiple package names][cargo/4216]
4623 - [Cargo commands inside a virtual workspace will now implicitly
4624 pass `--all`][cargo/4335]
4625 - [Added a `[patch]` section to `Cargo.toml` to handle
4626 prepublication dependencies][cargo/4123] [RFC 1969]
4627 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4628 like patterns][cargo/4270]
4629 - [Added the `--all-targets` option][cargo/4400]
4630 - [Using required dependencies as a feature is now deprecated and emits
4631 a warning][cargo/4364]
4636 - [Cargo docs are moving][43916]
4637 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4638 - [The rustdoc book is now available][43863]
4639 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4640 - [Added a preview of RLS has been made available through rustup][44204]
4641 Install with `rustup component add rls-preview`
4642 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4643 Previously only showed `std::os::unix`.
4647 - [Changes in method matching against higher-ranked types][43880] This may cause
4648 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4649 - [rustc's JSON error output's byte position start at top of file.][42973]
4650 Was previously relative to the rustc's internal `CodeMap` struct which
4651 required the unstable library `libsyntax` to correctly use.
4652 - [`unused_results` lint no longer ignores booleans][43728]
4654 [42565]: https://github.com/rust-lang/rust/pull/42565
4655 [42973]: https://github.com/rust-lang/rust/pull/42973
4656 [43348]: https://github.com/rust-lang/rust/pull/43348
4657 [43459]: https://github.com/rust-lang/rust/pull/43459
4658 [43506]: https://github.com/rust-lang/rust/pull/43506
4659 [43540]: https://github.com/rust-lang/rust/pull/43540
4660 [43690]: https://github.com/rust-lang/rust/pull/43690
4661 [43728]: https://github.com/rust-lang/rust/pull/43728
4662 [43838]: https://github.com/rust-lang/rust/pull/43838
4663 [43863]: https://github.com/rust-lang/rust/pull/43863
4664 [43880]: https://github.com/rust-lang/rust/pull/43880
4665 [43911]: https://github.com/rust-lang/rust/pull/43911
4666 [43916]: https://github.com/rust-lang/rust/pull/43916
4667 [43917]: https://github.com/rust-lang/rust/pull/43917
4668 [44204]: https://github.com/rust-lang/rust/pull/44204
4669 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4670 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4671 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4672 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4673 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4674 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4675 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4676 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4677 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4679 Version 1.20.0 (2017-08-31)
4680 ===========================
4684 - [Associated constants are now stabilised.][42809]
4685 - [A lot of macro bugs are now fixed.][42913]
4690 - [Struct fields are now properly coerced to the expected field type.][42807]
4691 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4692 `wasm32-experimental-emscripten` target.
4693 - [Changed some of the error messages to be more helpful.][42033]
4694 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4696 - [rustc now reports the total number of errors on compilation failure][43015]
4697 previously this was only the number of errors in the pass that failed.
4698 - [Expansion in rustc has been sped up 29x.][42533]
4699 - [added `msp430-none-elf` target.][43099]
4700 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4702 - [Fixes backtraces on Redox][43228]
4703 - [rustc now identifies different versions of same crate when absolute paths of
4704 different types match in an error message.][42826]
4710 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4711 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4713 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4714 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4715 - [Impl `Clone` for `DefaultHasher`.][42799]
4716 - [Impl `Sync` for `SyncSender`.][42397]
4717 - [Impl `FromStr` for `char`][42271]
4718 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4720 - [allow messages in the `unimplemented!()` macro.][42155]
4721 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4722 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4723 - [Upgrade to Unicode 10.0.0][42999]
4724 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4725 - [Skip the main thread's manual stack guard on Linux][43072]
4726 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4727 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4729 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4734 - [`CStr::into_c_string`]
4735 - [`CString::as_c_str`]
4736 - [`CString::into_boxed_c_str`]
4737 - [`Chain::get_mut`]
4738 - [`Chain::get_ref`]
4739 - [`Chain::into_inner`]
4740 - [`Option::get_or_insert_with`]
4741 - [`Option::get_or_insert`]
4742 - [`OsStr::into_os_string`]
4743 - [`OsString::into_boxed_os_str`]
4746 - [`Utf8Error::error_len`]
4747 - [`char::EscapeDebug`]
4748 - [`char::escape_debug`]
4749 - [`compile_error!`]
4750 - [`f32::from_bits`]
4752 - [`f64::from_bits`]
4754 - [`mem::ManuallyDrop`]
4755 - [`slice::sort_unstable_by_key`]
4756 - [`slice::sort_unstable_by`]
4757 - [`slice::sort_unstable`]
4758 - [`str::from_boxed_utf8_unchecked`]
4759 - [`str::as_bytes_mut`]
4760 - [`str::as_bytes_mut`]
4761 - [`str::from_utf8_mut`]
4762 - [`str::from_utf8_unchecked_mut`]
4764 - [`str::get_unchecked_mut`]
4765 - [`str::get_unchecked`]
4767 - [`str::into_boxed_bytes`]
4772 - [Cargo API token location moved from `~/.cargo/config` to
4773 `~/.cargo/credentials`.][cargo/3978]
4774 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4775 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4776 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4777 - [You can now specify version of a binary when installed through
4778 `cargo install` using `--vers`.][cargo/4229]
4779 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4780 failure.][cargo/4248]
4781 - [Changed the convention around which file is the crate root.][cargo/4259]
4782 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4783 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4788 - [Functions with `'static` in their return types will now not be as usable as
4789 if they were using lifetime parameters instead.][42417]
4790 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4791 takes the sign of NaN into account where previously didn't.][42430]
4793 [42033]: https://github.com/rust-lang/rust/pull/42033
4794 [42155]: https://github.com/rust-lang/rust/pull/42155
4795 [42271]: https://github.com/rust-lang/rust/pull/42271
4796 [42397]: https://github.com/rust-lang/rust/pull/42397
4797 [42417]: https://github.com/rust-lang/rust/pull/42417
4798 [42430]: https://github.com/rust-lang/rust/pull/42430
4799 [42431]: https://github.com/rust-lang/rust/pull/42431
4800 [42533]: https://github.com/rust-lang/rust/pull/42533
4801 [42571]: https://github.com/rust-lang/rust/pull/42571
4802 [42613]: https://github.com/rust-lang/rust/pull/42613
4803 [42799]: https://github.com/rust-lang/rust/pull/42799
4804 [42807]: https://github.com/rust-lang/rust/pull/42807
4805 [42809]: https://github.com/rust-lang/rust/pull/42809
4806 [42822]: https://github.com/rust-lang/rust/pull/42822
4807 [42826]: https://github.com/rust-lang/rust/pull/42826
4808 [42854]: https://github.com/rust-lang/rust/pull/42854
4809 [42913]: https://github.com/rust-lang/rust/pull/42913
4810 [42999]: https://github.com/rust-lang/rust/pull/42999
4811 [43011]: https://github.com/rust-lang/rust/pull/43011
4812 [43015]: https://github.com/rust-lang/rust/pull/43015
4813 [43072]: https://github.com/rust-lang/rust/pull/43072
4814 [43077]: https://github.com/rust-lang/rust/pull/43077
4815 [43097]: https://github.com/rust-lang/rust/pull/43097
4816 [43099]: https://github.com/rust-lang/rust/pull/43099
4817 [43170]: https://github.com/rust-lang/rust/pull/43170
4818 [43178]: https://github.com/rust-lang/rust/pull/43178
4819 [43185]: https://github.com/rust-lang/rust/pull/43185
4820 [43228]: https://github.com/rust-lang/rust/pull/43228
4821 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4822 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4823 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4824 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4825 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4826 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4827 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4828 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4829 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4830 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4831 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4832 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4833 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4834 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4835 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4836 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4837 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4838 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4839 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4840 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4841 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4842 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4843 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4844 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4845 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4846 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4847 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4848 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4849 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4850 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4851 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4852 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4853 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4854 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4855 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4856 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4857 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4858 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4859 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4862 Version 1.19.0 (2017-07-20)
4863 ===========================
4868 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4869 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4870 - [Macro recursion limit increased to 1024 from 64.][41676]
4871 - [Added lint for detecting unused macros.][41907]
4872 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4873 For example: `let x = loop { break 7; };`
4874 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4875 contain `Copy` types and cannot have a `Drop` implementation.
4876 Example: `union Foo { bar: u8, baz: usize }`
4877 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4878 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4883 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4884 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4885 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4886 you should use `--target armv7-linux-androideabi`.
4887 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4888 - [Minor optimisation of string operations.][42037]
4889 - [Compiler error message is now `aborting due to previous error(s)` instead of
4890 `aborting due to N previous errors`][42150] This was previously inaccurate and
4891 would only count certain kinds of errors.
4892 - [The compiler now supports Visual Studio 2017][42225]
4893 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4894 - [Added a lot][42264] of [new error codes][42302]
4895 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4896 libraries with C Run-time Libraries(CRT) to be statically linked.
4897 - [Fixed various ARM codegen bugs][42740]
4902 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4903 `Extend<Cow<'a, str>>`][41449]
4904 - [`Vec` now implements `From<&mut [T]>`][41530]
4905 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4906 - [`SplitWhitespace` now implements `Clone`][41659]
4907 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4909 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4910 macros, but for printing to stderr.
4915 - [`OsString::shrink_to_fit`]
4918 - [`thread::ThreadId`]
4923 - [Build scripts can now add environment variables to the environment
4924 the crate is being compiled in.
4925 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4926 - [Subcommands now replace the current process rather than spawning a new
4927 child process][cargo/3970]
4928 - [Workspace members can now accept glob file patterns][cargo/3979]
4929 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4930 the members in a given workspace.][cargo/3988]
4931 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4932 - [Target directory path is now in the cargo metadata][cargo/4022]
4933 - [Cargo no longer checks out a local working directory for the
4934 crates.io index][cargo/4026] This should provide smaller file size for the
4935 registry, and improve cloning times, especially on Windows machines.
4936 - [Added an `--exclude` option for excluding certain packages when using the
4937 `--all` option][cargo/4031]
4938 - [Cargo will now automatically retry when receiving a 5xx error
4939 from crates.io][cargo/4032]
4940 - [The `--features` option now accepts multiple comma or space
4941 delimited values.][cargo/4084]
4942 - [Added support for custom target specific runners][cargo/3954]
4947 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4949 - [Rust will now release XZ compressed packages][rust-installer/57]
4950 - [rustup will now prefer to download rust packages with
4951 XZ compression][rustup/1100] over GZip packages.
4952 - [Added the ability to escape `#` in rust documentation][41785] By adding
4953 additional `#`'s ie. `##` is now `#`
4958 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4959 - [`-Z` flags are now no longer allowed to be used on the stable
4960 compiler.][41751] This has been a warning for a year previous to this.
4961 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4962 longer works][42844]. Users should migrate to the built-in `check`
4963 command, which has been available since 1.16.
4964 - [Ending a float literal with `._` is now a hard error.
4965 Example: `42._` .][41946]
4966 - [Any use of a private `extern crate` outside of its module is now a
4967 hard error.][36886] This was previously a warning.
4968 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4969 relative while the `::` prefix makes a path absolute, but was ignored and the
4970 path was relative regardless.
4971 - [Floating point constants in match patterns is now a hard error][36890]
4972 This was previously a warning.
4973 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4974 match patterns is now a hard error][36891] This was previously a warning.
4975 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4977 - [From the pound escape, lines consisting of multiple `#`s are
4979 - [It is an error to re-export private enum variants][42460]. This is
4980 known to break a number of crates that depend on an older version of
4982 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4983 to use it to find the linker, and the build will fail where it did
4984 not previously][42607]
4986 [36886]: https://github.com/rust-lang/rust/issues/36886
4987 [36888]: https://github.com/rust-lang/rust/issues/36888
4988 [36890]: https://github.com/rust-lang/rust/issues/36890
4989 [36891]: https://github.com/rust-lang/rust/issues/36891
4990 [36892]: https://github.com/rust-lang/rust/issues/36892
4991 [37406]: https://github.com/rust-lang/rust/issues/37406
4992 [39983]: https://github.com/rust-lang/rust/pull/39983
4993 [41145]: https://github.com/rust-lang/rust/pull/41145
4994 [41192]: https://github.com/rust-lang/rust/pull/41192
4995 [41258]: https://github.com/rust-lang/rust/pull/41258
4996 [41370]: https://github.com/rust-lang/rust/pull/41370
4997 [41449]: https://github.com/rust-lang/rust/pull/41449
4998 [41530]: https://github.com/rust-lang/rust/pull/41530
4999 [41624]: https://github.com/rust-lang/rust/pull/41624
5000 [41656]: https://github.com/rust-lang/rust/pull/41656
5001 [41659]: https://github.com/rust-lang/rust/pull/41659
5002 [41676]: https://github.com/rust-lang/rust/pull/41676
5003 [41751]: https://github.com/rust-lang/rust/pull/41751
5004 [41764]: https://github.com/rust-lang/rust/pull/41764
5005 [41785]: https://github.com/rust-lang/rust/pull/41785
5006 [41873]: https://github.com/rust-lang/rust/pull/41873
5007 [41907]: https://github.com/rust-lang/rust/pull/41907
5008 [41946]: https://github.com/rust-lang/rust/pull/41946
5009 [42016]: https://github.com/rust-lang/rust/pull/42016
5010 [42037]: https://github.com/rust-lang/rust/pull/42037
5011 [42068]: https://github.com/rust-lang/rust/pull/42068
5012 [42150]: https://github.com/rust-lang/rust/pull/42150
5013 [42162]: https://github.com/rust-lang/rust/pull/42162
5014 [42225]: https://github.com/rust-lang/rust/pull/42225
5015 [42264]: https://github.com/rust-lang/rust/pull/42264
5016 [42302]: https://github.com/rust-lang/rust/pull/42302
5017 [42460]: https://github.com/rust-lang/rust/issues/42460
5018 [42607]: https://github.com/rust-lang/rust/issues/42607
5019 [42740]: https://github.com/rust-lang/rust/pull/42740
5020 [42844]: https://github.com/rust-lang/rust/issues/42844
5021 [42948]: https://github.com/rust-lang/rust/pull/42948
5022 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5023 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5024 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5025 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5026 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5027 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5028 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5029 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5030 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5031 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5032 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5033 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5034 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5035 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5036 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5037 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5038 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5039 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5040 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5041 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5042 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5043 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5046 Version 1.18.0 (2017-06-08)
5047 ===========================
5052 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5053 make the item visible to just that module tree. Also accepts the keyword
5054 `crate` to make something public to the whole crate but not users of the
5055 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5056 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5057 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5058 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5059 types like `Write + Send`, trailing `+` are now supported in trait objects,
5060 and better error reporting for trait objects starting with `?Sized`.
5061 - [0e+10 is now a valid floating point literal][40589]
5062 - [Now warns if you bind a lifetime parameter to 'static][40734]
5063 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5064 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5065 representation in some cases.][40377]
5070 - [rustc can now emit mir with `--emit mir`][39891]
5071 - [Improved LLVM IR for trivial functions][40367]
5072 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5073 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5074 opportunities found through profiling
5075 - [Improved backtrace formatting when panicking][38165]
5080 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5081 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5082 iteration or reallocation.
5083 - [Simplified HashMap Bucket interface][40561] provides performance
5084 improvements for iterating and cloning.
5085 - [Specialize Vec::from_elem to use calloc][40409]
5086 - [Fixed Race condition in fs::create_dir_all][39799]
5087 - [No longer caching stdio on Windows][40516]
5088 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5089 2.50%~ faster and in one case now 12.50% faster.
5090 - [Optimized `AtomicBool::fetch_nand`][41143]
5095 - [`Child::try_wait`]
5096 - [`HashMap::retain`]
5097 - [`HashSet::retain`]
5099 - [`TcpStream::peek`]
5100 - [`UdpSocket::peek`]
5101 - [`UdpSocket::peek_from`]
5106 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5107 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5108 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5109 - [Added Android build support][cargo/3885]
5110 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5111 of a certain type, for example `cargo build --bins` will build all
5113 - [Added support for haiku][cargo/3952]
5118 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5119 - [Added rust-windbg script for better debugging on Windows][39983]
5120 - [Rust now uses the official cross compiler for NetBSD][40612]
5121 - [rustdoc now accepts `#` at the start of files][40828]
5122 - [Fixed jemalloc support for musl][41168]
5127 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5128 always placed after the sign if it exists and before the digits. With the `#`
5129 flag the zeroes are placed after the prefix and before the digits.
5130 - [Due to the struct field optimisation][40377], using `transmute` on structs
5131 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5132 always been undefined behavior, but is now more likely to break in practice.
5133 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5134 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5135 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5136 - [Overlapping inherent `impl`s are now a hard error][40728]
5137 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5138 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5139 `out.asm` and `out.ll` instead of only one of the filetypes.
5140 - [ calling a function that returns `Self` will no longer work][41805] when
5141 the size of `Self` cannot be statically determined.
5142 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5143 this has caused a few regressions namely:
5145 - Changed the link order of local static/dynamic libraries (respecting the
5146 order on given rather than having the compiler reorder).
5147 - Changed how MinGW is linked, native code linked to dynamic libraries
5148 may require manually linking to the gcc support library (for the native
5151 [38165]: https://github.com/rust-lang/rust/pull/38165
5152 [39799]: https://github.com/rust-lang/rust/pull/39799
5153 [39891]: https://github.com/rust-lang/rust/pull/39891
5154 [39983]: https://github.com/rust-lang/rust/pull/39983
5155 [40043]: https://github.com/rust-lang/rust/pull/40043
5156 [40241]: https://github.com/rust-lang/rust/pull/40241
5157 [40338]: https://github.com/rust-lang/rust/pull/40338
5158 [40367]: https://github.com/rust-lang/rust/pull/40367
5159 [40377]: https://github.com/rust-lang/rust/pull/40377
5160 [40409]: https://github.com/rust-lang/rust/pull/40409
5161 [40516]: https://github.com/rust-lang/rust/pull/40516
5162 [40556]: https://github.com/rust-lang/rust/pull/40556
5163 [40561]: https://github.com/rust-lang/rust/pull/40561
5164 [40589]: https://github.com/rust-lang/rust/pull/40589
5165 [40612]: https://github.com/rust-lang/rust/pull/40612
5166 [40723]: https://github.com/rust-lang/rust/pull/40723
5167 [40728]: https://github.com/rust-lang/rust/pull/40728
5168 [40731]: https://github.com/rust-lang/rust/pull/40731
5169 [40734]: https://github.com/rust-lang/rust/pull/40734
5170 [40805]: https://github.com/rust-lang/rust/pull/40805
5171 [40807]: https://github.com/rust-lang/rust/pull/40807
5172 [40828]: https://github.com/rust-lang/rust/pull/40828
5173 [40870]: https://github.com/rust-lang/rust/pull/40870
5174 [41085]: https://github.com/rust-lang/rust/pull/41085
5175 [41143]: https://github.com/rust-lang/rust/pull/41143
5176 [41168]: https://github.com/rust-lang/rust/pull/41168
5177 [41270]: https://github.com/rust-lang/rust/issues/41270
5178 [41469]: https://github.com/rust-lang/rust/pull/41469
5179 [41805]: https://github.com/rust-lang/rust/issues/41805
5180 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5181 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5182 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5183 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5184 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5185 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5186 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5187 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5188 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5189 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5190 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5191 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5192 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5193 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5196 Version 1.17.0 (2017-04-27)
5197 ===========================
5202 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5203 * [Fields of structs may be initialized without duplicating the field/variable
5204 names][39761]. [RFC 1682]
5205 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5206 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5207 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5208 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5209 `'b`. Soundness fix.
5210 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5211 * [Static variables may contain references to other statics][40027]
5216 * [Exit quickly on only `--emit dep-info`][40336]
5217 * [Make `-C relocation-model` more correctly determine whether the linker
5218 creates a position-independent executable][40245]
5219 * [Add `-C overflow-checks` to directly control whether integer overflow
5221 * [The rustc type checker now checks items on demand instead of in a single
5222 in-order pass][40008]. This is mostly an internal refactoring in support of
5223 future work, including incremental type checking, but also resolves [RFC
5224 1647], allowing `Self` to appear in `impl` `where` clauses.
5225 * [Optimize vtable loads][39995]
5226 * [Turn off vectorization for Emscripten targets][39990]
5227 * [Provide suggestions for unknown macros imported with `use`][39953]
5228 * [Fix ICEs in path resolution][39939]
5229 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5230 * [Add clearer error message using `&str + &str`][39116]
5241 * [`Ordering::then`]
5242 * [`Ordering::then_with`]
5243 * [`BTreeMap::range`]
5244 * [`BTreeMap::range_mut`]
5245 * [`collections::Bound`]
5246 * [`process::abort`]
5247 * [`ptr::read_unaligned`]
5248 * [`ptr::write_unaligned`]
5249 * [`Result::expect_err`]
5252 * [`Cell::into_inner`]
5258 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5259 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5260 * [`String` implements `FromIterator<&char>`][40028]
5261 * `Box` [implements][40009] a number of new conversions:
5262 `From<Box<str>> for String`,
5263 `From<Box<[T]>> for Vec<T>`,
5264 `From<Box<CStr>> for CString`,
5265 `From<Box<OsStr>> for OsString`,
5266 `From<Box<Path>> for PathBuf`,
5267 `Into<Box<str>> for String`,
5268 `Into<Box<[T]>> for Vec<T>`,
5269 `Into<Box<CStr>> for CString`,
5270 `Into<Box<OsStr>> for OsString`,
5271 `Into<Box<Path>> for PathBuf`,
5272 `Default for Box<str>`,
5273 `Default for Box<CStr>`,
5274 `Default for Box<OsStr>`,
5275 `From<&CStr> for Box<CStr>`,
5276 `From<&OsStr> for Box<OsStr>`,
5277 `From<&Path> for Box<Path>`
5278 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5279 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5280 * [Slightly optimize `slice::sort`][39538]
5281 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5282 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5283 `Box<str>` implements `From<&str>`][39438]
5284 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5285 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5286 * [`format!` estimates the needed capacity before writing a string][39356]
5287 * [Support unprivileged symlink creation in Windows][38921]
5288 * [`PathBuf` implements `Default`][38764]
5289 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5290 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5291 and poor hash functions.
5296 * [Add `cargo check --all`][cargo/3731]
5297 * [Add an option to ignore SSL revocation checking][cargo/3699]
5298 * [Add `cargo run --package`][cargo/3691]
5299 * [Add `required_features`][cargo/3667]
5300 * [Assume `build.rs` is a build script][cargo/3664]
5301 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5306 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5308 * [The "Unstable Book" documents nightly-only features][ubook]
5309 * [Improve the style of the sidebar in rustdoc output][40265]
5310 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5311 * [Fix MSP430 breakage due to `i128`][40257]
5312 * [Preliminary Solaris/SPARCv9 support][39903]
5313 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5314 run without installing the MSVC runtime.
5315 * [`rustdoc --test` includes file names in test names][39788]
5316 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5317 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5318 * [Initial support for `aarch64-unknown-freebsd`][39491]
5319 * [Initial support for `i686-unknown-netbsd`][39426]
5320 * [This release no longer includes the old makefile build system][39431]. Rust
5321 is built with a custom build system, written in Rust, and with Cargo.
5322 * [Add Debug implementations for libcollection structs][39002]
5323 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5324 * [`--test-threads=0` produces an error][38945]
5325 * [`rustup` installs documentation by default][40526]
5326 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5327 WinDbg and Visual Studio to improve the debugging experience.
5332 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5333 workaround, either use MSVC 2015 or run vcvars.bat.
5334 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5335 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5336 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5338 * [`format!` and `Display::to_string` panic if an underlying formatting
5339 implementation returns an error][40117]. Previously the error was silently
5340 ignored. It is incorrect for `write_fmt` to return an error when writing
5342 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5343 crates were marked stable and could be accessed from the stable toolchain.
5344 * [Rust git source no longer includes vendored crates][39728]. Those that need
5345 to build with vendored crates should build from release tarballs.
5346 * [Fix inert attributes from `proc_macro_derives`][39572]
5347 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5348 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5350 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5351 existing code generally ignores the type of dead-code unless a type-hint is
5352 provided; this can cause surprising inference interactions particularly around
5353 defaulting. The new code uniformly ignores the result type of dead-code.
5354 * [Tuple-struct constructors with private fields are no longer visible][38932]
5355 * [Lifetime parameters that do not appear in the arguments are now considered
5356 early-bound][38897], resolving a soundness bug (#[32330]). The
5357 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5359 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5360 * [Make transmuting from fn item types to pointer-sized types a hard
5363 [27787]: https://github.com/rust-lang/rust/issues/27787
5364 [32330]: https://github.com/rust-lang/rust/issues/32330
5365 [34198]: https://github.com/rust-lang/rust/pull/34198
5366 [38161]: https://github.com/rust-lang/rust/pull/38161
5367 [38368]: https://github.com/rust-lang/rust/pull/38368
5368 [38584]: https://github.com/rust-lang/rust/issues/38584
5369 [38661]: https://github.com/rust-lang/rust/pull/38661
5370 [38764]: https://github.com/rust-lang/rust/pull/38764
5371 [38864]: https://github.com/rust-lang/rust/issues/38864
5372 [38897]: https://github.com/rust-lang/rust/pull/38897
5373 [38921]: https://github.com/rust-lang/rust/pull/38921
5374 [38932]: https://github.com/rust-lang/rust/pull/38932
5375 [38945]: https://github.com/rust-lang/rust/pull/38945
5376 [38981]: https://github.com/rust-lang/rust/pull/38981
5377 [39002]: https://github.com/rust-lang/rust/pull/39002
5378 [39116]: https://github.com/rust-lang/rust/pull/39116
5379 [39193]: https://github.com/rust-lang/rust/pull/39193
5380 [39265]: https://github.com/rust-lang/rust/pull/39265
5381 [39356]: https://github.com/rust-lang/rust/pull/39356
5382 [39372]: https://github.com/rust-lang/rust/pull/39372
5383 [39426]: https://github.com/rust-lang/rust/pull/39426
5384 [39431]: https://github.com/rust-lang/rust/pull/39431
5385 [39438]: https://github.com/rust-lang/rust/pull/39438
5386 [39440]: https://github.com/rust-lang/rust/pull/39440
5387 [39485]: https://github.com/rust-lang/rust/pull/39485
5388 [39491]: https://github.com/rust-lang/rust/pull/39491
5389 [39518]: https://github.com/rust-lang/rust/pull/39518
5390 [39538]: https://github.com/rust-lang/rust/pull/39538
5391 [39572]: https://github.com/rust-lang/rust/pull/39572
5392 [39633]: https://github.com/rust-lang/rust/pull/39633
5393 [39642]: https://github.com/rust-lang/rust/pull/39642
5394 [39728]: https://github.com/rust-lang/rust/pull/39728
5395 [39761]: https://github.com/rust-lang/rust/pull/39761
5396 [39788]: https://github.com/rust-lang/rust/pull/39788
5397 [39793]: https://github.com/rust-lang/rust/pull/39793
5398 [39837]: https://github.com/rust-lang/rust/pull/39837
5399 [39843]: https://github.com/rust-lang/rust/pull/39843
5400 [39851]: https://github.com/rust-lang/rust/pull/39851
5401 [39903]: https://github.com/rust-lang/rust/pull/39903
5402 [39939]: https://github.com/rust-lang/rust/pull/39939
5403 [39953]: https://github.com/rust-lang/rust/pull/39953
5404 [39960]: https://github.com/rust-lang/rust/pull/39960
5405 [39990]: https://github.com/rust-lang/rust/pull/39990
5406 [39995]: https://github.com/rust-lang/rust/pull/39995
5407 [40008]: https://github.com/rust-lang/rust/pull/40008
5408 [40009]: https://github.com/rust-lang/rust/pull/40009
5409 [40027]: https://github.com/rust-lang/rust/pull/40027
5410 [40028]: https://github.com/rust-lang/rust/pull/40028
5411 [40037]: https://github.com/rust-lang/rust/pull/40037
5412 [40117]: https://github.com/rust-lang/rust/pull/40117
5413 [40166]: https://github.com/rust-lang/rust/pull/40166
5414 [40245]: https://github.com/rust-lang/rust/pull/40245
5415 [40257]: https://github.com/rust-lang/rust/pull/40257
5416 [40261]: https://github.com/rust-lang/rust/pull/40261
5417 [40265]: https://github.com/rust-lang/rust/pull/40265
5418 [40319]: https://github.com/rust-lang/rust/pull/40319
5419 [40336]: https://github.com/rust-lang/rust/pull/40336
5420 [40526]: https://github.com/rust-lang/rust/pull/40526
5421 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5422 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5423 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5424 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5425 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5426 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5427 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5428 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5429 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5430 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5431 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5432 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5433 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5434 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5435 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5436 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5437 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5438 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5439 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5440 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5441 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5442 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5443 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5444 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5445 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5446 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5447 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5448 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5449 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5450 [mdbook]: https://crates.io/crates/mdbook
5451 [ubook]: https://doc.rust-lang.org/unstable-book/
5454 Version 1.16.0 (2017-03-16)
5455 ===========================
5460 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5461 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5462 match patterns][38069]
5463 * [Clean up semantics of `self` in an import list][38313]
5464 * [`Self` may appear in `impl` headers][38920]
5465 * [`Self` may appear in struct expressions][39282]
5470 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5471 a `.rmeta` file containing only crate metadata][38571]. This can be
5472 used by tools like the Rust Language Service to perform
5473 metadata-only builds.
5474 * [Levenshtein based typo suggestions now work in most places, while
5475 previously they worked only for fields and sometimes for local
5476 variables][38927]. Together with the overhaul of "no
5477 resolution"/"unexpected resolution" errors (#[38154]) they result in
5478 large and systematic improvement in resolution diagnostics.
5479 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5481 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5482 * [`rustc` no longer attempts to provide "consider using an explicit
5483 lifetime" suggestions][37057]. They were inaccurate.
5488 * [`VecDeque::truncate`]
5489 * [`VecDeque::resize`]
5490 * [`String::insert_str`]
5491 * [`Duration::checked_add`]
5492 * [`Duration::checked_sub`]
5493 * [`Duration::checked_div`]
5494 * [`Duration::checked_mul`]
5497 * [`SocketAddr::is_ipv4`]
5498 * [`SocketAddr::is_ipv6`]
5499 * [`IpAddr::is_ipv4`]
5500 * [`IpAddr::is_ipv6`]
5502 * [`Vec::dedup_by_key`]
5503 * [`Result::unwrap_or_default`]
5504 * [`<*const T>::wrapping_offset`]
5505 * [`<*mut T>::wrapping_offset`]
5506 * `CommandExt::creation_flags`
5507 * [`File::set_permissions`]
5508 * [`String::split_off`]
5513 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5514 their argument by `Borrow` parameter][37761]
5515 * [All public types in std implement `Debug`][38006]
5516 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5517 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5518 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5520 * [std: Fix partial writes in `LineWriter`][38062]
5521 * [std: Clamp max read/write sizes on Unix][38062]
5522 * [Use more specific panic message for `&str` slicing errors][38066]
5523 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5524 functionality cannot be achieved in std currently.
5525 * [`writeln!`, like `println!`, now accepts a form with no string
5526 or formatting arguments, to just print a newline][38469]
5527 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5528 * [Reduce the size of static data in `std_unicode::tables`][38781]
5529 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5530 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5532 * [`Duration` implements `Sum`][38712]
5533 * [`String` implements `ToSocketAddrs`][39048]
5538 * [The `cargo check` command does a type check of a project without
5539 building it][cargo/3296]
5540 * [crates.io will display CI badges from Travis and AppVeyor, if
5541 specified in Cargo.toml][cargo/3546]
5542 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5543 * [Compilation profiles accept integer values for `debug`, in addition
5544 to `true` and `false`. These are passed to `rustc` as the value to
5545 `-C debuginfo`][cargo/3534]
5546 * [Implement `cargo --version --verbose`][cargo/3604]
5547 * [All builds now output 'dep-info' build dependencies compatible with
5548 make and ninja][cargo/3557]
5549 * [Build all workspace members with `build --all`][cargo/3511]
5550 * [Document all workspace members with `doc --all`][cargo/3515]
5551 * [Path deps outside workspace are not members][cargo/3443]
5556 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5557 the path to the Rust implementation][38589]
5558 * [The `armv7-linux-androideabi` target no longer enables NEON
5559 extensions, per Google's ABI guide][38413]
5560 * [The stock standard library can be compiled for Redox OS][38401]
5561 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5563 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5565 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5570 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5571 match patterns][38069]
5572 * In this release, references to uninhabited types can not be
5573 pattern-matched. This was accidentally allowed in 1.15.
5574 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5575 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5577 * [Clean up semantics of `self` in an import list][38313]
5578 * Reimplemented lifetime elision. This change was almost entirely compatible
5579 with existing code, but it did close a number of small bugs and loopholes,
5580 as well as being more accepting in some other [cases][41105].
5582 [37057]: https://github.com/rust-lang/rust/pull/37057
5583 [37761]: https://github.com/rust-lang/rust/pull/37761
5584 [38006]: https://github.com/rust-lang/rust/pull/38006
5585 [38051]: https://github.com/rust-lang/rust/pull/38051
5586 [38062]: https://github.com/rust-lang/rust/pull/38062
5587 [38062]: https://github.com/rust-lang/rust/pull/38622
5588 [38066]: https://github.com/rust-lang/rust/pull/38066
5589 [38069]: https://github.com/rust-lang/rust/pull/38069
5590 [38131]: https://github.com/rust-lang/rust/pull/38131
5591 [38154]: https://github.com/rust-lang/rust/pull/38154
5592 [38274]: https://github.com/rust-lang/rust/pull/38274
5593 [38304]: https://github.com/rust-lang/rust/pull/38304
5594 [38313]: https://github.com/rust-lang/rust/pull/38313
5595 [38314]: https://github.com/rust-lang/rust/pull/38314
5596 [38327]: https://github.com/rust-lang/rust/pull/38327
5597 [38401]: https://github.com/rust-lang/rust/pull/38401
5598 [38413]: https://github.com/rust-lang/rust/pull/38413
5599 [38469]: https://github.com/rust-lang/rust/pull/38469
5600 [38559]: https://github.com/rust-lang/rust/pull/38559
5601 [38571]: https://github.com/rust-lang/rust/pull/38571
5602 [38580]: https://github.com/rust-lang/rust/pull/38580
5603 [38589]: https://github.com/rust-lang/rust/pull/38589
5604 [38670]: https://github.com/rust-lang/rust/pull/38670
5605 [38712]: https://github.com/rust-lang/rust/pull/38712
5606 [38726]: https://github.com/rust-lang/rust/pull/38726
5607 [38781]: https://github.com/rust-lang/rust/pull/38781
5608 [38798]: https://github.com/rust-lang/rust/pull/38798
5609 [38909]: https://github.com/rust-lang/rust/pull/38909
5610 [38920]: https://github.com/rust-lang/rust/pull/38920
5611 [38927]: https://github.com/rust-lang/rust/pull/38927
5612 [39048]: https://github.com/rust-lang/rust/pull/39048
5613 [39282]: https://github.com/rust-lang/rust/pull/39282
5614 [39379]: https://github.com/rust-lang/rust/pull/39379
5615 [41105]: https://github.com/rust-lang/rust/issues/41105
5616 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5617 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5618 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5619 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5620 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5621 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5622 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5623 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5624 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5625 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5626 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5627 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5628 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5629 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5630 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5631 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5632 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5633 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5634 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5635 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5636 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5637 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5638 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5639 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5640 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5641 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5642 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5643 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5644 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5645 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5648 Version 1.15.1 (2017-02-09)
5649 ===========================
5651 * [Fix IntoIter::as_mut_slice's signature][39466]
5652 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5654 [39466]: https://github.com/rust-lang/rust/pull/39466
5655 [39523]: https://github.com/rust-lang/rust/pull/39523
5658 Version 1.15.0 (2017-02-02)
5659 ===========================
5664 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5665 stable. This allows popular code-generating crates like Serde and Diesel to
5666 work ergonomically. [RFC 1681].
5667 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5668 with curly braces][36868]. Part of [RFC 1506].
5669 * [A number of minor changes to name resolution have been activated][37127].
5670 They add up to more consistent semantics, allowing for future evolution of
5671 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5672 details of what is different. The breaking changes here have been transitioned
5673 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5674 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5676 * [`?Sized` can be used in `where` clauses][37791]
5677 * [There is now a limit on the size of monomorphized types and it can be
5678 modified with the `#![type_size_limit]` crate attribute, similarly to
5679 the `#![recursion_limit]` attribute][37789]
5684 * [On Windows, the compiler will apply dllimport attributes when linking to
5685 extern functions][37973]. Additional attributes and flags can control which
5686 library kind is linked and its name. [RFC 1717].
5687 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5688 * [The `--test` flag works with procedural macro crates][38107]
5689 * [Fix `extern "aapcs" fn` ABI][37814]
5690 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5691 * [The `format!` expander recognizes incorrect `printf` and shell-style
5692 formatting directives and suggests the correct format][37613].
5693 * [Only report one error for all unused imports in an import list][37456]
5695 Compiler Performance
5696 --------------------
5698 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5699 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5700 * [Don't clone in `UnificationTable::probe`][37848]
5701 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5702 * [Use small vectors in type walker][37760]
5703 * [Macro expansion performance was improved][37701]
5704 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5705 * [Replace FNV with a faster hash function][37229]
5710 * [`std::iter::Iterator::min_by`]
5711 * [`std::iter::Iterator::max_by`]
5712 * [`std::os::*::fs::FileExt`]
5713 * [`std::sync::atomic::Atomic*::get_mut`]
5714 * [`std::sync::atomic::Atomic*::into_inner`]
5715 * [`std::vec::IntoIter::as_slice`]
5716 * [`std::vec::IntoIter::as_mut_slice`]
5717 * [`std::sync::mpsc::Receiver::try_iter`]
5718 * [`std::os::unix::process::CommandExt::before_exec`]
5719 * [`std::rc::Rc::strong_count`]
5720 * [`std::rc::Rc::weak_count`]
5721 * [`std::sync::Arc::strong_count`]
5722 * [`std::sync::Arc::weak_count`]
5723 * [`std::char::encode_utf8`]
5724 * [`std::char::encode_utf16`]
5725 * [`std::cell::Ref::clone`]
5726 * [`std::io::Take::into_inner`]
5731 * [The standard sorting algorithm has been rewritten for dramatic performance
5732 improvements][38192]. It is a hybrid merge sort, drawing influences from
5733 Timsort. Previously it was a naive merge sort.
5734 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5735 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5737 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5738 and `char_indices().last()`][37882]
5739 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5740 * [Chinese characters display correctly in `fmt::Debug`][37855]
5741 * [Derive `Default` for `Duration`][37699]
5742 * [Support creation of anonymous pipes on WinXP/2k][37677]
5743 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5744 * [Don't pass overlapped handles to processes][38835]
5749 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5750 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5751 should instead check the variable at runtime with `std::env`. That the value
5752 was set at build time was a bug, and incorrect when cross-compiling. This
5753 change is known to cause breakage.
5754 * [Add `--all` flag to `cargo test`][cargo/3221]
5755 * [Compile statically against the MSVC CRT][cargo/3363]
5756 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5757 * [Link OpenSSL statically on OSX][cargo/3311]
5758 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5759 * [Test for bad path overrides with summaries][cargo/3336]
5760 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5761 * [Fix retrying crate downloads for network errors][cargo/3348]
5762 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5763 * [Emit more info on --message-format=json][cargo/3319]
5764 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5765 * [Don't ignore errors in workspace manifest][cargo/3409]
5766 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5771 * [Test runners (binaries built with `--test`) now support a `--list` argument
5772 that lists the tests it contains][38185]
5773 * [Test runners now support a `--exact` argument that makes the test filter
5774 match exactly, instead of matching only a substring of the test name][38181]
5775 * [rustdoc supports a `--playground-url` flag][37763]
5776 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5781 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5782 continue to be used in this release by passing `--disable-rustbuild` to the
5783 configure script, but they will be deleted soon. Note that the new build
5784 system uses a different on-disk layout that will likely affect any scripts
5786 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5788 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5789 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5795 * [A number of minor changes to name resolution have been activated][37127].
5796 They add up to more consistent semantics, allowing for future evolution of
5797 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5798 details of what is different. The breaking changes here have been transitioned
5799 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5800 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5801 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5802 should instead check the variable at runtime with `std::env`. That the value
5803 was set at build time was a bug, and incorrect when cross-compiling. This
5804 change is known to cause breakage.
5805 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5806 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5807 1.10 and is now an error by default. It will become a hard error in the near
5809 * [The semantics relating modules to file system directories are changing in
5810 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5811 lint, which is a warning in this release, and will become a hard error in the
5813 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5814 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5815 the underlying iterator][37834]
5817 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5818 [33685]: https://github.com/rust-lang/rust/issues/33685
5819 [36868]: https://github.com/rust-lang/rust/pull/36868
5820 [37127]: https://github.com/rust-lang/rust/pull/37127
5821 [37229]: https://github.com/rust-lang/rust/pull/37229
5822 [37456]: https://github.com/rust-lang/rust/pull/37456
5823 [37527]: https://github.com/rust-lang/rust/pull/37527
5824 [37602]: https://github.com/rust-lang/rust/pull/37602
5825 [37613]: https://github.com/rust-lang/rust/pull/37613
5826 [37615]: https://github.com/rust-lang/rust/pull/37615
5827 [37636]: https://github.com/rust-lang/rust/pull/37636
5828 [37627]: https://github.com/rust-lang/rust/pull/37627
5829 [37642]: https://github.com/rust-lang/rust/pull/37642
5830 [37677]: https://github.com/rust-lang/rust/pull/37677
5831 [37699]: https://github.com/rust-lang/rust/pull/37699
5832 [37701]: https://github.com/rust-lang/rust/pull/37701
5833 [37705]: https://github.com/rust-lang/rust/pull/37705
5834 [37749]: https://github.com/rust-lang/rust/pull/37749
5835 [37760]: https://github.com/rust-lang/rust/pull/37760
5836 [37763]: https://github.com/rust-lang/rust/pull/37763
5837 [37764]: https://github.com/rust-lang/rust/pull/37764
5838 [37789]: https://github.com/rust-lang/rust/pull/37789
5839 [37791]: https://github.com/rust-lang/rust/pull/37791
5840 [37814]: https://github.com/rust-lang/rust/pull/37814
5841 [37817]: https://github.com/rust-lang/rust/pull/37817
5842 [37834]: https://github.com/rust-lang/rust/pull/37834
5843 [37848]: https://github.com/rust-lang/rust/pull/37848
5844 [37855]: https://github.com/rust-lang/rust/pull/37855
5845 [37882]: https://github.com/rust-lang/rust/pull/37882
5846 [37888]: https://github.com/rust-lang/rust/pull/37888
5847 [37973]: https://github.com/rust-lang/rust/pull/37973
5848 [37979]: https://github.com/rust-lang/rust/pull/37979
5849 [38086]: https://github.com/rust-lang/rust/pull/38086
5850 [38107]: https://github.com/rust-lang/rust/pull/38107
5851 [38117]: https://github.com/rust-lang/rust/pull/38117
5852 [38134]: https://github.com/rust-lang/rust/pull/38134
5853 [38146]: https://github.com/rust-lang/rust/pull/38146
5854 [38181]: https://github.com/rust-lang/rust/pull/38181
5855 [38182]: https://github.com/rust-lang/rust/pull/38182
5856 [38185]: https://github.com/rust-lang/rust/pull/38185
5857 [38192]: https://github.com/rust-lang/rust/pull/38192
5858 [38279]: https://github.com/rust-lang/rust/pull/38279
5859 [38835]: https://github.com/rust-lang/rust/pull/38835
5860 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5861 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5862 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5863 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5864 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5865 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5866 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5867 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5868 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5869 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5870 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5871 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5872 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5873 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5874 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5875 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5876 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5877 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5878 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5879 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5880 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5881 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5882 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5883 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5884 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5885 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5886 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5887 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5888 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5889 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5890 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5891 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5892 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5893 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5894 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5895 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5896 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5897 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5900 Version 1.14.0 (2016-12-22)
5901 ===========================
5906 * [`..` matches multiple tuple fields in enum variants, structs
5907 and tuples][36843]. [RFC 1492].
5908 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5909 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5910 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5911 dereferencing][36822]
5916 * [Mark enums with non-zero discriminant as non-zero][37224]
5917 * [Lower-case `static mut` names are linted like other
5918 statics and consts][37162]
5919 * [Fix ICE on some macros in const integer positions
5920 (e.g. `[u8; m!()]`)][36819]
5921 * [Improve error message and snippet for "did you mean `x`"][36798]
5922 * [Add a panic-strategy field to the target specification][36794]
5923 * [Include LLVM version in `--version --verbose`][37200]
5925 Compile-time Optimizations
5926 --------------------------
5928 * [Improve macro expansion performance][37569]
5929 * [Shrink `Expr_::ExprInlineAsm`][37445]
5930 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5931 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5932 * [Avoid more allocations when compiling html5ever][37373]
5933 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5934 * [Avoid some allocations in the macro parser][37318]
5935 * [Use a faster deflate setting][37298]
5936 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5937 during interning of slices][37270]
5938 * [Optimize `write_metadata`][37267]
5939 * [Don't process obligation forest cycles when stalled][37231]
5940 * [Avoid many `CrateConfig` clones][37161]
5941 * [Optimize `Substs::super_fold_with`][37108]
5942 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5943 * [Speed up `plug_leaks`][36917]
5948 * [`println!()`, with no arguments, prints newline][36825].
5949 Previously, an empty string was required to achieve the same.
5950 * [`Wrapping` impls standard binary and unary operators, as well as
5951 the `Sum` and `Product` iterators][37356]
5952 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5954 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5955 `VecDeque` iterators][37315]
5956 * [Improve `SipHasher` performance on small values][37312]
5957 * [Add Iterator trait TrustedLen to enable better FromIterator /
5959 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5960 * [`ReadDir` implements `Debug`][37221]
5961 * [Implement `RefUnwindSafe` for atomic types][37178]
5962 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5963 * [Avoid allocations in `Decoder::read_str`][37064]
5964 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5965 * [Impl `Debug` for raw pointers to unsized data][36880]
5966 * [Don't reuse `HashMap` random seeds][37470]
5967 * [The internal memory layout of `HashMap` is more cache-friendly, for
5968 significant improvements in some operations][36692]
5969 * [`HashMap` uses less memory on 32-bit architectures][36595]
5970 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5975 * [Expose rustc cfg values to build scripts][cargo/3243]
5976 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5977 * [Fix passing --features when testing multiple packages][cargo/3280]
5978 * [Use a single profile set per workspace][cargo/3249]
5979 * [Load `replace` sections from lock files][cargo/3220]
5980 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5985 * [rustup is the recommended Rust installation method][1.14rustup]
5986 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5987 S390x. These are [tier 2] platforms and may have major defects. Follow the
5988 instructions on the website to install, or add the targets to an existing
5989 installation with `rustup target add`. The new target triples are:
5990 - `mips-unknown-linux-gnu`
5991 - `mipsel-unknown-linux-gnu`
5992 - `mips64-unknown-linux-gnuabi64`
5993 - `mips64el-unknown-linux-gnuabi64 `
5994 - `powerpc-unknown-linux-gnu`
5995 - `powerpc64-unknown-linux-gnu`
5996 - `powerpc64le-unknown-linux-gnu`
5997 - `s390x-unknown-linux-gnu `
5998 * This release includes target (std) builds for ARM Linux running MUSL
5999 libc. These are [tier 2] platforms and may have major defects. Add the
6000 following triples to an existing rustup installation with `rustup target add`:
6001 - `arm-unknown-linux-musleabi`
6002 - `arm-unknown-linux-musleabihf`
6003 - `armv7-unknown-linux-musleabihf`
6004 * This release includes [experimental support for WebAssembly][1.14wasm], via
6005 the `wasm32-unknown-emscripten` target. This target is known to have major
6006 defects. Please test, report, and fix.
6007 * rustup no longer installs documentation by default. Run `rustup
6008 component add rust-docs` to install.
6009 * [Fix line stepping in debugger][37310]
6010 * [Enable line number debuginfo in releases][37280]
6015 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6016 * [Add support for Fuchsia OS][37313]
6017 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6022 * [A number of forward-compatibility lints used by the compiler
6023 to gradually introduce language changes have been converted
6024 to deny by default][36894]:
6025 - ["use of inaccessible extern crate erroneously allowed"][36886]
6026 - ["type parameter default erroneously allowed in invalid location"][36887]
6027 - ["detects super or self keywords at the beginning of global path"][36888]
6028 - ["two overlapping inherent impls define an item with the same name
6029 were erroneously allowed"][36889]
6030 - ["floating-point constants cannot be used in patterns"][36890]
6031 - ["constants of struct or enum type can only be used in a pattern if
6032 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6033 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6034 * [Prohibit patterns in trait methods without bodies][37378]
6035 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6036 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6037 * [The `$crate` macro variable is accepted in fewer locations][37213]
6038 * [Impls specifying extra region requirements beyond the trait
6039 they implement are rejected][37167]
6040 * [Enums may not be unsized][37111]. Unsized enums are intended to
6041 work but never have. For now they are forbidden.
6042 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6044 [tier 2]: https://forge.rust-lang.org/platform-support.html
6045 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6046 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6047 [36430]: https://github.com/rust-lang/rust/pull/36430
6048 [36595]: https://github.com/rust-lang/rust/pull/36595
6049 [36595]: https://github.com/rust-lang/rust/pull/36595
6050 [36692]: https://github.com/rust-lang/rust/pull/36692
6051 [36767]: https://github.com/rust-lang/rust/pull/36767
6052 [36794]: https://github.com/rust-lang/rust/pull/36794
6053 [36798]: https://github.com/rust-lang/rust/pull/36798
6054 [36819]: https://github.com/rust-lang/rust/pull/36819
6055 [36822]: https://github.com/rust-lang/rust/pull/36822
6056 [36825]: https://github.com/rust-lang/rust/pull/36825
6057 [36843]: https://github.com/rust-lang/rust/pull/36843
6058 [36880]: https://github.com/rust-lang/rust/pull/36880
6059 [36886]: https://github.com/rust-lang/rust/issues/36886
6060 [36887]: https://github.com/rust-lang/rust/issues/36887
6061 [36888]: https://github.com/rust-lang/rust/issues/36888
6062 [36889]: https://github.com/rust-lang/rust/issues/36889
6063 [36890]: https://github.com/rust-lang/rust/issues/36890
6064 [36891]: https://github.com/rust-lang/rust/issues/36891
6065 [36892]: https://github.com/rust-lang/rust/issues/36892
6066 [36894]: https://github.com/rust-lang/rust/pull/36894
6067 [36917]: https://github.com/rust-lang/rust/pull/36917
6068 [36993]: https://github.com/rust-lang/rust/pull/36993
6069 [37037]: https://github.com/rust-lang/rust/pull/37037
6070 [37064]: https://github.com/rust-lang/rust/pull/37064
6071 [37094]: https://github.com/rust-lang/rust/pull/37094
6072 [37108]: https://github.com/rust-lang/rust/pull/37108
6073 [37111]: https://github.com/rust-lang/rust/pull/37111
6074 [37161]: https://github.com/rust-lang/rust/pull/37161
6075 [37162]: https://github.com/rust-lang/rust/pull/37162
6076 [37167]: https://github.com/rust-lang/rust/pull/37167
6077 [37178]: https://github.com/rust-lang/rust/pull/37178
6078 [37200]: https://github.com/rust-lang/rust/pull/37200
6079 [37213]: https://github.com/rust-lang/rust/pull/37213
6080 [37221]: https://github.com/rust-lang/rust/pull/37221
6081 [37224]: https://github.com/rust-lang/rust/pull/37224
6082 [37230]: https://github.com/rust-lang/rust/pull/37230
6083 [37231]: https://github.com/rust-lang/rust/pull/37231
6084 [37247]: https://github.com/rust-lang/rust/pull/37247
6085 [37267]: https://github.com/rust-lang/rust/pull/37267
6086 [37270]: https://github.com/rust-lang/rust/pull/37270
6087 [37273]: https://github.com/rust-lang/rust/pull/37273
6088 [37280]: https://github.com/rust-lang/rust/pull/37280
6089 [37298]: https://github.com/rust-lang/rust/pull/37298
6090 [37306]: https://github.com/rust-lang/rust/pull/37306
6091 [37310]: https://github.com/rust-lang/rust/pull/37310
6092 [37312]: https://github.com/rust-lang/rust/pull/37312
6093 [37313]: https://github.com/rust-lang/rust/pull/37313
6094 [37315]: https://github.com/rust-lang/rust/pull/37315
6095 [37318]: https://github.com/rust-lang/rust/pull/37318
6096 [37322]: https://github.com/rust-lang/rust/pull/37322
6097 [37326]: https://github.com/rust-lang/rust/pull/37326
6098 [37351]: https://github.com/rust-lang/rust/pull/37351
6099 [37356]: https://github.com/rust-lang/rust/pull/37356
6100 [37367]: https://github.com/rust-lang/rust/pull/37367
6101 [37373]: https://github.com/rust-lang/rust/pull/37373
6102 [37378]: https://github.com/rust-lang/rust/pull/37378
6103 [37389]: https://github.com/rust-lang/rust/pull/37389
6104 [37392]: https://github.com/rust-lang/rust/pull/37392
6105 [37427]: https://github.com/rust-lang/rust/pull/37427
6106 [37439]: https://github.com/rust-lang/rust/pull/37439
6107 [37445]: https://github.com/rust-lang/rust/pull/37445
6108 [37470]: https://github.com/rust-lang/rust/pull/37470
6109 [37569]: https://github.com/rust-lang/rust/pull/37569
6110 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6111 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6112 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6113 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6114 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6115 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6116 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6119 Version 1.13.0 (2016-11-10)
6120 ===========================
6125 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6126 errors, like the `try!` macro, described in [RFC 0243].
6127 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6128 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6129 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6130 * [Fix lifetime rules for 'if' conditions][36029]
6131 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6136 * [Add the `-C link-arg` argument][36574]
6137 * [Remove the old AST-based backend from rustc_trans][35764]
6138 * [Don't enable NEON by default on armv7 Linux][35814]
6139 * [Fix debug line number info for macro expansions][35238]
6140 * [Do not emit "class method" debuginfo for types that are not
6141 DICompositeType][36008]
6142 * [Warn about multiple conflicting #[repr] hints][34623]
6143 * [When sizing DST, don't double-count nested struct prefixes][36351]
6144 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6145 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6146 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6147 * [Expand macros without recursing to avoid stack overflows][36214]
6152 * [Replace macro backtraces with labeled local uses][35702]
6153 * [Improve error message for misplaced doc comments][33922]
6154 * [Buffer unix and lock windows to prevent message interleaving][35975]
6155 * [Update lifetime errors to specifically note temporaries][36171]
6156 * [Special case a few colors for Windows][36178]
6157 * [Suggest `use self` when such an import resolves][36289]
6158 * [Be more specific when type parameter shadows primitive type][36338]
6159 * Many minor improvements
6161 Compile-time Optimizations
6162 --------------------------
6164 * [Compute and cache HIR hashes at beginning][35854]
6165 * [Don't hash types in loan paths][36004]
6166 * [Cache projections in trans][35761]
6167 * [Optimize the parser's last token handling][36527]
6168 * [Only instantiate #[inline] functions in codegen units referencing
6169 them][36524]. This leads to big improvements in cases where crates export
6170 define many inline functions without using them directly.
6171 * [Lazily allocate TypedArena's first chunk][36592]
6172 * [Don't allocate during default HashSet creation][36734]
6179 * [`overflowing_abs`]
6180 * [`RefCell::try_borrow`]
6181 * [`RefCell::try_borrow_mut`]
6186 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6187 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6189 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6190 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6191 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6192 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6193 * [Use arc4rand on FreeBSD][35884]
6194 * [memrchr: Correct aligned offset computation][35969]
6195 * [Improve Demangling of Rust Symbols][36059]
6196 * [Use monotonic time in condition variables][35048]
6197 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6198 * [Implement conversion traits for `char`][35755]
6199 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6200 * [Zero first byte of CString on drop][36264]
6201 * [Inherit overflow checks for sum and product][36372]
6202 * [Add missing Eq implementations][36423]
6203 * [Implement `Debug` for `DirEntry`][36631]
6204 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6206 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6207 * [Implement more traits for `std::io::ErrorKind`][35911]
6208 * [Optimize BinaryHeap bounds checking][36072]
6209 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6210 `extend_with_element`][36355]
6211 * [Fix overflow checking in unsigned pow()][34942]
6216 * This release includes security fixes to both curl and OpenSSL.
6217 * [Fix transitive doctests when panic=abort][cargo/3021]
6218 * [Add --all-features flag to cargo][cargo/3038]
6219 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6220 * [Don't parse the home directory more than once][cargo/3078]
6221 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6222 * [Update OpenSSL to 1.0.2j][cargo/3121]
6223 * [Add license and license_file to cargo metadata output][cargo/3110]
6224 * [Make crates-io registry URL optional in config; ignore all changes to
6225 source.crates-io][cargo/3089]
6226 * [Don't download dependencies from other platforms][cargo/3123]
6227 * [Build transitive dev-dependencies when needed][cargo/3125]
6228 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6229 * [Avoid updating registry when adding existing deps][cargo/3144]
6230 * [Warn about path overrides that won't work][cargo/3136]
6231 * [Use workspaces during `cargo install`][cargo/3146]
6232 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6233 * [Add --message-format flag][cargo/3000]
6234 * [Pass target environment for rustdoc][cargo/3205]
6235 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6236 * [Update curl and curl-sys][cargo/3241]
6237 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6242 * [rustdoc: Add the `--sysroot` argument][36586]
6243 * [rustdoc: Fix a couple of issues with the search results][35655]
6244 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6245 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6246 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6251 * [Remove unmaintained style guide][35124]
6252 * [Add s390x support][36369]
6253 * [Initial work at Haiku OS support][36727]
6254 * [Add mips-uclibc targets][35734]
6255 * [Crate-ify compiler-rt into compiler-builtins][35021]
6256 * [Add rustc version info (git hash + date) to dist tarball][36213]
6257 * Many documentation improvements
6262 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6263 * [Deny (by default) transmuting from fn item types to pointer-sized
6264 types][34923]. Continuing the long transition to zero-sized fn items,
6266 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6268 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6269 * [Fix lifetime rules for 'if' conditions][36029].
6270 * [Inherit overflow checks for sum and product][36372].
6271 * [Forbid user-defined macros named "macro_rules"][36730].
6273 [33922]: https://github.com/rust-lang/rust/pull/33922
6274 [34623]: https://github.com/rust-lang/rust/pull/34623
6275 [34923]: https://github.com/rust-lang/rust/pull/34923
6276 [34942]: https://github.com/rust-lang/rust/pull/34942
6277 [34982]: https://github.com/rust-lang/rust/pull/34982
6278 [35021]: https://github.com/rust-lang/rust/pull/35021
6279 [35048]: https://github.com/rust-lang/rust/pull/35048
6280 [35074]: https://github.com/rust-lang/rust/pull/35074
6281 [35124]: https://github.com/rust-lang/rust/pull/35124
6282 [35234]: https://github.com/rust-lang/rust/pull/35234
6283 [35238]: https://github.com/rust-lang/rust/pull/35238
6284 [35354]: https://github.com/rust-lang/rust/pull/35354
6285 [35559]: https://github.com/rust-lang/rust/pull/35559
6286 [35585]: https://github.com/rust-lang/rust/pull/35585
6287 [35627]: https://github.com/rust-lang/rust/pull/35627
6288 [35655]: https://github.com/rust-lang/rust/pull/35655
6289 [35702]: https://github.com/rust-lang/rust/pull/35702
6290 [35707]: https://github.com/rust-lang/rust/pull/35707
6291 [35728]: https://github.com/rust-lang/rust/pull/35728
6292 [35734]: https://github.com/rust-lang/rust/pull/35734
6293 [35755]: https://github.com/rust-lang/rust/pull/35755
6294 [35761]: https://github.com/rust-lang/rust/pull/35761
6295 [35764]: https://github.com/rust-lang/rust/pull/35764
6296 [35814]: https://github.com/rust-lang/rust/pull/35814
6297 [35854]: https://github.com/rust-lang/rust/pull/35854
6298 [35871]: https://github.com/rust-lang/rust/pull/35871
6299 [35884]: https://github.com/rust-lang/rust/pull/35884
6300 [35911]: https://github.com/rust-lang/rust/pull/35911
6301 [35969]: https://github.com/rust-lang/rust/pull/35969
6302 [35975]: https://github.com/rust-lang/rust/pull/35975
6303 [36004]: https://github.com/rust-lang/rust/pull/36004
6304 [36008]: https://github.com/rust-lang/rust/pull/36008
6305 [36014]: https://github.com/rust-lang/rust/pull/36014
6306 [36029]: https://github.com/rust-lang/rust/pull/36029
6307 [36059]: https://github.com/rust-lang/rust/pull/36059
6308 [36072]: https://github.com/rust-lang/rust/pull/36072
6309 [36101]: https://github.com/rust-lang/rust/pull/36101
6310 [36104]: https://github.com/rust-lang/rust/pull/36104
6311 [36171]: https://github.com/rust-lang/rust/pull/36171
6312 [36173]: https://github.com/rust-lang/rust/pull/36173
6313 [36178]: https://github.com/rust-lang/rust/pull/36178
6314 [36213]: https://github.com/rust-lang/rust/pull/36213
6315 [36214]: https://github.com/rust-lang/rust/pull/36214
6316 [36264]: https://github.com/rust-lang/rust/pull/36264
6317 [36266]: https://github.com/rust-lang/rust/pull/36266
6318 [36289]: https://github.com/rust-lang/rust/pull/36289
6319 [36338]: https://github.com/rust-lang/rust/pull/36338
6320 [36351]: https://github.com/rust-lang/rust/pull/36351
6321 [36355]: https://github.com/rust-lang/rust/pull/36355
6322 [36369]: https://github.com/rust-lang/rust/pull/36369
6323 [36372]: https://github.com/rust-lang/rust/pull/36372
6324 [36423]: https://github.com/rust-lang/rust/pull/36423
6325 [36482]: https://github.com/rust-lang/rust/pull/36482
6326 [36505]: https://github.com/rust-lang/rust/pull/36505
6327 [36524]: https://github.com/rust-lang/rust/pull/36524
6328 [36527]: https://github.com/rust-lang/rust/pull/36527
6329 [36551]: https://github.com/rust-lang/rust/pull/36551
6330 [36574]: https://github.com/rust-lang/rust/pull/36574
6331 [36586]: https://github.com/rust-lang/rust/pull/36586
6332 [36592]: https://github.com/rust-lang/rust/pull/36592
6333 [36631]: https://github.com/rust-lang/rust/pull/36631
6334 [36639]: https://github.com/rust-lang/rust/pull/36639
6335 [36721]: https://github.com/rust-lang/rust/pull/36721
6336 [36727]: https://github.com/rust-lang/rust/pull/36727
6337 [36730]: https://github.com/rust-lang/rust/pull/36730
6338 [36734]: https://github.com/rust-lang/rust/pull/36734
6339 [36754]: https://github.com/rust-lang/rust/pull/36754
6340 [36995]: https://github.com/rust-lang/rust/pull/36995
6341 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6342 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6343 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6344 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6345 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6346 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6347 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6348 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6349 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6350 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6351 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6352 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6353 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6354 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6355 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6356 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6357 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6358 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6359 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6360 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6361 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6362 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6363 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6364 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6365 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6366 [rustup]: https://www.rustup.rs
6367 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6368 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6369 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6370 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6371 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6372 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6373 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6376 Version 1.12.1 (2016-10-20)
6377 ===========================
6382 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6383 * [Confusion with double negation and booleans][36856]
6384 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6385 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6386 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6387 * [Corrupted memory after updated to 1.12][36936]
6388 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6389 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6390 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6392 [36381]: https://github.com/rust-lang/rust/issues/36381
6393 [36856]: https://github.com/rust-lang/rust/issues/36856
6394 [36875]: https://github.com/rust-lang/rust/issues/36875
6395 [36924]: https://github.com/rust-lang/rust/issues/36924
6396 [36926]: https://github.com/rust-lang/rust/issues/36926
6397 [36936]: https://github.com/rust-lang/rust/issues/36936
6398 [37026]: https://github.com/rust-lang/rust/issues/37026
6399 [37112]: https://github.com/rust-lang/rust/issues/37112
6400 [37153]: https://github.com/rust-lang/rust/issues/37153
6403 Version 1.12.0 (2016-09-29)
6404 ===========================
6409 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6410 This translation pass is far simpler than the previous AST->LLVM pass, and
6411 creates opportunities to perform new optimizations directly on the MIR. It
6412 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6413 * [`rustc` presents a new, more readable error format, along with
6414 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6415 Most common editors supporting Rust have been updated to work with it. It was
6416 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6421 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6422 This translation pass is far simpler than the previous AST->LLVM pass, and
6423 creates opportunities to perform new optimizations directly on the MIR. It
6424 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6425 * [Print the Rust target name, not the LLVM target name, with
6426 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6427 * [The computation of `TypeId` is correct in some cases where it was previously
6428 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6429 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6430 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6431 `--print relocation-models`, and `--print code-models` print the available
6432 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6433 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6434 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6435 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6436 These targets produce statically-linked binaries. There are no binary release
6442 * [`rustc` presents a new, more readable error format, along with
6443 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6444 Most common editors supporting Rust have been updated to work with it. It was
6445 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6446 * [In error descriptions, references are now described in plain English,
6447 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6448 * [In error type descriptions, unknown numeric types are named `{integer}` or
6449 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6450 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6455 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6456 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6457 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6458 useful](https://github.com/rust-lang/rust/pull/34908)
6459 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6460 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6461 * [Semicolons are properly required as statement delimiters inside
6462 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6463 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6468 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6469 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6470 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6471 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6472 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6473 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6474 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6475 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6476 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6477 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6478 Both on Unix and Windows.
6479 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6480 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6481 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6482 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6483 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6484 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6485 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6486 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6491 * [The `format!` macro and friends now allow a single argument to be formatted
6492 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6493 * [The lifetime bounds on `[T]::binary_search_by` and
6494 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6495 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6496 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6497 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6498 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6499 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6500 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6501 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6502 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6503 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6504 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6505 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6506 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6507 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6508 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6509 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6510 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6511 * [`mpsc::sync_channel` `Receiver`s return any available message before
6512 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6513 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6514 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6519 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6520 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6521 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6522 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6523 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6524 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6525 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6526 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6527 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6528 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6529 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6530 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6531 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6532 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6533 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6534 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6539 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6540 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6545 * [Test binaries now support a `--test-threads` argument to specify the number
6546 of threads used to run tests, and which acts the same as the
6547 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6548 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6549 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6550 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6551 * [Rust releases now come with source packages that can be installed by rustup
6552 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6553 The resulting source code can be used by tools and IDES, located in the
6554 sysroot under `lib/rustlib/src`.
6559 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6560 * Many minor improvements to the documentation.
6561 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6566 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6567 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6568 * [When formatting strings, if "precision" is specified, the "fill",
6569 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6570 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6573 Version 1.11.0 (2016-08-18)
6574 ===========================
6579 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6580 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6581 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6582 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6587 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6588 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6589 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6590 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6591 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6592 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6593 (in libcore - previously stabilized in libstd)
6594 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6595 (in libcore - previously stabilized in libstd)
6596 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6597 (in libcore - previously stabilized in libstd)
6598 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6599 (in libcore - previously stabilized in libstd)
6600 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6601 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6602 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6603 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6608 * [The `thread_local!` macro supports multiple definitions in a single
6609 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6610 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6611 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6612 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6613 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6614 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6615 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6616 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6621 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6622 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6623 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6624 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6625 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6626 and `-vv` prints warnings for all crates.
6627 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6628 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6629 This provides room for expansion by arbitrary tools.
6630 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6631 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6632 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6633 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6634 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6635 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6636 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6641 * [Caching projections speeds up type check dramatically for some
6642 workloads](https://github.com/rust-lang/rust/pull/33816)
6643 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6644 This hasher is faster, but is believed to provide sufficient
6645 protection from collision attacks.
6646 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6651 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6652 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6653 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6654 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6655 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6660 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6661 * [When emitting debug info, rustc emits frame pointers for closures,
6662 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6663 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6664 * Many more errors have been given error codes and extended
6666 * API documentation continues to be improved, with many new examples
6671 * [rustc no longer hangs when dependencies recursively re-export
6672 submodules](https://github.com/rust-lang/rust/pull/34542)
6673 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6674 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6675 rewritten](https://github.com/rust-lang/rust/pull/33895)
6676 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6677 No targets use this yet, but it works toward AVR support.
6682 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6683 * [The new follow-set rules that place restrictions on `macro_rules!`
6684 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6685 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6686 and has been a warning since 1.10.
6687 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6688 This causes breakage in some corner cases.
6691 Version 1.10.0 (2016-07-07)
6692 ===========================
6697 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6698 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6699 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6700 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6701 * [`panic!` can be converted to a runtime abort with the
6702 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6703 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6704 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6705 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6706 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6707 Note that Cargo does not yet directly support cdylibs.
6712 * `os::windows::fs::OpenOptionsExt::access_mode`
6713 * `os::windows::fs::OpenOptionsExt::share_mode`
6714 * `os::windows::fs::OpenOptionsExt::custom_flags`
6715 * `os::windows::fs::OpenOptionsExt::attributes`
6716 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6717 * `os::unix::fs::OpenOptionsExt::custom_flags`
6718 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6719 * `Default for sync::Weak`
6720 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6721 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6722 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6723 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6724 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6725 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6726 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6727 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6728 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6729 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6730 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6731 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6732 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6733 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6734 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6735 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6736 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6737 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6738 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6739 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6740 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6741 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6742 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6743 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6744 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6745 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6746 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6747 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6748 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6749 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6750 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6751 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6752 * Read/Write/RawFd impls for `UnixStream`
6753 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6754 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6755 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6756 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6757 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6758 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6759 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6760 * RawFd impls for `UnixListener`
6761 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6762 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6763 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6764 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6765 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6766 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6767 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6768 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6769 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6770 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6771 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6772 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6773 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6774 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6775 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6776 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6777 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6778 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6779 * RawFd impls for `UnixDatagram`
6780 * `{BTree,Hash}Map::values_mut`
6781 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6786 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6787 The semantics of this minor method are subtle and probably not what
6789 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6790 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6791 will fall back to `/dev/urandom` temporarily to avoid blocking
6792 during early boot](https://github.com/rust-lang/rust/pull/33086).
6793 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6794 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6795 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6796 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6797 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6798 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6799 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6803 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6804 This controls the runtime behavior of the `panic!` macro
6805 and can be either "unwind" (the default), or "abort".
6806 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6807 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6808 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6809 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6810 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6811 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6812 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6813 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6814 By default they are retried twice, which can be customized with the
6815 `net.retry` value in `.cargo/config`.
6816 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6817 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6818 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6819 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6820 Makes it possible to install multiple crates in parallel.
6821 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6822 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6823 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6824 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6825 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6826 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6831 * [rustc memory usage was reduced by refactoring the context used for
6832 type checking](https://github.com/rust-lang/rust/pull/33425).
6833 * [Speed up creation of `HashMap`s by caching the random keys used
6834 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6835 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6836 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6837 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6838 10x faster than the previous lookup tables.
6839 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6844 * Many incremental improvements to documentation and rustdoc.
6845 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6846 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6847 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6848 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6849 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6850 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6851 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6856 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6857 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6858 * [`std` no longer prints backtraces on platforms where the running
6859 module must be loaded with `env::current_exe`, which can't be relied
6860 on](https://github.com/rust-lang/rust/pull/33554).
6861 * This release includes std binaries for the i586-unknown-linux-gnu,
6862 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6863 i586 target is for old x86 hardware without SSE2, and the armv7
6864 target is for Android running on modern ARM architectures.
6865 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6866 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6867 * [On Unix the runtime aborts by calling `libc::abort` instead of
6868 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6869 * [Rust is now bootstrapped from the previous release of Rust,
6870 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6875 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6876 * [`target_env` for Linux ARM targets is just `gnu`, not
6877 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6878 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6879 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6880 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6881 Affects how macros are parsed.
6882 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6883 * [Feature-gated attributes on macro-generated macro invocations are
6884 now rejected](https://github.com/rust-lang/rust/pull/32791).
6885 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6886 This caused some minor changes to type inference.
6889 Version 1.9.0 (2016-05-26)
6890 ==========================
6895 * The `#[deprecated]` attribute when applied to an API will generate
6896 warnings when used. The warnings may be suppressed with
6897 `#[allow(deprecated)]`. [RFC 1270].
6898 * [`fn` item types are zero sized, and each `fn` names a unique
6899 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6900 `transmute` on a `fn` type will generate a warning for a few cycles,
6901 then will be converted to an error.
6902 * [Field and method resolution understand visibility, so private
6903 fields and methods cannot prevent the proper use of public fields
6904 and methods][1.9fv].
6905 * [The parser considers unicode codepoints in the
6906 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6912 * [`std::panic::catch_unwind`] (renamed from `recover`)
6913 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6914 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6915 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6916 * [`str::is_char_boundary`]
6917 * [`<*const T>::as_ref`]
6918 * [`<*mut T>::as_ref`]
6919 * [`<*mut T>::as_mut`]
6920 * [`AsciiExt::make_ascii_uppercase`]
6921 * [`AsciiExt::make_ascii_lowercase`]
6922 * [`char::decode_utf16`]
6923 * [`char::DecodeUtf16`]
6924 * [`char::DecodeUtf16Error`]
6925 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6926 * [`BTreeSet::take`]
6927 * [`BTreeSet::replace`]
6930 * [`HashSet::replace`]
6932 * [`OsString::with_capacity`]
6933 * [`OsString::clear`]
6934 * [`OsString::capacity`]
6935 * [`OsString::reserve`]
6936 * [`OsString::reserve_exact`]
6937 * [`OsStr::is_empty`]
6939 * [`std::os::unix::thread`]
6942 * [`JoinHandleExt::as_pthread_t`]
6943 * [`JoinHandleExt::into_pthread_t`]
6944 * [`HashSet::hasher`]
6945 * [`HashMap::hasher`]
6946 * [`CommandExt::exec`]
6947 * [`File::try_clone`]
6948 * [`SocketAddr::set_ip`]
6949 * [`SocketAddr::set_port`]
6950 * [`SocketAddrV4::set_ip`]
6951 * [`SocketAddrV4::set_port`]
6952 * [`SocketAddrV6::set_ip`]
6953 * [`SocketAddrV6::set_port`]
6954 * [`SocketAddrV6::set_flowinfo`]
6955 * [`SocketAddrV6::set_scope_id`]
6956 * [`slice::copy_from_slice`]
6957 * [`ptr::read_volatile`]
6958 * [`ptr::write_volatile`]
6959 * [`OpenOptions::create_new`]
6960 * [`TcpStream::set_nodelay`]
6961 * [`TcpStream::nodelay`]
6962 * [`TcpStream::set_ttl`]
6963 * [`TcpStream::ttl`]
6964 * [`TcpStream::set_only_v6`]
6965 * [`TcpStream::only_v6`]
6966 * [`TcpStream::take_error`]
6967 * [`TcpStream::set_nonblocking`]
6968 * [`TcpListener::set_ttl`]
6969 * [`TcpListener::ttl`]
6970 * [`TcpListener::set_only_v6`]
6971 * [`TcpListener::only_v6`]
6972 * [`TcpListener::take_error`]
6973 * [`TcpListener::set_nonblocking`]
6974 * [`UdpSocket::set_broadcast`]
6975 * [`UdpSocket::broadcast`]
6976 * [`UdpSocket::set_multicast_loop_v4`]
6977 * [`UdpSocket::multicast_loop_v4`]
6978 * [`UdpSocket::set_multicast_ttl_v4`]
6979 * [`UdpSocket::multicast_ttl_v4`]
6980 * [`UdpSocket::set_multicast_loop_v6`]
6981 * [`UdpSocket::multicast_loop_v6`]
6982 * [`UdpSocket::set_multicast_ttl_v6`]
6983 * [`UdpSocket::multicast_ttl_v6`]
6984 * [`UdpSocket::set_ttl`]
6985 * [`UdpSocket::ttl`]
6986 * [`UdpSocket::set_only_v6`]
6987 * [`UdpSocket::only_v6`]
6988 * [`UdpSocket::join_multicast_v4`]
6989 * [`UdpSocket::join_multicast_v6`]
6990 * [`UdpSocket::leave_multicast_v4`]
6991 * [`UdpSocket::leave_multicast_v6`]
6992 * [`UdpSocket::take_error`]
6993 * [`UdpSocket::connect`]
6994 * [`UdpSocket::send`]
6995 * [`UdpSocket::recv`]
6996 * [`UdpSocket::set_nonblocking`]
7001 * [`std::sync::Once` is poisoned if its initialization function
7003 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7004 * [Most types implement `fmt::Debug`][1.9db].
7005 * [The default buffer size used by `BufReader` and `BufWriter` was
7006 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7007 used by other languages.
7008 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7009 `Duration` additionally implements `*=` and `/=`][1.9ta].
7010 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7011 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7012 * [`Chain` implements `BufRead`][1.9ch].
7013 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7018 * [Cargo can now run concurrently][1.9cc].
7019 * [Top-level overrides allow specific revisions of crates to be
7020 overridden through the entire crate graph][1.9ct]. This is intended
7021 to make upgrades easier for large projects, by allowing crates to be
7022 forked temporarily until they've been upgraded and republished.
7023 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7024 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7025 on the commandline][1.9cf]. `rustc` arguments can also be specified
7026 in the `build.rustflags` configuration key.
7031 * [The time complexity of comparing variables for equivalence during type
7032 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7033 to major compilation time improvement in some scenarios.
7034 * [`ToString` is specialized for `str`, giving it the same performance
7035 as `to_owned`][1.9ts].
7036 * [Spawning processes with `Command::output` no longer creates extra
7038 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7039 for C-like enums][1.9cl].
7044 * [Passing the `--quiet` flag to a test runner will produce
7045 much-abbreviated output][1.9q].
7046 * The Rust Project now publishes std binaries for the
7047 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7048 `i586-pc-windows-msvc` targets.
7053 * [`std::sync::Once` is poisoned if its initialization function
7055 * [It is illegal to define methods with the same name in overlapping
7056 inherent `impl` blocks][1.9sn].
7057 * [`fn` item types are zero sized, and each `fn` names a unique
7058 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7059 `transmute` on a `fn` type will generate a warning for a few cycles,
7060 then will be converted to an error.
7061 * [Improvements to const evaluation may trigger new errors when integer
7062 literals are out of range][1.9ce].
7065 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7066 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7067 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7068 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7069 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7070 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7071 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7072 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7073 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7074 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7075 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7076 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7077 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7078 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7079 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7080 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7081 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7082 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7083 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7084 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7085 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7086 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7087 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7088 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7089 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7090 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7091 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7092 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7093 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7094 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7095 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7096 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7097 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7098 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7099 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7100 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7101 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7102 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7103 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7104 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7105 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7106 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7107 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7108 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7109 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7110 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7111 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7112 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7113 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7114 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7115 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7116 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7117 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7118 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7119 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7120 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7121 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7122 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7123 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7124 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7125 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7126 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7127 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7128 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7129 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7130 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7131 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7132 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7133 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7134 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7135 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7136 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7137 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7138 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7139 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7140 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7141 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7142 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7143 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7144 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7145 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7146 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7147 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7148 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7149 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7150 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7151 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7152 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7153 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7154 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7155 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7156 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7157 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7158 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7159 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7160 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7161 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7162 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7163 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7164 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7165 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7166 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7167 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7168 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7169 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7170 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7171 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7172 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7173 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7174 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7177 Version 1.8.0 (2016-04-14)
7178 ==========================
7183 * Rust supports overloading of compound assignment statements like
7184 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7185 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7186 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7188 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7189 addition to the non-braced form, `struct Foo;`. [RFC 218].
7195 * [`str::encode_utf16`] (renamed from `utf16_units`)
7196 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7199 * [`ptr::drop_in_place`]
7201 * [`time::SystemTime`]
7203 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7204 * [`Instant::elapsed`]
7205 * [`SystemTime::now`]
7206 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7207 * [`SystemTime::elapsed`]
7208 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7209 * [`SystemTimeError`]
7210 * [`SystemTimeError::duration`]
7211 * Various impls for `SystemTimeError`
7213 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7214 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7215 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7216 * [The `write!` and `writeln!` macros correctly emit errors if any of
7217 their arguments can't be formatted][1.8w].
7218 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7219 * [The Unix-specific `raw` modules, which contain a number of
7220 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7221 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7222 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7223 across platforms was making it difficult to implement `std`
7224 correctly. Those that need these definitions should use the `libc`
7226 * The Unix-specific `MetadataExt` traits, including
7227 `os::unix::fs::MetadataExt`, which expose values such as inode
7228 numbers [no longer return platform-specific types][1.8r], but
7229 instead return widened integers. [RFC 1415].
7230 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7231 * [Atomic loads and stores are not volatile][1.8a].
7232 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7237 * [Inlining hash functions lead to a 3% compile-time improvement in
7238 some workloads][1.8h].
7239 * When using jemalloc, its symbols are [unprefixed so that it
7240 overrides the libc malloc implementation][1.8h]. This means that for
7241 rustc, LLVM is now using jemalloc, which results in a 6%
7242 compile-time improvement on a specific workload.
7243 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7248 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7249 i686-pc-windows-msvc is now considered a tier-1 platform.
7250 * [The `--print targets` flag prints a list of supported targets][1.8t].
7251 * [The `--print cfg` flag prints the `cfg`s defined for the current
7253 * [`rustc` can be built with an new Cargo-based build system, written
7254 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7255 build system. To enable it configure with `configure --rustbuild`.
7256 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7257 variants while also indicating the total number of missing variants
7258 if more than 3][1.8m].
7259 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7260 * The Rust Project now publishes binary releases of the standard
7261 library for a number of tier-2 targets:
7262 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7263 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7264 `x86_64-rumprun-netbsd`. These can be installed with
7265 tools such as [multirust][1.8mr].
7270 * [`cargo init` creates a new Cargo project in the current
7271 directory][1.8ci]. It is otherwise like `cargo new`.
7272 * [Cargo has configuration keys for `-v` and
7273 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7274 `[term]` section of `.cargo/config`.
7275 * [Configuration keys that evaluate to strings or integers can be set
7276 via environment variables][1.8ce]. For example the `build.jobs` key
7277 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7278 precedence over config files.
7279 * [Target-specific dependencies support Rust `cfg` syntax for
7280 describing targets][1.8cfg] so that dependencies for multiple
7281 targets can be specified together. [RFC 1361].
7282 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7283 `RUSTDOC` take precedence over the `build.target-dir`,
7284 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7285 * [The child process tree is killed on Windows when Cargo is
7287 * [The `build.target` configuration value sets the target platform,
7288 like `--target`][1.8ct].
7293 * [Unstable compiler flags have been further restricted][1.8u]. Since
7294 1.0 `-Z` flags have been considered unstable, and other flags that
7295 were considered unstable additionally required passing `-Z
7296 unstable-options` to access. Unlike unstable language and library
7297 features though, these options have been accessible on the stable
7298 release channel. Going forward, *new unstable flags will not be
7299 available on the stable release channel*, and old unstable flags
7300 will warn about their usage. In the future, all unstable flags will
7301 be unavailable on the stable release channel.
7302 * [It is no longer possible to `match` on empty enum variants using
7303 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7304 * The Unix-specific `MetadataExt` traits, including
7305 `os::unix::fs::MetadataExt`, which expose values such as inode
7306 numbers [no longer return platform-specific types][1.8r], but
7307 instead return widened integers. [RFC 1415].
7308 * [Modules sourced from the filesystem cannot appear within arbitrary
7309 blocks, but only within other modules][1.8mf].
7310 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7311 * On Unix, [stack overflow triggers a runtime abort instead of a
7313 * [`Command::spawn` and its equivalents return an error if any of
7314 its command-line arguments contain interior `NUL`s][1.8n].
7315 * [Tuple and unit enum variants from other crates are in the type
7317 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7318 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7319 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7320 instead of `foo.lib`.
7323 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7324 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7325 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7326 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7327 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7328 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7329 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7330 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7331 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7332 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7333 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7334 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7335 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7336 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7337 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7338 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7339 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7340 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7341 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7342 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7343 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7344 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7345 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7346 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7347 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7348 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7349 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7350 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7351 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7352 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7353 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7354 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7355 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7356 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7357 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7358 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7359 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7360 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7361 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7362 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7363 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7364 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7365 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7366 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7367 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7368 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7369 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7370 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7371 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7372 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7373 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7374 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7375 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7376 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7377 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7378 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7379 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7380 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7381 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7382 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7385 Version 1.7.0 (2016-03-03)
7386 ==========================
7393 * [`Path::strip_prefix`] (renamed from relative_from)
7394 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7396 * [`Ipv4Addr::is_loopback`]
7397 * [`Ipv4Addr::is_private`]
7398 * [`Ipv4Addr::is_link_local`]
7399 * [`Ipv4Addr::is_multicast`]
7400 * [`Ipv4Addr::is_broadcast`]
7401 * [`Ipv4Addr::is_documentation`]
7403 * [`Ipv6Addr::is_unspecified`]
7404 * [`Ipv6Addr::is_loopback`]
7405 * [`Ipv6Addr::is_multicast`]
7408 * [`Vec::as_mut_slice`]
7410 * [`String::as_str`]
7411 * [`String::as_mut_str`]
7413 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7415 * `<[T]>::`[`sort_by_key`]
7416 * checked, saturated, and overflowing operations
7417 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7418 * [`i32::saturating_mul`]
7419 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7420 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7421 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7422 * [`u32::saturating_mul`]
7423 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7424 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7425 * and checked, saturated, and overflowing operations for other primitive types
7427 * [`ffi::IntoStringError`]
7428 * [`CString::into_string`]
7429 * [`CString::into_bytes`]
7430 * [`CString::into_bytes_with_nul`]
7431 * `From<CString> for Vec<u8>`
7433 * [`IntoStringError::into_cstring`]
7434 * [`IntoStringError::utf8_error`]
7435 * `Error for IntoStringError`
7437 * [`std::hash::BuildHasher`]
7438 * [`BuildHasher::Hasher`]
7439 * [`BuildHasher::build_hasher`]
7440 * [`std::hash::BuildHasherDefault`]
7441 * [`HashMap::with_hasher`]
7442 * [`HashMap::with_capacity_and_hasher`]
7443 * [`HashSet::with_hasher`]
7444 * [`HashSet::with_capacity_and_hasher`]
7445 * [`std::collections::hash_map::RandomState`]
7446 * [`RandomState::new`]
7447 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7448 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7449 from bytes is faster.
7450 * [The performance of `LineWriter` (and thus `io::stdout`) was
7451 improved by using `memchr` to search for newlines][1.7m].
7452 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7453 `f64` variants were stabilized previously.
7454 * [`BTreeMap` was rewritten to use less memory and improve the performance
7455 of insertion and iteration, the latter by as much as 5x][1.7bm].
7456 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7457 covariant over their contained type][1.7bt].
7458 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7459 over their contained type][1.7ll].
7460 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7462 * [`Any` is implemented for unsized types][1.7a].
7463 * [`Hash` is implemented for `Duration`][1.7h].
7468 * [When running tests with `--test`, rustdoc will pass `--cfg`
7469 arguments to the compiler][1.7dt].
7470 * [The compiler is built with RPATH information by default][1.7rpa].
7471 This means that it will be possible to run `rustc` when installed in
7472 unusual configurations without configuring the dynamic linker search
7474 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7475 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7476 over `LD_LIBRARY_PATH`.
7481 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7482 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7483 * [The `rerun-if-changed` build script directive no longer causes the
7484 build script to incorrectly run twice in certain scenarios][1.7rr].
7489 * Soundness fixes to the interactions between associated types and
7490 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7491 code that violates the new rules. This is a significant change that
7492 is known to break existing code, so it has emitted warnings for the
7493 new error cases since 1.4 to give crate authors time to adapt. The
7494 details of what is changing are subtle; read the RFC for more.
7495 * [Several bugs in the compiler's visibility calculations were
7496 fixed][1.7v]. Since this was found to break significant amounts of
7497 code, the new errors will be emitted as warnings for several release
7498 cycles, under the `private_in_public` lint.
7499 * Defaulted type parameters were accidentally accepted in positions
7500 that were not intended. In this release, [defaulted type parameters
7501 appearing outside of type definitions will generate a
7502 warning][1.7d], which will become an error in future releases.
7503 * [Parsing "." as a float results in an error instead of 0][1.7p].
7504 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7505 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7507 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7508 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7509 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7510 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7511 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7512 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7513 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7514 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7515 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7516 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7517 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7518 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7519 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7520 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7521 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7522 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7523 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7524 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7525 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7526 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7527 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7528 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7529 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7530 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7531 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7532 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7533 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7534 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7535 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7536 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7537 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7538 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7539 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7540 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7541 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7542 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7543 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7544 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7545 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7546 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7547 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7548 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7549 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7550 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7551 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7552 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7553 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7554 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7555 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7556 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7557 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7558 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7559 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7560 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7561 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7562 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7563 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7564 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7565 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7566 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7567 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7568 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7569 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7570 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7571 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7572 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7573 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7574 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7575 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7576 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7577 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7578 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7579 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7580 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7581 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7582 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7583 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7584 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7585 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7588 Version 1.6.0 (2016-01-21)
7589 ==========================
7594 * The `#![no_std]` attribute causes a crate to not be linked to the
7595 standard library, but only the [core library][1.6co], as described
7596 in [RFC 1184]. The core library defines common types and traits but
7597 has no platform dependencies whatsoever, and is the basis for Rust
7598 software in environments that cannot support a full port of the
7599 standard library, such as operating systems. Most of the core
7600 library is now stable.
7606 [`Read::read_exact`],
7607 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7608 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7609 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7610 [`os::unix::fs::DirBuilderExt`],
7611 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7612 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7613 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7614 [`collections::hash_map::Drain`],
7615 [`collections::hash_map::HashMap::drain`],
7616 [`collections::hash_set::Drain`],
7617 [`collections::hash_set::HashSet::drain`],
7618 [`collections::binary_heap::Drain`],
7619 [`collections::binary_heap::BinaryHeap::drain`],
7620 [`Vec::extend_from_slice`] (renamed from `push_all`),
7621 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7622 [`RwLock::into_inner`],
7623 [`Iterator::min_by_key`] (renamed from `min_by`),
7624 [`Iterator::max_by_key`] (renamed from `max_by`).
7625 * The [core library][1.6co] is stable, as are most of its APIs.
7626 * [The `assert_eq!` macro supports arguments that don't implement
7627 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7629 * Several timer functions that take duration in milliseconds [are
7630 deprecated in favor of those that take `Duration`][1.6ms]. These
7631 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7632 `thread::park_timeout_ms`.
7633 * The algorithm by which `Vec` reserves additional elements was
7634 [tweaked to not allocate excessive space][1.6a] while still growing
7636 * `From` conversions are [implemented from integers to floats][1.6f]
7637 in cases where the conversion is lossless. Thus they are not
7638 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7639 or `f64`. They are also not implemented for `isize` and `usize`
7640 because the implementations would be platform-specific. `From` is
7641 also implemented from `f32` to `f64`.
7642 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7643 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7644 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7645 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7647 * Sorting slices that are already sorted [is 50% faster in some
7653 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7654 * Cargo build scripts can specify their dependencies by emitting the
7655 [`rerun-if-changed`][1.6rr] key.
7656 * crates.io will reject publication of crates with dependencies that
7657 have a wildcard version constraint. Crates with wildcard
7658 dependencies were seen to cause a variety of problems, as described
7659 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7661 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7662 release folder. A variety of artifacts that Cargo failed to clean
7663 are now correctly deleted.
7668 * The `unreachable_code` lint [warns when a function call's argument
7670 * The parser indicates [failures that may be caused by
7671 confusingly-similar Unicode characters][1.6uc]
7672 * Certain macro errors [are reported at definition time][1.6m], not
7678 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7679 environment variable when locating crates. This was a pre-cargo
7680 feature for integrating with the package manager that was
7681 accidentally never removed.
7682 * [A number of bugs were fixed in the privacy checker][1.6p] that
7683 could cause previously-accepted code to break.
7684 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7685 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7686 struct pattern syntax (`Foo(..)`) can no longer be used to match
7687 unit structs. This is a warning now, but will become an error in
7688 future releases. Patterns that share the same name as a const are
7690 * A bug was fixed that causes [rustc not to apply default type
7691 parameters][1.6xc] when resolving certain method implementations of
7692 traits defined in other crates.
7694 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7695 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7696 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7697 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7698 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7699 [1.6co]: http://doc.rust-lang.org/core/index.html
7700 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7701 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7702 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7703 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7704 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7705 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7706 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7707 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7708 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7709 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7710 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7711 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7712 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7713 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7714 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7715 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7716 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7717 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7718 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7719 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7720 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7721 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7722 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7723 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7724 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7725 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7726 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7727 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7728 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7729 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7730 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7731 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7732 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7733 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7734 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7735 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7736 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7737 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7738 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7739 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7740 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7743 Version 1.5.0 (2015-12-10)
7744 ==========================
7746 * ~700 changes, numerous bugfixes
7752 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7753 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7754 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7755 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7756 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7757 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7758 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7759 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7760 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7761 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7762 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7763 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7764 [`Path::read_link`], [`Path::symlink_metadata`],
7765 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7766 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7767 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7768 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7769 [`slice::split_first_mut`], [`slice::split_first`],
7770 [`slice::split_last_mut`], [`slice::split_last`],
7771 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7772 [`str::MatchIndices`], [`str::RMatchIndices`],
7773 [`str::match_indices`], [`str::rmatch_indices`],
7774 [`str::slice_mut_unchecked`], [`string::ParseError`].
7775 * Rust applications hosted on crates.io can be installed locally to
7776 `~/.cargo/bin` with the [`cargo install`] command. Among other
7777 things this makes it easier to augment Cargo with new subcommands:
7778 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7779 invoked as `cargo foo`.
7780 * Crates with wildcard (`*`) dependencies will [emit warnings when
7781 published][1.5w]. In 1.6 it will no longer be possible to publish
7782 crates with wildcard dependencies.
7787 * The rules determining when a particular lifetime must outlive
7788 a particular value (known as '[dropck]') have been [modified
7789 to not rely on parametricity][1.5p].
7790 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7791 and `Arc`][1.5a]. Because these smart pointer types implement
7792 `Deref`, this causes breakage in cases where the interior type
7793 contains methods of the same name.
7794 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7795 that they could drop their content. Soundness fix.
7796 * All method invocations are [properly checked][1.5wf1] for
7797 [well-formedness][1.5wf2]. Soundness fix.
7798 * Traits whose supertraits contain `Self` are [not object
7799 safe][1.5o]. Soundness fix.
7800 * Target specifications support a [`no_default_libraries`][1.5nd]
7801 setting that controls whether `-nodefaultlibs` is passed to the
7802 linker, and in turn the `is_like_windows` setting no longer affects
7803 the `-nodefaultlibs` flag.
7804 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7805 * The `#[inline]` and `#[repr]` attributes [can only appear
7806 in valid locations][1.5at].
7807 * Native libraries linked from the local crate are [passed to
7808 the linker before native libraries from upstream crates][1.5nl].
7809 * Two rarely-used attributes, `#[no_debug]` and
7810 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7811 * Negation of unsigned integers, which has been a warning for
7812 several releases, [is now behind a feature gate and will
7813 generate errors][1.5nu].
7814 * The parser accidentally accepted visibility modifiers on
7815 enum variants, a bug [which has been fixed][1.5ev].
7816 * [A bug was fixed that allowed `use` statements to import unstable
7822 * When evaluating expressions at compile-time that are not
7823 compile-time constants (const-evaluating expressions in non-const
7824 contexts), incorrect code such as overlong bitshifts and arithmetic
7825 overflow will [generate a warning instead of an error][1.5ce],
7826 delaying the error until runtime. This will allow the
7827 const-evaluator to be expanded in the future backwards-compatibly.
7828 * The `improper_ctypes` lint [no longer warns about using `isize` and
7829 `usize` in FFI][1.5ict].
7834 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7836 * `Default` is [implemented for mutable slices][1.5d].
7837 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7838 * There are now `From` conversions [between floating point
7839 types][1.5f] where the conversions are lossless.
7840 * There are now `From` conversions [between integer types][1.5i] where
7841 the conversions are lossless.
7842 * [`fs::Metadata` implements `Clone`][1.5fs].
7843 * The `parse` method [accepts a leading "+" when parsing
7845 * [`AsMut` is implemented for `Vec`][1.5am].
7846 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7847 been optimized][1.5cf] and no longer rely on the default impl.
7848 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7849 `unsafe extern "C"` function types now [implement `Clone`,
7850 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7851 `fmt::Debug` for up to 12 arguments][1.5fp].
7852 * [Dropping `Vec`s is much faster in unoptimized builds when the
7853 element types don't implement `Drop`][1.5dv].
7854 * A bug that caused in incorrect behavior when [combining `VecDeque`
7855 with zero-sized types][1.5vdz] was resolved.
7856 * [`PartialOrd` for slices is faster][1.5po].
7861 * [Crate metadata size was reduced by 20%][1.5md].
7862 * [Improvements to code generation reduced the size of libcore by 3.3
7863 MB and rustc's memory usage by 18MB][1.5m].
7864 * [Improvements to deref translation increased performance in
7865 unoptimized builds][1.5dr].
7866 * Various errors in trait resolution [are deduplicated to only be
7867 reported once][1.5te].
7868 * Rust has preliminary [support for rumprun kernels][1.5rr].
7869 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7871 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7872 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7873 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7874 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7875 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7876 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7877 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7878 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7879 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7880 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7881 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7882 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7883 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7884 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7885 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7886 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7887 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7888 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7889 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7890 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7891 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7892 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7893 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7894 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7895 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7896 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7897 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7898 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7899 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7900 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7901 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7902 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7903 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7904 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7905 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7906 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7907 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7908 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7909 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7910 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7911 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7912 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7913 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7914 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7915 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7916 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7917 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7918 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7919 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7920 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7921 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7922 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7923 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7924 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7925 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7926 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7927 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7928 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7929 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7930 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7931 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7932 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7933 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7934 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7935 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7936 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7937 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7938 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7939 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7940 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7941 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7942 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7943 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7944 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7945 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7946 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7947 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7948 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7949 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7950 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7951 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7952 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7953 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7954 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7955 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7956 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7957 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7958 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7959 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7961 Version 1.4.0 (2015-10-29)
7962 ==========================
7964 * ~1200 changes, numerous bugfixes
7969 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7970 GNU) are now supported and recommended for use.
7975 * [Several changes have been made to fix type soundness and improve
7976 the behavior of associated types][sound]. See [RFC 1214]. Although
7977 we have mostly introduced these changes as warnings this release, to
7978 become errors next release, there are still some scenarios that will
7979 see immediate breakage.
7980 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7981 line breaks in addition to `\n`][crlf].
7982 * [Loans of `'static` lifetime extend to the end of a function][stat].
7983 * [`str::parse` no longer introduces avoidable rounding error when
7984 parsing floating point numbers. Together with earlier changes to
7985 float formatting/output, "round trips" like f.to_string().parse()
7986 now preserve the value of f exactly. Additionally, leading plus
7987 signs are now accepted][fp3].
7993 * `use` statements that import multiple items [can now rename
7994 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7995 * [Binops work correctly on fat pointers][binfat].
7996 * `pub extern crate`, which does not behave as expected, [issues a
7997 warning][pec] until a better solution is found.
8002 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8003 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8004 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8005 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8006 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8007 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8008 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8009 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8010 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8011 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8012 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8013 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8014 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8015 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8016 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8017 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8018 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8019 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8021 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8022 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8023 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8024 `f64::from_str_radix`.
8025 * [Reverse-searching strings is faster with the 'two-way'
8027 * [`std::io::copy` allows `?Sized` arguments][cc].
8028 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8029 [override `count`, `nth` and `last` with an O(1)
8030 implementation][it].
8031 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8032 * [`IntoRawFd` has been added to the Unix-specific prelude,
8033 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8035 * [`Extend<String>` and `FromIterator<String` are both implemented for
8037 * [`IntoIterator` is implemented for references to `Option` and
8039 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8040 Copy`][ext] as part of [RFC 839]. This will cause type inference
8041 breakage in rare situations.
8042 * [`BinaryHeap` implements `Debug`][bh2].
8043 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8045 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8046 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8047 * [String comparison is faster][faststr].
8048 * `&mut T` where `T: std::fmt::Write` [also implements
8049 `std::fmt::Write`][mutw].
8050 * [A stable regression in `VecDeque::push_back` and other
8051 capacity-altering methods that caused panics for zero-sized types
8053 * [Function pointers implement traits for up to 12 parameters][fp2].
8058 * The compiler [no longer uses the 'morestack' feature to prevent
8059 stack overflow][mm]. Instead it uses guard pages and stack
8060 probes (though stack probes are not yet implemented on any platform
8062 * [The compiler matches traits faster when projections are involved][p].
8063 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8065 * [Cargo now displays useful information about what its doing during
8066 `cargo update`][cu].
8068 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8069 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8070 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8071 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8072 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8073 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8074 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8075 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8076 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8077 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8078 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8079 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8080 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8081 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8082 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8083 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8084 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8085 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8086 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8087 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8088 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8089 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8090 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8091 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8092 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8093 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8094 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8095 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8096 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8097 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8098 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8099 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8100 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8101 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8102 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8103 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8104 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8105 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8106 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8107 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8108 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8109 [bh2]: https://github.com/rust-lang/rust/pull/28156
8110 [binfat]: https://github.com/rust-lang/rust/pull/28270
8111 [bm]: https://github.com/rust-lang/rust/pull/28197
8112 [cc]: https://github.com/rust-lang/rust/pull/27531
8113 [crlf]: https://github.com/rust-lang/rust/pull/28034
8114 [cu]: https://github.com/rust-lang/cargo/pull/1931
8115 [d]: https://github.com/rust-lang/rust/pull/27825
8116 [dep]: https://github.com/rust-lang/rust/pull/28339
8117 [es]: https://github.com/rust-lang/rust/pull/27956
8118 [ext]: https://github.com/rust-lang/rust/pull/28094
8119 [faststr]: https://github.com/rust-lang/rust/pull/28338
8120 [ffi]: https://github.com/rust-lang/rust/pull/28779
8121 [fp]: https://github.com/rust-lang/rust/pull/28268
8122 [fp2]: https://github.com/rust-lang/rust/pull/28560
8123 [fp3]: https://github.com/rust-lang/rust/pull/27307
8124 [i]: https://github.com/rust-lang/rust/pull/27451
8125 [into2]: https://github.com/rust-lang/rust/pull/28039
8126 [it]: https://github.com/rust-lang/rust/pull/27652
8127 [mm]: https://github.com/rust-lang/rust/pull/27338
8128 [mutw]: https://github.com/rust-lang/rust/pull/28368
8129 [sound]: https://github.com/rust-lang/rust/pull/27641
8130 [p]: https://github.com/rust-lang/rust/pull/27866
8131 [pec]: https://github.com/rust-lang/rust/pull/28486
8132 [pr]: https://github.com/rust-lang/rust/pull/27896
8133 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8134 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8135 [s]: https://github.com/rust-lang/rust/pull/27474
8136 [stab]: https://github.com/rust-lang/rust/pull/28339
8137 [stat]: https://github.com/rust-lang/rust/pull/28321
8138 [vd]: https://github.com/rust-lang/rust/pull/28494
8140 Version 1.3.0 (2015-09-17)
8141 ==============================
8143 * ~900 changes, numerous bugfixes
8148 * The [new object lifetime defaults][nold] have been [turned
8149 on][nold2] after a cycle of warnings about the change. Now types
8150 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8151 being interpreted as `&'a Box<Trait+'a>` to `&'a
8152 Box<Trait+'static>`.
8153 * [The Rustonomicon][nom] is a new book in the official documentation
8154 that dives into writing unsafe Rust.
8155 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8156 timekeeping is employed by other std APIs, as well as out-of-tree
8162 * The [new object lifetime defaults][nold] have been [turned
8163 on][nold2] after a cycle of warnings about the change.
8164 * There is a known [regression][lr] in how object lifetime elision is
8165 interpreted, the proper solution for which is undetermined.
8166 * The `#[prelude_import]` attribute, an internal implementation
8167 detail, was accidentally stabilized previously. [It has been put
8168 behind the `prelude_import` feature gate][pi]. This change is
8169 believed to break no existing code.
8170 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8171 [more sane for dynamically sized types][dst3]. Code that relied on
8172 the previous behavior is thought to be broken.
8173 * The `dropck` rules, which checks that destructors can't access
8174 destroyed values, [have been updated][dropck] to match the
8175 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8176 cause some previously-compiling code to no longer build.
8181 * The [new object lifetime defaults][nold] have been [turned
8182 on][nold2] after a cycle of warnings about the change.
8183 * Semicolons may [now follow types and paths in
8184 macros](https://github.com/rust-lang/rust/pull/27000).
8185 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8186 [more sane for dynamically sized types][dst3]. Code that relied on
8187 the previous behavior is not known to exist, and suspected to be
8189 * `'static` variables [may now be recursive][st].
8190 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8191 implementations correctly.
8192 * The `dropck` rules, which checks that destructors can't access
8193 destroyed values, [have been updated][dropck] to match the
8199 * The [`Duration`] API, [has been stabilized][ds], as well as the
8200 `std::time` module, which presently contains only `Duration`.
8201 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8202 * The owned C string, [`CString`], implements [`Borrow`] and the
8203 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8204 these allow C strings to be borrowed and cloned in generic code.
8205 * [`CStr`] implements [`Debug`].
8206 * [`AtomicPtr`] implements [`Debug`].
8207 * [`Error`] trait objects [can be downcast to their concrete types][e]
8208 in many common configurations, using the [`is`], [`downcast`],
8209 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8211 * Searching for substrings now [employs the two-way algorithm][search]
8212 instead of doing a naive search. This gives major speedups to a
8213 number of methods, including [`contains`][sc], [`find`][sf],
8214 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8215 [`ends_with`][sew] are also faster.
8216 * The performance of `PartialEq` for slices is [much faster][ps].
8217 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8218 is overridden and optimized by the implementations for scalars.
8219 * The [`Hasher`] trait now has a number of specialized `write_*`
8220 methods for primitive types, for efficiency.
8221 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8222 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8223 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8224 of [`std::error::Error::cause`][iec] also delegates to the inner
8226 * [`process::Child`][pc] gained the [`id`] method, which returns a
8227 `u32` representing the platform-specific process identifier.
8228 * The [`connect`] method on slices is deprecated, replaced by the new
8229 [`join`] method (note that both of these are on the *unstable*
8230 [`SliceConcatExt`] trait, but through the magic of the prelude are
8231 available to stable code anyway).
8232 * The [`Div`] operator is implemented for [`Wrapping`] types.
8233 * [`DerefMut` is implemented for `String`][dms].
8234 * Performance of SipHash (the default hasher for `HashMap`) is
8235 [better for long data][sh].
8236 * [`AtomicPtr`] implements [`Send`].
8237 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8238 are now [specialized to use uninitialized buffers for increased
8240 * Lifetime parameters of foreign functions [are now resolved
8246 * Rust can now, with some coercion, [produce programs that run on
8247 Windows XP][xp], though XP is not considered a supported platform.
8248 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8249 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8250 recommended for use in 1.3, though should be fully-functional
8251 in the [64-bit 1.4 beta][b14].
8252 * On Fedora-based systems installation will [properly configure the
8253 dynamic linker][fl].
8254 * The compiler gained many new extended error descriptions, which can
8255 be accessed with the `--explain` flag.
8256 * The `dropck` pass, which checks that destructors can't access
8257 destroyed values, [has been rewritten][dropck]. This fixes some
8258 soundness holes, and as such will cause some previously-compiling
8259 code to no longer build.
8260 * `rustc` now uses [LLVM to write archive files where possible][ar].
8261 Eventually this will eliminate the compiler's dependency on the ar
8263 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8264 supported FreeBSD on x86_64).
8265 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8266 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8268 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8269 will kill the process instead of leaking][nlp].
8271 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8272 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8273 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8274 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8275 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8276 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8277 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8278 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8279 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8280 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8281 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8282 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8283 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8284 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8285 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8286 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8287 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8288 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8289 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8290 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8291 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8292 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8293 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8294 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8295 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8296 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8297 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8298 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8299 [ar]: https://github.com/rust-lang/rust/pull/26926
8300 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8301 [dms]: https://github.com/rust-lang/rust/pull/26241
8302 [dropck]: https://github.com/rust-lang/rust/pull/27261
8303 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8304 [ds]: https://github.com/rust-lang/rust/pull/26818
8305 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8306 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8307 [dst3]: https://github.com/rust-lang/rust/pull/27351
8308 [e]: https://github.com/rust-lang/rust/pull/24793
8309 [f]: https://github.com/rust-lang/rust/pull/26588
8310 [fb]: https://github.com/rust-lang/rust/pull/26959
8311 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8312 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8313 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8314 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8315 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8316 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8317 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8318 [lic]: https://github.com/rust-lang/rust/pull/26583
8319 [lnu]: https://github.com/rust-lang/rust/pull/27026
8320 [lr]: https://github.com/rust-lang/rust/issues/27248
8321 [lum]: https://github.com/rust-lang/rust/pull/26378
8322 [lur]: https://github.com/rust-lang/rust/pull/26783
8323 [nlp]: https://github.com/rust-lang/rust/pull/27176
8324 [nold2]: https://github.com/rust-lang/rust/pull/27045
8325 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8326 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8327 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8328 [pi]: https://github.com/rust-lang/rust/pull/26699
8329 [ps]: https://github.com/rust-lang/rust/pull/26884
8330 [rte]: https://github.com/rust-lang/rust/pull/26950
8331 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8332 [search]: https://github.com/rust-lang/rust/pull/26327
8333 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8334 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8335 [sh]: https://github.com/rust-lang/rust/pull/27280
8336 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8337 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8338 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8339 [st]: https://github.com/rust-lang/rust/pull/26630
8340 [win1]: https://github.com/rust-lang/rust/pull/26569
8341 [win2]: https://github.com/rust-lang/rust/pull/26741
8342 [win3]: https://github.com/rust-lang/rust/pull/26741
8343 [win4]: https://github.com/rust-lang/rust/pull/27210
8344 [xp]: https://github.com/rust-lang/rust/pull/26569
8346 Version 1.2.0 (2015-08-07)
8347 ==========================
8349 * ~1200 changes, numerous bugfixes
8354 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8355 like `Rc` to contain types without a fixed size, arrays and trait
8356 objects, finally enabling use of `Rc<[T]>` and completing the
8357 implementation of DST.
8358 * [Parallel codegen][parcodegen] is now working again, which can
8359 substantially speed up large builds in debug mode; It also gets
8360 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8361 jobs). It's not enabled by default, but will be "in the near
8362 future". It can be activated with the `-C codegen-units=N` flag to
8364 * This is the first release with [experimental support for linking
8365 with the MSVC linker and lib C on Windows (instead of using the GNU
8366 variants via MinGW)][win]. It is yet recommended only for the most
8367 intrepid Rustaceans.
8368 * Benchmark compilations are showing a 30% improvement in
8369 bootstrapping over 1.1.
8374 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8375 unicode case mapping, which is a previously-planned change in
8376 behavior and considered a bugfix.
8377 * [`mem::align_of`] now specifies [the *minimum alignment* for
8378 T][align], which is usually the alignment programs are interested
8379 in, and the same value reported by clang's
8380 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8382 * [The `#[packed]` attribute is no longer silently accepted by the
8383 compiler][packed]. This attribute did nothing and code that
8384 mentioned it likely did not work as intended.
8385 * Associated type defaults are [now behind the
8386 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8387 defaults *did not work*, but could be mentioned syntactically. As
8388 such this breakage has minimal impact.
8393 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8394 matching against dereferenceable values.
8399 * The [`Extend`] trait, which grows a collection from an iterator, is
8400 implemented over iterators of references, for `String`, `Vec`,
8401 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8402 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8403 * The [`iter::once`] function returns an iterator that yields a single
8404 element, and [`iter::empty`] returns an iterator that yields no
8406 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8407 over substring matches.
8408 * [`Cell`] and [`RefCell`] both implement `Eq`.
8409 * A number of methods for wrapping arithmetic are added to the
8410 integral types, [`wrapping_div`], [`wrapping_rem`],
8411 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8412 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8413 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8414 type.. It is illegal for the default arithmetic operations in Rust
8415 to overflow; the desire to wrap must be explicit.
8416 * The `{:#?}` formatting specifier [displays the alternate,
8417 pretty-printed][debugfmt] form of the `Debug` formatter. This
8418 feature was actually introduced prior to 1.0 with little
8420 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8421 for writing data to formatted strings, similar to [`io::Write`].
8422 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8423 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8424 are used by code generators to emit implementations of [`Debug`].
8425 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8426 methods that convert case, following Unicode case mapping.
8427 * It is now easier to handle poisoned locks. The [`PoisonError`]
8428 type, returned by failing lock operations, exposes `into_inner`,
8429 `get_ref`, and `get_mut`, which all give access to the inner lock
8430 guard, and allow the poisoned lock to continue to operate. The
8431 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8432 poisoned lock without attempting to take the lock.
8433 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8434 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8435 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8436 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8438 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8444 * `rustc` employs smarter heuristics for guessing at [typos].
8445 * `rustc` emits more efficient code for [no-op conversions between
8446 unsafe pointers][nop].
8447 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8448 resulting in faster compile times and smaller code.
8450 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8451 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8452 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8453 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8454 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8455 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8456 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8457 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8458 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8459 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8460 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8461 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8462 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8463 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8464 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8465 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8466 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8467 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8468 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8469 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8470 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8471 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8472 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8473 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8474 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8475 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8476 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8477 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8478 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8479 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8480 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8481 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8482 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8483 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8484 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8485 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8486 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8487 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8488 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8489 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8490 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8491 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8492 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8493 [align]: https://github.com/rust-lang/rust/pull/25646
8494 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8495 [typos]: https://github.com/rust-lang/rust/pull/26087
8496 [nop]: https://github.com/rust-lang/rust/pull/26336
8497 [fat]: https://github.com/rust-lang/rust/pull/26411
8498 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8499 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8500 [packed]: https://github.com/rust-lang/rust/pull/25541
8501 [ad]: https://github.com/rust-lang/rust/pull/27382
8502 [win]: https://github.com/rust-lang/rust/pull/25350
8504 Version 1.1.0 (2015-06-25)
8505 =========================
8507 * ~850 changes, numerous bugfixes
8512 * The [`std::fs` module has been expanded][fs] to expand the set of
8513 functionality exposed:
8514 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8515 don't incur a syscall on some platforms.
8516 * A `symlink_metadata` function has been added.
8517 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8518 access to all underlying information.
8519 * The compiler now contains extended explanations of many errors. When an error
8520 with an explanation occurs the compiler suggests using the `--explain` flag
8521 to read the explanation. Error explanations are also [available online][err-index].
8522 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8523 well as other work, the time to bootstrap the compiler decreased by
8529 * The [`str::split_whitespace`] method splits a string on unicode
8530 whitespace boundaries.
8531 * On both Windows and Unix, new extension traits provide conversion of
8532 I/O types to and from the underlying system handles. On Unix, these
8533 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8534 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8535 `TcpListener`, and `UpdSocket`. Further implementations for
8536 `std::process` will be stabilized later.
8537 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8538 Windows, symlinks can be created with
8539 `std::os::windows::symlink_dir` and
8540 `std::os::windows::symlink_file`.
8541 * The `mpsc::Receiver` type can now be converted into an iterator with
8542 `into_iter` on the [`IntoIterator`] trait.
8543 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8544 implementation of the [`From`] trait.
8545 * The `Debug` implementation for `RangeFull` [creates output that is
8546 more consistent with other implementations][rf].
8547 * [`Debug` is implemented for `File`][file].
8548 * The `Default` implementation for `Arc` [no longer requires `Sync +
8550 * [The `Iterator` methods `count`, `nth`, and `last` have been
8551 overridden for slices to have O(1) performance instead of O(n)][si].
8552 * Incorrect handling of paths on Windows has been improved in both the
8553 compiler and the standard library.
8554 * [`AtomicPtr` gained a `Default` implementation][ap].
8555 * In accordance with Rust's policy on arithmetic overflow `abs` now
8556 [panics on overflow when debug assertions are enabled][abs].
8557 * The [`Cloned`] iterator, which was accidentally left unstable for
8558 1.0 [has been stabilized][c].
8559 * The [`Incoming`] iterator, which iterates over incoming TCP
8560 connections, and which was accidentally unnamable in 1.0, [is now
8561 properly exported][inc].
8562 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8563 `sift_up` or `sift_down` panic][bh].
8564 * The [`split_off`] method of `LinkedList` [no longer corrupts
8565 the list in certain scenarios][ll].
8570 * Type checking performance [has improved notably][sk] with
8571 [multiple improvements][pre].
8572 * The compiler [suggests code changes][ch] for more errors.
8573 * rustc and it's build system have experimental support for [building
8574 toolchains against MUSL][m] instead of glibc on Linux.
8575 * The compiler defines the `target_env` cfg value, which is used for
8576 distinguishing toolchains that are otherwise for the same
8577 platform. Presently this is set to `gnu` for common GNU Linux
8578 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8579 * The [`cargo rustc`][crc] command invokes a build with custom flags
8581 * [Android executables are always position independent][pie].
8582 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8585 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8586 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8587 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8588 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8589 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8590 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8591 [rf]: https://github.com/rust-lang/rust/pull/24491
8592 [err-index]: https://doc.rust-lang.org/error-index.html
8593 [sk]: https://github.com/rust-lang/rust/pull/24615
8594 [pre]: https://github.com/rust-lang/rust/pull/25323
8595 [file]: https://github.com/rust-lang/rust/pull/24598
8596 [ch]: https://github.com/rust-lang/rust/pull/24683
8597 [arc]: https://github.com/rust-lang/rust/pull/24695
8598 [si]: https://github.com/rust-lang/rust/pull/24701
8599 [ap]: https://github.com/rust-lang/rust/pull/24834
8600 [m]: https://github.com/rust-lang/rust/pull/24777
8601 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8602 [crc]: https://github.com/rust-lang/cargo/pull/1568
8603 [pie]: https://github.com/rust-lang/rust/pull/24953
8604 [abs]: https://github.com/rust-lang/rust/pull/25441
8605 [c]: https://github.com/rust-lang/rust/pull/25496
8606 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8607 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8608 [inc]: https://github.com/rust-lang/rust/pull/25522
8609 [bh]: https://github.com/rust-lang/rust/pull/25856
8610 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8611 [ll]: https://github.com/rust-lang/rust/pull/26022
8612 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8613 [drop]: https://github.com/rust-lang/rust/pull/24935
8615 Version 1.0.0 (2015-05-15)
8616 ========================
8618 * ~1500 changes, numerous bugfixes
8623 * The vast majority of the standard library is now `#[stable]`. It is
8624 no longer possible to use unstable features with a stable build of
8626 * Many popular crates on [crates.io] now work on the stable release
8628 * Arithmetic on basic integer types now [checks for overflow in debug
8634 * Several [restrictions have been added to trait coherence][coh] in
8635 order to make it easier for upstream authors to change traits
8636 without breaking downstream code.
8637 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8638 improve error messages and macro behavior. For example, `0b1234` is
8639 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8640 * Trait bounds [are always invariant][inv], eliminating the need for
8641 the `PhantomFn` and `MarkerTrait` lang items, which have been
8643 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8644 "foo" as bar` syntax has been replaced with `extern crate foo as
8645 bar`, and Cargo now automatically translates "-" in *package* names
8646 to underscore for the crate name.
8647 * [Lifetime shadowing is an error][lt].
8648 * [`Send` no longer implies `'static`][send-rfc].
8649 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8650 `MyType::default()`.
8651 * Primitive types [now have inherent methods][prim-inherent],
8652 obviating the need for extension traits like `SliceExt`.
8653 * Methods with `Self: Sized` in their `where` clause are [considered
8654 object-safe][self-sized], allowing many extension traits like
8655 `IteratorExt` to be merged into the traits they extended.
8656 * You can now [refer to associated types][assoc-where] whose
8657 corresponding trait bounds appear only in a `where` clause.
8658 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8659 like `Send` and `Sync` are now library-defined.
8660 * A [Reflect trait][reflect] was introduced, which means that
8661 downcasting via the `Any` trait is effectively limited to concrete
8662 types. This helps retain the potentially-important "parametricity"
8663 property: generic code cannot behave differently for different type
8664 arguments except in minor ways.
8665 * The `unsafe_destructor` feature is now deprecated in favor of the
8666 [new `dropck`][dropck]. This change is a major reduction in unsafe
8672 * The `thread_local` module [has been renamed to `std::thread`][th].
8673 * The methods of `IteratorExt` [have been moved to the `Iterator`
8675 * Several traits that implement Rust's conventions for type
8676 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8677 [centralized in the `std::convert` module][con].
8678 * The `FromError` trait [was removed in favor of `From`][fe].
8679 * The basic sleep function [has moved to
8680 `std::thread::sleep_ms`][slp].
8681 * The `splitn` function now takes an `n` parameter that represents the
8682 number of items yielded by the returned iterator [instead of the
8683 number of 'splits'][spl].
8684 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8685 * [Derived implementations of `PartialOrd` now order enums according
8686 to their explicitly-assigned discriminants][po].
8687 * [Methods for searching strings are generic over `Pattern`s][pat],
8688 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8690 * [In method resolution, object methods are resolved before inherent
8692 * [`String::from_str` has been deprecated in favor of the `From` impl,
8693 `String::from`][sf].
8694 * [`io::Error` implements `Sync`][ios].
8695 * [The `words` method on `&str` has been replaced with
8696 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8698 * The new path and IO modules are complete and `#[stable]`. This
8699 was the major library focus for this cycle.
8700 * The path API was [revised][path-normalize] to normalize `.`,
8701 adjusting the tradeoffs in favor of the most common usage.
8702 * A large number of remaining APIs in `std` were also stabilized
8703 during this cycle; about 75% of the non-deprecated API surface
8705 * The new [string pattern API][string-pattern] landed, which makes
8706 the string slice API much more internally consistent and flexible.
8707 * A new set of [generic conversion traits][conversion] replaced
8708 many existing ad hoc traits.
8709 * Generic numeric traits were [completely removed][num-traits]. This
8710 was made possible thanks to inherent methods for primitive types,
8711 and the removal gives maximal flexibility for designing a numeric
8712 hierarchy in the future.
8713 * The `Fn` traits are now related via [inheritance][fn-inherit]
8714 and provide ergonomic [blanket implementations][fn-blanket].
8715 * The `Index` and `IndexMut` traits were changed to
8716 [take the index by value][index-value], enabling code like
8717 `hash_map["string"]` to work.
8718 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8719 `Copy` data is known to be `Clone` as well.
8724 * Many errors now have extended explanations that can be accessed with
8725 the `--explain` flag to `rustc`.
8726 * Many new examples have been added to the standard library
8728 * rustdoc has received a number of improvements focused on completion
8730 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8731 * Much headway was made on ecosystem-wide CI, making it possible
8732 to [compare builds for breakage][ci-compare].
8735 [crates.io]: http://crates.io
8736 [clo]: https://github.com/rust-lang/rust/pull/24034
8737 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8738 [con]: https://github.com/rust-lang/rust/pull/23875
8739 [cr]: https://github.com/rust-lang/rust/pull/23419
8740 [fe]: https://github.com/rust-lang/rust/pull/23879
8741 [ie]: https://github.com/rust-lang/rust/pull/23300
8742 [inv]: https://github.com/rust-lang/rust/pull/23938
8743 [ios]: https://github.com/rust-lang/rust/pull/24133
8744 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8745 [lt]: https://github.com/rust-lang/rust/pull/24057
8746 [meth]: https://github.com/rust-lang/rust/pull/24056
8747 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8748 [po]: https://github.com/rust-lang/rust/pull/24270
8749 [sf]: https://github.com/rust-lang/rust/pull/24517
8750 [slp]: https://github.com/rust-lang/rust/pull/23949
8751 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8752 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8753 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8754 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8755 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8756 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8757 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8758 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8759 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8760 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8761 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8762 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8763 [reflect]: https://github.com/rust-lang/rust/pull/23712
8764 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8765 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8766 [index-value]: https://github.com/rust-lang/rust/pull/23601
8767 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8768 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8769 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8770 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8771 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8772 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8775 Version 1.0.0-alpha.2 (2015-02-20)
8776 =====================================
8778 * ~1300 changes, numerous bugfixes
8782 * The various I/O modules were [overhauled][io-rfc] to reduce
8783 unnecessary abstractions and provide better interoperation with
8784 the underlying platform. The old `io` module remains temporarily
8786 * The standard library now [participates in feature gating][feat],
8787 so use of unstable libraries now requires a `#![feature(...)]`
8788 attribute. The impact of this change is [described on the
8789 forum][feat-forum]. [RFC][feat-rfc].
8793 * `for` loops [now operate on the `IntoIterator` trait][into],
8794 which eliminates the need to call `.iter()`, etc. to iterate
8795 over collections. There are some new subtleties to remember
8796 though regarding what sort of iterators various types yield, in
8797 particular that `for foo in bar { }` yields values from a move
8798 iterator, destroying the original collection. [RFC][into-rfc].
8799 * Objects now have [default lifetime bounds][obj], so you don't
8800 have to write `Box<Trait+'static>` when you don't care about
8801 storing references. [RFC][obj-rfc].
8802 * In types that implement `Drop`, [lifetimes must outlive the
8803 value][drop]. This will soon make it possible to safely
8804 implement `Drop` for types where `#[unsafe_destructor]` is now
8805 required. Read the [gorgeous RFC][drop-rfc] for details.
8806 * The fully qualified <T as Trait>::X syntax lets you set the Self
8807 type for a trait method or associated type. [RFC][ufcs-rfc].
8808 * References to types that implement `Deref<U>` now [automatically
8809 coerce to references][deref] to the dereferenced type `U`,
8810 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8811 should eliminate many unsightly uses of `&*`, as when converting
8812 from references to vectors into references to
8813 slices. [RFC][deref-rfc].
8814 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8815 `|:|`) is obsolete and closure kind is inferred from context.
8816 * [`Self` is a keyword][Self].
8820 * The `Show` and `String` formatting traits [have been
8821 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8822 their related purposes. Automatically getting a string
8823 conversion to use with `format!("{:?}", something_to_debug)` is
8824 now written `#[derive(Debug)]`.
8825 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8826 OsStr}`, provide strings in platform-specific encodings for easier
8827 interop with system APIs. [RFC][osstr-rfc].
8828 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8829 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8830 creating raw pointers.
8834 * Certain long error messages of the form 'expected foo found bar'
8835 are now [split neatly across multiple
8836 lines][multiline]. Examples in the PR.
8837 * On Unix Rust can be [uninstalled][un] by running
8838 `/usr/local/lib/rustlib/uninstall.sh`.
8839 * The `#[rustc_on_unimplemented]` attribute, requiring the
8840 'on_unimplemented' feature, lets rustc [display custom error
8841 messages when a trait is expected to be implemented for a type
8846 * Rust is tested against a [LALR grammar][lalr], which parses
8847 almost all the Rust files that rustc does.
8849 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8850 [close]: https://github.com/rust-lang/rust/pull/21843
8851 [deref]: https://github.com/rust-lang/rust/pull/21351
8852 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8853 [drop]: https://github.com/rust-lang/rust/pull/21972
8854 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8855 [feat]: https://github.com/rust-lang/rust/pull/21248
8856 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8857 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8858 [fmt]: https://github.com/rust-lang/rust/pull/21457
8859 [into]: https://github.com/rust-lang/rust/pull/20790
8860 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8861 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8862 [lalr]: https://github.com/rust-lang/rust/pull/21452
8863 [multiline]: https://github.com/rust-lang/rust/pull/19870
8864 [obj]: https://github.com/rust-lang/rust/pull/22230
8865 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8866 [onun]: https://github.com/rust-lang/rust/pull/20889
8867 [osstr]: https://github.com/rust-lang/rust/pull/21488
8868 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8869 [Self]: https://github.com/rust-lang/rust/pull/22158
8870 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8871 [un]: https://github.com/rust-lang/rust/pull/22256
8874 Version 1.0.0-alpha (2015-01-09)
8875 ==================================
8877 * ~2400 changes, numerous bugfixes
8881 * The language itself is considered feature complete for 1.0,
8882 though there will be many usability improvements and bugfixes
8883 before the final release.
8884 * Nearly 50% of the public API surface of the standard library has
8885 been declared 'stable'. Those interfaces are unlikely to change
8887 * The long-running debate over integer types has been
8888 [settled][ints]: Rust will ship with types named `isize` and
8889 `usize`, rather than `int` and `uint`, for pointer-sized
8890 integers. Guidelines will be rolled out during the alpha cycle.
8891 * Most crates that are not `std` have been moved out of the Rust
8892 distribution into the Cargo ecosystem so they can evolve
8893 separately and don't need to be stabilized as quickly, including
8894 'time', 'getopts', 'num', 'regex', and 'term'.
8895 * Documentation continues to be expanded with more API coverage, more
8896 examples, and more in-depth explanations. The guides have been
8897 consolidated into [The Rust Programming Language][trpl].
8898 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8899 * All official Rust binary installers now come with [Cargo], the
8900 Rust package manager.
8904 * Closures have been [completely redesigned][unboxed] to be
8905 implemented in terms of traits, can now be used as generic type
8906 bounds and thus monomorphized and inlined, or via an opaque
8907 pointer (boxed) as in the old system. The new system is often
8908 referred to as 'unboxed' closures.
8909 * Traits now support [associated types][assoc], allowing families
8910 of related types to be defined together and used generically in
8912 * Enum variants are [namespaced by their type names][enum].
8913 * [`where` clauses][where] provide a more versatile and attractive
8914 syntax for specifying generic bounds, though the previous syntax
8916 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8918 * Rust [no longer has a runtime][rt] of any description, and only
8919 supports OS threads, not green threads.
8920 * At long last, Rust has been overhauled for 'dynamically-sized
8921 types' ([DST]), which integrates 'fat pointers' (object types,
8922 arrays, and `str`) more deeply into the type system, making it
8924 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8925 `..j` that produce range types and which, when combined with the
8926 `Index` operator and multidispatch, leads to a convenient slice
8928 * The new range syntax revealed an ambiguity in the fixed-length
8929 array syntax, so now fixed length arrays [are written `[T;
8931 * The `Copy` trait is no longer implemented automatically. Unsafe
8932 pointers no longer implement `Sync` and `Send` so types
8933 containing them don't automatically either. `Sync` and `Send`
8934 are now 'unsafe traits' so one can "forcibly" implement them via
8935 `unsafe impl` if a type confirms to the requirements for them
8936 even though the internals do not (e.g. structs containing unsafe
8937 pointers like `Arc`). These changes are intended to prevent some
8938 footguns and are collectively known as [opt-in built-in
8939 traits][oibit] (though `Sync` and `Send` will soon become pure
8940 library types unknown to the compiler).
8941 * Operator traits now take their operands [by value][ops], and
8942 comparison traits can use multidispatch to compare one type
8943 against multiple other types, allowing e.g. `String` to be
8944 compared with `&str`.
8945 * `if let` and `while let` are no longer feature-gated.
8946 * Rust has adopted a more [uniform syntax for escaping unicode
8947 characters][unicode].
8948 * `macro_rules!` [has been declared stable][mac]. Though it is a
8949 flawed system it is sufficiently popular that it must be usable
8950 for 1.0. Effort has gone into [future-proofing][mac-future] it
8951 in ways that will allow other macro systems to be developed in
8952 parallel, and won't otherwise impact the evolution of the
8954 * The prelude has been [pared back significantly][prelude] such
8955 that it is the minimum necessary to support the most pervasive
8956 code patterns, and through [generalized where clauses][where]
8957 many of the prelude extension traits have been consolidated.
8958 * Rust's rudimentary reflection [has been removed][refl], as it
8959 incurred too much code generation for little benefit.
8960 * [Struct variants][structvars] are no longer feature-gated.
8961 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8962 known as 'higher-ranked trait bounds', this crucially allows
8963 unboxed closures to work.
8964 * Macros invocations surrounded by parens or square brackets and
8965 not terminated by a semicolon are [parsed as
8966 expressions][macros], which makes expressions like `vec![1i32,
8967 2, 3].len()` work as expected.
8968 * Trait objects now implement their traits automatically, and
8969 traits that can be coerced to objects now must be [object
8971 * Automatically deriving traits is now done with `#[derive(...)]`
8972 not `#[deriving(...)]` for [consistency with other naming
8973 conventions][derive].
8974 * Importing the containing module or enum at the same time as
8975 items or variants they contain is [now done with `self` instead
8976 of `mod`][self], as in use `foo::{self, bar}`
8977 * Glob imports are no longer feature-gated.
8978 * The `box` operator and `box` patterns have been feature-gated
8979 pending a redesign. For now unique boxes should be allocated
8980 like other containers, with `Box::new`.
8984 * A [series][coll1] of [efforts][coll2] to establish
8985 [conventions][coll3] for collections types has resulted in API
8986 improvements throughout the standard library.
8987 * New [APIs for error handling][err] provide ergonomic interop
8988 between error types, and [new conventions][err-conv] describe
8989 more clearly the recommended error handling strategies in Rust.
8990 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8991 it is easier to discuss failure in the context of error handling
8992 without making clarifications as to whether you are referring to
8993 the 'fail' macro or failure more generally.
8994 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8995 syscall when available.
8996 * The 'serialize' crate has been renamed 'rustc-serialize' and
8997 moved out of the distribution to Cargo. Although it is widely
8998 used now, it is expected to be superseded in the near future.
8999 * The `Show` formatter, typically implemented with
9000 `#[derive(Show)]` is [now requested with the `{:?}`
9001 specifier][show] and is intended for use by all types, for uses
9002 such as `println!` debugging. The new `String` formatter must be
9003 implemented by hand, uses the `{}` specifier, and is intended
9004 for full-fidelity conversions of things that can logically be
9005 represented as strings.
9009 * [Flexible target specification][flex] allows rustc's code
9010 generation to be configured to support otherwise-unsupported
9012 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9013 respective debuggers with Rust-appropriate pretty-printing.
9014 * The Windows installation of Rust is distributed with the
9015 MinGW components currently required to link binaries on that
9020 * Nullable enum optimizations have been extended to more types so
9021 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9022 space than the inner types themselves.
9023 * Work has begun on supporting AArch64.
9025 [Cargo]: https://crates.io
9026 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9027 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9028 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9029 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9030 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9031 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9032 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9033 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9034 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9035 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9036 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9037 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9038 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9039 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9040 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9041 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9042 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9043 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9044 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9045 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9046 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9047 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9048 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9049 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9050 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9051 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9052 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9053 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9054 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9055 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9056 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9057 [trpl]: https://doc.rust-lang.org/book/index.html
9058 [rbe]: http://rustbyexample.com/
9061 Version 0.12.0 (2014-10-09)
9062 =============================
9064 * ~1900 changes, numerous bugfixes
9068 * The introductory documentation (now called The Rust Guide) has
9069 been completely rewritten, as have a number of supplementary
9071 * Rust's package manager, Cargo, continues to improve and is
9072 sometimes considered to be quite awesome.
9073 * Many API's in `std` have been reviewed and updated for
9074 consistency with the in-development Rust coding
9075 guidelines. The standard library documentation tracks
9076 stabilization progress.
9077 * Minor libraries have been moved out-of-tree to the rust-lang org
9078 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9079 be installed with Cargo.
9080 * Lifetime elision allows lifetime annotations to be left off of
9081 function declarations in many common scenarios.
9082 * Rust now works on 64-bit Windows.
9085 * Indexing can be overloaded with the `Index` and `IndexMut`
9087 * The `if let` construct takes a branch only if the `let` pattern
9088 matches, currently behind the 'if_let' feature gate.
9089 * 'where clauses', a more flexible syntax for specifying trait
9090 bounds that is more aesthetic, have been added for traits and
9091 free functions. Where clauses will in the future make it
9092 possible to constrain associated types, which would be
9093 impossible with the existing syntax.
9094 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9095 the 'slicing_syntax' feature gate, and can be overloaded with
9096 the `Slice` or `SliceMut` traits.
9097 * The syntax for matching of sub-slices has been changed to use a
9098 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9099 consistency with other uses of `..` and to future-proof
9100 potential additional uses of the syntax.
9101 * The syntax for matching inclusive ranges in patterns has changed
9102 from `0..3` to `0...4` to be consistent with the exclusive range
9104 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9105 c]`) has been put behind the 'advanced_slice_patterns' feature
9106 gate and may be removed in the future.
9107 * Components of tuples and tuple structs can be extracted using
9108 the `value.0` syntax, currently behind the `tuple_indexing`
9110 * The `#[crate_id]` attribute is no longer supported; versioning
9111 is handled by the package manager.
9112 * Renaming crate imports are now written `extern crate foo as bar`
9113 instead of `extern crate bar = foo`.
9114 * Renaming use statements are now written `use foo as bar` instead
9116 * `let` and `match` bindings and argument names in macros are now
9118 * The new, more efficient, closure types ('unboxed closures') have
9119 been added under a feature gate, 'unboxed_closures'. These will
9120 soon replace the existing closure types, once higher-ranked
9121 trait lifetimes are added to the language.
9122 * `move` has been added as a keyword, for indicating closures
9123 that capture by value.
9124 * Mutation and assignment is no longer allowed in pattern guards.
9125 * Generic structs and enums can now have trait bounds.
9126 * The `Share` trait is now called `Sync` to free up the term
9127 'shared' to refer to 'shared reference' (the default reference
9129 * Dynamically-sized types have been mostly implemented,
9130 unifying the behavior of fat-pointer types with the rest of the
9132 * As part of dynamically-sized types, the `Sized` trait has been
9133 introduced, which qualifying types implement by default, and
9134 which type parameters expect by default. To specify that a type
9135 parameter does not need to be sized, write `<Sized? T>`. Most
9136 types are `Sized`, notable exceptions being unsized arrays
9137 (`[T]`) and trait types.
9138 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9139 * Lifetime bounds can now be applied to type parameters and object
9141 * The old, reference counted GC type, `Gc<T>` which was once
9142 denoted by the `@` sigil, has finally been removed. GC will be
9143 revisited in the future.
9146 * Library documentation has been improved for a number of modules.
9147 * Bit-vectors, collections::bitv has been modernized.
9148 * The url crate is deprecated in favor of
9149 http://github.com/servo/rust-url, which can be installed with
9151 * Most I/O stream types can be cloned and subsequently closed from
9153 * A `std::time::Duration` type has been added for use in I/O
9154 methods that rely on timers, as well as in the 'time' crate's
9155 `Timespec` arithmetic.
9156 * The runtime I/O abstraction layer that enabled the green thread
9157 scheduler to do non-thread-blocking I/O has been removed, along
9158 with the libuv-based implementation employed by the green thread
9159 scheduler. This will greatly simplify the future I/O work.
9160 * `collections::btree` has been rewritten to have a more
9161 idiomatic and efficient design.
9164 * rustdoc output now indicates the stability levels of API's.
9165 * The `--crate-name` flag can specify the name of the crate
9166 being compiled, like `#[crate_name]`.
9167 * The `-C metadata` specifies additional metadata to hash into
9168 symbol names, and `-C extra-filename` specifies additional
9169 information to put into the output filename, for use by the
9170 package manager for versioning.
9171 * debug info generation has continued to improve and should be
9172 more reliable under both gdb and lldb.
9173 * rustc has experimental support for compiling in parallel
9174 using the `-C codegen-units` flag.
9175 * rustc no longer encodes rpath information into binaries by
9179 * Stack usage has been optimized with LLVM lifetime annotations.
9180 * Official Rust binaries on Linux are more compatible with older
9181 kernels and distributions, built on CentOS 5.10.
9184 Version 0.11.0 (2014-07-02)
9185 ==========================
9187 * ~1700 changes, numerous bugfixes
9190 * ~[T] has been removed from the language. This type is superseded by
9192 * ~str has been removed from the language. This type is superseded by
9194 * ~T has been removed from the language. This type is superseded by the
9196 * @T has been removed from the language. This type is superseded by the
9197 standard library's std::gc::Gc<T> type.
9198 * Struct fields are now all private by default.
9199 * Vector indices and shift amounts are both required to be a `uint`
9200 instead of any integral type.
9201 * Byte character, byte string, and raw byte string literals are now all
9202 supported by prefixing the normal literal with a `b`.
9203 * Multiple ABIs are no longer allowed in an ABI string
9204 * The syntax for lifetimes on closures/procedures has been tweaked
9205 slightly: `<'a>|A, B|: 'b + K -> T`
9206 * Floating point modulus has been removed from the language; however it
9207 is still provided by a library implementation.
9208 * Private enum variants are now disallowed.
9209 * The `priv` keyword has been removed from the language.
9210 * A closure can no longer be invoked through a &-pointer.
9211 * The `use foo, bar, baz;` syntax has been removed from the language.
9212 * The transmute intrinsic no longer works on type parameters.
9213 * Statics now allow blocks/items in their definition.
9214 * Trait bounds are separated from objects with + instead of : now.
9215 * Objects can no longer be read while they are mutably borrowed.
9216 * The address of a static is now marked as insignificant unless the
9217 #[inline(never)] attribute is placed it.
9218 * The #[unsafe_destructor] attribute is now behind a feature gate.
9219 * Struct literals are no longer allowed in ambiguous positions such as
9220 if, while, match, and for..in.
9221 * Declaration of lang items and intrinsics are now feature-gated by
9223 * Integral literals no longer default to `int`, and floating point
9224 literals no longer default to `f64`. Literals must be suffixed with an
9225 appropriate type if inference cannot determine the type of the
9227 * The Box<T> type is no longer implicitly borrowed to &mut T.
9228 * Procedures are now required to not capture borrowed references.
9231 * The standard library is now a "facade" over a number of underlying
9232 libraries. This means that development on the standard library should
9233 be speedier due to smaller crates, as well as a clearer line between
9235 * A new library, libcore, lives under the standard library's facade
9236 which is Rust's "0-assumption" library, suitable for embedded and
9237 kernel development for example.
9238 * A regex crate has been added to the standard distribution. This crate
9239 includes statically compiled regular expressions.
9240 * The unwrap/unwrap_err methods on Result require a Show bound for
9241 better error messages.
9242 * The return types of the std::comm primitives have been centralized
9243 around the Result type.
9244 * A number of I/O primitives have gained the ability to time out their
9246 * A number of I/O primitives have gained the ability to close their
9247 reading/writing halves to cancel pending operations.
9248 * Reverse iterator methods have been removed in favor of `rev()` on
9249 their forward-iteration counterparts.
9250 * A bitflags! macro has been added to enable easy interop with C and
9251 management of bit flags.
9252 * A debug_assert! macro is now provided which is disabled when
9253 `--cfg ndebug` is passed to the compiler.
9254 * A graphviz crate has been added for creating .dot files.
9255 * The std::cast module has been migrated into std::mem.
9256 * The std::local_data api has been migrated from freestanding functions
9257 to being based on methods.
9258 * The Pod trait has been renamed to Copy.
9259 * jemalloc has been added as the default allocator for types.
9260 * The API for allocating memory has been changed to use proper alignment
9261 and sized deallocation
9262 * Connecting a TcpStream or binding a TcpListener is now based on a
9263 string address and a u16 port. This allows connecting to a hostname as
9265 * The Reader trait now contains a core method, read_at_least(), which
9266 correctly handles many repeated 0-length reads.
9267 * The process-spawning API is now centered around a builder-style
9269 * The :? printing qualifier has been moved from the standard library to
9270 an external libdebug crate.
9271 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9272 have been renamed to Eq/Ord.
9273 * The select/plural methods have been removed from format!. The escapes
9274 for { and } have also changed from \{ and \} to {{ and }},
9276 * The TaskBuilder API has been re-worked to be a true builder, and
9277 extension traits for spawning native/green tasks have been added.
9280 * All breaking changes to the language or libraries now have their
9281 commit message annotated with `[breaking-change]` to allow for easy
9282 discovery of breaking changes.
9283 * The compiler will now try to suggest how to annotate lifetimes if a
9284 lifetime-related error occurs.
9285 * Debug info continues to be improved greatly with general bug fixes and
9286 better support for situations like link time optimization (LTO).
9287 * Usage of syntax extensions when cross-compiling has been fixed.
9288 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9289 -fdata-sections and --gc-sections has been enabled by default
9290 * The compiler is now stricter about where it will load module files
9291 from when a module is declared via `mod foo;`.
9292 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9293 Syntax extensions are now discovered via a "plugin registrar" type
9294 which will be extended in the future to other various plugins.
9295 * Lints have been restructured to allow for dynamically loadable lints.
9296 * A number of rustdoc improvements:
9297 * The HTML output has been visually redesigned.
9298 * Markdown is now powered by hoedown instead of sundown.
9299 * Searching heuristics have been greatly improved.
9300 * The search index has been reduced in size by a great amount.
9301 * Cross-crate documentation via `pub use` has been greatly improved.
9302 * Primitive types are now hyperlinked and documented.
9303 * Documentation has been moved from static.rust-lang.org/doc to
9305 * A new sandbox, play.rust-lang.org, is available for running and
9306 sharing rust code examples on-line.
9307 * Unused attributes are now more robustly warned about.
9308 * The dead_code lint now warns about unused struct fields.
9309 * Cross-compiling to iOS is now supported.
9310 * Cross-compiling to mipsel is now supported.
9311 * Stability attributes are now inherited by default and no longer apply
9312 to intra-crate usage, only inter-crate usage.
9313 * Error message related to non-exhaustive match expressions have been
9317 Version 0.10 (2014-04-03)
9318 =========================
9320 * ~1500 changes, numerous bugfixes
9323 * A new RFC process is now in place for modifying the language.
9324 * Patterns with `@`-pointers have been removed from the language.
9325 * Patterns with unique vectors (`~[T]`) have been removed from the
9327 * Patterns with unique strings (`~str`) have been removed from the
9329 * `@str` has been removed from the language.
9330 * `@[T]` has been removed from the language.
9331 * `@self` has been removed from the language.
9332 * `@Trait` has been removed from the language.
9333 * Headers on `~` allocations which contain `@` boxes inside the type for
9334 reference counting have been removed.
9335 * The semantics around the lifetimes of temporary expressions have changed,
9336 see #3511 and #11585 for more information.
9337 * Cross-crate syntax extensions are now possible, but feature gated. See
9338 #11151 for more information. This includes both `macro_rules!` macros as
9339 well as syntax extensions such as `format!`.
9340 * New lint modes have been added, and older ones have been turned on to be
9342 * Unnecessary parentheses
9345 * Uppercase variables
9346 * Publicly visible private types
9347 * `#[deriving]` with raw pointers
9348 * Unsafe functions can no longer be coerced to closures.
9349 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9350 * The `#[simd]` attribute is now behind a feature gate.
9351 * Visibility is no longer allowed on `extern crate` statements, and
9352 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9353 * Trailing commas are now allowed in argument lists and tuple patterns.
9354 * The `do` keyword has been removed, it is now a reserved keyword.
9355 * Default type parameters have been implemented, but are feature gated.
9356 * Borrowed variables through captures in closures are now considered soundly.
9357 * `extern mod` is now `extern crate`
9358 * The `Freeze` trait has been removed.
9359 * The `Share` trait has been added for types that can be shared among
9361 * Labels in macros are now hygienic.
9362 * Expression/statement macro invocations can be delimited with `{}` now.
9363 * Treatment of types allowed in `static mut` locations has been tweaked.
9364 * The `*` and `.` operators are now overloadable through the `Deref` and
9366 * `~Trait` and `proc` no longer have `Send` bounds by default.
9367 * Partial type hints are now supported with the `_` type marker.
9368 * An `Unsafe` type was introduced for interior mutability. It is now
9369 considered undefined to transmute from `&T` to `&mut T` without using the
9371 * The #[linkage] attribute was implemented for extern statics/functions.
9372 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9373 * `Pod` was renamed to `Copy`.
9376 * The `libextra` library has been removed. It has now been decomposed into
9377 component libraries with smaller and more focused nuggets of
9378 functionality. The full list of libraries can be found on the
9379 documentation index page.
9380 * std: `std::condition` has been removed. All I/O errors are now propagated
9381 through the `Result` type. In order to assist with error handling, a
9382 `try!` macro for unwrapping errors with an early return and a lint for
9383 unused results has been added. See #12039 for more information.
9384 * std: The `vec` module has been renamed to `slice`.
9385 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9386 This will become the only growable vector in the future.
9387 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9388 are now found at `std::io::BufferedReader` instead of
9389 `std::io::buffered::BufferedReader`.
9390 * std: `print` and `println` are no longer in the prelude, the `print!` and
9391 `println!` macros are intended to be used instead.
9392 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9393 attempts to statically prevent cycles.
9394 * std: The standard distribution is adopting the policy of pushing failure
9395 to the user rather than failing in libraries. Many functions (such as
9396 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9397 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9398 deriving mode: `#[deriving(Show)]`.
9399 * std: `ToStr` is now implemented for all types implementing `Show`.
9400 * std: The formatting trait methods now take `&self` instead of `&T`
9401 * std: The `invert()` method on iterators has been renamed to `rev()`
9402 * std: `std::num` has seen a reduction in the genericity of its traits,
9403 consolidating functionality into a few core traits.
9404 * std: Backtraces are now printed on task failure if the environment
9405 variable `RUST_BACKTRACE` is present.
9406 * std: Naming conventions for iterators have been standardized. More details
9407 can be found on the wiki's style guide.
9408 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9409 still implement the function.
9410 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9411 * std: `assert_approx_eq!` has been removed
9412 * std: The `e` and `E` formatting specifiers for floats have been added to
9413 print them in exponential notation.
9414 * std: The `Times` trait has been removed
9415 * std: Indications of variance and opting out of builtin bounds is done
9416 through marker types in `std::kinds::marker` now
9417 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9418 `#[deriving(Hash)]` is now possible.
9419 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9420 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9421 * std: `Chan::new` is now `channel()`.
9422 * std: A new synchronous channel type has been implemented.
9423 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9424 * std: `hashmap` and `trie` have been moved to `libcollections`
9425 * std: `run` has been rolled into `io::process`
9426 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9427 * std: The equality and comparison traits have seen some reorganization.
9428 * std: `rand` has moved to `librand`.
9429 * std: `to_{lower,upper}case` has been implemented for `char`.
9430 * std: Logging has been moved to `liblog`.
9431 * collections: `HashMap` has been rewritten for higher performance and less
9433 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9434 it can be booted manually. The runtime guide has more information and
9436 * native: All I/O functionality except signals has been implemented.
9437 * green: Task spawning with `libgreen` has been optimized with stack caching
9438 and various trimming of code.
9439 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9440 * sync: The `extra::sync` module has been updated to modern rust (and moved
9441 to the `sync` library), tweaking and improving various interfaces while
9442 dropping redundant functionality.
9443 * sync: A new `Barrier` type has been added to the `sync` library.
9444 * sync: An efficient mutex for native and green tasks has been implemented.
9445 * serialize: The `base64` module has seen some improvement. It treats
9446 newlines better, has non-string error values, and has seen general
9448 * fourcc: A `fourcc!` macro was introduced
9449 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9450 hexadecimal literal.
9453 * `rustpkg` has been deprecated and removed from the main repository. Its
9454 replacement, `cargo`, is under development.
9455 * Nightly builds of rust are now available
9456 * The memory usage of rustc has been improved many times throughout this
9458 * The build process supports disabling rpath support for the rustc binary
9460 * Code generation has improved in some cases, giving more information to the
9461 LLVM optimization passes to enable more extensive optimizations.
9462 * Debuginfo compatibility with lldb on OSX has been restored.
9463 * The master branch is now gated on an android bot, making building for
9464 android much more reliable.
9465 * Output flags have been centralized into one `--emit` flag.
9466 * Crate type flags have been centralized into one `--crate-type` flag.
9467 * Codegen flags have been consolidated behind a `-C` flag.
9468 * Linking against outdated crates now has improved error messages.
9469 * Error messages with lifetimes will often suggest how to annotate the
9470 function to fix the error.
9471 * Many more types are documented in the standard library, and new guides
9473 * Many `rustdoc` improvements:
9474 * code blocks are syntax highlighted.
9475 * render standalone markdown files.
9476 * the --test flag tests all code blocks by default.
9477 * exported macros are displayed.
9478 * re-exported types have their documentation inlined at the location of the
9480 * search works across crates that have been rendered to the same output
9484 Version 0.9 (2014-01-09)
9485 ==========================
9487 * ~1800 changes, numerous bugfixes
9490 * The `float` type has been removed. Use `f32` or `f64` instead.
9491 * A new facility for enabling experimental features (feature gating) has
9492 been added, using the crate-level `#[feature(foo)]` attribute.
9493 * Managed boxes (@) are now behind a feature gate
9494 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9495 standard library's `Gc` or `Rc` types instead.
9496 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9497 * Jumping back to the top of a loop is now done with `continue` instead of
9499 * Strings can no longer be mutated through index assignment.
9500 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9501 hash delimiters, as in `r###"foo"###`.
9502 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9504 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9505 * `@fn`s have been removed.
9506 * `do` only works with procs in order to make it obvious what the cost
9508 * Single-element tuple-like structs can no longer be dereferenced to
9509 obtain the inner value. A more comprehensive solution for overloading
9510 the dereference operator will be provided in the future.
9511 * The `#[link(...)]` attribute has been replaced with
9512 `#[crate_id = "name#vers"]`.
9513 * Empty `impl`s must be terminated with empty braces and may not be
9514 terminated with a semicolon.
9515 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9516 no longer has any special meaning.
9517 * The old `fmt!` string formatting macro has been removed.
9518 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9519 `print!` and `println!`.
9520 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9521 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9522 `extern mod foo = "bar"` instead.
9523 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9524 * Macros can have attributes.
9525 * Macros can expand to items with attributes.
9526 * Macros can expand to multiple items.
9527 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9528 * Comments may be nested.
9529 * Values automatically coerce to trait objects they implement, without
9531 * Enum discriminants are no longer an entire word but as small as needed to
9532 contain all the variants. The `repr` attribute can be used to override
9533 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9534 `#[repr(C)]` to match C enums.
9535 * Non-string literals are not allowed in attributes (they never worked).
9536 * The FFI now supports variadic functions.
9537 * Octal numeric literals, as in `0o7777`.
9538 * The `concat!` syntax extension performs compile-time string concatenation.
9539 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9540 removed as Rust no longer uses segmented stacks.
9541 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9542 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9543 not `*`; ignoring remaining fields of a struct is also done with `..`,
9544 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9545 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9546 * `rustc` supports the "system" calling convention, which defaults to the
9547 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9549 * The `type_overflow` lint (default: warn) checks literals for overflow.
9550 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9551 * The `attribute_usage` lint (default: warn) warns about unknown
9553 * The `unknown_features` lint (default: warn) warns about unknown
9555 * The `dead_code` lint (default: warn) checks for dead code.
9556 * Rust libraries can be linked statically to one another
9557 * `#[link_args]` is behind the `link_args` feature gate.
9558 * Native libraries are now linked with `#[link(name = "foo")]`
9559 * Native libraries can be statically linked to a rust crate
9560 (`#[link(name = "foo", kind = "static")]`).
9561 * Native OS X frameworks are now officially supported
9562 (`#[link(name = "foo", kind = "framework")]`).
9563 * The `#[thread_local]` attribute creates thread-local (not task-local)
9564 variables. Currently behind the `thread_local` feature gate.
9565 * The `return` keyword may be used in closures.
9566 * Types that can be copied via a memcpy implement the `Pod` kind.
9567 * The `cfg` attribute can now be used on struct fields and enum variants.
9570 * std: The `option` and `result` API's have been overhauled to make them
9571 simpler, more consistent, and more composable.
9572 * std: The entire `std::io` module has been replaced with one that is
9573 more comprehensive and that properly interfaces with the underlying
9574 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9576 * std: `io::util` contains a number of useful implementations of
9577 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9578 `ZeroReader`, `TeeReader`.
9579 * std: The reference counted pointer type `extra::rc` moved into std.
9580 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9581 just a wrapper around it).
9582 * std: The `Either` type has been removed.
9583 * std: `fmt::Default` can be implemented for any type to provide default
9584 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9585 * std: The `rand` API continues to be tweaked.
9586 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9587 on failure in gdb, is now named `rust_fail`.
9588 * std: The `each_key` and `each_value` methods on `HashMap` have been
9589 replaced by the `keys` and `values` iterators.
9590 * std: Functions dealing with type size and alignment have moved from the
9591 `sys` module to the `mem` module.
9592 * std: The `path` module was written and API changed.
9593 * std: `str::from_utf8` has been changed to cast instead of allocate.
9594 * std: `starts_with` and `ends_with` methods added to vectors via the
9595 `ImmutableEqVector` trait, which is in the prelude.
9596 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9597 if the index is out of bounds.
9598 * std: Task failure no longer propagates between tasks, as the model was
9599 complex, expensive, and incompatible with thread-based tasks.
9600 * std: The `Any` type can be used for dynamic typing.
9601 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9603 * std: Methods that produce iterators generally do not have an `_iter`
9605 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9606 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9607 * std: `util::ignore` renamed to `prelude::drop`.
9608 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9610 * std: `vec::raw` has seen a lot of cleanup and API changes.
9611 * std: The standard library no longer includes any C++ code, and very
9612 minimal C, eliminating the dependency on libstdc++.
9613 * std: Runtime scheduling and I/O functionality has been factored out into
9614 extensible interfaces and is now implemented by two different crates:
9615 libnative, for native threading and I/O; and libgreen, for green threading
9616 and I/O. This paves the way for using the standard library in more limited
9617 embedded environments.
9618 * std: The `comm` module has been rewritten to be much faster, have a
9619 simpler, more consistent API, and to work for both native and green
9621 * std: All libuv dependencies have been moved into the rustuv crate.
9622 * native: New implementations of runtime scheduling on top of OS threads.
9623 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9625 * green: The green thread scheduler and message passing types are almost
9627 * extra: The `flatpipes` module had bitrotted and was removed.
9628 * extra: All crypto functions have been removed and Rust now has a policy of
9629 not reimplementing crypto in the standard library. In the future crypto
9630 will be provided by external crates with bindings to established libraries.
9631 * extra: `c_vec` has been modernized.
9632 * extra: The `sort` module has been removed. Use the `sort` method on
9636 * The `rust` and `rusti` commands have been removed, due to lack of
9638 * `rustdoc` was completely rewritten.
9639 * `rustdoc` can test code examples in documentation.
9640 * `rustpkg` can test packages with the argument, 'test'.
9641 * `rustpkg` supports arbitrary dependencies, including C libraries.
9642 * `rustc`'s support for generating debug info is improved again.
9643 * `rustc` has better error reporting for unbalanced delimiters.
9644 * `rustc`'s JIT support was removed due to bitrot.
9645 * Executables and static libraries can be built with LTO (-Z lto)
9646 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9650 Version 0.8 (2013-09-26)
9651 ============================
9653 * ~2200 changes, numerous bugfixes
9656 * The `for` loop syntax has changed to work with the `Iterator` trait.
9657 * At long last, unwinding works on Windows.
9658 * Default methods are ready for use.
9659 * Many trait inheritance bugs fixed.
9660 * Owned and borrowed trait objects work more reliably.
9661 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9662 * rustc can omit emission of code for the `debug!` macro if it is passed
9664 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9665 for foo.rs, then foo/mod.rs, and will generate an error when both are
9667 * Strings no longer contain trailing nulls. The new `std::c_str` module
9668 provides new mechanisms for converting to C strings.
9669 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9670 * The FFI has been overhauled such that foreign functions are called directly,
9671 instead of through a stack-switching wrapper.
9672 * Calling a foreign function must be done through a Rust function with the
9673 `#[fixed_stack_segment]` attribute.
9674 * The `externfn!` macro can be used to declare both a foreign function and
9675 a `#[fixed_stack_segment]` wrapper at once.
9676 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9677 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9678 * `priv` is disallowed everywhere except for struct fields and enum variants.
9679 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9680 * `ref` bindings in irrefutable patterns work correctly now.
9681 * `char` is now prevented from containing invalid code points.
9682 * Casting to `bool` is no longer allowed.
9683 * `\0` is now accepted as an escape in chars and strings.
9684 * `yield` is a reserved keyword.
9685 * `typeof` is a reserved keyword.
9686 * Crates may be imported by URL with `extern mod foo = "url";`.
9687 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9688 * Static vectors can be initialized with repeating elements,
9689 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9690 * Static structs can be initialized with functional record update,
9691 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9692 * `cfg!` can be used to conditionally execute code based on the crate
9693 configuration, similarly to `#[cfg(...)]`.
9694 * The `unnecessary_qualification` lint detects unneeded module
9695 prefixes (default: allow).
9696 * Arithmetic operations have been implemented on the SIMD types in
9697 `std::unstable::simd`.
9698 * Exchange allocation headers were removed, reducing memory usage.
9699 * `format!` implements a completely new, extensible, and higher-performance
9700 string formatting system. It will replace `fmt!`.
9701 * `print!` and `println!` write formatted strings (using the `format!`
9702 extension) to stdout.
9703 * `write!` and `writeln!` write formatted strings (using the `format!`
9704 extension) to the new Writers in `std::rt::io`.
9705 * The library section in which a function or static is placed may
9706 be specified with `#[link_section = "..."]`.
9707 * The `proto!` syntax extension for defining bounded message protocols
9709 * `macro_rules!` is hygienic for `let` declarations.
9710 * The `#[export_name]` attribute specifies the name of a symbol.
9711 * `unreachable!` can be used to indicate unreachable code, and fails
9715 * std: Transitioned to the new runtime, written in Rust.
9716 * std: Added an experimental I/O library, `rt::io`, based on the new
9718 * std: A new generic `range` function was added to the prelude, replacing
9719 `uint::range` and friends.
9720 * std: `range_rev` no longer exists. Since range is an iterator it can be
9721 reversed with `range(lo, hi).invert()`.
9722 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9723 renamed to `unwrap_or`.
9724 * std: The `iterator` module was renamed to `iter`.
9725 * std: Integral types now support the `checked_add`, `checked_sub`, and
9726 `checked_mul` operations for detecting overflow.
9727 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9729 * std: Methods are standardizing on conventions for casting methods:
9730 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9732 * std: The `CString` type in `c_str` provides new ways to convert to and
9734 * std: `DoubleEndedIterator` can yield elements in two directions.
9735 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9737 * std: `str::from_bytes` renamed to `str::from_utf8`.
9738 * std: `pop_opt` and `shift_opt` methods added to vectors.
9739 * std: The task-local data interface no longer uses @, and keys are
9740 no longer function pointers.
9741 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9742 * std: Added `SharedPort` to `comm`.
9743 * std: `Eq` has a default method for `ne`; only `eq` is required
9745 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9746 is required in implementations.
9747 * std: `is_utf8` performance is improved, impacting many string functions.
9748 * std: `os::MemoryMap` provides cross-platform mmap.
9749 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9750 are not 'in-bounds' are considered undefined.
9751 * std: Many freestanding functions in `vec` removed in favor of methods.
9752 * std: Many freestanding functions on scalar types removed in favor of
9754 * std: Many options to task builders were removed since they don't make
9755 sense in the new scheduler design.
9756 * std: More containers implement `FromIterator` so can be created by the
9758 * std: More complete atomic types in `unstable::atomics`.
9759 * std: `comm::PortSet` removed.
9760 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9761 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9762 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9763 default implementations.
9764 * std: Various `from_str` functions were removed in favor of a generic
9765 `from_str` which is available in the prelude.
9766 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9767 * extra: `dlist`, the doubly-linked list was modernized.
9768 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9769 * extra: Added `glob` module, replacing `std::os::glob`.
9770 * extra: `rope` was removed.
9771 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9772 * extra: `net`, and `timer` were removed. The experimental replacements
9773 are `std::rt::io::net` and `std::rt::io::timer`.
9774 * extra: Iterators implemented for `SmallIntMap`.
9775 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9776 * extra: `SmallIntSet` removed. Use `BitvSet`.
9777 * extra: Performance of JSON parsing greatly improved.
9778 * extra: `semver` updated to SemVer 2.0.0.
9779 * extra: `term` handles more terminals correctly.
9780 * extra: `dbg` module removed.
9781 * extra: `par` module removed.
9782 * extra: `future` was cleaned up, with some method renames.
9783 * extra: Most free functions in `getopts` were converted to methods.
9786 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9787 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9788 similarly to gcc's `--march` flag.
9789 * rustc's performance compiling small crates is much better.
9790 * rustpkg has received many improvements.
9791 * rustpkg supports git tags as package IDs.
9792 * rustpkg builds into target-specific directories so it can be used for
9794 * The number of concurrent test tasks is controlled by the environment
9795 variable RUST_TEST_TASKS.
9796 * The test harness can now report metrics for benchmarks.
9797 * All tools have man pages.
9798 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9799 * The runtime uses jemalloc for allocations.
9800 * Segmented stacks are temporarily disabled as part of the transition to
9801 the new runtime. Stack overflows are possible!
9802 * A new documentation backend, rustdoc_ng, is available for use. It is
9803 still invoked through the normal `rustdoc` command.
9806 Version 0.7 (2013-07-03)
9807 =======================
9809 * ~2000 changes, numerous bugfixes
9812 * `impl`s no longer accept a visibility qualifier. Put them on methods
9814 * The borrow checker has been rewritten with flow-sensitivity, fixing
9815 many bugs and inconveniences.
9816 * The `self` parameter no longer implicitly means `&'self self`,
9817 and can be explicitly marked with a lifetime.
9818 * Overloadable compound operators (`+=`, etc.) have been temporarily
9819 removed due to bugs.
9820 * The `for` loop protocol now requires `for`-iterators to return `bool`
9821 so they compose better.
9822 * The `Durable` trait is replaced with the `'static` bounds.
9823 * Trait default methods work more often.
9824 * Structs with the `#[packed]` attribute have byte alignment and
9825 no padding between fields.
9826 * Type parameters bound by `Copy` must now be copied explicitly with
9828 * It is now illegal to move out of a dereferenced unsafe pointer.
9829 * `Option<~T>` is now represented as a nullable pointer.
9830 * `@mut` does dynamic borrow checks correctly.
9831 * The `main` function is only detected at the topmost level of the crate.
9832 The `#[main]` attribute is still valid anywhere.
9833 * Struct fields may no longer be mutable. Use inherited mutability.
9834 * The `#[no_send]` attribute makes a type that would otherwise be
9836 * The `#[no_freeze]` attribute makes a type that would otherwise be
9838 * Unbounded recursion will abort the process after reaching the limit
9839 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9840 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9841 are never implicitly copyable.
9842 * `#[static_assert]` makes compile-time assertions about static bools.
9843 * At long last, 'argument modes' no longer exist.
9844 * The rarely used `use mod` statement no longer exists.
9847 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9849 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9850 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9852 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9853 and unsuffixed integer literals.
9856 * The `core` crate was renamed to `std`.
9857 * The `std` crate was renamed to `extra`.
9858 * More and improved documentation.
9859 * std: `iterator` module for external iterator objects.
9860 * Many old-style (internal, higher-order function) iterators replaced by
9861 implementations of `Iterator`.
9862 * std: Many old internal vector and string iterators,
9863 incl. `any`, `all`. removed.
9864 * std: The `finalize` method of `Drop` renamed to `drop`.
9865 * std: The `drop` method now takes `&mut self` instead of `&self`.
9866 * std: The prelude no longer re-exports any modules, only types and traits.
9867 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9868 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9869 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9870 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9871 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9872 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9873 * std: Many types implement `Clone`.
9874 * std: `path` type renamed to `Path`.
9875 * std: `mut` module and `Mut` type removed.
9876 * std: Many standalone functions removed in favor of methods and iterators
9877 in `vec`, `str`. In the future methods will also work as functions.
9878 * std: `reinterpret_cast` removed. Use `transmute`.
9879 * std: ascii string handling in `std::ascii`.
9880 * std: `Rand` is implemented for ~/@.
9881 * std: `run` module for spawning processes overhauled.
9882 * std: Various atomic types added to `unstable::atomic`.
9883 * std: Various types implement `Zero`.
9884 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9885 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9886 * std: Added `os::mkdir_recursive`.
9887 * std: Added `os::glob` function performs filesystems globs.
9888 * std: `FuzzyEq` renamed to `ApproxEq`.
9889 * std: `Map` now defines `pop` and `swap` methods.
9890 * std: `Cell` constructors converted to static methods.
9891 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9892 * extra: `flate` module moved from `std` to `extra`.
9893 * extra: `fileinput` module for iterating over a series of files.
9894 * extra: `Complex` number type and `complex` module.
9895 * extra: `Rational` number type and `rational` module.
9896 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9897 * extra: `term` uses terminfo now, is more correct.
9898 * extra: `arc` functions converted to methods.
9899 * extra: Implementation of fixed output size variations of SHA-2.
9902 * `unused_variables` lint mode for unused variables (default: warn).
9903 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9905 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9907 * `dead_assignment` lint mode for unread variables (default: warn).
9908 * `unnecessary_allocation` lint mode detects some heap allocations that are
9909 immediately borrowed so could be written without allocating (default: warn).
9910 * `missing_doc` lint mode (default: allow).
9911 * `unreachable_code` lint mode (default: warn).
9912 * The `rusti` command has been rewritten and a number of bugs addressed.
9913 * rustc outputs in color on more terminals.
9914 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9915 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9916 * Compiling with `-g` will make the binary record information about
9917 dynamic borrowcheck failures for debugging.
9918 * rustdoc has a nicer stylesheet.
9919 * Various improvements to rustdoc.
9920 * Improvements to rustpkg (see the detailed release notes).
9923 Version 0.6 (2013-04-03)
9924 ========================
9926 * ~2100 changes, numerous bugfixes
9929 * The self type parameter in traits is now spelled `Self`
9930 * The `self` parameter in trait and impl methods must now be explicitly
9931 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9932 * Static methods no longer require the `static` keyword and instead
9933 are distinguished by the lack of a `self` parameter
9934 * Replaced the `Durable` trait with the `'static` lifetime
9935 * The old closure type syntax with the trailing sigil has been
9936 removed in favor of the more consistent leading sigil
9937 * `super` is a keyword, and may be prefixed to paths
9938 * Trait bounds are separated with `+` instead of whitespace
9939 * Traits are implemented with `impl Trait for Type`
9940 instead of `impl Type: Trait`
9941 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9942 * The `export` keyword has finally been removed
9943 * The `move` keyword has been removed (see "Semantic changes")
9944 * The interior mutability qualifier on vectors, `[mut T]`, has been
9945 removed. Use `&mut [T]`, etc.
9946 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9947 * `fail` is no longer a keyword. Use `fail!()`
9948 * `assert` is no longer a keyword. Use `assert!()`
9949 * `log` is no longer a keyword. use `debug!`, etc.
9950 * 1-tuples may be represented as `(T,)`
9951 * Struct fields may no longer be `mut`. Use inherited mutability,
9952 `@mut T`, `core::mut` or `core::cell`
9953 * `extern mod { ... }` is no longer valid syntax for foreign
9954 function modules. Use extern blocks: `extern { ... }`
9955 * Newtype enums removed. Use tuple-structs.
9956 * Trait implementations no longer support visibility modifiers
9957 * Pattern matching over vectors improved and expanded
9958 * `const` renamed to `static` to correspond to lifetime name,
9959 and make room for future `static mut` unsafe mutable globals.
9960 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9961 * `Clone` implementations can be automatically generated with
9962 `#[deriving(Clone)]`
9963 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9964 instead of `foo as Bar`.
9965 * Fixed length vector types are now written as `[int, .. 3]`
9966 instead of `[int * 3]`.
9967 * Fixed length vector types can express the length as a constant
9968 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9971 * Types with owned pointers or custom destructors move by default,
9972 eliminating the `move` keyword
9973 * All foreign functions are considered unsafe
9974 * &mut is now unaliasable
9975 * Writes to borrowed @mut pointers are prevented dynamically
9977 * The name of the main function can be customized using #[main]
9978 * The default type of an inferred closure is &fn instead of @fn
9979 * `use` statements may no longer be "chained" - they cannot import
9980 identifiers imported by previous `use` statements
9981 * `use` statements are crate relative, importing from the "top"
9982 of the crate by default. Paths may be prefixed with `super::`
9983 or `self::` to change the search behavior.
9984 * Method visibility is inherited from the implementation declaration
9985 * Structural records have been removed
9986 * Many more types can be used in static items, including enums
9987 'static-lifetime pointers and vectors
9988 * Pattern matching over vectors improved and expanded
9989 * Typechecking of closure types has been overhauled to
9990 improve inference and eliminate unsoundness
9991 * Macros leave scope at the end of modules, unless that module is
9992 tagged with #[macro_escape]
9995 * Added big integers to `std::bigint`
9996 * Removed `core::oldcomm` module
9997 * Added pipe-based `core::comm` module
9998 * Numeric traits have been reorganized under `core::num`
9999 * `vec::slice` finally returns a slice
10000 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10001 * Containers reorganized around traits in `core::container`
10002 * `core::dvec` removed, `~[T]` is a drop-in replacement
10003 * `core::send_map` renamed to `core::hashmap`
10004 * `std::map` removed; replaced with `core::hashmap`
10005 * `std::treemap` reimplemented as an owned balanced tree
10006 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10007 * `core::trie` added as a fast ordered map for integer keys
10008 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10009 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10010 overload the comparison operators, whereas `TotalOrd` is used
10011 by certain container types
10014 * Replaced the 'cargo' package manager with 'rustpkg'
10015 * Added all-purpose 'rust' tool
10016 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10017 * rustc now *attempts* to offer spelling suggestions
10018 * Improved support for ARM and Android
10019 * Preliminary MIPS backend
10020 * Improved foreign function ABI implementation for x86, x86_64
10021 * Various memory usage improvements
10022 * Rust code may be embedded in foreign code under limited circumstances
10023 * Inline assembler supported by new asm!() syntax extension.
10026 Version 0.5 (2012-12-21)
10027 ===========================
10029 * ~900 changes, numerous bugfixes
10032 * Removed `<-` move operator
10033 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10034 * Removed old fixed length vector syntax - `[T]/N`
10035 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10036 * Macros may now expand to items and statements
10037 * `a.b()` is always parsed as a method call, never as a field projection
10038 * `Eq` and `IterBytes` implementations can be automatically generated
10039 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10040 * Removed the special crate language for `.rc` files
10041 * Function arguments may consist of any irrefutable pattern
10044 * `&` and `~` pointers may point to objects
10045 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10046 * Enum variants may be structs
10047 * Destructors can be added to all nominal types with the Drop trait
10048 * Structs and nullary enum variants may be constants
10049 * Values that cannot be implicitly copied are now automatically moved
10050 without writing `move` explicitly
10051 * `&T` may now be coerced to `*T`
10052 * Coercions happen in `let` statements as well as function calls
10053 * `use` statements now take crate-relative paths
10054 * The module and type namespaces have been merged so that static
10055 method names can be resolved under the trait in which they are
10058 * Improved support for language features
10059 * Trait inheritance works in many scenarios
10060 * More support for explicit self arguments in methods - `self`, `&self`
10061 `@self`, and `~self` all generally work as expected
10062 * Static methods work in more situations
10063 * Experimental: Traits may declare default methods for the implementations
10067 * New condition handling system in `core::condition`
10068 * Timsort added to `std::sort`
10069 * New priority queue, `std::priority_queue`
10070 * Pipes for serializable types, `std::flatpipes'
10071 * Serialization overhauled to be trait-based
10072 * Expanded `getopts` definitions
10073 * Moved futures to `std`
10074 * More functions are pure now
10075 * `core::comm` renamed to `oldcomm`. Still deprecated
10076 * `rustdoc` and `cargo` are libraries now
10079 * Added a preliminary REPL, `rusti`
10080 * License changed from MIT to dual MIT/APL2
10083 Version 0.4 (2012-10-15)
10084 ==========================
10086 * ~2000 changes, numerous bugfixes
10089 * All keywords are now strict and may not be used as identifiers anywhere
10090 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10091 'of', 'with', 'to', 'class'.
10092 * Classes are replaced with simpler structs
10093 * Explicit method self types
10094 * `ret` became `return` and `alt` became `match`
10095 * `import` is now `use`; `use is now `extern mod`
10096 * `extern mod { ... }` is now `extern { ... }`
10097 * `use mod` is the recommended way to import modules
10098 * `pub` and `priv` replace deprecated export lists
10099 * The syntax of `match` pattern arms now uses fat arrow (=>)
10100 * `main` no longer accepts an args vector; use `os::args` instead
10103 * Trait implementations are now coherent, ala Haskell typeclasses
10104 * Trait methods may be static
10105 * Argument modes are deprecated
10106 * Borrowed pointers are much more mature and recommended for use
10107 * Strings and vectors in the static region are stored in constant memory
10108 * Typestate was removed
10109 * Resolution rewritten to be more reliable
10110 * Support for 'dual-mode' data structures (freezing and thawing)
10113 * Most binary operators can now be overloaded via the traits in
10115 * `std::net::url` for representing URLs
10116 * Sendable hash maps in `core::send_map`
10117 * `core::task' gained a (currently unsafe) task-local storage API
10120 * An efficient new intertask communication primitive called the pipe,
10121 along with a number of higher-level channel types, in `core::pipes`
10122 * `std::arc`, an atomically reference counted, immutable, shared memory
10124 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10125 * Futures are now based on pipes and sendable
10126 * More robust linked task failure
10127 * Improved task builder API
10130 * Improved error reporting
10131 * Preliminary JIT support
10132 * Preliminary work on precise GC
10133 * Extensive architectural improvements to rustc
10134 * Begun a transition away from buggy C++-based reflection (shape) code to
10135 Rust-based (visitor) code
10136 * All hash functions and tables converted to secure, randomized SipHash
10139 Version 0.3 (2012-07-12)
10140 ========================
10142 * ~1900 changes, numerous bugfixes
10144 * New coding conveniences
10145 * Integer-literal suffix inference
10146 * Per-item control over warnings, errors
10147 * #[cfg(windows)] and #[cfg(unix)] attributes
10148 * Documentation comments
10149 * More compact closure syntax
10150 * 'do' expressions for treating higher-order functions as
10152 * *-patterns (wildcard extended to all constructor fields)
10155 * Name resolution pass and exhaustiveness checker rewritten
10156 * Region pointers and borrow checking supersede alias
10158 * Init-ness checking is now provided by a region-based liveness
10159 pass instead of the typestate pass; same for last-use analysis
10160 * Extensive work on region pointers
10162 * Experimental new language features
10163 * Slices and fixed-size, interior-allocated vectors
10164 * #!-comments for lang versioning, shell execution
10165 * Destructors and iface implementation for classes;
10166 type-parameterized classes and class methods
10167 * 'const' type kind for types that can be used to implement
10168 shared-memory concurrency patterns
10172 * Removal of various obsolete features
10173 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10174 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10176 * Constructs: do-while loops ('do' repurposed), fn binding,
10177 resources (replaced by destructors)
10179 * Compiler reorganization
10180 * Syntax-layer of compiler split into separate crate
10181 * Clang (from LLVM project) integrated into build
10182 * Typechecker split into sub-modules
10185 * New time functions
10186 * Extension methods for many built-in types
10187 * Arc: atomic-refcount read-only / exclusive-use shared cells
10188 * Par: parallel map and search routines
10189 * Extensive work on libuv interface
10190 * Much vector code moved to libraries
10191 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10192 #include, #include_str, #include_bin
10194 * Tool improvements
10195 * Cargo automatically resolves dependencies
10198 Version 0.2 (2012-03-29)
10199 =========================
10201 * >1500 changes, numerous bugfixes
10203 * New docs and doc tooling
10205 * New port: FreeBSD x86_64
10207 * Compilation model enhancements
10208 * Generics now specialized, multiply instantiated
10209 * Functions now inlined across separate crates
10211 * Scheduling, stack and threading fixes
10212 * Noticeably improved message-passing performance
10213 * Explicit schedulers
10217 * Experimental new language features
10218 * Operator overloading
10222 * Various language extensions
10223 * C-callback function types: 'crust fn ...'
10224 * Infinite-loop construct: 'loop { ... }'
10225 * Shorten 'mutable' to 'mut'
10226 * Required mutable-local qualifier: 'let mut ...'
10227 * Basic glob-exporting: 'export foo::*;'
10228 * Alt now exhaustive, 'alt check' for runtime-checked
10229 * Block-function form of 'for' loop, with 'break' and 'ret'.
10232 * AST quasi-quote syntax extension
10233 * Revived libuv interface
10234 * New modules: core::{future, iter}, std::arena
10235 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10236 * Extensive cleanup, regularization in libstd, libcore
10239 Version 0.1 (2012-01-20)
10240 ===============================
10242 * Most language features work, including:
10243 * Unique pointers, unique closures, move semantics
10244 * Interface-constrained generics
10245 * Static interface dispatch
10247 * Multithread task scheduling
10248 * Typestate predicates
10249 * Failure unwinding, destructors
10250 * Pattern matching and destructuring assignment
10251 * Lightweight block-lambda syntax
10252 * Preliminary macro-by-example
10254 * Compiler works with the following configurations:
10255 * Linux: x86 and x86_64 hosts and targets
10256 * macOS: x86 and x86_64 hosts and targets
10257 * Windows: x86 hosts and targets
10259 * Cross compilation / multi-target configuration supported.
10261 * Preliminary API-documentation and package-management tools included.
10265 * Documentation is incomplete.
10267 * Performance is below intended target.
10269 * Standard library APIs are subject to extensive change, reorganization.
10271 * Language-level versioning is not yet operational - future code will
10272 break unexpectedly.