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 and lifetimes.][79135] Also known as "const generics"
8 E.g. you can now write the following. Note: Only values of primitive integers,
9 `bool`, or `char` types are currently permitted.
11 struct GenericArray<T, const LENGTH: usize> {
15 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
16 const fn last(&self) -> Option<&T> {
20 Some(&self.inner[LENGTH - 1])
30 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
31 This option controls whether debug information is split across multiple files
32 or packed into a single file. **Note** This option is unstable on other platforms.
33 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
34 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
35 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
36 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
38 \* Refer to Rust's [platform support page][platform-support-doc] for more
39 information on Rust's tiered platform support.
44 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
45 - [`str` now implements `AsMut<str>`.][80279]
46 - [`u64` and `u128` now implement `From<char>`.][79502]
47 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
48 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
49 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
50 - [`io::Empty` now implements `io::Seek`.][78044]
51 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
52 `T: ?Sized` types.][80764]
57 - [`Arc::decrement_strong_count`]
58 - [`Arc::increment_strong_count`]
59 - [`Once::call_once_force`]
60 - [`Peekable::next_if_eq`]
61 - [`Peekable::next_if`]
62 - [`Seek::stream_position`]
64 - [`panic::panic_any`]
66 - [`ptr::addr_of_mut!`]
67 - [`slice::fill_with`]
68 - [`slice::split_inclusive_mut`]
69 - [`slice::split_inclusive`]
70 - [`slice::strip_prefix`]
71 - [`slice::strip_suffix`]
72 - [`str::split_inclusive`]
78 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
79 codegen option.][cargo/9112]
80 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
81 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
82 to avoid unifying features of dependencies where that unification could be unwanted.
83 Such as using the same dependency with a `std` feature in a build scripts and
84 proc-macros, while using the `no-std` feature in the final binary. See the
85 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
90 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
91 - [You can now provide a `--default-theme` flag which sets the default theme to use for
92 documentation.][79642]
94 Various improvements to intra-doc links:
96 - [You can link to non-path primitives such as `slice`.][80181]
97 - [You can link to associated items.][74489]
98 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
102 - [You can now pass `--include-ignored` to tests (e.g. with
103 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
108 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
109 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
111 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
112 for the distributed artifacts.][81521]
113 - `armv5te-unknown-linux-gnueabi`
114 - `sparc64-unknown-linux-gnu`
115 - `thumbv7neon-unknown-linux-gnueabihf`
116 - `armv7-unknown-linux-gnueabi`
117 - `x86_64-unknown-linux-gnux32`
122 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
124 [79135]: https://github.com/rust-lang/rust/pull/79135
125 [74489]: https://github.com/rust-lang/rust/pull/74489
126 [76934]: https://github.com/rust-lang/rust/pull/76934
127 [79570]: https://github.com/rust-lang/rust/pull/79570
128 [80181]: https://github.com/rust-lang/rust/pull/80181
129 [79642]: https://github.com/rust-lang/rust/pull/79642
130 [80945]: https://github.com/rust-lang/rust/pull/80945
131 [80279]: https://github.com/rust-lang/rust/pull/80279
132 [80053]: https://github.com/rust-lang/rust/pull/80053
133 [79502]: https://github.com/rust-lang/rust/pull/79502
134 [75180]: https://github.com/rust-lang/rust/pull/75180
135 [79135]: https://github.com/rust-lang/rust/pull/79135
136 [81521]: https://github.com/rust-lang/rust/pull/81521
137 [80968]: https://github.com/rust-lang/rust/pull/80968
138 [80959]: https://github.com/rust-lang/rust/pull/80959
139 [80718]: https://github.com/rust-lang/rust/pull/80718
140 [80653]: https://github.com/rust-lang/rust/pull/80653
141 [80579]: https://github.com/rust-lang/rust/pull/80579
142 [79998]: https://github.com/rust-lang/rust/pull/79998
143 [78044]: https://github.com/rust-lang/rust/pull/78044
144 [81455]: https://github.com/rust-lang/rust/pull/81455
145 [80764]: https://github.com/rust-lang/rust/pull/80764
146 [80749]: https://github.com/rust-lang/rust/pull/80749
147 [80662]: https://github.com/rust-lang/rust/pull/80662
148 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
149 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
150 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
151 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
152 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
153 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
154 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
155 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
156 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
157 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
158 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
159 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
160 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
161 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
162 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
163 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
164 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
165 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
166 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
167 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
168 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
170 Version 1.50.0 (2021-02-11)
171 ============================
174 -----------------------
175 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
176 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
177 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
180 -----------------------
181 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
182 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
183 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
184 - [Dropped support for all cloudabi targets.][78439]
186 \* Refer to Rust's [platform support page][platform-support-doc] for more
187 information on Rust's tiered platform support.
190 -----------------------
192 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
193 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
194 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
195 This value cannot be a valid file descriptor, and now means `Option<File>` takes
196 up the same amount of space as `File`.
202 - [`btree_map::Entry::or_insert_with_key`]
205 - [`hash_map::Entry::or_insert_with_key`]
209 - [`UnsafeCell::get_mut`]
211 The following previously stable methods are now `const`.
213 - [`IpAddr::is_ipv4`]
214 - [`IpAddr::is_ipv6`]
215 - [`IpAddr::is_unspecified`]
216 - [`IpAddr::is_loopback`]
217 - [`IpAddr::is_multicast`]
218 - [`Ipv4Addr::octets`]
219 - [`Ipv4Addr::is_loopback`]
220 - [`Ipv4Addr::is_private`]
221 - [`Ipv4Addr::is_link_local`]
222 - [`Ipv4Addr::is_multicast`]
223 - [`Ipv4Addr::is_broadcast`]
224 - [`Ipv4Addr::is_documentation`]
225 - [`Ipv4Addr::to_ipv6_compatible`]
226 - [`Ipv4Addr::to_ipv6_mapped`]
227 - [`Ipv6Addr::segments`]
228 - [`Ipv6Addr::is_unspecified`]
229 - [`Ipv6Addr::is_loopback`]
230 - [`Ipv6Addr::is_multicast`]
231 - [`Ipv6Addr::to_ipv4`]
234 - [`Layout::from_size_align`]
235 - `pow` for all integer types.
236 - `checked_pow` for all integer types.
237 - `saturating_pow` for all integer types.
238 - `wrapping_pow` for all integer types.
239 - `next_power_of_two` for all unsigned integer types.
240 - `checked_next_power_of_two` for all unsigned integer types.
243 -----------------------
245 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
246 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
247 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
248 contents of that directory for changes.][cargo/8973]
249 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
254 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
255 - [Running tests will now print the total time taken to execute.][75752]
260 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
261 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
262 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
263 unhygenic `macro_rules!` macros.][79472]
264 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
265 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
266 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
267 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
268 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
269 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
271 [74989]: https://github.com/rust-lang/rust/pull/74989
272 [79261]: https://github.com/rust-lang/rust/pull/79261
273 [79896]: https://github.com/rust-lang/rust/pull/79896
274 [79484]: https://github.com/rust-lang/rust/pull/79484
275 [79472]: https://github.com/rust-lang/rust/pull/79472
276 [79270]: https://github.com/rust-lang/rust/pull/79270
277 [79003]: https://github.com/rust-lang/rust/pull/79003
278 [78864]: https://github.com/rust-lang/rust/pull/78864
279 [78636]: https://github.com/rust-lang/rust/pull/78636
280 [78439]: https://github.com/rust-lang/rust/pull/78439
281 [78343]: https://github.com/rust-lang/rust/pull/78343
282 [78296]: https://github.com/rust-lang/rust/pull/78296
283 [78068]: https://github.com/rust-lang/rust/pull/78068
284 [75752]: https://github.com/rust-lang/rust/pull/75752
285 [74699]: https://github.com/rust-lang/rust/pull/74699
286 [78142]: https://github.com/rust-lang/rust/pull/78142
287 [77484]: https://github.com/rust-lang/rust/pull/77484
288 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
289 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
290 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
291 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
292 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
293 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
294 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
295 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
296 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
297 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
298 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
299 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
300 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
301 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
302 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
303 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
304 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
305 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
306 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
307 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
308 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
309 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
310 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
311 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
312 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
313 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
314 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
315 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
316 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
317 [`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
318 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
319 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
320 [`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
321 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
324 Version 1.49.0 (2020-12-31)
325 ============================
328 -----------------------
330 - [Unions can now implement `Drop`, and you can now have a field in a union
331 with `ManuallyDrop<T>`.][77547]
332 - [You can now cast uninhabited enums to integers.][76199]
333 - [You can now bind by reference and by move in patterns.][76119] This
334 allows you to selectively borrow individual components of a type. E.g.
342 let person = Person {
343 name: String::from("Alice"),
347 // `name` is moved out of person, but `age` is referenced.
348 let Person { name, ref age } = person;
349 println!("{} {}", name, age);
353 -----------------------
355 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
356 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
357 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
358 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
359 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
360 - [Output from threads spawned in tests is now captured.][78227]
361 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
363 \* Refer to Rust's [platform support page][platform-support-doc] for more
364 information on Rust's tiered platform support.
367 -----------------------
369 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
370 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
375 - [`slice::select_nth_unstable`]
376 - [`slice::select_nth_unstable_by`]
377 - [`slice::select_nth_unstable_by_key`]
379 The following previously stable methods are now `const`.
382 - [`Poll::is_pending`]
385 -----------------------
386 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
387 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
388 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
389 variable will be set if the crate being built is one the user selected to build, either
390 with `-p` or through defaults.
391 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
397 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
398 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
399 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
400 Previously such invalid or unused attributes could be ignored.
401 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
402 read [this post about the changes][rustdoc-ws-post] for more details.
403 - [Trait bounds are no longer inferred for associated types.][79904]
407 These changes provide no direct user facing benefits, but represent significant
408 improvements to the internals and overall performance of rustc and
411 - [rustc's internal crates are now compiled using the `initial-exec` Thread
412 Local Storage model.][78201]
413 - [Calculate visibilities once in resolve.][78077]
414 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
415 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
418 [75991]: https://github.com/rust-lang/rust/pull/75991
419 [78951]: https://github.com/rust-lang/rust/pull/78951
420 [78848]: https://github.com/rust-lang/rust/pull/78848
421 [78746]: https://github.com/rust-lang/rust/pull/78746
422 [78376]: https://github.com/rust-lang/rust/pull/78376
423 [78228]: https://github.com/rust-lang/rust/pull/78228
424 [78227]: https://github.com/rust-lang/rust/pull/78227
425 [78201]: https://github.com/rust-lang/rust/pull/78201
426 [78109]: https://github.com/rust-lang/rust/pull/78109
427 [78077]: https://github.com/rust-lang/rust/pull/78077
428 [77997]: https://github.com/rust-lang/rust/pull/77997
429 [77703]: https://github.com/rust-lang/rust/pull/77703
430 [77547]: https://github.com/rust-lang/rust/pull/77547
431 [77015]: https://github.com/rust-lang/rust/pull/77015
432 [76199]: https://github.com/rust-lang/rust/pull/76199
433 [76119]: https://github.com/rust-lang/rust/pull/76119
434 [75914]: https://github.com/rust-lang/rust/pull/75914
435 [79004]: https://github.com/rust-lang/rust/pull/79004
436 [78676]: https://github.com/rust-lang/rust/pull/78676
437 [79904]: https://github.com/rust-lang/rust/issues/79904
438 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
439 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
440 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
441 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
442 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
443 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
444 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
445 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
446 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
447 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
448 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
450 Version 1.48.0 (2020-11-19)
451 ==========================
456 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
457 is still rejected *semantically*, but can now be parsed by procedural macros.
461 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
462 `rustc` whether to link its own C runtime and libraries or to rely on a external
463 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
464 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
465 Note: If you're using cargo you must explicitly pass the `--target` flag.
466 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
468 \* Refer to Rust's [platform support page][platform-support-doc] for more
469 information on Rust's tiered platform support.
473 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
474 and `&Stderr`.][76275]
475 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
476 - [The `matches!` macro now supports having a trailing comma.][74880]
477 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
478 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
482 - [`slice::as_ptr_range`]
483 - [`slice::as_mut_ptr_range`]
484 - [`VecDeque::make_contiguous`]
485 - [`future::pending`]
488 The following previously stable methods are now `const fn`'s:
490 - [`Option::is_some`]
491 - [`Option::is_none`]
496 - [`Ordering::reverse`]
504 - [You can now link to items in `rustdoc` using the intra-doc link
505 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
506 a link to `std::future`'s documentation. See ["Linking to items by
507 name"][intradoc-links] for more information.
508 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
509 when searching through `rustdoc`'s UI.][75740]
513 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
514 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
515 promoted to `'static` lifetime any more inside `const fn`s.
516 - [Associated type bindings on trait objects are now verified to meet the bounds
517 declared on the trait when checking that they implement the trait.][27675]
518 - [When trait bounds on associated types or opaque types are ambiguous, the
519 compiler no longer makes an arbitrary choice on which bound to use.][54121]
520 - [Fixed recursive nonterminals not being expanded in macros during
521 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
522 correctly handling recursive nonterminal tokens.
523 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
524 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
525 in places where they have no effect.][73461]
526 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
527 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
528 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
529 disallow zero-initialization.][71274]
530 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
531 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
532 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
533 see the [`catch_unwind`] documentation for further information.
539 These changes provide no direct user facing benefits, but represent significant
540 improvements to the internals and overall performance of rustc and
543 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
544 You can continue building with `make` by setting `ninja=false` in
546 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
547 - [Made `ensure_sufficient_stack()` non-generic][76680]
549 [78143]: https://github.com/rust-lang/rust/issues/78143
550 [76680]: https://github.com/rust-lang/rust/pull/76680/
551 [76030]: https://github.com/rust-lang/rust/pull/76030/
552 [70212]: https://github.com/rust-lang/rust/pull/70212/
553 [27675]: https://github.com/rust-lang/rust/issues/27675/
554 [54121]: https://github.com/rust-lang/rust/issues/54121/
555 [71274]: https://github.com/rust-lang/rust/pull/71274/
556 [77386]: https://github.com/rust-lang/rust/pull/77386/
557 [77153]: https://github.com/rust-lang/rust/pull/77153/
558 [77055]: https://github.com/rust-lang/rust/pull/77055/
559 [76275]: https://github.com/rust-lang/rust/pull/76275/
560 [76310]: https://github.com/rust-lang/rust/pull/76310/
561 [76420]: https://github.com/rust-lang/rust/pull/76420/
562 [76158]: https://github.com/rust-lang/rust/pull/76158/
563 [75857]: https://github.com/rust-lang/rust/pull/75857/
564 [75585]: https://github.com/rust-lang/rust/pull/75585/
565 [75740]: https://github.com/rust-lang/rust/pull/75740/
566 [75502]: https://github.com/rust-lang/rust/pull/75502/
567 [74880]: https://github.com/rust-lang/rust/pull/74880/
568 [74922]: https://github.com/rust-lang/rust/pull/74922/
569 [74430]: https://github.com/rust-lang/rust/pull/74430/
570 [74194]: https://github.com/rust-lang/rust/pull/74194/
571 [73461]: https://github.com/rust-lang/rust/pull/73461/
572 [73166]: https://github.com/rust-lang/rust/pull/73166/
573 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
574 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
575 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
576 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
577 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
578 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
579 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
580 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
581 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
582 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
583 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
584 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
585 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
586 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
587 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
590 Version 1.47.0 (2020-10-08)
591 ==========================
595 - [Closures will now warn when not used.][74869]
599 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
600 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
602 - [Upgraded to LLVM 11.][73526]
603 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
604 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
605 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
607 \* Refer to Rust's [platform support page][platform-support-doc] for more
608 information on Rust's tiered platform support.
612 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
613 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
614 those of length less than 33.][74060]
615 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
616 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
617 `PartialEq`, and `PartialOrd`.][73583]
622 - [`Range::is_empty`]
623 - [`RangeInclusive::is_empty`]
624 - [`Result::as_deref`]
625 - [`Result::as_deref_mut`]
627 - [`pointer::offset_from`]
631 The following previously stable APIs have now been made const.
633 - [The `new` method for all `NonZero` integers.][73858]
634 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
635 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
636 methods for all integers.][73858]
637 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
638 signed integers.][73858]
639 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
640 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
641 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
642 `is_ascii_control` methods for `char` and `u8`.][73858]
646 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
647 You can override this by setting the following in your `Cargo.toml`.
649 [profile.release.build-override]
652 - [`cargo-help` will now display man pages for commands rather just the
653 `--help` text.][cargo/8456]
654 - [`cargo-metadata` now emits a `test` field indicating if a target has
655 tests enabled.][cargo/8478]
656 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
657 - [`cargo-publish` will now use an alternative registry by default if it's the
658 only registry specified in `package.publish`.][cargo/8571]
662 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
663 type based search.][75366]
664 - [Added the Ayu theme to rustdoc.][71237]
668 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
669 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
670 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
671 help to preserve more span information.][73084] These changes may cause
672 compiliation errors if your macro was unhygenic or didn't correctly handle
674 - [Moved support for the CloudABI target to tier 3.][75568]
675 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
676 - [Added the `rustc-docs` component.][75560] This allows you to install
677 and read the documentation for the compiler internal APIs. (Currently only
678 available for `x86_64-unknown-linux-gnu`.)
683 - [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.
685 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
686 [75048]: https://github.com/rust-lang/rust/pull/75048/
687 [74163]: https://github.com/rust-lang/rust/pull/74163/
688 [71237]: https://github.com/rust-lang/rust/pull/71237/
689 [74869]: https://github.com/rust-lang/rust/pull/74869/
690 [73858]: https://github.com/rust-lang/rust/pull/73858/
691 [75716]: https://github.com/rust-lang/rust/pull/75716/
692 [75908]: https://github.com/rust-lang/rust/pull/75908/
693 [75516]: https://github.com/rust-lang/rust/pull/75516/
694 [75560]: https://github.com/rust-lang/rust/pull/75560/
695 [75568]: https://github.com/rust-lang/rust/pull/75568/
696 [75366]: https://github.com/rust-lang/rust/pull/75366/
697 [75204]: https://github.com/rust-lang/rust/pull/75204/
698 [74650]: https://github.com/rust-lang/rust/pull/74650/
699 [74419]: https://github.com/rust-lang/rust/pull/74419/
700 [73964]: https://github.com/rust-lang/rust/pull/73964/
701 [74021]: https://github.com/rust-lang/rust/pull/74021/
702 [74060]: https://github.com/rust-lang/rust/pull/74060/
703 [73893]: https://github.com/rust-lang/rust/pull/73893/
704 [73526]: https://github.com/rust-lang/rust/pull/73526/
705 [73583]: https://github.com/rust-lang/rust/pull/73583/
706 [73084]: https://github.com/rust-lang/rust/pull/73084/
707 [73197]: https://github.com/rust-lang/rust/pull/73197/
708 [72488]: https://github.com/rust-lang/rust/pull/72488/
709 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
710 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
711 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
712 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
713 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
714 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
715 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
716 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
717 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
718 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
719 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
720 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
721 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
722 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
723 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
726 Version 1.46.0 (2020-08-27)
727 ==========================
731 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
732 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
733 const functions.][73862]
734 - [The `#[track_caller]` attribute can now be added to functions to use the
735 function's caller's location information for panic messages.][72445]
736 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
737 `x.0.0` over `(x.0).0`.
738 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
739 You currently can't use `mem::transmute` in constant functions.
743 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
744 - [Enabled static "Position Independent Executables" by default
745 for `x86_64-unknown-linux-musl`.][70740]
749 - [`mem::forget` is now a `const fn`.][73887]
750 - [`String` now implements `From<char>`.][73466]
751 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
752 integer types.][73032]
753 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
754 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
755 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
756 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
757 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
758 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
763 - [`vec::Drain::as_slice`]
767 Added a number of new environment variables that are now available when
768 compiling your crate.
770 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
771 the specific binary being compiled and the name of the crate.
772 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
773 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
777 - [The target configuration option `abi_blacklist` has been renamed
778 to `unsupported_abis`.][74150] The old name will still continue to work.
779 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
780 This was previously accepted but will become a hard error in a future release.
781 - [Rustc will fail to compile if you have a struct with
782 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
784 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
785 ensure that spans have the correct information, and may cause breakage if you
786 were relying on receiving spans with dummy information.
787 - [The InnoSetup installer for Windows is no longer available.][72569] This was
788 a legacy installer that was replaced by a MSI installer a few years ago but
789 was still being built.
790 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
791 - [Rustc will no longer accept overlapping trait implementations that only
792 differ in how the lifetime was bound.][72493]
793 - [Rustc now correctly relates the lifetime of an existential associated
794 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
795 you to pass a shorter lifetime than expected.
796 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
797 The library will need to be installed for `rustc` to work, even though we
798 expect it to be already available on most systems.
799 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
801 - [Pretty printing of some tokens in procedural macros changed.][75453] The
802 exact output returned by rustc's pretty printing is an unstable
803 implementation detail: we recommend any macro relying on it to switch to a
804 more robust parsing system.
806 [75453]: https://github.com/rust-lang/rust/issues/75453/
807 [74820]: https://github.com/rust-lang/rust/issues/74820/
808 [74420]: https://github.com/rust-lang/rust/issues/74420/
809 [74109]: https://github.com/rust-lang/rust/pull/74109/
810 [74150]: https://github.com/rust-lang/rust/pull/74150/
811 [73862]: https://github.com/rust-lang/rust/pull/73862/
812 [73887]: https://github.com/rust-lang/rust/pull/73887/
813 [73466]: https://github.com/rust-lang/rust/pull/73466/
814 [73516]: https://github.com/rust-lang/rust/pull/73516/
815 [73293]: https://github.com/rust-lang/rust/pull/73293/
816 [73007]: https://github.com/rust-lang/rust/pull/73007/
817 [73032]: https://github.com/rust-lang/rust/pull/73032/
818 [72920]: https://github.com/rust-lang/rust/pull/72920/
819 [72569]: https://github.com/rust-lang/rust/pull/72569/
820 [72583]: https://github.com/rust-lang/rust/pull/72583/
821 [72584]: https://github.com/rust-lang/rust/pull/72584/
822 [72717]: https://github.com/rust-lang/rust/pull/72717/
823 [72437]: https://github.com/rust-lang/rust/pull/72437/
824 [72445]: https://github.com/rust-lang/rust/pull/72445/
825 [72486]: https://github.com/rust-lang/rust/pull/72486/
826 [72493]: https://github.com/rust-lang/rust/pull/72493/
827 [72331]: https://github.com/rust-lang/rust/pull/72331/
828 [71896]: https://github.com/rust-lang/rust/pull/71896/
829 [71660]: https://github.com/rust-lang/rust/pull/71660/
830 [71322]: https://github.com/rust-lang/rust/pull/71322/
831 [70740]: https://github.com/rust-lang/rust/pull/70740/
832 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
833 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
834 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
835 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
836 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
839 Version 1.45.2 (2020-08-03)
840 ==========================
842 * [Fix bindings in tuple struct patterns][74954]
843 * [Fix track_caller integration with trait objects][74784]
845 [74954]: https://github.com/rust-lang/rust/issues/74954
846 [74784]: https://github.com/rust-lang/rust/issues/74784
849 Version 1.45.1 (2020-07-30)
850 ==========================
852 * [Fix const propagation with references.][73613]
853 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
854 * [Avoid spurious implicit region bound.][74509]
855 * [Install clippy on x.py install][74457]
857 [73613]: https://github.com/rust-lang/rust/pull/73613
858 [73078]: https://github.com/rust-lang/rust/issues/73078
859 [74509]: https://github.com/rust-lang/rust/pull/74509
860 [74457]: https://github.com/rust-lang/rust/pull/74457
863 Version 1.45.0 (2020-07-16)
864 ==========================
868 - [Out of range float to int conversions using `as` has been defined as a saturating
869 conversion.][71269] This was previously undefined behaviour, but you can use the
870 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
871 may be desirable in rare performance sensitive situations.
872 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
874 - [Function like procedural macros can now be used in expression, pattern, and statement
875 positions.][68717] This means you can now use a function-like procedural macro
876 anywhere you can use a declarative (`macro_rules!`) macro.
880 - [You can now override individual target features through the `target-feature`
881 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
882 equivalent to `-C target-feature=+avx2,+fma`.
883 - [Added the `force-unwind-tables` flag.][69984] This option allows
884 rustc to always generate unwind tables regardless of panic strategy.
885 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
886 to include LLVM bitcode into generated `rlib`s (this is on by default).
887 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
888 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
889 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
890 - [Upgraded to LLVM 10.][67759]
892 \* Refer to Rust's [platform support page][platform-support-doc] for more
893 information on Rust's tiered platform support.
898 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
900 - [`proc_macro::TokenStream` now implements `Default`.][72234]
901 - [You can now use `char` with
902 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
903 a range of codepoints.][72413] E.g.
904 you can now write the following;
906 for ch in 'a'..='z' {
910 // Prints "abcdefghijklmnopqrstuvwxyz"
912 - [`OsString` now implements `FromStr`.][71662]
913 - [The `saturating_neg` method has been added to all signed integer primitive
914 types, and the `saturating_abs` method has been added for all integer
915 primitive types.][71886]
916 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
917 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
919 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
920 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
921 integer types.][69813]
922 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
923 integer types.][72324]
924 - [The `fetch_update` method has been added to all atomic integer types.][71843]
929 - [`BTreeMap::remove_entry`]
931 - [`rc::Weak::as_ptr`]
932 - [`rc::Weak::from_raw`]
933 - [`rc::Weak::into_raw`]
934 - [`str::strip_prefix`]
935 - [`str::strip_suffix`]
936 - [`sync::Weak::as_ptr`]
937 - [`sync::Weak::from_raw`]
938 - [`sync::Weak::into_raw`]
939 - [`char::UNICODE_VERSION`]
940 - [`Span::resolved_at`]
941 - [`Span::located_at`]
942 - [`Span::mixed_site`]
943 - [`unix::process::CommandExt::arg0`]
948 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
953 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
954 `~~outdated information~~` becomes "~~outdated information~~".
955 - [Added an emoji to Rustdoc's deprecated API message.][72014]
959 - [Trying to self initialize a static value (that is creating a value using
960 itself) is unsound and now causes a compile error.][71140]
961 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
962 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
963 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
964 previously undocumented and not intended for public use. Rustdoc still provides
965 a non-zero exit code on errors.
966 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
967 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
968 flags while cargo is adding `embed-bitcode` itself. The recommended way to
969 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
970 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
974 - [Make clippy a git subtree instead of a git submodule][70655]
975 - [Unify the undo log of all snapshot types][69464]
977 [71848]: https://github.com/rust-lang/rust/issues/71848/
978 [73420]: https://github.com/rust-lang/rust/issues/73420/
979 [72324]: https://github.com/rust-lang/rust/pull/72324/
980 [71843]: https://github.com/rust-lang/rust/pull/71843/
981 [71886]: https://github.com/rust-lang/rust/pull/71886/
982 [72234]: https://github.com/rust-lang/rust/pull/72234/
983 [72239]: https://github.com/rust-lang/rust/pull/72239/
984 [72397]: https://github.com/rust-lang/rust/pull/72397/
985 [72413]: https://github.com/rust-lang/rust/pull/72413/
986 [72014]: https://github.com/rust-lang/rust/pull/72014/
987 [72062]: https://github.com/rust-lang/rust/pull/72062/
988 [72094]: https://github.com/rust-lang/rust/pull/72094/
989 [72133]: https://github.com/rust-lang/rust/pull/72133/
990 [67759]: https://github.com/rust-lang/rust/pull/67759/
991 [71900]: https://github.com/rust-lang/rust/pull/71900/
992 [71928]: https://github.com/rust-lang/rust/pull/71928/
993 [71662]: https://github.com/rust-lang/rust/pull/71662/
994 [71716]: https://github.com/rust-lang/rust/pull/71716/
995 [71447]: https://github.com/rust-lang/rust/pull/71447/
996 [71269]: https://github.com/rust-lang/rust/pull/71269/
997 [71095]: https://github.com/rust-lang/rust/pull/71095/
998 [71140]: https://github.com/rust-lang/rust/pull/71140/
999 [70655]: https://github.com/rust-lang/rust/pull/70655/
1000 [70705]: https://github.com/rust-lang/rust/pull/70705/
1001 [69984]: https://github.com/rust-lang/rust/pull/69984/
1002 [69813]: https://github.com/rust-lang/rust/pull/69813/
1003 [69464]: https://github.com/rust-lang/rust/pull/69464/
1004 [68717]: https://github.com/rust-lang/rust/pull/68717/
1005 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1006 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1007 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1008 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1009 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1010 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1011 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1012 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1013 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1014 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1015 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1016 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1017 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1018 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1019 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1020 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1021 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1024 Version 1.44.1 (2020-06-18)
1025 ===========================
1027 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1028 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1029 * [Fix crashes when finding backtrace on macOS.][71397]
1030 * [Clippy applies lint levels into different files.][clippy/5356]
1032 [71397]: https://github.com/rust-lang/rust/issues/71397
1033 [73078]: https://github.com/rust-lang/rust/issues/73078
1034 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1035 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1038 Version 1.44.0 (2020-06-04)
1039 ==========================
1043 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1044 - [Added the `unused_braces` lint.][70081]
1046 **Syntax-only changes**
1048 - [Expansion-driven outline module parsing][69838]
1053 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1058 These are still rejected semantically, so you will likely receive an error but
1059 these changes can be seen and parsed by macros and conditional compilation.
1063 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1064 Additionally when in incremental mode rustc defaults to 256 codegen units.
1065 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1066 a panic is thrown.][67502]
1067 - [Added tier 3\* support for the `aarch64-unknown-none` and
1068 `aarch64-unknown-none-softfloat` targets.][68334]
1069 - [Added tier 3 support for `arm64-apple-tvos` and
1070 `x86_64-apple-tvos` targets.][68191]
1075 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1076 `vec![]` to be able to be used in `const` contexts.
1077 - [`convert::Infallible` now implements `Hash`.][70281]
1078 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1079 a `&mut OsStr`.][70048]
1080 - [Unicode 13 is now supported.][69929]
1081 - [`String` now implements `From<&mut str>`.][69661]
1082 - [`IoSlice` now implements `Copy`.][69403]
1083 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1084 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1085 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1086 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1087 integer types.][69373]
1091 - [`PathBuf::with_capacity`]
1092 - [`PathBuf::capacity`]
1093 - [`PathBuf::clear`]
1094 - [`PathBuf::reserve`]
1095 - [`PathBuf::reserve_exact`]
1096 - [`PathBuf::shrink_to_fit`]
1097 - [`f32::to_int_unchecked`]
1098 - [`f64::to_int_unchecked`]
1099 - [`Layout::align_to`]
1100 - [`Layout::pad_to_align`]
1102 - [`Layout::extend`]
1106 - [Added the `cargo tree` command which will print a tree graph of
1107 your dependencies.][cargo/8062] E.g.
1109 mdbook v0.3.2 (/Users/src/rust/mdbook)
1111 │ ├── html5ever v0.24.0
1113 │ │ │ └── cfg-if v0.1.9
1115 │ │ └── markup5ever v0.9.0
1116 │ │ ├── log v0.4.8 (*)
1118 │ │ │ └── phf_shared v0.7.24
1119 │ │ │ ├── siphasher v0.2.3
1120 │ │ │ └── unicase v1.4.2
1121 │ │ │ [build-dependencies]
1122 │ │ │ └── version_check v0.1.5
1125 You can also display dependencies on multiple versions of the same crate with
1126 `cargo tree -d` (short for `cargo tree --duplicates`).
1130 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1131 the version in the sidebar.][69494]
1135 - [Rustc now correctly generates static libraries on Windows GNU targets with
1136 the `.a` extension, rather than the previous `.lib`.][70937]
1137 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1138 - [The `file_name` property in JSON output of macro errors now points the actual
1139 source file rather than the previous format of `<NAME macros>`.][70969]
1140 **Note:** this may not point to a file that actually exists on the user's system.
1141 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1142 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1143 not allow zero initialization such as `NonZeroU8`.][66059] This was
1144 previously a warning.
1145 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1146 operator has been defined as a saturating operation.][71269] This was previously
1147 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1148 continue using the current behaviour, which may be desirable in rare performance
1149 sensitive situations.
1153 These changes provide no direct user facing benefits, but represent significant
1154 improvements to the internals and overall performance of rustc and
1157 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1158 - [Replace big JS dict with JSON parsing.][71250]
1160 [69373]: https://github.com/rust-lang/rust/pull/69373/
1161 [66059]: https://github.com/rust-lang/rust/pull/66059/
1162 [68191]: https://github.com/rust-lang/rust/pull/68191/
1163 [68899]: https://github.com/rust-lang/rust/pull/68899/
1164 [71147]: https://github.com/rust-lang/rust/pull/71147/
1165 [71250]: https://github.com/rust-lang/rust/pull/71250/
1166 [70937]: https://github.com/rust-lang/rust/pull/70937/
1167 [70969]: https://github.com/rust-lang/rust/pull/70969/
1168 [70632]: https://github.com/rust-lang/rust/pull/70632/
1169 [70281]: https://github.com/rust-lang/rust/pull/70281/
1170 [70345]: https://github.com/rust-lang/rust/pull/70345/
1171 [70048]: https://github.com/rust-lang/rust/pull/70048/
1172 [70081]: https://github.com/rust-lang/rust/pull/70081/
1173 [70156]: https://github.com/rust-lang/rust/pull/70156/
1174 [71269]: https://github.com/rust-lang/rust/pull/71269/
1175 [69838]: https://github.com/rust-lang/rust/pull/69838/
1176 [69929]: https://github.com/rust-lang/rust/pull/69929/
1177 [69661]: https://github.com/rust-lang/rust/pull/69661/
1178 [69778]: https://github.com/rust-lang/rust/pull/69778/
1179 [69494]: https://github.com/rust-lang/rust/pull/69494/
1180 [69403]: https://github.com/rust-lang/rust/pull/69403/
1181 [69033]: https://github.com/rust-lang/rust/pull/69033/
1182 [68692]: https://github.com/rust-lang/rust/pull/68692/
1183 [68334]: https://github.com/rust-lang/rust/pull/68334/
1184 [67502]: https://github.com/rust-lang/rust/pull/67502/
1185 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1186 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1187 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1188 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1189 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1190 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1191 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1192 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1193 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1194 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1195 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1196 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1197 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1200 Version 1.43.1 (2020-05-07)
1201 ===========================
1203 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1204 * [Fixed the stabilization of AVX-512 features.][71473]
1205 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1207 [71430]: https://github.com/rust-lang/rust/pull/71430
1208 [71473]: https://github.com/rust-lang/rust/issues/71473
1209 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1212 Version 1.43.0 (2020-04-23)
1213 ==========================
1217 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1218 the type inferred correctly.][68129]
1219 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1221 **Syntax only changes**
1222 - [Allow `type Foo: Ord` syntactically.][69361]
1223 - [Fuse associated and extern items up to defaultness.][69194]
1224 - [Syntactically allow `self` in all `fn` contexts.][68764]
1225 - [Merge `fn` syntax + cleanup item parsing.][68728]
1226 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1227 For example, you may now write:
1229 macro_rules! mac_trait {
1239 These are still rejected *semantically*, so you will likely receive an error but
1240 these changes can be seen and parsed by macros and
1241 conditional compilation.
1246 - [You can now pass multiple lint flags to rustc to override the previous
1247 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1248 everything in the `unused` lint group except `unused-variables` which
1249 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1250 everything in the `unused` lint group **including** `unused-variables` since
1251 the allow flag is specified before the deny flag (and therefore overridden).
1252 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1253 if they are available on `windows-gnu`.][67429]
1254 - [rustc now buffers errors/warnings printed in JSON.][69227]
1258 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1259 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1260 respectively.][69538] **Note** These conversions are only available when `N`
1262 - [You can now use associated constants on floats and integers directly, rather
1263 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1264 `f32::NAN` with no imports.
1265 - [`u8::is_ascii` is now `const`.][68984]
1266 - [`String` now implements `AsMut<str>`.][68742]
1267 - [Added the `primitive` module to `std` and `core`.][67637] This module
1268 reexports Rust's primitive types. This is mainly useful in macros
1269 where you want avoid these types being shadowed.
1270 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1271 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1275 - [`Once::is_completed`]
1280 - [`iter::once_with`]
1284 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1285 your environment.][cargo/7823]
1286 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1287 executable path when running integration tests or benchmarks.][cargo/7697]
1288 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1289 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1293 - [Certain checks in the `const_err` lint were deemed unrelated to const
1294 evaluation][69185], and have been moved to the `unconditional_panic` and
1295 `arithmetic_overflow` lints.
1300 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1301 has been a warning since 1.36.0.
1302 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1303 led to some instances being accepted, and now correctly emits a hard error.
1305 [69340]: https://github.com/rust-lang/rust/pull/69340
1309 These changes provide no direct user facing benefits, but represent significant
1310 improvements to the internals and overall performance of `rustc` and
1313 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1314 - [Improved how rustc generates drop code.][67332]
1315 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1316 - [traits: preallocate 2 Vecs of known initial size][69022]
1317 - [Avoid exponential behaviour when relating types][68772]
1318 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1319 - [Improve performance of coherence checks][68966]
1320 - [Deduplicate types in the generator witness][68672]
1321 - [Invert control in struct_lint_level.][68725]
1323 [67332]: https://github.com/rust-lang/rust/pull/67332/
1324 [67429]: https://github.com/rust-lang/rust/pull/67429/
1325 [67637]: https://github.com/rust-lang/rust/pull/67637/
1326 [67642]: https://github.com/rust-lang/rust/pull/67642/
1327 [67878]: https://github.com/rust-lang/rust/pull/67878/
1328 [67885]: https://github.com/rust-lang/rust/pull/67885/
1329 [68129]: https://github.com/rust-lang/rust/pull/68129/
1330 [68672]: https://github.com/rust-lang/rust/pull/68672/
1331 [68725]: https://github.com/rust-lang/rust/pull/68725/
1332 [68728]: https://github.com/rust-lang/rust/pull/68728/
1333 [68738]: https://github.com/rust-lang/rust/pull/68738/
1334 [68742]: https://github.com/rust-lang/rust/pull/68742/
1335 [68764]: https://github.com/rust-lang/rust/pull/68764/
1336 [68772]: https://github.com/rust-lang/rust/pull/68772/
1337 [68943]: https://github.com/rust-lang/rust/pull/68943/
1338 [68952]: https://github.com/rust-lang/rust/pull/68952/
1339 [68966]: https://github.com/rust-lang/rust/pull/68966/
1340 [68984]: https://github.com/rust-lang/rust/pull/68984/
1341 [69022]: https://github.com/rust-lang/rust/pull/69022/
1342 [69185]: https://github.com/rust-lang/rust/pull/69185/
1343 [69194]: https://github.com/rust-lang/rust/pull/69194/
1344 [69201]: https://github.com/rust-lang/rust/pull/69201/
1345 [69227]: https://github.com/rust-lang/rust/pull/69227/
1346 [69548]: https://github.com/rust-lang/rust/pull/69548/
1347 [69256]: https://github.com/rust-lang/rust/pull/69256/
1348 [69361]: https://github.com/rust-lang/rust/pull/69361/
1349 [69366]: https://github.com/rust-lang/rust/pull/69366/
1350 [69538]: https://github.com/rust-lang/rust/pull/69538/
1351 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1352 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1353 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1354 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1355 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1356 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1357 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1358 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1361 Version 1.42.0 (2020-03-12)
1362 ==========================
1366 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1368 fn foo(words: &[&str]) {
1370 ["Hello", "World", "!", ..] => println!("Hello World!"),
1371 ["Foo", "Bar", ..] => println!("Baz"),
1372 rest => println!("{:?}", rest),
1376 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1377 that you can create an enum that has the exact layout and ABI of the type
1379 - [There are some *syntax-only* changes:][67131]
1380 - `default` is syntactically allowed before items in `trait` definitions.
1381 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1382 leave out their bodies in favor of `;`.
1383 - Bounds on associated types in `impl`s are now syntactically allowed
1384 (e.g. `type Foo: Ord;`).
1385 - `...` (the C-variadic type) may occur syntactically directly as the type of
1386 any function parameter.
1388 These are still rejected *semantically*, so you will likely receive an error
1389 but these changes can be seen and parsed by procedural macros and
1390 conditional compilation.
1394 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1395 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1396 - [`Option::{expect,unwrap}` and
1397 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1398 pointing to the location where they were called, rather than
1399 `core`'s internals. ][67887]
1401 \* Refer to Rust's [platform support page][platform-support-doc] for more
1402 information on Rust's tiered platform support.
1406 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1407 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1408 to implement `Sized`.][67935]
1409 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1410 - [`Layout::new` is now `const`.][66254]
1411 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1416 - [`CondVar::wait_while`]
1417 - [`CondVar::wait_timeout_while`]
1419 - [`DebugMap::value`]
1420 - [`ManuallyDrop::take`]
1422 - [`ptr::slice_from_raw_parts_mut`]
1423 - [`ptr::slice_from_raw_parts`]
1427 - [You no longer need to include `extern crate proc_macro;` to be able to
1428 `use proc_macro;` in the `2018` edition.][cargo/7700]
1432 - [`Error::description` has been deprecated, and its use will now produce a
1433 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1435 [68253]: https://github.com/rust-lang/rust/pull/68253/
1436 [68348]: https://github.com/rust-lang/rust/pull/68348/
1437 [67935]: https://github.com/rust-lang/rust/pull/67935/
1438 [68339]: https://github.com/rust-lang/rust/pull/68339/
1439 [68122]: https://github.com/rust-lang/rust/pull/68122/
1440 [67712]: https://github.com/rust-lang/rust/pull/67712/
1441 [67887]: https://github.com/rust-lang/rust/pull/67887/
1442 [67131]: https://github.com/rust-lang/rust/pull/67131/
1443 [67233]: https://github.com/rust-lang/rust/pull/67233/
1444 [66899]: https://github.com/rust-lang/rust/pull/66899/
1445 [66919]: https://github.com/rust-lang/rust/pull/66919/
1446 [66254]: https://github.com/rust-lang/rust/pull/66254/
1447 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1448 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1449 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1450 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1451 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1452 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1453 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1454 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1455 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1458 Version 1.41.1 (2020-02-27)
1459 ===========================
1461 * [Always check types of static items][69145]
1462 * [Always check lifetime bounds of `Copy` impls][69145]
1463 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1465 [69225]: https://github.com/rust-lang/rust/issues/69225
1466 [69145]: https://github.com/rust-lang/rust/pull/69145
1469 Version 1.41.0 (2020-01-30)
1470 ===========================
1475 - [You can now pass type parameters to foreign items when implementing
1476 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1477 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1478 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1479 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1480 - [You can now use any valid identifier in a `format_args` macro.][66847]
1481 Previously identifiers starting with an underscore were not allowed.
1482 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1483 enum variants.][66183] These are still rejected semantically, but
1484 can be seen and parsed by procedural macros and conditional compilation.
1489 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1490 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1491 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1492 - [You can now pass an arguments file passing the `@path` syntax
1493 to rustc.][66172] Note that the format differs somewhat from what is
1494 found in other tooling; please see [the documentation][argfile-docs] for
1496 - [You can now provide `--extern` flag without a path, indicating that it is
1497 available from the search path or specified with an `-L` flag.][64882]
1499 \* Refer to Rust's [platform support page][platform-support-doc] for more
1500 information on Rust's tiered platform support.
1502 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1507 - [The `core::panic` module is now stable.][66771] It was already stable
1509 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1510 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1511 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1516 - [`Result::map_or`]
1517 - [`Result::map_or_else`]
1518 - [`std::rc::Weak::weak_count`]
1519 - [`std::rc::Weak::strong_count`]
1520 - [`std::sync::Weak::weak_count`]
1521 - [`std::sync::Weak::strong_count`]
1526 - [Cargo will now document all the private items for binary crates
1527 by default.][cargo/7593]
1528 - [`cargo-install` will now reinstall the package if it detects that it is out
1529 of date.][cargo/7560]
1530 - [Cargo.lock now uses a more git friendly format that should help to reduce
1531 merge conflicts.][cargo/7579]
1532 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1533 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1534 optimisation level to `2` for debug builds. You can also use
1535 `[profile.<profile>.build-override]` to override build scripts and
1541 - [You can now specify `edition` in documentation code blocks to compile the block
1542 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1543 should be compiled the 2018 edition of Rust.
1544 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1545 current theme with `--check-theme`.][54733]
1546 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1551 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1552 Apple targets.][apple-32bit-drop] This means that the source code is still
1553 available to build, but the targets are no longer being tested and release
1554 binaries for those platforms will no longer be distributed by the Rust project.
1555 Please refer to the linked blog post for more information.
1557 [54733]: https://github.com/rust-lang/rust/pull/54733/
1558 [61351]: https://github.com/rust-lang/rust/pull/61351/
1559 [67255]: https://github.com/rust-lang/rust/pull/67255/
1560 [66661]: https://github.com/rust-lang/rust/pull/66661/
1561 [66771]: https://github.com/rust-lang/rust/pull/66771/
1562 [66847]: https://github.com/rust-lang/rust/pull/66847/
1563 [66238]: https://github.com/rust-lang/rust/pull/66238/
1564 [66277]: https://github.com/rust-lang/rust/pull/66277/
1565 [66325]: https://github.com/rust-lang/rust/pull/66325/
1566 [66172]: https://github.com/rust-lang/rust/pull/66172/
1567 [66183]: https://github.com/rust-lang/rust/pull/66183/
1568 [65879]: https://github.com/rust-lang/rust/pull/65879/
1569 [65013]: https://github.com/rust-lang/rust/pull/65013/
1570 [64882]: https://github.com/rust-lang/rust/pull/64882/
1571 [64325]: https://github.com/rust-lang/rust/pull/64325/
1572 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1573 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1574 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1575 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1576 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1577 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1578 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1579 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1580 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1581 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1582 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1584 Version 1.40.0 (2019-12-19)
1585 ===========================
1589 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1590 `const` contexts.][65188] e.g.
1593 pub struct Point(i32, i32);
1595 const ORIGIN: Point = {
1596 let constructor = Point;
1602 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1603 indicate that there may be variants or fields added in the future.][64639]
1604 For example this requires adding a wild-card branch (`_ => {}`) to any match
1605 statements on a non-exhaustive `enum`. [(RFC 2008)]
1606 - [You can now use function-like procedural macros in `extern` blocks and in
1607 type positions.][63931] e.g. `type Generated = macro!();`
1608 - [Function-like and attribute procedural macros can now emit
1609 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1610 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1611 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1612 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1616 - [Added tier 3 support\* for the
1617 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1618 - [Added tier 3 support for the
1619 `aarch64-unknown-none-softfloat` target.][64589]
1620 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1621 `mips64el-unknown-linux-muslabi64` targets.][65843]
1623 \* Refer to Rust's [platform support page][platform-support-doc] for more
1624 information on Rust's tiered platform support.
1628 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1632 - [`BTreeMap::get_key_value`]
1633 - [`HashMap::get_key_value`]
1634 - [`Option::as_deref_mut`]
1635 - [`Option::as_deref`]
1636 - [`Option::flatten`]
1637 - [`UdpSocket::peer_addr`]
1638 - [`f32::to_be_bytes`]
1639 - [`f32::to_le_bytes`]
1640 - [`f32::to_ne_bytes`]
1641 - [`f64::to_be_bytes`]
1642 - [`f64::to_le_bytes`]
1643 - [`f64::to_ne_bytes`]
1644 - [`f32::from_be_bytes`]
1645 - [`f32::from_le_bytes`]
1646 - [`f32::from_ne_bytes`]
1647 - [`f64::from_be_bytes`]
1648 - [`f64::from_le_bytes`]
1649 - [`f64::from_ne_bytes`]
1656 - [Cargo will now always display warnings, rather than only on
1657 fresh builds.][cargo/7450]
1658 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1659 now produce an error.][cargo/7507] Previously these flags were ignored.
1660 - [You can now publish `dev-dependencies` without including
1661 a `version`.][cargo/7333]
1665 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1666 when running documentation tests with `rustdoc`.][63803]
1670 - [As previously announced, any previous NLL warnings in the 2015 edition are
1671 now hard errors.][64221]
1672 - [The `include!` macro will now warn if it failed to include the
1673 entire file.][64284] The `include!` macro unintentionally only includes the
1674 first _expression_ in a file, and this can be unintuitive. This will become
1675 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1676 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1677 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1678 or `extern` blocks now correctly emits a hard error.
1680 [65294]: https://github.com/rust-lang/rust/pull/65294/
1681 [66103]: https://github.com/rust-lang/rust/pull/66103/
1682 [65843]: https://github.com/rust-lang/rust/pull/65843/
1683 [65188]: https://github.com/rust-lang/rust/pull/65188/
1684 [65092]: https://github.com/rust-lang/rust/pull/65092/
1685 [64589]: https://github.com/rust-lang/rust/pull/64589/
1686 [64639]: https://github.com/rust-lang/rust/pull/64639/
1687 [64221]: https://github.com/rust-lang/rust/pull/64221/
1688 [64284]: https://github.com/rust-lang/rust/pull/64284/
1689 [63931]: https://github.com/rust-lang/rust/pull/63931/
1690 [64035]: https://github.com/rust-lang/rust/pull/64035/
1691 [63674]: https://github.com/rust-lang/rust/pull/63674/
1692 [63803]: https://github.com/rust-lang/rust/pull/63803/
1693 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1694 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1695 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1696 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1697 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1698 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1699 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1700 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1701 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1702 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1703 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1704 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1705 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1706 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1707 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1708 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1709 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1710 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1711 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1712 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1713 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1714 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1715 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1716 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1717 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1718 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1721 Version 1.39.0 (2019-11-07)
1722 ===========================
1726 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1727 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1728 - [You can now use certain attributes on function, closure, and function pointer
1729 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1730 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1731 attributes applied to items. e.g.
1734 #[cfg(windows)] slice: &[u16],
1735 #[cfg(not(windows))] slice: &[u8],
1740 - [You can now take shared references to bind-by-move patterns in the `if` guards
1741 of `match` arms.][63118] e.g.
1744 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1748 // ---- `nums` is bound by move.
1749 if nums.iter().sum::<u8>() == 10
1750 // ^------ `.iter()` implicitly takes a reference to `nums`.
1753 // ----------- Legal as `nums` was bound by move and so we have ownership.
1755 _ => unreachable!(),
1764 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1765 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1766 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1767 **Note** Cargo currently doesn't use this feature. Refer to
1768 [cargo#7315][cargo/7315] to track this feature's progress.
1769 - [You can now pass `--show-output` argument to test binaries to print the
1770 output of successful tests.][62600]
1773 \* Refer to Rust's [platform support page][platform-support-doc] for more
1774 information on Rust's tiered platform support.
1778 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1779 - [`LinkedList::new` is now a `const` function.][63684]
1780 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1781 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1782 now `const`.][63786]
1786 - [`Pin::into_inner`]
1787 - [`Instant::checked_duration_since`]
1788 - [`Instant::saturating_duration_since`]
1792 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1793 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1794 `--all` is now deprecated.
1798 - [You can now pass `-Clinker` to rustdoc to control the linker used
1799 for compiling doctests.][63834]
1803 - [Code that was previously accepted by the old borrow checker, but rejected by
1804 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1805 previously a warning, and will also become a hard error in the Rust 2015
1806 edition in the 1.40.0 release.
1807 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1808 run tests.][63827] This should improve performance when running a large
1810 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1811 recommended to use the `?` operator instead.
1812 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1815 [62600]: https://github.com/rust-lang/rust/pull/62600/
1816 [62672]: https://github.com/rust-lang/rust/pull/62672/
1817 [63118]: https://github.com/rust-lang/rust/pull/63118/
1818 [63209]: https://github.com/rust-lang/rust/pull/63209/
1819 [63402]: https://github.com/rust-lang/rust/pull/63402/
1820 [63565]: https://github.com/rust-lang/rust/pull/63565/
1821 [63595]: https://github.com/rust-lang/rust/pull/63595/
1822 [63684]: https://github.com/rust-lang/rust/pull/63684/
1823 [63698]: https://github.com/rust-lang/rust/pull/63698/
1824 [63770]: https://github.com/rust-lang/rust/pull/63770/
1825 [63786]: https://github.com/rust-lang/rust/pull/63786/
1826 [63827]: https://github.com/rust-lang/rust/pull/63827/
1827 [63834]: https://github.com/rust-lang/rust/pull/63834/
1828 [63927]: https://github.com/rust-lang/rust/pull/63927/
1829 [63933]: https://github.com/rust-lang/rust/pull/63933/
1830 [63934]: https://github.com/rust-lang/rust/pull/63934/
1831 [63938]: https://github.com/rust-lang/rust/pull/63938/
1832 [63940]: https://github.com/rust-lang/rust/pull/63940/
1833 [63941]: https://github.com/rust-lang/rust/pull/63941/
1834 [63945]: https://github.com/rust-lang/rust/pull/63945/
1835 [64010]: https://github.com/rust-lang/rust/pull/64010/
1836 [64028]: https://github.com/rust-lang/rust/pull/64028/
1837 [64334]: https://github.com/rust-lang/rust/pull/64334/
1838 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1839 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1840 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1841 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1842 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1843 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1845 Version 1.38.0 (2019-09-26)
1846 ==========================
1850 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1851 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1855 - [Added pipelined compilation support to `rustc`.][62766] This will
1856 improve compilation times in some cases. For further information please refer
1857 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1858 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1859 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1860 `x86_64-uwp-windows-msvc` targets.][60260]
1861 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1862 `armv7-unknown-linux-musleabi` targets.][63107]
1863 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1864 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1865 - [Upgraded to LLVM 9.][62592]
1867 \* Refer to Rust's [platform support page][platform-support-doc] for more
1868 information on Rust's tiered platform support.
1872 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1873 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1874 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1875 is available at `std::clone::Clone`). This also makes all built-in macros
1876 available in `std`/`core` root. e.g. `std::include_bytes!`.
1877 - [`str::Chars` now implements `Debug`.][63000]
1878 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1879 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1880 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1881 - [Added euclidean remainder and division operations (`div_euclid`,
1882 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1883 `overflowing`, and `wrapping` versions are available for all
1885 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1886 `PartialEq`.][61491]
1887 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1891 - [`<*const T>::cast`]
1892 - [`<*mut T>::cast`]
1893 - [`Duration::as_secs_f32`]
1894 - [`Duration::as_secs_f64`]
1895 - [`Duration::div_f32`]
1896 - [`Duration::div_f64`]
1897 - [`Duration::from_secs_f32`]
1898 - [`Duration::from_secs_f64`]
1899 - [`Duration::mul_f32`]
1900 - [`Duration::mul_f64`]
1901 - [`any::type_name`]
1905 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1906 - [You can now pass the `--features` option multiple times to enable
1907 multiple features.][cargo/7084]
1912 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
1916 - [`rustc` will now warn about some incorrect uses of
1917 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1921 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1923 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1924 issues][62896] with certain crates such as libc.
1926 [60260]: https://github.com/rust-lang/rust/pull/60260/
1927 [61457]: https://github.com/rust-lang/rust/pull/61457/
1928 [61491]: https://github.com/rust-lang/rust/pull/61491/
1929 [61884]: https://github.com/rust-lang/rust/pull/61884/
1930 [61953]: https://github.com/rust-lang/rust/pull/61953/
1931 [62042]: https://github.com/rust-lang/rust/pull/62042/
1932 [62528]: https://github.com/rust-lang/rust/pull/62528/
1933 [62583]: https://github.com/rust-lang/rust/pull/62583/
1934 [62735]: https://github.com/rust-lang/rust/pull/62735/
1935 [62766]: https://github.com/rust-lang/rust/pull/62766/
1936 [62784]: https://github.com/rust-lang/rust/pull/62784/
1937 [62592]: https://github.com/rust-lang/rust/pull/62592/
1938 [62785]: https://github.com/rust-lang/rust/issues/62785/
1939 [62814]: https://github.com/rust-lang/rust/pull/62814/
1940 [62896]: https://github.com/rust-lang/rust/issues/62896/
1941 [63000]: https://github.com/rust-lang/rust/pull/63000/
1942 [63056]: https://github.com/rust-lang/rust/pull/63056/
1943 [63107]: https://github.com/rust-lang/rust/pull/63107/
1944 [63346]: https://github.com/rust-lang/rust/pull/63346/
1945 [63421]: https://github.com/rust-lang/rust/pull/63421/
1946 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1947 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1948 [63048]: https://github.com/rust-lang/rust/pull/63048
1949 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1950 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1951 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1952 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1953 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1954 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1955 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1956 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1957 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1958 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1959 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1960 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
1961 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1963 Version 1.37.0 (2019-08-15)
1964 ==========================
1968 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1969 [`Box`][62228], or an [array][62235] and unused.
1970 - [You can now use the `cfg` and `cfg_attr` attributes on
1971 generic parameters.][61547]
1972 - [You can now use enum variants through type alias.][61682] e.g. You can
1973 write the following:
1975 type MyOption = Option<u8>;
1977 fn increment_or_zero(x: MyOption) -> u8 {
1979 MyOption::Some(y) => y + 1,
1980 MyOption::None => 0,
1984 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1985 `const _: u32 = 5;`.
1986 - [You can now use `#[repr(align(X)]` on enums.][61229]
1987 - [The `?` Kleene macro operator is now available in the
1988 2015 edition.][60932]
1992 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1993 and `-C profile-use` flags.][61268] For more information on how to use profile
1994 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1995 - [The `rust-lldb` wrapper script should now work again.][61827]
1999 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2003 - [`BufReader::buffer`]
2004 - [`BufWriter::buffer`]
2005 - [`Cell::from_mut`]
2006 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2007 - [`DoubleEndedIterator::nth_back`]
2009 - [`Wrapping::reverse_bits`]
2010 - [`i128::reverse_bits`]
2011 - [`i16::reverse_bits`]
2012 - [`i32::reverse_bits`]
2013 - [`i64::reverse_bits`]
2014 - [`i8::reverse_bits`]
2015 - [`isize::reverse_bits`]
2016 - [`slice::copy_within`]
2017 - [`u128::reverse_bits`]
2018 - [`u16::reverse_bits`]
2019 - [`u32::reverse_bits`]
2020 - [`u64::reverse_bits`]
2021 - [`u8::reverse_bits`]
2022 - [`usize::reverse_bits`]
2026 - [`Cargo.lock` files are now included by default when publishing executable crates
2027 with executables.][cargo/7026]
2028 - [You can now specify `default-run="foo"` in `[package]` to specify the
2029 default executable to use for `cargo run`.][cargo/7056]
2036 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2037 Please transition your code to using the `..=` syntax for inclusive
2039 - [Using a trait object without the `dyn` will now warn by default.][61203]
2040 Please transition your code to use `dyn Trait` for trait objects instead.
2042 [62228]: https://github.com/rust-lang/rust/pull/62228/
2043 [62235]: https://github.com/rust-lang/rust/pull/62235/
2044 [61802]: https://github.com/rust-lang/rust/pull/61802/
2045 [61827]: https://github.com/rust-lang/rust/pull/61827/
2046 [61547]: https://github.com/rust-lang/rust/pull/61547/
2047 [61682]: https://github.com/rust-lang/rust/pull/61682/
2048 [61268]: https://github.com/rust-lang/rust/pull/61268/
2049 [61342]: https://github.com/rust-lang/rust/pull/61342/
2050 [61347]: https://github.com/rust-lang/rust/pull/61347/
2051 [61100]: https://github.com/rust-lang/rust/pull/61100/
2052 [61203]: https://github.com/rust-lang/rust/pull/61203/
2053 [61229]: https://github.com/rust-lang/rust/pull/61229/
2054 [60932]: https://github.com/rust-lang/rust/pull/60932/
2055 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2056 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2057 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2058 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2059 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2060 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2061 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2062 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2063 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2064 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2065 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2066 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2067 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2068 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2069 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2070 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2071 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2072 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2073 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2074 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2075 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2076 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2077 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2078 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2081 Version 1.36.0 (2019-07-04)
2082 ==========================
2086 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2087 - [The order of traits in trait objects no longer affects the semantics of that
2088 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2089 `dyn fmt::Debug + Send`, where this was previously not the case.
2093 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2094 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2095 - [`mem::needs_drop` is now available as a const fn.][60364]
2096 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2097 - [`String` now implements `BorrowMut<str>`.][60404]
2098 - [`io::Cursor` now implements `Default`.][60234]
2099 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2100 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2101 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2102 environment has access to heap memory allocation.
2103 - [`String` now implements `From<&String>`.][59825]
2104 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2105 return a tuple of each argument when there is multiple arguments.
2106 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2111 - [`VecDeque::rotate_left`]
2112 - [`VecDeque::rotate_right`]
2113 - [`Iterator::copied`]
2115 - [`io::IoSliceMut`]
2116 - [`Read::read_vectored`]
2117 - [`Write::write_vectored`]
2118 - [`str::as_mut_ptr`]
2119 - [`mem::MaybeUninit`]
2120 - [`pointer::align_offset`]
2121 - [`future::Future`]
2123 - [`task::RawWaker`]
2124 - [`task::RawWakerVTable`]
2130 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2131 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2133 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2137 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2144 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2145 longer recommended, and will be deprecated in 1.39.0.
2147 [60318]: https://github.com/rust-lang/rust/pull/60318/
2148 [60364]: https://github.com/rust-lang/rust/pull/60364/
2149 [60370]: https://github.com/rust-lang/rust/pull/60370/
2150 [60404]: https://github.com/rust-lang/rust/pull/60404/
2151 [60234]: https://github.com/rust-lang/rust/pull/60234/
2152 [60244]: https://github.com/rust-lang/rust/pull/60244/
2153 [58623]: https://github.com/rust-lang/rust/pull/58623/
2154 [59648]: https://github.com/rust-lang/rust/pull/59648/
2155 [59675]: https://github.com/rust-lang/rust/pull/59675/
2156 [59825]: https://github.com/rust-lang/rust/pull/59825/
2157 [59826]: https://github.com/rust-lang/rust/pull/59826/
2158 [59445]: https://github.com/rust-lang/rust/pull/59445/
2159 [59114]: https://github.com/rust-lang/rust/pull/59114/
2160 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2161 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2162 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2163 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2164 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2165 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2166 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2167 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2168 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2169 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2170 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2171 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2172 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2173 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2174 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2175 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2176 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2177 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2178 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2179 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2182 Version 1.35.0 (2019-05-23)
2183 ==========================
2187 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2188 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2189 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2191 unsafe fn call_unsafe(func: unsafe fn()) {
2196 unsafe { call_unsafe(|| {}); }
2203 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2204 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2205 - [Added the `wasm32-unknown-wasi` target.][59464]
2210 - [`Thread` will now show its ID in `Debug` output.][59460]
2211 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2212 - [`alloc::System` now implements `Default`.][59451]
2213 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2215 - [`char::{ToLowercase, ToUppercase}` now
2216 implement `ExactSizeIterator`.][58778]
2217 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2218 - [Removed the `Read` trait bounds
2219 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2220 - [You can now call the `dbg!` macro without any parameters to print the file
2221 and line where it is called.][57847]
2222 - [In place ASCII case conversions are now up to 4× faster.][59283]
2223 e.g. `str::make_ascii_lowercase`
2224 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2231 - [`RefCell::replace_with`]
2232 - [`RefCell::map_split`]
2234 - [`Range::contains`]
2235 - [`RangeFrom::contains`]
2236 - [`RangeTo::contains`]
2237 - [`RangeInclusive::contains`]
2238 - [`RangeToInclusive::contains`]
2239 - [`Option::copied`]
2243 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2244 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2249 - [The Rust toolchain is now available natively for musl based distros.][58575]
2251 [59460]: https://github.com/rust-lang/rust/pull/59460/
2252 [59464]: https://github.com/rust-lang/rust/pull/59464/
2253 [59500]: https://github.com/rust-lang/rust/pull/59500/
2254 [59512]: https://github.com/rust-lang/rust/pull/59512/
2255 [59580]: https://github.com/rust-lang/rust/pull/59580/
2256 [59283]: https://github.com/rust-lang/rust/pull/59283/
2257 [59451]: https://github.com/rust-lang/rust/pull/59451/
2258 [59076]: https://github.com/rust-lang/rust/pull/59076/
2259 [58778]: https://github.com/rust-lang/rust/pull/58778/
2260 [58717]: https://github.com/rust-lang/rust/pull/58717/
2261 [58369]: https://github.com/rust-lang/rust/pull/58369/
2262 [58423]: https://github.com/rust-lang/rust/pull/58423/
2263 [58080]: https://github.com/rust-lang/rust/pull/58080/
2264 [57847]: https://github.com/rust-lang/rust/pull/57847/
2265 [58575]: https://github.com/rust-lang/rust/pull/58575
2266 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2267 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2268 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2269 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2270 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2271 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2272 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2273 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2274 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2275 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2276 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2277 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2279 Version 1.34.2 (2019-05-14)
2280 ===========================
2282 * [Destabilize the `Error::type_id` function due to a security
2283 vulnerability][60785] ([CVE-2019-12083])
2285 [60785]: https://github.com/rust-lang/rust/pull/60785
2286 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2288 Version 1.34.1 (2019-04-25)
2289 ===========================
2291 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2292 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2293 * [Fix Clippy panic when checking some macros][clippy/3805]
2295 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2296 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2297 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2299 Version 1.34.0 (2019-04-11)
2300 ==========================
2304 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2305 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2307 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2308 `#[attr{}]` procedural macros.][57367]
2309 - [You can now write `extern crate self as foo;`][57407] to import your
2310 crate's root into the extern prelude.
2315 - [You can now target `riscv64imac-unknown-none-elf` and
2316 `riscv64gc-unknown-none-elf`.][58406]
2317 - [You can now enable linker plugin LTO optimisations with
2318 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2319 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2321 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2326 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2327 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2328 the `Hash` trait to create an iterator.
2329 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2330 methods.][58421] Most notably you no longer require the `Ord` trait to create
2332 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2333 for all numeric types.][58044]
2334 - [Indexing a `str` is now generic over all types that
2335 implement `SliceIndex<str>`.][57604]
2336 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2337 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2338 produce a warning if their returning type is unused.
2339 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2340 `overflowing_pow` are now available for all numeric types.][57873] These are
2341 equivalent to methods such as `wrapping_add` for the `pow` operation.
2349 * [`Error::type_id`]
2350 * [`atomic::AtomicI16`]
2351 * [`atomic::AtomicI32`]
2352 * [`atomic::AtomicI64`]
2353 * [`atomic::AtomicI8`]
2354 * [`atomic::AtomicU16`]
2355 * [`atomic::AtomicU32`]
2356 * [`atomic::AtomicU64`]
2357 * [`atomic::AtomicU8`]
2358 * [`convert::Infallible`]
2359 * [`convert::TryFrom`]
2360 * [`convert::TryInto`]
2362 * [`iter::successors`]
2363 * [`num::NonZeroI128`]
2364 * [`num::NonZeroI16`]
2365 * [`num::NonZeroI32`]
2366 * [`num::NonZeroI64`]
2367 * [`num::NonZeroI8`]
2368 * [`num::NonZeroIsize`]
2369 * [`slice::sort_by_cached_key`]
2370 * [`str::escape_debug`]
2371 * [`str::escape_default`]
2372 * [`str::escape_unicode`]
2373 * [`str::split_ascii_whitespace`]
2376 * [`Instant::checked_add`]
2377 * [`Instant::checked_sub`]
2378 * [`SystemTime::checked_add`]
2379 * [`SystemTime::checked_sub`]
2383 - [You can now use alternative registries to crates.io.][cargo/6654]
2387 - [You can now use the `?` operator in your documentation tests without manually
2388 adding `fn main() -> Result<(), _> {}`.][56470]
2392 - [`Command::before_exec` is being replaced by the unsafe method
2393 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2394 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2395 can now use `const` functions in `static` variables.
2397 [58370]: https://github.com/rust-lang/rust/pull/58370/
2398 [58406]: https://github.com/rust-lang/rust/pull/58406/
2399 [58421]: https://github.com/rust-lang/rust/pull/58421/
2400 [58166]: https://github.com/rust-lang/rust/pull/58166/
2401 [58044]: https://github.com/rust-lang/rust/pull/58044/
2402 [58057]: https://github.com/rust-lang/rust/pull/58057/
2403 [58059]: https://github.com/rust-lang/rust/pull/58059/
2404 [57809]: https://github.com/rust-lang/rust/pull/57809/
2405 [57873]: https://github.com/rust-lang/rust/pull/57873/
2406 [57604]: https://github.com/rust-lang/rust/pull/57604/
2407 [57367]: https://github.com/rust-lang/rust/pull/57367/
2408 [57407]: https://github.com/rust-lang/rust/pull/57407/
2409 [57425]: https://github.com/rust-lang/rust/pull/57425/
2410 [57106]: https://github.com/rust-lang/rust/pull/57106/
2411 [56470]: https://github.com/rust-lang/rust/pull/56470/
2412 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2413 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2414 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2415 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2416 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2417 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2418 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2419 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2420 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2421 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2422 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2423 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2424 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2425 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2426 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2427 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2428 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2429 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2430 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2431 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2432 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2433 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2434 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2435 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2436 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2437 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2438 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2439 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2440 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2441 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2442 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2445 Version 1.33.0 (2019-02-28)
2446 ==========================
2450 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2451 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2452 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2453 E.g. You can have match statement on a `u8` that covers `0..=255` and
2454 you would no longer be required to have a `_ => unreachable!()` case.
2455 - [You can now have multiple patterns in `if let` and `while let`
2456 expressions.][57532] You can do this with the same syntax as a `match`
2466 let state = Creature::Crab("Ferris");
2468 if let Creature::Crab(name) | Creature::Person(name) = state {
2469 println!("This creature's name is: {}", name);
2473 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2474 this feature will by default produce a warning as this behaviour can be
2475 unintuitive. E.g. `if let _ = 5 {}`
2476 - [You can now use `let` bindings, assignments, expression statements,
2477 and irrefutable pattern destructuring in const functions.][57175]
2478 - [You can now call unsafe const functions.][57067] E.g.
2480 const unsafe fn foo() -> i32 { 5 }
2481 const fn bar() -> i32 {
2485 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2486 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2487 - [You can now specify a specific alignment with the `#[repr(packed)]`
2488 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2489 with an alignment of 2 bytes and a size of 6 bytes.
2490 - [You can now import an item from a module as an `_`.][56303] This allows you to
2491 import a trait's impls, and not have the name in the namespace. E.g.
2493 use std::io::Read as _;
2495 // Allowed as there is only one `Read` in the module.
2498 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2502 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2503 command line argument.][56351]
2504 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2505 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2506 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2507 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2508 information on Rust's platform support.
2509 - [Added support for the `thumbv7neon-linux-androideabi` and
2510 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2511 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2515 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2516 functions for all numeric types.][57566]
2517 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2518 are now `const` functions for all numeric types.][57105]
2519 - [The methods `is_positive` and `is_negative` are now `const` functions for
2520 all signed numeric types.][57105]
2521 - [The `get` method for all `NonZero` types is now `const`.][57167]
2522 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2523 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2524 numeric types.][57234]
2525 - [`Ipv4Addr::new` is now a `const` function][57234]
2529 - [`unix::FileExt::read_exact_at`]
2530 - [`unix::FileExt::write_all_at`]
2531 - [`Option::transpose`]
2532 - [`Result::transpose`]
2533 - [`convert::identity`]
2536 - [`marker::PhantomPinned`]
2537 - [`Vec::resize_with`]
2538 - [`VecDeque::resize_with`]
2539 - [`Duration::as_millis`]
2540 - [`Duration::as_micros`]
2541 - [`Duration::as_nanos`]
2546 - [You can now publish crates that require a feature flag to compile with
2547 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2548 - [Cargo should now rebuild a crate if a file was modified during the initial
2553 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2554 are now deprecated in the standard library, and their usage will now produce a warning.
2555 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2557 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2559 - [Libtest no longer creates a new thread for each test when
2560 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2562 [55982]: https://github.com/rust-lang/rust/pull/55982/
2563 [56243]: https://github.com/rust-lang/rust/pull/56243
2564 [56303]: https://github.com/rust-lang/rust/pull/56303/
2565 [56351]: https://github.com/rust-lang/rust/pull/56351/
2566 [56362]: https://github.com/rust-lang/rust/pull/56362
2567 [56642]: https://github.com/rust-lang/rust/pull/56642/
2568 [56769]: https://github.com/rust-lang/rust/pull/56769/
2569 [56805]: https://github.com/rust-lang/rust/pull/56805
2570 [56947]: https://github.com/rust-lang/rust/pull/56947/
2571 [57049]: https://github.com/rust-lang/rust/pull/57049/
2572 [57067]: https://github.com/rust-lang/rust/pull/57067/
2573 [57105]: https://github.com/rust-lang/rust/pull/57105
2574 [57130]: https://github.com/rust-lang/rust/pull/57130/
2575 [57167]: https://github.com/rust-lang/rust/pull/57167/
2576 [57175]: https://github.com/rust-lang/rust/pull/57175/
2577 [57234]: https://github.com/rust-lang/rust/pull/57234/
2578 [57332]: https://github.com/rust-lang/rust/pull/57332/
2579 [57465]: https://github.com/rust-lang/rust/pull/57465/
2580 [57532]: https://github.com/rust-lang/rust/pull/57532/
2581 [57535]: https://github.com/rust-lang/rust/pull/57535/
2582 [57566]: https://github.com/rust-lang/rust/pull/57566/
2583 [57615]: https://github.com/rust-lang/rust/pull/57615/
2584 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2585 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2586 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2587 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2588 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2589 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2590 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2591 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2592 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2593 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2594 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2595 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2596 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2597 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2598 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2599 [platform-support]: https://forge.rust-lang.org/platform-support.html
2601 Version 1.32.0 (2019-01-17)
2602 ==========================
2607 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2608 operator allows you to specify zero or one repetitions similar to the `*` and
2610 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2611 now always resolve to the item (`enum`, `struct`, etc.) available in the
2612 module if present, before resolving to a external crate or an item the prelude.][56759]
2615 enum Color { Red, Green, Blue }
2621 - [You can now match against `PhantomData<T>` types.][55837]
2622 - [You can now match against literals in macros with the `literal`
2623 specifier.][56072] This will match against a literal of any type.
2624 E.g. `1`, `'A'`, `"Hello World"`
2625 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2627 struct Point(i32, i32);
2630 pub fn new(x: i32, y: i32) -> Self {
2634 pub fn is_origin(&self) -> bool {
2642 - [Self can also now be used in type definitions.][56366] E.g.
2646 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2649 Cons(T, Box<Self>) // likewise here
2652 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2653 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2657 - [The default allocator has changed from jemalloc to the default allocator on
2658 your system.][55238] The compiler itself on Linux & macOS will still use
2659 jemalloc, but programs compiled with it will use the system allocator.
2660 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2664 - [`PathBuf` now implements `FromStr`.][55148]
2665 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2666 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2667 easily debug expressions in your rust program. E.g.
2670 let b = dbg!(a * 2) + 1;
2671 // ^-- prints: [src/main.rs:4] a * 2 = 4
2675 The following APIs are now `const` functions and can be used in a
2679 - [`UnsafeCell::get`]
2680 - [`char::is_ascii`]
2682 - [`ManuallyDrop::new`]
2683 - [`ManuallyDrop::into_inner`]
2684 - [`RangeInclusive::start`]
2685 - [`RangeInclusive::end`]
2686 - [`NonNull::as_ptr`]
2689 - [`Duration::as_secs`]
2690 - [`Duration::subsec_millis`]
2691 - [`Duration::subsec_micros`]
2692 - [`Duration::subsec_nanos`]
2694 - [`Ipv4Addr::is_unspecified`]
2696 - [`Ipv6Addr::octets`]
2700 - [`i8::to_be_bytes`]
2701 - [`i8::to_le_bytes`]
2702 - [`i8::to_ne_bytes`]
2703 - [`i8::from_be_bytes`]
2704 - [`i8::from_le_bytes`]
2705 - [`i8::from_ne_bytes`]
2706 - [`i16::to_be_bytes`]
2707 - [`i16::to_le_bytes`]
2708 - [`i16::to_ne_bytes`]
2709 - [`i16::from_be_bytes`]
2710 - [`i16::from_le_bytes`]
2711 - [`i16::from_ne_bytes`]
2712 - [`i32::to_be_bytes`]
2713 - [`i32::to_le_bytes`]
2714 - [`i32::to_ne_bytes`]
2715 - [`i32::from_be_bytes`]
2716 - [`i32::from_le_bytes`]
2717 - [`i32::from_ne_bytes`]
2718 - [`i64::to_be_bytes`]
2719 - [`i64::to_le_bytes`]
2720 - [`i64::to_ne_bytes`]
2721 - [`i64::from_be_bytes`]
2722 - [`i64::from_le_bytes`]
2723 - [`i64::from_ne_bytes`]
2724 - [`i128::to_be_bytes`]
2725 - [`i128::to_le_bytes`]
2726 - [`i128::to_ne_bytes`]
2727 - [`i128::from_be_bytes`]
2728 - [`i128::from_le_bytes`]
2729 - [`i128::from_ne_bytes`]
2730 - [`isize::to_be_bytes`]
2731 - [`isize::to_le_bytes`]
2732 - [`isize::to_ne_bytes`]
2733 - [`isize::from_be_bytes`]
2734 - [`isize::from_le_bytes`]
2735 - [`isize::from_ne_bytes`]
2736 - [`u8::to_be_bytes`]
2737 - [`u8::to_le_bytes`]
2738 - [`u8::to_ne_bytes`]
2739 - [`u8::from_be_bytes`]
2740 - [`u8::from_le_bytes`]
2741 - [`u8::from_ne_bytes`]
2742 - [`u16::to_be_bytes`]
2743 - [`u16::to_le_bytes`]
2744 - [`u16::to_ne_bytes`]
2745 - [`u16::from_be_bytes`]
2746 - [`u16::from_le_bytes`]
2747 - [`u16::from_ne_bytes`]
2748 - [`u32::to_be_bytes`]
2749 - [`u32::to_le_bytes`]
2750 - [`u32::to_ne_bytes`]
2751 - [`u32::from_be_bytes`]
2752 - [`u32::from_le_bytes`]
2753 - [`u32::from_ne_bytes`]
2754 - [`u64::to_be_bytes`]
2755 - [`u64::to_le_bytes`]
2756 - [`u64::to_ne_bytes`]
2757 - [`u64::from_be_bytes`]
2758 - [`u64::from_le_bytes`]
2759 - [`u64::from_ne_bytes`]
2760 - [`u128::to_be_bytes`]
2761 - [`u128::to_le_bytes`]
2762 - [`u128::to_ne_bytes`]
2763 - [`u128::from_be_bytes`]
2764 - [`u128::from_le_bytes`]
2765 - [`u128::from_ne_bytes`]
2766 - [`usize::to_be_bytes`]
2767 - [`usize::to_le_bytes`]
2768 - [`usize::to_ne_bytes`]
2769 - [`usize::from_be_bytes`]
2770 - [`usize::from_le_bytes`]
2771 - [`usize::from_ne_bytes`]
2775 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2776 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2780 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2784 - [The argument types for AVX's
2785 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2786 been changed from `*const` to `*mut` as the previous implementation
2790 [55148]: https://github.com/rust-lang/rust/pull/55148/
2791 [55238]: https://github.com/rust-lang/rust/pull/55238/
2792 [55280]: https://github.com/rust-lang/rust/pull/55280/
2793 [55610]: https://github.com/rust-lang/rust/pull/55610/
2794 [55663]: https://github.com/rust-lang/rust/pull/55663/
2795 [55702]: https://github.com/rust-lang/rust/pull/55702/
2796 [55837]: https://github.com/rust-lang/rust/pull/55837/
2797 [55843]: https://github.com/rust-lang/rust/pull/55843/
2798 [56072]: https://github.com/rust-lang/rust/pull/56072/
2799 [56245]: https://github.com/rust-lang/rust/pull/56245/
2800 [56365]: https://github.com/rust-lang/rust/pull/56365/
2801 [56366]: https://github.com/rust-lang/rust/pull/56366/
2802 [56395]: https://github.com/rust-lang/rust/pull/56395/
2803 [56759]: https://github.com/rust-lang/rust/pull/56759/
2804 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2805 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2806 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2807 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2808 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2809 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2810 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2811 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2812 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2813 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2814 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2815 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2816 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2817 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2818 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2819 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2820 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2821 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2822 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2823 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2824 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2825 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2826 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2827 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2828 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2829 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2830 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2831 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2832 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2833 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2834 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2835 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2836 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2837 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2838 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2839 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2840 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2841 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2842 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2843 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2844 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2845 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2846 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2847 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2848 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2849 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2850 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2851 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2852 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2853 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2854 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2855 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2856 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2857 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2858 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2859 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2860 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2861 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2862 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2863 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2864 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2865 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2866 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2867 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2868 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2869 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2870 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2871 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2872 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2873 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2874 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2875 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2876 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2877 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2878 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2879 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2880 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2881 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2882 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2883 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2884 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2885 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2886 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2887 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2888 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2889 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2890 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2891 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2892 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2893 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2894 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2895 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2896 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2899 Version 1.31.1 (2018-12-20)
2900 ===========================
2902 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2903 - [Fix broken go-to-definition in RLS][rls/1171]
2904 - [Fix infinite loop on hover in RLS][rls/1170]
2906 [56562]: https://github.com/rust-lang/rust/pull/56562
2907 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2908 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2910 Version 1.31.0 (2018-12-06)
2911 ==========================
2915 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2916 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2917 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2918 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2920 - [You can now define and use `const` functions.][54835] These are currently
2921 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2922 [language reference][const-reference] for what exactly is available.
2923 - [You can now use tool lints, which allow you to scope lints from external
2924 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2925 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2926 a crate, not just in exported functions.][54451]
2927 - [You can now use parentheses in pattern matches.][54497]
2931 - [Updated musl to 1.1.20][54430]
2935 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2936 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2937 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2938 into `Option<&mut T>` using the `From` trait.][53218]
2939 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2944 - [`slice::align_to`]
2945 - [`slice::align_to_mut`]
2946 - [`slice::chunks_exact`]
2947 - [`slice::chunks_exact_mut`]
2948 - [`slice::rchunks`]
2949 - [`slice::rchunks_mut`]
2950 - [`slice::rchunks_exact`]
2951 - [`slice::rchunks_exact_mut`]
2952 - [`Option::replace`]
2956 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2957 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2958 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2960 [52813]: https://github.com/rust-lang/rust/pull/52813/
2961 [53218]: https://github.com/rust-lang/rust/pull/53218/
2962 [53555]: https://github.com/rust-lang/rust/issues/53555/
2963 [54057]: https://github.com/rust-lang/rust/pull/54057/
2964 [54240]: https://github.com/rust-lang/rust/pull/54240/
2965 [54430]: https://github.com/rust-lang/rust/pull/54430/
2966 [54451]: https://github.com/rust-lang/rust/pull/54451/
2967 [54497]: https://github.com/rust-lang/rust/pull/54497/
2968 [54778]: https://github.com/rust-lang/rust/pull/54778/
2969 [54835]: https://github.com/rust-lang/rust/pull/54835/
2970 [54870]: https://github.com/rust-lang/rust/pull/54870/
2971 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2972 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2973 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2974 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2975 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2976 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2977 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2978 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2979 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2980 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2981 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2982 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2983 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2984 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2986 Version 1.30.1 (2018-11-08)
2987 ===========================
2989 - [Fixed overflow ICE in rustdoc][54199]
2990 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2992 [54199]: https://github.com/rust-lang/rust/pull/54199
2993 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2995 Version 1.30.0 (2018-10-25)
2996 ==========================
3000 - [Procedural macros are now available.][52081] These kinds of macros allow for
3001 more powerful code generation. There is a [new chapter available][proc-macros]
3002 in the Rust Programming Language book that goes further in depth.
3003 - [You can now use keywords as identifiers using the raw identifiers
3004 syntax (`r#`),][53236] e.g. `let r#for = true;`
3005 - [Using anonymous parameters in traits is now deprecated with a warning and
3006 will be a hard error in the 2018 edition.][53272]
3007 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3008 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3009 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3010 Previously, using a external crate in a module without a use statement
3011 required `let json = ::serde_json::from_str(foo);` but can now be written
3012 as `let json = serde_json::from_str(foo);`.
3013 - [You can now apply the `#[used]` attribute to static items to prevent the
3014 compiler from optimising them away, even if they appear to be unused,][51363]
3015 e.g. `#[used] static FOO: u32 = 1;`
3016 - [You can now import and reexport macros from other crates with the `use`
3017 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3018 the root module of the crate. If your macro relies on calling other local
3019 macros, it is recommended to export with the
3020 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3022 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3023 using the `vis` specifier.][53370]
3024 - [Non-macro attributes now allow all forms of literals, not just
3025 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3026 write `#[attr(true)]`.
3027 - [You can now specify a function to handle a panic in the Rust runtime with the
3028 `#[panic_handler]` attribute.][51366]
3032 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3033 - [Added the `aarch64-unknown-netbsd` target][53165]
3034 - [Upgraded to LLVM 8.][53611]
3038 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3042 - [`Ipv4Addr::BROADCAST`]
3043 - [`Ipv4Addr::LOCALHOST`]
3044 - [`Ipv4Addr::UNSPECIFIED`]
3045 - [`Ipv6Addr::LOCALHOST`]
3046 - [`Ipv6Addr::UNSPECIFIED`]
3047 - [`Iterator::find_map`]
3049 The following methods are replacement methods for `trim_left`, `trim_right`,
3050 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3052 - [`str::trim_end_matches`]
3054 - [`str::trim_start_matches`]
3055 - [`str::trim_start`]
3059 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3060 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3061 equivalent to calling `rustdoc --error-format=json`.
3062 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3066 - [`rustdoc` allows you to specify what edition to treat your code as with the
3067 `--edition` option.][54057]
3068 - [`rustdoc` now has the `--color` (specify whether to output color) and
3069 `--error-format` (specify error format, e.g. `json`) options.][53003]
3070 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3071 debug symbols.][53774]
3072 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3073 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3075 [50911]: https://github.com/rust-lang/rust/pull/50911/
3076 [51363]: https://github.com/rust-lang/rust/pull/51363/
3077 [51366]: https://github.com/rust-lang/rust/pull/51366/
3078 [52081]: https://github.com/rust-lang/rust/pull/52081/
3079 [53003]: https://github.com/rust-lang/rust/pull/53003/
3080 [53033]: https://github.com/rust-lang/rust/pull/53033/
3081 [53044]: https://github.com/rust-lang/rust/pull/53044/
3082 [53165]: https://github.com/rust-lang/rust/pull/53165/
3083 [53611]: https://github.com/rust-lang/rust/pull/53611/
3084 [53213]: https://github.com/rust-lang/rust/pull/53213/
3085 [53236]: https://github.com/rust-lang/rust/pull/53236/
3086 [53272]: https://github.com/rust-lang/rust/pull/53272/
3087 [53370]: https://github.com/rust-lang/rust/pull/53370/
3088 [53459]: https://github.com/rust-lang/rust/pull/53459/
3089 [53774]: https://github.com/rust-lang/rust/pull/53774/
3090 [53822]: https://github.com/rust-lang/rust/pull/53822/
3091 [54057]: https://github.com/rust-lang/rust/pull/54057/
3092 [54146]: https://github.com/rust-lang/rust/pull/54146/
3093 [54404]: https://github.com/rust-lang/rust/pull/54404/
3094 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3095 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3096 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3097 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3099 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3100 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3101 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3102 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3103 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3104 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3105 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3106 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3107 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3108 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3111 Version 1.29.2 (2018-10-11)
3112 ===========================
3114 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3115 - The `rls-preview` component on the windows-gnu targets has been restored.
3117 [54639]: https://github.com/rust-lang/rust/pull/54639
3120 Version 1.29.1 (2018-09-25)
3121 ===========================
3126 - The standard library's `str::repeat` function contained an out of bounds write
3127 caused by an integer overflow. This has been fixed by deterministically
3128 panicking when an overflow happens.
3130 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3134 Version 1.29.0 (2018-09-13)
3135 ==========================
3139 - [Bumped minimum LLVM version to 5.0.][51899]
3140 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3141 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3142 - [Upgraded to LLVM 7.][51966]
3146 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3147 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3148 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3149 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3151 - [`Cell<T>` now allows `T` to be unsized.][50494]
3152 - [`SocketAddr` is now stable on Redox.][52656]
3157 - [`Iterator::flatten`]
3162 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3163 `--locked` to disable this behavior.
3164 - [`cargo-install` will now allow you to cross compile an install
3165 using `--target`.][cargo/5614]
3166 - [Added the `cargo-fix` subcommand to automatically move project code from
3167 2015 edition to 2018.][cargo/5723]
3168 - [`cargo doc` can now optionally document private types using the
3169 `--document-private-items` flag.][cargo/5543]
3173 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3174 the specified level to that level.][52354] For example `--cap-lints warn`
3175 will demote `deny` and `forbid` lints to `warn`.
3176 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3177 fails and `101` if there is a panic.][52197]
3178 - [A preview of clippy has been made available through rustup.][51122]
3179 You can install the preview with `rustup component add clippy-preview`.
3183 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3184 Use `str::get_unchecked(begin..end)` instead.
3185 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3186 Consider using the `home_dir` function from
3187 https://crates.io/crates/dirs instead.
3188 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3189 - [`cfg` attributes and `--cfg` command line flags are now more
3190 strictly validated.][53893]
3192 [53893]: https://github.com/rust-lang/rust/pull/53893/
3193 [52861]: https://github.com/rust-lang/rust/pull/52861/
3194 [51966]: https://github.com/rust-lang/rust/pull/51966/
3195 [52656]: https://github.com/rust-lang/rust/pull/52656/
3196 [52239]: https://github.com/rust-lang/rust/pull/52239/
3197 [52330]: https://github.com/rust-lang/rust/pull/52330/
3198 [52354]: https://github.com/rust-lang/rust/pull/52354/
3199 [52402]: https://github.com/rust-lang/rust/pull/52402/
3200 [52103]: https://github.com/rust-lang/rust/pull/52103/
3201 [52197]: https://github.com/rust-lang/rust/pull/52197/
3202 [51807]: https://github.com/rust-lang/rust/pull/51807/
3203 [51899]: https://github.com/rust-lang/rust/pull/51899/
3204 [51912]: https://github.com/rust-lang/rust/pull/51912/
3205 [51511]: https://github.com/rust-lang/rust/pull/51511/
3206 [51619]: https://github.com/rust-lang/rust/pull/51619/
3207 [51656]: https://github.com/rust-lang/rust/pull/51656/
3208 [51178]: https://github.com/rust-lang/rust/pull/51178/
3209 [51122]: https://github.com/rust-lang/rust/pull/51122
3210 [50494]: https://github.com/rust-lang/rust/pull/50494/
3211 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3212 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3213 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3214 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3215 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3216 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3217 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3220 Version 1.28.0 (2018-08-02)
3221 ===========================
3225 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3226 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3227 the inner type across Foreign Function Interface (FFI) boundaries.
3228 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3229 and can now be used as identifiers.][51196]
3230 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3231 stable.][51241] This will allow users to specify a global allocator for
3233 - [Unit test functions marked with the `#[test]` attribute can now return
3234 `Result<(), E: Debug>` in addition to `()`.][51298]
3235 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3236 allows macros to easily target lifetimes.
3240 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3241 prioritise making smaller binary sizes. `z` is the same as `s` with the
3242 exception that it does not vectorise loops, which typically results in an even
3244 - [The short error format is now stable.][49546] Specified with
3245 `--error-format=short` this option will provide a more compressed output of
3246 rust error messages.
3247 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3248 - [Reduced the number of allocations in the macro parser.][50855] This can
3249 improve compile times of macro heavy crates on average by 5%.
3253 - [Implemented `Default` for `&mut str`.][51306]
3254 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3255 - [Implemented `Extend` for `()`.][50234]
3256 - [The `Debug` implementation of `time::Duration` should now be more easily
3257 human readable.][50364] Previously a `Duration` of one second would printed as
3258 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3259 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3260 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3261 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3262 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3263 for `PathBuf`.][50170]
3264 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3265 and `Wrapping<i128>`.][50465]
3266 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3267 possible.][51050] This can provide up to a 40% speed increase.
3268 - [Improved error messages when using `format!`.][50610]
3272 - [`Iterator::step_by`]
3273 - [`Path::ancestors`]
3274 - [`SystemTime::UNIX_EPOCH`]
3275 - [`alloc::GlobalAlloc`]
3277 - [`alloc::LayoutErr`]
3280 - [`alloc::alloc_zeroed`]
3281 - [`alloc::dealloc`]
3282 - [`alloc::realloc`]
3283 - [`alloc::handle_alloc_error`]
3284 - [`btree_map::Entry::or_default`]
3285 - [`fmt::Alignment`]
3286 - [`hash_map::Entry::or_default`]
3287 - [`iter::repeat_with`]
3288 - [`num::NonZeroUsize`]
3289 - [`num::NonZeroU128`]
3290 - [`num::NonZeroU16`]
3291 - [`num::NonZeroU32`]
3292 - [`num::NonZeroU64`]
3293 - [`num::NonZeroU8`]
3294 - [`ops::RangeBounds`]
3295 - [`slice::SliceIndex`]
3296 - [`slice::from_mut`]
3297 - [`slice::from_ref`]
3298 - [`{Any + Send + Sync}::downcast_mut`]
3299 - [`{Any + Send + Sync}::downcast_ref`]
3300 - [`{Any + Send + Sync}::is`]
3304 - [Cargo will now no longer allow you to publish crates with build scripts that
3305 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3306 considered to be immutable.
3310 - [The `suggestion_applicability` field in `rustc`'s json output is now
3311 stable.][50486] This will allow dev tools to check whether a code suggestion
3312 would apply to them.
3316 - [Rust will consider trait objects with duplicated constraints to be the same
3317 type as without the duplicated constraint.][51276] For example the below code will
3318 now fail to compile.
3323 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3326 impl Trait + Send + Send {
3327 fn test(&self) { println!("two"); }
3331 [49546]: https://github.com/rust-lang/rust/pull/49546/
3332 [50143]: https://github.com/rust-lang/rust/pull/50143/
3333 [50170]: https://github.com/rust-lang/rust/pull/50170/
3334 [50234]: https://github.com/rust-lang/rust/pull/50234/
3335 [50265]: https://github.com/rust-lang/rust/pull/50265/
3336 [50364]: https://github.com/rust-lang/rust/pull/50364/
3337 [50385]: https://github.com/rust-lang/rust/pull/50385/
3338 [50465]: https://github.com/rust-lang/rust/pull/50465/
3339 [50486]: https://github.com/rust-lang/rust/pull/50486/
3340 [50554]: https://github.com/rust-lang/rust/pull/50554/
3341 [50610]: https://github.com/rust-lang/rust/pull/50610/
3342 [50855]: https://github.com/rust-lang/rust/pull/50855/
3343 [51050]: https://github.com/rust-lang/rust/pull/51050/
3344 [51196]: https://github.com/rust-lang/rust/pull/51196/
3345 [51200]: https://github.com/rust-lang/rust/pull/51200/
3346 [51241]: https://github.com/rust-lang/rust/pull/51241/
3347 [51276]: https://github.com/rust-lang/rust/pull/51276/
3348 [51298]: https://github.com/rust-lang/rust/pull/51298/
3349 [51306]: https://github.com/rust-lang/rust/pull/51306/
3350 [51562]: https://github.com/rust-lang/rust/pull/51562/
3351 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3352 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3353 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3354 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3355 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3356 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3357 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3358 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3359 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3360 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3361 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3362 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3363 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3364 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3365 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3366 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3367 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3368 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3369 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3370 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3371 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3372 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3373 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3374 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3375 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3376 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3377 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3378 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3379 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3380 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3382 Version 1.27.2 (2018-07-20)
3383 ===========================
3388 - The borrow checker was fixed to avoid potential unsoundness when using
3389 match ergonomics: [#52213][52213].
3391 [52213]: https://github.com/rust-lang/rust/issues/52213
3393 Version 1.27.1 (2018-07-10)
3394 ===========================
3399 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3400 when running, which enabled executing code as some other user on a
3401 given machine. This release fixes that vulnerability; you can read
3402 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3404 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3409 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3410 match ergonomics: [#51415][51415], [#49534][49534].
3412 [51415]: https://github.com/rust-lang/rust/issues/51415
3413 [49534]: https://github.com/rust-lang/rust/issues/49534
3414 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3415 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3417 Version 1.27.0 (2018-06-21)
3418 ==========================
3422 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3423 be used as an identifier.
3424 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3425 bare `Trait` syntax, and should make it clearer when being used in tandem with
3426 `impl Trait` because it is equivalent to the following syntax:
3427 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3428 `Box<Trait> == Box<dyn Trait>`.
3429 - [Attributes on generic parameters such as types and lifetimes are
3430 now stable.][48851] e.g.
3431 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3432 - [The `#[must_use]` attribute can now also be used on functions as well as
3433 types.][48925] It provides a lint that by default warns users when the
3434 value returned by a function has not been used.
3438 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3442 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3443 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3444 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3445 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3446 the `cfg` attribute.
3447 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3448 std are now available in core.][49896]
3449 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3451 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3452 that the operation isn't done in place.
3453 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3454 the `#[must_use]` attribute][49533] to warn about unused potentially
3455 expensive allocations.
3459 - [`DoubleEndedIterator::rfind`]
3460 - [`DoubleEndedIterator::rfold`]
3461 - [`DoubleEndedIterator::try_rfold`]
3462 - [`Duration::from_micros`]
3463 - [`Duration::from_nanos`]
3464 - [`Duration::subsec_micros`]
3465 - [`Duration::subsec_millis`]
3466 - [`HashMap::remove_entry`]
3467 - [`Iterator::try_fold`]
3468 - [`Iterator::try_for_each`]
3470 - [`Option::filter`]
3471 - [`String::replace_range`]
3472 - [`Take::set_limit`]
3473 - [`hint::unreachable_unchecked`]
3474 - [`os::unix::process::parent_id`]
3475 - [`ptr::swap_nonoverlapping`]
3476 - [`slice::rsplit_mut`]
3478 - [`slice::swap_with_slice`]
3482 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3483 `readme`, and `repository` fields.][cargo/5386]
3484 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3485 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3486 a different directory than `target` for placing compilation artifacts.
3487 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3488 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3489 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3490 where cargo would infer a binary, Cargo will produce a warning. You can
3491 disable this feature ahead of time by setting any of the following to false:
3492 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3493 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3494 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3498 - [Added “The Rustc book” into the official documentation.][49707]
3499 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3500 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3504 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3505 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3506 compile, `"".is_empty()` will still compile.
3507 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3508 will only print the inner type.][48553] E.g.
3509 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3510 not `AtomicBool(true)`.
3511 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3512 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3513 alignment should cover all use cases.
3514 - The `.description()` method on the `std::error::Error` trait
3515 [has been soft-deprecated][50163]. It is no longer required to implement it.
3517 [48553]: https://github.com/rust-lang/rust/pull/48553/
3518 [48851]: https://github.com/rust-lang/rust/pull/48851/
3519 [48925]: https://github.com/rust-lang/rust/pull/48925/
3520 [49533]: https://github.com/rust-lang/rust/pull/49533/
3521 [49623]: https://github.com/rust-lang/rust/pull/49623/
3522 [49630]: https://github.com/rust-lang/rust/pull/49630/
3523 [49664]: https://github.com/rust-lang/rust/pull/49664/
3524 [49699]: https://github.com/rust-lang/rust/pull/49699/
3525 [49707]: https://github.com/rust-lang/rust/pull/49707/
3526 [49719]: https://github.com/rust-lang/rust/pull/49719/
3527 [49896]: https://github.com/rust-lang/rust/pull/49896/
3528 [49968]: https://github.com/rust-lang/rust/pull/49968/
3529 [50163]: https://github.com/rust-lang/rust/pull/50163
3530 [50177]: https://github.com/rust-lang/rust/pull/50177/
3531 [50378]: https://github.com/rust-lang/rust/pull/50378/
3532 [50398]: https://github.com/rust-lang/rust/pull/50398/
3533 [50423]: https://github.com/rust-lang/rust/pull/50423/
3534 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3535 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3536 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3537 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3538 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3539 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3540 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3541 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3542 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3543 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3544 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3545 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3546 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3547 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3548 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3549 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3550 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3551 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3552 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3553 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3554 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3555 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3556 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3557 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3558 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3559 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3560 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3561 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3562 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3563 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3566 Version 1.26.2 (2018-06-05)
3567 ==========================
3572 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3574 [51117]: https://github.com/rust-lang/rust/issues/51117
3577 Version 1.26.1 (2018-05-29)
3578 ==========================
3583 - [RLS now works on Windows.][50646]
3584 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3590 - [`fn main() -> impl Trait` no longer works for non-Termination
3592 This reverts an accidental stabilization.
3593 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3594 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3596 [50646]: https://github.com/rust-lang/rust/issues/50646
3597 [50656]: https://github.com/rust-lang/rust/pull/50656
3598 [50812]: https://github.com/rust-lang/rust/pull/50812
3599 [50950]: https://github.com/rust-lang/rust/issues/50950
3600 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3602 Version 1.26.0 (2018-05-10)
3603 ==========================
3607 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3608 implement either or both traits.][49299]
3609 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3610 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3611 lifetime can be elided.][49458]
3612 - [`impl Trait` is now stable allowing you to have abstract types in returns
3613 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3614 `fn open(path: impl AsRef<Path>)`.
3615 - [Pattern matching will now automatically apply dereferences.][49394]
3616 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3617 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3618 - [A lot of operations are now available in a const context.][46882] E.g. You
3619 can now index into constant arrays, reference and dereference into constants,
3620 and use tuple struct constructors.
3621 - [Fixed entry slice patterns are now stable.][48516] E.g.
3623 let points = [1, 2, 3, 4];
3625 [1, 2, 3, 4] => println!("All points were sequential."),
3626 _ => println!("Not all points were sequential."),
3633 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3634 - [Fixed exponential projection complexity on nested types.][48296]
3635 This can provide up to a ~12% reduction in compile times for certain crates.
3636 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3637 to remap path prefixes outputted by the compiler.
3638 - [Added `powerpc-unknown-netbsd` target.][48281]
3642 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3643 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3644 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3645 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3646 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3647 - [`ascii::escape_default` is now available in libcore.][48735]
3648 - [Trailing commas are now supported in std and core macros.][48056]
3649 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3650 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3655 - [`*const T::copy_to_nonoverlapping`]
3656 - [`*const T::copy_to`]
3657 - [`*const T::read_unaligned`]
3658 - [`*const T::read_volatile`]
3659 - [`*const T::read`]
3661 - [`*const T::wrapping_add`]
3662 - [`*const T::wrapping_sub`]
3664 - [`*mut T::copy_to_nonoverlapping`]
3665 - [`*mut T::copy_to`]
3666 - [`*mut T::read_unaligned`]
3667 - [`*mut T::read_volatile`]
3669 - [`*mut T::replace`]
3672 - [`*mut T::wrapping_add`]
3673 - [`*mut T::wrapping_sub`]
3674 - [`*mut T::write_bytes`]
3675 - [`*mut T::write_unaligned`]
3676 - [`*mut T::write_volatile`]
3679 - [`FromUtf8Error::as_bytes`]
3680 - [`LocalKey::try_with`]
3681 - [`Option::cloned`]
3682 - [`btree_map::Entry::and_modify`]
3683 - [`fs::read_to_string`]
3686 - [`hash_map::Entry::and_modify`]
3687 - [`iter::FusedIterator`]
3688 - [`ops::RangeInclusive`]
3689 - [`ops::RangeToInclusive`]
3691 - [`slice::rotate_left`]
3692 - [`slice::rotate_right`]
3693 - [`String::retain`]
3698 - [Cargo will now output path to custom commands when `-v` is
3699 passed with `--list`][cargo/5041]
3700 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3704 - [The second edition of "The Rust Programming Language" book is now recommended
3705 over the first.][48404]
3710 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3711 syntax is now invalid.
3713 use std::ops::Fn as dyn;
3714 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3716 - [The result of dereferences are no longer promoted to `'static`.][47408]
3720 const PAIR: &(i32, i32) = &(0, 1);
3721 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3724 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3725 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3727 - [Removed hoedown from rustdoc.][48274]
3728 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3730 [46882]: https://github.com/rust-lang/rust/pull/46882
3731 [47379]: https://github.com/rust-lang/rust/pull/47379
3732 [47408]: https://github.com/rust-lang/rust/pull/47408
3733 [47813]: https://github.com/rust-lang/rust/pull/47813
3734 [48056]: https://github.com/rust-lang/rust/pull/48056
3735 [48125]: https://github.com/rust-lang/rust/pull/48125
3736 [48166]: https://github.com/rust-lang/rust/pull/48166
3737 [48235]: https://github.com/rust-lang/rust/pull/48235
3738 [48274]: https://github.com/rust-lang/rust/pull/48274
3739 [48281]: https://github.com/rust-lang/rust/pull/48281
3740 [48296]: https://github.com/rust-lang/rust/pull/48296
3741 [48326]: https://github.com/rust-lang/rust/pull/48326
3742 [48359]: https://github.com/rust-lang/rust/pull/48359
3743 [48404]: https://github.com/rust-lang/rust/pull/48404
3744 [48481]: https://github.com/rust-lang/rust/pull/48481
3745 [48516]: https://github.com/rust-lang/rust/pull/48516
3746 [48628]: https://github.com/rust-lang/rust/pull/48628
3747 [48629]: https://github.com/rust-lang/rust/pull/48629
3748 [48657]: https://github.com/rust-lang/rust/pull/48657
3749 [48735]: https://github.com/rust-lang/rust/pull/48735
3750 [48978]: https://github.com/rust-lang/rust/pull/48978
3751 [49101]: https://github.com/rust-lang/rust/pull/49101
3752 [49109]: https://github.com/rust-lang/rust/pull/49109
3753 [49121]: https://github.com/rust-lang/rust/pull/49121
3754 [49162]: https://github.com/rust-lang/rust/pull/49162
3755 [49184]: https://github.com/rust-lang/rust/pull/49184
3756 [49234]: https://github.com/rust-lang/rust/pull/49234
3757 [49255]: https://github.com/rust-lang/rust/pull/49255
3758 [49299]: https://github.com/rust-lang/rust/pull/49299
3759 [49305]: https://github.com/rust-lang/rust/pull/49305
3760 [49394]: https://github.com/rust-lang/rust/pull/49394
3761 [49458]: https://github.com/rust-lang/rust/pull/49458
3762 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3763 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3764 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3765 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3766 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3767 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3768 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3769 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3770 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3771 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3772 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3773 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3774 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3775 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3776 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3777 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3778 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3779 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3780 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3781 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3782 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3783 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3784 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3785 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3786 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3787 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3788 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3789 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3790 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3791 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3792 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3793 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3794 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3795 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3796 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3797 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3798 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3799 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3800 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3801 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3802 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3803 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3806 Version 1.25.0 (2018-03-29)
3807 ==========================
3811 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3812 - [You can now use nested groups of imports.][47948]
3813 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3814 - [You can now have `|` at the start of a match arm.][47947] e.g.
3816 enum Foo { A, B, C }
3822 | Foo::B => println!("AB"),
3823 | Foo::C => println!("C"),
3830 - [Upgraded to LLVM 6.][47828]
3831 - [Added `-C lto=val` option.][47521]
3832 - [Added `i586-unknown-linux-musl` target][47282]
3836 - [Impl Send for `process::Command` on Unix.][47760]
3837 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3838 - [`UnsafeCell::into_inner` is now safe.][47204]
3839 - [Implement libstd for CloudABI.][47268]
3840 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3841 - [Implement `AsRef<Path>` for Component][46985]
3842 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3843 - [Moved `Duration` to libcore.][46666]
3847 - [`Location::column`]
3850 The following functions can now be used in a constant expression.
3851 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3852 - [`Duration::new`][47300]
3853 - [`Duration::from_secs`][47300]
3854 - [`Duration::from_millis`][47300]
3858 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3859 - [`cargo new` now defaults to creating a binary crate, instead of a
3860 library crate.][cargo/5029]
3864 - [Rust by example is now shipped with new releases][46196]
3868 - [Deprecated `net::lookup_host`.][47510]
3869 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3870 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3871 around indexing operations (see [#47349][47349]). This has been fixed (which also
3872 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3873 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3875 [33903]: https://github.com/rust-lang/rust/pull/33903
3876 [47947]: https://github.com/rust-lang/rust/pull/47947
3877 [47948]: https://github.com/rust-lang/rust/pull/47948
3878 [47760]: https://github.com/rust-lang/rust/pull/47760
3879 [47790]: https://github.com/rust-lang/rust/pull/47790
3880 [47828]: https://github.com/rust-lang/rust/pull/47828
3881 [47398]: https://github.com/rust-lang/rust/pull/47398
3882 [47510]: https://github.com/rust-lang/rust/pull/47510
3883 [47521]: https://github.com/rust-lang/rust/pull/47521
3884 [47204]: https://github.com/rust-lang/rust/pull/47204
3885 [47251]: https://github.com/rust-lang/rust/pull/47251
3886 [47268]: https://github.com/rust-lang/rust/pull/47268
3887 [47282]: https://github.com/rust-lang/rust/pull/47282
3888 [47300]: https://github.com/rust-lang/rust/pull/47300
3889 [47349]: https://github.com/rust-lang/rust/pull/47349
3890 [46931]: https://github.com/rust-lang/rust/pull/46931
3891 [46985]: https://github.com/rust-lang/rust/pull/46985
3892 [47006]: https://github.com/rust-lang/rust/pull/47006
3893 [46830]: https://github.com/rust-lang/rust/pull/46830
3894 [46095]: https://github.com/rust-lang/rust/pull/46095
3895 [46666]: https://github.com/rust-lang/rust/pull/46666
3896 [46196]: https://github.com/rust-lang/rust/pull/46196
3897 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3898 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3899 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3900 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3901 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3904 Version 1.24.1 (2018-03-01)
3905 ==========================
3907 - [Do not abort when unwinding through FFI][48251]
3908 - [Emit UTF-16 files for linker arguments on Windows][48318]
3909 - [Make the error index generator work again][48308]
3910 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3912 [48251]: https://github.com/rust-lang/rust/issues/48251
3913 [48308]: https://github.com/rust-lang/rust/issues/48308
3914 [48318]: https://github.com/rust-lang/rust/issues/48318
3915 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3918 Version 1.24.0 (2018-02-15)
3919 ==========================
3923 - [External `sysv64` ffi is now available.][46528]
3924 eg. `extern "sysv64" fn foo () {}`
3928 - [rustc now uses 16 codegen units by default for release builds.][46910]
3929 For the fastest builds, utilize `codegen-units=1`.
3930 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3931 - [Add `aarch64-unknown-openbsd` support][46760]
3935 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3936 improvement in performance in the majority of cases.
3937 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3938 with Windows.][46798]
3939 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3940 - [impl `From<bool>` for `AtomicBool`][46293]
3941 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3942 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3943 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3944 - [float::from_bits now just uses transmute.][46012] This provides
3945 some optimisations from LLVM.
3946 - [Copied `AsciiExt` methods onto `char`][46077]
3947 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3948 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3949 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3950 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3954 - [`RefCell::replace`]
3956 - [`atomic::spin_loop_hint`]
3958 The following functions can now be used in a constant expression.
3959 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3961 - [`AtomicBool::new`][46287]
3962 - [`AtomicUsize::new`][46287]
3963 - [`AtomicIsize::new`][46287]
3964 - [`AtomicPtr::new`][46287]
3965 - [`Cell::new`][46287]
3966 - [`{integer}::min_value`][46287]
3967 - [`{integer}::max_value`][46287]
3968 - [`mem::size_of`][46287]
3969 - [`mem::align_of`][46287]
3970 - [`ptr::null`][46287]
3971 - [`ptr::null_mut`][46287]
3972 - [`RefCell::new`][46287]
3973 - [`UnsafeCell::new`][46287]
3977 - [Added a `workspace.default-members` config that
3978 overrides implied `--all` in virtual workspaces.][cargo/4743]
3979 - [Enable incremental by default on development builds.][cargo/4817] Also added
3980 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3981 per-project or global basis respectively.
3988 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3989 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3990 in accordance with IETF RFC 4291 §2.2.
3991 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3992 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3993 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3994 - [Leading zeros in tuple struct members is now an error][47084]
3995 - [`column!()` macro is one-based instead of zero-based][46977]
3996 - [`fmt::Arguments` can no longer be shared across threads][45198]
3997 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3998 - [Cargo sets a different working directory for the compiler][cargo/4788]
4000 [44884]: https://github.com/rust-lang/rust/pull/44884
4001 [45198]: https://github.com/rust-lang/rust/pull/45198
4002 [45506]: https://github.com/rust-lang/rust/pull/45506
4003 [45904]: https://github.com/rust-lang/rust/pull/45904
4004 [45990]: https://github.com/rust-lang/rust/pull/45990
4005 [46012]: https://github.com/rust-lang/rust/pull/46012
4006 [46077]: https://github.com/rust-lang/rust/pull/46077
4007 [46094]: https://github.com/rust-lang/rust/pull/46094
4008 [46284]: https://github.com/rust-lang/rust/pull/46284
4009 [46287]: https://github.com/rust-lang/rust/pull/46287
4010 [46293]: https://github.com/rust-lang/rust/pull/46293
4011 [46528]: https://github.com/rust-lang/rust/pull/46528
4012 [46671]: https://github.com/rust-lang/rust/pull/46671
4013 [46713]: https://github.com/rust-lang/rust/pull/46713
4014 [46735]: https://github.com/rust-lang/rust/pull/46735
4015 [46749]: https://github.com/rust-lang/rust/pull/46749
4016 [46760]: https://github.com/rust-lang/rust/pull/46760
4017 [46798]: https://github.com/rust-lang/rust/pull/46798
4018 [46828]: https://github.com/rust-lang/rust/pull/46828
4019 [46831]: https://github.com/rust-lang/rust/pull/46831
4020 [46833]: https://github.com/rust-lang/rust/pull/46833
4021 [46910]: https://github.com/rust-lang/rust/pull/46910
4022 [46977]: https://github.com/rust-lang/rust/pull/46977
4023 [47018]: https://github.com/rust-lang/rust/pull/47018
4024 [47080]: https://github.com/rust-lang/rust/pull/47080
4025 [47084]: https://github.com/rust-lang/rust/pull/47084
4026 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4027 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4028 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4029 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4030 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4031 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4034 Version 1.23.0 (2018-01-04)
4035 ==========================
4039 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4040 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4041 Which should fix some confusing errors in some operations.
4045 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4046 undefined behavior.][45920]
4047 - [rustc now suggests renaming import if names clash.][45660]
4048 - [Display errors/warnings correctly when there are zero-width or
4049 wide characters.][45711]
4050 - [rustc now avoids unnecessary copies of arguments that are
4051 simple bindings][45380] This should improve memory usage on average by 5-10%.
4052 - [Updated musl used to build musl rustc to 1.1.17][45393]
4056 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4057 - [Implement Hash for raw pointers to unsized types][45483]
4058 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4059 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4060 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4061 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4062 and `<*mut T>::as_mut`][44932]
4063 - [Optimized `Thread::{park, unpark}` implementation][45524]
4064 - [Improved `SliceExt::binary_search` performance.][45333]
4065 - [impl `FromIterator<()>` for `()`][45379]
4066 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4074 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4075 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4076 - [Added unit test checking to `cargo check`][cargo/4592]
4077 - [Cargo now lets you install a specific version
4078 using `cargo install --version`][cargo/4637]
4082 - [Releases now ship with the Cargo book documentation.][45692]
4083 - [rustdoc now prints rendering warnings on every run.][45324]
4087 - [Changes have been made to type equality to make it more correct,
4088 in rare cases this could break some code.][45853] [Tracking issue for
4089 further information][45852]
4090 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4091 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4092 Android 9, the minimum supported version is Android 14.
4093 - [Bumped the minimum LLVM to 3.9][45326]
4095 [44042]: https://github.com/rust-lang/rust/pull/44042
4096 [44932]: https://github.com/rust-lang/rust/pull/44932
4097 [45267]: https://github.com/rust-lang/rust/pull/45267
4098 [45324]: https://github.com/rust-lang/rust/pull/45324
4099 [45326]: https://github.com/rust-lang/rust/pull/45326
4100 [45333]: https://github.com/rust-lang/rust/pull/45333
4101 [45379]: https://github.com/rust-lang/rust/pull/45379
4102 [45380]: https://github.com/rust-lang/rust/pull/45380
4103 [45393]: https://github.com/rust-lang/rust/pull/45393
4104 [45435]: https://github.com/rust-lang/rust/pull/45435
4105 [45483]: https://github.com/rust-lang/rust/pull/45483
4106 [45524]: https://github.com/rust-lang/rust/pull/45524
4107 [45571]: https://github.com/rust-lang/rust/pull/45571
4108 [45580]: https://github.com/rust-lang/rust/pull/45580
4109 [45610]: https://github.com/rust-lang/rust/pull/45610
4110 [45660]: https://github.com/rust-lang/rust/pull/45660
4111 [45692]: https://github.com/rust-lang/rust/pull/45692
4112 [45711]: https://github.com/rust-lang/rust/pull/45711
4113 [45772]: https://github.com/rust-lang/rust/pull/45772
4114 [45852]: https://github.com/rust-lang/rust/issues/45852
4115 [45853]: https://github.com/rust-lang/rust/pull/45853
4116 [45887]: https://github.com/rust-lang/rust/pull/45887
4117 [45920]: https://github.com/rust-lang/rust/pull/45920
4118 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4119 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4120 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4123 Version 1.22.1 (2017-11-22)
4124 ==========================
4126 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4128 [46183]: https://github.com/rust-lang/rust/pull/46183
4130 Version 1.22.0 (2017-11-22)
4131 ==========================
4135 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4136 - [Now accepts underscores in unicode escapes][43716]
4137 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4138 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4142 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4143 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4144 This should decrease compile times for debug builds.
4145 - [strict memory alignment now enabled on ARMv6][45094]
4146 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4150 - [Allow atomic operations up to 32 bits
4151 on `armv5te_unknown_linux_gnueabi`][44978]
4152 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4153 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4154 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4155 - [Properly detect overflow in `Instant += Duration`.][44220]
4156 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4157 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4158 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4165 - [Cargo will now build multi file examples in subdirectories of the `examples`
4166 folder that have a `main.rs` file.][cargo/4496]
4167 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4168 the old format will continue to work and can be updated with `cargo update`.
4169 - [Now supports vendoring git repositories][cargo/3992]
4173 - [`libbacktrace` is now available on Apple platforms.][44251]
4174 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4175 This now lets you specify that a given code example will fail to compile.
4179 - [The minimum Android version that rustc can build for has been bumped
4180 to `4.0` from `2.3`][45656]
4181 - [Allowing `T op= &T` for numeric types has broken some type
4182 inference cases][45480]
4185 [42526]: https://github.com/rust-lang/rust/pull/42526
4186 [43017]: https://github.com/rust-lang/rust/pull/43017
4187 [43716]: https://github.com/rust-lang/rust/pull/43716
4188 [43949]: https://github.com/rust-lang/rust/pull/43949
4189 [44015]: https://github.com/rust-lang/rust/pull/44015
4190 [44220]: https://github.com/rust-lang/rust/pull/44220
4191 [44251]: https://github.com/rust-lang/rust/pull/44251
4192 [44287]: https://github.com/rust-lang/rust/pull/44287
4193 [44303]: https://github.com/rust-lang/rust/pull/44303
4194 [44456]: https://github.com/rust-lang/rust/pull/44456
4195 [44466]: https://github.com/rust-lang/rust/pull/44466
4196 [44895]: https://github.com/rust-lang/rust/pull/44895
4197 [44966]: https://github.com/rust-lang/rust/pull/44966
4198 [44978]: https://github.com/rust-lang/rust/pull/44978
4199 [45041]: https://github.com/rust-lang/rust/pull/45041
4200 [45064]: https://github.com/rust-lang/rust/pull/45064
4201 [45075]: https://github.com/rust-lang/rust/pull/45075
4202 [45094]: https://github.com/rust-lang/rust/pull/45094
4203 [45095]: https://github.com/rust-lang/rust/pull/45095
4204 [45480]: https://github.com/rust-lang/rust/issues/45480
4205 [45656]: https://github.com/rust-lang/rust/pull/45656
4206 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4207 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4208 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4215 Version 1.21.0 (2017-10-12)
4216 ==========================
4220 - [You can now use static references for literals.][43838]
4224 let x: &'static u32 = &0;
4227 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4230 my_macro!(Vec<i32>::new); // Always worked
4231 my_macro!(Vec::<i32>::new); // Now works
4236 - [Upgraded jemalloc to 4.5.0][43911]
4237 - [Enabled unwinding panics on Redox][43917]
4238 - [Now runs LLVM in parallel during translation phase.][43506]
4239 This should reduce peak memory usage.
4243 - [Generate builtin impls for `Clone` for all arrays and tuples that
4244 are `T: Clone`][43690]
4245 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4246 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4247 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4252 [`std::mem::discriminant`]
4256 - [You can now call `cargo install` with multiple package names][cargo/4216]
4257 - [Cargo commands inside a virtual workspace will now implicitly
4258 pass `--all`][cargo/4335]
4259 - [Added a `[patch]` section to `Cargo.toml` to handle
4260 prepublication dependencies][cargo/4123] [RFC 1969]
4261 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4262 like patterns][cargo/4270]
4263 - [Added the `--all-targets` option][cargo/4400]
4264 - [Using required dependencies as a feature is now deprecated and emits
4265 a warning][cargo/4364]
4270 - [Cargo docs are moving][43916]
4271 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4272 - [The rustdoc book is now available][43863]
4273 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4274 - [Added a preview of RLS has been made available through rustup][44204]
4275 Install with `rustup component add rls-preview`
4276 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4277 Previously only showed `std::os::unix`.
4281 - [Changes in method matching against higher-ranked types][43880] This may cause
4282 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4283 - [rustc's JSON error output's byte position start at top of file.][42973]
4284 Was previously relative to the rustc's internal `CodeMap` struct which
4285 required the unstable library `libsyntax` to correctly use.
4286 - [`unused_results` lint no longer ignores booleans][43728]
4288 [42565]: https://github.com/rust-lang/rust/pull/42565
4289 [42973]: https://github.com/rust-lang/rust/pull/42973
4290 [43348]: https://github.com/rust-lang/rust/pull/43348
4291 [43459]: https://github.com/rust-lang/rust/pull/43459
4292 [43506]: https://github.com/rust-lang/rust/pull/43506
4293 [43540]: https://github.com/rust-lang/rust/pull/43540
4294 [43690]: https://github.com/rust-lang/rust/pull/43690
4295 [43728]: https://github.com/rust-lang/rust/pull/43728
4296 [43838]: https://github.com/rust-lang/rust/pull/43838
4297 [43863]: https://github.com/rust-lang/rust/pull/43863
4298 [43880]: https://github.com/rust-lang/rust/pull/43880
4299 [43911]: https://github.com/rust-lang/rust/pull/43911
4300 [43916]: https://github.com/rust-lang/rust/pull/43916
4301 [43917]: https://github.com/rust-lang/rust/pull/43917
4302 [44204]: https://github.com/rust-lang/rust/pull/44204
4303 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4304 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4305 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4306 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4307 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4308 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4309 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4310 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4311 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4313 Version 1.20.0 (2017-08-31)
4314 ===========================
4318 - [Associated constants are now stabilised.][42809]
4319 - [A lot of macro bugs are now fixed.][42913]
4324 - [Struct fields are now properly coerced to the expected field type.][42807]
4325 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4326 `wasm32-experimental-emscripten` target.
4327 - [Changed some of the error messages to be more helpful.][42033]
4328 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4330 - [rustc now reports the total number of errors on compilation failure][43015]
4331 previously this was only the number of errors in the pass that failed.
4332 - [Expansion in rustc has been sped up 29x.][42533]
4333 - [added `msp430-none-elf` target.][43099]
4334 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4336 - [Fixes backtraces on Redox][43228]
4337 - [rustc now identifies different versions of same crate when absolute paths of
4338 different types match in an error message.][42826]
4344 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4345 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4347 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4348 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4349 - [Impl `Clone` for `DefaultHasher`.][42799]
4350 - [Impl `Sync` for `SyncSender`.][42397]
4351 - [Impl `FromStr` for `char`][42271]
4352 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4354 - [allow messages in the `unimplemented!()` macro.][42155]
4355 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4356 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4357 - [Upgrade to Unicode 10.0.0][42999]
4358 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4359 - [Skip the main thread's manual stack guard on Linux][43072]
4360 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4361 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4363 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4368 - [`CStr::into_c_string`]
4369 - [`CString::as_c_str`]
4370 - [`CString::into_boxed_c_str`]
4371 - [`Chain::get_mut`]
4372 - [`Chain::get_ref`]
4373 - [`Chain::into_inner`]
4374 - [`Option::get_or_insert_with`]
4375 - [`Option::get_or_insert`]
4376 - [`OsStr::into_os_string`]
4377 - [`OsString::into_boxed_os_str`]
4380 - [`Utf8Error::error_len`]
4381 - [`char::EscapeDebug`]
4382 - [`char::escape_debug`]
4383 - [`compile_error!`]
4384 - [`f32::from_bits`]
4386 - [`f64::from_bits`]
4388 - [`mem::ManuallyDrop`]
4389 - [`slice::sort_unstable_by_key`]
4390 - [`slice::sort_unstable_by`]
4391 - [`slice::sort_unstable`]
4392 - [`str::from_boxed_utf8_unchecked`]
4393 - [`str::as_bytes_mut`]
4394 - [`str::as_bytes_mut`]
4395 - [`str::from_utf8_mut`]
4396 - [`str::from_utf8_unchecked_mut`]
4398 - [`str::get_unchecked_mut`]
4399 - [`str::get_unchecked`]
4401 - [`str::into_boxed_bytes`]
4406 - [Cargo API token location moved from `~/.cargo/config` to
4407 `~/.cargo/credentials`.][cargo/3978]
4408 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4409 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4410 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4411 - [You can now specify version of a binary when installed through
4412 `cargo install` using `--vers`.][cargo/4229]
4413 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4414 failure.][cargo/4248]
4415 - [Changed the convention around which file is the crate root.][cargo/4259]
4416 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4417 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4422 - [Functions with `'static` in their return types will now not be as usable as
4423 if they were using lifetime parameters instead.][42417]
4424 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4425 takes the sign of NaN into account where previously didn't.][42430]
4427 [42033]: https://github.com/rust-lang/rust/pull/42033
4428 [42155]: https://github.com/rust-lang/rust/pull/42155
4429 [42271]: https://github.com/rust-lang/rust/pull/42271
4430 [42397]: https://github.com/rust-lang/rust/pull/42397
4431 [42417]: https://github.com/rust-lang/rust/pull/42417
4432 [42430]: https://github.com/rust-lang/rust/pull/42430
4433 [42431]: https://github.com/rust-lang/rust/pull/42431
4434 [42533]: https://github.com/rust-lang/rust/pull/42533
4435 [42571]: https://github.com/rust-lang/rust/pull/42571
4436 [42613]: https://github.com/rust-lang/rust/pull/42613
4437 [42799]: https://github.com/rust-lang/rust/pull/42799
4438 [42807]: https://github.com/rust-lang/rust/pull/42807
4439 [42809]: https://github.com/rust-lang/rust/pull/42809
4440 [42822]: https://github.com/rust-lang/rust/pull/42822
4441 [42826]: https://github.com/rust-lang/rust/pull/42826
4442 [42854]: https://github.com/rust-lang/rust/pull/42854
4443 [42913]: https://github.com/rust-lang/rust/pull/42913
4444 [42999]: https://github.com/rust-lang/rust/pull/42999
4445 [43011]: https://github.com/rust-lang/rust/pull/43011
4446 [43015]: https://github.com/rust-lang/rust/pull/43015
4447 [43072]: https://github.com/rust-lang/rust/pull/43072
4448 [43077]: https://github.com/rust-lang/rust/pull/43077
4449 [43097]: https://github.com/rust-lang/rust/pull/43097
4450 [43099]: https://github.com/rust-lang/rust/pull/43099
4451 [43170]: https://github.com/rust-lang/rust/pull/43170
4452 [43178]: https://github.com/rust-lang/rust/pull/43178
4453 [43185]: https://github.com/rust-lang/rust/pull/43185
4454 [43228]: https://github.com/rust-lang/rust/pull/43228
4455 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4456 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4457 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4458 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4459 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4460 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4461 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4462 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4463 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4464 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4465 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4466 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4467 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4468 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4469 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4470 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4471 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4472 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4473 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4474 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4475 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4476 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4477 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4478 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4479 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4480 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4481 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4482 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4483 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4484 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4485 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4486 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4487 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4488 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4489 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4490 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4491 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4492 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4493 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4496 Version 1.19.0 (2017-07-20)
4497 ===========================
4502 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4503 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4504 - [Macro recursion limit increased to 1024 from 64.][41676]
4505 - [Added lint for detecting unused macros.][41907]
4506 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4507 For example: `let x = loop { break 7; };`
4508 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4509 contain `Copy` types and cannot have a `Drop` implementation.
4510 Example: `union Foo { bar: u8, baz: usize }`
4511 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4512 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4517 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4518 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4519 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4520 you should use `--target armv7-linux-androideabi`.
4521 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4522 - [Minor optimisation of string operations.][42037]
4523 - [Compiler error message is now `aborting due to previous error(s)` instead of
4524 `aborting due to N previous errors`][42150] This was previously inaccurate and
4525 would only count certain kinds of errors.
4526 - [The compiler now supports Visual Studio 2017][42225]
4527 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4528 - [Added a lot][42264] of [new error codes][42302]
4529 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4530 libraries with C Run-time Libraries(CRT) to be statically linked.
4531 - [Fixed various ARM codegen bugs][42740]
4536 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4537 `Extend<Cow<'a, str>>`][41449]
4538 - [`Vec` now implements `From<&mut [T]>`][41530]
4539 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4540 - [`SplitWhitespace` now implements `Clone`][41659]
4541 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4543 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4544 macros, but for printing to stderr.
4549 - [`OsString::shrink_to_fit`]
4552 - [`thread::ThreadId`]
4557 - [Build scripts can now add environment variables to the environment
4558 the crate is being compiled in.
4559 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4560 - [Subcommands now replace the current process rather than spawning a new
4561 child process][cargo/3970]
4562 - [Workspace members can now accept glob file patterns][cargo/3979]
4563 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4564 the members in a given workspace.][cargo/3988]
4565 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4566 - [Target directory path is now in the cargo metadata][cargo/4022]
4567 - [Cargo no longer checks out a local working directory for the
4568 crates.io index][cargo/4026] This should provide smaller file size for the
4569 registry, and improve cloning times, especially on Windows machines.
4570 - [Added an `--exclude` option for excluding certain packages when using the
4571 `--all` option][cargo/4031]
4572 - [Cargo will now automatically retry when receiving a 5xx error
4573 from crates.io][cargo/4032]
4574 - [The `--features` option now accepts multiple comma or space
4575 delimited values.][cargo/4084]
4576 - [Added support for custom target specific runners][cargo/3954]
4581 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4583 - [Rust will now release XZ compressed packages][rust-installer/57]
4584 - [rustup will now prefer to download rust packages with
4585 XZ compression][rustup/1100] over GZip packages.
4586 - [Added the ability to escape `#` in rust documentation][41785] By adding
4587 additional `#`'s ie. `##` is now `#`
4592 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4593 - [`-Z` flags are now no longer allowed to be used on the stable
4594 compiler.][41751] This has been a warning for a year previous to this.
4595 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4596 longer works][42844]. Users should migrate to the built-in `check`
4597 command, which has been available since 1.16.
4598 - [Ending a float literal with `._` is now a hard error.
4599 Example: `42._` .][41946]
4600 - [Any use of a private `extern crate` outside of its module is now a
4601 hard error.][36886] This was previously a warning.
4602 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4603 relative while the `::` prefix makes a path absolute, but was ignored and the
4604 path was relative regardless.
4605 - [Floating point constants in match patterns is now a hard error][36890]
4606 This was previously a warning.
4607 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4608 match patterns is now a hard error][36891] This was previously a warning.
4609 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4611 - [From the pound escape, lines consisting of multiple `#`s are
4613 - [It is an error to re-export private enum variants][42460]. This is
4614 known to break a number of crates that depend on an older version of
4616 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4617 to use it to find the linker, and the build will fail where it did
4618 not previously][42607]
4620 [36886]: https://github.com/rust-lang/rust/issues/36886
4621 [36888]: https://github.com/rust-lang/rust/issues/36888
4622 [36890]: https://github.com/rust-lang/rust/issues/36890
4623 [36891]: https://github.com/rust-lang/rust/issues/36891
4624 [36892]: https://github.com/rust-lang/rust/issues/36892
4625 [37406]: https://github.com/rust-lang/rust/issues/37406
4626 [39983]: https://github.com/rust-lang/rust/pull/39983
4627 [41145]: https://github.com/rust-lang/rust/pull/41145
4628 [41192]: https://github.com/rust-lang/rust/pull/41192
4629 [41258]: https://github.com/rust-lang/rust/pull/41258
4630 [41370]: https://github.com/rust-lang/rust/pull/41370
4631 [41449]: https://github.com/rust-lang/rust/pull/41449
4632 [41530]: https://github.com/rust-lang/rust/pull/41530
4633 [41624]: https://github.com/rust-lang/rust/pull/41624
4634 [41656]: https://github.com/rust-lang/rust/pull/41656
4635 [41659]: https://github.com/rust-lang/rust/pull/41659
4636 [41676]: https://github.com/rust-lang/rust/pull/41676
4637 [41751]: https://github.com/rust-lang/rust/pull/41751
4638 [41764]: https://github.com/rust-lang/rust/pull/41764
4639 [41785]: https://github.com/rust-lang/rust/pull/41785
4640 [41873]: https://github.com/rust-lang/rust/pull/41873
4641 [41907]: https://github.com/rust-lang/rust/pull/41907
4642 [41946]: https://github.com/rust-lang/rust/pull/41946
4643 [42016]: https://github.com/rust-lang/rust/pull/42016
4644 [42037]: https://github.com/rust-lang/rust/pull/42037
4645 [42068]: https://github.com/rust-lang/rust/pull/42068
4646 [42150]: https://github.com/rust-lang/rust/pull/42150
4647 [42162]: https://github.com/rust-lang/rust/pull/42162
4648 [42225]: https://github.com/rust-lang/rust/pull/42225
4649 [42264]: https://github.com/rust-lang/rust/pull/42264
4650 [42302]: https://github.com/rust-lang/rust/pull/42302
4651 [42460]: https://github.com/rust-lang/rust/issues/42460
4652 [42607]: https://github.com/rust-lang/rust/issues/42607
4653 [42740]: https://github.com/rust-lang/rust/pull/42740
4654 [42844]: https://github.com/rust-lang/rust/issues/42844
4655 [42948]: https://github.com/rust-lang/rust/pull/42948
4656 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4657 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4658 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4659 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4660 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4661 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4662 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4663 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4664 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4665 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4666 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4667 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4668 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4669 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4670 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4671 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4672 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4673 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4674 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4675 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4676 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4677 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4680 Version 1.18.0 (2017-06-08)
4681 ===========================
4686 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4687 make the item visible to just that module tree. Also accepts the keyword
4688 `crate` to make something public to the whole crate but not users of the
4689 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4690 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4691 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4692 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4693 types like `Write + Send`, trailing `+` are now supported in trait objects,
4694 and better error reporting for trait objects starting with `?Sized`.
4695 - [0e+10 is now a valid floating point literal][40589]
4696 - [Now warns if you bind a lifetime parameter to 'static][40734]
4697 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4698 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4699 representation in some cases.][40377]
4704 - [rustc can now emit mir with `--emit mir`][39891]
4705 - [Improved LLVM IR for trivial functions][40367]
4706 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4707 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4708 opportunities found through profiling
4709 - [Improved backtrace formatting when panicking][38165]
4714 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4715 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4716 iteration or reallocation.
4717 - [Simplified HashMap Bucket interface][40561] provides performance
4718 improvements for iterating and cloning.
4719 - [Specialize Vec::from_elem to use calloc][40409]
4720 - [Fixed Race condition in fs::create_dir_all][39799]
4721 - [No longer caching stdio on Windows][40516]
4722 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4723 2.50%~ faster and in one case now 12.50% faster.
4724 - [Optimized `AtomicBool::fetch_nand`][41143]
4729 - [`Child::try_wait`]
4730 - [`HashMap::retain`]
4731 - [`HashSet::retain`]
4733 - [`TcpStream::peek`]
4734 - [`UdpSocket::peek`]
4735 - [`UdpSocket::peek_from`]
4740 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4741 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4742 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4743 - [Added Android build support][cargo/3885]
4744 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4745 of a certain type, for example `cargo build --bins` will build all
4747 - [Added support for haiku][cargo/3952]
4752 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4753 - [Added rust-windbg script for better debugging on Windows][39983]
4754 - [Rust now uses the official cross compiler for NetBSD][40612]
4755 - [rustdoc now accepts `#` at the start of files][40828]
4756 - [Fixed jemalloc support for musl][41168]
4761 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4762 always placed after the sign if it exists and before the digits. With the `#`
4763 flag the zeroes are placed after the prefix and before the digits.
4764 - [Due to the struct field optimisation][40377], using `transmute` on structs
4765 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4766 always been undefined behavior, but is now more likely to break in practice.
4767 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4768 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4769 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4770 - [Overlapping inherent `impl`s are now a hard error][40728]
4771 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4772 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4773 `out.asm` and `out.ll` instead of only one of the filetypes.
4774 - [ calling a function that returns `Self` will no longer work][41805] when
4775 the size of `Self` cannot be statically determined.
4776 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4777 this has caused a few regressions namely:
4779 - Changed the link order of local static/dynamic libraries (respecting the
4780 order on given rather than having the compiler reorder).
4781 - Changed how MinGW is linked, native code linked to dynamic libraries
4782 may require manually linking to the gcc support library (for the native
4785 [38165]: https://github.com/rust-lang/rust/pull/38165
4786 [39799]: https://github.com/rust-lang/rust/pull/39799
4787 [39891]: https://github.com/rust-lang/rust/pull/39891
4788 [39983]: https://github.com/rust-lang/rust/pull/39983
4789 [40043]: https://github.com/rust-lang/rust/pull/40043
4790 [40241]: https://github.com/rust-lang/rust/pull/40241
4791 [40338]: https://github.com/rust-lang/rust/pull/40338
4792 [40367]: https://github.com/rust-lang/rust/pull/40367
4793 [40377]: https://github.com/rust-lang/rust/pull/40377
4794 [40409]: https://github.com/rust-lang/rust/pull/40409
4795 [40516]: https://github.com/rust-lang/rust/pull/40516
4796 [40556]: https://github.com/rust-lang/rust/pull/40556
4797 [40561]: https://github.com/rust-lang/rust/pull/40561
4798 [40589]: https://github.com/rust-lang/rust/pull/40589
4799 [40612]: https://github.com/rust-lang/rust/pull/40612
4800 [40723]: https://github.com/rust-lang/rust/pull/40723
4801 [40728]: https://github.com/rust-lang/rust/pull/40728
4802 [40731]: https://github.com/rust-lang/rust/pull/40731
4803 [40734]: https://github.com/rust-lang/rust/pull/40734
4804 [40805]: https://github.com/rust-lang/rust/pull/40805
4805 [40807]: https://github.com/rust-lang/rust/pull/40807
4806 [40828]: https://github.com/rust-lang/rust/pull/40828
4807 [40870]: https://github.com/rust-lang/rust/pull/40870
4808 [41085]: https://github.com/rust-lang/rust/pull/41085
4809 [41143]: https://github.com/rust-lang/rust/pull/41143
4810 [41168]: https://github.com/rust-lang/rust/pull/41168
4811 [41270]: https://github.com/rust-lang/rust/issues/41270
4812 [41469]: https://github.com/rust-lang/rust/pull/41469
4813 [41805]: https://github.com/rust-lang/rust/issues/41805
4814 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4815 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4816 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4817 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4818 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4819 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4820 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4821 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4822 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4823 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4824 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4825 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4826 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4827 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4830 Version 1.17.0 (2017-04-27)
4831 ===========================
4836 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4837 * [Fields of structs may be initialized without duplicating the field/variable
4838 names][39761]. [RFC 1682]
4839 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4840 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4841 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4842 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4843 `'b`. Soundness fix.
4844 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4845 * [Static variables may contain references to other statics][40027]
4850 * [Exit quickly on only `--emit dep-info`][40336]
4851 * [Make `-C relocation-model` more correctly determine whether the linker
4852 creates a position-independent executable][40245]
4853 * [Add `-C overflow-checks` to directly control whether integer overflow
4855 * [The rustc type checker now checks items on demand instead of in a single
4856 in-order pass][40008]. This is mostly an internal refactoring in support of
4857 future work, including incremental type checking, but also resolves [RFC
4858 1647], allowing `Self` to appear in `impl` `where` clauses.
4859 * [Optimize vtable loads][39995]
4860 * [Turn off vectorization for Emscripten targets][39990]
4861 * [Provide suggestions for unknown macros imported with `use`][39953]
4862 * [Fix ICEs in path resolution][39939]
4863 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4864 * [Add clearer error message using `&str + &str`][39116]
4875 * [`Ordering::then`]
4876 * [`Ordering::then_with`]
4877 * [`BTreeMap::range`]
4878 * [`BTreeMap::range_mut`]
4879 * [`collections::Bound`]
4880 * [`process::abort`]
4881 * [`ptr::read_unaligned`]
4882 * [`ptr::write_unaligned`]
4883 * [`Result::expect_err`]
4886 * [`Cell::into_inner`]
4892 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4893 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4894 * [`String` implements `FromIterator<&char>`][40028]
4895 * `Box` [implements][40009] a number of new conversions:
4896 `From<Box<str>> for String`,
4897 `From<Box<[T]>> for Vec<T>`,
4898 `From<Box<CStr>> for CString`,
4899 `From<Box<OsStr>> for OsString`,
4900 `From<Box<Path>> for PathBuf`,
4901 `Into<Box<str>> for String`,
4902 `Into<Box<[T]>> for Vec<T>`,
4903 `Into<Box<CStr>> for CString`,
4904 `Into<Box<OsStr>> for OsString`,
4905 `Into<Box<Path>> for PathBuf`,
4906 `Default for Box<str>`,
4907 `Default for Box<CStr>`,
4908 `Default for Box<OsStr>`,
4909 `From<&CStr> for Box<CStr>`,
4910 `From<&OsStr> for Box<OsStr>`,
4911 `From<&Path> for Box<Path>`
4912 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4913 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4914 * [Slightly optimize `slice::sort`][39538]
4915 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4916 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4917 `Box<str>` implements `From<&str>`][39438]
4918 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4919 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4920 * [`format!` estimates the needed capacity before writing a string][39356]
4921 * [Support unprivileged symlink creation in Windows][38921]
4922 * [`PathBuf` implements `Default`][38764]
4923 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4924 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4925 and poor hash functions.
4930 * [Add `cargo check --all`][cargo/3731]
4931 * [Add an option to ignore SSL revocation checking][cargo/3699]
4932 * [Add `cargo run --package`][cargo/3691]
4933 * [Add `required_features`][cargo/3667]
4934 * [Assume `build.rs` is a build script][cargo/3664]
4935 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4940 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4942 * [The "Unstable Book" documents nightly-only features][ubook]
4943 * [Improve the style of the sidebar in rustdoc output][40265]
4944 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4945 * [Fix MSP430 breakage due to `i128`][40257]
4946 * [Preliminary Solaris/SPARCv9 support][39903]
4947 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4948 run without installing the MSVC runtime.
4949 * [`rustdoc --test` includes file names in test names][39788]
4950 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4951 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4952 * [Initial support for `aarch64-unknown-freebsd`][39491]
4953 * [Initial support for `i686-unknown-netbsd`][39426]
4954 * [This release no longer includes the old makefile build system][39431]. Rust
4955 is built with a custom build system, written in Rust, and with Cargo.
4956 * [Add Debug implementations for libcollection structs][39002]
4957 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4958 * [`--test-threads=0` produces an error][38945]
4959 * [`rustup` installs documentation by default][40526]
4960 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4961 WinDbg and Visual Studio to improve the debugging experience.
4966 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4967 workaround, either use MSVC 2015 or run vcvars.bat.
4968 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4969 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4970 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4972 * [`format!` and `Display::to_string` panic if an underlying formatting
4973 implementation returns an error][40117]. Previously the error was silently
4974 ignored. It is incorrect for `write_fmt` to return an error when writing
4976 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4977 crates were marked stable and could be accessed from the stable toolchain.
4978 * [Rust git source no longer includes vendored crates][39728]. Those that need
4979 to build with vendored crates should build from release tarballs.
4980 * [Fix inert attributes from `proc_macro_derives`][39572]
4981 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4982 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4984 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4985 existing code generally ignores the type of dead-code unless a type-hint is
4986 provided; this can cause surprising inference interactions particularly around
4987 defaulting. The new code uniformly ignores the result type of dead-code.
4988 * [Tuple-struct constructors with private fields are no longer visible][38932]
4989 * [Lifetime parameters that do not appear in the arguments are now considered
4990 early-bound][38897], resolving a soundness bug (#[32330]). The
4991 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4993 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4994 * [Make transmuting from fn item types to pointer-sized types a hard
4997 [27787]: https://github.com/rust-lang/rust/issues/27787
4998 [32330]: https://github.com/rust-lang/rust/issues/32330
4999 [34198]: https://github.com/rust-lang/rust/pull/34198
5000 [38161]: https://github.com/rust-lang/rust/pull/38161
5001 [38368]: https://github.com/rust-lang/rust/pull/38368
5002 [38584]: https://github.com/rust-lang/rust/issues/38584
5003 [38661]: https://github.com/rust-lang/rust/pull/38661
5004 [38764]: https://github.com/rust-lang/rust/pull/38764
5005 [38864]: https://github.com/rust-lang/rust/issues/38864
5006 [38897]: https://github.com/rust-lang/rust/pull/38897
5007 [38921]: https://github.com/rust-lang/rust/pull/38921
5008 [38932]: https://github.com/rust-lang/rust/pull/38932
5009 [38945]: https://github.com/rust-lang/rust/pull/38945
5010 [38981]: https://github.com/rust-lang/rust/pull/38981
5011 [39002]: https://github.com/rust-lang/rust/pull/39002
5012 [39116]: https://github.com/rust-lang/rust/pull/39116
5013 [39193]: https://github.com/rust-lang/rust/pull/39193
5014 [39265]: https://github.com/rust-lang/rust/pull/39265
5015 [39356]: https://github.com/rust-lang/rust/pull/39356
5016 [39372]: https://github.com/rust-lang/rust/pull/39372
5017 [39426]: https://github.com/rust-lang/rust/pull/39426
5018 [39431]: https://github.com/rust-lang/rust/pull/39431
5019 [39438]: https://github.com/rust-lang/rust/pull/39438
5020 [39440]: https://github.com/rust-lang/rust/pull/39440
5021 [39485]: https://github.com/rust-lang/rust/pull/39485
5022 [39491]: https://github.com/rust-lang/rust/pull/39491
5023 [39518]: https://github.com/rust-lang/rust/pull/39518
5024 [39538]: https://github.com/rust-lang/rust/pull/39538
5025 [39572]: https://github.com/rust-lang/rust/pull/39572
5026 [39633]: https://github.com/rust-lang/rust/pull/39633
5027 [39642]: https://github.com/rust-lang/rust/pull/39642
5028 [39728]: https://github.com/rust-lang/rust/pull/39728
5029 [39761]: https://github.com/rust-lang/rust/pull/39761
5030 [39788]: https://github.com/rust-lang/rust/pull/39788
5031 [39793]: https://github.com/rust-lang/rust/pull/39793
5032 [39837]: https://github.com/rust-lang/rust/pull/39837
5033 [39843]: https://github.com/rust-lang/rust/pull/39843
5034 [39851]: https://github.com/rust-lang/rust/pull/39851
5035 [39903]: https://github.com/rust-lang/rust/pull/39903
5036 [39939]: https://github.com/rust-lang/rust/pull/39939
5037 [39953]: https://github.com/rust-lang/rust/pull/39953
5038 [39960]: https://github.com/rust-lang/rust/pull/39960
5039 [39990]: https://github.com/rust-lang/rust/pull/39990
5040 [39995]: https://github.com/rust-lang/rust/pull/39995
5041 [40008]: https://github.com/rust-lang/rust/pull/40008
5042 [40009]: https://github.com/rust-lang/rust/pull/40009
5043 [40027]: https://github.com/rust-lang/rust/pull/40027
5044 [40028]: https://github.com/rust-lang/rust/pull/40028
5045 [40037]: https://github.com/rust-lang/rust/pull/40037
5046 [40117]: https://github.com/rust-lang/rust/pull/40117
5047 [40166]: https://github.com/rust-lang/rust/pull/40166
5048 [40245]: https://github.com/rust-lang/rust/pull/40245
5049 [40257]: https://github.com/rust-lang/rust/pull/40257
5050 [40261]: https://github.com/rust-lang/rust/pull/40261
5051 [40265]: https://github.com/rust-lang/rust/pull/40265
5052 [40319]: https://github.com/rust-lang/rust/pull/40319
5053 [40336]: https://github.com/rust-lang/rust/pull/40336
5054 [40526]: https://github.com/rust-lang/rust/pull/40526
5055 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5056 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5057 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5058 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5059 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5060 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5061 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5062 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5063 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5064 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5065 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5066 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5067 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5068 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5069 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5070 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5071 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5072 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5073 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5074 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5075 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5076 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5077 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5078 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5079 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5080 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5081 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5082 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5083 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5084 [mdbook]: https://crates.io/crates/mdbook
5085 [ubook]: https://doc.rust-lang.org/unstable-book/
5088 Version 1.16.0 (2017-03-16)
5089 ===========================
5094 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5095 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5096 match patterns][38069]
5097 * [Clean up semantics of `self` in an import list][38313]
5098 * [`Self` may appear in `impl` headers][38920]
5099 * [`Self` may appear in struct expressions][39282]
5104 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5105 a `.rmeta` file containing only crate metadata][38571]. This can be
5106 used by tools like the Rust Language Service to perform
5107 metadata-only builds.
5108 * [Levenshtein based typo suggestions now work in most places, while
5109 previously they worked only for fields and sometimes for local
5110 variables][38927]. Together with the overhaul of "no
5111 resolution"/"unexpected resolution" errors (#[38154]) they result in
5112 large and systematic improvement in resolution diagnostics.
5113 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5115 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5116 * [`rustc` no longer attempts to provide "consider using an explicit
5117 lifetime" suggestions][37057]. They were inaccurate.
5122 * [`VecDeque::truncate`]
5123 * [`VecDeque::resize`]
5124 * [`String::insert_str`]
5125 * [`Duration::checked_add`]
5126 * [`Duration::checked_sub`]
5127 * [`Duration::checked_div`]
5128 * [`Duration::checked_mul`]
5131 * [`SocketAddr::is_ipv4`]
5132 * [`SocketAddr::is_ipv6`]
5133 * [`IpAddr::is_ipv4`]
5134 * [`IpAddr::is_ipv6`]
5136 * [`Vec::dedup_by_key`]
5137 * [`Result::unwrap_or_default`]
5138 * [`<*const T>::wrapping_offset`]
5139 * [`<*mut T>::wrapping_offset`]
5140 * `CommandExt::creation_flags`
5141 * [`File::set_permissions`]
5142 * [`String::split_off`]
5147 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5148 their argument by `Borrow` parameter][37761]
5149 * [All public types in std implement `Debug`][38006]
5150 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5151 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5152 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5154 * [std: Fix partial writes in `LineWriter`][38062]
5155 * [std: Clamp max read/write sizes on Unix][38062]
5156 * [Use more specific panic message for `&str` slicing errors][38066]
5157 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5158 functionality cannot be achieved in std currently.
5159 * [`writeln!`, like `println!`, now accepts a form with no string
5160 or formatting arguments, to just print a newline][38469]
5161 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5162 * [Reduce the size of static data in `std_unicode::tables`][38781]
5163 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5164 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5166 * [`Duration` implements `Sum`][38712]
5167 * [`String` implements `ToSocketAddrs`][39048]
5172 * [The `cargo check` command does a type check of a project without
5173 building it][cargo/3296]
5174 * [crates.io will display CI badges from Travis and AppVeyor, if
5175 specified in Cargo.toml][cargo/3546]
5176 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5177 * [Compilation profiles accept integer values for `debug`, in addition
5178 to `true` and `false`. These are passed to `rustc` as the value to
5179 `-C debuginfo`][cargo/3534]
5180 * [Implement `cargo --version --verbose`][cargo/3604]
5181 * [All builds now output 'dep-info' build dependencies compatible with
5182 make and ninja][cargo/3557]
5183 * [Build all workspace members with `build --all`][cargo/3511]
5184 * [Document all workspace members with `doc --all`][cargo/3515]
5185 * [Path deps outside workspace are not members][cargo/3443]
5190 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5191 the path to the Rust implementation][38589]
5192 * [The `armv7-linux-androideabi` target no longer enables NEON
5193 extensions, per Google's ABI guide][38413]
5194 * [The stock standard library can be compiled for Redox OS][38401]
5195 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5197 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5199 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5204 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5205 match patterns][38069]
5206 * In this release, references to uninhabited types can not be
5207 pattern-matched. This was accidentally allowed in 1.15.
5208 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5209 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5211 * [Clean up semantics of `self` in an import list][38313]
5212 * Reimplemented lifetime elision. This change was almost entirely compatible
5213 with existing code, but it did close a number of small bugs and loopholes,
5214 as well as being more accepting in some other [cases][41105].
5216 [37057]: https://github.com/rust-lang/rust/pull/37057
5217 [37761]: https://github.com/rust-lang/rust/pull/37761
5218 [38006]: https://github.com/rust-lang/rust/pull/38006
5219 [38051]: https://github.com/rust-lang/rust/pull/38051
5220 [38062]: https://github.com/rust-lang/rust/pull/38062
5221 [38062]: https://github.com/rust-lang/rust/pull/38622
5222 [38066]: https://github.com/rust-lang/rust/pull/38066
5223 [38069]: https://github.com/rust-lang/rust/pull/38069
5224 [38131]: https://github.com/rust-lang/rust/pull/38131
5225 [38154]: https://github.com/rust-lang/rust/pull/38154
5226 [38274]: https://github.com/rust-lang/rust/pull/38274
5227 [38304]: https://github.com/rust-lang/rust/pull/38304
5228 [38313]: https://github.com/rust-lang/rust/pull/38313
5229 [38314]: https://github.com/rust-lang/rust/pull/38314
5230 [38327]: https://github.com/rust-lang/rust/pull/38327
5231 [38401]: https://github.com/rust-lang/rust/pull/38401
5232 [38413]: https://github.com/rust-lang/rust/pull/38413
5233 [38469]: https://github.com/rust-lang/rust/pull/38469
5234 [38559]: https://github.com/rust-lang/rust/pull/38559
5235 [38571]: https://github.com/rust-lang/rust/pull/38571
5236 [38580]: https://github.com/rust-lang/rust/pull/38580
5237 [38589]: https://github.com/rust-lang/rust/pull/38589
5238 [38670]: https://github.com/rust-lang/rust/pull/38670
5239 [38712]: https://github.com/rust-lang/rust/pull/38712
5240 [38726]: https://github.com/rust-lang/rust/pull/38726
5241 [38781]: https://github.com/rust-lang/rust/pull/38781
5242 [38798]: https://github.com/rust-lang/rust/pull/38798
5243 [38909]: https://github.com/rust-lang/rust/pull/38909
5244 [38920]: https://github.com/rust-lang/rust/pull/38920
5245 [38927]: https://github.com/rust-lang/rust/pull/38927
5246 [39048]: https://github.com/rust-lang/rust/pull/39048
5247 [39282]: https://github.com/rust-lang/rust/pull/39282
5248 [39379]: https://github.com/rust-lang/rust/pull/39379
5249 [41105]: https://github.com/rust-lang/rust/issues/41105
5250 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5251 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5252 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5253 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5254 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5255 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5256 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5257 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5258 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5259 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5260 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5261 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5262 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5263 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5264 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5265 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5266 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5267 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5268 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5269 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5270 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5271 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5272 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5273 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5274 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5275 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5276 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5277 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5278 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5279 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5282 Version 1.15.1 (2017-02-09)
5283 ===========================
5285 * [Fix IntoIter::as_mut_slice's signature][39466]
5286 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5288 [39466]: https://github.com/rust-lang/rust/pull/39466
5289 [39523]: https://github.com/rust-lang/rust/pull/39523
5292 Version 1.15.0 (2017-02-02)
5293 ===========================
5298 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5299 stable. This allows popular code-generating crates like Serde and Diesel to
5300 work ergonomically. [RFC 1681].
5301 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5302 with curly braces][36868]. Part of [RFC 1506].
5303 * [A number of minor changes to name resolution have been activated][37127].
5304 They add up to more consistent semantics, allowing for future evolution of
5305 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5306 details of what is different. The breaking changes here have been transitioned
5307 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5308 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5310 * [`?Sized` can be used in `where` clauses][37791]
5311 * [There is now a limit on the size of monomorphized types and it can be
5312 modified with the `#![type_size_limit]` crate attribute, similarly to
5313 the `#![recursion_limit]` attribute][37789]
5318 * [On Windows, the compiler will apply dllimport attributes when linking to
5319 extern functions][37973]. Additional attributes and flags can control which
5320 library kind is linked and its name. [RFC 1717].
5321 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5322 * [The `--test` flag works with procedural macro crates][38107]
5323 * [Fix `extern "aapcs" fn` ABI][37814]
5324 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5325 * [The `format!` expander recognizes incorrect `printf` and shell-style
5326 formatting directives and suggests the correct format][37613].
5327 * [Only report one error for all unused imports in an import list][37456]
5329 Compiler Performance
5330 --------------------
5332 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5333 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5334 * [Don't clone in `UnificationTable::probe`][37848]
5335 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5336 * [Use small vectors in type walker][37760]
5337 * [Macro expansion performance was improved][37701]
5338 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5339 * [Replace FNV with a faster hash function][37229]
5344 * [`std::iter::Iterator::min_by`]
5345 * [`std::iter::Iterator::max_by`]
5346 * [`std::os::*::fs::FileExt`]
5347 * [`std::sync::atomic::Atomic*::get_mut`]
5348 * [`std::sync::atomic::Atomic*::into_inner`]
5349 * [`std::vec::IntoIter::as_slice`]
5350 * [`std::vec::IntoIter::as_mut_slice`]
5351 * [`std::sync::mpsc::Receiver::try_iter`]
5352 * [`std::os::unix::process::CommandExt::before_exec`]
5353 * [`std::rc::Rc::strong_count`]
5354 * [`std::rc::Rc::weak_count`]
5355 * [`std::sync::Arc::strong_count`]
5356 * [`std::sync::Arc::weak_count`]
5357 * [`std::char::encode_utf8`]
5358 * [`std::char::encode_utf16`]
5359 * [`std::cell::Ref::clone`]
5360 * [`std::io::Take::into_inner`]
5365 * [The standard sorting algorithm has been rewritten for dramatic performance
5366 improvements][38192]. It is a hybrid merge sort, drawing influences from
5367 Timsort. Previously it was a naive merge sort.
5368 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5369 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5371 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5372 and `char_indices().last()`][37882]
5373 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5374 * [Chinese characters display correctly in `fmt::Debug`][37855]
5375 * [Derive `Default` for `Duration`][37699]
5376 * [Support creation of anonymous pipes on WinXP/2k][37677]
5377 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5378 * [Don't pass overlapped handles to processes][38835]
5383 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5384 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5385 should instead check the variable at runtime with `std::env`. That the value
5386 was set at build time was a bug, and incorrect when cross-compiling. This
5387 change is known to cause breakage.
5388 * [Add `--all` flag to `cargo test`][cargo/3221]
5389 * [Compile statically against the MSVC CRT][cargo/3363]
5390 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5391 * [Link OpenSSL statically on OSX][cargo/3311]
5392 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5393 * [Test for bad path overrides with summaries][cargo/3336]
5394 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5395 * [Fix retrying crate downloads for network errors][cargo/3348]
5396 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5397 * [Emit more info on --message-format=json][cargo/3319]
5398 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5399 * [Don't ignore errors in workspace manifest][cargo/3409]
5400 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5405 * [Test runners (binaries built with `--test`) now support a `--list` argument
5406 that lists the tests it contains][38185]
5407 * [Test runners now support a `--exact` argument that makes the test filter
5408 match exactly, instead of matching only a substring of the test name][38181]
5409 * [rustdoc supports a `--playground-url` flag][37763]
5410 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5415 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5416 continue to be used in this release by passing `--disable-rustbuild` to the
5417 configure script, but they will be deleted soon. Note that the new build
5418 system uses a different on-disk layout that will likely affect any scripts
5420 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5422 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5423 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5429 * [A number of minor changes to name resolution have been activated][37127].
5430 They add up to more consistent semantics, allowing for future evolution of
5431 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5432 details of what is different. The breaking changes here have been transitioned
5433 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5434 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5435 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5436 should instead check the variable at runtime with `std::env`. That the value
5437 was set at build time was a bug, and incorrect when cross-compiling. This
5438 change is known to cause breakage.
5439 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5440 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5441 1.10 and is now an error by default. It will become a hard error in the near
5443 * [The semantics relating modules to file system directories are changing in
5444 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5445 lint, which is a warning in this release, and will become a hard error in the
5447 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5448 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5449 the underlying iterator][37834]
5451 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5452 [33685]: https://github.com/rust-lang/rust/issues/33685
5453 [36868]: https://github.com/rust-lang/rust/pull/36868
5454 [37127]: https://github.com/rust-lang/rust/pull/37127
5455 [37229]: https://github.com/rust-lang/rust/pull/37229
5456 [37456]: https://github.com/rust-lang/rust/pull/37456
5457 [37527]: https://github.com/rust-lang/rust/pull/37527
5458 [37602]: https://github.com/rust-lang/rust/pull/37602
5459 [37613]: https://github.com/rust-lang/rust/pull/37613
5460 [37615]: https://github.com/rust-lang/rust/pull/37615
5461 [37636]: https://github.com/rust-lang/rust/pull/37636
5462 [37627]: https://github.com/rust-lang/rust/pull/37627
5463 [37642]: https://github.com/rust-lang/rust/pull/37642
5464 [37677]: https://github.com/rust-lang/rust/pull/37677
5465 [37699]: https://github.com/rust-lang/rust/pull/37699
5466 [37701]: https://github.com/rust-lang/rust/pull/37701
5467 [37705]: https://github.com/rust-lang/rust/pull/37705
5468 [37749]: https://github.com/rust-lang/rust/pull/37749
5469 [37760]: https://github.com/rust-lang/rust/pull/37760
5470 [37763]: https://github.com/rust-lang/rust/pull/37763
5471 [37764]: https://github.com/rust-lang/rust/pull/37764
5472 [37789]: https://github.com/rust-lang/rust/pull/37789
5473 [37791]: https://github.com/rust-lang/rust/pull/37791
5474 [37814]: https://github.com/rust-lang/rust/pull/37814
5475 [37817]: https://github.com/rust-lang/rust/pull/37817
5476 [37834]: https://github.com/rust-lang/rust/pull/37834
5477 [37848]: https://github.com/rust-lang/rust/pull/37848
5478 [37855]: https://github.com/rust-lang/rust/pull/37855
5479 [37882]: https://github.com/rust-lang/rust/pull/37882
5480 [37888]: https://github.com/rust-lang/rust/pull/37888
5481 [37973]: https://github.com/rust-lang/rust/pull/37973
5482 [37979]: https://github.com/rust-lang/rust/pull/37979
5483 [38086]: https://github.com/rust-lang/rust/pull/38086
5484 [38107]: https://github.com/rust-lang/rust/pull/38107
5485 [38117]: https://github.com/rust-lang/rust/pull/38117
5486 [38134]: https://github.com/rust-lang/rust/pull/38134
5487 [38146]: https://github.com/rust-lang/rust/pull/38146
5488 [38181]: https://github.com/rust-lang/rust/pull/38181
5489 [38182]: https://github.com/rust-lang/rust/pull/38182
5490 [38185]: https://github.com/rust-lang/rust/pull/38185
5491 [38192]: https://github.com/rust-lang/rust/pull/38192
5492 [38279]: https://github.com/rust-lang/rust/pull/38279
5493 [38835]: https://github.com/rust-lang/rust/pull/38835
5494 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5495 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5496 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5497 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5498 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5499 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5500 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5501 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5502 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5503 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5504 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5505 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5506 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5507 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5508 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5509 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5510 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5511 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5512 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5513 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5514 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5515 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5516 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5517 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5518 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5519 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5520 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5521 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5522 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5523 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5524 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5525 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5526 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5527 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5528 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5529 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5530 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5531 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5534 Version 1.14.0 (2016-12-22)
5535 ===========================
5540 * [`..` matches multiple tuple fields in enum variants, structs
5541 and tuples][36843]. [RFC 1492].
5542 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5543 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5544 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5545 dereferencing][36822]
5550 * [Mark enums with non-zero discriminant as non-zero][37224]
5551 * [Lower-case `static mut` names are linted like other
5552 statics and consts][37162]
5553 * [Fix ICE on some macros in const integer positions
5554 (e.g. `[u8; m!()]`)][36819]
5555 * [Improve error message and snippet for "did you mean `x`"][36798]
5556 * [Add a panic-strategy field to the target specification][36794]
5557 * [Include LLVM version in `--version --verbose`][37200]
5559 Compile-time Optimizations
5560 --------------------------
5562 * [Improve macro expansion performance][37569]
5563 * [Shrink `Expr_::ExprInlineAsm`][37445]
5564 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5565 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5566 * [Avoid more allocations when compiling html5ever][37373]
5567 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5568 * [Avoid some allocations in the macro parser][37318]
5569 * [Use a faster deflate setting][37298]
5570 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5571 during interning of slices][37270]
5572 * [Optimize `write_metadata`][37267]
5573 * [Don't process obligation forest cycles when stalled][37231]
5574 * [Avoid many `CrateConfig` clones][37161]
5575 * [Optimize `Substs::super_fold_with`][37108]
5576 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5577 * [Speed up `plug_leaks`][36917]
5582 * [`println!()`, with no arguments, prints newline][36825].
5583 Previously, an empty string was required to achieve the same.
5584 * [`Wrapping` impls standard binary and unary operators, as well as
5585 the `Sum` and `Product` iterators][37356]
5586 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5588 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5589 `VecDeque` iterators][37315]
5590 * [Improve `SipHasher` performance on small values][37312]
5591 * [Add Iterator trait TrustedLen to enable better FromIterator /
5593 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5594 * [`ReadDir` implements `Debug`][37221]
5595 * [Implement `RefUnwindSafe` for atomic types][37178]
5596 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5597 * [Avoid allocations in `Decoder::read_str`][37064]
5598 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5599 * [Impl `Debug` for raw pointers to unsized data][36880]
5600 * [Don't reuse `HashMap` random seeds][37470]
5601 * [The internal memory layout of `HashMap` is more cache-friendly, for
5602 significant improvements in some operations][36692]
5603 * [`HashMap` uses less memory on 32-bit architectures][36595]
5604 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5609 * [Expose rustc cfg values to build scripts][cargo/3243]
5610 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5611 * [Fix passing --features when testing multiple packages][cargo/3280]
5612 * [Use a single profile set per workspace][cargo/3249]
5613 * [Load `replace` sections from lock files][cargo/3220]
5614 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5619 * [rustup is the recommended Rust installation method][1.14rustup]
5620 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5621 S390x. These are [tier 2] platforms and may have major defects. Follow the
5622 instructions on the website to install, or add the targets to an existing
5623 installation with `rustup target add`. The new target triples are:
5624 - `mips-unknown-linux-gnu`
5625 - `mipsel-unknown-linux-gnu`
5626 - `mips64-unknown-linux-gnuabi64`
5627 - `mips64el-unknown-linux-gnuabi64 `
5628 - `powerpc-unknown-linux-gnu`
5629 - `powerpc64-unknown-linux-gnu`
5630 - `powerpc64le-unknown-linux-gnu`
5631 - `s390x-unknown-linux-gnu `
5632 * This release includes target (std) builds for ARM Linux running MUSL
5633 libc. These are [tier 2] platforms and may have major defects. Add the
5634 following triples to an existing rustup installation with `rustup target add`:
5635 - `arm-unknown-linux-musleabi`
5636 - `arm-unknown-linux-musleabihf`
5637 - `armv7-unknown-linux-musleabihf`
5638 * This release includes [experimental support for WebAssembly][1.14wasm], via
5639 the `wasm32-unknown-emscripten` target. This target is known to have major
5640 defects. Please test, report, and fix.
5641 * rustup no longer installs documentation by default. Run `rustup
5642 component add rust-docs` to install.
5643 * [Fix line stepping in debugger][37310]
5644 * [Enable line number debuginfo in releases][37280]
5649 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5650 * [Add support for Fuchsia OS][37313]
5651 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5656 * [A number of forward-compatibility lints used by the compiler
5657 to gradually introduce language changes have been converted
5658 to deny by default][36894]:
5659 - ["use of inaccessible extern crate erroneously allowed"][36886]
5660 - ["type parameter default erroneously allowed in invalid location"][36887]
5661 - ["detects super or self keywords at the beginning of global path"][36888]
5662 - ["two overlapping inherent impls define an item with the same name
5663 were erroneously allowed"][36889]
5664 - ["floating-point constants cannot be used in patterns"][36890]
5665 - ["constants of struct or enum type can only be used in a pattern if
5666 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5667 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5668 * [Prohibit patterns in trait methods without bodies][37378]
5669 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5670 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5671 * [The `$crate` macro variable is accepted in fewer locations][37213]
5672 * [Impls specifying extra region requirements beyond the trait
5673 they implement are rejected][37167]
5674 * [Enums may not be unsized][37111]. Unsized enums are intended to
5675 work but never have. For now they are forbidden.
5676 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5678 [tier 2]: https://forge.rust-lang.org/platform-support.html
5679 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5680 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5681 [36430]: https://github.com/rust-lang/rust/pull/36430
5682 [36595]: https://github.com/rust-lang/rust/pull/36595
5683 [36595]: https://github.com/rust-lang/rust/pull/36595
5684 [36692]: https://github.com/rust-lang/rust/pull/36692
5685 [36767]: https://github.com/rust-lang/rust/pull/36767
5686 [36794]: https://github.com/rust-lang/rust/pull/36794
5687 [36798]: https://github.com/rust-lang/rust/pull/36798
5688 [36819]: https://github.com/rust-lang/rust/pull/36819
5689 [36822]: https://github.com/rust-lang/rust/pull/36822
5690 [36825]: https://github.com/rust-lang/rust/pull/36825
5691 [36843]: https://github.com/rust-lang/rust/pull/36843
5692 [36880]: https://github.com/rust-lang/rust/pull/36880
5693 [36886]: https://github.com/rust-lang/rust/issues/36886
5694 [36887]: https://github.com/rust-lang/rust/issues/36887
5695 [36888]: https://github.com/rust-lang/rust/issues/36888
5696 [36889]: https://github.com/rust-lang/rust/issues/36889
5697 [36890]: https://github.com/rust-lang/rust/issues/36890
5698 [36891]: https://github.com/rust-lang/rust/issues/36891
5699 [36892]: https://github.com/rust-lang/rust/issues/36892
5700 [36894]: https://github.com/rust-lang/rust/pull/36894
5701 [36917]: https://github.com/rust-lang/rust/pull/36917
5702 [36993]: https://github.com/rust-lang/rust/pull/36993
5703 [37037]: https://github.com/rust-lang/rust/pull/37037
5704 [37064]: https://github.com/rust-lang/rust/pull/37064
5705 [37094]: https://github.com/rust-lang/rust/pull/37094
5706 [37108]: https://github.com/rust-lang/rust/pull/37108
5707 [37111]: https://github.com/rust-lang/rust/pull/37111
5708 [37161]: https://github.com/rust-lang/rust/pull/37161
5709 [37162]: https://github.com/rust-lang/rust/pull/37162
5710 [37167]: https://github.com/rust-lang/rust/pull/37167
5711 [37178]: https://github.com/rust-lang/rust/pull/37178
5712 [37200]: https://github.com/rust-lang/rust/pull/37200
5713 [37213]: https://github.com/rust-lang/rust/pull/37213
5714 [37221]: https://github.com/rust-lang/rust/pull/37221
5715 [37224]: https://github.com/rust-lang/rust/pull/37224
5716 [37230]: https://github.com/rust-lang/rust/pull/37230
5717 [37231]: https://github.com/rust-lang/rust/pull/37231
5718 [37247]: https://github.com/rust-lang/rust/pull/37247
5719 [37267]: https://github.com/rust-lang/rust/pull/37267
5720 [37270]: https://github.com/rust-lang/rust/pull/37270
5721 [37273]: https://github.com/rust-lang/rust/pull/37273
5722 [37280]: https://github.com/rust-lang/rust/pull/37280
5723 [37298]: https://github.com/rust-lang/rust/pull/37298
5724 [37306]: https://github.com/rust-lang/rust/pull/37306
5725 [37310]: https://github.com/rust-lang/rust/pull/37310
5726 [37312]: https://github.com/rust-lang/rust/pull/37312
5727 [37313]: https://github.com/rust-lang/rust/pull/37313
5728 [37315]: https://github.com/rust-lang/rust/pull/37315
5729 [37318]: https://github.com/rust-lang/rust/pull/37318
5730 [37322]: https://github.com/rust-lang/rust/pull/37322
5731 [37326]: https://github.com/rust-lang/rust/pull/37326
5732 [37351]: https://github.com/rust-lang/rust/pull/37351
5733 [37356]: https://github.com/rust-lang/rust/pull/37356
5734 [37367]: https://github.com/rust-lang/rust/pull/37367
5735 [37373]: https://github.com/rust-lang/rust/pull/37373
5736 [37378]: https://github.com/rust-lang/rust/pull/37378
5737 [37389]: https://github.com/rust-lang/rust/pull/37389
5738 [37392]: https://github.com/rust-lang/rust/pull/37392
5739 [37427]: https://github.com/rust-lang/rust/pull/37427
5740 [37439]: https://github.com/rust-lang/rust/pull/37439
5741 [37445]: https://github.com/rust-lang/rust/pull/37445
5742 [37470]: https://github.com/rust-lang/rust/pull/37470
5743 [37569]: https://github.com/rust-lang/rust/pull/37569
5744 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5745 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5746 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5747 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5748 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5749 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5750 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5753 Version 1.13.0 (2016-11-10)
5754 ===========================
5759 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5760 errors, like the `try!` macro, described in [RFC 0243].
5761 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5762 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5763 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5764 * [Fix lifetime rules for 'if' conditions][36029]
5765 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5770 * [Add the `-C link-arg` argument][36574]
5771 * [Remove the old AST-based backend from rustc_trans][35764]
5772 * [Don't enable NEON by default on armv7 Linux][35814]
5773 * [Fix debug line number info for macro expansions][35238]
5774 * [Do not emit "class method" debuginfo for types that are not
5775 DICompositeType][36008]
5776 * [Warn about multiple conflicting #[repr] hints][34623]
5777 * [When sizing DST, don't double-count nested struct prefixes][36351]
5778 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5779 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5780 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5781 * [Expand macros without recursing to avoid stack overflows][36214]
5786 * [Replace macro backtraces with labeled local uses][35702]
5787 * [Improve error message for misplaced doc comments][33922]
5788 * [Buffer unix and lock windows to prevent message interleaving][35975]
5789 * [Update lifetime errors to specifically note temporaries][36171]
5790 * [Special case a few colors for Windows][36178]
5791 * [Suggest `use self` when such an import resolves][36289]
5792 * [Be more specific when type parameter shadows primitive type][36338]
5793 * Many minor improvements
5795 Compile-time Optimizations
5796 --------------------------
5798 * [Compute and cache HIR hashes at beginning][35854]
5799 * [Don't hash types in loan paths][36004]
5800 * [Cache projections in trans][35761]
5801 * [Optimize the parser's last token handling][36527]
5802 * [Only instantiate #[inline] functions in codegen units referencing
5803 them][36524]. This leads to big improvements in cases where crates export
5804 define many inline functions without using them directly.
5805 * [Lazily allocate TypedArena's first chunk][36592]
5806 * [Don't allocate during default HashSet creation][36734]
5813 * [`overflowing_abs`]
5814 * [`RefCell::try_borrow`]
5815 * [`RefCell::try_borrow_mut`]
5820 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5821 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5823 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5824 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5825 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5826 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5827 * [Use arc4rand on FreeBSD][35884]
5828 * [memrchr: Correct aligned offset computation][35969]
5829 * [Improve Demangling of Rust Symbols][36059]
5830 * [Use monotonic time in condition variables][35048]
5831 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5832 * [Implement conversion traits for `char`][35755]
5833 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5834 * [Zero first byte of CString on drop][36264]
5835 * [Inherit overflow checks for sum and product][36372]
5836 * [Add missing Eq implementations][36423]
5837 * [Implement `Debug` for `DirEntry`][36631]
5838 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5840 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5841 * [Implement more traits for `std::io::ErrorKind`][35911]
5842 * [Optimize BinaryHeap bounds checking][36072]
5843 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5844 `extend_with_element`][36355]
5845 * [Fix overflow checking in unsigned pow()][34942]
5850 * This release includes security fixes to both curl and OpenSSL.
5851 * [Fix transitive doctests when panic=abort][cargo/3021]
5852 * [Add --all-features flag to cargo][cargo/3038]
5853 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5854 * [Don't parse the home directory more than once][cargo/3078]
5855 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5856 * [Update OpenSSL to 1.0.2j][cargo/3121]
5857 * [Add license and license_file to cargo metadata output][cargo/3110]
5858 * [Make crates-io registry URL optional in config; ignore all changes to
5859 source.crates-io][cargo/3089]
5860 * [Don't download dependencies from other platforms][cargo/3123]
5861 * [Build transitive dev-dependencies when needed][cargo/3125]
5862 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5863 * [Avoid updating registry when adding existing deps][cargo/3144]
5864 * [Warn about path overrides that won't work][cargo/3136]
5865 * [Use workspaces during `cargo install`][cargo/3146]
5866 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5867 * [Add --message-format flag][cargo/3000]
5868 * [Pass target environment for rustdoc][cargo/3205]
5869 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5870 * [Update curl and curl-sys][cargo/3241]
5871 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5876 * [rustdoc: Add the `--sysroot` argument][36586]
5877 * [rustdoc: Fix a couple of issues with the search results][35655]
5878 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5879 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5880 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5885 * [Remove unmaintained style guide][35124]
5886 * [Add s390x support][36369]
5887 * [Initial work at Haiku OS support][36727]
5888 * [Add mips-uclibc targets][35734]
5889 * [Crate-ify compiler-rt into compiler-builtins][35021]
5890 * [Add rustc version info (git hash + date) to dist tarball][36213]
5891 * Many documentation improvements
5896 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5897 * [Deny (by default) transmuting from fn item types to pointer-sized
5898 types][34923]. Continuing the long transition to zero-sized fn items,
5900 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5902 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5903 * [Fix lifetime rules for 'if' conditions][36029].
5904 * [Inherit overflow checks for sum and product][36372].
5905 * [Forbid user-defined macros named "macro_rules"][36730].
5907 [33922]: https://github.com/rust-lang/rust/pull/33922
5908 [34623]: https://github.com/rust-lang/rust/pull/34623
5909 [34923]: https://github.com/rust-lang/rust/pull/34923
5910 [34942]: https://github.com/rust-lang/rust/pull/34942
5911 [34982]: https://github.com/rust-lang/rust/pull/34982
5912 [35021]: https://github.com/rust-lang/rust/pull/35021
5913 [35048]: https://github.com/rust-lang/rust/pull/35048
5914 [35074]: https://github.com/rust-lang/rust/pull/35074
5915 [35124]: https://github.com/rust-lang/rust/pull/35124
5916 [35234]: https://github.com/rust-lang/rust/pull/35234
5917 [35238]: https://github.com/rust-lang/rust/pull/35238
5918 [35354]: https://github.com/rust-lang/rust/pull/35354
5919 [35559]: https://github.com/rust-lang/rust/pull/35559
5920 [35585]: https://github.com/rust-lang/rust/pull/35585
5921 [35627]: https://github.com/rust-lang/rust/pull/35627
5922 [35655]: https://github.com/rust-lang/rust/pull/35655
5923 [35702]: https://github.com/rust-lang/rust/pull/35702
5924 [35707]: https://github.com/rust-lang/rust/pull/35707
5925 [35728]: https://github.com/rust-lang/rust/pull/35728
5926 [35734]: https://github.com/rust-lang/rust/pull/35734
5927 [35755]: https://github.com/rust-lang/rust/pull/35755
5928 [35761]: https://github.com/rust-lang/rust/pull/35761
5929 [35764]: https://github.com/rust-lang/rust/pull/35764
5930 [35814]: https://github.com/rust-lang/rust/pull/35814
5931 [35854]: https://github.com/rust-lang/rust/pull/35854
5932 [35871]: https://github.com/rust-lang/rust/pull/35871
5933 [35884]: https://github.com/rust-lang/rust/pull/35884
5934 [35911]: https://github.com/rust-lang/rust/pull/35911
5935 [35969]: https://github.com/rust-lang/rust/pull/35969
5936 [35975]: https://github.com/rust-lang/rust/pull/35975
5937 [36004]: https://github.com/rust-lang/rust/pull/36004
5938 [36008]: https://github.com/rust-lang/rust/pull/36008
5939 [36014]: https://github.com/rust-lang/rust/pull/36014
5940 [36029]: https://github.com/rust-lang/rust/pull/36029
5941 [36059]: https://github.com/rust-lang/rust/pull/36059
5942 [36072]: https://github.com/rust-lang/rust/pull/36072
5943 [36101]: https://github.com/rust-lang/rust/pull/36101
5944 [36104]: https://github.com/rust-lang/rust/pull/36104
5945 [36171]: https://github.com/rust-lang/rust/pull/36171
5946 [36173]: https://github.com/rust-lang/rust/pull/36173
5947 [36178]: https://github.com/rust-lang/rust/pull/36178
5948 [36213]: https://github.com/rust-lang/rust/pull/36213
5949 [36214]: https://github.com/rust-lang/rust/pull/36214
5950 [36264]: https://github.com/rust-lang/rust/pull/36264
5951 [36266]: https://github.com/rust-lang/rust/pull/36266
5952 [36289]: https://github.com/rust-lang/rust/pull/36289
5953 [36338]: https://github.com/rust-lang/rust/pull/36338
5954 [36351]: https://github.com/rust-lang/rust/pull/36351
5955 [36355]: https://github.com/rust-lang/rust/pull/36355
5956 [36369]: https://github.com/rust-lang/rust/pull/36369
5957 [36372]: https://github.com/rust-lang/rust/pull/36372
5958 [36423]: https://github.com/rust-lang/rust/pull/36423
5959 [36482]: https://github.com/rust-lang/rust/pull/36482
5960 [36505]: https://github.com/rust-lang/rust/pull/36505
5961 [36524]: https://github.com/rust-lang/rust/pull/36524
5962 [36527]: https://github.com/rust-lang/rust/pull/36527
5963 [36551]: https://github.com/rust-lang/rust/pull/36551
5964 [36574]: https://github.com/rust-lang/rust/pull/36574
5965 [36586]: https://github.com/rust-lang/rust/pull/36586
5966 [36592]: https://github.com/rust-lang/rust/pull/36592
5967 [36631]: https://github.com/rust-lang/rust/pull/36631
5968 [36639]: https://github.com/rust-lang/rust/pull/36639
5969 [36721]: https://github.com/rust-lang/rust/pull/36721
5970 [36727]: https://github.com/rust-lang/rust/pull/36727
5971 [36730]: https://github.com/rust-lang/rust/pull/36730
5972 [36734]: https://github.com/rust-lang/rust/pull/36734
5973 [36754]: https://github.com/rust-lang/rust/pull/36754
5974 [36995]: https://github.com/rust-lang/rust/pull/36995
5975 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5976 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5977 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5978 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5979 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5980 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5981 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5982 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5983 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5984 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5985 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5986 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5987 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5988 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5989 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5990 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5991 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5992 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5993 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5994 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5995 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5996 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5997 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5998 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5999 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6000 [rustup]: https://www.rustup.rs
6001 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6002 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6003 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6004 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6005 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6006 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6007 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6010 Version 1.12.1 (2016-10-20)
6011 ===========================
6016 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6017 * [Confusion with double negation and booleans][36856]
6018 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6019 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6020 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6021 * [Corrupted memory after updated to 1.12][36936]
6022 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6023 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6024 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6026 [36381]: https://github.com/rust-lang/rust/issues/36381
6027 [36856]: https://github.com/rust-lang/rust/issues/36856
6028 [36875]: https://github.com/rust-lang/rust/issues/36875
6029 [36924]: https://github.com/rust-lang/rust/issues/36924
6030 [36926]: https://github.com/rust-lang/rust/issues/36926
6031 [36936]: https://github.com/rust-lang/rust/issues/36936
6032 [37026]: https://github.com/rust-lang/rust/issues/37026
6033 [37112]: https://github.com/rust-lang/rust/issues/37112
6034 [37153]: https://github.com/rust-lang/rust/issues/37153
6037 Version 1.12.0 (2016-09-29)
6038 ===========================
6043 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6044 This translation pass is far simpler than the previous AST->LLVM pass, and
6045 creates opportunities to perform new optimizations directly on the MIR. It
6046 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6047 * [`rustc` presents a new, more readable error format, along with
6048 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6049 Most common editors supporting Rust have been updated to work with it. It was
6050 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6055 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6056 This translation pass is far simpler than the previous AST->LLVM pass, and
6057 creates opportunities to perform new optimizations directly on the MIR. It
6058 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6059 * [Print the Rust target name, not the LLVM target name, with
6060 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6061 * [The computation of `TypeId` is correct in some cases where it was previously
6062 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6063 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6064 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6065 `--print relocation-models`, and `--print code-models` print the available
6066 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6067 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6068 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6069 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6070 These targets produce statically-linked binaries. There are no binary release
6076 * [`rustc` presents a new, more readable error format, along with
6077 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6078 Most common editors supporting Rust have been updated to work with it. It was
6079 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6080 * [In error descriptions, references are now described in plain English,
6081 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6082 * [In error type descriptions, unknown numeric types are named `{integer}` or
6083 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6084 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6089 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6090 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6091 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6092 useful](https://github.com/rust-lang/rust/pull/34908)
6093 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6094 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6095 * [Semicolons are properly required as statement delimiters inside
6096 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6097 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6102 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6103 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6104 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6105 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6106 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6107 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6108 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6109 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6110 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6111 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6112 Both on Unix and Windows.
6113 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6114 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6115 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6116 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6117 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6118 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6119 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6120 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6125 * [The `format!` macro and friends now allow a single argument to be formatted
6126 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6127 * [The lifetime bounds on `[T]::binary_search_by` and
6128 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6129 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6130 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6131 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6132 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6133 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6134 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6135 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6136 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6137 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6138 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6139 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6140 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6141 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6142 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6143 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6144 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6145 * [`mpsc::sync_channel` `Receiver`s return any available message before
6146 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6147 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6148 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6153 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6154 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6155 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6156 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6157 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6158 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6159 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6160 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6161 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6162 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6163 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6164 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6165 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6166 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6167 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6168 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6173 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6174 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6179 * [Test binaries now support a `--test-threads` argument to specify the number
6180 of threads used to run tests, and which acts the same as the
6181 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6182 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6183 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6184 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6185 * [Rust releases now come with source packages that can be installed by rustup
6186 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6187 The resulting source code can be used by tools and IDES, located in the
6188 sysroot under `lib/rustlib/src`.
6193 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6194 * Many minor improvements to the documentation.
6195 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6200 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6201 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6202 * [When formatting strings, if "precision" is specified, the "fill",
6203 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6204 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6207 Version 1.11.0 (2016-08-18)
6208 ===========================
6213 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6214 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6215 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6216 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6221 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6222 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6223 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6224 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6225 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6226 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6227 (in libcore - previously stabilized in libstd)
6228 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6229 (in libcore - previously stabilized in libstd)
6230 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6231 (in libcore - previously stabilized in libstd)
6232 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6233 (in libcore - previously stabilized in libstd)
6234 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6235 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6236 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6237 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6242 * [The `thread_local!` macro supports multiple definitions in a single
6243 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6244 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6245 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6246 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6247 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6248 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6249 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6250 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6255 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6256 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6257 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6258 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6259 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6260 and `-vv` prints warnings for all crates.
6261 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6262 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6263 This provides room for expansion by arbitrary tools.
6264 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6265 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6266 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6267 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6268 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6269 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6270 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6275 * [Caching projections speeds up type check dramatically for some
6276 workloads](https://github.com/rust-lang/rust/pull/33816)
6277 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6278 This hasher is faster, but is believed to provide sufficient
6279 protection from collision attacks.
6280 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6285 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6286 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6287 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6288 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6289 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6294 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6295 * [When emitting debug info, rustc emits frame pointers for closures,
6296 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6297 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6298 * Many more errors have been given error codes and extended
6300 * API documentation continues to be improved, with many new examples
6305 * [rustc no longer hangs when dependencies recursively re-export
6306 submodules](https://github.com/rust-lang/rust/pull/34542)
6307 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6308 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6309 rewritten](https://github.com/rust-lang/rust/pull/33895)
6310 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6311 No targets use this yet, but it works toward AVR support.
6316 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6317 * [The new follow-set rules that place restrictions on `macro_rules!`
6318 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6319 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6320 and has been a warning since 1.10.
6321 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6322 This causes breakage in some corner cases.
6325 Version 1.10.0 (2016-07-07)
6326 ===========================
6331 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6332 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6333 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6334 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6335 * [`panic!` can be converted to a runtime abort with the
6336 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6337 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6338 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6339 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6340 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6341 Note that Cargo does not yet directly support cdylibs.
6346 * `os::windows::fs::OpenOptionsExt::access_mode`
6347 * `os::windows::fs::OpenOptionsExt::share_mode`
6348 * `os::windows::fs::OpenOptionsExt::custom_flags`
6349 * `os::windows::fs::OpenOptionsExt::attributes`
6350 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6351 * `os::unix::fs::OpenOptionsExt::custom_flags`
6352 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6353 * `Default for sync::Weak`
6354 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6355 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6356 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6357 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6358 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6359 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6360 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6361 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6362 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6363 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6364 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6365 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6366 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6367 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6368 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6369 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6370 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6371 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6372 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6373 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6374 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6375 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6376 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6377 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6378 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6379 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6380 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6381 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6382 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6383 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6384 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6385 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6386 * Read/Write/RawFd impls for `UnixStream`
6387 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6388 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6389 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6390 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6391 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6392 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6393 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6394 * RawFd impls for `UnixListener`
6395 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6396 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6397 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6398 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6399 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6400 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6401 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6402 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6403 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6404 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6405 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6406 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6407 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6408 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6409 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6410 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6411 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6412 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6413 * RawFd impls for `UnixDatagram`
6414 * `{BTree,Hash}Map::values_mut`
6415 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6420 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6421 The semantics of this minor method are subtle and probably not what
6423 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6424 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6425 will fall back to `/dev/urandom` temporarily to avoid blocking
6426 during early boot](https://github.com/rust-lang/rust/pull/33086).
6427 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6428 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6429 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6430 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6431 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6432 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6433 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6437 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6438 This controls the runtime behavior of the `panic!` macro
6439 and can be either "unwind" (the default), or "abort".
6440 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6441 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6442 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6443 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6444 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6445 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6446 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6447 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6448 By default they are retried twice, which can be customized with the
6449 `net.retry` value in `.cargo/config`.
6450 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6451 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6452 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6453 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6454 Makes it possible to install multiple crates in parallel.
6455 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6456 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6457 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6458 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6459 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6460 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6465 * [rustc memory usage was reduced by refactoring the context used for
6466 type checking](https://github.com/rust-lang/rust/pull/33425).
6467 * [Speed up creation of `HashMap`s by caching the random keys used
6468 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6469 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6470 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6471 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6472 10x faster than the previous lookup tables.
6473 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6478 * Many incremental improvements to documentation and rustdoc.
6479 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6480 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6481 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6482 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6483 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6484 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6485 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6490 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6491 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6492 * [`std` no longer prints backtraces on platforms where the running
6493 module must be loaded with `env::current_exe`, which can't be relied
6494 on](https://github.com/rust-lang/rust/pull/33554).
6495 * This release includes std binaries for the i586-unknown-linux-gnu,
6496 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6497 i586 target is for old x86 hardware without SSE2, and the armv7
6498 target is for Android running on modern ARM architectures.
6499 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6500 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6501 * [On Unix the runtime aborts by calling `libc::abort` instead of
6502 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6503 * [Rust is now bootstrapped from the previous release of Rust,
6504 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6509 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6510 * [`target_env` for Linux ARM targets is just `gnu`, not
6511 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6512 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6513 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6514 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6515 Affects how macros are parsed.
6516 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6517 * [Feature-gated attributes on macro-generated macro invocations are
6518 now rejected](https://github.com/rust-lang/rust/pull/32791).
6519 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6520 This caused some minor changes to type inference.
6523 Version 1.9.0 (2016-05-26)
6524 ==========================
6529 * The `#[deprecated]` attribute when applied to an API will generate
6530 warnings when used. The warnings may be suppressed with
6531 `#[allow(deprecated)]`. [RFC 1270].
6532 * [`fn` item types are zero sized, and each `fn` names a unique
6533 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6534 `transmute` on a `fn` type will generate a warning for a few cycles,
6535 then will be converted to an error.
6536 * [Field and method resolution understand visibility, so private
6537 fields and methods cannot prevent the proper use of public fields
6538 and methods][1.9fv].
6539 * [The parser considers unicode codepoints in the
6540 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6546 * [`std::panic::catch_unwind`] (renamed from `recover`)
6547 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6548 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6549 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6550 * [`str::is_char_boundary`]
6551 * [`<*const T>::as_ref`]
6552 * [`<*mut T>::as_ref`]
6553 * [`<*mut T>::as_mut`]
6554 * [`AsciiExt::make_ascii_uppercase`]
6555 * [`AsciiExt::make_ascii_lowercase`]
6556 * [`char::decode_utf16`]
6557 * [`char::DecodeUtf16`]
6558 * [`char::DecodeUtf16Error`]
6559 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6560 * [`BTreeSet::take`]
6561 * [`BTreeSet::replace`]
6564 * [`HashSet::replace`]
6566 * [`OsString::with_capacity`]
6567 * [`OsString::clear`]
6568 * [`OsString::capacity`]
6569 * [`OsString::reserve`]
6570 * [`OsString::reserve_exact`]
6571 * [`OsStr::is_empty`]
6573 * [`std::os::unix::thread`]
6576 * [`JoinHandleExt::as_pthread_t`]
6577 * [`JoinHandleExt::into_pthread_t`]
6578 * [`HashSet::hasher`]
6579 * [`HashMap::hasher`]
6580 * [`CommandExt::exec`]
6581 * [`File::try_clone`]
6582 * [`SocketAddr::set_ip`]
6583 * [`SocketAddr::set_port`]
6584 * [`SocketAddrV4::set_ip`]
6585 * [`SocketAddrV4::set_port`]
6586 * [`SocketAddrV6::set_ip`]
6587 * [`SocketAddrV6::set_port`]
6588 * [`SocketAddrV6::set_flowinfo`]
6589 * [`SocketAddrV6::set_scope_id`]
6590 * [`slice::copy_from_slice`]
6591 * [`ptr::read_volatile`]
6592 * [`ptr::write_volatile`]
6593 * [`OpenOptions::create_new`]
6594 * [`TcpStream::set_nodelay`]
6595 * [`TcpStream::nodelay`]
6596 * [`TcpStream::set_ttl`]
6597 * [`TcpStream::ttl`]
6598 * [`TcpStream::set_only_v6`]
6599 * [`TcpStream::only_v6`]
6600 * [`TcpStream::take_error`]
6601 * [`TcpStream::set_nonblocking`]
6602 * [`TcpListener::set_ttl`]
6603 * [`TcpListener::ttl`]
6604 * [`TcpListener::set_only_v6`]
6605 * [`TcpListener::only_v6`]
6606 * [`TcpListener::take_error`]
6607 * [`TcpListener::set_nonblocking`]
6608 * [`UdpSocket::set_broadcast`]
6609 * [`UdpSocket::broadcast`]
6610 * [`UdpSocket::set_multicast_loop_v4`]
6611 * [`UdpSocket::multicast_loop_v4`]
6612 * [`UdpSocket::set_multicast_ttl_v4`]
6613 * [`UdpSocket::multicast_ttl_v4`]
6614 * [`UdpSocket::set_multicast_loop_v6`]
6615 * [`UdpSocket::multicast_loop_v6`]
6616 * [`UdpSocket::set_multicast_ttl_v6`]
6617 * [`UdpSocket::multicast_ttl_v6`]
6618 * [`UdpSocket::set_ttl`]
6619 * [`UdpSocket::ttl`]
6620 * [`UdpSocket::set_only_v6`]
6621 * [`UdpSocket::only_v6`]
6622 * [`UdpSocket::join_multicast_v4`]
6623 * [`UdpSocket::join_multicast_v6`]
6624 * [`UdpSocket::leave_multicast_v4`]
6625 * [`UdpSocket::leave_multicast_v6`]
6626 * [`UdpSocket::take_error`]
6627 * [`UdpSocket::connect`]
6628 * [`UdpSocket::send`]
6629 * [`UdpSocket::recv`]
6630 * [`UdpSocket::set_nonblocking`]
6635 * [`std::sync::Once` is poisoned if its initialization function
6637 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6638 * [Most types implement `fmt::Debug`][1.9db].
6639 * [The default buffer size used by `BufReader` and `BufWriter` was
6640 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6641 used by other languages.
6642 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6643 `Duration` additionally implements `*=` and `/=`][1.9ta].
6644 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6645 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6646 * [`Chain` implements `BufRead`][1.9ch].
6647 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6652 * [Cargo can now run concurrently][1.9cc].
6653 * [Top-level overrides allow specific revisions of crates to be
6654 overridden through the entire crate graph][1.9ct]. This is intended
6655 to make upgrades easier for large projects, by allowing crates to be
6656 forked temporarily until they've been upgraded and republished.
6657 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6658 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6659 on the commandline][1.9cf]. `rustc` arguments can also be specified
6660 in the `build.rustflags` configuration key.
6665 * [The time complexity of comparing variables for equivalence during type
6666 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6667 to major compilation time improvement in some scenarios.
6668 * [`ToString` is specialized for `str`, giving it the same performance
6669 as `to_owned`][1.9ts].
6670 * [Spawning processes with `Command::output` no longer creates extra
6672 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6673 for C-like enums][1.9cl].
6678 * [Passing the `--quiet` flag to a test runner will produce
6679 much-abbreviated output][1.9q].
6680 * The Rust Project now publishes std binaries for the
6681 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6682 `i586-pc-windows-msvc` targets.
6687 * [`std::sync::Once` is poisoned if its initialization function
6689 * [It is illegal to define methods with the same name in overlapping
6690 inherent `impl` blocks][1.9sn].
6691 * [`fn` item types are zero sized, and each `fn` names a unique
6692 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6693 `transmute` on a `fn` type will generate a warning for a few cycles,
6694 then will be converted to an error.
6695 * [Improvements to const evaluation may trigger new errors when integer
6696 literals are out of range][1.9ce].
6699 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6700 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6701 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6702 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6703 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6704 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6705 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6706 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6707 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6708 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6709 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6710 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6711 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6712 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6713 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6714 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6715 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6716 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6717 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6718 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6719 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6720 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6721 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6722 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6723 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6724 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6725 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6726 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6727 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6728 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6729 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6730 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6731 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6732 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6733 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6734 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6735 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6736 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6737 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6738 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6739 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6740 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6741 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6742 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6743 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6744 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6745 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6746 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6747 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6748 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6749 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6750 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6751 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6752 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6753 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6754 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6755 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6756 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6757 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6758 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6759 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6760 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6761 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6762 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6763 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6764 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6765 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6766 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6767 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6768 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6769 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6770 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6771 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6772 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6773 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6774 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6775 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6776 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6777 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6778 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6779 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6780 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6781 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6782 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6783 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6784 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6785 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6786 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6787 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6788 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6789 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6790 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6791 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6792 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6793 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6794 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6795 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6796 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6797 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6798 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6799 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6800 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6801 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6802 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6803 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6804 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6805 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6806 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6807 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6808 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6811 Version 1.8.0 (2016-04-14)
6812 ==========================
6817 * Rust supports overloading of compound assignment statements like
6818 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6819 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6820 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6822 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6823 addition to the non-braced form, `struct Foo;`. [RFC 218].
6829 * [`str::encode_utf16`] (renamed from `utf16_units`)
6830 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6833 * [`ptr::drop_in_place`]
6835 * [`time::SystemTime`]
6837 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6838 * [`Instant::elapsed`]
6839 * [`SystemTime::now`]
6840 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6841 * [`SystemTime::elapsed`]
6842 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6843 * [`SystemTimeError`]
6844 * [`SystemTimeError::duration`]
6845 * Various impls for `SystemTimeError`
6847 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6848 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6849 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6850 * [The `write!` and `writeln!` macros correctly emit errors if any of
6851 their arguments can't be formatted][1.8w].
6852 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6853 * [The Unix-specific `raw` modules, which contain a number of
6854 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6855 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6856 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6857 across platforms was making it difficult to implement `std`
6858 correctly. Those that need these definitions should use the `libc`
6860 * The Unix-specific `MetadataExt` traits, including
6861 `os::unix::fs::MetadataExt`, which expose values such as inode
6862 numbers [no longer return platform-specific types][1.8r], but
6863 instead return widened integers. [RFC 1415].
6864 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6865 * [Atomic loads and stores are not volatile][1.8a].
6866 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6871 * [Inlining hash functions lead to a 3% compile-time improvement in
6872 some workloads][1.8h].
6873 * When using jemalloc, its symbols are [unprefixed so that it
6874 overrides the libc malloc implementation][1.8h]. This means that for
6875 rustc, LLVM is now using jemalloc, which results in a 6%
6876 compile-time improvement on a specific workload.
6877 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6882 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6883 i686-pc-windows-msvc is now considered a tier-1 platform.
6884 * [The `--print targets` flag prints a list of supported targets][1.8t].
6885 * [The `--print cfg` flag prints the `cfg`s defined for the current
6887 * [`rustc` can be built with an new Cargo-based build system, written
6888 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6889 build system. To enable it configure with `configure --rustbuild`.
6890 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6891 variants while also indicating the total number of missing variants
6892 if more than 3][1.8m].
6893 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6894 * The Rust Project now publishes binary releases of the standard
6895 library for a number of tier-2 targets:
6896 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6897 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6898 `x86_64-rumprun-netbsd`. These can be installed with
6899 tools such as [multirust][1.8mr].
6904 * [`cargo init` creates a new Cargo project in the current
6905 directory][1.8ci]. It is otherwise like `cargo new`.
6906 * [Cargo has configuration keys for `-v` and
6907 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6908 `[term]` section of `.cargo/config`.
6909 * [Configuration keys that evaluate to strings or integers can be set
6910 via environment variables][1.8ce]. For example the `build.jobs` key
6911 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6912 precedence over config files.
6913 * [Target-specific dependencies support Rust `cfg` syntax for
6914 describing targets][1.8cfg] so that dependencies for multiple
6915 targets can be specified together. [RFC 1361].
6916 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6917 `RUSTDOC` take precedence over the `build.target-dir`,
6918 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6919 * [The child process tree is killed on Windows when Cargo is
6921 * [The `build.target` configuration value sets the target platform,
6922 like `--target`][1.8ct].
6927 * [Unstable compiler flags have been further restricted][1.8u]. Since
6928 1.0 `-Z` flags have been considered unstable, and other flags that
6929 were considered unstable additionally required passing `-Z
6930 unstable-options` to access. Unlike unstable language and library
6931 features though, these options have been accessible on the stable
6932 release channel. Going forward, *new unstable flags will not be
6933 available on the stable release channel*, and old unstable flags
6934 will warn about their usage. In the future, all unstable flags will
6935 be unavailable on the stable release channel.
6936 * [It is no longer possible to `match` on empty enum variants using
6937 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6938 * The Unix-specific `MetadataExt` traits, including
6939 `os::unix::fs::MetadataExt`, which expose values such as inode
6940 numbers [no longer return platform-specific types][1.8r], but
6941 instead return widened integers. [RFC 1415].
6942 * [Modules sourced from the filesystem cannot appear within arbitrary
6943 blocks, but only within other modules][1.8mf].
6944 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6945 * On Unix, [stack overflow triggers a runtime abort instead of a
6947 * [`Command::spawn` and its equivalents return an error if any of
6948 its command-line arguments contain interior `NUL`s][1.8n].
6949 * [Tuple and unit enum variants from other crates are in the type
6951 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6952 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6953 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6954 instead of `foo.lib`.
6957 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6958 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6959 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6960 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6961 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6962 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6963 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6964 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6965 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6966 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6967 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6968 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6969 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6970 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6971 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6972 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6973 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6974 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6975 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6976 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6977 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6978 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6979 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6980 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6981 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6982 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6983 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6984 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6985 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6986 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6987 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6988 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6989 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6990 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6991 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6992 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6993 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6994 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6995 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6996 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6997 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6998 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6999 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7000 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7001 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7002 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7003 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7004 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7005 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7006 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7007 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7008 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7009 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7010 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7011 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7012 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7013 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7014 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7015 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7016 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7019 Version 1.7.0 (2016-03-03)
7020 ==========================
7027 * [`Path::strip_prefix`] (renamed from relative_from)
7028 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7030 * [`Ipv4Addr::is_loopback`]
7031 * [`Ipv4Addr::is_private`]
7032 * [`Ipv4Addr::is_link_local`]
7033 * [`Ipv4Addr::is_multicast`]
7034 * [`Ipv4Addr::is_broadcast`]
7035 * [`Ipv4Addr::is_documentation`]
7037 * [`Ipv6Addr::is_unspecified`]
7038 * [`Ipv6Addr::is_loopback`]
7039 * [`Ipv6Addr::is_multicast`]
7042 * [`Vec::as_mut_slice`]
7044 * [`String::as_str`]
7045 * [`String::as_mut_str`]
7047 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7049 * `<[T]>::`[`sort_by_key`]
7050 * checked, saturated, and overflowing operations
7051 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7052 * [`i32::saturating_mul`]
7053 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7054 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7055 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7056 * [`u32::saturating_mul`]
7057 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7058 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7059 * and checked, saturated, and overflowing operations for other primitive types
7061 * [`ffi::IntoStringError`]
7062 * [`CString::into_string`]
7063 * [`CString::into_bytes`]
7064 * [`CString::into_bytes_with_nul`]
7065 * `From<CString> for Vec<u8>`
7067 * [`IntoStringError::into_cstring`]
7068 * [`IntoStringError::utf8_error`]
7069 * `Error for IntoStringError`
7071 * [`std::hash::BuildHasher`]
7072 * [`BuildHasher::Hasher`]
7073 * [`BuildHasher::build_hasher`]
7074 * [`std::hash::BuildHasherDefault`]
7075 * [`HashMap::with_hasher`]
7076 * [`HashMap::with_capacity_and_hasher`]
7077 * [`HashSet::with_hasher`]
7078 * [`HashSet::with_capacity_and_hasher`]
7079 * [`std::collections::hash_map::RandomState`]
7080 * [`RandomState::new`]
7081 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7082 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7083 from bytes is faster.
7084 * [The performance of `LineWriter` (and thus `io::stdout`) was
7085 improved by using `memchr` to search for newlines][1.7m].
7086 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7087 `f64` variants were stabilized previously.
7088 * [`BTreeMap` was rewritten to use less memory and improve the performance
7089 of insertion and iteration, the latter by as much as 5x][1.7bm].
7090 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7091 covariant over their contained type][1.7bt].
7092 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7093 over their contained type][1.7ll].
7094 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7096 * [`Any` is implemented for unsized types][1.7a].
7097 * [`Hash` is implemented for `Duration`][1.7h].
7102 * [When running tests with `--test`, rustdoc will pass `--cfg`
7103 arguments to the compiler][1.7dt].
7104 * [The compiler is built with RPATH information by default][1.7rpa].
7105 This means that it will be possible to run `rustc` when installed in
7106 unusual configurations without configuring the dynamic linker search
7108 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7109 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7110 over `LD_LIBRARY_PATH`.
7115 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7116 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7117 * [The `rerun-if-changed` build script directive no longer causes the
7118 build script to incorrectly run twice in certain scenarios][1.7rr].
7123 * Soundness fixes to the interactions between associated types and
7124 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7125 code that violates the new rules. This is a significant change that
7126 is known to break existing code, so it has emitted warnings for the
7127 new error cases since 1.4 to give crate authors time to adapt. The
7128 details of what is changing are subtle; read the RFC for more.
7129 * [Several bugs in the compiler's visibility calculations were
7130 fixed][1.7v]. Since this was found to break significant amounts of
7131 code, the new errors will be emitted as warnings for several release
7132 cycles, under the `private_in_public` lint.
7133 * Defaulted type parameters were accidentally accepted in positions
7134 that were not intended. In this release, [defaulted type parameters
7135 appearing outside of type definitions will generate a
7136 warning][1.7d], which will become an error in future releases.
7137 * [Parsing "." as a float results in an error instead of 0][1.7p].
7138 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7139 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7141 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7142 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7143 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7144 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7145 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7146 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7147 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7148 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7149 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7150 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7151 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7152 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7153 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7154 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7155 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7156 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7157 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7158 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7159 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7160 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7161 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7162 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7163 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7164 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7165 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7166 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7167 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7168 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7169 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7170 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7171 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7172 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7173 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7174 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7175 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7176 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7177 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7178 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7179 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7180 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7181 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7182 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7183 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7184 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7185 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7186 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7187 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7188 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7189 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7190 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7191 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7192 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7193 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7194 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7195 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7196 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7197 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7198 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7199 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7200 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7201 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7202 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7203 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7204 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7205 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7206 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7207 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7208 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7209 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7210 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7211 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7212 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7213 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7214 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7215 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7216 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7217 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7218 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7219 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7222 Version 1.6.0 (2016-01-21)
7223 ==========================
7228 * The `#![no_std]` attribute causes a crate to not be linked to the
7229 standard library, but only the [core library][1.6co], as described
7230 in [RFC 1184]. The core library defines common types and traits but
7231 has no platform dependencies whatsoever, and is the basis for Rust
7232 software in environments that cannot support a full port of the
7233 standard library, such as operating systems. Most of the core
7234 library is now stable.
7240 [`Read::read_exact`],
7241 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7242 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7243 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7244 [`os::unix::fs::DirBuilderExt`],
7245 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7246 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7247 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7248 [`collections::hash_map::Drain`],
7249 [`collections::hash_map::HashMap::drain`],
7250 [`collections::hash_set::Drain`],
7251 [`collections::hash_set::HashSet::drain`],
7252 [`collections::binary_heap::Drain`],
7253 [`collections::binary_heap::BinaryHeap::drain`],
7254 [`Vec::extend_from_slice`] (renamed from `push_all`),
7255 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7256 [`RwLock::into_inner`],
7257 [`Iterator::min_by_key`] (renamed from `min_by`),
7258 [`Iterator::max_by_key`] (renamed from `max_by`).
7259 * The [core library][1.6co] is stable, as are most of its APIs.
7260 * [The `assert_eq!` macro supports arguments that don't implement
7261 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7263 * Several timer functions that take duration in milliseconds [are
7264 deprecated in favor of those that take `Duration`][1.6ms]. These
7265 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7266 `thread::park_timeout_ms`.
7267 * The algorithm by which `Vec` reserves additional elements was
7268 [tweaked to not allocate excessive space][1.6a] while still growing
7270 * `From` conversions are [implemented from integers to floats][1.6f]
7271 in cases where the conversion is lossless. Thus they are not
7272 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7273 or `f64`. They are also not implemented for `isize` and `usize`
7274 because the implementations would be platform-specific. `From` is
7275 also implemented from `f32` to `f64`.
7276 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7277 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7278 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7279 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7281 * Sorting slices that are already sorted [is 50% faster in some
7287 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7288 * Cargo build scripts can specify their dependencies by emitting the
7289 [`rerun-if-changed`][1.6rr] key.
7290 * crates.io will reject publication of crates with dependencies that
7291 have a wildcard version constraint. Crates with wildcard
7292 dependencies were seen to cause a variety of problems, as described
7293 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7295 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7296 release folder. A variety of artifacts that Cargo failed to clean
7297 are now correctly deleted.
7302 * The `unreachable_code` lint [warns when a function call's argument
7304 * The parser indicates [failures that may be caused by
7305 confusingly-similar Unicode characters][1.6uc]
7306 * Certain macro errors [are reported at definition time][1.6m], not
7312 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7313 environment variable when locating crates. This was a pre-cargo
7314 feature for integrating with the package manager that was
7315 accidentally never removed.
7316 * [A number of bugs were fixed in the privacy checker][1.6p] that
7317 could cause previously-accepted code to break.
7318 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7319 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7320 struct pattern syntax (`Foo(..)`) can no longer be used to match
7321 unit structs. This is a warning now, but will become an error in
7322 future releases. Patterns that share the same name as a const are
7324 * A bug was fixed that causes [rustc not to apply default type
7325 parameters][1.6xc] when resolving certain method implementations of
7326 traits defined in other crates.
7328 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7329 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7330 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7331 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7332 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7333 [1.6co]: http://doc.rust-lang.org/core/index.html
7334 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7335 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7336 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7337 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7338 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7339 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7340 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7341 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7342 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7343 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7344 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7345 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7346 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7347 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7348 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7349 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7350 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7351 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7352 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7353 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7354 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7355 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7356 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7357 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7358 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7359 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7360 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7361 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7362 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7363 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7364 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7365 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7366 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7367 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7368 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7369 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7370 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7371 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7372 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7373 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7374 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7377 Version 1.5.0 (2015-12-10)
7378 ==========================
7380 * ~700 changes, numerous bugfixes
7386 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7387 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7388 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7389 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7390 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7391 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7392 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7393 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7394 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7395 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7396 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7397 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7398 [`Path::read_link`], [`Path::symlink_metadata`],
7399 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7400 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7401 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7402 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7403 [`slice::split_first_mut`], [`slice::split_first`],
7404 [`slice::split_last_mut`], [`slice::split_last`],
7405 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7406 [`str::MatchIndices`], [`str::RMatchIndices`],
7407 [`str::match_indices`], [`str::rmatch_indices`],
7408 [`str::slice_mut_unchecked`], [`string::ParseError`].
7409 * Rust applications hosted on crates.io can be installed locally to
7410 `~/.cargo/bin` with the [`cargo install`] command. Among other
7411 things this makes it easier to augment Cargo with new subcommands:
7412 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7413 invoked as `cargo foo`.
7414 * Crates with wildcard (`*`) dependencies will [emit warnings when
7415 published][1.5w]. In 1.6 it will no longer be possible to publish
7416 crates with wildcard dependencies.
7421 * The rules determining when a particular lifetime must outlive
7422 a particular value (known as '[dropck]') have been [modified
7423 to not rely on parametricity][1.5p].
7424 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7425 and `Arc`][1.5a]. Because these smart pointer types implement
7426 `Deref`, this causes breakage in cases where the interior type
7427 contains methods of the same name.
7428 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7429 that they could drop their content. Soundness fix.
7430 * All method invocations are [properly checked][1.5wf1] for
7431 [well-formedness][1.5wf2]. Soundness fix.
7432 * Traits whose supertraits contain `Self` are [not object
7433 safe][1.5o]. Soundness fix.
7434 * Target specifications support a [`no_default_libraries`][1.5nd]
7435 setting that controls whether `-nodefaultlibs` is passed to the
7436 linker, and in turn the `is_like_windows` setting no longer affects
7437 the `-nodefaultlibs` flag.
7438 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7439 * The `#[inline]` and `#[repr]` attributes [can only appear
7440 in valid locations][1.5at].
7441 * Native libraries linked from the local crate are [passed to
7442 the linker before native libraries from upstream crates][1.5nl].
7443 * Two rarely-used attributes, `#[no_debug]` and
7444 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7445 * Negation of unsigned integers, which has been a warning for
7446 several releases, [is now behind a feature gate and will
7447 generate errors][1.5nu].
7448 * The parser accidentally accepted visibility modifiers on
7449 enum variants, a bug [which has been fixed][1.5ev].
7450 * [A bug was fixed that allowed `use` statements to import unstable
7456 * When evaluating expressions at compile-time that are not
7457 compile-time constants (const-evaluating expressions in non-const
7458 contexts), incorrect code such as overlong bitshifts and arithmetic
7459 overflow will [generate a warning instead of an error][1.5ce],
7460 delaying the error until runtime. This will allow the
7461 const-evaluator to be expanded in the future backwards-compatibly.
7462 * The `improper_ctypes` lint [no longer warns about using `isize` and
7463 `usize` in FFI][1.5ict].
7468 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7470 * `Default` is [implemented for mutable slices][1.5d].
7471 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7472 * There are now `From` conversions [between floating point
7473 types][1.5f] where the conversions are lossless.
7474 * There are now `From` conversions [between integer types][1.5i] where
7475 the conversions are lossless.
7476 * [`fs::Metadata` implements `Clone`][1.5fs].
7477 * The `parse` method [accepts a leading "+" when parsing
7479 * [`AsMut` is implemented for `Vec`][1.5am].
7480 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7481 been optimized][1.5cf] and no longer rely on the default impl.
7482 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7483 `unsafe extern "C"` function types now [implement `Clone`,
7484 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7485 `fmt::Debug` for up to 12 arguments][1.5fp].
7486 * [Dropping `Vec`s is much faster in unoptimized builds when the
7487 element types don't implement `Drop`][1.5dv].
7488 * A bug that caused in incorrect behavior when [combining `VecDeque`
7489 with zero-sized types][1.5vdz] was resolved.
7490 * [`PartialOrd` for slices is faster][1.5po].
7495 * [Crate metadata size was reduced by 20%][1.5md].
7496 * [Improvements to code generation reduced the size of libcore by 3.3
7497 MB and rustc's memory usage by 18MB][1.5m].
7498 * [Improvements to deref translation increased performance in
7499 unoptimized builds][1.5dr].
7500 * Various errors in trait resolution [are deduplicated to only be
7501 reported once][1.5te].
7502 * Rust has preliminary [support for rumprun kernels][1.5rr].
7503 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7505 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7506 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7507 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7508 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7509 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7510 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7511 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7512 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7513 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7514 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7515 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7516 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7517 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7518 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7519 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7520 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7521 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7522 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7523 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7524 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7525 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7526 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7527 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7528 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7529 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7530 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7531 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7532 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7533 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7534 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7535 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7536 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7537 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7538 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7539 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7540 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7541 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7542 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7543 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7544 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7545 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7546 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7547 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7548 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7549 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7550 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7551 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7552 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7553 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7554 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7555 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7556 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7557 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7558 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7559 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7560 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7561 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7562 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7563 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7564 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7565 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7566 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7567 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7568 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7569 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7570 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7571 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7572 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7573 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7574 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7575 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7576 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7577 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7578 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7579 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7580 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7581 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7582 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7583 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7584 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7585 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7586 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7587 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7588 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7589 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7590 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7591 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7592 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7593 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7595 Version 1.4.0 (2015-10-29)
7596 ==========================
7598 * ~1200 changes, numerous bugfixes
7603 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7604 GNU) are now supported and recommended for use.
7609 * [Several changes have been made to fix type soundness and improve
7610 the behavior of associated types][sound]. See [RFC 1214]. Although
7611 we have mostly introduced these changes as warnings this release, to
7612 become errors next release, there are still some scenarios that will
7613 see immediate breakage.
7614 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7615 line breaks in addition to `\n`][crlf].
7616 * [Loans of `'static` lifetime extend to the end of a function][stat].
7617 * [`str::parse` no longer introduces avoidable rounding error when
7618 parsing floating point numbers. Together with earlier changes to
7619 float formatting/output, "round trips" like f.to_string().parse()
7620 now preserve the value of f exactly. Additionally, leading plus
7621 signs are now accepted][fp3].
7627 * `use` statements that import multiple items [can now rename
7628 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7629 * [Binops work correctly on fat pointers][binfat].
7630 * `pub extern crate`, which does not behave as expected, [issues a
7631 warning][pec] until a better solution is found.
7636 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7637 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7638 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7639 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7640 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7641 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7642 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7643 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7644 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7645 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7646 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7647 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7648 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7649 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7650 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7651 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7652 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7653 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7655 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7656 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7657 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7658 `f64::from_str_radix`.
7659 * [Reverse-searching strings is faster with the 'two-way'
7661 * [`std::io::copy` allows `?Sized` arguments][cc].
7662 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7663 [override `count`, `nth` and `last` with an O(1)
7664 implementation][it].
7665 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7666 * [`IntoRawFd` has been added to the Unix-specific prelude,
7667 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7669 * [`Extend<String>` and `FromIterator<String` are both implemented for
7671 * [`IntoIterator` is implemented for references to `Option` and
7673 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7674 Copy`][ext] as part of [RFC 839]. This will cause type inference
7675 breakage in rare situations.
7676 * [`BinaryHeap` implements `Debug`][bh2].
7677 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7679 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7680 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7681 * [String comparison is faster][faststr].
7682 * `&mut T` where `T: std::fmt::Write` [also implements
7683 `std::fmt::Write`][mutw].
7684 * [A stable regression in `VecDeque::push_back` and other
7685 capacity-altering methods that caused panics for zero-sized types
7687 * [Function pointers implement traits for up to 12 parameters][fp2].
7692 * The compiler [no longer uses the 'morestack' feature to prevent
7693 stack overflow][mm]. Instead it uses guard pages and stack
7694 probes (though stack probes are not yet implemented on any platform
7696 * [The compiler matches traits faster when projections are involved][p].
7697 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7699 * [Cargo now displays useful information about what its doing during
7700 `cargo update`][cu].
7702 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7703 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7704 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7705 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7706 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7707 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7708 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7709 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7710 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7711 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7712 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7713 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7714 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7715 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7716 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7717 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7718 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7719 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7720 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7721 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7722 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7723 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7724 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7725 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7726 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7727 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7728 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7729 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7730 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7731 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7732 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7733 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7734 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7735 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7736 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7737 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7738 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7739 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7740 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7741 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7742 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7743 [bh2]: https://github.com/rust-lang/rust/pull/28156
7744 [binfat]: https://github.com/rust-lang/rust/pull/28270
7745 [bm]: https://github.com/rust-lang/rust/pull/28197
7746 [cc]: https://github.com/rust-lang/rust/pull/27531
7747 [crlf]: https://github.com/rust-lang/rust/pull/28034
7748 [cu]: https://github.com/rust-lang/cargo/pull/1931
7749 [d]: https://github.com/rust-lang/rust/pull/27825
7750 [dep]: https://github.com/rust-lang/rust/pull/28339
7751 [es]: https://github.com/rust-lang/rust/pull/27956
7752 [ext]: https://github.com/rust-lang/rust/pull/28094
7753 [faststr]: https://github.com/rust-lang/rust/pull/28338
7754 [ffi]: https://github.com/rust-lang/rust/pull/28779
7755 [fp]: https://github.com/rust-lang/rust/pull/28268
7756 [fp2]: https://github.com/rust-lang/rust/pull/28560
7757 [fp3]: https://github.com/rust-lang/rust/pull/27307
7758 [i]: https://github.com/rust-lang/rust/pull/27451
7759 [into2]: https://github.com/rust-lang/rust/pull/28039
7760 [it]: https://github.com/rust-lang/rust/pull/27652
7761 [mm]: https://github.com/rust-lang/rust/pull/27338
7762 [mutw]: https://github.com/rust-lang/rust/pull/28368
7763 [sound]: https://github.com/rust-lang/rust/pull/27641
7764 [p]: https://github.com/rust-lang/rust/pull/27866
7765 [pec]: https://github.com/rust-lang/rust/pull/28486
7766 [pr]: https://github.com/rust-lang/rust/pull/27896
7767 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7768 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7769 [s]: https://github.com/rust-lang/rust/pull/27474
7770 [stab]: https://github.com/rust-lang/rust/pull/28339
7771 [stat]: https://github.com/rust-lang/rust/pull/28321
7772 [vd]: https://github.com/rust-lang/rust/pull/28494
7774 Version 1.3.0 (2015-09-17)
7775 ==============================
7777 * ~900 changes, numerous bugfixes
7782 * The [new object lifetime defaults][nold] have been [turned
7783 on][nold2] after a cycle of warnings about the change. Now types
7784 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7785 being interpreted as `&'a Box<Trait+'a>` to `&'a
7786 Box<Trait+'static>`.
7787 * [The Rustonomicon][nom] is a new book in the official documentation
7788 that dives into writing unsafe Rust.
7789 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7790 timekeeping is employed by other std APIs, as well as out-of-tree
7796 * The [new object lifetime defaults][nold] have been [turned
7797 on][nold2] after a cycle of warnings about the change.
7798 * There is a known [regression][lr] in how object lifetime elision is
7799 interpreted, the proper solution for which is undetermined.
7800 * The `#[prelude_import]` attribute, an internal implementation
7801 detail, was accidentally stabilized previously. [It has been put
7802 behind the `prelude_import` feature gate][pi]. This change is
7803 believed to break no existing code.
7804 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7805 [more sane for dynamically sized types][dst3]. Code that relied on
7806 the previous behavior is thought to be broken.
7807 * The `dropck` rules, which checks that destructors can't access
7808 destroyed values, [have been updated][dropck] to match the
7809 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7810 cause some previously-compiling code to no longer build.
7815 * The [new object lifetime defaults][nold] have been [turned
7816 on][nold2] after a cycle of warnings about the change.
7817 * Semicolons may [now follow types and paths in
7818 macros](https://github.com/rust-lang/rust/pull/27000).
7819 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7820 [more sane for dynamically sized types][dst3]. Code that relied on
7821 the previous behavior is not known to exist, and suspected to be
7823 * `'static` variables [may now be recursive][st].
7824 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7825 implementations correctly.
7826 * The `dropck` rules, which checks that destructors can't access
7827 destroyed values, [have been updated][dropck] to match the
7833 * The [`Duration`] API, [has been stabilized][ds], as well as the
7834 `std::time` module, which presently contains only `Duration`.
7835 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7836 * The owned C string, [`CString`], implements [`Borrow`] and the
7837 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7838 these allow C strings to be borrowed and cloned in generic code.
7839 * [`CStr`] implements [`Debug`].
7840 * [`AtomicPtr`] implements [`Debug`].
7841 * [`Error`] trait objects [can be downcast to their concrete types][e]
7842 in many common configurations, using the [`is`], [`downcast`],
7843 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7845 * Searching for substrings now [employs the two-way algorithm][search]
7846 instead of doing a naive search. This gives major speedups to a
7847 number of methods, including [`contains`][sc], [`find`][sf],
7848 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7849 [`ends_with`][sew] are also faster.
7850 * The performance of `PartialEq` for slices is [much faster][ps].
7851 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7852 is overridden and optimized by the implementations for scalars.
7853 * The [`Hasher`] trait now has a number of specialized `write_*`
7854 methods for primitive types, for efficiency.
7855 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7856 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7857 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7858 of [`std::error::Error::cause`][iec] also delegates to the inner
7860 * [`process::Child`][pc] gained the [`id`] method, which returns a
7861 `u32` representing the platform-specific process identifier.
7862 * The [`connect`] method on slices is deprecated, replaced by the new
7863 [`join`] method (note that both of these are on the *unstable*
7864 [`SliceConcatExt`] trait, but through the magic of the prelude are
7865 available to stable code anyway).
7866 * The [`Div`] operator is implemented for [`Wrapping`] types.
7867 * [`DerefMut` is implemented for `String`][dms].
7868 * Performance of SipHash (the default hasher for `HashMap`) is
7869 [better for long data][sh].
7870 * [`AtomicPtr`] implements [`Send`].
7871 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7872 are now [specialized to use uninitialized buffers for increased
7874 * Lifetime parameters of foreign functions [are now resolved
7880 * Rust can now, with some coercion, [produce programs that run on
7881 Windows XP][xp], though XP is not considered a supported platform.
7882 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7883 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7884 recommended for use in 1.3, though should be fully-functional
7885 in the [64-bit 1.4 beta][b14].
7886 * On Fedora-based systems installation will [properly configure the
7887 dynamic linker][fl].
7888 * The compiler gained many new extended error descriptions, which can
7889 be accessed with the `--explain` flag.
7890 * The `dropck` pass, which checks that destructors can't access
7891 destroyed values, [has been rewritten][dropck]. This fixes some
7892 soundness holes, and as such will cause some previously-compiling
7893 code to no longer build.
7894 * `rustc` now uses [LLVM to write archive files where possible][ar].
7895 Eventually this will eliminate the compiler's dependency on the ar
7897 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7898 supported FreeBSD on x86_64).
7899 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7900 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7902 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7903 will kill the process instead of leaking][nlp].
7905 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7906 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7907 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7908 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7909 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7910 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7911 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7912 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7913 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7914 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7915 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7916 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7917 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7918 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7919 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7920 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7921 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7922 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7923 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7924 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7925 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7926 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7927 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7928 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7929 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7930 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7931 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7932 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7933 [ar]: https://github.com/rust-lang/rust/pull/26926
7934 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7935 [dms]: https://github.com/rust-lang/rust/pull/26241
7936 [dropck]: https://github.com/rust-lang/rust/pull/27261
7937 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7938 [ds]: https://github.com/rust-lang/rust/pull/26818
7939 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7940 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7941 [dst3]: https://github.com/rust-lang/rust/pull/27351
7942 [e]: https://github.com/rust-lang/rust/pull/24793
7943 [f]: https://github.com/rust-lang/rust/pull/26588
7944 [fb]: https://github.com/rust-lang/rust/pull/26959
7945 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7946 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7947 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7948 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7949 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7950 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7951 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7952 [lic]: https://github.com/rust-lang/rust/pull/26583
7953 [lnu]: https://github.com/rust-lang/rust/pull/27026
7954 [lr]: https://github.com/rust-lang/rust/issues/27248
7955 [lum]: https://github.com/rust-lang/rust/pull/26378
7956 [lur]: https://github.com/rust-lang/rust/pull/26783
7957 [nlp]: https://github.com/rust-lang/rust/pull/27176
7958 [nold2]: https://github.com/rust-lang/rust/pull/27045
7959 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7960 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7961 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7962 [pi]: https://github.com/rust-lang/rust/pull/26699
7963 [ps]: https://github.com/rust-lang/rust/pull/26884
7964 [rte]: https://github.com/rust-lang/rust/pull/26950
7965 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7966 [search]: https://github.com/rust-lang/rust/pull/26327
7967 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7968 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7969 [sh]: https://github.com/rust-lang/rust/pull/27280
7970 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7971 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7972 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7973 [st]: https://github.com/rust-lang/rust/pull/26630
7974 [win1]: https://github.com/rust-lang/rust/pull/26569
7975 [win2]: https://github.com/rust-lang/rust/pull/26741
7976 [win3]: https://github.com/rust-lang/rust/pull/26741
7977 [win4]: https://github.com/rust-lang/rust/pull/27210
7978 [xp]: https://github.com/rust-lang/rust/pull/26569
7980 Version 1.2.0 (2015-08-07)
7981 ==========================
7983 * ~1200 changes, numerous bugfixes
7988 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7989 like `Rc` to contain types without a fixed size, arrays and trait
7990 objects, finally enabling use of `Rc<[T]>` and completing the
7991 implementation of DST.
7992 * [Parallel codegen][parcodegen] is now working again, which can
7993 substantially speed up large builds in debug mode; It also gets
7994 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7995 jobs). It's not enabled by default, but will be "in the near
7996 future". It can be activated with the `-C codegen-units=N` flag to
7998 * This is the first release with [experimental support for linking
7999 with the MSVC linker and lib C on Windows (instead of using the GNU
8000 variants via MinGW)][win]. It is yet recommended only for the most
8001 intrepid Rustaceans.
8002 * Benchmark compilations are showing a 30% improvement in
8003 bootstrapping over 1.1.
8008 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8009 unicode case mapping, which is a previously-planned change in
8010 behavior and considered a bugfix.
8011 * [`mem::align_of`] now specifies [the *minimum alignment* for
8012 T][align], which is usually the alignment programs are interested
8013 in, and the same value reported by clang's
8014 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8016 * [The `#[packed]` attribute is no longer silently accepted by the
8017 compiler][packed]. This attribute did nothing and code that
8018 mentioned it likely did not work as intended.
8019 * Associated type defaults are [now behind the
8020 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8021 defaults *did not work*, but could be mentioned syntactically. As
8022 such this breakage has minimal impact.
8027 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8028 matching against dereferenceable values.
8033 * The [`Extend`] trait, which grows a collection from an iterator, is
8034 implemented over iterators of references, for `String`, `Vec`,
8035 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8036 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8037 * The [`iter::once`] function returns an iterator that yields a single
8038 element, and [`iter::empty`] returns an iterator that yields no
8040 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8041 over substring matches.
8042 * [`Cell`] and [`RefCell`] both implement `Eq`.
8043 * A number of methods for wrapping arithmetic are added to the
8044 integral types, [`wrapping_div`], [`wrapping_rem`],
8045 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8046 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8047 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8048 type.. It is illegal for the default arithmetic operations in Rust
8049 to overflow; the desire to wrap must be explicit.
8050 * The `{:#?}` formatting specifier [displays the alternate,
8051 pretty-printed][debugfmt] form of the `Debug` formatter. This
8052 feature was actually introduced prior to 1.0 with little
8054 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8055 for writing data to formatted strings, similar to [`io::Write`].
8056 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8057 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8058 are used by code generators to emit implementations of [`Debug`].
8059 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8060 methods that convert case, following Unicode case mapping.
8061 * It is now easier to handle poisoned locks. The [`PoisonError`]
8062 type, returned by failing lock operations, exposes `into_inner`,
8063 `get_ref`, and `get_mut`, which all give access to the inner lock
8064 guard, and allow the poisoned lock to continue to operate. The
8065 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8066 poisoned lock without attempting to take the lock.
8067 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8068 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8069 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8070 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8072 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8078 * `rustc` employs smarter heuristics for guessing at [typos].
8079 * `rustc` emits more efficient code for [no-op conversions between
8080 unsafe pointers][nop].
8081 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8082 resulting in faster compile times and smaller code.
8084 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8085 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8086 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8087 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8088 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8089 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8090 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8091 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8092 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8093 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8094 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8095 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8096 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8097 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8098 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8099 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8100 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8101 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8102 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8103 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8104 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8105 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8106 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8107 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8108 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8109 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8110 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8111 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8112 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8113 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8114 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8115 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8116 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8117 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8118 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8119 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8120 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8121 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8122 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8123 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8124 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8125 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8126 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8127 [align]: https://github.com/rust-lang/rust/pull/25646
8128 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8129 [typos]: https://github.com/rust-lang/rust/pull/26087
8130 [nop]: https://github.com/rust-lang/rust/pull/26336
8131 [fat]: https://github.com/rust-lang/rust/pull/26411
8132 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8133 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8134 [packed]: https://github.com/rust-lang/rust/pull/25541
8135 [ad]: https://github.com/rust-lang/rust/pull/27382
8136 [win]: https://github.com/rust-lang/rust/pull/25350
8138 Version 1.1.0 (2015-06-25)
8139 =========================
8141 * ~850 changes, numerous bugfixes
8146 * The [`std::fs` module has been expanded][fs] to expand the set of
8147 functionality exposed:
8148 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8149 don't incur a syscall on some platforms.
8150 * A `symlink_metadata` function has been added.
8151 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8152 access to all underlying information.
8153 * The compiler now contains extended explanations of many errors. When an error
8154 with an explanation occurs the compiler suggests using the `--explain` flag
8155 to read the explanation. Error explanations are also [available online][err-index].
8156 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8157 well as other work, the time to bootstrap the compiler decreased by
8163 * The [`str::split_whitespace`] method splits a string on unicode
8164 whitespace boundaries.
8165 * On both Windows and Unix, new extension traits provide conversion of
8166 I/O types to and from the underlying system handles. On Unix, these
8167 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8168 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8169 `TcpListener`, and `UpdSocket`. Further implementations for
8170 `std::process` will be stabilized later.
8171 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8172 Windows, symlinks can be created with
8173 `std::os::windows::symlink_dir` and
8174 `std::os::windows::symlink_file`.
8175 * The `mpsc::Receiver` type can now be converted into an iterator with
8176 `into_iter` on the [`IntoIterator`] trait.
8177 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8178 implementation of the [`From`] trait.
8179 * The `Debug` implementation for `RangeFull` [creates output that is
8180 more consistent with other implementations][rf].
8181 * [`Debug` is implemented for `File`][file].
8182 * The `Default` implementation for `Arc` [no longer requires `Sync +
8184 * [The `Iterator` methods `count`, `nth`, and `last` have been
8185 overridden for slices to have O(1) performance instead of O(n)][si].
8186 * Incorrect handling of paths on Windows has been improved in both the
8187 compiler and the standard library.
8188 * [`AtomicPtr` gained a `Default` implementation][ap].
8189 * In accordance with Rust's policy on arithmetic overflow `abs` now
8190 [panics on overflow when debug assertions are enabled][abs].
8191 * The [`Cloned`] iterator, which was accidentally left unstable for
8192 1.0 [has been stabilized][c].
8193 * The [`Incoming`] iterator, which iterates over incoming TCP
8194 connections, and which was accidentally unnamable in 1.0, [is now
8195 properly exported][inc].
8196 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8197 `sift_up` or `sift_down` panic][bh].
8198 * The [`split_off`] method of `LinkedList` [no longer corrupts
8199 the list in certain scenarios][ll].
8204 * Type checking performance [has improved notably][sk] with
8205 [multiple improvements][pre].
8206 * The compiler [suggests code changes][ch] for more errors.
8207 * rustc and it's build system have experimental support for [building
8208 toolchains against MUSL][m] instead of glibc on Linux.
8209 * The compiler defines the `target_env` cfg value, which is used for
8210 distinguishing toolchains that are otherwise for the same
8211 platform. Presently this is set to `gnu` for common GNU Linux
8212 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8213 * The [`cargo rustc`][crc] command invokes a build with custom flags
8215 * [Android executables are always position independent][pie].
8216 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8219 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8220 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8221 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8222 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8223 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8224 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8225 [rf]: https://github.com/rust-lang/rust/pull/24491
8226 [err-index]: https://doc.rust-lang.org/error-index.html
8227 [sk]: https://github.com/rust-lang/rust/pull/24615
8228 [pre]: https://github.com/rust-lang/rust/pull/25323
8229 [file]: https://github.com/rust-lang/rust/pull/24598
8230 [ch]: https://github.com/rust-lang/rust/pull/24683
8231 [arc]: https://github.com/rust-lang/rust/pull/24695
8232 [si]: https://github.com/rust-lang/rust/pull/24701
8233 [ap]: https://github.com/rust-lang/rust/pull/24834
8234 [m]: https://github.com/rust-lang/rust/pull/24777
8235 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8236 [crc]: https://github.com/rust-lang/cargo/pull/1568
8237 [pie]: https://github.com/rust-lang/rust/pull/24953
8238 [abs]: https://github.com/rust-lang/rust/pull/25441
8239 [c]: https://github.com/rust-lang/rust/pull/25496
8240 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8241 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8242 [inc]: https://github.com/rust-lang/rust/pull/25522
8243 [bh]: https://github.com/rust-lang/rust/pull/25856
8244 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8245 [ll]: https://github.com/rust-lang/rust/pull/26022
8246 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8247 [drop]: https://github.com/rust-lang/rust/pull/24935
8249 Version 1.0.0 (2015-05-15)
8250 ========================
8252 * ~1500 changes, numerous bugfixes
8257 * The vast majority of the standard library is now `#[stable]`. It is
8258 no longer possible to use unstable features with a stable build of
8260 * Many popular crates on [crates.io] now work on the stable release
8262 * Arithmetic on basic integer types now [checks for overflow in debug
8268 * Several [restrictions have been added to trait coherence][coh] in
8269 order to make it easier for upstream authors to change traits
8270 without breaking downstream code.
8271 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8272 improve error messages and macro behavior. For example, `0b1234` is
8273 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8274 * Trait bounds [are always invariant][inv], eliminating the need for
8275 the `PhantomFn` and `MarkerTrait` lang items, which have been
8277 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8278 "foo" as bar` syntax has been replaced with `extern crate foo as
8279 bar`, and Cargo now automatically translates "-" in *package* names
8280 to underscore for the crate name.
8281 * [Lifetime shadowing is an error][lt].
8282 * [`Send` no longer implies `'static`][send-rfc].
8283 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8284 `MyType::default()`.
8285 * Primitive types [now have inherent methods][prim-inherent],
8286 obviating the need for extension traits like `SliceExt`.
8287 * Methods with `Self: Sized` in their `where` clause are [considered
8288 object-safe][self-sized], allowing many extension traits like
8289 `IteratorExt` to be merged into the traits they extended.
8290 * You can now [refer to associated types][assoc-where] whose
8291 corresponding trait bounds appear only in a `where` clause.
8292 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8293 like `Send` and `Sync` are now library-defined.
8294 * A [Reflect trait][reflect] was introduced, which means that
8295 downcasting via the `Any` trait is effectively limited to concrete
8296 types. This helps retain the potentially-important "parametricity"
8297 property: generic code cannot behave differently for different type
8298 arguments except in minor ways.
8299 * The `unsafe_destructor` feature is now deprecated in favor of the
8300 [new `dropck`][dropck]. This change is a major reduction in unsafe
8306 * The `thread_local` module [has been renamed to `std::thread`][th].
8307 * The methods of `IteratorExt` [have been moved to the `Iterator`
8309 * Several traits that implement Rust's conventions for type
8310 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8311 [centralized in the `std::convert` module][con].
8312 * The `FromError` trait [was removed in favor of `From`][fe].
8313 * The basic sleep function [has moved to
8314 `std::thread::sleep_ms`][slp].
8315 * The `splitn` function now takes an `n` parameter that represents the
8316 number of items yielded by the returned iterator [instead of the
8317 number of 'splits'][spl].
8318 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8319 * [Derived implementations of `PartialOrd` now order enums according
8320 to their explicitly-assigned discriminants][po].
8321 * [Methods for searching strings are generic over `Pattern`s][pat],
8322 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8324 * [In method resolution, object methods are resolved before inherent
8326 * [`String::from_str` has been deprecated in favor of the `From` impl,
8327 `String::from`][sf].
8328 * [`io::Error` implements `Sync`][ios].
8329 * [The `words` method on `&str` has been replaced with
8330 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8332 * The new path and IO modules are complete and `#[stable]`. This
8333 was the major library focus for this cycle.
8334 * The path API was [revised][path-normalize] to normalize `.`,
8335 adjusting the tradeoffs in favor of the most common usage.
8336 * A large number of remaining APIs in `std` were also stabilized
8337 during this cycle; about 75% of the non-deprecated API surface
8339 * The new [string pattern API][string-pattern] landed, which makes
8340 the string slice API much more internally consistent and flexible.
8341 * A new set of [generic conversion traits][conversion] replaced
8342 many existing ad hoc traits.
8343 * Generic numeric traits were [completely removed][num-traits]. This
8344 was made possible thanks to inherent methods for primitive types,
8345 and the removal gives maximal flexibility for designing a numeric
8346 hierarchy in the future.
8347 * The `Fn` traits are now related via [inheritance][fn-inherit]
8348 and provide ergonomic [blanket implementations][fn-blanket].
8349 * The `Index` and `IndexMut` traits were changed to
8350 [take the index by value][index-value], enabling code like
8351 `hash_map["string"]` to work.
8352 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8353 `Copy` data is known to be `Clone` as well.
8358 * Many errors now have extended explanations that can be accessed with
8359 the `--explain` flag to `rustc`.
8360 * Many new examples have been added to the standard library
8362 * rustdoc has received a number of improvements focused on completion
8364 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8365 * Much headway was made on ecosystem-wide CI, making it possible
8366 to [compare builds for breakage][ci-compare].
8369 [crates.io]: http://crates.io
8370 [clo]: https://github.com/rust-lang/rust/pull/24034
8371 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8372 [con]: https://github.com/rust-lang/rust/pull/23875
8373 [cr]: https://github.com/rust-lang/rust/pull/23419
8374 [fe]: https://github.com/rust-lang/rust/pull/23879
8375 [ie]: https://github.com/rust-lang/rust/pull/23300
8376 [inv]: https://github.com/rust-lang/rust/pull/23938
8377 [ios]: https://github.com/rust-lang/rust/pull/24133
8378 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8379 [lt]: https://github.com/rust-lang/rust/pull/24057
8380 [meth]: https://github.com/rust-lang/rust/pull/24056
8381 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8382 [po]: https://github.com/rust-lang/rust/pull/24270
8383 [sf]: https://github.com/rust-lang/rust/pull/24517
8384 [slp]: https://github.com/rust-lang/rust/pull/23949
8385 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8386 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8387 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8388 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8389 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8390 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8391 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8392 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8393 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8394 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8395 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8396 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8397 [reflect]: https://github.com/rust-lang/rust/pull/23712
8398 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8399 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8400 [index-value]: https://github.com/rust-lang/rust/pull/23601
8401 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8402 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8403 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8404 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8405 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8406 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8409 Version 1.0.0-alpha.2 (2015-02-20)
8410 =====================================
8412 * ~1300 changes, numerous bugfixes
8416 * The various I/O modules were [overhauled][io-rfc] to reduce
8417 unnecessary abstractions and provide better interoperation with
8418 the underlying platform. The old `io` module remains temporarily
8420 * The standard library now [participates in feature gating][feat],
8421 so use of unstable libraries now requires a `#![feature(...)]`
8422 attribute. The impact of this change is [described on the
8423 forum][feat-forum]. [RFC][feat-rfc].
8427 * `for` loops [now operate on the `IntoIterator` trait][into],
8428 which eliminates the need to call `.iter()`, etc. to iterate
8429 over collections. There are some new subtleties to remember
8430 though regarding what sort of iterators various types yield, in
8431 particular that `for foo in bar { }` yields values from a move
8432 iterator, destroying the original collection. [RFC][into-rfc].
8433 * Objects now have [default lifetime bounds][obj], so you don't
8434 have to write `Box<Trait+'static>` when you don't care about
8435 storing references. [RFC][obj-rfc].
8436 * In types that implement `Drop`, [lifetimes must outlive the
8437 value][drop]. This will soon make it possible to safely
8438 implement `Drop` for types where `#[unsafe_destructor]` is now
8439 required. Read the [gorgeous RFC][drop-rfc] for details.
8440 * The fully qualified <T as Trait>::X syntax lets you set the Self
8441 type for a trait method or associated type. [RFC][ufcs-rfc].
8442 * References to types that implement `Deref<U>` now [automatically
8443 coerce to references][deref] to the dereferenced type `U`,
8444 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8445 should eliminate many unsightly uses of `&*`, as when converting
8446 from references to vectors into references to
8447 slices. [RFC][deref-rfc].
8448 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8449 `|:|`) is obsolete and closure kind is inferred from context.
8450 * [`Self` is a keyword][Self].
8454 * The `Show` and `String` formatting traits [have been
8455 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8456 their related purposes. Automatically getting a string
8457 conversion to use with `format!("{:?}", something_to_debug)` is
8458 now written `#[derive(Debug)]`.
8459 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8460 OsStr}`, provide strings in platform-specific encodings for easier
8461 interop with system APIs. [RFC][osstr-rfc].
8462 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8463 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8464 creating raw pointers.
8468 * Certain long error messages of the form 'expected foo found bar'
8469 are now [split neatly across multiple
8470 lines][multiline]. Examples in the PR.
8471 * On Unix Rust can be [uninstalled][un] by running
8472 `/usr/local/lib/rustlib/uninstall.sh`.
8473 * The `#[rustc_on_unimplemented]` attribute, requiring the
8474 'on_unimplemented' feature, lets rustc [display custom error
8475 messages when a trait is expected to be implemented for a type
8480 * Rust is tested against a [LALR grammar][lalr], which parses
8481 almost all the Rust files that rustc does.
8483 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8484 [close]: https://github.com/rust-lang/rust/pull/21843
8485 [deref]: https://github.com/rust-lang/rust/pull/21351
8486 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8487 [drop]: https://github.com/rust-lang/rust/pull/21972
8488 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8489 [feat]: https://github.com/rust-lang/rust/pull/21248
8490 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8491 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8492 [fmt]: https://github.com/rust-lang/rust/pull/21457
8493 [into]: https://github.com/rust-lang/rust/pull/20790
8494 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8495 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8496 [lalr]: https://github.com/rust-lang/rust/pull/21452
8497 [multiline]: https://github.com/rust-lang/rust/pull/19870
8498 [obj]: https://github.com/rust-lang/rust/pull/22230
8499 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8500 [onun]: https://github.com/rust-lang/rust/pull/20889
8501 [osstr]: https://github.com/rust-lang/rust/pull/21488
8502 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8503 [Self]: https://github.com/rust-lang/rust/pull/22158
8504 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8505 [un]: https://github.com/rust-lang/rust/pull/22256
8508 Version 1.0.0-alpha (2015-01-09)
8509 ==================================
8511 * ~2400 changes, numerous bugfixes
8515 * The language itself is considered feature complete for 1.0,
8516 though there will be many usability improvements and bugfixes
8517 before the final release.
8518 * Nearly 50% of the public API surface of the standard library has
8519 been declared 'stable'. Those interfaces are unlikely to change
8521 * The long-running debate over integer types has been
8522 [settled][ints]: Rust will ship with types named `isize` and
8523 `usize`, rather than `int` and `uint`, for pointer-sized
8524 integers. Guidelines will be rolled out during the alpha cycle.
8525 * Most crates that are not `std` have been moved out of the Rust
8526 distribution into the Cargo ecosystem so they can evolve
8527 separately and don't need to be stabilized as quickly, including
8528 'time', 'getopts', 'num', 'regex', and 'term'.
8529 * Documentation continues to be expanded with more API coverage, more
8530 examples, and more in-depth explanations. The guides have been
8531 consolidated into [The Rust Programming Language][trpl].
8532 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8533 * All official Rust binary installers now come with [Cargo], the
8534 Rust package manager.
8538 * Closures have been [completely redesigned][unboxed] to be
8539 implemented in terms of traits, can now be used as generic type
8540 bounds and thus monomorphized and inlined, or via an opaque
8541 pointer (boxed) as in the old system. The new system is often
8542 referred to as 'unboxed' closures.
8543 * Traits now support [associated types][assoc], allowing families
8544 of related types to be defined together and used generically in
8546 * Enum variants are [namespaced by their type names][enum].
8547 * [`where` clauses][where] provide a more versatile and attractive
8548 syntax for specifying generic bounds, though the previous syntax
8550 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8552 * Rust [no longer has a runtime][rt] of any description, and only
8553 supports OS threads, not green threads.
8554 * At long last, Rust has been overhauled for 'dynamically-sized
8555 types' ([DST]), which integrates 'fat pointers' (object types,
8556 arrays, and `str`) more deeply into the type system, making it
8558 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8559 `..j` that produce range types and which, when combined with the
8560 `Index` operator and multidispatch, leads to a convenient slice
8562 * The new range syntax revealed an ambiguity in the fixed-length
8563 array syntax, so now fixed length arrays [are written `[T;
8565 * The `Copy` trait is no longer implemented automatically. Unsafe
8566 pointers no longer implement `Sync` and `Send` so types
8567 containing them don't automatically either. `Sync` and `Send`
8568 are now 'unsafe traits' so one can "forcibly" implement them via
8569 `unsafe impl` if a type confirms to the requirements for them
8570 even though the internals do not (e.g. structs containing unsafe
8571 pointers like `Arc`). These changes are intended to prevent some
8572 footguns and are collectively known as [opt-in built-in
8573 traits][oibit] (though `Sync` and `Send` will soon become pure
8574 library types unknown to the compiler).
8575 * Operator traits now take their operands [by value][ops], and
8576 comparison traits can use multidispatch to compare one type
8577 against multiple other types, allowing e.g. `String` to be
8578 compared with `&str`.
8579 * `if let` and `while let` are no longer feature-gated.
8580 * Rust has adopted a more [uniform syntax for escaping unicode
8581 characters][unicode].
8582 * `macro_rules!` [has been declared stable][mac]. Though it is a
8583 flawed system it is sufficiently popular that it must be usable
8584 for 1.0. Effort has gone into [future-proofing][mac-future] it
8585 in ways that will allow other macro systems to be developed in
8586 parallel, and won't otherwise impact the evolution of the
8588 * The prelude has been [pared back significantly][prelude] such
8589 that it is the minimum necessary to support the most pervasive
8590 code patterns, and through [generalized where clauses][where]
8591 many of the prelude extension traits have been consolidated.
8592 * Rust's rudimentary reflection [has been removed][refl], as it
8593 incurred too much code generation for little benefit.
8594 * [Struct variants][structvars] are no longer feature-gated.
8595 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8596 known as 'higher-ranked trait bounds', this crucially allows
8597 unboxed closures to work.
8598 * Macros invocations surrounded by parens or square brackets and
8599 not terminated by a semicolon are [parsed as
8600 expressions][macros], which makes expressions like `vec![1i32,
8601 2, 3].len()` work as expected.
8602 * Trait objects now implement their traits automatically, and
8603 traits that can be coerced to objects now must be [object
8605 * Automatically deriving traits is now done with `#[derive(...)]`
8606 not `#[deriving(...)]` for [consistency with other naming
8607 conventions][derive].
8608 * Importing the containing module or enum at the same time as
8609 items or variants they contain is [now done with `self` instead
8610 of `mod`][self], as in use `foo::{self, bar}`
8611 * Glob imports are no longer feature-gated.
8612 * The `box` operator and `box` patterns have been feature-gated
8613 pending a redesign. For now unique boxes should be allocated
8614 like other containers, with `Box::new`.
8618 * A [series][coll1] of [efforts][coll2] to establish
8619 [conventions][coll3] for collections types has resulted in API
8620 improvements throughout the standard library.
8621 * New [APIs for error handling][err] provide ergonomic interop
8622 between error types, and [new conventions][err-conv] describe
8623 more clearly the recommended error handling strategies in Rust.
8624 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8625 it is easier to discuss failure in the context of error handling
8626 without making clarifications as to whether you are referring to
8627 the 'fail' macro or failure more generally.
8628 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8629 syscall when available.
8630 * The 'serialize' crate has been renamed 'rustc-serialize' and
8631 moved out of the distribution to Cargo. Although it is widely
8632 used now, it is expected to be superseded in the near future.
8633 * The `Show` formatter, typically implemented with
8634 `#[derive(Show)]` is [now requested with the `{:?}`
8635 specifier][show] and is intended for use by all types, for uses
8636 such as `println!` debugging. The new `String` formatter must be
8637 implemented by hand, uses the `{}` specifier, and is intended
8638 for full-fidelity conversions of things that can logically be
8639 represented as strings.
8643 * [Flexible target specification][flex] allows rustc's code
8644 generation to be configured to support otherwise-unsupported
8646 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8647 respective debuggers with Rust-appropriate pretty-printing.
8648 * The Windows installation of Rust is distributed with the
8649 MinGW components currently required to link binaries on that
8654 * Nullable enum optimizations have been extended to more types so
8655 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8656 space than the inner types themselves.
8657 * Work has begun on supporting AArch64.
8659 [Cargo]: https://crates.io
8660 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8661 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8662 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8663 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8664 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8665 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8666 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8667 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8668 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8669 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8670 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8671 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8672 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8673 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8674 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8675 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8676 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8677 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8678 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8679 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8680 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8681 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8682 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8683 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8684 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8685 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8686 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8687 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8688 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8689 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8690 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8691 [trpl]: https://doc.rust-lang.org/book/index.html
8692 [rbe]: http://rustbyexample.com/
8695 Version 0.12.0 (2014-10-09)
8696 =============================
8698 * ~1900 changes, numerous bugfixes
8702 * The introductory documentation (now called The Rust Guide) has
8703 been completely rewritten, as have a number of supplementary
8705 * Rust's package manager, Cargo, continues to improve and is
8706 sometimes considered to be quite awesome.
8707 * Many API's in `std` have been reviewed and updated for
8708 consistency with the in-development Rust coding
8709 guidelines. The standard library documentation tracks
8710 stabilization progress.
8711 * Minor libraries have been moved out-of-tree to the rust-lang org
8712 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8713 be installed with Cargo.
8714 * Lifetime elision allows lifetime annotations to be left off of
8715 function declarations in many common scenarios.
8716 * Rust now works on 64-bit Windows.
8719 * Indexing can be overloaded with the `Index` and `IndexMut`
8721 * The `if let` construct takes a branch only if the `let` pattern
8722 matches, currently behind the 'if_let' feature gate.
8723 * 'where clauses', a more flexible syntax for specifying trait
8724 bounds that is more aesthetic, have been added for traits and
8725 free functions. Where clauses will in the future make it
8726 possible to constrain associated types, which would be
8727 impossible with the existing syntax.
8728 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8729 the 'slicing_syntax' feature gate, and can be overloaded with
8730 the `Slice` or `SliceMut` traits.
8731 * The syntax for matching of sub-slices has been changed to use a
8732 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8733 consistency with other uses of `..` and to future-proof
8734 potential additional uses of the syntax.
8735 * The syntax for matching inclusive ranges in patterns has changed
8736 from `0..3` to `0...4` to be consistent with the exclusive range
8738 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8739 c]`) has been put behind the 'advanced_slice_patterns' feature
8740 gate and may be removed in the future.
8741 * Components of tuples and tuple structs can be extracted using
8742 the `value.0` syntax, currently behind the `tuple_indexing`
8744 * The `#[crate_id]` attribute is no longer supported; versioning
8745 is handled by the package manager.
8746 * Renaming crate imports are now written `extern crate foo as bar`
8747 instead of `extern crate bar = foo`.
8748 * Renaming use statements are now written `use foo as bar` instead
8750 * `let` and `match` bindings and argument names in macros are now
8752 * The new, more efficient, closure types ('unboxed closures') have
8753 been added under a feature gate, 'unboxed_closures'. These will
8754 soon replace the existing closure types, once higher-ranked
8755 trait lifetimes are added to the language.
8756 * `move` has been added as a keyword, for indicating closures
8757 that capture by value.
8758 * Mutation and assignment is no longer allowed in pattern guards.
8759 * Generic structs and enums can now have trait bounds.
8760 * The `Share` trait is now called `Sync` to free up the term
8761 'shared' to refer to 'shared reference' (the default reference
8763 * Dynamically-sized types have been mostly implemented,
8764 unifying the behavior of fat-pointer types with the rest of the
8766 * As part of dynamically-sized types, the `Sized` trait has been
8767 introduced, which qualifying types implement by default, and
8768 which type parameters expect by default. To specify that a type
8769 parameter does not need to be sized, write `<Sized? T>`. Most
8770 types are `Sized`, notable exceptions being unsized arrays
8771 (`[T]`) and trait types.
8772 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8773 * Lifetime bounds can now be applied to type parameters and object
8775 * The old, reference counted GC type, `Gc<T>` which was once
8776 denoted by the `@` sigil, has finally been removed. GC will be
8777 revisited in the future.
8780 * Library documentation has been improved for a number of modules.
8781 * Bit-vectors, collections::bitv has been modernized.
8782 * The url crate is deprecated in favor of
8783 http://github.com/servo/rust-url, which can be installed with
8785 * Most I/O stream types can be cloned and subsequently closed from
8787 * A `std::time::Duration` type has been added for use in I/O
8788 methods that rely on timers, as well as in the 'time' crate's
8789 `Timespec` arithmetic.
8790 * The runtime I/O abstraction layer that enabled the green thread
8791 scheduler to do non-thread-blocking I/O has been removed, along
8792 with the libuv-based implementation employed by the green thread
8793 scheduler. This will greatly simplify the future I/O work.
8794 * `collections::btree` has been rewritten to have a more
8795 idiomatic and efficient design.
8798 * rustdoc output now indicates the stability levels of API's.
8799 * The `--crate-name` flag can specify the name of the crate
8800 being compiled, like `#[crate_name]`.
8801 * The `-C metadata` specifies additional metadata to hash into
8802 symbol names, and `-C extra-filename` specifies additional
8803 information to put into the output filename, for use by the
8804 package manager for versioning.
8805 * debug info generation has continued to improve and should be
8806 more reliable under both gdb and lldb.
8807 * rustc has experimental support for compiling in parallel
8808 using the `-C codegen-units` flag.
8809 * rustc no longer encodes rpath information into binaries by
8813 * Stack usage has been optimized with LLVM lifetime annotations.
8814 * Official Rust binaries on Linux are more compatible with older
8815 kernels and distributions, built on CentOS 5.10.
8818 Version 0.11.0 (2014-07-02)
8819 ==========================
8821 * ~1700 changes, numerous bugfixes
8824 * ~[T] has been removed from the language. This type is superseded by
8826 * ~str has been removed from the language. This type is superseded by
8828 * ~T has been removed from the language. This type is superseded by the
8830 * @T has been removed from the language. This type is superseded by the
8831 standard library's std::gc::Gc<T> type.
8832 * Struct fields are now all private by default.
8833 * Vector indices and shift amounts are both required to be a `uint`
8834 instead of any integral type.
8835 * Byte character, byte string, and raw byte string literals are now all
8836 supported by prefixing the normal literal with a `b`.
8837 * Multiple ABIs are no longer allowed in an ABI string
8838 * The syntax for lifetimes on closures/procedures has been tweaked
8839 slightly: `<'a>|A, B|: 'b + K -> T`
8840 * Floating point modulus has been removed from the language; however it
8841 is still provided by a library implementation.
8842 * Private enum variants are now disallowed.
8843 * The `priv` keyword has been removed from the language.
8844 * A closure can no longer be invoked through a &-pointer.
8845 * The `use foo, bar, baz;` syntax has been removed from the language.
8846 * The transmute intrinsic no longer works on type parameters.
8847 * Statics now allow blocks/items in their definition.
8848 * Trait bounds are separated from objects with + instead of : now.
8849 * Objects can no longer be read while they are mutably borrowed.
8850 * The address of a static is now marked as insignificant unless the
8851 #[inline(never)] attribute is placed it.
8852 * The #[unsafe_destructor] attribute is now behind a feature gate.
8853 * Struct literals are no longer allowed in ambiguous positions such as
8854 if, while, match, and for..in.
8855 * Declaration of lang items and intrinsics are now feature-gated by
8857 * Integral literals no longer default to `int`, and floating point
8858 literals no longer default to `f64`. Literals must be suffixed with an
8859 appropriate type if inference cannot determine the type of the
8861 * The Box<T> type is no longer implicitly borrowed to &mut T.
8862 * Procedures are now required to not capture borrowed references.
8865 * The standard library is now a "facade" over a number of underlying
8866 libraries. This means that development on the standard library should
8867 be speedier due to smaller crates, as well as a clearer line between
8869 * A new library, libcore, lives under the standard library's facade
8870 which is Rust's "0-assumption" library, suitable for embedded and
8871 kernel development for example.
8872 * A regex crate has been added to the standard distribution. This crate
8873 includes statically compiled regular expressions.
8874 * The unwrap/unwrap_err methods on Result require a Show bound for
8875 better error messages.
8876 * The return types of the std::comm primitives have been centralized
8877 around the Result type.
8878 * A number of I/O primitives have gained the ability to time out their
8880 * A number of I/O primitives have gained the ability to close their
8881 reading/writing halves to cancel pending operations.
8882 * Reverse iterator methods have been removed in favor of `rev()` on
8883 their forward-iteration counterparts.
8884 * A bitflags! macro has been added to enable easy interop with C and
8885 management of bit flags.
8886 * A debug_assert! macro is now provided which is disabled when
8887 `--cfg ndebug` is passed to the compiler.
8888 * A graphviz crate has been added for creating .dot files.
8889 * The std::cast module has been migrated into std::mem.
8890 * The std::local_data api has been migrated from freestanding functions
8891 to being based on methods.
8892 * The Pod trait has been renamed to Copy.
8893 * jemalloc has been added as the default allocator for types.
8894 * The API for allocating memory has been changed to use proper alignment
8895 and sized deallocation
8896 * Connecting a TcpStream or binding a TcpListener is now based on a
8897 string address and a u16 port. This allows connecting to a hostname as
8899 * The Reader trait now contains a core method, read_at_least(), which
8900 correctly handles many repeated 0-length reads.
8901 * The process-spawning API is now centered around a builder-style
8903 * The :? printing qualifier has been moved from the standard library to
8904 an external libdebug crate.
8905 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8906 have been renamed to Eq/Ord.
8907 * The select/plural methods have been removed from format!. The escapes
8908 for { and } have also changed from \{ and \} to {{ and }},
8910 * The TaskBuilder API has been re-worked to be a true builder, and
8911 extension traits for spawning native/green tasks have been added.
8914 * All breaking changes to the language or libraries now have their
8915 commit message annotated with `[breaking-change]` to allow for easy
8916 discovery of breaking changes.
8917 * The compiler will now try to suggest how to annotate lifetimes if a
8918 lifetime-related error occurs.
8919 * Debug info continues to be improved greatly with general bug fixes and
8920 better support for situations like link time optimization (LTO).
8921 * Usage of syntax extensions when cross-compiling has been fixed.
8922 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8923 -fdata-sections and --gc-sections has been enabled by default
8924 * The compiler is now stricter about where it will load module files
8925 from when a module is declared via `mod foo;`.
8926 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8927 Syntax extensions are now discovered via a "plugin registrar" type
8928 which will be extended in the future to other various plugins.
8929 * Lints have been restructured to allow for dynamically loadable lints.
8930 * A number of rustdoc improvements:
8931 * The HTML output has been visually redesigned.
8932 * Markdown is now powered by hoedown instead of sundown.
8933 * Searching heuristics have been greatly improved.
8934 * The search index has been reduced in size by a great amount.
8935 * Cross-crate documentation via `pub use` has been greatly improved.
8936 * Primitive types are now hyperlinked and documented.
8937 * Documentation has been moved from static.rust-lang.org/doc to
8939 * A new sandbox, play.rust-lang.org, is available for running and
8940 sharing rust code examples on-line.
8941 * Unused attributes are now more robustly warned about.
8942 * The dead_code lint now warns about unused struct fields.
8943 * Cross-compiling to iOS is now supported.
8944 * Cross-compiling to mipsel is now supported.
8945 * Stability attributes are now inherited by default and no longer apply
8946 to intra-crate usage, only inter-crate usage.
8947 * Error message related to non-exhaustive match expressions have been
8951 Version 0.10 (2014-04-03)
8952 =========================
8954 * ~1500 changes, numerous bugfixes
8957 * A new RFC process is now in place for modifying the language.
8958 * Patterns with `@`-pointers have been removed from the language.
8959 * Patterns with unique vectors (`~[T]`) have been removed from the
8961 * Patterns with unique strings (`~str`) have been removed from the
8963 * `@str` has been removed from the language.
8964 * `@[T]` has been removed from the language.
8965 * `@self` has been removed from the language.
8966 * `@Trait` has been removed from the language.
8967 * Headers on `~` allocations which contain `@` boxes inside the type for
8968 reference counting have been removed.
8969 * The semantics around the lifetimes of temporary expressions have changed,
8970 see #3511 and #11585 for more information.
8971 * Cross-crate syntax extensions are now possible, but feature gated. See
8972 #11151 for more information. This includes both `macro_rules!` macros as
8973 well as syntax extensions such as `format!`.
8974 * New lint modes have been added, and older ones have been turned on to be
8976 * Unnecessary parentheses
8979 * Uppercase variables
8980 * Publicly visible private types
8981 * `#[deriving]` with raw pointers
8982 * Unsafe functions can no longer be coerced to closures.
8983 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8984 * The `#[simd]` attribute is now behind a feature gate.
8985 * Visibility is no longer allowed on `extern crate` statements, and
8986 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8987 * Trailing commas are now allowed in argument lists and tuple patterns.
8988 * The `do` keyword has been removed, it is now a reserved keyword.
8989 * Default type parameters have been implemented, but are feature gated.
8990 * Borrowed variables through captures in closures are now considered soundly.
8991 * `extern mod` is now `extern crate`
8992 * The `Freeze` trait has been removed.
8993 * The `Share` trait has been added for types that can be shared among
8995 * Labels in macros are now hygienic.
8996 * Expression/statement macro invocations can be delimited with `{}` now.
8997 * Treatment of types allowed in `static mut` locations has been tweaked.
8998 * The `*` and `.` operators are now overloadable through the `Deref` and
9000 * `~Trait` and `proc` no longer have `Send` bounds by default.
9001 * Partial type hints are now supported with the `_` type marker.
9002 * An `Unsafe` type was introduced for interior mutability. It is now
9003 considered undefined to transmute from `&T` to `&mut T` without using the
9005 * The #[linkage] attribute was implemented for extern statics/functions.
9006 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9007 * `Pod` was renamed to `Copy`.
9010 * The `libextra` library has been removed. It has now been decomposed into
9011 component libraries with smaller and more focused nuggets of
9012 functionality. The full list of libraries can be found on the
9013 documentation index page.
9014 * std: `std::condition` has been removed. All I/O errors are now propagated
9015 through the `Result` type. In order to assist with error handling, a
9016 `try!` macro for unwrapping errors with an early return and a lint for
9017 unused results has been added. See #12039 for more information.
9018 * std: The `vec` module has been renamed to `slice`.
9019 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9020 This will become the only growable vector in the future.
9021 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9022 are now found at `std::io::BufferedReader` instead of
9023 `std::io::buffered::BufferedReader`.
9024 * std: `print` and `println` are no longer in the prelude, the `print!` and
9025 `println!` macros are intended to be used instead.
9026 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9027 attempts to statically prevent cycles.
9028 * std: The standard distribution is adopting the policy of pushing failure
9029 to the user rather than failing in libraries. Many functions (such as
9030 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9031 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9032 deriving mode: `#[deriving(Show)]`.
9033 * std: `ToStr` is now implemented for all types implementing `Show`.
9034 * std: The formatting trait methods now take `&self` instead of `&T`
9035 * std: The `invert()` method on iterators has been renamed to `rev()`
9036 * std: `std::num` has seen a reduction in the genericity of its traits,
9037 consolidating functionality into a few core traits.
9038 * std: Backtraces are now printed on task failure if the environment
9039 variable `RUST_BACKTRACE` is present.
9040 * std: Naming conventions for iterators have been standardized. More details
9041 can be found on the wiki's style guide.
9042 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9043 still implement the function.
9044 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9045 * std: `assert_approx_eq!` has been removed
9046 * std: The `e` and `E` formatting specifiers for floats have been added to
9047 print them in exponential notation.
9048 * std: The `Times` trait has been removed
9049 * std: Indications of variance and opting out of builtin bounds is done
9050 through marker types in `std::kinds::marker` now
9051 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9052 `#[deriving(Hash)]` is now possible.
9053 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9054 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9055 * std: `Chan::new` is now `channel()`.
9056 * std: A new synchronous channel type has been implemented.
9057 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9058 * std: `hashmap` and `trie` have been moved to `libcollections`
9059 * std: `run` has been rolled into `io::process`
9060 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9061 * std: The equality and comparison traits have seen some reorganization.
9062 * std: `rand` has moved to `librand`.
9063 * std: `to_{lower,upper}case` has been implemented for `char`.
9064 * std: Logging has been moved to `liblog`.
9065 * collections: `HashMap` has been rewritten for higher performance and less
9067 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9068 it can be booted manually. The runtime guide has more information and
9070 * native: All I/O functionality except signals has been implemented.
9071 * green: Task spawning with `libgreen` has been optimized with stack caching
9072 and various trimming of code.
9073 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9074 * sync: The `extra::sync` module has been updated to modern rust (and moved
9075 to the `sync` library), tweaking and improving various interfaces while
9076 dropping redundant functionality.
9077 * sync: A new `Barrier` type has been added to the `sync` library.
9078 * sync: An efficient mutex for native and green tasks has been implemented.
9079 * serialize: The `base64` module has seen some improvement. It treats
9080 newlines better, has non-string error values, and has seen general
9082 * fourcc: A `fourcc!` macro was introduced
9083 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9084 hexadecimal literal.
9087 * `rustpkg` has been deprecated and removed from the main repository. Its
9088 replacement, `cargo`, is under development.
9089 * Nightly builds of rust are now available
9090 * The memory usage of rustc has been improved many times throughout this
9092 * The build process supports disabling rpath support for the rustc binary
9094 * Code generation has improved in some cases, giving more information to the
9095 LLVM optimization passes to enable more extensive optimizations.
9096 * Debuginfo compatibility with lldb on OSX has been restored.
9097 * The master branch is now gated on an android bot, making building for
9098 android much more reliable.
9099 * Output flags have been centralized into one `--emit` flag.
9100 * Crate type flags have been centralized into one `--crate-type` flag.
9101 * Codegen flags have been consolidated behind a `-C` flag.
9102 * Linking against outdated crates now has improved error messages.
9103 * Error messages with lifetimes will often suggest how to annotate the
9104 function to fix the error.
9105 * Many more types are documented in the standard library, and new guides
9107 * Many `rustdoc` improvements:
9108 * code blocks are syntax highlighted.
9109 * render standalone markdown files.
9110 * the --test flag tests all code blocks by default.
9111 * exported macros are displayed.
9112 * re-exported types have their documentation inlined at the location of the
9114 * search works across crates that have been rendered to the same output
9118 Version 0.9 (2014-01-09)
9119 ==========================
9121 * ~1800 changes, numerous bugfixes
9124 * The `float` type has been removed. Use `f32` or `f64` instead.
9125 * A new facility for enabling experimental features (feature gating) has
9126 been added, using the crate-level `#[feature(foo)]` attribute.
9127 * Managed boxes (@) are now behind a feature gate
9128 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9129 standard library's `Gc` or `Rc` types instead.
9130 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9131 * Jumping back to the top of a loop is now done with `continue` instead of
9133 * Strings can no longer be mutated through index assignment.
9134 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9135 hash delimiters, as in `r###"foo"###`.
9136 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9138 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9139 * `@fn`s have been removed.
9140 * `do` only works with procs in order to make it obvious what the cost
9142 * Single-element tuple-like structs can no longer be dereferenced to
9143 obtain the inner value. A more comprehensive solution for overloading
9144 the dereference operator will be provided in the future.
9145 * The `#[link(...)]` attribute has been replaced with
9146 `#[crate_id = "name#vers"]`.
9147 * Empty `impl`s must be terminated with empty braces and may not be
9148 terminated with a semicolon.
9149 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9150 no longer has any special meaning.
9151 * The old `fmt!` string formatting macro has been removed.
9152 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9153 `print!` and `println!`.
9154 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9155 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9156 `extern mod foo = "bar"` instead.
9157 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9158 * Macros can have attributes.
9159 * Macros can expand to items with attributes.
9160 * Macros can expand to multiple items.
9161 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9162 * Comments may be nested.
9163 * Values automatically coerce to trait objects they implement, without
9165 * Enum discriminants are no longer an entire word but as small as needed to
9166 contain all the variants. The `repr` attribute can be used to override
9167 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9168 `#[repr(C)]` to match C enums.
9169 * Non-string literals are not allowed in attributes (they never worked).
9170 * The FFI now supports variadic functions.
9171 * Octal numeric literals, as in `0o7777`.
9172 * The `concat!` syntax extension performs compile-time string concatenation.
9173 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9174 removed as Rust no longer uses segmented stacks.
9175 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9176 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9177 not `*`; ignoring remaining fields of a struct is also done with `..`,
9178 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9179 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9180 * `rustc` supports the "system" calling convention, which defaults to the
9181 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9183 * The `type_overflow` lint (default: warn) checks literals for overflow.
9184 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9185 * The `attribute_usage` lint (default: warn) warns about unknown
9187 * The `unknown_features` lint (default: warn) warns about unknown
9189 * The `dead_code` lint (default: warn) checks for dead code.
9190 * Rust libraries can be linked statically to one another
9191 * `#[link_args]` is behind the `link_args` feature gate.
9192 * Native libraries are now linked with `#[link(name = "foo")]`
9193 * Native libraries can be statically linked to a rust crate
9194 (`#[link(name = "foo", kind = "static")]`).
9195 * Native OS X frameworks are now officially supported
9196 (`#[link(name = "foo", kind = "framework")]`).
9197 * The `#[thread_local]` attribute creates thread-local (not task-local)
9198 variables. Currently behind the `thread_local` feature gate.
9199 * The `return` keyword may be used in closures.
9200 * Types that can be copied via a memcpy implement the `Pod` kind.
9201 * The `cfg` attribute can now be used on struct fields and enum variants.
9204 * std: The `option` and `result` API's have been overhauled to make them
9205 simpler, more consistent, and more composable.
9206 * std: The entire `std::io` module has been replaced with one that is
9207 more comprehensive and that properly interfaces with the underlying
9208 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9210 * std: `io::util` contains a number of useful implementations of
9211 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9212 `ZeroReader`, `TeeReader`.
9213 * std: The reference counted pointer type `extra::rc` moved into std.
9214 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9215 just a wrapper around it).
9216 * std: The `Either` type has been removed.
9217 * std: `fmt::Default` can be implemented for any type to provide default
9218 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9219 * std: The `rand` API continues to be tweaked.
9220 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9221 on failure in gdb, is now named `rust_fail`.
9222 * std: The `each_key` and `each_value` methods on `HashMap` have been
9223 replaced by the `keys` and `values` iterators.
9224 * std: Functions dealing with type size and alignment have moved from the
9225 `sys` module to the `mem` module.
9226 * std: The `path` module was written and API changed.
9227 * std: `str::from_utf8` has been changed to cast instead of allocate.
9228 * std: `starts_with` and `ends_with` methods added to vectors via the
9229 `ImmutableEqVector` trait, which is in the prelude.
9230 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9231 if the index is out of bounds.
9232 * std: Task failure no longer propagates between tasks, as the model was
9233 complex, expensive, and incompatible with thread-based tasks.
9234 * std: The `Any` type can be used for dynamic typing.
9235 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9237 * std: Methods that produce iterators generally do not have an `_iter`
9239 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9240 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9241 * std: `util::ignore` renamed to `prelude::drop`.
9242 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9244 * std: `vec::raw` has seen a lot of cleanup and API changes.
9245 * std: The standard library no longer includes any C++ code, and very
9246 minimal C, eliminating the dependency on libstdc++.
9247 * std: Runtime scheduling and I/O functionality has been factored out into
9248 extensible interfaces and is now implemented by two different crates:
9249 libnative, for native threading and I/O; and libgreen, for green threading
9250 and I/O. This paves the way for using the standard library in more limited
9251 embedded environments.
9252 * std: The `comm` module has been rewritten to be much faster, have a
9253 simpler, more consistent API, and to work for both native and green
9255 * std: All libuv dependencies have been moved into the rustuv crate.
9256 * native: New implementations of runtime scheduling on top of OS threads.
9257 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9259 * green: The green thread scheduler and message passing types are almost
9261 * extra: The `flatpipes` module had bitrotted and was removed.
9262 * extra: All crypto functions have been removed and Rust now has a policy of
9263 not reimplementing crypto in the standard library. In the future crypto
9264 will be provided by external crates with bindings to established libraries.
9265 * extra: `c_vec` has been modernized.
9266 * extra: The `sort` module has been removed. Use the `sort` method on
9270 * The `rust` and `rusti` commands have been removed, due to lack of
9272 * `rustdoc` was completely rewritten.
9273 * `rustdoc` can test code examples in documentation.
9274 * `rustpkg` can test packages with the argument, 'test'.
9275 * `rustpkg` supports arbitrary dependencies, including C libraries.
9276 * `rustc`'s support for generating debug info is improved again.
9277 * `rustc` has better error reporting for unbalanced delimiters.
9278 * `rustc`'s JIT support was removed due to bitrot.
9279 * Executables and static libraries can be built with LTO (-Z lto)
9280 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9284 Version 0.8 (2013-09-26)
9285 ============================
9287 * ~2200 changes, numerous bugfixes
9290 * The `for` loop syntax has changed to work with the `Iterator` trait.
9291 * At long last, unwinding works on Windows.
9292 * Default methods are ready for use.
9293 * Many trait inheritance bugs fixed.
9294 * Owned and borrowed trait objects work more reliably.
9295 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9296 * rustc can omit emission of code for the `debug!` macro if it is passed
9298 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9299 for foo.rs, then foo/mod.rs, and will generate an error when both are
9301 * Strings no longer contain trailing nulls. The new `std::c_str` module
9302 provides new mechanisms for converting to C strings.
9303 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9304 * The FFI has been overhauled such that foreign functions are called directly,
9305 instead of through a stack-switching wrapper.
9306 * Calling a foreign function must be done through a Rust function with the
9307 `#[fixed_stack_segment]` attribute.
9308 * The `externfn!` macro can be used to declare both a foreign function and
9309 a `#[fixed_stack_segment]` wrapper at once.
9310 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9311 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9312 * `priv` is disallowed everywhere except for struct fields and enum variants.
9313 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9314 * `ref` bindings in irrefutable patterns work correctly now.
9315 * `char` is now prevented from containing invalid code points.
9316 * Casting to `bool` is no longer allowed.
9317 * `\0` is now accepted as an escape in chars and strings.
9318 * `yield` is a reserved keyword.
9319 * `typeof` is a reserved keyword.
9320 * Crates may be imported by URL with `extern mod foo = "url";`.
9321 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9322 * Static vectors can be initialized with repeating elements,
9323 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9324 * Static structs can be initialized with functional record update,
9325 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9326 * `cfg!` can be used to conditionally execute code based on the crate
9327 configuration, similarly to `#[cfg(...)]`.
9328 * The `unnecessary_qualification` lint detects unneeded module
9329 prefixes (default: allow).
9330 * Arithmetic operations have been implemented on the SIMD types in
9331 `std::unstable::simd`.
9332 * Exchange allocation headers were removed, reducing memory usage.
9333 * `format!` implements a completely new, extensible, and higher-performance
9334 string formatting system. It will replace `fmt!`.
9335 * `print!` and `println!` write formatted strings (using the `format!`
9336 extension) to stdout.
9337 * `write!` and `writeln!` write formatted strings (using the `format!`
9338 extension) to the new Writers in `std::rt::io`.
9339 * The library section in which a function or static is placed may
9340 be specified with `#[link_section = "..."]`.
9341 * The `proto!` syntax extension for defining bounded message protocols
9343 * `macro_rules!` is hygienic for `let` declarations.
9344 * The `#[export_name]` attribute specifies the name of a symbol.
9345 * `unreachable!` can be used to indicate unreachable code, and fails
9349 * std: Transitioned to the new runtime, written in Rust.
9350 * std: Added an experimental I/O library, `rt::io`, based on the new
9352 * std: A new generic `range` function was added to the prelude, replacing
9353 `uint::range` and friends.
9354 * std: `range_rev` no longer exists. Since range is an iterator it can be
9355 reversed with `range(lo, hi).invert()`.
9356 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9357 renamed to `unwrap_or`.
9358 * std: The `iterator` module was renamed to `iter`.
9359 * std: Integral types now support the `checked_add`, `checked_sub`, and
9360 `checked_mul` operations for detecting overflow.
9361 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9363 * std: Methods are standardizing on conventions for casting methods:
9364 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9366 * std: The `CString` type in `c_str` provides new ways to convert to and
9368 * std: `DoubleEndedIterator` can yield elements in two directions.
9369 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9371 * std: `str::from_bytes` renamed to `str::from_utf8`.
9372 * std: `pop_opt` and `shift_opt` methods added to vectors.
9373 * std: The task-local data interface no longer uses @, and keys are
9374 no longer function pointers.
9375 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9376 * std: Added `SharedPort` to `comm`.
9377 * std: `Eq` has a default method for `ne`; only `eq` is required
9379 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9380 is required in implementations.
9381 * std: `is_utf8` performance is improved, impacting many string functions.
9382 * std: `os::MemoryMap` provides cross-platform mmap.
9383 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9384 are not 'in-bounds' are considered undefined.
9385 * std: Many freestanding functions in `vec` removed in favor of methods.
9386 * std: Many freestanding functions on scalar types removed in favor of
9388 * std: Many options to task builders were removed since they don't make
9389 sense in the new scheduler design.
9390 * std: More containers implement `FromIterator` so can be created by the
9392 * std: More complete atomic types in `unstable::atomics`.
9393 * std: `comm::PortSet` removed.
9394 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9395 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9396 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9397 default implementations.
9398 * std: Various `from_str` functions were removed in favor of a generic
9399 `from_str` which is available in the prelude.
9400 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9401 * extra: `dlist`, the doubly-linked list was modernized.
9402 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9403 * extra: Added `glob` module, replacing `std::os::glob`.
9404 * extra: `rope` was removed.
9405 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9406 * extra: `net`, and `timer` were removed. The experimental replacements
9407 are `std::rt::io::net` and `std::rt::io::timer`.
9408 * extra: Iterators implemented for `SmallIntMap`.
9409 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9410 * extra: `SmallIntSet` removed. Use `BitvSet`.
9411 * extra: Performance of JSON parsing greatly improved.
9412 * extra: `semver` updated to SemVer 2.0.0.
9413 * extra: `term` handles more terminals correctly.
9414 * extra: `dbg` module removed.
9415 * extra: `par` module removed.
9416 * extra: `future` was cleaned up, with some method renames.
9417 * extra: Most free functions in `getopts` were converted to methods.
9420 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9421 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9422 similarly to gcc's `--march` flag.
9423 * rustc's performance compiling small crates is much better.
9424 * rustpkg has received many improvements.
9425 * rustpkg supports git tags as package IDs.
9426 * rustpkg builds into target-specific directories so it can be used for
9428 * The number of concurrent test tasks is controlled by the environment
9429 variable RUST_TEST_TASKS.
9430 * The test harness can now report metrics for benchmarks.
9431 * All tools have man pages.
9432 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9433 * The runtime uses jemalloc for allocations.
9434 * Segmented stacks are temporarily disabled as part of the transition to
9435 the new runtime. Stack overflows are possible!
9436 * A new documentation backend, rustdoc_ng, is available for use. It is
9437 still invoked through the normal `rustdoc` command.
9440 Version 0.7 (2013-07-03)
9441 =======================
9443 * ~2000 changes, numerous bugfixes
9446 * `impl`s no longer accept a visibility qualifier. Put them on methods
9448 * The borrow checker has been rewritten with flow-sensitivity, fixing
9449 many bugs and inconveniences.
9450 * The `self` parameter no longer implicitly means `&'self self`,
9451 and can be explicitly marked with a lifetime.
9452 * Overloadable compound operators (`+=`, etc.) have been temporarily
9453 removed due to bugs.
9454 * The `for` loop protocol now requires `for`-iterators to return `bool`
9455 so they compose better.
9456 * The `Durable` trait is replaced with the `'static` bounds.
9457 * Trait default methods work more often.
9458 * Structs with the `#[packed]` attribute have byte alignment and
9459 no padding between fields.
9460 * Type parameters bound by `Copy` must now be copied explicitly with
9462 * It is now illegal to move out of a dereferenced unsafe pointer.
9463 * `Option<~T>` is now represented as a nullable pointer.
9464 * `@mut` does dynamic borrow checks correctly.
9465 * The `main` function is only detected at the topmost level of the crate.
9466 The `#[main]` attribute is still valid anywhere.
9467 * Struct fields may no longer be mutable. Use inherited mutability.
9468 * The `#[no_send]` attribute makes a type that would otherwise be
9470 * The `#[no_freeze]` attribute makes a type that would otherwise be
9472 * Unbounded recursion will abort the process after reaching the limit
9473 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9474 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9475 are never implicitly copyable.
9476 * `#[static_assert]` makes compile-time assertions about static bools.
9477 * At long last, 'argument modes' no longer exist.
9478 * The rarely used `use mod` statement no longer exists.
9481 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9483 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9484 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9486 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9487 and unsuffixed integer literals.
9490 * The `core` crate was renamed to `std`.
9491 * The `std` crate was renamed to `extra`.
9492 * More and improved documentation.
9493 * std: `iterator` module for external iterator objects.
9494 * Many old-style (internal, higher-order function) iterators replaced by
9495 implementations of `Iterator`.
9496 * std: Many old internal vector and string iterators,
9497 incl. `any`, `all`. removed.
9498 * std: The `finalize` method of `Drop` renamed to `drop`.
9499 * std: The `drop` method now takes `&mut self` instead of `&self`.
9500 * std: The prelude no longer re-exports any modules, only types and traits.
9501 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9502 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9503 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9504 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9505 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9506 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9507 * std: Many types implement `Clone`.
9508 * std: `path` type renamed to `Path`.
9509 * std: `mut` module and `Mut` type removed.
9510 * std: Many standalone functions removed in favor of methods and iterators
9511 in `vec`, `str`. In the future methods will also work as functions.
9512 * std: `reinterpret_cast` removed. Use `transmute`.
9513 * std: ascii string handling in `std::ascii`.
9514 * std: `Rand` is implemented for ~/@.
9515 * std: `run` module for spawning processes overhauled.
9516 * std: Various atomic types added to `unstable::atomic`.
9517 * std: Various types implement `Zero`.
9518 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9519 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9520 * std: Added `os::mkdir_recursive`.
9521 * std: Added `os::glob` function performs filesystems globs.
9522 * std: `FuzzyEq` renamed to `ApproxEq`.
9523 * std: `Map` now defines `pop` and `swap` methods.
9524 * std: `Cell` constructors converted to static methods.
9525 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9526 * extra: `flate` module moved from `std` to `extra`.
9527 * extra: `fileinput` module for iterating over a series of files.
9528 * extra: `Complex` number type and `complex` module.
9529 * extra: `Rational` number type and `rational` module.
9530 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9531 * extra: `term` uses terminfo now, is more correct.
9532 * extra: `arc` functions converted to methods.
9533 * extra: Implementation of fixed output size variations of SHA-2.
9536 * `unused_variables` lint mode for unused variables (default: warn).
9537 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9539 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9541 * `dead_assignment` lint mode for unread variables (default: warn).
9542 * `unnecessary_allocation` lint mode detects some heap allocations that are
9543 immediately borrowed so could be written without allocating (default: warn).
9544 * `missing_doc` lint mode (default: allow).
9545 * `unreachable_code` lint mode (default: warn).
9546 * The `rusti` command has been rewritten and a number of bugs addressed.
9547 * rustc outputs in color on more terminals.
9548 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9549 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9550 * Compiling with `-g` will make the binary record information about
9551 dynamic borrowcheck failures for debugging.
9552 * rustdoc has a nicer stylesheet.
9553 * Various improvements to rustdoc.
9554 * Improvements to rustpkg (see the detailed release notes).
9557 Version 0.6 (2013-04-03)
9558 ========================
9560 * ~2100 changes, numerous bugfixes
9563 * The self type parameter in traits is now spelled `Self`
9564 * The `self` parameter in trait and impl methods must now be explicitly
9565 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9566 * Static methods no longer require the `static` keyword and instead
9567 are distinguished by the lack of a `self` parameter
9568 * Replaced the `Durable` trait with the `'static` lifetime
9569 * The old closure type syntax with the trailing sigil has been
9570 removed in favor of the more consistent leading sigil
9571 * `super` is a keyword, and may be prefixed to paths
9572 * Trait bounds are separated with `+` instead of whitespace
9573 * Traits are implemented with `impl Trait for Type`
9574 instead of `impl Type: Trait`
9575 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9576 * The `export` keyword has finally been removed
9577 * The `move` keyword has been removed (see "Semantic changes")
9578 * The interior mutability qualifier on vectors, `[mut T]`, has been
9579 removed. Use `&mut [T]`, etc.
9580 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9581 * `fail` is no longer a keyword. Use `fail!()`
9582 * `assert` is no longer a keyword. Use `assert!()`
9583 * `log` is no longer a keyword. use `debug!`, etc.
9584 * 1-tuples may be represented as `(T,)`
9585 * Struct fields may no longer be `mut`. Use inherited mutability,
9586 `@mut T`, `core::mut` or `core::cell`
9587 * `extern mod { ... }` is no longer valid syntax for foreign
9588 function modules. Use extern blocks: `extern { ... }`
9589 * Newtype enums removed. Use tuple-structs.
9590 * Trait implementations no longer support visibility modifiers
9591 * Pattern matching over vectors improved and expanded
9592 * `const` renamed to `static` to correspond to lifetime name,
9593 and make room for future `static mut` unsafe mutable globals.
9594 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9595 * `Clone` implementations can be automatically generated with
9596 `#[deriving(Clone)]`
9597 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9598 instead of `foo as Bar`.
9599 * Fixed length vector types are now written as `[int, .. 3]`
9600 instead of `[int * 3]`.
9601 * Fixed length vector types can express the length as a constant
9602 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9605 * Types with owned pointers or custom destructors move by default,
9606 eliminating the `move` keyword
9607 * All foreign functions are considered unsafe
9608 * &mut is now unaliasable
9609 * Writes to borrowed @mut pointers are prevented dynamically
9611 * The name of the main function can be customized using #[main]
9612 * The default type of an inferred closure is &fn instead of @fn
9613 * `use` statements may no longer be "chained" - they cannot import
9614 identifiers imported by previous `use` statements
9615 * `use` statements are crate relative, importing from the "top"
9616 of the crate by default. Paths may be prefixed with `super::`
9617 or `self::` to change the search behavior.
9618 * Method visibility is inherited from the implementation declaration
9619 * Structural records have been removed
9620 * Many more types can be used in static items, including enums
9621 'static-lifetime pointers and vectors
9622 * Pattern matching over vectors improved and expanded
9623 * Typechecking of closure types has been overhauled to
9624 improve inference and eliminate unsoundness
9625 * Macros leave scope at the end of modules, unless that module is
9626 tagged with #[macro_escape]
9629 * Added big integers to `std::bigint`
9630 * Removed `core::oldcomm` module
9631 * Added pipe-based `core::comm` module
9632 * Numeric traits have been reorganized under `core::num`
9633 * `vec::slice` finally returns a slice
9634 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9635 * Containers reorganized around traits in `core::container`
9636 * `core::dvec` removed, `~[T]` is a drop-in replacement
9637 * `core::send_map` renamed to `core::hashmap`
9638 * `std::map` removed; replaced with `core::hashmap`
9639 * `std::treemap` reimplemented as an owned balanced tree
9640 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9641 * `core::trie` added as a fast ordered map for integer keys
9642 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9643 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9644 overload the comparison operators, whereas `TotalOrd` is used
9645 by certain container types
9648 * Replaced the 'cargo' package manager with 'rustpkg'
9649 * Added all-purpose 'rust' tool
9650 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9651 * rustc now *attempts* to offer spelling suggestions
9652 * Improved support for ARM and Android
9653 * Preliminary MIPS backend
9654 * Improved foreign function ABI implementation for x86, x86_64
9655 * Various memory usage improvements
9656 * Rust code may be embedded in foreign code under limited circumstances
9657 * Inline assembler supported by new asm!() syntax extension.
9660 Version 0.5 (2012-12-21)
9661 ===========================
9663 * ~900 changes, numerous bugfixes
9666 * Removed `<-` move operator
9667 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9668 * Removed old fixed length vector syntax - `[T]/N`
9669 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9670 * Macros may now expand to items and statements
9671 * `a.b()` is always parsed as a method call, never as a field projection
9672 * `Eq` and `IterBytes` implementations can be automatically generated
9673 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9674 * Removed the special crate language for `.rc` files
9675 * Function arguments may consist of any irrefutable pattern
9678 * `&` and `~` pointers may point to objects
9679 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9680 * Enum variants may be structs
9681 * Destructors can be added to all nominal types with the Drop trait
9682 * Structs and nullary enum variants may be constants
9683 * Values that cannot be implicitly copied are now automatically moved
9684 without writing `move` explicitly
9685 * `&T` may now be coerced to `*T`
9686 * Coercions happen in `let` statements as well as function calls
9687 * `use` statements now take crate-relative paths
9688 * The module and type namespaces have been merged so that static
9689 method names can be resolved under the trait in which they are
9692 * Improved support for language features
9693 * Trait inheritance works in many scenarios
9694 * More support for explicit self arguments in methods - `self`, `&self`
9695 `@self`, and `~self` all generally work as expected
9696 * Static methods work in more situations
9697 * Experimental: Traits may declare default methods for the implementations
9701 * New condition handling system in `core::condition`
9702 * Timsort added to `std::sort`
9703 * New priority queue, `std::priority_queue`
9704 * Pipes for serializable types, `std::flatpipes'
9705 * Serialization overhauled to be trait-based
9706 * Expanded `getopts` definitions
9707 * Moved futures to `std`
9708 * More functions are pure now
9709 * `core::comm` renamed to `oldcomm`. Still deprecated
9710 * `rustdoc` and `cargo` are libraries now
9713 * Added a preliminary REPL, `rusti`
9714 * License changed from MIT to dual MIT/APL2
9717 Version 0.4 (2012-10-15)
9718 ==========================
9720 * ~2000 changes, numerous bugfixes
9723 * All keywords are now strict and may not be used as identifiers anywhere
9724 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9725 'of', 'with', 'to', 'class'.
9726 * Classes are replaced with simpler structs
9727 * Explicit method self types
9728 * `ret` became `return` and `alt` became `match`
9729 * `import` is now `use`; `use is now `extern mod`
9730 * `extern mod { ... }` is now `extern { ... }`
9731 * `use mod` is the recommended way to import modules
9732 * `pub` and `priv` replace deprecated export lists
9733 * The syntax of `match` pattern arms now uses fat arrow (=>)
9734 * `main` no longer accepts an args vector; use `os::args` instead
9737 * Trait implementations are now coherent, ala Haskell typeclasses
9738 * Trait methods may be static
9739 * Argument modes are deprecated
9740 * Borrowed pointers are much more mature and recommended for use
9741 * Strings and vectors in the static region are stored in constant memory
9742 * Typestate was removed
9743 * Resolution rewritten to be more reliable
9744 * Support for 'dual-mode' data structures (freezing and thawing)
9747 * Most binary operators can now be overloaded via the traits in
9749 * `std::net::url` for representing URLs
9750 * Sendable hash maps in `core::send_map`
9751 * `core::task' gained a (currently unsafe) task-local storage API
9754 * An efficient new intertask communication primitive called the pipe,
9755 along with a number of higher-level channel types, in `core::pipes`
9756 * `std::arc`, an atomically reference counted, immutable, shared memory
9758 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9759 * Futures are now based on pipes and sendable
9760 * More robust linked task failure
9761 * Improved task builder API
9764 * Improved error reporting
9765 * Preliminary JIT support
9766 * Preliminary work on precise GC
9767 * Extensive architectural improvements to rustc
9768 * Begun a transition away from buggy C++-based reflection (shape) code to
9769 Rust-based (visitor) code
9770 * All hash functions and tables converted to secure, randomized SipHash
9773 Version 0.3 (2012-07-12)
9774 ========================
9776 * ~1900 changes, numerous bugfixes
9778 * New coding conveniences
9779 * Integer-literal suffix inference
9780 * Per-item control over warnings, errors
9781 * #[cfg(windows)] and #[cfg(unix)] attributes
9782 * Documentation comments
9783 * More compact closure syntax
9784 * 'do' expressions for treating higher-order functions as
9786 * *-patterns (wildcard extended to all constructor fields)
9789 * Name resolution pass and exhaustiveness checker rewritten
9790 * Region pointers and borrow checking supersede alias
9792 * Init-ness checking is now provided by a region-based liveness
9793 pass instead of the typestate pass; same for last-use analysis
9794 * Extensive work on region pointers
9796 * Experimental new language features
9797 * Slices and fixed-size, interior-allocated vectors
9798 * #!-comments for lang versioning, shell execution
9799 * Destructors and iface implementation for classes;
9800 type-parameterized classes and class methods
9801 * 'const' type kind for types that can be used to implement
9802 shared-memory concurrency patterns
9806 * Removal of various obsolete features
9807 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9808 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9810 * Constructs: do-while loops ('do' repurposed), fn binding,
9811 resources (replaced by destructors)
9813 * Compiler reorganization
9814 * Syntax-layer of compiler split into separate crate
9815 * Clang (from LLVM project) integrated into build
9816 * Typechecker split into sub-modules
9819 * New time functions
9820 * Extension methods for many built-in types
9821 * Arc: atomic-refcount read-only / exclusive-use shared cells
9822 * Par: parallel map and search routines
9823 * Extensive work on libuv interface
9824 * Much vector code moved to libraries
9825 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9826 #include, #include_str, #include_bin
9829 * Cargo automatically resolves dependencies
9832 Version 0.2 (2012-03-29)
9833 =========================
9835 * >1500 changes, numerous bugfixes
9837 * New docs and doc tooling
9839 * New port: FreeBSD x86_64
9841 * Compilation model enhancements
9842 * Generics now specialized, multiply instantiated
9843 * Functions now inlined across separate crates
9845 * Scheduling, stack and threading fixes
9846 * Noticeably improved message-passing performance
9847 * Explicit schedulers
9851 * Experimental new language features
9852 * Operator overloading
9856 * Various language extensions
9857 * C-callback function types: 'crust fn ...'
9858 * Infinite-loop construct: 'loop { ... }'
9859 * Shorten 'mutable' to 'mut'
9860 * Required mutable-local qualifier: 'let mut ...'
9861 * Basic glob-exporting: 'export foo::*;'
9862 * Alt now exhaustive, 'alt check' for runtime-checked
9863 * Block-function form of 'for' loop, with 'break' and 'ret'.
9866 * AST quasi-quote syntax extension
9867 * Revived libuv interface
9868 * New modules: core::{future, iter}, std::arena
9869 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9870 * Extensive cleanup, regularization in libstd, libcore
9873 Version 0.1 (2012-01-20)
9874 ===============================
9876 * Most language features work, including:
9877 * Unique pointers, unique closures, move semantics
9878 * Interface-constrained generics
9879 * Static interface dispatch
9881 * Multithread task scheduling
9882 * Typestate predicates
9883 * Failure unwinding, destructors
9884 * Pattern matching and destructuring assignment
9885 * Lightweight block-lambda syntax
9886 * Preliminary macro-by-example
9888 * Compiler works with the following configurations:
9889 * Linux: x86 and x86_64 hosts and targets
9890 * macOS: x86 and x86_64 hosts and targets
9891 * Windows: x86 hosts and targets
9893 * Cross compilation / multi-target configuration supported.
9895 * Preliminary API-documentation and package-management tools included.
9899 * Documentation is incomplete.
9901 * Performance is below intended target.
9903 * Standard library APIs are subject to extensive change, reorganization.
9905 * Language-level versioning is not yet operational - future code will