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.][79135] 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::fill_with`]
67 - [`slice::split_inclusive_mut`]
68 - [`slice::split_inclusive`]
69 - [`slice::strip_prefix`]
70 - [`slice::strip_suffix`]
71 - [`str::split_inclusive`]
78 - [Rustdoc will now include documentation for methods available from `Deref` traits.][80653]
79 - [You can now provide a `--default-theme` flag which sets the default theme to use for
80 documentation.][79642]
82 Various improvements to intra-doc links:
84 - [You can link to non-path primitives such as `slice`.][80181]
85 - [You can link to associated items.][74489]
86 - [You can now link to items with generics such as `Vec<T>`.][76934]
90 - [You can now pass `--include-ignored` to tests (e.g. with
91 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
96 - [Bumped the minimum `g++` for `linux-gnu` targets to `g++-8` from `g++-7`.][81521]
97 - [WASI platforms no longer use the `wasm-bindgen` ABI.][79998]
98 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
104 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
106 [79135]: https://github.com/rust-lang/rust/pull/79135
107 [74489]: https://github.com/rust-lang/rust/pull/74489
108 [76934]: https://github.com/rust-lang/rust/pull/76934
109 [79570]: https://github.com/rust-lang/rust/pull/79570
110 [80181]: https://github.com/rust-lang/rust/pull/80181
111 [79642]: https://github.com/rust-lang/rust/pull/79642
112 [80945]: https://github.com/rust-lang/rust/pull/80945
113 [80279]: https://github.com/rust-lang/rust/pull/80279
114 [80053]: https://github.com/rust-lang/rust/pull/80053
115 [79502]: https://github.com/rust-lang/rust/pull/79502
116 [75180]: https://github.com/rust-lang/rust/pull/75180
117 [79135]: https://github.com/rust-lang/rust/pull/79135
118 [81521]: https://github.com/rust-lang/rust/pull/81521
119 [80968]: https://github.com/rust-lang/rust/pull/80968
120 [80959]: https://github.com/rust-lang/rust/pull/80959
121 [80718]: https://github.com/rust-lang/rust/pull/80718
122 [80653]: https://github.com/rust-lang/rust/pull/80653
123 [80579]: https://github.com/rust-lang/rust/pull/80579
124 [79998]: https://github.com/rust-lang/rust/pull/79998
125 [78044]: https://github.com/rust-lang/rust/pull/78044
126 [81455]: https://github.com/rust-lang/rust/pull/81455
127 [80764]: https://github.com/rust-lang/rust/pull/80764
128 [80749]: https://github.com/rust-lang/rust/pull/80749
129 [80662]: https://github.com/rust-lang/rust/pull/80662
130 [77885]: https://github.com/rust-lang/rust/pull/77885
131 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
132 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
133 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
134 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
135 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
136 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
137 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
138 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
139 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
140 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
141 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
142 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
143 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
144 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
145 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
146 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
147 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
148 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
150 Version 1.50.0 (2021-02-11)
151 ============================
154 -----------------------
155 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
156 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
157 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
160 -----------------------
161 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
162 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
163 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
165 \* Refer to Rust's [platform support page][forge-platform-support] for more
166 information on Rust's tiered platform support.
169 -----------------------
171 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
172 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
173 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
174 This value cannot be a valid file descriptor, and now means `Option<File>` takes
175 up the same amount of space as `File`.
181 - [`btree_map::Entry::or_insert_with_key`]
184 - [`hash_map::Entry::or_insert_with_key`]
188 - [`UnsafeCell::get_mut`]
190 The following previously stable methods are now `const`.
192 - [`IpAddr::is_ipv4`]
193 - [`IpAddr::is_ipv6`]
196 - [`Layout::from_size_align`]
197 - `pow` for all integer types.
198 - `checked_pow` for all integer types.
199 - `saturating_pow` for all integer types.
200 - `wrapping_pow` for all integer types.
201 - `next_power_of_two` for all unsigned integer types.
202 - `checked_power_of_two` for all unsigned integer types.
205 -----------------------
207 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
208 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
209 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
210 contents of that directory for changes.][cargo/8973]
211 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
216 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
217 - [Running tests will now print the total time taken to execute.][75752]
222 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
223 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
224 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
225 unhygenic `macro_rules!` macros.][79472]
226 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
227 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
228 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
229 - [Dropped support for all cloudabi targets.][78439]
230 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
231 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
232 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
234 [74989]: https://github.com/rust-lang/rust/pull/74989
235 [79261]: https://github.com/rust-lang/rust/pull/79261
236 [79896]: https://github.com/rust-lang/rust/pull/79896
237 [79484]: https://github.com/rust-lang/rust/pull/79484
238 [79472]: https://github.com/rust-lang/rust/pull/79472
239 [79270]: https://github.com/rust-lang/rust/pull/79270
240 [79003]: https://github.com/rust-lang/rust/pull/79003
241 [78864]: https://github.com/rust-lang/rust/pull/78864
242 [78636]: https://github.com/rust-lang/rust/pull/78636
243 [78439]: https://github.com/rust-lang/rust/pull/78439
244 [78343]: https://github.com/rust-lang/rust/pull/78343
245 [78296]: https://github.com/rust-lang/rust/pull/78296
246 [78068]: https://github.com/rust-lang/rust/pull/78068
247 [75752]: https://github.com/rust-lang/rust/pull/75752
248 [74699]: https://github.com/rust-lang/rust/pull/74699
249 [78142]: https://github.com/rust-lang/rust/pull/78142
250 [77484]: https://github.com/rust-lang/rust/pull/77484
251 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
252 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
253 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
254 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
255 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
256 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
257 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
258 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
259 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
260 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
261 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
262 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
263 [`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
264 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
265 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
266 [`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
267 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
270 Version 1.49.0 (2020-12-31)
271 ============================
274 -----------------------
276 - [Unions can now implement `Drop`, and you can now have a field in a union
277 with `ManuallyDrop<T>`.][77547]
278 - [You can now cast uninhabited enums to integers.][76199]
279 - [You can now bind by reference and by move in patterns.][76119] This
280 allows you to selectively borrow individual components of a type. E.g.
288 let person = Person {
289 name: String::from("Alice"),
293 // `name` is moved out of person, but `age` is referenced.
294 let Person { name, ref age } = person;
295 println!("{} {}", name, age);
299 -----------------------
301 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
302 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
303 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
304 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
305 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
306 - [Output from threads spawned in tests is now captured.][78227]
307 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
309 \* Refer to Rust's [platform support page][forge-platform-support] for more
310 information on Rust's tiered platform support.
313 -----------------------
315 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
316 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
321 - [`slice::select_nth_unstable`]
322 - [`slice::select_nth_unstable_by`]
323 - [`slice::select_nth_unstable_by_key`]
325 The following previously stable methods are now `const`.
328 - [`Poll::is_pending`]
331 -----------------------
332 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
333 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
334 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
335 variable will be set if the crate being built is one the user selected to build, either
336 with `-p` or through defaults.
337 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
343 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
344 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
345 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
346 Previously such invalid or unused attributes could be ignored.
347 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
348 read [this post about the changes][rustdoc-ws-post] for more details.
349 - [Trait bounds are no longer inferred for associated types.][79904]
353 These changes provide no direct user facing benefits, but represent significant
354 improvements to the internals and overall performance of rustc and
357 - [rustc's internal crates are now compiled using the `initial-exec` Thread
358 Local Storage model.][78201]
359 - [Calculate visibilities once in resolve.][78077]
360 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
361 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
364 [75991]: https://github.com/rust-lang/rust/pull/75991
365 [78951]: https://github.com/rust-lang/rust/pull/78951
366 [78848]: https://github.com/rust-lang/rust/pull/78848
367 [78746]: https://github.com/rust-lang/rust/pull/78746
368 [78376]: https://github.com/rust-lang/rust/pull/78376
369 [78228]: https://github.com/rust-lang/rust/pull/78228
370 [78227]: https://github.com/rust-lang/rust/pull/78227
371 [78201]: https://github.com/rust-lang/rust/pull/78201
372 [78109]: https://github.com/rust-lang/rust/pull/78109
373 [78077]: https://github.com/rust-lang/rust/pull/78077
374 [77997]: https://github.com/rust-lang/rust/pull/77997
375 [77703]: https://github.com/rust-lang/rust/pull/77703
376 [77547]: https://github.com/rust-lang/rust/pull/77547
377 [77015]: https://github.com/rust-lang/rust/pull/77015
378 [76199]: https://github.com/rust-lang/rust/pull/76199
379 [76119]: https://github.com/rust-lang/rust/pull/76119
380 [75914]: https://github.com/rust-lang/rust/pull/75914
381 [79004]: https://github.com/rust-lang/rust/pull/79004
382 [78676]: https://github.com/rust-lang/rust/pull/78676
383 [79904]: https://github.com/rust-lang/rust/issues/79904
384 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
385 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
386 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
387 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
388 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
389 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
390 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
391 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
392 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
393 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
394 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
396 Version 1.48.0 (2020-11-19)
397 ==========================
402 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
403 is still rejected *semantically*, but can now be parsed by procedural macros.
407 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
408 `rustc` whether to link its own C runtime and libraries or to rely on a external
409 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
410 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
411 Note: If you're using cargo you must explicitly pass the `--target` flag.
412 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
414 \* Refer to Rust's [platform support page][forge-platform-support] for more
415 information on Rust's tiered platform support.
419 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
420 and `&Stderr`.][76275]
421 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
422 - [The `matches!` macro now supports having a trailing comma.][74880]
423 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
424 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
428 - [`slice::as_ptr_range`]
429 - [`slice::as_mut_ptr_range`]
430 - [`VecDeque::make_contiguous`]
431 - [`future::pending`]
434 The following previously stable methods are now `const fn`'s:
436 - [`Option::is_some`]
437 - [`Option::is_none`]
442 - [`Ordering::reverse`]
450 - [You can now link to items in `rustdoc` using the intra-doc link
451 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
452 a link to `std::future`'s documentation. See ["Linking to items by
453 name"][intradoc-links] for more information.
454 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
455 when searching through `rustdoc`'s UI.][75740]
459 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
460 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
461 promoted to `'static` lifetime any more inside `const fn`s.
462 - [Associated type bindings on trait objects are now verified to meet the bounds
463 declared on the trait when checking that they implement the trait.][27675]
464 - [When trait bounds on associated types or opaque types are ambiguous, the
465 compiler no longer makes an arbitrary choice on which bound to use.][54121]
466 - [Fixed recursive nonterminals not being expanded in macros during
467 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
468 correctly handling recursive nonterminal tokens.
469 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
470 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
471 in places where they have no effect.][73461]
472 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
473 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
474 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
475 disallow zero-initialization.][71274]
476 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
477 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
478 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
479 see the [`catch_unwind`] documentation for further information.
485 These changes provide no direct user facing benefits, but represent significant
486 improvements to the internals and overall performance of rustc and
489 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
490 You can continue building with `make` by setting `ninja=false` in
492 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
493 - [Made `ensure_sufficient_stack()` non-generic][76680]
495 [78143]: https://github.com/rust-lang/rust/issues/78143
496 [76680]: https://github.com/rust-lang/rust/pull/76680/
497 [76030]: https://github.com/rust-lang/rust/pull/76030/
498 [70212]: https://github.com/rust-lang/rust/pull/70212/
499 [27675]: https://github.com/rust-lang/rust/issues/27675/
500 [54121]: https://github.com/rust-lang/rust/issues/54121/
501 [71274]: https://github.com/rust-lang/rust/pull/71274/
502 [77386]: https://github.com/rust-lang/rust/pull/77386/
503 [77153]: https://github.com/rust-lang/rust/pull/77153/
504 [77055]: https://github.com/rust-lang/rust/pull/77055/
505 [76275]: https://github.com/rust-lang/rust/pull/76275/
506 [76310]: https://github.com/rust-lang/rust/pull/76310/
507 [76420]: https://github.com/rust-lang/rust/pull/76420/
508 [76158]: https://github.com/rust-lang/rust/pull/76158/
509 [75857]: https://github.com/rust-lang/rust/pull/75857/
510 [75585]: https://github.com/rust-lang/rust/pull/75585/
511 [75740]: https://github.com/rust-lang/rust/pull/75740/
512 [75502]: https://github.com/rust-lang/rust/pull/75502/
513 [74880]: https://github.com/rust-lang/rust/pull/74880/
514 [74922]: https://github.com/rust-lang/rust/pull/74922/
515 [74430]: https://github.com/rust-lang/rust/pull/74430/
516 [74194]: https://github.com/rust-lang/rust/pull/74194/
517 [73461]: https://github.com/rust-lang/rust/pull/73461/
518 [73166]: https://github.com/rust-lang/rust/pull/73166/
519 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
520 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
521 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
522 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
523 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
524 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
525 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
526 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
527 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
528 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
529 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
530 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
531 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
532 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
533 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
536 Version 1.47.0 (2020-10-08)
537 ==========================
541 - [Closures will now warn when not used.][74869]
545 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
546 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
548 - [Upgraded to LLVM 11.][73526]
549 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
550 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
551 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
553 \* Refer to Rust's [platform support page][forge-platform-support] for more
554 information on Rust's tiered platform support.
558 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
559 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
560 those of length less than 33.][74060]
561 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
562 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
563 `PartialEq`, and `PartialOrd`.][73583]
568 - [`Range::is_empty`]
569 - [`RangeInclusive::is_empty`]
570 - [`Result::as_deref`]
571 - [`Result::as_deref_mut`]
573 - [`pointer::offset_from`]
577 The following previously stable APIs have now been made const.
579 - [The `new` method for all `NonZero` integers.][73858]
580 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
581 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
582 methods for all integers.][73858]
583 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
584 signed integers.][73858]
585 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
586 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
587 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
588 `is_ascii_control` methods for `char` and `u8`.][73858]
592 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
593 You can override this by setting the following in your `Cargo.toml`.
595 [profile.release.build-override]
598 - [`cargo-help` will now display man pages for commands rather just the
599 `--help` text.][cargo/8456]
600 - [`cargo-metadata` now emits a `test` field indicating if a target has
601 tests enabled.][cargo/8478]
602 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
603 - [`cargo-publish` will now use an alternative registry by default if it's the
604 only registry specified in `package.publish`.][cargo/8571]
608 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
609 type based search.][75366]
610 - [Added the Ayu theme to rustdoc.][71237]
614 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
615 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
616 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
617 help to preserve more span information.][73084] These changes may cause
618 compiliation errors if your macro was unhygenic or didn't correctly handle
620 - [Moved support for the CloudABI target to tier 3.][75568]
621 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
622 - [Added the `rustc-docs` component.][75560] This allows you to install
623 and read the documentation for the compiler internal APIs. (Currently only
624 available for `x86_64-unknown-linux-gnu`.)
629 - [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.
631 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
632 [75048]: https://github.com/rust-lang/rust/pull/75048/
633 [74163]: https://github.com/rust-lang/rust/pull/74163/
634 [71237]: https://github.com/rust-lang/rust/pull/71237/
635 [74869]: https://github.com/rust-lang/rust/pull/74869/
636 [73858]: https://github.com/rust-lang/rust/pull/73858/
637 [75716]: https://github.com/rust-lang/rust/pull/75716/
638 [75908]: https://github.com/rust-lang/rust/pull/75908/
639 [75516]: https://github.com/rust-lang/rust/pull/75516/
640 [75560]: https://github.com/rust-lang/rust/pull/75560/
641 [75568]: https://github.com/rust-lang/rust/pull/75568/
642 [75366]: https://github.com/rust-lang/rust/pull/75366/
643 [75204]: https://github.com/rust-lang/rust/pull/75204/
644 [74650]: https://github.com/rust-lang/rust/pull/74650/
645 [74419]: https://github.com/rust-lang/rust/pull/74419/
646 [73964]: https://github.com/rust-lang/rust/pull/73964/
647 [74021]: https://github.com/rust-lang/rust/pull/74021/
648 [74060]: https://github.com/rust-lang/rust/pull/74060/
649 [73893]: https://github.com/rust-lang/rust/pull/73893/
650 [73526]: https://github.com/rust-lang/rust/pull/73526/
651 [73583]: https://github.com/rust-lang/rust/pull/73583/
652 [73084]: https://github.com/rust-lang/rust/pull/73084/
653 [73197]: https://github.com/rust-lang/rust/pull/73197/
654 [72488]: https://github.com/rust-lang/rust/pull/72488/
655 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
656 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
657 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
658 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
659 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
660 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
661 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
662 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
663 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
664 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
665 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
666 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
667 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
668 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
669 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
672 Version 1.46.0 (2020-08-27)
673 ==========================
677 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
678 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
679 const functions.][73862]
680 - [The `#[track_caller]` attribute can now be added to functions to use the
681 function's caller's location information for panic messages.][72445]
682 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
683 `x.0.0` over `(x.0).0`.
684 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
685 You currently can't use `mem::transmute` in constant functions.
689 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
690 - [Enabled static "Position Independent Executables" by default
691 for `x86_64-unknown-linux-musl`.][70740]
695 - [`mem::forget` is now a `const fn`.][73887]
696 - [`String` now implements `From<char>`.][73466]
697 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
698 integer types.][73032]
699 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
700 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
701 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
702 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
703 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
704 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
709 - [`vec::Drain::as_slice`]
713 Added a number of new environment variables that are now available when
714 compiling your crate.
716 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
717 the specific binary being compiled and the name of the crate.
718 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
719 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
723 - [The target configuration option `abi_blacklist` has been renamed
724 to `unsupported_abis`.][74150] The old name will still continue to work.
725 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
726 This was previously accepted but will become a hard error in a future release.
727 - [Rustc will fail to compile if you have a struct with
728 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
730 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
731 ensure that spans have the correct information, and may cause breakage if you
732 were relying on receiving spans with dummy information.
733 - [The InnoSetup installer for Windows is no longer available.][72569] This was
734 a legacy installer that was replaced by a MSI installer a few years ago but
735 was still being built.
736 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
737 - [Rustc will no longer accept overlapping trait implementations that only
738 differ in how the lifetime was bound.][72493]
739 - [Rustc now correctly relates the lifetime of an existential associated
740 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
741 you to pass a shorter lifetime than expected.
742 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
743 The library will need to be installed for `rustc` to work, even though we
744 expect it to be already available on most systems.
745 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
747 - [Pretty printing of some tokens in procedural macros changed.][75453] The
748 exact output returned by rustc's pretty printing is an unstable
749 implementation detail: we recommend any macro relying on it to switch to a
750 more robust parsing system.
752 [75453]: https://github.com/rust-lang/rust/issues/75453/
753 [74820]: https://github.com/rust-lang/rust/issues/74820/
754 [74420]: https://github.com/rust-lang/rust/issues/74420/
755 [74109]: https://github.com/rust-lang/rust/pull/74109/
756 [74150]: https://github.com/rust-lang/rust/pull/74150/
757 [73862]: https://github.com/rust-lang/rust/pull/73862/
758 [73887]: https://github.com/rust-lang/rust/pull/73887/
759 [73466]: https://github.com/rust-lang/rust/pull/73466/
760 [73516]: https://github.com/rust-lang/rust/pull/73516/
761 [73293]: https://github.com/rust-lang/rust/pull/73293/
762 [73007]: https://github.com/rust-lang/rust/pull/73007/
763 [73032]: https://github.com/rust-lang/rust/pull/73032/
764 [72920]: https://github.com/rust-lang/rust/pull/72920/
765 [72569]: https://github.com/rust-lang/rust/pull/72569/
766 [72583]: https://github.com/rust-lang/rust/pull/72583/
767 [72584]: https://github.com/rust-lang/rust/pull/72584/
768 [72717]: https://github.com/rust-lang/rust/pull/72717/
769 [72437]: https://github.com/rust-lang/rust/pull/72437/
770 [72445]: https://github.com/rust-lang/rust/pull/72445/
771 [72486]: https://github.com/rust-lang/rust/pull/72486/
772 [72493]: https://github.com/rust-lang/rust/pull/72493/
773 [72331]: https://github.com/rust-lang/rust/pull/72331/
774 [71896]: https://github.com/rust-lang/rust/pull/71896/
775 [71660]: https://github.com/rust-lang/rust/pull/71660/
776 [71322]: https://github.com/rust-lang/rust/pull/71322/
777 [70740]: https://github.com/rust-lang/rust/pull/70740/
778 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
779 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
780 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
781 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
782 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
785 Version 1.45.2 (2020-08-03)
786 ==========================
788 * [Fix bindings in tuple struct patterns][74954]
789 * [Fix track_caller integration with trait objects][74784]
791 [74954]: https://github.com/rust-lang/rust/issues/74954
792 [74784]: https://github.com/rust-lang/rust/issues/74784
795 Version 1.45.1 (2020-07-30)
796 ==========================
798 * [Fix const propagation with references.][73613]
799 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
800 * [Avoid spurious implicit region bound.][74509]
801 * [Install clippy on x.py install][74457]
803 [73613]: https://github.com/rust-lang/rust/pull/73613
804 [73078]: https://github.com/rust-lang/rust/issues/73078
805 [74509]: https://github.com/rust-lang/rust/pull/74509
806 [74457]: https://github.com/rust-lang/rust/pull/74457
809 Version 1.45.0 (2020-07-16)
810 ==========================
814 - [Out of range float to int conversions using `as` has been defined as a saturating
815 conversion.][71269] This was previously undefined behaviour, but you can use the
816 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
817 may be desirable in rare performance sensitive situations.
818 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
820 - [Function like procedural macros can now be used in expression, pattern, and statement
821 positions.][68717] This means you can now use a function-like procedural macro
822 anywhere you can use a declarative (`macro_rules!`) macro.
826 - [You can now override individual target features through the `target-feature`
827 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
828 equivalent to `-C target-feature=+avx2,+fma`.
829 - [Added the `force-unwind-tables` flag.][69984] This option allows
830 rustc to always generate unwind tables regardless of panic strategy.
831 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
832 to include LLVM bitcode into generated `rlib`s (this is on by default).
833 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
834 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
835 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
836 - [Upgraded to LLVM 10.][67759]
838 \* Refer to Rust's [platform support page][forge-platform-support] for more
839 information on Rust's tiered platform support.
844 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
846 - [`proc_macro::TokenStream` now implements `Default`.][72234]
847 - [You can now use `char` with
848 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
849 a range of codepoints.][72413] E.g.
850 you can now write the following;
852 for ch in 'a'..='z' {
856 // Prints "abcdefghijklmnopqrstuvwxyz"
858 - [`OsString` now implements `FromStr`.][71662]
859 - [The `saturating_neg` method has been added to all signed integer primitive
860 types, and the `saturating_abs` method has been added for all integer
861 primitive types.][71886]
862 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
863 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
865 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
866 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
867 integer types.][69813]
868 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
869 integer types.][72324]
870 - [The `fetch_update` method has been added to all atomic integer types.][71843]
875 - [`BTreeMap::remove_entry`]
877 - [`rc::Weak::as_ptr`]
878 - [`rc::Weak::from_raw`]
879 - [`rc::Weak::into_raw`]
880 - [`str::strip_prefix`]
881 - [`str::strip_suffix`]
882 - [`sync::Weak::as_ptr`]
883 - [`sync::Weak::from_raw`]
884 - [`sync::Weak::into_raw`]
885 - [`char::UNICODE_VERSION`]
886 - [`Span::resolved_at`]
887 - [`Span::located_at`]
888 - [`Span::mixed_site`]
889 - [`unix::process::CommandExt::arg0`]
894 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
899 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
900 `~~outdated information~~` becomes "~~outdated information~~".
901 - [Added an emoji to Rustdoc's deprecated API message.][72014]
905 - [Trying to self initialize a static value (that is creating a value using
906 itself) is unsound and now causes a compile error.][71140]
907 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
908 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
909 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
910 previously undocumented and not intended for public use. Rustdoc still provides
911 a non-zero exit code on errors.
912 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
913 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
914 flags while cargo is adding `embed-bitcode` itself. The recommended way to
915 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
916 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
920 - [Make clippy a git subtree instead of a git submodule][70655]
921 - [Unify the undo log of all snapshot types][69464]
923 [71848]: https://github.com/rust-lang/rust/issues/71848/
924 [73420]: https://github.com/rust-lang/rust/issues/73420/
925 [72324]: https://github.com/rust-lang/rust/pull/72324/
926 [71843]: https://github.com/rust-lang/rust/pull/71843/
927 [71886]: https://github.com/rust-lang/rust/pull/71886/
928 [72234]: https://github.com/rust-lang/rust/pull/72234/
929 [72239]: https://github.com/rust-lang/rust/pull/72239/
930 [72397]: https://github.com/rust-lang/rust/pull/72397/
931 [72413]: https://github.com/rust-lang/rust/pull/72413/
932 [72014]: https://github.com/rust-lang/rust/pull/72014/
933 [72062]: https://github.com/rust-lang/rust/pull/72062/
934 [72094]: https://github.com/rust-lang/rust/pull/72094/
935 [72133]: https://github.com/rust-lang/rust/pull/72133/
936 [67759]: https://github.com/rust-lang/rust/pull/67759/
937 [71900]: https://github.com/rust-lang/rust/pull/71900/
938 [71928]: https://github.com/rust-lang/rust/pull/71928/
939 [71662]: https://github.com/rust-lang/rust/pull/71662/
940 [71716]: https://github.com/rust-lang/rust/pull/71716/
941 [71447]: https://github.com/rust-lang/rust/pull/71447/
942 [71269]: https://github.com/rust-lang/rust/pull/71269/
943 [71095]: https://github.com/rust-lang/rust/pull/71095/
944 [71140]: https://github.com/rust-lang/rust/pull/71140/
945 [70655]: https://github.com/rust-lang/rust/pull/70655/
946 [70705]: https://github.com/rust-lang/rust/pull/70705/
947 [69984]: https://github.com/rust-lang/rust/pull/69984/
948 [69813]: https://github.com/rust-lang/rust/pull/69813/
949 [69464]: https://github.com/rust-lang/rust/pull/69464/
950 [68717]: https://github.com/rust-lang/rust/pull/68717/
951 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
952 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
953 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
954 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
955 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
956 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
957 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
958 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
959 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
960 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
961 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
962 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
963 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
964 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
965 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
966 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
967 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
970 Version 1.44.1 (2020-06-18)
971 ===========================
973 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
974 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
975 * [Fix crashes when finding backtrace on macOS.][71397]
976 * [Clippy applies lint levels into different files.][clippy/5356]
978 [71397]: https://github.com/rust-lang/rust/issues/71397
979 [73078]: https://github.com/rust-lang/rust/issues/73078
980 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
981 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
984 Version 1.44.0 (2020-06-04)
985 ==========================
989 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
990 - [Added the `unused_braces` lint.][70081]
992 **Syntax-only changes**
994 - [Expansion-driven outline module parsing][69838]
999 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1004 These are still rejected semantically, so you will likely receive an error but
1005 these changes can be seen and parsed by macros and conditional compilation.
1009 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1010 Additionally when in incremental mode rustc defaults to 256 codegen units.
1011 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1012 a panic is thrown.][67502]
1013 - [Added tier 3\* support for the `aarch64-unknown-none` and
1014 `aarch64-unknown-none-softfloat` targets.][68334]
1015 - [Added tier 3 support for `arm64-apple-tvos` and
1016 `x86_64-apple-tvos` targets.][68191]
1021 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1022 `vec![]` to be able to be used in `const` contexts.
1023 - [`convert::Infallible` now implements `Hash`.][70281]
1024 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1025 a `&mut OsStr`.][70048]
1026 - [Unicode 13 is now supported.][69929]
1027 - [`String` now implements `From<&mut str>`.][69661]
1028 - [`IoSlice` now implements `Copy`.][69403]
1029 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1030 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1031 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1032 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1033 integer types.][69373]
1037 - [`PathBuf::with_capacity`]
1038 - [`PathBuf::capacity`]
1039 - [`PathBuf::clear`]
1040 - [`PathBuf::reserve`]
1041 - [`PathBuf::reserve_exact`]
1042 - [`PathBuf::shrink_to_fit`]
1043 - [`f32::to_int_unchecked`]
1044 - [`f64::to_int_unchecked`]
1045 - [`Layout::align_to`]
1046 - [`Layout::pad_to_align`]
1048 - [`Layout::extend`]
1052 - [Added the `cargo tree` command which will print a tree graph of
1053 your dependencies.][cargo/8062] E.g.
1055 mdbook v0.3.2 (/Users/src/rust/mdbook)
1057 │ ├── html5ever v0.24.0
1059 │ │ │ └── cfg-if v0.1.9
1061 │ │ └── markup5ever v0.9.0
1062 │ │ ├── log v0.4.8 (*)
1064 │ │ │ └── phf_shared v0.7.24
1065 │ │ │ ├── siphasher v0.2.3
1066 │ │ │ └── unicase v1.4.2
1067 │ │ │ [build-dependencies]
1068 │ │ │ └── version_check v0.1.5
1071 You can also display dependencies on multiple versions of the same crate with
1072 `cargo tree -d` (short for `cargo tree --duplicates`).
1076 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1077 the version in the sidebar.][69494]
1081 - [Rustc now correctly generates static libraries on Windows GNU targets with
1082 the `.a` extension, rather than the previous `.lib`.][70937]
1083 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1084 - [The `file_name` property in JSON output of macro errors now points the actual
1085 source file rather than the previous format of `<NAME macros>`.][70969]
1086 **Note:** this may not point to a file that actually exists on the user's system.
1087 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1088 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1089 not allow zero initialization such as `NonZeroU8`.][66059] This was
1090 previously a warning.
1091 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1092 operator has been defined as a saturating operation.][71269] This was previously
1093 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1094 continue using the current behaviour, which may be desirable in rare performance
1095 sensitive situations.
1099 These changes provide no direct user facing benefits, but represent significant
1100 improvements to the internals and overall performance of rustc and
1103 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1104 - [Replace big JS dict with JSON parsing.][71250]
1106 [69373]: https://github.com/rust-lang/rust/pull/69373/
1107 [66059]: https://github.com/rust-lang/rust/pull/66059/
1108 [68191]: https://github.com/rust-lang/rust/pull/68191/
1109 [68899]: https://github.com/rust-lang/rust/pull/68899/
1110 [71147]: https://github.com/rust-lang/rust/pull/71147/
1111 [71250]: https://github.com/rust-lang/rust/pull/71250/
1112 [70937]: https://github.com/rust-lang/rust/pull/70937/
1113 [70969]: https://github.com/rust-lang/rust/pull/70969/
1114 [70632]: https://github.com/rust-lang/rust/pull/70632/
1115 [70281]: https://github.com/rust-lang/rust/pull/70281/
1116 [70345]: https://github.com/rust-lang/rust/pull/70345/
1117 [70048]: https://github.com/rust-lang/rust/pull/70048/
1118 [70081]: https://github.com/rust-lang/rust/pull/70081/
1119 [70156]: https://github.com/rust-lang/rust/pull/70156/
1120 [71269]: https://github.com/rust-lang/rust/pull/71269/
1121 [69838]: https://github.com/rust-lang/rust/pull/69838/
1122 [69929]: https://github.com/rust-lang/rust/pull/69929/
1123 [69661]: https://github.com/rust-lang/rust/pull/69661/
1124 [69778]: https://github.com/rust-lang/rust/pull/69778/
1125 [69494]: https://github.com/rust-lang/rust/pull/69494/
1126 [69403]: https://github.com/rust-lang/rust/pull/69403/
1127 [69033]: https://github.com/rust-lang/rust/pull/69033/
1128 [68692]: https://github.com/rust-lang/rust/pull/68692/
1129 [68334]: https://github.com/rust-lang/rust/pull/68334/
1130 [67502]: https://github.com/rust-lang/rust/pull/67502/
1131 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1132 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1133 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1134 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1135 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1136 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1137 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1138 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1139 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1140 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1141 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1142 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1143 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1146 Version 1.43.1 (2020-05-07)
1147 ===========================
1149 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1150 * [Fixed the stabilization of AVX-512 features.][71473]
1151 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1153 [71430]: https://github.com/rust-lang/rust/pull/71430
1154 [71473]: https://github.com/rust-lang/rust/issues/71473
1155 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1158 Version 1.43.0 (2020-04-23)
1159 ==========================
1163 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1164 the type inferred correctly.][68129]
1165 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1167 **Syntax only changes**
1168 - [Allow `type Foo: Ord` syntactically.][69361]
1169 - [Fuse associated and extern items up to defaultness.][69194]
1170 - [Syntactically allow `self` in all `fn` contexts.][68764]
1171 - [Merge `fn` syntax + cleanup item parsing.][68728]
1172 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1173 For example, you may now write:
1175 macro_rules! mac_trait {
1185 These are still rejected *semantically*, so you will likely receive an error but
1186 these changes can be seen and parsed by macros and
1187 conditional compilation.
1192 - [You can now pass multiple lint flags to rustc to override the previous
1193 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1194 everything in the `unused` lint group except `unused-variables` which
1195 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1196 everything in the `unused` lint group **including** `unused-variables` since
1197 the allow flag is specified before the deny flag (and therefore overridden).
1198 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1199 if they are available on `windows-gnu`.][67429]
1200 - [rustc now buffers errors/warnings printed in JSON.][69227]
1204 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1205 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1206 respectively.][69538] **Note** These conversions are only available when `N`
1208 - [You can now use associated constants on floats and integers directly, rather
1209 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1210 `f32::NAN` with no imports.
1211 - [`u8::is_ascii` is now `const`.][68984]
1212 - [`String` now implements `AsMut<str>`.][68742]
1213 - [Added the `primitive` module to `std` and `core`.][67637] This module
1214 reexports Rust's primitive types. This is mainly useful in macros
1215 where you want avoid these types being shadowed.
1216 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1217 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1221 - [`Once::is_completed`]
1226 - [`iter::once_with`]
1230 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1231 your environment.][cargo/7823]
1232 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1233 executable path when running integration tests or benchmarks.][cargo/7697]
1234 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1235 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1239 - [Certain checks in the `const_err` lint were deemed unrelated to const
1240 evaluation][69185], and have been moved to the `unconditional_panic` and
1241 `arithmetic_overflow` lints.
1246 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1247 has been a warning since 1.36.0.
1248 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1249 led to some instances being accepted, and now correctly emits a hard error.
1251 [69340]: https://github.com/rust-lang/rust/pull/69340
1255 These changes provide no direct user facing benefits, but represent significant
1256 improvements to the internals and overall performance of `rustc` and
1259 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1260 - [Improved how rustc generates drop code.][67332]
1261 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1262 - [traits: preallocate 2 Vecs of known initial size][69022]
1263 - [Avoid exponential behaviour when relating types][68772]
1264 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1265 - [Improve performance of coherence checks][68966]
1266 - [Deduplicate types in the generator witness][68672]
1267 - [Invert control in struct_lint_level.][68725]
1269 [67332]: https://github.com/rust-lang/rust/pull/67332/
1270 [67429]: https://github.com/rust-lang/rust/pull/67429/
1271 [67637]: https://github.com/rust-lang/rust/pull/67637/
1272 [67642]: https://github.com/rust-lang/rust/pull/67642/
1273 [67878]: https://github.com/rust-lang/rust/pull/67878/
1274 [67885]: https://github.com/rust-lang/rust/pull/67885/
1275 [68129]: https://github.com/rust-lang/rust/pull/68129/
1276 [68672]: https://github.com/rust-lang/rust/pull/68672/
1277 [68725]: https://github.com/rust-lang/rust/pull/68725/
1278 [68728]: https://github.com/rust-lang/rust/pull/68728/
1279 [68738]: https://github.com/rust-lang/rust/pull/68738/
1280 [68742]: https://github.com/rust-lang/rust/pull/68742/
1281 [68764]: https://github.com/rust-lang/rust/pull/68764/
1282 [68772]: https://github.com/rust-lang/rust/pull/68772/
1283 [68943]: https://github.com/rust-lang/rust/pull/68943/
1284 [68952]: https://github.com/rust-lang/rust/pull/68952/
1285 [68966]: https://github.com/rust-lang/rust/pull/68966/
1286 [68984]: https://github.com/rust-lang/rust/pull/68984/
1287 [69022]: https://github.com/rust-lang/rust/pull/69022/
1288 [69185]: https://github.com/rust-lang/rust/pull/69185/
1289 [69194]: https://github.com/rust-lang/rust/pull/69194/
1290 [69201]: https://github.com/rust-lang/rust/pull/69201/
1291 [69227]: https://github.com/rust-lang/rust/pull/69227/
1292 [69548]: https://github.com/rust-lang/rust/pull/69548/
1293 [69256]: https://github.com/rust-lang/rust/pull/69256/
1294 [69361]: https://github.com/rust-lang/rust/pull/69361/
1295 [69366]: https://github.com/rust-lang/rust/pull/69366/
1296 [69538]: https://github.com/rust-lang/rust/pull/69538/
1297 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1298 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1299 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1300 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1301 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1302 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1303 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1304 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1307 Version 1.42.0 (2020-03-12)
1308 ==========================
1312 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1314 fn foo(words: &[&str]) {
1316 ["Hello", "World", "!", ..] => println!("Hello World!"),
1317 ["Foo", "Bar", ..] => println!("Baz"),
1318 rest => println!("{:?}", rest),
1322 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1323 that you can create an enum that has the exact layout and ABI of the type
1325 - [There are some *syntax-only* changes:][67131]
1326 - `default` is syntactically allowed before items in `trait` definitions.
1327 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1328 leave out their bodies in favor of `;`.
1329 - Bounds on associated types in `impl`s are now syntactically allowed
1330 (e.g. `type Foo: Ord;`).
1331 - `...` (the C-variadic type) may occur syntactically directly as the type of
1332 any function parameter.
1334 These are still rejected *semantically*, so you will likely receive an error
1335 but these changes can be seen and parsed by procedural macros and
1336 conditional compilation.
1340 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1341 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1342 - [`Option::{expect,unwrap}` and
1343 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1344 pointing to the location where they were called, rather than
1345 `core`'s internals. ][67887]
1347 \* Refer to Rust's [platform support page][forge-platform-support] for more
1348 information on Rust's tiered platform support.
1352 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1353 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1354 to implement `Sized`.][67935]
1355 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1356 - [`Layout::new` is now `const`.][66254]
1357 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1362 - [`CondVar::wait_while`]
1363 - [`CondVar::wait_timeout_while`]
1365 - [`DebugMap::value`]
1366 - [`ManuallyDrop::take`]
1368 - [`ptr::slice_from_raw_parts_mut`]
1369 - [`ptr::slice_from_raw_parts`]
1373 - [You no longer need to include `extern crate proc_macro;` to be able to
1374 `use proc_macro;` in the `2018` edition.][cargo/7700]
1378 - [`Error::description` has been deprecated, and its use will now produce a
1379 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1381 [68253]: https://github.com/rust-lang/rust/pull/68253/
1382 [68348]: https://github.com/rust-lang/rust/pull/68348/
1383 [67935]: https://github.com/rust-lang/rust/pull/67935/
1384 [68339]: https://github.com/rust-lang/rust/pull/68339/
1385 [68122]: https://github.com/rust-lang/rust/pull/68122/
1386 [67712]: https://github.com/rust-lang/rust/pull/67712/
1387 [67887]: https://github.com/rust-lang/rust/pull/67887/
1388 [67131]: https://github.com/rust-lang/rust/pull/67131/
1389 [67233]: https://github.com/rust-lang/rust/pull/67233/
1390 [66899]: https://github.com/rust-lang/rust/pull/66899/
1391 [66919]: https://github.com/rust-lang/rust/pull/66919/
1392 [66254]: https://github.com/rust-lang/rust/pull/66254/
1393 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1394 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1395 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1396 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1397 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1398 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1399 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1400 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1401 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1404 Version 1.41.1 (2020-02-27)
1405 ===========================
1407 * [Always check types of static items][69145]
1408 * [Always check lifetime bounds of `Copy` impls][69145]
1409 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1411 [69225]: https://github.com/rust-lang/rust/issues/69225
1412 [69145]: https://github.com/rust-lang/rust/pull/69145
1415 Version 1.41.0 (2020-01-30)
1416 ===========================
1421 - [You can now pass type parameters to foreign items when implementing
1422 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1423 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1424 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1425 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1426 - [You can now use any valid identifier in a `format_args` macro.][66847]
1427 Previously identifiers starting with an underscore were not allowed.
1428 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1429 enum variants.][66183] These are still rejected semantically, but
1430 can be seen and parsed by procedural macros and conditional compilation.
1435 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1436 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1437 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1438 - [You can now pass an arguments file passing the `@path` syntax
1439 to rustc.][66172] Note that the format differs somewhat from what is
1440 found in other tooling; please see [the documentation][argfile-docs] for
1442 - [You can now provide `--extern` flag without a path, indicating that it is
1443 available from the search path or specified with an `-L` flag.][64882]
1445 \* Refer to Rust's [platform support page][forge-platform-support] for more
1446 information on Rust's tiered platform support.
1448 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1453 - [The `core::panic` module is now stable.][66771] It was already stable
1455 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1456 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1457 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1462 - [`Result::map_or`]
1463 - [`Result::map_or_else`]
1464 - [`std::rc::Weak::weak_count`]
1465 - [`std::rc::Weak::strong_count`]
1466 - [`std::sync::Weak::weak_count`]
1467 - [`std::sync::Weak::strong_count`]
1472 - [Cargo will now document all the private items for binary crates
1473 by default.][cargo/7593]
1474 - [`cargo-install` will now reinstall the package if it detects that it is out
1475 of date.][cargo/7560]
1476 - [Cargo.lock now uses a more git friendly format that should help to reduce
1477 merge conflicts.][cargo/7579]
1478 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1479 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1480 optimisation level to `2` for debug builds. You can also use
1481 `[profile.<profile>.build-override]` to override build scripts and
1487 - [You can now specify `edition` in documentation code blocks to compile the block
1488 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1489 should be compiled the 2018 edition of Rust.
1490 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1491 current theme with `--check-theme`.][54733]
1492 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1497 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1498 Apple targets.][apple-32bit-drop] This means that the source code is still
1499 available to build, but the targets are no longer being tested and release
1500 binaries for those platforms will no longer be distributed by the Rust project.
1501 Please refer to the linked blog post for more information.
1503 [54733]: https://github.com/rust-lang/rust/pull/54733/
1504 [61351]: https://github.com/rust-lang/rust/pull/61351/
1505 [67255]: https://github.com/rust-lang/rust/pull/67255/
1506 [66661]: https://github.com/rust-lang/rust/pull/66661/
1507 [66771]: https://github.com/rust-lang/rust/pull/66771/
1508 [66847]: https://github.com/rust-lang/rust/pull/66847/
1509 [66238]: https://github.com/rust-lang/rust/pull/66238/
1510 [66277]: https://github.com/rust-lang/rust/pull/66277/
1511 [66325]: https://github.com/rust-lang/rust/pull/66325/
1512 [66172]: https://github.com/rust-lang/rust/pull/66172/
1513 [66183]: https://github.com/rust-lang/rust/pull/66183/
1514 [65879]: https://github.com/rust-lang/rust/pull/65879/
1515 [65013]: https://github.com/rust-lang/rust/pull/65013/
1516 [64882]: https://github.com/rust-lang/rust/pull/64882/
1517 [64325]: https://github.com/rust-lang/rust/pull/64325/
1518 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1519 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1520 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1521 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1522 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1523 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1524 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1525 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1526 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1527 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1528 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1530 Version 1.40.0 (2019-12-19)
1531 ===========================
1535 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1536 `const` contexts.][65188] e.g.
1539 pub struct Point(i32, i32);
1541 const ORIGIN: Point = {
1542 let constructor = Point;
1548 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1549 indicate that there may be variants or fields added in the future.][64639]
1550 For example this requires adding a wild-card branch (`_ => {}`) to any match
1551 statements on a non-exhaustive `enum`. [(RFC 2008)]
1552 - [You can now use function-like procedural macros in `extern` blocks and in
1553 type positions.][63931] e.g. `type Generated = macro!();`
1554 - [Function-like and attribute procedural macros can now emit
1555 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1556 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1557 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1558 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1562 - [Added tier 3 support\* for the
1563 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1564 - [Added tier 3 support for the
1565 `aarch64-unknown-none-softfloat` target.][64589]
1566 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1567 `mips64el-unknown-linux-muslabi64` targets.][65843]
1569 \* Refer to Rust's [platform support page][forge-platform-support] for more
1570 information on Rust's tiered platform support.
1574 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1578 - [`BTreeMap::get_key_value`]
1579 - [`HashMap::get_key_value`]
1580 - [`Option::as_deref_mut`]
1581 - [`Option::as_deref`]
1582 - [`Option::flatten`]
1583 - [`UdpSocket::peer_addr`]
1584 - [`f32::to_be_bytes`]
1585 - [`f32::to_le_bytes`]
1586 - [`f32::to_ne_bytes`]
1587 - [`f64::to_be_bytes`]
1588 - [`f64::to_le_bytes`]
1589 - [`f64::to_ne_bytes`]
1590 - [`f32::from_be_bytes`]
1591 - [`f32::from_le_bytes`]
1592 - [`f32::from_ne_bytes`]
1593 - [`f64::from_be_bytes`]
1594 - [`f64::from_le_bytes`]
1595 - [`f64::from_ne_bytes`]
1602 - [Cargo will now always display warnings, rather than only on
1603 fresh builds.][cargo/7450]
1604 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1605 now produce an error.][cargo/7507] Previously these flags were ignored.
1606 - [You can now publish `dev-dependencies` without including
1607 a `version`.][cargo/7333]
1611 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1612 when running documentation tests with `rustdoc`.][63803]
1616 - [As previously announced, any previous NLL warnings in the 2015 edition are
1617 now hard errors.][64221]
1618 - [The `include!` macro will now warn if it failed to include the
1619 entire file.][64284] The `include!` macro unintentionally only includes the
1620 first _expression_ in a file, and this can be unintuitive. This will become
1621 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1622 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1623 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1624 or `extern` blocks now correctly emits a hard error.
1626 [65294]: https://github.com/rust-lang/rust/pull/65294/
1627 [66103]: https://github.com/rust-lang/rust/pull/66103/
1628 [65843]: https://github.com/rust-lang/rust/pull/65843/
1629 [65188]: https://github.com/rust-lang/rust/pull/65188/
1630 [65092]: https://github.com/rust-lang/rust/pull/65092/
1631 [64589]: https://github.com/rust-lang/rust/pull/64589/
1632 [64639]: https://github.com/rust-lang/rust/pull/64639/
1633 [64221]: https://github.com/rust-lang/rust/pull/64221/
1634 [64284]: https://github.com/rust-lang/rust/pull/64284/
1635 [63931]: https://github.com/rust-lang/rust/pull/63931/
1636 [64035]: https://github.com/rust-lang/rust/pull/64035/
1637 [63674]: https://github.com/rust-lang/rust/pull/63674/
1638 [63803]: https://github.com/rust-lang/rust/pull/63803/
1639 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1640 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1641 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1642 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1643 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1644 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1645 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1646 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1647 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1648 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1649 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1650 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1651 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1652 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1653 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1654 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1655 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1656 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1657 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1658 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1659 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1660 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1661 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1662 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1663 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1664 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1667 Version 1.39.0 (2019-11-07)
1668 ===========================
1672 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1673 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1674 - [You can now use certain attributes on function, closure, and function pointer
1675 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1676 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1677 attributes applied to items. e.g.
1680 #[cfg(windows)] slice: &[u16],
1681 #[cfg(not(windows))] slice: &[u8],
1686 - [You can now take shared references to bind-by-move patterns in the `if` guards
1687 of `match` arms.][63118] e.g.
1690 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1694 // ---- `nums` is bound by move.
1695 if nums.iter().sum::<u8>() == 10
1696 // ^------ `.iter()` implicitly takes a reference to `nums`.
1699 // ----------- Legal as `nums` was bound by move and so we have ownership.
1701 _ => unreachable!(),
1710 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1711 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1712 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1713 **Note** Cargo currently doesn't use this feature. Refer to
1714 [cargo#7315][cargo/7315] to track this feature's progress.
1715 - [You can now pass `--show-output` argument to test binaries to print the
1716 output of successful tests.][62600]
1719 \* Refer to Rust's [platform support page][forge-platform-support] for more
1720 information on Rust's tiered platform support.
1724 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1725 - [`LinkedList::new` is now a `const` function.][63684]
1726 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1727 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1728 now `const`.][63786]
1732 - [`Pin::into_inner`]
1733 - [`Instant::checked_duration_since`]
1734 - [`Instant::saturating_duration_since`]
1738 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1739 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1740 `--all` is now deprecated.
1744 - [You can now pass `-Clinker` to rustdoc to control the linker used
1745 for compiling doctests.][63834]
1749 - [Code that was previously accepted by the old borrow checker, but rejected by
1750 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1751 previously a warning, and will also become a hard error in the Rust 2015
1752 edition in the 1.40.0 release.
1753 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1754 run tests.][63827] This should improve performance when running a large
1756 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1757 recommended to use the `?` operator instead.
1758 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1761 [62600]: https://github.com/rust-lang/rust/pull/62600/
1762 [62672]: https://github.com/rust-lang/rust/pull/62672/
1763 [63118]: https://github.com/rust-lang/rust/pull/63118/
1764 [63209]: https://github.com/rust-lang/rust/pull/63209/
1765 [63402]: https://github.com/rust-lang/rust/pull/63402/
1766 [63565]: https://github.com/rust-lang/rust/pull/63565/
1767 [63595]: https://github.com/rust-lang/rust/pull/63595/
1768 [63684]: https://github.com/rust-lang/rust/pull/63684/
1769 [63698]: https://github.com/rust-lang/rust/pull/63698/
1770 [63770]: https://github.com/rust-lang/rust/pull/63770/
1771 [63786]: https://github.com/rust-lang/rust/pull/63786/
1772 [63827]: https://github.com/rust-lang/rust/pull/63827/
1773 [63834]: https://github.com/rust-lang/rust/pull/63834/
1774 [63927]: https://github.com/rust-lang/rust/pull/63927/
1775 [63933]: https://github.com/rust-lang/rust/pull/63933/
1776 [63934]: https://github.com/rust-lang/rust/pull/63934/
1777 [63938]: https://github.com/rust-lang/rust/pull/63938/
1778 [63940]: https://github.com/rust-lang/rust/pull/63940/
1779 [63941]: https://github.com/rust-lang/rust/pull/63941/
1780 [63945]: https://github.com/rust-lang/rust/pull/63945/
1781 [64010]: https://github.com/rust-lang/rust/pull/64010/
1782 [64028]: https://github.com/rust-lang/rust/pull/64028/
1783 [64334]: https://github.com/rust-lang/rust/pull/64334/
1784 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1785 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1786 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1787 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1788 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1789 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1791 Version 1.38.0 (2019-09-26)
1792 ==========================
1796 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1797 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1801 - [Added pipelined compilation support to `rustc`.][62766] This will
1802 improve compilation times in some cases. For further information please refer
1803 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1804 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1805 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1806 `x86_64-uwp-windows-msvc` targets.][60260]
1807 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1808 `armv7-unknown-linux-musleabi` targets.][63107]
1809 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1810 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1811 - [Upgraded to LLVM 9.][62592]
1813 \* Refer to Rust's [platform support page][forge-platform-support] for more
1814 information on Rust's tiered platform support.
1818 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1819 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1820 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1821 is available at `std::clone::Clone`). This also makes all built-in macros
1822 available in `std`/`core` root. e.g. `std::include_bytes!`.
1823 - [`str::Chars` now implements `Debug`.][63000]
1824 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1825 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1826 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1827 - [Added euclidean remainder and division operations (`div_euclid`,
1828 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1829 `overflowing`, and `wrapping` versions are available for all
1831 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1832 `PartialEq`.][61491]
1833 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1837 - [`<*const T>::cast`]
1838 - [`<*mut T>::cast`]
1839 - [`Duration::as_secs_f32`]
1840 - [`Duration::as_secs_f64`]
1841 - [`Duration::div_f32`]
1842 - [`Duration::div_f64`]
1843 - [`Duration::from_secs_f32`]
1844 - [`Duration::from_secs_f64`]
1845 - [`Duration::mul_f32`]
1846 - [`Duration::mul_f64`]
1847 - [`any::type_name`]
1851 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1852 - [You can now pass the `--features` option multiple times to enable
1853 multiple features.][cargo/7084]
1857 - [`rustc` will now warn about some incorrect uses of
1858 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1862 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1864 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1865 issues][62896] with certain crates such as libc.
1867 [60260]: https://github.com/rust-lang/rust/pull/60260/
1868 [61457]: https://github.com/rust-lang/rust/pull/61457/
1869 [61491]: https://github.com/rust-lang/rust/pull/61491/
1870 [61884]: https://github.com/rust-lang/rust/pull/61884/
1871 [61953]: https://github.com/rust-lang/rust/pull/61953/
1872 [62042]: https://github.com/rust-lang/rust/pull/62042/
1873 [62528]: https://github.com/rust-lang/rust/pull/62528/
1874 [62583]: https://github.com/rust-lang/rust/pull/62583/
1875 [62735]: https://github.com/rust-lang/rust/pull/62735/
1876 [62766]: https://github.com/rust-lang/rust/pull/62766/
1877 [62784]: https://github.com/rust-lang/rust/pull/62784/
1878 [62592]: https://github.com/rust-lang/rust/pull/62592/
1879 [62785]: https://github.com/rust-lang/rust/issues/62785/
1880 [62814]: https://github.com/rust-lang/rust/pull/62814/
1881 [62896]: https://github.com/rust-lang/rust/issues/62896/
1882 [63000]: https://github.com/rust-lang/rust/pull/63000/
1883 [63056]: https://github.com/rust-lang/rust/pull/63056/
1884 [63107]: https://github.com/rust-lang/rust/pull/63107/
1885 [63346]: https://github.com/rust-lang/rust/pull/63346/
1886 [63421]: https://github.com/rust-lang/rust/pull/63421/
1887 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1888 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1889 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1890 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1891 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1892 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1893 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1894 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1895 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1896 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1897 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1898 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1899 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1900 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1901 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1903 Version 1.37.0 (2019-08-15)
1904 ==========================
1908 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1909 [`Box`][62228], or an [array][62235] and unused.
1910 - [You can now use the `cfg` and `cfg_attr` attributes on
1911 generic parameters.][61547]
1912 - [You can now use enum variants through type alias.][61682] e.g. You can
1913 write the following:
1915 type MyOption = Option<u8>;
1917 fn increment_or_zero(x: MyOption) -> u8 {
1919 MyOption::Some(y) => y + 1,
1920 MyOption::None => 0,
1924 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1925 `const _: u32 = 5;`.
1926 - [You can now use `#[repr(align(X)]` on enums.][61229]
1927 - [The `?` Kleene macro operator is now available in the
1928 2015 edition.][60932]
1932 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1933 and `-C profile-use` flags.][61268] For more information on how to use profile
1934 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1935 - [The `rust-lldb` wrapper script should now work again.][61827]
1939 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1943 - [`BufReader::buffer`]
1944 - [`BufWriter::buffer`]
1945 - [`Cell::from_mut`]
1946 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1947 - [`DoubleEndedIterator::nth_back`]
1949 - [`Wrapping::reverse_bits`]
1950 - [`i128::reverse_bits`]
1951 - [`i16::reverse_bits`]
1952 - [`i32::reverse_bits`]
1953 - [`i64::reverse_bits`]
1954 - [`i8::reverse_bits`]
1955 - [`isize::reverse_bits`]
1956 - [`slice::copy_within`]
1957 - [`u128::reverse_bits`]
1958 - [`u16::reverse_bits`]
1959 - [`u32::reverse_bits`]
1960 - [`u64::reverse_bits`]
1961 - [`u8::reverse_bits`]
1962 - [`usize::reverse_bits`]
1966 - [`Cargo.lock` files are now included by default when publishing executable crates
1967 with executables.][cargo/7026]
1968 - [You can now specify `default-run="foo"` in `[package]` to specify the
1969 default executable to use for `cargo run`.][cargo/7056]
1976 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1977 Please transition your code to using the `..=` syntax for inclusive
1979 - [Using a trait object without the `dyn` will now warn by default.][61203]
1980 Please transition your code to use `dyn Trait` for trait objects instead.
1982 [62228]: https://github.com/rust-lang/rust/pull/62228/
1983 [62235]: https://github.com/rust-lang/rust/pull/62235/
1984 [61802]: https://github.com/rust-lang/rust/pull/61802/
1985 [61827]: https://github.com/rust-lang/rust/pull/61827/
1986 [61547]: https://github.com/rust-lang/rust/pull/61547/
1987 [61682]: https://github.com/rust-lang/rust/pull/61682/
1988 [61268]: https://github.com/rust-lang/rust/pull/61268/
1989 [61342]: https://github.com/rust-lang/rust/pull/61342/
1990 [61347]: https://github.com/rust-lang/rust/pull/61347/
1991 [61100]: https://github.com/rust-lang/rust/pull/61100/
1992 [61203]: https://github.com/rust-lang/rust/pull/61203/
1993 [61229]: https://github.com/rust-lang/rust/pull/61229/
1994 [60932]: https://github.com/rust-lang/rust/pull/60932/
1995 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1996 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1997 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1998 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1999 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2000 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2001 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2002 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2003 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2004 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2005 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2006 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2007 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2008 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2009 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2010 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2011 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2012 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2013 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2014 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2015 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2016 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2017 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2018 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2021 Version 1.36.0 (2019-07-04)
2022 ==========================
2026 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2027 - [The order of traits in trait objects no longer affects the semantics of that
2028 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2029 `dyn fmt::Debug + Send`, where this was previously not the case.
2033 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2034 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2035 - [`mem::needs_drop` is now available as a const fn.][60364]
2036 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2037 - [`String` now implements `BorrowMut<str>`.][60404]
2038 - [`io::Cursor` now implements `Default`.][60234]
2039 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2040 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2041 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2042 environment has access to heap memory allocation.
2043 - [`String` now implements `From<&String>`.][59825]
2044 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2045 return a tuple of each argument when there is multiple arguments.
2046 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2051 - [`VecDeque::rotate_left`]
2052 - [`VecDeque::rotate_right`]
2053 - [`Iterator::copied`]
2055 - [`io::IoSliceMut`]
2056 - [`Read::read_vectored`]
2057 - [`Write::write_vectored`]
2058 - [`str::as_mut_ptr`]
2059 - [`mem::MaybeUninit`]
2060 - [`pointer::align_offset`]
2061 - [`future::Future`]
2063 - [`task::RawWaker`]
2064 - [`task::RawWakerVTable`]
2070 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2071 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2073 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2077 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2084 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2085 longer recommended, and will be deprecated in 1.39.0.
2087 [60318]: https://github.com/rust-lang/rust/pull/60318/
2088 [60364]: https://github.com/rust-lang/rust/pull/60364/
2089 [60370]: https://github.com/rust-lang/rust/pull/60370/
2090 [60404]: https://github.com/rust-lang/rust/pull/60404/
2091 [60234]: https://github.com/rust-lang/rust/pull/60234/
2092 [60244]: https://github.com/rust-lang/rust/pull/60244/
2093 [58623]: https://github.com/rust-lang/rust/pull/58623/
2094 [59648]: https://github.com/rust-lang/rust/pull/59648/
2095 [59675]: https://github.com/rust-lang/rust/pull/59675/
2096 [59825]: https://github.com/rust-lang/rust/pull/59825/
2097 [59826]: https://github.com/rust-lang/rust/pull/59826/
2098 [59445]: https://github.com/rust-lang/rust/pull/59445/
2099 [59114]: https://github.com/rust-lang/rust/pull/59114/
2100 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2101 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2102 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2103 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2104 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2105 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2106 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2107 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2108 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2109 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2110 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2111 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2112 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2113 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2114 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2115 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2116 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2117 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2118 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2119 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2122 Version 1.35.0 (2019-05-23)
2123 ==========================
2127 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2128 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2129 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2131 unsafe fn call_unsafe(func: unsafe fn()) {
2136 unsafe { call_unsafe(|| {}); }
2143 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2144 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2145 - [Added the `wasm32-unknown-wasi` target.][59464]
2150 - [`Thread` will now show its ID in `Debug` output.][59460]
2151 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2152 - [`alloc::System` now implements `Default`.][59451]
2153 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2155 - [`char::{ToLowercase, ToUppercase}` now
2156 implement `ExactSizeIterator`.][58778]
2157 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2158 - [Removed the `Read` trait bounds
2159 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2160 - [You can now call the `dbg!` macro without any parameters to print the file
2161 and line where it is called.][57847]
2162 - [In place ASCII case conversions are now up to 4× faster.][59283]
2163 e.g. `str::make_ascii_lowercase`
2164 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2171 - [`RefCell::replace_with`]
2172 - [`RefCell::map_split`]
2174 - [`Range::contains`]
2175 - [`RangeFrom::contains`]
2176 - [`RangeTo::contains`]
2177 - [`RangeInclusive::contains`]
2178 - [`RangeToInclusive::contains`]
2179 - [`Option::copied`]
2183 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2184 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2189 - [The Rust toolchain is now available natively for musl based distros.][58575]
2191 [59460]: https://github.com/rust-lang/rust/pull/59460/
2192 [59464]: https://github.com/rust-lang/rust/pull/59464/
2193 [59500]: https://github.com/rust-lang/rust/pull/59500/
2194 [59512]: https://github.com/rust-lang/rust/pull/59512/
2195 [59580]: https://github.com/rust-lang/rust/pull/59580/
2196 [59283]: https://github.com/rust-lang/rust/pull/59283/
2197 [59451]: https://github.com/rust-lang/rust/pull/59451/
2198 [59076]: https://github.com/rust-lang/rust/pull/59076/
2199 [58778]: https://github.com/rust-lang/rust/pull/58778/
2200 [58717]: https://github.com/rust-lang/rust/pull/58717/
2201 [58369]: https://github.com/rust-lang/rust/pull/58369/
2202 [58423]: https://github.com/rust-lang/rust/pull/58423/
2203 [58080]: https://github.com/rust-lang/rust/pull/58080/
2204 [57847]: https://github.com/rust-lang/rust/pull/57847/
2205 [58575]: https://github.com/rust-lang/rust/pull/58575
2206 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2207 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2208 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2209 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2210 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2211 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2212 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2213 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2214 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2215 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2216 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2217 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2219 Version 1.34.2 (2019-05-14)
2220 ===========================
2222 * [Destabilize the `Error::type_id` function due to a security
2223 vulnerability][60785] ([CVE-2019-12083])
2225 [60785]: https://github.com/rust-lang/rust/pull/60785
2226 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2228 Version 1.34.1 (2019-04-25)
2229 ===========================
2231 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2232 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2233 * [Fix Clippy panic when checking some macros][clippy/3805]
2235 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2236 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2237 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2239 Version 1.34.0 (2019-04-11)
2240 ==========================
2244 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2245 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2247 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2248 `#[attr{}]` procedural macros.][57367]
2249 - [You can now write `extern crate self as foo;`][57407] to import your
2250 crate's root into the extern prelude.
2255 - [You can now target `riscv64imac-unknown-none-elf` and
2256 `riscv64gc-unknown-none-elf`.][58406]
2257 - [You can now enable linker plugin LTO optimisations with
2258 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2259 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2261 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2266 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2267 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2268 the `Hash` trait to create an iterator.
2269 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2270 methods.][58421] Most notably you no longer require the `Ord` trait to create
2272 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2273 for all numeric types.][58044]
2274 - [Indexing a `str` is now generic over all types that
2275 implement `SliceIndex<str>`.][57604]
2276 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2277 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2278 produce a warning if their returning type is unused.
2279 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2280 `overflowing_pow` are now available for all numeric types.][57873] These are
2281 equivalent to methods such as `wrapping_add` for the `pow` operation.
2289 * [`Error::type_id`]
2290 * [`atomic::AtomicI16`]
2291 * [`atomic::AtomicI32`]
2292 * [`atomic::AtomicI64`]
2293 * [`atomic::AtomicI8`]
2294 * [`atomic::AtomicU16`]
2295 * [`atomic::AtomicU32`]
2296 * [`atomic::AtomicU64`]
2297 * [`atomic::AtomicU8`]
2298 * [`convert::Infallible`]
2299 * [`convert::TryFrom`]
2300 * [`convert::TryInto`]
2302 * [`iter::successors`]
2303 * [`num::NonZeroI128`]
2304 * [`num::NonZeroI16`]
2305 * [`num::NonZeroI32`]
2306 * [`num::NonZeroI64`]
2307 * [`num::NonZeroI8`]
2308 * [`num::NonZeroIsize`]
2309 * [`slice::sort_by_cached_key`]
2310 * [`str::escape_debug`]
2311 * [`str::escape_default`]
2312 * [`str::escape_unicode`]
2313 * [`str::split_ascii_whitespace`]
2316 * [`Instant::checked_add`]
2317 * [`Instant::checked_sub`]
2318 * [`SystemTime::checked_add`]
2319 * [`SystemTime::checked_sub`]
2323 - [You can now use alternative registries to crates.io.][cargo/6654]
2327 - [You can now use the `?` operator in your documentation tests without manually
2328 adding `fn main() -> Result<(), _> {}`.][56470]
2332 - [`Command::before_exec` is being replaced by the unsafe method
2333 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2334 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2335 can now use `const` functions in `static` variables.
2337 [58370]: https://github.com/rust-lang/rust/pull/58370/
2338 [58406]: https://github.com/rust-lang/rust/pull/58406/
2339 [58421]: https://github.com/rust-lang/rust/pull/58421/
2340 [58166]: https://github.com/rust-lang/rust/pull/58166/
2341 [58044]: https://github.com/rust-lang/rust/pull/58044/
2342 [58057]: https://github.com/rust-lang/rust/pull/58057/
2343 [58059]: https://github.com/rust-lang/rust/pull/58059/
2344 [57809]: https://github.com/rust-lang/rust/pull/57809/
2345 [57873]: https://github.com/rust-lang/rust/pull/57873/
2346 [57604]: https://github.com/rust-lang/rust/pull/57604/
2347 [57367]: https://github.com/rust-lang/rust/pull/57367/
2348 [57407]: https://github.com/rust-lang/rust/pull/57407/
2349 [57425]: https://github.com/rust-lang/rust/pull/57425/
2350 [57106]: https://github.com/rust-lang/rust/pull/57106/
2351 [56470]: https://github.com/rust-lang/rust/pull/56470/
2352 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2353 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2354 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2355 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2356 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2357 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2358 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2359 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2360 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2361 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2362 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2363 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2364 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2365 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2366 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2367 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2368 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2369 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2370 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2371 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2372 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2373 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2374 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2375 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2376 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2377 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2378 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2379 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2380 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2381 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2382 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2385 Version 1.33.0 (2019-02-28)
2386 ==========================
2390 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2391 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2392 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2393 E.g. You can have match statement on a `u8` that covers `0..=255` and
2394 you would no longer be required to have a `_ => unreachable!()` case.
2395 - [You can now have multiple patterns in `if let` and `while let`
2396 expressions.][57532] You can do this with the same syntax as a `match`
2406 let state = Creature::Crab("Ferris");
2408 if let Creature::Crab(name) | Creature::Person(name) = state {
2409 println!("This creature's name is: {}", name);
2413 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2414 this feature will by default produce a warning as this behaviour can be
2415 unintuitive. E.g. `if let _ = 5 {}`
2416 - [You can now use `let` bindings, assignments, expression statements,
2417 and irrefutable pattern destructuring in const functions.][57175]
2418 - [You can now call unsafe const functions.][57067] E.g.
2420 const unsafe fn foo() -> i32 { 5 }
2421 const fn bar() -> i32 {
2425 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2426 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2427 - [You can now specify a specific alignment with the `#[repr(packed)]`
2428 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2429 with an alignment of 2 bytes and a size of 6 bytes.
2430 - [You can now import an item from a module as an `_`.][56303] This allows you to
2431 import a trait's impls, and not have the name in the namespace. E.g.
2433 use std::io::Read as _;
2435 // Allowed as there is only one `Read` in the module.
2438 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2442 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2443 command line argument.][56351]
2444 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2445 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2446 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2447 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2448 information on Rust's platform support.
2449 - [Added support for the `thumbv7neon-linux-androideabi` and
2450 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2451 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2455 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2456 functions for all numeric types.][57566]
2457 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2458 are now `const` functions for all numeric types.][57105]
2459 - [The methods `is_positive` and `is_negative` are now `const` functions for
2460 all signed numeric types.][57105]
2461 - [The `get` method for all `NonZero` types is now `const`.][57167]
2462 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2463 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2464 numeric types.][57234]
2465 - [`Ipv4Addr::new` is now a `const` function][57234]
2469 - [`unix::FileExt::read_exact_at`]
2470 - [`unix::FileExt::write_all_at`]
2471 - [`Option::transpose`]
2472 - [`Result::transpose`]
2473 - [`convert::identity`]
2476 - [`marker::PhantomPinned`]
2477 - [`Vec::resize_with`]
2478 - [`VecDeque::resize_with`]
2479 - [`Duration::as_millis`]
2480 - [`Duration::as_micros`]
2481 - [`Duration::as_nanos`]
2486 - [You can now publish crates that require a feature flag to compile with
2487 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2488 - [Cargo should now rebuild a crate if a file was modified during the initial
2493 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2494 are now deprecated in the standard library, and their usage will now produce a warning.
2495 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2497 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2499 - [Libtest no longer creates a new thread for each test when
2500 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2502 [55982]: https://github.com/rust-lang/rust/pull/55982/
2503 [56243]: https://github.com/rust-lang/rust/pull/56243
2504 [56303]: https://github.com/rust-lang/rust/pull/56303/
2505 [56351]: https://github.com/rust-lang/rust/pull/56351/
2506 [56362]: https://github.com/rust-lang/rust/pull/56362
2507 [56642]: https://github.com/rust-lang/rust/pull/56642/
2508 [56769]: https://github.com/rust-lang/rust/pull/56769/
2509 [56805]: https://github.com/rust-lang/rust/pull/56805
2510 [56947]: https://github.com/rust-lang/rust/pull/56947/
2511 [57049]: https://github.com/rust-lang/rust/pull/57049/
2512 [57067]: https://github.com/rust-lang/rust/pull/57067/
2513 [57105]: https://github.com/rust-lang/rust/pull/57105
2514 [57130]: https://github.com/rust-lang/rust/pull/57130/
2515 [57167]: https://github.com/rust-lang/rust/pull/57167/
2516 [57175]: https://github.com/rust-lang/rust/pull/57175/
2517 [57234]: https://github.com/rust-lang/rust/pull/57234/
2518 [57332]: https://github.com/rust-lang/rust/pull/57332/
2519 [57465]: https://github.com/rust-lang/rust/pull/57465/
2520 [57532]: https://github.com/rust-lang/rust/pull/57532/
2521 [57535]: https://github.com/rust-lang/rust/pull/57535/
2522 [57566]: https://github.com/rust-lang/rust/pull/57566/
2523 [57615]: https://github.com/rust-lang/rust/pull/57615/
2524 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2525 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2526 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2527 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2528 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2529 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2530 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2531 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2532 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2533 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2534 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2535 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2536 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2537 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2538 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2539 [platform-support]: https://forge.rust-lang.org/platform-support.html
2541 Version 1.32.0 (2019-01-17)
2542 ==========================
2547 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2548 operator allows you to specify zero or one repetitions similar to the `*` and
2550 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2551 now always resolve to the item (`enum`, `struct`, etc.) available in the
2552 module if present, before resolving to a external crate or an item the prelude.][56759]
2555 enum Color { Red, Green, Blue }
2561 - [You can now match against `PhantomData<T>` types.][55837]
2562 - [You can now match against literals in macros with the `literal`
2563 specifier.][56072] This will match against a literal of any type.
2564 E.g. `1`, `'A'`, `"Hello World"`
2565 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2567 struct Point(i32, i32);
2570 pub fn new(x: i32, y: i32) -> Self {
2574 pub fn is_origin(&self) -> bool {
2582 - [Self can also now be used in type definitions.][56366] E.g.
2586 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2589 Cons(T, Box<Self>) // likewise here
2592 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2593 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2597 - [The default allocator has changed from jemalloc to the default allocator on
2598 your system.][55238] The compiler itself on Linux & macOS will still use
2599 jemalloc, but programs compiled with it will use the system allocator.
2600 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2604 - [`PathBuf` now implements `FromStr`.][55148]
2605 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2606 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2607 easily debug expressions in your rust program. E.g.
2610 let b = dbg!(a * 2) + 1;
2611 // ^-- prints: [src/main.rs:4] a * 2 = 4
2615 The following APIs are now `const` functions and can be used in a
2619 - [`UnsafeCell::get`]
2620 - [`char::is_ascii`]
2622 - [`ManuallyDrop::new`]
2623 - [`ManuallyDrop::into_inner`]
2624 - [`RangeInclusive::start`]
2625 - [`RangeInclusive::end`]
2626 - [`NonNull::as_ptr`]
2629 - [`Duration::as_secs`]
2630 - [`Duration::subsec_millis`]
2631 - [`Duration::subsec_micros`]
2632 - [`Duration::subsec_nanos`]
2634 - [`Ipv4Addr::is_unspecified`]
2636 - [`Ipv6Addr::octets`]
2640 - [`i8::to_be_bytes`]
2641 - [`i8::to_le_bytes`]
2642 - [`i8::to_ne_bytes`]
2643 - [`i8::from_be_bytes`]
2644 - [`i8::from_le_bytes`]
2645 - [`i8::from_ne_bytes`]
2646 - [`i16::to_be_bytes`]
2647 - [`i16::to_le_bytes`]
2648 - [`i16::to_ne_bytes`]
2649 - [`i16::from_be_bytes`]
2650 - [`i16::from_le_bytes`]
2651 - [`i16::from_ne_bytes`]
2652 - [`i32::to_be_bytes`]
2653 - [`i32::to_le_bytes`]
2654 - [`i32::to_ne_bytes`]
2655 - [`i32::from_be_bytes`]
2656 - [`i32::from_le_bytes`]
2657 - [`i32::from_ne_bytes`]
2658 - [`i64::to_be_bytes`]
2659 - [`i64::to_le_bytes`]
2660 - [`i64::to_ne_bytes`]
2661 - [`i64::from_be_bytes`]
2662 - [`i64::from_le_bytes`]
2663 - [`i64::from_ne_bytes`]
2664 - [`i128::to_be_bytes`]
2665 - [`i128::to_le_bytes`]
2666 - [`i128::to_ne_bytes`]
2667 - [`i128::from_be_bytes`]
2668 - [`i128::from_le_bytes`]
2669 - [`i128::from_ne_bytes`]
2670 - [`isize::to_be_bytes`]
2671 - [`isize::to_le_bytes`]
2672 - [`isize::to_ne_bytes`]
2673 - [`isize::from_be_bytes`]
2674 - [`isize::from_le_bytes`]
2675 - [`isize::from_ne_bytes`]
2676 - [`u8::to_be_bytes`]
2677 - [`u8::to_le_bytes`]
2678 - [`u8::to_ne_bytes`]
2679 - [`u8::from_be_bytes`]
2680 - [`u8::from_le_bytes`]
2681 - [`u8::from_ne_bytes`]
2682 - [`u16::to_be_bytes`]
2683 - [`u16::to_le_bytes`]
2684 - [`u16::to_ne_bytes`]
2685 - [`u16::from_be_bytes`]
2686 - [`u16::from_le_bytes`]
2687 - [`u16::from_ne_bytes`]
2688 - [`u32::to_be_bytes`]
2689 - [`u32::to_le_bytes`]
2690 - [`u32::to_ne_bytes`]
2691 - [`u32::from_be_bytes`]
2692 - [`u32::from_le_bytes`]
2693 - [`u32::from_ne_bytes`]
2694 - [`u64::to_be_bytes`]
2695 - [`u64::to_le_bytes`]
2696 - [`u64::to_ne_bytes`]
2697 - [`u64::from_be_bytes`]
2698 - [`u64::from_le_bytes`]
2699 - [`u64::from_ne_bytes`]
2700 - [`u128::to_be_bytes`]
2701 - [`u128::to_le_bytes`]
2702 - [`u128::to_ne_bytes`]
2703 - [`u128::from_be_bytes`]
2704 - [`u128::from_le_bytes`]
2705 - [`u128::from_ne_bytes`]
2706 - [`usize::to_be_bytes`]
2707 - [`usize::to_le_bytes`]
2708 - [`usize::to_ne_bytes`]
2709 - [`usize::from_be_bytes`]
2710 - [`usize::from_le_bytes`]
2711 - [`usize::from_ne_bytes`]
2715 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2716 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2720 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2724 - [The argument types for AVX's
2725 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2726 been changed from `*const` to `*mut` as the previous implementation
2730 [55148]: https://github.com/rust-lang/rust/pull/55148/
2731 [55238]: https://github.com/rust-lang/rust/pull/55238/
2732 [55280]: https://github.com/rust-lang/rust/pull/55280/
2733 [55610]: https://github.com/rust-lang/rust/pull/55610/
2734 [55663]: https://github.com/rust-lang/rust/pull/55663/
2735 [55702]: https://github.com/rust-lang/rust/pull/55702/
2736 [55837]: https://github.com/rust-lang/rust/pull/55837/
2737 [55843]: https://github.com/rust-lang/rust/pull/55843/
2738 [56072]: https://github.com/rust-lang/rust/pull/56072/
2739 [56245]: https://github.com/rust-lang/rust/pull/56245/
2740 [56365]: https://github.com/rust-lang/rust/pull/56365/
2741 [56366]: https://github.com/rust-lang/rust/pull/56366/
2742 [56395]: https://github.com/rust-lang/rust/pull/56395/
2743 [56759]: https://github.com/rust-lang/rust/pull/56759/
2744 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2745 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2746 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2747 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2748 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2749 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2750 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2751 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2752 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2753 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2754 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2755 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2756 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2757 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2758 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2759 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2760 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2761 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2762 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2763 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2764 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2765 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2766 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2767 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2768 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2769 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2770 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2771 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2772 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2773 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2774 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2775 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2776 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2777 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2778 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2779 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2780 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2781 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2782 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2783 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2784 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2785 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2786 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2787 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2788 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2789 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2790 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2791 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2792 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2793 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2794 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2795 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2796 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2797 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2798 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2799 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2800 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2801 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2802 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2803 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2804 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2805 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2806 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2807 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2808 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2809 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2810 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2811 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2812 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2813 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2814 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2815 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2816 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2817 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2818 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2819 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2820 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2821 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2822 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2823 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2824 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2825 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2826 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2827 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2828 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2829 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2830 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2831 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2832 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2833 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2834 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2835 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2836 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2839 Version 1.31.1 (2018-12-20)
2840 ===========================
2842 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2843 - [Fix broken go-to-definition in RLS][rls/1171]
2844 - [Fix infinite loop on hover in RLS][rls/1170]
2846 [56562]: https://github.com/rust-lang/rust/pull/56562
2847 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2848 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2850 Version 1.31.0 (2018-12-06)
2851 ==========================
2855 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2856 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2857 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2858 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2860 - [You can now define and use `const` functions.][54835] These are currently
2861 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2862 [language reference][const-reference] for what exactly is available.
2863 - [You can now use tool lints, which allow you to scope lints from external
2864 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2865 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2866 a crate, not just in exported functions.][54451]
2867 - [You can now use parentheses in pattern matches.][54497]
2871 - [Updated musl to 1.1.20][54430]
2875 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2876 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2877 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2878 into `Option<&mut T>` using the `From` trait.][53218]
2879 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2884 - [`slice::align_to`]
2885 - [`slice::align_to_mut`]
2886 - [`slice::chunks_exact`]
2887 - [`slice::chunks_exact_mut`]
2888 - [`slice::rchunks`]
2889 - [`slice::rchunks_mut`]
2890 - [`slice::rchunks_exact`]
2891 - [`slice::rchunks_exact_mut`]
2892 - [`Option::replace`]
2896 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2897 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2898 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2900 [52813]: https://github.com/rust-lang/rust/pull/52813/
2901 [53218]: https://github.com/rust-lang/rust/pull/53218/
2902 [53555]: https://github.com/rust-lang/rust/issues/53555/
2903 [54057]: https://github.com/rust-lang/rust/pull/54057/
2904 [54240]: https://github.com/rust-lang/rust/pull/54240/
2905 [54430]: https://github.com/rust-lang/rust/pull/54430/
2906 [54451]: https://github.com/rust-lang/rust/pull/54451/
2907 [54497]: https://github.com/rust-lang/rust/pull/54497/
2908 [54778]: https://github.com/rust-lang/rust/pull/54778/
2909 [54835]: https://github.com/rust-lang/rust/pull/54835/
2910 [54870]: https://github.com/rust-lang/rust/pull/54870/
2911 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2912 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2913 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2914 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2915 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2916 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2917 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2918 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2919 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2920 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2921 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2922 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2923 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2924 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2926 Version 1.30.1 (2018-11-08)
2927 ===========================
2929 - [Fixed overflow ICE in rustdoc][54199]
2930 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2932 [54199]: https://github.com/rust-lang/rust/pull/54199
2933 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2935 Version 1.30.0 (2018-10-25)
2936 ==========================
2940 - [Procedural macros are now available.][52081] These kinds of macros allow for
2941 more powerful code generation. There is a [new chapter available][proc-macros]
2942 in the Rust Programming Language book that goes further in depth.
2943 - [You can now use keywords as identifiers using the raw identifiers
2944 syntax (`r#`),][53236] e.g. `let r#for = true;`
2945 - [Using anonymous parameters in traits is now deprecated with a warning and
2946 will be a hard error in the 2018 edition.][53272]
2947 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2948 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2949 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2950 Previously, using a external crate in a module without a use statement
2951 required `let json = ::serde_json::from_str(foo);` but can now be written
2952 as `let json = serde_json::from_str(foo);`.
2953 - [You can now apply the `#[used]` attribute to static items to prevent the
2954 compiler from optimising them away, even if they appear to be unused,][51363]
2955 e.g. `#[used] static FOO: u32 = 1;`
2956 - [You can now import and reexport macros from other crates with the `use`
2957 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2958 the root module of the crate. If your macro relies on calling other local
2959 macros, it is recommended to export with the
2960 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2962 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2963 using the `vis` specifier.][53370]
2964 - [Non-macro attributes now allow all forms of literals, not just
2965 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2966 write `#[attr(true)]`.
2967 - [You can now specify a function to handle a panic in the Rust runtime with the
2968 `#[panic_handler]` attribute.][51366]
2972 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2973 - [Added the `aarch64-unknown-netbsd` target][53165]
2974 - [Upgraded to LLVM 8.][53611]
2978 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2982 - [`Ipv4Addr::BROADCAST`]
2983 - [`Ipv4Addr::LOCALHOST`]
2984 - [`Ipv4Addr::UNSPECIFIED`]
2985 - [`Ipv6Addr::LOCALHOST`]
2986 - [`Ipv6Addr::UNSPECIFIED`]
2987 - [`Iterator::find_map`]
2989 The following methods are replacement methods for `trim_left`, `trim_right`,
2990 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2992 - [`str::trim_end_matches`]
2994 - [`str::trim_start_matches`]
2995 - [`str::trim_start`]
2999 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3000 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3001 equivalent to calling `rustdoc --error-format=json`.
3002 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3006 - [`rustdoc` allows you to specify what edition to treat your code as with the
3007 `--edition` option.][54057]
3008 - [`rustdoc` now has the `--color` (specify whether to output color) and
3009 `--error-format` (specify error format, e.g. `json`) options.][53003]
3010 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3011 debug symbols.][53774]
3012 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3013 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3015 [50911]: https://github.com/rust-lang/rust/pull/50911/
3016 [51363]: https://github.com/rust-lang/rust/pull/51363/
3017 [51366]: https://github.com/rust-lang/rust/pull/51366/
3018 [52081]: https://github.com/rust-lang/rust/pull/52081/
3019 [53003]: https://github.com/rust-lang/rust/pull/53003/
3020 [53033]: https://github.com/rust-lang/rust/pull/53033/
3021 [53044]: https://github.com/rust-lang/rust/pull/53044/
3022 [53165]: https://github.com/rust-lang/rust/pull/53165/
3023 [53611]: https://github.com/rust-lang/rust/pull/53611/
3024 [53213]: https://github.com/rust-lang/rust/pull/53213/
3025 [53236]: https://github.com/rust-lang/rust/pull/53236/
3026 [53272]: https://github.com/rust-lang/rust/pull/53272/
3027 [53370]: https://github.com/rust-lang/rust/pull/53370/
3028 [53459]: https://github.com/rust-lang/rust/pull/53459/
3029 [53774]: https://github.com/rust-lang/rust/pull/53774/
3030 [53822]: https://github.com/rust-lang/rust/pull/53822/
3031 [54057]: https://github.com/rust-lang/rust/pull/54057/
3032 [54146]: https://github.com/rust-lang/rust/pull/54146/
3033 [54404]: https://github.com/rust-lang/rust/pull/54404/
3034 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3035 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3036 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3037 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3039 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3040 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3041 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3042 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3043 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3044 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3045 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3046 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3047 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3048 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3051 Version 1.29.2 (2018-10-11)
3052 ===========================
3054 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3055 - The `rls-preview` component on the windows-gnu targets has been restored.
3057 [54639]: https://github.com/rust-lang/rust/pull/54639
3060 Version 1.29.1 (2018-09-25)
3061 ===========================
3066 - The standard library's `str::repeat` function contained an out of bounds write
3067 caused by an integer overflow. This has been fixed by deterministically
3068 panicking when an overflow happens.
3070 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3074 Version 1.29.0 (2018-09-13)
3075 ==========================
3079 - [Bumped minimum LLVM version to 5.0.][51899]
3080 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3081 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3082 - [Upgraded to LLVM 7.][51966]
3086 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3087 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3088 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3089 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3091 - [`Cell<T>` now allows `T` to be unsized.][50494]
3092 - [`SocketAddr` is now stable on Redox.][52656]
3097 - [`Iterator::flatten`]
3102 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3103 `--locked` to disable this behavior.
3104 - [`cargo-install` will now allow you to cross compile an install
3105 using `--target`.][cargo/5614]
3106 - [Added the `cargo-fix` subcommand to automatically move project code from
3107 2015 edition to 2018.][cargo/5723]
3108 - [`cargo doc` can now optionally document private types using the
3109 `--document-private-items` flag.][cargo/5543]
3113 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3114 the specified level to that level.][52354] For example `--cap-lints warn`
3115 will demote `deny` and `forbid` lints to `warn`.
3116 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3117 fails and `101` if there is a panic.][52197]
3118 - [A preview of clippy has been made available through rustup.][51122]
3119 You can install the preview with `rustup component add clippy-preview`.
3123 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3124 Use `str::get_unchecked(begin..end)` instead.
3125 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3126 Consider using the `home_dir` function from
3127 https://crates.io/crates/dirs instead.
3128 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3129 - [`cfg` attributes and `--cfg` command line flags are now more
3130 strictly validated.][53893]
3132 [53893]: https://github.com/rust-lang/rust/pull/53893/
3133 [52861]: https://github.com/rust-lang/rust/pull/52861/
3134 [51966]: https://github.com/rust-lang/rust/pull/51966/
3135 [52656]: https://github.com/rust-lang/rust/pull/52656/
3136 [52239]: https://github.com/rust-lang/rust/pull/52239/
3137 [52330]: https://github.com/rust-lang/rust/pull/52330/
3138 [52354]: https://github.com/rust-lang/rust/pull/52354/
3139 [52402]: https://github.com/rust-lang/rust/pull/52402/
3140 [52103]: https://github.com/rust-lang/rust/pull/52103/
3141 [52197]: https://github.com/rust-lang/rust/pull/52197/
3142 [51807]: https://github.com/rust-lang/rust/pull/51807/
3143 [51899]: https://github.com/rust-lang/rust/pull/51899/
3144 [51912]: https://github.com/rust-lang/rust/pull/51912/
3145 [51511]: https://github.com/rust-lang/rust/pull/51511/
3146 [51619]: https://github.com/rust-lang/rust/pull/51619/
3147 [51656]: https://github.com/rust-lang/rust/pull/51656/
3148 [51178]: https://github.com/rust-lang/rust/pull/51178/
3149 [51122]: https://github.com/rust-lang/rust/pull/51122
3150 [50494]: https://github.com/rust-lang/rust/pull/50494/
3151 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3152 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3153 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3154 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3155 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3156 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3157 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3160 Version 1.28.0 (2018-08-02)
3161 ===========================
3165 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3166 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3167 the inner type across Foreign Function Interface (FFI) boundaries.
3168 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3169 and can now be used as identifiers.][51196]
3170 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3171 stable.][51241] This will allow users to specify a global allocator for
3173 - [Unit test functions marked with the `#[test]` attribute can now return
3174 `Result<(), E: Debug>` in addition to `()`.][51298]
3175 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3176 allows macros to easily target lifetimes.
3180 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3181 prioritise making smaller binary sizes. `z` is the same as `s` with the
3182 exception that it does not vectorise loops, which typically results in an even
3184 - [The short error format is now stable.][49546] Specified with
3185 `--error-format=short` this option will provide a more compressed output of
3186 rust error messages.
3187 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3188 - [Reduced the number of allocations in the macro parser.][50855] This can
3189 improve compile times of macro heavy crates on average by 5%.
3193 - [Implemented `Default` for `&mut str`.][51306]
3194 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3195 - [Implemented `Extend` for `()`.][50234]
3196 - [The `Debug` implementation of `time::Duration` should now be more easily
3197 human readable.][50364] Previously a `Duration` of one second would printed as
3198 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3199 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3200 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3201 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3202 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3203 for `PathBuf`.][50170]
3204 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3205 and `Wrapping<i128>`.][50465]
3206 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3207 possible.][51050] This can provide up to a 40% speed increase.
3208 - [Improved error messages when using `format!`.][50610]
3212 - [`Iterator::step_by`]
3213 - [`Path::ancestors`]
3214 - [`SystemTime::UNIX_EPOCH`]
3215 - [`alloc::GlobalAlloc`]
3217 - [`alloc::LayoutErr`]
3220 - [`alloc::alloc_zeroed`]
3221 - [`alloc::dealloc`]
3222 - [`alloc::realloc`]
3223 - [`alloc::handle_alloc_error`]
3224 - [`btree_map::Entry::or_default`]
3225 - [`fmt::Alignment`]
3226 - [`hash_map::Entry::or_default`]
3227 - [`iter::repeat_with`]
3228 - [`num::NonZeroUsize`]
3229 - [`num::NonZeroU128`]
3230 - [`num::NonZeroU16`]
3231 - [`num::NonZeroU32`]
3232 - [`num::NonZeroU64`]
3233 - [`num::NonZeroU8`]
3234 - [`ops::RangeBounds`]
3235 - [`slice::SliceIndex`]
3236 - [`slice::from_mut`]
3237 - [`slice::from_ref`]
3238 - [`{Any + Send + Sync}::downcast_mut`]
3239 - [`{Any + Send + Sync}::downcast_ref`]
3240 - [`{Any + Send + Sync}::is`]
3244 - [Cargo will now no longer allow you to publish crates with build scripts that
3245 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3246 considered to be immutable.
3250 - [The `suggestion_applicability` field in `rustc`'s json output is now
3251 stable.][50486] This will allow dev tools to check whether a code suggestion
3252 would apply to them.
3256 - [Rust will consider trait objects with duplicated constraints to be the same
3257 type as without the duplicated constraint.][51276] For example the below code will
3258 now fail to compile.
3263 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3266 impl Trait + Send + Send {
3267 fn test(&self) { println!("two"); }
3271 [49546]: https://github.com/rust-lang/rust/pull/49546/
3272 [50143]: https://github.com/rust-lang/rust/pull/50143/
3273 [50170]: https://github.com/rust-lang/rust/pull/50170/
3274 [50234]: https://github.com/rust-lang/rust/pull/50234/
3275 [50265]: https://github.com/rust-lang/rust/pull/50265/
3276 [50364]: https://github.com/rust-lang/rust/pull/50364/
3277 [50385]: https://github.com/rust-lang/rust/pull/50385/
3278 [50465]: https://github.com/rust-lang/rust/pull/50465/
3279 [50486]: https://github.com/rust-lang/rust/pull/50486/
3280 [50554]: https://github.com/rust-lang/rust/pull/50554/
3281 [50610]: https://github.com/rust-lang/rust/pull/50610/
3282 [50855]: https://github.com/rust-lang/rust/pull/50855/
3283 [51050]: https://github.com/rust-lang/rust/pull/51050/
3284 [51196]: https://github.com/rust-lang/rust/pull/51196/
3285 [51200]: https://github.com/rust-lang/rust/pull/51200/
3286 [51241]: https://github.com/rust-lang/rust/pull/51241/
3287 [51276]: https://github.com/rust-lang/rust/pull/51276/
3288 [51298]: https://github.com/rust-lang/rust/pull/51298/
3289 [51306]: https://github.com/rust-lang/rust/pull/51306/
3290 [51562]: https://github.com/rust-lang/rust/pull/51562/
3291 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3292 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3293 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3294 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3295 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3296 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3297 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3298 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3299 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3300 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3301 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3302 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3303 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3304 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3305 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3306 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3307 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3308 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3309 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3310 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3311 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3312 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3313 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3314 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3315 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3316 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3317 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3318 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3319 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3320 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3322 Version 1.27.2 (2018-07-20)
3323 ===========================
3328 - The borrow checker was fixed to avoid potential unsoundness when using
3329 match ergonomics: [#52213][52213].
3331 [52213]: https://github.com/rust-lang/rust/issues/52213
3333 Version 1.27.1 (2018-07-10)
3334 ===========================
3339 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3340 when running, which enabled executing code as some other user on a
3341 given machine. This release fixes that vulnerability; you can read
3342 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3344 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3349 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3350 match ergonomics: [#51415][51415], [#49534][49534].
3352 [51415]: https://github.com/rust-lang/rust/issues/51415
3353 [49534]: https://github.com/rust-lang/rust/issues/49534
3354 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3355 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3357 Version 1.27.0 (2018-06-21)
3358 ==========================
3362 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3363 be used as an identifier.
3364 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3365 bare `Trait` syntax, and should make it clearer when being used in tandem with
3366 `impl Trait` because it is equivalent to the following syntax:
3367 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3368 `Box<Trait> == Box<dyn Trait>`.
3369 - [Attributes on generic parameters such as types and lifetimes are
3370 now stable.][48851] e.g.
3371 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3372 - [The `#[must_use]` attribute can now also be used on functions as well as
3373 types.][48925] It provides a lint that by default warns users when the
3374 value returned by a function has not been used.
3378 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3382 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3383 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3384 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3385 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3386 the `cfg` attribute.
3387 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3388 std are now available in core.][49896]
3389 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3391 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3392 that the operation isn't done in place.
3393 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3394 the `#[must_use]` attribute][49533] to warn about unused potentially
3395 expensive allocations.
3399 - [`DoubleEndedIterator::rfind`]
3400 - [`DoubleEndedIterator::rfold`]
3401 - [`DoubleEndedIterator::try_rfold`]
3402 - [`Duration::from_micros`]
3403 - [`Duration::from_nanos`]
3404 - [`Duration::subsec_micros`]
3405 - [`Duration::subsec_millis`]
3406 - [`HashMap::remove_entry`]
3407 - [`Iterator::try_fold`]
3408 - [`Iterator::try_for_each`]
3410 - [`Option::filter`]
3411 - [`String::replace_range`]
3412 - [`Take::set_limit`]
3413 - [`hint::unreachable_unchecked`]
3414 - [`os::unix::process::parent_id`]
3415 - [`ptr::swap_nonoverlapping`]
3416 - [`slice::rsplit_mut`]
3418 - [`slice::swap_with_slice`]
3422 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3423 `readme`, and `repository` fields.][cargo/5386]
3424 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3425 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3426 a different directory than `target` for placing compilation artifacts.
3427 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3428 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3429 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3430 where cargo would infer a binary, Cargo will produce a warning. You can
3431 disable this feature ahead of time by setting any of the following to false:
3432 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3433 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3434 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3438 - [Added “The Rustc book” into the official documentation.][49707]
3439 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3440 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3444 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3445 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3446 compile, `"".is_empty()` will still compile.
3447 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3448 will only print the inner type.][48553] E.g.
3449 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3450 not `AtomicBool(true)`.
3451 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3452 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3453 alignment should cover all use cases.
3454 - The `.description()` method on the `std::error::Error` trait
3455 [has been soft-deprecated][50163]. It is no longer required to implement it.
3457 [48553]: https://github.com/rust-lang/rust/pull/48553/
3458 [48851]: https://github.com/rust-lang/rust/pull/48851/
3459 [48925]: https://github.com/rust-lang/rust/pull/48925/
3460 [49533]: https://github.com/rust-lang/rust/pull/49533/
3461 [49623]: https://github.com/rust-lang/rust/pull/49623/
3462 [49630]: https://github.com/rust-lang/rust/pull/49630/
3463 [49664]: https://github.com/rust-lang/rust/pull/49664/
3464 [49699]: https://github.com/rust-lang/rust/pull/49699/
3465 [49707]: https://github.com/rust-lang/rust/pull/49707/
3466 [49719]: https://github.com/rust-lang/rust/pull/49719/
3467 [49896]: https://github.com/rust-lang/rust/pull/49896/
3468 [49968]: https://github.com/rust-lang/rust/pull/49968/
3469 [50163]: https://github.com/rust-lang/rust/pull/50163
3470 [50177]: https://github.com/rust-lang/rust/pull/50177/
3471 [50378]: https://github.com/rust-lang/rust/pull/50378/
3472 [50398]: https://github.com/rust-lang/rust/pull/50398/
3473 [50423]: https://github.com/rust-lang/rust/pull/50423/
3474 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3475 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3476 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3477 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3478 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3479 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3480 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3481 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3482 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3483 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3484 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3485 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3486 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3487 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3488 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3489 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3490 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3491 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3492 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3493 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3494 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3495 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3496 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3497 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3498 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3499 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3500 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3501 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3502 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3503 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3506 Version 1.26.2 (2018-06-05)
3507 ==========================
3512 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3514 [51117]: https://github.com/rust-lang/rust/issues/51117
3517 Version 1.26.1 (2018-05-29)
3518 ==========================
3523 - [RLS now works on Windows.][50646]
3524 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3530 - [`fn main() -> impl Trait` no longer works for non-Termination
3532 This reverts an accidental stabilization.
3533 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3534 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3536 [50646]: https://github.com/rust-lang/rust/issues/50646
3537 [50656]: https://github.com/rust-lang/rust/pull/50656
3538 [50812]: https://github.com/rust-lang/rust/pull/50812
3539 [50950]: https://github.com/rust-lang/rust/issues/50950
3540 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3542 Version 1.26.0 (2018-05-10)
3543 ==========================
3547 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3548 implement either or both traits.][49299]
3549 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3550 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3551 lifetime can be elided.][49458]
3552 - [`impl Trait` is now stable allowing you to have abstract types in returns
3553 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3554 `fn open(path: impl AsRef<Path>)`.
3555 - [Pattern matching will now automatically apply dereferences.][49394]
3556 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3557 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3558 - [A lot of operations are now available in a const context.][46882] E.g. You
3559 can now index into constant arrays, reference and dereference into constants,
3560 and use tuple struct constructors.
3561 - [Fixed entry slice patterns are now stable.][48516] E.g.
3563 let points = [1, 2, 3, 4];
3565 [1, 2, 3, 4] => println!("All points were sequential."),
3566 _ => println!("Not all points were sequential."),
3573 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3574 - [Fixed exponential projection complexity on nested types.][48296]
3575 This can provide up to a ~12% reduction in compile times for certain crates.
3576 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3577 to remap path prefixes outputted by the compiler.
3578 - [Added `powerpc-unknown-netbsd` target.][48281]
3582 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3583 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3584 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3585 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3586 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3587 - [`ascii::escape_default` is now available in libcore.][48735]
3588 - [Trailing commas are now supported in std and core macros.][48056]
3589 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3590 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3595 - [`*const T::copy_to_nonoverlapping`]
3596 - [`*const T::copy_to`]
3597 - [`*const T::read_unaligned`]
3598 - [`*const T::read_volatile`]
3599 - [`*const T::read`]
3601 - [`*const T::wrapping_add`]
3602 - [`*const T::wrapping_sub`]
3604 - [`*mut T::copy_to_nonoverlapping`]
3605 - [`*mut T::copy_to`]
3606 - [`*mut T::read_unaligned`]
3607 - [`*mut T::read_volatile`]
3609 - [`*mut T::replace`]
3612 - [`*mut T::wrapping_add`]
3613 - [`*mut T::wrapping_sub`]
3614 - [`*mut T::write_bytes`]
3615 - [`*mut T::write_unaligned`]
3616 - [`*mut T::write_volatile`]
3619 - [`FromUtf8Error::as_bytes`]
3620 - [`LocalKey::try_with`]
3621 - [`Option::cloned`]
3622 - [`btree_map::Entry::and_modify`]
3623 - [`fs::read_to_string`]
3626 - [`hash_map::Entry::and_modify`]
3627 - [`iter::FusedIterator`]
3628 - [`ops::RangeInclusive`]
3629 - [`ops::RangeToInclusive`]
3631 - [`slice::rotate_left`]
3632 - [`slice::rotate_right`]
3633 - [`String::retain`]
3638 - [Cargo will now output path to custom commands when `-v` is
3639 passed with `--list`][cargo/5041]
3640 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3644 - [The second edition of "The Rust Programming Language" book is now recommended
3645 over the first.][48404]
3650 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3651 syntax is now invalid.
3653 use std::ops::Fn as dyn;
3654 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3656 - [The result of dereferences are no longer promoted to `'static`.][47408]
3660 const PAIR: &(i32, i32) = &(0, 1);
3661 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3664 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3665 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3667 - [Removed hoedown from rustdoc.][48274]
3668 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3670 [46882]: https://github.com/rust-lang/rust/pull/46882
3671 [47379]: https://github.com/rust-lang/rust/pull/47379
3672 [47408]: https://github.com/rust-lang/rust/pull/47408
3673 [47813]: https://github.com/rust-lang/rust/pull/47813
3674 [48056]: https://github.com/rust-lang/rust/pull/48056
3675 [48125]: https://github.com/rust-lang/rust/pull/48125
3676 [48166]: https://github.com/rust-lang/rust/pull/48166
3677 [48235]: https://github.com/rust-lang/rust/pull/48235
3678 [48274]: https://github.com/rust-lang/rust/pull/48274
3679 [48281]: https://github.com/rust-lang/rust/pull/48281
3680 [48296]: https://github.com/rust-lang/rust/pull/48296
3681 [48326]: https://github.com/rust-lang/rust/pull/48326
3682 [48359]: https://github.com/rust-lang/rust/pull/48359
3683 [48404]: https://github.com/rust-lang/rust/pull/48404
3684 [48481]: https://github.com/rust-lang/rust/pull/48481
3685 [48516]: https://github.com/rust-lang/rust/pull/48516
3686 [48628]: https://github.com/rust-lang/rust/pull/48628
3687 [48629]: https://github.com/rust-lang/rust/pull/48629
3688 [48657]: https://github.com/rust-lang/rust/pull/48657
3689 [48735]: https://github.com/rust-lang/rust/pull/48735
3690 [48978]: https://github.com/rust-lang/rust/pull/48978
3691 [49101]: https://github.com/rust-lang/rust/pull/49101
3692 [49109]: https://github.com/rust-lang/rust/pull/49109
3693 [49121]: https://github.com/rust-lang/rust/pull/49121
3694 [49162]: https://github.com/rust-lang/rust/pull/49162
3695 [49184]: https://github.com/rust-lang/rust/pull/49184
3696 [49234]: https://github.com/rust-lang/rust/pull/49234
3697 [49255]: https://github.com/rust-lang/rust/pull/49255
3698 [49299]: https://github.com/rust-lang/rust/pull/49299
3699 [49305]: https://github.com/rust-lang/rust/pull/49305
3700 [49394]: https://github.com/rust-lang/rust/pull/49394
3701 [49458]: https://github.com/rust-lang/rust/pull/49458
3702 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3703 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3704 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3705 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3706 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3707 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3708 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3709 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3710 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3711 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3712 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3713 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3714 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3715 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3716 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3717 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3718 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3719 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3720 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3721 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3722 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3723 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3724 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3725 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3726 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3727 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3728 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3729 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3730 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3731 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3732 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3733 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3734 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3735 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3736 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3737 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3738 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3739 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3740 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3741 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3742 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3743 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3746 Version 1.25.0 (2018-03-29)
3747 ==========================
3751 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3752 - [You can now use nested groups of imports.][47948]
3753 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3754 - [You can now have `|` at the start of a match arm.][47947] e.g.
3756 enum Foo { A, B, C }
3762 | Foo::B => println!("AB"),
3763 | Foo::C => println!("C"),
3770 - [Upgraded to LLVM 6.][47828]
3771 - [Added `-C lto=val` option.][47521]
3772 - [Added `i586-unknown-linux-musl` target][47282]
3776 - [Impl Send for `process::Command` on Unix.][47760]
3777 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3778 - [`UnsafeCell::into_inner` is now safe.][47204]
3779 - [Implement libstd for CloudABI.][47268]
3780 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3781 - [Implement `AsRef<Path>` for Component][46985]
3782 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3783 - [Moved `Duration` to libcore.][46666]
3787 - [`Location::column`]
3790 The following functions can now be used in a constant expression.
3791 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3792 - [`Duration::new`][47300]
3793 - [`Duration::from_secs`][47300]
3794 - [`Duration::from_millis`][47300]
3798 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3799 - [`cargo new` now defaults to creating a binary crate, instead of a
3800 library crate.][cargo/5029]
3804 - [Rust by example is now shipped with new releases][46196]
3808 - [Deprecated `net::lookup_host`.][47510]
3809 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3810 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3811 around indexing operations (see [#47349][47349]). This has been fixed (which also
3812 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3813 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3815 [33903]: https://github.com/rust-lang/rust/pull/33903
3816 [47947]: https://github.com/rust-lang/rust/pull/47947
3817 [47948]: https://github.com/rust-lang/rust/pull/47948
3818 [47760]: https://github.com/rust-lang/rust/pull/47760
3819 [47790]: https://github.com/rust-lang/rust/pull/47790
3820 [47828]: https://github.com/rust-lang/rust/pull/47828
3821 [47398]: https://github.com/rust-lang/rust/pull/47398
3822 [47510]: https://github.com/rust-lang/rust/pull/47510
3823 [47521]: https://github.com/rust-lang/rust/pull/47521
3824 [47204]: https://github.com/rust-lang/rust/pull/47204
3825 [47251]: https://github.com/rust-lang/rust/pull/47251
3826 [47268]: https://github.com/rust-lang/rust/pull/47268
3827 [47282]: https://github.com/rust-lang/rust/pull/47282
3828 [47300]: https://github.com/rust-lang/rust/pull/47300
3829 [47349]: https://github.com/rust-lang/rust/pull/47349
3830 [46931]: https://github.com/rust-lang/rust/pull/46931
3831 [46985]: https://github.com/rust-lang/rust/pull/46985
3832 [47006]: https://github.com/rust-lang/rust/pull/47006
3833 [46830]: https://github.com/rust-lang/rust/pull/46830
3834 [46095]: https://github.com/rust-lang/rust/pull/46095
3835 [46666]: https://github.com/rust-lang/rust/pull/46666
3836 [46196]: https://github.com/rust-lang/rust/pull/46196
3837 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3838 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3839 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3840 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3841 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3844 Version 1.24.1 (2018-03-01)
3845 ==========================
3847 - [Do not abort when unwinding through FFI][48251]
3848 - [Emit UTF-16 files for linker arguments on Windows][48318]
3849 - [Make the error index generator work again][48308]
3850 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3852 [48251]: https://github.com/rust-lang/rust/issues/48251
3853 [48308]: https://github.com/rust-lang/rust/issues/48308
3854 [48318]: https://github.com/rust-lang/rust/issues/48318
3855 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3858 Version 1.24.0 (2018-02-15)
3859 ==========================
3863 - [External `sysv64` ffi is now available.][46528]
3864 eg. `extern "sysv64" fn foo () {}`
3868 - [rustc now uses 16 codegen units by default for release builds.][46910]
3869 For the fastest builds, utilize `codegen-units=1`.
3870 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3871 - [Add `aarch64-unknown-openbsd` support][46760]
3875 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3876 improvement in performance in the majority of cases.
3877 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3878 with Windows.][46798]
3879 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3880 - [impl `From<bool>` for `AtomicBool`][46293]
3881 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3882 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3883 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3884 - [float::from_bits now just uses transmute.][46012] This provides
3885 some optimisations from LLVM.
3886 - [Copied `AsciiExt` methods onto `char`][46077]
3887 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3888 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3889 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3890 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3894 - [`RefCell::replace`]
3896 - [`atomic::spin_loop_hint`]
3898 The following functions can now be used in a constant expression.
3899 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3901 - [`AtomicBool::new`][46287]
3902 - [`AtomicUsize::new`][46287]
3903 - [`AtomicIsize::new`][46287]
3904 - [`AtomicPtr::new`][46287]
3905 - [`Cell::new`][46287]
3906 - [`{integer}::min_value`][46287]
3907 - [`{integer}::max_value`][46287]
3908 - [`mem::size_of`][46287]
3909 - [`mem::align_of`][46287]
3910 - [`ptr::null`][46287]
3911 - [`ptr::null_mut`][46287]
3912 - [`RefCell::new`][46287]
3913 - [`UnsafeCell::new`][46287]
3917 - [Added a `workspace.default-members` config that
3918 overrides implied `--all` in virtual workspaces.][cargo/4743]
3919 - [Enable incremental by default on development builds.][cargo/4817] Also added
3920 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3921 per-project or global basis respectively.
3928 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3929 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3930 in accordance with IETF RFC 4291 §2.2.
3931 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3932 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3933 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3934 - [Leading zeros in tuple struct members is now an error][47084]
3935 - [`column!()` macro is one-based instead of zero-based][46977]
3936 - [`fmt::Arguments` can no longer be shared across threads][45198]
3937 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3938 - [Cargo sets a different working directory for the compiler][cargo/4788]
3940 [44884]: https://github.com/rust-lang/rust/pull/44884
3941 [45198]: https://github.com/rust-lang/rust/pull/45198
3942 [45506]: https://github.com/rust-lang/rust/pull/45506
3943 [45904]: https://github.com/rust-lang/rust/pull/45904
3944 [45990]: https://github.com/rust-lang/rust/pull/45990
3945 [46012]: https://github.com/rust-lang/rust/pull/46012
3946 [46077]: https://github.com/rust-lang/rust/pull/46077
3947 [46094]: https://github.com/rust-lang/rust/pull/46094
3948 [46284]: https://github.com/rust-lang/rust/pull/46284
3949 [46287]: https://github.com/rust-lang/rust/pull/46287
3950 [46293]: https://github.com/rust-lang/rust/pull/46293
3951 [46528]: https://github.com/rust-lang/rust/pull/46528
3952 [46671]: https://github.com/rust-lang/rust/pull/46671
3953 [46713]: https://github.com/rust-lang/rust/pull/46713
3954 [46735]: https://github.com/rust-lang/rust/pull/46735
3955 [46749]: https://github.com/rust-lang/rust/pull/46749
3956 [46760]: https://github.com/rust-lang/rust/pull/46760
3957 [46798]: https://github.com/rust-lang/rust/pull/46798
3958 [46828]: https://github.com/rust-lang/rust/pull/46828
3959 [46831]: https://github.com/rust-lang/rust/pull/46831
3960 [46833]: https://github.com/rust-lang/rust/pull/46833
3961 [46910]: https://github.com/rust-lang/rust/pull/46910
3962 [46977]: https://github.com/rust-lang/rust/pull/46977
3963 [47018]: https://github.com/rust-lang/rust/pull/47018
3964 [47080]: https://github.com/rust-lang/rust/pull/47080
3965 [47084]: https://github.com/rust-lang/rust/pull/47084
3966 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3967 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3968 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3969 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3970 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3971 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3974 Version 1.23.0 (2018-01-04)
3975 ==========================
3979 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3980 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3981 Which should fix some confusing errors in some operations.
3985 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3986 undefined behavior.][45920]
3987 - [rustc now suggests renaming import if names clash.][45660]
3988 - [Display errors/warnings correctly when there are zero-width or
3989 wide characters.][45711]
3990 - [rustc now avoids unnecessary copies of arguments that are
3991 simple bindings][45380] This should improve memory usage on average by 5-10%.
3992 - [Updated musl used to build musl rustc to 1.1.17][45393]
3996 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3997 - [Implement Hash for raw pointers to unsized types][45483]
3998 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3999 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4000 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4001 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4002 and `<*mut T>::as_mut`][44932]
4003 - [Optimized `Thread::{park, unpark}` implementation][45524]
4004 - [Improved `SliceExt::binary_search` performance.][45333]
4005 - [impl `FromIterator<()>` for `()`][45379]
4006 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4014 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4015 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4016 - [Added unit test checking to `cargo check`][cargo/4592]
4017 - [Cargo now lets you install a specific version
4018 using `cargo install --version`][cargo/4637]
4022 - [Releases now ship with the Cargo book documentation.][45692]
4023 - [rustdoc now prints rendering warnings on every run.][45324]
4027 - [Changes have been made to type equality to make it more correct,
4028 in rare cases this could break some code.][45853] [Tracking issue for
4029 further information][45852]
4030 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4031 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4032 Android 9, the minimum supported version is Android 14.
4033 - [Bumped the minimum LLVM to 3.9][45326]
4035 [44042]: https://github.com/rust-lang/rust/pull/44042
4036 [44932]: https://github.com/rust-lang/rust/pull/44932
4037 [45267]: https://github.com/rust-lang/rust/pull/45267
4038 [45324]: https://github.com/rust-lang/rust/pull/45324
4039 [45326]: https://github.com/rust-lang/rust/pull/45326
4040 [45333]: https://github.com/rust-lang/rust/pull/45333
4041 [45379]: https://github.com/rust-lang/rust/pull/45379
4042 [45380]: https://github.com/rust-lang/rust/pull/45380
4043 [45393]: https://github.com/rust-lang/rust/pull/45393
4044 [45435]: https://github.com/rust-lang/rust/pull/45435
4045 [45483]: https://github.com/rust-lang/rust/pull/45483
4046 [45524]: https://github.com/rust-lang/rust/pull/45524
4047 [45571]: https://github.com/rust-lang/rust/pull/45571
4048 [45580]: https://github.com/rust-lang/rust/pull/45580
4049 [45610]: https://github.com/rust-lang/rust/pull/45610
4050 [45660]: https://github.com/rust-lang/rust/pull/45660
4051 [45692]: https://github.com/rust-lang/rust/pull/45692
4052 [45711]: https://github.com/rust-lang/rust/pull/45711
4053 [45772]: https://github.com/rust-lang/rust/pull/45772
4054 [45852]: https://github.com/rust-lang/rust/issues/45852
4055 [45853]: https://github.com/rust-lang/rust/pull/45853
4056 [45887]: https://github.com/rust-lang/rust/pull/45887
4057 [45920]: https://github.com/rust-lang/rust/pull/45920
4058 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4059 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4060 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4063 Version 1.22.1 (2017-11-22)
4064 ==========================
4066 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4068 [46183]: https://github.com/rust-lang/rust/pull/46183
4070 Version 1.22.0 (2017-11-22)
4071 ==========================
4075 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4076 - [Now accepts underscores in unicode escapes][43716]
4077 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4078 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4082 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4083 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4084 This should decrease compile times for debug builds.
4085 - [strict memory alignment now enabled on ARMv6][45094]
4086 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4090 - [Allow atomic operations up to 32 bits
4091 on `armv5te_unknown_linux_gnueabi`][44978]
4092 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4093 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4094 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4095 - [Properly detect overflow in `Instant += Duration`.][44220]
4096 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4097 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4098 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4105 - [Cargo will now build multi file examples in subdirectories of the `examples`
4106 folder that have a `main.rs` file.][cargo/4496]
4107 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4108 the old format will continue to work and can be updated with `cargo update`.
4109 - [Now supports vendoring git repositories][cargo/3992]
4113 - [`libbacktrace` is now available on Apple platforms.][44251]
4114 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4115 This now lets you specify that a given code example will fail to compile.
4119 - [The minimum Android version that rustc can build for has been bumped
4120 to `4.0` from `2.3`][45656]
4121 - [Allowing `T op= &T` for numeric types has broken some type
4122 inference cases][45480]
4125 [42526]: https://github.com/rust-lang/rust/pull/42526
4126 [43017]: https://github.com/rust-lang/rust/pull/43017
4127 [43716]: https://github.com/rust-lang/rust/pull/43716
4128 [43949]: https://github.com/rust-lang/rust/pull/43949
4129 [44015]: https://github.com/rust-lang/rust/pull/44015
4130 [44220]: https://github.com/rust-lang/rust/pull/44220
4131 [44251]: https://github.com/rust-lang/rust/pull/44251
4132 [44287]: https://github.com/rust-lang/rust/pull/44287
4133 [44303]: https://github.com/rust-lang/rust/pull/44303
4134 [44456]: https://github.com/rust-lang/rust/pull/44456
4135 [44466]: https://github.com/rust-lang/rust/pull/44466
4136 [44895]: https://github.com/rust-lang/rust/pull/44895
4137 [44966]: https://github.com/rust-lang/rust/pull/44966
4138 [44978]: https://github.com/rust-lang/rust/pull/44978
4139 [45041]: https://github.com/rust-lang/rust/pull/45041
4140 [45064]: https://github.com/rust-lang/rust/pull/45064
4141 [45075]: https://github.com/rust-lang/rust/pull/45075
4142 [45094]: https://github.com/rust-lang/rust/pull/45094
4143 [45095]: https://github.com/rust-lang/rust/pull/45095
4144 [45480]: https://github.com/rust-lang/rust/issues/45480
4145 [45656]: https://github.com/rust-lang/rust/pull/45656
4146 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4147 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4148 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4155 Version 1.21.0 (2017-10-12)
4156 ==========================
4160 - [You can now use static references for literals.][43838]
4164 let x: &'static u32 = &0;
4167 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4170 my_macro!(Vec<i32>::new); // Always worked
4171 my_macro!(Vec::<i32>::new); // Now works
4176 - [Upgraded jemalloc to 4.5.0][43911]
4177 - [Enabled unwinding panics on Redox][43917]
4178 - [Now runs LLVM in parallel during translation phase.][43506]
4179 This should reduce peak memory usage.
4183 - [Generate builtin impls for `Clone` for all arrays and tuples that
4184 are `T: Clone`][43690]
4185 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4186 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4187 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4192 [`std::mem::discriminant`]
4196 - [You can now call `cargo install` with multiple package names][cargo/4216]
4197 - [Cargo commands inside a virtual workspace will now implicitly
4198 pass `--all`][cargo/4335]
4199 - [Added a `[patch]` section to `Cargo.toml` to handle
4200 prepublication dependencies][cargo/4123] [RFC 1969]
4201 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4202 like patterns][cargo/4270]
4203 - [Added the `--all-targets` option][cargo/4400]
4204 - [Using required dependencies as a feature is now deprecated and emits
4205 a warning][cargo/4364]
4210 - [Cargo docs are moving][43916]
4211 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4212 - [The rustdoc book is now available][43863]
4213 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4214 - [Added a preview of RLS has been made available through rustup][44204]
4215 Install with `rustup component add rls-preview`
4216 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4217 Previously only showed `std::os::unix`.
4221 - [Changes in method matching against higher-ranked types][43880] This may cause
4222 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4223 - [rustc's JSON error output's byte position start at top of file.][42973]
4224 Was previously relative to the rustc's internal `CodeMap` struct which
4225 required the unstable library `libsyntax` to correctly use.
4226 - [`unused_results` lint no longer ignores booleans][43728]
4228 [42565]: https://github.com/rust-lang/rust/pull/42565
4229 [42973]: https://github.com/rust-lang/rust/pull/42973
4230 [43348]: https://github.com/rust-lang/rust/pull/43348
4231 [43459]: https://github.com/rust-lang/rust/pull/43459
4232 [43506]: https://github.com/rust-lang/rust/pull/43506
4233 [43540]: https://github.com/rust-lang/rust/pull/43540
4234 [43690]: https://github.com/rust-lang/rust/pull/43690
4235 [43728]: https://github.com/rust-lang/rust/pull/43728
4236 [43838]: https://github.com/rust-lang/rust/pull/43838
4237 [43863]: https://github.com/rust-lang/rust/pull/43863
4238 [43880]: https://github.com/rust-lang/rust/pull/43880
4239 [43911]: https://github.com/rust-lang/rust/pull/43911
4240 [43916]: https://github.com/rust-lang/rust/pull/43916
4241 [43917]: https://github.com/rust-lang/rust/pull/43917
4242 [44204]: https://github.com/rust-lang/rust/pull/44204
4243 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4244 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4245 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4246 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4247 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4248 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4249 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4250 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4251 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4253 Version 1.20.0 (2017-08-31)
4254 ===========================
4258 - [Associated constants are now stabilised.][42809]
4259 - [A lot of macro bugs are now fixed.][42913]
4264 - [Struct fields are now properly coerced to the expected field type.][42807]
4265 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4266 `wasm32-experimental-emscripten` target.
4267 - [Changed some of the error messages to be more helpful.][42033]
4268 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4270 - [rustc now reports the total number of errors on compilation failure][43015]
4271 previously this was only the number of errors in the pass that failed.
4272 - [Expansion in rustc has been sped up 29x.][42533]
4273 - [added `msp430-none-elf` target.][43099]
4274 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4276 - [Fixes backtraces on Redox][43228]
4277 - [rustc now identifies different versions of same crate when absolute paths of
4278 different types match in an error message.][42826]
4284 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4285 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4287 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4288 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4289 - [Impl `Clone` for `DefaultHasher`.][42799]
4290 - [Impl `Sync` for `SyncSender`.][42397]
4291 - [Impl `FromStr` for `char`][42271]
4292 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4294 - [allow messages in the `unimplemented!()` macro.][42155]
4295 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4296 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4297 - [Upgrade to Unicode 10.0.0][42999]
4298 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4299 - [Skip the main thread's manual stack guard on Linux][43072]
4300 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4301 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4303 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4308 - [`CStr::into_c_string`]
4309 - [`CString::as_c_str`]
4310 - [`CString::into_boxed_c_str`]
4311 - [`Chain::get_mut`]
4312 - [`Chain::get_ref`]
4313 - [`Chain::into_inner`]
4314 - [`Option::get_or_insert_with`]
4315 - [`Option::get_or_insert`]
4316 - [`OsStr::into_os_string`]
4317 - [`OsString::into_boxed_os_str`]
4320 - [`Utf8Error::error_len`]
4321 - [`char::EscapeDebug`]
4322 - [`char::escape_debug`]
4323 - [`compile_error!`]
4324 - [`f32::from_bits`]
4326 - [`f64::from_bits`]
4328 - [`mem::ManuallyDrop`]
4329 - [`slice::sort_unstable_by_key`]
4330 - [`slice::sort_unstable_by`]
4331 - [`slice::sort_unstable`]
4332 - [`str::from_boxed_utf8_unchecked`]
4333 - [`str::as_bytes_mut`]
4334 - [`str::as_bytes_mut`]
4335 - [`str::from_utf8_mut`]
4336 - [`str::from_utf8_unchecked_mut`]
4338 - [`str::get_unchecked_mut`]
4339 - [`str::get_unchecked`]
4341 - [`str::into_boxed_bytes`]
4346 - [Cargo API token location moved from `~/.cargo/config` to
4347 `~/.cargo/credentials`.][cargo/3978]
4348 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4349 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4350 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4351 - [You can now specify version of a binary when installed through
4352 `cargo install` using `--vers`.][cargo/4229]
4353 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4354 failure.][cargo/4248]
4355 - [Changed the convention around which file is the crate root.][cargo/4259]
4356 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4357 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4362 - [Functions with `'static` in their return types will now not be as usable as
4363 if they were using lifetime parameters instead.][42417]
4364 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4365 takes the sign of NaN into account where previously didn't.][42430]
4367 [42033]: https://github.com/rust-lang/rust/pull/42033
4368 [42155]: https://github.com/rust-lang/rust/pull/42155
4369 [42271]: https://github.com/rust-lang/rust/pull/42271
4370 [42397]: https://github.com/rust-lang/rust/pull/42397
4371 [42417]: https://github.com/rust-lang/rust/pull/42417
4372 [42430]: https://github.com/rust-lang/rust/pull/42430
4373 [42431]: https://github.com/rust-lang/rust/pull/42431
4374 [42533]: https://github.com/rust-lang/rust/pull/42533
4375 [42571]: https://github.com/rust-lang/rust/pull/42571
4376 [42613]: https://github.com/rust-lang/rust/pull/42613
4377 [42799]: https://github.com/rust-lang/rust/pull/42799
4378 [42807]: https://github.com/rust-lang/rust/pull/42807
4379 [42809]: https://github.com/rust-lang/rust/pull/42809
4380 [42822]: https://github.com/rust-lang/rust/pull/42822
4381 [42826]: https://github.com/rust-lang/rust/pull/42826
4382 [42854]: https://github.com/rust-lang/rust/pull/42854
4383 [42913]: https://github.com/rust-lang/rust/pull/42913
4384 [42999]: https://github.com/rust-lang/rust/pull/42999
4385 [43011]: https://github.com/rust-lang/rust/pull/43011
4386 [43015]: https://github.com/rust-lang/rust/pull/43015
4387 [43072]: https://github.com/rust-lang/rust/pull/43072
4388 [43077]: https://github.com/rust-lang/rust/pull/43077
4389 [43097]: https://github.com/rust-lang/rust/pull/43097
4390 [43099]: https://github.com/rust-lang/rust/pull/43099
4391 [43170]: https://github.com/rust-lang/rust/pull/43170
4392 [43178]: https://github.com/rust-lang/rust/pull/43178
4393 [43185]: https://github.com/rust-lang/rust/pull/43185
4394 [43228]: https://github.com/rust-lang/rust/pull/43228
4395 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4396 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4397 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4398 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4399 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4400 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4401 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4402 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4403 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4404 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4405 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4406 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4407 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4408 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4409 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4410 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4411 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4412 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4413 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4414 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4415 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4416 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4417 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4418 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4419 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4420 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4421 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4422 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4423 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4424 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4425 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4426 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4427 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4428 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4429 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4430 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4431 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4432 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4433 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4436 Version 1.19.0 (2017-07-20)
4437 ===========================
4442 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4443 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4444 - [Macro recursion limit increased to 1024 from 64.][41676]
4445 - [Added lint for detecting unused macros.][41907]
4446 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4447 For example: `let x = loop { break 7; };`
4448 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4449 contain `Copy` types and cannot have a `Drop` implementation.
4450 Example: `union Foo { bar: u8, baz: usize }`
4451 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4452 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4457 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4458 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4459 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4460 you should use `--target armv7-linux-androideabi`.
4461 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4462 - [Minor optimisation of string operations.][42037]
4463 - [Compiler error message is now `aborting due to previous error(s)` instead of
4464 `aborting due to N previous errors`][42150] This was previously inaccurate and
4465 would only count certain kinds of errors.
4466 - [The compiler now supports Visual Studio 2017][42225]
4467 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4468 - [Added a lot][42264] of [new error codes][42302]
4469 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4470 libraries with C Run-time Libraries(CRT) to be statically linked.
4471 - [Fixed various ARM codegen bugs][42740]
4476 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4477 `Extend<Cow<'a, str>>`][41449]
4478 - [`Vec` now implements `From<&mut [T]>`][41530]
4479 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4480 - [`SplitWhitespace` now implements `Clone`][41659]
4481 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4483 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4484 macros, but for printing to stderr.
4489 - [`OsString::shrink_to_fit`]
4492 - [`thread::ThreadId`]
4497 - [Build scripts can now add environment variables to the environment
4498 the crate is being compiled in.
4499 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4500 - [Subcommands now replace the current process rather than spawning a new
4501 child process][cargo/3970]
4502 - [Workspace members can now accept glob file patterns][cargo/3979]
4503 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4504 the members in a given workspace.][cargo/3988]
4505 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4506 - [Target directory path is now in the cargo metadata][cargo/4022]
4507 - [Cargo no longer checks out a local working directory for the
4508 crates.io index][cargo/4026] This should provide smaller file size for the
4509 registry, and improve cloning times, especially on Windows machines.
4510 - [Added an `--exclude` option for excluding certain packages when using the
4511 `--all` option][cargo/4031]
4512 - [Cargo will now automatically retry when receiving a 5xx error
4513 from crates.io][cargo/4032]
4514 - [The `--features` option now accepts multiple comma or space
4515 delimited values.][cargo/4084]
4516 - [Added support for custom target specific runners][cargo/3954]
4521 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4523 - [Rust will now release XZ compressed packages][rust-installer/57]
4524 - [rustup will now prefer to download rust packages with
4525 XZ compression][rustup/1100] over GZip packages.
4526 - [Added the ability to escape `#` in rust documentation][41785] By adding
4527 additional `#`'s ie. `##` is now `#`
4532 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4533 - [`-Z` flags are now no longer allowed to be used on the stable
4534 compiler.][41751] This has been a warning for a year previous to this.
4535 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4536 longer works][42844]. Users should migrate to the built-in `check`
4537 command, which has been available since 1.16.
4538 - [Ending a float literal with `._` is now a hard error.
4539 Example: `42._` .][41946]
4540 - [Any use of a private `extern crate` outside of its module is now a
4541 hard error.][36886] This was previously a warning.
4542 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4543 relative while the `::` prefix makes a path absolute, but was ignored and the
4544 path was relative regardless.
4545 - [Floating point constants in match patterns is now a hard error][36890]
4546 This was previously a warning.
4547 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4548 match patterns is now a hard error][36891] This was previously a warning.
4549 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4551 - [From the pound escape, lines consisting of multiple `#`s are
4553 - [It is an error to re-export private enum variants][42460]. This is
4554 known to break a number of crates that depend on an older version of
4556 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4557 to use it to find the linker, and the build will fail where it did
4558 not previously][42607]
4560 [36886]: https://github.com/rust-lang/rust/issues/36886
4561 [36888]: https://github.com/rust-lang/rust/issues/36888
4562 [36890]: https://github.com/rust-lang/rust/issues/36890
4563 [36891]: https://github.com/rust-lang/rust/issues/36891
4564 [36892]: https://github.com/rust-lang/rust/issues/36892
4565 [37406]: https://github.com/rust-lang/rust/issues/37406
4566 [39983]: https://github.com/rust-lang/rust/pull/39983
4567 [41145]: https://github.com/rust-lang/rust/pull/41145
4568 [41192]: https://github.com/rust-lang/rust/pull/41192
4569 [41258]: https://github.com/rust-lang/rust/pull/41258
4570 [41370]: https://github.com/rust-lang/rust/pull/41370
4571 [41449]: https://github.com/rust-lang/rust/pull/41449
4572 [41530]: https://github.com/rust-lang/rust/pull/41530
4573 [41624]: https://github.com/rust-lang/rust/pull/41624
4574 [41656]: https://github.com/rust-lang/rust/pull/41656
4575 [41659]: https://github.com/rust-lang/rust/pull/41659
4576 [41676]: https://github.com/rust-lang/rust/pull/41676
4577 [41751]: https://github.com/rust-lang/rust/pull/41751
4578 [41764]: https://github.com/rust-lang/rust/pull/41764
4579 [41785]: https://github.com/rust-lang/rust/pull/41785
4580 [41873]: https://github.com/rust-lang/rust/pull/41873
4581 [41907]: https://github.com/rust-lang/rust/pull/41907
4582 [41946]: https://github.com/rust-lang/rust/pull/41946
4583 [42016]: https://github.com/rust-lang/rust/pull/42016
4584 [42037]: https://github.com/rust-lang/rust/pull/42037
4585 [42068]: https://github.com/rust-lang/rust/pull/42068
4586 [42150]: https://github.com/rust-lang/rust/pull/42150
4587 [42162]: https://github.com/rust-lang/rust/pull/42162
4588 [42225]: https://github.com/rust-lang/rust/pull/42225
4589 [42264]: https://github.com/rust-lang/rust/pull/42264
4590 [42302]: https://github.com/rust-lang/rust/pull/42302
4591 [42460]: https://github.com/rust-lang/rust/issues/42460
4592 [42607]: https://github.com/rust-lang/rust/issues/42607
4593 [42740]: https://github.com/rust-lang/rust/pull/42740
4594 [42844]: https://github.com/rust-lang/rust/issues/42844
4595 [42948]: https://github.com/rust-lang/rust/pull/42948
4596 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4597 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4598 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4599 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4600 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4601 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4602 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4603 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4604 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4605 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4606 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4607 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4608 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4609 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4610 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4611 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4612 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4613 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4614 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4615 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4616 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4617 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4620 Version 1.18.0 (2017-06-08)
4621 ===========================
4626 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4627 make the item visible to just that module tree. Also accepts the keyword
4628 `crate` to make something public to the whole crate but not users of the
4629 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4630 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4631 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4632 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4633 types like `Write + Send`, trailing `+` are now supported in trait objects,
4634 and better error reporting for trait objects starting with `?Sized`.
4635 - [0e+10 is now a valid floating point literal][40589]
4636 - [Now warns if you bind a lifetime parameter to 'static][40734]
4637 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4638 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4639 representation in some cases.][40377]
4644 - [rustc can now emit mir with `--emit mir`][39891]
4645 - [Improved LLVM IR for trivial functions][40367]
4646 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4647 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4648 opportunities found through profiling
4649 - [Improved backtrace formatting when panicking][38165]
4654 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4655 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4656 iteration or reallocation.
4657 - [Simplified HashMap Bucket interface][40561] provides performance
4658 improvements for iterating and cloning.
4659 - [Specialize Vec::from_elem to use calloc][40409]
4660 - [Fixed Race condition in fs::create_dir_all][39799]
4661 - [No longer caching stdio on Windows][40516]
4662 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4663 2.50%~ faster and in one case now 12.50% faster.
4664 - [Optimized `AtomicBool::fetch_nand`][41143]
4669 - [`Child::try_wait`]
4670 - [`HashMap::retain`]
4671 - [`HashSet::retain`]
4673 - [`TcpStream::peek`]
4674 - [`UdpSocket::peek`]
4675 - [`UdpSocket::peek_from`]
4680 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4681 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4682 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4683 - [Added Android build support][cargo/3885]
4684 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4685 of a certain type, for example `cargo build --bins` will build all
4687 - [Added support for haiku][cargo/3952]
4692 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4693 - [Added rust-windbg script for better debugging on Windows][39983]
4694 - [Rust now uses the official cross compiler for NetBSD][40612]
4695 - [rustdoc now accepts `#` at the start of files][40828]
4696 - [Fixed jemalloc support for musl][41168]
4701 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4702 always placed after the sign if it exists and before the digits. With the `#`
4703 flag the zeroes are placed after the prefix and before the digits.
4704 - [Due to the struct field optimisation][40377], using `transmute` on structs
4705 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4706 always been undefined behavior, but is now more likely to break in practice.
4707 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4708 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4709 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4710 - [Overlapping inherent `impl`s are now a hard error][40728]
4711 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4712 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4713 `out.asm` and `out.ll` instead of only one of the filetypes.
4714 - [ calling a function that returns `Self` will no longer work][41805] when
4715 the size of `Self` cannot be statically determined.
4716 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4717 this has caused a few regressions namely:
4719 - Changed the link order of local static/dynamic libraries (respecting the
4720 order on given rather than having the compiler reorder).
4721 - Changed how MinGW is linked, native code linked to dynamic libraries
4722 may require manually linking to the gcc support library (for the native
4725 [38165]: https://github.com/rust-lang/rust/pull/38165
4726 [39799]: https://github.com/rust-lang/rust/pull/39799
4727 [39891]: https://github.com/rust-lang/rust/pull/39891
4728 [39983]: https://github.com/rust-lang/rust/pull/39983
4729 [40043]: https://github.com/rust-lang/rust/pull/40043
4730 [40241]: https://github.com/rust-lang/rust/pull/40241
4731 [40338]: https://github.com/rust-lang/rust/pull/40338
4732 [40367]: https://github.com/rust-lang/rust/pull/40367
4733 [40377]: https://github.com/rust-lang/rust/pull/40377
4734 [40409]: https://github.com/rust-lang/rust/pull/40409
4735 [40516]: https://github.com/rust-lang/rust/pull/40516
4736 [40556]: https://github.com/rust-lang/rust/pull/40556
4737 [40561]: https://github.com/rust-lang/rust/pull/40561
4738 [40589]: https://github.com/rust-lang/rust/pull/40589
4739 [40612]: https://github.com/rust-lang/rust/pull/40612
4740 [40723]: https://github.com/rust-lang/rust/pull/40723
4741 [40728]: https://github.com/rust-lang/rust/pull/40728
4742 [40731]: https://github.com/rust-lang/rust/pull/40731
4743 [40734]: https://github.com/rust-lang/rust/pull/40734
4744 [40805]: https://github.com/rust-lang/rust/pull/40805
4745 [40807]: https://github.com/rust-lang/rust/pull/40807
4746 [40828]: https://github.com/rust-lang/rust/pull/40828
4747 [40870]: https://github.com/rust-lang/rust/pull/40870
4748 [41085]: https://github.com/rust-lang/rust/pull/41085
4749 [41143]: https://github.com/rust-lang/rust/pull/41143
4750 [41168]: https://github.com/rust-lang/rust/pull/41168
4751 [41270]: https://github.com/rust-lang/rust/issues/41270
4752 [41469]: https://github.com/rust-lang/rust/pull/41469
4753 [41805]: https://github.com/rust-lang/rust/issues/41805
4754 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4755 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4756 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4757 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4758 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4759 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4760 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4761 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4762 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4763 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4764 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4765 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4766 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4767 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4770 Version 1.17.0 (2017-04-27)
4771 ===========================
4776 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4777 * [Fields of structs may be initialized without duplicating the field/variable
4778 names][39761]. [RFC 1682]
4779 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4780 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4781 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4782 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4783 `'b`. Soundness fix.
4784 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4785 * [Static variables may contain references to other statics][40027]
4790 * [Exit quickly on only `--emit dep-info`][40336]
4791 * [Make `-C relocation-model` more correctly determine whether the linker
4792 creates a position-independent executable][40245]
4793 * [Add `-C overflow-checks` to directly control whether integer overflow
4795 * [The rustc type checker now checks items on demand instead of in a single
4796 in-order pass][40008]. This is mostly an internal refactoring in support of
4797 future work, including incremental type checking, but also resolves [RFC
4798 1647], allowing `Self` to appear in `impl` `where` clauses.
4799 * [Optimize vtable loads][39995]
4800 * [Turn off vectorization for Emscripten targets][39990]
4801 * [Provide suggestions for unknown macros imported with `use`][39953]
4802 * [Fix ICEs in path resolution][39939]
4803 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4804 * [Add clearer error message using `&str + &str`][39116]
4815 * [`Ordering::then`]
4816 * [`Ordering::then_with`]
4817 * [`BTreeMap::range`]
4818 * [`BTreeMap::range_mut`]
4819 * [`collections::Bound`]
4820 * [`process::abort`]
4821 * [`ptr::read_unaligned`]
4822 * [`ptr::write_unaligned`]
4823 * [`Result::expect_err`]
4826 * [`Cell::into_inner`]
4832 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4833 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4834 * [`String` implements `FromIterator<&char>`][40028]
4835 * `Box` [implements][40009] a number of new conversions:
4836 `From<Box<str>> for String`,
4837 `From<Box<[T]>> for Vec<T>`,
4838 `From<Box<CStr>> for CString`,
4839 `From<Box<OsStr>> for OsString`,
4840 `From<Box<Path>> for PathBuf`,
4841 `Into<Box<str>> for String`,
4842 `Into<Box<[T]>> for Vec<T>`,
4843 `Into<Box<CStr>> for CString`,
4844 `Into<Box<OsStr>> for OsString`,
4845 `Into<Box<Path>> for PathBuf`,
4846 `Default for Box<str>`,
4847 `Default for Box<CStr>`,
4848 `Default for Box<OsStr>`,
4849 `From<&CStr> for Box<CStr>`,
4850 `From<&OsStr> for Box<OsStr>`,
4851 `From<&Path> for Box<Path>`
4852 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4853 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4854 * [Slightly optimize `slice::sort`][39538]
4855 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4856 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4857 `Box<str>` implements `From<&str>`][39438]
4858 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4859 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4860 * [`format!` estimates the needed capacity before writing a string][39356]
4861 * [Support unprivileged symlink creation in Windows][38921]
4862 * [`PathBuf` implements `Default`][38764]
4863 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4864 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4865 and poor hash functions.
4870 * [Add `cargo check --all`][cargo/3731]
4871 * [Add an option to ignore SSL revocation checking][cargo/3699]
4872 * [Add `cargo run --package`][cargo/3691]
4873 * [Add `required_features`][cargo/3667]
4874 * [Assume `build.rs` is a build script][cargo/3664]
4875 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4880 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4882 * [The "Unstable Book" documents nightly-only features][ubook]
4883 * [Improve the style of the sidebar in rustdoc output][40265]
4884 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4885 * [Fix MSP430 breakage due to `i128`][40257]
4886 * [Preliminary Solaris/SPARCv9 support][39903]
4887 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4888 run without installing the MSVC runtime.
4889 * [`rustdoc --test` includes file names in test names][39788]
4890 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4891 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4892 * [Initial support for `aarch64-unknown-freebsd`][39491]
4893 * [Initial support for `i686-unknown-netbsd`][39426]
4894 * [This release no longer includes the old makefile build system][39431]. Rust
4895 is built with a custom build system, written in Rust, and with Cargo.
4896 * [Add Debug implementations for libcollection structs][39002]
4897 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4898 * [`--test-threads=0` produces an error][38945]
4899 * [`rustup` installs documentation by default][40526]
4900 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4901 WinDbg and Visual Studio to improve the debugging experience.
4906 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4907 workaround, either use MSVC 2015 or run vcvars.bat.
4908 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4909 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4910 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4912 * [`format!` and `Display::to_string` panic if an underlying formatting
4913 implementation returns an error][40117]. Previously the error was silently
4914 ignored. It is incorrect for `write_fmt` to return an error when writing
4916 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4917 crates were marked stable and could be accessed from the stable toolchain.
4918 * [Rust git source no longer includes vendored crates][39728]. Those that need
4919 to build with vendored crates should build from release tarballs.
4920 * [Fix inert attributes from `proc_macro_derives`][39572]
4921 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4922 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4924 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4925 existing code generally ignores the type of dead-code unless a type-hint is
4926 provided; this can cause surprising inference interactions particularly around
4927 defaulting. The new code uniformly ignores the result type of dead-code.
4928 * [Tuple-struct constructors with private fields are no longer visible][38932]
4929 * [Lifetime parameters that do not appear in the arguments are now considered
4930 early-bound][38897], resolving a soundness bug (#[32330]). The
4931 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4933 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4934 * [Make transmuting from fn item types to pointer-sized types a hard
4937 [27787]: https://github.com/rust-lang/rust/issues/27787
4938 [32330]: https://github.com/rust-lang/rust/issues/32330
4939 [34198]: https://github.com/rust-lang/rust/pull/34198
4940 [38161]: https://github.com/rust-lang/rust/pull/38161
4941 [38368]: https://github.com/rust-lang/rust/pull/38368
4942 [38584]: https://github.com/rust-lang/rust/issues/38584
4943 [38661]: https://github.com/rust-lang/rust/pull/38661
4944 [38764]: https://github.com/rust-lang/rust/pull/38764
4945 [38864]: https://github.com/rust-lang/rust/issues/38864
4946 [38897]: https://github.com/rust-lang/rust/pull/38897
4947 [38921]: https://github.com/rust-lang/rust/pull/38921
4948 [38932]: https://github.com/rust-lang/rust/pull/38932
4949 [38945]: https://github.com/rust-lang/rust/pull/38945
4950 [38981]: https://github.com/rust-lang/rust/pull/38981
4951 [39002]: https://github.com/rust-lang/rust/pull/39002
4952 [39116]: https://github.com/rust-lang/rust/pull/39116
4953 [39193]: https://github.com/rust-lang/rust/pull/39193
4954 [39265]: https://github.com/rust-lang/rust/pull/39265
4955 [39356]: https://github.com/rust-lang/rust/pull/39356
4956 [39372]: https://github.com/rust-lang/rust/pull/39372
4957 [39426]: https://github.com/rust-lang/rust/pull/39426
4958 [39431]: https://github.com/rust-lang/rust/pull/39431
4959 [39438]: https://github.com/rust-lang/rust/pull/39438
4960 [39440]: https://github.com/rust-lang/rust/pull/39440
4961 [39485]: https://github.com/rust-lang/rust/pull/39485
4962 [39491]: https://github.com/rust-lang/rust/pull/39491
4963 [39518]: https://github.com/rust-lang/rust/pull/39518
4964 [39538]: https://github.com/rust-lang/rust/pull/39538
4965 [39572]: https://github.com/rust-lang/rust/pull/39572
4966 [39633]: https://github.com/rust-lang/rust/pull/39633
4967 [39642]: https://github.com/rust-lang/rust/pull/39642
4968 [39728]: https://github.com/rust-lang/rust/pull/39728
4969 [39761]: https://github.com/rust-lang/rust/pull/39761
4970 [39788]: https://github.com/rust-lang/rust/pull/39788
4971 [39793]: https://github.com/rust-lang/rust/pull/39793
4972 [39837]: https://github.com/rust-lang/rust/pull/39837
4973 [39843]: https://github.com/rust-lang/rust/pull/39843
4974 [39851]: https://github.com/rust-lang/rust/pull/39851
4975 [39903]: https://github.com/rust-lang/rust/pull/39903
4976 [39939]: https://github.com/rust-lang/rust/pull/39939
4977 [39953]: https://github.com/rust-lang/rust/pull/39953
4978 [39960]: https://github.com/rust-lang/rust/pull/39960
4979 [39990]: https://github.com/rust-lang/rust/pull/39990
4980 [39995]: https://github.com/rust-lang/rust/pull/39995
4981 [40008]: https://github.com/rust-lang/rust/pull/40008
4982 [40009]: https://github.com/rust-lang/rust/pull/40009
4983 [40027]: https://github.com/rust-lang/rust/pull/40027
4984 [40028]: https://github.com/rust-lang/rust/pull/40028
4985 [40037]: https://github.com/rust-lang/rust/pull/40037
4986 [40117]: https://github.com/rust-lang/rust/pull/40117
4987 [40166]: https://github.com/rust-lang/rust/pull/40166
4988 [40245]: https://github.com/rust-lang/rust/pull/40245
4989 [40257]: https://github.com/rust-lang/rust/pull/40257
4990 [40261]: https://github.com/rust-lang/rust/pull/40261
4991 [40265]: https://github.com/rust-lang/rust/pull/40265
4992 [40319]: https://github.com/rust-lang/rust/pull/40319
4993 [40336]: https://github.com/rust-lang/rust/pull/40336
4994 [40526]: https://github.com/rust-lang/rust/pull/40526
4995 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4996 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4997 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4998 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4999 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5000 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5001 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5002 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5003 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5004 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5005 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5006 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5007 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5008 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5009 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5010 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5011 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5012 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5013 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5014 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5015 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5016 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5017 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5018 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5019 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5020 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5021 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5022 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5023 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5024 [mdbook]: https://crates.io/crates/mdbook
5025 [ubook]: https://doc.rust-lang.org/unstable-book/
5028 Version 1.16.0 (2017-03-16)
5029 ===========================
5034 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5035 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5036 match patterns][38069]
5037 * [Clean up semantics of `self` in an import list][38313]
5038 * [`Self` may appear in `impl` headers][38920]
5039 * [`Self` may appear in struct expressions][39282]
5044 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5045 a `.rmeta` file containing only crate metadata][38571]. This can be
5046 used by tools like the Rust Language Service to perform
5047 metadata-only builds.
5048 * [Levenshtein based typo suggestions now work in most places, while
5049 previously they worked only for fields and sometimes for local
5050 variables][38927]. Together with the overhaul of "no
5051 resolution"/"unexpected resolution" errors (#[38154]) they result in
5052 large and systematic improvement in resolution diagnostics.
5053 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5055 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5056 * [`rustc` no longer attempts to provide "consider using an explicit
5057 lifetime" suggestions][37057]. They were inaccurate.
5062 * [`VecDeque::truncate`]
5063 * [`VecDeque::resize`]
5064 * [`String::insert_str`]
5065 * [`Duration::checked_add`]
5066 * [`Duration::checked_sub`]
5067 * [`Duration::checked_div`]
5068 * [`Duration::checked_mul`]
5071 * [`SocketAddr::is_ipv4`]
5072 * [`SocketAddr::is_ipv6`]
5073 * [`IpAddr::is_ipv4`]
5074 * [`IpAddr::is_ipv6`]
5076 * [`Vec::dedup_by_key`]
5077 * [`Result::unwrap_or_default`]
5078 * [`<*const T>::wrapping_offset`]
5079 * [`<*mut T>::wrapping_offset`]
5080 * `CommandExt::creation_flags`
5081 * [`File::set_permissions`]
5082 * [`String::split_off`]
5087 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5088 their argument by `Borrow` parameter][37761]
5089 * [All public types in std implement `Debug`][38006]
5090 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5091 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5092 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5094 * [std: Fix partial writes in `LineWriter`][38062]
5095 * [std: Clamp max read/write sizes on Unix][38062]
5096 * [Use more specific panic message for `&str` slicing errors][38066]
5097 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5098 functionality cannot be achieved in std currently.
5099 * [`writeln!`, like `println!`, now accepts a form with no string
5100 or formatting arguments, to just print a newline][38469]
5101 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5102 * [Reduce the size of static data in `std_unicode::tables`][38781]
5103 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5104 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5106 * [`Duration` implements `Sum`][38712]
5107 * [`String` implements `ToSocketAddrs`][39048]
5112 * [The `cargo check` command does a type check of a project without
5113 building it][cargo/3296]
5114 * [crates.io will display CI badges from Travis and AppVeyor, if
5115 specified in Cargo.toml][cargo/3546]
5116 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5117 * [Compilation profiles accept integer values for `debug`, in addition
5118 to `true` and `false`. These are passed to `rustc` as the value to
5119 `-C debuginfo`][cargo/3534]
5120 * [Implement `cargo --version --verbose`][cargo/3604]
5121 * [All builds now output 'dep-info' build dependencies compatible with
5122 make and ninja][cargo/3557]
5123 * [Build all workspace members with `build --all`][cargo/3511]
5124 * [Document all workspace members with `doc --all`][cargo/3515]
5125 * [Path deps outside workspace are not members][cargo/3443]
5130 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5131 the path to the Rust implementation][38589]
5132 * [The `armv7-linux-androideabi` target no longer enables NEON
5133 extensions, per Google's ABI guide][38413]
5134 * [The stock standard library can be compiled for Redox OS][38401]
5135 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5137 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5139 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5144 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5145 match patterns][38069]
5146 * In this release, references to uninhabited types can not be
5147 pattern-matched. This was accidentally allowed in 1.15.
5148 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5149 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5151 * [Clean up semantics of `self` in an import list][38313]
5152 * Reimplemented lifetime elision. This change was almost entirely compatible
5153 with existing code, but it did close a number of small bugs and loopholes,
5154 as well as being more accepting in some other [cases][41105].
5156 [37057]: https://github.com/rust-lang/rust/pull/37057
5157 [37761]: https://github.com/rust-lang/rust/pull/37761
5158 [38006]: https://github.com/rust-lang/rust/pull/38006
5159 [38051]: https://github.com/rust-lang/rust/pull/38051
5160 [38062]: https://github.com/rust-lang/rust/pull/38062
5161 [38062]: https://github.com/rust-lang/rust/pull/38622
5162 [38066]: https://github.com/rust-lang/rust/pull/38066
5163 [38069]: https://github.com/rust-lang/rust/pull/38069
5164 [38131]: https://github.com/rust-lang/rust/pull/38131
5165 [38154]: https://github.com/rust-lang/rust/pull/38154
5166 [38274]: https://github.com/rust-lang/rust/pull/38274
5167 [38304]: https://github.com/rust-lang/rust/pull/38304
5168 [38313]: https://github.com/rust-lang/rust/pull/38313
5169 [38314]: https://github.com/rust-lang/rust/pull/38314
5170 [38327]: https://github.com/rust-lang/rust/pull/38327
5171 [38401]: https://github.com/rust-lang/rust/pull/38401
5172 [38413]: https://github.com/rust-lang/rust/pull/38413
5173 [38469]: https://github.com/rust-lang/rust/pull/38469
5174 [38559]: https://github.com/rust-lang/rust/pull/38559
5175 [38571]: https://github.com/rust-lang/rust/pull/38571
5176 [38580]: https://github.com/rust-lang/rust/pull/38580
5177 [38589]: https://github.com/rust-lang/rust/pull/38589
5178 [38670]: https://github.com/rust-lang/rust/pull/38670
5179 [38712]: https://github.com/rust-lang/rust/pull/38712
5180 [38726]: https://github.com/rust-lang/rust/pull/38726
5181 [38781]: https://github.com/rust-lang/rust/pull/38781
5182 [38798]: https://github.com/rust-lang/rust/pull/38798
5183 [38909]: https://github.com/rust-lang/rust/pull/38909
5184 [38920]: https://github.com/rust-lang/rust/pull/38920
5185 [38927]: https://github.com/rust-lang/rust/pull/38927
5186 [39048]: https://github.com/rust-lang/rust/pull/39048
5187 [39282]: https://github.com/rust-lang/rust/pull/39282
5188 [39379]: https://github.com/rust-lang/rust/pull/39379
5189 [41105]: https://github.com/rust-lang/rust/issues/41105
5190 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5191 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5192 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5193 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5194 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5195 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5196 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5197 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5198 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5199 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5200 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5201 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5202 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5203 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5204 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5205 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5206 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5207 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5208 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5209 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5210 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5211 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5212 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5213 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5214 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5215 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5216 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5217 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5218 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5219 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5222 Version 1.15.1 (2017-02-09)
5223 ===========================
5225 * [Fix IntoIter::as_mut_slice's signature][39466]
5226 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5228 [39466]: https://github.com/rust-lang/rust/pull/39466
5229 [39523]: https://github.com/rust-lang/rust/pull/39523
5232 Version 1.15.0 (2017-02-02)
5233 ===========================
5238 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5239 stable. This allows popular code-generating crates like Serde and Diesel to
5240 work ergonomically. [RFC 1681].
5241 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5242 with curly braces][36868]. Part of [RFC 1506].
5243 * [A number of minor changes to name resolution have been activated][37127].
5244 They add up to more consistent semantics, allowing for future evolution of
5245 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5246 details of what is different. The breaking changes here have been transitioned
5247 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5248 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5250 * [`?Sized` can be used in `where` clauses][37791]
5251 * [There is now a limit on the size of monomorphized types and it can be
5252 modified with the `#![type_size_limit]` crate attribute, similarly to
5253 the `#![recursion_limit]` attribute][37789]
5258 * [On Windows, the compiler will apply dllimport attributes when linking to
5259 extern functions][37973]. Additional attributes and flags can control which
5260 library kind is linked and its name. [RFC 1717].
5261 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5262 * [The `--test` flag works with procedural macro crates][38107]
5263 * [Fix `extern "aapcs" fn` ABI][37814]
5264 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5265 * [The `format!` expander recognizes incorrect `printf` and shell-style
5266 formatting directives and suggests the correct format][37613].
5267 * [Only report one error for all unused imports in an import list][37456]
5269 Compiler Performance
5270 --------------------
5272 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5273 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5274 * [Don't clone in `UnificationTable::probe`][37848]
5275 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5276 * [Use small vectors in type walker][37760]
5277 * [Macro expansion performance was improved][37701]
5278 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5279 * [Replace FNV with a faster hash function][37229]
5284 * [`std::iter::Iterator::min_by`]
5285 * [`std::iter::Iterator::max_by`]
5286 * [`std::os::*::fs::FileExt`]
5287 * [`std::sync::atomic::Atomic*::get_mut`]
5288 * [`std::sync::atomic::Atomic*::into_inner`]
5289 * [`std::vec::IntoIter::as_slice`]
5290 * [`std::vec::IntoIter::as_mut_slice`]
5291 * [`std::sync::mpsc::Receiver::try_iter`]
5292 * [`std::os::unix::process::CommandExt::before_exec`]
5293 * [`std::rc::Rc::strong_count`]
5294 * [`std::rc::Rc::weak_count`]
5295 * [`std::sync::Arc::strong_count`]
5296 * [`std::sync::Arc::weak_count`]
5297 * [`std::char::encode_utf8`]
5298 * [`std::char::encode_utf16`]
5299 * [`std::cell::Ref::clone`]
5300 * [`std::io::Take::into_inner`]
5305 * [The standard sorting algorithm has been rewritten for dramatic performance
5306 improvements][38192]. It is a hybrid merge sort, drawing influences from
5307 Timsort. Previously it was a naive merge sort.
5308 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5309 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5311 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5312 and `char_indices().last()`][37882]
5313 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5314 * [Chinese characters display correctly in `fmt::Debug`][37855]
5315 * [Derive `Default` for `Duration`][37699]
5316 * [Support creation of anonymous pipes on WinXP/2k][37677]
5317 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5318 * [Don't pass overlapped handles to processes][38835]
5323 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5324 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5325 should instead check the variable at runtime with `std::env`. That the value
5326 was set at build time was a bug, and incorrect when cross-compiling. This
5327 change is known to cause breakage.
5328 * [Add `--all` flag to `cargo test`][cargo/3221]
5329 * [Compile statically against the MSVC CRT][cargo/3363]
5330 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5331 * [Link OpenSSL statically on OSX][cargo/3311]
5332 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5333 * [Test for bad path overrides with summaries][cargo/3336]
5334 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5335 * [Fix retrying crate downloads for network errors][cargo/3348]
5336 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5337 * [Emit more info on --message-format=json][cargo/3319]
5338 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5339 * [Don't ignore errors in workspace manifest][cargo/3409]
5340 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5345 * [Test runners (binaries built with `--test`) now support a `--list` argument
5346 that lists the tests it contains][38185]
5347 * [Test runners now support a `--exact` argument that makes the test filter
5348 match exactly, instead of matching only a substring of the test name][38181]
5349 * [rustdoc supports a `--playground-url` flag][37763]
5350 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5355 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5356 continue to be used in this release by passing `--disable-rustbuild` to the
5357 configure script, but they will be deleted soon. Note that the new build
5358 system uses a different on-disk layout that will likely affect any scripts
5360 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5362 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5363 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5369 * [A number of minor changes to name resolution have been activated][37127].
5370 They add up to more consistent semantics, allowing for future evolution of
5371 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5372 details of what is different. The breaking changes here have been transitioned
5373 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5374 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5375 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5376 should instead check the variable at runtime with `std::env`. That the value
5377 was set at build time was a bug, and incorrect when cross-compiling. This
5378 change is known to cause breakage.
5379 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5380 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5381 1.10 and is now an error by default. It will become a hard error in the near
5383 * [The semantics relating modules to file system directories are changing in
5384 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5385 lint, which is a warning in this release, and will become a hard error in the
5387 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5388 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5389 the underlying iterator][37834]
5391 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5392 [33685]: https://github.com/rust-lang/rust/issues/33685
5393 [36868]: https://github.com/rust-lang/rust/pull/36868
5394 [37127]: https://github.com/rust-lang/rust/pull/37127
5395 [37229]: https://github.com/rust-lang/rust/pull/37229
5396 [37456]: https://github.com/rust-lang/rust/pull/37456
5397 [37527]: https://github.com/rust-lang/rust/pull/37527
5398 [37602]: https://github.com/rust-lang/rust/pull/37602
5399 [37613]: https://github.com/rust-lang/rust/pull/37613
5400 [37615]: https://github.com/rust-lang/rust/pull/37615
5401 [37636]: https://github.com/rust-lang/rust/pull/37636
5402 [37627]: https://github.com/rust-lang/rust/pull/37627
5403 [37642]: https://github.com/rust-lang/rust/pull/37642
5404 [37677]: https://github.com/rust-lang/rust/pull/37677
5405 [37699]: https://github.com/rust-lang/rust/pull/37699
5406 [37701]: https://github.com/rust-lang/rust/pull/37701
5407 [37705]: https://github.com/rust-lang/rust/pull/37705
5408 [37749]: https://github.com/rust-lang/rust/pull/37749
5409 [37760]: https://github.com/rust-lang/rust/pull/37760
5410 [37763]: https://github.com/rust-lang/rust/pull/37763
5411 [37764]: https://github.com/rust-lang/rust/pull/37764
5412 [37789]: https://github.com/rust-lang/rust/pull/37789
5413 [37791]: https://github.com/rust-lang/rust/pull/37791
5414 [37814]: https://github.com/rust-lang/rust/pull/37814
5415 [37817]: https://github.com/rust-lang/rust/pull/37817
5416 [37834]: https://github.com/rust-lang/rust/pull/37834
5417 [37848]: https://github.com/rust-lang/rust/pull/37848
5418 [37855]: https://github.com/rust-lang/rust/pull/37855
5419 [37882]: https://github.com/rust-lang/rust/pull/37882
5420 [37888]: https://github.com/rust-lang/rust/pull/37888
5421 [37973]: https://github.com/rust-lang/rust/pull/37973
5422 [37979]: https://github.com/rust-lang/rust/pull/37979
5423 [38086]: https://github.com/rust-lang/rust/pull/38086
5424 [38107]: https://github.com/rust-lang/rust/pull/38107
5425 [38117]: https://github.com/rust-lang/rust/pull/38117
5426 [38134]: https://github.com/rust-lang/rust/pull/38134
5427 [38146]: https://github.com/rust-lang/rust/pull/38146
5428 [38181]: https://github.com/rust-lang/rust/pull/38181
5429 [38182]: https://github.com/rust-lang/rust/pull/38182
5430 [38185]: https://github.com/rust-lang/rust/pull/38185
5431 [38192]: https://github.com/rust-lang/rust/pull/38192
5432 [38279]: https://github.com/rust-lang/rust/pull/38279
5433 [38835]: https://github.com/rust-lang/rust/pull/38835
5434 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5435 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5436 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5437 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5438 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5439 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5440 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5441 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5442 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5443 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5444 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5445 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5446 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5447 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5448 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5449 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5450 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5451 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5452 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5453 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5454 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5455 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5456 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5457 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5458 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5459 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5460 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5461 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5462 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5463 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5464 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5465 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5466 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5467 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5468 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5469 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5470 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5471 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5474 Version 1.14.0 (2016-12-22)
5475 ===========================
5480 * [`..` matches multiple tuple fields in enum variants, structs
5481 and tuples][36843]. [RFC 1492].
5482 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5483 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5484 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5485 dereferencing][36822]
5490 * [Mark enums with non-zero discriminant as non-zero][37224]
5491 * [Lower-case `static mut` names are linted like other
5492 statics and consts][37162]
5493 * [Fix ICE on some macros in const integer positions
5494 (e.g. `[u8; m!()]`)][36819]
5495 * [Improve error message and snippet for "did you mean `x`"][36798]
5496 * [Add a panic-strategy field to the target specification][36794]
5497 * [Include LLVM version in `--version --verbose`][37200]
5499 Compile-time Optimizations
5500 --------------------------
5502 * [Improve macro expansion performance][37569]
5503 * [Shrink `Expr_::ExprInlineAsm`][37445]
5504 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5505 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5506 * [Avoid more allocations when compiling html5ever][37373]
5507 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5508 * [Avoid some allocations in the macro parser][37318]
5509 * [Use a faster deflate setting][37298]
5510 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5511 during interning of slices][37270]
5512 * [Optimize `write_metadata`][37267]
5513 * [Don't process obligation forest cycles when stalled][37231]
5514 * [Avoid many `CrateConfig` clones][37161]
5515 * [Optimize `Substs::super_fold_with`][37108]
5516 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5517 * [Speed up `plug_leaks`][36917]
5522 * [`println!()`, with no arguments, prints newline][36825].
5523 Previously, an empty string was required to achieve the same.
5524 * [`Wrapping` impls standard binary and unary operators, as well as
5525 the `Sum` and `Product` iterators][37356]
5526 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5528 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5529 `VecDeque` iterators][37315]
5530 * [Improve `SipHasher` performance on small values][37312]
5531 * [Add Iterator trait TrustedLen to enable better FromIterator /
5533 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5534 * [`ReadDir` implements `Debug`][37221]
5535 * [Implement `RefUnwindSafe` for atomic types][37178]
5536 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5537 * [Avoid allocations in `Decoder::read_str`][37064]
5538 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5539 * [Impl `Debug` for raw pointers to unsized data][36880]
5540 * [Don't reuse `HashMap` random seeds][37470]
5541 * [The internal memory layout of `HashMap` is more cache-friendly, for
5542 significant improvements in some operations][36692]
5543 * [`HashMap` uses less memory on 32-bit architectures][36595]
5544 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5549 * [Expose rustc cfg values to build scripts][cargo/3243]
5550 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5551 * [Fix passing --features when testing multiple packages][cargo/3280]
5552 * [Use a single profile set per workspace][cargo/3249]
5553 * [Load `replace` sections from lock files][cargo/3220]
5554 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5559 * [rustup is the recommended Rust installation method][1.14rustup]
5560 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5561 S390x. These are [tier 2] platforms and may have major defects. Follow the
5562 instructions on the website to install, or add the targets to an existing
5563 installation with `rustup target add`. The new target triples are:
5564 - `mips-unknown-linux-gnu`
5565 - `mipsel-unknown-linux-gnu`
5566 - `mips64-unknown-linux-gnuabi64`
5567 - `mips64el-unknown-linux-gnuabi64 `
5568 - `powerpc-unknown-linux-gnu`
5569 - `powerpc64-unknown-linux-gnu`
5570 - `powerpc64le-unknown-linux-gnu`
5571 - `s390x-unknown-linux-gnu `
5572 * This release includes target (std) builds for ARM Linux running MUSL
5573 libc. These are [tier 2] platforms and may have major defects. Add the
5574 following triples to an existing rustup installation with `rustup target add`:
5575 - `arm-unknown-linux-musleabi`
5576 - `arm-unknown-linux-musleabihf`
5577 - `armv7-unknown-linux-musleabihf`
5578 * This release includes [experimental support for WebAssembly][1.14wasm], via
5579 the `wasm32-unknown-emscripten` target. This target is known to have major
5580 defects. Please test, report, and fix.
5581 * rustup no longer installs documentation by default. Run `rustup
5582 component add rust-docs` to install.
5583 * [Fix line stepping in debugger][37310]
5584 * [Enable line number debuginfo in releases][37280]
5589 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5590 * [Add support for Fuchsia OS][37313]
5591 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5596 * [A number of forward-compatibility lints used by the compiler
5597 to gradually introduce language changes have been converted
5598 to deny by default][36894]:
5599 - ["use of inaccessible extern crate erroneously allowed"][36886]
5600 - ["type parameter default erroneously allowed in invalid location"][36887]
5601 - ["detects super or self keywords at the beginning of global path"][36888]
5602 - ["two overlapping inherent impls define an item with the same name
5603 were erroneously allowed"][36889]
5604 - ["floating-point constants cannot be used in patterns"][36890]
5605 - ["constants of struct or enum type can only be used in a pattern if
5606 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5607 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5608 * [Prohibit patterns in trait methods without bodies][37378]
5609 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5610 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5611 * [The `$crate` macro variable is accepted in fewer locations][37213]
5612 * [Impls specifying extra region requirements beyond the trait
5613 they implement are rejected][37167]
5614 * [Enums may not be unsized][37111]. Unsized enums are intended to
5615 work but never have. For now they are forbidden.
5616 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5618 [tier 2]: https://forge.rust-lang.org/platform-support.html
5619 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5620 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5621 [36430]: https://github.com/rust-lang/rust/pull/36430
5622 [36595]: https://github.com/rust-lang/rust/pull/36595
5623 [36595]: https://github.com/rust-lang/rust/pull/36595
5624 [36692]: https://github.com/rust-lang/rust/pull/36692
5625 [36767]: https://github.com/rust-lang/rust/pull/36767
5626 [36794]: https://github.com/rust-lang/rust/pull/36794
5627 [36798]: https://github.com/rust-lang/rust/pull/36798
5628 [36819]: https://github.com/rust-lang/rust/pull/36819
5629 [36822]: https://github.com/rust-lang/rust/pull/36822
5630 [36825]: https://github.com/rust-lang/rust/pull/36825
5631 [36843]: https://github.com/rust-lang/rust/pull/36843
5632 [36880]: https://github.com/rust-lang/rust/pull/36880
5633 [36886]: https://github.com/rust-lang/rust/issues/36886
5634 [36887]: https://github.com/rust-lang/rust/issues/36887
5635 [36888]: https://github.com/rust-lang/rust/issues/36888
5636 [36889]: https://github.com/rust-lang/rust/issues/36889
5637 [36890]: https://github.com/rust-lang/rust/issues/36890
5638 [36891]: https://github.com/rust-lang/rust/issues/36891
5639 [36892]: https://github.com/rust-lang/rust/issues/36892
5640 [36894]: https://github.com/rust-lang/rust/pull/36894
5641 [36917]: https://github.com/rust-lang/rust/pull/36917
5642 [36993]: https://github.com/rust-lang/rust/pull/36993
5643 [37037]: https://github.com/rust-lang/rust/pull/37037
5644 [37064]: https://github.com/rust-lang/rust/pull/37064
5645 [37094]: https://github.com/rust-lang/rust/pull/37094
5646 [37108]: https://github.com/rust-lang/rust/pull/37108
5647 [37111]: https://github.com/rust-lang/rust/pull/37111
5648 [37161]: https://github.com/rust-lang/rust/pull/37161
5649 [37162]: https://github.com/rust-lang/rust/pull/37162
5650 [37167]: https://github.com/rust-lang/rust/pull/37167
5651 [37178]: https://github.com/rust-lang/rust/pull/37178
5652 [37200]: https://github.com/rust-lang/rust/pull/37200
5653 [37213]: https://github.com/rust-lang/rust/pull/37213
5654 [37221]: https://github.com/rust-lang/rust/pull/37221
5655 [37224]: https://github.com/rust-lang/rust/pull/37224
5656 [37230]: https://github.com/rust-lang/rust/pull/37230
5657 [37231]: https://github.com/rust-lang/rust/pull/37231
5658 [37247]: https://github.com/rust-lang/rust/pull/37247
5659 [37267]: https://github.com/rust-lang/rust/pull/37267
5660 [37270]: https://github.com/rust-lang/rust/pull/37270
5661 [37273]: https://github.com/rust-lang/rust/pull/37273
5662 [37280]: https://github.com/rust-lang/rust/pull/37280
5663 [37298]: https://github.com/rust-lang/rust/pull/37298
5664 [37306]: https://github.com/rust-lang/rust/pull/37306
5665 [37310]: https://github.com/rust-lang/rust/pull/37310
5666 [37312]: https://github.com/rust-lang/rust/pull/37312
5667 [37313]: https://github.com/rust-lang/rust/pull/37313
5668 [37315]: https://github.com/rust-lang/rust/pull/37315
5669 [37318]: https://github.com/rust-lang/rust/pull/37318
5670 [37322]: https://github.com/rust-lang/rust/pull/37322
5671 [37326]: https://github.com/rust-lang/rust/pull/37326
5672 [37351]: https://github.com/rust-lang/rust/pull/37351
5673 [37356]: https://github.com/rust-lang/rust/pull/37356
5674 [37367]: https://github.com/rust-lang/rust/pull/37367
5675 [37373]: https://github.com/rust-lang/rust/pull/37373
5676 [37378]: https://github.com/rust-lang/rust/pull/37378
5677 [37389]: https://github.com/rust-lang/rust/pull/37389
5678 [37392]: https://github.com/rust-lang/rust/pull/37392
5679 [37427]: https://github.com/rust-lang/rust/pull/37427
5680 [37439]: https://github.com/rust-lang/rust/pull/37439
5681 [37445]: https://github.com/rust-lang/rust/pull/37445
5682 [37470]: https://github.com/rust-lang/rust/pull/37470
5683 [37569]: https://github.com/rust-lang/rust/pull/37569
5684 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5685 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5686 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5687 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5688 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5689 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5690 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5693 Version 1.13.0 (2016-11-10)
5694 ===========================
5699 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5700 errors, like the `try!` macro, described in [RFC 0243].
5701 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5702 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5703 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5704 * [Fix lifetime rules for 'if' conditions][36029]
5705 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5710 * [Add the `-C link-arg` argument][36574]
5711 * [Remove the old AST-based backend from rustc_trans][35764]
5712 * [Don't enable NEON by default on armv7 Linux][35814]
5713 * [Fix debug line number info for macro expansions][35238]
5714 * [Do not emit "class method" debuginfo for types that are not
5715 DICompositeType][36008]
5716 * [Warn about multiple conflicting #[repr] hints][34623]
5717 * [When sizing DST, don't double-count nested struct prefixes][36351]
5718 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5719 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5720 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5721 * [Expand macros without recursing to avoid stack overflows][36214]
5726 * [Replace macro backtraces with labeled local uses][35702]
5727 * [Improve error message for misplaced doc comments][33922]
5728 * [Buffer unix and lock windows to prevent message interleaving][35975]
5729 * [Update lifetime errors to specifically note temporaries][36171]
5730 * [Special case a few colors for Windows][36178]
5731 * [Suggest `use self` when such an import resolves][36289]
5732 * [Be more specific when type parameter shadows primitive type][36338]
5733 * Many minor improvements
5735 Compile-time Optimizations
5736 --------------------------
5738 * [Compute and cache HIR hashes at beginning][35854]
5739 * [Don't hash types in loan paths][36004]
5740 * [Cache projections in trans][35761]
5741 * [Optimize the parser's last token handling][36527]
5742 * [Only instantiate #[inline] functions in codegen units referencing
5743 them][36524]. This leads to big improvements in cases where crates export
5744 define many inline functions without using them directly.
5745 * [Lazily allocate TypedArena's first chunk][36592]
5746 * [Don't allocate during default HashSet creation][36734]
5753 * [`overflowing_abs`]
5754 * [`RefCell::try_borrow`]
5755 * [`RefCell::try_borrow_mut`]
5760 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5761 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5763 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5764 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5765 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5766 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5767 * [Use arc4rand on FreeBSD][35884]
5768 * [memrchr: Correct aligned offset computation][35969]
5769 * [Improve Demangling of Rust Symbols][36059]
5770 * [Use monotonic time in condition variables][35048]
5771 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5772 * [Implement conversion traits for `char`][35755]
5773 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5774 * [Zero first byte of CString on drop][36264]
5775 * [Inherit overflow checks for sum and product][36372]
5776 * [Add missing Eq implementations][36423]
5777 * [Implement `Debug` for `DirEntry`][36631]
5778 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5780 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5781 * [Implement more traits for `std::io::ErrorKind`][35911]
5782 * [Optimize BinaryHeap bounds checking][36072]
5783 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5784 `extend_with_element`][36355]
5785 * [Fix overflow checking in unsigned pow()][34942]
5790 * This release includes security fixes to both curl and OpenSSL.
5791 * [Fix transitive doctests when panic=abort][cargo/3021]
5792 * [Add --all-features flag to cargo][cargo/3038]
5793 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5794 * [Don't parse the home directory more than once][cargo/3078]
5795 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5796 * [Update OpenSSL to 1.0.2j][cargo/3121]
5797 * [Add license and license_file to cargo metadata output][cargo/3110]
5798 * [Make crates-io registry URL optional in config; ignore all changes to
5799 source.crates-io][cargo/3089]
5800 * [Don't download dependencies from other platforms][cargo/3123]
5801 * [Build transitive dev-dependencies when needed][cargo/3125]
5802 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5803 * [Avoid updating registry when adding existing deps][cargo/3144]
5804 * [Warn about path overrides that won't work][cargo/3136]
5805 * [Use workspaces during `cargo install`][cargo/3146]
5806 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5807 * [Add --message-format flag][cargo/3000]
5808 * [Pass target environment for rustdoc][cargo/3205]
5809 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5810 * [Update curl and curl-sys][cargo/3241]
5811 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5816 * [rustdoc: Add the `--sysroot` argument][36586]
5817 * [rustdoc: Fix a couple of issues with the search results][35655]
5818 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5819 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5820 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5825 * [Remove unmaintained style guide][35124]
5826 * [Add s390x support][36369]
5827 * [Initial work at Haiku OS support][36727]
5828 * [Add mips-uclibc targets][35734]
5829 * [Crate-ify compiler-rt into compiler-builtins][35021]
5830 * [Add rustc version info (git hash + date) to dist tarball][36213]
5831 * Many documentation improvements
5836 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5837 * [Deny (by default) transmuting from fn item types to pointer-sized
5838 types][34923]. Continuing the long transition to zero-sized fn items,
5840 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5842 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5843 * [Fix lifetime rules for 'if' conditions][36029].
5844 * [Inherit overflow checks for sum and product][36372].
5845 * [Forbid user-defined macros named "macro_rules"][36730].
5847 [33922]: https://github.com/rust-lang/rust/pull/33922
5848 [34623]: https://github.com/rust-lang/rust/pull/34623
5849 [34923]: https://github.com/rust-lang/rust/pull/34923
5850 [34942]: https://github.com/rust-lang/rust/pull/34942
5851 [34982]: https://github.com/rust-lang/rust/pull/34982
5852 [35021]: https://github.com/rust-lang/rust/pull/35021
5853 [35048]: https://github.com/rust-lang/rust/pull/35048
5854 [35074]: https://github.com/rust-lang/rust/pull/35074
5855 [35124]: https://github.com/rust-lang/rust/pull/35124
5856 [35234]: https://github.com/rust-lang/rust/pull/35234
5857 [35238]: https://github.com/rust-lang/rust/pull/35238
5858 [35354]: https://github.com/rust-lang/rust/pull/35354
5859 [35559]: https://github.com/rust-lang/rust/pull/35559
5860 [35585]: https://github.com/rust-lang/rust/pull/35585
5861 [35627]: https://github.com/rust-lang/rust/pull/35627
5862 [35655]: https://github.com/rust-lang/rust/pull/35655
5863 [35702]: https://github.com/rust-lang/rust/pull/35702
5864 [35707]: https://github.com/rust-lang/rust/pull/35707
5865 [35728]: https://github.com/rust-lang/rust/pull/35728
5866 [35734]: https://github.com/rust-lang/rust/pull/35734
5867 [35755]: https://github.com/rust-lang/rust/pull/35755
5868 [35761]: https://github.com/rust-lang/rust/pull/35761
5869 [35764]: https://github.com/rust-lang/rust/pull/35764
5870 [35814]: https://github.com/rust-lang/rust/pull/35814
5871 [35854]: https://github.com/rust-lang/rust/pull/35854
5872 [35871]: https://github.com/rust-lang/rust/pull/35871
5873 [35884]: https://github.com/rust-lang/rust/pull/35884
5874 [35911]: https://github.com/rust-lang/rust/pull/35911
5875 [35969]: https://github.com/rust-lang/rust/pull/35969
5876 [35975]: https://github.com/rust-lang/rust/pull/35975
5877 [36004]: https://github.com/rust-lang/rust/pull/36004
5878 [36008]: https://github.com/rust-lang/rust/pull/36008
5879 [36014]: https://github.com/rust-lang/rust/pull/36014
5880 [36029]: https://github.com/rust-lang/rust/pull/36029
5881 [36059]: https://github.com/rust-lang/rust/pull/36059
5882 [36072]: https://github.com/rust-lang/rust/pull/36072
5883 [36101]: https://github.com/rust-lang/rust/pull/36101
5884 [36104]: https://github.com/rust-lang/rust/pull/36104
5885 [36171]: https://github.com/rust-lang/rust/pull/36171
5886 [36173]: https://github.com/rust-lang/rust/pull/36173
5887 [36178]: https://github.com/rust-lang/rust/pull/36178
5888 [36213]: https://github.com/rust-lang/rust/pull/36213
5889 [36214]: https://github.com/rust-lang/rust/pull/36214
5890 [36264]: https://github.com/rust-lang/rust/pull/36264
5891 [36266]: https://github.com/rust-lang/rust/pull/36266
5892 [36289]: https://github.com/rust-lang/rust/pull/36289
5893 [36338]: https://github.com/rust-lang/rust/pull/36338
5894 [36351]: https://github.com/rust-lang/rust/pull/36351
5895 [36355]: https://github.com/rust-lang/rust/pull/36355
5896 [36369]: https://github.com/rust-lang/rust/pull/36369
5897 [36372]: https://github.com/rust-lang/rust/pull/36372
5898 [36423]: https://github.com/rust-lang/rust/pull/36423
5899 [36482]: https://github.com/rust-lang/rust/pull/36482
5900 [36505]: https://github.com/rust-lang/rust/pull/36505
5901 [36524]: https://github.com/rust-lang/rust/pull/36524
5902 [36527]: https://github.com/rust-lang/rust/pull/36527
5903 [36551]: https://github.com/rust-lang/rust/pull/36551
5904 [36574]: https://github.com/rust-lang/rust/pull/36574
5905 [36586]: https://github.com/rust-lang/rust/pull/36586
5906 [36592]: https://github.com/rust-lang/rust/pull/36592
5907 [36631]: https://github.com/rust-lang/rust/pull/36631
5908 [36639]: https://github.com/rust-lang/rust/pull/36639
5909 [36721]: https://github.com/rust-lang/rust/pull/36721
5910 [36727]: https://github.com/rust-lang/rust/pull/36727
5911 [36730]: https://github.com/rust-lang/rust/pull/36730
5912 [36734]: https://github.com/rust-lang/rust/pull/36734
5913 [36754]: https://github.com/rust-lang/rust/pull/36754
5914 [36995]: https://github.com/rust-lang/rust/pull/36995
5915 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5916 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5917 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5918 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5919 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5920 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5921 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5922 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5923 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5924 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5925 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5926 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5927 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5928 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5929 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5930 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5931 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5932 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5933 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5934 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5935 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5936 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5937 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5938 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5939 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5940 [rustup]: https://www.rustup.rs
5941 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5942 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5943 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5944 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5945 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5946 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5947 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5950 Version 1.12.1 (2016-10-20)
5951 ===========================
5956 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5957 * [Confusion with double negation and booleans][36856]
5958 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5959 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5960 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5961 * [Corrupted memory after updated to 1.12][36936]
5962 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5963 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5964 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5966 [36381]: https://github.com/rust-lang/rust/issues/36381
5967 [36856]: https://github.com/rust-lang/rust/issues/36856
5968 [36875]: https://github.com/rust-lang/rust/issues/36875
5969 [36924]: https://github.com/rust-lang/rust/issues/36924
5970 [36926]: https://github.com/rust-lang/rust/issues/36926
5971 [36936]: https://github.com/rust-lang/rust/issues/36936
5972 [37026]: https://github.com/rust-lang/rust/issues/37026
5973 [37112]: https://github.com/rust-lang/rust/issues/37112
5974 [37153]: https://github.com/rust-lang/rust/issues/37153
5977 Version 1.12.0 (2016-09-29)
5978 ===========================
5983 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5984 This translation pass is far simpler than the previous AST->LLVM pass, and
5985 creates opportunities to perform new optimizations directly on the MIR. It
5986 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5987 * [`rustc` presents a new, more readable error format, along with
5988 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5989 Most common editors supporting Rust have been updated to work with it. It was
5990 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5995 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5996 This translation pass is far simpler than the previous AST->LLVM pass, and
5997 creates opportunities to perform new optimizations directly on the MIR. It
5998 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5999 * [Print the Rust target name, not the LLVM target name, with
6000 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6001 * [The computation of `TypeId` is correct in some cases where it was previously
6002 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6003 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6004 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6005 `--print relocation-models`, and `--print code-models` print the available
6006 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6007 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6008 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6009 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6010 These targets produce statically-linked binaries. There are no binary release
6016 * [`rustc` presents a new, more readable error format, along with
6017 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6018 Most common editors supporting Rust have been updated to work with it. It was
6019 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6020 * [In error descriptions, references are now described in plain English,
6021 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6022 * [In error type descriptions, unknown numeric types are named `{integer}` or
6023 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6024 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6029 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6030 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6031 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6032 useful](https://github.com/rust-lang/rust/pull/34908)
6033 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6034 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6035 * [Semicolons are properly required as statement delimiters inside
6036 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6037 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6042 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6043 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6044 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6045 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6046 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6047 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6048 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6049 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6050 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6051 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6052 Both on Unix and Windows.
6053 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6054 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6055 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6056 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6057 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6058 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6059 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6060 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6065 * [The `format!` macro and friends now allow a single argument to be formatted
6066 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6067 * [The lifetime bounds on `[T]::binary_search_by` and
6068 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6069 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6070 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6071 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6072 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6073 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6074 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6075 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6076 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6077 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6078 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6079 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6080 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6081 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6082 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6083 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6084 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6085 * [`mpsc::sync_channel` `Receiver`s return any available message before
6086 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6087 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6088 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6093 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6094 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6095 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6096 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6097 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6098 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6099 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6100 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6101 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6102 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6103 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6104 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6105 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6106 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6107 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6108 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6113 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6114 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6119 * [Test binaries now support a `--test-threads` argument to specify the number
6120 of threads used to run tests, and which acts the same as the
6121 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6122 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6123 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6124 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6125 * [Rust releases now come with source packages that can be installed by rustup
6126 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6127 The resulting source code can be used by tools and IDES, located in the
6128 sysroot under `lib/rustlib/src`.
6133 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6134 * Many minor improvements to the documentation.
6135 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6140 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6141 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6142 * [When formatting strings, if "precision" is specified, the "fill",
6143 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6144 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6147 Version 1.11.0 (2016-08-18)
6148 ===========================
6153 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6154 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6155 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6156 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6161 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6162 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6163 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6164 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6165 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6166 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6167 (in libcore - previously stabilized in libstd)
6168 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6169 (in libcore - previously stabilized in libstd)
6170 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6171 (in libcore - previously stabilized in libstd)
6172 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6173 (in libcore - previously stabilized in libstd)
6174 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6175 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6176 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6177 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6182 * [The `thread_local!` macro supports multiple definitions in a single
6183 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6184 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6185 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6186 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6187 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6188 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6189 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6190 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6195 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6196 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6197 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6198 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6199 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6200 and `-vv` prints warnings for all crates.
6201 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6202 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6203 This provides room for expansion by arbitrary tools.
6204 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6205 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6206 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6207 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6208 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6209 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6210 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6215 * [Caching projections speeds up type check dramatically for some
6216 workloads](https://github.com/rust-lang/rust/pull/33816)
6217 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6218 This hasher is faster, but is believed to provide sufficient
6219 protection from collision attacks.
6220 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6225 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6226 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6227 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6228 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6229 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6234 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6235 * [When emitting debug info, rustc emits frame pointers for closures,
6236 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6237 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6238 * Many more errors have been given error codes and extended
6240 * API documentation continues to be improved, with many new examples
6245 * [rustc no longer hangs when dependencies recursively re-export
6246 submodules](https://github.com/rust-lang/rust/pull/34542)
6247 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6248 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6249 rewritten](https://github.com/rust-lang/rust/pull/33895)
6250 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6251 No targets use this yet, but it works toward AVR support.
6256 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6257 * [The new follow-set rules that place restrictions on `macro_rules!`
6258 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6259 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6260 and has been a warning since 1.10.
6261 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6262 This causes breakage in some corner cases.
6265 Version 1.10.0 (2016-07-07)
6266 ===========================
6271 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6272 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6273 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6274 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6275 * [`panic!` can be converted to a runtime abort with the
6276 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6277 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6278 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6279 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6280 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6281 Note that Cargo does not yet directly support cdylibs.
6286 * `os::windows::fs::OpenOptionsExt::access_mode`
6287 * `os::windows::fs::OpenOptionsExt::share_mode`
6288 * `os::windows::fs::OpenOptionsExt::custom_flags`
6289 * `os::windows::fs::OpenOptionsExt::attributes`
6290 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6291 * `os::unix::fs::OpenOptionsExt::custom_flags`
6292 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6293 * `Default for sync::Weak`
6294 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6295 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6296 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6297 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6298 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6299 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6300 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6301 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6302 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6303 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6304 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6305 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6306 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6307 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6308 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6309 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6310 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6311 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6312 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6313 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6314 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6315 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6316 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6317 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6318 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6319 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6320 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6321 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6322 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6323 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6324 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6325 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6326 * Read/Write/RawFd impls for `UnixStream`
6327 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6328 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6329 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6330 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6331 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6332 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6333 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6334 * RawFd impls for `UnixListener`
6335 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6336 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6337 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6338 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6339 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6340 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6341 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6342 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6343 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6344 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6345 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6346 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6347 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6348 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6349 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6350 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6351 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6352 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6353 * RawFd impls for `UnixDatagram`
6354 * `{BTree,Hash}Map::values_mut`
6355 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6360 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6361 The semantics of this minor method are subtle and probably not what
6363 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6364 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6365 will fall back to `/dev/urandom` temporarily to avoid blocking
6366 during early boot](https://github.com/rust-lang/rust/pull/33086).
6367 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6368 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6369 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6370 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6371 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6372 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6373 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6377 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6378 This controls the runtime behavior of the `panic!` macro
6379 and can be either "unwind" (the default), or "abort".
6380 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6381 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6382 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6383 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6384 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6385 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6386 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6387 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6388 By default they are retried twice, which can be customized with the
6389 `net.retry` value in `.cargo/config`.
6390 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6391 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6392 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6393 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6394 Makes it possible to install multiple crates in parallel.
6395 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6396 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6397 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6398 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6399 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6400 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6405 * [rustc memory usage was reduced by refactoring the context used for
6406 type checking](https://github.com/rust-lang/rust/pull/33425).
6407 * [Speed up creation of `HashMap`s by caching the random keys used
6408 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6409 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6410 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6411 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6412 10x faster than the previous lookup tables.
6413 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6418 * Many incremental improvements to documentation and rustdoc.
6419 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6420 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6421 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6422 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6423 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6424 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6425 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6430 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6431 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6432 * [`std` no longer prints backtraces on platforms where the running
6433 module must be loaded with `env::current_exe`, which can't be relied
6434 on](https://github.com/rust-lang/rust/pull/33554).
6435 * This release includes std binaries for the i586-unknown-linux-gnu,
6436 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6437 i586 target is for old x86 hardware without SSE2, and the armv7
6438 target is for Android running on modern ARM architectures.
6439 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6440 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6441 * [On Unix the runtime aborts by calling `libc::abort` instead of
6442 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6443 * [Rust is now bootstrapped from the previous release of Rust,
6444 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6449 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6450 * [`target_env` for Linux ARM targets is just `gnu`, not
6451 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6452 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6453 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6454 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6455 Affects how macros are parsed.
6456 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6457 * [Feature-gated attributes on macro-generated macro invocations are
6458 now rejected](https://github.com/rust-lang/rust/pull/32791).
6459 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6460 This caused some minor changes to type inference.
6463 Version 1.9.0 (2016-05-26)
6464 ==========================
6469 * The `#[deprecated]` attribute when applied to an API will generate
6470 warnings when used. The warnings may be suppressed with
6471 `#[allow(deprecated)]`. [RFC 1270].
6472 * [`fn` item types are zero sized, and each `fn` names a unique
6473 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6474 `transmute` on a `fn` type will generate a warning for a few cycles,
6475 then will be converted to an error.
6476 * [Field and method resolution understand visibility, so private
6477 fields and methods cannot prevent the proper use of public fields
6478 and methods][1.9fv].
6479 * [The parser considers unicode codepoints in the
6480 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6486 * [`std::panic::catch_unwind`] (renamed from `recover`)
6487 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6488 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6489 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6490 * [`str::is_char_boundary`]
6491 * [`<*const T>::as_ref`]
6492 * [`<*mut T>::as_ref`]
6493 * [`<*mut T>::as_mut`]
6494 * [`AsciiExt::make_ascii_uppercase`]
6495 * [`AsciiExt::make_ascii_lowercase`]
6496 * [`char::decode_utf16`]
6497 * [`char::DecodeUtf16`]
6498 * [`char::DecodeUtf16Error`]
6499 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6500 * [`BTreeSet::take`]
6501 * [`BTreeSet::replace`]
6504 * [`HashSet::replace`]
6506 * [`OsString::with_capacity`]
6507 * [`OsString::clear`]
6508 * [`OsString::capacity`]
6509 * [`OsString::reserve`]
6510 * [`OsString::reserve_exact`]
6511 * [`OsStr::is_empty`]
6513 * [`std::os::unix::thread`]
6516 * [`JoinHandleExt::as_pthread_t`]
6517 * [`JoinHandleExt::into_pthread_t`]
6518 * [`HashSet::hasher`]
6519 * [`HashMap::hasher`]
6520 * [`CommandExt::exec`]
6521 * [`File::try_clone`]
6522 * [`SocketAddr::set_ip`]
6523 * [`SocketAddr::set_port`]
6524 * [`SocketAddrV4::set_ip`]
6525 * [`SocketAddrV4::set_port`]
6526 * [`SocketAddrV6::set_ip`]
6527 * [`SocketAddrV6::set_port`]
6528 * [`SocketAddrV6::set_flowinfo`]
6529 * [`SocketAddrV6::set_scope_id`]
6530 * [`slice::copy_from_slice`]
6531 * [`ptr::read_volatile`]
6532 * [`ptr::write_volatile`]
6533 * [`OpenOptions::create_new`]
6534 * [`TcpStream::set_nodelay`]
6535 * [`TcpStream::nodelay`]
6536 * [`TcpStream::set_ttl`]
6537 * [`TcpStream::ttl`]
6538 * [`TcpStream::set_only_v6`]
6539 * [`TcpStream::only_v6`]
6540 * [`TcpStream::take_error`]
6541 * [`TcpStream::set_nonblocking`]
6542 * [`TcpListener::set_ttl`]
6543 * [`TcpListener::ttl`]
6544 * [`TcpListener::set_only_v6`]
6545 * [`TcpListener::only_v6`]
6546 * [`TcpListener::take_error`]
6547 * [`TcpListener::set_nonblocking`]
6548 * [`UdpSocket::set_broadcast`]
6549 * [`UdpSocket::broadcast`]
6550 * [`UdpSocket::set_multicast_loop_v4`]
6551 * [`UdpSocket::multicast_loop_v4`]
6552 * [`UdpSocket::set_multicast_ttl_v4`]
6553 * [`UdpSocket::multicast_ttl_v4`]
6554 * [`UdpSocket::set_multicast_loop_v6`]
6555 * [`UdpSocket::multicast_loop_v6`]
6556 * [`UdpSocket::set_multicast_ttl_v6`]
6557 * [`UdpSocket::multicast_ttl_v6`]
6558 * [`UdpSocket::set_ttl`]
6559 * [`UdpSocket::ttl`]
6560 * [`UdpSocket::set_only_v6`]
6561 * [`UdpSocket::only_v6`]
6562 * [`UdpSocket::join_multicast_v4`]
6563 * [`UdpSocket::join_multicast_v6`]
6564 * [`UdpSocket::leave_multicast_v4`]
6565 * [`UdpSocket::leave_multicast_v6`]
6566 * [`UdpSocket::take_error`]
6567 * [`UdpSocket::connect`]
6568 * [`UdpSocket::send`]
6569 * [`UdpSocket::recv`]
6570 * [`UdpSocket::set_nonblocking`]
6575 * [`std::sync::Once` is poisoned if its initialization function
6577 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6578 * [Most types implement `fmt::Debug`][1.9db].
6579 * [The default buffer size used by `BufReader` and `BufWriter` was
6580 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6581 used by other languages.
6582 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6583 `Duration` additionally implements `*=` and `/=`][1.9ta].
6584 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6585 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6586 * [`Chain` implements `BufRead`][1.9ch].
6587 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6592 * [Cargo can now run concurrently][1.9cc].
6593 * [Top-level overrides allow specific revisions of crates to be
6594 overridden through the entire crate graph][1.9ct]. This is intended
6595 to make upgrades easier for large projects, by allowing crates to be
6596 forked temporarily until they've been upgraded and republished.
6597 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6598 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6599 on the commandline][1.9cf]. `rustc` arguments can also be specified
6600 in the `build.rustflags` configuration key.
6605 * [The time complexity of comparing variables for equivalence during type
6606 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6607 to major compilation time improvement in some scenarios.
6608 * [`ToString` is specialized for `str`, giving it the same performance
6609 as `to_owned`][1.9ts].
6610 * [Spawning processes with `Command::output` no longer creates extra
6612 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6613 for C-like enums][1.9cl].
6618 * [Passing the `--quiet` flag to a test runner will produce
6619 much-abbreviated output][1.9q].
6620 * The Rust Project now publishes std binaries for the
6621 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6622 `i586-pc-windows-msvc` targets.
6627 * [`std::sync::Once` is poisoned if its initialization function
6629 * [It is illegal to define methods with the same name in overlapping
6630 inherent `impl` blocks][1.9sn].
6631 * [`fn` item types are zero sized, and each `fn` names a unique
6632 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6633 `transmute` on a `fn` type will generate a warning for a few cycles,
6634 then will be converted to an error.
6635 * [Improvements to const evaluation may trigger new errors when integer
6636 literals are out of range][1.9ce].
6639 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6640 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6641 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6642 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6643 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6644 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6645 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6646 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6647 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6648 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6649 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6650 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6651 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6652 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6653 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6654 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6655 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6656 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6657 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6658 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6659 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6660 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6661 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6662 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6663 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6664 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6665 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6666 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6667 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6668 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6669 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6670 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6671 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6672 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6673 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6674 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6675 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6676 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6677 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6678 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6679 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6680 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6681 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6682 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6683 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6684 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6685 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6686 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6687 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6688 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6689 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6690 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6691 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6692 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6693 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6694 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6695 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6696 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6697 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6698 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6699 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6700 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6701 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6702 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6703 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6704 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6705 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6706 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6707 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6708 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6709 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6710 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6711 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6712 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6713 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6714 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6715 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6716 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6717 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6718 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6719 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6720 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6721 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6722 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6723 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6724 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6725 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6726 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6727 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6728 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6729 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6730 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6731 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6732 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6733 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6734 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6735 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6736 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6737 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6738 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6739 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6740 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6741 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6742 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6743 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6744 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6745 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6746 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6747 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6748 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6751 Version 1.8.0 (2016-04-14)
6752 ==========================
6757 * Rust supports overloading of compound assignment statements like
6758 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6759 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6760 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6762 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6763 addition to the non-braced form, `struct Foo;`. [RFC 218].
6769 * [`str::encode_utf16`] (renamed from `utf16_units`)
6770 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6773 * [`ptr::drop_in_place`]
6775 * [`time::SystemTime`]
6777 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6778 * [`Instant::elapsed`]
6779 * [`SystemTime::now`]
6780 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6781 * [`SystemTime::elapsed`]
6782 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6783 * [`SystemTimeError`]
6784 * [`SystemTimeError::duration`]
6785 * Various impls for `SystemTimeError`
6787 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6788 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6789 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6790 * [The `write!` and `writeln!` macros correctly emit errors if any of
6791 their arguments can't be formatted][1.8w].
6792 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6793 * [The Unix-specific `raw` modules, which contain a number of
6794 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6795 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6796 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6797 across platforms was making it difficult to implement `std`
6798 correctly. Those that need these definitions should use the `libc`
6800 * The Unix-specific `MetadataExt` traits, including
6801 `os::unix::fs::MetadataExt`, which expose values such as inode
6802 numbers [no longer return platform-specific types][1.8r], but
6803 instead return widened integers. [RFC 1415].
6804 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6805 * [Atomic loads and stores are not volatile][1.8a].
6806 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6811 * [Inlining hash functions lead to a 3% compile-time improvement in
6812 some workloads][1.8h].
6813 * When using jemalloc, its symbols are [unprefixed so that it
6814 overrides the libc malloc implementation][1.8h]. This means that for
6815 rustc, LLVM is now using jemalloc, which results in a 6%
6816 compile-time improvement on a specific workload.
6817 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6822 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6823 i686-pc-windows-msvc is now considered a tier-1 platform.
6824 * [The `--print targets` flag prints a list of supported targets][1.8t].
6825 * [The `--print cfg` flag prints the `cfg`s defined for the current
6827 * [`rustc` can be built with an new Cargo-based build system, written
6828 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6829 build system. To enable it configure with `configure --rustbuild`.
6830 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6831 variants while also indicating the total number of missing variants
6832 if more than 3][1.8m].
6833 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6834 * The Rust Project now publishes binary releases of the standard
6835 library for a number of tier-2 targets:
6836 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6837 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6838 `x86_64-rumprun-netbsd`. These can be installed with
6839 tools such as [multirust][1.8mr].
6844 * [`cargo init` creates a new Cargo project in the current
6845 directory][1.8ci]. It is otherwise like `cargo new`.
6846 * [Cargo has configuration keys for `-v` and
6847 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6848 `[term]` section of `.cargo/config`.
6849 * [Configuration keys that evaluate to strings or integers can be set
6850 via environment variables][1.8ce]. For example the `build.jobs` key
6851 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6852 precedence over config files.
6853 * [Target-specific dependencies support Rust `cfg` syntax for
6854 describing targets][1.8cfg] so that dependencies for multiple
6855 targets can be specified together. [RFC 1361].
6856 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6857 `RUSTDOC` take precedence over the `build.target-dir`,
6858 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6859 * [The child process tree is killed on Windows when Cargo is
6861 * [The `build.target` configuration value sets the target platform,
6862 like `--target`][1.8ct].
6867 * [Unstable compiler flags have been further restricted][1.8u]. Since
6868 1.0 `-Z` flags have been considered unstable, and other flags that
6869 were considered unstable additionally required passing `-Z
6870 unstable-options` to access. Unlike unstable language and library
6871 features though, these options have been accessible on the stable
6872 release channel. Going forward, *new unstable flags will not be
6873 available on the stable release channel*, and old unstable flags
6874 will warn about their usage. In the future, all unstable flags will
6875 be unavailable on the stable release channel.
6876 * [It is no longer possible to `match` on empty enum variants using
6877 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6878 * The Unix-specific `MetadataExt` traits, including
6879 `os::unix::fs::MetadataExt`, which expose values such as inode
6880 numbers [no longer return platform-specific types][1.8r], but
6881 instead return widened integers. [RFC 1415].
6882 * [Modules sourced from the filesystem cannot appear within arbitrary
6883 blocks, but only within other modules][1.8mf].
6884 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6885 * On Unix, [stack overflow triggers a runtime abort instead of a
6887 * [`Command::spawn` and its equivalents return an error if any of
6888 its command-line arguments contain interior `NUL`s][1.8n].
6889 * [Tuple and unit enum variants from other crates are in the type
6891 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6892 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6893 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6894 instead of `foo.lib`.
6897 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6898 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6899 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6900 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6901 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6902 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6903 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6904 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6905 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6906 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6907 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6908 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6909 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6910 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6911 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6912 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6913 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6914 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6915 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6916 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6917 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6918 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6919 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6920 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6921 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6922 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6923 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6924 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6925 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6926 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6927 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6928 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6929 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6930 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6931 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6932 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6933 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6934 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6935 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6936 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6937 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6938 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6939 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6940 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6941 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6942 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6943 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6944 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6945 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6946 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6947 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6948 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6949 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6950 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6951 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6952 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6953 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6954 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6955 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6956 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6959 Version 1.7.0 (2016-03-03)
6960 ==========================
6967 * [`Path::strip_prefix`] (renamed from relative_from)
6968 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6970 * [`Ipv4Addr::is_loopback`]
6971 * [`Ipv4Addr::is_private`]
6972 * [`Ipv4Addr::is_link_local`]
6973 * [`Ipv4Addr::is_multicast`]
6974 * [`Ipv4Addr::is_broadcast`]
6975 * [`Ipv4Addr::is_documentation`]
6977 * [`Ipv6Addr::is_unspecified`]
6978 * [`Ipv6Addr::is_loopback`]
6979 * [`Ipv6Addr::is_multicast`]
6982 * [`Vec::as_mut_slice`]
6984 * [`String::as_str`]
6985 * [`String::as_mut_str`]
6987 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6989 * `<[T]>::`[`sort_by_key`]
6990 * checked, saturated, and overflowing operations
6991 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6992 * [`i32::saturating_mul`]
6993 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6994 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6995 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6996 * [`u32::saturating_mul`]
6997 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6998 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6999 * and checked, saturated, and overflowing operations for other primitive types
7001 * [`ffi::IntoStringError`]
7002 * [`CString::into_string`]
7003 * [`CString::into_bytes`]
7004 * [`CString::into_bytes_with_nul`]
7005 * `From<CString> for Vec<u8>`
7007 * [`IntoStringError::into_cstring`]
7008 * [`IntoStringError::utf8_error`]
7009 * `Error for IntoStringError`
7011 * [`std::hash::BuildHasher`]
7012 * [`BuildHasher::Hasher`]
7013 * [`BuildHasher::build_hasher`]
7014 * [`std::hash::BuildHasherDefault`]
7015 * [`HashMap::with_hasher`]
7016 * [`HashMap::with_capacity_and_hasher`]
7017 * [`HashSet::with_hasher`]
7018 * [`HashSet::with_capacity_and_hasher`]
7019 * [`std::collections::hash_map::RandomState`]
7020 * [`RandomState::new`]
7021 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7022 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7023 from bytes is faster.
7024 * [The performance of `LineWriter` (and thus `io::stdout`) was
7025 improved by using `memchr` to search for newlines][1.7m].
7026 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7027 `f64` variants were stabilized previously.
7028 * [`BTreeMap` was rewritten to use less memory and improve the performance
7029 of insertion and iteration, the latter by as much as 5x][1.7bm].
7030 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7031 covariant over their contained type][1.7bt].
7032 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7033 over their contained type][1.7ll].
7034 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7036 * [`Any` is implemented for unsized types][1.7a].
7037 * [`Hash` is implemented for `Duration`][1.7h].
7042 * [When running tests with `--test`, rustdoc will pass `--cfg`
7043 arguments to the compiler][1.7dt].
7044 * [The compiler is built with RPATH information by default][1.7rpa].
7045 This means that it will be possible to run `rustc` when installed in
7046 unusual configurations without configuring the dynamic linker search
7048 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7049 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7050 over `LD_LIBRARY_PATH`.
7055 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7056 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7057 * [The `rerun-if-changed` build script directive no longer causes the
7058 build script to incorrectly run twice in certain scenarios][1.7rr].
7063 * Soundness fixes to the interactions between associated types and
7064 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7065 code that violates the new rules. This is a significant change that
7066 is known to break existing code, so it has emitted warnings for the
7067 new error cases since 1.4 to give crate authors time to adapt. The
7068 details of what is changing are subtle; read the RFC for more.
7069 * [Several bugs in the compiler's visibility calculations were
7070 fixed][1.7v]. Since this was found to break significant amounts of
7071 code, the new errors will be emitted as warnings for several release
7072 cycles, under the `private_in_public` lint.
7073 * Defaulted type parameters were accidentally accepted in positions
7074 that were not intended. In this release, [defaulted type parameters
7075 appearing outside of type definitions will generate a
7076 warning][1.7d], which will become an error in future releases.
7077 * [Parsing "." as a float results in an error instead of 0][1.7p].
7078 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7079 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7081 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7082 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7083 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7084 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7085 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7086 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7087 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7088 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7089 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7090 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7091 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7092 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7093 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7094 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7095 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7096 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7097 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7098 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7099 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7100 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7101 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7102 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7103 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7104 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7105 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7106 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7107 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7108 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7109 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7110 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7111 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7112 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7113 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7114 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7115 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7116 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7117 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7118 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7119 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7120 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7121 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7122 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7123 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7124 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7125 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7126 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7127 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7128 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7129 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7130 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7131 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7132 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7133 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7134 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7135 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7136 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7137 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7138 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7139 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7140 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7141 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7142 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7143 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7144 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7145 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7146 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7147 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7148 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7149 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7150 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7151 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7152 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7153 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7154 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7155 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7156 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7157 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7158 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7159 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7162 Version 1.6.0 (2016-01-21)
7163 ==========================
7168 * The `#![no_std]` attribute causes a crate to not be linked to the
7169 standard library, but only the [core library][1.6co], as described
7170 in [RFC 1184]. The core library defines common types and traits but
7171 has no platform dependencies whatsoever, and is the basis for Rust
7172 software in environments that cannot support a full port of the
7173 standard library, such as operating systems. Most of the core
7174 library is now stable.
7180 [`Read::read_exact`],
7181 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7182 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7183 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7184 [`os::unix::fs::DirBuilderExt`],
7185 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7186 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7187 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7188 [`collections::hash_map::Drain`],
7189 [`collections::hash_map::HashMap::drain`],
7190 [`collections::hash_set::Drain`],
7191 [`collections::hash_set::HashSet::drain`],
7192 [`collections::binary_heap::Drain`],
7193 [`collections::binary_heap::BinaryHeap::drain`],
7194 [`Vec::extend_from_slice`] (renamed from `push_all`),
7195 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7196 [`RwLock::into_inner`],
7197 [`Iterator::min_by_key`] (renamed from `min_by`),
7198 [`Iterator::max_by_key`] (renamed from `max_by`).
7199 * The [core library][1.6co] is stable, as are most of its APIs.
7200 * [The `assert_eq!` macro supports arguments that don't implement
7201 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7203 * Several timer functions that take duration in milliseconds [are
7204 deprecated in favor of those that take `Duration`][1.6ms]. These
7205 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7206 `thread::park_timeout_ms`.
7207 * The algorithm by which `Vec` reserves additional elements was
7208 [tweaked to not allocate excessive space][1.6a] while still growing
7210 * `From` conversions are [implemented from integers to floats][1.6f]
7211 in cases where the conversion is lossless. Thus they are not
7212 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7213 or `f64`. They are also not implemented for `isize` and `usize`
7214 because the implementations would be platform-specific. `From` is
7215 also implemented from `f32` to `f64`.
7216 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7217 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7218 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7219 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7221 * Sorting slices that are already sorted [is 50% faster in some
7227 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7228 * Cargo build scripts can specify their dependencies by emitting the
7229 [`rerun-if-changed`][1.6rr] key.
7230 * crates.io will reject publication of crates with dependencies that
7231 have a wildcard version constraint. Crates with wildcard
7232 dependencies were seen to cause a variety of problems, as described
7233 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7235 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7236 release folder. A variety of artifacts that Cargo failed to clean
7237 are now correctly deleted.
7242 * The `unreachable_code` lint [warns when a function call's argument
7244 * The parser indicates [failures that may be caused by
7245 confusingly-similar Unicode characters][1.6uc]
7246 * Certain macro errors [are reported at definition time][1.6m], not
7252 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7253 environment variable when locating crates. This was a pre-cargo
7254 feature for integrating with the package manager that was
7255 accidentally never removed.
7256 * [A number of bugs were fixed in the privacy checker][1.6p] that
7257 could cause previously-accepted code to break.
7258 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7259 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7260 struct pattern syntax (`Foo(..)`) can no longer be used to match
7261 unit structs. This is a warning now, but will become an error in
7262 future releases. Patterns that share the same name as a const are
7264 * A bug was fixed that causes [rustc not to apply default type
7265 parameters][1.6xc] when resolving certain method implementations of
7266 traits defined in other crates.
7268 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7269 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7270 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7271 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7272 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7273 [1.6co]: http://doc.rust-lang.org/core/index.html
7274 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7275 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7276 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7277 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7278 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7279 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7280 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7281 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7282 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7283 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7284 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7285 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7286 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7287 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7288 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7289 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7290 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7291 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7292 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7293 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7294 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7295 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7296 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7297 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7298 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7299 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7300 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7301 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7302 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7303 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7304 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7305 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7306 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7307 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7308 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7309 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7310 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7311 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7312 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7313 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7314 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7317 Version 1.5.0 (2015-12-10)
7318 ==========================
7320 * ~700 changes, numerous bugfixes
7326 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7327 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7328 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7329 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7330 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7331 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7332 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7333 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7334 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7335 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7336 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7337 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7338 [`Path::read_link`], [`Path::symlink_metadata`],
7339 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7340 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7341 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7342 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7343 [`slice::split_first_mut`], [`slice::split_first`],
7344 [`slice::split_last_mut`], [`slice::split_last`],
7345 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7346 [`str::MatchIndices`], [`str::RMatchIndices`],
7347 [`str::match_indices`], [`str::rmatch_indices`],
7348 [`str::slice_mut_unchecked`], [`string::ParseError`].
7349 * Rust applications hosted on crates.io can be installed locally to
7350 `~/.cargo/bin` with the [`cargo install`] command. Among other
7351 things this makes it easier to augment Cargo with new subcommands:
7352 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7353 invoked as `cargo foo`.
7354 * Crates with wildcard (`*`) dependencies will [emit warnings when
7355 published][1.5w]. In 1.6 it will no longer be possible to publish
7356 crates with wildcard dependencies.
7361 * The rules determining when a particular lifetime must outlive
7362 a particular value (known as '[dropck]') have been [modified
7363 to not rely on parametricity][1.5p].
7364 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7365 and `Arc`][1.5a]. Because these smart pointer types implement
7366 `Deref`, this causes breakage in cases where the interior type
7367 contains methods of the same name.
7368 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7369 that they could drop their content. Soundness fix.
7370 * All method invocations are [properly checked][1.5wf1] for
7371 [well-formedness][1.5wf2]. Soundness fix.
7372 * Traits whose supertraits contain `Self` are [not object
7373 safe][1.5o]. Soundness fix.
7374 * Target specifications support a [`no_default_libraries`][1.5nd]
7375 setting that controls whether `-nodefaultlibs` is passed to the
7376 linker, and in turn the `is_like_windows` setting no longer affects
7377 the `-nodefaultlibs` flag.
7378 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7379 * The `#[inline]` and `#[repr]` attributes [can only appear
7380 in valid locations][1.5at].
7381 * Native libraries linked from the local crate are [passed to
7382 the linker before native libraries from upstream crates][1.5nl].
7383 * Two rarely-used attributes, `#[no_debug]` and
7384 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7385 * Negation of unsigned integers, which has been a warning for
7386 several releases, [is now behind a feature gate and will
7387 generate errors][1.5nu].
7388 * The parser accidentally accepted visibility modifiers on
7389 enum variants, a bug [which has been fixed][1.5ev].
7390 * [A bug was fixed that allowed `use` statements to import unstable
7396 * When evaluating expressions at compile-time that are not
7397 compile-time constants (const-evaluating expressions in non-const
7398 contexts), incorrect code such as overlong bitshifts and arithmetic
7399 overflow will [generate a warning instead of an error][1.5ce],
7400 delaying the error until runtime. This will allow the
7401 const-evaluator to be expanded in the future backwards-compatibly.
7402 * The `improper_ctypes` lint [no longer warns about using `isize` and
7403 `usize` in FFI][1.5ict].
7408 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7410 * `Default` is [implemented for mutable slices][1.5d].
7411 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7412 * There are now `From` conversions [between floating point
7413 types][1.5f] where the conversions are lossless.
7414 * There are now `From` conversions [between integer types][1.5i] where
7415 the conversions are lossless.
7416 * [`fs::Metadata` implements `Clone`][1.5fs].
7417 * The `parse` method [accepts a leading "+" when parsing
7419 * [`AsMut` is implemented for `Vec`][1.5am].
7420 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7421 been optimized][1.5cf] and no longer rely on the default impl.
7422 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7423 `unsafe extern "C"` function types now [implement `Clone`,
7424 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7425 `fmt::Debug` for up to 12 arguments][1.5fp].
7426 * [Dropping `Vec`s is much faster in unoptimized builds when the
7427 element types don't implement `Drop`][1.5dv].
7428 * A bug that caused in incorrect behavior when [combining `VecDeque`
7429 with zero-sized types][1.5vdz] was resolved.
7430 * [`PartialOrd` for slices is faster][1.5po].
7435 * [Crate metadata size was reduced by 20%][1.5md].
7436 * [Improvements to code generation reduced the size of libcore by 3.3
7437 MB and rustc's memory usage by 18MB][1.5m].
7438 * [Improvements to deref translation increased performance in
7439 unoptimized builds][1.5dr].
7440 * Various errors in trait resolution [are deduplicated to only be
7441 reported once][1.5te].
7442 * Rust has preliminary [support for rumprun kernels][1.5rr].
7443 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7445 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7446 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7447 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7448 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7449 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7450 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7451 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7452 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7453 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7454 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7455 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7456 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7457 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7458 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7459 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7460 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7461 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7462 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7463 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7464 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7465 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7466 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7467 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7468 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7469 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7470 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7471 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7472 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7473 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7474 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7475 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7476 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7477 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7478 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7479 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7480 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7481 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7482 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7483 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7484 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7485 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7486 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7487 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7488 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7489 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7490 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7491 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7492 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7493 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7494 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7495 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7496 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7497 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7498 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7499 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7500 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7501 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7502 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7503 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7504 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7505 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7506 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7507 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7508 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7509 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7510 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7511 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7512 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7513 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7514 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7515 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7516 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7517 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7518 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7519 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7520 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7521 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7522 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7523 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7524 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7525 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7526 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7527 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7528 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7529 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7530 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7531 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7532 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7533 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7535 Version 1.4.0 (2015-10-29)
7536 ==========================
7538 * ~1200 changes, numerous bugfixes
7543 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7544 GNU) are now supported and recommended for use.
7549 * [Several changes have been made to fix type soundness and improve
7550 the behavior of associated types][sound]. See [RFC 1214]. Although
7551 we have mostly introduced these changes as warnings this release, to
7552 become errors next release, there are still some scenarios that will
7553 see immediate breakage.
7554 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7555 line breaks in addition to `\n`][crlf].
7556 * [Loans of `'static` lifetime extend to the end of a function][stat].
7557 * [`str::parse` no longer introduces avoidable rounding error when
7558 parsing floating point numbers. Together with earlier changes to
7559 float formatting/output, "round trips" like f.to_string().parse()
7560 now preserve the value of f exactly. Additionally, leading plus
7561 signs are now accepted][fp3].
7567 * `use` statements that import multiple items [can now rename
7568 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7569 * [Binops work correctly on fat pointers][binfat].
7570 * `pub extern crate`, which does not behave as expected, [issues a
7571 warning][pec] until a better solution is found.
7576 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7577 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7578 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7579 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7580 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7581 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7582 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7583 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7584 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7585 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7586 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7587 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7588 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7589 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7590 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7591 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7592 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7593 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7595 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7596 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7597 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7598 `f64::from_str_radix`.
7599 * [Reverse-searching strings is faster with the 'two-way'
7601 * [`std::io::copy` allows `?Sized` arguments][cc].
7602 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7603 [override `count`, `nth` and `last` with an O(1)
7604 implementation][it].
7605 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7606 * [`IntoRawFd` has been added to the Unix-specific prelude,
7607 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7609 * [`Extend<String>` and `FromIterator<String` are both implemented for
7611 * [`IntoIterator` is implemented for references to `Option` and
7613 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7614 Copy`][ext] as part of [RFC 839]. This will cause type inference
7615 breakage in rare situations.
7616 * [`BinaryHeap` implements `Debug`][bh2].
7617 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7619 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7620 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7621 * [String comparison is faster][faststr].
7622 * `&mut T` where `T: std::fmt::Write` [also implements
7623 `std::fmt::Write`][mutw].
7624 * [A stable regression in `VecDeque::push_back` and other
7625 capacity-altering methods that caused panics for zero-sized types
7627 * [Function pointers implement traits for up to 12 parameters][fp2].
7632 * The compiler [no longer uses the 'morestack' feature to prevent
7633 stack overflow][mm]. Instead it uses guard pages and stack
7634 probes (though stack probes are not yet implemented on any platform
7636 * [The compiler matches traits faster when projections are involved][p].
7637 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7639 * [Cargo now displays useful information about what its doing during
7640 `cargo update`][cu].
7642 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7643 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7644 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7645 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7646 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7647 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7648 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7649 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7650 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7651 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7652 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7653 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7654 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7655 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7656 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7657 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7658 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7659 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7660 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7661 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7662 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7663 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7664 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7665 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7666 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7667 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7668 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7669 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7670 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7671 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7672 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7673 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7674 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7675 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7676 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7677 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7678 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7679 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7680 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7681 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7682 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7683 [bh2]: https://github.com/rust-lang/rust/pull/28156
7684 [binfat]: https://github.com/rust-lang/rust/pull/28270
7685 [bm]: https://github.com/rust-lang/rust/pull/28197
7686 [cc]: https://github.com/rust-lang/rust/pull/27531
7687 [crlf]: https://github.com/rust-lang/rust/pull/28034
7688 [cu]: https://github.com/rust-lang/cargo/pull/1931
7689 [d]: https://github.com/rust-lang/rust/pull/27825
7690 [dep]: https://github.com/rust-lang/rust/pull/28339
7691 [es]: https://github.com/rust-lang/rust/pull/27956
7692 [ext]: https://github.com/rust-lang/rust/pull/28094
7693 [faststr]: https://github.com/rust-lang/rust/pull/28338
7694 [ffi]: https://github.com/rust-lang/rust/pull/28779
7695 [fp]: https://github.com/rust-lang/rust/pull/28268
7696 [fp2]: https://github.com/rust-lang/rust/pull/28560
7697 [fp3]: https://github.com/rust-lang/rust/pull/27307
7698 [i]: https://github.com/rust-lang/rust/pull/27451
7699 [into2]: https://github.com/rust-lang/rust/pull/28039
7700 [it]: https://github.com/rust-lang/rust/pull/27652
7701 [mm]: https://github.com/rust-lang/rust/pull/27338
7702 [mutw]: https://github.com/rust-lang/rust/pull/28368
7703 [sound]: https://github.com/rust-lang/rust/pull/27641
7704 [p]: https://github.com/rust-lang/rust/pull/27866
7705 [pec]: https://github.com/rust-lang/rust/pull/28486
7706 [pr]: https://github.com/rust-lang/rust/pull/27896
7707 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7708 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7709 [s]: https://github.com/rust-lang/rust/pull/27474
7710 [stab]: https://github.com/rust-lang/rust/pull/28339
7711 [stat]: https://github.com/rust-lang/rust/pull/28321
7712 [vd]: https://github.com/rust-lang/rust/pull/28494
7714 Version 1.3.0 (2015-09-17)
7715 ==============================
7717 * ~900 changes, numerous bugfixes
7722 * The [new object lifetime defaults][nold] have been [turned
7723 on][nold2] after a cycle of warnings about the change. Now types
7724 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7725 being interpreted as `&'a Box<Trait+'a>` to `&'a
7726 Box<Trait+'static>`.
7727 * [The Rustonomicon][nom] is a new book in the official documentation
7728 that dives into writing unsafe Rust.
7729 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7730 timekeeping is employed by other std APIs, as well as out-of-tree
7736 * The [new object lifetime defaults][nold] have been [turned
7737 on][nold2] after a cycle of warnings about the change.
7738 * There is a known [regression][lr] in how object lifetime elision is
7739 interpreted, the proper solution for which is undetermined.
7740 * The `#[prelude_import]` attribute, an internal implementation
7741 detail, was accidentally stabilized previously. [It has been put
7742 behind the `prelude_import` feature gate][pi]. This change is
7743 believed to break no existing code.
7744 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7745 [more sane for dynamically sized types][dst3]. Code that relied on
7746 the previous behavior is thought to be broken.
7747 * The `dropck` rules, which checks that destructors can't access
7748 destroyed values, [have been updated][dropck] to match the
7749 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7750 cause some previously-compiling code to no longer build.
7755 * The [new object lifetime defaults][nold] have been [turned
7756 on][nold2] after a cycle of warnings about the change.
7757 * Semicolons may [now follow types and paths in
7758 macros](https://github.com/rust-lang/rust/pull/27000).
7759 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7760 [more sane for dynamically sized types][dst3]. Code that relied on
7761 the previous behavior is not known to exist, and suspected to be
7763 * `'static` variables [may now be recursive][st].
7764 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7765 implementations correctly.
7766 * The `dropck` rules, which checks that destructors can't access
7767 destroyed values, [have been updated][dropck] to match the
7773 * The [`Duration`] API, [has been stabilized][ds], as well as the
7774 `std::time` module, which presently contains only `Duration`.
7775 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7776 * The owned C string, [`CString`], implements [`Borrow`] and the
7777 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7778 these allow C strings to be borrowed and cloned in generic code.
7779 * [`CStr`] implements [`Debug`].
7780 * [`AtomicPtr`] implements [`Debug`].
7781 * [`Error`] trait objects [can be downcast to their concrete types][e]
7782 in many common configurations, using the [`is`], [`downcast`],
7783 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7785 * Searching for substrings now [employs the two-way algorithm][search]
7786 instead of doing a naive search. This gives major speedups to a
7787 number of methods, including [`contains`][sc], [`find`][sf],
7788 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7789 [`ends_with`][sew] are also faster.
7790 * The performance of `PartialEq` for slices is [much faster][ps].
7791 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7792 is overridden and optimized by the implementations for scalars.
7793 * The [`Hasher`] trait now has a number of specialized `write_*`
7794 methods for primitive types, for efficiency.
7795 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7796 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7797 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7798 of [`std::error::Error::cause`][iec] also delegates to the inner
7800 * [`process::Child`][pc] gained the [`id`] method, which returns a
7801 `u32` representing the platform-specific process identifier.
7802 * The [`connect`] method on slices is deprecated, replaced by the new
7803 [`join`] method (note that both of these are on the *unstable*
7804 [`SliceConcatExt`] trait, but through the magic of the prelude are
7805 available to stable code anyway).
7806 * The [`Div`] operator is implemented for [`Wrapping`] types.
7807 * [`DerefMut` is implemented for `String`][dms].
7808 * Performance of SipHash (the default hasher for `HashMap`) is
7809 [better for long data][sh].
7810 * [`AtomicPtr`] implements [`Send`].
7811 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7812 are now [specialized to use uninitialized buffers for increased
7814 * Lifetime parameters of foreign functions [are now resolved
7820 * Rust can now, with some coercion, [produce programs that run on
7821 Windows XP][xp], though XP is not considered a supported platform.
7822 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7823 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7824 recommended for use in 1.3, though should be fully-functional
7825 in the [64-bit 1.4 beta][b14].
7826 * On Fedora-based systems installation will [properly configure the
7827 dynamic linker][fl].
7828 * The compiler gained many new extended error descriptions, which can
7829 be accessed with the `--explain` flag.
7830 * The `dropck` pass, which checks that destructors can't access
7831 destroyed values, [has been rewritten][dropck]. This fixes some
7832 soundness holes, and as such will cause some previously-compiling
7833 code to no longer build.
7834 * `rustc` now uses [LLVM to write archive files where possible][ar].
7835 Eventually this will eliminate the compiler's dependency on the ar
7837 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7838 supported FreeBSD on x86_64).
7839 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7840 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7842 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7843 will kill the process instead of leaking][nlp].
7845 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7846 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7847 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7848 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7849 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7850 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7851 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7852 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7853 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7854 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7855 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7856 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7857 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7858 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7859 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7860 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7861 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7862 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7863 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7864 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7865 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7866 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7867 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7868 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7869 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7870 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7871 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7872 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7873 [ar]: https://github.com/rust-lang/rust/pull/26926
7874 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7875 [dms]: https://github.com/rust-lang/rust/pull/26241
7876 [dropck]: https://github.com/rust-lang/rust/pull/27261
7877 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7878 [ds]: https://github.com/rust-lang/rust/pull/26818
7879 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7880 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7881 [dst3]: https://github.com/rust-lang/rust/pull/27351
7882 [e]: https://github.com/rust-lang/rust/pull/24793
7883 [f]: https://github.com/rust-lang/rust/pull/26588
7884 [fb]: https://github.com/rust-lang/rust/pull/26959
7885 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7886 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7887 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7888 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7889 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7890 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7891 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7892 [lic]: https://github.com/rust-lang/rust/pull/26583
7893 [lnu]: https://github.com/rust-lang/rust/pull/27026
7894 [lr]: https://github.com/rust-lang/rust/issues/27248
7895 [lum]: https://github.com/rust-lang/rust/pull/26378
7896 [lur]: https://github.com/rust-lang/rust/pull/26783
7897 [nlp]: https://github.com/rust-lang/rust/pull/27176
7898 [nold2]: https://github.com/rust-lang/rust/pull/27045
7899 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7900 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7901 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7902 [pi]: https://github.com/rust-lang/rust/pull/26699
7903 [ps]: https://github.com/rust-lang/rust/pull/26884
7904 [rte]: https://github.com/rust-lang/rust/pull/26950
7905 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7906 [search]: https://github.com/rust-lang/rust/pull/26327
7907 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7908 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7909 [sh]: https://github.com/rust-lang/rust/pull/27280
7910 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7911 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7912 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7913 [st]: https://github.com/rust-lang/rust/pull/26630
7914 [win1]: https://github.com/rust-lang/rust/pull/26569
7915 [win2]: https://github.com/rust-lang/rust/pull/26741
7916 [win3]: https://github.com/rust-lang/rust/pull/26741
7917 [win4]: https://github.com/rust-lang/rust/pull/27210
7918 [xp]: https://github.com/rust-lang/rust/pull/26569
7920 Version 1.2.0 (2015-08-07)
7921 ==========================
7923 * ~1200 changes, numerous bugfixes
7928 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7929 like `Rc` to contain types without a fixed size, arrays and trait
7930 objects, finally enabling use of `Rc<[T]>` and completing the
7931 implementation of DST.
7932 * [Parallel codegen][parcodegen] is now working again, which can
7933 substantially speed up large builds in debug mode; It also gets
7934 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7935 jobs). It's not enabled by default, but will be "in the near
7936 future". It can be activated with the `-C codegen-units=N` flag to
7938 * This is the first release with [experimental support for linking
7939 with the MSVC linker and lib C on Windows (instead of using the GNU
7940 variants via MinGW)][win]. It is yet recommended only for the most
7941 intrepid Rustaceans.
7942 * Benchmark compilations are showing a 30% improvement in
7943 bootstrapping over 1.1.
7948 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7949 unicode case mapping, which is a previously-planned change in
7950 behavior and considered a bugfix.
7951 * [`mem::align_of`] now specifies [the *minimum alignment* for
7952 T][align], which is usually the alignment programs are interested
7953 in, and the same value reported by clang's
7954 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7956 * [The `#[packed]` attribute is no longer silently accepted by the
7957 compiler][packed]. This attribute did nothing and code that
7958 mentioned it likely did not work as intended.
7959 * Associated type defaults are [now behind the
7960 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7961 defaults *did not work*, but could be mentioned syntactically. As
7962 such this breakage has minimal impact.
7967 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7968 matching against dereferenceable values.
7973 * The [`Extend`] trait, which grows a collection from an iterator, is
7974 implemented over iterators of references, for `String`, `Vec`,
7975 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7976 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7977 * The [`iter::once`] function returns an iterator that yields a single
7978 element, and [`iter::empty`] returns an iterator that yields no
7980 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7981 over substring matches.
7982 * [`Cell`] and [`RefCell`] both implement `Eq`.
7983 * A number of methods for wrapping arithmetic are added to the
7984 integral types, [`wrapping_div`], [`wrapping_rem`],
7985 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7986 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7987 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7988 type.. It is illegal for the default arithmetic operations in Rust
7989 to overflow; the desire to wrap must be explicit.
7990 * The `{:#?}` formatting specifier [displays the alternate,
7991 pretty-printed][debugfmt] form of the `Debug` formatter. This
7992 feature was actually introduced prior to 1.0 with little
7994 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7995 for writing data to formatted strings, similar to [`io::Write`].
7996 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7997 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7998 are used by code generators to emit implementations of [`Debug`].
7999 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8000 methods that convert case, following Unicode case mapping.
8001 * It is now easier to handle poisoned locks. The [`PoisonError`]
8002 type, returned by failing lock operations, exposes `into_inner`,
8003 `get_ref`, and `get_mut`, which all give access to the inner lock
8004 guard, and allow the poisoned lock to continue to operate. The
8005 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8006 poisoned lock without attempting to take the lock.
8007 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8008 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8009 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8010 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8012 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8018 * `rustc` employs smarter heuristics for guessing at [typos].
8019 * `rustc` emits more efficient code for [no-op conversions between
8020 unsafe pointers][nop].
8021 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8022 resulting in faster compile times and smaller code.
8024 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8025 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8026 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8027 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8028 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8029 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8030 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8031 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8032 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8033 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8034 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8035 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8036 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8037 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8038 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8039 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8040 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8041 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8042 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8043 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8044 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8045 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8046 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8047 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8048 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8049 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8050 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8051 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8052 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8053 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8054 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8055 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8056 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8057 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8058 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8059 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8060 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8061 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8062 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8063 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8064 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8065 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8066 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8067 [align]: https://github.com/rust-lang/rust/pull/25646
8068 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8069 [typos]: https://github.com/rust-lang/rust/pull/26087
8070 [nop]: https://github.com/rust-lang/rust/pull/26336
8071 [fat]: https://github.com/rust-lang/rust/pull/26411
8072 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8073 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8074 [packed]: https://github.com/rust-lang/rust/pull/25541
8075 [ad]: https://github.com/rust-lang/rust/pull/27382
8076 [win]: https://github.com/rust-lang/rust/pull/25350
8078 Version 1.1.0 (2015-06-25)
8079 =========================
8081 * ~850 changes, numerous bugfixes
8086 * The [`std::fs` module has been expanded][fs] to expand the set of
8087 functionality exposed:
8088 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8089 don't incur a syscall on some platforms.
8090 * A `symlink_metadata` function has been added.
8091 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8092 access to all underlying information.
8093 * The compiler now contains extended explanations of many errors. When an error
8094 with an explanation occurs the compiler suggests using the `--explain` flag
8095 to read the explanation. Error explanations are also [available online][err-index].
8096 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8097 well as other work, the time to bootstrap the compiler decreased by
8103 * The [`str::split_whitespace`] method splits a string on unicode
8104 whitespace boundaries.
8105 * On both Windows and Unix, new extension traits provide conversion of
8106 I/O types to and from the underlying system handles. On Unix, these
8107 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8108 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8109 `TcpListener`, and `UpdSocket`. Further implementations for
8110 `std::process` will be stabilized later.
8111 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8112 Windows, symlinks can be created with
8113 `std::os::windows::symlink_dir` and
8114 `std::os::windows::symlink_file`.
8115 * The `mpsc::Receiver` type can now be converted into an iterator with
8116 `into_iter` on the [`IntoIterator`] trait.
8117 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8118 implementation of the [`From`] trait.
8119 * The `Debug` implementation for `RangeFull` [creates output that is
8120 more consistent with other implementations][rf].
8121 * [`Debug` is implemented for `File`][file].
8122 * The `Default` implementation for `Arc` [no longer requires `Sync +
8124 * [The `Iterator` methods `count`, `nth`, and `last` have been
8125 overridden for slices to have O(1) performance instead of O(n)][si].
8126 * Incorrect handling of paths on Windows has been improved in both the
8127 compiler and the standard library.
8128 * [`AtomicPtr` gained a `Default` implementation][ap].
8129 * In accordance with Rust's policy on arithmetic overflow `abs` now
8130 [panics on overflow when debug assertions are enabled][abs].
8131 * The [`Cloned`] iterator, which was accidentally left unstable for
8132 1.0 [has been stabilized][c].
8133 * The [`Incoming`] iterator, which iterates over incoming TCP
8134 connections, and which was accidentally unnamable in 1.0, [is now
8135 properly exported][inc].
8136 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8137 `sift_up` or `sift_down` panic][bh].
8138 * The [`split_off`] method of `LinkedList` [no longer corrupts
8139 the list in certain scenarios][ll].
8144 * Type checking performance [has improved notably][sk] with
8145 [multiple improvements][pre].
8146 * The compiler [suggests code changes][ch] for more errors.
8147 * rustc and it's build system have experimental support for [building
8148 toolchains against MUSL][m] instead of glibc on Linux.
8149 * The compiler defines the `target_env` cfg value, which is used for
8150 distinguishing toolchains that are otherwise for the same
8151 platform. Presently this is set to `gnu` for common GNU Linux
8152 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8153 * The [`cargo rustc`][crc] command invokes a build with custom flags
8155 * [Android executables are always position independent][pie].
8156 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8159 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8160 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8161 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8162 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8163 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8164 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8165 [rf]: https://github.com/rust-lang/rust/pull/24491
8166 [err-index]: https://doc.rust-lang.org/error-index.html
8167 [sk]: https://github.com/rust-lang/rust/pull/24615
8168 [pre]: https://github.com/rust-lang/rust/pull/25323
8169 [file]: https://github.com/rust-lang/rust/pull/24598
8170 [ch]: https://github.com/rust-lang/rust/pull/24683
8171 [arc]: https://github.com/rust-lang/rust/pull/24695
8172 [si]: https://github.com/rust-lang/rust/pull/24701
8173 [ap]: https://github.com/rust-lang/rust/pull/24834
8174 [m]: https://github.com/rust-lang/rust/pull/24777
8175 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8176 [crc]: https://github.com/rust-lang/cargo/pull/1568
8177 [pie]: https://github.com/rust-lang/rust/pull/24953
8178 [abs]: https://github.com/rust-lang/rust/pull/25441
8179 [c]: https://github.com/rust-lang/rust/pull/25496
8180 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8181 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8182 [inc]: https://github.com/rust-lang/rust/pull/25522
8183 [bh]: https://github.com/rust-lang/rust/pull/25856
8184 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8185 [ll]: https://github.com/rust-lang/rust/pull/26022
8186 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8187 [drop]: https://github.com/rust-lang/rust/pull/24935
8189 Version 1.0.0 (2015-05-15)
8190 ========================
8192 * ~1500 changes, numerous bugfixes
8197 * The vast majority of the standard library is now `#[stable]`. It is
8198 no longer possible to use unstable features with a stable build of
8200 * Many popular crates on [crates.io] now work on the stable release
8202 * Arithmetic on basic integer types now [checks for overflow in debug
8208 * Several [restrictions have been added to trait coherence][coh] in
8209 order to make it easier for upstream authors to change traits
8210 without breaking downstream code.
8211 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8212 improve error messages and macro behavior. For example, `0b1234` is
8213 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8214 * Trait bounds [are always invariant][inv], eliminating the need for
8215 the `PhantomFn` and `MarkerTrait` lang items, which have been
8217 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8218 "foo" as bar` syntax has been replaced with `extern crate foo as
8219 bar`, and Cargo now automatically translates "-" in *package* names
8220 to underscore for the crate name.
8221 * [Lifetime shadowing is an error][lt].
8222 * [`Send` no longer implies `'static`][send-rfc].
8223 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8224 `MyType::default()`.
8225 * Primitive types [now have inherent methods][prim-inherent],
8226 obviating the need for extension traits like `SliceExt`.
8227 * Methods with `Self: Sized` in their `where` clause are [considered
8228 object-safe][self-sized], allowing many extension traits like
8229 `IteratorExt` to be merged into the traits they extended.
8230 * You can now [refer to associated types][assoc-where] whose
8231 corresponding trait bounds appear only in a `where` clause.
8232 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8233 like `Send` and `Sync` are now library-defined.
8234 * A [Reflect trait][reflect] was introduced, which means that
8235 downcasting via the `Any` trait is effectively limited to concrete
8236 types. This helps retain the potentially-important "parametricity"
8237 property: generic code cannot behave differently for different type
8238 arguments except in minor ways.
8239 * The `unsafe_destructor` feature is now deprecated in favor of the
8240 [new `dropck`][dropck]. This change is a major reduction in unsafe
8246 * The `thread_local` module [has been renamed to `std::thread`][th].
8247 * The methods of `IteratorExt` [have been moved to the `Iterator`
8249 * Several traits that implement Rust's conventions for type
8250 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8251 [centralized in the `std::convert` module][con].
8252 * The `FromError` trait [was removed in favor of `From`][fe].
8253 * The basic sleep function [has moved to
8254 `std::thread::sleep_ms`][slp].
8255 * The `splitn` function now takes an `n` parameter that represents the
8256 number of items yielded by the returned iterator [instead of the
8257 number of 'splits'][spl].
8258 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8259 * [Derived implementations of `PartialOrd` now order enums according
8260 to their explicitly-assigned discriminants][po].
8261 * [Methods for searching strings are generic over `Pattern`s][pat],
8262 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8264 * [In method resolution, object methods are resolved before inherent
8266 * [`String::from_str` has been deprecated in favor of the `From` impl,
8267 `String::from`][sf].
8268 * [`io::Error` implements `Sync`][ios].
8269 * [The `words` method on `&str` has been replaced with
8270 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8272 * The new path and IO modules are complete and `#[stable]`. This
8273 was the major library focus for this cycle.
8274 * The path API was [revised][path-normalize] to normalize `.`,
8275 adjusting the tradeoffs in favor of the most common usage.
8276 * A large number of remaining APIs in `std` were also stabilized
8277 during this cycle; about 75% of the non-deprecated API surface
8279 * The new [string pattern API][string-pattern] landed, which makes
8280 the string slice API much more internally consistent and flexible.
8281 * A new set of [generic conversion traits][conversion] replaced
8282 many existing ad hoc traits.
8283 * Generic numeric traits were [completely removed][num-traits]. This
8284 was made possible thanks to inherent methods for primitive types,
8285 and the removal gives maximal flexibility for designing a numeric
8286 hierarchy in the future.
8287 * The `Fn` traits are now related via [inheritance][fn-inherit]
8288 and provide ergonomic [blanket implementations][fn-blanket].
8289 * The `Index` and `IndexMut` traits were changed to
8290 [take the index by value][index-value], enabling code like
8291 `hash_map["string"]` to work.
8292 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8293 `Copy` data is known to be `Clone` as well.
8298 * Many errors now have extended explanations that can be accessed with
8299 the `--explain` flag to `rustc`.
8300 * Many new examples have been added to the standard library
8302 * rustdoc has received a number of improvements focused on completion
8304 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8305 * Much headway was made on ecosystem-wide CI, making it possible
8306 to [compare builds for breakage][ci-compare].
8309 [crates.io]: http://crates.io
8310 [clo]: https://github.com/rust-lang/rust/pull/24034
8311 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8312 [con]: https://github.com/rust-lang/rust/pull/23875
8313 [cr]: https://github.com/rust-lang/rust/pull/23419
8314 [fe]: https://github.com/rust-lang/rust/pull/23879
8315 [ie]: https://github.com/rust-lang/rust/pull/23300
8316 [inv]: https://github.com/rust-lang/rust/pull/23938
8317 [ios]: https://github.com/rust-lang/rust/pull/24133
8318 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8319 [lt]: https://github.com/rust-lang/rust/pull/24057
8320 [meth]: https://github.com/rust-lang/rust/pull/24056
8321 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8322 [po]: https://github.com/rust-lang/rust/pull/24270
8323 [sf]: https://github.com/rust-lang/rust/pull/24517
8324 [slp]: https://github.com/rust-lang/rust/pull/23949
8325 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8326 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8327 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8328 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8329 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8330 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8331 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8332 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8333 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8334 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8335 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8336 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8337 [reflect]: https://github.com/rust-lang/rust/pull/23712
8338 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8339 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8340 [index-value]: https://github.com/rust-lang/rust/pull/23601
8341 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8342 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8343 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8344 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8345 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8346 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8349 Version 1.0.0-alpha.2 (2015-02-20)
8350 =====================================
8352 * ~1300 changes, numerous bugfixes
8356 * The various I/O modules were [overhauled][io-rfc] to reduce
8357 unnecessary abstractions and provide better interoperation with
8358 the underlying platform. The old `io` module remains temporarily
8360 * The standard library now [participates in feature gating][feat],
8361 so use of unstable libraries now requires a `#![feature(...)]`
8362 attribute. The impact of this change is [described on the
8363 forum][feat-forum]. [RFC][feat-rfc].
8367 * `for` loops [now operate on the `IntoIterator` trait][into],
8368 which eliminates the need to call `.iter()`, etc. to iterate
8369 over collections. There are some new subtleties to remember
8370 though regarding what sort of iterators various types yield, in
8371 particular that `for foo in bar { }` yields values from a move
8372 iterator, destroying the original collection. [RFC][into-rfc].
8373 * Objects now have [default lifetime bounds][obj], so you don't
8374 have to write `Box<Trait+'static>` when you don't care about
8375 storing references. [RFC][obj-rfc].
8376 * In types that implement `Drop`, [lifetimes must outlive the
8377 value][drop]. This will soon make it possible to safely
8378 implement `Drop` for types where `#[unsafe_destructor]` is now
8379 required. Read the [gorgeous RFC][drop-rfc] for details.
8380 * The fully qualified <T as Trait>::X syntax lets you set the Self
8381 type for a trait method or associated type. [RFC][ufcs-rfc].
8382 * References to types that implement `Deref<U>` now [automatically
8383 coerce to references][deref] to the dereferenced type `U`,
8384 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8385 should eliminate many unsightly uses of `&*`, as when converting
8386 from references to vectors into references to
8387 slices. [RFC][deref-rfc].
8388 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8389 `|:|`) is obsolete and closure kind is inferred from context.
8390 * [`Self` is a keyword][Self].
8394 * The `Show` and `String` formatting traits [have been
8395 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8396 their related purposes. Automatically getting a string
8397 conversion to use with `format!("{:?}", something_to_debug)` is
8398 now written `#[derive(Debug)]`.
8399 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8400 OsStr}`, provide strings in platform-specific encodings for easier
8401 interop with system APIs. [RFC][osstr-rfc].
8402 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8403 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8404 creating raw pointers.
8408 * Certain long error messages of the form 'expected foo found bar'
8409 are now [split neatly across multiple
8410 lines][multiline]. Examples in the PR.
8411 * On Unix Rust can be [uninstalled][un] by running
8412 `/usr/local/lib/rustlib/uninstall.sh`.
8413 * The `#[rustc_on_unimplemented]` attribute, requiring the
8414 'on_unimplemented' feature, lets rustc [display custom error
8415 messages when a trait is expected to be implemented for a type
8420 * Rust is tested against a [LALR grammar][lalr], which parses
8421 almost all the Rust files that rustc does.
8423 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8424 [close]: https://github.com/rust-lang/rust/pull/21843
8425 [deref]: https://github.com/rust-lang/rust/pull/21351
8426 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8427 [drop]: https://github.com/rust-lang/rust/pull/21972
8428 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8429 [feat]: https://github.com/rust-lang/rust/pull/21248
8430 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8431 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8432 [fmt]: https://github.com/rust-lang/rust/pull/21457
8433 [into]: https://github.com/rust-lang/rust/pull/20790
8434 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8435 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8436 [lalr]: https://github.com/rust-lang/rust/pull/21452
8437 [multiline]: https://github.com/rust-lang/rust/pull/19870
8438 [obj]: https://github.com/rust-lang/rust/pull/22230
8439 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8440 [onun]: https://github.com/rust-lang/rust/pull/20889
8441 [osstr]: https://github.com/rust-lang/rust/pull/21488
8442 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8443 [Self]: https://github.com/rust-lang/rust/pull/22158
8444 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8445 [un]: https://github.com/rust-lang/rust/pull/22256
8448 Version 1.0.0-alpha (2015-01-09)
8449 ==================================
8451 * ~2400 changes, numerous bugfixes
8455 * The language itself is considered feature complete for 1.0,
8456 though there will be many usability improvements and bugfixes
8457 before the final release.
8458 * Nearly 50% of the public API surface of the standard library has
8459 been declared 'stable'. Those interfaces are unlikely to change
8461 * The long-running debate over integer types has been
8462 [settled][ints]: Rust will ship with types named `isize` and
8463 `usize`, rather than `int` and `uint`, for pointer-sized
8464 integers. Guidelines will be rolled out during the alpha cycle.
8465 * Most crates that are not `std` have been moved out of the Rust
8466 distribution into the Cargo ecosystem so they can evolve
8467 separately and don't need to be stabilized as quickly, including
8468 'time', 'getopts', 'num', 'regex', and 'term'.
8469 * Documentation continues to be expanded with more API coverage, more
8470 examples, and more in-depth explanations. The guides have been
8471 consolidated into [The Rust Programming Language][trpl].
8472 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8473 * All official Rust binary installers now come with [Cargo], the
8474 Rust package manager.
8478 * Closures have been [completely redesigned][unboxed] to be
8479 implemented in terms of traits, can now be used as generic type
8480 bounds and thus monomorphized and inlined, or via an opaque
8481 pointer (boxed) as in the old system. The new system is often
8482 referred to as 'unboxed' closures.
8483 * Traits now support [associated types][assoc], allowing families
8484 of related types to be defined together and used generically in
8486 * Enum variants are [namespaced by their type names][enum].
8487 * [`where` clauses][where] provide a more versatile and attractive
8488 syntax for specifying generic bounds, though the previous syntax
8490 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8492 * Rust [no longer has a runtime][rt] of any description, and only
8493 supports OS threads, not green threads.
8494 * At long last, Rust has been overhauled for 'dynamically-sized
8495 types' ([DST]), which integrates 'fat pointers' (object types,
8496 arrays, and `str`) more deeply into the type system, making it
8498 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8499 `..j` that produce range types and which, when combined with the
8500 `Index` operator and multidispatch, leads to a convenient slice
8502 * The new range syntax revealed an ambiguity in the fixed-length
8503 array syntax, so now fixed length arrays [are written `[T;
8505 * The `Copy` trait is no longer implemented automatically. Unsafe
8506 pointers no longer implement `Sync` and `Send` so types
8507 containing them don't automatically either. `Sync` and `Send`
8508 are now 'unsafe traits' so one can "forcibly" implement them via
8509 `unsafe impl` if a type confirms to the requirements for them
8510 even though the internals do not (e.g. structs containing unsafe
8511 pointers like `Arc`). These changes are intended to prevent some
8512 footguns and are collectively known as [opt-in built-in
8513 traits][oibit] (though `Sync` and `Send` will soon become pure
8514 library types unknown to the compiler).
8515 * Operator traits now take their operands [by value][ops], and
8516 comparison traits can use multidispatch to compare one type
8517 against multiple other types, allowing e.g. `String` to be
8518 compared with `&str`.
8519 * `if let` and `while let` are no longer feature-gated.
8520 * Rust has adopted a more [uniform syntax for escaping unicode
8521 characters][unicode].
8522 * `macro_rules!` [has been declared stable][mac]. Though it is a
8523 flawed system it is sufficiently popular that it must be usable
8524 for 1.0. Effort has gone into [future-proofing][mac-future] it
8525 in ways that will allow other macro systems to be developed in
8526 parallel, and won't otherwise impact the evolution of the
8528 * The prelude has been [pared back significantly][prelude] such
8529 that it is the minimum necessary to support the most pervasive
8530 code patterns, and through [generalized where clauses][where]
8531 many of the prelude extension traits have been consolidated.
8532 * Rust's rudimentary reflection [has been removed][refl], as it
8533 incurred too much code generation for little benefit.
8534 * [Struct variants][structvars] are no longer feature-gated.
8535 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8536 known as 'higher-ranked trait bounds', this crucially allows
8537 unboxed closures to work.
8538 * Macros invocations surrounded by parens or square brackets and
8539 not terminated by a semicolon are [parsed as
8540 expressions][macros], which makes expressions like `vec![1i32,
8541 2, 3].len()` work as expected.
8542 * Trait objects now implement their traits automatically, and
8543 traits that can be coerced to objects now must be [object
8545 * Automatically deriving traits is now done with `#[derive(...)]`
8546 not `#[deriving(...)]` for [consistency with other naming
8547 conventions][derive].
8548 * Importing the containing module or enum at the same time as
8549 items or variants they contain is [now done with `self` instead
8550 of `mod`][self], as in use `foo::{self, bar}`
8551 * Glob imports are no longer feature-gated.
8552 * The `box` operator and `box` patterns have been feature-gated
8553 pending a redesign. For now unique boxes should be allocated
8554 like other containers, with `Box::new`.
8558 * A [series][coll1] of [efforts][coll2] to establish
8559 [conventions][coll3] for collections types has resulted in API
8560 improvements throughout the standard library.
8561 * New [APIs for error handling][err] provide ergonomic interop
8562 between error types, and [new conventions][err-conv] describe
8563 more clearly the recommended error handling strategies in Rust.
8564 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8565 it is easier to discuss failure in the context of error handling
8566 without making clarifications as to whether you are referring to
8567 the 'fail' macro or failure more generally.
8568 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8569 syscall when available.
8570 * The 'serialize' crate has been renamed 'rustc-serialize' and
8571 moved out of the distribution to Cargo. Although it is widely
8572 used now, it is expected to be superseded in the near future.
8573 * The `Show` formatter, typically implemented with
8574 `#[derive(Show)]` is [now requested with the `{:?}`
8575 specifier][show] and is intended for use by all types, for uses
8576 such as `println!` debugging. The new `String` formatter must be
8577 implemented by hand, uses the `{}` specifier, and is intended
8578 for full-fidelity conversions of things that can logically be
8579 represented as strings.
8583 * [Flexible target specification][flex] allows rustc's code
8584 generation to be configured to support otherwise-unsupported
8586 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8587 respective debuggers with Rust-appropriate pretty-printing.
8588 * The Windows installation of Rust is distributed with the
8589 MinGW components currently required to link binaries on that
8594 * Nullable enum optimizations have been extended to more types so
8595 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8596 space than the inner types themselves.
8597 * Work has begun on supporting AArch64.
8599 [Cargo]: https://crates.io
8600 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8601 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8602 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8603 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8604 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8605 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8606 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8607 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8608 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8609 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8610 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8611 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8612 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8613 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8614 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8615 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8616 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8617 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8618 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8619 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8620 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8621 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8622 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8623 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8624 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8625 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8626 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8627 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8628 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8629 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8630 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8631 [trpl]: https://doc.rust-lang.org/book/index.html
8632 [rbe]: http://rustbyexample.com/
8635 Version 0.12.0 (2014-10-09)
8636 =============================
8638 * ~1900 changes, numerous bugfixes
8642 * The introductory documentation (now called The Rust Guide) has
8643 been completely rewritten, as have a number of supplementary
8645 * Rust's package manager, Cargo, continues to improve and is
8646 sometimes considered to be quite awesome.
8647 * Many API's in `std` have been reviewed and updated for
8648 consistency with the in-development Rust coding
8649 guidelines. The standard library documentation tracks
8650 stabilization progress.
8651 * Minor libraries have been moved out-of-tree to the rust-lang org
8652 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8653 be installed with Cargo.
8654 * Lifetime elision allows lifetime annotations to be left off of
8655 function declarations in many common scenarios.
8656 * Rust now works on 64-bit Windows.
8659 * Indexing can be overloaded with the `Index` and `IndexMut`
8661 * The `if let` construct takes a branch only if the `let` pattern
8662 matches, currently behind the 'if_let' feature gate.
8663 * 'where clauses', a more flexible syntax for specifying trait
8664 bounds that is more aesthetic, have been added for traits and
8665 free functions. Where clauses will in the future make it
8666 possible to constrain associated types, which would be
8667 impossible with the existing syntax.
8668 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8669 the 'slicing_syntax' feature gate, and can be overloaded with
8670 the `Slice` or `SliceMut` traits.
8671 * The syntax for matching of sub-slices has been changed to use a
8672 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8673 consistency with other uses of `..` and to future-proof
8674 potential additional uses of the syntax.
8675 * The syntax for matching inclusive ranges in patterns has changed
8676 from `0..3` to `0...4` to be consistent with the exclusive range
8678 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8679 c]`) has been put behind the 'advanced_slice_patterns' feature
8680 gate and may be removed in the future.
8681 * Components of tuples and tuple structs can be extracted using
8682 the `value.0` syntax, currently behind the `tuple_indexing`
8684 * The `#[crate_id]` attribute is no longer supported; versioning
8685 is handled by the package manager.
8686 * Renaming crate imports are now written `extern crate foo as bar`
8687 instead of `extern crate bar = foo`.
8688 * Renaming use statements are now written `use foo as bar` instead
8690 * `let` and `match` bindings and argument names in macros are now
8692 * The new, more efficient, closure types ('unboxed closures') have
8693 been added under a feature gate, 'unboxed_closures'. These will
8694 soon replace the existing closure types, once higher-ranked
8695 trait lifetimes are added to the language.
8696 * `move` has been added as a keyword, for indicating closures
8697 that capture by value.
8698 * Mutation and assignment is no longer allowed in pattern guards.
8699 * Generic structs and enums can now have trait bounds.
8700 * The `Share` trait is now called `Sync` to free up the term
8701 'shared' to refer to 'shared reference' (the default reference
8703 * Dynamically-sized types have been mostly implemented,
8704 unifying the behavior of fat-pointer types with the rest of the
8706 * As part of dynamically-sized types, the `Sized` trait has been
8707 introduced, which qualifying types implement by default, and
8708 which type parameters expect by default. To specify that a type
8709 parameter does not need to be sized, write `<Sized? T>`. Most
8710 types are `Sized`, notable exceptions being unsized arrays
8711 (`[T]`) and trait types.
8712 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8713 * Lifetime bounds can now be applied to type parameters and object
8715 * The old, reference counted GC type, `Gc<T>` which was once
8716 denoted by the `@` sigil, has finally been removed. GC will be
8717 revisited in the future.
8720 * Library documentation has been improved for a number of modules.
8721 * Bit-vectors, collections::bitv has been modernized.
8722 * The url crate is deprecated in favor of
8723 http://github.com/servo/rust-url, which can be installed with
8725 * Most I/O stream types can be cloned and subsequently closed from
8727 * A `std::time::Duration` type has been added for use in I/O
8728 methods that rely on timers, as well as in the 'time' crate's
8729 `Timespec` arithmetic.
8730 * The runtime I/O abstraction layer that enabled the green thread
8731 scheduler to do non-thread-blocking I/O has been removed, along
8732 with the libuv-based implementation employed by the green thread
8733 scheduler. This will greatly simplify the future I/O work.
8734 * `collections::btree` has been rewritten to have a more
8735 idiomatic and efficient design.
8738 * rustdoc output now indicates the stability levels of API's.
8739 * The `--crate-name` flag can specify the name of the crate
8740 being compiled, like `#[crate_name]`.
8741 * The `-C metadata` specifies additional metadata to hash into
8742 symbol names, and `-C extra-filename` specifies additional
8743 information to put into the output filename, for use by the
8744 package manager for versioning.
8745 * debug info generation has continued to improve and should be
8746 more reliable under both gdb and lldb.
8747 * rustc has experimental support for compiling in parallel
8748 using the `-C codegen-units` flag.
8749 * rustc no longer encodes rpath information into binaries by
8753 * Stack usage has been optimized with LLVM lifetime annotations.
8754 * Official Rust binaries on Linux are more compatible with older
8755 kernels and distributions, built on CentOS 5.10.
8758 Version 0.11.0 (2014-07-02)
8759 ==========================
8761 * ~1700 changes, numerous bugfixes
8764 * ~[T] has been removed from the language. This type is superseded by
8766 * ~str has been removed from the language. This type is superseded by
8768 * ~T has been removed from the language. This type is superseded by the
8770 * @T has been removed from the language. This type is superseded by the
8771 standard library's std::gc::Gc<T> type.
8772 * Struct fields are now all private by default.
8773 * Vector indices and shift amounts are both required to be a `uint`
8774 instead of any integral type.
8775 * Byte character, byte string, and raw byte string literals are now all
8776 supported by prefixing the normal literal with a `b`.
8777 * Multiple ABIs are no longer allowed in an ABI string
8778 * The syntax for lifetimes on closures/procedures has been tweaked
8779 slightly: `<'a>|A, B|: 'b + K -> T`
8780 * Floating point modulus has been removed from the language; however it
8781 is still provided by a library implementation.
8782 * Private enum variants are now disallowed.
8783 * The `priv` keyword has been removed from the language.
8784 * A closure can no longer be invoked through a &-pointer.
8785 * The `use foo, bar, baz;` syntax has been removed from the language.
8786 * The transmute intrinsic no longer works on type parameters.
8787 * Statics now allow blocks/items in their definition.
8788 * Trait bounds are separated from objects with + instead of : now.
8789 * Objects can no longer be read while they are mutably borrowed.
8790 * The address of a static is now marked as insignificant unless the
8791 #[inline(never)] attribute is placed it.
8792 * The #[unsafe_destructor] attribute is now behind a feature gate.
8793 * Struct literals are no longer allowed in ambiguous positions such as
8794 if, while, match, and for..in.
8795 * Declaration of lang items and intrinsics are now feature-gated by
8797 * Integral literals no longer default to `int`, and floating point
8798 literals no longer default to `f64`. Literals must be suffixed with an
8799 appropriate type if inference cannot determine the type of the
8801 * The Box<T> type is no longer implicitly borrowed to &mut T.
8802 * Procedures are now required to not capture borrowed references.
8805 * The standard library is now a "facade" over a number of underlying
8806 libraries. This means that development on the standard library should
8807 be speedier due to smaller crates, as well as a clearer line between
8809 * A new library, libcore, lives under the standard library's facade
8810 which is Rust's "0-assumption" library, suitable for embedded and
8811 kernel development for example.
8812 * A regex crate has been added to the standard distribution. This crate
8813 includes statically compiled regular expressions.
8814 * The unwrap/unwrap_err methods on Result require a Show bound for
8815 better error messages.
8816 * The return types of the std::comm primitives have been centralized
8817 around the Result type.
8818 * A number of I/O primitives have gained the ability to time out their
8820 * A number of I/O primitives have gained the ability to close their
8821 reading/writing halves to cancel pending operations.
8822 * Reverse iterator methods have been removed in favor of `rev()` on
8823 their forward-iteration counterparts.
8824 * A bitflags! macro has been added to enable easy interop with C and
8825 management of bit flags.
8826 * A debug_assert! macro is now provided which is disabled when
8827 `--cfg ndebug` is passed to the compiler.
8828 * A graphviz crate has been added for creating .dot files.
8829 * The std::cast module has been migrated into std::mem.
8830 * The std::local_data api has been migrated from freestanding functions
8831 to being based on methods.
8832 * The Pod trait has been renamed to Copy.
8833 * jemalloc has been added as the default allocator for types.
8834 * The API for allocating memory has been changed to use proper alignment
8835 and sized deallocation
8836 * Connecting a TcpStream or binding a TcpListener is now based on a
8837 string address and a u16 port. This allows connecting to a hostname as
8839 * The Reader trait now contains a core method, read_at_least(), which
8840 correctly handles many repeated 0-length reads.
8841 * The process-spawning API is now centered around a builder-style
8843 * The :? printing qualifier has been moved from the standard library to
8844 an external libdebug crate.
8845 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8846 have been renamed to Eq/Ord.
8847 * The select/plural methods have been removed from format!. The escapes
8848 for { and } have also changed from \{ and \} to {{ and }},
8850 * The TaskBuilder API has been re-worked to be a true builder, and
8851 extension traits for spawning native/green tasks have been added.
8854 * All breaking changes to the language or libraries now have their
8855 commit message annotated with `[breaking-change]` to allow for easy
8856 discovery of breaking changes.
8857 * The compiler will now try to suggest how to annotate lifetimes if a
8858 lifetime-related error occurs.
8859 * Debug info continues to be improved greatly with general bug fixes and
8860 better support for situations like link time optimization (LTO).
8861 * Usage of syntax extensions when cross-compiling has been fixed.
8862 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8863 -fdata-sections and --gc-sections has been enabled by default
8864 * The compiler is now stricter about where it will load module files
8865 from when a module is declared via `mod foo;`.
8866 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8867 Syntax extensions are now discovered via a "plugin registrar" type
8868 which will be extended in the future to other various plugins.
8869 * Lints have been restructured to allow for dynamically loadable lints.
8870 * A number of rustdoc improvements:
8871 * The HTML output has been visually redesigned.
8872 * Markdown is now powered by hoedown instead of sundown.
8873 * Searching heuristics have been greatly improved.
8874 * The search index has been reduced in size by a great amount.
8875 * Cross-crate documentation via `pub use` has been greatly improved.
8876 * Primitive types are now hyperlinked and documented.
8877 * Documentation has been moved from static.rust-lang.org/doc to
8879 * A new sandbox, play.rust-lang.org, is available for running and
8880 sharing rust code examples on-line.
8881 * Unused attributes are now more robustly warned about.
8882 * The dead_code lint now warns about unused struct fields.
8883 * Cross-compiling to iOS is now supported.
8884 * Cross-compiling to mipsel is now supported.
8885 * Stability attributes are now inherited by default and no longer apply
8886 to intra-crate usage, only inter-crate usage.
8887 * Error message related to non-exhaustive match expressions have been
8891 Version 0.10 (2014-04-03)
8892 =========================
8894 * ~1500 changes, numerous bugfixes
8897 * A new RFC process is now in place for modifying the language.
8898 * Patterns with `@`-pointers have been removed from the language.
8899 * Patterns with unique vectors (`~[T]`) have been removed from the
8901 * Patterns with unique strings (`~str`) have been removed from the
8903 * `@str` has been removed from the language.
8904 * `@[T]` has been removed from the language.
8905 * `@self` has been removed from the language.
8906 * `@Trait` has been removed from the language.
8907 * Headers on `~` allocations which contain `@` boxes inside the type for
8908 reference counting have been removed.
8909 * The semantics around the lifetimes of temporary expressions have changed,
8910 see #3511 and #11585 for more information.
8911 * Cross-crate syntax extensions are now possible, but feature gated. See
8912 #11151 for more information. This includes both `macro_rules!` macros as
8913 well as syntax extensions such as `format!`.
8914 * New lint modes have been added, and older ones have been turned on to be
8916 * Unnecessary parentheses
8919 * Uppercase variables
8920 * Publicly visible private types
8921 * `#[deriving]` with raw pointers
8922 * Unsafe functions can no longer be coerced to closures.
8923 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8924 * The `#[simd]` attribute is now behind a feature gate.
8925 * Visibility is no longer allowed on `extern crate` statements, and
8926 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8927 * Trailing commas are now allowed in argument lists and tuple patterns.
8928 * The `do` keyword has been removed, it is now a reserved keyword.
8929 * Default type parameters have been implemented, but are feature gated.
8930 * Borrowed variables through captures in closures are now considered soundly.
8931 * `extern mod` is now `extern crate`
8932 * The `Freeze` trait has been removed.
8933 * The `Share` trait has been added for types that can be shared among
8935 * Labels in macros are now hygienic.
8936 * Expression/statement macro invocations can be delimited with `{}` now.
8937 * Treatment of types allowed in `static mut` locations has been tweaked.
8938 * The `*` and `.` operators are now overloadable through the `Deref` and
8940 * `~Trait` and `proc` no longer have `Send` bounds by default.
8941 * Partial type hints are now supported with the `_` type marker.
8942 * An `Unsafe` type was introduced for interior mutability. It is now
8943 considered undefined to transmute from `&T` to `&mut T` without using the
8945 * The #[linkage] attribute was implemented for extern statics/functions.
8946 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8947 * `Pod` was renamed to `Copy`.
8950 * The `libextra` library has been removed. It has now been decomposed into
8951 component libraries with smaller and more focused nuggets of
8952 functionality. The full list of libraries can be found on the
8953 documentation index page.
8954 * std: `std::condition` has been removed. All I/O errors are now propagated
8955 through the `Result` type. In order to assist with error handling, a
8956 `try!` macro for unwrapping errors with an early return and a lint for
8957 unused results has been added. See #12039 for more information.
8958 * std: The `vec` module has been renamed to `slice`.
8959 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8960 This will become the only growable vector in the future.
8961 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8962 are now found at `std::io::BufferedReader` instead of
8963 `std::io::buffered::BufferedReader`.
8964 * std: `print` and `println` are no longer in the prelude, the `print!` and
8965 `println!` macros are intended to be used instead.
8966 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8967 attempts to statically prevent cycles.
8968 * std: The standard distribution is adopting the policy of pushing failure
8969 to the user rather than failing in libraries. Many functions (such as
8970 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8971 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8972 deriving mode: `#[deriving(Show)]`.
8973 * std: `ToStr` is now implemented for all types implementing `Show`.
8974 * std: The formatting trait methods now take `&self` instead of `&T`
8975 * std: The `invert()` method on iterators has been renamed to `rev()`
8976 * std: `std::num` has seen a reduction in the genericity of its traits,
8977 consolidating functionality into a few core traits.
8978 * std: Backtraces are now printed on task failure if the environment
8979 variable `RUST_BACKTRACE` is present.
8980 * std: Naming conventions for iterators have been standardized. More details
8981 can be found on the wiki's style guide.
8982 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8983 still implement the function.
8984 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8985 * std: `assert_approx_eq!` has been removed
8986 * std: The `e` and `E` formatting specifiers for floats have been added to
8987 print them in exponential notation.
8988 * std: The `Times` trait has been removed
8989 * std: Indications of variance and opting out of builtin bounds is done
8990 through marker types in `std::kinds::marker` now
8991 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8992 `#[deriving(Hash)]` is now possible.
8993 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8994 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8995 * std: `Chan::new` is now `channel()`.
8996 * std: A new synchronous channel type has been implemented.
8997 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8998 * std: `hashmap` and `trie` have been moved to `libcollections`
8999 * std: `run` has been rolled into `io::process`
9000 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9001 * std: The equality and comparison traits have seen some reorganization.
9002 * std: `rand` has moved to `librand`.
9003 * std: `to_{lower,upper}case` has been implemented for `char`.
9004 * std: Logging has been moved to `liblog`.
9005 * collections: `HashMap` has been rewritten for higher performance and less
9007 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9008 it can be booted manually. The runtime guide has more information and
9010 * native: All I/O functionality except signals has been implemented.
9011 * green: Task spawning with `libgreen` has been optimized with stack caching
9012 and various trimming of code.
9013 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9014 * sync: The `extra::sync` module has been updated to modern rust (and moved
9015 to the `sync` library), tweaking and improving various interfaces while
9016 dropping redundant functionality.
9017 * sync: A new `Barrier` type has been added to the `sync` library.
9018 * sync: An efficient mutex for native and green tasks has been implemented.
9019 * serialize: The `base64` module has seen some improvement. It treats
9020 newlines better, has non-string error values, and has seen general
9022 * fourcc: A `fourcc!` macro was introduced
9023 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9024 hexadecimal literal.
9027 * `rustpkg` has been deprecated and removed from the main repository. Its
9028 replacement, `cargo`, is under development.
9029 * Nightly builds of rust are now available
9030 * The memory usage of rustc has been improved many times throughout this
9032 * The build process supports disabling rpath support for the rustc binary
9034 * Code generation has improved in some cases, giving more information to the
9035 LLVM optimization passes to enable more extensive optimizations.
9036 * Debuginfo compatibility with lldb on OSX has been restored.
9037 * The master branch is now gated on an android bot, making building for
9038 android much more reliable.
9039 * Output flags have been centralized into one `--emit` flag.
9040 * Crate type flags have been centralized into one `--crate-type` flag.
9041 * Codegen flags have been consolidated behind a `-C` flag.
9042 * Linking against outdated crates now has improved error messages.
9043 * Error messages with lifetimes will often suggest how to annotate the
9044 function to fix the error.
9045 * Many more types are documented in the standard library, and new guides
9047 * Many `rustdoc` improvements:
9048 * code blocks are syntax highlighted.
9049 * render standalone markdown files.
9050 * the --test flag tests all code blocks by default.
9051 * exported macros are displayed.
9052 * re-exported types have their documentation inlined at the location of the
9054 * search works across crates that have been rendered to the same output
9058 Version 0.9 (2014-01-09)
9059 ==========================
9061 * ~1800 changes, numerous bugfixes
9064 * The `float` type has been removed. Use `f32` or `f64` instead.
9065 * A new facility for enabling experimental features (feature gating) has
9066 been added, using the crate-level `#[feature(foo)]` attribute.
9067 * Managed boxes (@) are now behind a feature gate
9068 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9069 standard library's `Gc` or `Rc` types instead.
9070 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9071 * Jumping back to the top of a loop is now done with `continue` instead of
9073 * Strings can no longer be mutated through index assignment.
9074 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9075 hash delimiters, as in `r###"foo"###`.
9076 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9078 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9079 * `@fn`s have been removed.
9080 * `do` only works with procs in order to make it obvious what the cost
9082 * Single-element tuple-like structs can no longer be dereferenced to
9083 obtain the inner value. A more comprehensive solution for overloading
9084 the dereference operator will be provided in the future.
9085 * The `#[link(...)]` attribute has been replaced with
9086 `#[crate_id = "name#vers"]`.
9087 * Empty `impl`s must be terminated with empty braces and may not be
9088 terminated with a semicolon.
9089 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9090 no longer has any special meaning.
9091 * The old `fmt!` string formatting macro has been removed.
9092 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9093 `print!` and `println!`.
9094 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9095 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9096 `extern mod foo = "bar"` instead.
9097 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9098 * Macros can have attributes.
9099 * Macros can expand to items with attributes.
9100 * Macros can expand to multiple items.
9101 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9102 * Comments may be nested.
9103 * Values automatically coerce to trait objects they implement, without
9105 * Enum discriminants are no longer an entire word but as small as needed to
9106 contain all the variants. The `repr` attribute can be used to override
9107 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9108 `#[repr(C)]` to match C enums.
9109 * Non-string literals are not allowed in attributes (they never worked).
9110 * The FFI now supports variadic functions.
9111 * Octal numeric literals, as in `0o7777`.
9112 * The `concat!` syntax extension performs compile-time string concatenation.
9113 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9114 removed as Rust no longer uses segmented stacks.
9115 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9116 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9117 not `*`; ignoring remaining fields of a struct is also done with `..`,
9118 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9119 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9120 * `rustc` supports the "system" calling convention, which defaults to the
9121 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9123 * The `type_overflow` lint (default: warn) checks literals for overflow.
9124 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9125 * The `attribute_usage` lint (default: warn) warns about unknown
9127 * The `unknown_features` lint (default: warn) warns about unknown
9129 * The `dead_code` lint (default: warn) checks for dead code.
9130 * Rust libraries can be linked statically to one another
9131 * `#[link_args]` is behind the `link_args` feature gate.
9132 * Native libraries are now linked with `#[link(name = "foo")]`
9133 * Native libraries can be statically linked to a rust crate
9134 (`#[link(name = "foo", kind = "static")]`).
9135 * Native OS X frameworks are now officially supported
9136 (`#[link(name = "foo", kind = "framework")]`).
9137 * The `#[thread_local]` attribute creates thread-local (not task-local)
9138 variables. Currently behind the `thread_local` feature gate.
9139 * The `return` keyword may be used in closures.
9140 * Types that can be copied via a memcpy implement the `Pod` kind.
9141 * The `cfg` attribute can now be used on struct fields and enum variants.
9144 * std: The `option` and `result` API's have been overhauled to make them
9145 simpler, more consistent, and more composable.
9146 * std: The entire `std::io` module has been replaced with one that is
9147 more comprehensive and that properly interfaces with the underlying
9148 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9150 * std: `io::util` contains a number of useful implementations of
9151 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9152 `ZeroReader`, `TeeReader`.
9153 * std: The reference counted pointer type `extra::rc` moved into std.
9154 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9155 just a wrapper around it).
9156 * std: The `Either` type has been removed.
9157 * std: `fmt::Default` can be implemented for any type to provide default
9158 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9159 * std: The `rand` API continues to be tweaked.
9160 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9161 on failure in gdb, is now named `rust_fail`.
9162 * std: The `each_key` and `each_value` methods on `HashMap` have been
9163 replaced by the `keys` and `values` iterators.
9164 * std: Functions dealing with type size and alignment have moved from the
9165 `sys` module to the `mem` module.
9166 * std: The `path` module was written and API changed.
9167 * std: `str::from_utf8` has been changed to cast instead of allocate.
9168 * std: `starts_with` and `ends_with` methods added to vectors via the
9169 `ImmutableEqVector` trait, which is in the prelude.
9170 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9171 if the index is out of bounds.
9172 * std: Task failure no longer propagates between tasks, as the model was
9173 complex, expensive, and incompatible with thread-based tasks.
9174 * std: The `Any` type can be used for dynamic typing.
9175 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9177 * std: Methods that produce iterators generally do not have an `_iter`
9179 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9180 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9181 * std: `util::ignore` renamed to `prelude::drop`.
9182 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9184 * std: `vec::raw` has seen a lot of cleanup and API changes.
9185 * std: The standard library no longer includes any C++ code, and very
9186 minimal C, eliminating the dependency on libstdc++.
9187 * std: Runtime scheduling and I/O functionality has been factored out into
9188 extensible interfaces and is now implemented by two different crates:
9189 libnative, for native threading and I/O; and libgreen, for green threading
9190 and I/O. This paves the way for using the standard library in more limited
9191 embedded environments.
9192 * std: The `comm` module has been rewritten to be much faster, have a
9193 simpler, more consistent API, and to work for both native and green
9195 * std: All libuv dependencies have been moved into the rustuv crate.
9196 * native: New implementations of runtime scheduling on top of OS threads.
9197 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9199 * green: The green thread scheduler and message passing types are almost
9201 * extra: The `flatpipes` module had bitrotted and was removed.
9202 * extra: All crypto functions have been removed and Rust now has a policy of
9203 not reimplementing crypto in the standard library. In the future crypto
9204 will be provided by external crates with bindings to established libraries.
9205 * extra: `c_vec` has been modernized.
9206 * extra: The `sort` module has been removed. Use the `sort` method on
9210 * The `rust` and `rusti` commands have been removed, due to lack of
9212 * `rustdoc` was completely rewritten.
9213 * `rustdoc` can test code examples in documentation.
9214 * `rustpkg` can test packages with the argument, 'test'.
9215 * `rustpkg` supports arbitrary dependencies, including C libraries.
9216 * `rustc`'s support for generating debug info is improved again.
9217 * `rustc` has better error reporting for unbalanced delimiters.
9218 * `rustc`'s JIT support was removed due to bitrot.
9219 * Executables and static libraries can be built with LTO (-Z lto)
9220 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9224 Version 0.8 (2013-09-26)
9225 ============================
9227 * ~2200 changes, numerous bugfixes
9230 * The `for` loop syntax has changed to work with the `Iterator` trait.
9231 * At long last, unwinding works on Windows.
9232 * Default methods are ready for use.
9233 * Many trait inheritance bugs fixed.
9234 * Owned and borrowed trait objects work more reliably.
9235 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9236 * rustc can omit emission of code for the `debug!` macro if it is passed
9238 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9239 for foo.rs, then foo/mod.rs, and will generate an error when both are
9241 * Strings no longer contain trailing nulls. The new `std::c_str` module
9242 provides new mechanisms for converting to C strings.
9243 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9244 * The FFI has been overhauled such that foreign functions are called directly,
9245 instead of through a stack-switching wrapper.
9246 * Calling a foreign function must be done through a Rust function with the
9247 `#[fixed_stack_segment]` attribute.
9248 * The `externfn!` macro can be used to declare both a foreign function and
9249 a `#[fixed_stack_segment]` wrapper at once.
9250 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9251 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9252 * `priv` is disallowed everywhere except for struct fields and enum variants.
9253 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9254 * `ref` bindings in irrefutable patterns work correctly now.
9255 * `char` is now prevented from containing invalid code points.
9256 * Casting to `bool` is no longer allowed.
9257 * `\0` is now accepted as an escape in chars and strings.
9258 * `yield` is a reserved keyword.
9259 * `typeof` is a reserved keyword.
9260 * Crates may be imported by URL with `extern mod foo = "url";`.
9261 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9262 * Static vectors can be initialized with repeating elements,
9263 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9264 * Static structs can be initialized with functional record update,
9265 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9266 * `cfg!` can be used to conditionally execute code based on the crate
9267 configuration, similarly to `#[cfg(...)]`.
9268 * The `unnecessary_qualification` lint detects unneeded module
9269 prefixes (default: allow).
9270 * Arithmetic operations have been implemented on the SIMD types in
9271 `std::unstable::simd`.
9272 * Exchange allocation headers were removed, reducing memory usage.
9273 * `format!` implements a completely new, extensible, and higher-performance
9274 string formatting system. It will replace `fmt!`.
9275 * `print!` and `println!` write formatted strings (using the `format!`
9276 extension) to stdout.
9277 * `write!` and `writeln!` write formatted strings (using the `format!`
9278 extension) to the new Writers in `std::rt::io`.
9279 * The library section in which a function or static is placed may
9280 be specified with `#[link_section = "..."]`.
9281 * The `proto!` syntax extension for defining bounded message protocols
9283 * `macro_rules!` is hygienic for `let` declarations.
9284 * The `#[export_name]` attribute specifies the name of a symbol.
9285 * `unreachable!` can be used to indicate unreachable code, and fails
9289 * std: Transitioned to the new runtime, written in Rust.
9290 * std: Added an experimental I/O library, `rt::io`, based on the new
9292 * std: A new generic `range` function was added to the prelude, replacing
9293 `uint::range` and friends.
9294 * std: `range_rev` no longer exists. Since range is an iterator it can be
9295 reversed with `range(lo, hi).invert()`.
9296 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9297 renamed to `unwrap_or`.
9298 * std: The `iterator` module was renamed to `iter`.
9299 * std: Integral types now support the `checked_add`, `checked_sub`, and
9300 `checked_mul` operations for detecting overflow.
9301 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9303 * std: Methods are standardizing on conventions for casting methods:
9304 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9306 * std: The `CString` type in `c_str` provides new ways to convert to and
9308 * std: `DoubleEndedIterator` can yield elements in two directions.
9309 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9311 * std: `str::from_bytes` renamed to `str::from_utf8`.
9312 * std: `pop_opt` and `shift_opt` methods added to vectors.
9313 * std: The task-local data interface no longer uses @, and keys are
9314 no longer function pointers.
9315 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9316 * std: Added `SharedPort` to `comm`.
9317 * std: `Eq` has a default method for `ne`; only `eq` is required
9319 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9320 is required in implementations.
9321 * std: `is_utf8` performance is improved, impacting many string functions.
9322 * std: `os::MemoryMap` provides cross-platform mmap.
9323 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9324 are not 'in-bounds' are considered undefined.
9325 * std: Many freestanding functions in `vec` removed in favor of methods.
9326 * std: Many freestanding functions on scalar types removed in favor of
9328 * std: Many options to task builders were removed since they don't make
9329 sense in the new scheduler design.
9330 * std: More containers implement `FromIterator` so can be created by the
9332 * std: More complete atomic types in `unstable::atomics`.
9333 * std: `comm::PortSet` removed.
9334 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9335 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9336 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9337 default implementations.
9338 * std: Various `from_str` functions were removed in favor of a generic
9339 `from_str` which is available in the prelude.
9340 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9341 * extra: `dlist`, the doubly-linked list was modernized.
9342 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9343 * extra: Added `glob` module, replacing `std::os::glob`.
9344 * extra: `rope` was removed.
9345 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9346 * extra: `net`, and `timer` were removed. The experimental replacements
9347 are `std::rt::io::net` and `std::rt::io::timer`.
9348 * extra: Iterators implemented for `SmallIntMap`.
9349 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9350 * extra: `SmallIntSet` removed. Use `BitvSet`.
9351 * extra: Performance of JSON parsing greatly improved.
9352 * extra: `semver` updated to SemVer 2.0.0.
9353 * extra: `term` handles more terminals correctly.
9354 * extra: `dbg` module removed.
9355 * extra: `par` module removed.
9356 * extra: `future` was cleaned up, with some method renames.
9357 * extra: Most free functions in `getopts` were converted to methods.
9360 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9361 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9362 similarly to gcc's `--march` flag.
9363 * rustc's performance compiling small crates is much better.
9364 * rustpkg has received many improvements.
9365 * rustpkg supports git tags as package IDs.
9366 * rustpkg builds into target-specific directories so it can be used for
9368 * The number of concurrent test tasks is controlled by the environment
9369 variable RUST_TEST_TASKS.
9370 * The test harness can now report metrics for benchmarks.
9371 * All tools have man pages.
9372 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9373 * The runtime uses jemalloc for allocations.
9374 * Segmented stacks are temporarily disabled as part of the transition to
9375 the new runtime. Stack overflows are possible!
9376 * A new documentation backend, rustdoc_ng, is available for use. It is
9377 still invoked through the normal `rustdoc` command.
9380 Version 0.7 (2013-07-03)
9381 =======================
9383 * ~2000 changes, numerous bugfixes
9386 * `impl`s no longer accept a visibility qualifier. Put them on methods
9388 * The borrow checker has been rewritten with flow-sensitivity, fixing
9389 many bugs and inconveniences.
9390 * The `self` parameter no longer implicitly means `&'self self`,
9391 and can be explicitly marked with a lifetime.
9392 * Overloadable compound operators (`+=`, etc.) have been temporarily
9393 removed due to bugs.
9394 * The `for` loop protocol now requires `for`-iterators to return `bool`
9395 so they compose better.
9396 * The `Durable` trait is replaced with the `'static` bounds.
9397 * Trait default methods work more often.
9398 * Structs with the `#[packed]` attribute have byte alignment and
9399 no padding between fields.
9400 * Type parameters bound by `Copy` must now be copied explicitly with
9402 * It is now illegal to move out of a dereferenced unsafe pointer.
9403 * `Option<~T>` is now represented as a nullable pointer.
9404 * `@mut` does dynamic borrow checks correctly.
9405 * The `main` function is only detected at the topmost level of the crate.
9406 The `#[main]` attribute is still valid anywhere.
9407 * Struct fields may no longer be mutable. Use inherited mutability.
9408 * The `#[no_send]` attribute makes a type that would otherwise be
9410 * The `#[no_freeze]` attribute makes a type that would otherwise be
9412 * Unbounded recursion will abort the process after reaching the limit
9413 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9414 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9415 are never implicitly copyable.
9416 * `#[static_assert]` makes compile-time assertions about static bools.
9417 * At long last, 'argument modes' no longer exist.
9418 * The rarely used `use mod` statement no longer exists.
9421 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9423 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9424 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9426 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9427 and unsuffixed integer literals.
9430 * The `core` crate was renamed to `std`.
9431 * The `std` crate was renamed to `extra`.
9432 * More and improved documentation.
9433 * std: `iterator` module for external iterator objects.
9434 * Many old-style (internal, higher-order function) iterators replaced by
9435 implementations of `Iterator`.
9436 * std: Many old internal vector and string iterators,
9437 incl. `any`, `all`. removed.
9438 * std: The `finalize` method of `Drop` renamed to `drop`.
9439 * std: The `drop` method now takes `&mut self` instead of `&self`.
9440 * std: The prelude no longer re-exports any modules, only types and traits.
9441 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9442 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9443 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9444 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9445 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9446 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9447 * std: Many types implement `Clone`.
9448 * std: `path` type renamed to `Path`.
9449 * std: `mut` module and `Mut` type removed.
9450 * std: Many standalone functions removed in favor of methods and iterators
9451 in `vec`, `str`. In the future methods will also work as functions.
9452 * std: `reinterpret_cast` removed. Use `transmute`.
9453 * std: ascii string handling in `std::ascii`.
9454 * std: `Rand` is implemented for ~/@.
9455 * std: `run` module for spawning processes overhauled.
9456 * std: Various atomic types added to `unstable::atomic`.
9457 * std: Various types implement `Zero`.
9458 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9459 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9460 * std: Added `os::mkdir_recursive`.
9461 * std: Added `os::glob` function performs filesystems globs.
9462 * std: `FuzzyEq` renamed to `ApproxEq`.
9463 * std: `Map` now defines `pop` and `swap` methods.
9464 * std: `Cell` constructors converted to static methods.
9465 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9466 * extra: `flate` module moved from `std` to `extra`.
9467 * extra: `fileinput` module for iterating over a series of files.
9468 * extra: `Complex` number type and `complex` module.
9469 * extra: `Rational` number type and `rational` module.
9470 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9471 * extra: `term` uses terminfo now, is more correct.
9472 * extra: `arc` functions converted to methods.
9473 * extra: Implementation of fixed output size variations of SHA-2.
9476 * `unused_variables` lint mode for unused variables (default: warn).
9477 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9479 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9481 * `dead_assignment` lint mode for unread variables (default: warn).
9482 * `unnecessary_allocation` lint mode detects some heap allocations that are
9483 immediately borrowed so could be written without allocating (default: warn).
9484 * `missing_doc` lint mode (default: allow).
9485 * `unreachable_code` lint mode (default: warn).
9486 * The `rusti` command has been rewritten and a number of bugs addressed.
9487 * rustc outputs in color on more terminals.
9488 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9489 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9490 * Compiling with `-g` will make the binary record information about
9491 dynamic borrowcheck failures for debugging.
9492 * rustdoc has a nicer stylesheet.
9493 * Various improvements to rustdoc.
9494 * Improvements to rustpkg (see the detailed release notes).
9497 Version 0.6 (2013-04-03)
9498 ========================
9500 * ~2100 changes, numerous bugfixes
9503 * The self type parameter in traits is now spelled `Self`
9504 * The `self` parameter in trait and impl methods must now be explicitly
9505 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9506 * Static methods no longer require the `static` keyword and instead
9507 are distinguished by the lack of a `self` parameter
9508 * Replaced the `Durable` trait with the `'static` lifetime
9509 * The old closure type syntax with the trailing sigil has been
9510 removed in favor of the more consistent leading sigil
9511 * `super` is a keyword, and may be prefixed to paths
9512 * Trait bounds are separated with `+` instead of whitespace
9513 * Traits are implemented with `impl Trait for Type`
9514 instead of `impl Type: Trait`
9515 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9516 * The `export` keyword has finally been removed
9517 * The `move` keyword has been removed (see "Semantic changes")
9518 * The interior mutability qualifier on vectors, `[mut T]`, has been
9519 removed. Use `&mut [T]`, etc.
9520 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9521 * `fail` is no longer a keyword. Use `fail!()`
9522 * `assert` is no longer a keyword. Use `assert!()`
9523 * `log` is no longer a keyword. use `debug!`, etc.
9524 * 1-tuples may be represented as `(T,)`
9525 * Struct fields may no longer be `mut`. Use inherited mutability,
9526 `@mut T`, `core::mut` or `core::cell`
9527 * `extern mod { ... }` is no longer valid syntax for foreign
9528 function modules. Use extern blocks: `extern { ... }`
9529 * Newtype enums removed. Use tuple-structs.
9530 * Trait implementations no longer support visibility modifiers
9531 * Pattern matching over vectors improved and expanded
9532 * `const` renamed to `static` to correspond to lifetime name,
9533 and make room for future `static mut` unsafe mutable globals.
9534 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9535 * `Clone` implementations can be automatically generated with
9536 `#[deriving(Clone)]`
9537 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9538 instead of `foo as Bar`.
9539 * Fixed length vector types are now written as `[int, .. 3]`
9540 instead of `[int * 3]`.
9541 * Fixed length vector types can express the length as a constant
9542 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9545 * Types with owned pointers or custom destructors move by default,
9546 eliminating the `move` keyword
9547 * All foreign functions are considered unsafe
9548 * &mut is now unaliasable
9549 * Writes to borrowed @mut pointers are prevented dynamically
9551 * The name of the main function can be customized using #[main]
9552 * The default type of an inferred closure is &fn instead of @fn
9553 * `use` statements may no longer be "chained" - they cannot import
9554 identifiers imported by previous `use` statements
9555 * `use` statements are crate relative, importing from the "top"
9556 of the crate by default. Paths may be prefixed with `super::`
9557 or `self::` to change the search behavior.
9558 * Method visibility is inherited from the implementation declaration
9559 * Structural records have been removed
9560 * Many more types can be used in static items, including enums
9561 'static-lifetime pointers and vectors
9562 * Pattern matching over vectors improved and expanded
9563 * Typechecking of closure types has been overhauled to
9564 improve inference and eliminate unsoundness
9565 * Macros leave scope at the end of modules, unless that module is
9566 tagged with #[macro_escape]
9569 * Added big integers to `std::bigint`
9570 * Removed `core::oldcomm` module
9571 * Added pipe-based `core::comm` module
9572 * Numeric traits have been reorganized under `core::num`
9573 * `vec::slice` finally returns a slice
9574 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9575 * Containers reorganized around traits in `core::container`
9576 * `core::dvec` removed, `~[T]` is a drop-in replacement
9577 * `core::send_map` renamed to `core::hashmap`
9578 * `std::map` removed; replaced with `core::hashmap`
9579 * `std::treemap` reimplemented as an owned balanced tree
9580 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9581 * `core::trie` added as a fast ordered map for integer keys
9582 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9583 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9584 overload the comparison operators, whereas `TotalOrd` is used
9585 by certain container types
9588 * Replaced the 'cargo' package manager with 'rustpkg'
9589 * Added all-purpose 'rust' tool
9590 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9591 * rustc now *attempts* to offer spelling suggestions
9592 * Improved support for ARM and Android
9593 * Preliminary MIPS backend
9594 * Improved foreign function ABI implementation for x86, x86_64
9595 * Various memory usage improvements
9596 * Rust code may be embedded in foreign code under limited circumstances
9597 * Inline assembler supported by new asm!() syntax extension.
9600 Version 0.5 (2012-12-21)
9601 ===========================
9603 * ~900 changes, numerous bugfixes
9606 * Removed `<-` move operator
9607 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9608 * Removed old fixed length vector syntax - `[T]/N`
9609 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9610 * Macros may now expand to items and statements
9611 * `a.b()` is always parsed as a method call, never as a field projection
9612 * `Eq` and `IterBytes` implementations can be automatically generated
9613 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9614 * Removed the special crate language for `.rc` files
9615 * Function arguments may consist of any irrefutable pattern
9618 * `&` and `~` pointers may point to objects
9619 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9620 * Enum variants may be structs
9621 * Destructors can be added to all nominal types with the Drop trait
9622 * Structs and nullary enum variants may be constants
9623 * Values that cannot be implicitly copied are now automatically moved
9624 without writing `move` explicitly
9625 * `&T` may now be coerced to `*T`
9626 * Coercions happen in `let` statements as well as function calls
9627 * `use` statements now take crate-relative paths
9628 * The module and type namespaces have been merged so that static
9629 method names can be resolved under the trait in which they are
9632 * Improved support for language features
9633 * Trait inheritance works in many scenarios
9634 * More support for explicit self arguments in methods - `self`, `&self`
9635 `@self`, and `~self` all generally work as expected
9636 * Static methods work in more situations
9637 * Experimental: Traits may declare default methods for the implementations
9641 * New condition handling system in `core::condition`
9642 * Timsort added to `std::sort`
9643 * New priority queue, `std::priority_queue`
9644 * Pipes for serializable types, `std::flatpipes'
9645 * Serialization overhauled to be trait-based
9646 * Expanded `getopts` definitions
9647 * Moved futures to `std`
9648 * More functions are pure now
9649 * `core::comm` renamed to `oldcomm`. Still deprecated
9650 * `rustdoc` and `cargo` are libraries now
9653 * Added a preliminary REPL, `rusti`
9654 * License changed from MIT to dual MIT/APL2
9657 Version 0.4 (2012-10-15)
9658 ==========================
9660 * ~2000 changes, numerous bugfixes
9663 * All keywords are now strict and may not be used as identifiers anywhere
9664 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9665 'of', 'with', 'to', 'class'.
9666 * Classes are replaced with simpler structs
9667 * Explicit method self types
9668 * `ret` became `return` and `alt` became `match`
9669 * `import` is now `use`; `use is now `extern mod`
9670 * `extern mod { ... }` is now `extern { ... }`
9671 * `use mod` is the recommended way to import modules
9672 * `pub` and `priv` replace deprecated export lists
9673 * The syntax of `match` pattern arms now uses fat arrow (=>)
9674 * `main` no longer accepts an args vector; use `os::args` instead
9677 * Trait implementations are now coherent, ala Haskell typeclasses
9678 * Trait methods may be static
9679 * Argument modes are deprecated
9680 * Borrowed pointers are much more mature and recommended for use
9681 * Strings and vectors in the static region are stored in constant memory
9682 * Typestate was removed
9683 * Resolution rewritten to be more reliable
9684 * Support for 'dual-mode' data structures (freezing and thawing)
9687 * Most binary operators can now be overloaded via the traits in
9689 * `std::net::url` for representing URLs
9690 * Sendable hash maps in `core::send_map`
9691 * `core::task' gained a (currently unsafe) task-local storage API
9694 * An efficient new intertask communication primitive called the pipe,
9695 along with a number of higher-level channel types, in `core::pipes`
9696 * `std::arc`, an atomically reference counted, immutable, shared memory
9698 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9699 * Futures are now based on pipes and sendable
9700 * More robust linked task failure
9701 * Improved task builder API
9704 * Improved error reporting
9705 * Preliminary JIT support
9706 * Preliminary work on precise GC
9707 * Extensive architectural improvements to rustc
9708 * Begun a transition away from buggy C++-based reflection (shape) code to
9709 Rust-based (visitor) code
9710 * All hash functions and tables converted to secure, randomized SipHash
9713 Version 0.3 (2012-07-12)
9714 ========================
9716 * ~1900 changes, numerous bugfixes
9718 * New coding conveniences
9719 * Integer-literal suffix inference
9720 * Per-item control over warnings, errors
9721 * #[cfg(windows)] and #[cfg(unix)] attributes
9722 * Documentation comments
9723 * More compact closure syntax
9724 * 'do' expressions for treating higher-order functions as
9726 * *-patterns (wildcard extended to all constructor fields)
9729 * Name resolution pass and exhaustiveness checker rewritten
9730 * Region pointers and borrow checking supersede alias
9732 * Init-ness checking is now provided by a region-based liveness
9733 pass instead of the typestate pass; same for last-use analysis
9734 * Extensive work on region pointers
9736 * Experimental new language features
9737 * Slices and fixed-size, interior-allocated vectors
9738 * #!-comments for lang versioning, shell execution
9739 * Destructors and iface implementation for classes;
9740 type-parameterized classes and class methods
9741 * 'const' type kind for types that can be used to implement
9742 shared-memory concurrency patterns
9746 * Removal of various obsolete features
9747 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9748 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9750 * Constructs: do-while loops ('do' repurposed), fn binding,
9751 resources (replaced by destructors)
9753 * Compiler reorganization
9754 * Syntax-layer of compiler split into separate crate
9755 * Clang (from LLVM project) integrated into build
9756 * Typechecker split into sub-modules
9759 * New time functions
9760 * Extension methods for many built-in types
9761 * Arc: atomic-refcount read-only / exclusive-use shared cells
9762 * Par: parallel map and search routines
9763 * Extensive work on libuv interface
9764 * Much vector code moved to libraries
9765 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9766 #include, #include_str, #include_bin
9769 * Cargo automatically resolves dependencies
9772 Version 0.2 (2012-03-29)
9773 =========================
9775 * >1500 changes, numerous bugfixes
9777 * New docs and doc tooling
9779 * New port: FreeBSD x86_64
9781 * Compilation model enhancements
9782 * Generics now specialized, multiply instantiated
9783 * Functions now inlined across separate crates
9785 * Scheduling, stack and threading fixes
9786 * Noticeably improved message-passing performance
9787 * Explicit schedulers
9791 * Experimental new language features
9792 * Operator overloading
9796 * Various language extensions
9797 * C-callback function types: 'crust fn ...'
9798 * Infinite-loop construct: 'loop { ... }'
9799 * Shorten 'mutable' to 'mut'
9800 * Required mutable-local qualifier: 'let mut ...'
9801 * Basic glob-exporting: 'export foo::*;'
9802 * Alt now exhaustive, 'alt check' for runtime-checked
9803 * Block-function form of 'for' loop, with 'break' and 'ret'.
9806 * AST quasi-quote syntax extension
9807 * Revived libuv interface
9808 * New modules: core::{future, iter}, std::arena
9809 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9810 * Extensive cleanup, regularization in libstd, libcore
9813 Version 0.1 (2012-01-20)
9814 ===============================
9816 * Most language features work, including:
9817 * Unique pointers, unique closures, move semantics
9818 * Interface-constrained generics
9819 * Static interface dispatch
9821 * Multithread task scheduling
9822 * Typestate predicates
9823 * Failure unwinding, destructors
9824 * Pattern matching and destructuring assignment
9825 * Lightweight block-lambda syntax
9826 * Preliminary macro-by-example
9828 * Compiler works with the following configurations:
9829 * Linux: x86 and x86_64 hosts and targets
9830 * macOS: x86 and x86_64 hosts and targets
9831 * Windows: x86 hosts and targets
9833 * Cross compilation / multi-target configuration supported.
9835 * Preliminary API-documentation and package-management tools included.
9839 * Documentation is incomplete.
9841 * Performance is below intended target.
9843 * Standard library APIs are subject to extensive change, reorganization.
9845 * Language-level versioning is not yet operational - future code will