1 Version 1.51.0 (2021-03-25)
2 ============================
6 - [You can now parameterize items such as functions, traits, and `struct`s by constant
7 values in addition to by types.][78135] E.g. you can now write the following. Note:
8 Only values of primitive integers, `bool`, or `char` types are currently permitted.
10 struct GenericArray<T, const LENGTH: usize> {
14 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
15 const fn last(&self) -> Option<&T> {
19 Some(&self.inner[LENGTH-1])
29 - [Added the `-Csplit-debuginfo` codegen option.][79570] This option controls whether
30 debug information is split across multiple files or packed into a single file.
31 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`, `aarch64-unknown-linux-gnu_ilp32`,
32 and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
33 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
34 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
35 - [Rust now uses `inline-asm` for stack probes when used with LLVM 11.0.1+][77885]
37 \* Refer to Rust's [platform support page][forge-platform-support] for more
38 information on Rust's tiered platform support.
43 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
44 - [`str` now implements `AsMut<str>`.][80279]
45 - [`u64` and `u128` now implement `From<char>`.][79502]
46 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
47 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
48 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
49 - [`io::Empty` now implements `io::Seek`.][78044]
50 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
51 `T: ?Sized` types.][80764]
56 - [`Arc::decrement_strong_count`]
57 - [`Arc::increment_strong_count`]
58 - [`Once::call_once_force`]
59 - [`Peekable::next_if_eq`]
60 - [`Peekable::next_if`]
61 - [`Seek::stream_position`]
63 - [`panic::panic_any`]
65 - [`ptr::addr_of_mut!`]
66 - [`slice::SlicePattern`]
67 - [`slice::fill_with`]
68 - [`slice::split_inclusive_mut`]
69 - [`slice::split_inclusive`]
70 - [`slice::strip_prefix`]
71 - [`slice::strip_suffix`]
72 - [`str::split_inclusive`]
79 - [Rustdoc will now include documentation for methods available from `Deref` traits.][80653]
80 - [You can now provide a `--default-theme` flag which sets the default theme to use for
81 documentation.][79642]
83 Various improvements to intra-doc links:
85 - [You can link to non-path primitives such as `slice`.][80181]
86 - [You can link to associated items.][74489]
87 - [You can now link to items with generics such as `Vec<T>`.][76934]
91 - [You can now pass `--include-ignored` to tests (e.g. with
92 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
97 - [Bumped the minimum `g++` for `linux-gnu` targets to `g++-8` from `g++-7`.][81521]
98 - [WASI platforms no longer use the `wasm-bindgen` ABI.][79998]
99 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
105 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
107 [78135]: https://github.com/rust-lang/rust/pull/78135
108 [74489]: https://github.com/rust-lang/rust/pull/74489
109 [76934]: https://github.com/rust-lang/rust/pull/76934
110 [79570]: https://github.com/rust-lang/rust/pull/79570
111 [80181]: https://github.com/rust-lang/rust/pull/80181
112 [79642]: https://github.com/rust-lang/rust/pull/79642
113 [80945]: https://github.com/rust-lang/rust/pull/80945
114 [80279]: https://github.com/rust-lang/rust/pull/80279
115 [80053]: https://github.com/rust-lang/rust/pull/80053
116 [79502]: https://github.com/rust-lang/rust/pull/79502
117 [75180]: https://github.com/rust-lang/rust/pull/75180
118 [79135]: https://github.com/rust-lang/rust/pull/79135
119 [81521]: https://github.com/rust-lang/rust/pull/81521
120 [80968]: https://github.com/rust-lang/rust/pull/80968
121 [80959]: https://github.com/rust-lang/rust/pull/80959
122 [80718]: https://github.com/rust-lang/rust/pull/80718
123 [80653]: https://github.com/rust-lang/rust/pull/80653
124 [80579]: https://github.com/rust-lang/rust/pull/80579
125 [79998]: https://github.com/rust-lang/rust/pull/79998
126 [78044]: https://github.com/rust-lang/rust/pull/78044
127 [81455]: https://github.com/rust-lang/rust/pull/81455
128 [80764]: https://github.com/rust-lang/rust/pull/80764
129 [80749]: https://github.com/rust-lang/rust/pull/80749
130 [80662]: https://github.com/rust-lang/rust/pull/80662
131 [77885]: https://github.com/rust-lang/rust/pull/77885
132 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
133 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
134 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
135 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
136 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
137 [`slice::SlicePattern`]: https://doc.rust-lang.org/nightly/core/slice/trait.SlicePattern.html
138 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
139 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
140 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
141 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
142 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
143 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
144 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
145 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
146 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
147 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
148 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
149 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
150 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
152 Version 1.50.0 (2021-02-11)
153 ============================
156 -----------------------
157 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
158 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
159 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
162 -----------------------
163 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
164 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
165 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
167 \* Refer to Rust's [platform support page][forge-platform-support] for more
168 information on Rust's tiered platform support.
171 -----------------------
173 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
174 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
175 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
176 This value cannot be a valid file descriptor, and now means `Option<File>` takes
177 up the same amount of space as `File`.
183 - [`btree_map::Entry::or_insert_with_key`]
186 - [`hash_map::Entry::or_insert_with_key`]
190 - [`UnsafeCell::get_mut`]
192 The following previously stable methods are now `const`.
194 - [`IpAddr::is_ipv4`]
195 - [`IpAddr::is_ipv6`]
198 - [`Layout::from_size_align`]
199 - `pow` for all integer types.
200 - `checked_pow` for all integer types.
201 - `saturating_pow` for all integer types.
202 - `wrapping_pow` for all integer types.
203 - `next_power_of_two` for all unsigned integer types.
204 - `checked_power_of_two` for all unsigned integer types.
207 -----------------------
209 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
210 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
211 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
212 contents of that directory for changes.][cargo/8973]
213 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
218 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
219 - [Running tests will now print the total time taken to execute.][75752]
224 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
225 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
226 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
227 unhygenic `macro_rules!` macros.][79472]
228 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
229 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
230 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
231 - [Dropped support for all cloudabi targets.][78439]
232 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
233 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
234 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
236 [74989]: https://github.com/rust-lang/rust/pull/74989
237 [79261]: https://github.com/rust-lang/rust/pull/79261
238 [79896]: https://github.com/rust-lang/rust/pull/79896
239 [79484]: https://github.com/rust-lang/rust/pull/79484
240 [79472]: https://github.com/rust-lang/rust/pull/79472
241 [79270]: https://github.com/rust-lang/rust/pull/79270
242 [79003]: https://github.com/rust-lang/rust/pull/79003
243 [78864]: https://github.com/rust-lang/rust/pull/78864
244 [78636]: https://github.com/rust-lang/rust/pull/78636
245 [78439]: https://github.com/rust-lang/rust/pull/78439
246 [78343]: https://github.com/rust-lang/rust/pull/78343
247 [78296]: https://github.com/rust-lang/rust/pull/78296
248 [78068]: https://github.com/rust-lang/rust/pull/78068
249 [75752]: https://github.com/rust-lang/rust/pull/75752
250 [74699]: https://github.com/rust-lang/rust/pull/74699
251 [78142]: https://github.com/rust-lang/rust/pull/78142
252 [77484]: https://github.com/rust-lang/rust/pull/77484
253 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
254 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
255 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
256 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
257 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
258 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
259 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
260 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
261 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
262 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
263 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
264 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
265 [`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
266 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
267 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
268 [`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
269 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
272 Version 1.49.0 (2020-12-31)
273 ============================
276 -----------------------
278 - [Unions can now implement `Drop`, and you can now have a field in a union
279 with `ManuallyDrop<T>`.][77547]
280 - [You can now cast uninhabited enums to integers.][76199]
281 - [You can now bind by reference and by move in patterns.][76119] This
282 allows you to selectively borrow individual components of a type. E.g.
290 let person = Person {
291 name: String::from("Alice"),
295 // `name` is moved out of person, but `age` is referenced.
296 let Person { name, ref age } = person;
297 println!("{} {}", name, age);
301 -----------------------
303 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
304 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
305 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
306 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
307 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
308 - [Output from threads spawned in tests is now captured.][78227]
309 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
311 \* Refer to Rust's [platform support page][forge-platform-support] for more
312 information on Rust's tiered platform support.
315 -----------------------
317 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
318 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
323 - [`slice::select_nth_unstable`]
324 - [`slice::select_nth_unstable_by`]
325 - [`slice::select_nth_unstable_by_key`]
327 The following previously stable methods are now `const`.
330 - [`Poll::is_pending`]
333 -----------------------
334 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
335 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
336 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
337 variable will be set if the crate being built is one the user selected to build, either
338 with `-p` or through defaults.
339 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
345 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
346 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
347 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
348 Previously such invalid or unused attributes could be ignored.
349 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
350 read [this post about the changes][rustdoc-ws-post] for more details.
351 - [Trait bounds are no longer inferred for associated types.][79904]
355 These changes provide no direct user facing benefits, but represent significant
356 improvements to the internals and overall performance of rustc and
359 - [rustc's internal crates are now compiled using the `initial-exec` Thread
360 Local Storage model.][78201]
361 - [Calculate visibilities once in resolve.][78077]
362 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
363 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
366 [75991]: https://github.com/rust-lang/rust/pull/75991
367 [78951]: https://github.com/rust-lang/rust/pull/78951
368 [78848]: https://github.com/rust-lang/rust/pull/78848
369 [78746]: https://github.com/rust-lang/rust/pull/78746
370 [78376]: https://github.com/rust-lang/rust/pull/78376
371 [78228]: https://github.com/rust-lang/rust/pull/78228
372 [78227]: https://github.com/rust-lang/rust/pull/78227
373 [78201]: https://github.com/rust-lang/rust/pull/78201
374 [78109]: https://github.com/rust-lang/rust/pull/78109
375 [78077]: https://github.com/rust-lang/rust/pull/78077
376 [77997]: https://github.com/rust-lang/rust/pull/77997
377 [77703]: https://github.com/rust-lang/rust/pull/77703
378 [77547]: https://github.com/rust-lang/rust/pull/77547
379 [77015]: https://github.com/rust-lang/rust/pull/77015
380 [76199]: https://github.com/rust-lang/rust/pull/76199
381 [76119]: https://github.com/rust-lang/rust/pull/76119
382 [75914]: https://github.com/rust-lang/rust/pull/75914
383 [79004]: https://github.com/rust-lang/rust/pull/79004
384 [78676]: https://github.com/rust-lang/rust/pull/78676
385 [79904]: https://github.com/rust-lang/rust/issues/79904
386 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
387 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
388 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
389 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
390 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
391 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
392 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
393 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
394 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
395 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
396 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
398 Version 1.48.0 (2020-11-19)
399 ==========================
404 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
405 is still rejected *semantically*, but can now be parsed by procedural macros.
409 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
410 `rustc` whether to link its own C runtime and libraries or to rely on a external
411 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
412 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
413 Note: If you're using cargo you must explicitly pass the `--target` flag.
414 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
416 \* Refer to Rust's [platform support page][forge-platform-support] for more
417 information on Rust's tiered platform support.
421 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
422 and `&Stderr`.][76275]
423 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
424 - [The `matches!` macro now supports having a trailing comma.][74880]
425 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
426 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
430 - [`slice::as_ptr_range`]
431 - [`slice::as_mut_ptr_range`]
432 - [`VecDeque::make_contiguous`]
433 - [`future::pending`]
436 The following previously stable methods are now `const fn`'s:
438 - [`Option::is_some`]
439 - [`Option::is_none`]
444 - [`Ordering::reverse`]
452 - [You can now link to items in `rustdoc` using the intra-doc link
453 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
454 a link to `std::future`'s documentation. See ["Linking to items by
455 name"][intradoc-links] for more information.
456 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
457 when searching through `rustdoc`'s UI.][75740]
461 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
462 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
463 promoted to `'static` lifetime any more inside `const fn`s.
464 - [Associated type bindings on trait objects are now verified to meet the bounds
465 declared on the trait when checking that they implement the trait.][27675]
466 - [When trait bounds on associated types or opaque types are ambiguous, the
467 compiler no longer makes an arbitrary choice on which bound to use.][54121]
468 - [Fixed recursive nonterminals not being expanded in macros during
469 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
470 correctly handling recursive nonterminal tokens.
471 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
472 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
473 in places where they have no effect.][73461]
474 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
475 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
476 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
477 disallow zero-initialization.][71274]
478 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
479 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
480 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
481 see the [`catch_unwind`] documentation for further information.
487 These changes provide no direct user facing benefits, but represent significant
488 improvements to the internals and overall performance of rustc and
491 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
492 You can continue building with `make` by setting `ninja=false` in
494 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
495 - [Made `ensure_sufficient_stack()` non-generic][76680]
497 [78143]: https://github.com/rust-lang/rust/issues/78143
498 [76680]: https://github.com/rust-lang/rust/pull/76680/
499 [76030]: https://github.com/rust-lang/rust/pull/76030/
500 [70212]: https://github.com/rust-lang/rust/pull/70212/
501 [27675]: https://github.com/rust-lang/rust/issues/27675/
502 [54121]: https://github.com/rust-lang/rust/issues/54121/
503 [71274]: https://github.com/rust-lang/rust/pull/71274/
504 [77386]: https://github.com/rust-lang/rust/pull/77386/
505 [77153]: https://github.com/rust-lang/rust/pull/77153/
506 [77055]: https://github.com/rust-lang/rust/pull/77055/
507 [76275]: https://github.com/rust-lang/rust/pull/76275/
508 [76310]: https://github.com/rust-lang/rust/pull/76310/
509 [76420]: https://github.com/rust-lang/rust/pull/76420/
510 [76158]: https://github.com/rust-lang/rust/pull/76158/
511 [75857]: https://github.com/rust-lang/rust/pull/75857/
512 [75585]: https://github.com/rust-lang/rust/pull/75585/
513 [75740]: https://github.com/rust-lang/rust/pull/75740/
514 [75502]: https://github.com/rust-lang/rust/pull/75502/
515 [74880]: https://github.com/rust-lang/rust/pull/74880/
516 [74922]: https://github.com/rust-lang/rust/pull/74922/
517 [74430]: https://github.com/rust-lang/rust/pull/74430/
518 [74194]: https://github.com/rust-lang/rust/pull/74194/
519 [73461]: https://github.com/rust-lang/rust/pull/73461/
520 [73166]: https://github.com/rust-lang/rust/pull/73166/
521 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
522 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
523 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
524 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
525 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
526 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
527 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
528 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
529 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
530 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
531 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
532 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
533 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
534 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
535 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
538 Version 1.47.0 (2020-10-08)
539 ==========================
543 - [Closures will now warn when not used.][74869]
547 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
548 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
550 - [Upgraded to LLVM 11.][73526]
551 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
552 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
553 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
555 \* Refer to Rust's [platform support page][forge-platform-support] for more
556 information on Rust's tiered platform support.
560 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
561 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
562 those of length less than 33.][74060]
563 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
564 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
565 `PartialEq`, and `PartialOrd`.][73583]
570 - [`Range::is_empty`]
571 - [`RangeInclusive::is_empty`]
572 - [`Result::as_deref`]
573 - [`Result::as_deref_mut`]
575 - [`pointer::offset_from`]
579 The following previously stable APIs have now been made const.
581 - [The `new` method for all `NonZero` integers.][73858]
582 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
583 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
584 methods for all integers.][73858]
585 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
586 signed integers.][73858]
587 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
588 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
589 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
590 `is_ascii_control` methods for `char` and `u8`.][73858]
594 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
595 You can override this by setting the following in your `Cargo.toml`.
597 [profile.release.build-override]
600 - [`cargo-help` will now display man pages for commands rather just the
601 `--help` text.][cargo/8456]
602 - [`cargo-metadata` now emits a `test` field indicating if a target has
603 tests enabled.][cargo/8478]
604 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
605 - [`cargo-publish` will now use an alternative registry by default if it's the
606 only registry specified in `package.publish`.][cargo/8571]
610 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
611 type based search.][75366]
612 - [Added the Ayu theme to rustdoc.][71237]
616 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
617 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
618 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
619 help to preserve more span information.][73084] These changes may cause
620 compiliation errors if your macro was unhygenic or didn't correctly handle
622 - [Moved support for the CloudABI target to tier 3.][75568]
623 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
624 - [Added the `rustc-docs` component.][75560] This allows you to install
625 and read the documentation for the compiler internal APIs. (Currently only
626 available for `x86_64-unknown-linux-gnu`.)
631 - [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.
633 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
634 [75048]: https://github.com/rust-lang/rust/pull/75048/
635 [74163]: https://github.com/rust-lang/rust/pull/74163/
636 [71237]: https://github.com/rust-lang/rust/pull/71237/
637 [74869]: https://github.com/rust-lang/rust/pull/74869/
638 [73858]: https://github.com/rust-lang/rust/pull/73858/
639 [75716]: https://github.com/rust-lang/rust/pull/75716/
640 [75908]: https://github.com/rust-lang/rust/pull/75908/
641 [75516]: https://github.com/rust-lang/rust/pull/75516/
642 [75560]: https://github.com/rust-lang/rust/pull/75560/
643 [75568]: https://github.com/rust-lang/rust/pull/75568/
644 [75366]: https://github.com/rust-lang/rust/pull/75366/
645 [75204]: https://github.com/rust-lang/rust/pull/75204/
646 [74650]: https://github.com/rust-lang/rust/pull/74650/
647 [74419]: https://github.com/rust-lang/rust/pull/74419/
648 [73964]: https://github.com/rust-lang/rust/pull/73964/
649 [74021]: https://github.com/rust-lang/rust/pull/74021/
650 [74060]: https://github.com/rust-lang/rust/pull/74060/
651 [73893]: https://github.com/rust-lang/rust/pull/73893/
652 [73526]: https://github.com/rust-lang/rust/pull/73526/
653 [73583]: https://github.com/rust-lang/rust/pull/73583/
654 [73084]: https://github.com/rust-lang/rust/pull/73084/
655 [73197]: https://github.com/rust-lang/rust/pull/73197/
656 [72488]: https://github.com/rust-lang/rust/pull/72488/
657 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
658 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
659 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
660 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
661 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
662 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
663 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
664 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
665 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
666 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
667 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
668 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
669 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
670 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
671 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
674 Version 1.46.0 (2020-08-27)
675 ==========================
679 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
680 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
681 const functions.][73862]
682 - [The `#[track_caller]` attribute can now be added to functions to use the
683 function's caller's location information for panic messages.][72445]
684 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
685 `x.0.0` over `(x.0).0`.
686 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
687 You currently can't use `mem::transmute` in constant functions.
691 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
692 - [Enabled static "Position Independent Executables" by default
693 for `x86_64-unknown-linux-musl`.][70740]
697 - [`mem::forget` is now a `const fn`.][73887]
698 - [`String` now implements `From<char>`.][73466]
699 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
700 integer types.][73032]
701 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
702 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
703 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
704 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
705 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
706 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
711 - [`vec::Drain::as_slice`]
715 Added a number of new environment variables that are now available when
716 compiling your crate.
718 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
719 the specific binary being compiled and the name of the crate.
720 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
721 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
725 - [The target configuration option `abi_blacklist` has been renamed
726 to `unsupported_abis`.][74150] The old name will still continue to work.
727 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
728 This was previously accepted but will become a hard error in a future release.
729 - [Rustc will fail to compile if you have a struct with
730 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
732 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
733 ensure that spans have the correct information, and may cause breakage if you
734 were relying on receiving spans with dummy information.
735 - [The InnoSetup installer for Windows is no longer available.][72569] This was
736 a legacy installer that was replaced by a MSI installer a few years ago but
737 was still being built.
738 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
739 - [Rustc will no longer accept overlapping trait implementations that only
740 differ in how the lifetime was bound.][72493]
741 - [Rustc now correctly relates the lifetime of an existential associated
742 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
743 you to pass a shorter lifetime than expected.
744 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
745 The library will need to be installed for `rustc` to work, even though we
746 expect it to be already available on most systems.
747 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
749 - [Pretty printing of some tokens in procedural macros changed.][75453] The
750 exact output returned by rustc's pretty printing is an unstable
751 implementation detail: we recommend any macro relying on it to switch to a
752 more robust parsing system.
754 [75453]: https://github.com/rust-lang/rust/issues/75453/
755 [74820]: https://github.com/rust-lang/rust/issues/74820/
756 [74420]: https://github.com/rust-lang/rust/issues/74420/
757 [74109]: https://github.com/rust-lang/rust/pull/74109/
758 [74150]: https://github.com/rust-lang/rust/pull/74150/
759 [73862]: https://github.com/rust-lang/rust/pull/73862/
760 [73887]: https://github.com/rust-lang/rust/pull/73887/
761 [73466]: https://github.com/rust-lang/rust/pull/73466/
762 [73516]: https://github.com/rust-lang/rust/pull/73516/
763 [73293]: https://github.com/rust-lang/rust/pull/73293/
764 [73007]: https://github.com/rust-lang/rust/pull/73007/
765 [73032]: https://github.com/rust-lang/rust/pull/73032/
766 [72920]: https://github.com/rust-lang/rust/pull/72920/
767 [72569]: https://github.com/rust-lang/rust/pull/72569/
768 [72583]: https://github.com/rust-lang/rust/pull/72583/
769 [72584]: https://github.com/rust-lang/rust/pull/72584/
770 [72717]: https://github.com/rust-lang/rust/pull/72717/
771 [72437]: https://github.com/rust-lang/rust/pull/72437/
772 [72445]: https://github.com/rust-lang/rust/pull/72445/
773 [72486]: https://github.com/rust-lang/rust/pull/72486/
774 [72493]: https://github.com/rust-lang/rust/pull/72493/
775 [72331]: https://github.com/rust-lang/rust/pull/72331/
776 [71896]: https://github.com/rust-lang/rust/pull/71896/
777 [71660]: https://github.com/rust-lang/rust/pull/71660/
778 [71322]: https://github.com/rust-lang/rust/pull/71322/
779 [70740]: https://github.com/rust-lang/rust/pull/70740/
780 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
781 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
782 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
783 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
784 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
787 Version 1.45.2 (2020-08-03)
788 ==========================
790 * [Fix bindings in tuple struct patterns][74954]
791 * [Fix track_caller integration with trait objects][74784]
793 [74954]: https://github.com/rust-lang/rust/issues/74954
794 [74784]: https://github.com/rust-lang/rust/issues/74784
797 Version 1.45.1 (2020-07-30)
798 ==========================
800 * [Fix const propagation with references.][73613]
801 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
802 * [Avoid spurious implicit region bound.][74509]
803 * [Install clippy on x.py install][74457]
805 [73613]: https://github.com/rust-lang/rust/pull/73613
806 [73078]: https://github.com/rust-lang/rust/issues/73078
807 [74509]: https://github.com/rust-lang/rust/pull/74509
808 [74457]: https://github.com/rust-lang/rust/pull/74457
811 Version 1.45.0 (2020-07-16)
812 ==========================
816 - [Out of range float to int conversions using `as` has been defined as a saturating
817 conversion.][71269] This was previously undefined behaviour, but you can use the
818 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
819 may be desirable in rare performance sensitive situations.
820 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
822 - [Function like procedural macros can now be used in expression, pattern, and statement
823 positions.][68717] This means you can now use a function-like procedural macro
824 anywhere you can use a declarative (`macro_rules!`) macro.
828 - [You can now override individual target features through the `target-feature`
829 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
830 equivalent to `-C target-feature=+avx2,+fma`.
831 - [Added the `force-unwind-tables` flag.][69984] This option allows
832 rustc to always generate unwind tables regardless of panic strategy.
833 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
834 to include LLVM bitcode into generated `rlib`s (this is on by default).
835 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
836 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
837 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
838 - [Upgraded to LLVM 10.][67759]
840 \* Refer to Rust's [platform support page][forge-platform-support] for more
841 information on Rust's tiered platform support.
846 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
848 - [`proc_macro::TokenStream` now implements `Default`.][72234]
849 - [You can now use `char` with
850 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
851 a range of codepoints.][72413] E.g.
852 you can now write the following;
854 for ch in 'a'..='z' {
858 // Prints "abcdefghijklmnopqrstuvwxyz"
860 - [`OsString` now implements `FromStr`.][71662]
861 - [The `saturating_neg` method has been added to all signed integer primitive
862 types, and the `saturating_abs` method has been added for all integer
863 primitive types.][71886]
864 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
865 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
867 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
868 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
869 integer types.][69813]
870 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
871 integer types.][72324]
872 - [The `fetch_update` method has been added to all atomic integer types.][71843]
877 - [`BTreeMap::remove_entry`]
879 - [`rc::Weak::as_ptr`]
880 - [`rc::Weak::from_raw`]
881 - [`rc::Weak::into_raw`]
882 - [`str::strip_prefix`]
883 - [`str::strip_suffix`]
884 - [`sync::Weak::as_ptr`]
885 - [`sync::Weak::from_raw`]
886 - [`sync::Weak::into_raw`]
887 - [`char::UNICODE_VERSION`]
888 - [`Span::resolved_at`]
889 - [`Span::located_at`]
890 - [`Span::mixed_site`]
891 - [`unix::process::CommandExt::arg0`]
896 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
901 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
902 `~~outdated information~~` becomes "~~outdated information~~".
903 - [Added an emoji to Rustdoc's deprecated API message.][72014]
907 - [Trying to self initialize a static value (that is creating a value using
908 itself) is unsound and now causes a compile error.][71140]
909 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
910 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
911 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
912 previously undocumented and not intended for public use. Rustdoc still provides
913 a non-zero exit code on errors.
914 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
915 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
916 flags while cargo is adding `embed-bitcode` itself. The recommended way to
917 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
918 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
922 - [Make clippy a git subtree instead of a git submodule][70655]
923 - [Unify the undo log of all snapshot types][69464]
925 [71848]: https://github.com/rust-lang/rust/issues/71848/
926 [73420]: https://github.com/rust-lang/rust/issues/73420/
927 [72324]: https://github.com/rust-lang/rust/pull/72324/
928 [71843]: https://github.com/rust-lang/rust/pull/71843/
929 [71886]: https://github.com/rust-lang/rust/pull/71886/
930 [72234]: https://github.com/rust-lang/rust/pull/72234/
931 [72239]: https://github.com/rust-lang/rust/pull/72239/
932 [72397]: https://github.com/rust-lang/rust/pull/72397/
933 [72413]: https://github.com/rust-lang/rust/pull/72413/
934 [72014]: https://github.com/rust-lang/rust/pull/72014/
935 [72062]: https://github.com/rust-lang/rust/pull/72062/
936 [72094]: https://github.com/rust-lang/rust/pull/72094/
937 [72133]: https://github.com/rust-lang/rust/pull/72133/
938 [67759]: https://github.com/rust-lang/rust/pull/67759/
939 [71900]: https://github.com/rust-lang/rust/pull/71900/
940 [71928]: https://github.com/rust-lang/rust/pull/71928/
941 [71662]: https://github.com/rust-lang/rust/pull/71662/
942 [71716]: https://github.com/rust-lang/rust/pull/71716/
943 [71447]: https://github.com/rust-lang/rust/pull/71447/
944 [71269]: https://github.com/rust-lang/rust/pull/71269/
945 [71095]: https://github.com/rust-lang/rust/pull/71095/
946 [71140]: https://github.com/rust-lang/rust/pull/71140/
947 [70655]: https://github.com/rust-lang/rust/pull/70655/
948 [70705]: https://github.com/rust-lang/rust/pull/70705/
949 [69984]: https://github.com/rust-lang/rust/pull/69984/
950 [69813]: https://github.com/rust-lang/rust/pull/69813/
951 [69464]: https://github.com/rust-lang/rust/pull/69464/
952 [68717]: https://github.com/rust-lang/rust/pull/68717/
953 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
954 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
955 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
956 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
957 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
958 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
959 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
960 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
961 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
962 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
963 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
964 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
965 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
966 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
967 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
968 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
969 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
972 Version 1.44.1 (2020-06-18)
973 ===========================
975 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
976 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
977 * [Fix crashes when finding backtrace on macOS.][71397]
978 * [Clippy applies lint levels into different files.][clippy/5356]
980 [71397]: https://github.com/rust-lang/rust/issues/71397
981 [73078]: https://github.com/rust-lang/rust/issues/73078
982 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
983 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
986 Version 1.44.0 (2020-06-04)
987 ==========================
991 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
992 - [Added the `unused_braces` lint.][70081]
994 **Syntax-only changes**
996 - [Expansion-driven outline module parsing][69838]
1001 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1006 These are still rejected semantically, so you will likely receive an error but
1007 these changes can be seen and parsed by macros and conditional compilation.
1011 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1012 Additionally when in incremental mode rustc defaults to 256 codegen units.
1013 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1014 a panic is thrown.][67502]
1015 - [Added tier 3\* support for the `aarch64-unknown-none` and
1016 `aarch64-unknown-none-softfloat` targets.][68334]
1017 - [Added tier 3 support for `arm64-apple-tvos` and
1018 `x86_64-apple-tvos` targets.][68191]
1023 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1024 `vec![]` to be able to be used in `const` contexts.
1025 - [`convert::Infallible` now implements `Hash`.][70281]
1026 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1027 a `&mut OsStr`.][70048]
1028 - [Unicode 13 is now supported.][69929]
1029 - [`String` now implements `From<&mut str>`.][69661]
1030 - [`IoSlice` now implements `Copy`.][69403]
1031 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1032 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1033 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1034 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1035 integer types.][69373]
1039 - [`PathBuf::with_capacity`]
1040 - [`PathBuf::capacity`]
1041 - [`PathBuf::clear`]
1042 - [`PathBuf::reserve`]
1043 - [`PathBuf::reserve_exact`]
1044 - [`PathBuf::shrink_to_fit`]
1045 - [`f32::to_int_unchecked`]
1046 - [`f64::to_int_unchecked`]
1047 - [`Layout::align_to`]
1048 - [`Layout::pad_to_align`]
1050 - [`Layout::extend`]
1054 - [Added the `cargo tree` command which will print a tree graph of
1055 your dependencies.][cargo/8062] E.g.
1057 mdbook v0.3.2 (/Users/src/rust/mdbook)
1059 │ ├── html5ever v0.24.0
1061 │ │ │ └── cfg-if v0.1.9
1063 │ │ └── markup5ever v0.9.0
1064 │ │ ├── log v0.4.8 (*)
1066 │ │ │ └── phf_shared v0.7.24
1067 │ │ │ ├── siphasher v0.2.3
1068 │ │ │ └── unicase v1.4.2
1069 │ │ │ [build-dependencies]
1070 │ │ │ └── version_check v0.1.5
1073 You can also display dependencies on multiple versions of the same crate with
1074 `cargo tree -d` (short for `cargo tree --duplicates`).
1078 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1079 the version in the sidebar.][69494]
1083 - [Rustc now correctly generates static libraries on Windows GNU targets with
1084 the `.a` extension, rather than the previous `.lib`.][70937]
1085 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1086 - [The `file_name` property in JSON output of macro errors now points the actual
1087 source file rather than the previous format of `<NAME macros>`.][70969]
1088 **Note:** this may not point to a file that actually exists on the user's system.
1089 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1090 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1091 not allow zero initialization such as `NonZeroU8`.][66059] This was
1092 previously a warning.
1093 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1094 operator has been defined as a saturating operation.][71269] This was previously
1095 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1096 continue using the current behaviour, which may be desirable in rare performance
1097 sensitive situations.
1101 These changes provide no direct user facing benefits, but represent significant
1102 improvements to the internals and overall performance of rustc and
1105 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1106 - [Replace big JS dict with JSON parsing.][71250]
1108 [69373]: https://github.com/rust-lang/rust/pull/69373/
1109 [66059]: https://github.com/rust-lang/rust/pull/66059/
1110 [68191]: https://github.com/rust-lang/rust/pull/68191/
1111 [68899]: https://github.com/rust-lang/rust/pull/68899/
1112 [71147]: https://github.com/rust-lang/rust/pull/71147/
1113 [71250]: https://github.com/rust-lang/rust/pull/71250/
1114 [70937]: https://github.com/rust-lang/rust/pull/70937/
1115 [70969]: https://github.com/rust-lang/rust/pull/70969/
1116 [70632]: https://github.com/rust-lang/rust/pull/70632/
1117 [70281]: https://github.com/rust-lang/rust/pull/70281/
1118 [70345]: https://github.com/rust-lang/rust/pull/70345/
1119 [70048]: https://github.com/rust-lang/rust/pull/70048/
1120 [70081]: https://github.com/rust-lang/rust/pull/70081/
1121 [70156]: https://github.com/rust-lang/rust/pull/70156/
1122 [71269]: https://github.com/rust-lang/rust/pull/71269/
1123 [69838]: https://github.com/rust-lang/rust/pull/69838/
1124 [69929]: https://github.com/rust-lang/rust/pull/69929/
1125 [69661]: https://github.com/rust-lang/rust/pull/69661/
1126 [69778]: https://github.com/rust-lang/rust/pull/69778/
1127 [69494]: https://github.com/rust-lang/rust/pull/69494/
1128 [69403]: https://github.com/rust-lang/rust/pull/69403/
1129 [69033]: https://github.com/rust-lang/rust/pull/69033/
1130 [68692]: https://github.com/rust-lang/rust/pull/68692/
1131 [68334]: https://github.com/rust-lang/rust/pull/68334/
1132 [67502]: https://github.com/rust-lang/rust/pull/67502/
1133 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1134 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1135 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1136 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1137 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1138 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1139 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1140 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1141 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1142 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1143 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1144 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1145 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1148 Version 1.43.1 (2020-05-07)
1149 ===========================
1151 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1152 * [Fixed the stabilization of AVX-512 features.][71473]
1153 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1155 [71430]: https://github.com/rust-lang/rust/pull/71430
1156 [71473]: https://github.com/rust-lang/rust/issues/71473
1157 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1160 Version 1.43.0 (2020-04-23)
1161 ==========================
1165 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1166 the type inferred correctly.][68129]
1167 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1169 **Syntax only changes**
1170 - [Allow `type Foo: Ord` syntactically.][69361]
1171 - [Fuse associated and extern items up to defaultness.][69194]
1172 - [Syntactically allow `self` in all `fn` contexts.][68764]
1173 - [Merge `fn` syntax + cleanup item parsing.][68728]
1174 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1175 For example, you may now write:
1177 macro_rules! mac_trait {
1187 These are still rejected *semantically*, so you will likely receive an error but
1188 these changes can be seen and parsed by macros and
1189 conditional compilation.
1194 - [You can now pass multiple lint flags to rustc to override the previous
1195 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1196 everything in the `unused` lint group except `unused-variables` which
1197 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1198 everything in the `unused` lint group **including** `unused-variables` since
1199 the allow flag is specified before the deny flag (and therefore overridden).
1200 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1201 if they are available on `windows-gnu`.][67429]
1202 - [rustc now buffers errors/warnings printed in JSON.][69227]
1206 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1207 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1208 respectively.][69538] **Note** These conversions are only available when `N`
1210 - [You can now use associated constants on floats and integers directly, rather
1211 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1212 `f32::NAN` with no imports.
1213 - [`u8::is_ascii` is now `const`.][68984]
1214 - [`String` now implements `AsMut<str>`.][68742]
1215 - [Added the `primitive` module to `std` and `core`.][67637] This module
1216 reexports Rust's primitive types. This is mainly useful in macros
1217 where you want avoid these types being shadowed.
1218 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1219 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1223 - [`Once::is_completed`]
1228 - [`iter::once_with`]
1232 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1233 your environment.][cargo/7823]
1234 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1235 executable path when running integration tests or benchmarks.][cargo/7697]
1236 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1237 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1241 - [Certain checks in the `const_err` lint were deemed unrelated to const
1242 evaluation][69185], and have been moved to the `unconditional_panic` and
1243 `arithmetic_overflow` lints.
1248 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1249 has been a warning since 1.36.0.
1250 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1251 led to some instances being accepted, and now correctly emits a hard error.
1253 [69340]: https://github.com/rust-lang/rust/pull/69340
1257 These changes provide no direct user facing benefits, but represent significant
1258 improvements to the internals and overall performance of `rustc` and
1261 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1262 - [Improved how rustc generates drop code.][67332]
1263 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1264 - [traits: preallocate 2 Vecs of known initial size][69022]
1265 - [Avoid exponential behaviour when relating types][68772]
1266 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1267 - [Improve performance of coherence checks][68966]
1268 - [Deduplicate types in the generator witness][68672]
1269 - [Invert control in struct_lint_level.][68725]
1271 [67332]: https://github.com/rust-lang/rust/pull/67332/
1272 [67429]: https://github.com/rust-lang/rust/pull/67429/
1273 [67637]: https://github.com/rust-lang/rust/pull/67637/
1274 [67642]: https://github.com/rust-lang/rust/pull/67642/
1275 [67878]: https://github.com/rust-lang/rust/pull/67878/
1276 [67885]: https://github.com/rust-lang/rust/pull/67885/
1277 [68129]: https://github.com/rust-lang/rust/pull/68129/
1278 [68672]: https://github.com/rust-lang/rust/pull/68672/
1279 [68725]: https://github.com/rust-lang/rust/pull/68725/
1280 [68728]: https://github.com/rust-lang/rust/pull/68728/
1281 [68738]: https://github.com/rust-lang/rust/pull/68738/
1282 [68742]: https://github.com/rust-lang/rust/pull/68742/
1283 [68764]: https://github.com/rust-lang/rust/pull/68764/
1284 [68772]: https://github.com/rust-lang/rust/pull/68772/
1285 [68943]: https://github.com/rust-lang/rust/pull/68943/
1286 [68952]: https://github.com/rust-lang/rust/pull/68952/
1287 [68966]: https://github.com/rust-lang/rust/pull/68966/
1288 [68984]: https://github.com/rust-lang/rust/pull/68984/
1289 [69022]: https://github.com/rust-lang/rust/pull/69022/
1290 [69185]: https://github.com/rust-lang/rust/pull/69185/
1291 [69194]: https://github.com/rust-lang/rust/pull/69194/
1292 [69201]: https://github.com/rust-lang/rust/pull/69201/
1293 [69227]: https://github.com/rust-lang/rust/pull/69227/
1294 [69548]: https://github.com/rust-lang/rust/pull/69548/
1295 [69256]: https://github.com/rust-lang/rust/pull/69256/
1296 [69361]: https://github.com/rust-lang/rust/pull/69361/
1297 [69366]: https://github.com/rust-lang/rust/pull/69366/
1298 [69538]: https://github.com/rust-lang/rust/pull/69538/
1299 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1300 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1301 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1302 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1303 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1304 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1305 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1306 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1309 Version 1.42.0 (2020-03-12)
1310 ==========================
1314 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1316 fn foo(words: &[&str]) {
1318 ["Hello", "World", "!", ..] => println!("Hello World!"),
1319 ["Foo", "Bar", ..] => println!("Baz"),
1320 rest => println!("{:?}", rest),
1324 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1325 that you can create an enum that has the exact layout and ABI of the type
1327 - [There are some *syntax-only* changes:][67131]
1328 - `default` is syntactically allowed before items in `trait` definitions.
1329 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1330 leave out their bodies in favor of `;`.
1331 - Bounds on associated types in `impl`s are now syntactically allowed
1332 (e.g. `type Foo: Ord;`).
1333 - `...` (the C-variadic type) may occur syntactically directly as the type of
1334 any function parameter.
1336 These are still rejected *semantically*, so you will likely receive an error
1337 but these changes can be seen and parsed by procedural macros and
1338 conditional compilation.
1342 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1343 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1344 - [`Option::{expect,unwrap}` and
1345 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1346 pointing to the location where they were called, rather than
1347 `core`'s internals. ][67887]
1349 \* Refer to Rust's [platform support page][forge-platform-support] for more
1350 information on Rust's tiered platform support.
1354 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1355 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1356 to implement `Sized`.][67935]
1357 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1358 - [`Layout::new` is now `const`.][66254]
1359 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1364 - [`CondVar::wait_while`]
1365 - [`CondVar::wait_timeout_while`]
1367 - [`DebugMap::value`]
1368 - [`ManuallyDrop::take`]
1370 - [`ptr::slice_from_raw_parts_mut`]
1371 - [`ptr::slice_from_raw_parts`]
1375 - [You no longer need to include `extern crate proc_macro;` to be able to
1376 `use proc_macro;` in the `2018` edition.][cargo/7700]
1380 - [`Error::description` has been deprecated, and its use will now produce a
1381 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1383 [68253]: https://github.com/rust-lang/rust/pull/68253/
1384 [68348]: https://github.com/rust-lang/rust/pull/68348/
1385 [67935]: https://github.com/rust-lang/rust/pull/67935/
1386 [68339]: https://github.com/rust-lang/rust/pull/68339/
1387 [68122]: https://github.com/rust-lang/rust/pull/68122/
1388 [67712]: https://github.com/rust-lang/rust/pull/67712/
1389 [67887]: https://github.com/rust-lang/rust/pull/67887/
1390 [67131]: https://github.com/rust-lang/rust/pull/67131/
1391 [67233]: https://github.com/rust-lang/rust/pull/67233/
1392 [66899]: https://github.com/rust-lang/rust/pull/66899/
1393 [66919]: https://github.com/rust-lang/rust/pull/66919/
1394 [66254]: https://github.com/rust-lang/rust/pull/66254/
1395 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1396 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1397 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1398 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1399 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1400 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1401 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1402 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1403 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1406 Version 1.41.1 (2020-02-27)
1407 ===========================
1409 * [Always check types of static items][69145]
1410 * [Always check lifetime bounds of `Copy` impls][69145]
1411 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1413 [69225]: https://github.com/rust-lang/rust/issues/69225
1414 [69145]: https://github.com/rust-lang/rust/pull/69145
1417 Version 1.41.0 (2020-01-30)
1418 ===========================
1423 - [You can now pass type parameters to foreign items when implementing
1424 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1425 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1426 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1427 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1428 - [You can now use any valid identifier in a `format_args` macro.][66847]
1429 Previously identifiers starting with an underscore were not allowed.
1430 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1431 enum variants.][66183] These are still rejected semantically, but
1432 can be seen and parsed by procedural macros and conditional compilation.
1437 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1438 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1439 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1440 - [You can now pass an arguments file passing the `@path` syntax
1441 to rustc.][66172] Note that the format differs somewhat from what is
1442 found in other tooling; please see [the documentation][argfile-docs] for
1444 - [You can now provide `--extern` flag without a path, indicating that it is
1445 available from the search path or specified with an `-L` flag.][64882]
1447 \* Refer to Rust's [platform support page][forge-platform-support] for more
1448 information on Rust's tiered platform support.
1450 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1455 - [The `core::panic` module is now stable.][66771] It was already stable
1457 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1458 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1459 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1464 - [`Result::map_or`]
1465 - [`Result::map_or_else`]
1466 - [`std::rc::Weak::weak_count`]
1467 - [`std::rc::Weak::strong_count`]
1468 - [`std::sync::Weak::weak_count`]
1469 - [`std::sync::Weak::strong_count`]
1474 - [Cargo will now document all the private items for binary crates
1475 by default.][cargo/7593]
1476 - [`cargo-install` will now reinstall the package if it detects that it is out
1477 of date.][cargo/7560]
1478 - [Cargo.lock now uses a more git friendly format that should help to reduce
1479 merge conflicts.][cargo/7579]
1480 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1481 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1482 optimisation level to `2` for debug builds. You can also use
1483 `[profile.<profile>.build-override]` to override build scripts and
1489 - [You can now specify `edition` in documentation code blocks to compile the block
1490 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1491 should be compiled the 2018 edition of Rust.
1492 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1493 current theme with `--check-theme`.][54733]
1494 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1499 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1500 Apple targets.][apple-32bit-drop] This means that the source code is still
1501 available to build, but the targets are no longer being tested and release
1502 binaries for those platforms will no longer be distributed by the Rust project.
1503 Please refer to the linked blog post for more information.
1505 [54733]: https://github.com/rust-lang/rust/pull/54733/
1506 [61351]: https://github.com/rust-lang/rust/pull/61351/
1507 [67255]: https://github.com/rust-lang/rust/pull/67255/
1508 [66661]: https://github.com/rust-lang/rust/pull/66661/
1509 [66771]: https://github.com/rust-lang/rust/pull/66771/
1510 [66847]: https://github.com/rust-lang/rust/pull/66847/
1511 [66238]: https://github.com/rust-lang/rust/pull/66238/
1512 [66277]: https://github.com/rust-lang/rust/pull/66277/
1513 [66325]: https://github.com/rust-lang/rust/pull/66325/
1514 [66172]: https://github.com/rust-lang/rust/pull/66172/
1515 [66183]: https://github.com/rust-lang/rust/pull/66183/
1516 [65879]: https://github.com/rust-lang/rust/pull/65879/
1517 [65013]: https://github.com/rust-lang/rust/pull/65013/
1518 [64882]: https://github.com/rust-lang/rust/pull/64882/
1519 [64325]: https://github.com/rust-lang/rust/pull/64325/
1520 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1521 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1522 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1523 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1524 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1525 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1526 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1527 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1528 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1529 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1530 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1532 Version 1.40.0 (2019-12-19)
1533 ===========================
1537 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1538 `const` contexts.][65188] e.g.
1541 pub struct Point(i32, i32);
1543 const ORIGIN: Point = {
1544 let constructor = Point;
1550 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1551 indicate that there may be variants or fields added in the future.][64639]
1552 For example this requires adding a wild-card branch (`_ => {}`) to any match
1553 statements on a non-exhaustive `enum`. [(RFC 2008)]
1554 - [You can now use function-like procedural macros in `extern` blocks and in
1555 type positions.][63931] e.g. `type Generated = macro!();`
1556 - [Function-like and attribute procedural macros can now emit
1557 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1558 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1559 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1560 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1564 - [Added tier 3 support\* for the
1565 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1566 - [Added tier 3 support for the
1567 `aarch64-unknown-none-softfloat` target.][64589]
1568 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1569 `mips64el-unknown-linux-muslabi64` targets.][65843]
1571 \* Refer to Rust's [platform support page][forge-platform-support] for more
1572 information on Rust's tiered platform support.
1576 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1580 - [`BTreeMap::get_key_value`]
1581 - [`HashMap::get_key_value`]
1582 - [`Option::as_deref_mut`]
1583 - [`Option::as_deref`]
1584 - [`Option::flatten`]
1585 - [`UdpSocket::peer_addr`]
1586 - [`f32::to_be_bytes`]
1587 - [`f32::to_le_bytes`]
1588 - [`f32::to_ne_bytes`]
1589 - [`f64::to_be_bytes`]
1590 - [`f64::to_le_bytes`]
1591 - [`f64::to_ne_bytes`]
1592 - [`f32::from_be_bytes`]
1593 - [`f32::from_le_bytes`]
1594 - [`f32::from_ne_bytes`]
1595 - [`f64::from_be_bytes`]
1596 - [`f64::from_le_bytes`]
1597 - [`f64::from_ne_bytes`]
1604 - [Cargo will now always display warnings, rather than only on
1605 fresh builds.][cargo/7450]
1606 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1607 now produce an error.][cargo/7507] Previously these flags were ignored.
1608 - [You can now publish `dev-dependencies` without including
1609 a `version`.][cargo/7333]
1613 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1614 when running documentation tests with `rustdoc`.][63803]
1618 - [As previously announced, any previous NLL warnings in the 2015 edition are
1619 now hard errors.][64221]
1620 - [The `include!` macro will now warn if it failed to include the
1621 entire file.][64284] The `include!` macro unintentionally only includes the
1622 first _expression_ in a file, and this can be unintuitive. This will become
1623 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1624 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1625 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1626 or `extern` blocks now correctly emits a hard error.
1628 [65294]: https://github.com/rust-lang/rust/pull/65294/
1629 [66103]: https://github.com/rust-lang/rust/pull/66103/
1630 [65843]: https://github.com/rust-lang/rust/pull/65843/
1631 [65188]: https://github.com/rust-lang/rust/pull/65188/
1632 [65092]: https://github.com/rust-lang/rust/pull/65092/
1633 [64589]: https://github.com/rust-lang/rust/pull/64589/
1634 [64639]: https://github.com/rust-lang/rust/pull/64639/
1635 [64221]: https://github.com/rust-lang/rust/pull/64221/
1636 [64284]: https://github.com/rust-lang/rust/pull/64284/
1637 [63931]: https://github.com/rust-lang/rust/pull/63931/
1638 [64035]: https://github.com/rust-lang/rust/pull/64035/
1639 [63674]: https://github.com/rust-lang/rust/pull/63674/
1640 [63803]: https://github.com/rust-lang/rust/pull/63803/
1641 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1642 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1643 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1644 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1645 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1646 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1647 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1648 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1649 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1650 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1651 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1652 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1653 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1654 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1655 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1656 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1657 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1658 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1659 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1660 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1661 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1662 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1663 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1664 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1665 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1666 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1669 Version 1.39.0 (2019-11-07)
1670 ===========================
1674 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1675 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1676 - [You can now use certain attributes on function, closure, and function pointer
1677 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1678 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1679 attributes applied to items. e.g.
1682 #[cfg(windows)] slice: &[u16],
1683 #[cfg(not(windows))] slice: &[u8],
1688 - [You can now take shared references to bind-by-move patterns in the `if` guards
1689 of `match` arms.][63118] e.g.
1692 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1696 // ---- `nums` is bound by move.
1697 if nums.iter().sum::<u8>() == 10
1698 // ^------ `.iter()` implicitly takes a reference to `nums`.
1701 // ----------- Legal as `nums` was bound by move and so we have ownership.
1703 _ => unreachable!(),
1712 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1713 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1714 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1715 **Note** Cargo currently doesn't use this feature. Refer to
1716 [cargo#7315][cargo/7315] to track this feature's progress.
1717 - [You can now pass `--show-output` argument to test binaries to print the
1718 output of successful tests.][62600]
1721 \* Refer to Rust's [platform support page][forge-platform-support] for more
1722 information on Rust's tiered platform support.
1726 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1727 - [`LinkedList::new` is now a `const` function.][63684]
1728 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1729 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1730 now `const`.][63786]
1734 - [`Pin::into_inner`]
1735 - [`Instant::checked_duration_since`]
1736 - [`Instant::saturating_duration_since`]
1740 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1741 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1742 `--all` is now deprecated.
1746 - [You can now pass `-Clinker` to rustdoc to control the linker used
1747 for compiling doctests.][63834]
1751 - [Code that was previously accepted by the old borrow checker, but rejected by
1752 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1753 previously a warning, and will also become a hard error in the Rust 2015
1754 edition in the 1.40.0 release.
1755 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1756 run tests.][63827] This should improve performance when running a large
1758 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1759 recommended to use the `?` operator instead.
1760 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1763 [62600]: https://github.com/rust-lang/rust/pull/62600/
1764 [62672]: https://github.com/rust-lang/rust/pull/62672/
1765 [63118]: https://github.com/rust-lang/rust/pull/63118/
1766 [63209]: https://github.com/rust-lang/rust/pull/63209/
1767 [63402]: https://github.com/rust-lang/rust/pull/63402/
1768 [63565]: https://github.com/rust-lang/rust/pull/63565/
1769 [63595]: https://github.com/rust-lang/rust/pull/63595/
1770 [63684]: https://github.com/rust-lang/rust/pull/63684/
1771 [63698]: https://github.com/rust-lang/rust/pull/63698/
1772 [63770]: https://github.com/rust-lang/rust/pull/63770/
1773 [63786]: https://github.com/rust-lang/rust/pull/63786/
1774 [63827]: https://github.com/rust-lang/rust/pull/63827/
1775 [63834]: https://github.com/rust-lang/rust/pull/63834/
1776 [63927]: https://github.com/rust-lang/rust/pull/63927/
1777 [63933]: https://github.com/rust-lang/rust/pull/63933/
1778 [63934]: https://github.com/rust-lang/rust/pull/63934/
1779 [63938]: https://github.com/rust-lang/rust/pull/63938/
1780 [63940]: https://github.com/rust-lang/rust/pull/63940/
1781 [63941]: https://github.com/rust-lang/rust/pull/63941/
1782 [63945]: https://github.com/rust-lang/rust/pull/63945/
1783 [64010]: https://github.com/rust-lang/rust/pull/64010/
1784 [64028]: https://github.com/rust-lang/rust/pull/64028/
1785 [64334]: https://github.com/rust-lang/rust/pull/64334/
1786 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1787 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1788 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1789 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1790 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1791 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1793 Version 1.38.0 (2019-09-26)
1794 ==========================
1798 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1799 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1803 - [Added pipelined compilation support to `rustc`.][62766] This will
1804 improve compilation times in some cases. For further information please refer
1805 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1806 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1807 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1808 `x86_64-uwp-windows-msvc` targets.][60260]
1809 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1810 `armv7-unknown-linux-musleabi` targets.][63107]
1811 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1812 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1813 - [Upgraded to LLVM 9.][62592]
1815 \* Refer to Rust's [platform support page][forge-platform-support] for more
1816 information on Rust's tiered platform support.
1820 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1821 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1822 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1823 is available at `std::clone::Clone`). This also makes all built-in macros
1824 available in `std`/`core` root. e.g. `std::include_bytes!`.
1825 - [`str::Chars` now implements `Debug`.][63000]
1826 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1827 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1828 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1829 - [Added euclidean remainder and division operations (`div_euclid`,
1830 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1831 `overflowing`, and `wrapping` versions are available for all
1833 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1834 `PartialEq`.][61491]
1835 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1839 - [`<*const T>::cast`]
1840 - [`<*mut T>::cast`]
1841 - [`Duration::as_secs_f32`]
1842 - [`Duration::as_secs_f64`]
1843 - [`Duration::div_f32`]
1844 - [`Duration::div_f64`]
1845 - [`Duration::from_secs_f32`]
1846 - [`Duration::from_secs_f64`]
1847 - [`Duration::mul_f32`]
1848 - [`Duration::mul_f64`]
1849 - [`any::type_name`]
1853 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1854 - [You can now pass the `--features` option multiple times to enable
1855 multiple features.][cargo/7084]
1859 - [`rustc` will now warn about some incorrect uses of
1860 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1864 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1866 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1867 issues][62896] with certain crates such as libc.
1869 [60260]: https://github.com/rust-lang/rust/pull/60260/
1870 [61457]: https://github.com/rust-lang/rust/pull/61457/
1871 [61491]: https://github.com/rust-lang/rust/pull/61491/
1872 [61884]: https://github.com/rust-lang/rust/pull/61884/
1873 [61953]: https://github.com/rust-lang/rust/pull/61953/
1874 [62042]: https://github.com/rust-lang/rust/pull/62042/
1875 [62528]: https://github.com/rust-lang/rust/pull/62528/
1876 [62583]: https://github.com/rust-lang/rust/pull/62583/
1877 [62735]: https://github.com/rust-lang/rust/pull/62735/
1878 [62766]: https://github.com/rust-lang/rust/pull/62766/
1879 [62784]: https://github.com/rust-lang/rust/pull/62784/
1880 [62592]: https://github.com/rust-lang/rust/pull/62592/
1881 [62785]: https://github.com/rust-lang/rust/issues/62785/
1882 [62814]: https://github.com/rust-lang/rust/pull/62814/
1883 [62896]: https://github.com/rust-lang/rust/issues/62896/
1884 [63000]: https://github.com/rust-lang/rust/pull/63000/
1885 [63056]: https://github.com/rust-lang/rust/pull/63056/
1886 [63107]: https://github.com/rust-lang/rust/pull/63107/
1887 [63346]: https://github.com/rust-lang/rust/pull/63346/
1888 [63421]: https://github.com/rust-lang/rust/pull/63421/
1889 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1890 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1891 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1892 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1893 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1894 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1895 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1896 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1897 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1898 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1899 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1900 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1901 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1902 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1903 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1905 Version 1.37.0 (2019-08-15)
1906 ==========================
1910 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1911 [`Box`][62228], or an [array][62235] and unused.
1912 - [You can now use the `cfg` and `cfg_attr` attributes on
1913 generic parameters.][61547]
1914 - [You can now use enum variants through type alias.][61682] e.g. You can
1915 write the following:
1917 type MyOption = Option<u8>;
1919 fn increment_or_zero(x: MyOption) -> u8 {
1921 MyOption::Some(y) => y + 1,
1922 MyOption::None => 0,
1926 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1927 `const _: u32 = 5;`.
1928 - [You can now use `#[repr(align(X)]` on enums.][61229]
1929 - [The `?` Kleene macro operator is now available in the
1930 2015 edition.][60932]
1934 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1935 and `-C profile-use` flags.][61268] For more information on how to use profile
1936 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1937 - [The `rust-lldb` wrapper script should now work again.][61827]
1941 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1945 - [`BufReader::buffer`]
1946 - [`BufWriter::buffer`]
1947 - [`Cell::from_mut`]
1948 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1949 - [`DoubleEndedIterator::nth_back`]
1951 - [`Wrapping::reverse_bits`]
1952 - [`i128::reverse_bits`]
1953 - [`i16::reverse_bits`]
1954 - [`i32::reverse_bits`]
1955 - [`i64::reverse_bits`]
1956 - [`i8::reverse_bits`]
1957 - [`isize::reverse_bits`]
1958 - [`slice::copy_within`]
1959 - [`u128::reverse_bits`]
1960 - [`u16::reverse_bits`]
1961 - [`u32::reverse_bits`]
1962 - [`u64::reverse_bits`]
1963 - [`u8::reverse_bits`]
1964 - [`usize::reverse_bits`]
1968 - [`Cargo.lock` files are now included by default when publishing executable crates
1969 with executables.][cargo/7026]
1970 - [You can now specify `default-run="foo"` in `[package]` to specify the
1971 default executable to use for `cargo run`.][cargo/7056]
1978 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1979 Please transition your code to using the `..=` syntax for inclusive
1981 - [Using a trait object without the `dyn` will now warn by default.][61203]
1982 Please transition your code to use `dyn Trait` for trait objects instead.
1984 [62228]: https://github.com/rust-lang/rust/pull/62228/
1985 [62235]: https://github.com/rust-lang/rust/pull/62235/
1986 [61802]: https://github.com/rust-lang/rust/pull/61802/
1987 [61827]: https://github.com/rust-lang/rust/pull/61827/
1988 [61547]: https://github.com/rust-lang/rust/pull/61547/
1989 [61682]: https://github.com/rust-lang/rust/pull/61682/
1990 [61268]: https://github.com/rust-lang/rust/pull/61268/
1991 [61342]: https://github.com/rust-lang/rust/pull/61342/
1992 [61347]: https://github.com/rust-lang/rust/pull/61347/
1993 [61100]: https://github.com/rust-lang/rust/pull/61100/
1994 [61203]: https://github.com/rust-lang/rust/pull/61203/
1995 [61229]: https://github.com/rust-lang/rust/pull/61229/
1996 [60932]: https://github.com/rust-lang/rust/pull/60932/
1997 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1998 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1999 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2000 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2001 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2002 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2003 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2004 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2005 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2006 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2007 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2008 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2009 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2010 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2011 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2012 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2013 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2014 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2015 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2016 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2017 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2018 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2019 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2020 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2023 Version 1.36.0 (2019-07-04)
2024 ==========================
2028 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2029 - [The order of traits in trait objects no longer affects the semantics of that
2030 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2031 `dyn fmt::Debug + Send`, where this was previously not the case.
2035 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2036 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2037 - [`mem::needs_drop` is now available as a const fn.][60364]
2038 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2039 - [`String` now implements `BorrowMut<str>`.][60404]
2040 - [`io::Cursor` now implements `Default`.][60234]
2041 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2042 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2043 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2044 environment has access to heap memory allocation.
2045 - [`String` now implements `From<&String>`.][59825]
2046 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2047 return a tuple of each argument when there is multiple arguments.
2048 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2053 - [`VecDeque::rotate_left`]
2054 - [`VecDeque::rotate_right`]
2055 - [`Iterator::copied`]
2057 - [`io::IoSliceMut`]
2058 - [`Read::read_vectored`]
2059 - [`Write::write_vectored`]
2060 - [`str::as_mut_ptr`]
2061 - [`mem::MaybeUninit`]
2062 - [`pointer::align_offset`]
2063 - [`future::Future`]
2065 - [`task::RawWaker`]
2066 - [`task::RawWakerVTable`]
2072 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2073 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2075 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2079 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2086 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2087 longer recommended, and will be deprecated in 1.39.0.
2089 [60318]: https://github.com/rust-lang/rust/pull/60318/
2090 [60364]: https://github.com/rust-lang/rust/pull/60364/
2091 [60370]: https://github.com/rust-lang/rust/pull/60370/
2092 [60404]: https://github.com/rust-lang/rust/pull/60404/
2093 [60234]: https://github.com/rust-lang/rust/pull/60234/
2094 [60244]: https://github.com/rust-lang/rust/pull/60244/
2095 [58623]: https://github.com/rust-lang/rust/pull/58623/
2096 [59648]: https://github.com/rust-lang/rust/pull/59648/
2097 [59675]: https://github.com/rust-lang/rust/pull/59675/
2098 [59825]: https://github.com/rust-lang/rust/pull/59825/
2099 [59826]: https://github.com/rust-lang/rust/pull/59826/
2100 [59445]: https://github.com/rust-lang/rust/pull/59445/
2101 [59114]: https://github.com/rust-lang/rust/pull/59114/
2102 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2103 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2104 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2105 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2106 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2107 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2108 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2109 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2110 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2111 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2112 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2113 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2114 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2115 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2116 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2117 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2118 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2119 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2120 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2121 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2124 Version 1.35.0 (2019-05-23)
2125 ==========================
2129 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2130 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2131 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2133 unsafe fn call_unsafe(func: unsafe fn()) {
2138 unsafe { call_unsafe(|| {}); }
2145 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2146 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2147 - [Added the `wasm32-unknown-wasi` target.][59464]
2152 - [`Thread` will now show its ID in `Debug` output.][59460]
2153 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2154 - [`alloc::System` now implements `Default`.][59451]
2155 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2157 - [`char::{ToLowercase, ToUppercase}` now
2158 implement `ExactSizeIterator`.][58778]
2159 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2160 - [Removed the `Read` trait bounds
2161 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2162 - [You can now call the `dbg!` macro without any parameters to print the file
2163 and line where it is called.][57847]
2164 - [In place ASCII case conversions are now up to 4× faster.][59283]
2165 e.g. `str::make_ascii_lowercase`
2166 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2173 - [`RefCell::replace_with`]
2174 - [`RefCell::map_split`]
2176 - [`Range::contains`]
2177 - [`RangeFrom::contains`]
2178 - [`RangeTo::contains`]
2179 - [`RangeInclusive::contains`]
2180 - [`RangeToInclusive::contains`]
2181 - [`Option::copied`]
2185 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2186 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2191 - [The Rust toolchain is now available natively for musl based distros.][58575]
2193 [59460]: https://github.com/rust-lang/rust/pull/59460/
2194 [59464]: https://github.com/rust-lang/rust/pull/59464/
2195 [59500]: https://github.com/rust-lang/rust/pull/59500/
2196 [59512]: https://github.com/rust-lang/rust/pull/59512/
2197 [59580]: https://github.com/rust-lang/rust/pull/59580/
2198 [59283]: https://github.com/rust-lang/rust/pull/59283/
2199 [59451]: https://github.com/rust-lang/rust/pull/59451/
2200 [59076]: https://github.com/rust-lang/rust/pull/59076/
2201 [58778]: https://github.com/rust-lang/rust/pull/58778/
2202 [58717]: https://github.com/rust-lang/rust/pull/58717/
2203 [58369]: https://github.com/rust-lang/rust/pull/58369/
2204 [58423]: https://github.com/rust-lang/rust/pull/58423/
2205 [58080]: https://github.com/rust-lang/rust/pull/58080/
2206 [57847]: https://github.com/rust-lang/rust/pull/57847/
2207 [58575]: https://github.com/rust-lang/rust/pull/58575
2208 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2209 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2210 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2211 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2212 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2213 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2214 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2215 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2216 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2217 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2218 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2219 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2221 Version 1.34.2 (2019-05-14)
2222 ===========================
2224 * [Destabilize the `Error::type_id` function due to a security
2225 vulnerability][60785] ([CVE-2019-12083])
2227 [60785]: https://github.com/rust-lang/rust/pull/60785
2228 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2230 Version 1.34.1 (2019-04-25)
2231 ===========================
2233 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2234 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2235 * [Fix Clippy panic when checking some macros][clippy/3805]
2237 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2238 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2239 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2241 Version 1.34.0 (2019-04-11)
2242 ==========================
2246 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2247 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2249 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2250 `#[attr{}]` procedural macros.][57367]
2251 - [You can now write `extern crate self as foo;`][57407] to import your
2252 crate's root into the extern prelude.
2257 - [You can now target `riscv64imac-unknown-none-elf` and
2258 `riscv64gc-unknown-none-elf`.][58406]
2259 - [You can now enable linker plugin LTO optimisations with
2260 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2261 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2263 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2268 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2269 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2270 the `Hash` trait to create an iterator.
2271 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2272 methods.][58421] Most notably you no longer require the `Ord` trait to create
2274 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2275 for all numeric types.][58044]
2276 - [Indexing a `str` is now generic over all types that
2277 implement `SliceIndex<str>`.][57604]
2278 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2279 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2280 produce a warning if their returning type is unused.
2281 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2282 `overflowing_pow` are now available for all numeric types.][57873] These are
2283 equivalent to methods such as `wrapping_add` for the `pow` operation.
2291 * [`Error::type_id`]
2292 * [`atomic::AtomicI16`]
2293 * [`atomic::AtomicI32`]
2294 * [`atomic::AtomicI64`]
2295 * [`atomic::AtomicI8`]
2296 * [`atomic::AtomicU16`]
2297 * [`atomic::AtomicU32`]
2298 * [`atomic::AtomicU64`]
2299 * [`atomic::AtomicU8`]
2300 * [`convert::Infallible`]
2301 * [`convert::TryFrom`]
2302 * [`convert::TryInto`]
2304 * [`iter::successors`]
2305 * [`num::NonZeroI128`]
2306 * [`num::NonZeroI16`]
2307 * [`num::NonZeroI32`]
2308 * [`num::NonZeroI64`]
2309 * [`num::NonZeroI8`]
2310 * [`num::NonZeroIsize`]
2311 * [`slice::sort_by_cached_key`]
2312 * [`str::escape_debug`]
2313 * [`str::escape_default`]
2314 * [`str::escape_unicode`]
2315 * [`str::split_ascii_whitespace`]
2318 * [`Instant::checked_add`]
2319 * [`Instant::checked_sub`]
2320 * [`SystemTime::checked_add`]
2321 * [`SystemTime::checked_sub`]
2325 - [You can now use alternative registries to crates.io.][cargo/6654]
2329 - [You can now use the `?` operator in your documentation tests without manually
2330 adding `fn main() -> Result<(), _> {}`.][56470]
2334 - [`Command::before_exec` is being replaced by the unsafe method
2335 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2336 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2337 can now use `const` functions in `static` variables.
2339 [58370]: https://github.com/rust-lang/rust/pull/58370/
2340 [58406]: https://github.com/rust-lang/rust/pull/58406/
2341 [58421]: https://github.com/rust-lang/rust/pull/58421/
2342 [58166]: https://github.com/rust-lang/rust/pull/58166/
2343 [58044]: https://github.com/rust-lang/rust/pull/58044/
2344 [58057]: https://github.com/rust-lang/rust/pull/58057/
2345 [58059]: https://github.com/rust-lang/rust/pull/58059/
2346 [57809]: https://github.com/rust-lang/rust/pull/57809/
2347 [57873]: https://github.com/rust-lang/rust/pull/57873/
2348 [57604]: https://github.com/rust-lang/rust/pull/57604/
2349 [57367]: https://github.com/rust-lang/rust/pull/57367/
2350 [57407]: https://github.com/rust-lang/rust/pull/57407/
2351 [57425]: https://github.com/rust-lang/rust/pull/57425/
2352 [57106]: https://github.com/rust-lang/rust/pull/57106/
2353 [56470]: https://github.com/rust-lang/rust/pull/56470/
2354 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2355 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2356 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2357 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2358 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2359 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2360 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2361 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2362 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2363 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2364 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2365 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2366 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2367 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2368 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2369 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2370 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2371 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2372 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2373 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2374 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2375 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2376 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2377 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2378 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2379 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2380 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2381 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2382 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2383 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2384 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2387 Version 1.33.0 (2019-02-28)
2388 ==========================
2392 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2393 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2394 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2395 E.g. You can have match statement on a `u8` that covers `0..=255` and
2396 you would no longer be required to have a `_ => unreachable!()` case.
2397 - [You can now have multiple patterns in `if let` and `while let`
2398 expressions.][57532] You can do this with the same syntax as a `match`
2408 let state = Creature::Crab("Ferris");
2410 if let Creature::Crab(name) | Creature::Person(name) = state {
2411 println!("This creature's name is: {}", name);
2415 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2416 this feature will by default produce a warning as this behaviour can be
2417 unintuitive. E.g. `if let _ = 5 {}`
2418 - [You can now use `let` bindings, assignments, expression statements,
2419 and irrefutable pattern destructuring in const functions.][57175]
2420 - [You can now call unsafe const functions.][57067] E.g.
2422 const unsafe fn foo() -> i32 { 5 }
2423 const fn bar() -> i32 {
2427 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2428 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2429 - [You can now specify a specific alignment with the `#[repr(packed)]`
2430 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2431 with an alignment of 2 bytes and a size of 6 bytes.
2432 - [You can now import an item from a module as an `_`.][56303] This allows you to
2433 import a trait's impls, and not have the name in the namespace. E.g.
2435 use std::io::Read as _;
2437 // Allowed as there is only one `Read` in the module.
2440 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2444 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2445 command line argument.][56351]
2446 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2447 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2448 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2449 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2450 information on Rust's platform support.
2451 - [Added support for the `thumbv7neon-linux-androideabi` and
2452 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2453 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2457 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2458 functions for all numeric types.][57566]
2459 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2460 are now `const` functions for all numeric types.][57105]
2461 - [The methods `is_positive` and `is_negative` are now `const` functions for
2462 all signed numeric types.][57105]
2463 - [The `get` method for all `NonZero` types is now `const`.][57167]
2464 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2465 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2466 numeric types.][57234]
2467 - [`Ipv4Addr::new` is now a `const` function][57234]
2471 - [`unix::FileExt::read_exact_at`]
2472 - [`unix::FileExt::write_all_at`]
2473 - [`Option::transpose`]
2474 - [`Result::transpose`]
2475 - [`convert::identity`]
2478 - [`marker::PhantomPinned`]
2479 - [`Vec::resize_with`]
2480 - [`VecDeque::resize_with`]
2481 - [`Duration::as_millis`]
2482 - [`Duration::as_micros`]
2483 - [`Duration::as_nanos`]
2488 - [You can now publish crates that require a feature flag to compile with
2489 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2490 - [Cargo should now rebuild a crate if a file was modified during the initial
2495 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2496 are now deprecated in the standard library, and their usage will now produce a warning.
2497 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2499 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2501 - [Libtest no longer creates a new thread for each test when
2502 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2504 [55982]: https://github.com/rust-lang/rust/pull/55982/
2505 [56243]: https://github.com/rust-lang/rust/pull/56243
2506 [56303]: https://github.com/rust-lang/rust/pull/56303/
2507 [56351]: https://github.com/rust-lang/rust/pull/56351/
2508 [56362]: https://github.com/rust-lang/rust/pull/56362
2509 [56642]: https://github.com/rust-lang/rust/pull/56642/
2510 [56769]: https://github.com/rust-lang/rust/pull/56769/
2511 [56805]: https://github.com/rust-lang/rust/pull/56805
2512 [56947]: https://github.com/rust-lang/rust/pull/56947/
2513 [57049]: https://github.com/rust-lang/rust/pull/57049/
2514 [57067]: https://github.com/rust-lang/rust/pull/57067/
2515 [57105]: https://github.com/rust-lang/rust/pull/57105
2516 [57130]: https://github.com/rust-lang/rust/pull/57130/
2517 [57167]: https://github.com/rust-lang/rust/pull/57167/
2518 [57175]: https://github.com/rust-lang/rust/pull/57175/
2519 [57234]: https://github.com/rust-lang/rust/pull/57234/
2520 [57332]: https://github.com/rust-lang/rust/pull/57332/
2521 [57465]: https://github.com/rust-lang/rust/pull/57465/
2522 [57532]: https://github.com/rust-lang/rust/pull/57532/
2523 [57535]: https://github.com/rust-lang/rust/pull/57535/
2524 [57566]: https://github.com/rust-lang/rust/pull/57566/
2525 [57615]: https://github.com/rust-lang/rust/pull/57615/
2526 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2527 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2528 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2529 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2530 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2531 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2532 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2533 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2534 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2535 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2536 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2537 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2538 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2539 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2540 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2541 [platform-support]: https://forge.rust-lang.org/platform-support.html
2543 Version 1.32.0 (2019-01-17)
2544 ==========================
2549 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2550 operator allows you to specify zero or one repetitions similar to the `*` and
2552 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2553 now always resolve to the item (`enum`, `struct`, etc.) available in the
2554 module if present, before resolving to a external crate or an item the prelude.][56759]
2557 enum Color { Red, Green, Blue }
2563 - [You can now match against `PhantomData<T>` types.][55837]
2564 - [You can now match against literals in macros with the `literal`
2565 specifier.][56072] This will match against a literal of any type.
2566 E.g. `1`, `'A'`, `"Hello World"`
2567 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2569 struct Point(i32, i32);
2572 pub fn new(x: i32, y: i32) -> Self {
2576 pub fn is_origin(&self) -> bool {
2584 - [Self can also now be used in type definitions.][56366] E.g.
2588 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2591 Cons(T, Box<Self>) // likewise here
2594 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2595 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2599 - [The default allocator has changed from jemalloc to the default allocator on
2600 your system.][55238] The compiler itself on Linux & macOS will still use
2601 jemalloc, but programs compiled with it will use the system allocator.
2602 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2606 - [`PathBuf` now implements `FromStr`.][55148]
2607 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2608 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2609 easily debug expressions in your rust program. E.g.
2612 let b = dbg!(a * 2) + 1;
2613 // ^-- prints: [src/main.rs:4] a * 2 = 4
2617 The following APIs are now `const` functions and can be used in a
2621 - [`UnsafeCell::get`]
2622 - [`char::is_ascii`]
2624 - [`ManuallyDrop::new`]
2625 - [`ManuallyDrop::into_inner`]
2626 - [`RangeInclusive::start`]
2627 - [`RangeInclusive::end`]
2628 - [`NonNull::as_ptr`]
2631 - [`Duration::as_secs`]
2632 - [`Duration::subsec_millis`]
2633 - [`Duration::subsec_micros`]
2634 - [`Duration::subsec_nanos`]
2636 - [`Ipv4Addr::is_unspecified`]
2638 - [`Ipv6Addr::octets`]
2642 - [`i8::to_be_bytes`]
2643 - [`i8::to_le_bytes`]
2644 - [`i8::to_ne_bytes`]
2645 - [`i8::from_be_bytes`]
2646 - [`i8::from_le_bytes`]
2647 - [`i8::from_ne_bytes`]
2648 - [`i16::to_be_bytes`]
2649 - [`i16::to_le_bytes`]
2650 - [`i16::to_ne_bytes`]
2651 - [`i16::from_be_bytes`]
2652 - [`i16::from_le_bytes`]
2653 - [`i16::from_ne_bytes`]
2654 - [`i32::to_be_bytes`]
2655 - [`i32::to_le_bytes`]
2656 - [`i32::to_ne_bytes`]
2657 - [`i32::from_be_bytes`]
2658 - [`i32::from_le_bytes`]
2659 - [`i32::from_ne_bytes`]
2660 - [`i64::to_be_bytes`]
2661 - [`i64::to_le_bytes`]
2662 - [`i64::to_ne_bytes`]
2663 - [`i64::from_be_bytes`]
2664 - [`i64::from_le_bytes`]
2665 - [`i64::from_ne_bytes`]
2666 - [`i128::to_be_bytes`]
2667 - [`i128::to_le_bytes`]
2668 - [`i128::to_ne_bytes`]
2669 - [`i128::from_be_bytes`]
2670 - [`i128::from_le_bytes`]
2671 - [`i128::from_ne_bytes`]
2672 - [`isize::to_be_bytes`]
2673 - [`isize::to_le_bytes`]
2674 - [`isize::to_ne_bytes`]
2675 - [`isize::from_be_bytes`]
2676 - [`isize::from_le_bytes`]
2677 - [`isize::from_ne_bytes`]
2678 - [`u8::to_be_bytes`]
2679 - [`u8::to_le_bytes`]
2680 - [`u8::to_ne_bytes`]
2681 - [`u8::from_be_bytes`]
2682 - [`u8::from_le_bytes`]
2683 - [`u8::from_ne_bytes`]
2684 - [`u16::to_be_bytes`]
2685 - [`u16::to_le_bytes`]
2686 - [`u16::to_ne_bytes`]
2687 - [`u16::from_be_bytes`]
2688 - [`u16::from_le_bytes`]
2689 - [`u16::from_ne_bytes`]
2690 - [`u32::to_be_bytes`]
2691 - [`u32::to_le_bytes`]
2692 - [`u32::to_ne_bytes`]
2693 - [`u32::from_be_bytes`]
2694 - [`u32::from_le_bytes`]
2695 - [`u32::from_ne_bytes`]
2696 - [`u64::to_be_bytes`]
2697 - [`u64::to_le_bytes`]
2698 - [`u64::to_ne_bytes`]
2699 - [`u64::from_be_bytes`]
2700 - [`u64::from_le_bytes`]
2701 - [`u64::from_ne_bytes`]
2702 - [`u128::to_be_bytes`]
2703 - [`u128::to_le_bytes`]
2704 - [`u128::to_ne_bytes`]
2705 - [`u128::from_be_bytes`]
2706 - [`u128::from_le_bytes`]
2707 - [`u128::from_ne_bytes`]
2708 - [`usize::to_be_bytes`]
2709 - [`usize::to_le_bytes`]
2710 - [`usize::to_ne_bytes`]
2711 - [`usize::from_be_bytes`]
2712 - [`usize::from_le_bytes`]
2713 - [`usize::from_ne_bytes`]
2717 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2718 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2722 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2726 - [The argument types for AVX's
2727 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2728 been changed from `*const` to `*mut` as the previous implementation
2732 [55148]: https://github.com/rust-lang/rust/pull/55148/
2733 [55238]: https://github.com/rust-lang/rust/pull/55238/
2734 [55280]: https://github.com/rust-lang/rust/pull/55280/
2735 [55610]: https://github.com/rust-lang/rust/pull/55610/
2736 [55663]: https://github.com/rust-lang/rust/pull/55663/
2737 [55702]: https://github.com/rust-lang/rust/pull/55702/
2738 [55837]: https://github.com/rust-lang/rust/pull/55837/
2739 [55843]: https://github.com/rust-lang/rust/pull/55843/
2740 [56072]: https://github.com/rust-lang/rust/pull/56072/
2741 [56245]: https://github.com/rust-lang/rust/pull/56245/
2742 [56365]: https://github.com/rust-lang/rust/pull/56365/
2743 [56366]: https://github.com/rust-lang/rust/pull/56366/
2744 [56395]: https://github.com/rust-lang/rust/pull/56395/
2745 [56759]: https://github.com/rust-lang/rust/pull/56759/
2746 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2747 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2748 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2749 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2750 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2751 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2752 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2753 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2754 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2755 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2756 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2757 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2758 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2759 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2760 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2761 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2762 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2763 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2764 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2765 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2766 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2767 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2768 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2769 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2770 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2771 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2772 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2773 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2774 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2775 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2776 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2777 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2778 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2779 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2780 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2781 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2782 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2783 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2784 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2785 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2786 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2787 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2788 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2789 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2790 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2791 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2792 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2793 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2794 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2795 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2796 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2797 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2798 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2799 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2800 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2801 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2802 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2803 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2804 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2805 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2806 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2807 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2808 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2809 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2810 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2811 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2812 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2813 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2814 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2815 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2816 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2817 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2818 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2819 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2820 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2821 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2822 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2823 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2824 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2825 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2826 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2827 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2828 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2829 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2830 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2831 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2832 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2833 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2834 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2835 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2836 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2837 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2838 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2841 Version 1.31.1 (2018-12-20)
2842 ===========================
2844 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2845 - [Fix broken go-to-definition in RLS][rls/1171]
2846 - [Fix infinite loop on hover in RLS][rls/1170]
2848 [56562]: https://github.com/rust-lang/rust/pull/56562
2849 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2850 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2852 Version 1.31.0 (2018-12-06)
2853 ==========================
2857 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2858 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2859 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2860 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2862 - [You can now define and use `const` functions.][54835] These are currently
2863 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2864 [language reference][const-reference] for what exactly is available.
2865 - [You can now use tool lints, which allow you to scope lints from external
2866 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2867 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2868 a crate, not just in exported functions.][54451]
2869 - [You can now use parentheses in pattern matches.][54497]
2873 - [Updated musl to 1.1.20][54430]
2877 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2878 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2879 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2880 into `Option<&mut T>` using the `From` trait.][53218]
2881 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2886 - [`slice::align_to`]
2887 - [`slice::align_to_mut`]
2888 - [`slice::chunks_exact`]
2889 - [`slice::chunks_exact_mut`]
2890 - [`slice::rchunks`]
2891 - [`slice::rchunks_mut`]
2892 - [`slice::rchunks_exact`]
2893 - [`slice::rchunks_exact_mut`]
2894 - [`Option::replace`]
2898 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2899 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2900 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2902 [52813]: https://github.com/rust-lang/rust/pull/52813/
2903 [53218]: https://github.com/rust-lang/rust/pull/53218/
2904 [53555]: https://github.com/rust-lang/rust/issues/53555/
2905 [54057]: https://github.com/rust-lang/rust/pull/54057/
2906 [54240]: https://github.com/rust-lang/rust/pull/54240/
2907 [54430]: https://github.com/rust-lang/rust/pull/54430/
2908 [54451]: https://github.com/rust-lang/rust/pull/54451/
2909 [54497]: https://github.com/rust-lang/rust/pull/54497/
2910 [54778]: https://github.com/rust-lang/rust/pull/54778/
2911 [54835]: https://github.com/rust-lang/rust/pull/54835/
2912 [54870]: https://github.com/rust-lang/rust/pull/54870/
2913 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2914 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2915 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2916 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2917 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2918 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2919 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2920 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2921 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2922 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2923 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2924 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2925 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2926 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2928 Version 1.30.1 (2018-11-08)
2929 ===========================
2931 - [Fixed overflow ICE in rustdoc][54199]
2932 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2934 [54199]: https://github.com/rust-lang/rust/pull/54199
2935 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2937 Version 1.30.0 (2018-10-25)
2938 ==========================
2942 - [Procedural macros are now available.][52081] These kinds of macros allow for
2943 more powerful code generation. There is a [new chapter available][proc-macros]
2944 in the Rust Programming Language book that goes further in depth.
2945 - [You can now use keywords as identifiers using the raw identifiers
2946 syntax (`r#`),][53236] e.g. `let r#for = true;`
2947 - [Using anonymous parameters in traits is now deprecated with a warning and
2948 will be a hard error in the 2018 edition.][53272]
2949 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2950 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2951 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2952 Previously, using a external crate in a module without a use statement
2953 required `let json = ::serde_json::from_str(foo);` but can now be written
2954 as `let json = serde_json::from_str(foo);`.
2955 - [You can now apply the `#[used]` attribute to static items to prevent the
2956 compiler from optimising them away, even if they appear to be unused,][51363]
2957 e.g. `#[used] static FOO: u32 = 1;`
2958 - [You can now import and reexport macros from other crates with the `use`
2959 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2960 the root module of the crate. If your macro relies on calling other local
2961 macros, it is recommended to export with the
2962 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2964 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2965 using the `vis` specifier.][53370]
2966 - [Non-macro attributes now allow all forms of literals, not just
2967 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2968 write `#[attr(true)]`.
2969 - [You can now specify a function to handle a panic in the Rust runtime with the
2970 `#[panic_handler]` attribute.][51366]
2974 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2975 - [Added the `aarch64-unknown-netbsd` target][53165]
2976 - [Upgraded to LLVM 8.][53611]
2980 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2984 - [`Ipv4Addr::BROADCAST`]
2985 - [`Ipv4Addr::LOCALHOST`]
2986 - [`Ipv4Addr::UNSPECIFIED`]
2987 - [`Ipv6Addr::LOCALHOST`]
2988 - [`Ipv6Addr::UNSPECIFIED`]
2989 - [`Iterator::find_map`]
2991 The following methods are replacement methods for `trim_left`, `trim_right`,
2992 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2994 - [`str::trim_end_matches`]
2996 - [`str::trim_start_matches`]
2997 - [`str::trim_start`]
3001 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3002 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3003 equivalent to calling `rustdoc --error-format=json`.
3004 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3008 - [`rustdoc` allows you to specify what edition to treat your code as with the
3009 `--edition` option.][54057]
3010 - [`rustdoc` now has the `--color` (specify whether to output color) and
3011 `--error-format` (specify error format, e.g. `json`) options.][53003]
3012 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3013 debug symbols.][53774]
3014 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3015 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3017 [50911]: https://github.com/rust-lang/rust/pull/50911/
3018 [51363]: https://github.com/rust-lang/rust/pull/51363/
3019 [51366]: https://github.com/rust-lang/rust/pull/51366/
3020 [52081]: https://github.com/rust-lang/rust/pull/52081/
3021 [53003]: https://github.com/rust-lang/rust/pull/53003/
3022 [53033]: https://github.com/rust-lang/rust/pull/53033/
3023 [53044]: https://github.com/rust-lang/rust/pull/53044/
3024 [53165]: https://github.com/rust-lang/rust/pull/53165/
3025 [53611]: https://github.com/rust-lang/rust/pull/53611/
3026 [53213]: https://github.com/rust-lang/rust/pull/53213/
3027 [53236]: https://github.com/rust-lang/rust/pull/53236/
3028 [53272]: https://github.com/rust-lang/rust/pull/53272/
3029 [53370]: https://github.com/rust-lang/rust/pull/53370/
3030 [53459]: https://github.com/rust-lang/rust/pull/53459/
3031 [53774]: https://github.com/rust-lang/rust/pull/53774/
3032 [53822]: https://github.com/rust-lang/rust/pull/53822/
3033 [54057]: https://github.com/rust-lang/rust/pull/54057/
3034 [54146]: https://github.com/rust-lang/rust/pull/54146/
3035 [54404]: https://github.com/rust-lang/rust/pull/54404/
3036 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3037 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3038 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3039 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3041 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3042 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3043 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3044 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3045 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3046 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3047 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3048 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3049 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3050 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3053 Version 1.29.2 (2018-10-11)
3054 ===========================
3056 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3057 - The `rls-preview` component on the windows-gnu targets has been restored.
3059 [54639]: https://github.com/rust-lang/rust/pull/54639
3062 Version 1.29.1 (2018-09-25)
3063 ===========================
3068 - The standard library's `str::repeat` function contained an out of bounds write
3069 caused by an integer overflow. This has been fixed by deterministically
3070 panicking when an overflow happens.
3072 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3076 Version 1.29.0 (2018-09-13)
3077 ==========================
3081 - [Bumped minimum LLVM version to 5.0.][51899]
3082 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3083 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3084 - [Upgraded to LLVM 7.][51966]
3088 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3089 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3090 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3091 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3093 - [`Cell<T>` now allows `T` to be unsized.][50494]
3094 - [`SocketAddr` is now stable on Redox.][52656]
3099 - [`Iterator::flatten`]
3104 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3105 `--locked` to disable this behavior.
3106 - [`cargo-install` will now allow you to cross compile an install
3107 using `--target`.][cargo/5614]
3108 - [Added the `cargo-fix` subcommand to automatically move project code from
3109 2015 edition to 2018.][cargo/5723]
3110 - [`cargo doc` can now optionally document private types using the
3111 `--document-private-items` flag.][cargo/5543]
3115 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3116 the specified level to that level.][52354] For example `--cap-lints warn`
3117 will demote `deny` and `forbid` lints to `warn`.
3118 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3119 fails and `101` if there is a panic.][52197]
3120 - [A preview of clippy has been made available through rustup.][51122]
3121 You can install the preview with `rustup component add clippy-preview`.
3125 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3126 Use `str::get_unchecked(begin..end)` instead.
3127 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3128 Consider using the `home_dir` function from
3129 https://crates.io/crates/dirs instead.
3130 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3131 - [`cfg` attributes and `--cfg` command line flags are now more
3132 strictly validated.][53893]
3134 [53893]: https://github.com/rust-lang/rust/pull/53893/
3135 [52861]: https://github.com/rust-lang/rust/pull/52861/
3136 [51966]: https://github.com/rust-lang/rust/pull/51966/
3137 [52656]: https://github.com/rust-lang/rust/pull/52656/
3138 [52239]: https://github.com/rust-lang/rust/pull/52239/
3139 [52330]: https://github.com/rust-lang/rust/pull/52330/
3140 [52354]: https://github.com/rust-lang/rust/pull/52354/
3141 [52402]: https://github.com/rust-lang/rust/pull/52402/
3142 [52103]: https://github.com/rust-lang/rust/pull/52103/
3143 [52197]: https://github.com/rust-lang/rust/pull/52197/
3144 [51807]: https://github.com/rust-lang/rust/pull/51807/
3145 [51899]: https://github.com/rust-lang/rust/pull/51899/
3146 [51912]: https://github.com/rust-lang/rust/pull/51912/
3147 [51511]: https://github.com/rust-lang/rust/pull/51511/
3148 [51619]: https://github.com/rust-lang/rust/pull/51619/
3149 [51656]: https://github.com/rust-lang/rust/pull/51656/
3150 [51178]: https://github.com/rust-lang/rust/pull/51178/
3151 [51122]: https://github.com/rust-lang/rust/pull/51122
3152 [50494]: https://github.com/rust-lang/rust/pull/50494/
3153 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3154 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3155 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3156 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3157 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3158 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3159 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3162 Version 1.28.0 (2018-08-02)
3163 ===========================
3167 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3168 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3169 the inner type across Foreign Function Interface (FFI) boundaries.
3170 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3171 and can now be used as identifiers.][51196]
3172 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3173 stable.][51241] This will allow users to specify a global allocator for
3175 - [Unit test functions marked with the `#[test]` attribute can now return
3176 `Result<(), E: Debug>` in addition to `()`.][51298]
3177 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3178 allows macros to easily target lifetimes.
3182 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3183 prioritise making smaller binary sizes. `z` is the same as `s` with the
3184 exception that it does not vectorise loops, which typically results in an even
3186 - [The short error format is now stable.][49546] Specified with
3187 `--error-format=short` this option will provide a more compressed output of
3188 rust error messages.
3189 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3190 - [Reduced the number of allocations in the macro parser.][50855] This can
3191 improve compile times of macro heavy crates on average by 5%.
3195 - [Implemented `Default` for `&mut str`.][51306]
3196 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3197 - [Implemented `Extend` for `()`.][50234]
3198 - [The `Debug` implementation of `time::Duration` should now be more easily
3199 human readable.][50364] Previously a `Duration` of one second would printed as
3200 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3201 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3202 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3203 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3204 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3205 for `PathBuf`.][50170]
3206 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3207 and `Wrapping<i128>`.][50465]
3208 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3209 possible.][51050] This can provide up to a 40% speed increase.
3210 - [Improved error messages when using `format!`.][50610]
3214 - [`Iterator::step_by`]
3215 - [`Path::ancestors`]
3216 - [`SystemTime::UNIX_EPOCH`]
3217 - [`alloc::GlobalAlloc`]
3219 - [`alloc::LayoutErr`]
3222 - [`alloc::alloc_zeroed`]
3223 - [`alloc::dealloc`]
3224 - [`alloc::realloc`]
3225 - [`alloc::handle_alloc_error`]
3226 - [`btree_map::Entry::or_default`]
3227 - [`fmt::Alignment`]
3228 - [`hash_map::Entry::or_default`]
3229 - [`iter::repeat_with`]
3230 - [`num::NonZeroUsize`]
3231 - [`num::NonZeroU128`]
3232 - [`num::NonZeroU16`]
3233 - [`num::NonZeroU32`]
3234 - [`num::NonZeroU64`]
3235 - [`num::NonZeroU8`]
3236 - [`ops::RangeBounds`]
3237 - [`slice::SliceIndex`]
3238 - [`slice::from_mut`]
3239 - [`slice::from_ref`]
3240 - [`{Any + Send + Sync}::downcast_mut`]
3241 - [`{Any + Send + Sync}::downcast_ref`]
3242 - [`{Any + Send + Sync}::is`]
3246 - [Cargo will now no longer allow you to publish crates with build scripts that
3247 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3248 considered to be immutable.
3252 - [The `suggestion_applicability` field in `rustc`'s json output is now
3253 stable.][50486] This will allow dev tools to check whether a code suggestion
3254 would apply to them.
3258 - [Rust will consider trait objects with duplicated constraints to be the same
3259 type as without the duplicated constraint.][51276] For example the below code will
3260 now fail to compile.
3265 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3268 impl Trait + Send + Send {
3269 fn test(&self) { println!("two"); }
3273 [49546]: https://github.com/rust-lang/rust/pull/49546/
3274 [50143]: https://github.com/rust-lang/rust/pull/50143/
3275 [50170]: https://github.com/rust-lang/rust/pull/50170/
3276 [50234]: https://github.com/rust-lang/rust/pull/50234/
3277 [50265]: https://github.com/rust-lang/rust/pull/50265/
3278 [50364]: https://github.com/rust-lang/rust/pull/50364/
3279 [50385]: https://github.com/rust-lang/rust/pull/50385/
3280 [50465]: https://github.com/rust-lang/rust/pull/50465/
3281 [50486]: https://github.com/rust-lang/rust/pull/50486/
3282 [50554]: https://github.com/rust-lang/rust/pull/50554/
3283 [50610]: https://github.com/rust-lang/rust/pull/50610/
3284 [50855]: https://github.com/rust-lang/rust/pull/50855/
3285 [51050]: https://github.com/rust-lang/rust/pull/51050/
3286 [51196]: https://github.com/rust-lang/rust/pull/51196/
3287 [51200]: https://github.com/rust-lang/rust/pull/51200/
3288 [51241]: https://github.com/rust-lang/rust/pull/51241/
3289 [51276]: https://github.com/rust-lang/rust/pull/51276/
3290 [51298]: https://github.com/rust-lang/rust/pull/51298/
3291 [51306]: https://github.com/rust-lang/rust/pull/51306/
3292 [51562]: https://github.com/rust-lang/rust/pull/51562/
3293 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3294 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3295 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3296 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3297 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3298 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3299 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3300 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3301 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3302 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3303 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3304 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3305 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3306 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3307 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3308 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3309 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3310 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3311 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3312 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3313 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3314 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3315 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3316 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3317 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3318 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3319 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3320 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3321 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3322 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3324 Version 1.27.2 (2018-07-20)
3325 ===========================
3330 - The borrow checker was fixed to avoid potential unsoundness when using
3331 match ergonomics: [#52213][52213].
3333 [52213]: https://github.com/rust-lang/rust/issues/52213
3335 Version 1.27.1 (2018-07-10)
3336 ===========================
3341 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3342 when running, which enabled executing code as some other user on a
3343 given machine. This release fixes that vulnerability; you can read
3344 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3346 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3351 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3352 match ergonomics: [#51415][51415], [#49534][49534].
3354 [51415]: https://github.com/rust-lang/rust/issues/51415
3355 [49534]: https://github.com/rust-lang/rust/issues/49534
3356 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3357 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3359 Version 1.27.0 (2018-06-21)
3360 ==========================
3364 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3365 be used as an identifier.
3366 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3367 bare `Trait` syntax, and should make it clearer when being used in tandem with
3368 `impl Trait` because it is equivalent to the following syntax:
3369 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3370 `Box<Trait> == Box<dyn Trait>`.
3371 - [Attributes on generic parameters such as types and lifetimes are
3372 now stable.][48851] e.g.
3373 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3374 - [The `#[must_use]` attribute can now also be used on functions as well as
3375 types.][48925] It provides a lint that by default warns users when the
3376 value returned by a function has not been used.
3380 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3384 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3385 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3386 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3387 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3388 the `cfg` attribute.
3389 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3390 std are now available in core.][49896]
3391 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3393 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3394 that the operation isn't done in place.
3395 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3396 the `#[must_use]` attribute][49533] to warn about unused potentially
3397 expensive allocations.
3401 - [`DoubleEndedIterator::rfind`]
3402 - [`DoubleEndedIterator::rfold`]
3403 - [`DoubleEndedIterator::try_rfold`]
3404 - [`Duration::from_micros`]
3405 - [`Duration::from_nanos`]
3406 - [`Duration::subsec_micros`]
3407 - [`Duration::subsec_millis`]
3408 - [`HashMap::remove_entry`]
3409 - [`Iterator::try_fold`]
3410 - [`Iterator::try_for_each`]
3412 - [`Option::filter`]
3413 - [`String::replace_range`]
3414 - [`Take::set_limit`]
3415 - [`hint::unreachable_unchecked`]
3416 - [`os::unix::process::parent_id`]
3417 - [`ptr::swap_nonoverlapping`]
3418 - [`slice::rsplit_mut`]
3420 - [`slice::swap_with_slice`]
3424 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3425 `readme`, and `repository` fields.][cargo/5386]
3426 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3427 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3428 a different directory than `target` for placing compilation artifacts.
3429 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3430 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3431 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3432 where cargo would infer a binary, Cargo will produce a warning. You can
3433 disable this feature ahead of time by setting any of the following to false:
3434 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3435 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3436 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3440 - [Added “The Rustc book” into the official documentation.][49707]
3441 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3442 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3446 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3447 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3448 compile, `"".is_empty()` will still compile.
3449 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3450 will only print the inner type.][48553] E.g.
3451 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3452 not `AtomicBool(true)`.
3453 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3454 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3455 alignment should cover all use cases.
3456 - The `.description()` method on the `std::error::Error` trait
3457 [has been soft-deprecated][50163]. It is no longer required to implement it.
3459 [48553]: https://github.com/rust-lang/rust/pull/48553/
3460 [48851]: https://github.com/rust-lang/rust/pull/48851/
3461 [48925]: https://github.com/rust-lang/rust/pull/48925/
3462 [49533]: https://github.com/rust-lang/rust/pull/49533/
3463 [49623]: https://github.com/rust-lang/rust/pull/49623/
3464 [49630]: https://github.com/rust-lang/rust/pull/49630/
3465 [49664]: https://github.com/rust-lang/rust/pull/49664/
3466 [49699]: https://github.com/rust-lang/rust/pull/49699/
3467 [49707]: https://github.com/rust-lang/rust/pull/49707/
3468 [49719]: https://github.com/rust-lang/rust/pull/49719/
3469 [49896]: https://github.com/rust-lang/rust/pull/49896/
3470 [49968]: https://github.com/rust-lang/rust/pull/49968/
3471 [50163]: https://github.com/rust-lang/rust/pull/50163
3472 [50177]: https://github.com/rust-lang/rust/pull/50177/
3473 [50378]: https://github.com/rust-lang/rust/pull/50378/
3474 [50398]: https://github.com/rust-lang/rust/pull/50398/
3475 [50423]: https://github.com/rust-lang/rust/pull/50423/
3476 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3477 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3478 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3479 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3480 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3481 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3482 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3483 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3484 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3485 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3486 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3487 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3488 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3489 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3490 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3491 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3492 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3493 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3494 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3495 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3496 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3497 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3498 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3499 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3500 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3501 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3502 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3503 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3504 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3505 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3508 Version 1.26.2 (2018-06-05)
3509 ==========================
3514 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3516 [51117]: https://github.com/rust-lang/rust/issues/51117
3519 Version 1.26.1 (2018-05-29)
3520 ==========================
3525 - [RLS now works on Windows.][50646]
3526 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3532 - [`fn main() -> impl Trait` no longer works for non-Termination
3534 This reverts an accidental stabilization.
3535 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3536 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3538 [50646]: https://github.com/rust-lang/rust/issues/50646
3539 [50656]: https://github.com/rust-lang/rust/pull/50656
3540 [50812]: https://github.com/rust-lang/rust/pull/50812
3541 [50950]: https://github.com/rust-lang/rust/issues/50950
3542 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3544 Version 1.26.0 (2018-05-10)
3545 ==========================
3549 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3550 implement either or both traits.][49299]
3551 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3552 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3553 lifetime can be elided.][49458]
3554 - [`impl Trait` is now stable allowing you to have abstract types in returns
3555 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3556 `fn open(path: impl AsRef<Path>)`.
3557 - [Pattern matching will now automatically apply dereferences.][49394]
3558 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3559 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3560 - [A lot of operations are now available in a const context.][46882] E.g. You
3561 can now index into constant arrays, reference and dereference into constants,
3562 and use tuple struct constructors.
3563 - [Fixed entry slice patterns are now stable.][48516] E.g.
3565 let points = [1, 2, 3, 4];
3567 [1, 2, 3, 4] => println!("All points were sequential."),
3568 _ => println!("Not all points were sequential."),
3575 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3576 - [Fixed exponential projection complexity on nested types.][48296]
3577 This can provide up to a ~12% reduction in compile times for certain crates.
3578 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3579 to remap path prefixes outputted by the compiler.
3580 - [Added `powerpc-unknown-netbsd` target.][48281]
3584 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3585 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3586 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3587 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3588 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3589 - [`ascii::escape_default` is now available in libcore.][48735]
3590 - [Trailing commas are now supported in std and core macros.][48056]
3591 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3592 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3597 - [`*const T::copy_to_nonoverlapping`]
3598 - [`*const T::copy_to`]
3599 - [`*const T::read_unaligned`]
3600 - [`*const T::read_volatile`]
3601 - [`*const T::read`]
3603 - [`*const T::wrapping_add`]
3604 - [`*const T::wrapping_sub`]
3606 - [`*mut T::copy_to_nonoverlapping`]
3607 - [`*mut T::copy_to`]
3608 - [`*mut T::read_unaligned`]
3609 - [`*mut T::read_volatile`]
3611 - [`*mut T::replace`]
3614 - [`*mut T::wrapping_add`]
3615 - [`*mut T::wrapping_sub`]
3616 - [`*mut T::write_bytes`]
3617 - [`*mut T::write_unaligned`]
3618 - [`*mut T::write_volatile`]
3621 - [`FromUtf8Error::as_bytes`]
3622 - [`LocalKey::try_with`]
3623 - [`Option::cloned`]
3624 - [`btree_map::Entry::and_modify`]
3625 - [`fs::read_to_string`]
3628 - [`hash_map::Entry::and_modify`]
3629 - [`iter::FusedIterator`]
3630 - [`ops::RangeInclusive`]
3631 - [`ops::RangeToInclusive`]
3633 - [`slice::rotate_left`]
3634 - [`slice::rotate_right`]
3635 - [`String::retain`]
3640 - [Cargo will now output path to custom commands when `-v` is
3641 passed with `--list`][cargo/5041]
3642 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3646 - [The second edition of "The Rust Programming Language" book is now recommended
3647 over the first.][48404]
3652 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3653 syntax is now invalid.
3655 use std::ops::Fn as dyn;
3656 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3658 - [The result of dereferences are no longer promoted to `'static`.][47408]
3662 const PAIR: &(i32, i32) = &(0, 1);
3663 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3666 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3667 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3669 - [Removed hoedown from rustdoc.][48274]
3670 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3672 [46882]: https://github.com/rust-lang/rust/pull/46882
3673 [47379]: https://github.com/rust-lang/rust/pull/47379
3674 [47408]: https://github.com/rust-lang/rust/pull/47408
3675 [47813]: https://github.com/rust-lang/rust/pull/47813
3676 [48056]: https://github.com/rust-lang/rust/pull/48056
3677 [48125]: https://github.com/rust-lang/rust/pull/48125
3678 [48166]: https://github.com/rust-lang/rust/pull/48166
3679 [48235]: https://github.com/rust-lang/rust/pull/48235
3680 [48274]: https://github.com/rust-lang/rust/pull/48274
3681 [48281]: https://github.com/rust-lang/rust/pull/48281
3682 [48296]: https://github.com/rust-lang/rust/pull/48296
3683 [48326]: https://github.com/rust-lang/rust/pull/48326
3684 [48359]: https://github.com/rust-lang/rust/pull/48359
3685 [48404]: https://github.com/rust-lang/rust/pull/48404
3686 [48481]: https://github.com/rust-lang/rust/pull/48481
3687 [48516]: https://github.com/rust-lang/rust/pull/48516
3688 [48628]: https://github.com/rust-lang/rust/pull/48628
3689 [48629]: https://github.com/rust-lang/rust/pull/48629
3690 [48657]: https://github.com/rust-lang/rust/pull/48657
3691 [48735]: https://github.com/rust-lang/rust/pull/48735
3692 [48978]: https://github.com/rust-lang/rust/pull/48978
3693 [49101]: https://github.com/rust-lang/rust/pull/49101
3694 [49109]: https://github.com/rust-lang/rust/pull/49109
3695 [49121]: https://github.com/rust-lang/rust/pull/49121
3696 [49162]: https://github.com/rust-lang/rust/pull/49162
3697 [49184]: https://github.com/rust-lang/rust/pull/49184
3698 [49234]: https://github.com/rust-lang/rust/pull/49234
3699 [49255]: https://github.com/rust-lang/rust/pull/49255
3700 [49299]: https://github.com/rust-lang/rust/pull/49299
3701 [49305]: https://github.com/rust-lang/rust/pull/49305
3702 [49394]: https://github.com/rust-lang/rust/pull/49394
3703 [49458]: https://github.com/rust-lang/rust/pull/49458
3704 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3705 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3706 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3707 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3708 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3709 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3710 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3711 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3712 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3713 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3714 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3715 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3716 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3717 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3718 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3719 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3720 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3721 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3722 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3723 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3724 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3725 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3726 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3727 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3728 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3729 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3730 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3731 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3732 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3733 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3734 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3735 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3736 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3737 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3738 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3739 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3740 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3741 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3742 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3743 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3744 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3745 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3748 Version 1.25.0 (2018-03-29)
3749 ==========================
3753 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3754 - [You can now use nested groups of imports.][47948]
3755 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3756 - [You can now have `|` at the start of a match arm.][47947] e.g.
3758 enum Foo { A, B, C }
3764 | Foo::B => println!("AB"),
3765 | Foo::C => println!("C"),
3772 - [Upgraded to LLVM 6.][47828]
3773 - [Added `-C lto=val` option.][47521]
3774 - [Added `i586-unknown-linux-musl` target][47282]
3778 - [Impl Send for `process::Command` on Unix.][47760]
3779 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3780 - [`UnsafeCell::into_inner` is now safe.][47204]
3781 - [Implement libstd for CloudABI.][47268]
3782 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3783 - [Implement `AsRef<Path>` for Component][46985]
3784 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3785 - [Moved `Duration` to libcore.][46666]
3789 - [`Location::column`]
3792 The following functions can now be used in a constant expression.
3793 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3794 - [`Duration::new`][47300]
3795 - [`Duration::from_secs`][47300]
3796 - [`Duration::from_millis`][47300]
3800 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3801 - [`cargo new` now defaults to creating a binary crate, instead of a
3802 library crate.][cargo/5029]
3806 - [Rust by example is now shipped with new releases][46196]
3810 - [Deprecated `net::lookup_host`.][47510]
3811 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3812 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3813 around indexing operations (see [#47349][47349]). This has been fixed (which also
3814 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3815 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3817 [33903]: https://github.com/rust-lang/rust/pull/33903
3818 [47947]: https://github.com/rust-lang/rust/pull/47947
3819 [47948]: https://github.com/rust-lang/rust/pull/47948
3820 [47760]: https://github.com/rust-lang/rust/pull/47760
3821 [47790]: https://github.com/rust-lang/rust/pull/47790
3822 [47828]: https://github.com/rust-lang/rust/pull/47828
3823 [47398]: https://github.com/rust-lang/rust/pull/47398
3824 [47510]: https://github.com/rust-lang/rust/pull/47510
3825 [47521]: https://github.com/rust-lang/rust/pull/47521
3826 [47204]: https://github.com/rust-lang/rust/pull/47204
3827 [47251]: https://github.com/rust-lang/rust/pull/47251
3828 [47268]: https://github.com/rust-lang/rust/pull/47268
3829 [47282]: https://github.com/rust-lang/rust/pull/47282
3830 [47300]: https://github.com/rust-lang/rust/pull/47300
3831 [47349]: https://github.com/rust-lang/rust/pull/47349
3832 [46931]: https://github.com/rust-lang/rust/pull/46931
3833 [46985]: https://github.com/rust-lang/rust/pull/46985
3834 [47006]: https://github.com/rust-lang/rust/pull/47006
3835 [46830]: https://github.com/rust-lang/rust/pull/46830
3836 [46095]: https://github.com/rust-lang/rust/pull/46095
3837 [46666]: https://github.com/rust-lang/rust/pull/46666
3838 [46196]: https://github.com/rust-lang/rust/pull/46196
3839 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3840 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3841 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3842 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3843 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3846 Version 1.24.1 (2018-03-01)
3847 ==========================
3849 - [Do not abort when unwinding through FFI][48251]
3850 - [Emit UTF-16 files for linker arguments on Windows][48318]
3851 - [Make the error index generator work again][48308]
3852 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3854 [48251]: https://github.com/rust-lang/rust/issues/48251
3855 [48308]: https://github.com/rust-lang/rust/issues/48308
3856 [48318]: https://github.com/rust-lang/rust/issues/48318
3857 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3860 Version 1.24.0 (2018-02-15)
3861 ==========================
3865 - [External `sysv64` ffi is now available.][46528]
3866 eg. `extern "sysv64" fn foo () {}`
3870 - [rustc now uses 16 codegen units by default for release builds.][46910]
3871 For the fastest builds, utilize `codegen-units=1`.
3872 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3873 - [Add `aarch64-unknown-openbsd` support][46760]
3877 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3878 improvement in performance in the majority of cases.
3879 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3880 with Windows.][46798]
3881 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3882 - [impl `From<bool>` for `AtomicBool`][46293]
3883 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3884 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3885 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3886 - [float::from_bits now just uses transmute.][46012] This provides
3887 some optimisations from LLVM.
3888 - [Copied `AsciiExt` methods onto `char`][46077]
3889 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3890 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3891 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3892 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3896 - [`RefCell::replace`]
3898 - [`atomic::spin_loop_hint`]
3900 The following functions can now be used in a constant expression.
3901 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3903 - [`AtomicBool::new`][46287]
3904 - [`AtomicUsize::new`][46287]
3905 - [`AtomicIsize::new`][46287]
3906 - [`AtomicPtr::new`][46287]
3907 - [`Cell::new`][46287]
3908 - [`{integer}::min_value`][46287]
3909 - [`{integer}::max_value`][46287]
3910 - [`mem::size_of`][46287]
3911 - [`mem::align_of`][46287]
3912 - [`ptr::null`][46287]
3913 - [`ptr::null_mut`][46287]
3914 - [`RefCell::new`][46287]
3915 - [`UnsafeCell::new`][46287]
3919 - [Added a `workspace.default-members` config that
3920 overrides implied `--all` in virtual workspaces.][cargo/4743]
3921 - [Enable incremental by default on development builds.][cargo/4817] Also added
3922 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3923 per-project or global basis respectively.
3930 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3931 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3932 in accordance with IETF RFC 4291 §2.2.
3933 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3934 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3935 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3936 - [Leading zeros in tuple struct members is now an error][47084]
3937 - [`column!()` macro is one-based instead of zero-based][46977]
3938 - [`fmt::Arguments` can no longer be shared across threads][45198]
3939 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3940 - [Cargo sets a different working directory for the compiler][cargo/4788]
3942 [44884]: https://github.com/rust-lang/rust/pull/44884
3943 [45198]: https://github.com/rust-lang/rust/pull/45198
3944 [45506]: https://github.com/rust-lang/rust/pull/45506
3945 [45904]: https://github.com/rust-lang/rust/pull/45904
3946 [45990]: https://github.com/rust-lang/rust/pull/45990
3947 [46012]: https://github.com/rust-lang/rust/pull/46012
3948 [46077]: https://github.com/rust-lang/rust/pull/46077
3949 [46094]: https://github.com/rust-lang/rust/pull/46094
3950 [46284]: https://github.com/rust-lang/rust/pull/46284
3951 [46287]: https://github.com/rust-lang/rust/pull/46287
3952 [46293]: https://github.com/rust-lang/rust/pull/46293
3953 [46528]: https://github.com/rust-lang/rust/pull/46528
3954 [46671]: https://github.com/rust-lang/rust/pull/46671
3955 [46713]: https://github.com/rust-lang/rust/pull/46713
3956 [46735]: https://github.com/rust-lang/rust/pull/46735
3957 [46749]: https://github.com/rust-lang/rust/pull/46749
3958 [46760]: https://github.com/rust-lang/rust/pull/46760
3959 [46798]: https://github.com/rust-lang/rust/pull/46798
3960 [46828]: https://github.com/rust-lang/rust/pull/46828
3961 [46831]: https://github.com/rust-lang/rust/pull/46831
3962 [46833]: https://github.com/rust-lang/rust/pull/46833
3963 [46910]: https://github.com/rust-lang/rust/pull/46910
3964 [46977]: https://github.com/rust-lang/rust/pull/46977
3965 [47018]: https://github.com/rust-lang/rust/pull/47018
3966 [47080]: https://github.com/rust-lang/rust/pull/47080
3967 [47084]: https://github.com/rust-lang/rust/pull/47084
3968 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3969 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3970 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3971 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3972 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3973 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3976 Version 1.23.0 (2018-01-04)
3977 ==========================
3981 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3982 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3983 Which should fix some confusing errors in some operations.
3987 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3988 undefined behavior.][45920]
3989 - [rustc now suggests renaming import if names clash.][45660]
3990 - [Display errors/warnings correctly when there are zero-width or
3991 wide characters.][45711]
3992 - [rustc now avoids unnecessary copies of arguments that are
3993 simple bindings][45380] This should improve memory usage on average by 5-10%.
3994 - [Updated musl used to build musl rustc to 1.1.17][45393]
3998 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3999 - [Implement Hash for raw pointers to unsized types][45483]
4000 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4001 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4002 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4003 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4004 and `<*mut T>::as_mut`][44932]
4005 - [Optimized `Thread::{park, unpark}` implementation][45524]
4006 - [Improved `SliceExt::binary_search` performance.][45333]
4007 - [impl `FromIterator<()>` for `()`][45379]
4008 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4016 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4017 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4018 - [Added unit test checking to `cargo check`][cargo/4592]
4019 - [Cargo now lets you install a specific version
4020 using `cargo install --version`][cargo/4637]
4024 - [Releases now ship with the Cargo book documentation.][45692]
4025 - [rustdoc now prints rendering warnings on every run.][45324]
4029 - [Changes have been made to type equality to make it more correct,
4030 in rare cases this could break some code.][45853] [Tracking issue for
4031 further information][45852]
4032 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4033 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4034 Android 9, the minimum supported version is Android 14.
4035 - [Bumped the minimum LLVM to 3.9][45326]
4037 [44042]: https://github.com/rust-lang/rust/pull/44042
4038 [44932]: https://github.com/rust-lang/rust/pull/44932
4039 [45267]: https://github.com/rust-lang/rust/pull/45267
4040 [45324]: https://github.com/rust-lang/rust/pull/45324
4041 [45326]: https://github.com/rust-lang/rust/pull/45326
4042 [45333]: https://github.com/rust-lang/rust/pull/45333
4043 [45379]: https://github.com/rust-lang/rust/pull/45379
4044 [45380]: https://github.com/rust-lang/rust/pull/45380
4045 [45393]: https://github.com/rust-lang/rust/pull/45393
4046 [45435]: https://github.com/rust-lang/rust/pull/45435
4047 [45483]: https://github.com/rust-lang/rust/pull/45483
4048 [45524]: https://github.com/rust-lang/rust/pull/45524
4049 [45571]: https://github.com/rust-lang/rust/pull/45571
4050 [45580]: https://github.com/rust-lang/rust/pull/45580
4051 [45610]: https://github.com/rust-lang/rust/pull/45610
4052 [45660]: https://github.com/rust-lang/rust/pull/45660
4053 [45692]: https://github.com/rust-lang/rust/pull/45692
4054 [45711]: https://github.com/rust-lang/rust/pull/45711
4055 [45772]: https://github.com/rust-lang/rust/pull/45772
4056 [45852]: https://github.com/rust-lang/rust/issues/45852
4057 [45853]: https://github.com/rust-lang/rust/pull/45853
4058 [45887]: https://github.com/rust-lang/rust/pull/45887
4059 [45920]: https://github.com/rust-lang/rust/pull/45920
4060 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4061 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4062 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4065 Version 1.22.1 (2017-11-22)
4066 ==========================
4068 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4070 [46183]: https://github.com/rust-lang/rust/pull/46183
4072 Version 1.22.0 (2017-11-22)
4073 ==========================
4077 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4078 - [Now accepts underscores in unicode escapes][43716]
4079 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4080 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4084 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4085 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4086 This should decrease compile times for debug builds.
4087 - [strict memory alignment now enabled on ARMv6][45094]
4088 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4092 - [Allow atomic operations up to 32 bits
4093 on `armv5te_unknown_linux_gnueabi`][44978]
4094 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4095 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4096 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4097 - [Properly detect overflow in `Instant += Duration`.][44220]
4098 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4099 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4100 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4107 - [Cargo will now build multi file examples in subdirectories of the `examples`
4108 folder that have a `main.rs` file.][cargo/4496]
4109 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4110 the old format will continue to work and can be updated with `cargo update`.
4111 - [Now supports vendoring git repositories][cargo/3992]
4115 - [`libbacktrace` is now available on Apple platforms.][44251]
4116 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4117 This now lets you specify that a given code example will fail to compile.
4121 - [The minimum Android version that rustc can build for has been bumped
4122 to `4.0` from `2.3`][45656]
4123 - [Allowing `T op= &T` for numeric types has broken some type
4124 inference cases][45480]
4127 [42526]: https://github.com/rust-lang/rust/pull/42526
4128 [43017]: https://github.com/rust-lang/rust/pull/43017
4129 [43716]: https://github.com/rust-lang/rust/pull/43716
4130 [43949]: https://github.com/rust-lang/rust/pull/43949
4131 [44015]: https://github.com/rust-lang/rust/pull/44015
4132 [44220]: https://github.com/rust-lang/rust/pull/44220
4133 [44251]: https://github.com/rust-lang/rust/pull/44251
4134 [44287]: https://github.com/rust-lang/rust/pull/44287
4135 [44303]: https://github.com/rust-lang/rust/pull/44303
4136 [44456]: https://github.com/rust-lang/rust/pull/44456
4137 [44466]: https://github.com/rust-lang/rust/pull/44466
4138 [44895]: https://github.com/rust-lang/rust/pull/44895
4139 [44966]: https://github.com/rust-lang/rust/pull/44966
4140 [44978]: https://github.com/rust-lang/rust/pull/44978
4141 [45041]: https://github.com/rust-lang/rust/pull/45041
4142 [45064]: https://github.com/rust-lang/rust/pull/45064
4143 [45075]: https://github.com/rust-lang/rust/pull/45075
4144 [45094]: https://github.com/rust-lang/rust/pull/45094
4145 [45095]: https://github.com/rust-lang/rust/pull/45095
4146 [45480]: https://github.com/rust-lang/rust/issues/45480
4147 [45656]: https://github.com/rust-lang/rust/pull/45656
4148 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4149 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4150 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4157 Version 1.21.0 (2017-10-12)
4158 ==========================
4162 - [You can now use static references for literals.][43838]
4166 let x: &'static u32 = &0;
4169 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4172 my_macro!(Vec<i32>::new); // Always worked
4173 my_macro!(Vec::<i32>::new); // Now works
4178 - [Upgraded jemalloc to 4.5.0][43911]
4179 - [Enabled unwinding panics on Redox][43917]
4180 - [Now runs LLVM in parallel during translation phase.][43506]
4181 This should reduce peak memory usage.
4185 - [Generate builtin impls for `Clone` for all arrays and tuples that
4186 are `T: Clone`][43690]
4187 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4188 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4189 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4194 [`std::mem::discriminant`]
4198 - [You can now call `cargo install` with multiple package names][cargo/4216]
4199 - [Cargo commands inside a virtual workspace will now implicitly
4200 pass `--all`][cargo/4335]
4201 - [Added a `[patch]` section to `Cargo.toml` to handle
4202 prepublication dependencies][cargo/4123] [RFC 1969]
4203 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4204 like patterns][cargo/4270]
4205 - [Added the `--all-targets` option][cargo/4400]
4206 - [Using required dependencies as a feature is now deprecated and emits
4207 a warning][cargo/4364]
4212 - [Cargo docs are moving][43916]
4213 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4214 - [The rustdoc book is now available][43863]
4215 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4216 - [Added a preview of RLS has been made available through rustup][44204]
4217 Install with `rustup component add rls-preview`
4218 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4219 Previously only showed `std::os::unix`.
4223 - [Changes in method matching against higher-ranked types][43880] This may cause
4224 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4225 - [rustc's JSON error output's byte position start at top of file.][42973]
4226 Was previously relative to the rustc's internal `CodeMap` struct which
4227 required the unstable library `libsyntax` to correctly use.
4228 - [`unused_results` lint no longer ignores booleans][43728]
4230 [42565]: https://github.com/rust-lang/rust/pull/42565
4231 [42973]: https://github.com/rust-lang/rust/pull/42973
4232 [43348]: https://github.com/rust-lang/rust/pull/43348
4233 [43459]: https://github.com/rust-lang/rust/pull/43459
4234 [43506]: https://github.com/rust-lang/rust/pull/43506
4235 [43540]: https://github.com/rust-lang/rust/pull/43540
4236 [43690]: https://github.com/rust-lang/rust/pull/43690
4237 [43728]: https://github.com/rust-lang/rust/pull/43728
4238 [43838]: https://github.com/rust-lang/rust/pull/43838
4239 [43863]: https://github.com/rust-lang/rust/pull/43863
4240 [43880]: https://github.com/rust-lang/rust/pull/43880
4241 [43911]: https://github.com/rust-lang/rust/pull/43911
4242 [43916]: https://github.com/rust-lang/rust/pull/43916
4243 [43917]: https://github.com/rust-lang/rust/pull/43917
4244 [44204]: https://github.com/rust-lang/rust/pull/44204
4245 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4246 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4247 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4248 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4249 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4250 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4251 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4252 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4253 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4255 Version 1.20.0 (2017-08-31)
4256 ===========================
4260 - [Associated constants are now stabilised.][42809]
4261 - [A lot of macro bugs are now fixed.][42913]
4266 - [Struct fields are now properly coerced to the expected field type.][42807]
4267 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4268 `wasm32-experimental-emscripten` target.
4269 - [Changed some of the error messages to be more helpful.][42033]
4270 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4272 - [rustc now reports the total number of errors on compilation failure][43015]
4273 previously this was only the number of errors in the pass that failed.
4274 - [Expansion in rustc has been sped up 29x.][42533]
4275 - [added `msp430-none-elf` target.][43099]
4276 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4278 - [Fixes backtraces on Redox][43228]
4279 - [rustc now identifies different versions of same crate when absolute paths of
4280 different types match in an error message.][42826]
4286 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4287 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4289 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4290 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4291 - [Impl `Clone` for `DefaultHasher`.][42799]
4292 - [Impl `Sync` for `SyncSender`.][42397]
4293 - [Impl `FromStr` for `char`][42271]
4294 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4296 - [allow messages in the `unimplemented!()` macro.][42155]
4297 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4298 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4299 - [Upgrade to Unicode 10.0.0][42999]
4300 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4301 - [Skip the main thread's manual stack guard on Linux][43072]
4302 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4303 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4305 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4310 - [`CStr::into_c_string`]
4311 - [`CString::as_c_str`]
4312 - [`CString::into_boxed_c_str`]
4313 - [`Chain::get_mut`]
4314 - [`Chain::get_ref`]
4315 - [`Chain::into_inner`]
4316 - [`Option::get_or_insert_with`]
4317 - [`Option::get_or_insert`]
4318 - [`OsStr::into_os_string`]
4319 - [`OsString::into_boxed_os_str`]
4322 - [`Utf8Error::error_len`]
4323 - [`char::EscapeDebug`]
4324 - [`char::escape_debug`]
4325 - [`compile_error!`]
4326 - [`f32::from_bits`]
4328 - [`f64::from_bits`]
4330 - [`mem::ManuallyDrop`]
4331 - [`slice::sort_unstable_by_key`]
4332 - [`slice::sort_unstable_by`]
4333 - [`slice::sort_unstable`]
4334 - [`str::from_boxed_utf8_unchecked`]
4335 - [`str::as_bytes_mut`]
4336 - [`str::as_bytes_mut`]
4337 - [`str::from_utf8_mut`]
4338 - [`str::from_utf8_unchecked_mut`]
4340 - [`str::get_unchecked_mut`]
4341 - [`str::get_unchecked`]
4343 - [`str::into_boxed_bytes`]
4348 - [Cargo API token location moved from `~/.cargo/config` to
4349 `~/.cargo/credentials`.][cargo/3978]
4350 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4351 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4352 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4353 - [You can now specify version of a binary when installed through
4354 `cargo install` using `--vers`.][cargo/4229]
4355 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4356 failure.][cargo/4248]
4357 - [Changed the convention around which file is the crate root.][cargo/4259]
4358 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4359 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4364 - [Functions with `'static` in their return types will now not be as usable as
4365 if they were using lifetime parameters instead.][42417]
4366 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4367 takes the sign of NaN into account where previously didn't.][42430]
4369 [42033]: https://github.com/rust-lang/rust/pull/42033
4370 [42155]: https://github.com/rust-lang/rust/pull/42155
4371 [42271]: https://github.com/rust-lang/rust/pull/42271
4372 [42397]: https://github.com/rust-lang/rust/pull/42397
4373 [42417]: https://github.com/rust-lang/rust/pull/42417
4374 [42430]: https://github.com/rust-lang/rust/pull/42430
4375 [42431]: https://github.com/rust-lang/rust/pull/42431
4376 [42533]: https://github.com/rust-lang/rust/pull/42533
4377 [42571]: https://github.com/rust-lang/rust/pull/42571
4378 [42613]: https://github.com/rust-lang/rust/pull/42613
4379 [42799]: https://github.com/rust-lang/rust/pull/42799
4380 [42807]: https://github.com/rust-lang/rust/pull/42807
4381 [42809]: https://github.com/rust-lang/rust/pull/42809
4382 [42822]: https://github.com/rust-lang/rust/pull/42822
4383 [42826]: https://github.com/rust-lang/rust/pull/42826
4384 [42854]: https://github.com/rust-lang/rust/pull/42854
4385 [42913]: https://github.com/rust-lang/rust/pull/42913
4386 [42999]: https://github.com/rust-lang/rust/pull/42999
4387 [43011]: https://github.com/rust-lang/rust/pull/43011
4388 [43015]: https://github.com/rust-lang/rust/pull/43015
4389 [43072]: https://github.com/rust-lang/rust/pull/43072
4390 [43077]: https://github.com/rust-lang/rust/pull/43077
4391 [43097]: https://github.com/rust-lang/rust/pull/43097
4392 [43099]: https://github.com/rust-lang/rust/pull/43099
4393 [43170]: https://github.com/rust-lang/rust/pull/43170
4394 [43178]: https://github.com/rust-lang/rust/pull/43178
4395 [43185]: https://github.com/rust-lang/rust/pull/43185
4396 [43228]: https://github.com/rust-lang/rust/pull/43228
4397 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4398 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4399 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4400 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4401 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4402 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4403 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4404 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4405 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4406 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4407 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4408 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4409 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4410 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4411 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4412 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4413 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4414 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4415 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4416 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4417 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4418 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4419 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4420 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4421 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4422 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4423 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4424 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4425 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4426 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4427 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4428 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4429 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4430 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4431 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4432 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4433 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4434 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4435 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4438 Version 1.19.0 (2017-07-20)
4439 ===========================
4444 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4445 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4446 - [Macro recursion limit increased to 1024 from 64.][41676]
4447 - [Added lint for detecting unused macros.][41907]
4448 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4449 For example: `let x = loop { break 7; };`
4450 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4451 contain `Copy` types and cannot have a `Drop` implementation.
4452 Example: `union Foo { bar: u8, baz: usize }`
4453 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4454 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4459 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4460 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4461 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4462 you should use `--target armv7-linux-androideabi`.
4463 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4464 - [Minor optimisation of string operations.][42037]
4465 - [Compiler error message is now `aborting due to previous error(s)` instead of
4466 `aborting due to N previous errors`][42150] This was previously inaccurate and
4467 would only count certain kinds of errors.
4468 - [The compiler now supports Visual Studio 2017][42225]
4469 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4470 - [Added a lot][42264] of [new error codes][42302]
4471 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4472 libraries with C Run-time Libraries(CRT) to be statically linked.
4473 - [Fixed various ARM codegen bugs][42740]
4478 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4479 `Extend<Cow<'a, str>>`][41449]
4480 - [`Vec` now implements `From<&mut [T]>`][41530]
4481 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4482 - [`SplitWhitespace` now implements `Clone`][41659]
4483 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4485 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4486 macros, but for printing to stderr.
4491 - [`OsString::shrink_to_fit`]
4494 - [`thread::ThreadId`]
4499 - [Build scripts can now add environment variables to the environment
4500 the crate is being compiled in.
4501 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4502 - [Subcommands now replace the current process rather than spawning a new
4503 child process][cargo/3970]
4504 - [Workspace members can now accept glob file patterns][cargo/3979]
4505 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4506 the members in a given workspace.][cargo/3988]
4507 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4508 - [Target directory path is now in the cargo metadata][cargo/4022]
4509 - [Cargo no longer checks out a local working directory for the
4510 crates.io index][cargo/4026] This should provide smaller file size for the
4511 registry, and improve cloning times, especially on Windows machines.
4512 - [Added an `--exclude` option for excluding certain packages when using the
4513 `--all` option][cargo/4031]
4514 - [Cargo will now automatically retry when receiving a 5xx error
4515 from crates.io][cargo/4032]
4516 - [The `--features` option now accepts multiple comma or space
4517 delimited values.][cargo/4084]
4518 - [Added support for custom target specific runners][cargo/3954]
4523 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4525 - [Rust will now release XZ compressed packages][rust-installer/57]
4526 - [rustup will now prefer to download rust packages with
4527 XZ compression][rustup/1100] over GZip packages.
4528 - [Added the ability to escape `#` in rust documentation][41785] By adding
4529 additional `#`'s ie. `##` is now `#`
4534 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4535 - [`-Z` flags are now no longer allowed to be used on the stable
4536 compiler.][41751] This has been a warning for a year previous to this.
4537 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4538 longer works][42844]. Users should migrate to the built-in `check`
4539 command, which has been available since 1.16.
4540 - [Ending a float literal with `._` is now a hard error.
4541 Example: `42._` .][41946]
4542 - [Any use of a private `extern crate` outside of its module is now a
4543 hard error.][36886] This was previously a warning.
4544 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4545 relative while the `::` prefix makes a path absolute, but was ignored and the
4546 path was relative regardless.
4547 - [Floating point constants in match patterns is now a hard error][36890]
4548 This was previously a warning.
4549 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4550 match patterns is now a hard error][36891] This was previously a warning.
4551 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4553 - [From the pound escape, lines consisting of multiple `#`s are
4555 - [It is an error to re-export private enum variants][42460]. This is
4556 known to break a number of crates that depend on an older version of
4558 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4559 to use it to find the linker, and the build will fail where it did
4560 not previously][42607]
4562 [36886]: https://github.com/rust-lang/rust/issues/36886
4563 [36888]: https://github.com/rust-lang/rust/issues/36888
4564 [36890]: https://github.com/rust-lang/rust/issues/36890
4565 [36891]: https://github.com/rust-lang/rust/issues/36891
4566 [36892]: https://github.com/rust-lang/rust/issues/36892
4567 [37406]: https://github.com/rust-lang/rust/issues/37406
4568 [39983]: https://github.com/rust-lang/rust/pull/39983
4569 [41145]: https://github.com/rust-lang/rust/pull/41145
4570 [41192]: https://github.com/rust-lang/rust/pull/41192
4571 [41258]: https://github.com/rust-lang/rust/pull/41258
4572 [41370]: https://github.com/rust-lang/rust/pull/41370
4573 [41449]: https://github.com/rust-lang/rust/pull/41449
4574 [41530]: https://github.com/rust-lang/rust/pull/41530
4575 [41624]: https://github.com/rust-lang/rust/pull/41624
4576 [41656]: https://github.com/rust-lang/rust/pull/41656
4577 [41659]: https://github.com/rust-lang/rust/pull/41659
4578 [41676]: https://github.com/rust-lang/rust/pull/41676
4579 [41751]: https://github.com/rust-lang/rust/pull/41751
4580 [41764]: https://github.com/rust-lang/rust/pull/41764
4581 [41785]: https://github.com/rust-lang/rust/pull/41785
4582 [41873]: https://github.com/rust-lang/rust/pull/41873
4583 [41907]: https://github.com/rust-lang/rust/pull/41907
4584 [41946]: https://github.com/rust-lang/rust/pull/41946
4585 [42016]: https://github.com/rust-lang/rust/pull/42016
4586 [42037]: https://github.com/rust-lang/rust/pull/42037
4587 [42068]: https://github.com/rust-lang/rust/pull/42068
4588 [42150]: https://github.com/rust-lang/rust/pull/42150
4589 [42162]: https://github.com/rust-lang/rust/pull/42162
4590 [42225]: https://github.com/rust-lang/rust/pull/42225
4591 [42264]: https://github.com/rust-lang/rust/pull/42264
4592 [42302]: https://github.com/rust-lang/rust/pull/42302
4593 [42460]: https://github.com/rust-lang/rust/issues/42460
4594 [42607]: https://github.com/rust-lang/rust/issues/42607
4595 [42740]: https://github.com/rust-lang/rust/pull/42740
4596 [42844]: https://github.com/rust-lang/rust/issues/42844
4597 [42948]: https://github.com/rust-lang/rust/pull/42948
4598 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4599 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4600 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4601 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4602 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4603 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4604 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4605 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4606 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4607 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4608 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4609 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4610 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4611 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4612 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4613 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4614 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4615 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4616 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4617 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4618 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4619 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4622 Version 1.18.0 (2017-06-08)
4623 ===========================
4628 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4629 make the item visible to just that module tree. Also accepts the keyword
4630 `crate` to make something public to the whole crate but not users of the
4631 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4632 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4633 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4634 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4635 types like `Write + Send`, trailing `+` are now supported in trait objects,
4636 and better error reporting for trait objects starting with `?Sized`.
4637 - [0e+10 is now a valid floating point literal][40589]
4638 - [Now warns if you bind a lifetime parameter to 'static][40734]
4639 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4640 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4641 representation in some cases.][40377]
4646 - [rustc can now emit mir with `--emit mir`][39891]
4647 - [Improved LLVM IR for trivial functions][40367]
4648 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4649 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4650 opportunities found through profiling
4651 - [Improved backtrace formatting when panicking][38165]
4656 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4657 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4658 iteration or reallocation.
4659 - [Simplified HashMap Bucket interface][40561] provides performance
4660 improvements for iterating and cloning.
4661 - [Specialize Vec::from_elem to use calloc][40409]
4662 - [Fixed Race condition in fs::create_dir_all][39799]
4663 - [No longer caching stdio on Windows][40516]
4664 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4665 2.50%~ faster and in one case now 12.50% faster.
4666 - [Optimized `AtomicBool::fetch_nand`][41143]
4671 - [`Child::try_wait`]
4672 - [`HashMap::retain`]
4673 - [`HashSet::retain`]
4675 - [`TcpStream::peek`]
4676 - [`UdpSocket::peek`]
4677 - [`UdpSocket::peek_from`]
4682 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4683 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4684 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4685 - [Added Android build support][cargo/3885]
4686 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4687 of a certain type, for example `cargo build --bins` will build all
4689 - [Added support for haiku][cargo/3952]
4694 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4695 - [Added rust-windbg script for better debugging on Windows][39983]
4696 - [Rust now uses the official cross compiler for NetBSD][40612]
4697 - [rustdoc now accepts `#` at the start of files][40828]
4698 - [Fixed jemalloc support for musl][41168]
4703 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4704 always placed after the sign if it exists and before the digits. With the `#`
4705 flag the zeroes are placed after the prefix and before the digits.
4706 - [Due to the struct field optimisation][40377], using `transmute` on structs
4707 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4708 always been undefined behavior, but is now more likely to break in practice.
4709 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4710 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4711 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4712 - [Overlapping inherent `impl`s are now a hard error][40728]
4713 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4714 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4715 `out.asm` and `out.ll` instead of only one of the filetypes.
4716 - [ calling a function that returns `Self` will no longer work][41805] when
4717 the size of `Self` cannot be statically determined.
4718 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4719 this has caused a few regressions namely:
4721 - Changed the link order of local static/dynamic libraries (respecting the
4722 order on given rather than having the compiler reorder).
4723 - Changed how MinGW is linked, native code linked to dynamic libraries
4724 may require manually linking to the gcc support library (for the native
4727 [38165]: https://github.com/rust-lang/rust/pull/38165
4728 [39799]: https://github.com/rust-lang/rust/pull/39799
4729 [39891]: https://github.com/rust-lang/rust/pull/39891
4730 [39983]: https://github.com/rust-lang/rust/pull/39983
4731 [40043]: https://github.com/rust-lang/rust/pull/40043
4732 [40241]: https://github.com/rust-lang/rust/pull/40241
4733 [40338]: https://github.com/rust-lang/rust/pull/40338
4734 [40367]: https://github.com/rust-lang/rust/pull/40367
4735 [40377]: https://github.com/rust-lang/rust/pull/40377
4736 [40409]: https://github.com/rust-lang/rust/pull/40409
4737 [40516]: https://github.com/rust-lang/rust/pull/40516
4738 [40556]: https://github.com/rust-lang/rust/pull/40556
4739 [40561]: https://github.com/rust-lang/rust/pull/40561
4740 [40589]: https://github.com/rust-lang/rust/pull/40589
4741 [40612]: https://github.com/rust-lang/rust/pull/40612
4742 [40723]: https://github.com/rust-lang/rust/pull/40723
4743 [40728]: https://github.com/rust-lang/rust/pull/40728
4744 [40731]: https://github.com/rust-lang/rust/pull/40731
4745 [40734]: https://github.com/rust-lang/rust/pull/40734
4746 [40805]: https://github.com/rust-lang/rust/pull/40805
4747 [40807]: https://github.com/rust-lang/rust/pull/40807
4748 [40828]: https://github.com/rust-lang/rust/pull/40828
4749 [40870]: https://github.com/rust-lang/rust/pull/40870
4750 [41085]: https://github.com/rust-lang/rust/pull/41085
4751 [41143]: https://github.com/rust-lang/rust/pull/41143
4752 [41168]: https://github.com/rust-lang/rust/pull/41168
4753 [41270]: https://github.com/rust-lang/rust/issues/41270
4754 [41469]: https://github.com/rust-lang/rust/pull/41469
4755 [41805]: https://github.com/rust-lang/rust/issues/41805
4756 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4757 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4758 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4759 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4760 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4761 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4762 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4763 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4764 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4765 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4766 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4767 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4768 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4769 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4772 Version 1.17.0 (2017-04-27)
4773 ===========================
4778 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4779 * [Fields of structs may be initialized without duplicating the field/variable
4780 names][39761]. [RFC 1682]
4781 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4782 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4783 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4784 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4785 `'b`. Soundness fix.
4786 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4787 * [Static variables may contain references to other statics][40027]
4792 * [Exit quickly on only `--emit dep-info`][40336]
4793 * [Make `-C relocation-model` more correctly determine whether the linker
4794 creates a position-independent executable][40245]
4795 * [Add `-C overflow-checks` to directly control whether integer overflow
4797 * [The rustc type checker now checks items on demand instead of in a single
4798 in-order pass][40008]. This is mostly an internal refactoring in support of
4799 future work, including incremental type checking, but also resolves [RFC
4800 1647], allowing `Self` to appear in `impl` `where` clauses.
4801 * [Optimize vtable loads][39995]
4802 * [Turn off vectorization for Emscripten targets][39990]
4803 * [Provide suggestions for unknown macros imported with `use`][39953]
4804 * [Fix ICEs in path resolution][39939]
4805 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4806 * [Add clearer error message using `&str + &str`][39116]
4817 * [`Ordering::then`]
4818 * [`Ordering::then_with`]
4819 * [`BTreeMap::range`]
4820 * [`BTreeMap::range_mut`]
4821 * [`collections::Bound`]
4822 * [`process::abort`]
4823 * [`ptr::read_unaligned`]
4824 * [`ptr::write_unaligned`]
4825 * [`Result::expect_err`]
4828 * [`Cell::into_inner`]
4834 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4835 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4836 * [`String` implements `FromIterator<&char>`][40028]
4837 * `Box` [implements][40009] a number of new conversions:
4838 `From<Box<str>> for String`,
4839 `From<Box<[T]>> for Vec<T>`,
4840 `From<Box<CStr>> for CString`,
4841 `From<Box<OsStr>> for OsString`,
4842 `From<Box<Path>> for PathBuf`,
4843 `Into<Box<str>> for String`,
4844 `Into<Box<[T]>> for Vec<T>`,
4845 `Into<Box<CStr>> for CString`,
4846 `Into<Box<OsStr>> for OsString`,
4847 `Into<Box<Path>> for PathBuf`,
4848 `Default for Box<str>`,
4849 `Default for Box<CStr>`,
4850 `Default for Box<OsStr>`,
4851 `From<&CStr> for Box<CStr>`,
4852 `From<&OsStr> for Box<OsStr>`,
4853 `From<&Path> for Box<Path>`
4854 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4855 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4856 * [Slightly optimize `slice::sort`][39538]
4857 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4858 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4859 `Box<str>` implements `From<&str>`][39438]
4860 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4861 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4862 * [`format!` estimates the needed capacity before writing a string][39356]
4863 * [Support unprivileged symlink creation in Windows][38921]
4864 * [`PathBuf` implements `Default`][38764]
4865 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4866 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4867 and poor hash functions.
4872 * [Add `cargo check --all`][cargo/3731]
4873 * [Add an option to ignore SSL revocation checking][cargo/3699]
4874 * [Add `cargo run --package`][cargo/3691]
4875 * [Add `required_features`][cargo/3667]
4876 * [Assume `build.rs` is a build script][cargo/3664]
4877 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4882 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4884 * [The "Unstable Book" documents nightly-only features][ubook]
4885 * [Improve the style of the sidebar in rustdoc output][40265]
4886 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4887 * [Fix MSP430 breakage due to `i128`][40257]
4888 * [Preliminary Solaris/SPARCv9 support][39903]
4889 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4890 run without installing the MSVC runtime.
4891 * [`rustdoc --test` includes file names in test names][39788]
4892 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4893 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4894 * [Initial support for `aarch64-unknown-freebsd`][39491]
4895 * [Initial support for `i686-unknown-netbsd`][39426]
4896 * [This release no longer includes the old makefile build system][39431]. Rust
4897 is built with a custom build system, written in Rust, and with Cargo.
4898 * [Add Debug implementations for libcollection structs][39002]
4899 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4900 * [`--test-threads=0` produces an error][38945]
4901 * [`rustup` installs documentation by default][40526]
4902 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4903 WinDbg and Visual Studio to improve the debugging experience.
4908 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4909 workaround, either use MSVC 2015 or run vcvars.bat.
4910 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4911 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4912 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4914 * [`format!` and `Display::to_string` panic if an underlying formatting
4915 implementation returns an error][40117]. Previously the error was silently
4916 ignored. It is incorrect for `write_fmt` to return an error when writing
4918 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4919 crates were marked stable and could be accessed from the stable toolchain.
4920 * [Rust git source no longer includes vendored crates][39728]. Those that need
4921 to build with vendored crates should build from release tarballs.
4922 * [Fix inert attributes from `proc_macro_derives`][39572]
4923 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4924 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4926 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4927 existing code generally ignores the type of dead-code unless a type-hint is
4928 provided; this can cause surprising inference interactions particularly around
4929 defaulting. The new code uniformly ignores the result type of dead-code.
4930 * [Tuple-struct constructors with private fields are no longer visible][38932]
4931 * [Lifetime parameters that do not appear in the arguments are now considered
4932 early-bound][38897], resolving a soundness bug (#[32330]). The
4933 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4935 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4936 * [Make transmuting from fn item types to pointer-sized types a hard
4939 [27787]: https://github.com/rust-lang/rust/issues/27787
4940 [32330]: https://github.com/rust-lang/rust/issues/32330
4941 [34198]: https://github.com/rust-lang/rust/pull/34198
4942 [38161]: https://github.com/rust-lang/rust/pull/38161
4943 [38368]: https://github.com/rust-lang/rust/pull/38368
4944 [38584]: https://github.com/rust-lang/rust/issues/38584
4945 [38661]: https://github.com/rust-lang/rust/pull/38661
4946 [38764]: https://github.com/rust-lang/rust/pull/38764
4947 [38864]: https://github.com/rust-lang/rust/issues/38864
4948 [38897]: https://github.com/rust-lang/rust/pull/38897
4949 [38921]: https://github.com/rust-lang/rust/pull/38921
4950 [38932]: https://github.com/rust-lang/rust/pull/38932
4951 [38945]: https://github.com/rust-lang/rust/pull/38945
4952 [38981]: https://github.com/rust-lang/rust/pull/38981
4953 [39002]: https://github.com/rust-lang/rust/pull/39002
4954 [39116]: https://github.com/rust-lang/rust/pull/39116
4955 [39193]: https://github.com/rust-lang/rust/pull/39193
4956 [39265]: https://github.com/rust-lang/rust/pull/39265
4957 [39356]: https://github.com/rust-lang/rust/pull/39356
4958 [39372]: https://github.com/rust-lang/rust/pull/39372
4959 [39426]: https://github.com/rust-lang/rust/pull/39426
4960 [39431]: https://github.com/rust-lang/rust/pull/39431
4961 [39438]: https://github.com/rust-lang/rust/pull/39438
4962 [39440]: https://github.com/rust-lang/rust/pull/39440
4963 [39485]: https://github.com/rust-lang/rust/pull/39485
4964 [39491]: https://github.com/rust-lang/rust/pull/39491
4965 [39518]: https://github.com/rust-lang/rust/pull/39518
4966 [39538]: https://github.com/rust-lang/rust/pull/39538
4967 [39572]: https://github.com/rust-lang/rust/pull/39572
4968 [39633]: https://github.com/rust-lang/rust/pull/39633
4969 [39642]: https://github.com/rust-lang/rust/pull/39642
4970 [39728]: https://github.com/rust-lang/rust/pull/39728
4971 [39761]: https://github.com/rust-lang/rust/pull/39761
4972 [39788]: https://github.com/rust-lang/rust/pull/39788
4973 [39793]: https://github.com/rust-lang/rust/pull/39793
4974 [39837]: https://github.com/rust-lang/rust/pull/39837
4975 [39843]: https://github.com/rust-lang/rust/pull/39843
4976 [39851]: https://github.com/rust-lang/rust/pull/39851
4977 [39903]: https://github.com/rust-lang/rust/pull/39903
4978 [39939]: https://github.com/rust-lang/rust/pull/39939
4979 [39953]: https://github.com/rust-lang/rust/pull/39953
4980 [39960]: https://github.com/rust-lang/rust/pull/39960
4981 [39990]: https://github.com/rust-lang/rust/pull/39990
4982 [39995]: https://github.com/rust-lang/rust/pull/39995
4983 [40008]: https://github.com/rust-lang/rust/pull/40008
4984 [40009]: https://github.com/rust-lang/rust/pull/40009
4985 [40027]: https://github.com/rust-lang/rust/pull/40027
4986 [40028]: https://github.com/rust-lang/rust/pull/40028
4987 [40037]: https://github.com/rust-lang/rust/pull/40037
4988 [40117]: https://github.com/rust-lang/rust/pull/40117
4989 [40166]: https://github.com/rust-lang/rust/pull/40166
4990 [40245]: https://github.com/rust-lang/rust/pull/40245
4991 [40257]: https://github.com/rust-lang/rust/pull/40257
4992 [40261]: https://github.com/rust-lang/rust/pull/40261
4993 [40265]: https://github.com/rust-lang/rust/pull/40265
4994 [40319]: https://github.com/rust-lang/rust/pull/40319
4995 [40336]: https://github.com/rust-lang/rust/pull/40336
4996 [40526]: https://github.com/rust-lang/rust/pull/40526
4997 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4998 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4999 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5000 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5001 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5002 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5003 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5004 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5005 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5006 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5007 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5008 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5009 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5010 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5011 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5012 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5013 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5014 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5015 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5016 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5017 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5018 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5019 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5020 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5021 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5022 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5023 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5024 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5025 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5026 [mdbook]: https://crates.io/crates/mdbook
5027 [ubook]: https://doc.rust-lang.org/unstable-book/
5030 Version 1.16.0 (2017-03-16)
5031 ===========================
5036 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5037 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5038 match patterns][38069]
5039 * [Clean up semantics of `self` in an import list][38313]
5040 * [`Self` may appear in `impl` headers][38920]
5041 * [`Self` may appear in struct expressions][39282]
5046 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5047 a `.rmeta` file containing only crate metadata][38571]. This can be
5048 used by tools like the Rust Language Service to perform
5049 metadata-only builds.
5050 * [Levenshtein based typo suggestions now work in most places, while
5051 previously they worked only for fields and sometimes for local
5052 variables][38927]. Together with the overhaul of "no
5053 resolution"/"unexpected resolution" errors (#[38154]) they result in
5054 large and systematic improvement in resolution diagnostics.
5055 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5057 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5058 * [`rustc` no longer attempts to provide "consider using an explicit
5059 lifetime" suggestions][37057]. They were inaccurate.
5064 * [`VecDeque::truncate`]
5065 * [`VecDeque::resize`]
5066 * [`String::insert_str`]
5067 * [`Duration::checked_add`]
5068 * [`Duration::checked_sub`]
5069 * [`Duration::checked_div`]
5070 * [`Duration::checked_mul`]
5073 * [`SocketAddr::is_ipv4`]
5074 * [`SocketAddr::is_ipv6`]
5075 * [`IpAddr::is_ipv4`]
5076 * [`IpAddr::is_ipv6`]
5078 * [`Vec::dedup_by_key`]
5079 * [`Result::unwrap_or_default`]
5080 * [`<*const T>::wrapping_offset`]
5081 * [`<*mut T>::wrapping_offset`]
5082 * `CommandExt::creation_flags`
5083 * [`File::set_permissions`]
5084 * [`String::split_off`]
5089 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5090 their argument by `Borrow` parameter][37761]
5091 * [All public types in std implement `Debug`][38006]
5092 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5093 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5094 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5096 * [std: Fix partial writes in `LineWriter`][38062]
5097 * [std: Clamp max read/write sizes on Unix][38062]
5098 * [Use more specific panic message for `&str` slicing errors][38066]
5099 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5100 functionality cannot be achieved in std currently.
5101 * [`writeln!`, like `println!`, now accepts a form with no string
5102 or formatting arguments, to just print a newline][38469]
5103 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5104 * [Reduce the size of static data in `std_unicode::tables`][38781]
5105 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5106 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5108 * [`Duration` implements `Sum`][38712]
5109 * [`String` implements `ToSocketAddrs`][39048]
5114 * [The `cargo check` command does a type check of a project without
5115 building it][cargo/3296]
5116 * [crates.io will display CI badges from Travis and AppVeyor, if
5117 specified in Cargo.toml][cargo/3546]
5118 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5119 * [Compilation profiles accept integer values for `debug`, in addition
5120 to `true` and `false`. These are passed to `rustc` as the value to
5121 `-C debuginfo`][cargo/3534]
5122 * [Implement `cargo --version --verbose`][cargo/3604]
5123 * [All builds now output 'dep-info' build dependencies compatible with
5124 make and ninja][cargo/3557]
5125 * [Build all workspace members with `build --all`][cargo/3511]
5126 * [Document all workspace members with `doc --all`][cargo/3515]
5127 * [Path deps outside workspace are not members][cargo/3443]
5132 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5133 the path to the Rust implementation][38589]
5134 * [The `armv7-linux-androideabi` target no longer enables NEON
5135 extensions, per Google's ABI guide][38413]
5136 * [The stock standard library can be compiled for Redox OS][38401]
5137 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5139 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5141 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5146 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5147 match patterns][38069]
5148 * In this release, references to uninhabited types can not be
5149 pattern-matched. This was accidentally allowed in 1.15.
5150 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5151 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5153 * [Clean up semantics of `self` in an import list][38313]
5154 * Reimplemented lifetime elision. This change was almost entirely compatible
5155 with existing code, but it did close a number of small bugs and loopholes,
5156 as well as being more accepting in some other [cases][41105].
5158 [37057]: https://github.com/rust-lang/rust/pull/37057
5159 [37761]: https://github.com/rust-lang/rust/pull/37761
5160 [38006]: https://github.com/rust-lang/rust/pull/38006
5161 [38051]: https://github.com/rust-lang/rust/pull/38051
5162 [38062]: https://github.com/rust-lang/rust/pull/38062
5163 [38062]: https://github.com/rust-lang/rust/pull/38622
5164 [38066]: https://github.com/rust-lang/rust/pull/38066
5165 [38069]: https://github.com/rust-lang/rust/pull/38069
5166 [38131]: https://github.com/rust-lang/rust/pull/38131
5167 [38154]: https://github.com/rust-lang/rust/pull/38154
5168 [38274]: https://github.com/rust-lang/rust/pull/38274
5169 [38304]: https://github.com/rust-lang/rust/pull/38304
5170 [38313]: https://github.com/rust-lang/rust/pull/38313
5171 [38314]: https://github.com/rust-lang/rust/pull/38314
5172 [38327]: https://github.com/rust-lang/rust/pull/38327
5173 [38401]: https://github.com/rust-lang/rust/pull/38401
5174 [38413]: https://github.com/rust-lang/rust/pull/38413
5175 [38469]: https://github.com/rust-lang/rust/pull/38469
5176 [38559]: https://github.com/rust-lang/rust/pull/38559
5177 [38571]: https://github.com/rust-lang/rust/pull/38571
5178 [38580]: https://github.com/rust-lang/rust/pull/38580
5179 [38589]: https://github.com/rust-lang/rust/pull/38589
5180 [38670]: https://github.com/rust-lang/rust/pull/38670
5181 [38712]: https://github.com/rust-lang/rust/pull/38712
5182 [38726]: https://github.com/rust-lang/rust/pull/38726
5183 [38781]: https://github.com/rust-lang/rust/pull/38781
5184 [38798]: https://github.com/rust-lang/rust/pull/38798
5185 [38909]: https://github.com/rust-lang/rust/pull/38909
5186 [38920]: https://github.com/rust-lang/rust/pull/38920
5187 [38927]: https://github.com/rust-lang/rust/pull/38927
5188 [39048]: https://github.com/rust-lang/rust/pull/39048
5189 [39282]: https://github.com/rust-lang/rust/pull/39282
5190 [39379]: https://github.com/rust-lang/rust/pull/39379
5191 [41105]: https://github.com/rust-lang/rust/issues/41105
5192 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5193 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5194 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5195 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5196 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5197 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5198 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5199 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5200 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5201 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5202 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5203 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5204 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5205 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5206 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5207 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5208 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5209 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5210 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5211 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5212 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5213 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5214 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5215 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5216 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5217 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5218 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5219 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5220 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5221 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5224 Version 1.15.1 (2017-02-09)
5225 ===========================
5227 * [Fix IntoIter::as_mut_slice's signature][39466]
5228 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5230 [39466]: https://github.com/rust-lang/rust/pull/39466
5231 [39523]: https://github.com/rust-lang/rust/pull/39523
5234 Version 1.15.0 (2017-02-02)
5235 ===========================
5240 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5241 stable. This allows popular code-generating crates like Serde and Diesel to
5242 work ergonomically. [RFC 1681].
5243 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5244 with curly braces][36868]. Part of [RFC 1506].
5245 * [A number of minor changes to name resolution have been activated][37127].
5246 They add up to more consistent semantics, allowing for future evolution of
5247 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5248 details of what is different. The breaking changes here have been transitioned
5249 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5250 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5252 * [`?Sized` can be used in `where` clauses][37791]
5253 * [There is now a limit on the size of monomorphized types and it can be
5254 modified with the `#![type_size_limit]` crate attribute, similarly to
5255 the `#![recursion_limit]` attribute][37789]
5260 * [On Windows, the compiler will apply dllimport attributes when linking to
5261 extern functions][37973]. Additional attributes and flags can control which
5262 library kind is linked and its name. [RFC 1717].
5263 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5264 * [The `--test` flag works with procedural macro crates][38107]
5265 * [Fix `extern "aapcs" fn` ABI][37814]
5266 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5267 * [The `format!` expander recognizes incorrect `printf` and shell-style
5268 formatting directives and suggests the correct format][37613].
5269 * [Only report one error for all unused imports in an import list][37456]
5271 Compiler Performance
5272 --------------------
5274 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5275 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5276 * [Don't clone in `UnificationTable::probe`][37848]
5277 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5278 * [Use small vectors in type walker][37760]
5279 * [Macro expansion performance was improved][37701]
5280 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5281 * [Replace FNV with a faster hash function][37229]
5286 * [`std::iter::Iterator::min_by`]
5287 * [`std::iter::Iterator::max_by`]
5288 * [`std::os::*::fs::FileExt`]
5289 * [`std::sync::atomic::Atomic*::get_mut`]
5290 * [`std::sync::atomic::Atomic*::into_inner`]
5291 * [`std::vec::IntoIter::as_slice`]
5292 * [`std::vec::IntoIter::as_mut_slice`]
5293 * [`std::sync::mpsc::Receiver::try_iter`]
5294 * [`std::os::unix::process::CommandExt::before_exec`]
5295 * [`std::rc::Rc::strong_count`]
5296 * [`std::rc::Rc::weak_count`]
5297 * [`std::sync::Arc::strong_count`]
5298 * [`std::sync::Arc::weak_count`]
5299 * [`std::char::encode_utf8`]
5300 * [`std::char::encode_utf16`]
5301 * [`std::cell::Ref::clone`]
5302 * [`std::io::Take::into_inner`]
5307 * [The standard sorting algorithm has been rewritten for dramatic performance
5308 improvements][38192]. It is a hybrid merge sort, drawing influences from
5309 Timsort. Previously it was a naive merge sort.
5310 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5311 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5313 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5314 and `char_indices().last()`][37882]
5315 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5316 * [Chinese characters display correctly in `fmt::Debug`][37855]
5317 * [Derive `Default` for `Duration`][37699]
5318 * [Support creation of anonymous pipes on WinXP/2k][37677]
5319 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5320 * [Don't pass overlapped handles to processes][38835]
5325 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5326 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5327 should instead check the variable at runtime with `std::env`. That the value
5328 was set at build time was a bug, and incorrect when cross-compiling. This
5329 change is known to cause breakage.
5330 * [Add `--all` flag to `cargo test`][cargo/3221]
5331 * [Compile statically against the MSVC CRT][cargo/3363]
5332 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5333 * [Link OpenSSL statically on OSX][cargo/3311]
5334 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5335 * [Test for bad path overrides with summaries][cargo/3336]
5336 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5337 * [Fix retrying crate downloads for network errors][cargo/3348]
5338 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5339 * [Emit more info on --message-format=json][cargo/3319]
5340 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5341 * [Don't ignore errors in workspace manifest][cargo/3409]
5342 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5347 * [Test runners (binaries built with `--test`) now support a `--list` argument
5348 that lists the tests it contains][38185]
5349 * [Test runners now support a `--exact` argument that makes the test filter
5350 match exactly, instead of matching only a substring of the test name][38181]
5351 * [rustdoc supports a `--playground-url` flag][37763]
5352 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5357 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5358 continue to be used in this release by passing `--disable-rustbuild` to the
5359 configure script, but they will be deleted soon. Note that the new build
5360 system uses a different on-disk layout that will likely affect any scripts
5362 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5364 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5365 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5371 * [A number of minor changes to name resolution have been activated][37127].
5372 They add up to more consistent semantics, allowing for future evolution of
5373 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5374 details of what is different. The breaking changes here have been transitioned
5375 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5376 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5377 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5378 should instead check the variable at runtime with `std::env`. That the value
5379 was set at build time was a bug, and incorrect when cross-compiling. This
5380 change is known to cause breakage.
5381 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5382 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5383 1.10 and is now an error by default. It will become a hard error in the near
5385 * [The semantics relating modules to file system directories are changing in
5386 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5387 lint, which is a warning in this release, and will become a hard error in the
5389 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5390 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5391 the underlying iterator][37834]
5393 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5394 [33685]: https://github.com/rust-lang/rust/issues/33685
5395 [36868]: https://github.com/rust-lang/rust/pull/36868
5396 [37127]: https://github.com/rust-lang/rust/pull/37127
5397 [37229]: https://github.com/rust-lang/rust/pull/37229
5398 [37456]: https://github.com/rust-lang/rust/pull/37456
5399 [37527]: https://github.com/rust-lang/rust/pull/37527
5400 [37602]: https://github.com/rust-lang/rust/pull/37602
5401 [37613]: https://github.com/rust-lang/rust/pull/37613
5402 [37615]: https://github.com/rust-lang/rust/pull/37615
5403 [37636]: https://github.com/rust-lang/rust/pull/37636
5404 [37627]: https://github.com/rust-lang/rust/pull/37627
5405 [37642]: https://github.com/rust-lang/rust/pull/37642
5406 [37677]: https://github.com/rust-lang/rust/pull/37677
5407 [37699]: https://github.com/rust-lang/rust/pull/37699
5408 [37701]: https://github.com/rust-lang/rust/pull/37701
5409 [37705]: https://github.com/rust-lang/rust/pull/37705
5410 [37749]: https://github.com/rust-lang/rust/pull/37749
5411 [37760]: https://github.com/rust-lang/rust/pull/37760
5412 [37763]: https://github.com/rust-lang/rust/pull/37763
5413 [37764]: https://github.com/rust-lang/rust/pull/37764
5414 [37789]: https://github.com/rust-lang/rust/pull/37789
5415 [37791]: https://github.com/rust-lang/rust/pull/37791
5416 [37814]: https://github.com/rust-lang/rust/pull/37814
5417 [37817]: https://github.com/rust-lang/rust/pull/37817
5418 [37834]: https://github.com/rust-lang/rust/pull/37834
5419 [37848]: https://github.com/rust-lang/rust/pull/37848
5420 [37855]: https://github.com/rust-lang/rust/pull/37855
5421 [37882]: https://github.com/rust-lang/rust/pull/37882
5422 [37888]: https://github.com/rust-lang/rust/pull/37888
5423 [37973]: https://github.com/rust-lang/rust/pull/37973
5424 [37979]: https://github.com/rust-lang/rust/pull/37979
5425 [38086]: https://github.com/rust-lang/rust/pull/38086
5426 [38107]: https://github.com/rust-lang/rust/pull/38107
5427 [38117]: https://github.com/rust-lang/rust/pull/38117
5428 [38134]: https://github.com/rust-lang/rust/pull/38134
5429 [38146]: https://github.com/rust-lang/rust/pull/38146
5430 [38181]: https://github.com/rust-lang/rust/pull/38181
5431 [38182]: https://github.com/rust-lang/rust/pull/38182
5432 [38185]: https://github.com/rust-lang/rust/pull/38185
5433 [38192]: https://github.com/rust-lang/rust/pull/38192
5434 [38279]: https://github.com/rust-lang/rust/pull/38279
5435 [38835]: https://github.com/rust-lang/rust/pull/38835
5436 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5437 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5438 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5439 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5440 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5441 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5442 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5443 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5444 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5445 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5446 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5447 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5448 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5449 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5450 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5451 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5452 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5453 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5454 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5455 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5456 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5457 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5458 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5459 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5460 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5461 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5462 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5463 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5464 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5465 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5466 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5467 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5468 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5469 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5470 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5471 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5472 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5473 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5476 Version 1.14.0 (2016-12-22)
5477 ===========================
5482 * [`..` matches multiple tuple fields in enum variants, structs
5483 and tuples][36843]. [RFC 1492].
5484 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5485 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5486 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5487 dereferencing][36822]
5492 * [Mark enums with non-zero discriminant as non-zero][37224]
5493 * [Lower-case `static mut` names are linted like other
5494 statics and consts][37162]
5495 * [Fix ICE on some macros in const integer positions
5496 (e.g. `[u8; m!()]`)][36819]
5497 * [Improve error message and snippet for "did you mean `x`"][36798]
5498 * [Add a panic-strategy field to the target specification][36794]
5499 * [Include LLVM version in `--version --verbose`][37200]
5501 Compile-time Optimizations
5502 --------------------------
5504 * [Improve macro expansion performance][37569]
5505 * [Shrink `Expr_::ExprInlineAsm`][37445]
5506 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5507 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5508 * [Avoid more allocations when compiling html5ever][37373]
5509 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5510 * [Avoid some allocations in the macro parser][37318]
5511 * [Use a faster deflate setting][37298]
5512 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5513 during interning of slices][37270]
5514 * [Optimize `write_metadata`][37267]
5515 * [Don't process obligation forest cycles when stalled][37231]
5516 * [Avoid many `CrateConfig` clones][37161]
5517 * [Optimize `Substs::super_fold_with`][37108]
5518 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5519 * [Speed up `plug_leaks`][36917]
5524 * [`println!()`, with no arguments, prints newline][36825].
5525 Previously, an empty string was required to achieve the same.
5526 * [`Wrapping` impls standard binary and unary operators, as well as
5527 the `Sum` and `Product` iterators][37356]
5528 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5530 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5531 `VecDeque` iterators][37315]
5532 * [Improve `SipHasher` performance on small values][37312]
5533 * [Add Iterator trait TrustedLen to enable better FromIterator /
5535 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5536 * [`ReadDir` implements `Debug`][37221]
5537 * [Implement `RefUnwindSafe` for atomic types][37178]
5538 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5539 * [Avoid allocations in `Decoder::read_str`][37064]
5540 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5541 * [Impl `Debug` for raw pointers to unsized data][36880]
5542 * [Don't reuse `HashMap` random seeds][37470]
5543 * [The internal memory layout of `HashMap` is more cache-friendly, for
5544 significant improvements in some operations][36692]
5545 * [`HashMap` uses less memory on 32-bit architectures][36595]
5546 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5551 * [Expose rustc cfg values to build scripts][cargo/3243]
5552 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5553 * [Fix passing --features when testing multiple packages][cargo/3280]
5554 * [Use a single profile set per workspace][cargo/3249]
5555 * [Load `replace` sections from lock files][cargo/3220]
5556 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5561 * [rustup is the recommended Rust installation method][1.14rustup]
5562 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5563 S390x. These are [tier 2] platforms and may have major defects. Follow the
5564 instructions on the website to install, or add the targets to an existing
5565 installation with `rustup target add`. The new target triples are:
5566 - `mips-unknown-linux-gnu`
5567 - `mipsel-unknown-linux-gnu`
5568 - `mips64-unknown-linux-gnuabi64`
5569 - `mips64el-unknown-linux-gnuabi64 `
5570 - `powerpc-unknown-linux-gnu`
5571 - `powerpc64-unknown-linux-gnu`
5572 - `powerpc64le-unknown-linux-gnu`
5573 - `s390x-unknown-linux-gnu `
5574 * This release includes target (std) builds for ARM Linux running MUSL
5575 libc. These are [tier 2] platforms and may have major defects. Add the
5576 following triples to an existing rustup installation with `rustup target add`:
5577 - `arm-unknown-linux-musleabi`
5578 - `arm-unknown-linux-musleabihf`
5579 - `armv7-unknown-linux-musleabihf`
5580 * This release includes [experimental support for WebAssembly][1.14wasm], via
5581 the `wasm32-unknown-emscripten` target. This target is known to have major
5582 defects. Please test, report, and fix.
5583 * rustup no longer installs documentation by default. Run `rustup
5584 component add rust-docs` to install.
5585 * [Fix line stepping in debugger][37310]
5586 * [Enable line number debuginfo in releases][37280]
5591 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5592 * [Add support for Fuchsia OS][37313]
5593 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5598 * [A number of forward-compatibility lints used by the compiler
5599 to gradually introduce language changes have been converted
5600 to deny by default][36894]:
5601 - ["use of inaccessible extern crate erroneously allowed"][36886]
5602 - ["type parameter default erroneously allowed in invalid location"][36887]
5603 - ["detects super or self keywords at the beginning of global path"][36888]
5604 - ["two overlapping inherent impls define an item with the same name
5605 were erroneously allowed"][36889]
5606 - ["floating-point constants cannot be used in patterns"][36890]
5607 - ["constants of struct or enum type can only be used in a pattern if
5608 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5609 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5610 * [Prohibit patterns in trait methods without bodies][37378]
5611 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5612 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5613 * [The `$crate` macro variable is accepted in fewer locations][37213]
5614 * [Impls specifying extra region requirements beyond the trait
5615 they implement are rejected][37167]
5616 * [Enums may not be unsized][37111]. Unsized enums are intended to
5617 work but never have. For now they are forbidden.
5618 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5620 [tier 2]: https://forge.rust-lang.org/platform-support.html
5621 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5622 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5623 [36430]: https://github.com/rust-lang/rust/pull/36430
5624 [36595]: https://github.com/rust-lang/rust/pull/36595
5625 [36595]: https://github.com/rust-lang/rust/pull/36595
5626 [36692]: https://github.com/rust-lang/rust/pull/36692
5627 [36767]: https://github.com/rust-lang/rust/pull/36767
5628 [36794]: https://github.com/rust-lang/rust/pull/36794
5629 [36798]: https://github.com/rust-lang/rust/pull/36798
5630 [36819]: https://github.com/rust-lang/rust/pull/36819
5631 [36822]: https://github.com/rust-lang/rust/pull/36822
5632 [36825]: https://github.com/rust-lang/rust/pull/36825
5633 [36843]: https://github.com/rust-lang/rust/pull/36843
5634 [36880]: https://github.com/rust-lang/rust/pull/36880
5635 [36886]: https://github.com/rust-lang/rust/issues/36886
5636 [36887]: https://github.com/rust-lang/rust/issues/36887
5637 [36888]: https://github.com/rust-lang/rust/issues/36888
5638 [36889]: https://github.com/rust-lang/rust/issues/36889
5639 [36890]: https://github.com/rust-lang/rust/issues/36890
5640 [36891]: https://github.com/rust-lang/rust/issues/36891
5641 [36892]: https://github.com/rust-lang/rust/issues/36892
5642 [36894]: https://github.com/rust-lang/rust/pull/36894
5643 [36917]: https://github.com/rust-lang/rust/pull/36917
5644 [36993]: https://github.com/rust-lang/rust/pull/36993
5645 [37037]: https://github.com/rust-lang/rust/pull/37037
5646 [37064]: https://github.com/rust-lang/rust/pull/37064
5647 [37094]: https://github.com/rust-lang/rust/pull/37094
5648 [37108]: https://github.com/rust-lang/rust/pull/37108
5649 [37111]: https://github.com/rust-lang/rust/pull/37111
5650 [37161]: https://github.com/rust-lang/rust/pull/37161
5651 [37162]: https://github.com/rust-lang/rust/pull/37162
5652 [37167]: https://github.com/rust-lang/rust/pull/37167
5653 [37178]: https://github.com/rust-lang/rust/pull/37178
5654 [37200]: https://github.com/rust-lang/rust/pull/37200
5655 [37213]: https://github.com/rust-lang/rust/pull/37213
5656 [37221]: https://github.com/rust-lang/rust/pull/37221
5657 [37224]: https://github.com/rust-lang/rust/pull/37224
5658 [37230]: https://github.com/rust-lang/rust/pull/37230
5659 [37231]: https://github.com/rust-lang/rust/pull/37231
5660 [37247]: https://github.com/rust-lang/rust/pull/37247
5661 [37267]: https://github.com/rust-lang/rust/pull/37267
5662 [37270]: https://github.com/rust-lang/rust/pull/37270
5663 [37273]: https://github.com/rust-lang/rust/pull/37273
5664 [37280]: https://github.com/rust-lang/rust/pull/37280
5665 [37298]: https://github.com/rust-lang/rust/pull/37298
5666 [37306]: https://github.com/rust-lang/rust/pull/37306
5667 [37310]: https://github.com/rust-lang/rust/pull/37310
5668 [37312]: https://github.com/rust-lang/rust/pull/37312
5669 [37313]: https://github.com/rust-lang/rust/pull/37313
5670 [37315]: https://github.com/rust-lang/rust/pull/37315
5671 [37318]: https://github.com/rust-lang/rust/pull/37318
5672 [37322]: https://github.com/rust-lang/rust/pull/37322
5673 [37326]: https://github.com/rust-lang/rust/pull/37326
5674 [37351]: https://github.com/rust-lang/rust/pull/37351
5675 [37356]: https://github.com/rust-lang/rust/pull/37356
5676 [37367]: https://github.com/rust-lang/rust/pull/37367
5677 [37373]: https://github.com/rust-lang/rust/pull/37373
5678 [37378]: https://github.com/rust-lang/rust/pull/37378
5679 [37389]: https://github.com/rust-lang/rust/pull/37389
5680 [37392]: https://github.com/rust-lang/rust/pull/37392
5681 [37427]: https://github.com/rust-lang/rust/pull/37427
5682 [37439]: https://github.com/rust-lang/rust/pull/37439
5683 [37445]: https://github.com/rust-lang/rust/pull/37445
5684 [37470]: https://github.com/rust-lang/rust/pull/37470
5685 [37569]: https://github.com/rust-lang/rust/pull/37569
5686 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5687 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5688 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5689 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5690 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5691 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5692 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5695 Version 1.13.0 (2016-11-10)
5696 ===========================
5701 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5702 errors, like the `try!` macro, described in [RFC 0243].
5703 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5704 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5705 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5706 * [Fix lifetime rules for 'if' conditions][36029]
5707 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5712 * [Add the `-C link-arg` argument][36574]
5713 * [Remove the old AST-based backend from rustc_trans][35764]
5714 * [Don't enable NEON by default on armv7 Linux][35814]
5715 * [Fix debug line number info for macro expansions][35238]
5716 * [Do not emit "class method" debuginfo for types that are not
5717 DICompositeType][36008]
5718 * [Warn about multiple conflicting #[repr] hints][34623]
5719 * [When sizing DST, don't double-count nested struct prefixes][36351]
5720 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5721 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5722 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5723 * [Expand macros without recursing to avoid stack overflows][36214]
5728 * [Replace macro backtraces with labeled local uses][35702]
5729 * [Improve error message for misplaced doc comments][33922]
5730 * [Buffer unix and lock windows to prevent message interleaving][35975]
5731 * [Update lifetime errors to specifically note temporaries][36171]
5732 * [Special case a few colors for Windows][36178]
5733 * [Suggest `use self` when such an import resolves][36289]
5734 * [Be more specific when type parameter shadows primitive type][36338]
5735 * Many minor improvements
5737 Compile-time Optimizations
5738 --------------------------
5740 * [Compute and cache HIR hashes at beginning][35854]
5741 * [Don't hash types in loan paths][36004]
5742 * [Cache projections in trans][35761]
5743 * [Optimize the parser's last token handling][36527]
5744 * [Only instantiate #[inline] functions in codegen units referencing
5745 them][36524]. This leads to big improvements in cases where crates export
5746 define many inline functions without using them directly.
5747 * [Lazily allocate TypedArena's first chunk][36592]
5748 * [Don't allocate during default HashSet creation][36734]
5755 * [`overflowing_abs`]
5756 * [`RefCell::try_borrow`]
5757 * [`RefCell::try_borrow_mut`]
5762 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5763 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5765 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5766 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5767 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5768 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5769 * [Use arc4rand on FreeBSD][35884]
5770 * [memrchr: Correct aligned offset computation][35969]
5771 * [Improve Demangling of Rust Symbols][36059]
5772 * [Use monotonic time in condition variables][35048]
5773 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5774 * [Implement conversion traits for `char`][35755]
5775 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5776 * [Zero first byte of CString on drop][36264]
5777 * [Inherit overflow checks for sum and product][36372]
5778 * [Add missing Eq implementations][36423]
5779 * [Implement `Debug` for `DirEntry`][36631]
5780 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5782 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5783 * [Implement more traits for `std::io::ErrorKind`][35911]
5784 * [Optimize BinaryHeap bounds checking][36072]
5785 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5786 `extend_with_element`][36355]
5787 * [Fix overflow checking in unsigned pow()][34942]
5792 * This release includes security fixes to both curl and OpenSSL.
5793 * [Fix transitive doctests when panic=abort][cargo/3021]
5794 * [Add --all-features flag to cargo][cargo/3038]
5795 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5796 * [Don't parse the home directory more than once][cargo/3078]
5797 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5798 * [Update OpenSSL to 1.0.2j][cargo/3121]
5799 * [Add license and license_file to cargo metadata output][cargo/3110]
5800 * [Make crates-io registry URL optional in config; ignore all changes to
5801 source.crates-io][cargo/3089]
5802 * [Don't download dependencies from other platforms][cargo/3123]
5803 * [Build transitive dev-dependencies when needed][cargo/3125]
5804 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5805 * [Avoid updating registry when adding existing deps][cargo/3144]
5806 * [Warn about path overrides that won't work][cargo/3136]
5807 * [Use workspaces during `cargo install`][cargo/3146]
5808 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5809 * [Add --message-format flag][cargo/3000]
5810 * [Pass target environment for rustdoc][cargo/3205]
5811 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5812 * [Update curl and curl-sys][cargo/3241]
5813 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5818 * [rustdoc: Add the `--sysroot` argument][36586]
5819 * [rustdoc: Fix a couple of issues with the search results][35655]
5820 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5821 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5822 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5827 * [Remove unmaintained style guide][35124]
5828 * [Add s390x support][36369]
5829 * [Initial work at Haiku OS support][36727]
5830 * [Add mips-uclibc targets][35734]
5831 * [Crate-ify compiler-rt into compiler-builtins][35021]
5832 * [Add rustc version info (git hash + date) to dist tarball][36213]
5833 * Many documentation improvements
5838 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5839 * [Deny (by default) transmuting from fn item types to pointer-sized
5840 types][34923]. Continuing the long transition to zero-sized fn items,
5842 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5844 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5845 * [Fix lifetime rules for 'if' conditions][36029].
5846 * [Inherit overflow checks for sum and product][36372].
5847 * [Forbid user-defined macros named "macro_rules"][36730].
5849 [33922]: https://github.com/rust-lang/rust/pull/33922
5850 [34623]: https://github.com/rust-lang/rust/pull/34623
5851 [34923]: https://github.com/rust-lang/rust/pull/34923
5852 [34942]: https://github.com/rust-lang/rust/pull/34942
5853 [34982]: https://github.com/rust-lang/rust/pull/34982
5854 [35021]: https://github.com/rust-lang/rust/pull/35021
5855 [35048]: https://github.com/rust-lang/rust/pull/35048
5856 [35074]: https://github.com/rust-lang/rust/pull/35074
5857 [35124]: https://github.com/rust-lang/rust/pull/35124
5858 [35234]: https://github.com/rust-lang/rust/pull/35234
5859 [35238]: https://github.com/rust-lang/rust/pull/35238
5860 [35354]: https://github.com/rust-lang/rust/pull/35354
5861 [35559]: https://github.com/rust-lang/rust/pull/35559
5862 [35585]: https://github.com/rust-lang/rust/pull/35585
5863 [35627]: https://github.com/rust-lang/rust/pull/35627
5864 [35655]: https://github.com/rust-lang/rust/pull/35655
5865 [35702]: https://github.com/rust-lang/rust/pull/35702
5866 [35707]: https://github.com/rust-lang/rust/pull/35707
5867 [35728]: https://github.com/rust-lang/rust/pull/35728
5868 [35734]: https://github.com/rust-lang/rust/pull/35734
5869 [35755]: https://github.com/rust-lang/rust/pull/35755
5870 [35761]: https://github.com/rust-lang/rust/pull/35761
5871 [35764]: https://github.com/rust-lang/rust/pull/35764
5872 [35814]: https://github.com/rust-lang/rust/pull/35814
5873 [35854]: https://github.com/rust-lang/rust/pull/35854
5874 [35871]: https://github.com/rust-lang/rust/pull/35871
5875 [35884]: https://github.com/rust-lang/rust/pull/35884
5876 [35911]: https://github.com/rust-lang/rust/pull/35911
5877 [35969]: https://github.com/rust-lang/rust/pull/35969
5878 [35975]: https://github.com/rust-lang/rust/pull/35975
5879 [36004]: https://github.com/rust-lang/rust/pull/36004
5880 [36008]: https://github.com/rust-lang/rust/pull/36008
5881 [36014]: https://github.com/rust-lang/rust/pull/36014
5882 [36029]: https://github.com/rust-lang/rust/pull/36029
5883 [36059]: https://github.com/rust-lang/rust/pull/36059
5884 [36072]: https://github.com/rust-lang/rust/pull/36072
5885 [36101]: https://github.com/rust-lang/rust/pull/36101
5886 [36104]: https://github.com/rust-lang/rust/pull/36104
5887 [36171]: https://github.com/rust-lang/rust/pull/36171
5888 [36173]: https://github.com/rust-lang/rust/pull/36173
5889 [36178]: https://github.com/rust-lang/rust/pull/36178
5890 [36213]: https://github.com/rust-lang/rust/pull/36213
5891 [36214]: https://github.com/rust-lang/rust/pull/36214
5892 [36264]: https://github.com/rust-lang/rust/pull/36264
5893 [36266]: https://github.com/rust-lang/rust/pull/36266
5894 [36289]: https://github.com/rust-lang/rust/pull/36289
5895 [36338]: https://github.com/rust-lang/rust/pull/36338
5896 [36351]: https://github.com/rust-lang/rust/pull/36351
5897 [36355]: https://github.com/rust-lang/rust/pull/36355
5898 [36369]: https://github.com/rust-lang/rust/pull/36369
5899 [36372]: https://github.com/rust-lang/rust/pull/36372
5900 [36423]: https://github.com/rust-lang/rust/pull/36423
5901 [36482]: https://github.com/rust-lang/rust/pull/36482
5902 [36505]: https://github.com/rust-lang/rust/pull/36505
5903 [36524]: https://github.com/rust-lang/rust/pull/36524
5904 [36527]: https://github.com/rust-lang/rust/pull/36527
5905 [36551]: https://github.com/rust-lang/rust/pull/36551
5906 [36574]: https://github.com/rust-lang/rust/pull/36574
5907 [36586]: https://github.com/rust-lang/rust/pull/36586
5908 [36592]: https://github.com/rust-lang/rust/pull/36592
5909 [36631]: https://github.com/rust-lang/rust/pull/36631
5910 [36639]: https://github.com/rust-lang/rust/pull/36639
5911 [36721]: https://github.com/rust-lang/rust/pull/36721
5912 [36727]: https://github.com/rust-lang/rust/pull/36727
5913 [36730]: https://github.com/rust-lang/rust/pull/36730
5914 [36734]: https://github.com/rust-lang/rust/pull/36734
5915 [36754]: https://github.com/rust-lang/rust/pull/36754
5916 [36995]: https://github.com/rust-lang/rust/pull/36995
5917 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5918 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5919 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5920 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5921 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5922 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5923 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5924 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5925 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5926 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5927 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5928 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5929 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5930 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5931 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5932 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5933 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5934 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5935 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5936 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5937 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5938 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5939 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5940 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5941 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5942 [rustup]: https://www.rustup.rs
5943 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5944 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5945 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5946 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5947 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5948 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5949 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5952 Version 1.12.1 (2016-10-20)
5953 ===========================
5958 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5959 * [Confusion with double negation and booleans][36856]
5960 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5961 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5962 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5963 * [Corrupted memory after updated to 1.12][36936]
5964 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5965 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5966 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5968 [36381]: https://github.com/rust-lang/rust/issues/36381
5969 [36856]: https://github.com/rust-lang/rust/issues/36856
5970 [36875]: https://github.com/rust-lang/rust/issues/36875
5971 [36924]: https://github.com/rust-lang/rust/issues/36924
5972 [36926]: https://github.com/rust-lang/rust/issues/36926
5973 [36936]: https://github.com/rust-lang/rust/issues/36936
5974 [37026]: https://github.com/rust-lang/rust/issues/37026
5975 [37112]: https://github.com/rust-lang/rust/issues/37112
5976 [37153]: https://github.com/rust-lang/rust/issues/37153
5979 Version 1.12.0 (2016-09-29)
5980 ===========================
5985 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5986 This translation pass is far simpler than the previous AST->LLVM pass, and
5987 creates opportunities to perform new optimizations directly on the MIR. It
5988 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5989 * [`rustc` presents a new, more readable error format, along with
5990 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5991 Most common editors supporting Rust have been updated to work with it. It was
5992 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5997 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5998 This translation pass is far simpler than the previous AST->LLVM pass, and
5999 creates opportunities to perform new optimizations directly on the MIR. It
6000 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6001 * [Print the Rust target name, not the LLVM target name, with
6002 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6003 * [The computation of `TypeId` is correct in some cases where it was previously
6004 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6005 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6006 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6007 `--print relocation-models`, and `--print code-models` print the available
6008 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6009 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6010 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6011 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6012 These targets produce statically-linked binaries. There are no binary release
6018 * [`rustc` presents a new, more readable error format, along with
6019 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6020 Most common editors supporting Rust have been updated to work with it. It was
6021 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6022 * [In error descriptions, references are now described in plain English,
6023 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6024 * [In error type descriptions, unknown numeric types are named `{integer}` or
6025 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6026 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6031 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6032 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6033 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6034 useful](https://github.com/rust-lang/rust/pull/34908)
6035 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6036 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6037 * [Semicolons are properly required as statement delimiters inside
6038 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6039 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6044 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6045 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6046 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6047 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6048 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6049 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6050 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6051 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6052 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6053 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6054 Both on Unix and Windows.
6055 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6056 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6057 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6058 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6059 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6060 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6061 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6062 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6067 * [The `format!` macro and friends now allow a single argument to be formatted
6068 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6069 * [The lifetime bounds on `[T]::binary_search_by` and
6070 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6071 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6072 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6073 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6074 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6075 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6076 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6077 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6078 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6079 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6080 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6081 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6082 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6083 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6084 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6085 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6086 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6087 * [`mpsc::sync_channel` `Receiver`s return any available message before
6088 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6089 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6090 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6095 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6096 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6097 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6098 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6099 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6100 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6101 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6102 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6103 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6104 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6105 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6106 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6107 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6108 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6109 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6110 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6115 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6116 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6121 * [Test binaries now support a `--test-threads` argument to specify the number
6122 of threads used to run tests, and which acts the same as the
6123 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6124 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6125 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6126 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6127 * [Rust releases now come with source packages that can be installed by rustup
6128 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6129 The resulting source code can be used by tools and IDES, located in the
6130 sysroot under `lib/rustlib/src`.
6135 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6136 * Many minor improvements to the documentation.
6137 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6142 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6143 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6144 * [When formatting strings, if "precision" is specified, the "fill",
6145 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6146 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6149 Version 1.11.0 (2016-08-18)
6150 ===========================
6155 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6156 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6157 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6158 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6163 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6164 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6165 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6166 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6167 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6168 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6169 (in libcore - previously stabilized in libstd)
6170 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6171 (in libcore - previously stabilized in libstd)
6172 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6173 (in libcore - previously stabilized in libstd)
6174 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6175 (in libcore - previously stabilized in libstd)
6176 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6177 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6178 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6179 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6184 * [The `thread_local!` macro supports multiple definitions in a single
6185 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6186 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6187 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6188 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6189 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6190 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6191 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6192 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6197 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6198 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6199 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6200 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6201 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6202 and `-vv` prints warnings for all crates.
6203 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6204 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6205 This provides room for expansion by arbitrary tools.
6206 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6207 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6208 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6209 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6210 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6211 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6212 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6217 * [Caching projections speeds up type check dramatically for some
6218 workloads](https://github.com/rust-lang/rust/pull/33816)
6219 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6220 This hasher is faster, but is believed to provide sufficient
6221 protection from collision attacks.
6222 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6227 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6228 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6229 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6230 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6231 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6236 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6237 * [When emitting debug info, rustc emits frame pointers for closures,
6238 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6239 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6240 * Many more errors have been given error codes and extended
6242 * API documentation continues to be improved, with many new examples
6247 * [rustc no longer hangs when dependencies recursively re-export
6248 submodules](https://github.com/rust-lang/rust/pull/34542)
6249 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6250 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6251 rewritten](https://github.com/rust-lang/rust/pull/33895)
6252 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6253 No targets use this yet, but it works toward AVR support.
6258 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6259 * [The new follow-set rules that place restrictions on `macro_rules!`
6260 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6261 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6262 and has been a warning since 1.10.
6263 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6264 This causes breakage in some corner cases.
6267 Version 1.10.0 (2016-07-07)
6268 ===========================
6273 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6274 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6275 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6276 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6277 * [`panic!` can be converted to a runtime abort with the
6278 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6279 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6280 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6281 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6282 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6283 Note that Cargo does not yet directly support cdylibs.
6288 * `os::windows::fs::OpenOptionsExt::access_mode`
6289 * `os::windows::fs::OpenOptionsExt::share_mode`
6290 * `os::windows::fs::OpenOptionsExt::custom_flags`
6291 * `os::windows::fs::OpenOptionsExt::attributes`
6292 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6293 * `os::unix::fs::OpenOptionsExt::custom_flags`
6294 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6295 * `Default for sync::Weak`
6296 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6297 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6298 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6299 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6300 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6301 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6302 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6303 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6304 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6305 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6306 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6307 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6308 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6309 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6310 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6311 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6312 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6313 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6314 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6315 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6316 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6317 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6318 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6319 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6320 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6321 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6322 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6323 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6324 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6325 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6326 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6327 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6328 * Read/Write/RawFd impls for `UnixStream`
6329 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6330 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6331 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6332 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6333 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6334 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6335 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6336 * RawFd impls for `UnixListener`
6337 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6338 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6339 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6340 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6341 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6342 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6343 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6344 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6345 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6346 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6347 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6348 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6349 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6350 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6351 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6352 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6353 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6354 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6355 * RawFd impls for `UnixDatagram`
6356 * `{BTree,Hash}Map::values_mut`
6357 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6362 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6363 The semantics of this minor method are subtle and probably not what
6365 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6366 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6367 will fall back to `/dev/urandom` temporarily to avoid blocking
6368 during early boot](https://github.com/rust-lang/rust/pull/33086).
6369 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6370 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6371 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6372 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6373 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6374 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6375 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6379 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6380 This controls the runtime behavior of the `panic!` macro
6381 and can be either "unwind" (the default), or "abort".
6382 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6383 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6384 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6385 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6386 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6387 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6388 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6389 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6390 By default they are retried twice, which can be customized with the
6391 `net.retry` value in `.cargo/config`.
6392 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6393 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6394 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6395 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6396 Makes it possible to install multiple crates in parallel.
6397 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6398 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6399 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6400 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6401 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6402 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6407 * [rustc memory usage was reduced by refactoring the context used for
6408 type checking](https://github.com/rust-lang/rust/pull/33425).
6409 * [Speed up creation of `HashMap`s by caching the random keys used
6410 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6411 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6412 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6413 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6414 10x faster than the previous lookup tables.
6415 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6420 * Many incremental improvements to documentation and rustdoc.
6421 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6422 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6423 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6424 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6425 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6426 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6427 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6432 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6433 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6434 * [`std` no longer prints backtraces on platforms where the running
6435 module must be loaded with `env::current_exe`, which can't be relied
6436 on](https://github.com/rust-lang/rust/pull/33554).
6437 * This release includes std binaries for the i586-unknown-linux-gnu,
6438 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6439 i586 target is for old x86 hardware without SSE2, and the armv7
6440 target is for Android running on modern ARM architectures.
6441 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6442 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6443 * [On Unix the runtime aborts by calling `libc::abort` instead of
6444 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6445 * [Rust is now bootstrapped from the previous release of Rust,
6446 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6451 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6452 * [`target_env` for Linux ARM targets is just `gnu`, not
6453 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6454 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6455 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6456 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6457 Affects how macros are parsed.
6458 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6459 * [Feature-gated attributes on macro-generated macro invocations are
6460 now rejected](https://github.com/rust-lang/rust/pull/32791).
6461 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6462 This caused some minor changes to type inference.
6465 Version 1.9.0 (2016-05-26)
6466 ==========================
6471 * The `#[deprecated]` attribute when applied to an API will generate
6472 warnings when used. The warnings may be suppressed with
6473 `#[allow(deprecated)]`. [RFC 1270].
6474 * [`fn` item types are zero sized, and each `fn` names a unique
6475 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6476 `transmute` on a `fn` type will generate a warning for a few cycles,
6477 then will be converted to an error.
6478 * [Field and method resolution understand visibility, so private
6479 fields and methods cannot prevent the proper use of public fields
6480 and methods][1.9fv].
6481 * [The parser considers unicode codepoints in the
6482 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6488 * [`std::panic::catch_unwind`] (renamed from `recover`)
6489 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6490 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6491 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6492 * [`str::is_char_boundary`]
6493 * [`<*const T>::as_ref`]
6494 * [`<*mut T>::as_ref`]
6495 * [`<*mut T>::as_mut`]
6496 * [`AsciiExt::make_ascii_uppercase`]
6497 * [`AsciiExt::make_ascii_lowercase`]
6498 * [`char::decode_utf16`]
6499 * [`char::DecodeUtf16`]
6500 * [`char::DecodeUtf16Error`]
6501 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6502 * [`BTreeSet::take`]
6503 * [`BTreeSet::replace`]
6506 * [`HashSet::replace`]
6508 * [`OsString::with_capacity`]
6509 * [`OsString::clear`]
6510 * [`OsString::capacity`]
6511 * [`OsString::reserve`]
6512 * [`OsString::reserve_exact`]
6513 * [`OsStr::is_empty`]
6515 * [`std::os::unix::thread`]
6518 * [`JoinHandleExt::as_pthread_t`]
6519 * [`JoinHandleExt::into_pthread_t`]
6520 * [`HashSet::hasher`]
6521 * [`HashMap::hasher`]
6522 * [`CommandExt::exec`]
6523 * [`File::try_clone`]
6524 * [`SocketAddr::set_ip`]
6525 * [`SocketAddr::set_port`]
6526 * [`SocketAddrV4::set_ip`]
6527 * [`SocketAddrV4::set_port`]
6528 * [`SocketAddrV6::set_ip`]
6529 * [`SocketAddrV6::set_port`]
6530 * [`SocketAddrV6::set_flowinfo`]
6531 * [`SocketAddrV6::set_scope_id`]
6532 * [`slice::copy_from_slice`]
6533 * [`ptr::read_volatile`]
6534 * [`ptr::write_volatile`]
6535 * [`OpenOptions::create_new`]
6536 * [`TcpStream::set_nodelay`]
6537 * [`TcpStream::nodelay`]
6538 * [`TcpStream::set_ttl`]
6539 * [`TcpStream::ttl`]
6540 * [`TcpStream::set_only_v6`]
6541 * [`TcpStream::only_v6`]
6542 * [`TcpStream::take_error`]
6543 * [`TcpStream::set_nonblocking`]
6544 * [`TcpListener::set_ttl`]
6545 * [`TcpListener::ttl`]
6546 * [`TcpListener::set_only_v6`]
6547 * [`TcpListener::only_v6`]
6548 * [`TcpListener::take_error`]
6549 * [`TcpListener::set_nonblocking`]
6550 * [`UdpSocket::set_broadcast`]
6551 * [`UdpSocket::broadcast`]
6552 * [`UdpSocket::set_multicast_loop_v4`]
6553 * [`UdpSocket::multicast_loop_v4`]
6554 * [`UdpSocket::set_multicast_ttl_v4`]
6555 * [`UdpSocket::multicast_ttl_v4`]
6556 * [`UdpSocket::set_multicast_loop_v6`]
6557 * [`UdpSocket::multicast_loop_v6`]
6558 * [`UdpSocket::set_multicast_ttl_v6`]
6559 * [`UdpSocket::multicast_ttl_v6`]
6560 * [`UdpSocket::set_ttl`]
6561 * [`UdpSocket::ttl`]
6562 * [`UdpSocket::set_only_v6`]
6563 * [`UdpSocket::only_v6`]
6564 * [`UdpSocket::join_multicast_v4`]
6565 * [`UdpSocket::join_multicast_v6`]
6566 * [`UdpSocket::leave_multicast_v4`]
6567 * [`UdpSocket::leave_multicast_v6`]
6568 * [`UdpSocket::take_error`]
6569 * [`UdpSocket::connect`]
6570 * [`UdpSocket::send`]
6571 * [`UdpSocket::recv`]
6572 * [`UdpSocket::set_nonblocking`]
6577 * [`std::sync::Once` is poisoned if its initialization function
6579 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6580 * [Most types implement `fmt::Debug`][1.9db].
6581 * [The default buffer size used by `BufReader` and `BufWriter` was
6582 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6583 used by other languages.
6584 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6585 `Duration` additionally implements `*=` and `/=`][1.9ta].
6586 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6587 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6588 * [`Chain` implements `BufRead`][1.9ch].
6589 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6594 * [Cargo can now run concurrently][1.9cc].
6595 * [Top-level overrides allow specific revisions of crates to be
6596 overridden through the entire crate graph][1.9ct]. This is intended
6597 to make upgrades easier for large projects, by allowing crates to be
6598 forked temporarily until they've been upgraded and republished.
6599 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6600 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6601 on the commandline][1.9cf]. `rustc` arguments can also be specified
6602 in the `build.rustflags` configuration key.
6607 * [The time complexity of comparing variables for equivalence during type
6608 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6609 to major compilation time improvement in some scenarios.
6610 * [`ToString` is specialized for `str`, giving it the same performance
6611 as `to_owned`][1.9ts].
6612 * [Spawning processes with `Command::output` no longer creates extra
6614 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6615 for C-like enums][1.9cl].
6620 * [Passing the `--quiet` flag to a test runner will produce
6621 much-abbreviated output][1.9q].
6622 * The Rust Project now publishes std binaries for the
6623 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6624 `i586-pc-windows-msvc` targets.
6629 * [`std::sync::Once` is poisoned if its initialization function
6631 * [It is illegal to define methods with the same name in overlapping
6632 inherent `impl` blocks][1.9sn].
6633 * [`fn` item types are zero sized, and each `fn` names a unique
6634 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6635 `transmute` on a `fn` type will generate a warning for a few cycles,
6636 then will be converted to an error.
6637 * [Improvements to const evaluation may trigger new errors when integer
6638 literals are out of range][1.9ce].
6641 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6642 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6643 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6644 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6645 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6646 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6647 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6648 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6649 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6650 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6651 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6652 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6653 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6654 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6655 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6656 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6657 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6658 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6659 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6660 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6661 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6662 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6663 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6664 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6665 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6666 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6667 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6668 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6669 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6670 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6671 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6672 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6673 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6674 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6675 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6676 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6677 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6678 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6679 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6680 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6681 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6682 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6683 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6684 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6685 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6686 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6687 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6688 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6689 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6690 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6691 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6692 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6693 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6694 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6695 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6696 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6697 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6698 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6699 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6700 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6701 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6702 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6703 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6704 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6705 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6706 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6707 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6708 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6709 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6710 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6711 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6712 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6713 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6714 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6715 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6716 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6717 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6718 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6719 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6720 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6721 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6722 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6723 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6724 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6725 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6726 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6727 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6728 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6729 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6730 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6731 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6732 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6733 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6734 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6735 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6736 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6737 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6738 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6739 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6740 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6741 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6742 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6743 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6744 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6745 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6746 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6747 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6748 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6749 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6750 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6753 Version 1.8.0 (2016-04-14)
6754 ==========================
6759 * Rust supports overloading of compound assignment statements like
6760 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6761 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6762 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6764 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6765 addition to the non-braced form, `struct Foo;`. [RFC 218].
6771 * [`str::encode_utf16`] (renamed from `utf16_units`)
6772 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6775 * [`ptr::drop_in_place`]
6777 * [`time::SystemTime`]
6779 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6780 * [`Instant::elapsed`]
6781 * [`SystemTime::now`]
6782 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6783 * [`SystemTime::elapsed`]
6784 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6785 * [`SystemTimeError`]
6786 * [`SystemTimeError::duration`]
6787 * Various impls for `SystemTimeError`
6789 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6790 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6791 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6792 * [The `write!` and `writeln!` macros correctly emit errors if any of
6793 their arguments can't be formatted][1.8w].
6794 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6795 * [The Unix-specific `raw` modules, which contain a number of
6796 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6797 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6798 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6799 across platforms was making it difficult to implement `std`
6800 correctly. Those that need these definitions should use the `libc`
6802 * The Unix-specific `MetadataExt` traits, including
6803 `os::unix::fs::MetadataExt`, which expose values such as inode
6804 numbers [no longer return platform-specific types][1.8r], but
6805 instead return widened integers. [RFC 1415].
6806 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6807 * [Atomic loads and stores are not volatile][1.8a].
6808 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6813 * [Inlining hash functions lead to a 3% compile-time improvement in
6814 some workloads][1.8h].
6815 * When using jemalloc, its symbols are [unprefixed so that it
6816 overrides the libc malloc implementation][1.8h]. This means that for
6817 rustc, LLVM is now using jemalloc, which results in a 6%
6818 compile-time improvement on a specific workload.
6819 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6824 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6825 i686-pc-windows-msvc is now considered a tier-1 platform.
6826 * [The `--print targets` flag prints a list of supported targets][1.8t].
6827 * [The `--print cfg` flag prints the `cfg`s defined for the current
6829 * [`rustc` can be built with an new Cargo-based build system, written
6830 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6831 build system. To enable it configure with `configure --rustbuild`.
6832 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6833 variants while also indicating the total number of missing variants
6834 if more than 3][1.8m].
6835 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6836 * The Rust Project now publishes binary releases of the standard
6837 library for a number of tier-2 targets:
6838 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6839 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6840 `x86_64-rumprun-netbsd`. These can be installed with
6841 tools such as [multirust][1.8mr].
6846 * [`cargo init` creates a new Cargo project in the current
6847 directory][1.8ci]. It is otherwise like `cargo new`.
6848 * [Cargo has configuration keys for `-v` and
6849 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6850 `[term]` section of `.cargo/config`.
6851 * [Configuration keys that evaluate to strings or integers can be set
6852 via environment variables][1.8ce]. For example the `build.jobs` key
6853 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6854 precedence over config files.
6855 * [Target-specific dependencies support Rust `cfg` syntax for
6856 describing targets][1.8cfg] so that dependencies for multiple
6857 targets can be specified together. [RFC 1361].
6858 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6859 `RUSTDOC` take precedence over the `build.target-dir`,
6860 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6861 * [The child process tree is killed on Windows when Cargo is
6863 * [The `build.target` configuration value sets the target platform,
6864 like `--target`][1.8ct].
6869 * [Unstable compiler flags have been further restricted][1.8u]. Since
6870 1.0 `-Z` flags have been considered unstable, and other flags that
6871 were considered unstable additionally required passing `-Z
6872 unstable-options` to access. Unlike unstable language and library
6873 features though, these options have been accessible on the stable
6874 release channel. Going forward, *new unstable flags will not be
6875 available on the stable release channel*, and old unstable flags
6876 will warn about their usage. In the future, all unstable flags will
6877 be unavailable on the stable release channel.
6878 * [It is no longer possible to `match` on empty enum variants using
6879 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6880 * The Unix-specific `MetadataExt` traits, including
6881 `os::unix::fs::MetadataExt`, which expose values such as inode
6882 numbers [no longer return platform-specific types][1.8r], but
6883 instead return widened integers. [RFC 1415].
6884 * [Modules sourced from the filesystem cannot appear within arbitrary
6885 blocks, but only within other modules][1.8mf].
6886 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6887 * On Unix, [stack overflow triggers a runtime abort instead of a
6889 * [`Command::spawn` and its equivalents return an error if any of
6890 its command-line arguments contain interior `NUL`s][1.8n].
6891 * [Tuple and unit enum variants from other crates are in the type
6893 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6894 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6895 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6896 instead of `foo.lib`.
6899 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6900 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6901 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6902 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6903 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6904 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6905 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6906 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6907 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6908 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6909 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6910 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6911 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6912 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6913 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6914 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6915 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6916 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6917 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6918 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6919 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6920 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6921 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6922 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6923 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6924 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6925 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6926 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6927 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6928 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6929 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6930 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6931 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6932 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6933 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6934 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6935 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6936 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6937 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6938 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6939 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6940 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6941 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6942 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6943 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6944 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6945 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6946 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6947 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6948 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6949 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6950 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6951 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6952 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6953 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6954 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6955 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6956 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6957 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6958 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6961 Version 1.7.0 (2016-03-03)
6962 ==========================
6969 * [`Path::strip_prefix`] (renamed from relative_from)
6970 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6972 * [`Ipv4Addr::is_loopback`]
6973 * [`Ipv4Addr::is_private`]
6974 * [`Ipv4Addr::is_link_local`]
6975 * [`Ipv4Addr::is_multicast`]
6976 * [`Ipv4Addr::is_broadcast`]
6977 * [`Ipv4Addr::is_documentation`]
6979 * [`Ipv6Addr::is_unspecified`]
6980 * [`Ipv6Addr::is_loopback`]
6981 * [`Ipv6Addr::is_multicast`]
6984 * [`Vec::as_mut_slice`]
6986 * [`String::as_str`]
6987 * [`String::as_mut_str`]
6989 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6991 * `<[T]>::`[`sort_by_key`]
6992 * checked, saturated, and overflowing operations
6993 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6994 * [`i32::saturating_mul`]
6995 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6996 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6997 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6998 * [`u32::saturating_mul`]
6999 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7000 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7001 * and checked, saturated, and overflowing operations for other primitive types
7003 * [`ffi::IntoStringError`]
7004 * [`CString::into_string`]
7005 * [`CString::into_bytes`]
7006 * [`CString::into_bytes_with_nul`]
7007 * `From<CString> for Vec<u8>`
7009 * [`IntoStringError::into_cstring`]
7010 * [`IntoStringError::utf8_error`]
7011 * `Error for IntoStringError`
7013 * [`std::hash::BuildHasher`]
7014 * [`BuildHasher::Hasher`]
7015 * [`BuildHasher::build_hasher`]
7016 * [`std::hash::BuildHasherDefault`]
7017 * [`HashMap::with_hasher`]
7018 * [`HashMap::with_capacity_and_hasher`]
7019 * [`HashSet::with_hasher`]
7020 * [`HashSet::with_capacity_and_hasher`]
7021 * [`std::collections::hash_map::RandomState`]
7022 * [`RandomState::new`]
7023 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7024 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7025 from bytes is faster.
7026 * [The performance of `LineWriter` (and thus `io::stdout`) was
7027 improved by using `memchr` to search for newlines][1.7m].
7028 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7029 `f64` variants were stabilized previously.
7030 * [`BTreeMap` was rewritten to use less memory and improve the performance
7031 of insertion and iteration, the latter by as much as 5x][1.7bm].
7032 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7033 covariant over their contained type][1.7bt].
7034 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7035 over their contained type][1.7ll].
7036 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7038 * [`Any` is implemented for unsized types][1.7a].
7039 * [`Hash` is implemented for `Duration`][1.7h].
7044 * [When running tests with `--test`, rustdoc will pass `--cfg`
7045 arguments to the compiler][1.7dt].
7046 * [The compiler is built with RPATH information by default][1.7rpa].
7047 This means that it will be possible to run `rustc` when installed in
7048 unusual configurations without configuring the dynamic linker search
7050 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7051 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7052 over `LD_LIBRARY_PATH`.
7057 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7058 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7059 * [The `rerun-if-changed` build script directive no longer causes the
7060 build script to incorrectly run twice in certain scenarios][1.7rr].
7065 * Soundness fixes to the interactions between associated types and
7066 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7067 code that violates the new rules. This is a significant change that
7068 is known to break existing code, so it has emitted warnings for the
7069 new error cases since 1.4 to give crate authors time to adapt. The
7070 details of what is changing are subtle; read the RFC for more.
7071 * [Several bugs in the compiler's visibility calculations were
7072 fixed][1.7v]. Since this was found to break significant amounts of
7073 code, the new errors will be emitted as warnings for several release
7074 cycles, under the `private_in_public` lint.
7075 * Defaulted type parameters were accidentally accepted in positions
7076 that were not intended. In this release, [defaulted type parameters
7077 appearing outside of type definitions will generate a
7078 warning][1.7d], which will become an error in future releases.
7079 * [Parsing "." as a float results in an error instead of 0][1.7p].
7080 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7081 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7083 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7084 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7085 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7086 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7087 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7088 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7089 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7090 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7091 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7092 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7093 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7094 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7095 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7096 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7097 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7098 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7099 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7100 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7101 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7102 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7103 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7104 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7105 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7106 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7107 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7108 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7109 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7110 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7111 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7112 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7113 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7114 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7115 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7116 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7117 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7118 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7119 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7120 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7121 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7122 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7123 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7124 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7125 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7126 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7127 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7128 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7129 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7130 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7131 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7132 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7133 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7134 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7135 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7136 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7137 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7138 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7139 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7140 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7141 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7142 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7143 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7144 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7145 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7146 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7147 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7148 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7149 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7150 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7151 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7152 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7153 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7154 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7155 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7156 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7157 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7158 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7159 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7160 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7161 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7164 Version 1.6.0 (2016-01-21)
7165 ==========================
7170 * The `#![no_std]` attribute causes a crate to not be linked to the
7171 standard library, but only the [core library][1.6co], as described
7172 in [RFC 1184]. The core library defines common types and traits but
7173 has no platform dependencies whatsoever, and is the basis for Rust
7174 software in environments that cannot support a full port of the
7175 standard library, such as operating systems. Most of the core
7176 library is now stable.
7182 [`Read::read_exact`],
7183 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7184 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7185 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7186 [`os::unix::fs::DirBuilderExt`],
7187 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7188 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7189 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7190 [`collections::hash_map::Drain`],
7191 [`collections::hash_map::HashMap::drain`],
7192 [`collections::hash_set::Drain`],
7193 [`collections::hash_set::HashSet::drain`],
7194 [`collections::binary_heap::Drain`],
7195 [`collections::binary_heap::BinaryHeap::drain`],
7196 [`Vec::extend_from_slice`] (renamed from `push_all`),
7197 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7198 [`RwLock::into_inner`],
7199 [`Iterator::min_by_key`] (renamed from `min_by`),
7200 [`Iterator::max_by_key`] (renamed from `max_by`).
7201 * The [core library][1.6co] is stable, as are most of its APIs.
7202 * [The `assert_eq!` macro supports arguments that don't implement
7203 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7205 * Several timer functions that take duration in milliseconds [are
7206 deprecated in favor of those that take `Duration`][1.6ms]. These
7207 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7208 `thread::park_timeout_ms`.
7209 * The algorithm by which `Vec` reserves additional elements was
7210 [tweaked to not allocate excessive space][1.6a] while still growing
7212 * `From` conversions are [implemented from integers to floats][1.6f]
7213 in cases where the conversion is lossless. Thus they are not
7214 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7215 or `f64`. They are also not implemented for `isize` and `usize`
7216 because the implementations would be platform-specific. `From` is
7217 also implemented from `f32` to `f64`.
7218 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7219 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7220 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7221 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7223 * Sorting slices that are already sorted [is 50% faster in some
7229 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7230 * Cargo build scripts can specify their dependencies by emitting the
7231 [`rerun-if-changed`][1.6rr] key.
7232 * crates.io will reject publication of crates with dependencies that
7233 have a wildcard version constraint. Crates with wildcard
7234 dependencies were seen to cause a variety of problems, as described
7235 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7237 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7238 release folder. A variety of artifacts that Cargo failed to clean
7239 are now correctly deleted.
7244 * The `unreachable_code` lint [warns when a function call's argument
7246 * The parser indicates [failures that may be caused by
7247 confusingly-similar Unicode characters][1.6uc]
7248 * Certain macro errors [are reported at definition time][1.6m], not
7254 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7255 environment variable when locating crates. This was a pre-cargo
7256 feature for integrating with the package manager that was
7257 accidentally never removed.
7258 * [A number of bugs were fixed in the privacy checker][1.6p] that
7259 could cause previously-accepted code to break.
7260 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7261 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7262 struct pattern syntax (`Foo(..)`) can no longer be used to match
7263 unit structs. This is a warning now, but will become an error in
7264 future releases. Patterns that share the same name as a const are
7266 * A bug was fixed that causes [rustc not to apply default type
7267 parameters][1.6xc] when resolving certain method implementations of
7268 traits defined in other crates.
7270 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7271 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7272 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7273 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7274 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7275 [1.6co]: http://doc.rust-lang.org/core/index.html
7276 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7277 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7278 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7279 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7280 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7281 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7282 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7283 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7284 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7285 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7286 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7287 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7288 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7289 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7290 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7291 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7292 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7293 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7294 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7295 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7296 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7297 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7298 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7299 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7300 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7301 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7302 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7303 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7304 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7305 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7306 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7307 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7308 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7309 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7310 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7311 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7312 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7313 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7314 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7315 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7316 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7319 Version 1.5.0 (2015-12-10)
7320 ==========================
7322 * ~700 changes, numerous bugfixes
7328 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7329 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7330 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7331 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7332 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7333 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7334 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7335 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7336 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7337 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7338 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7339 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7340 [`Path::read_link`], [`Path::symlink_metadata`],
7341 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7342 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7343 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7344 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7345 [`slice::split_first_mut`], [`slice::split_first`],
7346 [`slice::split_last_mut`], [`slice::split_last`],
7347 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7348 [`str::MatchIndices`], [`str::RMatchIndices`],
7349 [`str::match_indices`], [`str::rmatch_indices`],
7350 [`str::slice_mut_unchecked`], [`string::ParseError`].
7351 * Rust applications hosted on crates.io can be installed locally to
7352 `~/.cargo/bin` with the [`cargo install`] command. Among other
7353 things this makes it easier to augment Cargo with new subcommands:
7354 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7355 invoked as `cargo foo`.
7356 * Crates with wildcard (`*`) dependencies will [emit warnings when
7357 published][1.5w]. In 1.6 it will no longer be possible to publish
7358 crates with wildcard dependencies.
7363 * The rules determining when a particular lifetime must outlive
7364 a particular value (known as '[dropck]') have been [modified
7365 to not rely on parametricity][1.5p].
7366 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7367 and `Arc`][1.5a]. Because these smart pointer types implement
7368 `Deref`, this causes breakage in cases where the interior type
7369 contains methods of the same name.
7370 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7371 that they could drop their content. Soundness fix.
7372 * All method invocations are [properly checked][1.5wf1] for
7373 [well-formedness][1.5wf2]. Soundness fix.
7374 * Traits whose supertraits contain `Self` are [not object
7375 safe][1.5o]. Soundness fix.
7376 * Target specifications support a [`no_default_libraries`][1.5nd]
7377 setting that controls whether `-nodefaultlibs` is passed to the
7378 linker, and in turn the `is_like_windows` setting no longer affects
7379 the `-nodefaultlibs` flag.
7380 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7381 * The `#[inline]` and `#[repr]` attributes [can only appear
7382 in valid locations][1.5at].
7383 * Native libraries linked from the local crate are [passed to
7384 the linker before native libraries from upstream crates][1.5nl].
7385 * Two rarely-used attributes, `#[no_debug]` and
7386 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7387 * Negation of unsigned integers, which has been a warning for
7388 several releases, [is now behind a feature gate and will
7389 generate errors][1.5nu].
7390 * The parser accidentally accepted visibility modifiers on
7391 enum variants, a bug [which has been fixed][1.5ev].
7392 * [A bug was fixed that allowed `use` statements to import unstable
7398 * When evaluating expressions at compile-time that are not
7399 compile-time constants (const-evaluating expressions in non-const
7400 contexts), incorrect code such as overlong bitshifts and arithmetic
7401 overflow will [generate a warning instead of an error][1.5ce],
7402 delaying the error until runtime. This will allow the
7403 const-evaluator to be expanded in the future backwards-compatibly.
7404 * The `improper_ctypes` lint [no longer warns about using `isize` and
7405 `usize` in FFI][1.5ict].
7410 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7412 * `Default` is [implemented for mutable slices][1.5d].
7413 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7414 * There are now `From` conversions [between floating point
7415 types][1.5f] where the conversions are lossless.
7416 * There are now `From` conversions [between integer types][1.5i] where
7417 the conversions are lossless.
7418 * [`fs::Metadata` implements `Clone`][1.5fs].
7419 * The `parse` method [accepts a leading "+" when parsing
7421 * [`AsMut` is implemented for `Vec`][1.5am].
7422 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7423 been optimized][1.5cf] and no longer rely on the default impl.
7424 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7425 `unsafe extern "C"` function types now [implement `Clone`,
7426 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7427 `fmt::Debug` for up to 12 arguments][1.5fp].
7428 * [Dropping `Vec`s is much faster in unoptimized builds when the
7429 element types don't implement `Drop`][1.5dv].
7430 * A bug that caused in incorrect behavior when [combining `VecDeque`
7431 with zero-sized types][1.5vdz] was resolved.
7432 * [`PartialOrd` for slices is faster][1.5po].
7437 * [Crate metadata size was reduced by 20%][1.5md].
7438 * [Improvements to code generation reduced the size of libcore by 3.3
7439 MB and rustc's memory usage by 18MB][1.5m].
7440 * [Improvements to deref translation increased performance in
7441 unoptimized builds][1.5dr].
7442 * Various errors in trait resolution [are deduplicated to only be
7443 reported once][1.5te].
7444 * Rust has preliminary [support for rumprun kernels][1.5rr].
7445 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7447 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7448 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7449 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7450 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7451 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7452 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7453 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7454 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7455 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7456 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7457 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7458 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7459 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7460 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7461 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7462 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7463 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7464 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7465 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7466 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7467 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7468 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7469 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7470 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7471 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7472 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7473 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7474 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7475 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7476 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7477 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7478 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7479 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7480 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7481 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7482 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7483 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7484 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7485 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7486 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7487 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7488 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7489 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7490 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7491 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7492 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7493 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7494 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7495 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7496 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7497 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7498 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7499 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7500 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7501 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7502 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7503 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7504 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7505 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7506 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7507 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7508 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7509 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7510 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7511 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7512 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7513 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7514 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7515 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7516 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7517 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7518 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7519 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7520 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7521 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7522 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7523 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7524 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7525 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7526 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7527 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7528 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7529 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7530 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7531 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7532 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7533 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7534 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7535 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7537 Version 1.4.0 (2015-10-29)
7538 ==========================
7540 * ~1200 changes, numerous bugfixes
7545 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7546 GNU) are now supported and recommended for use.
7551 * [Several changes have been made to fix type soundness and improve
7552 the behavior of associated types][sound]. See [RFC 1214]. Although
7553 we have mostly introduced these changes as warnings this release, to
7554 become errors next release, there are still some scenarios that will
7555 see immediate breakage.
7556 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7557 line breaks in addition to `\n`][crlf].
7558 * [Loans of `'static` lifetime extend to the end of a function][stat].
7559 * [`str::parse` no longer introduces avoidable rounding error when
7560 parsing floating point numbers. Together with earlier changes to
7561 float formatting/output, "round trips" like f.to_string().parse()
7562 now preserve the value of f exactly. Additionally, leading plus
7563 signs are now accepted][fp3].
7569 * `use` statements that import multiple items [can now rename
7570 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7571 * [Binops work correctly on fat pointers][binfat].
7572 * `pub extern crate`, which does not behave as expected, [issues a
7573 warning][pec] until a better solution is found.
7578 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7579 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7580 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7581 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7582 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7583 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7584 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7585 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7586 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7587 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7588 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7589 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7590 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7591 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7592 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7593 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7594 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7595 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7597 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7598 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7599 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7600 `f64::from_str_radix`.
7601 * [Reverse-searching strings is faster with the 'two-way'
7603 * [`std::io::copy` allows `?Sized` arguments][cc].
7604 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7605 [override `count`, `nth` and `last` with an O(1)
7606 implementation][it].
7607 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7608 * [`IntoRawFd` has been added to the Unix-specific prelude,
7609 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7611 * [`Extend<String>` and `FromIterator<String` are both implemented for
7613 * [`IntoIterator` is implemented for references to `Option` and
7615 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7616 Copy`][ext] as part of [RFC 839]. This will cause type inference
7617 breakage in rare situations.
7618 * [`BinaryHeap` implements `Debug`][bh2].
7619 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7621 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7622 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7623 * [String comparison is faster][faststr].
7624 * `&mut T` where `T: std::fmt::Write` [also implements
7625 `std::fmt::Write`][mutw].
7626 * [A stable regression in `VecDeque::push_back` and other
7627 capacity-altering methods that caused panics for zero-sized types
7629 * [Function pointers implement traits for up to 12 parameters][fp2].
7634 * The compiler [no longer uses the 'morestack' feature to prevent
7635 stack overflow][mm]. Instead it uses guard pages and stack
7636 probes (though stack probes are not yet implemented on any platform
7638 * [The compiler matches traits faster when projections are involved][p].
7639 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7641 * [Cargo now displays useful information about what its doing during
7642 `cargo update`][cu].
7644 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7645 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7646 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7647 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7648 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7649 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7650 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7651 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7652 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7653 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7654 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7655 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7656 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7657 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7658 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7659 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7660 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7661 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7662 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7663 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7664 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7665 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7666 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7667 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7668 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7669 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7670 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7671 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7672 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7673 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7674 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7675 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7676 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7677 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7678 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7679 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7680 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7681 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7682 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7683 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7684 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7685 [bh2]: https://github.com/rust-lang/rust/pull/28156
7686 [binfat]: https://github.com/rust-lang/rust/pull/28270
7687 [bm]: https://github.com/rust-lang/rust/pull/28197
7688 [cc]: https://github.com/rust-lang/rust/pull/27531
7689 [crlf]: https://github.com/rust-lang/rust/pull/28034
7690 [cu]: https://github.com/rust-lang/cargo/pull/1931
7691 [d]: https://github.com/rust-lang/rust/pull/27825
7692 [dep]: https://github.com/rust-lang/rust/pull/28339
7693 [es]: https://github.com/rust-lang/rust/pull/27956
7694 [ext]: https://github.com/rust-lang/rust/pull/28094
7695 [faststr]: https://github.com/rust-lang/rust/pull/28338
7696 [ffi]: https://github.com/rust-lang/rust/pull/28779
7697 [fp]: https://github.com/rust-lang/rust/pull/28268
7698 [fp2]: https://github.com/rust-lang/rust/pull/28560
7699 [fp3]: https://github.com/rust-lang/rust/pull/27307
7700 [i]: https://github.com/rust-lang/rust/pull/27451
7701 [into2]: https://github.com/rust-lang/rust/pull/28039
7702 [it]: https://github.com/rust-lang/rust/pull/27652
7703 [mm]: https://github.com/rust-lang/rust/pull/27338
7704 [mutw]: https://github.com/rust-lang/rust/pull/28368
7705 [sound]: https://github.com/rust-lang/rust/pull/27641
7706 [p]: https://github.com/rust-lang/rust/pull/27866
7707 [pec]: https://github.com/rust-lang/rust/pull/28486
7708 [pr]: https://github.com/rust-lang/rust/pull/27896
7709 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7710 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7711 [s]: https://github.com/rust-lang/rust/pull/27474
7712 [stab]: https://github.com/rust-lang/rust/pull/28339
7713 [stat]: https://github.com/rust-lang/rust/pull/28321
7714 [vd]: https://github.com/rust-lang/rust/pull/28494
7716 Version 1.3.0 (2015-09-17)
7717 ==============================
7719 * ~900 changes, numerous bugfixes
7724 * The [new object lifetime defaults][nold] have been [turned
7725 on][nold2] after a cycle of warnings about the change. Now types
7726 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7727 being interpreted as `&'a Box<Trait+'a>` to `&'a
7728 Box<Trait+'static>`.
7729 * [The Rustonomicon][nom] is a new book in the official documentation
7730 that dives into writing unsafe Rust.
7731 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7732 timekeeping is employed by other std APIs, as well as out-of-tree
7738 * The [new object lifetime defaults][nold] have been [turned
7739 on][nold2] after a cycle of warnings about the change.
7740 * There is a known [regression][lr] in how object lifetime elision is
7741 interpreted, the proper solution for which is undetermined.
7742 * The `#[prelude_import]` attribute, an internal implementation
7743 detail, was accidentally stabilized previously. [It has been put
7744 behind the `prelude_import` feature gate][pi]. This change is
7745 believed to break no existing code.
7746 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7747 [more sane for dynamically sized types][dst3]. Code that relied on
7748 the previous behavior is thought to be broken.
7749 * The `dropck` rules, which checks that destructors can't access
7750 destroyed values, [have been updated][dropck] to match the
7751 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7752 cause some previously-compiling code to no longer build.
7757 * The [new object lifetime defaults][nold] have been [turned
7758 on][nold2] after a cycle of warnings about the change.
7759 * Semicolons may [now follow types and paths in
7760 macros](https://github.com/rust-lang/rust/pull/27000).
7761 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7762 [more sane for dynamically sized types][dst3]. Code that relied on
7763 the previous behavior is not known to exist, and suspected to be
7765 * `'static` variables [may now be recursive][st].
7766 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7767 implementations correctly.
7768 * The `dropck` rules, which checks that destructors can't access
7769 destroyed values, [have been updated][dropck] to match the
7775 * The [`Duration`] API, [has been stabilized][ds], as well as the
7776 `std::time` module, which presently contains only `Duration`.
7777 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7778 * The owned C string, [`CString`], implements [`Borrow`] and the
7779 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7780 these allow C strings to be borrowed and cloned in generic code.
7781 * [`CStr`] implements [`Debug`].
7782 * [`AtomicPtr`] implements [`Debug`].
7783 * [`Error`] trait objects [can be downcast to their concrete types][e]
7784 in many common configurations, using the [`is`], [`downcast`],
7785 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7787 * Searching for substrings now [employs the two-way algorithm][search]
7788 instead of doing a naive search. This gives major speedups to a
7789 number of methods, including [`contains`][sc], [`find`][sf],
7790 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7791 [`ends_with`][sew] are also faster.
7792 * The performance of `PartialEq` for slices is [much faster][ps].
7793 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7794 is overridden and optimized by the implementations for scalars.
7795 * The [`Hasher`] trait now has a number of specialized `write_*`
7796 methods for primitive types, for efficiency.
7797 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7798 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7799 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7800 of [`std::error::Error::cause`][iec] also delegates to the inner
7802 * [`process::Child`][pc] gained the [`id`] method, which returns a
7803 `u32` representing the platform-specific process identifier.
7804 * The [`connect`] method on slices is deprecated, replaced by the new
7805 [`join`] method (note that both of these are on the *unstable*
7806 [`SliceConcatExt`] trait, but through the magic of the prelude are
7807 available to stable code anyway).
7808 * The [`Div`] operator is implemented for [`Wrapping`] types.
7809 * [`DerefMut` is implemented for `String`][dms].
7810 * Performance of SipHash (the default hasher for `HashMap`) is
7811 [better for long data][sh].
7812 * [`AtomicPtr`] implements [`Send`].
7813 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7814 are now [specialized to use uninitialized buffers for increased
7816 * Lifetime parameters of foreign functions [are now resolved
7822 * Rust can now, with some coercion, [produce programs that run on
7823 Windows XP][xp], though XP is not considered a supported platform.
7824 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7825 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7826 recommended for use in 1.3, though should be fully-functional
7827 in the [64-bit 1.4 beta][b14].
7828 * On Fedora-based systems installation will [properly configure the
7829 dynamic linker][fl].
7830 * The compiler gained many new extended error descriptions, which can
7831 be accessed with the `--explain` flag.
7832 * The `dropck` pass, which checks that destructors can't access
7833 destroyed values, [has been rewritten][dropck]. This fixes some
7834 soundness holes, and as such will cause some previously-compiling
7835 code to no longer build.
7836 * `rustc` now uses [LLVM to write archive files where possible][ar].
7837 Eventually this will eliminate the compiler's dependency on the ar
7839 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7840 supported FreeBSD on x86_64).
7841 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7842 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7844 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7845 will kill the process instead of leaking][nlp].
7847 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7848 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7849 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7850 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7851 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7852 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7853 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7854 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7855 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7856 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7857 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7858 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7859 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7860 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7861 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7862 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7863 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7864 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7865 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7866 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7867 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7868 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7869 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7870 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7871 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7872 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7873 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7874 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7875 [ar]: https://github.com/rust-lang/rust/pull/26926
7876 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7877 [dms]: https://github.com/rust-lang/rust/pull/26241
7878 [dropck]: https://github.com/rust-lang/rust/pull/27261
7879 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7880 [ds]: https://github.com/rust-lang/rust/pull/26818
7881 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7882 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7883 [dst3]: https://github.com/rust-lang/rust/pull/27351
7884 [e]: https://github.com/rust-lang/rust/pull/24793
7885 [f]: https://github.com/rust-lang/rust/pull/26588
7886 [fb]: https://github.com/rust-lang/rust/pull/26959
7887 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7888 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7889 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7890 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7891 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7892 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7893 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7894 [lic]: https://github.com/rust-lang/rust/pull/26583
7895 [lnu]: https://github.com/rust-lang/rust/pull/27026
7896 [lr]: https://github.com/rust-lang/rust/issues/27248
7897 [lum]: https://github.com/rust-lang/rust/pull/26378
7898 [lur]: https://github.com/rust-lang/rust/pull/26783
7899 [nlp]: https://github.com/rust-lang/rust/pull/27176
7900 [nold2]: https://github.com/rust-lang/rust/pull/27045
7901 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7902 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7903 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7904 [pi]: https://github.com/rust-lang/rust/pull/26699
7905 [ps]: https://github.com/rust-lang/rust/pull/26884
7906 [rte]: https://github.com/rust-lang/rust/pull/26950
7907 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7908 [search]: https://github.com/rust-lang/rust/pull/26327
7909 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7910 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7911 [sh]: https://github.com/rust-lang/rust/pull/27280
7912 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7913 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7914 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7915 [st]: https://github.com/rust-lang/rust/pull/26630
7916 [win1]: https://github.com/rust-lang/rust/pull/26569
7917 [win2]: https://github.com/rust-lang/rust/pull/26741
7918 [win3]: https://github.com/rust-lang/rust/pull/26741
7919 [win4]: https://github.com/rust-lang/rust/pull/27210
7920 [xp]: https://github.com/rust-lang/rust/pull/26569
7922 Version 1.2.0 (2015-08-07)
7923 ==========================
7925 * ~1200 changes, numerous bugfixes
7930 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7931 like `Rc` to contain types without a fixed size, arrays and trait
7932 objects, finally enabling use of `Rc<[T]>` and completing the
7933 implementation of DST.
7934 * [Parallel codegen][parcodegen] is now working again, which can
7935 substantially speed up large builds in debug mode; It also gets
7936 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7937 jobs). It's not enabled by default, but will be "in the near
7938 future". It can be activated with the `-C codegen-units=N` flag to
7940 * This is the first release with [experimental support for linking
7941 with the MSVC linker and lib C on Windows (instead of using the GNU
7942 variants via MinGW)][win]. It is yet recommended only for the most
7943 intrepid Rustaceans.
7944 * Benchmark compilations are showing a 30% improvement in
7945 bootstrapping over 1.1.
7950 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7951 unicode case mapping, which is a previously-planned change in
7952 behavior and considered a bugfix.
7953 * [`mem::align_of`] now specifies [the *minimum alignment* for
7954 T][align], which is usually the alignment programs are interested
7955 in, and the same value reported by clang's
7956 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7958 * [The `#[packed]` attribute is no longer silently accepted by the
7959 compiler][packed]. This attribute did nothing and code that
7960 mentioned it likely did not work as intended.
7961 * Associated type defaults are [now behind the
7962 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7963 defaults *did not work*, but could be mentioned syntactically. As
7964 such this breakage has minimal impact.
7969 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7970 matching against dereferenceable values.
7975 * The [`Extend`] trait, which grows a collection from an iterator, is
7976 implemented over iterators of references, for `String`, `Vec`,
7977 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7978 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7979 * The [`iter::once`] function returns an iterator that yields a single
7980 element, and [`iter::empty`] returns an iterator that yields no
7982 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7983 over substring matches.
7984 * [`Cell`] and [`RefCell`] both implement `Eq`.
7985 * A number of methods for wrapping arithmetic are added to the
7986 integral types, [`wrapping_div`], [`wrapping_rem`],
7987 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7988 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7989 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7990 type.. It is illegal for the default arithmetic operations in Rust
7991 to overflow; the desire to wrap must be explicit.
7992 * The `{:#?}` formatting specifier [displays the alternate,
7993 pretty-printed][debugfmt] form of the `Debug` formatter. This
7994 feature was actually introduced prior to 1.0 with little
7996 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7997 for writing data to formatted strings, similar to [`io::Write`].
7998 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7999 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8000 are used by code generators to emit implementations of [`Debug`].
8001 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8002 methods that convert case, following Unicode case mapping.
8003 * It is now easier to handle poisoned locks. The [`PoisonError`]
8004 type, returned by failing lock operations, exposes `into_inner`,
8005 `get_ref`, and `get_mut`, which all give access to the inner lock
8006 guard, and allow the poisoned lock to continue to operate. The
8007 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8008 poisoned lock without attempting to take the lock.
8009 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8010 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8011 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8012 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8014 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8020 * `rustc` employs smarter heuristics for guessing at [typos].
8021 * `rustc` emits more efficient code for [no-op conversions between
8022 unsafe pointers][nop].
8023 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8024 resulting in faster compile times and smaller code.
8026 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8027 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8028 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8029 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8030 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8031 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8032 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8033 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8034 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8035 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8036 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8037 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8038 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8039 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8040 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8041 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8042 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8043 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8044 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8045 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8046 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8047 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8048 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8049 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8050 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8051 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8052 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8053 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8054 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8055 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8056 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8057 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8058 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8059 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8060 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8061 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8062 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8063 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8064 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8065 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8066 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8067 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8068 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8069 [align]: https://github.com/rust-lang/rust/pull/25646
8070 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8071 [typos]: https://github.com/rust-lang/rust/pull/26087
8072 [nop]: https://github.com/rust-lang/rust/pull/26336
8073 [fat]: https://github.com/rust-lang/rust/pull/26411
8074 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8075 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8076 [packed]: https://github.com/rust-lang/rust/pull/25541
8077 [ad]: https://github.com/rust-lang/rust/pull/27382
8078 [win]: https://github.com/rust-lang/rust/pull/25350
8080 Version 1.1.0 (2015-06-25)
8081 =========================
8083 * ~850 changes, numerous bugfixes
8088 * The [`std::fs` module has been expanded][fs] to expand the set of
8089 functionality exposed:
8090 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8091 don't incur a syscall on some platforms.
8092 * A `symlink_metadata` function has been added.
8093 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8094 access to all underlying information.
8095 * The compiler now contains extended explanations of many errors. When an error
8096 with an explanation occurs the compiler suggests using the `--explain` flag
8097 to read the explanation. Error explanations are also [available online][err-index].
8098 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8099 well as other work, the time to bootstrap the compiler decreased by
8105 * The [`str::split_whitespace`] method splits a string on unicode
8106 whitespace boundaries.
8107 * On both Windows and Unix, new extension traits provide conversion of
8108 I/O types to and from the underlying system handles. On Unix, these
8109 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8110 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8111 `TcpListener`, and `UpdSocket`. Further implementations for
8112 `std::process` will be stabilized later.
8113 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8114 Windows, symlinks can be created with
8115 `std::os::windows::symlink_dir` and
8116 `std::os::windows::symlink_file`.
8117 * The `mpsc::Receiver` type can now be converted into an iterator with
8118 `into_iter` on the [`IntoIterator`] trait.
8119 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8120 implementation of the [`From`] trait.
8121 * The `Debug` implementation for `RangeFull` [creates output that is
8122 more consistent with other implementations][rf].
8123 * [`Debug` is implemented for `File`][file].
8124 * The `Default` implementation for `Arc` [no longer requires `Sync +
8126 * [The `Iterator` methods `count`, `nth`, and `last` have been
8127 overridden for slices to have O(1) performance instead of O(n)][si].
8128 * Incorrect handling of paths on Windows has been improved in both the
8129 compiler and the standard library.
8130 * [`AtomicPtr` gained a `Default` implementation][ap].
8131 * In accordance with Rust's policy on arithmetic overflow `abs` now
8132 [panics on overflow when debug assertions are enabled][abs].
8133 * The [`Cloned`] iterator, which was accidentally left unstable for
8134 1.0 [has been stabilized][c].
8135 * The [`Incoming`] iterator, which iterates over incoming TCP
8136 connections, and which was accidentally unnamable in 1.0, [is now
8137 properly exported][inc].
8138 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8139 `sift_up` or `sift_down` panic][bh].
8140 * The [`split_off`] method of `LinkedList` [no longer corrupts
8141 the list in certain scenarios][ll].
8146 * Type checking performance [has improved notably][sk] with
8147 [multiple improvements][pre].
8148 * The compiler [suggests code changes][ch] for more errors.
8149 * rustc and it's build system have experimental support for [building
8150 toolchains against MUSL][m] instead of glibc on Linux.
8151 * The compiler defines the `target_env` cfg value, which is used for
8152 distinguishing toolchains that are otherwise for the same
8153 platform. Presently this is set to `gnu` for common GNU Linux
8154 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8155 * The [`cargo rustc`][crc] command invokes a build with custom flags
8157 * [Android executables are always position independent][pie].
8158 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8161 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8162 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8163 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8164 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8165 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8166 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8167 [rf]: https://github.com/rust-lang/rust/pull/24491
8168 [err-index]: https://doc.rust-lang.org/error-index.html
8169 [sk]: https://github.com/rust-lang/rust/pull/24615
8170 [pre]: https://github.com/rust-lang/rust/pull/25323
8171 [file]: https://github.com/rust-lang/rust/pull/24598
8172 [ch]: https://github.com/rust-lang/rust/pull/24683
8173 [arc]: https://github.com/rust-lang/rust/pull/24695
8174 [si]: https://github.com/rust-lang/rust/pull/24701
8175 [ap]: https://github.com/rust-lang/rust/pull/24834
8176 [m]: https://github.com/rust-lang/rust/pull/24777
8177 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8178 [crc]: https://github.com/rust-lang/cargo/pull/1568
8179 [pie]: https://github.com/rust-lang/rust/pull/24953
8180 [abs]: https://github.com/rust-lang/rust/pull/25441
8181 [c]: https://github.com/rust-lang/rust/pull/25496
8182 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8183 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8184 [inc]: https://github.com/rust-lang/rust/pull/25522
8185 [bh]: https://github.com/rust-lang/rust/pull/25856
8186 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8187 [ll]: https://github.com/rust-lang/rust/pull/26022
8188 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8189 [drop]: https://github.com/rust-lang/rust/pull/24935
8191 Version 1.0.0 (2015-05-15)
8192 ========================
8194 * ~1500 changes, numerous bugfixes
8199 * The vast majority of the standard library is now `#[stable]`. It is
8200 no longer possible to use unstable features with a stable build of
8202 * Many popular crates on [crates.io] now work on the stable release
8204 * Arithmetic on basic integer types now [checks for overflow in debug
8210 * Several [restrictions have been added to trait coherence][coh] in
8211 order to make it easier for upstream authors to change traits
8212 without breaking downstream code.
8213 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8214 improve error messages and macro behavior. For example, `0b1234` is
8215 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8216 * Trait bounds [are always invariant][inv], eliminating the need for
8217 the `PhantomFn` and `MarkerTrait` lang items, which have been
8219 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8220 "foo" as bar` syntax has been replaced with `extern crate foo as
8221 bar`, and Cargo now automatically translates "-" in *package* names
8222 to underscore for the crate name.
8223 * [Lifetime shadowing is an error][lt].
8224 * [`Send` no longer implies `'static`][send-rfc].
8225 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8226 `MyType::default()`.
8227 * Primitive types [now have inherent methods][prim-inherent],
8228 obviating the need for extension traits like `SliceExt`.
8229 * Methods with `Self: Sized` in their `where` clause are [considered
8230 object-safe][self-sized], allowing many extension traits like
8231 `IteratorExt` to be merged into the traits they extended.
8232 * You can now [refer to associated types][assoc-where] whose
8233 corresponding trait bounds appear only in a `where` clause.
8234 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8235 like `Send` and `Sync` are now library-defined.
8236 * A [Reflect trait][reflect] was introduced, which means that
8237 downcasting via the `Any` trait is effectively limited to concrete
8238 types. This helps retain the potentially-important "parametricity"
8239 property: generic code cannot behave differently for different type
8240 arguments except in minor ways.
8241 * The `unsafe_destructor` feature is now deprecated in favor of the
8242 [new `dropck`][dropck]. This change is a major reduction in unsafe
8248 * The `thread_local` module [has been renamed to `std::thread`][th].
8249 * The methods of `IteratorExt` [have been moved to the `Iterator`
8251 * Several traits that implement Rust's conventions for type
8252 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8253 [centralized in the `std::convert` module][con].
8254 * The `FromError` trait [was removed in favor of `From`][fe].
8255 * The basic sleep function [has moved to
8256 `std::thread::sleep_ms`][slp].
8257 * The `splitn` function now takes an `n` parameter that represents the
8258 number of items yielded by the returned iterator [instead of the
8259 number of 'splits'][spl].
8260 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8261 * [Derived implementations of `PartialOrd` now order enums according
8262 to their explicitly-assigned discriminants][po].
8263 * [Methods for searching strings are generic over `Pattern`s][pat],
8264 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8266 * [In method resolution, object methods are resolved before inherent
8268 * [`String::from_str` has been deprecated in favor of the `From` impl,
8269 `String::from`][sf].
8270 * [`io::Error` implements `Sync`][ios].
8271 * [The `words` method on `&str` has been replaced with
8272 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8274 * The new path and IO modules are complete and `#[stable]`. This
8275 was the major library focus for this cycle.
8276 * The path API was [revised][path-normalize] to normalize `.`,
8277 adjusting the tradeoffs in favor of the most common usage.
8278 * A large number of remaining APIs in `std` were also stabilized
8279 during this cycle; about 75% of the non-deprecated API surface
8281 * The new [string pattern API][string-pattern] landed, which makes
8282 the string slice API much more internally consistent and flexible.
8283 * A new set of [generic conversion traits][conversion] replaced
8284 many existing ad hoc traits.
8285 * Generic numeric traits were [completely removed][num-traits]. This
8286 was made possible thanks to inherent methods for primitive types,
8287 and the removal gives maximal flexibility for designing a numeric
8288 hierarchy in the future.
8289 * The `Fn` traits are now related via [inheritance][fn-inherit]
8290 and provide ergonomic [blanket implementations][fn-blanket].
8291 * The `Index` and `IndexMut` traits were changed to
8292 [take the index by value][index-value], enabling code like
8293 `hash_map["string"]` to work.
8294 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8295 `Copy` data is known to be `Clone` as well.
8300 * Many errors now have extended explanations that can be accessed with
8301 the `--explain` flag to `rustc`.
8302 * Many new examples have been added to the standard library
8304 * rustdoc has received a number of improvements focused on completion
8306 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8307 * Much headway was made on ecosystem-wide CI, making it possible
8308 to [compare builds for breakage][ci-compare].
8311 [crates.io]: http://crates.io
8312 [clo]: https://github.com/rust-lang/rust/pull/24034
8313 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8314 [con]: https://github.com/rust-lang/rust/pull/23875
8315 [cr]: https://github.com/rust-lang/rust/pull/23419
8316 [fe]: https://github.com/rust-lang/rust/pull/23879
8317 [ie]: https://github.com/rust-lang/rust/pull/23300
8318 [inv]: https://github.com/rust-lang/rust/pull/23938
8319 [ios]: https://github.com/rust-lang/rust/pull/24133
8320 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8321 [lt]: https://github.com/rust-lang/rust/pull/24057
8322 [meth]: https://github.com/rust-lang/rust/pull/24056
8323 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8324 [po]: https://github.com/rust-lang/rust/pull/24270
8325 [sf]: https://github.com/rust-lang/rust/pull/24517
8326 [slp]: https://github.com/rust-lang/rust/pull/23949
8327 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8328 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8329 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8330 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8331 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8332 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8333 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8334 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8335 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8336 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8337 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8338 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8339 [reflect]: https://github.com/rust-lang/rust/pull/23712
8340 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8341 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8342 [index-value]: https://github.com/rust-lang/rust/pull/23601
8343 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8344 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8345 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8346 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8347 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8348 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8351 Version 1.0.0-alpha.2 (2015-02-20)
8352 =====================================
8354 * ~1300 changes, numerous bugfixes
8358 * The various I/O modules were [overhauled][io-rfc] to reduce
8359 unnecessary abstractions and provide better interoperation with
8360 the underlying platform. The old `io` module remains temporarily
8362 * The standard library now [participates in feature gating][feat],
8363 so use of unstable libraries now requires a `#![feature(...)]`
8364 attribute. The impact of this change is [described on the
8365 forum][feat-forum]. [RFC][feat-rfc].
8369 * `for` loops [now operate on the `IntoIterator` trait][into],
8370 which eliminates the need to call `.iter()`, etc. to iterate
8371 over collections. There are some new subtleties to remember
8372 though regarding what sort of iterators various types yield, in
8373 particular that `for foo in bar { }` yields values from a move
8374 iterator, destroying the original collection. [RFC][into-rfc].
8375 * Objects now have [default lifetime bounds][obj], so you don't
8376 have to write `Box<Trait+'static>` when you don't care about
8377 storing references. [RFC][obj-rfc].
8378 * In types that implement `Drop`, [lifetimes must outlive the
8379 value][drop]. This will soon make it possible to safely
8380 implement `Drop` for types where `#[unsafe_destructor]` is now
8381 required. Read the [gorgeous RFC][drop-rfc] for details.
8382 * The fully qualified <T as Trait>::X syntax lets you set the Self
8383 type for a trait method or associated type. [RFC][ufcs-rfc].
8384 * References to types that implement `Deref<U>` now [automatically
8385 coerce to references][deref] to the dereferenced type `U`,
8386 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8387 should eliminate many unsightly uses of `&*`, as when converting
8388 from references to vectors into references to
8389 slices. [RFC][deref-rfc].
8390 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8391 `|:|`) is obsolete and closure kind is inferred from context.
8392 * [`Self` is a keyword][Self].
8396 * The `Show` and `String` formatting traits [have been
8397 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8398 their related purposes. Automatically getting a string
8399 conversion to use with `format!("{:?}", something_to_debug)` is
8400 now written `#[derive(Debug)]`.
8401 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8402 OsStr}`, provide strings in platform-specific encodings for easier
8403 interop with system APIs. [RFC][osstr-rfc].
8404 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8405 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8406 creating raw pointers.
8410 * Certain long error messages of the form 'expected foo found bar'
8411 are now [split neatly across multiple
8412 lines][multiline]. Examples in the PR.
8413 * On Unix Rust can be [uninstalled][un] by running
8414 `/usr/local/lib/rustlib/uninstall.sh`.
8415 * The `#[rustc_on_unimplemented]` attribute, requiring the
8416 'on_unimplemented' feature, lets rustc [display custom error
8417 messages when a trait is expected to be implemented for a type
8422 * Rust is tested against a [LALR grammar][lalr], which parses
8423 almost all the Rust files that rustc does.
8425 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8426 [close]: https://github.com/rust-lang/rust/pull/21843
8427 [deref]: https://github.com/rust-lang/rust/pull/21351
8428 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8429 [drop]: https://github.com/rust-lang/rust/pull/21972
8430 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8431 [feat]: https://github.com/rust-lang/rust/pull/21248
8432 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8433 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8434 [fmt]: https://github.com/rust-lang/rust/pull/21457
8435 [into]: https://github.com/rust-lang/rust/pull/20790
8436 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8437 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8438 [lalr]: https://github.com/rust-lang/rust/pull/21452
8439 [multiline]: https://github.com/rust-lang/rust/pull/19870
8440 [obj]: https://github.com/rust-lang/rust/pull/22230
8441 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8442 [onun]: https://github.com/rust-lang/rust/pull/20889
8443 [osstr]: https://github.com/rust-lang/rust/pull/21488
8444 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8445 [Self]: https://github.com/rust-lang/rust/pull/22158
8446 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8447 [un]: https://github.com/rust-lang/rust/pull/22256
8450 Version 1.0.0-alpha (2015-01-09)
8451 ==================================
8453 * ~2400 changes, numerous bugfixes
8457 * The language itself is considered feature complete for 1.0,
8458 though there will be many usability improvements and bugfixes
8459 before the final release.
8460 * Nearly 50% of the public API surface of the standard library has
8461 been declared 'stable'. Those interfaces are unlikely to change
8463 * The long-running debate over integer types has been
8464 [settled][ints]: Rust will ship with types named `isize` and
8465 `usize`, rather than `int` and `uint`, for pointer-sized
8466 integers. Guidelines will be rolled out during the alpha cycle.
8467 * Most crates that are not `std` have been moved out of the Rust
8468 distribution into the Cargo ecosystem so they can evolve
8469 separately and don't need to be stabilized as quickly, including
8470 'time', 'getopts', 'num', 'regex', and 'term'.
8471 * Documentation continues to be expanded with more API coverage, more
8472 examples, and more in-depth explanations. The guides have been
8473 consolidated into [The Rust Programming Language][trpl].
8474 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8475 * All official Rust binary installers now come with [Cargo], the
8476 Rust package manager.
8480 * Closures have been [completely redesigned][unboxed] to be
8481 implemented in terms of traits, can now be used as generic type
8482 bounds and thus monomorphized and inlined, or via an opaque
8483 pointer (boxed) as in the old system. The new system is often
8484 referred to as 'unboxed' closures.
8485 * Traits now support [associated types][assoc], allowing families
8486 of related types to be defined together and used generically in
8488 * Enum variants are [namespaced by their type names][enum].
8489 * [`where` clauses][where] provide a more versatile and attractive
8490 syntax for specifying generic bounds, though the previous syntax
8492 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8494 * Rust [no longer has a runtime][rt] of any description, and only
8495 supports OS threads, not green threads.
8496 * At long last, Rust has been overhauled for 'dynamically-sized
8497 types' ([DST]), which integrates 'fat pointers' (object types,
8498 arrays, and `str`) more deeply into the type system, making it
8500 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8501 `..j` that produce range types and which, when combined with the
8502 `Index` operator and multidispatch, leads to a convenient slice
8504 * The new range syntax revealed an ambiguity in the fixed-length
8505 array syntax, so now fixed length arrays [are written `[T;
8507 * The `Copy` trait is no longer implemented automatically. Unsafe
8508 pointers no longer implement `Sync` and `Send` so types
8509 containing them don't automatically either. `Sync` and `Send`
8510 are now 'unsafe traits' so one can "forcibly" implement them via
8511 `unsafe impl` if a type confirms to the requirements for them
8512 even though the internals do not (e.g. structs containing unsafe
8513 pointers like `Arc`). These changes are intended to prevent some
8514 footguns and are collectively known as [opt-in built-in
8515 traits][oibit] (though `Sync` and `Send` will soon become pure
8516 library types unknown to the compiler).
8517 * Operator traits now take their operands [by value][ops], and
8518 comparison traits can use multidispatch to compare one type
8519 against multiple other types, allowing e.g. `String` to be
8520 compared with `&str`.
8521 * `if let` and `while let` are no longer feature-gated.
8522 * Rust has adopted a more [uniform syntax for escaping unicode
8523 characters][unicode].
8524 * `macro_rules!` [has been declared stable][mac]. Though it is a
8525 flawed system it is sufficiently popular that it must be usable
8526 for 1.0. Effort has gone into [future-proofing][mac-future] it
8527 in ways that will allow other macro systems to be developed in
8528 parallel, and won't otherwise impact the evolution of the
8530 * The prelude has been [pared back significantly][prelude] such
8531 that it is the minimum necessary to support the most pervasive
8532 code patterns, and through [generalized where clauses][where]
8533 many of the prelude extension traits have been consolidated.
8534 * Rust's rudimentary reflection [has been removed][refl], as it
8535 incurred too much code generation for little benefit.
8536 * [Struct variants][structvars] are no longer feature-gated.
8537 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8538 known as 'higher-ranked trait bounds', this crucially allows
8539 unboxed closures to work.
8540 * Macros invocations surrounded by parens or square brackets and
8541 not terminated by a semicolon are [parsed as
8542 expressions][macros], which makes expressions like `vec![1i32,
8543 2, 3].len()` work as expected.
8544 * Trait objects now implement their traits automatically, and
8545 traits that can be coerced to objects now must be [object
8547 * Automatically deriving traits is now done with `#[derive(...)]`
8548 not `#[deriving(...)]` for [consistency with other naming
8549 conventions][derive].
8550 * Importing the containing module or enum at the same time as
8551 items or variants they contain is [now done with `self` instead
8552 of `mod`][self], as in use `foo::{self, bar}`
8553 * Glob imports are no longer feature-gated.
8554 * The `box` operator and `box` patterns have been feature-gated
8555 pending a redesign. For now unique boxes should be allocated
8556 like other containers, with `Box::new`.
8560 * A [series][coll1] of [efforts][coll2] to establish
8561 [conventions][coll3] for collections types has resulted in API
8562 improvements throughout the standard library.
8563 * New [APIs for error handling][err] provide ergonomic interop
8564 between error types, and [new conventions][err-conv] describe
8565 more clearly the recommended error handling strategies in Rust.
8566 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8567 it is easier to discuss failure in the context of error handling
8568 without making clarifications as to whether you are referring to
8569 the 'fail' macro or failure more generally.
8570 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8571 syscall when available.
8572 * The 'serialize' crate has been renamed 'rustc-serialize' and
8573 moved out of the distribution to Cargo. Although it is widely
8574 used now, it is expected to be superseded in the near future.
8575 * The `Show` formatter, typically implemented with
8576 `#[derive(Show)]` is [now requested with the `{:?}`
8577 specifier][show] and is intended for use by all types, for uses
8578 such as `println!` debugging. The new `String` formatter must be
8579 implemented by hand, uses the `{}` specifier, and is intended
8580 for full-fidelity conversions of things that can logically be
8581 represented as strings.
8585 * [Flexible target specification][flex] allows rustc's code
8586 generation to be configured to support otherwise-unsupported
8588 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8589 respective debuggers with Rust-appropriate pretty-printing.
8590 * The Windows installation of Rust is distributed with the
8591 MinGW components currently required to link binaries on that
8596 * Nullable enum optimizations have been extended to more types so
8597 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8598 space than the inner types themselves.
8599 * Work has begun on supporting AArch64.
8601 [Cargo]: https://crates.io
8602 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8603 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8604 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8605 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8606 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8607 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8608 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8609 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8610 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8611 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8612 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8613 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8614 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8615 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8616 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8617 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8618 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8619 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8620 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8621 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8622 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8623 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8624 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8625 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8626 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8627 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8628 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8629 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8630 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8631 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8632 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8633 [trpl]: https://doc.rust-lang.org/book/index.html
8634 [rbe]: http://rustbyexample.com/
8637 Version 0.12.0 (2014-10-09)
8638 =============================
8640 * ~1900 changes, numerous bugfixes
8644 * The introductory documentation (now called The Rust Guide) has
8645 been completely rewritten, as have a number of supplementary
8647 * Rust's package manager, Cargo, continues to improve and is
8648 sometimes considered to be quite awesome.
8649 * Many API's in `std` have been reviewed and updated for
8650 consistency with the in-development Rust coding
8651 guidelines. The standard library documentation tracks
8652 stabilization progress.
8653 * Minor libraries have been moved out-of-tree to the rust-lang org
8654 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8655 be installed with Cargo.
8656 * Lifetime elision allows lifetime annotations to be left off of
8657 function declarations in many common scenarios.
8658 * Rust now works on 64-bit Windows.
8661 * Indexing can be overloaded with the `Index` and `IndexMut`
8663 * The `if let` construct takes a branch only if the `let` pattern
8664 matches, currently behind the 'if_let' feature gate.
8665 * 'where clauses', a more flexible syntax for specifying trait
8666 bounds that is more aesthetic, have been added for traits and
8667 free functions. Where clauses will in the future make it
8668 possible to constrain associated types, which would be
8669 impossible with the existing syntax.
8670 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8671 the 'slicing_syntax' feature gate, and can be overloaded with
8672 the `Slice` or `SliceMut` traits.
8673 * The syntax for matching of sub-slices has been changed to use a
8674 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8675 consistency with other uses of `..` and to future-proof
8676 potential additional uses of the syntax.
8677 * The syntax for matching inclusive ranges in patterns has changed
8678 from `0..3` to `0...4` to be consistent with the exclusive range
8680 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8681 c]`) has been put behind the 'advanced_slice_patterns' feature
8682 gate and may be removed in the future.
8683 * Components of tuples and tuple structs can be extracted using
8684 the `value.0` syntax, currently behind the `tuple_indexing`
8686 * The `#[crate_id]` attribute is no longer supported; versioning
8687 is handled by the package manager.
8688 * Renaming crate imports are now written `extern crate foo as bar`
8689 instead of `extern crate bar = foo`.
8690 * Renaming use statements are now written `use foo as bar` instead
8692 * `let` and `match` bindings and argument names in macros are now
8694 * The new, more efficient, closure types ('unboxed closures') have
8695 been added under a feature gate, 'unboxed_closures'. These will
8696 soon replace the existing closure types, once higher-ranked
8697 trait lifetimes are added to the language.
8698 * `move` has been added as a keyword, for indicating closures
8699 that capture by value.
8700 * Mutation and assignment is no longer allowed in pattern guards.
8701 * Generic structs and enums can now have trait bounds.
8702 * The `Share` trait is now called `Sync` to free up the term
8703 'shared' to refer to 'shared reference' (the default reference
8705 * Dynamically-sized types have been mostly implemented,
8706 unifying the behavior of fat-pointer types with the rest of the
8708 * As part of dynamically-sized types, the `Sized` trait has been
8709 introduced, which qualifying types implement by default, and
8710 which type parameters expect by default. To specify that a type
8711 parameter does not need to be sized, write `<Sized? T>`. Most
8712 types are `Sized`, notable exceptions being unsized arrays
8713 (`[T]`) and trait types.
8714 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8715 * Lifetime bounds can now be applied to type parameters and object
8717 * The old, reference counted GC type, `Gc<T>` which was once
8718 denoted by the `@` sigil, has finally been removed. GC will be
8719 revisited in the future.
8722 * Library documentation has been improved for a number of modules.
8723 * Bit-vectors, collections::bitv has been modernized.
8724 * The url crate is deprecated in favor of
8725 http://github.com/servo/rust-url, which can be installed with
8727 * Most I/O stream types can be cloned and subsequently closed from
8729 * A `std::time::Duration` type has been added for use in I/O
8730 methods that rely on timers, as well as in the 'time' crate's
8731 `Timespec` arithmetic.
8732 * The runtime I/O abstraction layer that enabled the green thread
8733 scheduler to do non-thread-blocking I/O has been removed, along
8734 with the libuv-based implementation employed by the green thread
8735 scheduler. This will greatly simplify the future I/O work.
8736 * `collections::btree` has been rewritten to have a more
8737 idiomatic and efficient design.
8740 * rustdoc output now indicates the stability levels of API's.
8741 * The `--crate-name` flag can specify the name of the crate
8742 being compiled, like `#[crate_name]`.
8743 * The `-C metadata` specifies additional metadata to hash into
8744 symbol names, and `-C extra-filename` specifies additional
8745 information to put into the output filename, for use by the
8746 package manager for versioning.
8747 * debug info generation has continued to improve and should be
8748 more reliable under both gdb and lldb.
8749 * rustc has experimental support for compiling in parallel
8750 using the `-C codegen-units` flag.
8751 * rustc no longer encodes rpath information into binaries by
8755 * Stack usage has been optimized with LLVM lifetime annotations.
8756 * Official Rust binaries on Linux are more compatible with older
8757 kernels and distributions, built on CentOS 5.10.
8760 Version 0.11.0 (2014-07-02)
8761 ==========================
8763 * ~1700 changes, numerous bugfixes
8766 * ~[T] has been removed from the language. This type is superseded by
8768 * ~str has been removed from the language. This type is superseded by
8770 * ~T has been removed from the language. This type is superseded by the
8772 * @T has been removed from the language. This type is superseded by the
8773 standard library's std::gc::Gc<T> type.
8774 * Struct fields are now all private by default.
8775 * Vector indices and shift amounts are both required to be a `uint`
8776 instead of any integral type.
8777 * Byte character, byte string, and raw byte string literals are now all
8778 supported by prefixing the normal literal with a `b`.
8779 * Multiple ABIs are no longer allowed in an ABI string
8780 * The syntax for lifetimes on closures/procedures has been tweaked
8781 slightly: `<'a>|A, B|: 'b + K -> T`
8782 * Floating point modulus has been removed from the language; however it
8783 is still provided by a library implementation.
8784 * Private enum variants are now disallowed.
8785 * The `priv` keyword has been removed from the language.
8786 * A closure can no longer be invoked through a &-pointer.
8787 * The `use foo, bar, baz;` syntax has been removed from the language.
8788 * The transmute intrinsic no longer works on type parameters.
8789 * Statics now allow blocks/items in their definition.
8790 * Trait bounds are separated from objects with + instead of : now.
8791 * Objects can no longer be read while they are mutably borrowed.
8792 * The address of a static is now marked as insignificant unless the
8793 #[inline(never)] attribute is placed it.
8794 * The #[unsafe_destructor] attribute is now behind a feature gate.
8795 * Struct literals are no longer allowed in ambiguous positions such as
8796 if, while, match, and for..in.
8797 * Declaration of lang items and intrinsics are now feature-gated by
8799 * Integral literals no longer default to `int`, and floating point
8800 literals no longer default to `f64`. Literals must be suffixed with an
8801 appropriate type if inference cannot determine the type of the
8803 * The Box<T> type is no longer implicitly borrowed to &mut T.
8804 * Procedures are now required to not capture borrowed references.
8807 * The standard library is now a "facade" over a number of underlying
8808 libraries. This means that development on the standard library should
8809 be speedier due to smaller crates, as well as a clearer line between
8811 * A new library, libcore, lives under the standard library's facade
8812 which is Rust's "0-assumption" library, suitable for embedded and
8813 kernel development for example.
8814 * A regex crate has been added to the standard distribution. This crate
8815 includes statically compiled regular expressions.
8816 * The unwrap/unwrap_err methods on Result require a Show bound for
8817 better error messages.
8818 * The return types of the std::comm primitives have been centralized
8819 around the Result type.
8820 * A number of I/O primitives have gained the ability to time out their
8822 * A number of I/O primitives have gained the ability to close their
8823 reading/writing halves to cancel pending operations.
8824 * Reverse iterator methods have been removed in favor of `rev()` on
8825 their forward-iteration counterparts.
8826 * A bitflags! macro has been added to enable easy interop with C and
8827 management of bit flags.
8828 * A debug_assert! macro is now provided which is disabled when
8829 `--cfg ndebug` is passed to the compiler.
8830 * A graphviz crate has been added for creating .dot files.
8831 * The std::cast module has been migrated into std::mem.
8832 * The std::local_data api has been migrated from freestanding functions
8833 to being based on methods.
8834 * The Pod trait has been renamed to Copy.
8835 * jemalloc has been added as the default allocator for types.
8836 * The API for allocating memory has been changed to use proper alignment
8837 and sized deallocation
8838 * Connecting a TcpStream or binding a TcpListener is now based on a
8839 string address and a u16 port. This allows connecting to a hostname as
8841 * The Reader trait now contains a core method, read_at_least(), which
8842 correctly handles many repeated 0-length reads.
8843 * The process-spawning API is now centered around a builder-style
8845 * The :? printing qualifier has been moved from the standard library to
8846 an external libdebug crate.
8847 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8848 have been renamed to Eq/Ord.
8849 * The select/plural methods have been removed from format!. The escapes
8850 for { and } have also changed from \{ and \} to {{ and }},
8852 * The TaskBuilder API has been re-worked to be a true builder, and
8853 extension traits for spawning native/green tasks have been added.
8856 * All breaking changes to the language or libraries now have their
8857 commit message annotated with `[breaking-change]` to allow for easy
8858 discovery of breaking changes.
8859 * The compiler will now try to suggest how to annotate lifetimes if a
8860 lifetime-related error occurs.
8861 * Debug info continues to be improved greatly with general bug fixes and
8862 better support for situations like link time optimization (LTO).
8863 * Usage of syntax extensions when cross-compiling has been fixed.
8864 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8865 -fdata-sections and --gc-sections has been enabled by default
8866 * The compiler is now stricter about where it will load module files
8867 from when a module is declared via `mod foo;`.
8868 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8869 Syntax extensions are now discovered via a "plugin registrar" type
8870 which will be extended in the future to other various plugins.
8871 * Lints have been restructured to allow for dynamically loadable lints.
8872 * A number of rustdoc improvements:
8873 * The HTML output has been visually redesigned.
8874 * Markdown is now powered by hoedown instead of sundown.
8875 * Searching heuristics have been greatly improved.
8876 * The search index has been reduced in size by a great amount.
8877 * Cross-crate documentation via `pub use` has been greatly improved.
8878 * Primitive types are now hyperlinked and documented.
8879 * Documentation has been moved from static.rust-lang.org/doc to
8881 * A new sandbox, play.rust-lang.org, is available for running and
8882 sharing rust code examples on-line.
8883 * Unused attributes are now more robustly warned about.
8884 * The dead_code lint now warns about unused struct fields.
8885 * Cross-compiling to iOS is now supported.
8886 * Cross-compiling to mipsel is now supported.
8887 * Stability attributes are now inherited by default and no longer apply
8888 to intra-crate usage, only inter-crate usage.
8889 * Error message related to non-exhaustive match expressions have been
8893 Version 0.10 (2014-04-03)
8894 =========================
8896 * ~1500 changes, numerous bugfixes
8899 * A new RFC process is now in place for modifying the language.
8900 * Patterns with `@`-pointers have been removed from the language.
8901 * Patterns with unique vectors (`~[T]`) have been removed from the
8903 * Patterns with unique strings (`~str`) have been removed from the
8905 * `@str` has been removed from the language.
8906 * `@[T]` has been removed from the language.
8907 * `@self` has been removed from the language.
8908 * `@Trait` has been removed from the language.
8909 * Headers on `~` allocations which contain `@` boxes inside the type for
8910 reference counting have been removed.
8911 * The semantics around the lifetimes of temporary expressions have changed,
8912 see #3511 and #11585 for more information.
8913 * Cross-crate syntax extensions are now possible, but feature gated. See
8914 #11151 for more information. This includes both `macro_rules!` macros as
8915 well as syntax extensions such as `format!`.
8916 * New lint modes have been added, and older ones have been turned on to be
8918 * Unnecessary parentheses
8921 * Uppercase variables
8922 * Publicly visible private types
8923 * `#[deriving]` with raw pointers
8924 * Unsafe functions can no longer be coerced to closures.
8925 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8926 * The `#[simd]` attribute is now behind a feature gate.
8927 * Visibility is no longer allowed on `extern crate` statements, and
8928 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8929 * Trailing commas are now allowed in argument lists and tuple patterns.
8930 * The `do` keyword has been removed, it is now a reserved keyword.
8931 * Default type parameters have been implemented, but are feature gated.
8932 * Borrowed variables through captures in closures are now considered soundly.
8933 * `extern mod` is now `extern crate`
8934 * The `Freeze` trait has been removed.
8935 * The `Share` trait has been added for types that can be shared among
8937 * Labels in macros are now hygienic.
8938 * Expression/statement macro invocations can be delimited with `{}` now.
8939 * Treatment of types allowed in `static mut` locations has been tweaked.
8940 * The `*` and `.` operators are now overloadable through the `Deref` and
8942 * `~Trait` and `proc` no longer have `Send` bounds by default.
8943 * Partial type hints are now supported with the `_` type marker.
8944 * An `Unsafe` type was introduced for interior mutability. It is now
8945 considered undefined to transmute from `&T` to `&mut T` without using the
8947 * The #[linkage] attribute was implemented for extern statics/functions.
8948 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8949 * `Pod` was renamed to `Copy`.
8952 * The `libextra` library has been removed. It has now been decomposed into
8953 component libraries with smaller and more focused nuggets of
8954 functionality. The full list of libraries can be found on the
8955 documentation index page.
8956 * std: `std::condition` has been removed. All I/O errors are now propagated
8957 through the `Result` type. In order to assist with error handling, a
8958 `try!` macro for unwrapping errors with an early return and a lint for
8959 unused results has been added. See #12039 for more information.
8960 * std: The `vec` module has been renamed to `slice`.
8961 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8962 This will become the only growable vector in the future.
8963 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8964 are now found at `std::io::BufferedReader` instead of
8965 `std::io::buffered::BufferedReader`.
8966 * std: `print` and `println` are no longer in the prelude, the `print!` and
8967 `println!` macros are intended to be used instead.
8968 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8969 attempts to statically prevent cycles.
8970 * std: The standard distribution is adopting the policy of pushing failure
8971 to the user rather than failing in libraries. Many functions (such as
8972 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8973 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8974 deriving mode: `#[deriving(Show)]`.
8975 * std: `ToStr` is now implemented for all types implementing `Show`.
8976 * std: The formatting trait methods now take `&self` instead of `&T`
8977 * std: The `invert()` method on iterators has been renamed to `rev()`
8978 * std: `std::num` has seen a reduction in the genericity of its traits,
8979 consolidating functionality into a few core traits.
8980 * std: Backtraces are now printed on task failure if the environment
8981 variable `RUST_BACKTRACE` is present.
8982 * std: Naming conventions for iterators have been standardized. More details
8983 can be found on the wiki's style guide.
8984 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8985 still implement the function.
8986 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8987 * std: `assert_approx_eq!` has been removed
8988 * std: The `e` and `E` formatting specifiers for floats have been added to
8989 print them in exponential notation.
8990 * std: The `Times` trait has been removed
8991 * std: Indications of variance and opting out of builtin bounds is done
8992 through marker types in `std::kinds::marker` now
8993 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8994 `#[deriving(Hash)]` is now possible.
8995 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8996 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8997 * std: `Chan::new` is now `channel()`.
8998 * std: A new synchronous channel type has been implemented.
8999 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9000 * std: `hashmap` and `trie` have been moved to `libcollections`
9001 * std: `run` has been rolled into `io::process`
9002 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9003 * std: The equality and comparison traits have seen some reorganization.
9004 * std: `rand` has moved to `librand`.
9005 * std: `to_{lower,upper}case` has been implemented for `char`.
9006 * std: Logging has been moved to `liblog`.
9007 * collections: `HashMap` has been rewritten for higher performance and less
9009 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9010 it can be booted manually. The runtime guide has more information and
9012 * native: All I/O functionality except signals has been implemented.
9013 * green: Task spawning with `libgreen` has been optimized with stack caching
9014 and various trimming of code.
9015 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9016 * sync: The `extra::sync` module has been updated to modern rust (and moved
9017 to the `sync` library), tweaking and improving various interfaces while
9018 dropping redundant functionality.
9019 * sync: A new `Barrier` type has been added to the `sync` library.
9020 * sync: An efficient mutex for native and green tasks has been implemented.
9021 * serialize: The `base64` module has seen some improvement. It treats
9022 newlines better, has non-string error values, and has seen general
9024 * fourcc: A `fourcc!` macro was introduced
9025 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9026 hexadecimal literal.
9029 * `rustpkg` has been deprecated and removed from the main repository. Its
9030 replacement, `cargo`, is under development.
9031 * Nightly builds of rust are now available
9032 * The memory usage of rustc has been improved many times throughout this
9034 * The build process supports disabling rpath support for the rustc binary
9036 * Code generation has improved in some cases, giving more information to the
9037 LLVM optimization passes to enable more extensive optimizations.
9038 * Debuginfo compatibility with lldb on OSX has been restored.
9039 * The master branch is now gated on an android bot, making building for
9040 android much more reliable.
9041 * Output flags have been centralized into one `--emit` flag.
9042 * Crate type flags have been centralized into one `--crate-type` flag.
9043 * Codegen flags have been consolidated behind a `-C` flag.
9044 * Linking against outdated crates now has improved error messages.
9045 * Error messages with lifetimes will often suggest how to annotate the
9046 function to fix the error.
9047 * Many more types are documented in the standard library, and new guides
9049 * Many `rustdoc` improvements:
9050 * code blocks are syntax highlighted.
9051 * render standalone markdown files.
9052 * the --test flag tests all code blocks by default.
9053 * exported macros are displayed.
9054 * re-exported types have their documentation inlined at the location of the
9056 * search works across crates that have been rendered to the same output
9060 Version 0.9 (2014-01-09)
9061 ==========================
9063 * ~1800 changes, numerous bugfixes
9066 * The `float` type has been removed. Use `f32` or `f64` instead.
9067 * A new facility for enabling experimental features (feature gating) has
9068 been added, using the crate-level `#[feature(foo)]` attribute.
9069 * Managed boxes (@) are now behind a feature gate
9070 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9071 standard library's `Gc` or `Rc` types instead.
9072 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9073 * Jumping back to the top of a loop is now done with `continue` instead of
9075 * Strings can no longer be mutated through index assignment.
9076 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9077 hash delimiters, as in `r###"foo"###`.
9078 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9080 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9081 * `@fn`s have been removed.
9082 * `do` only works with procs in order to make it obvious what the cost
9084 * Single-element tuple-like structs can no longer be dereferenced to
9085 obtain the inner value. A more comprehensive solution for overloading
9086 the dereference operator will be provided in the future.
9087 * The `#[link(...)]` attribute has been replaced with
9088 `#[crate_id = "name#vers"]`.
9089 * Empty `impl`s must be terminated with empty braces and may not be
9090 terminated with a semicolon.
9091 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9092 no longer has any special meaning.
9093 * The old `fmt!` string formatting macro has been removed.
9094 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9095 `print!` and `println!`.
9096 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9097 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9098 `extern mod foo = "bar"` instead.
9099 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9100 * Macros can have attributes.
9101 * Macros can expand to items with attributes.
9102 * Macros can expand to multiple items.
9103 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9104 * Comments may be nested.
9105 * Values automatically coerce to trait objects they implement, without
9107 * Enum discriminants are no longer an entire word but as small as needed to
9108 contain all the variants. The `repr` attribute can be used to override
9109 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9110 `#[repr(C)]` to match C enums.
9111 * Non-string literals are not allowed in attributes (they never worked).
9112 * The FFI now supports variadic functions.
9113 * Octal numeric literals, as in `0o7777`.
9114 * The `concat!` syntax extension performs compile-time string concatenation.
9115 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9116 removed as Rust no longer uses segmented stacks.
9117 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9118 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9119 not `*`; ignoring remaining fields of a struct is also done with `..`,
9120 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9121 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9122 * `rustc` supports the "system" calling convention, which defaults to the
9123 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9125 * The `type_overflow` lint (default: warn) checks literals for overflow.
9126 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9127 * The `attribute_usage` lint (default: warn) warns about unknown
9129 * The `unknown_features` lint (default: warn) warns about unknown
9131 * The `dead_code` lint (default: warn) checks for dead code.
9132 * Rust libraries can be linked statically to one another
9133 * `#[link_args]` is behind the `link_args` feature gate.
9134 * Native libraries are now linked with `#[link(name = "foo")]`
9135 * Native libraries can be statically linked to a rust crate
9136 (`#[link(name = "foo", kind = "static")]`).
9137 * Native OS X frameworks are now officially supported
9138 (`#[link(name = "foo", kind = "framework")]`).
9139 * The `#[thread_local]` attribute creates thread-local (not task-local)
9140 variables. Currently behind the `thread_local` feature gate.
9141 * The `return` keyword may be used in closures.
9142 * Types that can be copied via a memcpy implement the `Pod` kind.
9143 * The `cfg` attribute can now be used on struct fields and enum variants.
9146 * std: The `option` and `result` API's have been overhauled to make them
9147 simpler, more consistent, and more composable.
9148 * std: The entire `std::io` module has been replaced with one that is
9149 more comprehensive and that properly interfaces with the underlying
9150 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9152 * std: `io::util` contains a number of useful implementations of
9153 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9154 `ZeroReader`, `TeeReader`.
9155 * std: The reference counted pointer type `extra::rc` moved into std.
9156 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9157 just a wrapper around it).
9158 * std: The `Either` type has been removed.
9159 * std: `fmt::Default` can be implemented for any type to provide default
9160 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9161 * std: The `rand` API continues to be tweaked.
9162 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9163 on failure in gdb, is now named `rust_fail`.
9164 * std: The `each_key` and `each_value` methods on `HashMap` have been
9165 replaced by the `keys` and `values` iterators.
9166 * std: Functions dealing with type size and alignment have moved from the
9167 `sys` module to the `mem` module.
9168 * std: The `path` module was written and API changed.
9169 * std: `str::from_utf8` has been changed to cast instead of allocate.
9170 * std: `starts_with` and `ends_with` methods added to vectors via the
9171 `ImmutableEqVector` trait, which is in the prelude.
9172 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9173 if the index is out of bounds.
9174 * std: Task failure no longer propagates between tasks, as the model was
9175 complex, expensive, and incompatible with thread-based tasks.
9176 * std: The `Any` type can be used for dynamic typing.
9177 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9179 * std: Methods that produce iterators generally do not have an `_iter`
9181 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9182 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9183 * std: `util::ignore` renamed to `prelude::drop`.
9184 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9186 * std: `vec::raw` has seen a lot of cleanup and API changes.
9187 * std: The standard library no longer includes any C++ code, and very
9188 minimal C, eliminating the dependency on libstdc++.
9189 * std: Runtime scheduling and I/O functionality has been factored out into
9190 extensible interfaces and is now implemented by two different crates:
9191 libnative, for native threading and I/O; and libgreen, for green threading
9192 and I/O. This paves the way for using the standard library in more limited
9193 embedded environments.
9194 * std: The `comm` module has been rewritten to be much faster, have a
9195 simpler, more consistent API, and to work for both native and green
9197 * std: All libuv dependencies have been moved into the rustuv crate.
9198 * native: New implementations of runtime scheduling on top of OS threads.
9199 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9201 * green: The green thread scheduler and message passing types are almost
9203 * extra: The `flatpipes` module had bitrotted and was removed.
9204 * extra: All crypto functions have been removed and Rust now has a policy of
9205 not reimplementing crypto in the standard library. In the future crypto
9206 will be provided by external crates with bindings to established libraries.
9207 * extra: `c_vec` has been modernized.
9208 * extra: The `sort` module has been removed. Use the `sort` method on
9212 * The `rust` and `rusti` commands have been removed, due to lack of
9214 * `rustdoc` was completely rewritten.
9215 * `rustdoc` can test code examples in documentation.
9216 * `rustpkg` can test packages with the argument, 'test'.
9217 * `rustpkg` supports arbitrary dependencies, including C libraries.
9218 * `rustc`'s support for generating debug info is improved again.
9219 * `rustc` has better error reporting for unbalanced delimiters.
9220 * `rustc`'s JIT support was removed due to bitrot.
9221 * Executables and static libraries can be built with LTO (-Z lto)
9222 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9226 Version 0.8 (2013-09-26)
9227 ============================
9229 * ~2200 changes, numerous bugfixes
9232 * The `for` loop syntax has changed to work with the `Iterator` trait.
9233 * At long last, unwinding works on Windows.
9234 * Default methods are ready for use.
9235 * Many trait inheritance bugs fixed.
9236 * Owned and borrowed trait objects work more reliably.
9237 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9238 * rustc can omit emission of code for the `debug!` macro if it is passed
9240 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9241 for foo.rs, then foo/mod.rs, and will generate an error when both are
9243 * Strings no longer contain trailing nulls. The new `std::c_str` module
9244 provides new mechanisms for converting to C strings.
9245 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9246 * The FFI has been overhauled such that foreign functions are called directly,
9247 instead of through a stack-switching wrapper.
9248 * Calling a foreign function must be done through a Rust function with the
9249 `#[fixed_stack_segment]` attribute.
9250 * The `externfn!` macro can be used to declare both a foreign function and
9251 a `#[fixed_stack_segment]` wrapper at once.
9252 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9253 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9254 * `priv` is disallowed everywhere except for struct fields and enum variants.
9255 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9256 * `ref` bindings in irrefutable patterns work correctly now.
9257 * `char` is now prevented from containing invalid code points.
9258 * Casting to `bool` is no longer allowed.
9259 * `\0` is now accepted as an escape in chars and strings.
9260 * `yield` is a reserved keyword.
9261 * `typeof` is a reserved keyword.
9262 * Crates may be imported by URL with `extern mod foo = "url";`.
9263 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9264 * Static vectors can be initialized with repeating elements,
9265 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9266 * Static structs can be initialized with functional record update,
9267 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9268 * `cfg!` can be used to conditionally execute code based on the crate
9269 configuration, similarly to `#[cfg(...)]`.
9270 * The `unnecessary_qualification` lint detects unneeded module
9271 prefixes (default: allow).
9272 * Arithmetic operations have been implemented on the SIMD types in
9273 `std::unstable::simd`.
9274 * Exchange allocation headers were removed, reducing memory usage.
9275 * `format!` implements a completely new, extensible, and higher-performance
9276 string formatting system. It will replace `fmt!`.
9277 * `print!` and `println!` write formatted strings (using the `format!`
9278 extension) to stdout.
9279 * `write!` and `writeln!` write formatted strings (using the `format!`
9280 extension) to the new Writers in `std::rt::io`.
9281 * The library section in which a function or static is placed may
9282 be specified with `#[link_section = "..."]`.
9283 * The `proto!` syntax extension for defining bounded message protocols
9285 * `macro_rules!` is hygienic for `let` declarations.
9286 * The `#[export_name]` attribute specifies the name of a symbol.
9287 * `unreachable!` can be used to indicate unreachable code, and fails
9291 * std: Transitioned to the new runtime, written in Rust.
9292 * std: Added an experimental I/O library, `rt::io`, based on the new
9294 * std: A new generic `range` function was added to the prelude, replacing
9295 `uint::range` and friends.
9296 * std: `range_rev` no longer exists. Since range is an iterator it can be
9297 reversed with `range(lo, hi).invert()`.
9298 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9299 renamed to `unwrap_or`.
9300 * std: The `iterator` module was renamed to `iter`.
9301 * std: Integral types now support the `checked_add`, `checked_sub`, and
9302 `checked_mul` operations for detecting overflow.
9303 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9305 * std: Methods are standardizing on conventions for casting methods:
9306 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9308 * std: The `CString` type in `c_str` provides new ways to convert to and
9310 * std: `DoubleEndedIterator` can yield elements in two directions.
9311 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9313 * std: `str::from_bytes` renamed to `str::from_utf8`.
9314 * std: `pop_opt` and `shift_opt` methods added to vectors.
9315 * std: The task-local data interface no longer uses @, and keys are
9316 no longer function pointers.
9317 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9318 * std: Added `SharedPort` to `comm`.
9319 * std: `Eq` has a default method for `ne`; only `eq` is required
9321 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9322 is required in implementations.
9323 * std: `is_utf8` performance is improved, impacting many string functions.
9324 * std: `os::MemoryMap` provides cross-platform mmap.
9325 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9326 are not 'in-bounds' are considered undefined.
9327 * std: Many freestanding functions in `vec` removed in favor of methods.
9328 * std: Many freestanding functions on scalar types removed in favor of
9330 * std: Many options to task builders were removed since they don't make
9331 sense in the new scheduler design.
9332 * std: More containers implement `FromIterator` so can be created by the
9334 * std: More complete atomic types in `unstable::atomics`.
9335 * std: `comm::PortSet` removed.
9336 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9337 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9338 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9339 default implementations.
9340 * std: Various `from_str` functions were removed in favor of a generic
9341 `from_str` which is available in the prelude.
9342 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9343 * extra: `dlist`, the doubly-linked list was modernized.
9344 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9345 * extra: Added `glob` module, replacing `std::os::glob`.
9346 * extra: `rope` was removed.
9347 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9348 * extra: `net`, and `timer` were removed. The experimental replacements
9349 are `std::rt::io::net` and `std::rt::io::timer`.
9350 * extra: Iterators implemented for `SmallIntMap`.
9351 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9352 * extra: `SmallIntSet` removed. Use `BitvSet`.
9353 * extra: Performance of JSON parsing greatly improved.
9354 * extra: `semver` updated to SemVer 2.0.0.
9355 * extra: `term` handles more terminals correctly.
9356 * extra: `dbg` module removed.
9357 * extra: `par` module removed.
9358 * extra: `future` was cleaned up, with some method renames.
9359 * extra: Most free functions in `getopts` were converted to methods.
9362 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9363 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9364 similarly to gcc's `--march` flag.
9365 * rustc's performance compiling small crates is much better.
9366 * rustpkg has received many improvements.
9367 * rustpkg supports git tags as package IDs.
9368 * rustpkg builds into target-specific directories so it can be used for
9370 * The number of concurrent test tasks is controlled by the environment
9371 variable RUST_TEST_TASKS.
9372 * The test harness can now report metrics for benchmarks.
9373 * All tools have man pages.
9374 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9375 * The runtime uses jemalloc for allocations.
9376 * Segmented stacks are temporarily disabled as part of the transition to
9377 the new runtime. Stack overflows are possible!
9378 * A new documentation backend, rustdoc_ng, is available for use. It is
9379 still invoked through the normal `rustdoc` command.
9382 Version 0.7 (2013-07-03)
9383 =======================
9385 * ~2000 changes, numerous bugfixes
9388 * `impl`s no longer accept a visibility qualifier. Put them on methods
9390 * The borrow checker has been rewritten with flow-sensitivity, fixing
9391 many bugs and inconveniences.
9392 * The `self` parameter no longer implicitly means `&'self self`,
9393 and can be explicitly marked with a lifetime.
9394 * Overloadable compound operators (`+=`, etc.) have been temporarily
9395 removed due to bugs.
9396 * The `for` loop protocol now requires `for`-iterators to return `bool`
9397 so they compose better.
9398 * The `Durable` trait is replaced with the `'static` bounds.
9399 * Trait default methods work more often.
9400 * Structs with the `#[packed]` attribute have byte alignment and
9401 no padding between fields.
9402 * Type parameters bound by `Copy` must now be copied explicitly with
9404 * It is now illegal to move out of a dereferenced unsafe pointer.
9405 * `Option<~T>` is now represented as a nullable pointer.
9406 * `@mut` does dynamic borrow checks correctly.
9407 * The `main` function is only detected at the topmost level of the crate.
9408 The `#[main]` attribute is still valid anywhere.
9409 * Struct fields may no longer be mutable. Use inherited mutability.
9410 * The `#[no_send]` attribute makes a type that would otherwise be
9412 * The `#[no_freeze]` attribute makes a type that would otherwise be
9414 * Unbounded recursion will abort the process after reaching the limit
9415 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9416 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9417 are never implicitly copyable.
9418 * `#[static_assert]` makes compile-time assertions about static bools.
9419 * At long last, 'argument modes' no longer exist.
9420 * The rarely used `use mod` statement no longer exists.
9423 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9425 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9426 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9428 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9429 and unsuffixed integer literals.
9432 * The `core` crate was renamed to `std`.
9433 * The `std` crate was renamed to `extra`.
9434 * More and improved documentation.
9435 * std: `iterator` module for external iterator objects.
9436 * Many old-style (internal, higher-order function) iterators replaced by
9437 implementations of `Iterator`.
9438 * std: Many old internal vector and string iterators,
9439 incl. `any`, `all`. removed.
9440 * std: The `finalize` method of `Drop` renamed to `drop`.
9441 * std: The `drop` method now takes `&mut self` instead of `&self`.
9442 * std: The prelude no longer re-exports any modules, only types and traits.
9443 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9444 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9445 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9446 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9447 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9448 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9449 * std: Many types implement `Clone`.
9450 * std: `path` type renamed to `Path`.
9451 * std: `mut` module and `Mut` type removed.
9452 * std: Many standalone functions removed in favor of methods and iterators
9453 in `vec`, `str`. In the future methods will also work as functions.
9454 * std: `reinterpret_cast` removed. Use `transmute`.
9455 * std: ascii string handling in `std::ascii`.
9456 * std: `Rand` is implemented for ~/@.
9457 * std: `run` module for spawning processes overhauled.
9458 * std: Various atomic types added to `unstable::atomic`.
9459 * std: Various types implement `Zero`.
9460 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9461 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9462 * std: Added `os::mkdir_recursive`.
9463 * std: Added `os::glob` function performs filesystems globs.
9464 * std: `FuzzyEq` renamed to `ApproxEq`.
9465 * std: `Map` now defines `pop` and `swap` methods.
9466 * std: `Cell` constructors converted to static methods.
9467 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9468 * extra: `flate` module moved from `std` to `extra`.
9469 * extra: `fileinput` module for iterating over a series of files.
9470 * extra: `Complex` number type and `complex` module.
9471 * extra: `Rational` number type and `rational` module.
9472 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9473 * extra: `term` uses terminfo now, is more correct.
9474 * extra: `arc` functions converted to methods.
9475 * extra: Implementation of fixed output size variations of SHA-2.
9478 * `unused_variables` lint mode for unused variables (default: warn).
9479 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9481 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9483 * `dead_assignment` lint mode for unread variables (default: warn).
9484 * `unnecessary_allocation` lint mode detects some heap allocations that are
9485 immediately borrowed so could be written without allocating (default: warn).
9486 * `missing_doc` lint mode (default: allow).
9487 * `unreachable_code` lint mode (default: warn).
9488 * The `rusti` command has been rewritten and a number of bugs addressed.
9489 * rustc outputs in color on more terminals.
9490 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9491 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9492 * Compiling with `-g` will make the binary record information about
9493 dynamic borrowcheck failures for debugging.
9494 * rustdoc has a nicer stylesheet.
9495 * Various improvements to rustdoc.
9496 * Improvements to rustpkg (see the detailed release notes).
9499 Version 0.6 (2013-04-03)
9500 ========================
9502 * ~2100 changes, numerous bugfixes
9505 * The self type parameter in traits is now spelled `Self`
9506 * The `self` parameter in trait and impl methods must now be explicitly
9507 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9508 * Static methods no longer require the `static` keyword and instead
9509 are distinguished by the lack of a `self` parameter
9510 * Replaced the `Durable` trait with the `'static` lifetime
9511 * The old closure type syntax with the trailing sigil has been
9512 removed in favor of the more consistent leading sigil
9513 * `super` is a keyword, and may be prefixed to paths
9514 * Trait bounds are separated with `+` instead of whitespace
9515 * Traits are implemented with `impl Trait for Type`
9516 instead of `impl Type: Trait`
9517 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9518 * The `export` keyword has finally been removed
9519 * The `move` keyword has been removed (see "Semantic changes")
9520 * The interior mutability qualifier on vectors, `[mut T]`, has been
9521 removed. Use `&mut [T]`, etc.
9522 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9523 * `fail` is no longer a keyword. Use `fail!()`
9524 * `assert` is no longer a keyword. Use `assert!()`
9525 * `log` is no longer a keyword. use `debug!`, etc.
9526 * 1-tuples may be represented as `(T,)`
9527 * Struct fields may no longer be `mut`. Use inherited mutability,
9528 `@mut T`, `core::mut` or `core::cell`
9529 * `extern mod { ... }` is no longer valid syntax for foreign
9530 function modules. Use extern blocks: `extern { ... }`
9531 * Newtype enums removed. Use tuple-structs.
9532 * Trait implementations no longer support visibility modifiers
9533 * Pattern matching over vectors improved and expanded
9534 * `const` renamed to `static` to correspond to lifetime name,
9535 and make room for future `static mut` unsafe mutable globals.
9536 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9537 * `Clone` implementations can be automatically generated with
9538 `#[deriving(Clone)]`
9539 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9540 instead of `foo as Bar`.
9541 * Fixed length vector types are now written as `[int, .. 3]`
9542 instead of `[int * 3]`.
9543 * Fixed length vector types can express the length as a constant
9544 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9547 * Types with owned pointers or custom destructors move by default,
9548 eliminating the `move` keyword
9549 * All foreign functions are considered unsafe
9550 * &mut is now unaliasable
9551 * Writes to borrowed @mut pointers are prevented dynamically
9553 * The name of the main function can be customized using #[main]
9554 * The default type of an inferred closure is &fn instead of @fn
9555 * `use` statements may no longer be "chained" - they cannot import
9556 identifiers imported by previous `use` statements
9557 * `use` statements are crate relative, importing from the "top"
9558 of the crate by default. Paths may be prefixed with `super::`
9559 or `self::` to change the search behavior.
9560 * Method visibility is inherited from the implementation declaration
9561 * Structural records have been removed
9562 * Many more types can be used in static items, including enums
9563 'static-lifetime pointers and vectors
9564 * Pattern matching over vectors improved and expanded
9565 * Typechecking of closure types has been overhauled to
9566 improve inference and eliminate unsoundness
9567 * Macros leave scope at the end of modules, unless that module is
9568 tagged with #[macro_escape]
9571 * Added big integers to `std::bigint`
9572 * Removed `core::oldcomm` module
9573 * Added pipe-based `core::comm` module
9574 * Numeric traits have been reorganized under `core::num`
9575 * `vec::slice` finally returns a slice
9576 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9577 * Containers reorganized around traits in `core::container`
9578 * `core::dvec` removed, `~[T]` is a drop-in replacement
9579 * `core::send_map` renamed to `core::hashmap`
9580 * `std::map` removed; replaced with `core::hashmap`
9581 * `std::treemap` reimplemented as an owned balanced tree
9582 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9583 * `core::trie` added as a fast ordered map for integer keys
9584 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9585 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9586 overload the comparison operators, whereas `TotalOrd` is used
9587 by certain container types
9590 * Replaced the 'cargo' package manager with 'rustpkg'
9591 * Added all-purpose 'rust' tool
9592 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9593 * rustc now *attempts* to offer spelling suggestions
9594 * Improved support for ARM and Android
9595 * Preliminary MIPS backend
9596 * Improved foreign function ABI implementation for x86, x86_64
9597 * Various memory usage improvements
9598 * Rust code may be embedded in foreign code under limited circumstances
9599 * Inline assembler supported by new asm!() syntax extension.
9602 Version 0.5 (2012-12-21)
9603 ===========================
9605 * ~900 changes, numerous bugfixes
9608 * Removed `<-` move operator
9609 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9610 * Removed old fixed length vector syntax - `[T]/N`
9611 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9612 * Macros may now expand to items and statements
9613 * `a.b()` is always parsed as a method call, never as a field projection
9614 * `Eq` and `IterBytes` implementations can be automatically generated
9615 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9616 * Removed the special crate language for `.rc` files
9617 * Function arguments may consist of any irrefutable pattern
9620 * `&` and `~` pointers may point to objects
9621 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9622 * Enum variants may be structs
9623 * Destructors can be added to all nominal types with the Drop trait
9624 * Structs and nullary enum variants may be constants
9625 * Values that cannot be implicitly copied are now automatically moved
9626 without writing `move` explicitly
9627 * `&T` may now be coerced to `*T`
9628 * Coercions happen in `let` statements as well as function calls
9629 * `use` statements now take crate-relative paths
9630 * The module and type namespaces have been merged so that static
9631 method names can be resolved under the trait in which they are
9634 * Improved support for language features
9635 * Trait inheritance works in many scenarios
9636 * More support for explicit self arguments in methods - `self`, `&self`
9637 `@self`, and `~self` all generally work as expected
9638 * Static methods work in more situations
9639 * Experimental: Traits may declare default methods for the implementations
9643 * New condition handling system in `core::condition`
9644 * Timsort added to `std::sort`
9645 * New priority queue, `std::priority_queue`
9646 * Pipes for serializable types, `std::flatpipes'
9647 * Serialization overhauled to be trait-based
9648 * Expanded `getopts` definitions
9649 * Moved futures to `std`
9650 * More functions are pure now
9651 * `core::comm` renamed to `oldcomm`. Still deprecated
9652 * `rustdoc` and `cargo` are libraries now
9655 * Added a preliminary REPL, `rusti`
9656 * License changed from MIT to dual MIT/APL2
9659 Version 0.4 (2012-10-15)
9660 ==========================
9662 * ~2000 changes, numerous bugfixes
9665 * All keywords are now strict and may not be used as identifiers anywhere
9666 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9667 'of', 'with', 'to', 'class'.
9668 * Classes are replaced with simpler structs
9669 * Explicit method self types
9670 * `ret` became `return` and `alt` became `match`
9671 * `import` is now `use`; `use is now `extern mod`
9672 * `extern mod { ... }` is now `extern { ... }`
9673 * `use mod` is the recommended way to import modules
9674 * `pub` and `priv` replace deprecated export lists
9675 * The syntax of `match` pattern arms now uses fat arrow (=>)
9676 * `main` no longer accepts an args vector; use `os::args` instead
9679 * Trait implementations are now coherent, ala Haskell typeclasses
9680 * Trait methods may be static
9681 * Argument modes are deprecated
9682 * Borrowed pointers are much more mature and recommended for use
9683 * Strings and vectors in the static region are stored in constant memory
9684 * Typestate was removed
9685 * Resolution rewritten to be more reliable
9686 * Support for 'dual-mode' data structures (freezing and thawing)
9689 * Most binary operators can now be overloaded via the traits in
9691 * `std::net::url` for representing URLs
9692 * Sendable hash maps in `core::send_map`
9693 * `core::task' gained a (currently unsafe) task-local storage API
9696 * An efficient new intertask communication primitive called the pipe,
9697 along with a number of higher-level channel types, in `core::pipes`
9698 * `std::arc`, an atomically reference counted, immutable, shared memory
9700 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9701 * Futures are now based on pipes and sendable
9702 * More robust linked task failure
9703 * Improved task builder API
9706 * Improved error reporting
9707 * Preliminary JIT support
9708 * Preliminary work on precise GC
9709 * Extensive architectural improvements to rustc
9710 * Begun a transition away from buggy C++-based reflection (shape) code to
9711 Rust-based (visitor) code
9712 * All hash functions and tables converted to secure, randomized SipHash
9715 Version 0.3 (2012-07-12)
9716 ========================
9718 * ~1900 changes, numerous bugfixes
9720 * New coding conveniences
9721 * Integer-literal suffix inference
9722 * Per-item control over warnings, errors
9723 * #[cfg(windows)] and #[cfg(unix)] attributes
9724 * Documentation comments
9725 * More compact closure syntax
9726 * 'do' expressions for treating higher-order functions as
9728 * *-patterns (wildcard extended to all constructor fields)
9731 * Name resolution pass and exhaustiveness checker rewritten
9732 * Region pointers and borrow checking supersede alias
9734 * Init-ness checking is now provided by a region-based liveness
9735 pass instead of the typestate pass; same for last-use analysis
9736 * Extensive work on region pointers
9738 * Experimental new language features
9739 * Slices and fixed-size, interior-allocated vectors
9740 * #!-comments for lang versioning, shell execution
9741 * Destructors and iface implementation for classes;
9742 type-parameterized classes and class methods
9743 * 'const' type kind for types that can be used to implement
9744 shared-memory concurrency patterns
9748 * Removal of various obsolete features
9749 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9750 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9752 * Constructs: do-while loops ('do' repurposed), fn binding,
9753 resources (replaced by destructors)
9755 * Compiler reorganization
9756 * Syntax-layer of compiler split into separate crate
9757 * Clang (from LLVM project) integrated into build
9758 * Typechecker split into sub-modules
9761 * New time functions
9762 * Extension methods for many built-in types
9763 * Arc: atomic-refcount read-only / exclusive-use shared cells
9764 * Par: parallel map and search routines
9765 * Extensive work on libuv interface
9766 * Much vector code moved to libraries
9767 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9768 #include, #include_str, #include_bin
9771 * Cargo automatically resolves dependencies
9774 Version 0.2 (2012-03-29)
9775 =========================
9777 * >1500 changes, numerous bugfixes
9779 * New docs and doc tooling
9781 * New port: FreeBSD x86_64
9783 * Compilation model enhancements
9784 * Generics now specialized, multiply instantiated
9785 * Functions now inlined across separate crates
9787 * Scheduling, stack and threading fixes
9788 * Noticeably improved message-passing performance
9789 * Explicit schedulers
9793 * Experimental new language features
9794 * Operator overloading
9798 * Various language extensions
9799 * C-callback function types: 'crust fn ...'
9800 * Infinite-loop construct: 'loop { ... }'
9801 * Shorten 'mutable' to 'mut'
9802 * Required mutable-local qualifier: 'let mut ...'
9803 * Basic glob-exporting: 'export foo::*;'
9804 * Alt now exhaustive, 'alt check' for runtime-checked
9805 * Block-function form of 'for' loop, with 'break' and 'ret'.
9808 * AST quasi-quote syntax extension
9809 * Revived libuv interface
9810 * New modules: core::{future, iter}, std::arena
9811 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9812 * Extensive cleanup, regularization in libstd, libcore
9815 Version 0.1 (2012-01-20)
9816 ===============================
9818 * Most language features work, including:
9819 * Unique pointers, unique closures, move semantics
9820 * Interface-constrained generics
9821 * Static interface dispatch
9823 * Multithread task scheduling
9824 * Typestate predicates
9825 * Failure unwinding, destructors
9826 * Pattern matching and destructuring assignment
9827 * Lightweight block-lambda syntax
9828 * Preliminary macro-by-example
9830 * Compiler works with the following configurations:
9831 * Linux: x86 and x86_64 hosts and targets
9832 * macOS: x86 and x86_64 hosts and targets
9833 * Windows: x86 hosts and targets
9835 * Cross compilation / multi-target configuration supported.
9837 * Preliminary API-documentation and package-management tools included.
9841 * Documentation is incomplete.
9843 * Performance is below intended target.
9845 * Standard library APIs are subject to extensive change, reorganization.
9847 * Language-level versioning is not yet operational - future code will