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]
1911 - [`rustc` will now warn about some incorrect uses of
1912 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1916 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1918 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1919 issues][62896] with certain crates such as libc.
1921 [60260]: https://github.com/rust-lang/rust/pull/60260/
1922 [61457]: https://github.com/rust-lang/rust/pull/61457/
1923 [61491]: https://github.com/rust-lang/rust/pull/61491/
1924 [61884]: https://github.com/rust-lang/rust/pull/61884/
1925 [61953]: https://github.com/rust-lang/rust/pull/61953/
1926 [62042]: https://github.com/rust-lang/rust/pull/62042/
1927 [62528]: https://github.com/rust-lang/rust/pull/62528/
1928 [62583]: https://github.com/rust-lang/rust/pull/62583/
1929 [62735]: https://github.com/rust-lang/rust/pull/62735/
1930 [62766]: https://github.com/rust-lang/rust/pull/62766/
1931 [62784]: https://github.com/rust-lang/rust/pull/62784/
1932 [62592]: https://github.com/rust-lang/rust/pull/62592/
1933 [62785]: https://github.com/rust-lang/rust/issues/62785/
1934 [62814]: https://github.com/rust-lang/rust/pull/62814/
1935 [62896]: https://github.com/rust-lang/rust/issues/62896/
1936 [63000]: https://github.com/rust-lang/rust/pull/63000/
1937 [63056]: https://github.com/rust-lang/rust/pull/63056/
1938 [63107]: https://github.com/rust-lang/rust/pull/63107/
1939 [63346]: https://github.com/rust-lang/rust/pull/63346/
1940 [63421]: https://github.com/rust-lang/rust/pull/63421/
1941 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1942 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1943 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1944 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1945 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1946 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1947 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1948 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1949 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1950 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1951 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1952 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1953 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1954 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
1955 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1957 Version 1.37.0 (2019-08-15)
1958 ==========================
1962 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1963 [`Box`][62228], or an [array][62235] and unused.
1964 - [You can now use the `cfg` and `cfg_attr` attributes on
1965 generic parameters.][61547]
1966 - [You can now use enum variants through type alias.][61682] e.g. You can
1967 write the following:
1969 type MyOption = Option<u8>;
1971 fn increment_or_zero(x: MyOption) -> u8 {
1973 MyOption::Some(y) => y + 1,
1974 MyOption::None => 0,
1978 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1979 `const _: u32 = 5;`.
1980 - [You can now use `#[repr(align(X)]` on enums.][61229]
1981 - [The `?` Kleene macro operator is now available in the
1982 2015 edition.][60932]
1986 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1987 and `-C profile-use` flags.][61268] For more information on how to use profile
1988 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1989 - [The `rust-lldb` wrapper script should now work again.][61827]
1993 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1997 - [`BufReader::buffer`]
1998 - [`BufWriter::buffer`]
1999 - [`Cell::from_mut`]
2000 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2001 - [`DoubleEndedIterator::nth_back`]
2003 - [`Wrapping::reverse_bits`]
2004 - [`i128::reverse_bits`]
2005 - [`i16::reverse_bits`]
2006 - [`i32::reverse_bits`]
2007 - [`i64::reverse_bits`]
2008 - [`i8::reverse_bits`]
2009 - [`isize::reverse_bits`]
2010 - [`slice::copy_within`]
2011 - [`u128::reverse_bits`]
2012 - [`u16::reverse_bits`]
2013 - [`u32::reverse_bits`]
2014 - [`u64::reverse_bits`]
2015 - [`u8::reverse_bits`]
2016 - [`usize::reverse_bits`]
2020 - [`Cargo.lock` files are now included by default when publishing executable crates
2021 with executables.][cargo/7026]
2022 - [You can now specify `default-run="foo"` in `[package]` to specify the
2023 default executable to use for `cargo run`.][cargo/7056]
2030 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2031 Please transition your code to using the `..=` syntax for inclusive
2033 - [Using a trait object without the `dyn` will now warn by default.][61203]
2034 Please transition your code to use `dyn Trait` for trait objects instead.
2036 [62228]: https://github.com/rust-lang/rust/pull/62228/
2037 [62235]: https://github.com/rust-lang/rust/pull/62235/
2038 [61802]: https://github.com/rust-lang/rust/pull/61802/
2039 [61827]: https://github.com/rust-lang/rust/pull/61827/
2040 [61547]: https://github.com/rust-lang/rust/pull/61547/
2041 [61682]: https://github.com/rust-lang/rust/pull/61682/
2042 [61268]: https://github.com/rust-lang/rust/pull/61268/
2043 [61342]: https://github.com/rust-lang/rust/pull/61342/
2044 [61347]: https://github.com/rust-lang/rust/pull/61347/
2045 [61100]: https://github.com/rust-lang/rust/pull/61100/
2046 [61203]: https://github.com/rust-lang/rust/pull/61203/
2047 [61229]: https://github.com/rust-lang/rust/pull/61229/
2048 [60932]: https://github.com/rust-lang/rust/pull/60932/
2049 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2050 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2051 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2052 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2053 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2054 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2055 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2056 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2057 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2058 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2059 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2060 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2061 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2062 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2063 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2064 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2065 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2066 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2067 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2068 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2069 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2070 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2071 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2072 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2075 Version 1.36.0 (2019-07-04)
2076 ==========================
2080 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2081 - [The order of traits in trait objects no longer affects the semantics of that
2082 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2083 `dyn fmt::Debug + Send`, where this was previously not the case.
2087 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2088 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2089 - [`mem::needs_drop` is now available as a const fn.][60364]
2090 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2091 - [`String` now implements `BorrowMut<str>`.][60404]
2092 - [`io::Cursor` now implements `Default`.][60234]
2093 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2094 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2095 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2096 environment has access to heap memory allocation.
2097 - [`String` now implements `From<&String>`.][59825]
2098 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2099 return a tuple of each argument when there is multiple arguments.
2100 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2105 - [`VecDeque::rotate_left`]
2106 - [`VecDeque::rotate_right`]
2107 - [`Iterator::copied`]
2109 - [`io::IoSliceMut`]
2110 - [`Read::read_vectored`]
2111 - [`Write::write_vectored`]
2112 - [`str::as_mut_ptr`]
2113 - [`mem::MaybeUninit`]
2114 - [`pointer::align_offset`]
2115 - [`future::Future`]
2117 - [`task::RawWaker`]
2118 - [`task::RawWakerVTable`]
2124 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2125 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2127 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2131 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2138 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2139 longer recommended, and will be deprecated in 1.39.0.
2141 [60318]: https://github.com/rust-lang/rust/pull/60318/
2142 [60364]: https://github.com/rust-lang/rust/pull/60364/
2143 [60370]: https://github.com/rust-lang/rust/pull/60370/
2144 [60404]: https://github.com/rust-lang/rust/pull/60404/
2145 [60234]: https://github.com/rust-lang/rust/pull/60234/
2146 [60244]: https://github.com/rust-lang/rust/pull/60244/
2147 [58623]: https://github.com/rust-lang/rust/pull/58623/
2148 [59648]: https://github.com/rust-lang/rust/pull/59648/
2149 [59675]: https://github.com/rust-lang/rust/pull/59675/
2150 [59825]: https://github.com/rust-lang/rust/pull/59825/
2151 [59826]: https://github.com/rust-lang/rust/pull/59826/
2152 [59445]: https://github.com/rust-lang/rust/pull/59445/
2153 [59114]: https://github.com/rust-lang/rust/pull/59114/
2154 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2155 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2156 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2157 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2158 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2159 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2160 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2161 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2162 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2163 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2164 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2165 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2166 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2167 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2168 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2169 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2170 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2171 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2172 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2173 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2176 Version 1.35.0 (2019-05-23)
2177 ==========================
2181 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2182 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2183 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2185 unsafe fn call_unsafe(func: unsafe fn()) {
2190 unsafe { call_unsafe(|| {}); }
2197 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2198 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2199 - [Added the `wasm32-unknown-wasi` target.][59464]
2204 - [`Thread` will now show its ID in `Debug` output.][59460]
2205 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2206 - [`alloc::System` now implements `Default`.][59451]
2207 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2209 - [`char::{ToLowercase, ToUppercase}` now
2210 implement `ExactSizeIterator`.][58778]
2211 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2212 - [Removed the `Read` trait bounds
2213 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2214 - [You can now call the `dbg!` macro without any parameters to print the file
2215 and line where it is called.][57847]
2216 - [In place ASCII case conversions are now up to 4× faster.][59283]
2217 e.g. `str::make_ascii_lowercase`
2218 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2225 - [`RefCell::replace_with`]
2226 - [`RefCell::map_split`]
2228 - [`Range::contains`]
2229 - [`RangeFrom::contains`]
2230 - [`RangeTo::contains`]
2231 - [`RangeInclusive::contains`]
2232 - [`RangeToInclusive::contains`]
2233 - [`Option::copied`]
2237 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2238 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2243 - [The Rust toolchain is now available natively for musl based distros.][58575]
2245 [59460]: https://github.com/rust-lang/rust/pull/59460/
2246 [59464]: https://github.com/rust-lang/rust/pull/59464/
2247 [59500]: https://github.com/rust-lang/rust/pull/59500/
2248 [59512]: https://github.com/rust-lang/rust/pull/59512/
2249 [59580]: https://github.com/rust-lang/rust/pull/59580/
2250 [59283]: https://github.com/rust-lang/rust/pull/59283/
2251 [59451]: https://github.com/rust-lang/rust/pull/59451/
2252 [59076]: https://github.com/rust-lang/rust/pull/59076/
2253 [58778]: https://github.com/rust-lang/rust/pull/58778/
2254 [58717]: https://github.com/rust-lang/rust/pull/58717/
2255 [58369]: https://github.com/rust-lang/rust/pull/58369/
2256 [58423]: https://github.com/rust-lang/rust/pull/58423/
2257 [58080]: https://github.com/rust-lang/rust/pull/58080/
2258 [57847]: https://github.com/rust-lang/rust/pull/57847/
2259 [58575]: https://github.com/rust-lang/rust/pull/58575
2260 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2261 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2262 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2263 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2264 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2265 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2266 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2267 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2268 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2269 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2270 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2271 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2273 Version 1.34.2 (2019-05-14)
2274 ===========================
2276 * [Destabilize the `Error::type_id` function due to a security
2277 vulnerability][60785] ([CVE-2019-12083])
2279 [60785]: https://github.com/rust-lang/rust/pull/60785
2280 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2282 Version 1.34.1 (2019-04-25)
2283 ===========================
2285 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2286 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2287 * [Fix Clippy panic when checking some macros][clippy/3805]
2289 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2290 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2291 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2293 Version 1.34.0 (2019-04-11)
2294 ==========================
2298 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2299 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2301 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2302 `#[attr{}]` procedural macros.][57367]
2303 - [You can now write `extern crate self as foo;`][57407] to import your
2304 crate's root into the extern prelude.
2309 - [You can now target `riscv64imac-unknown-none-elf` and
2310 `riscv64gc-unknown-none-elf`.][58406]
2311 - [You can now enable linker plugin LTO optimisations with
2312 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2313 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2315 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2320 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2321 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2322 the `Hash` trait to create an iterator.
2323 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2324 methods.][58421] Most notably you no longer require the `Ord` trait to create
2326 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2327 for all numeric types.][58044]
2328 - [Indexing a `str` is now generic over all types that
2329 implement `SliceIndex<str>`.][57604]
2330 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2331 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2332 produce a warning if their returning type is unused.
2333 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2334 `overflowing_pow` are now available for all numeric types.][57873] These are
2335 equivalent to methods such as `wrapping_add` for the `pow` operation.
2343 * [`Error::type_id`]
2344 * [`atomic::AtomicI16`]
2345 * [`atomic::AtomicI32`]
2346 * [`atomic::AtomicI64`]
2347 * [`atomic::AtomicI8`]
2348 * [`atomic::AtomicU16`]
2349 * [`atomic::AtomicU32`]
2350 * [`atomic::AtomicU64`]
2351 * [`atomic::AtomicU8`]
2352 * [`convert::Infallible`]
2353 * [`convert::TryFrom`]
2354 * [`convert::TryInto`]
2356 * [`iter::successors`]
2357 * [`num::NonZeroI128`]
2358 * [`num::NonZeroI16`]
2359 * [`num::NonZeroI32`]
2360 * [`num::NonZeroI64`]
2361 * [`num::NonZeroI8`]
2362 * [`num::NonZeroIsize`]
2363 * [`slice::sort_by_cached_key`]
2364 * [`str::escape_debug`]
2365 * [`str::escape_default`]
2366 * [`str::escape_unicode`]
2367 * [`str::split_ascii_whitespace`]
2370 * [`Instant::checked_add`]
2371 * [`Instant::checked_sub`]
2372 * [`SystemTime::checked_add`]
2373 * [`SystemTime::checked_sub`]
2377 - [You can now use alternative registries to crates.io.][cargo/6654]
2381 - [You can now use the `?` operator in your documentation tests without manually
2382 adding `fn main() -> Result<(), _> {}`.][56470]
2386 - [`Command::before_exec` is being replaced by the unsafe method
2387 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2388 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2389 can now use `const` functions in `static` variables.
2391 [58370]: https://github.com/rust-lang/rust/pull/58370/
2392 [58406]: https://github.com/rust-lang/rust/pull/58406/
2393 [58421]: https://github.com/rust-lang/rust/pull/58421/
2394 [58166]: https://github.com/rust-lang/rust/pull/58166/
2395 [58044]: https://github.com/rust-lang/rust/pull/58044/
2396 [58057]: https://github.com/rust-lang/rust/pull/58057/
2397 [58059]: https://github.com/rust-lang/rust/pull/58059/
2398 [57809]: https://github.com/rust-lang/rust/pull/57809/
2399 [57873]: https://github.com/rust-lang/rust/pull/57873/
2400 [57604]: https://github.com/rust-lang/rust/pull/57604/
2401 [57367]: https://github.com/rust-lang/rust/pull/57367/
2402 [57407]: https://github.com/rust-lang/rust/pull/57407/
2403 [57425]: https://github.com/rust-lang/rust/pull/57425/
2404 [57106]: https://github.com/rust-lang/rust/pull/57106/
2405 [56470]: https://github.com/rust-lang/rust/pull/56470/
2406 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2407 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2408 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2409 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2410 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2411 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2412 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2413 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2414 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2415 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2416 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2417 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2418 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2419 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2420 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2421 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2422 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2423 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2424 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2425 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2426 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2427 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2428 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2429 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2430 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2431 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2432 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2433 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2434 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2435 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2436 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2439 Version 1.33.0 (2019-02-28)
2440 ==========================
2444 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2445 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2446 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2447 E.g. You can have match statement on a `u8` that covers `0..=255` and
2448 you would no longer be required to have a `_ => unreachable!()` case.
2449 - [You can now have multiple patterns in `if let` and `while let`
2450 expressions.][57532] You can do this with the same syntax as a `match`
2460 let state = Creature::Crab("Ferris");
2462 if let Creature::Crab(name) | Creature::Person(name) = state {
2463 println!("This creature's name is: {}", name);
2467 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2468 this feature will by default produce a warning as this behaviour can be
2469 unintuitive. E.g. `if let _ = 5 {}`
2470 - [You can now use `let` bindings, assignments, expression statements,
2471 and irrefutable pattern destructuring in const functions.][57175]
2472 - [You can now call unsafe const functions.][57067] E.g.
2474 const unsafe fn foo() -> i32 { 5 }
2475 const fn bar() -> i32 {
2479 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2480 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2481 - [You can now specify a specific alignment with the `#[repr(packed)]`
2482 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2483 with an alignment of 2 bytes and a size of 6 bytes.
2484 - [You can now import an item from a module as an `_`.][56303] This allows you to
2485 import a trait's impls, and not have the name in the namespace. E.g.
2487 use std::io::Read as _;
2489 // Allowed as there is only one `Read` in the module.
2492 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2496 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2497 command line argument.][56351]
2498 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2499 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2500 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2501 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2502 information on Rust's platform support.
2503 - [Added support for the `thumbv7neon-linux-androideabi` and
2504 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2505 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2509 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2510 functions for all numeric types.][57566]
2511 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2512 are now `const` functions for all numeric types.][57105]
2513 - [The methods `is_positive` and `is_negative` are now `const` functions for
2514 all signed numeric types.][57105]
2515 - [The `get` method for all `NonZero` types is now `const`.][57167]
2516 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2517 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2518 numeric types.][57234]
2519 - [`Ipv4Addr::new` is now a `const` function][57234]
2523 - [`unix::FileExt::read_exact_at`]
2524 - [`unix::FileExt::write_all_at`]
2525 - [`Option::transpose`]
2526 - [`Result::transpose`]
2527 - [`convert::identity`]
2530 - [`marker::PhantomPinned`]
2531 - [`Vec::resize_with`]
2532 - [`VecDeque::resize_with`]
2533 - [`Duration::as_millis`]
2534 - [`Duration::as_micros`]
2535 - [`Duration::as_nanos`]
2540 - [You can now publish crates that require a feature flag to compile with
2541 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2542 - [Cargo should now rebuild a crate if a file was modified during the initial
2547 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2548 are now deprecated in the standard library, and their usage will now produce a warning.
2549 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2551 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2553 - [Libtest no longer creates a new thread for each test when
2554 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2556 [55982]: https://github.com/rust-lang/rust/pull/55982/
2557 [56243]: https://github.com/rust-lang/rust/pull/56243
2558 [56303]: https://github.com/rust-lang/rust/pull/56303/
2559 [56351]: https://github.com/rust-lang/rust/pull/56351/
2560 [56362]: https://github.com/rust-lang/rust/pull/56362
2561 [56642]: https://github.com/rust-lang/rust/pull/56642/
2562 [56769]: https://github.com/rust-lang/rust/pull/56769/
2563 [56805]: https://github.com/rust-lang/rust/pull/56805
2564 [56947]: https://github.com/rust-lang/rust/pull/56947/
2565 [57049]: https://github.com/rust-lang/rust/pull/57049/
2566 [57067]: https://github.com/rust-lang/rust/pull/57067/
2567 [57105]: https://github.com/rust-lang/rust/pull/57105
2568 [57130]: https://github.com/rust-lang/rust/pull/57130/
2569 [57167]: https://github.com/rust-lang/rust/pull/57167/
2570 [57175]: https://github.com/rust-lang/rust/pull/57175/
2571 [57234]: https://github.com/rust-lang/rust/pull/57234/
2572 [57332]: https://github.com/rust-lang/rust/pull/57332/
2573 [57465]: https://github.com/rust-lang/rust/pull/57465/
2574 [57532]: https://github.com/rust-lang/rust/pull/57532/
2575 [57535]: https://github.com/rust-lang/rust/pull/57535/
2576 [57566]: https://github.com/rust-lang/rust/pull/57566/
2577 [57615]: https://github.com/rust-lang/rust/pull/57615/
2578 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2579 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2580 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2581 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2582 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2583 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2584 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2585 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2586 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2587 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2588 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2589 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2590 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2591 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2592 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2593 [platform-support]: https://forge.rust-lang.org/platform-support.html
2595 Version 1.32.0 (2019-01-17)
2596 ==========================
2601 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2602 operator allows you to specify zero or one repetitions similar to the `*` and
2604 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2605 now always resolve to the item (`enum`, `struct`, etc.) available in the
2606 module if present, before resolving to a external crate or an item the prelude.][56759]
2609 enum Color { Red, Green, Blue }
2615 - [You can now match against `PhantomData<T>` types.][55837]
2616 - [You can now match against literals in macros with the `literal`
2617 specifier.][56072] This will match against a literal of any type.
2618 E.g. `1`, `'A'`, `"Hello World"`
2619 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2621 struct Point(i32, i32);
2624 pub fn new(x: i32, y: i32) -> Self {
2628 pub fn is_origin(&self) -> bool {
2636 - [Self can also now be used in type definitions.][56366] E.g.
2640 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2643 Cons(T, Box<Self>) // likewise here
2646 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2647 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2651 - [The default allocator has changed from jemalloc to the default allocator on
2652 your system.][55238] The compiler itself on Linux & macOS will still use
2653 jemalloc, but programs compiled with it will use the system allocator.
2654 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2658 - [`PathBuf` now implements `FromStr`.][55148]
2659 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2660 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2661 easily debug expressions in your rust program. E.g.
2664 let b = dbg!(a * 2) + 1;
2665 // ^-- prints: [src/main.rs:4] a * 2 = 4
2669 The following APIs are now `const` functions and can be used in a
2673 - [`UnsafeCell::get`]
2674 - [`char::is_ascii`]
2676 - [`ManuallyDrop::new`]
2677 - [`ManuallyDrop::into_inner`]
2678 - [`RangeInclusive::start`]
2679 - [`RangeInclusive::end`]
2680 - [`NonNull::as_ptr`]
2683 - [`Duration::as_secs`]
2684 - [`Duration::subsec_millis`]
2685 - [`Duration::subsec_micros`]
2686 - [`Duration::subsec_nanos`]
2688 - [`Ipv4Addr::is_unspecified`]
2690 - [`Ipv6Addr::octets`]
2694 - [`i8::to_be_bytes`]
2695 - [`i8::to_le_bytes`]
2696 - [`i8::to_ne_bytes`]
2697 - [`i8::from_be_bytes`]
2698 - [`i8::from_le_bytes`]
2699 - [`i8::from_ne_bytes`]
2700 - [`i16::to_be_bytes`]
2701 - [`i16::to_le_bytes`]
2702 - [`i16::to_ne_bytes`]
2703 - [`i16::from_be_bytes`]
2704 - [`i16::from_le_bytes`]
2705 - [`i16::from_ne_bytes`]
2706 - [`i32::to_be_bytes`]
2707 - [`i32::to_le_bytes`]
2708 - [`i32::to_ne_bytes`]
2709 - [`i32::from_be_bytes`]
2710 - [`i32::from_le_bytes`]
2711 - [`i32::from_ne_bytes`]
2712 - [`i64::to_be_bytes`]
2713 - [`i64::to_le_bytes`]
2714 - [`i64::to_ne_bytes`]
2715 - [`i64::from_be_bytes`]
2716 - [`i64::from_le_bytes`]
2717 - [`i64::from_ne_bytes`]
2718 - [`i128::to_be_bytes`]
2719 - [`i128::to_le_bytes`]
2720 - [`i128::to_ne_bytes`]
2721 - [`i128::from_be_bytes`]
2722 - [`i128::from_le_bytes`]
2723 - [`i128::from_ne_bytes`]
2724 - [`isize::to_be_bytes`]
2725 - [`isize::to_le_bytes`]
2726 - [`isize::to_ne_bytes`]
2727 - [`isize::from_be_bytes`]
2728 - [`isize::from_le_bytes`]
2729 - [`isize::from_ne_bytes`]
2730 - [`u8::to_be_bytes`]
2731 - [`u8::to_le_bytes`]
2732 - [`u8::to_ne_bytes`]
2733 - [`u8::from_be_bytes`]
2734 - [`u8::from_le_bytes`]
2735 - [`u8::from_ne_bytes`]
2736 - [`u16::to_be_bytes`]
2737 - [`u16::to_le_bytes`]
2738 - [`u16::to_ne_bytes`]
2739 - [`u16::from_be_bytes`]
2740 - [`u16::from_le_bytes`]
2741 - [`u16::from_ne_bytes`]
2742 - [`u32::to_be_bytes`]
2743 - [`u32::to_le_bytes`]
2744 - [`u32::to_ne_bytes`]
2745 - [`u32::from_be_bytes`]
2746 - [`u32::from_le_bytes`]
2747 - [`u32::from_ne_bytes`]
2748 - [`u64::to_be_bytes`]
2749 - [`u64::to_le_bytes`]
2750 - [`u64::to_ne_bytes`]
2751 - [`u64::from_be_bytes`]
2752 - [`u64::from_le_bytes`]
2753 - [`u64::from_ne_bytes`]
2754 - [`u128::to_be_bytes`]
2755 - [`u128::to_le_bytes`]
2756 - [`u128::to_ne_bytes`]
2757 - [`u128::from_be_bytes`]
2758 - [`u128::from_le_bytes`]
2759 - [`u128::from_ne_bytes`]
2760 - [`usize::to_be_bytes`]
2761 - [`usize::to_le_bytes`]
2762 - [`usize::to_ne_bytes`]
2763 - [`usize::from_be_bytes`]
2764 - [`usize::from_le_bytes`]
2765 - [`usize::from_ne_bytes`]
2769 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2770 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2774 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2778 - [The argument types for AVX's
2779 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2780 been changed from `*const` to `*mut` as the previous implementation
2784 [55148]: https://github.com/rust-lang/rust/pull/55148/
2785 [55238]: https://github.com/rust-lang/rust/pull/55238/
2786 [55280]: https://github.com/rust-lang/rust/pull/55280/
2787 [55610]: https://github.com/rust-lang/rust/pull/55610/
2788 [55663]: https://github.com/rust-lang/rust/pull/55663/
2789 [55702]: https://github.com/rust-lang/rust/pull/55702/
2790 [55837]: https://github.com/rust-lang/rust/pull/55837/
2791 [55843]: https://github.com/rust-lang/rust/pull/55843/
2792 [56072]: https://github.com/rust-lang/rust/pull/56072/
2793 [56245]: https://github.com/rust-lang/rust/pull/56245/
2794 [56365]: https://github.com/rust-lang/rust/pull/56365/
2795 [56366]: https://github.com/rust-lang/rust/pull/56366/
2796 [56395]: https://github.com/rust-lang/rust/pull/56395/
2797 [56759]: https://github.com/rust-lang/rust/pull/56759/
2798 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2799 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2800 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2801 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2802 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2803 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2804 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2805 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2806 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2807 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2808 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2809 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2810 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2811 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2812 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2813 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2814 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2815 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2816 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2817 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2818 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2819 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2820 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2821 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2822 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2823 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2824 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2825 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2826 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2827 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2828 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2829 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2830 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2831 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2832 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2833 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2834 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2835 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2836 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2837 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2838 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2839 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2840 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2841 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2842 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2843 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2844 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2845 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2846 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2847 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2848 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2849 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2850 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2851 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2852 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2853 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2854 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2855 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2856 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2857 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2858 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2859 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2860 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2861 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2862 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2863 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2864 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2865 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2866 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2867 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2868 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2869 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2870 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2871 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2872 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2873 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2874 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2875 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2876 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2877 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2878 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2879 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2880 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2881 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2882 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2883 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2884 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2885 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2886 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2887 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2888 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2889 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2890 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2893 Version 1.31.1 (2018-12-20)
2894 ===========================
2896 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2897 - [Fix broken go-to-definition in RLS][rls/1171]
2898 - [Fix infinite loop on hover in RLS][rls/1170]
2900 [56562]: https://github.com/rust-lang/rust/pull/56562
2901 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2902 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2904 Version 1.31.0 (2018-12-06)
2905 ==========================
2909 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2910 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2911 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2912 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2914 - [You can now define and use `const` functions.][54835] These are currently
2915 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2916 [language reference][const-reference] for what exactly is available.
2917 - [You can now use tool lints, which allow you to scope lints from external
2918 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2919 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2920 a crate, not just in exported functions.][54451]
2921 - [You can now use parentheses in pattern matches.][54497]
2925 - [Updated musl to 1.1.20][54430]
2929 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2930 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2931 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2932 into `Option<&mut T>` using the `From` trait.][53218]
2933 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2938 - [`slice::align_to`]
2939 - [`slice::align_to_mut`]
2940 - [`slice::chunks_exact`]
2941 - [`slice::chunks_exact_mut`]
2942 - [`slice::rchunks`]
2943 - [`slice::rchunks_mut`]
2944 - [`slice::rchunks_exact`]
2945 - [`slice::rchunks_exact_mut`]
2946 - [`Option::replace`]
2950 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2951 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2952 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2954 [52813]: https://github.com/rust-lang/rust/pull/52813/
2955 [53218]: https://github.com/rust-lang/rust/pull/53218/
2956 [53555]: https://github.com/rust-lang/rust/issues/53555/
2957 [54057]: https://github.com/rust-lang/rust/pull/54057/
2958 [54240]: https://github.com/rust-lang/rust/pull/54240/
2959 [54430]: https://github.com/rust-lang/rust/pull/54430/
2960 [54451]: https://github.com/rust-lang/rust/pull/54451/
2961 [54497]: https://github.com/rust-lang/rust/pull/54497/
2962 [54778]: https://github.com/rust-lang/rust/pull/54778/
2963 [54835]: https://github.com/rust-lang/rust/pull/54835/
2964 [54870]: https://github.com/rust-lang/rust/pull/54870/
2965 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2966 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2967 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2968 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2969 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2970 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2971 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2972 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2973 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2974 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2975 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2976 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2977 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2978 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2980 Version 1.30.1 (2018-11-08)
2981 ===========================
2983 - [Fixed overflow ICE in rustdoc][54199]
2984 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2986 [54199]: https://github.com/rust-lang/rust/pull/54199
2987 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2989 Version 1.30.0 (2018-10-25)
2990 ==========================
2994 - [Procedural macros are now available.][52081] These kinds of macros allow for
2995 more powerful code generation. There is a [new chapter available][proc-macros]
2996 in the Rust Programming Language book that goes further in depth.
2997 - [You can now use keywords as identifiers using the raw identifiers
2998 syntax (`r#`),][53236] e.g. `let r#for = true;`
2999 - [Using anonymous parameters in traits is now deprecated with a warning and
3000 will be a hard error in the 2018 edition.][53272]
3001 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3002 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3003 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3004 Previously, using a external crate in a module without a use statement
3005 required `let json = ::serde_json::from_str(foo);` but can now be written
3006 as `let json = serde_json::from_str(foo);`.
3007 - [You can now apply the `#[used]` attribute to static items to prevent the
3008 compiler from optimising them away, even if they appear to be unused,][51363]
3009 e.g. `#[used] static FOO: u32 = 1;`
3010 - [You can now import and reexport macros from other crates with the `use`
3011 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3012 the root module of the crate. If your macro relies on calling other local
3013 macros, it is recommended to export with the
3014 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3016 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3017 using the `vis` specifier.][53370]
3018 - [Non-macro attributes now allow all forms of literals, not just
3019 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3020 write `#[attr(true)]`.
3021 - [You can now specify a function to handle a panic in the Rust runtime with the
3022 `#[panic_handler]` attribute.][51366]
3026 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3027 - [Added the `aarch64-unknown-netbsd` target][53165]
3028 - [Upgraded to LLVM 8.][53611]
3032 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3036 - [`Ipv4Addr::BROADCAST`]
3037 - [`Ipv4Addr::LOCALHOST`]
3038 - [`Ipv4Addr::UNSPECIFIED`]
3039 - [`Ipv6Addr::LOCALHOST`]
3040 - [`Ipv6Addr::UNSPECIFIED`]
3041 - [`Iterator::find_map`]
3043 The following methods are replacement methods for `trim_left`, `trim_right`,
3044 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3046 - [`str::trim_end_matches`]
3048 - [`str::trim_start_matches`]
3049 - [`str::trim_start`]
3053 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3054 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3055 equivalent to calling `rustdoc --error-format=json`.
3056 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3060 - [`rustdoc` allows you to specify what edition to treat your code as with the
3061 `--edition` option.][54057]
3062 - [`rustdoc` now has the `--color` (specify whether to output color) and
3063 `--error-format` (specify error format, e.g. `json`) options.][53003]
3064 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3065 debug symbols.][53774]
3066 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3067 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3069 [50911]: https://github.com/rust-lang/rust/pull/50911/
3070 [51363]: https://github.com/rust-lang/rust/pull/51363/
3071 [51366]: https://github.com/rust-lang/rust/pull/51366/
3072 [52081]: https://github.com/rust-lang/rust/pull/52081/
3073 [53003]: https://github.com/rust-lang/rust/pull/53003/
3074 [53033]: https://github.com/rust-lang/rust/pull/53033/
3075 [53044]: https://github.com/rust-lang/rust/pull/53044/
3076 [53165]: https://github.com/rust-lang/rust/pull/53165/
3077 [53611]: https://github.com/rust-lang/rust/pull/53611/
3078 [53213]: https://github.com/rust-lang/rust/pull/53213/
3079 [53236]: https://github.com/rust-lang/rust/pull/53236/
3080 [53272]: https://github.com/rust-lang/rust/pull/53272/
3081 [53370]: https://github.com/rust-lang/rust/pull/53370/
3082 [53459]: https://github.com/rust-lang/rust/pull/53459/
3083 [53774]: https://github.com/rust-lang/rust/pull/53774/
3084 [53822]: https://github.com/rust-lang/rust/pull/53822/
3085 [54057]: https://github.com/rust-lang/rust/pull/54057/
3086 [54146]: https://github.com/rust-lang/rust/pull/54146/
3087 [54404]: https://github.com/rust-lang/rust/pull/54404/
3088 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3089 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3090 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3091 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3093 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3094 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3095 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3096 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3097 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3098 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3099 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3100 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3101 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3102 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3105 Version 1.29.2 (2018-10-11)
3106 ===========================
3108 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3109 - The `rls-preview` component on the windows-gnu targets has been restored.
3111 [54639]: https://github.com/rust-lang/rust/pull/54639
3114 Version 1.29.1 (2018-09-25)
3115 ===========================
3120 - The standard library's `str::repeat` function contained an out of bounds write
3121 caused by an integer overflow. This has been fixed by deterministically
3122 panicking when an overflow happens.
3124 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3128 Version 1.29.0 (2018-09-13)
3129 ==========================
3133 - [Bumped minimum LLVM version to 5.0.][51899]
3134 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3135 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3136 - [Upgraded to LLVM 7.][51966]
3140 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3141 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3142 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3143 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3145 - [`Cell<T>` now allows `T` to be unsized.][50494]
3146 - [`SocketAddr` is now stable on Redox.][52656]
3151 - [`Iterator::flatten`]
3156 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3157 `--locked` to disable this behavior.
3158 - [`cargo-install` will now allow you to cross compile an install
3159 using `--target`.][cargo/5614]
3160 - [Added the `cargo-fix` subcommand to automatically move project code from
3161 2015 edition to 2018.][cargo/5723]
3162 - [`cargo doc` can now optionally document private types using the
3163 `--document-private-items` flag.][cargo/5543]
3167 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3168 the specified level to that level.][52354] For example `--cap-lints warn`
3169 will demote `deny` and `forbid` lints to `warn`.
3170 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3171 fails and `101` if there is a panic.][52197]
3172 - [A preview of clippy has been made available through rustup.][51122]
3173 You can install the preview with `rustup component add clippy-preview`.
3177 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3178 Use `str::get_unchecked(begin..end)` instead.
3179 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3180 Consider using the `home_dir` function from
3181 https://crates.io/crates/dirs instead.
3182 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3183 - [`cfg` attributes and `--cfg` command line flags are now more
3184 strictly validated.][53893]
3186 [53893]: https://github.com/rust-lang/rust/pull/53893/
3187 [52861]: https://github.com/rust-lang/rust/pull/52861/
3188 [51966]: https://github.com/rust-lang/rust/pull/51966/
3189 [52656]: https://github.com/rust-lang/rust/pull/52656/
3190 [52239]: https://github.com/rust-lang/rust/pull/52239/
3191 [52330]: https://github.com/rust-lang/rust/pull/52330/
3192 [52354]: https://github.com/rust-lang/rust/pull/52354/
3193 [52402]: https://github.com/rust-lang/rust/pull/52402/
3194 [52103]: https://github.com/rust-lang/rust/pull/52103/
3195 [52197]: https://github.com/rust-lang/rust/pull/52197/
3196 [51807]: https://github.com/rust-lang/rust/pull/51807/
3197 [51899]: https://github.com/rust-lang/rust/pull/51899/
3198 [51912]: https://github.com/rust-lang/rust/pull/51912/
3199 [51511]: https://github.com/rust-lang/rust/pull/51511/
3200 [51619]: https://github.com/rust-lang/rust/pull/51619/
3201 [51656]: https://github.com/rust-lang/rust/pull/51656/
3202 [51178]: https://github.com/rust-lang/rust/pull/51178/
3203 [51122]: https://github.com/rust-lang/rust/pull/51122
3204 [50494]: https://github.com/rust-lang/rust/pull/50494/
3205 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3206 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3207 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3208 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3209 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3210 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3211 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3214 Version 1.28.0 (2018-08-02)
3215 ===========================
3219 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3220 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3221 the inner type across Foreign Function Interface (FFI) boundaries.
3222 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3223 and can now be used as identifiers.][51196]
3224 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3225 stable.][51241] This will allow users to specify a global allocator for
3227 - [Unit test functions marked with the `#[test]` attribute can now return
3228 `Result<(), E: Debug>` in addition to `()`.][51298]
3229 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3230 allows macros to easily target lifetimes.
3234 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3235 prioritise making smaller binary sizes. `z` is the same as `s` with the
3236 exception that it does not vectorise loops, which typically results in an even
3238 - [The short error format is now stable.][49546] Specified with
3239 `--error-format=short` this option will provide a more compressed output of
3240 rust error messages.
3241 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3242 - [Reduced the number of allocations in the macro parser.][50855] This can
3243 improve compile times of macro heavy crates on average by 5%.
3247 - [Implemented `Default` for `&mut str`.][51306]
3248 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3249 - [Implemented `Extend` for `()`.][50234]
3250 - [The `Debug` implementation of `time::Duration` should now be more easily
3251 human readable.][50364] Previously a `Duration` of one second would printed as
3252 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3253 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3254 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3255 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3256 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3257 for `PathBuf`.][50170]
3258 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3259 and `Wrapping<i128>`.][50465]
3260 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3261 possible.][51050] This can provide up to a 40% speed increase.
3262 - [Improved error messages when using `format!`.][50610]
3266 - [`Iterator::step_by`]
3267 - [`Path::ancestors`]
3268 - [`SystemTime::UNIX_EPOCH`]
3269 - [`alloc::GlobalAlloc`]
3271 - [`alloc::LayoutErr`]
3274 - [`alloc::alloc_zeroed`]
3275 - [`alloc::dealloc`]
3276 - [`alloc::realloc`]
3277 - [`alloc::handle_alloc_error`]
3278 - [`btree_map::Entry::or_default`]
3279 - [`fmt::Alignment`]
3280 - [`hash_map::Entry::or_default`]
3281 - [`iter::repeat_with`]
3282 - [`num::NonZeroUsize`]
3283 - [`num::NonZeroU128`]
3284 - [`num::NonZeroU16`]
3285 - [`num::NonZeroU32`]
3286 - [`num::NonZeroU64`]
3287 - [`num::NonZeroU8`]
3288 - [`ops::RangeBounds`]
3289 - [`slice::SliceIndex`]
3290 - [`slice::from_mut`]
3291 - [`slice::from_ref`]
3292 - [`{Any + Send + Sync}::downcast_mut`]
3293 - [`{Any + Send + Sync}::downcast_ref`]
3294 - [`{Any + Send + Sync}::is`]
3298 - [Cargo will now no longer allow you to publish crates with build scripts that
3299 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3300 considered to be immutable.
3304 - [The `suggestion_applicability` field in `rustc`'s json output is now
3305 stable.][50486] This will allow dev tools to check whether a code suggestion
3306 would apply to them.
3310 - [Rust will consider trait objects with duplicated constraints to be the same
3311 type as without the duplicated constraint.][51276] For example the below code will
3312 now fail to compile.
3317 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3320 impl Trait + Send + Send {
3321 fn test(&self) { println!("two"); }
3325 [49546]: https://github.com/rust-lang/rust/pull/49546/
3326 [50143]: https://github.com/rust-lang/rust/pull/50143/
3327 [50170]: https://github.com/rust-lang/rust/pull/50170/
3328 [50234]: https://github.com/rust-lang/rust/pull/50234/
3329 [50265]: https://github.com/rust-lang/rust/pull/50265/
3330 [50364]: https://github.com/rust-lang/rust/pull/50364/
3331 [50385]: https://github.com/rust-lang/rust/pull/50385/
3332 [50465]: https://github.com/rust-lang/rust/pull/50465/
3333 [50486]: https://github.com/rust-lang/rust/pull/50486/
3334 [50554]: https://github.com/rust-lang/rust/pull/50554/
3335 [50610]: https://github.com/rust-lang/rust/pull/50610/
3336 [50855]: https://github.com/rust-lang/rust/pull/50855/
3337 [51050]: https://github.com/rust-lang/rust/pull/51050/
3338 [51196]: https://github.com/rust-lang/rust/pull/51196/
3339 [51200]: https://github.com/rust-lang/rust/pull/51200/
3340 [51241]: https://github.com/rust-lang/rust/pull/51241/
3341 [51276]: https://github.com/rust-lang/rust/pull/51276/
3342 [51298]: https://github.com/rust-lang/rust/pull/51298/
3343 [51306]: https://github.com/rust-lang/rust/pull/51306/
3344 [51562]: https://github.com/rust-lang/rust/pull/51562/
3345 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3346 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3347 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3348 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3349 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3350 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3351 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3352 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3353 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3354 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3355 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3356 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3357 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3358 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3359 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3360 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3361 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3362 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3363 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3364 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3365 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3366 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3367 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3368 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3369 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3370 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3371 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3372 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3373 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3374 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3376 Version 1.27.2 (2018-07-20)
3377 ===========================
3382 - The borrow checker was fixed to avoid potential unsoundness when using
3383 match ergonomics: [#52213][52213].
3385 [52213]: https://github.com/rust-lang/rust/issues/52213
3387 Version 1.27.1 (2018-07-10)
3388 ===========================
3393 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3394 when running, which enabled executing code as some other user on a
3395 given machine. This release fixes that vulnerability; you can read
3396 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3398 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3403 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3404 match ergonomics: [#51415][51415], [#49534][49534].
3406 [51415]: https://github.com/rust-lang/rust/issues/51415
3407 [49534]: https://github.com/rust-lang/rust/issues/49534
3408 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3409 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3411 Version 1.27.0 (2018-06-21)
3412 ==========================
3416 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3417 be used as an identifier.
3418 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3419 bare `Trait` syntax, and should make it clearer when being used in tandem with
3420 `impl Trait` because it is equivalent to the following syntax:
3421 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3422 `Box<Trait> == Box<dyn Trait>`.
3423 - [Attributes on generic parameters such as types and lifetimes are
3424 now stable.][48851] e.g.
3425 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3426 - [The `#[must_use]` attribute can now also be used on functions as well as
3427 types.][48925] It provides a lint that by default warns users when the
3428 value returned by a function has not been used.
3432 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3436 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3437 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3438 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3439 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3440 the `cfg` attribute.
3441 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3442 std are now available in core.][49896]
3443 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3445 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3446 that the operation isn't done in place.
3447 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3448 the `#[must_use]` attribute][49533] to warn about unused potentially
3449 expensive allocations.
3453 - [`DoubleEndedIterator::rfind`]
3454 - [`DoubleEndedIterator::rfold`]
3455 - [`DoubleEndedIterator::try_rfold`]
3456 - [`Duration::from_micros`]
3457 - [`Duration::from_nanos`]
3458 - [`Duration::subsec_micros`]
3459 - [`Duration::subsec_millis`]
3460 - [`HashMap::remove_entry`]
3461 - [`Iterator::try_fold`]
3462 - [`Iterator::try_for_each`]
3464 - [`Option::filter`]
3465 - [`String::replace_range`]
3466 - [`Take::set_limit`]
3467 - [`hint::unreachable_unchecked`]
3468 - [`os::unix::process::parent_id`]
3469 - [`ptr::swap_nonoverlapping`]
3470 - [`slice::rsplit_mut`]
3472 - [`slice::swap_with_slice`]
3476 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3477 `readme`, and `repository` fields.][cargo/5386]
3478 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3479 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3480 a different directory than `target` for placing compilation artifacts.
3481 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3482 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3483 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3484 where cargo would infer a binary, Cargo will produce a warning. You can
3485 disable this feature ahead of time by setting any of the following to false:
3486 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3487 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3488 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3492 - [Added “The Rustc book” into the official documentation.][49707]
3493 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3494 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3498 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3499 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3500 compile, `"".is_empty()` will still compile.
3501 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3502 will only print the inner type.][48553] E.g.
3503 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3504 not `AtomicBool(true)`.
3505 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3506 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3507 alignment should cover all use cases.
3508 - The `.description()` method on the `std::error::Error` trait
3509 [has been soft-deprecated][50163]. It is no longer required to implement it.
3511 [48553]: https://github.com/rust-lang/rust/pull/48553/
3512 [48851]: https://github.com/rust-lang/rust/pull/48851/
3513 [48925]: https://github.com/rust-lang/rust/pull/48925/
3514 [49533]: https://github.com/rust-lang/rust/pull/49533/
3515 [49623]: https://github.com/rust-lang/rust/pull/49623/
3516 [49630]: https://github.com/rust-lang/rust/pull/49630/
3517 [49664]: https://github.com/rust-lang/rust/pull/49664/
3518 [49699]: https://github.com/rust-lang/rust/pull/49699/
3519 [49707]: https://github.com/rust-lang/rust/pull/49707/
3520 [49719]: https://github.com/rust-lang/rust/pull/49719/
3521 [49896]: https://github.com/rust-lang/rust/pull/49896/
3522 [49968]: https://github.com/rust-lang/rust/pull/49968/
3523 [50163]: https://github.com/rust-lang/rust/pull/50163
3524 [50177]: https://github.com/rust-lang/rust/pull/50177/
3525 [50378]: https://github.com/rust-lang/rust/pull/50378/
3526 [50398]: https://github.com/rust-lang/rust/pull/50398/
3527 [50423]: https://github.com/rust-lang/rust/pull/50423/
3528 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3529 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3530 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3531 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3532 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3533 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3534 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3535 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3536 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3537 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3538 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3539 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3540 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3541 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3542 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3543 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3544 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3545 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3546 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3547 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3548 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3549 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3550 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3551 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3552 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3553 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3554 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3555 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3556 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3557 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3560 Version 1.26.2 (2018-06-05)
3561 ==========================
3566 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3568 [51117]: https://github.com/rust-lang/rust/issues/51117
3571 Version 1.26.1 (2018-05-29)
3572 ==========================
3577 - [RLS now works on Windows.][50646]
3578 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3584 - [`fn main() -> impl Trait` no longer works for non-Termination
3586 This reverts an accidental stabilization.
3587 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3588 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3590 [50646]: https://github.com/rust-lang/rust/issues/50646
3591 [50656]: https://github.com/rust-lang/rust/pull/50656
3592 [50812]: https://github.com/rust-lang/rust/pull/50812
3593 [50950]: https://github.com/rust-lang/rust/issues/50950
3594 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3596 Version 1.26.0 (2018-05-10)
3597 ==========================
3601 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3602 implement either or both traits.][49299]
3603 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3604 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3605 lifetime can be elided.][49458]
3606 - [`impl Trait` is now stable allowing you to have abstract types in returns
3607 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3608 `fn open(path: impl AsRef<Path>)`.
3609 - [Pattern matching will now automatically apply dereferences.][49394]
3610 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3611 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3612 - [A lot of operations are now available in a const context.][46882] E.g. You
3613 can now index into constant arrays, reference and dereference into constants,
3614 and use tuple struct constructors.
3615 - [Fixed entry slice patterns are now stable.][48516] E.g.
3617 let points = [1, 2, 3, 4];
3619 [1, 2, 3, 4] => println!("All points were sequential."),
3620 _ => println!("Not all points were sequential."),
3627 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3628 - [Fixed exponential projection complexity on nested types.][48296]
3629 This can provide up to a ~12% reduction in compile times for certain crates.
3630 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3631 to remap path prefixes outputted by the compiler.
3632 - [Added `powerpc-unknown-netbsd` target.][48281]
3636 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3637 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3638 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3639 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3640 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3641 - [`ascii::escape_default` is now available in libcore.][48735]
3642 - [Trailing commas are now supported in std and core macros.][48056]
3643 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3644 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3649 - [`*const T::copy_to_nonoverlapping`]
3650 - [`*const T::copy_to`]
3651 - [`*const T::read_unaligned`]
3652 - [`*const T::read_volatile`]
3653 - [`*const T::read`]
3655 - [`*const T::wrapping_add`]
3656 - [`*const T::wrapping_sub`]
3658 - [`*mut T::copy_to_nonoverlapping`]
3659 - [`*mut T::copy_to`]
3660 - [`*mut T::read_unaligned`]
3661 - [`*mut T::read_volatile`]
3663 - [`*mut T::replace`]
3666 - [`*mut T::wrapping_add`]
3667 - [`*mut T::wrapping_sub`]
3668 - [`*mut T::write_bytes`]
3669 - [`*mut T::write_unaligned`]
3670 - [`*mut T::write_volatile`]
3673 - [`FromUtf8Error::as_bytes`]
3674 - [`LocalKey::try_with`]
3675 - [`Option::cloned`]
3676 - [`btree_map::Entry::and_modify`]
3677 - [`fs::read_to_string`]
3680 - [`hash_map::Entry::and_modify`]
3681 - [`iter::FusedIterator`]
3682 - [`ops::RangeInclusive`]
3683 - [`ops::RangeToInclusive`]
3685 - [`slice::rotate_left`]
3686 - [`slice::rotate_right`]
3687 - [`String::retain`]
3692 - [Cargo will now output path to custom commands when `-v` is
3693 passed with `--list`][cargo/5041]
3694 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3698 - [The second edition of "The Rust Programming Language" book is now recommended
3699 over the first.][48404]
3704 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3705 syntax is now invalid.
3707 use std::ops::Fn as dyn;
3708 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3710 - [The result of dereferences are no longer promoted to `'static`.][47408]
3714 const PAIR: &(i32, i32) = &(0, 1);
3715 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3718 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3719 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3721 - [Removed hoedown from rustdoc.][48274]
3722 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3724 [46882]: https://github.com/rust-lang/rust/pull/46882
3725 [47379]: https://github.com/rust-lang/rust/pull/47379
3726 [47408]: https://github.com/rust-lang/rust/pull/47408
3727 [47813]: https://github.com/rust-lang/rust/pull/47813
3728 [48056]: https://github.com/rust-lang/rust/pull/48056
3729 [48125]: https://github.com/rust-lang/rust/pull/48125
3730 [48166]: https://github.com/rust-lang/rust/pull/48166
3731 [48235]: https://github.com/rust-lang/rust/pull/48235
3732 [48274]: https://github.com/rust-lang/rust/pull/48274
3733 [48281]: https://github.com/rust-lang/rust/pull/48281
3734 [48296]: https://github.com/rust-lang/rust/pull/48296
3735 [48326]: https://github.com/rust-lang/rust/pull/48326
3736 [48359]: https://github.com/rust-lang/rust/pull/48359
3737 [48404]: https://github.com/rust-lang/rust/pull/48404
3738 [48481]: https://github.com/rust-lang/rust/pull/48481
3739 [48516]: https://github.com/rust-lang/rust/pull/48516
3740 [48628]: https://github.com/rust-lang/rust/pull/48628
3741 [48629]: https://github.com/rust-lang/rust/pull/48629
3742 [48657]: https://github.com/rust-lang/rust/pull/48657
3743 [48735]: https://github.com/rust-lang/rust/pull/48735
3744 [48978]: https://github.com/rust-lang/rust/pull/48978
3745 [49101]: https://github.com/rust-lang/rust/pull/49101
3746 [49109]: https://github.com/rust-lang/rust/pull/49109
3747 [49121]: https://github.com/rust-lang/rust/pull/49121
3748 [49162]: https://github.com/rust-lang/rust/pull/49162
3749 [49184]: https://github.com/rust-lang/rust/pull/49184
3750 [49234]: https://github.com/rust-lang/rust/pull/49234
3751 [49255]: https://github.com/rust-lang/rust/pull/49255
3752 [49299]: https://github.com/rust-lang/rust/pull/49299
3753 [49305]: https://github.com/rust-lang/rust/pull/49305
3754 [49394]: https://github.com/rust-lang/rust/pull/49394
3755 [49458]: https://github.com/rust-lang/rust/pull/49458
3756 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3757 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3758 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3759 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3760 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3761 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3762 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3763 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3764 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3765 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3766 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3767 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3768 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3769 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3770 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3771 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3772 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3773 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3774 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3775 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3776 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3777 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3778 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3779 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3780 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3781 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3782 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3783 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3784 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3785 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3786 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3787 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3788 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3789 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3790 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3791 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3792 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3793 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3794 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3795 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3796 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3797 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3800 Version 1.25.0 (2018-03-29)
3801 ==========================
3805 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3806 - [You can now use nested groups of imports.][47948]
3807 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3808 - [You can now have `|` at the start of a match arm.][47947] e.g.
3810 enum Foo { A, B, C }
3816 | Foo::B => println!("AB"),
3817 | Foo::C => println!("C"),
3824 - [Upgraded to LLVM 6.][47828]
3825 - [Added `-C lto=val` option.][47521]
3826 - [Added `i586-unknown-linux-musl` target][47282]
3830 - [Impl Send for `process::Command` on Unix.][47760]
3831 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3832 - [`UnsafeCell::into_inner` is now safe.][47204]
3833 - [Implement libstd for CloudABI.][47268]
3834 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3835 - [Implement `AsRef<Path>` for Component][46985]
3836 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3837 - [Moved `Duration` to libcore.][46666]
3841 - [`Location::column`]
3844 The following functions can now be used in a constant expression.
3845 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3846 - [`Duration::new`][47300]
3847 - [`Duration::from_secs`][47300]
3848 - [`Duration::from_millis`][47300]
3852 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3853 - [`cargo new` now defaults to creating a binary crate, instead of a
3854 library crate.][cargo/5029]
3858 - [Rust by example is now shipped with new releases][46196]
3862 - [Deprecated `net::lookup_host`.][47510]
3863 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3864 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3865 around indexing operations (see [#47349][47349]). This has been fixed (which also
3866 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3867 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3869 [33903]: https://github.com/rust-lang/rust/pull/33903
3870 [47947]: https://github.com/rust-lang/rust/pull/47947
3871 [47948]: https://github.com/rust-lang/rust/pull/47948
3872 [47760]: https://github.com/rust-lang/rust/pull/47760
3873 [47790]: https://github.com/rust-lang/rust/pull/47790
3874 [47828]: https://github.com/rust-lang/rust/pull/47828
3875 [47398]: https://github.com/rust-lang/rust/pull/47398
3876 [47510]: https://github.com/rust-lang/rust/pull/47510
3877 [47521]: https://github.com/rust-lang/rust/pull/47521
3878 [47204]: https://github.com/rust-lang/rust/pull/47204
3879 [47251]: https://github.com/rust-lang/rust/pull/47251
3880 [47268]: https://github.com/rust-lang/rust/pull/47268
3881 [47282]: https://github.com/rust-lang/rust/pull/47282
3882 [47300]: https://github.com/rust-lang/rust/pull/47300
3883 [47349]: https://github.com/rust-lang/rust/pull/47349
3884 [46931]: https://github.com/rust-lang/rust/pull/46931
3885 [46985]: https://github.com/rust-lang/rust/pull/46985
3886 [47006]: https://github.com/rust-lang/rust/pull/47006
3887 [46830]: https://github.com/rust-lang/rust/pull/46830
3888 [46095]: https://github.com/rust-lang/rust/pull/46095
3889 [46666]: https://github.com/rust-lang/rust/pull/46666
3890 [46196]: https://github.com/rust-lang/rust/pull/46196
3891 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3892 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3893 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3894 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3895 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3898 Version 1.24.1 (2018-03-01)
3899 ==========================
3901 - [Do not abort when unwinding through FFI][48251]
3902 - [Emit UTF-16 files for linker arguments on Windows][48318]
3903 - [Make the error index generator work again][48308]
3904 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3906 [48251]: https://github.com/rust-lang/rust/issues/48251
3907 [48308]: https://github.com/rust-lang/rust/issues/48308
3908 [48318]: https://github.com/rust-lang/rust/issues/48318
3909 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3912 Version 1.24.0 (2018-02-15)
3913 ==========================
3917 - [External `sysv64` ffi is now available.][46528]
3918 eg. `extern "sysv64" fn foo () {}`
3922 - [rustc now uses 16 codegen units by default for release builds.][46910]
3923 For the fastest builds, utilize `codegen-units=1`.
3924 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3925 - [Add `aarch64-unknown-openbsd` support][46760]
3929 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3930 improvement in performance in the majority of cases.
3931 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3932 with Windows.][46798]
3933 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3934 - [impl `From<bool>` for `AtomicBool`][46293]
3935 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3936 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3937 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3938 - [float::from_bits now just uses transmute.][46012] This provides
3939 some optimisations from LLVM.
3940 - [Copied `AsciiExt` methods onto `char`][46077]
3941 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3942 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3943 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3944 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3948 - [`RefCell::replace`]
3950 - [`atomic::spin_loop_hint`]
3952 The following functions can now be used in a constant expression.
3953 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3955 - [`AtomicBool::new`][46287]
3956 - [`AtomicUsize::new`][46287]
3957 - [`AtomicIsize::new`][46287]
3958 - [`AtomicPtr::new`][46287]
3959 - [`Cell::new`][46287]
3960 - [`{integer}::min_value`][46287]
3961 - [`{integer}::max_value`][46287]
3962 - [`mem::size_of`][46287]
3963 - [`mem::align_of`][46287]
3964 - [`ptr::null`][46287]
3965 - [`ptr::null_mut`][46287]
3966 - [`RefCell::new`][46287]
3967 - [`UnsafeCell::new`][46287]
3971 - [Added a `workspace.default-members` config that
3972 overrides implied `--all` in virtual workspaces.][cargo/4743]
3973 - [Enable incremental by default on development builds.][cargo/4817] Also added
3974 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3975 per-project or global basis respectively.
3982 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3983 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3984 in accordance with IETF RFC 4291 §2.2.
3985 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3986 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3987 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3988 - [Leading zeros in tuple struct members is now an error][47084]
3989 - [`column!()` macro is one-based instead of zero-based][46977]
3990 - [`fmt::Arguments` can no longer be shared across threads][45198]
3991 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3992 - [Cargo sets a different working directory for the compiler][cargo/4788]
3994 [44884]: https://github.com/rust-lang/rust/pull/44884
3995 [45198]: https://github.com/rust-lang/rust/pull/45198
3996 [45506]: https://github.com/rust-lang/rust/pull/45506
3997 [45904]: https://github.com/rust-lang/rust/pull/45904
3998 [45990]: https://github.com/rust-lang/rust/pull/45990
3999 [46012]: https://github.com/rust-lang/rust/pull/46012
4000 [46077]: https://github.com/rust-lang/rust/pull/46077
4001 [46094]: https://github.com/rust-lang/rust/pull/46094
4002 [46284]: https://github.com/rust-lang/rust/pull/46284
4003 [46287]: https://github.com/rust-lang/rust/pull/46287
4004 [46293]: https://github.com/rust-lang/rust/pull/46293
4005 [46528]: https://github.com/rust-lang/rust/pull/46528
4006 [46671]: https://github.com/rust-lang/rust/pull/46671
4007 [46713]: https://github.com/rust-lang/rust/pull/46713
4008 [46735]: https://github.com/rust-lang/rust/pull/46735
4009 [46749]: https://github.com/rust-lang/rust/pull/46749
4010 [46760]: https://github.com/rust-lang/rust/pull/46760
4011 [46798]: https://github.com/rust-lang/rust/pull/46798
4012 [46828]: https://github.com/rust-lang/rust/pull/46828
4013 [46831]: https://github.com/rust-lang/rust/pull/46831
4014 [46833]: https://github.com/rust-lang/rust/pull/46833
4015 [46910]: https://github.com/rust-lang/rust/pull/46910
4016 [46977]: https://github.com/rust-lang/rust/pull/46977
4017 [47018]: https://github.com/rust-lang/rust/pull/47018
4018 [47080]: https://github.com/rust-lang/rust/pull/47080
4019 [47084]: https://github.com/rust-lang/rust/pull/47084
4020 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4021 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4022 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4023 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4024 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4025 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4028 Version 1.23.0 (2018-01-04)
4029 ==========================
4033 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4034 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4035 Which should fix some confusing errors in some operations.
4039 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4040 undefined behavior.][45920]
4041 - [rustc now suggests renaming import if names clash.][45660]
4042 - [Display errors/warnings correctly when there are zero-width or
4043 wide characters.][45711]
4044 - [rustc now avoids unnecessary copies of arguments that are
4045 simple bindings][45380] This should improve memory usage on average by 5-10%.
4046 - [Updated musl used to build musl rustc to 1.1.17][45393]
4050 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4051 - [Implement Hash for raw pointers to unsized types][45483]
4052 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4053 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4054 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4055 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4056 and `<*mut T>::as_mut`][44932]
4057 - [Optimized `Thread::{park, unpark}` implementation][45524]
4058 - [Improved `SliceExt::binary_search` performance.][45333]
4059 - [impl `FromIterator<()>` for `()`][45379]
4060 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4068 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4069 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4070 - [Added unit test checking to `cargo check`][cargo/4592]
4071 - [Cargo now lets you install a specific version
4072 using `cargo install --version`][cargo/4637]
4076 - [Releases now ship with the Cargo book documentation.][45692]
4077 - [rustdoc now prints rendering warnings on every run.][45324]
4081 - [Changes have been made to type equality to make it more correct,
4082 in rare cases this could break some code.][45853] [Tracking issue for
4083 further information][45852]
4084 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4085 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4086 Android 9, the minimum supported version is Android 14.
4087 - [Bumped the minimum LLVM to 3.9][45326]
4089 [44042]: https://github.com/rust-lang/rust/pull/44042
4090 [44932]: https://github.com/rust-lang/rust/pull/44932
4091 [45267]: https://github.com/rust-lang/rust/pull/45267
4092 [45324]: https://github.com/rust-lang/rust/pull/45324
4093 [45326]: https://github.com/rust-lang/rust/pull/45326
4094 [45333]: https://github.com/rust-lang/rust/pull/45333
4095 [45379]: https://github.com/rust-lang/rust/pull/45379
4096 [45380]: https://github.com/rust-lang/rust/pull/45380
4097 [45393]: https://github.com/rust-lang/rust/pull/45393
4098 [45435]: https://github.com/rust-lang/rust/pull/45435
4099 [45483]: https://github.com/rust-lang/rust/pull/45483
4100 [45524]: https://github.com/rust-lang/rust/pull/45524
4101 [45571]: https://github.com/rust-lang/rust/pull/45571
4102 [45580]: https://github.com/rust-lang/rust/pull/45580
4103 [45610]: https://github.com/rust-lang/rust/pull/45610
4104 [45660]: https://github.com/rust-lang/rust/pull/45660
4105 [45692]: https://github.com/rust-lang/rust/pull/45692
4106 [45711]: https://github.com/rust-lang/rust/pull/45711
4107 [45772]: https://github.com/rust-lang/rust/pull/45772
4108 [45852]: https://github.com/rust-lang/rust/issues/45852
4109 [45853]: https://github.com/rust-lang/rust/pull/45853
4110 [45887]: https://github.com/rust-lang/rust/pull/45887
4111 [45920]: https://github.com/rust-lang/rust/pull/45920
4112 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4113 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4114 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4117 Version 1.22.1 (2017-11-22)
4118 ==========================
4120 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4122 [46183]: https://github.com/rust-lang/rust/pull/46183
4124 Version 1.22.0 (2017-11-22)
4125 ==========================
4129 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4130 - [Now accepts underscores in unicode escapes][43716]
4131 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4132 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4136 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4137 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4138 This should decrease compile times for debug builds.
4139 - [strict memory alignment now enabled on ARMv6][45094]
4140 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4144 - [Allow atomic operations up to 32 bits
4145 on `armv5te_unknown_linux_gnueabi`][44978]
4146 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4147 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4148 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4149 - [Properly detect overflow in `Instant += Duration`.][44220]
4150 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4151 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4152 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4159 - [Cargo will now build multi file examples in subdirectories of the `examples`
4160 folder that have a `main.rs` file.][cargo/4496]
4161 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4162 the old format will continue to work and can be updated with `cargo update`.
4163 - [Now supports vendoring git repositories][cargo/3992]
4167 - [`libbacktrace` is now available on Apple platforms.][44251]
4168 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4169 This now lets you specify that a given code example will fail to compile.
4173 - [The minimum Android version that rustc can build for has been bumped
4174 to `4.0` from `2.3`][45656]
4175 - [Allowing `T op= &T` for numeric types has broken some type
4176 inference cases][45480]
4179 [42526]: https://github.com/rust-lang/rust/pull/42526
4180 [43017]: https://github.com/rust-lang/rust/pull/43017
4181 [43716]: https://github.com/rust-lang/rust/pull/43716
4182 [43949]: https://github.com/rust-lang/rust/pull/43949
4183 [44015]: https://github.com/rust-lang/rust/pull/44015
4184 [44220]: https://github.com/rust-lang/rust/pull/44220
4185 [44251]: https://github.com/rust-lang/rust/pull/44251
4186 [44287]: https://github.com/rust-lang/rust/pull/44287
4187 [44303]: https://github.com/rust-lang/rust/pull/44303
4188 [44456]: https://github.com/rust-lang/rust/pull/44456
4189 [44466]: https://github.com/rust-lang/rust/pull/44466
4190 [44895]: https://github.com/rust-lang/rust/pull/44895
4191 [44966]: https://github.com/rust-lang/rust/pull/44966
4192 [44978]: https://github.com/rust-lang/rust/pull/44978
4193 [45041]: https://github.com/rust-lang/rust/pull/45041
4194 [45064]: https://github.com/rust-lang/rust/pull/45064
4195 [45075]: https://github.com/rust-lang/rust/pull/45075
4196 [45094]: https://github.com/rust-lang/rust/pull/45094
4197 [45095]: https://github.com/rust-lang/rust/pull/45095
4198 [45480]: https://github.com/rust-lang/rust/issues/45480
4199 [45656]: https://github.com/rust-lang/rust/pull/45656
4200 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4201 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4202 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4209 Version 1.21.0 (2017-10-12)
4210 ==========================
4214 - [You can now use static references for literals.][43838]
4218 let x: &'static u32 = &0;
4221 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4224 my_macro!(Vec<i32>::new); // Always worked
4225 my_macro!(Vec::<i32>::new); // Now works
4230 - [Upgraded jemalloc to 4.5.0][43911]
4231 - [Enabled unwinding panics on Redox][43917]
4232 - [Now runs LLVM in parallel during translation phase.][43506]
4233 This should reduce peak memory usage.
4237 - [Generate builtin impls for `Clone` for all arrays and tuples that
4238 are `T: Clone`][43690]
4239 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4240 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4241 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4246 [`std::mem::discriminant`]
4250 - [You can now call `cargo install` with multiple package names][cargo/4216]
4251 - [Cargo commands inside a virtual workspace will now implicitly
4252 pass `--all`][cargo/4335]
4253 - [Added a `[patch]` section to `Cargo.toml` to handle
4254 prepublication dependencies][cargo/4123] [RFC 1969]
4255 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4256 like patterns][cargo/4270]
4257 - [Added the `--all-targets` option][cargo/4400]
4258 - [Using required dependencies as a feature is now deprecated and emits
4259 a warning][cargo/4364]
4264 - [Cargo docs are moving][43916]
4265 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4266 - [The rustdoc book is now available][43863]
4267 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4268 - [Added a preview of RLS has been made available through rustup][44204]
4269 Install with `rustup component add rls-preview`
4270 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4271 Previously only showed `std::os::unix`.
4275 - [Changes in method matching against higher-ranked types][43880] This may cause
4276 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4277 - [rustc's JSON error output's byte position start at top of file.][42973]
4278 Was previously relative to the rustc's internal `CodeMap` struct which
4279 required the unstable library `libsyntax` to correctly use.
4280 - [`unused_results` lint no longer ignores booleans][43728]
4282 [42565]: https://github.com/rust-lang/rust/pull/42565
4283 [42973]: https://github.com/rust-lang/rust/pull/42973
4284 [43348]: https://github.com/rust-lang/rust/pull/43348
4285 [43459]: https://github.com/rust-lang/rust/pull/43459
4286 [43506]: https://github.com/rust-lang/rust/pull/43506
4287 [43540]: https://github.com/rust-lang/rust/pull/43540
4288 [43690]: https://github.com/rust-lang/rust/pull/43690
4289 [43728]: https://github.com/rust-lang/rust/pull/43728
4290 [43838]: https://github.com/rust-lang/rust/pull/43838
4291 [43863]: https://github.com/rust-lang/rust/pull/43863
4292 [43880]: https://github.com/rust-lang/rust/pull/43880
4293 [43911]: https://github.com/rust-lang/rust/pull/43911
4294 [43916]: https://github.com/rust-lang/rust/pull/43916
4295 [43917]: https://github.com/rust-lang/rust/pull/43917
4296 [44204]: https://github.com/rust-lang/rust/pull/44204
4297 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4298 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4299 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4300 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4301 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4302 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4303 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4304 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4305 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4307 Version 1.20.0 (2017-08-31)
4308 ===========================
4312 - [Associated constants are now stabilised.][42809]
4313 - [A lot of macro bugs are now fixed.][42913]
4318 - [Struct fields are now properly coerced to the expected field type.][42807]
4319 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4320 `wasm32-experimental-emscripten` target.
4321 - [Changed some of the error messages to be more helpful.][42033]
4322 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4324 - [rustc now reports the total number of errors on compilation failure][43015]
4325 previously this was only the number of errors in the pass that failed.
4326 - [Expansion in rustc has been sped up 29x.][42533]
4327 - [added `msp430-none-elf` target.][43099]
4328 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4330 - [Fixes backtraces on Redox][43228]
4331 - [rustc now identifies different versions of same crate when absolute paths of
4332 different types match in an error message.][42826]
4338 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4339 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4341 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4342 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4343 - [Impl `Clone` for `DefaultHasher`.][42799]
4344 - [Impl `Sync` for `SyncSender`.][42397]
4345 - [Impl `FromStr` for `char`][42271]
4346 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4348 - [allow messages in the `unimplemented!()` macro.][42155]
4349 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4350 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4351 - [Upgrade to Unicode 10.0.0][42999]
4352 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4353 - [Skip the main thread's manual stack guard on Linux][43072]
4354 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4355 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4357 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4362 - [`CStr::into_c_string`]
4363 - [`CString::as_c_str`]
4364 - [`CString::into_boxed_c_str`]
4365 - [`Chain::get_mut`]
4366 - [`Chain::get_ref`]
4367 - [`Chain::into_inner`]
4368 - [`Option::get_or_insert_with`]
4369 - [`Option::get_or_insert`]
4370 - [`OsStr::into_os_string`]
4371 - [`OsString::into_boxed_os_str`]
4374 - [`Utf8Error::error_len`]
4375 - [`char::EscapeDebug`]
4376 - [`char::escape_debug`]
4377 - [`compile_error!`]
4378 - [`f32::from_bits`]
4380 - [`f64::from_bits`]
4382 - [`mem::ManuallyDrop`]
4383 - [`slice::sort_unstable_by_key`]
4384 - [`slice::sort_unstable_by`]
4385 - [`slice::sort_unstable`]
4386 - [`str::from_boxed_utf8_unchecked`]
4387 - [`str::as_bytes_mut`]
4388 - [`str::as_bytes_mut`]
4389 - [`str::from_utf8_mut`]
4390 - [`str::from_utf8_unchecked_mut`]
4392 - [`str::get_unchecked_mut`]
4393 - [`str::get_unchecked`]
4395 - [`str::into_boxed_bytes`]
4400 - [Cargo API token location moved from `~/.cargo/config` to
4401 `~/.cargo/credentials`.][cargo/3978]
4402 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4403 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4404 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4405 - [You can now specify version of a binary when installed through
4406 `cargo install` using `--vers`.][cargo/4229]
4407 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4408 failure.][cargo/4248]
4409 - [Changed the convention around which file is the crate root.][cargo/4259]
4410 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4411 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4416 - [Functions with `'static` in their return types will now not be as usable as
4417 if they were using lifetime parameters instead.][42417]
4418 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4419 takes the sign of NaN into account where previously didn't.][42430]
4421 [42033]: https://github.com/rust-lang/rust/pull/42033
4422 [42155]: https://github.com/rust-lang/rust/pull/42155
4423 [42271]: https://github.com/rust-lang/rust/pull/42271
4424 [42397]: https://github.com/rust-lang/rust/pull/42397
4425 [42417]: https://github.com/rust-lang/rust/pull/42417
4426 [42430]: https://github.com/rust-lang/rust/pull/42430
4427 [42431]: https://github.com/rust-lang/rust/pull/42431
4428 [42533]: https://github.com/rust-lang/rust/pull/42533
4429 [42571]: https://github.com/rust-lang/rust/pull/42571
4430 [42613]: https://github.com/rust-lang/rust/pull/42613
4431 [42799]: https://github.com/rust-lang/rust/pull/42799
4432 [42807]: https://github.com/rust-lang/rust/pull/42807
4433 [42809]: https://github.com/rust-lang/rust/pull/42809
4434 [42822]: https://github.com/rust-lang/rust/pull/42822
4435 [42826]: https://github.com/rust-lang/rust/pull/42826
4436 [42854]: https://github.com/rust-lang/rust/pull/42854
4437 [42913]: https://github.com/rust-lang/rust/pull/42913
4438 [42999]: https://github.com/rust-lang/rust/pull/42999
4439 [43011]: https://github.com/rust-lang/rust/pull/43011
4440 [43015]: https://github.com/rust-lang/rust/pull/43015
4441 [43072]: https://github.com/rust-lang/rust/pull/43072
4442 [43077]: https://github.com/rust-lang/rust/pull/43077
4443 [43097]: https://github.com/rust-lang/rust/pull/43097
4444 [43099]: https://github.com/rust-lang/rust/pull/43099
4445 [43170]: https://github.com/rust-lang/rust/pull/43170
4446 [43178]: https://github.com/rust-lang/rust/pull/43178
4447 [43185]: https://github.com/rust-lang/rust/pull/43185
4448 [43228]: https://github.com/rust-lang/rust/pull/43228
4449 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4450 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4451 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4452 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4453 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4454 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4455 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4456 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4457 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4458 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4459 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4460 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4461 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4462 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4463 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4464 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4465 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4466 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4467 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4468 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4469 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4470 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4471 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4472 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4473 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4474 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4475 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4476 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4477 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4478 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4479 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4480 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4481 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4482 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4483 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4484 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4485 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4486 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4487 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4490 Version 1.19.0 (2017-07-20)
4491 ===========================
4496 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4497 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4498 - [Macro recursion limit increased to 1024 from 64.][41676]
4499 - [Added lint for detecting unused macros.][41907]
4500 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4501 For example: `let x = loop { break 7; };`
4502 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4503 contain `Copy` types and cannot have a `Drop` implementation.
4504 Example: `union Foo { bar: u8, baz: usize }`
4505 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4506 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4511 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4512 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4513 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4514 you should use `--target armv7-linux-androideabi`.
4515 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4516 - [Minor optimisation of string operations.][42037]
4517 - [Compiler error message is now `aborting due to previous error(s)` instead of
4518 `aborting due to N previous errors`][42150] This was previously inaccurate and
4519 would only count certain kinds of errors.
4520 - [The compiler now supports Visual Studio 2017][42225]
4521 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4522 - [Added a lot][42264] of [new error codes][42302]
4523 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4524 libraries with C Run-time Libraries(CRT) to be statically linked.
4525 - [Fixed various ARM codegen bugs][42740]
4530 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4531 `Extend<Cow<'a, str>>`][41449]
4532 - [`Vec` now implements `From<&mut [T]>`][41530]
4533 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4534 - [`SplitWhitespace` now implements `Clone`][41659]
4535 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4537 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4538 macros, but for printing to stderr.
4543 - [`OsString::shrink_to_fit`]
4546 - [`thread::ThreadId`]
4551 - [Build scripts can now add environment variables to the environment
4552 the crate is being compiled in.
4553 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4554 - [Subcommands now replace the current process rather than spawning a new
4555 child process][cargo/3970]
4556 - [Workspace members can now accept glob file patterns][cargo/3979]
4557 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4558 the members in a given workspace.][cargo/3988]
4559 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4560 - [Target directory path is now in the cargo metadata][cargo/4022]
4561 - [Cargo no longer checks out a local working directory for the
4562 crates.io index][cargo/4026] This should provide smaller file size for the
4563 registry, and improve cloning times, especially on Windows machines.
4564 - [Added an `--exclude` option for excluding certain packages when using the
4565 `--all` option][cargo/4031]
4566 - [Cargo will now automatically retry when receiving a 5xx error
4567 from crates.io][cargo/4032]
4568 - [The `--features` option now accepts multiple comma or space
4569 delimited values.][cargo/4084]
4570 - [Added support for custom target specific runners][cargo/3954]
4575 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4577 - [Rust will now release XZ compressed packages][rust-installer/57]
4578 - [rustup will now prefer to download rust packages with
4579 XZ compression][rustup/1100] over GZip packages.
4580 - [Added the ability to escape `#` in rust documentation][41785] By adding
4581 additional `#`'s ie. `##` is now `#`
4586 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4587 - [`-Z` flags are now no longer allowed to be used on the stable
4588 compiler.][41751] This has been a warning for a year previous to this.
4589 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4590 longer works][42844]. Users should migrate to the built-in `check`
4591 command, which has been available since 1.16.
4592 - [Ending a float literal with `._` is now a hard error.
4593 Example: `42._` .][41946]
4594 - [Any use of a private `extern crate` outside of its module is now a
4595 hard error.][36886] This was previously a warning.
4596 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4597 relative while the `::` prefix makes a path absolute, but was ignored and the
4598 path was relative regardless.
4599 - [Floating point constants in match patterns is now a hard error][36890]
4600 This was previously a warning.
4601 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4602 match patterns is now a hard error][36891] This was previously a warning.
4603 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4605 - [From the pound escape, lines consisting of multiple `#`s are
4607 - [It is an error to re-export private enum variants][42460]. This is
4608 known to break a number of crates that depend on an older version of
4610 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4611 to use it to find the linker, and the build will fail where it did
4612 not previously][42607]
4614 [36886]: https://github.com/rust-lang/rust/issues/36886
4615 [36888]: https://github.com/rust-lang/rust/issues/36888
4616 [36890]: https://github.com/rust-lang/rust/issues/36890
4617 [36891]: https://github.com/rust-lang/rust/issues/36891
4618 [36892]: https://github.com/rust-lang/rust/issues/36892
4619 [37406]: https://github.com/rust-lang/rust/issues/37406
4620 [39983]: https://github.com/rust-lang/rust/pull/39983
4621 [41145]: https://github.com/rust-lang/rust/pull/41145
4622 [41192]: https://github.com/rust-lang/rust/pull/41192
4623 [41258]: https://github.com/rust-lang/rust/pull/41258
4624 [41370]: https://github.com/rust-lang/rust/pull/41370
4625 [41449]: https://github.com/rust-lang/rust/pull/41449
4626 [41530]: https://github.com/rust-lang/rust/pull/41530
4627 [41624]: https://github.com/rust-lang/rust/pull/41624
4628 [41656]: https://github.com/rust-lang/rust/pull/41656
4629 [41659]: https://github.com/rust-lang/rust/pull/41659
4630 [41676]: https://github.com/rust-lang/rust/pull/41676
4631 [41751]: https://github.com/rust-lang/rust/pull/41751
4632 [41764]: https://github.com/rust-lang/rust/pull/41764
4633 [41785]: https://github.com/rust-lang/rust/pull/41785
4634 [41873]: https://github.com/rust-lang/rust/pull/41873
4635 [41907]: https://github.com/rust-lang/rust/pull/41907
4636 [41946]: https://github.com/rust-lang/rust/pull/41946
4637 [42016]: https://github.com/rust-lang/rust/pull/42016
4638 [42037]: https://github.com/rust-lang/rust/pull/42037
4639 [42068]: https://github.com/rust-lang/rust/pull/42068
4640 [42150]: https://github.com/rust-lang/rust/pull/42150
4641 [42162]: https://github.com/rust-lang/rust/pull/42162
4642 [42225]: https://github.com/rust-lang/rust/pull/42225
4643 [42264]: https://github.com/rust-lang/rust/pull/42264
4644 [42302]: https://github.com/rust-lang/rust/pull/42302
4645 [42460]: https://github.com/rust-lang/rust/issues/42460
4646 [42607]: https://github.com/rust-lang/rust/issues/42607
4647 [42740]: https://github.com/rust-lang/rust/pull/42740
4648 [42844]: https://github.com/rust-lang/rust/issues/42844
4649 [42948]: https://github.com/rust-lang/rust/pull/42948
4650 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4651 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4652 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4653 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4654 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4655 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4656 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4657 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4658 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4659 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4660 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4661 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4662 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4663 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4664 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4665 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4666 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4667 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4668 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4669 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4670 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4671 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4674 Version 1.18.0 (2017-06-08)
4675 ===========================
4680 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4681 make the item visible to just that module tree. Also accepts the keyword
4682 `crate` to make something public to the whole crate but not users of the
4683 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4684 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4685 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4686 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4687 types like `Write + Send`, trailing `+` are now supported in trait objects,
4688 and better error reporting for trait objects starting with `?Sized`.
4689 - [0e+10 is now a valid floating point literal][40589]
4690 - [Now warns if you bind a lifetime parameter to 'static][40734]
4691 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4692 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4693 representation in some cases.][40377]
4698 - [rustc can now emit mir with `--emit mir`][39891]
4699 - [Improved LLVM IR for trivial functions][40367]
4700 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4701 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4702 opportunities found through profiling
4703 - [Improved backtrace formatting when panicking][38165]
4708 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4709 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4710 iteration or reallocation.
4711 - [Simplified HashMap Bucket interface][40561] provides performance
4712 improvements for iterating and cloning.
4713 - [Specialize Vec::from_elem to use calloc][40409]
4714 - [Fixed Race condition in fs::create_dir_all][39799]
4715 - [No longer caching stdio on Windows][40516]
4716 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4717 2.50%~ faster and in one case now 12.50% faster.
4718 - [Optimized `AtomicBool::fetch_nand`][41143]
4723 - [`Child::try_wait`]
4724 - [`HashMap::retain`]
4725 - [`HashSet::retain`]
4727 - [`TcpStream::peek`]
4728 - [`UdpSocket::peek`]
4729 - [`UdpSocket::peek_from`]
4734 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4735 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4736 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4737 - [Added Android build support][cargo/3885]
4738 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4739 of a certain type, for example `cargo build --bins` will build all
4741 - [Added support for haiku][cargo/3952]
4746 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4747 - [Added rust-windbg script for better debugging on Windows][39983]
4748 - [Rust now uses the official cross compiler for NetBSD][40612]
4749 - [rustdoc now accepts `#` at the start of files][40828]
4750 - [Fixed jemalloc support for musl][41168]
4755 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4756 always placed after the sign if it exists and before the digits. With the `#`
4757 flag the zeroes are placed after the prefix and before the digits.
4758 - [Due to the struct field optimisation][40377], using `transmute` on structs
4759 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4760 always been undefined behavior, but is now more likely to break in practice.
4761 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4762 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4763 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4764 - [Overlapping inherent `impl`s are now a hard error][40728]
4765 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4766 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4767 `out.asm` and `out.ll` instead of only one of the filetypes.
4768 - [ calling a function that returns `Self` will no longer work][41805] when
4769 the size of `Self` cannot be statically determined.
4770 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4771 this has caused a few regressions namely:
4773 - Changed the link order of local static/dynamic libraries (respecting the
4774 order on given rather than having the compiler reorder).
4775 - Changed how MinGW is linked, native code linked to dynamic libraries
4776 may require manually linking to the gcc support library (for the native
4779 [38165]: https://github.com/rust-lang/rust/pull/38165
4780 [39799]: https://github.com/rust-lang/rust/pull/39799
4781 [39891]: https://github.com/rust-lang/rust/pull/39891
4782 [39983]: https://github.com/rust-lang/rust/pull/39983
4783 [40043]: https://github.com/rust-lang/rust/pull/40043
4784 [40241]: https://github.com/rust-lang/rust/pull/40241
4785 [40338]: https://github.com/rust-lang/rust/pull/40338
4786 [40367]: https://github.com/rust-lang/rust/pull/40367
4787 [40377]: https://github.com/rust-lang/rust/pull/40377
4788 [40409]: https://github.com/rust-lang/rust/pull/40409
4789 [40516]: https://github.com/rust-lang/rust/pull/40516
4790 [40556]: https://github.com/rust-lang/rust/pull/40556
4791 [40561]: https://github.com/rust-lang/rust/pull/40561
4792 [40589]: https://github.com/rust-lang/rust/pull/40589
4793 [40612]: https://github.com/rust-lang/rust/pull/40612
4794 [40723]: https://github.com/rust-lang/rust/pull/40723
4795 [40728]: https://github.com/rust-lang/rust/pull/40728
4796 [40731]: https://github.com/rust-lang/rust/pull/40731
4797 [40734]: https://github.com/rust-lang/rust/pull/40734
4798 [40805]: https://github.com/rust-lang/rust/pull/40805
4799 [40807]: https://github.com/rust-lang/rust/pull/40807
4800 [40828]: https://github.com/rust-lang/rust/pull/40828
4801 [40870]: https://github.com/rust-lang/rust/pull/40870
4802 [41085]: https://github.com/rust-lang/rust/pull/41085
4803 [41143]: https://github.com/rust-lang/rust/pull/41143
4804 [41168]: https://github.com/rust-lang/rust/pull/41168
4805 [41270]: https://github.com/rust-lang/rust/issues/41270
4806 [41469]: https://github.com/rust-lang/rust/pull/41469
4807 [41805]: https://github.com/rust-lang/rust/issues/41805
4808 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4809 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4810 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4811 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4812 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4813 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4814 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4815 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4816 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4817 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4818 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4819 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4820 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4821 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4824 Version 1.17.0 (2017-04-27)
4825 ===========================
4830 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4831 * [Fields of structs may be initialized without duplicating the field/variable
4832 names][39761]. [RFC 1682]
4833 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4834 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4835 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4836 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4837 `'b`. Soundness fix.
4838 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4839 * [Static variables may contain references to other statics][40027]
4844 * [Exit quickly on only `--emit dep-info`][40336]
4845 * [Make `-C relocation-model` more correctly determine whether the linker
4846 creates a position-independent executable][40245]
4847 * [Add `-C overflow-checks` to directly control whether integer overflow
4849 * [The rustc type checker now checks items on demand instead of in a single
4850 in-order pass][40008]. This is mostly an internal refactoring in support of
4851 future work, including incremental type checking, but also resolves [RFC
4852 1647], allowing `Self` to appear in `impl` `where` clauses.
4853 * [Optimize vtable loads][39995]
4854 * [Turn off vectorization for Emscripten targets][39990]
4855 * [Provide suggestions for unknown macros imported with `use`][39953]
4856 * [Fix ICEs in path resolution][39939]
4857 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4858 * [Add clearer error message using `&str + &str`][39116]
4869 * [`Ordering::then`]
4870 * [`Ordering::then_with`]
4871 * [`BTreeMap::range`]
4872 * [`BTreeMap::range_mut`]
4873 * [`collections::Bound`]
4874 * [`process::abort`]
4875 * [`ptr::read_unaligned`]
4876 * [`ptr::write_unaligned`]
4877 * [`Result::expect_err`]
4880 * [`Cell::into_inner`]
4886 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4887 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4888 * [`String` implements `FromIterator<&char>`][40028]
4889 * `Box` [implements][40009] a number of new conversions:
4890 `From<Box<str>> for String`,
4891 `From<Box<[T]>> for Vec<T>`,
4892 `From<Box<CStr>> for CString`,
4893 `From<Box<OsStr>> for OsString`,
4894 `From<Box<Path>> for PathBuf`,
4895 `Into<Box<str>> for String`,
4896 `Into<Box<[T]>> for Vec<T>`,
4897 `Into<Box<CStr>> for CString`,
4898 `Into<Box<OsStr>> for OsString`,
4899 `Into<Box<Path>> for PathBuf`,
4900 `Default for Box<str>`,
4901 `Default for Box<CStr>`,
4902 `Default for Box<OsStr>`,
4903 `From<&CStr> for Box<CStr>`,
4904 `From<&OsStr> for Box<OsStr>`,
4905 `From<&Path> for Box<Path>`
4906 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4907 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4908 * [Slightly optimize `slice::sort`][39538]
4909 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4910 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4911 `Box<str>` implements `From<&str>`][39438]
4912 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4913 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4914 * [`format!` estimates the needed capacity before writing a string][39356]
4915 * [Support unprivileged symlink creation in Windows][38921]
4916 * [`PathBuf` implements `Default`][38764]
4917 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4918 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4919 and poor hash functions.
4924 * [Add `cargo check --all`][cargo/3731]
4925 * [Add an option to ignore SSL revocation checking][cargo/3699]
4926 * [Add `cargo run --package`][cargo/3691]
4927 * [Add `required_features`][cargo/3667]
4928 * [Assume `build.rs` is a build script][cargo/3664]
4929 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4934 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4936 * [The "Unstable Book" documents nightly-only features][ubook]
4937 * [Improve the style of the sidebar in rustdoc output][40265]
4938 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4939 * [Fix MSP430 breakage due to `i128`][40257]
4940 * [Preliminary Solaris/SPARCv9 support][39903]
4941 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4942 run without installing the MSVC runtime.
4943 * [`rustdoc --test` includes file names in test names][39788]
4944 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4945 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4946 * [Initial support for `aarch64-unknown-freebsd`][39491]
4947 * [Initial support for `i686-unknown-netbsd`][39426]
4948 * [This release no longer includes the old makefile build system][39431]. Rust
4949 is built with a custom build system, written in Rust, and with Cargo.
4950 * [Add Debug implementations for libcollection structs][39002]
4951 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4952 * [`--test-threads=0` produces an error][38945]
4953 * [`rustup` installs documentation by default][40526]
4954 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4955 WinDbg and Visual Studio to improve the debugging experience.
4960 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4961 workaround, either use MSVC 2015 or run vcvars.bat.
4962 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4963 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4964 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4966 * [`format!` and `Display::to_string` panic if an underlying formatting
4967 implementation returns an error][40117]. Previously the error was silently
4968 ignored. It is incorrect for `write_fmt` to return an error when writing
4970 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4971 crates were marked stable and could be accessed from the stable toolchain.
4972 * [Rust git source no longer includes vendored crates][39728]. Those that need
4973 to build with vendored crates should build from release tarballs.
4974 * [Fix inert attributes from `proc_macro_derives`][39572]
4975 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4976 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4978 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4979 existing code generally ignores the type of dead-code unless a type-hint is
4980 provided; this can cause surprising inference interactions particularly around
4981 defaulting. The new code uniformly ignores the result type of dead-code.
4982 * [Tuple-struct constructors with private fields are no longer visible][38932]
4983 * [Lifetime parameters that do not appear in the arguments are now considered
4984 early-bound][38897], resolving a soundness bug (#[32330]). The
4985 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4987 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4988 * [Make transmuting from fn item types to pointer-sized types a hard
4991 [27787]: https://github.com/rust-lang/rust/issues/27787
4992 [32330]: https://github.com/rust-lang/rust/issues/32330
4993 [34198]: https://github.com/rust-lang/rust/pull/34198
4994 [38161]: https://github.com/rust-lang/rust/pull/38161
4995 [38368]: https://github.com/rust-lang/rust/pull/38368
4996 [38584]: https://github.com/rust-lang/rust/issues/38584
4997 [38661]: https://github.com/rust-lang/rust/pull/38661
4998 [38764]: https://github.com/rust-lang/rust/pull/38764
4999 [38864]: https://github.com/rust-lang/rust/issues/38864
5000 [38897]: https://github.com/rust-lang/rust/pull/38897
5001 [38921]: https://github.com/rust-lang/rust/pull/38921
5002 [38932]: https://github.com/rust-lang/rust/pull/38932
5003 [38945]: https://github.com/rust-lang/rust/pull/38945
5004 [38981]: https://github.com/rust-lang/rust/pull/38981
5005 [39002]: https://github.com/rust-lang/rust/pull/39002
5006 [39116]: https://github.com/rust-lang/rust/pull/39116
5007 [39193]: https://github.com/rust-lang/rust/pull/39193
5008 [39265]: https://github.com/rust-lang/rust/pull/39265
5009 [39356]: https://github.com/rust-lang/rust/pull/39356
5010 [39372]: https://github.com/rust-lang/rust/pull/39372
5011 [39426]: https://github.com/rust-lang/rust/pull/39426
5012 [39431]: https://github.com/rust-lang/rust/pull/39431
5013 [39438]: https://github.com/rust-lang/rust/pull/39438
5014 [39440]: https://github.com/rust-lang/rust/pull/39440
5015 [39485]: https://github.com/rust-lang/rust/pull/39485
5016 [39491]: https://github.com/rust-lang/rust/pull/39491
5017 [39518]: https://github.com/rust-lang/rust/pull/39518
5018 [39538]: https://github.com/rust-lang/rust/pull/39538
5019 [39572]: https://github.com/rust-lang/rust/pull/39572
5020 [39633]: https://github.com/rust-lang/rust/pull/39633
5021 [39642]: https://github.com/rust-lang/rust/pull/39642
5022 [39728]: https://github.com/rust-lang/rust/pull/39728
5023 [39761]: https://github.com/rust-lang/rust/pull/39761
5024 [39788]: https://github.com/rust-lang/rust/pull/39788
5025 [39793]: https://github.com/rust-lang/rust/pull/39793
5026 [39837]: https://github.com/rust-lang/rust/pull/39837
5027 [39843]: https://github.com/rust-lang/rust/pull/39843
5028 [39851]: https://github.com/rust-lang/rust/pull/39851
5029 [39903]: https://github.com/rust-lang/rust/pull/39903
5030 [39939]: https://github.com/rust-lang/rust/pull/39939
5031 [39953]: https://github.com/rust-lang/rust/pull/39953
5032 [39960]: https://github.com/rust-lang/rust/pull/39960
5033 [39990]: https://github.com/rust-lang/rust/pull/39990
5034 [39995]: https://github.com/rust-lang/rust/pull/39995
5035 [40008]: https://github.com/rust-lang/rust/pull/40008
5036 [40009]: https://github.com/rust-lang/rust/pull/40009
5037 [40027]: https://github.com/rust-lang/rust/pull/40027
5038 [40028]: https://github.com/rust-lang/rust/pull/40028
5039 [40037]: https://github.com/rust-lang/rust/pull/40037
5040 [40117]: https://github.com/rust-lang/rust/pull/40117
5041 [40166]: https://github.com/rust-lang/rust/pull/40166
5042 [40245]: https://github.com/rust-lang/rust/pull/40245
5043 [40257]: https://github.com/rust-lang/rust/pull/40257
5044 [40261]: https://github.com/rust-lang/rust/pull/40261
5045 [40265]: https://github.com/rust-lang/rust/pull/40265
5046 [40319]: https://github.com/rust-lang/rust/pull/40319
5047 [40336]: https://github.com/rust-lang/rust/pull/40336
5048 [40526]: https://github.com/rust-lang/rust/pull/40526
5049 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5050 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5051 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5052 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5053 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5054 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5055 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5056 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5057 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5058 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5059 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5060 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5061 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5062 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5063 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5064 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5065 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5066 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5067 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5068 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5069 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5070 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5071 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5072 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5073 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5074 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5075 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5076 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5077 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5078 [mdbook]: https://crates.io/crates/mdbook
5079 [ubook]: https://doc.rust-lang.org/unstable-book/
5082 Version 1.16.0 (2017-03-16)
5083 ===========================
5088 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5089 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5090 match patterns][38069]
5091 * [Clean up semantics of `self` in an import list][38313]
5092 * [`Self` may appear in `impl` headers][38920]
5093 * [`Self` may appear in struct expressions][39282]
5098 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5099 a `.rmeta` file containing only crate metadata][38571]. This can be
5100 used by tools like the Rust Language Service to perform
5101 metadata-only builds.
5102 * [Levenshtein based typo suggestions now work in most places, while
5103 previously they worked only for fields and sometimes for local
5104 variables][38927]. Together with the overhaul of "no
5105 resolution"/"unexpected resolution" errors (#[38154]) they result in
5106 large and systematic improvement in resolution diagnostics.
5107 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5109 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5110 * [`rustc` no longer attempts to provide "consider using an explicit
5111 lifetime" suggestions][37057]. They were inaccurate.
5116 * [`VecDeque::truncate`]
5117 * [`VecDeque::resize`]
5118 * [`String::insert_str`]
5119 * [`Duration::checked_add`]
5120 * [`Duration::checked_sub`]
5121 * [`Duration::checked_div`]
5122 * [`Duration::checked_mul`]
5125 * [`SocketAddr::is_ipv4`]
5126 * [`SocketAddr::is_ipv6`]
5127 * [`IpAddr::is_ipv4`]
5128 * [`IpAddr::is_ipv6`]
5130 * [`Vec::dedup_by_key`]
5131 * [`Result::unwrap_or_default`]
5132 * [`<*const T>::wrapping_offset`]
5133 * [`<*mut T>::wrapping_offset`]
5134 * `CommandExt::creation_flags`
5135 * [`File::set_permissions`]
5136 * [`String::split_off`]
5141 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5142 their argument by `Borrow` parameter][37761]
5143 * [All public types in std implement `Debug`][38006]
5144 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5145 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5146 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5148 * [std: Fix partial writes in `LineWriter`][38062]
5149 * [std: Clamp max read/write sizes on Unix][38062]
5150 * [Use more specific panic message for `&str` slicing errors][38066]
5151 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5152 functionality cannot be achieved in std currently.
5153 * [`writeln!`, like `println!`, now accepts a form with no string
5154 or formatting arguments, to just print a newline][38469]
5155 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5156 * [Reduce the size of static data in `std_unicode::tables`][38781]
5157 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5158 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5160 * [`Duration` implements `Sum`][38712]
5161 * [`String` implements `ToSocketAddrs`][39048]
5166 * [The `cargo check` command does a type check of a project without
5167 building it][cargo/3296]
5168 * [crates.io will display CI badges from Travis and AppVeyor, if
5169 specified in Cargo.toml][cargo/3546]
5170 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5171 * [Compilation profiles accept integer values for `debug`, in addition
5172 to `true` and `false`. These are passed to `rustc` as the value to
5173 `-C debuginfo`][cargo/3534]
5174 * [Implement `cargo --version --verbose`][cargo/3604]
5175 * [All builds now output 'dep-info' build dependencies compatible with
5176 make and ninja][cargo/3557]
5177 * [Build all workspace members with `build --all`][cargo/3511]
5178 * [Document all workspace members with `doc --all`][cargo/3515]
5179 * [Path deps outside workspace are not members][cargo/3443]
5184 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5185 the path to the Rust implementation][38589]
5186 * [The `armv7-linux-androideabi` target no longer enables NEON
5187 extensions, per Google's ABI guide][38413]
5188 * [The stock standard library can be compiled for Redox OS][38401]
5189 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5191 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5193 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5198 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5199 match patterns][38069]
5200 * In this release, references to uninhabited types can not be
5201 pattern-matched. This was accidentally allowed in 1.15.
5202 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5203 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5205 * [Clean up semantics of `self` in an import list][38313]
5206 * Reimplemented lifetime elision. This change was almost entirely compatible
5207 with existing code, but it did close a number of small bugs and loopholes,
5208 as well as being more accepting in some other [cases][41105].
5210 [37057]: https://github.com/rust-lang/rust/pull/37057
5211 [37761]: https://github.com/rust-lang/rust/pull/37761
5212 [38006]: https://github.com/rust-lang/rust/pull/38006
5213 [38051]: https://github.com/rust-lang/rust/pull/38051
5214 [38062]: https://github.com/rust-lang/rust/pull/38062
5215 [38062]: https://github.com/rust-lang/rust/pull/38622
5216 [38066]: https://github.com/rust-lang/rust/pull/38066
5217 [38069]: https://github.com/rust-lang/rust/pull/38069
5218 [38131]: https://github.com/rust-lang/rust/pull/38131
5219 [38154]: https://github.com/rust-lang/rust/pull/38154
5220 [38274]: https://github.com/rust-lang/rust/pull/38274
5221 [38304]: https://github.com/rust-lang/rust/pull/38304
5222 [38313]: https://github.com/rust-lang/rust/pull/38313
5223 [38314]: https://github.com/rust-lang/rust/pull/38314
5224 [38327]: https://github.com/rust-lang/rust/pull/38327
5225 [38401]: https://github.com/rust-lang/rust/pull/38401
5226 [38413]: https://github.com/rust-lang/rust/pull/38413
5227 [38469]: https://github.com/rust-lang/rust/pull/38469
5228 [38559]: https://github.com/rust-lang/rust/pull/38559
5229 [38571]: https://github.com/rust-lang/rust/pull/38571
5230 [38580]: https://github.com/rust-lang/rust/pull/38580
5231 [38589]: https://github.com/rust-lang/rust/pull/38589
5232 [38670]: https://github.com/rust-lang/rust/pull/38670
5233 [38712]: https://github.com/rust-lang/rust/pull/38712
5234 [38726]: https://github.com/rust-lang/rust/pull/38726
5235 [38781]: https://github.com/rust-lang/rust/pull/38781
5236 [38798]: https://github.com/rust-lang/rust/pull/38798
5237 [38909]: https://github.com/rust-lang/rust/pull/38909
5238 [38920]: https://github.com/rust-lang/rust/pull/38920
5239 [38927]: https://github.com/rust-lang/rust/pull/38927
5240 [39048]: https://github.com/rust-lang/rust/pull/39048
5241 [39282]: https://github.com/rust-lang/rust/pull/39282
5242 [39379]: https://github.com/rust-lang/rust/pull/39379
5243 [41105]: https://github.com/rust-lang/rust/issues/41105
5244 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5245 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5246 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5247 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5248 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5249 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5250 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5251 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5252 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5253 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5254 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5255 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5256 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5257 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5258 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5259 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5260 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5261 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5262 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5263 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5264 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5265 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5266 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5267 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5268 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5269 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5270 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5271 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5272 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5273 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5276 Version 1.15.1 (2017-02-09)
5277 ===========================
5279 * [Fix IntoIter::as_mut_slice's signature][39466]
5280 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5282 [39466]: https://github.com/rust-lang/rust/pull/39466
5283 [39523]: https://github.com/rust-lang/rust/pull/39523
5286 Version 1.15.0 (2017-02-02)
5287 ===========================
5292 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5293 stable. This allows popular code-generating crates like Serde and Diesel to
5294 work ergonomically. [RFC 1681].
5295 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5296 with curly braces][36868]. Part of [RFC 1506].
5297 * [A number of minor changes to name resolution have been activated][37127].
5298 They add up to more consistent semantics, allowing for future evolution of
5299 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5300 details of what is different. The breaking changes here have been transitioned
5301 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5302 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5304 * [`?Sized` can be used in `where` clauses][37791]
5305 * [There is now a limit on the size of monomorphized types and it can be
5306 modified with the `#![type_size_limit]` crate attribute, similarly to
5307 the `#![recursion_limit]` attribute][37789]
5312 * [On Windows, the compiler will apply dllimport attributes when linking to
5313 extern functions][37973]. Additional attributes and flags can control which
5314 library kind is linked and its name. [RFC 1717].
5315 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5316 * [The `--test` flag works with procedural macro crates][38107]
5317 * [Fix `extern "aapcs" fn` ABI][37814]
5318 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5319 * [The `format!` expander recognizes incorrect `printf` and shell-style
5320 formatting directives and suggests the correct format][37613].
5321 * [Only report one error for all unused imports in an import list][37456]
5323 Compiler Performance
5324 --------------------
5326 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5327 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5328 * [Don't clone in `UnificationTable::probe`][37848]
5329 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5330 * [Use small vectors in type walker][37760]
5331 * [Macro expansion performance was improved][37701]
5332 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5333 * [Replace FNV with a faster hash function][37229]
5338 * [`std::iter::Iterator::min_by`]
5339 * [`std::iter::Iterator::max_by`]
5340 * [`std::os::*::fs::FileExt`]
5341 * [`std::sync::atomic::Atomic*::get_mut`]
5342 * [`std::sync::atomic::Atomic*::into_inner`]
5343 * [`std::vec::IntoIter::as_slice`]
5344 * [`std::vec::IntoIter::as_mut_slice`]
5345 * [`std::sync::mpsc::Receiver::try_iter`]
5346 * [`std::os::unix::process::CommandExt::before_exec`]
5347 * [`std::rc::Rc::strong_count`]
5348 * [`std::rc::Rc::weak_count`]
5349 * [`std::sync::Arc::strong_count`]
5350 * [`std::sync::Arc::weak_count`]
5351 * [`std::char::encode_utf8`]
5352 * [`std::char::encode_utf16`]
5353 * [`std::cell::Ref::clone`]
5354 * [`std::io::Take::into_inner`]
5359 * [The standard sorting algorithm has been rewritten for dramatic performance
5360 improvements][38192]. It is a hybrid merge sort, drawing influences from
5361 Timsort. Previously it was a naive merge sort.
5362 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5363 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5365 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5366 and `char_indices().last()`][37882]
5367 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5368 * [Chinese characters display correctly in `fmt::Debug`][37855]
5369 * [Derive `Default` for `Duration`][37699]
5370 * [Support creation of anonymous pipes on WinXP/2k][37677]
5371 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5372 * [Don't pass overlapped handles to processes][38835]
5377 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5378 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5379 should instead check the variable at runtime with `std::env`. That the value
5380 was set at build time was a bug, and incorrect when cross-compiling. This
5381 change is known to cause breakage.
5382 * [Add `--all` flag to `cargo test`][cargo/3221]
5383 * [Compile statically against the MSVC CRT][cargo/3363]
5384 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5385 * [Link OpenSSL statically on OSX][cargo/3311]
5386 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5387 * [Test for bad path overrides with summaries][cargo/3336]
5388 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5389 * [Fix retrying crate downloads for network errors][cargo/3348]
5390 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5391 * [Emit more info on --message-format=json][cargo/3319]
5392 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5393 * [Don't ignore errors in workspace manifest][cargo/3409]
5394 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5399 * [Test runners (binaries built with `--test`) now support a `--list` argument
5400 that lists the tests it contains][38185]
5401 * [Test runners now support a `--exact` argument that makes the test filter
5402 match exactly, instead of matching only a substring of the test name][38181]
5403 * [rustdoc supports a `--playground-url` flag][37763]
5404 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5409 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5410 continue to be used in this release by passing `--disable-rustbuild` to the
5411 configure script, but they will be deleted soon. Note that the new build
5412 system uses a different on-disk layout that will likely affect any scripts
5414 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5416 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5417 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5423 * [A number of minor changes to name resolution have been activated][37127].
5424 They add up to more consistent semantics, allowing for future evolution of
5425 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5426 details of what is different. The breaking changes here have been transitioned
5427 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5428 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5429 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5430 should instead check the variable at runtime with `std::env`. That the value
5431 was set at build time was a bug, and incorrect when cross-compiling. This
5432 change is known to cause breakage.
5433 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5434 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5435 1.10 and is now an error by default. It will become a hard error in the near
5437 * [The semantics relating modules to file system directories are changing in
5438 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5439 lint, which is a warning in this release, and will become a hard error in the
5441 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5442 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5443 the underlying iterator][37834]
5445 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5446 [33685]: https://github.com/rust-lang/rust/issues/33685
5447 [36868]: https://github.com/rust-lang/rust/pull/36868
5448 [37127]: https://github.com/rust-lang/rust/pull/37127
5449 [37229]: https://github.com/rust-lang/rust/pull/37229
5450 [37456]: https://github.com/rust-lang/rust/pull/37456
5451 [37527]: https://github.com/rust-lang/rust/pull/37527
5452 [37602]: https://github.com/rust-lang/rust/pull/37602
5453 [37613]: https://github.com/rust-lang/rust/pull/37613
5454 [37615]: https://github.com/rust-lang/rust/pull/37615
5455 [37636]: https://github.com/rust-lang/rust/pull/37636
5456 [37627]: https://github.com/rust-lang/rust/pull/37627
5457 [37642]: https://github.com/rust-lang/rust/pull/37642
5458 [37677]: https://github.com/rust-lang/rust/pull/37677
5459 [37699]: https://github.com/rust-lang/rust/pull/37699
5460 [37701]: https://github.com/rust-lang/rust/pull/37701
5461 [37705]: https://github.com/rust-lang/rust/pull/37705
5462 [37749]: https://github.com/rust-lang/rust/pull/37749
5463 [37760]: https://github.com/rust-lang/rust/pull/37760
5464 [37763]: https://github.com/rust-lang/rust/pull/37763
5465 [37764]: https://github.com/rust-lang/rust/pull/37764
5466 [37789]: https://github.com/rust-lang/rust/pull/37789
5467 [37791]: https://github.com/rust-lang/rust/pull/37791
5468 [37814]: https://github.com/rust-lang/rust/pull/37814
5469 [37817]: https://github.com/rust-lang/rust/pull/37817
5470 [37834]: https://github.com/rust-lang/rust/pull/37834
5471 [37848]: https://github.com/rust-lang/rust/pull/37848
5472 [37855]: https://github.com/rust-lang/rust/pull/37855
5473 [37882]: https://github.com/rust-lang/rust/pull/37882
5474 [37888]: https://github.com/rust-lang/rust/pull/37888
5475 [37973]: https://github.com/rust-lang/rust/pull/37973
5476 [37979]: https://github.com/rust-lang/rust/pull/37979
5477 [38086]: https://github.com/rust-lang/rust/pull/38086
5478 [38107]: https://github.com/rust-lang/rust/pull/38107
5479 [38117]: https://github.com/rust-lang/rust/pull/38117
5480 [38134]: https://github.com/rust-lang/rust/pull/38134
5481 [38146]: https://github.com/rust-lang/rust/pull/38146
5482 [38181]: https://github.com/rust-lang/rust/pull/38181
5483 [38182]: https://github.com/rust-lang/rust/pull/38182
5484 [38185]: https://github.com/rust-lang/rust/pull/38185
5485 [38192]: https://github.com/rust-lang/rust/pull/38192
5486 [38279]: https://github.com/rust-lang/rust/pull/38279
5487 [38835]: https://github.com/rust-lang/rust/pull/38835
5488 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5489 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5490 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5491 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5492 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5493 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5494 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5495 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5496 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5497 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5498 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5499 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5500 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5501 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5502 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5503 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5504 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5505 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5506 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5507 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5508 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5509 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5510 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5511 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5512 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5513 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5514 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5515 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5516 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5517 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5518 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5519 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5520 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5521 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5522 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5523 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5524 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5525 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5528 Version 1.14.0 (2016-12-22)
5529 ===========================
5534 * [`..` matches multiple tuple fields in enum variants, structs
5535 and tuples][36843]. [RFC 1492].
5536 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5537 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5538 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5539 dereferencing][36822]
5544 * [Mark enums with non-zero discriminant as non-zero][37224]
5545 * [Lower-case `static mut` names are linted like other
5546 statics and consts][37162]
5547 * [Fix ICE on some macros in const integer positions
5548 (e.g. `[u8; m!()]`)][36819]
5549 * [Improve error message and snippet for "did you mean `x`"][36798]
5550 * [Add a panic-strategy field to the target specification][36794]
5551 * [Include LLVM version in `--version --verbose`][37200]
5553 Compile-time Optimizations
5554 --------------------------
5556 * [Improve macro expansion performance][37569]
5557 * [Shrink `Expr_::ExprInlineAsm`][37445]
5558 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5559 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5560 * [Avoid more allocations when compiling html5ever][37373]
5561 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5562 * [Avoid some allocations in the macro parser][37318]
5563 * [Use a faster deflate setting][37298]
5564 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5565 during interning of slices][37270]
5566 * [Optimize `write_metadata`][37267]
5567 * [Don't process obligation forest cycles when stalled][37231]
5568 * [Avoid many `CrateConfig` clones][37161]
5569 * [Optimize `Substs::super_fold_with`][37108]
5570 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5571 * [Speed up `plug_leaks`][36917]
5576 * [`println!()`, with no arguments, prints newline][36825].
5577 Previously, an empty string was required to achieve the same.
5578 * [`Wrapping` impls standard binary and unary operators, as well as
5579 the `Sum` and `Product` iterators][37356]
5580 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5582 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5583 `VecDeque` iterators][37315]
5584 * [Improve `SipHasher` performance on small values][37312]
5585 * [Add Iterator trait TrustedLen to enable better FromIterator /
5587 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5588 * [`ReadDir` implements `Debug`][37221]
5589 * [Implement `RefUnwindSafe` for atomic types][37178]
5590 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5591 * [Avoid allocations in `Decoder::read_str`][37064]
5592 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5593 * [Impl `Debug` for raw pointers to unsized data][36880]
5594 * [Don't reuse `HashMap` random seeds][37470]
5595 * [The internal memory layout of `HashMap` is more cache-friendly, for
5596 significant improvements in some operations][36692]
5597 * [`HashMap` uses less memory on 32-bit architectures][36595]
5598 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5603 * [Expose rustc cfg values to build scripts][cargo/3243]
5604 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5605 * [Fix passing --features when testing multiple packages][cargo/3280]
5606 * [Use a single profile set per workspace][cargo/3249]
5607 * [Load `replace` sections from lock files][cargo/3220]
5608 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5613 * [rustup is the recommended Rust installation method][1.14rustup]
5614 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5615 S390x. These are [tier 2] platforms and may have major defects. Follow the
5616 instructions on the website to install, or add the targets to an existing
5617 installation with `rustup target add`. The new target triples are:
5618 - `mips-unknown-linux-gnu`
5619 - `mipsel-unknown-linux-gnu`
5620 - `mips64-unknown-linux-gnuabi64`
5621 - `mips64el-unknown-linux-gnuabi64 `
5622 - `powerpc-unknown-linux-gnu`
5623 - `powerpc64-unknown-linux-gnu`
5624 - `powerpc64le-unknown-linux-gnu`
5625 - `s390x-unknown-linux-gnu `
5626 * This release includes target (std) builds for ARM Linux running MUSL
5627 libc. These are [tier 2] platforms and may have major defects. Add the
5628 following triples to an existing rustup installation with `rustup target add`:
5629 - `arm-unknown-linux-musleabi`
5630 - `arm-unknown-linux-musleabihf`
5631 - `armv7-unknown-linux-musleabihf`
5632 * This release includes [experimental support for WebAssembly][1.14wasm], via
5633 the `wasm32-unknown-emscripten` target. This target is known to have major
5634 defects. Please test, report, and fix.
5635 * rustup no longer installs documentation by default. Run `rustup
5636 component add rust-docs` to install.
5637 * [Fix line stepping in debugger][37310]
5638 * [Enable line number debuginfo in releases][37280]
5643 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5644 * [Add support for Fuchsia OS][37313]
5645 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5650 * [A number of forward-compatibility lints used by the compiler
5651 to gradually introduce language changes have been converted
5652 to deny by default][36894]:
5653 - ["use of inaccessible extern crate erroneously allowed"][36886]
5654 - ["type parameter default erroneously allowed in invalid location"][36887]
5655 - ["detects super or self keywords at the beginning of global path"][36888]
5656 - ["two overlapping inherent impls define an item with the same name
5657 were erroneously allowed"][36889]
5658 - ["floating-point constants cannot be used in patterns"][36890]
5659 - ["constants of struct or enum type can only be used in a pattern if
5660 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5661 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5662 * [Prohibit patterns in trait methods without bodies][37378]
5663 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5664 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5665 * [The `$crate` macro variable is accepted in fewer locations][37213]
5666 * [Impls specifying extra region requirements beyond the trait
5667 they implement are rejected][37167]
5668 * [Enums may not be unsized][37111]. Unsized enums are intended to
5669 work but never have. For now they are forbidden.
5670 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5672 [tier 2]: https://forge.rust-lang.org/platform-support.html
5673 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5674 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5675 [36430]: https://github.com/rust-lang/rust/pull/36430
5676 [36595]: https://github.com/rust-lang/rust/pull/36595
5677 [36595]: https://github.com/rust-lang/rust/pull/36595
5678 [36692]: https://github.com/rust-lang/rust/pull/36692
5679 [36767]: https://github.com/rust-lang/rust/pull/36767
5680 [36794]: https://github.com/rust-lang/rust/pull/36794
5681 [36798]: https://github.com/rust-lang/rust/pull/36798
5682 [36819]: https://github.com/rust-lang/rust/pull/36819
5683 [36822]: https://github.com/rust-lang/rust/pull/36822
5684 [36825]: https://github.com/rust-lang/rust/pull/36825
5685 [36843]: https://github.com/rust-lang/rust/pull/36843
5686 [36880]: https://github.com/rust-lang/rust/pull/36880
5687 [36886]: https://github.com/rust-lang/rust/issues/36886
5688 [36887]: https://github.com/rust-lang/rust/issues/36887
5689 [36888]: https://github.com/rust-lang/rust/issues/36888
5690 [36889]: https://github.com/rust-lang/rust/issues/36889
5691 [36890]: https://github.com/rust-lang/rust/issues/36890
5692 [36891]: https://github.com/rust-lang/rust/issues/36891
5693 [36892]: https://github.com/rust-lang/rust/issues/36892
5694 [36894]: https://github.com/rust-lang/rust/pull/36894
5695 [36917]: https://github.com/rust-lang/rust/pull/36917
5696 [36993]: https://github.com/rust-lang/rust/pull/36993
5697 [37037]: https://github.com/rust-lang/rust/pull/37037
5698 [37064]: https://github.com/rust-lang/rust/pull/37064
5699 [37094]: https://github.com/rust-lang/rust/pull/37094
5700 [37108]: https://github.com/rust-lang/rust/pull/37108
5701 [37111]: https://github.com/rust-lang/rust/pull/37111
5702 [37161]: https://github.com/rust-lang/rust/pull/37161
5703 [37162]: https://github.com/rust-lang/rust/pull/37162
5704 [37167]: https://github.com/rust-lang/rust/pull/37167
5705 [37178]: https://github.com/rust-lang/rust/pull/37178
5706 [37200]: https://github.com/rust-lang/rust/pull/37200
5707 [37213]: https://github.com/rust-lang/rust/pull/37213
5708 [37221]: https://github.com/rust-lang/rust/pull/37221
5709 [37224]: https://github.com/rust-lang/rust/pull/37224
5710 [37230]: https://github.com/rust-lang/rust/pull/37230
5711 [37231]: https://github.com/rust-lang/rust/pull/37231
5712 [37247]: https://github.com/rust-lang/rust/pull/37247
5713 [37267]: https://github.com/rust-lang/rust/pull/37267
5714 [37270]: https://github.com/rust-lang/rust/pull/37270
5715 [37273]: https://github.com/rust-lang/rust/pull/37273
5716 [37280]: https://github.com/rust-lang/rust/pull/37280
5717 [37298]: https://github.com/rust-lang/rust/pull/37298
5718 [37306]: https://github.com/rust-lang/rust/pull/37306
5719 [37310]: https://github.com/rust-lang/rust/pull/37310
5720 [37312]: https://github.com/rust-lang/rust/pull/37312
5721 [37313]: https://github.com/rust-lang/rust/pull/37313
5722 [37315]: https://github.com/rust-lang/rust/pull/37315
5723 [37318]: https://github.com/rust-lang/rust/pull/37318
5724 [37322]: https://github.com/rust-lang/rust/pull/37322
5725 [37326]: https://github.com/rust-lang/rust/pull/37326
5726 [37351]: https://github.com/rust-lang/rust/pull/37351
5727 [37356]: https://github.com/rust-lang/rust/pull/37356
5728 [37367]: https://github.com/rust-lang/rust/pull/37367
5729 [37373]: https://github.com/rust-lang/rust/pull/37373
5730 [37378]: https://github.com/rust-lang/rust/pull/37378
5731 [37389]: https://github.com/rust-lang/rust/pull/37389
5732 [37392]: https://github.com/rust-lang/rust/pull/37392
5733 [37427]: https://github.com/rust-lang/rust/pull/37427
5734 [37439]: https://github.com/rust-lang/rust/pull/37439
5735 [37445]: https://github.com/rust-lang/rust/pull/37445
5736 [37470]: https://github.com/rust-lang/rust/pull/37470
5737 [37569]: https://github.com/rust-lang/rust/pull/37569
5738 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5739 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5740 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5741 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5742 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5743 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5744 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5747 Version 1.13.0 (2016-11-10)
5748 ===========================
5753 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5754 errors, like the `try!` macro, described in [RFC 0243].
5755 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5756 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5757 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5758 * [Fix lifetime rules for 'if' conditions][36029]
5759 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5764 * [Add the `-C link-arg` argument][36574]
5765 * [Remove the old AST-based backend from rustc_trans][35764]
5766 * [Don't enable NEON by default on armv7 Linux][35814]
5767 * [Fix debug line number info for macro expansions][35238]
5768 * [Do not emit "class method" debuginfo for types that are not
5769 DICompositeType][36008]
5770 * [Warn about multiple conflicting #[repr] hints][34623]
5771 * [When sizing DST, don't double-count nested struct prefixes][36351]
5772 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5773 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5774 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5775 * [Expand macros without recursing to avoid stack overflows][36214]
5780 * [Replace macro backtraces with labeled local uses][35702]
5781 * [Improve error message for misplaced doc comments][33922]
5782 * [Buffer unix and lock windows to prevent message interleaving][35975]
5783 * [Update lifetime errors to specifically note temporaries][36171]
5784 * [Special case a few colors for Windows][36178]
5785 * [Suggest `use self` when such an import resolves][36289]
5786 * [Be more specific when type parameter shadows primitive type][36338]
5787 * Many minor improvements
5789 Compile-time Optimizations
5790 --------------------------
5792 * [Compute and cache HIR hashes at beginning][35854]
5793 * [Don't hash types in loan paths][36004]
5794 * [Cache projections in trans][35761]
5795 * [Optimize the parser's last token handling][36527]
5796 * [Only instantiate #[inline] functions in codegen units referencing
5797 them][36524]. This leads to big improvements in cases where crates export
5798 define many inline functions without using them directly.
5799 * [Lazily allocate TypedArena's first chunk][36592]
5800 * [Don't allocate during default HashSet creation][36734]
5807 * [`overflowing_abs`]
5808 * [`RefCell::try_borrow`]
5809 * [`RefCell::try_borrow_mut`]
5814 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5815 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5817 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5818 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5819 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5820 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5821 * [Use arc4rand on FreeBSD][35884]
5822 * [memrchr: Correct aligned offset computation][35969]
5823 * [Improve Demangling of Rust Symbols][36059]
5824 * [Use monotonic time in condition variables][35048]
5825 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5826 * [Implement conversion traits for `char`][35755]
5827 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5828 * [Zero first byte of CString on drop][36264]
5829 * [Inherit overflow checks for sum and product][36372]
5830 * [Add missing Eq implementations][36423]
5831 * [Implement `Debug` for `DirEntry`][36631]
5832 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5834 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5835 * [Implement more traits for `std::io::ErrorKind`][35911]
5836 * [Optimize BinaryHeap bounds checking][36072]
5837 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5838 `extend_with_element`][36355]
5839 * [Fix overflow checking in unsigned pow()][34942]
5844 * This release includes security fixes to both curl and OpenSSL.
5845 * [Fix transitive doctests when panic=abort][cargo/3021]
5846 * [Add --all-features flag to cargo][cargo/3038]
5847 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5848 * [Don't parse the home directory more than once][cargo/3078]
5849 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5850 * [Update OpenSSL to 1.0.2j][cargo/3121]
5851 * [Add license and license_file to cargo metadata output][cargo/3110]
5852 * [Make crates-io registry URL optional in config; ignore all changes to
5853 source.crates-io][cargo/3089]
5854 * [Don't download dependencies from other platforms][cargo/3123]
5855 * [Build transitive dev-dependencies when needed][cargo/3125]
5856 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5857 * [Avoid updating registry when adding existing deps][cargo/3144]
5858 * [Warn about path overrides that won't work][cargo/3136]
5859 * [Use workspaces during `cargo install`][cargo/3146]
5860 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5861 * [Add --message-format flag][cargo/3000]
5862 * [Pass target environment for rustdoc][cargo/3205]
5863 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5864 * [Update curl and curl-sys][cargo/3241]
5865 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5870 * [rustdoc: Add the `--sysroot` argument][36586]
5871 * [rustdoc: Fix a couple of issues with the search results][35655]
5872 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5873 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5874 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5879 * [Remove unmaintained style guide][35124]
5880 * [Add s390x support][36369]
5881 * [Initial work at Haiku OS support][36727]
5882 * [Add mips-uclibc targets][35734]
5883 * [Crate-ify compiler-rt into compiler-builtins][35021]
5884 * [Add rustc version info (git hash + date) to dist tarball][36213]
5885 * Many documentation improvements
5890 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5891 * [Deny (by default) transmuting from fn item types to pointer-sized
5892 types][34923]. Continuing the long transition to zero-sized fn items,
5894 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5896 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5897 * [Fix lifetime rules for 'if' conditions][36029].
5898 * [Inherit overflow checks for sum and product][36372].
5899 * [Forbid user-defined macros named "macro_rules"][36730].
5901 [33922]: https://github.com/rust-lang/rust/pull/33922
5902 [34623]: https://github.com/rust-lang/rust/pull/34623
5903 [34923]: https://github.com/rust-lang/rust/pull/34923
5904 [34942]: https://github.com/rust-lang/rust/pull/34942
5905 [34982]: https://github.com/rust-lang/rust/pull/34982
5906 [35021]: https://github.com/rust-lang/rust/pull/35021
5907 [35048]: https://github.com/rust-lang/rust/pull/35048
5908 [35074]: https://github.com/rust-lang/rust/pull/35074
5909 [35124]: https://github.com/rust-lang/rust/pull/35124
5910 [35234]: https://github.com/rust-lang/rust/pull/35234
5911 [35238]: https://github.com/rust-lang/rust/pull/35238
5912 [35354]: https://github.com/rust-lang/rust/pull/35354
5913 [35559]: https://github.com/rust-lang/rust/pull/35559
5914 [35585]: https://github.com/rust-lang/rust/pull/35585
5915 [35627]: https://github.com/rust-lang/rust/pull/35627
5916 [35655]: https://github.com/rust-lang/rust/pull/35655
5917 [35702]: https://github.com/rust-lang/rust/pull/35702
5918 [35707]: https://github.com/rust-lang/rust/pull/35707
5919 [35728]: https://github.com/rust-lang/rust/pull/35728
5920 [35734]: https://github.com/rust-lang/rust/pull/35734
5921 [35755]: https://github.com/rust-lang/rust/pull/35755
5922 [35761]: https://github.com/rust-lang/rust/pull/35761
5923 [35764]: https://github.com/rust-lang/rust/pull/35764
5924 [35814]: https://github.com/rust-lang/rust/pull/35814
5925 [35854]: https://github.com/rust-lang/rust/pull/35854
5926 [35871]: https://github.com/rust-lang/rust/pull/35871
5927 [35884]: https://github.com/rust-lang/rust/pull/35884
5928 [35911]: https://github.com/rust-lang/rust/pull/35911
5929 [35969]: https://github.com/rust-lang/rust/pull/35969
5930 [35975]: https://github.com/rust-lang/rust/pull/35975
5931 [36004]: https://github.com/rust-lang/rust/pull/36004
5932 [36008]: https://github.com/rust-lang/rust/pull/36008
5933 [36014]: https://github.com/rust-lang/rust/pull/36014
5934 [36029]: https://github.com/rust-lang/rust/pull/36029
5935 [36059]: https://github.com/rust-lang/rust/pull/36059
5936 [36072]: https://github.com/rust-lang/rust/pull/36072
5937 [36101]: https://github.com/rust-lang/rust/pull/36101
5938 [36104]: https://github.com/rust-lang/rust/pull/36104
5939 [36171]: https://github.com/rust-lang/rust/pull/36171
5940 [36173]: https://github.com/rust-lang/rust/pull/36173
5941 [36178]: https://github.com/rust-lang/rust/pull/36178
5942 [36213]: https://github.com/rust-lang/rust/pull/36213
5943 [36214]: https://github.com/rust-lang/rust/pull/36214
5944 [36264]: https://github.com/rust-lang/rust/pull/36264
5945 [36266]: https://github.com/rust-lang/rust/pull/36266
5946 [36289]: https://github.com/rust-lang/rust/pull/36289
5947 [36338]: https://github.com/rust-lang/rust/pull/36338
5948 [36351]: https://github.com/rust-lang/rust/pull/36351
5949 [36355]: https://github.com/rust-lang/rust/pull/36355
5950 [36369]: https://github.com/rust-lang/rust/pull/36369
5951 [36372]: https://github.com/rust-lang/rust/pull/36372
5952 [36423]: https://github.com/rust-lang/rust/pull/36423
5953 [36482]: https://github.com/rust-lang/rust/pull/36482
5954 [36505]: https://github.com/rust-lang/rust/pull/36505
5955 [36524]: https://github.com/rust-lang/rust/pull/36524
5956 [36527]: https://github.com/rust-lang/rust/pull/36527
5957 [36551]: https://github.com/rust-lang/rust/pull/36551
5958 [36574]: https://github.com/rust-lang/rust/pull/36574
5959 [36586]: https://github.com/rust-lang/rust/pull/36586
5960 [36592]: https://github.com/rust-lang/rust/pull/36592
5961 [36631]: https://github.com/rust-lang/rust/pull/36631
5962 [36639]: https://github.com/rust-lang/rust/pull/36639
5963 [36721]: https://github.com/rust-lang/rust/pull/36721
5964 [36727]: https://github.com/rust-lang/rust/pull/36727
5965 [36730]: https://github.com/rust-lang/rust/pull/36730
5966 [36734]: https://github.com/rust-lang/rust/pull/36734
5967 [36754]: https://github.com/rust-lang/rust/pull/36754
5968 [36995]: https://github.com/rust-lang/rust/pull/36995
5969 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5970 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5971 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5972 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5973 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5974 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5975 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5976 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5977 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5978 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5979 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5980 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5981 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5982 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5983 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5984 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5985 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5986 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5987 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5988 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5989 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5990 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5991 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5992 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5993 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5994 [rustup]: https://www.rustup.rs
5995 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5996 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5997 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5998 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5999 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6000 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6001 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6004 Version 1.12.1 (2016-10-20)
6005 ===========================
6010 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6011 * [Confusion with double negation and booleans][36856]
6012 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6013 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6014 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6015 * [Corrupted memory after updated to 1.12][36936]
6016 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6017 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6018 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6020 [36381]: https://github.com/rust-lang/rust/issues/36381
6021 [36856]: https://github.com/rust-lang/rust/issues/36856
6022 [36875]: https://github.com/rust-lang/rust/issues/36875
6023 [36924]: https://github.com/rust-lang/rust/issues/36924
6024 [36926]: https://github.com/rust-lang/rust/issues/36926
6025 [36936]: https://github.com/rust-lang/rust/issues/36936
6026 [37026]: https://github.com/rust-lang/rust/issues/37026
6027 [37112]: https://github.com/rust-lang/rust/issues/37112
6028 [37153]: https://github.com/rust-lang/rust/issues/37153
6031 Version 1.12.0 (2016-09-29)
6032 ===========================
6037 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6038 This translation pass is far simpler than the previous AST->LLVM pass, and
6039 creates opportunities to perform new optimizations directly on the MIR. It
6040 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6041 * [`rustc` presents a new, more readable error format, along with
6042 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6043 Most common editors supporting Rust have been updated to work with it. It was
6044 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6049 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6050 This translation pass is far simpler than the previous AST->LLVM pass, and
6051 creates opportunities to perform new optimizations directly on the MIR. It
6052 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6053 * [Print the Rust target name, not the LLVM target name, with
6054 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6055 * [The computation of `TypeId` is correct in some cases where it was previously
6056 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6057 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6058 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6059 `--print relocation-models`, and `--print code-models` print the available
6060 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6061 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6062 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6063 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6064 These targets produce statically-linked binaries. There are no binary release
6070 * [`rustc` presents a new, more readable error format, along with
6071 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6072 Most common editors supporting Rust have been updated to work with it. It was
6073 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6074 * [In error descriptions, references are now described in plain English,
6075 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6076 * [In error type descriptions, unknown numeric types are named `{integer}` or
6077 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6078 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6083 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6084 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6085 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6086 useful](https://github.com/rust-lang/rust/pull/34908)
6087 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6088 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6089 * [Semicolons are properly required as statement delimiters inside
6090 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6091 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6096 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6097 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6098 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6099 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6100 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6101 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6102 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6103 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6104 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6105 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6106 Both on Unix and Windows.
6107 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6108 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6109 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6110 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6111 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6112 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6113 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6114 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6119 * [The `format!` macro and friends now allow a single argument to be formatted
6120 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6121 * [The lifetime bounds on `[T]::binary_search_by` and
6122 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6123 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6124 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6125 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6126 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6127 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6128 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6129 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6130 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6131 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6132 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6133 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6134 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6135 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6136 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6137 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6138 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6139 * [`mpsc::sync_channel` `Receiver`s return any available message before
6140 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6141 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6142 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6147 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6148 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6149 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6150 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6151 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6152 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6153 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6154 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6155 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6156 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6157 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6158 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6159 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6160 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6161 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6162 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6167 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6168 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6173 * [Test binaries now support a `--test-threads` argument to specify the number
6174 of threads used to run tests, and which acts the same as the
6175 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6176 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6177 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6178 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6179 * [Rust releases now come with source packages that can be installed by rustup
6180 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6181 The resulting source code can be used by tools and IDES, located in the
6182 sysroot under `lib/rustlib/src`.
6187 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6188 * Many minor improvements to the documentation.
6189 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6194 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6195 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6196 * [When formatting strings, if "precision" is specified, the "fill",
6197 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6198 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6201 Version 1.11.0 (2016-08-18)
6202 ===========================
6207 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6208 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6209 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6210 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6215 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6216 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6217 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6218 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6219 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6220 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6221 (in libcore - previously stabilized in libstd)
6222 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6223 (in libcore - previously stabilized in libstd)
6224 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6225 (in libcore - previously stabilized in libstd)
6226 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6227 (in libcore - previously stabilized in libstd)
6228 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6229 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6230 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6231 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6236 * [The `thread_local!` macro supports multiple definitions in a single
6237 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6238 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6239 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6240 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6241 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6242 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6243 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6244 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6249 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6250 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6251 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6252 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6253 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6254 and `-vv` prints warnings for all crates.
6255 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6256 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6257 This provides room for expansion by arbitrary tools.
6258 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6259 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6260 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6261 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6262 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6263 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6264 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6269 * [Caching projections speeds up type check dramatically for some
6270 workloads](https://github.com/rust-lang/rust/pull/33816)
6271 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6272 This hasher is faster, but is believed to provide sufficient
6273 protection from collision attacks.
6274 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6279 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6280 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6281 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6282 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6283 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6288 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6289 * [When emitting debug info, rustc emits frame pointers for closures,
6290 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6291 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6292 * Many more errors have been given error codes and extended
6294 * API documentation continues to be improved, with many new examples
6299 * [rustc no longer hangs when dependencies recursively re-export
6300 submodules](https://github.com/rust-lang/rust/pull/34542)
6301 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6302 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6303 rewritten](https://github.com/rust-lang/rust/pull/33895)
6304 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6305 No targets use this yet, but it works toward AVR support.
6310 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6311 * [The new follow-set rules that place restrictions on `macro_rules!`
6312 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6313 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6314 and has been a warning since 1.10.
6315 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6316 This causes breakage in some corner cases.
6319 Version 1.10.0 (2016-07-07)
6320 ===========================
6325 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6326 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6327 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6328 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6329 * [`panic!` can be converted to a runtime abort with the
6330 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6331 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6332 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6333 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6334 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6335 Note that Cargo does not yet directly support cdylibs.
6340 * `os::windows::fs::OpenOptionsExt::access_mode`
6341 * `os::windows::fs::OpenOptionsExt::share_mode`
6342 * `os::windows::fs::OpenOptionsExt::custom_flags`
6343 * `os::windows::fs::OpenOptionsExt::attributes`
6344 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6345 * `os::unix::fs::OpenOptionsExt::custom_flags`
6346 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6347 * `Default for sync::Weak`
6348 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6349 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6350 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6351 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6352 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6353 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6354 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6355 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6356 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6357 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6358 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6359 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6360 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6361 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6362 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6363 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6364 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6365 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6366 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6367 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6368 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6369 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6370 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6371 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6372 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6373 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6374 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6375 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6376 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6377 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6378 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6379 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6380 * Read/Write/RawFd impls for `UnixStream`
6381 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6382 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6383 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6384 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6385 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6386 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6387 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6388 * RawFd impls for `UnixListener`
6389 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6390 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6391 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6392 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6393 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6394 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6395 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6396 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6397 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6398 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6399 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6400 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6401 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6402 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6403 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6404 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6405 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6406 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6407 * RawFd impls for `UnixDatagram`
6408 * `{BTree,Hash}Map::values_mut`
6409 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6414 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6415 The semantics of this minor method are subtle and probably not what
6417 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6418 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6419 will fall back to `/dev/urandom` temporarily to avoid blocking
6420 during early boot](https://github.com/rust-lang/rust/pull/33086).
6421 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6422 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6423 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6424 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6425 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6426 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6427 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6431 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6432 This controls the runtime behavior of the `panic!` macro
6433 and can be either "unwind" (the default), or "abort".
6434 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6435 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6436 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6437 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6438 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6439 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6440 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6441 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6442 By default they are retried twice, which can be customized with the
6443 `net.retry` value in `.cargo/config`.
6444 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6445 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6446 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6447 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6448 Makes it possible to install multiple crates in parallel.
6449 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6450 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6451 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6452 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6453 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6454 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6459 * [rustc memory usage was reduced by refactoring the context used for
6460 type checking](https://github.com/rust-lang/rust/pull/33425).
6461 * [Speed up creation of `HashMap`s by caching the random keys used
6462 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6463 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6464 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6465 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6466 10x faster than the previous lookup tables.
6467 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6472 * Many incremental improvements to documentation and rustdoc.
6473 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6474 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6475 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6476 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6477 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6478 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6479 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6484 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6485 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6486 * [`std` no longer prints backtraces on platforms where the running
6487 module must be loaded with `env::current_exe`, which can't be relied
6488 on](https://github.com/rust-lang/rust/pull/33554).
6489 * This release includes std binaries for the i586-unknown-linux-gnu,
6490 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6491 i586 target is for old x86 hardware without SSE2, and the armv7
6492 target is for Android running on modern ARM architectures.
6493 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6494 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6495 * [On Unix the runtime aborts by calling `libc::abort` instead of
6496 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6497 * [Rust is now bootstrapped from the previous release of Rust,
6498 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6503 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6504 * [`target_env` for Linux ARM targets is just `gnu`, not
6505 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6506 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6507 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6508 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6509 Affects how macros are parsed.
6510 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6511 * [Feature-gated attributes on macro-generated macro invocations are
6512 now rejected](https://github.com/rust-lang/rust/pull/32791).
6513 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6514 This caused some minor changes to type inference.
6517 Version 1.9.0 (2016-05-26)
6518 ==========================
6523 * The `#[deprecated]` attribute when applied to an API will generate
6524 warnings when used. The warnings may be suppressed with
6525 `#[allow(deprecated)]`. [RFC 1270].
6526 * [`fn` item types are zero sized, and each `fn` names a unique
6527 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6528 `transmute` on a `fn` type will generate a warning for a few cycles,
6529 then will be converted to an error.
6530 * [Field and method resolution understand visibility, so private
6531 fields and methods cannot prevent the proper use of public fields
6532 and methods][1.9fv].
6533 * [The parser considers unicode codepoints in the
6534 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6540 * [`std::panic::catch_unwind`] (renamed from `recover`)
6541 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6542 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6543 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6544 * [`str::is_char_boundary`]
6545 * [`<*const T>::as_ref`]
6546 * [`<*mut T>::as_ref`]
6547 * [`<*mut T>::as_mut`]
6548 * [`AsciiExt::make_ascii_uppercase`]
6549 * [`AsciiExt::make_ascii_lowercase`]
6550 * [`char::decode_utf16`]
6551 * [`char::DecodeUtf16`]
6552 * [`char::DecodeUtf16Error`]
6553 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6554 * [`BTreeSet::take`]
6555 * [`BTreeSet::replace`]
6558 * [`HashSet::replace`]
6560 * [`OsString::with_capacity`]
6561 * [`OsString::clear`]
6562 * [`OsString::capacity`]
6563 * [`OsString::reserve`]
6564 * [`OsString::reserve_exact`]
6565 * [`OsStr::is_empty`]
6567 * [`std::os::unix::thread`]
6570 * [`JoinHandleExt::as_pthread_t`]
6571 * [`JoinHandleExt::into_pthread_t`]
6572 * [`HashSet::hasher`]
6573 * [`HashMap::hasher`]
6574 * [`CommandExt::exec`]
6575 * [`File::try_clone`]
6576 * [`SocketAddr::set_ip`]
6577 * [`SocketAddr::set_port`]
6578 * [`SocketAddrV4::set_ip`]
6579 * [`SocketAddrV4::set_port`]
6580 * [`SocketAddrV6::set_ip`]
6581 * [`SocketAddrV6::set_port`]
6582 * [`SocketAddrV6::set_flowinfo`]
6583 * [`SocketAddrV6::set_scope_id`]
6584 * [`slice::copy_from_slice`]
6585 * [`ptr::read_volatile`]
6586 * [`ptr::write_volatile`]
6587 * [`OpenOptions::create_new`]
6588 * [`TcpStream::set_nodelay`]
6589 * [`TcpStream::nodelay`]
6590 * [`TcpStream::set_ttl`]
6591 * [`TcpStream::ttl`]
6592 * [`TcpStream::set_only_v6`]
6593 * [`TcpStream::only_v6`]
6594 * [`TcpStream::take_error`]
6595 * [`TcpStream::set_nonblocking`]
6596 * [`TcpListener::set_ttl`]
6597 * [`TcpListener::ttl`]
6598 * [`TcpListener::set_only_v6`]
6599 * [`TcpListener::only_v6`]
6600 * [`TcpListener::take_error`]
6601 * [`TcpListener::set_nonblocking`]
6602 * [`UdpSocket::set_broadcast`]
6603 * [`UdpSocket::broadcast`]
6604 * [`UdpSocket::set_multicast_loop_v4`]
6605 * [`UdpSocket::multicast_loop_v4`]
6606 * [`UdpSocket::set_multicast_ttl_v4`]
6607 * [`UdpSocket::multicast_ttl_v4`]
6608 * [`UdpSocket::set_multicast_loop_v6`]
6609 * [`UdpSocket::multicast_loop_v6`]
6610 * [`UdpSocket::set_multicast_ttl_v6`]
6611 * [`UdpSocket::multicast_ttl_v6`]
6612 * [`UdpSocket::set_ttl`]
6613 * [`UdpSocket::ttl`]
6614 * [`UdpSocket::set_only_v6`]
6615 * [`UdpSocket::only_v6`]
6616 * [`UdpSocket::join_multicast_v4`]
6617 * [`UdpSocket::join_multicast_v6`]
6618 * [`UdpSocket::leave_multicast_v4`]
6619 * [`UdpSocket::leave_multicast_v6`]
6620 * [`UdpSocket::take_error`]
6621 * [`UdpSocket::connect`]
6622 * [`UdpSocket::send`]
6623 * [`UdpSocket::recv`]
6624 * [`UdpSocket::set_nonblocking`]
6629 * [`std::sync::Once` is poisoned if its initialization function
6631 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6632 * [Most types implement `fmt::Debug`][1.9db].
6633 * [The default buffer size used by `BufReader` and `BufWriter` was
6634 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6635 used by other languages.
6636 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6637 `Duration` additionally implements `*=` and `/=`][1.9ta].
6638 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6639 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6640 * [`Chain` implements `BufRead`][1.9ch].
6641 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6646 * [Cargo can now run concurrently][1.9cc].
6647 * [Top-level overrides allow specific revisions of crates to be
6648 overridden through the entire crate graph][1.9ct]. This is intended
6649 to make upgrades easier for large projects, by allowing crates to be
6650 forked temporarily until they've been upgraded and republished.
6651 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6652 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6653 on the commandline][1.9cf]. `rustc` arguments can also be specified
6654 in the `build.rustflags` configuration key.
6659 * [The time complexity of comparing variables for equivalence during type
6660 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6661 to major compilation time improvement in some scenarios.
6662 * [`ToString` is specialized for `str`, giving it the same performance
6663 as `to_owned`][1.9ts].
6664 * [Spawning processes with `Command::output` no longer creates extra
6666 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6667 for C-like enums][1.9cl].
6672 * [Passing the `--quiet` flag to a test runner will produce
6673 much-abbreviated output][1.9q].
6674 * The Rust Project now publishes std binaries for the
6675 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6676 `i586-pc-windows-msvc` targets.
6681 * [`std::sync::Once` is poisoned if its initialization function
6683 * [It is illegal to define methods with the same name in overlapping
6684 inherent `impl` blocks][1.9sn].
6685 * [`fn` item types are zero sized, and each `fn` names a unique
6686 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6687 `transmute` on a `fn` type will generate a warning for a few cycles,
6688 then will be converted to an error.
6689 * [Improvements to const evaluation may trigger new errors when integer
6690 literals are out of range][1.9ce].
6693 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6694 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6695 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6696 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6697 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6698 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6699 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6700 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6701 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6702 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6703 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6704 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6705 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6706 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6707 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6708 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6709 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6710 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6711 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6712 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6713 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6714 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6715 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6716 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6717 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6718 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6719 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6720 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6721 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6722 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6723 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6724 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6725 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6726 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6727 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6728 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6729 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6730 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6731 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6732 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6733 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6734 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6735 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6736 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6737 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6738 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6739 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6740 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6741 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6742 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6743 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6744 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6745 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6746 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6747 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6748 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6749 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6750 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6751 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6752 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6753 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6754 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6755 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6756 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6757 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6758 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6759 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6760 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6761 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6762 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6763 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6764 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6765 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6766 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6767 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6768 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6769 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6770 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6771 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6772 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6773 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6774 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6775 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6776 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6777 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6778 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6779 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6780 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6781 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6782 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6783 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6784 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6785 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6786 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6787 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6788 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6789 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6790 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6791 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6792 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6793 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6794 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6795 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6796 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6797 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6798 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6799 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6800 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6801 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6802 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6805 Version 1.8.0 (2016-04-14)
6806 ==========================
6811 * Rust supports overloading of compound assignment statements like
6812 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6813 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6814 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6816 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6817 addition to the non-braced form, `struct Foo;`. [RFC 218].
6823 * [`str::encode_utf16`] (renamed from `utf16_units`)
6824 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6827 * [`ptr::drop_in_place`]
6829 * [`time::SystemTime`]
6831 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6832 * [`Instant::elapsed`]
6833 * [`SystemTime::now`]
6834 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6835 * [`SystemTime::elapsed`]
6836 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6837 * [`SystemTimeError`]
6838 * [`SystemTimeError::duration`]
6839 * Various impls for `SystemTimeError`
6841 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6842 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6843 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6844 * [The `write!` and `writeln!` macros correctly emit errors if any of
6845 their arguments can't be formatted][1.8w].
6846 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6847 * [The Unix-specific `raw` modules, which contain a number of
6848 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6849 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6850 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6851 across platforms was making it difficult to implement `std`
6852 correctly. Those that need these definitions should use the `libc`
6854 * The Unix-specific `MetadataExt` traits, including
6855 `os::unix::fs::MetadataExt`, which expose values such as inode
6856 numbers [no longer return platform-specific types][1.8r], but
6857 instead return widened integers. [RFC 1415].
6858 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6859 * [Atomic loads and stores are not volatile][1.8a].
6860 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6865 * [Inlining hash functions lead to a 3% compile-time improvement in
6866 some workloads][1.8h].
6867 * When using jemalloc, its symbols are [unprefixed so that it
6868 overrides the libc malloc implementation][1.8h]. This means that for
6869 rustc, LLVM is now using jemalloc, which results in a 6%
6870 compile-time improvement on a specific workload.
6871 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6876 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6877 i686-pc-windows-msvc is now considered a tier-1 platform.
6878 * [The `--print targets` flag prints a list of supported targets][1.8t].
6879 * [The `--print cfg` flag prints the `cfg`s defined for the current
6881 * [`rustc` can be built with an new Cargo-based build system, written
6882 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6883 build system. To enable it configure with `configure --rustbuild`.
6884 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6885 variants while also indicating the total number of missing variants
6886 if more than 3][1.8m].
6887 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6888 * The Rust Project now publishes binary releases of the standard
6889 library for a number of tier-2 targets:
6890 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6891 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6892 `x86_64-rumprun-netbsd`. These can be installed with
6893 tools such as [multirust][1.8mr].
6898 * [`cargo init` creates a new Cargo project in the current
6899 directory][1.8ci]. It is otherwise like `cargo new`.
6900 * [Cargo has configuration keys for `-v` and
6901 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6902 `[term]` section of `.cargo/config`.
6903 * [Configuration keys that evaluate to strings or integers can be set
6904 via environment variables][1.8ce]. For example the `build.jobs` key
6905 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6906 precedence over config files.
6907 * [Target-specific dependencies support Rust `cfg` syntax for
6908 describing targets][1.8cfg] so that dependencies for multiple
6909 targets can be specified together. [RFC 1361].
6910 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6911 `RUSTDOC` take precedence over the `build.target-dir`,
6912 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6913 * [The child process tree is killed on Windows when Cargo is
6915 * [The `build.target` configuration value sets the target platform,
6916 like `--target`][1.8ct].
6921 * [Unstable compiler flags have been further restricted][1.8u]. Since
6922 1.0 `-Z` flags have been considered unstable, and other flags that
6923 were considered unstable additionally required passing `-Z
6924 unstable-options` to access. Unlike unstable language and library
6925 features though, these options have been accessible on the stable
6926 release channel. Going forward, *new unstable flags will not be
6927 available on the stable release channel*, and old unstable flags
6928 will warn about their usage. In the future, all unstable flags will
6929 be unavailable on the stable release channel.
6930 * [It is no longer possible to `match` on empty enum variants using
6931 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6932 * The Unix-specific `MetadataExt` traits, including
6933 `os::unix::fs::MetadataExt`, which expose values such as inode
6934 numbers [no longer return platform-specific types][1.8r], but
6935 instead return widened integers. [RFC 1415].
6936 * [Modules sourced from the filesystem cannot appear within arbitrary
6937 blocks, but only within other modules][1.8mf].
6938 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6939 * On Unix, [stack overflow triggers a runtime abort instead of a
6941 * [`Command::spawn` and its equivalents return an error if any of
6942 its command-line arguments contain interior `NUL`s][1.8n].
6943 * [Tuple and unit enum variants from other crates are in the type
6945 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6946 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6947 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6948 instead of `foo.lib`.
6951 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6952 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6953 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6954 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6955 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6956 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6957 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6958 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6959 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6960 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6961 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6962 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6963 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6964 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6965 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6966 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6967 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6968 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6969 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6970 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6971 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6972 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6973 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6974 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6975 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6976 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6977 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6978 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6979 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6980 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6981 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6982 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6983 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6984 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6985 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6986 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6987 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6988 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6989 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6990 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6991 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6992 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6993 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6994 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6995 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6996 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6997 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6998 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6999 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7000 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7001 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7002 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7003 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7004 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7005 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7006 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7007 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7008 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7009 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7010 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7013 Version 1.7.0 (2016-03-03)
7014 ==========================
7021 * [`Path::strip_prefix`] (renamed from relative_from)
7022 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7024 * [`Ipv4Addr::is_loopback`]
7025 * [`Ipv4Addr::is_private`]
7026 * [`Ipv4Addr::is_link_local`]
7027 * [`Ipv4Addr::is_multicast`]
7028 * [`Ipv4Addr::is_broadcast`]
7029 * [`Ipv4Addr::is_documentation`]
7031 * [`Ipv6Addr::is_unspecified`]
7032 * [`Ipv6Addr::is_loopback`]
7033 * [`Ipv6Addr::is_multicast`]
7036 * [`Vec::as_mut_slice`]
7038 * [`String::as_str`]
7039 * [`String::as_mut_str`]
7041 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7043 * `<[T]>::`[`sort_by_key`]
7044 * checked, saturated, and overflowing operations
7045 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7046 * [`i32::saturating_mul`]
7047 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7048 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7049 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7050 * [`u32::saturating_mul`]
7051 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7052 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7053 * and checked, saturated, and overflowing operations for other primitive types
7055 * [`ffi::IntoStringError`]
7056 * [`CString::into_string`]
7057 * [`CString::into_bytes`]
7058 * [`CString::into_bytes_with_nul`]
7059 * `From<CString> for Vec<u8>`
7061 * [`IntoStringError::into_cstring`]
7062 * [`IntoStringError::utf8_error`]
7063 * `Error for IntoStringError`
7065 * [`std::hash::BuildHasher`]
7066 * [`BuildHasher::Hasher`]
7067 * [`BuildHasher::build_hasher`]
7068 * [`std::hash::BuildHasherDefault`]
7069 * [`HashMap::with_hasher`]
7070 * [`HashMap::with_capacity_and_hasher`]
7071 * [`HashSet::with_hasher`]
7072 * [`HashSet::with_capacity_and_hasher`]
7073 * [`std::collections::hash_map::RandomState`]
7074 * [`RandomState::new`]
7075 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7076 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7077 from bytes is faster.
7078 * [The performance of `LineWriter` (and thus `io::stdout`) was
7079 improved by using `memchr` to search for newlines][1.7m].
7080 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7081 `f64` variants were stabilized previously.
7082 * [`BTreeMap` was rewritten to use less memory and improve the performance
7083 of insertion and iteration, the latter by as much as 5x][1.7bm].
7084 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7085 covariant over their contained type][1.7bt].
7086 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7087 over their contained type][1.7ll].
7088 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7090 * [`Any` is implemented for unsized types][1.7a].
7091 * [`Hash` is implemented for `Duration`][1.7h].
7096 * [When running tests with `--test`, rustdoc will pass `--cfg`
7097 arguments to the compiler][1.7dt].
7098 * [The compiler is built with RPATH information by default][1.7rpa].
7099 This means that it will be possible to run `rustc` when installed in
7100 unusual configurations without configuring the dynamic linker search
7102 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7103 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7104 over `LD_LIBRARY_PATH`.
7109 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7110 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7111 * [The `rerun-if-changed` build script directive no longer causes the
7112 build script to incorrectly run twice in certain scenarios][1.7rr].
7117 * Soundness fixes to the interactions between associated types and
7118 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7119 code that violates the new rules. This is a significant change that
7120 is known to break existing code, so it has emitted warnings for the
7121 new error cases since 1.4 to give crate authors time to adapt. The
7122 details of what is changing are subtle; read the RFC for more.
7123 * [Several bugs in the compiler's visibility calculations were
7124 fixed][1.7v]. Since this was found to break significant amounts of
7125 code, the new errors will be emitted as warnings for several release
7126 cycles, under the `private_in_public` lint.
7127 * Defaulted type parameters were accidentally accepted in positions
7128 that were not intended. In this release, [defaulted type parameters
7129 appearing outside of type definitions will generate a
7130 warning][1.7d], which will become an error in future releases.
7131 * [Parsing "." as a float results in an error instead of 0][1.7p].
7132 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7133 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7135 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7136 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7137 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7138 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7139 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7140 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7141 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7142 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7143 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7144 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7145 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7146 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7147 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7148 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7149 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7150 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7151 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7152 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7153 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7154 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7155 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7156 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7157 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7158 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7159 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7160 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7161 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7162 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7163 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7164 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7165 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7166 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7167 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7168 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7169 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7170 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7171 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7172 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7173 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7174 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7175 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7176 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7177 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7178 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7179 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7180 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7181 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7182 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7183 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7184 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7185 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7186 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7187 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7188 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7189 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7190 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7191 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7192 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7193 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7194 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7195 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7196 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7197 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7198 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7199 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7200 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7201 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7202 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7203 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7204 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7205 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7206 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7207 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7208 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7209 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7210 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7211 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7212 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7213 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7216 Version 1.6.0 (2016-01-21)
7217 ==========================
7222 * The `#![no_std]` attribute causes a crate to not be linked to the
7223 standard library, but only the [core library][1.6co], as described
7224 in [RFC 1184]. The core library defines common types and traits but
7225 has no platform dependencies whatsoever, and is the basis for Rust
7226 software in environments that cannot support a full port of the
7227 standard library, such as operating systems. Most of the core
7228 library is now stable.
7234 [`Read::read_exact`],
7235 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7236 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7237 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7238 [`os::unix::fs::DirBuilderExt`],
7239 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7240 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7241 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7242 [`collections::hash_map::Drain`],
7243 [`collections::hash_map::HashMap::drain`],
7244 [`collections::hash_set::Drain`],
7245 [`collections::hash_set::HashSet::drain`],
7246 [`collections::binary_heap::Drain`],
7247 [`collections::binary_heap::BinaryHeap::drain`],
7248 [`Vec::extend_from_slice`] (renamed from `push_all`),
7249 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7250 [`RwLock::into_inner`],
7251 [`Iterator::min_by_key`] (renamed from `min_by`),
7252 [`Iterator::max_by_key`] (renamed from `max_by`).
7253 * The [core library][1.6co] is stable, as are most of its APIs.
7254 * [The `assert_eq!` macro supports arguments that don't implement
7255 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7257 * Several timer functions that take duration in milliseconds [are
7258 deprecated in favor of those that take `Duration`][1.6ms]. These
7259 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7260 `thread::park_timeout_ms`.
7261 * The algorithm by which `Vec` reserves additional elements was
7262 [tweaked to not allocate excessive space][1.6a] while still growing
7264 * `From` conversions are [implemented from integers to floats][1.6f]
7265 in cases where the conversion is lossless. Thus they are not
7266 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7267 or `f64`. They are also not implemented for `isize` and `usize`
7268 because the implementations would be platform-specific. `From` is
7269 also implemented from `f32` to `f64`.
7270 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7271 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7272 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7273 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7275 * Sorting slices that are already sorted [is 50% faster in some
7281 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7282 * Cargo build scripts can specify their dependencies by emitting the
7283 [`rerun-if-changed`][1.6rr] key.
7284 * crates.io will reject publication of crates with dependencies that
7285 have a wildcard version constraint. Crates with wildcard
7286 dependencies were seen to cause a variety of problems, as described
7287 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7289 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7290 release folder. A variety of artifacts that Cargo failed to clean
7291 are now correctly deleted.
7296 * The `unreachable_code` lint [warns when a function call's argument
7298 * The parser indicates [failures that may be caused by
7299 confusingly-similar Unicode characters][1.6uc]
7300 * Certain macro errors [are reported at definition time][1.6m], not
7306 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7307 environment variable when locating crates. This was a pre-cargo
7308 feature for integrating with the package manager that was
7309 accidentally never removed.
7310 * [A number of bugs were fixed in the privacy checker][1.6p] that
7311 could cause previously-accepted code to break.
7312 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7313 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7314 struct pattern syntax (`Foo(..)`) can no longer be used to match
7315 unit structs. This is a warning now, but will become an error in
7316 future releases. Patterns that share the same name as a const are
7318 * A bug was fixed that causes [rustc not to apply default type
7319 parameters][1.6xc] when resolving certain method implementations of
7320 traits defined in other crates.
7322 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7323 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7324 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7325 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7326 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7327 [1.6co]: http://doc.rust-lang.org/core/index.html
7328 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7329 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7330 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7331 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7332 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7333 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7334 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7335 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7336 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7337 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7338 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7339 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7340 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7341 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7342 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7343 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7344 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7345 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7346 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7347 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7348 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7349 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7350 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7351 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7352 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7353 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7354 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7355 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7356 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7357 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7358 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7359 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7360 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7361 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7362 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7363 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7364 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7365 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7366 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7367 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7368 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7371 Version 1.5.0 (2015-12-10)
7372 ==========================
7374 * ~700 changes, numerous bugfixes
7380 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7381 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7382 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7383 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7384 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7385 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7386 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7387 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7388 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7389 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7390 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7391 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7392 [`Path::read_link`], [`Path::symlink_metadata`],
7393 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7394 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7395 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7396 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7397 [`slice::split_first_mut`], [`slice::split_first`],
7398 [`slice::split_last_mut`], [`slice::split_last`],
7399 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7400 [`str::MatchIndices`], [`str::RMatchIndices`],
7401 [`str::match_indices`], [`str::rmatch_indices`],
7402 [`str::slice_mut_unchecked`], [`string::ParseError`].
7403 * Rust applications hosted on crates.io can be installed locally to
7404 `~/.cargo/bin` with the [`cargo install`] command. Among other
7405 things this makes it easier to augment Cargo with new subcommands:
7406 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7407 invoked as `cargo foo`.
7408 * Crates with wildcard (`*`) dependencies will [emit warnings when
7409 published][1.5w]. In 1.6 it will no longer be possible to publish
7410 crates with wildcard dependencies.
7415 * The rules determining when a particular lifetime must outlive
7416 a particular value (known as '[dropck]') have been [modified
7417 to not rely on parametricity][1.5p].
7418 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7419 and `Arc`][1.5a]. Because these smart pointer types implement
7420 `Deref`, this causes breakage in cases where the interior type
7421 contains methods of the same name.
7422 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7423 that they could drop their content. Soundness fix.
7424 * All method invocations are [properly checked][1.5wf1] for
7425 [well-formedness][1.5wf2]. Soundness fix.
7426 * Traits whose supertraits contain `Self` are [not object
7427 safe][1.5o]. Soundness fix.
7428 * Target specifications support a [`no_default_libraries`][1.5nd]
7429 setting that controls whether `-nodefaultlibs` is passed to the
7430 linker, and in turn the `is_like_windows` setting no longer affects
7431 the `-nodefaultlibs` flag.
7432 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7433 * The `#[inline]` and `#[repr]` attributes [can only appear
7434 in valid locations][1.5at].
7435 * Native libraries linked from the local crate are [passed to
7436 the linker before native libraries from upstream crates][1.5nl].
7437 * Two rarely-used attributes, `#[no_debug]` and
7438 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7439 * Negation of unsigned integers, which has been a warning for
7440 several releases, [is now behind a feature gate and will
7441 generate errors][1.5nu].
7442 * The parser accidentally accepted visibility modifiers on
7443 enum variants, a bug [which has been fixed][1.5ev].
7444 * [A bug was fixed that allowed `use` statements to import unstable
7450 * When evaluating expressions at compile-time that are not
7451 compile-time constants (const-evaluating expressions in non-const
7452 contexts), incorrect code such as overlong bitshifts and arithmetic
7453 overflow will [generate a warning instead of an error][1.5ce],
7454 delaying the error until runtime. This will allow the
7455 const-evaluator to be expanded in the future backwards-compatibly.
7456 * The `improper_ctypes` lint [no longer warns about using `isize` and
7457 `usize` in FFI][1.5ict].
7462 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7464 * `Default` is [implemented for mutable slices][1.5d].
7465 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7466 * There are now `From` conversions [between floating point
7467 types][1.5f] where the conversions are lossless.
7468 * There are now `From` conversions [between integer types][1.5i] where
7469 the conversions are lossless.
7470 * [`fs::Metadata` implements `Clone`][1.5fs].
7471 * The `parse` method [accepts a leading "+" when parsing
7473 * [`AsMut` is implemented for `Vec`][1.5am].
7474 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7475 been optimized][1.5cf] and no longer rely on the default impl.
7476 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7477 `unsafe extern "C"` function types now [implement `Clone`,
7478 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7479 `fmt::Debug` for up to 12 arguments][1.5fp].
7480 * [Dropping `Vec`s is much faster in unoptimized builds when the
7481 element types don't implement `Drop`][1.5dv].
7482 * A bug that caused in incorrect behavior when [combining `VecDeque`
7483 with zero-sized types][1.5vdz] was resolved.
7484 * [`PartialOrd` for slices is faster][1.5po].
7489 * [Crate metadata size was reduced by 20%][1.5md].
7490 * [Improvements to code generation reduced the size of libcore by 3.3
7491 MB and rustc's memory usage by 18MB][1.5m].
7492 * [Improvements to deref translation increased performance in
7493 unoptimized builds][1.5dr].
7494 * Various errors in trait resolution [are deduplicated to only be
7495 reported once][1.5te].
7496 * Rust has preliminary [support for rumprun kernels][1.5rr].
7497 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7499 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7500 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7501 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7502 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7503 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7504 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7505 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7506 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7507 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7508 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7509 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7510 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7511 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7512 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7513 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7514 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7515 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7516 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7517 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7518 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7519 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7520 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7521 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7522 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7523 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7524 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7525 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7526 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7527 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7528 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7529 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7530 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7531 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7532 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7533 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7534 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7535 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7536 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7537 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7538 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7539 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7540 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7541 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7542 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7543 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7544 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7545 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7546 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7547 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7548 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7549 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7550 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7551 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7552 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7553 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7554 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7555 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7556 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7557 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7558 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7559 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7560 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7561 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7562 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7563 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7564 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7565 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7566 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7567 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7568 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7569 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7570 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7571 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7572 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7573 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7574 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7575 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7576 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7577 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7578 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7579 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7580 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7581 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7582 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7583 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7584 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7585 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7586 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7587 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7589 Version 1.4.0 (2015-10-29)
7590 ==========================
7592 * ~1200 changes, numerous bugfixes
7597 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7598 GNU) are now supported and recommended for use.
7603 * [Several changes have been made to fix type soundness and improve
7604 the behavior of associated types][sound]. See [RFC 1214]. Although
7605 we have mostly introduced these changes as warnings this release, to
7606 become errors next release, there are still some scenarios that will
7607 see immediate breakage.
7608 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7609 line breaks in addition to `\n`][crlf].
7610 * [Loans of `'static` lifetime extend to the end of a function][stat].
7611 * [`str::parse` no longer introduces avoidable rounding error when
7612 parsing floating point numbers. Together with earlier changes to
7613 float formatting/output, "round trips" like f.to_string().parse()
7614 now preserve the value of f exactly. Additionally, leading plus
7615 signs are now accepted][fp3].
7621 * `use` statements that import multiple items [can now rename
7622 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7623 * [Binops work correctly on fat pointers][binfat].
7624 * `pub extern crate`, which does not behave as expected, [issues a
7625 warning][pec] until a better solution is found.
7630 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7631 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7632 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7633 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7634 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7635 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7636 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7637 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7638 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7639 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7640 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7641 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7642 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7643 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7644 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7645 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7646 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7647 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7649 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7650 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7651 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7652 `f64::from_str_radix`.
7653 * [Reverse-searching strings is faster with the 'two-way'
7655 * [`std::io::copy` allows `?Sized` arguments][cc].
7656 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7657 [override `count`, `nth` and `last` with an O(1)
7658 implementation][it].
7659 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7660 * [`IntoRawFd` has been added to the Unix-specific prelude,
7661 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7663 * [`Extend<String>` and `FromIterator<String` are both implemented for
7665 * [`IntoIterator` is implemented for references to `Option` and
7667 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7668 Copy`][ext] as part of [RFC 839]. This will cause type inference
7669 breakage in rare situations.
7670 * [`BinaryHeap` implements `Debug`][bh2].
7671 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7673 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7674 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7675 * [String comparison is faster][faststr].
7676 * `&mut T` where `T: std::fmt::Write` [also implements
7677 `std::fmt::Write`][mutw].
7678 * [A stable regression in `VecDeque::push_back` and other
7679 capacity-altering methods that caused panics for zero-sized types
7681 * [Function pointers implement traits for up to 12 parameters][fp2].
7686 * The compiler [no longer uses the 'morestack' feature to prevent
7687 stack overflow][mm]. Instead it uses guard pages and stack
7688 probes (though stack probes are not yet implemented on any platform
7690 * [The compiler matches traits faster when projections are involved][p].
7691 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7693 * [Cargo now displays useful information about what its doing during
7694 `cargo update`][cu].
7696 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7697 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7698 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7699 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7700 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7701 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7702 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7703 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7704 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7705 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7706 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7707 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7708 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7709 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7710 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7711 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7712 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7713 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7714 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7715 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7716 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7717 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7718 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7719 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7720 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7721 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7722 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7723 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7724 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7725 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7726 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7727 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7728 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7729 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7730 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7731 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7732 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7733 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7734 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7735 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7736 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7737 [bh2]: https://github.com/rust-lang/rust/pull/28156
7738 [binfat]: https://github.com/rust-lang/rust/pull/28270
7739 [bm]: https://github.com/rust-lang/rust/pull/28197
7740 [cc]: https://github.com/rust-lang/rust/pull/27531
7741 [crlf]: https://github.com/rust-lang/rust/pull/28034
7742 [cu]: https://github.com/rust-lang/cargo/pull/1931
7743 [d]: https://github.com/rust-lang/rust/pull/27825
7744 [dep]: https://github.com/rust-lang/rust/pull/28339
7745 [es]: https://github.com/rust-lang/rust/pull/27956
7746 [ext]: https://github.com/rust-lang/rust/pull/28094
7747 [faststr]: https://github.com/rust-lang/rust/pull/28338
7748 [ffi]: https://github.com/rust-lang/rust/pull/28779
7749 [fp]: https://github.com/rust-lang/rust/pull/28268
7750 [fp2]: https://github.com/rust-lang/rust/pull/28560
7751 [fp3]: https://github.com/rust-lang/rust/pull/27307
7752 [i]: https://github.com/rust-lang/rust/pull/27451
7753 [into2]: https://github.com/rust-lang/rust/pull/28039
7754 [it]: https://github.com/rust-lang/rust/pull/27652
7755 [mm]: https://github.com/rust-lang/rust/pull/27338
7756 [mutw]: https://github.com/rust-lang/rust/pull/28368
7757 [sound]: https://github.com/rust-lang/rust/pull/27641
7758 [p]: https://github.com/rust-lang/rust/pull/27866
7759 [pec]: https://github.com/rust-lang/rust/pull/28486
7760 [pr]: https://github.com/rust-lang/rust/pull/27896
7761 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7762 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7763 [s]: https://github.com/rust-lang/rust/pull/27474
7764 [stab]: https://github.com/rust-lang/rust/pull/28339
7765 [stat]: https://github.com/rust-lang/rust/pull/28321
7766 [vd]: https://github.com/rust-lang/rust/pull/28494
7768 Version 1.3.0 (2015-09-17)
7769 ==============================
7771 * ~900 changes, numerous bugfixes
7776 * The [new object lifetime defaults][nold] have been [turned
7777 on][nold2] after a cycle of warnings about the change. Now types
7778 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7779 being interpreted as `&'a Box<Trait+'a>` to `&'a
7780 Box<Trait+'static>`.
7781 * [The Rustonomicon][nom] is a new book in the official documentation
7782 that dives into writing unsafe Rust.
7783 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7784 timekeeping is employed by other std APIs, as well as out-of-tree
7790 * The [new object lifetime defaults][nold] have been [turned
7791 on][nold2] after a cycle of warnings about the change.
7792 * There is a known [regression][lr] in how object lifetime elision is
7793 interpreted, the proper solution for which is undetermined.
7794 * The `#[prelude_import]` attribute, an internal implementation
7795 detail, was accidentally stabilized previously. [It has been put
7796 behind the `prelude_import` feature gate][pi]. This change is
7797 believed to break no existing code.
7798 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7799 [more sane for dynamically sized types][dst3]. Code that relied on
7800 the previous behavior is thought to be broken.
7801 * The `dropck` rules, which checks that destructors can't access
7802 destroyed values, [have been updated][dropck] to match the
7803 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7804 cause some previously-compiling code to no longer build.
7809 * The [new object lifetime defaults][nold] have been [turned
7810 on][nold2] after a cycle of warnings about the change.
7811 * Semicolons may [now follow types and paths in
7812 macros](https://github.com/rust-lang/rust/pull/27000).
7813 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7814 [more sane for dynamically sized types][dst3]. Code that relied on
7815 the previous behavior is not known to exist, and suspected to be
7817 * `'static` variables [may now be recursive][st].
7818 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7819 implementations correctly.
7820 * The `dropck` rules, which checks that destructors can't access
7821 destroyed values, [have been updated][dropck] to match the
7827 * The [`Duration`] API, [has been stabilized][ds], as well as the
7828 `std::time` module, which presently contains only `Duration`.
7829 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7830 * The owned C string, [`CString`], implements [`Borrow`] and the
7831 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7832 these allow C strings to be borrowed and cloned in generic code.
7833 * [`CStr`] implements [`Debug`].
7834 * [`AtomicPtr`] implements [`Debug`].
7835 * [`Error`] trait objects [can be downcast to their concrete types][e]
7836 in many common configurations, using the [`is`], [`downcast`],
7837 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7839 * Searching for substrings now [employs the two-way algorithm][search]
7840 instead of doing a naive search. This gives major speedups to a
7841 number of methods, including [`contains`][sc], [`find`][sf],
7842 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7843 [`ends_with`][sew] are also faster.
7844 * The performance of `PartialEq` for slices is [much faster][ps].
7845 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7846 is overridden and optimized by the implementations for scalars.
7847 * The [`Hasher`] trait now has a number of specialized `write_*`
7848 methods for primitive types, for efficiency.
7849 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7850 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7851 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7852 of [`std::error::Error::cause`][iec] also delegates to the inner
7854 * [`process::Child`][pc] gained the [`id`] method, which returns a
7855 `u32` representing the platform-specific process identifier.
7856 * The [`connect`] method on slices is deprecated, replaced by the new
7857 [`join`] method (note that both of these are on the *unstable*
7858 [`SliceConcatExt`] trait, but through the magic of the prelude are
7859 available to stable code anyway).
7860 * The [`Div`] operator is implemented for [`Wrapping`] types.
7861 * [`DerefMut` is implemented for `String`][dms].
7862 * Performance of SipHash (the default hasher for `HashMap`) is
7863 [better for long data][sh].
7864 * [`AtomicPtr`] implements [`Send`].
7865 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7866 are now [specialized to use uninitialized buffers for increased
7868 * Lifetime parameters of foreign functions [are now resolved
7874 * Rust can now, with some coercion, [produce programs that run on
7875 Windows XP][xp], though XP is not considered a supported platform.
7876 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7877 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7878 recommended for use in 1.3, though should be fully-functional
7879 in the [64-bit 1.4 beta][b14].
7880 * On Fedora-based systems installation will [properly configure the
7881 dynamic linker][fl].
7882 * The compiler gained many new extended error descriptions, which can
7883 be accessed with the `--explain` flag.
7884 * The `dropck` pass, which checks that destructors can't access
7885 destroyed values, [has been rewritten][dropck]. This fixes some
7886 soundness holes, and as such will cause some previously-compiling
7887 code to no longer build.
7888 * `rustc` now uses [LLVM to write archive files where possible][ar].
7889 Eventually this will eliminate the compiler's dependency on the ar
7891 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7892 supported FreeBSD on x86_64).
7893 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7894 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7896 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7897 will kill the process instead of leaking][nlp].
7899 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7900 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7901 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7902 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7903 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7904 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7905 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7906 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7907 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7908 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7909 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7910 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7911 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7912 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7913 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7914 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7915 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7916 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7917 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7918 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7919 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7920 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7921 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7922 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7923 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7924 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7925 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7926 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7927 [ar]: https://github.com/rust-lang/rust/pull/26926
7928 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7929 [dms]: https://github.com/rust-lang/rust/pull/26241
7930 [dropck]: https://github.com/rust-lang/rust/pull/27261
7931 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7932 [ds]: https://github.com/rust-lang/rust/pull/26818
7933 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7934 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7935 [dst3]: https://github.com/rust-lang/rust/pull/27351
7936 [e]: https://github.com/rust-lang/rust/pull/24793
7937 [f]: https://github.com/rust-lang/rust/pull/26588
7938 [fb]: https://github.com/rust-lang/rust/pull/26959
7939 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7940 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7941 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7942 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7943 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7944 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7945 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7946 [lic]: https://github.com/rust-lang/rust/pull/26583
7947 [lnu]: https://github.com/rust-lang/rust/pull/27026
7948 [lr]: https://github.com/rust-lang/rust/issues/27248
7949 [lum]: https://github.com/rust-lang/rust/pull/26378
7950 [lur]: https://github.com/rust-lang/rust/pull/26783
7951 [nlp]: https://github.com/rust-lang/rust/pull/27176
7952 [nold2]: https://github.com/rust-lang/rust/pull/27045
7953 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7954 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7955 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7956 [pi]: https://github.com/rust-lang/rust/pull/26699
7957 [ps]: https://github.com/rust-lang/rust/pull/26884
7958 [rte]: https://github.com/rust-lang/rust/pull/26950
7959 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7960 [search]: https://github.com/rust-lang/rust/pull/26327
7961 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7962 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7963 [sh]: https://github.com/rust-lang/rust/pull/27280
7964 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7965 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7966 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7967 [st]: https://github.com/rust-lang/rust/pull/26630
7968 [win1]: https://github.com/rust-lang/rust/pull/26569
7969 [win2]: https://github.com/rust-lang/rust/pull/26741
7970 [win3]: https://github.com/rust-lang/rust/pull/26741
7971 [win4]: https://github.com/rust-lang/rust/pull/27210
7972 [xp]: https://github.com/rust-lang/rust/pull/26569
7974 Version 1.2.0 (2015-08-07)
7975 ==========================
7977 * ~1200 changes, numerous bugfixes
7982 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7983 like `Rc` to contain types without a fixed size, arrays and trait
7984 objects, finally enabling use of `Rc<[T]>` and completing the
7985 implementation of DST.
7986 * [Parallel codegen][parcodegen] is now working again, which can
7987 substantially speed up large builds in debug mode; It also gets
7988 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7989 jobs). It's not enabled by default, but will be "in the near
7990 future". It can be activated with the `-C codegen-units=N` flag to
7992 * This is the first release with [experimental support for linking
7993 with the MSVC linker and lib C on Windows (instead of using the GNU
7994 variants via MinGW)][win]. It is yet recommended only for the most
7995 intrepid Rustaceans.
7996 * Benchmark compilations are showing a 30% improvement in
7997 bootstrapping over 1.1.
8002 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8003 unicode case mapping, which is a previously-planned change in
8004 behavior and considered a bugfix.
8005 * [`mem::align_of`] now specifies [the *minimum alignment* for
8006 T][align], which is usually the alignment programs are interested
8007 in, and the same value reported by clang's
8008 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8010 * [The `#[packed]` attribute is no longer silently accepted by the
8011 compiler][packed]. This attribute did nothing and code that
8012 mentioned it likely did not work as intended.
8013 * Associated type defaults are [now behind the
8014 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8015 defaults *did not work*, but could be mentioned syntactically. As
8016 such this breakage has minimal impact.
8021 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8022 matching against dereferenceable values.
8027 * The [`Extend`] trait, which grows a collection from an iterator, is
8028 implemented over iterators of references, for `String`, `Vec`,
8029 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8030 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8031 * The [`iter::once`] function returns an iterator that yields a single
8032 element, and [`iter::empty`] returns an iterator that yields no
8034 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8035 over substring matches.
8036 * [`Cell`] and [`RefCell`] both implement `Eq`.
8037 * A number of methods for wrapping arithmetic are added to the
8038 integral types, [`wrapping_div`], [`wrapping_rem`],
8039 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8040 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8041 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8042 type.. It is illegal for the default arithmetic operations in Rust
8043 to overflow; the desire to wrap must be explicit.
8044 * The `{:#?}` formatting specifier [displays the alternate,
8045 pretty-printed][debugfmt] form of the `Debug` formatter. This
8046 feature was actually introduced prior to 1.0 with little
8048 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8049 for writing data to formatted strings, similar to [`io::Write`].
8050 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8051 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8052 are used by code generators to emit implementations of [`Debug`].
8053 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8054 methods that convert case, following Unicode case mapping.
8055 * It is now easier to handle poisoned locks. The [`PoisonError`]
8056 type, returned by failing lock operations, exposes `into_inner`,
8057 `get_ref`, and `get_mut`, which all give access to the inner lock
8058 guard, and allow the poisoned lock to continue to operate. The
8059 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8060 poisoned lock without attempting to take the lock.
8061 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8062 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8063 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8064 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8066 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8072 * `rustc` employs smarter heuristics for guessing at [typos].
8073 * `rustc` emits more efficient code for [no-op conversions between
8074 unsafe pointers][nop].
8075 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8076 resulting in faster compile times and smaller code.
8078 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8079 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8080 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8081 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8082 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8083 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8084 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8085 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8086 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8087 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8088 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8089 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8090 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8091 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8092 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8093 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8094 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8095 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8096 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8097 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8098 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8099 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8100 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8101 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8102 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8103 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8104 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8105 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8106 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8107 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8108 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8109 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8110 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8111 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8112 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8113 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8114 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8115 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8116 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8117 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8118 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8119 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8120 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8121 [align]: https://github.com/rust-lang/rust/pull/25646
8122 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8123 [typos]: https://github.com/rust-lang/rust/pull/26087
8124 [nop]: https://github.com/rust-lang/rust/pull/26336
8125 [fat]: https://github.com/rust-lang/rust/pull/26411
8126 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8127 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8128 [packed]: https://github.com/rust-lang/rust/pull/25541
8129 [ad]: https://github.com/rust-lang/rust/pull/27382
8130 [win]: https://github.com/rust-lang/rust/pull/25350
8132 Version 1.1.0 (2015-06-25)
8133 =========================
8135 * ~850 changes, numerous bugfixes
8140 * The [`std::fs` module has been expanded][fs] to expand the set of
8141 functionality exposed:
8142 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8143 don't incur a syscall on some platforms.
8144 * A `symlink_metadata` function has been added.
8145 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8146 access to all underlying information.
8147 * The compiler now contains extended explanations of many errors. When an error
8148 with an explanation occurs the compiler suggests using the `--explain` flag
8149 to read the explanation. Error explanations are also [available online][err-index].
8150 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8151 well as other work, the time to bootstrap the compiler decreased by
8157 * The [`str::split_whitespace`] method splits a string on unicode
8158 whitespace boundaries.
8159 * On both Windows and Unix, new extension traits provide conversion of
8160 I/O types to and from the underlying system handles. On Unix, these
8161 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8162 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8163 `TcpListener`, and `UpdSocket`. Further implementations for
8164 `std::process` will be stabilized later.
8165 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8166 Windows, symlinks can be created with
8167 `std::os::windows::symlink_dir` and
8168 `std::os::windows::symlink_file`.
8169 * The `mpsc::Receiver` type can now be converted into an iterator with
8170 `into_iter` on the [`IntoIterator`] trait.
8171 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8172 implementation of the [`From`] trait.
8173 * The `Debug` implementation for `RangeFull` [creates output that is
8174 more consistent with other implementations][rf].
8175 * [`Debug` is implemented for `File`][file].
8176 * The `Default` implementation for `Arc` [no longer requires `Sync +
8178 * [The `Iterator` methods `count`, `nth`, and `last` have been
8179 overridden for slices to have O(1) performance instead of O(n)][si].
8180 * Incorrect handling of paths on Windows has been improved in both the
8181 compiler and the standard library.
8182 * [`AtomicPtr` gained a `Default` implementation][ap].
8183 * In accordance with Rust's policy on arithmetic overflow `abs` now
8184 [panics on overflow when debug assertions are enabled][abs].
8185 * The [`Cloned`] iterator, which was accidentally left unstable for
8186 1.0 [has been stabilized][c].
8187 * The [`Incoming`] iterator, which iterates over incoming TCP
8188 connections, and which was accidentally unnamable in 1.0, [is now
8189 properly exported][inc].
8190 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8191 `sift_up` or `sift_down` panic][bh].
8192 * The [`split_off`] method of `LinkedList` [no longer corrupts
8193 the list in certain scenarios][ll].
8198 * Type checking performance [has improved notably][sk] with
8199 [multiple improvements][pre].
8200 * The compiler [suggests code changes][ch] for more errors.
8201 * rustc and it's build system have experimental support for [building
8202 toolchains against MUSL][m] instead of glibc on Linux.
8203 * The compiler defines the `target_env` cfg value, which is used for
8204 distinguishing toolchains that are otherwise for the same
8205 platform. Presently this is set to `gnu` for common GNU Linux
8206 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8207 * The [`cargo rustc`][crc] command invokes a build with custom flags
8209 * [Android executables are always position independent][pie].
8210 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8213 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8214 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8215 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8216 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8217 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8218 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8219 [rf]: https://github.com/rust-lang/rust/pull/24491
8220 [err-index]: https://doc.rust-lang.org/error-index.html
8221 [sk]: https://github.com/rust-lang/rust/pull/24615
8222 [pre]: https://github.com/rust-lang/rust/pull/25323
8223 [file]: https://github.com/rust-lang/rust/pull/24598
8224 [ch]: https://github.com/rust-lang/rust/pull/24683
8225 [arc]: https://github.com/rust-lang/rust/pull/24695
8226 [si]: https://github.com/rust-lang/rust/pull/24701
8227 [ap]: https://github.com/rust-lang/rust/pull/24834
8228 [m]: https://github.com/rust-lang/rust/pull/24777
8229 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8230 [crc]: https://github.com/rust-lang/cargo/pull/1568
8231 [pie]: https://github.com/rust-lang/rust/pull/24953
8232 [abs]: https://github.com/rust-lang/rust/pull/25441
8233 [c]: https://github.com/rust-lang/rust/pull/25496
8234 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8235 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8236 [inc]: https://github.com/rust-lang/rust/pull/25522
8237 [bh]: https://github.com/rust-lang/rust/pull/25856
8238 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8239 [ll]: https://github.com/rust-lang/rust/pull/26022
8240 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8241 [drop]: https://github.com/rust-lang/rust/pull/24935
8243 Version 1.0.0 (2015-05-15)
8244 ========================
8246 * ~1500 changes, numerous bugfixes
8251 * The vast majority of the standard library is now `#[stable]`. It is
8252 no longer possible to use unstable features with a stable build of
8254 * Many popular crates on [crates.io] now work on the stable release
8256 * Arithmetic on basic integer types now [checks for overflow in debug
8262 * Several [restrictions have been added to trait coherence][coh] in
8263 order to make it easier for upstream authors to change traits
8264 without breaking downstream code.
8265 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8266 improve error messages and macro behavior. For example, `0b1234` is
8267 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8268 * Trait bounds [are always invariant][inv], eliminating the need for
8269 the `PhantomFn` and `MarkerTrait` lang items, which have been
8271 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8272 "foo" as bar` syntax has been replaced with `extern crate foo as
8273 bar`, and Cargo now automatically translates "-" in *package* names
8274 to underscore for the crate name.
8275 * [Lifetime shadowing is an error][lt].
8276 * [`Send` no longer implies `'static`][send-rfc].
8277 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8278 `MyType::default()`.
8279 * Primitive types [now have inherent methods][prim-inherent],
8280 obviating the need for extension traits like `SliceExt`.
8281 * Methods with `Self: Sized` in their `where` clause are [considered
8282 object-safe][self-sized], allowing many extension traits like
8283 `IteratorExt` to be merged into the traits they extended.
8284 * You can now [refer to associated types][assoc-where] whose
8285 corresponding trait bounds appear only in a `where` clause.
8286 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8287 like `Send` and `Sync` are now library-defined.
8288 * A [Reflect trait][reflect] was introduced, which means that
8289 downcasting via the `Any` trait is effectively limited to concrete
8290 types. This helps retain the potentially-important "parametricity"
8291 property: generic code cannot behave differently for different type
8292 arguments except in minor ways.
8293 * The `unsafe_destructor` feature is now deprecated in favor of the
8294 [new `dropck`][dropck]. This change is a major reduction in unsafe
8300 * The `thread_local` module [has been renamed to `std::thread`][th].
8301 * The methods of `IteratorExt` [have been moved to the `Iterator`
8303 * Several traits that implement Rust's conventions for type
8304 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8305 [centralized in the `std::convert` module][con].
8306 * The `FromError` trait [was removed in favor of `From`][fe].
8307 * The basic sleep function [has moved to
8308 `std::thread::sleep_ms`][slp].
8309 * The `splitn` function now takes an `n` parameter that represents the
8310 number of items yielded by the returned iterator [instead of the
8311 number of 'splits'][spl].
8312 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8313 * [Derived implementations of `PartialOrd` now order enums according
8314 to their explicitly-assigned discriminants][po].
8315 * [Methods for searching strings are generic over `Pattern`s][pat],
8316 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8318 * [In method resolution, object methods are resolved before inherent
8320 * [`String::from_str` has been deprecated in favor of the `From` impl,
8321 `String::from`][sf].
8322 * [`io::Error` implements `Sync`][ios].
8323 * [The `words` method on `&str` has been replaced with
8324 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8326 * The new path and IO modules are complete and `#[stable]`. This
8327 was the major library focus for this cycle.
8328 * The path API was [revised][path-normalize] to normalize `.`,
8329 adjusting the tradeoffs in favor of the most common usage.
8330 * A large number of remaining APIs in `std` were also stabilized
8331 during this cycle; about 75% of the non-deprecated API surface
8333 * The new [string pattern API][string-pattern] landed, which makes
8334 the string slice API much more internally consistent and flexible.
8335 * A new set of [generic conversion traits][conversion] replaced
8336 many existing ad hoc traits.
8337 * Generic numeric traits were [completely removed][num-traits]. This
8338 was made possible thanks to inherent methods for primitive types,
8339 and the removal gives maximal flexibility for designing a numeric
8340 hierarchy in the future.
8341 * The `Fn` traits are now related via [inheritance][fn-inherit]
8342 and provide ergonomic [blanket implementations][fn-blanket].
8343 * The `Index` and `IndexMut` traits were changed to
8344 [take the index by value][index-value], enabling code like
8345 `hash_map["string"]` to work.
8346 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8347 `Copy` data is known to be `Clone` as well.
8352 * Many errors now have extended explanations that can be accessed with
8353 the `--explain` flag to `rustc`.
8354 * Many new examples have been added to the standard library
8356 * rustdoc has received a number of improvements focused on completion
8358 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8359 * Much headway was made on ecosystem-wide CI, making it possible
8360 to [compare builds for breakage][ci-compare].
8363 [crates.io]: http://crates.io
8364 [clo]: https://github.com/rust-lang/rust/pull/24034
8365 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8366 [con]: https://github.com/rust-lang/rust/pull/23875
8367 [cr]: https://github.com/rust-lang/rust/pull/23419
8368 [fe]: https://github.com/rust-lang/rust/pull/23879
8369 [ie]: https://github.com/rust-lang/rust/pull/23300
8370 [inv]: https://github.com/rust-lang/rust/pull/23938
8371 [ios]: https://github.com/rust-lang/rust/pull/24133
8372 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8373 [lt]: https://github.com/rust-lang/rust/pull/24057
8374 [meth]: https://github.com/rust-lang/rust/pull/24056
8375 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8376 [po]: https://github.com/rust-lang/rust/pull/24270
8377 [sf]: https://github.com/rust-lang/rust/pull/24517
8378 [slp]: https://github.com/rust-lang/rust/pull/23949
8379 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8380 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8381 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8382 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8383 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8384 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8385 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8386 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8387 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8388 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8389 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8390 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8391 [reflect]: https://github.com/rust-lang/rust/pull/23712
8392 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8393 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8394 [index-value]: https://github.com/rust-lang/rust/pull/23601
8395 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8396 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8397 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8398 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8399 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8400 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8403 Version 1.0.0-alpha.2 (2015-02-20)
8404 =====================================
8406 * ~1300 changes, numerous bugfixes
8410 * The various I/O modules were [overhauled][io-rfc] to reduce
8411 unnecessary abstractions and provide better interoperation with
8412 the underlying platform. The old `io` module remains temporarily
8414 * The standard library now [participates in feature gating][feat],
8415 so use of unstable libraries now requires a `#![feature(...)]`
8416 attribute. The impact of this change is [described on the
8417 forum][feat-forum]. [RFC][feat-rfc].
8421 * `for` loops [now operate on the `IntoIterator` trait][into],
8422 which eliminates the need to call `.iter()`, etc. to iterate
8423 over collections. There are some new subtleties to remember
8424 though regarding what sort of iterators various types yield, in
8425 particular that `for foo in bar { }` yields values from a move
8426 iterator, destroying the original collection. [RFC][into-rfc].
8427 * Objects now have [default lifetime bounds][obj], so you don't
8428 have to write `Box<Trait+'static>` when you don't care about
8429 storing references. [RFC][obj-rfc].
8430 * In types that implement `Drop`, [lifetimes must outlive the
8431 value][drop]. This will soon make it possible to safely
8432 implement `Drop` for types where `#[unsafe_destructor]` is now
8433 required. Read the [gorgeous RFC][drop-rfc] for details.
8434 * The fully qualified <T as Trait>::X syntax lets you set the Self
8435 type for a trait method or associated type. [RFC][ufcs-rfc].
8436 * References to types that implement `Deref<U>` now [automatically
8437 coerce to references][deref] to the dereferenced type `U`,
8438 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8439 should eliminate many unsightly uses of `&*`, as when converting
8440 from references to vectors into references to
8441 slices. [RFC][deref-rfc].
8442 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8443 `|:|`) is obsolete and closure kind is inferred from context.
8444 * [`Self` is a keyword][Self].
8448 * The `Show` and `String` formatting traits [have been
8449 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8450 their related purposes. Automatically getting a string
8451 conversion to use with `format!("{:?}", something_to_debug)` is
8452 now written `#[derive(Debug)]`.
8453 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8454 OsStr}`, provide strings in platform-specific encodings for easier
8455 interop with system APIs. [RFC][osstr-rfc].
8456 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8457 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8458 creating raw pointers.
8462 * Certain long error messages of the form 'expected foo found bar'
8463 are now [split neatly across multiple
8464 lines][multiline]. Examples in the PR.
8465 * On Unix Rust can be [uninstalled][un] by running
8466 `/usr/local/lib/rustlib/uninstall.sh`.
8467 * The `#[rustc_on_unimplemented]` attribute, requiring the
8468 'on_unimplemented' feature, lets rustc [display custom error
8469 messages when a trait is expected to be implemented for a type
8474 * Rust is tested against a [LALR grammar][lalr], which parses
8475 almost all the Rust files that rustc does.
8477 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8478 [close]: https://github.com/rust-lang/rust/pull/21843
8479 [deref]: https://github.com/rust-lang/rust/pull/21351
8480 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8481 [drop]: https://github.com/rust-lang/rust/pull/21972
8482 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8483 [feat]: https://github.com/rust-lang/rust/pull/21248
8484 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8485 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8486 [fmt]: https://github.com/rust-lang/rust/pull/21457
8487 [into]: https://github.com/rust-lang/rust/pull/20790
8488 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8489 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8490 [lalr]: https://github.com/rust-lang/rust/pull/21452
8491 [multiline]: https://github.com/rust-lang/rust/pull/19870
8492 [obj]: https://github.com/rust-lang/rust/pull/22230
8493 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8494 [onun]: https://github.com/rust-lang/rust/pull/20889
8495 [osstr]: https://github.com/rust-lang/rust/pull/21488
8496 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8497 [Self]: https://github.com/rust-lang/rust/pull/22158
8498 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8499 [un]: https://github.com/rust-lang/rust/pull/22256
8502 Version 1.0.0-alpha (2015-01-09)
8503 ==================================
8505 * ~2400 changes, numerous bugfixes
8509 * The language itself is considered feature complete for 1.0,
8510 though there will be many usability improvements and bugfixes
8511 before the final release.
8512 * Nearly 50% of the public API surface of the standard library has
8513 been declared 'stable'. Those interfaces are unlikely to change
8515 * The long-running debate over integer types has been
8516 [settled][ints]: Rust will ship with types named `isize` and
8517 `usize`, rather than `int` and `uint`, for pointer-sized
8518 integers. Guidelines will be rolled out during the alpha cycle.
8519 * Most crates that are not `std` have been moved out of the Rust
8520 distribution into the Cargo ecosystem so they can evolve
8521 separately and don't need to be stabilized as quickly, including
8522 'time', 'getopts', 'num', 'regex', and 'term'.
8523 * Documentation continues to be expanded with more API coverage, more
8524 examples, and more in-depth explanations. The guides have been
8525 consolidated into [The Rust Programming Language][trpl].
8526 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8527 * All official Rust binary installers now come with [Cargo], the
8528 Rust package manager.
8532 * Closures have been [completely redesigned][unboxed] to be
8533 implemented in terms of traits, can now be used as generic type
8534 bounds and thus monomorphized and inlined, or via an opaque
8535 pointer (boxed) as in the old system. The new system is often
8536 referred to as 'unboxed' closures.
8537 * Traits now support [associated types][assoc], allowing families
8538 of related types to be defined together and used generically in
8540 * Enum variants are [namespaced by their type names][enum].
8541 * [`where` clauses][where] provide a more versatile and attractive
8542 syntax for specifying generic bounds, though the previous syntax
8544 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8546 * Rust [no longer has a runtime][rt] of any description, and only
8547 supports OS threads, not green threads.
8548 * At long last, Rust has been overhauled for 'dynamically-sized
8549 types' ([DST]), which integrates 'fat pointers' (object types,
8550 arrays, and `str`) more deeply into the type system, making it
8552 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8553 `..j` that produce range types and which, when combined with the
8554 `Index` operator and multidispatch, leads to a convenient slice
8556 * The new range syntax revealed an ambiguity in the fixed-length
8557 array syntax, so now fixed length arrays [are written `[T;
8559 * The `Copy` trait is no longer implemented automatically. Unsafe
8560 pointers no longer implement `Sync` and `Send` so types
8561 containing them don't automatically either. `Sync` and `Send`
8562 are now 'unsafe traits' so one can "forcibly" implement them via
8563 `unsafe impl` if a type confirms to the requirements for them
8564 even though the internals do not (e.g. structs containing unsafe
8565 pointers like `Arc`). These changes are intended to prevent some
8566 footguns and are collectively known as [opt-in built-in
8567 traits][oibit] (though `Sync` and `Send` will soon become pure
8568 library types unknown to the compiler).
8569 * Operator traits now take their operands [by value][ops], and
8570 comparison traits can use multidispatch to compare one type
8571 against multiple other types, allowing e.g. `String` to be
8572 compared with `&str`.
8573 * `if let` and `while let` are no longer feature-gated.
8574 * Rust has adopted a more [uniform syntax for escaping unicode
8575 characters][unicode].
8576 * `macro_rules!` [has been declared stable][mac]. Though it is a
8577 flawed system it is sufficiently popular that it must be usable
8578 for 1.0. Effort has gone into [future-proofing][mac-future] it
8579 in ways that will allow other macro systems to be developed in
8580 parallel, and won't otherwise impact the evolution of the
8582 * The prelude has been [pared back significantly][prelude] such
8583 that it is the minimum necessary to support the most pervasive
8584 code patterns, and through [generalized where clauses][where]
8585 many of the prelude extension traits have been consolidated.
8586 * Rust's rudimentary reflection [has been removed][refl], as it
8587 incurred too much code generation for little benefit.
8588 * [Struct variants][structvars] are no longer feature-gated.
8589 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8590 known as 'higher-ranked trait bounds', this crucially allows
8591 unboxed closures to work.
8592 * Macros invocations surrounded by parens or square brackets and
8593 not terminated by a semicolon are [parsed as
8594 expressions][macros], which makes expressions like `vec![1i32,
8595 2, 3].len()` work as expected.
8596 * Trait objects now implement their traits automatically, and
8597 traits that can be coerced to objects now must be [object
8599 * Automatically deriving traits is now done with `#[derive(...)]`
8600 not `#[deriving(...)]` for [consistency with other naming
8601 conventions][derive].
8602 * Importing the containing module or enum at the same time as
8603 items or variants they contain is [now done with `self` instead
8604 of `mod`][self], as in use `foo::{self, bar}`
8605 * Glob imports are no longer feature-gated.
8606 * The `box` operator and `box` patterns have been feature-gated
8607 pending a redesign. For now unique boxes should be allocated
8608 like other containers, with `Box::new`.
8612 * A [series][coll1] of [efforts][coll2] to establish
8613 [conventions][coll3] for collections types has resulted in API
8614 improvements throughout the standard library.
8615 * New [APIs for error handling][err] provide ergonomic interop
8616 between error types, and [new conventions][err-conv] describe
8617 more clearly the recommended error handling strategies in Rust.
8618 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8619 it is easier to discuss failure in the context of error handling
8620 without making clarifications as to whether you are referring to
8621 the 'fail' macro or failure more generally.
8622 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8623 syscall when available.
8624 * The 'serialize' crate has been renamed 'rustc-serialize' and
8625 moved out of the distribution to Cargo. Although it is widely
8626 used now, it is expected to be superseded in the near future.
8627 * The `Show` formatter, typically implemented with
8628 `#[derive(Show)]` is [now requested with the `{:?}`
8629 specifier][show] and is intended for use by all types, for uses
8630 such as `println!` debugging. The new `String` formatter must be
8631 implemented by hand, uses the `{}` specifier, and is intended
8632 for full-fidelity conversions of things that can logically be
8633 represented as strings.
8637 * [Flexible target specification][flex] allows rustc's code
8638 generation to be configured to support otherwise-unsupported
8640 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8641 respective debuggers with Rust-appropriate pretty-printing.
8642 * The Windows installation of Rust is distributed with the
8643 MinGW components currently required to link binaries on that
8648 * Nullable enum optimizations have been extended to more types so
8649 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8650 space than the inner types themselves.
8651 * Work has begun on supporting AArch64.
8653 [Cargo]: https://crates.io
8654 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8655 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8656 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8657 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8658 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8659 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8660 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8661 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8662 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8663 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8664 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8665 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8666 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8667 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8668 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8669 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8670 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8671 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8672 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8673 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8674 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8675 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8676 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8677 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8678 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8679 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8680 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8681 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8682 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8683 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8684 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8685 [trpl]: https://doc.rust-lang.org/book/index.html
8686 [rbe]: http://rustbyexample.com/
8689 Version 0.12.0 (2014-10-09)
8690 =============================
8692 * ~1900 changes, numerous bugfixes
8696 * The introductory documentation (now called The Rust Guide) has
8697 been completely rewritten, as have a number of supplementary
8699 * Rust's package manager, Cargo, continues to improve and is
8700 sometimes considered to be quite awesome.
8701 * Many API's in `std` have been reviewed and updated for
8702 consistency with the in-development Rust coding
8703 guidelines. The standard library documentation tracks
8704 stabilization progress.
8705 * Minor libraries have been moved out-of-tree to the rust-lang org
8706 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8707 be installed with Cargo.
8708 * Lifetime elision allows lifetime annotations to be left off of
8709 function declarations in many common scenarios.
8710 * Rust now works on 64-bit Windows.
8713 * Indexing can be overloaded with the `Index` and `IndexMut`
8715 * The `if let` construct takes a branch only if the `let` pattern
8716 matches, currently behind the 'if_let' feature gate.
8717 * 'where clauses', a more flexible syntax for specifying trait
8718 bounds that is more aesthetic, have been added for traits and
8719 free functions. Where clauses will in the future make it
8720 possible to constrain associated types, which would be
8721 impossible with the existing syntax.
8722 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8723 the 'slicing_syntax' feature gate, and can be overloaded with
8724 the `Slice` or `SliceMut` traits.
8725 * The syntax for matching of sub-slices has been changed to use a
8726 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8727 consistency with other uses of `..` and to future-proof
8728 potential additional uses of the syntax.
8729 * The syntax for matching inclusive ranges in patterns has changed
8730 from `0..3` to `0...4` to be consistent with the exclusive range
8732 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8733 c]`) has been put behind the 'advanced_slice_patterns' feature
8734 gate and may be removed in the future.
8735 * Components of tuples and tuple structs can be extracted using
8736 the `value.0` syntax, currently behind the `tuple_indexing`
8738 * The `#[crate_id]` attribute is no longer supported; versioning
8739 is handled by the package manager.
8740 * Renaming crate imports are now written `extern crate foo as bar`
8741 instead of `extern crate bar = foo`.
8742 * Renaming use statements are now written `use foo as bar` instead
8744 * `let` and `match` bindings and argument names in macros are now
8746 * The new, more efficient, closure types ('unboxed closures') have
8747 been added under a feature gate, 'unboxed_closures'. These will
8748 soon replace the existing closure types, once higher-ranked
8749 trait lifetimes are added to the language.
8750 * `move` has been added as a keyword, for indicating closures
8751 that capture by value.
8752 * Mutation and assignment is no longer allowed in pattern guards.
8753 * Generic structs and enums can now have trait bounds.
8754 * The `Share` trait is now called `Sync` to free up the term
8755 'shared' to refer to 'shared reference' (the default reference
8757 * Dynamically-sized types have been mostly implemented,
8758 unifying the behavior of fat-pointer types with the rest of the
8760 * As part of dynamically-sized types, the `Sized` trait has been
8761 introduced, which qualifying types implement by default, and
8762 which type parameters expect by default. To specify that a type
8763 parameter does not need to be sized, write `<Sized? T>`. Most
8764 types are `Sized`, notable exceptions being unsized arrays
8765 (`[T]`) and trait types.
8766 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8767 * Lifetime bounds can now be applied to type parameters and object
8769 * The old, reference counted GC type, `Gc<T>` which was once
8770 denoted by the `@` sigil, has finally been removed. GC will be
8771 revisited in the future.
8774 * Library documentation has been improved for a number of modules.
8775 * Bit-vectors, collections::bitv has been modernized.
8776 * The url crate is deprecated in favor of
8777 http://github.com/servo/rust-url, which can be installed with
8779 * Most I/O stream types can be cloned and subsequently closed from
8781 * A `std::time::Duration` type has been added for use in I/O
8782 methods that rely on timers, as well as in the 'time' crate's
8783 `Timespec` arithmetic.
8784 * The runtime I/O abstraction layer that enabled the green thread
8785 scheduler to do non-thread-blocking I/O has been removed, along
8786 with the libuv-based implementation employed by the green thread
8787 scheduler. This will greatly simplify the future I/O work.
8788 * `collections::btree` has been rewritten to have a more
8789 idiomatic and efficient design.
8792 * rustdoc output now indicates the stability levels of API's.
8793 * The `--crate-name` flag can specify the name of the crate
8794 being compiled, like `#[crate_name]`.
8795 * The `-C metadata` specifies additional metadata to hash into
8796 symbol names, and `-C extra-filename` specifies additional
8797 information to put into the output filename, for use by the
8798 package manager for versioning.
8799 * debug info generation has continued to improve and should be
8800 more reliable under both gdb and lldb.
8801 * rustc has experimental support for compiling in parallel
8802 using the `-C codegen-units` flag.
8803 * rustc no longer encodes rpath information into binaries by
8807 * Stack usage has been optimized with LLVM lifetime annotations.
8808 * Official Rust binaries on Linux are more compatible with older
8809 kernels and distributions, built on CentOS 5.10.
8812 Version 0.11.0 (2014-07-02)
8813 ==========================
8815 * ~1700 changes, numerous bugfixes
8818 * ~[T] has been removed from the language. This type is superseded by
8820 * ~str has been removed from the language. This type is superseded by
8822 * ~T has been removed from the language. This type is superseded by the
8824 * @T has been removed from the language. This type is superseded by the
8825 standard library's std::gc::Gc<T> type.
8826 * Struct fields are now all private by default.
8827 * Vector indices and shift amounts are both required to be a `uint`
8828 instead of any integral type.
8829 * Byte character, byte string, and raw byte string literals are now all
8830 supported by prefixing the normal literal with a `b`.
8831 * Multiple ABIs are no longer allowed in an ABI string
8832 * The syntax for lifetimes on closures/procedures has been tweaked
8833 slightly: `<'a>|A, B|: 'b + K -> T`
8834 * Floating point modulus has been removed from the language; however it
8835 is still provided by a library implementation.
8836 * Private enum variants are now disallowed.
8837 * The `priv` keyword has been removed from the language.
8838 * A closure can no longer be invoked through a &-pointer.
8839 * The `use foo, bar, baz;` syntax has been removed from the language.
8840 * The transmute intrinsic no longer works on type parameters.
8841 * Statics now allow blocks/items in their definition.
8842 * Trait bounds are separated from objects with + instead of : now.
8843 * Objects can no longer be read while they are mutably borrowed.
8844 * The address of a static is now marked as insignificant unless the
8845 #[inline(never)] attribute is placed it.
8846 * The #[unsafe_destructor] attribute is now behind a feature gate.
8847 * Struct literals are no longer allowed in ambiguous positions such as
8848 if, while, match, and for..in.
8849 * Declaration of lang items and intrinsics are now feature-gated by
8851 * Integral literals no longer default to `int`, and floating point
8852 literals no longer default to `f64`. Literals must be suffixed with an
8853 appropriate type if inference cannot determine the type of the
8855 * The Box<T> type is no longer implicitly borrowed to &mut T.
8856 * Procedures are now required to not capture borrowed references.
8859 * The standard library is now a "facade" over a number of underlying
8860 libraries. This means that development on the standard library should
8861 be speedier due to smaller crates, as well as a clearer line between
8863 * A new library, libcore, lives under the standard library's facade
8864 which is Rust's "0-assumption" library, suitable for embedded and
8865 kernel development for example.
8866 * A regex crate has been added to the standard distribution. This crate
8867 includes statically compiled regular expressions.
8868 * The unwrap/unwrap_err methods on Result require a Show bound for
8869 better error messages.
8870 * The return types of the std::comm primitives have been centralized
8871 around the Result type.
8872 * A number of I/O primitives have gained the ability to time out their
8874 * A number of I/O primitives have gained the ability to close their
8875 reading/writing halves to cancel pending operations.
8876 * Reverse iterator methods have been removed in favor of `rev()` on
8877 their forward-iteration counterparts.
8878 * A bitflags! macro has been added to enable easy interop with C and
8879 management of bit flags.
8880 * A debug_assert! macro is now provided which is disabled when
8881 `--cfg ndebug` is passed to the compiler.
8882 * A graphviz crate has been added for creating .dot files.
8883 * The std::cast module has been migrated into std::mem.
8884 * The std::local_data api has been migrated from freestanding functions
8885 to being based on methods.
8886 * The Pod trait has been renamed to Copy.
8887 * jemalloc has been added as the default allocator for types.
8888 * The API for allocating memory has been changed to use proper alignment
8889 and sized deallocation
8890 * Connecting a TcpStream or binding a TcpListener is now based on a
8891 string address and a u16 port. This allows connecting to a hostname as
8893 * The Reader trait now contains a core method, read_at_least(), which
8894 correctly handles many repeated 0-length reads.
8895 * The process-spawning API is now centered around a builder-style
8897 * The :? printing qualifier has been moved from the standard library to
8898 an external libdebug crate.
8899 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8900 have been renamed to Eq/Ord.
8901 * The select/plural methods have been removed from format!. The escapes
8902 for { and } have also changed from \{ and \} to {{ and }},
8904 * The TaskBuilder API has been re-worked to be a true builder, and
8905 extension traits for spawning native/green tasks have been added.
8908 * All breaking changes to the language or libraries now have their
8909 commit message annotated with `[breaking-change]` to allow for easy
8910 discovery of breaking changes.
8911 * The compiler will now try to suggest how to annotate lifetimes if a
8912 lifetime-related error occurs.
8913 * Debug info continues to be improved greatly with general bug fixes and
8914 better support for situations like link time optimization (LTO).
8915 * Usage of syntax extensions when cross-compiling has been fixed.
8916 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8917 -fdata-sections and --gc-sections has been enabled by default
8918 * The compiler is now stricter about where it will load module files
8919 from when a module is declared via `mod foo;`.
8920 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8921 Syntax extensions are now discovered via a "plugin registrar" type
8922 which will be extended in the future to other various plugins.
8923 * Lints have been restructured to allow for dynamically loadable lints.
8924 * A number of rustdoc improvements:
8925 * The HTML output has been visually redesigned.
8926 * Markdown is now powered by hoedown instead of sundown.
8927 * Searching heuristics have been greatly improved.
8928 * The search index has been reduced in size by a great amount.
8929 * Cross-crate documentation via `pub use` has been greatly improved.
8930 * Primitive types are now hyperlinked and documented.
8931 * Documentation has been moved from static.rust-lang.org/doc to
8933 * A new sandbox, play.rust-lang.org, is available for running and
8934 sharing rust code examples on-line.
8935 * Unused attributes are now more robustly warned about.
8936 * The dead_code lint now warns about unused struct fields.
8937 * Cross-compiling to iOS is now supported.
8938 * Cross-compiling to mipsel is now supported.
8939 * Stability attributes are now inherited by default and no longer apply
8940 to intra-crate usage, only inter-crate usage.
8941 * Error message related to non-exhaustive match expressions have been
8945 Version 0.10 (2014-04-03)
8946 =========================
8948 * ~1500 changes, numerous bugfixes
8951 * A new RFC process is now in place for modifying the language.
8952 * Patterns with `@`-pointers have been removed from the language.
8953 * Patterns with unique vectors (`~[T]`) have been removed from the
8955 * Patterns with unique strings (`~str`) have been removed from the
8957 * `@str` has been removed from the language.
8958 * `@[T]` has been removed from the language.
8959 * `@self` has been removed from the language.
8960 * `@Trait` has been removed from the language.
8961 * Headers on `~` allocations which contain `@` boxes inside the type for
8962 reference counting have been removed.
8963 * The semantics around the lifetimes of temporary expressions have changed,
8964 see #3511 and #11585 for more information.
8965 * Cross-crate syntax extensions are now possible, but feature gated. See
8966 #11151 for more information. This includes both `macro_rules!` macros as
8967 well as syntax extensions such as `format!`.
8968 * New lint modes have been added, and older ones have been turned on to be
8970 * Unnecessary parentheses
8973 * Uppercase variables
8974 * Publicly visible private types
8975 * `#[deriving]` with raw pointers
8976 * Unsafe functions can no longer be coerced to closures.
8977 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8978 * The `#[simd]` attribute is now behind a feature gate.
8979 * Visibility is no longer allowed on `extern crate` statements, and
8980 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8981 * Trailing commas are now allowed in argument lists and tuple patterns.
8982 * The `do` keyword has been removed, it is now a reserved keyword.
8983 * Default type parameters have been implemented, but are feature gated.
8984 * Borrowed variables through captures in closures are now considered soundly.
8985 * `extern mod` is now `extern crate`
8986 * The `Freeze` trait has been removed.
8987 * The `Share` trait has been added for types that can be shared among
8989 * Labels in macros are now hygienic.
8990 * Expression/statement macro invocations can be delimited with `{}` now.
8991 * Treatment of types allowed in `static mut` locations has been tweaked.
8992 * The `*` and `.` operators are now overloadable through the `Deref` and
8994 * `~Trait` and `proc` no longer have `Send` bounds by default.
8995 * Partial type hints are now supported with the `_` type marker.
8996 * An `Unsafe` type was introduced for interior mutability. It is now
8997 considered undefined to transmute from `&T` to `&mut T` without using the
8999 * The #[linkage] attribute was implemented for extern statics/functions.
9000 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9001 * `Pod` was renamed to `Copy`.
9004 * The `libextra` library has been removed. It has now been decomposed into
9005 component libraries with smaller and more focused nuggets of
9006 functionality. The full list of libraries can be found on the
9007 documentation index page.
9008 * std: `std::condition` has been removed. All I/O errors are now propagated
9009 through the `Result` type. In order to assist with error handling, a
9010 `try!` macro for unwrapping errors with an early return and a lint for
9011 unused results has been added. See #12039 for more information.
9012 * std: The `vec` module has been renamed to `slice`.
9013 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9014 This will become the only growable vector in the future.
9015 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9016 are now found at `std::io::BufferedReader` instead of
9017 `std::io::buffered::BufferedReader`.
9018 * std: `print` and `println` are no longer in the prelude, the `print!` and
9019 `println!` macros are intended to be used instead.
9020 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9021 attempts to statically prevent cycles.
9022 * std: The standard distribution is adopting the policy of pushing failure
9023 to the user rather than failing in libraries. Many functions (such as
9024 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9025 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9026 deriving mode: `#[deriving(Show)]`.
9027 * std: `ToStr` is now implemented for all types implementing `Show`.
9028 * std: The formatting trait methods now take `&self` instead of `&T`
9029 * std: The `invert()` method on iterators has been renamed to `rev()`
9030 * std: `std::num` has seen a reduction in the genericity of its traits,
9031 consolidating functionality into a few core traits.
9032 * std: Backtraces are now printed on task failure if the environment
9033 variable `RUST_BACKTRACE` is present.
9034 * std: Naming conventions for iterators have been standardized. More details
9035 can be found on the wiki's style guide.
9036 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9037 still implement the function.
9038 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9039 * std: `assert_approx_eq!` has been removed
9040 * std: The `e` and `E` formatting specifiers for floats have been added to
9041 print them in exponential notation.
9042 * std: The `Times` trait has been removed
9043 * std: Indications of variance and opting out of builtin bounds is done
9044 through marker types in `std::kinds::marker` now
9045 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9046 `#[deriving(Hash)]` is now possible.
9047 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9048 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9049 * std: `Chan::new` is now `channel()`.
9050 * std: A new synchronous channel type has been implemented.
9051 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9052 * std: `hashmap` and `trie` have been moved to `libcollections`
9053 * std: `run` has been rolled into `io::process`
9054 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9055 * std: The equality and comparison traits have seen some reorganization.
9056 * std: `rand` has moved to `librand`.
9057 * std: `to_{lower,upper}case` has been implemented for `char`.
9058 * std: Logging has been moved to `liblog`.
9059 * collections: `HashMap` has been rewritten for higher performance and less
9061 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9062 it can be booted manually. The runtime guide has more information and
9064 * native: All I/O functionality except signals has been implemented.
9065 * green: Task spawning with `libgreen` has been optimized with stack caching
9066 and various trimming of code.
9067 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9068 * sync: The `extra::sync` module has been updated to modern rust (and moved
9069 to the `sync` library), tweaking and improving various interfaces while
9070 dropping redundant functionality.
9071 * sync: A new `Barrier` type has been added to the `sync` library.
9072 * sync: An efficient mutex for native and green tasks has been implemented.
9073 * serialize: The `base64` module has seen some improvement. It treats
9074 newlines better, has non-string error values, and has seen general
9076 * fourcc: A `fourcc!` macro was introduced
9077 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9078 hexadecimal literal.
9081 * `rustpkg` has been deprecated and removed from the main repository. Its
9082 replacement, `cargo`, is under development.
9083 * Nightly builds of rust are now available
9084 * The memory usage of rustc has been improved many times throughout this
9086 * The build process supports disabling rpath support for the rustc binary
9088 * Code generation has improved in some cases, giving more information to the
9089 LLVM optimization passes to enable more extensive optimizations.
9090 * Debuginfo compatibility with lldb on OSX has been restored.
9091 * The master branch is now gated on an android bot, making building for
9092 android much more reliable.
9093 * Output flags have been centralized into one `--emit` flag.
9094 * Crate type flags have been centralized into one `--crate-type` flag.
9095 * Codegen flags have been consolidated behind a `-C` flag.
9096 * Linking against outdated crates now has improved error messages.
9097 * Error messages with lifetimes will often suggest how to annotate the
9098 function to fix the error.
9099 * Many more types are documented in the standard library, and new guides
9101 * Many `rustdoc` improvements:
9102 * code blocks are syntax highlighted.
9103 * render standalone markdown files.
9104 * the --test flag tests all code blocks by default.
9105 * exported macros are displayed.
9106 * re-exported types have their documentation inlined at the location of the
9108 * search works across crates that have been rendered to the same output
9112 Version 0.9 (2014-01-09)
9113 ==========================
9115 * ~1800 changes, numerous bugfixes
9118 * The `float` type has been removed. Use `f32` or `f64` instead.
9119 * A new facility for enabling experimental features (feature gating) has
9120 been added, using the crate-level `#[feature(foo)]` attribute.
9121 * Managed boxes (@) are now behind a feature gate
9122 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9123 standard library's `Gc` or `Rc` types instead.
9124 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9125 * Jumping back to the top of a loop is now done with `continue` instead of
9127 * Strings can no longer be mutated through index assignment.
9128 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9129 hash delimiters, as in `r###"foo"###`.
9130 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9132 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9133 * `@fn`s have been removed.
9134 * `do` only works with procs in order to make it obvious what the cost
9136 * Single-element tuple-like structs can no longer be dereferenced to
9137 obtain the inner value. A more comprehensive solution for overloading
9138 the dereference operator will be provided in the future.
9139 * The `#[link(...)]` attribute has been replaced with
9140 `#[crate_id = "name#vers"]`.
9141 * Empty `impl`s must be terminated with empty braces and may not be
9142 terminated with a semicolon.
9143 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9144 no longer has any special meaning.
9145 * The old `fmt!` string formatting macro has been removed.
9146 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9147 `print!` and `println!`.
9148 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9149 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9150 `extern mod foo = "bar"` instead.
9151 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9152 * Macros can have attributes.
9153 * Macros can expand to items with attributes.
9154 * Macros can expand to multiple items.
9155 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9156 * Comments may be nested.
9157 * Values automatically coerce to trait objects they implement, without
9159 * Enum discriminants are no longer an entire word but as small as needed to
9160 contain all the variants. The `repr` attribute can be used to override
9161 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9162 `#[repr(C)]` to match C enums.
9163 * Non-string literals are not allowed in attributes (they never worked).
9164 * The FFI now supports variadic functions.
9165 * Octal numeric literals, as in `0o7777`.
9166 * The `concat!` syntax extension performs compile-time string concatenation.
9167 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9168 removed as Rust no longer uses segmented stacks.
9169 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9170 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9171 not `*`; ignoring remaining fields of a struct is also done with `..`,
9172 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9173 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9174 * `rustc` supports the "system" calling convention, which defaults to the
9175 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9177 * The `type_overflow` lint (default: warn) checks literals for overflow.
9178 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9179 * The `attribute_usage` lint (default: warn) warns about unknown
9181 * The `unknown_features` lint (default: warn) warns about unknown
9183 * The `dead_code` lint (default: warn) checks for dead code.
9184 * Rust libraries can be linked statically to one another
9185 * `#[link_args]` is behind the `link_args` feature gate.
9186 * Native libraries are now linked with `#[link(name = "foo")]`
9187 * Native libraries can be statically linked to a rust crate
9188 (`#[link(name = "foo", kind = "static")]`).
9189 * Native OS X frameworks are now officially supported
9190 (`#[link(name = "foo", kind = "framework")]`).
9191 * The `#[thread_local]` attribute creates thread-local (not task-local)
9192 variables. Currently behind the `thread_local` feature gate.
9193 * The `return` keyword may be used in closures.
9194 * Types that can be copied via a memcpy implement the `Pod` kind.
9195 * The `cfg` attribute can now be used on struct fields and enum variants.
9198 * std: The `option` and `result` API's have been overhauled to make them
9199 simpler, more consistent, and more composable.
9200 * std: The entire `std::io` module has been replaced with one that is
9201 more comprehensive and that properly interfaces with the underlying
9202 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9204 * std: `io::util` contains a number of useful implementations of
9205 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9206 `ZeroReader`, `TeeReader`.
9207 * std: The reference counted pointer type `extra::rc` moved into std.
9208 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9209 just a wrapper around it).
9210 * std: The `Either` type has been removed.
9211 * std: `fmt::Default` can be implemented for any type to provide default
9212 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9213 * std: The `rand` API continues to be tweaked.
9214 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9215 on failure in gdb, is now named `rust_fail`.
9216 * std: The `each_key` and `each_value` methods on `HashMap` have been
9217 replaced by the `keys` and `values` iterators.
9218 * std: Functions dealing with type size and alignment have moved from the
9219 `sys` module to the `mem` module.
9220 * std: The `path` module was written and API changed.
9221 * std: `str::from_utf8` has been changed to cast instead of allocate.
9222 * std: `starts_with` and `ends_with` methods added to vectors via the
9223 `ImmutableEqVector` trait, which is in the prelude.
9224 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9225 if the index is out of bounds.
9226 * std: Task failure no longer propagates between tasks, as the model was
9227 complex, expensive, and incompatible with thread-based tasks.
9228 * std: The `Any` type can be used for dynamic typing.
9229 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9231 * std: Methods that produce iterators generally do not have an `_iter`
9233 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9234 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9235 * std: `util::ignore` renamed to `prelude::drop`.
9236 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9238 * std: `vec::raw` has seen a lot of cleanup and API changes.
9239 * std: The standard library no longer includes any C++ code, and very
9240 minimal C, eliminating the dependency on libstdc++.
9241 * std: Runtime scheduling and I/O functionality has been factored out into
9242 extensible interfaces and is now implemented by two different crates:
9243 libnative, for native threading and I/O; and libgreen, for green threading
9244 and I/O. This paves the way for using the standard library in more limited
9245 embedded environments.
9246 * std: The `comm` module has been rewritten to be much faster, have a
9247 simpler, more consistent API, and to work for both native and green
9249 * std: All libuv dependencies have been moved into the rustuv crate.
9250 * native: New implementations of runtime scheduling on top of OS threads.
9251 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9253 * green: The green thread scheduler and message passing types are almost
9255 * extra: The `flatpipes` module had bitrotted and was removed.
9256 * extra: All crypto functions have been removed and Rust now has a policy of
9257 not reimplementing crypto in the standard library. In the future crypto
9258 will be provided by external crates with bindings to established libraries.
9259 * extra: `c_vec` has been modernized.
9260 * extra: The `sort` module has been removed. Use the `sort` method on
9264 * The `rust` and `rusti` commands have been removed, due to lack of
9266 * `rustdoc` was completely rewritten.
9267 * `rustdoc` can test code examples in documentation.
9268 * `rustpkg` can test packages with the argument, 'test'.
9269 * `rustpkg` supports arbitrary dependencies, including C libraries.
9270 * `rustc`'s support for generating debug info is improved again.
9271 * `rustc` has better error reporting for unbalanced delimiters.
9272 * `rustc`'s JIT support was removed due to bitrot.
9273 * Executables and static libraries can be built with LTO (-Z lto)
9274 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9278 Version 0.8 (2013-09-26)
9279 ============================
9281 * ~2200 changes, numerous bugfixes
9284 * The `for` loop syntax has changed to work with the `Iterator` trait.
9285 * At long last, unwinding works on Windows.
9286 * Default methods are ready for use.
9287 * Many trait inheritance bugs fixed.
9288 * Owned and borrowed trait objects work more reliably.
9289 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9290 * rustc can omit emission of code for the `debug!` macro if it is passed
9292 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9293 for foo.rs, then foo/mod.rs, and will generate an error when both are
9295 * Strings no longer contain trailing nulls. The new `std::c_str` module
9296 provides new mechanisms for converting to C strings.
9297 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9298 * The FFI has been overhauled such that foreign functions are called directly,
9299 instead of through a stack-switching wrapper.
9300 * Calling a foreign function must be done through a Rust function with the
9301 `#[fixed_stack_segment]` attribute.
9302 * The `externfn!` macro can be used to declare both a foreign function and
9303 a `#[fixed_stack_segment]` wrapper at once.
9304 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9305 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9306 * `priv` is disallowed everywhere except for struct fields and enum variants.
9307 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9308 * `ref` bindings in irrefutable patterns work correctly now.
9309 * `char` is now prevented from containing invalid code points.
9310 * Casting to `bool` is no longer allowed.
9311 * `\0` is now accepted as an escape in chars and strings.
9312 * `yield` is a reserved keyword.
9313 * `typeof` is a reserved keyword.
9314 * Crates may be imported by URL with `extern mod foo = "url";`.
9315 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9316 * Static vectors can be initialized with repeating elements,
9317 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9318 * Static structs can be initialized with functional record update,
9319 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9320 * `cfg!` can be used to conditionally execute code based on the crate
9321 configuration, similarly to `#[cfg(...)]`.
9322 * The `unnecessary_qualification` lint detects unneeded module
9323 prefixes (default: allow).
9324 * Arithmetic operations have been implemented on the SIMD types in
9325 `std::unstable::simd`.
9326 * Exchange allocation headers were removed, reducing memory usage.
9327 * `format!` implements a completely new, extensible, and higher-performance
9328 string formatting system. It will replace `fmt!`.
9329 * `print!` and `println!` write formatted strings (using the `format!`
9330 extension) to stdout.
9331 * `write!` and `writeln!` write formatted strings (using the `format!`
9332 extension) to the new Writers in `std::rt::io`.
9333 * The library section in which a function or static is placed may
9334 be specified with `#[link_section = "..."]`.
9335 * The `proto!` syntax extension for defining bounded message protocols
9337 * `macro_rules!` is hygienic for `let` declarations.
9338 * The `#[export_name]` attribute specifies the name of a symbol.
9339 * `unreachable!` can be used to indicate unreachable code, and fails
9343 * std: Transitioned to the new runtime, written in Rust.
9344 * std: Added an experimental I/O library, `rt::io`, based on the new
9346 * std: A new generic `range` function was added to the prelude, replacing
9347 `uint::range` and friends.
9348 * std: `range_rev` no longer exists. Since range is an iterator it can be
9349 reversed with `range(lo, hi).invert()`.
9350 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9351 renamed to `unwrap_or`.
9352 * std: The `iterator` module was renamed to `iter`.
9353 * std: Integral types now support the `checked_add`, `checked_sub`, and
9354 `checked_mul` operations for detecting overflow.
9355 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9357 * std: Methods are standardizing on conventions for casting methods:
9358 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9360 * std: The `CString` type in `c_str` provides new ways to convert to and
9362 * std: `DoubleEndedIterator` can yield elements in two directions.
9363 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9365 * std: `str::from_bytes` renamed to `str::from_utf8`.
9366 * std: `pop_opt` and `shift_opt` methods added to vectors.
9367 * std: The task-local data interface no longer uses @, and keys are
9368 no longer function pointers.
9369 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9370 * std: Added `SharedPort` to `comm`.
9371 * std: `Eq` has a default method for `ne`; only `eq` is required
9373 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9374 is required in implementations.
9375 * std: `is_utf8` performance is improved, impacting many string functions.
9376 * std: `os::MemoryMap` provides cross-platform mmap.
9377 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9378 are not 'in-bounds' are considered undefined.
9379 * std: Many freestanding functions in `vec` removed in favor of methods.
9380 * std: Many freestanding functions on scalar types removed in favor of
9382 * std: Many options to task builders were removed since they don't make
9383 sense in the new scheduler design.
9384 * std: More containers implement `FromIterator` so can be created by the
9386 * std: More complete atomic types in `unstable::atomics`.
9387 * std: `comm::PortSet` removed.
9388 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9389 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9390 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9391 default implementations.
9392 * std: Various `from_str` functions were removed in favor of a generic
9393 `from_str` which is available in the prelude.
9394 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9395 * extra: `dlist`, the doubly-linked list was modernized.
9396 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9397 * extra: Added `glob` module, replacing `std::os::glob`.
9398 * extra: `rope` was removed.
9399 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9400 * extra: `net`, and `timer` were removed. The experimental replacements
9401 are `std::rt::io::net` and `std::rt::io::timer`.
9402 * extra: Iterators implemented for `SmallIntMap`.
9403 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9404 * extra: `SmallIntSet` removed. Use `BitvSet`.
9405 * extra: Performance of JSON parsing greatly improved.
9406 * extra: `semver` updated to SemVer 2.0.0.
9407 * extra: `term` handles more terminals correctly.
9408 * extra: `dbg` module removed.
9409 * extra: `par` module removed.
9410 * extra: `future` was cleaned up, with some method renames.
9411 * extra: Most free functions in `getopts` were converted to methods.
9414 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9415 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9416 similarly to gcc's `--march` flag.
9417 * rustc's performance compiling small crates is much better.
9418 * rustpkg has received many improvements.
9419 * rustpkg supports git tags as package IDs.
9420 * rustpkg builds into target-specific directories so it can be used for
9422 * The number of concurrent test tasks is controlled by the environment
9423 variable RUST_TEST_TASKS.
9424 * The test harness can now report metrics for benchmarks.
9425 * All tools have man pages.
9426 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9427 * The runtime uses jemalloc for allocations.
9428 * Segmented stacks are temporarily disabled as part of the transition to
9429 the new runtime. Stack overflows are possible!
9430 * A new documentation backend, rustdoc_ng, is available for use. It is
9431 still invoked through the normal `rustdoc` command.
9434 Version 0.7 (2013-07-03)
9435 =======================
9437 * ~2000 changes, numerous bugfixes
9440 * `impl`s no longer accept a visibility qualifier. Put them on methods
9442 * The borrow checker has been rewritten with flow-sensitivity, fixing
9443 many bugs and inconveniences.
9444 * The `self` parameter no longer implicitly means `&'self self`,
9445 and can be explicitly marked with a lifetime.
9446 * Overloadable compound operators (`+=`, etc.) have been temporarily
9447 removed due to bugs.
9448 * The `for` loop protocol now requires `for`-iterators to return `bool`
9449 so they compose better.
9450 * The `Durable` trait is replaced with the `'static` bounds.
9451 * Trait default methods work more often.
9452 * Structs with the `#[packed]` attribute have byte alignment and
9453 no padding between fields.
9454 * Type parameters bound by `Copy` must now be copied explicitly with
9456 * It is now illegal to move out of a dereferenced unsafe pointer.
9457 * `Option<~T>` is now represented as a nullable pointer.
9458 * `@mut` does dynamic borrow checks correctly.
9459 * The `main` function is only detected at the topmost level of the crate.
9460 The `#[main]` attribute is still valid anywhere.
9461 * Struct fields may no longer be mutable. Use inherited mutability.
9462 * The `#[no_send]` attribute makes a type that would otherwise be
9464 * The `#[no_freeze]` attribute makes a type that would otherwise be
9466 * Unbounded recursion will abort the process after reaching the limit
9467 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9468 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9469 are never implicitly copyable.
9470 * `#[static_assert]` makes compile-time assertions about static bools.
9471 * At long last, 'argument modes' no longer exist.
9472 * The rarely used `use mod` statement no longer exists.
9475 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9477 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9478 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9480 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9481 and unsuffixed integer literals.
9484 * The `core` crate was renamed to `std`.
9485 * The `std` crate was renamed to `extra`.
9486 * More and improved documentation.
9487 * std: `iterator` module for external iterator objects.
9488 * Many old-style (internal, higher-order function) iterators replaced by
9489 implementations of `Iterator`.
9490 * std: Many old internal vector and string iterators,
9491 incl. `any`, `all`. removed.
9492 * std: The `finalize` method of `Drop` renamed to `drop`.
9493 * std: The `drop` method now takes `&mut self` instead of `&self`.
9494 * std: The prelude no longer re-exports any modules, only types and traits.
9495 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9496 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9497 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9498 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9499 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9500 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9501 * std: Many types implement `Clone`.
9502 * std: `path` type renamed to `Path`.
9503 * std: `mut` module and `Mut` type removed.
9504 * std: Many standalone functions removed in favor of methods and iterators
9505 in `vec`, `str`. In the future methods will also work as functions.
9506 * std: `reinterpret_cast` removed. Use `transmute`.
9507 * std: ascii string handling in `std::ascii`.
9508 * std: `Rand` is implemented for ~/@.
9509 * std: `run` module for spawning processes overhauled.
9510 * std: Various atomic types added to `unstable::atomic`.
9511 * std: Various types implement `Zero`.
9512 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9513 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9514 * std: Added `os::mkdir_recursive`.
9515 * std: Added `os::glob` function performs filesystems globs.
9516 * std: `FuzzyEq` renamed to `ApproxEq`.
9517 * std: `Map` now defines `pop` and `swap` methods.
9518 * std: `Cell` constructors converted to static methods.
9519 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9520 * extra: `flate` module moved from `std` to `extra`.
9521 * extra: `fileinput` module for iterating over a series of files.
9522 * extra: `Complex` number type and `complex` module.
9523 * extra: `Rational` number type and `rational` module.
9524 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9525 * extra: `term` uses terminfo now, is more correct.
9526 * extra: `arc` functions converted to methods.
9527 * extra: Implementation of fixed output size variations of SHA-2.
9530 * `unused_variables` lint mode for unused variables (default: warn).
9531 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9533 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9535 * `dead_assignment` lint mode for unread variables (default: warn).
9536 * `unnecessary_allocation` lint mode detects some heap allocations that are
9537 immediately borrowed so could be written without allocating (default: warn).
9538 * `missing_doc` lint mode (default: allow).
9539 * `unreachable_code` lint mode (default: warn).
9540 * The `rusti` command has been rewritten and a number of bugs addressed.
9541 * rustc outputs in color on more terminals.
9542 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9543 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9544 * Compiling with `-g` will make the binary record information about
9545 dynamic borrowcheck failures for debugging.
9546 * rustdoc has a nicer stylesheet.
9547 * Various improvements to rustdoc.
9548 * Improvements to rustpkg (see the detailed release notes).
9551 Version 0.6 (2013-04-03)
9552 ========================
9554 * ~2100 changes, numerous bugfixes
9557 * The self type parameter in traits is now spelled `Self`
9558 * The `self` parameter in trait and impl methods must now be explicitly
9559 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9560 * Static methods no longer require the `static` keyword and instead
9561 are distinguished by the lack of a `self` parameter
9562 * Replaced the `Durable` trait with the `'static` lifetime
9563 * The old closure type syntax with the trailing sigil has been
9564 removed in favor of the more consistent leading sigil
9565 * `super` is a keyword, and may be prefixed to paths
9566 * Trait bounds are separated with `+` instead of whitespace
9567 * Traits are implemented with `impl Trait for Type`
9568 instead of `impl Type: Trait`
9569 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9570 * The `export` keyword has finally been removed
9571 * The `move` keyword has been removed (see "Semantic changes")
9572 * The interior mutability qualifier on vectors, `[mut T]`, has been
9573 removed. Use `&mut [T]`, etc.
9574 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9575 * `fail` is no longer a keyword. Use `fail!()`
9576 * `assert` is no longer a keyword. Use `assert!()`
9577 * `log` is no longer a keyword. use `debug!`, etc.
9578 * 1-tuples may be represented as `(T,)`
9579 * Struct fields may no longer be `mut`. Use inherited mutability,
9580 `@mut T`, `core::mut` or `core::cell`
9581 * `extern mod { ... }` is no longer valid syntax for foreign
9582 function modules. Use extern blocks: `extern { ... }`
9583 * Newtype enums removed. Use tuple-structs.
9584 * Trait implementations no longer support visibility modifiers
9585 * Pattern matching over vectors improved and expanded
9586 * `const` renamed to `static` to correspond to lifetime name,
9587 and make room for future `static mut` unsafe mutable globals.
9588 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9589 * `Clone` implementations can be automatically generated with
9590 `#[deriving(Clone)]`
9591 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9592 instead of `foo as Bar`.
9593 * Fixed length vector types are now written as `[int, .. 3]`
9594 instead of `[int * 3]`.
9595 * Fixed length vector types can express the length as a constant
9596 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9599 * Types with owned pointers or custom destructors move by default,
9600 eliminating the `move` keyword
9601 * All foreign functions are considered unsafe
9602 * &mut is now unaliasable
9603 * Writes to borrowed @mut pointers are prevented dynamically
9605 * The name of the main function can be customized using #[main]
9606 * The default type of an inferred closure is &fn instead of @fn
9607 * `use` statements may no longer be "chained" - they cannot import
9608 identifiers imported by previous `use` statements
9609 * `use` statements are crate relative, importing from the "top"
9610 of the crate by default. Paths may be prefixed with `super::`
9611 or `self::` to change the search behavior.
9612 * Method visibility is inherited from the implementation declaration
9613 * Structural records have been removed
9614 * Many more types can be used in static items, including enums
9615 'static-lifetime pointers and vectors
9616 * Pattern matching over vectors improved and expanded
9617 * Typechecking of closure types has been overhauled to
9618 improve inference and eliminate unsoundness
9619 * Macros leave scope at the end of modules, unless that module is
9620 tagged with #[macro_escape]
9623 * Added big integers to `std::bigint`
9624 * Removed `core::oldcomm` module
9625 * Added pipe-based `core::comm` module
9626 * Numeric traits have been reorganized under `core::num`
9627 * `vec::slice` finally returns a slice
9628 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9629 * Containers reorganized around traits in `core::container`
9630 * `core::dvec` removed, `~[T]` is a drop-in replacement
9631 * `core::send_map` renamed to `core::hashmap`
9632 * `std::map` removed; replaced with `core::hashmap`
9633 * `std::treemap` reimplemented as an owned balanced tree
9634 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9635 * `core::trie` added as a fast ordered map for integer keys
9636 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9637 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9638 overload the comparison operators, whereas `TotalOrd` is used
9639 by certain container types
9642 * Replaced the 'cargo' package manager with 'rustpkg'
9643 * Added all-purpose 'rust' tool
9644 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9645 * rustc now *attempts* to offer spelling suggestions
9646 * Improved support for ARM and Android
9647 * Preliminary MIPS backend
9648 * Improved foreign function ABI implementation for x86, x86_64
9649 * Various memory usage improvements
9650 * Rust code may be embedded in foreign code under limited circumstances
9651 * Inline assembler supported by new asm!() syntax extension.
9654 Version 0.5 (2012-12-21)
9655 ===========================
9657 * ~900 changes, numerous bugfixes
9660 * Removed `<-` move operator
9661 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9662 * Removed old fixed length vector syntax - `[T]/N`
9663 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9664 * Macros may now expand to items and statements
9665 * `a.b()` is always parsed as a method call, never as a field projection
9666 * `Eq` and `IterBytes` implementations can be automatically generated
9667 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9668 * Removed the special crate language for `.rc` files
9669 * Function arguments may consist of any irrefutable pattern
9672 * `&` and `~` pointers may point to objects
9673 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9674 * Enum variants may be structs
9675 * Destructors can be added to all nominal types with the Drop trait
9676 * Structs and nullary enum variants may be constants
9677 * Values that cannot be implicitly copied are now automatically moved
9678 without writing `move` explicitly
9679 * `&T` may now be coerced to `*T`
9680 * Coercions happen in `let` statements as well as function calls
9681 * `use` statements now take crate-relative paths
9682 * The module and type namespaces have been merged so that static
9683 method names can be resolved under the trait in which they are
9686 * Improved support for language features
9687 * Trait inheritance works in many scenarios
9688 * More support for explicit self arguments in methods - `self`, `&self`
9689 `@self`, and `~self` all generally work as expected
9690 * Static methods work in more situations
9691 * Experimental: Traits may declare default methods for the implementations
9695 * New condition handling system in `core::condition`
9696 * Timsort added to `std::sort`
9697 * New priority queue, `std::priority_queue`
9698 * Pipes for serializable types, `std::flatpipes'
9699 * Serialization overhauled to be trait-based
9700 * Expanded `getopts` definitions
9701 * Moved futures to `std`
9702 * More functions are pure now
9703 * `core::comm` renamed to `oldcomm`. Still deprecated
9704 * `rustdoc` and `cargo` are libraries now
9707 * Added a preliminary REPL, `rusti`
9708 * License changed from MIT to dual MIT/APL2
9711 Version 0.4 (2012-10-15)
9712 ==========================
9714 * ~2000 changes, numerous bugfixes
9717 * All keywords are now strict and may not be used as identifiers anywhere
9718 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9719 'of', 'with', 'to', 'class'.
9720 * Classes are replaced with simpler structs
9721 * Explicit method self types
9722 * `ret` became `return` and `alt` became `match`
9723 * `import` is now `use`; `use is now `extern mod`
9724 * `extern mod { ... }` is now `extern { ... }`
9725 * `use mod` is the recommended way to import modules
9726 * `pub` and `priv` replace deprecated export lists
9727 * The syntax of `match` pattern arms now uses fat arrow (=>)
9728 * `main` no longer accepts an args vector; use `os::args` instead
9731 * Trait implementations are now coherent, ala Haskell typeclasses
9732 * Trait methods may be static
9733 * Argument modes are deprecated
9734 * Borrowed pointers are much more mature and recommended for use
9735 * Strings and vectors in the static region are stored in constant memory
9736 * Typestate was removed
9737 * Resolution rewritten to be more reliable
9738 * Support for 'dual-mode' data structures (freezing and thawing)
9741 * Most binary operators can now be overloaded via the traits in
9743 * `std::net::url` for representing URLs
9744 * Sendable hash maps in `core::send_map`
9745 * `core::task' gained a (currently unsafe) task-local storage API
9748 * An efficient new intertask communication primitive called the pipe,
9749 along with a number of higher-level channel types, in `core::pipes`
9750 * `std::arc`, an atomically reference counted, immutable, shared memory
9752 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9753 * Futures are now based on pipes and sendable
9754 * More robust linked task failure
9755 * Improved task builder API
9758 * Improved error reporting
9759 * Preliminary JIT support
9760 * Preliminary work on precise GC
9761 * Extensive architectural improvements to rustc
9762 * Begun a transition away from buggy C++-based reflection (shape) code to
9763 Rust-based (visitor) code
9764 * All hash functions and tables converted to secure, randomized SipHash
9767 Version 0.3 (2012-07-12)
9768 ========================
9770 * ~1900 changes, numerous bugfixes
9772 * New coding conveniences
9773 * Integer-literal suffix inference
9774 * Per-item control over warnings, errors
9775 * #[cfg(windows)] and #[cfg(unix)] attributes
9776 * Documentation comments
9777 * More compact closure syntax
9778 * 'do' expressions for treating higher-order functions as
9780 * *-patterns (wildcard extended to all constructor fields)
9783 * Name resolution pass and exhaustiveness checker rewritten
9784 * Region pointers and borrow checking supersede alias
9786 * Init-ness checking is now provided by a region-based liveness
9787 pass instead of the typestate pass; same for last-use analysis
9788 * Extensive work on region pointers
9790 * Experimental new language features
9791 * Slices and fixed-size, interior-allocated vectors
9792 * #!-comments for lang versioning, shell execution
9793 * Destructors and iface implementation for classes;
9794 type-parameterized classes and class methods
9795 * 'const' type kind for types that can be used to implement
9796 shared-memory concurrency patterns
9800 * Removal of various obsolete features
9801 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9802 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9804 * Constructs: do-while loops ('do' repurposed), fn binding,
9805 resources (replaced by destructors)
9807 * Compiler reorganization
9808 * Syntax-layer of compiler split into separate crate
9809 * Clang (from LLVM project) integrated into build
9810 * Typechecker split into sub-modules
9813 * New time functions
9814 * Extension methods for many built-in types
9815 * Arc: atomic-refcount read-only / exclusive-use shared cells
9816 * Par: parallel map and search routines
9817 * Extensive work on libuv interface
9818 * Much vector code moved to libraries
9819 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9820 #include, #include_str, #include_bin
9823 * Cargo automatically resolves dependencies
9826 Version 0.2 (2012-03-29)
9827 =========================
9829 * >1500 changes, numerous bugfixes
9831 * New docs and doc tooling
9833 * New port: FreeBSD x86_64
9835 * Compilation model enhancements
9836 * Generics now specialized, multiply instantiated
9837 * Functions now inlined across separate crates
9839 * Scheduling, stack and threading fixes
9840 * Noticeably improved message-passing performance
9841 * Explicit schedulers
9845 * Experimental new language features
9846 * Operator overloading
9850 * Various language extensions
9851 * C-callback function types: 'crust fn ...'
9852 * Infinite-loop construct: 'loop { ... }'
9853 * Shorten 'mutable' to 'mut'
9854 * Required mutable-local qualifier: 'let mut ...'
9855 * Basic glob-exporting: 'export foo::*;'
9856 * Alt now exhaustive, 'alt check' for runtime-checked
9857 * Block-function form of 'for' loop, with 'break' and 'ret'.
9860 * AST quasi-quote syntax extension
9861 * Revived libuv interface
9862 * New modules: core::{future, iter}, std::arena
9863 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9864 * Extensive cleanup, regularization in libstd, libcore
9867 Version 0.1 (2012-01-20)
9868 ===============================
9870 * Most language features work, including:
9871 * Unique pointers, unique closures, move semantics
9872 * Interface-constrained generics
9873 * Static interface dispatch
9875 * Multithread task scheduling
9876 * Typestate predicates
9877 * Failure unwinding, destructors
9878 * Pattern matching and destructuring assignment
9879 * Lightweight block-lambda syntax
9880 * Preliminary macro-by-example
9882 * Compiler works with the following configurations:
9883 * Linux: x86 and x86_64 hosts and targets
9884 * macOS: x86 and x86_64 hosts and targets
9885 * Windows: x86 hosts and targets
9887 * Cross compilation / multi-target configuration supported.
9889 * Preliminary API-documentation and package-management tools included.
9893 * Documentation is incomplete.
9895 * Performance is below intended target.
9897 * Standard library APIs are subject to extensive change, reorganization.
9899 * Language-level versioning is not yet operational - future code will