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]
53 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
59 - [`Arc::decrement_strong_count`]
60 - [`Arc::increment_strong_count`]
61 - [`Once::call_once_force`]
62 - [`Peekable::next_if_eq`]
63 - [`Peekable::next_if`]
64 - [`Seek::stream_position`]
66 - [`panic::panic_any`]
68 - [`ptr::addr_of_mut!`]
69 - [`slice::fill_with`]
70 - [`slice::split_inclusive_mut`]
71 - [`slice::split_inclusive`]
72 - [`slice::strip_prefix`]
73 - [`slice::strip_suffix`]
74 - [`str::split_inclusive`]
78 - [`VecDeque::range_mut`]
82 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
83 codegen option.][cargo/9112]
84 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
85 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
86 to avoid unifying features of dependencies where that unification could be unwanted.
87 Such as using the same dependency with a `std` feature in a build scripts and
88 proc-macros, while using the `no-std` feature in the final binary. See the
89 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
94 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
95 - [You can now provide a `--default-theme` flag which sets the default theme to use for
96 documentation.][79642]
98 Various improvements to intra-doc links:
100 - [You can link to non-path primitives such as `slice`.][80181]
101 - [You can link to associated items.][74489]
102 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
106 - [You can now pass `--include-ignored` to tests (e.g. with
107 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
112 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
113 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
115 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
116 for the distributed artifacts.][81521]
117 - `armv5te-unknown-linux-gnueabi`
118 - `sparc64-unknown-linux-gnu`
119 - `thumbv7neon-unknown-linux-gnueabihf`
120 - `armv7-unknown-linux-gnueabi`
121 - `x86_64-unknown-linux-gnux32`
122 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
127 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
129 [79135]: https://github.com/rust-lang/rust/pull/79135
130 [74489]: https://github.com/rust-lang/rust/pull/74489
131 [76934]: https://github.com/rust-lang/rust/pull/76934
132 [79570]: https://github.com/rust-lang/rust/pull/79570
133 [80181]: https://github.com/rust-lang/rust/pull/80181
134 [79642]: https://github.com/rust-lang/rust/pull/79642
135 [80945]: https://github.com/rust-lang/rust/pull/80945
136 [80279]: https://github.com/rust-lang/rust/pull/80279
137 [80053]: https://github.com/rust-lang/rust/pull/80053
138 [79502]: https://github.com/rust-lang/rust/pull/79502
139 [75180]: https://github.com/rust-lang/rust/pull/75180
140 [79135]: https://github.com/rust-lang/rust/pull/79135
141 [81521]: https://github.com/rust-lang/rust/pull/81521
142 [80968]: https://github.com/rust-lang/rust/pull/80968
143 [80959]: https://github.com/rust-lang/rust/pull/80959
144 [80718]: https://github.com/rust-lang/rust/pull/80718
145 [80653]: https://github.com/rust-lang/rust/pull/80653
146 [80579]: https://github.com/rust-lang/rust/pull/80579
147 [79998]: https://github.com/rust-lang/rust/pull/79998
148 [78044]: https://github.com/rust-lang/rust/pull/78044
149 [81455]: https://github.com/rust-lang/rust/pull/81455
150 [80764]: https://github.com/rust-lang/rust/pull/80764
151 [80749]: https://github.com/rust-lang/rust/pull/80749
152 [80662]: https://github.com/rust-lang/rust/pull/80662
153 [79134]: https://github.com/rust-lang/rust/pull/79134
154 [80966]: https://github.com/rust-lang/rust/pull/80966
155 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
156 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
157 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
158 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
159 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
160 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
161 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
162 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
163 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
164 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
165 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
166 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
167 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
168 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
169 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
170 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
171 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
172 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
173 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
174 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
175 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
176 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
177 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
179 Version 1.50.0 (2021-02-11)
180 ============================
183 -----------------------
184 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
185 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
186 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
189 -----------------------
190 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
191 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
192 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
193 - [Dropped support for all cloudabi targets.][78439]
195 \* Refer to Rust's [platform support page][platform-support-doc] for more
196 information on Rust's tiered platform support.
199 -----------------------
201 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
202 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
203 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
204 This value cannot be a valid file descriptor, and now means `Option<File>` takes
205 up the same amount of space as `File`.
211 - [`btree_map::Entry::or_insert_with_key`]
214 - [`hash_map::Entry::or_insert_with_key`]
218 - [`UnsafeCell::get_mut`]
220 The following previously stable methods are now `const`.
222 - [`IpAddr::is_ipv4`]
223 - [`IpAddr::is_ipv6`]
224 - [`IpAddr::is_unspecified`]
225 - [`IpAddr::is_loopback`]
226 - [`IpAddr::is_multicast`]
227 - [`Ipv4Addr::octets`]
228 - [`Ipv4Addr::is_loopback`]
229 - [`Ipv4Addr::is_private`]
230 - [`Ipv4Addr::is_link_local`]
231 - [`Ipv4Addr::is_multicast`]
232 - [`Ipv4Addr::is_broadcast`]
233 - [`Ipv4Addr::is_documentation`]
234 - [`Ipv4Addr::to_ipv6_compatible`]
235 - [`Ipv4Addr::to_ipv6_mapped`]
236 - [`Ipv6Addr::segments`]
237 - [`Ipv6Addr::is_unspecified`]
238 - [`Ipv6Addr::is_loopback`]
239 - [`Ipv6Addr::is_multicast`]
240 - [`Ipv6Addr::to_ipv4`]
243 - [`Layout::from_size_align`]
244 - `pow` for all integer types.
245 - `checked_pow` for all integer types.
246 - `saturating_pow` for all integer types.
247 - `wrapping_pow` for all integer types.
248 - `next_power_of_two` for all unsigned integer types.
249 - `checked_next_power_of_two` for all unsigned integer types.
252 -----------------------
254 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
255 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
256 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
257 contents of that directory for changes.][cargo/8973]
258 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
263 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
264 - [Running tests will now print the total time taken to execute.][75752]
269 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
270 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
271 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
272 unhygenic `macro_rules!` macros.][79472]
273 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
274 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
275 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
276 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
277 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
278 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
280 [74989]: https://github.com/rust-lang/rust/pull/74989
281 [79261]: https://github.com/rust-lang/rust/pull/79261
282 [79896]: https://github.com/rust-lang/rust/pull/79896
283 [79484]: https://github.com/rust-lang/rust/pull/79484
284 [79472]: https://github.com/rust-lang/rust/pull/79472
285 [79270]: https://github.com/rust-lang/rust/pull/79270
286 [79003]: https://github.com/rust-lang/rust/pull/79003
287 [78864]: https://github.com/rust-lang/rust/pull/78864
288 [78636]: https://github.com/rust-lang/rust/pull/78636
289 [78439]: https://github.com/rust-lang/rust/pull/78439
290 [78343]: https://github.com/rust-lang/rust/pull/78343
291 [78296]: https://github.com/rust-lang/rust/pull/78296
292 [78068]: https://github.com/rust-lang/rust/pull/78068
293 [75752]: https://github.com/rust-lang/rust/pull/75752
294 [74699]: https://github.com/rust-lang/rust/pull/74699
295 [78142]: https://github.com/rust-lang/rust/pull/78142
296 [77484]: https://github.com/rust-lang/rust/pull/77484
297 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
298 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
299 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
300 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
301 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
302 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
303 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
304 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
305 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
306 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
307 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
308 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
309 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
310 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
311 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
312 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
313 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
314 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
315 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
316 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
317 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
318 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
319 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
320 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
321 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
322 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
323 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
324 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
325 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
326 [`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
327 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
328 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
329 [`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
330 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
333 Version 1.49.0 (2020-12-31)
334 ============================
337 -----------------------
339 - [Unions can now implement `Drop`, and you can now have a field in a union
340 with `ManuallyDrop<T>`.][77547]
341 - [You can now cast uninhabited enums to integers.][76199]
342 - [You can now bind by reference and by move in patterns.][76119] This
343 allows you to selectively borrow individual components of a type. E.g.
351 let person = Person {
352 name: String::from("Alice"),
356 // `name` is moved out of person, but `age` is referenced.
357 let Person { name, ref age } = person;
358 println!("{} {}", name, age);
362 -----------------------
364 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
365 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
366 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
367 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
368 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
369 - [Output from threads spawned in tests is now captured.][78227]
370 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
372 \* Refer to Rust's [platform support page][platform-support-doc] for more
373 information on Rust's tiered platform support.
376 -----------------------
378 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
379 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
384 - [`slice::select_nth_unstable`]
385 - [`slice::select_nth_unstable_by`]
386 - [`slice::select_nth_unstable_by_key`]
388 The following previously stable methods are now `const`.
391 - [`Poll::is_pending`]
394 -----------------------
395 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
396 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
397 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
398 variable will be set if the crate being built is one the user selected to build, either
399 with `-p` or through defaults.
400 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
406 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
407 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
408 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
409 Previously such invalid or unused attributes could be ignored.
410 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
411 read [this post about the changes][rustdoc-ws-post] for more details.
412 - [Trait bounds are no longer inferred for associated types.][79904]
416 These changes provide no direct user facing benefits, but represent significant
417 improvements to the internals and overall performance of rustc and
420 - [rustc's internal crates are now compiled using the `initial-exec` Thread
421 Local Storage model.][78201]
422 - [Calculate visibilities once in resolve.][78077]
423 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
424 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
427 [75991]: https://github.com/rust-lang/rust/pull/75991
428 [78951]: https://github.com/rust-lang/rust/pull/78951
429 [78848]: https://github.com/rust-lang/rust/pull/78848
430 [78746]: https://github.com/rust-lang/rust/pull/78746
431 [78376]: https://github.com/rust-lang/rust/pull/78376
432 [78228]: https://github.com/rust-lang/rust/pull/78228
433 [78227]: https://github.com/rust-lang/rust/pull/78227
434 [78201]: https://github.com/rust-lang/rust/pull/78201
435 [78109]: https://github.com/rust-lang/rust/pull/78109
436 [78077]: https://github.com/rust-lang/rust/pull/78077
437 [77997]: https://github.com/rust-lang/rust/pull/77997
438 [77703]: https://github.com/rust-lang/rust/pull/77703
439 [77547]: https://github.com/rust-lang/rust/pull/77547
440 [77015]: https://github.com/rust-lang/rust/pull/77015
441 [76199]: https://github.com/rust-lang/rust/pull/76199
442 [76119]: https://github.com/rust-lang/rust/pull/76119
443 [75914]: https://github.com/rust-lang/rust/pull/75914
444 [79004]: https://github.com/rust-lang/rust/pull/79004
445 [78676]: https://github.com/rust-lang/rust/pull/78676
446 [79904]: https://github.com/rust-lang/rust/issues/79904
447 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
448 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
449 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
450 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
451 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
452 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
453 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
454 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
455 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
456 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
457 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
459 Version 1.48.0 (2020-11-19)
460 ==========================
465 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
466 is still rejected *semantically*, but can now be parsed by procedural macros.
470 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
471 `rustc` whether to link its own C runtime and libraries or to rely on a external
472 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
473 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
474 Note: If you're using cargo you must explicitly pass the `--target` flag.
475 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
477 \* Refer to Rust's [platform support page][platform-support-doc] for more
478 information on Rust's tiered platform support.
482 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
483 and `&Stderr`.][76275]
484 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
485 - [The `matches!` macro now supports having a trailing comma.][74880]
486 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
487 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
491 - [`slice::as_ptr_range`]
492 - [`slice::as_mut_ptr_range`]
493 - [`VecDeque::make_contiguous`]
494 - [`future::pending`]
497 The following previously stable methods are now `const fn`'s:
499 - [`Option::is_some`]
500 - [`Option::is_none`]
505 - [`Ordering::reverse`]
513 - [You can now link to items in `rustdoc` using the intra-doc link
514 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
515 a link to `std::future`'s documentation. See ["Linking to items by
516 name"][intradoc-links] for more information.
517 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
518 when searching through `rustdoc`'s UI.][75740]
522 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
523 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
524 promoted to `'static` lifetime any more inside `const fn`s.
525 - [Associated type bindings on trait objects are now verified to meet the bounds
526 declared on the trait when checking that they implement the trait.][27675]
527 - [When trait bounds on associated types or opaque types are ambiguous, the
528 compiler no longer makes an arbitrary choice on which bound to use.][54121]
529 - [Fixed recursive nonterminals not being expanded in macros during
530 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
531 correctly handling recursive nonterminal tokens.
532 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
533 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
534 in places where they have no effect.][73461]
535 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
536 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
537 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
538 disallow zero-initialization.][71274]
539 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
540 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
541 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
542 see the [`catch_unwind`] documentation for further information.
548 These changes provide no direct user facing benefits, but represent significant
549 improvements to the internals and overall performance of rustc and
552 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
553 You can continue building with `make` by setting `ninja=false` in
555 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
556 - [Made `ensure_sufficient_stack()` non-generic][76680]
558 [78143]: https://github.com/rust-lang/rust/issues/78143
559 [76680]: https://github.com/rust-lang/rust/pull/76680/
560 [76030]: https://github.com/rust-lang/rust/pull/76030/
561 [70212]: https://github.com/rust-lang/rust/pull/70212/
562 [27675]: https://github.com/rust-lang/rust/issues/27675/
563 [54121]: https://github.com/rust-lang/rust/issues/54121/
564 [71274]: https://github.com/rust-lang/rust/pull/71274/
565 [77386]: https://github.com/rust-lang/rust/pull/77386/
566 [77153]: https://github.com/rust-lang/rust/pull/77153/
567 [77055]: https://github.com/rust-lang/rust/pull/77055/
568 [76275]: https://github.com/rust-lang/rust/pull/76275/
569 [76310]: https://github.com/rust-lang/rust/pull/76310/
570 [76420]: https://github.com/rust-lang/rust/pull/76420/
571 [76158]: https://github.com/rust-lang/rust/pull/76158/
572 [75857]: https://github.com/rust-lang/rust/pull/75857/
573 [75585]: https://github.com/rust-lang/rust/pull/75585/
574 [75740]: https://github.com/rust-lang/rust/pull/75740/
575 [75502]: https://github.com/rust-lang/rust/pull/75502/
576 [74880]: https://github.com/rust-lang/rust/pull/74880/
577 [74922]: https://github.com/rust-lang/rust/pull/74922/
578 [74430]: https://github.com/rust-lang/rust/pull/74430/
579 [74194]: https://github.com/rust-lang/rust/pull/74194/
580 [73461]: https://github.com/rust-lang/rust/pull/73461/
581 [73166]: https://github.com/rust-lang/rust/pull/73166/
582 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
583 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
584 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
585 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
586 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
587 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
588 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
589 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
590 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
591 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
592 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
593 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
594 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
595 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
596 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
599 Version 1.47.0 (2020-10-08)
600 ==========================
604 - [Closures will now warn when not used.][74869]
608 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
609 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
611 - [Upgraded to LLVM 11.][73526]
612 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
613 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
614 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
616 \* Refer to Rust's [platform support page][platform-support-doc] for more
617 information on Rust's tiered platform support.
621 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
622 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
623 those of length less than 33.][74060]
624 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
625 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
626 `PartialEq`, and `PartialOrd`.][73583]
631 - [`Range::is_empty`]
632 - [`RangeInclusive::is_empty`]
633 - [`Result::as_deref`]
634 - [`Result::as_deref_mut`]
636 - [`pointer::offset_from`]
640 The following previously stable APIs have now been made const.
642 - [The `new` method for all `NonZero` integers.][73858]
643 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
644 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
645 methods for all integers.][73858]
646 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
647 signed integers.][73858]
648 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
649 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
650 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
651 `is_ascii_control` methods for `char` and `u8`.][73858]
655 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
656 You can override this by setting the following in your `Cargo.toml`.
658 [profile.release.build-override]
661 - [`cargo-help` will now display man pages for commands rather just the
662 `--help` text.][cargo/8456]
663 - [`cargo-metadata` now emits a `test` field indicating if a target has
664 tests enabled.][cargo/8478]
665 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
666 - [`cargo-publish` will now use an alternative registry by default if it's the
667 only registry specified in `package.publish`.][cargo/8571]
671 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
672 type based search.][75366]
673 - [Added the Ayu theme to rustdoc.][71237]
677 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
678 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
679 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
680 help to preserve more span information.][73084] These changes may cause
681 compiliation errors if your macro was unhygenic or didn't correctly handle
683 - [Moved support for the CloudABI target to tier 3.][75568]
684 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
685 - [Added the `rustc-docs` component.][75560] This allows you to install
686 and read the documentation for the compiler internal APIs. (Currently only
687 available for `x86_64-unknown-linux-gnu`.)
692 - [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.
694 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
695 [75048]: https://github.com/rust-lang/rust/pull/75048/
696 [74163]: https://github.com/rust-lang/rust/pull/74163/
697 [71237]: https://github.com/rust-lang/rust/pull/71237/
698 [74869]: https://github.com/rust-lang/rust/pull/74869/
699 [73858]: https://github.com/rust-lang/rust/pull/73858/
700 [75716]: https://github.com/rust-lang/rust/pull/75716/
701 [75908]: https://github.com/rust-lang/rust/pull/75908/
702 [75516]: https://github.com/rust-lang/rust/pull/75516/
703 [75560]: https://github.com/rust-lang/rust/pull/75560/
704 [75568]: https://github.com/rust-lang/rust/pull/75568/
705 [75366]: https://github.com/rust-lang/rust/pull/75366/
706 [75204]: https://github.com/rust-lang/rust/pull/75204/
707 [74650]: https://github.com/rust-lang/rust/pull/74650/
708 [74419]: https://github.com/rust-lang/rust/pull/74419/
709 [73964]: https://github.com/rust-lang/rust/pull/73964/
710 [74021]: https://github.com/rust-lang/rust/pull/74021/
711 [74060]: https://github.com/rust-lang/rust/pull/74060/
712 [73893]: https://github.com/rust-lang/rust/pull/73893/
713 [73526]: https://github.com/rust-lang/rust/pull/73526/
714 [73583]: https://github.com/rust-lang/rust/pull/73583/
715 [73084]: https://github.com/rust-lang/rust/pull/73084/
716 [73197]: https://github.com/rust-lang/rust/pull/73197/
717 [72488]: https://github.com/rust-lang/rust/pull/72488/
718 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
719 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
720 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
721 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
722 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
723 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
724 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
725 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
726 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
727 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
728 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
729 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
730 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
731 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
732 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
735 Version 1.46.0 (2020-08-27)
736 ==========================
740 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
741 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
742 const functions.][73862]
743 - [The `#[track_caller]` attribute can now be added to functions to use the
744 function's caller's location information for panic messages.][72445]
745 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
746 `x.0.0` over `(x.0).0`.
747 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
748 You currently can't use `mem::transmute` in constant functions.
752 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
753 - [Enabled static "Position Independent Executables" by default
754 for `x86_64-unknown-linux-musl`.][70740]
758 - [`mem::forget` is now a `const fn`.][73887]
759 - [`String` now implements `From<char>`.][73466]
760 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
761 integer types.][73032]
762 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
763 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
764 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
765 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
766 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
767 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
772 - [`vec::Drain::as_slice`]
776 Added a number of new environment variables that are now available when
777 compiling your crate.
779 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
780 the specific binary being compiled and the name of the crate.
781 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
782 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
786 - [The target configuration option `abi_blacklist` has been renamed
787 to `unsupported_abis`.][74150] The old name will still continue to work.
788 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
789 This was previously accepted but will become a hard error in a future release.
790 - [Rustc will fail to compile if you have a struct with
791 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
793 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
794 ensure that spans have the correct information, and may cause breakage if you
795 were relying on receiving spans with dummy information.
796 - [The InnoSetup installer for Windows is no longer available.][72569] This was
797 a legacy installer that was replaced by a MSI installer a few years ago but
798 was still being built.
799 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
800 - [Rustc will no longer accept overlapping trait implementations that only
801 differ in how the lifetime was bound.][72493]
802 - [Rustc now correctly relates the lifetime of an existential associated
803 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
804 you to pass a shorter lifetime than expected.
805 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
806 The library will need to be installed for `rustc` to work, even though we
807 expect it to be already available on most systems.
808 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
810 - [Pretty printing of some tokens in procedural macros changed.][75453] The
811 exact output returned by rustc's pretty printing is an unstable
812 implementation detail: we recommend any macro relying on it to switch to a
813 more robust parsing system.
815 [75453]: https://github.com/rust-lang/rust/issues/75453/
816 [74820]: https://github.com/rust-lang/rust/issues/74820/
817 [74420]: https://github.com/rust-lang/rust/issues/74420/
818 [74109]: https://github.com/rust-lang/rust/pull/74109/
819 [74150]: https://github.com/rust-lang/rust/pull/74150/
820 [73862]: https://github.com/rust-lang/rust/pull/73862/
821 [73887]: https://github.com/rust-lang/rust/pull/73887/
822 [73466]: https://github.com/rust-lang/rust/pull/73466/
823 [73516]: https://github.com/rust-lang/rust/pull/73516/
824 [73293]: https://github.com/rust-lang/rust/pull/73293/
825 [73007]: https://github.com/rust-lang/rust/pull/73007/
826 [73032]: https://github.com/rust-lang/rust/pull/73032/
827 [72920]: https://github.com/rust-lang/rust/pull/72920/
828 [72569]: https://github.com/rust-lang/rust/pull/72569/
829 [72583]: https://github.com/rust-lang/rust/pull/72583/
830 [72584]: https://github.com/rust-lang/rust/pull/72584/
831 [72717]: https://github.com/rust-lang/rust/pull/72717/
832 [72437]: https://github.com/rust-lang/rust/pull/72437/
833 [72445]: https://github.com/rust-lang/rust/pull/72445/
834 [72486]: https://github.com/rust-lang/rust/pull/72486/
835 [72493]: https://github.com/rust-lang/rust/pull/72493/
836 [72331]: https://github.com/rust-lang/rust/pull/72331/
837 [71896]: https://github.com/rust-lang/rust/pull/71896/
838 [71660]: https://github.com/rust-lang/rust/pull/71660/
839 [71322]: https://github.com/rust-lang/rust/pull/71322/
840 [70740]: https://github.com/rust-lang/rust/pull/70740/
841 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
842 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
843 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
844 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
845 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
848 Version 1.45.2 (2020-08-03)
849 ==========================
851 * [Fix bindings in tuple struct patterns][74954]
852 * [Fix track_caller integration with trait objects][74784]
854 [74954]: https://github.com/rust-lang/rust/issues/74954
855 [74784]: https://github.com/rust-lang/rust/issues/74784
858 Version 1.45.1 (2020-07-30)
859 ==========================
861 * [Fix const propagation with references.][73613]
862 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
863 * [Avoid spurious implicit region bound.][74509]
864 * [Install clippy on x.py install][74457]
866 [73613]: https://github.com/rust-lang/rust/pull/73613
867 [73078]: https://github.com/rust-lang/rust/issues/73078
868 [74509]: https://github.com/rust-lang/rust/pull/74509
869 [74457]: https://github.com/rust-lang/rust/pull/74457
872 Version 1.45.0 (2020-07-16)
873 ==========================
877 - [Out of range float to int conversions using `as` has been defined as a saturating
878 conversion.][71269] This was previously undefined behaviour, but you can use the
879 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
880 may be desirable in rare performance sensitive situations.
881 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
883 - [Function like procedural macros can now be used in expression, pattern, and statement
884 positions.][68717] This means you can now use a function-like procedural macro
885 anywhere you can use a declarative (`macro_rules!`) macro.
889 - [You can now override individual target features through the `target-feature`
890 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
891 equivalent to `-C target-feature=+avx2,+fma`.
892 - [Added the `force-unwind-tables` flag.][69984] This option allows
893 rustc to always generate unwind tables regardless of panic strategy.
894 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
895 to include LLVM bitcode into generated `rlib`s (this is on by default).
896 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
897 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
898 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
899 - [Upgraded to LLVM 10.][67759]
901 \* Refer to Rust's [platform support page][platform-support-doc] for more
902 information on Rust's tiered platform support.
907 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
909 - [`proc_macro::TokenStream` now implements `Default`.][72234]
910 - [You can now use `char` with
911 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
912 a range of codepoints.][72413] E.g.
913 you can now write the following;
915 for ch in 'a'..='z' {
919 // Prints "abcdefghijklmnopqrstuvwxyz"
921 - [`OsString` now implements `FromStr`.][71662]
922 - [The `saturating_neg` method has been added to all signed integer primitive
923 types, and the `saturating_abs` method has been added for all integer
924 primitive types.][71886]
925 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
926 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
928 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
929 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
930 integer types.][69813]
931 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
932 integer types.][72324]
933 - [The `fetch_update` method has been added to all atomic integer types.][71843]
938 - [`BTreeMap::remove_entry`]
940 - [`rc::Weak::as_ptr`]
941 - [`rc::Weak::from_raw`]
942 - [`rc::Weak::into_raw`]
943 - [`str::strip_prefix`]
944 - [`str::strip_suffix`]
945 - [`sync::Weak::as_ptr`]
946 - [`sync::Weak::from_raw`]
947 - [`sync::Weak::into_raw`]
948 - [`char::UNICODE_VERSION`]
949 - [`Span::resolved_at`]
950 - [`Span::located_at`]
951 - [`Span::mixed_site`]
952 - [`unix::process::CommandExt::arg0`]
957 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
962 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
963 `~~outdated information~~` becomes "~~outdated information~~".
964 - [Added an emoji to Rustdoc's deprecated API message.][72014]
968 - [Trying to self initialize a static value (that is creating a value using
969 itself) is unsound and now causes a compile error.][71140]
970 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
971 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
972 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
973 previously undocumented and not intended for public use. Rustdoc still provides
974 a non-zero exit code on errors.
975 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
976 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
977 flags while cargo is adding `embed-bitcode` itself. The recommended way to
978 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
979 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
983 - [Make clippy a git subtree instead of a git submodule][70655]
984 - [Unify the undo log of all snapshot types][69464]
986 [71848]: https://github.com/rust-lang/rust/issues/71848/
987 [73420]: https://github.com/rust-lang/rust/issues/73420/
988 [72324]: https://github.com/rust-lang/rust/pull/72324/
989 [71843]: https://github.com/rust-lang/rust/pull/71843/
990 [71886]: https://github.com/rust-lang/rust/pull/71886/
991 [72234]: https://github.com/rust-lang/rust/pull/72234/
992 [72239]: https://github.com/rust-lang/rust/pull/72239/
993 [72397]: https://github.com/rust-lang/rust/pull/72397/
994 [72413]: https://github.com/rust-lang/rust/pull/72413/
995 [72014]: https://github.com/rust-lang/rust/pull/72014/
996 [72062]: https://github.com/rust-lang/rust/pull/72062/
997 [72094]: https://github.com/rust-lang/rust/pull/72094/
998 [72133]: https://github.com/rust-lang/rust/pull/72133/
999 [67759]: https://github.com/rust-lang/rust/pull/67759/
1000 [71900]: https://github.com/rust-lang/rust/pull/71900/
1001 [71928]: https://github.com/rust-lang/rust/pull/71928/
1002 [71662]: https://github.com/rust-lang/rust/pull/71662/
1003 [71716]: https://github.com/rust-lang/rust/pull/71716/
1004 [71447]: https://github.com/rust-lang/rust/pull/71447/
1005 [71269]: https://github.com/rust-lang/rust/pull/71269/
1006 [71095]: https://github.com/rust-lang/rust/pull/71095/
1007 [71140]: https://github.com/rust-lang/rust/pull/71140/
1008 [70655]: https://github.com/rust-lang/rust/pull/70655/
1009 [70705]: https://github.com/rust-lang/rust/pull/70705/
1010 [69984]: https://github.com/rust-lang/rust/pull/69984/
1011 [69813]: https://github.com/rust-lang/rust/pull/69813/
1012 [69464]: https://github.com/rust-lang/rust/pull/69464/
1013 [68717]: https://github.com/rust-lang/rust/pull/68717/
1014 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1015 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1016 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1017 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1018 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1019 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1020 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1021 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1022 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1023 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1024 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1025 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1026 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1027 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1028 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1029 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1030 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1033 Version 1.44.1 (2020-06-18)
1034 ===========================
1036 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1037 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1038 * [Fix crashes when finding backtrace on macOS.][71397]
1039 * [Clippy applies lint levels into different files.][clippy/5356]
1041 [71397]: https://github.com/rust-lang/rust/issues/71397
1042 [73078]: https://github.com/rust-lang/rust/issues/73078
1043 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1044 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1047 Version 1.44.0 (2020-06-04)
1048 ==========================
1052 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1053 - [Added the `unused_braces` lint.][70081]
1055 **Syntax-only changes**
1057 - [Expansion-driven outline module parsing][69838]
1062 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1067 These are still rejected semantically, so you will likely receive an error but
1068 these changes can be seen and parsed by macros and conditional compilation.
1072 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1073 Additionally when in incremental mode rustc defaults to 256 codegen units.
1074 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1075 a panic is thrown.][67502]
1076 - [Added tier 3\* support for the `aarch64-unknown-none` and
1077 `aarch64-unknown-none-softfloat` targets.][68334]
1078 - [Added tier 3 support for `arm64-apple-tvos` and
1079 `x86_64-apple-tvos` targets.][68191]
1084 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1085 `vec![]` to be able to be used in `const` contexts.
1086 - [`convert::Infallible` now implements `Hash`.][70281]
1087 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1088 a `&mut OsStr`.][70048]
1089 - [Unicode 13 is now supported.][69929]
1090 - [`String` now implements `From<&mut str>`.][69661]
1091 - [`IoSlice` now implements `Copy`.][69403]
1092 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1093 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1094 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1095 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1096 integer types.][69373]
1100 - [`PathBuf::with_capacity`]
1101 - [`PathBuf::capacity`]
1102 - [`PathBuf::clear`]
1103 - [`PathBuf::reserve`]
1104 - [`PathBuf::reserve_exact`]
1105 - [`PathBuf::shrink_to_fit`]
1106 - [`f32::to_int_unchecked`]
1107 - [`f64::to_int_unchecked`]
1108 - [`Layout::align_to`]
1109 - [`Layout::pad_to_align`]
1111 - [`Layout::extend`]
1115 - [Added the `cargo tree` command which will print a tree graph of
1116 your dependencies.][cargo/8062] E.g.
1118 mdbook v0.3.2 (/Users/src/rust/mdbook)
1120 │ ├── html5ever v0.24.0
1122 │ │ │ └── cfg-if v0.1.9
1124 │ │ └── markup5ever v0.9.0
1125 │ │ ├── log v0.4.8 (*)
1127 │ │ │ └── phf_shared v0.7.24
1128 │ │ │ ├── siphasher v0.2.3
1129 │ │ │ └── unicase v1.4.2
1130 │ │ │ [build-dependencies]
1131 │ │ │ └── version_check v0.1.5
1134 You can also display dependencies on multiple versions of the same crate with
1135 `cargo tree -d` (short for `cargo tree --duplicates`).
1139 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1140 the version in the sidebar.][69494]
1144 - [Rustc now correctly generates static libraries on Windows GNU targets with
1145 the `.a` extension, rather than the previous `.lib`.][70937]
1146 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1147 - [The `file_name` property in JSON output of macro errors now points the actual
1148 source file rather than the previous format of `<NAME macros>`.][70969]
1149 **Note:** this may not point to a file that actually exists on the user's system.
1150 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1151 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1152 not allow zero initialization such as `NonZeroU8`.][66059] This was
1153 previously a warning.
1154 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1155 operator has been defined as a saturating operation.][71269] This was previously
1156 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1157 continue using the current behaviour, which may be desirable in rare performance
1158 sensitive situations.
1162 These changes provide no direct user facing benefits, but represent significant
1163 improvements to the internals and overall performance of rustc and
1166 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1167 - [Replace big JS dict with JSON parsing.][71250]
1169 [69373]: https://github.com/rust-lang/rust/pull/69373/
1170 [66059]: https://github.com/rust-lang/rust/pull/66059/
1171 [68191]: https://github.com/rust-lang/rust/pull/68191/
1172 [68899]: https://github.com/rust-lang/rust/pull/68899/
1173 [71147]: https://github.com/rust-lang/rust/pull/71147/
1174 [71250]: https://github.com/rust-lang/rust/pull/71250/
1175 [70937]: https://github.com/rust-lang/rust/pull/70937/
1176 [70969]: https://github.com/rust-lang/rust/pull/70969/
1177 [70632]: https://github.com/rust-lang/rust/pull/70632/
1178 [70281]: https://github.com/rust-lang/rust/pull/70281/
1179 [70345]: https://github.com/rust-lang/rust/pull/70345/
1180 [70048]: https://github.com/rust-lang/rust/pull/70048/
1181 [70081]: https://github.com/rust-lang/rust/pull/70081/
1182 [70156]: https://github.com/rust-lang/rust/pull/70156/
1183 [71269]: https://github.com/rust-lang/rust/pull/71269/
1184 [69838]: https://github.com/rust-lang/rust/pull/69838/
1185 [69929]: https://github.com/rust-lang/rust/pull/69929/
1186 [69661]: https://github.com/rust-lang/rust/pull/69661/
1187 [69778]: https://github.com/rust-lang/rust/pull/69778/
1188 [69494]: https://github.com/rust-lang/rust/pull/69494/
1189 [69403]: https://github.com/rust-lang/rust/pull/69403/
1190 [69033]: https://github.com/rust-lang/rust/pull/69033/
1191 [68692]: https://github.com/rust-lang/rust/pull/68692/
1192 [68334]: https://github.com/rust-lang/rust/pull/68334/
1193 [67502]: https://github.com/rust-lang/rust/pull/67502/
1194 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1195 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1196 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1197 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1198 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1199 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1200 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1201 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1202 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1203 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1204 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1205 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1206 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1209 Version 1.43.1 (2020-05-07)
1210 ===========================
1212 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1213 * [Fixed the stabilization of AVX-512 features.][71473]
1214 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1216 [71430]: https://github.com/rust-lang/rust/pull/71430
1217 [71473]: https://github.com/rust-lang/rust/issues/71473
1218 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1221 Version 1.43.0 (2020-04-23)
1222 ==========================
1226 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1227 the type inferred correctly.][68129]
1228 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1230 **Syntax only changes**
1231 - [Allow `type Foo: Ord` syntactically.][69361]
1232 - [Fuse associated and extern items up to defaultness.][69194]
1233 - [Syntactically allow `self` in all `fn` contexts.][68764]
1234 - [Merge `fn` syntax + cleanup item parsing.][68728]
1235 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1236 For example, you may now write:
1238 macro_rules! mac_trait {
1248 These are still rejected *semantically*, so you will likely receive an error but
1249 these changes can be seen and parsed by macros and
1250 conditional compilation.
1255 - [You can now pass multiple lint flags to rustc to override the previous
1256 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1257 everything in the `unused` lint group except `unused-variables` which
1258 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1259 everything in the `unused` lint group **including** `unused-variables` since
1260 the allow flag is specified before the deny flag (and therefore overridden).
1261 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1262 if they are available on `windows-gnu`.][67429]
1263 - [rustc now buffers errors/warnings printed in JSON.][69227]
1267 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1268 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1269 respectively.][69538] **Note** These conversions are only available when `N`
1271 - [You can now use associated constants on floats and integers directly, rather
1272 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1273 `f32::NAN` with no imports.
1274 - [`u8::is_ascii` is now `const`.][68984]
1275 - [`String` now implements `AsMut<str>`.][68742]
1276 - [Added the `primitive` module to `std` and `core`.][67637] This module
1277 reexports Rust's primitive types. This is mainly useful in macros
1278 where you want avoid these types being shadowed.
1279 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1280 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1284 - [`Once::is_completed`]
1289 - [`iter::once_with`]
1293 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1294 your environment.][cargo/7823]
1295 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1296 executable path when running integration tests or benchmarks.][cargo/7697]
1297 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1298 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1302 - [Certain checks in the `const_err` lint were deemed unrelated to const
1303 evaluation][69185], and have been moved to the `unconditional_panic` and
1304 `arithmetic_overflow` lints.
1309 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1310 has been a warning since 1.36.0.
1311 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1312 led to some instances being accepted, and now correctly emits a hard error.
1314 [69340]: https://github.com/rust-lang/rust/pull/69340
1318 These changes provide no direct user facing benefits, but represent significant
1319 improvements to the internals and overall performance of `rustc` and
1322 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1323 - [Improved how rustc generates drop code.][67332]
1324 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1325 - [traits: preallocate 2 Vecs of known initial size][69022]
1326 - [Avoid exponential behaviour when relating types][68772]
1327 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1328 - [Improve performance of coherence checks][68966]
1329 - [Deduplicate types in the generator witness][68672]
1330 - [Invert control in struct_lint_level.][68725]
1332 [67332]: https://github.com/rust-lang/rust/pull/67332/
1333 [67429]: https://github.com/rust-lang/rust/pull/67429/
1334 [67637]: https://github.com/rust-lang/rust/pull/67637/
1335 [67642]: https://github.com/rust-lang/rust/pull/67642/
1336 [67878]: https://github.com/rust-lang/rust/pull/67878/
1337 [67885]: https://github.com/rust-lang/rust/pull/67885/
1338 [68129]: https://github.com/rust-lang/rust/pull/68129/
1339 [68672]: https://github.com/rust-lang/rust/pull/68672/
1340 [68725]: https://github.com/rust-lang/rust/pull/68725/
1341 [68728]: https://github.com/rust-lang/rust/pull/68728/
1342 [68738]: https://github.com/rust-lang/rust/pull/68738/
1343 [68742]: https://github.com/rust-lang/rust/pull/68742/
1344 [68764]: https://github.com/rust-lang/rust/pull/68764/
1345 [68772]: https://github.com/rust-lang/rust/pull/68772/
1346 [68943]: https://github.com/rust-lang/rust/pull/68943/
1347 [68952]: https://github.com/rust-lang/rust/pull/68952/
1348 [68966]: https://github.com/rust-lang/rust/pull/68966/
1349 [68984]: https://github.com/rust-lang/rust/pull/68984/
1350 [69022]: https://github.com/rust-lang/rust/pull/69022/
1351 [69185]: https://github.com/rust-lang/rust/pull/69185/
1352 [69194]: https://github.com/rust-lang/rust/pull/69194/
1353 [69201]: https://github.com/rust-lang/rust/pull/69201/
1354 [69227]: https://github.com/rust-lang/rust/pull/69227/
1355 [69548]: https://github.com/rust-lang/rust/pull/69548/
1356 [69256]: https://github.com/rust-lang/rust/pull/69256/
1357 [69361]: https://github.com/rust-lang/rust/pull/69361/
1358 [69366]: https://github.com/rust-lang/rust/pull/69366/
1359 [69538]: https://github.com/rust-lang/rust/pull/69538/
1360 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1361 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1362 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1363 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1364 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1365 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1366 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1367 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1370 Version 1.42.0 (2020-03-12)
1371 ==========================
1375 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1377 fn foo(words: &[&str]) {
1379 ["Hello", "World", "!", ..] => println!("Hello World!"),
1380 ["Foo", "Bar", ..] => println!("Baz"),
1381 rest => println!("{:?}", rest),
1385 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1386 that you can create an enum that has the exact layout and ABI of the type
1388 - [There are some *syntax-only* changes:][67131]
1389 - `default` is syntactically allowed before items in `trait` definitions.
1390 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1391 leave out their bodies in favor of `;`.
1392 - Bounds on associated types in `impl`s are now syntactically allowed
1393 (e.g. `type Foo: Ord;`).
1394 - `...` (the C-variadic type) may occur syntactically directly as the type of
1395 any function parameter.
1397 These are still rejected *semantically*, so you will likely receive an error
1398 but these changes can be seen and parsed by procedural macros and
1399 conditional compilation.
1403 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1404 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1405 - [`Option::{expect,unwrap}` and
1406 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1407 pointing to the location where they were called, rather than
1408 `core`'s internals. ][67887]
1410 \* Refer to Rust's [platform support page][platform-support-doc] for more
1411 information on Rust's tiered platform support.
1415 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1416 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1417 to implement `Sized`.][67935]
1418 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1419 - [`Layout::new` is now `const`.][66254]
1420 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1425 - [`CondVar::wait_while`]
1426 - [`CondVar::wait_timeout_while`]
1428 - [`DebugMap::value`]
1429 - [`ManuallyDrop::take`]
1431 - [`ptr::slice_from_raw_parts_mut`]
1432 - [`ptr::slice_from_raw_parts`]
1436 - [You no longer need to include `extern crate proc_macro;` to be able to
1437 `use proc_macro;` in the `2018` edition.][cargo/7700]
1441 - [`Error::description` has been deprecated, and its use will now produce a
1442 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1444 [68253]: https://github.com/rust-lang/rust/pull/68253/
1445 [68348]: https://github.com/rust-lang/rust/pull/68348/
1446 [67935]: https://github.com/rust-lang/rust/pull/67935/
1447 [68339]: https://github.com/rust-lang/rust/pull/68339/
1448 [68122]: https://github.com/rust-lang/rust/pull/68122/
1449 [67712]: https://github.com/rust-lang/rust/pull/67712/
1450 [67887]: https://github.com/rust-lang/rust/pull/67887/
1451 [67131]: https://github.com/rust-lang/rust/pull/67131/
1452 [67233]: https://github.com/rust-lang/rust/pull/67233/
1453 [66899]: https://github.com/rust-lang/rust/pull/66899/
1454 [66919]: https://github.com/rust-lang/rust/pull/66919/
1455 [66254]: https://github.com/rust-lang/rust/pull/66254/
1456 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1457 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1458 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1459 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1460 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1461 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1462 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1463 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1464 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1467 Version 1.41.1 (2020-02-27)
1468 ===========================
1470 * [Always check types of static items][69145]
1471 * [Always check lifetime bounds of `Copy` impls][69145]
1472 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1474 [69225]: https://github.com/rust-lang/rust/issues/69225
1475 [69145]: https://github.com/rust-lang/rust/pull/69145
1478 Version 1.41.0 (2020-01-30)
1479 ===========================
1484 - [You can now pass type parameters to foreign items when implementing
1485 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1486 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1487 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1488 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1489 - [You can now use any valid identifier in a `format_args` macro.][66847]
1490 Previously identifiers starting with an underscore were not allowed.
1491 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1492 enum variants.][66183] These are still rejected semantically, but
1493 can be seen and parsed by procedural macros and conditional compilation.
1498 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1499 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1500 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1501 - [You can now pass an arguments file passing the `@path` syntax
1502 to rustc.][66172] Note that the format differs somewhat from what is
1503 found in other tooling; please see [the documentation][argfile-docs] for
1505 - [You can now provide `--extern` flag without a path, indicating that it is
1506 available from the search path or specified with an `-L` flag.][64882]
1508 \* Refer to Rust's [platform support page][platform-support-doc] for more
1509 information on Rust's tiered platform support.
1511 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1516 - [The `core::panic` module is now stable.][66771] It was already stable
1518 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1519 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1520 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1525 - [`Result::map_or`]
1526 - [`Result::map_or_else`]
1527 - [`std::rc::Weak::weak_count`]
1528 - [`std::rc::Weak::strong_count`]
1529 - [`std::sync::Weak::weak_count`]
1530 - [`std::sync::Weak::strong_count`]
1535 - [Cargo will now document all the private items for binary crates
1536 by default.][cargo/7593]
1537 - [`cargo-install` will now reinstall the package if it detects that it is out
1538 of date.][cargo/7560]
1539 - [Cargo.lock now uses a more git friendly format that should help to reduce
1540 merge conflicts.][cargo/7579]
1541 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1542 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1543 optimisation level to `2` for debug builds. You can also use
1544 `[profile.<profile>.build-override]` to override build scripts and
1550 - [You can now specify `edition` in documentation code blocks to compile the block
1551 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1552 should be compiled the 2018 edition of Rust.
1553 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1554 current theme with `--check-theme`.][54733]
1555 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1560 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1561 Apple targets.][apple-32bit-drop] This means that the source code is still
1562 available to build, but the targets are no longer being tested and release
1563 binaries for those platforms will no longer be distributed by the Rust project.
1564 Please refer to the linked blog post for more information.
1566 [54733]: https://github.com/rust-lang/rust/pull/54733/
1567 [61351]: https://github.com/rust-lang/rust/pull/61351/
1568 [67255]: https://github.com/rust-lang/rust/pull/67255/
1569 [66661]: https://github.com/rust-lang/rust/pull/66661/
1570 [66771]: https://github.com/rust-lang/rust/pull/66771/
1571 [66847]: https://github.com/rust-lang/rust/pull/66847/
1572 [66238]: https://github.com/rust-lang/rust/pull/66238/
1573 [66277]: https://github.com/rust-lang/rust/pull/66277/
1574 [66325]: https://github.com/rust-lang/rust/pull/66325/
1575 [66172]: https://github.com/rust-lang/rust/pull/66172/
1576 [66183]: https://github.com/rust-lang/rust/pull/66183/
1577 [65879]: https://github.com/rust-lang/rust/pull/65879/
1578 [65013]: https://github.com/rust-lang/rust/pull/65013/
1579 [64882]: https://github.com/rust-lang/rust/pull/64882/
1580 [64325]: https://github.com/rust-lang/rust/pull/64325/
1581 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1582 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1583 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1584 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1585 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1586 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1587 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1588 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1589 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1590 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1591 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1593 Version 1.40.0 (2019-12-19)
1594 ===========================
1598 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1599 `const` contexts.][65188] e.g.
1602 pub struct Point(i32, i32);
1604 const ORIGIN: Point = {
1605 let constructor = Point;
1611 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1612 indicate that there may be variants or fields added in the future.][64639]
1613 For example this requires adding a wild-card branch (`_ => {}`) to any match
1614 statements on a non-exhaustive `enum`. [(RFC 2008)]
1615 - [You can now use function-like procedural macros in `extern` blocks and in
1616 type positions.][63931] e.g. `type Generated = macro!();`
1617 - [Function-like and attribute procedural macros can now emit
1618 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1619 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1620 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1621 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1625 - [Added tier 3 support\* for the
1626 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1627 - [Added tier 3 support for the
1628 `aarch64-unknown-none-softfloat` target.][64589]
1629 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1630 `mips64el-unknown-linux-muslabi64` targets.][65843]
1632 \* Refer to Rust's [platform support page][platform-support-doc] for more
1633 information on Rust's tiered platform support.
1637 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1641 - [`BTreeMap::get_key_value`]
1642 - [`HashMap::get_key_value`]
1643 - [`Option::as_deref_mut`]
1644 - [`Option::as_deref`]
1645 - [`Option::flatten`]
1646 - [`UdpSocket::peer_addr`]
1647 - [`f32::to_be_bytes`]
1648 - [`f32::to_le_bytes`]
1649 - [`f32::to_ne_bytes`]
1650 - [`f64::to_be_bytes`]
1651 - [`f64::to_le_bytes`]
1652 - [`f64::to_ne_bytes`]
1653 - [`f32::from_be_bytes`]
1654 - [`f32::from_le_bytes`]
1655 - [`f32::from_ne_bytes`]
1656 - [`f64::from_be_bytes`]
1657 - [`f64::from_le_bytes`]
1658 - [`f64::from_ne_bytes`]
1665 - [Cargo will now always display warnings, rather than only on
1666 fresh builds.][cargo/7450]
1667 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1668 now produce an error.][cargo/7507] Previously these flags were ignored.
1669 - [You can now publish `dev-dependencies` without including
1670 a `version`.][cargo/7333]
1674 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1675 when running documentation tests with `rustdoc`.][63803]
1679 - [As previously announced, any previous NLL warnings in the 2015 edition are
1680 now hard errors.][64221]
1681 - [The `include!` macro will now warn if it failed to include the
1682 entire file.][64284] The `include!` macro unintentionally only includes the
1683 first _expression_ in a file, and this can be unintuitive. This will become
1684 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1685 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1686 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1687 or `extern` blocks now correctly emits a hard error.
1689 [65294]: https://github.com/rust-lang/rust/pull/65294/
1690 [66103]: https://github.com/rust-lang/rust/pull/66103/
1691 [65843]: https://github.com/rust-lang/rust/pull/65843/
1692 [65188]: https://github.com/rust-lang/rust/pull/65188/
1693 [65092]: https://github.com/rust-lang/rust/pull/65092/
1694 [64589]: https://github.com/rust-lang/rust/pull/64589/
1695 [64639]: https://github.com/rust-lang/rust/pull/64639/
1696 [64221]: https://github.com/rust-lang/rust/pull/64221/
1697 [64284]: https://github.com/rust-lang/rust/pull/64284/
1698 [63931]: https://github.com/rust-lang/rust/pull/63931/
1699 [64035]: https://github.com/rust-lang/rust/pull/64035/
1700 [63674]: https://github.com/rust-lang/rust/pull/63674/
1701 [63803]: https://github.com/rust-lang/rust/pull/63803/
1702 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1703 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1704 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1705 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1706 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1707 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1708 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1709 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1710 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1711 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1712 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1713 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1714 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1715 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1716 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1717 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1718 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1719 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1720 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1721 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1722 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1723 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1724 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1725 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1726 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1727 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1730 Version 1.39.0 (2019-11-07)
1731 ===========================
1735 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1736 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1737 - [You can now use certain attributes on function, closure, and function pointer
1738 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1739 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1740 attributes applied to items. e.g.
1743 #[cfg(windows)] slice: &[u16],
1744 #[cfg(not(windows))] slice: &[u8],
1749 - [You can now take shared references to bind-by-move patterns in the `if` guards
1750 of `match` arms.][63118] e.g.
1753 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1757 // ---- `nums` is bound by move.
1758 if nums.iter().sum::<u8>() == 10
1759 // ^------ `.iter()` implicitly takes a reference to `nums`.
1762 // ----------- Legal as `nums` was bound by move and so we have ownership.
1764 _ => unreachable!(),
1773 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1774 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1775 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1776 **Note** Cargo currently doesn't use this feature. Refer to
1777 [cargo#7315][cargo/7315] to track this feature's progress.
1778 - [You can now pass `--show-output` argument to test binaries to print the
1779 output of successful tests.][62600]
1782 \* Refer to Rust's [platform support page][platform-support-doc] for more
1783 information on Rust's tiered platform support.
1787 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1788 - [`LinkedList::new` is now a `const` function.][63684]
1789 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1790 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1791 now `const`.][63786]
1795 - [`Pin::into_inner`]
1796 - [`Instant::checked_duration_since`]
1797 - [`Instant::saturating_duration_since`]
1801 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1802 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1803 `--all` is now deprecated.
1807 - [You can now pass `-Clinker` to rustdoc to control the linker used
1808 for compiling doctests.][63834]
1812 - [Code that was previously accepted by the old borrow checker, but rejected by
1813 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1814 previously a warning, and will also become a hard error in the Rust 2015
1815 edition in the 1.40.0 release.
1816 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1817 run tests.][63827] This should improve performance when running a large
1819 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1820 recommended to use the `?` operator instead.
1821 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1824 [62600]: https://github.com/rust-lang/rust/pull/62600/
1825 [62672]: https://github.com/rust-lang/rust/pull/62672/
1826 [63118]: https://github.com/rust-lang/rust/pull/63118/
1827 [63209]: https://github.com/rust-lang/rust/pull/63209/
1828 [63402]: https://github.com/rust-lang/rust/pull/63402/
1829 [63565]: https://github.com/rust-lang/rust/pull/63565/
1830 [63595]: https://github.com/rust-lang/rust/pull/63595/
1831 [63684]: https://github.com/rust-lang/rust/pull/63684/
1832 [63698]: https://github.com/rust-lang/rust/pull/63698/
1833 [63770]: https://github.com/rust-lang/rust/pull/63770/
1834 [63786]: https://github.com/rust-lang/rust/pull/63786/
1835 [63827]: https://github.com/rust-lang/rust/pull/63827/
1836 [63834]: https://github.com/rust-lang/rust/pull/63834/
1837 [63927]: https://github.com/rust-lang/rust/pull/63927/
1838 [63933]: https://github.com/rust-lang/rust/pull/63933/
1839 [63934]: https://github.com/rust-lang/rust/pull/63934/
1840 [63938]: https://github.com/rust-lang/rust/pull/63938/
1841 [63940]: https://github.com/rust-lang/rust/pull/63940/
1842 [63941]: https://github.com/rust-lang/rust/pull/63941/
1843 [63945]: https://github.com/rust-lang/rust/pull/63945/
1844 [64010]: https://github.com/rust-lang/rust/pull/64010/
1845 [64028]: https://github.com/rust-lang/rust/pull/64028/
1846 [64334]: https://github.com/rust-lang/rust/pull/64334/
1847 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1848 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1849 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1850 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1851 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1852 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1854 Version 1.38.0 (2019-09-26)
1855 ==========================
1859 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1860 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1864 - [Added pipelined compilation support to `rustc`.][62766] This will
1865 improve compilation times in some cases. For further information please refer
1866 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1867 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1868 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1869 `x86_64-uwp-windows-msvc` targets.][60260]
1870 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1871 `armv7-unknown-linux-musleabi` targets.][63107]
1872 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1873 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1874 - [Upgraded to LLVM 9.][62592]
1876 \* Refer to Rust's [platform support page][platform-support-doc] for more
1877 information on Rust's tiered platform support.
1881 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1882 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1883 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1884 is available at `std::clone::Clone`). This also makes all built-in macros
1885 available in `std`/`core` root. e.g. `std::include_bytes!`.
1886 - [`str::Chars` now implements `Debug`.][63000]
1887 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1888 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1889 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1890 - [Added euclidean remainder and division operations (`div_euclid`,
1891 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1892 `overflowing`, and `wrapping` versions are available for all
1894 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1895 `PartialEq`.][61491]
1896 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1900 - [`<*const T>::cast`]
1901 - [`<*mut T>::cast`]
1902 - [`Duration::as_secs_f32`]
1903 - [`Duration::as_secs_f64`]
1904 - [`Duration::div_f32`]
1905 - [`Duration::div_f64`]
1906 - [`Duration::from_secs_f32`]
1907 - [`Duration::from_secs_f64`]
1908 - [`Duration::mul_f32`]
1909 - [`Duration::mul_f64`]
1910 - [`any::type_name`]
1914 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1915 - [You can now pass the `--features` option multiple times to enable
1916 multiple features.][cargo/7084]
1921 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
1925 - [`rustc` will now warn about some incorrect uses of
1926 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1930 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1932 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1933 issues][62896] with certain crates such as libc.
1935 [60260]: https://github.com/rust-lang/rust/pull/60260/
1936 [61457]: https://github.com/rust-lang/rust/pull/61457/
1937 [61491]: https://github.com/rust-lang/rust/pull/61491/
1938 [61884]: https://github.com/rust-lang/rust/pull/61884/
1939 [61953]: https://github.com/rust-lang/rust/pull/61953/
1940 [62042]: https://github.com/rust-lang/rust/pull/62042/
1941 [62528]: https://github.com/rust-lang/rust/pull/62528/
1942 [62583]: https://github.com/rust-lang/rust/pull/62583/
1943 [62735]: https://github.com/rust-lang/rust/pull/62735/
1944 [62766]: https://github.com/rust-lang/rust/pull/62766/
1945 [62784]: https://github.com/rust-lang/rust/pull/62784/
1946 [62592]: https://github.com/rust-lang/rust/pull/62592/
1947 [62785]: https://github.com/rust-lang/rust/issues/62785/
1948 [62814]: https://github.com/rust-lang/rust/pull/62814/
1949 [62896]: https://github.com/rust-lang/rust/issues/62896/
1950 [63000]: https://github.com/rust-lang/rust/pull/63000/
1951 [63056]: https://github.com/rust-lang/rust/pull/63056/
1952 [63107]: https://github.com/rust-lang/rust/pull/63107/
1953 [63346]: https://github.com/rust-lang/rust/pull/63346/
1954 [63421]: https://github.com/rust-lang/rust/pull/63421/
1955 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1956 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1957 [63048]: https://github.com/rust-lang/rust/pull/63048
1958 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1959 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1960 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1961 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1962 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1963 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1964 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1965 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1966 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1967 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1968 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1969 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
1970 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1972 Version 1.37.0 (2019-08-15)
1973 ==========================
1977 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1978 [`Box`][62228], or an [array][62235] and unused.
1979 - [You can now use the `cfg` and `cfg_attr` attributes on
1980 generic parameters.][61547]
1981 - [You can now use enum variants through type alias.][61682] e.g. You can
1982 write the following:
1984 type MyOption = Option<u8>;
1986 fn increment_or_zero(x: MyOption) -> u8 {
1988 MyOption::Some(y) => y + 1,
1989 MyOption::None => 0,
1993 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1994 `const _: u32 = 5;`.
1995 - [You can now use `#[repr(align(X)]` on enums.][61229]
1996 - [The `?` Kleene macro operator is now available in the
1997 2015 edition.][60932]
2001 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
2002 and `-C profile-use` flags.][61268] For more information on how to use profile
2003 guided optimization, please refer to the [rustc book][rustc-book-pgo].
2004 - [The `rust-lldb` wrapper script should now work again.][61827]
2008 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
2012 - [`BufReader::buffer`]
2013 - [`BufWriter::buffer`]
2014 - [`Cell::from_mut`]
2015 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2016 - [`DoubleEndedIterator::nth_back`]
2018 - [`Wrapping::reverse_bits`]
2019 - [`i128::reverse_bits`]
2020 - [`i16::reverse_bits`]
2021 - [`i32::reverse_bits`]
2022 - [`i64::reverse_bits`]
2023 - [`i8::reverse_bits`]
2024 - [`isize::reverse_bits`]
2025 - [`slice::copy_within`]
2026 - [`u128::reverse_bits`]
2027 - [`u16::reverse_bits`]
2028 - [`u32::reverse_bits`]
2029 - [`u64::reverse_bits`]
2030 - [`u8::reverse_bits`]
2031 - [`usize::reverse_bits`]
2035 - [`Cargo.lock` files are now included by default when publishing executable crates
2036 with executables.][cargo/7026]
2037 - [You can now specify `default-run="foo"` in `[package]` to specify the
2038 default executable to use for `cargo run`.][cargo/7056]
2045 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2046 Please transition your code to using the `..=` syntax for inclusive
2048 - [Using a trait object without the `dyn` will now warn by default.][61203]
2049 Please transition your code to use `dyn Trait` for trait objects instead.
2051 [62228]: https://github.com/rust-lang/rust/pull/62228/
2052 [62235]: https://github.com/rust-lang/rust/pull/62235/
2053 [61802]: https://github.com/rust-lang/rust/pull/61802/
2054 [61827]: https://github.com/rust-lang/rust/pull/61827/
2055 [61547]: https://github.com/rust-lang/rust/pull/61547/
2056 [61682]: https://github.com/rust-lang/rust/pull/61682/
2057 [61268]: https://github.com/rust-lang/rust/pull/61268/
2058 [61342]: https://github.com/rust-lang/rust/pull/61342/
2059 [61347]: https://github.com/rust-lang/rust/pull/61347/
2060 [61100]: https://github.com/rust-lang/rust/pull/61100/
2061 [61203]: https://github.com/rust-lang/rust/pull/61203/
2062 [61229]: https://github.com/rust-lang/rust/pull/61229/
2063 [60932]: https://github.com/rust-lang/rust/pull/60932/
2064 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2065 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2066 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2067 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2068 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2069 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2070 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2071 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2072 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2073 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2074 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2075 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2076 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2077 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2078 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2079 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2080 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2081 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2082 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2083 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2084 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2085 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2086 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2087 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2090 Version 1.36.0 (2019-07-04)
2091 ==========================
2095 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2096 - [The order of traits in trait objects no longer affects the semantics of that
2097 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2098 `dyn fmt::Debug + Send`, where this was previously not the case.
2102 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2103 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2104 - [`mem::needs_drop` is now available as a const fn.][60364]
2105 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2106 - [`String` now implements `BorrowMut<str>`.][60404]
2107 - [`io::Cursor` now implements `Default`.][60234]
2108 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2109 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2110 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2111 environment has access to heap memory allocation.
2112 - [`String` now implements `From<&String>`.][59825]
2113 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2114 return a tuple of each argument when there is multiple arguments.
2115 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2120 - [`VecDeque::rotate_left`]
2121 - [`VecDeque::rotate_right`]
2122 - [`Iterator::copied`]
2124 - [`io::IoSliceMut`]
2125 - [`Read::read_vectored`]
2126 - [`Write::write_vectored`]
2127 - [`str::as_mut_ptr`]
2128 - [`mem::MaybeUninit`]
2129 - [`pointer::align_offset`]
2130 - [`future::Future`]
2132 - [`task::RawWaker`]
2133 - [`task::RawWakerVTable`]
2139 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2140 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2142 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2146 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2153 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2154 longer recommended, and will be deprecated in 1.39.0.
2156 [60318]: https://github.com/rust-lang/rust/pull/60318/
2157 [60364]: https://github.com/rust-lang/rust/pull/60364/
2158 [60370]: https://github.com/rust-lang/rust/pull/60370/
2159 [60404]: https://github.com/rust-lang/rust/pull/60404/
2160 [60234]: https://github.com/rust-lang/rust/pull/60234/
2161 [60244]: https://github.com/rust-lang/rust/pull/60244/
2162 [58623]: https://github.com/rust-lang/rust/pull/58623/
2163 [59648]: https://github.com/rust-lang/rust/pull/59648/
2164 [59675]: https://github.com/rust-lang/rust/pull/59675/
2165 [59825]: https://github.com/rust-lang/rust/pull/59825/
2166 [59826]: https://github.com/rust-lang/rust/pull/59826/
2167 [59445]: https://github.com/rust-lang/rust/pull/59445/
2168 [59114]: https://github.com/rust-lang/rust/pull/59114/
2169 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2170 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2171 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2172 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2173 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2174 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2175 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2176 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2177 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2178 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2179 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2180 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2181 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2182 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2183 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2184 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2185 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2186 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2187 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2188 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2191 Version 1.35.0 (2019-05-23)
2192 ==========================
2196 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2197 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2198 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2200 unsafe fn call_unsafe(func: unsafe fn()) {
2205 unsafe { call_unsafe(|| {}); }
2212 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2213 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2214 - [Added the `wasm32-unknown-wasi` target.][59464]
2219 - [`Thread` will now show its ID in `Debug` output.][59460]
2220 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2221 - [`alloc::System` now implements `Default`.][59451]
2222 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2224 - [`char::{ToLowercase, ToUppercase}` now
2225 implement `ExactSizeIterator`.][58778]
2226 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2227 - [Removed the `Read` trait bounds
2228 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2229 - [You can now call the `dbg!` macro without any parameters to print the file
2230 and line where it is called.][57847]
2231 - [In place ASCII case conversions are now up to 4× faster.][59283]
2232 e.g. `str::make_ascii_lowercase`
2233 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2240 - [`RefCell::replace_with`]
2241 - [`RefCell::map_split`]
2243 - [`Range::contains`]
2244 - [`RangeFrom::contains`]
2245 - [`RangeTo::contains`]
2246 - [`RangeInclusive::contains`]
2247 - [`RangeToInclusive::contains`]
2248 - [`Option::copied`]
2252 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2253 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2258 - [The Rust toolchain is now available natively for musl based distros.][58575]
2260 [59460]: https://github.com/rust-lang/rust/pull/59460/
2261 [59464]: https://github.com/rust-lang/rust/pull/59464/
2262 [59500]: https://github.com/rust-lang/rust/pull/59500/
2263 [59512]: https://github.com/rust-lang/rust/pull/59512/
2264 [59580]: https://github.com/rust-lang/rust/pull/59580/
2265 [59283]: https://github.com/rust-lang/rust/pull/59283/
2266 [59451]: https://github.com/rust-lang/rust/pull/59451/
2267 [59076]: https://github.com/rust-lang/rust/pull/59076/
2268 [58778]: https://github.com/rust-lang/rust/pull/58778/
2269 [58717]: https://github.com/rust-lang/rust/pull/58717/
2270 [58369]: https://github.com/rust-lang/rust/pull/58369/
2271 [58423]: https://github.com/rust-lang/rust/pull/58423/
2272 [58080]: https://github.com/rust-lang/rust/pull/58080/
2273 [57847]: https://github.com/rust-lang/rust/pull/57847/
2274 [58575]: https://github.com/rust-lang/rust/pull/58575
2275 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2276 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2277 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2278 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2279 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2280 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2281 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2282 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2283 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2284 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2285 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2286 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2288 Version 1.34.2 (2019-05-14)
2289 ===========================
2291 * [Destabilize the `Error::type_id` function due to a security
2292 vulnerability][60785] ([CVE-2019-12083])
2294 [60785]: https://github.com/rust-lang/rust/pull/60785
2295 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2297 Version 1.34.1 (2019-04-25)
2298 ===========================
2300 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2301 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2302 * [Fix Clippy panic when checking some macros][clippy/3805]
2304 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2305 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2306 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2308 Version 1.34.0 (2019-04-11)
2309 ==========================
2313 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2314 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2316 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2317 `#[attr{}]` procedural macros.][57367]
2318 - [You can now write `extern crate self as foo;`][57407] to import your
2319 crate's root into the extern prelude.
2324 - [You can now target `riscv64imac-unknown-none-elf` and
2325 `riscv64gc-unknown-none-elf`.][58406]
2326 - [You can now enable linker plugin LTO optimisations with
2327 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2328 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2330 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2335 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2336 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2337 the `Hash` trait to create an iterator.
2338 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2339 methods.][58421] Most notably you no longer require the `Ord` trait to create
2341 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2342 for all numeric types.][58044]
2343 - [Indexing a `str` is now generic over all types that
2344 implement `SliceIndex<str>`.][57604]
2345 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2346 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2347 produce a warning if their returning type is unused.
2348 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2349 `overflowing_pow` are now available for all numeric types.][57873] These are
2350 equivalent to methods such as `wrapping_add` for the `pow` operation.
2358 * [`Error::type_id`]
2359 * [`atomic::AtomicI16`]
2360 * [`atomic::AtomicI32`]
2361 * [`atomic::AtomicI64`]
2362 * [`atomic::AtomicI8`]
2363 * [`atomic::AtomicU16`]
2364 * [`atomic::AtomicU32`]
2365 * [`atomic::AtomicU64`]
2366 * [`atomic::AtomicU8`]
2367 * [`convert::Infallible`]
2368 * [`convert::TryFrom`]
2369 * [`convert::TryInto`]
2371 * [`iter::successors`]
2372 * [`num::NonZeroI128`]
2373 * [`num::NonZeroI16`]
2374 * [`num::NonZeroI32`]
2375 * [`num::NonZeroI64`]
2376 * [`num::NonZeroI8`]
2377 * [`num::NonZeroIsize`]
2378 * [`slice::sort_by_cached_key`]
2379 * [`str::escape_debug`]
2380 * [`str::escape_default`]
2381 * [`str::escape_unicode`]
2382 * [`str::split_ascii_whitespace`]
2385 * [`Instant::checked_add`]
2386 * [`Instant::checked_sub`]
2387 * [`SystemTime::checked_add`]
2388 * [`SystemTime::checked_sub`]
2392 - [You can now use alternative registries to crates.io.][cargo/6654]
2396 - [You can now use the `?` operator in your documentation tests without manually
2397 adding `fn main() -> Result<(), _> {}`.][56470]
2401 - [`Command::before_exec` is being replaced by the unsafe method
2402 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2403 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2404 can now use `const` functions in `static` variables.
2406 [58370]: https://github.com/rust-lang/rust/pull/58370/
2407 [58406]: https://github.com/rust-lang/rust/pull/58406/
2408 [58421]: https://github.com/rust-lang/rust/pull/58421/
2409 [58166]: https://github.com/rust-lang/rust/pull/58166/
2410 [58044]: https://github.com/rust-lang/rust/pull/58044/
2411 [58057]: https://github.com/rust-lang/rust/pull/58057/
2412 [58059]: https://github.com/rust-lang/rust/pull/58059/
2413 [57809]: https://github.com/rust-lang/rust/pull/57809/
2414 [57873]: https://github.com/rust-lang/rust/pull/57873/
2415 [57604]: https://github.com/rust-lang/rust/pull/57604/
2416 [57367]: https://github.com/rust-lang/rust/pull/57367/
2417 [57407]: https://github.com/rust-lang/rust/pull/57407/
2418 [57425]: https://github.com/rust-lang/rust/pull/57425/
2419 [57106]: https://github.com/rust-lang/rust/pull/57106/
2420 [56470]: https://github.com/rust-lang/rust/pull/56470/
2421 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2422 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2423 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2424 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2425 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2426 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2427 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2428 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2429 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2430 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2431 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2432 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2433 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2434 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2435 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2436 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2437 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2438 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2439 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2440 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2441 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2442 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2443 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2444 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2445 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2446 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2447 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2448 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2449 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2450 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2451 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2454 Version 1.33.0 (2019-02-28)
2455 ==========================
2459 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2460 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2461 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2462 E.g. You can have match statement on a `u8` that covers `0..=255` and
2463 you would no longer be required to have a `_ => unreachable!()` case.
2464 - [You can now have multiple patterns in `if let` and `while let`
2465 expressions.][57532] You can do this with the same syntax as a `match`
2475 let state = Creature::Crab("Ferris");
2477 if let Creature::Crab(name) | Creature::Person(name) = state {
2478 println!("This creature's name is: {}", name);
2482 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2483 this feature will by default produce a warning as this behaviour can be
2484 unintuitive. E.g. `if let _ = 5 {}`
2485 - [You can now use `let` bindings, assignments, expression statements,
2486 and irrefutable pattern destructuring in const functions.][57175]
2487 - [You can now call unsafe const functions.][57067] E.g.
2489 const unsafe fn foo() -> i32 { 5 }
2490 const fn bar() -> i32 {
2494 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2495 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2496 - [You can now specify a specific alignment with the `#[repr(packed)]`
2497 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2498 with an alignment of 2 bytes and a size of 6 bytes.
2499 - [You can now import an item from a module as an `_`.][56303] This allows you to
2500 import a trait's impls, and not have the name in the namespace. E.g.
2502 use std::io::Read as _;
2504 // Allowed as there is only one `Read` in the module.
2507 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2511 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2512 command line argument.][56351]
2513 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2514 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2515 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2516 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2517 information on Rust's platform support.
2518 - [Added support for the `thumbv7neon-linux-androideabi` and
2519 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2520 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2524 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2525 functions for all numeric types.][57566]
2526 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2527 are now `const` functions for all numeric types.][57105]
2528 - [The methods `is_positive` and `is_negative` are now `const` functions for
2529 all signed numeric types.][57105]
2530 - [The `get` method for all `NonZero` types is now `const`.][57167]
2531 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2532 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2533 numeric types.][57234]
2534 - [`Ipv4Addr::new` is now a `const` function][57234]
2538 - [`unix::FileExt::read_exact_at`]
2539 - [`unix::FileExt::write_all_at`]
2540 - [`Option::transpose`]
2541 - [`Result::transpose`]
2542 - [`convert::identity`]
2545 - [`marker::PhantomPinned`]
2546 - [`Vec::resize_with`]
2547 - [`VecDeque::resize_with`]
2548 - [`Duration::as_millis`]
2549 - [`Duration::as_micros`]
2550 - [`Duration::as_nanos`]
2555 - [You can now publish crates that require a feature flag to compile with
2556 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2557 - [Cargo should now rebuild a crate if a file was modified during the initial
2562 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2563 are now deprecated in the standard library, and their usage will now produce a warning.
2564 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2566 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2568 - [Libtest no longer creates a new thread for each test when
2569 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2571 [55982]: https://github.com/rust-lang/rust/pull/55982/
2572 [56243]: https://github.com/rust-lang/rust/pull/56243
2573 [56303]: https://github.com/rust-lang/rust/pull/56303/
2574 [56351]: https://github.com/rust-lang/rust/pull/56351/
2575 [56362]: https://github.com/rust-lang/rust/pull/56362
2576 [56642]: https://github.com/rust-lang/rust/pull/56642/
2577 [56769]: https://github.com/rust-lang/rust/pull/56769/
2578 [56805]: https://github.com/rust-lang/rust/pull/56805
2579 [56947]: https://github.com/rust-lang/rust/pull/56947/
2580 [57049]: https://github.com/rust-lang/rust/pull/57049/
2581 [57067]: https://github.com/rust-lang/rust/pull/57067/
2582 [57105]: https://github.com/rust-lang/rust/pull/57105
2583 [57130]: https://github.com/rust-lang/rust/pull/57130/
2584 [57167]: https://github.com/rust-lang/rust/pull/57167/
2585 [57175]: https://github.com/rust-lang/rust/pull/57175/
2586 [57234]: https://github.com/rust-lang/rust/pull/57234/
2587 [57332]: https://github.com/rust-lang/rust/pull/57332/
2588 [57465]: https://github.com/rust-lang/rust/pull/57465/
2589 [57532]: https://github.com/rust-lang/rust/pull/57532/
2590 [57535]: https://github.com/rust-lang/rust/pull/57535/
2591 [57566]: https://github.com/rust-lang/rust/pull/57566/
2592 [57615]: https://github.com/rust-lang/rust/pull/57615/
2593 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2594 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2595 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2596 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2597 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2598 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2599 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2600 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2601 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2602 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2603 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2604 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2605 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2606 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2607 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2608 [platform-support]: https://forge.rust-lang.org/platform-support.html
2610 Version 1.32.0 (2019-01-17)
2611 ==========================
2616 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2617 operator allows you to specify zero or one repetitions similar to the `*` and
2619 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2620 now always resolve to the item (`enum`, `struct`, etc.) available in the
2621 module if present, before resolving to a external crate or an item the prelude.][56759]
2624 enum Color { Red, Green, Blue }
2630 - [You can now match against `PhantomData<T>` types.][55837]
2631 - [You can now match against literals in macros with the `literal`
2632 specifier.][56072] This will match against a literal of any type.
2633 E.g. `1`, `'A'`, `"Hello World"`
2634 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2636 struct Point(i32, i32);
2639 pub fn new(x: i32, y: i32) -> Self {
2643 pub fn is_origin(&self) -> bool {
2651 - [Self can also now be used in type definitions.][56366] E.g.
2655 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2658 Cons(T, Box<Self>) // likewise here
2661 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2662 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2666 - [The default allocator has changed from jemalloc to the default allocator on
2667 your system.][55238] The compiler itself on Linux & macOS will still use
2668 jemalloc, but programs compiled with it will use the system allocator.
2669 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2673 - [`PathBuf` now implements `FromStr`.][55148]
2674 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2675 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2676 easily debug expressions in your rust program. E.g.
2679 let b = dbg!(a * 2) + 1;
2680 // ^-- prints: [src/main.rs:4] a * 2 = 4
2684 The following APIs are now `const` functions and can be used in a
2688 - [`UnsafeCell::get`]
2689 - [`char::is_ascii`]
2691 - [`ManuallyDrop::new`]
2692 - [`ManuallyDrop::into_inner`]
2693 - [`RangeInclusive::start`]
2694 - [`RangeInclusive::end`]
2695 - [`NonNull::as_ptr`]
2698 - [`Duration::as_secs`]
2699 - [`Duration::subsec_millis`]
2700 - [`Duration::subsec_micros`]
2701 - [`Duration::subsec_nanos`]
2703 - [`Ipv4Addr::is_unspecified`]
2705 - [`Ipv6Addr::octets`]
2709 - [`i8::to_be_bytes`]
2710 - [`i8::to_le_bytes`]
2711 - [`i8::to_ne_bytes`]
2712 - [`i8::from_be_bytes`]
2713 - [`i8::from_le_bytes`]
2714 - [`i8::from_ne_bytes`]
2715 - [`i16::to_be_bytes`]
2716 - [`i16::to_le_bytes`]
2717 - [`i16::to_ne_bytes`]
2718 - [`i16::from_be_bytes`]
2719 - [`i16::from_le_bytes`]
2720 - [`i16::from_ne_bytes`]
2721 - [`i32::to_be_bytes`]
2722 - [`i32::to_le_bytes`]
2723 - [`i32::to_ne_bytes`]
2724 - [`i32::from_be_bytes`]
2725 - [`i32::from_le_bytes`]
2726 - [`i32::from_ne_bytes`]
2727 - [`i64::to_be_bytes`]
2728 - [`i64::to_le_bytes`]
2729 - [`i64::to_ne_bytes`]
2730 - [`i64::from_be_bytes`]
2731 - [`i64::from_le_bytes`]
2732 - [`i64::from_ne_bytes`]
2733 - [`i128::to_be_bytes`]
2734 - [`i128::to_le_bytes`]
2735 - [`i128::to_ne_bytes`]
2736 - [`i128::from_be_bytes`]
2737 - [`i128::from_le_bytes`]
2738 - [`i128::from_ne_bytes`]
2739 - [`isize::to_be_bytes`]
2740 - [`isize::to_le_bytes`]
2741 - [`isize::to_ne_bytes`]
2742 - [`isize::from_be_bytes`]
2743 - [`isize::from_le_bytes`]
2744 - [`isize::from_ne_bytes`]
2745 - [`u8::to_be_bytes`]
2746 - [`u8::to_le_bytes`]
2747 - [`u8::to_ne_bytes`]
2748 - [`u8::from_be_bytes`]
2749 - [`u8::from_le_bytes`]
2750 - [`u8::from_ne_bytes`]
2751 - [`u16::to_be_bytes`]
2752 - [`u16::to_le_bytes`]
2753 - [`u16::to_ne_bytes`]
2754 - [`u16::from_be_bytes`]
2755 - [`u16::from_le_bytes`]
2756 - [`u16::from_ne_bytes`]
2757 - [`u32::to_be_bytes`]
2758 - [`u32::to_le_bytes`]
2759 - [`u32::to_ne_bytes`]
2760 - [`u32::from_be_bytes`]
2761 - [`u32::from_le_bytes`]
2762 - [`u32::from_ne_bytes`]
2763 - [`u64::to_be_bytes`]
2764 - [`u64::to_le_bytes`]
2765 - [`u64::to_ne_bytes`]
2766 - [`u64::from_be_bytes`]
2767 - [`u64::from_le_bytes`]
2768 - [`u64::from_ne_bytes`]
2769 - [`u128::to_be_bytes`]
2770 - [`u128::to_le_bytes`]
2771 - [`u128::to_ne_bytes`]
2772 - [`u128::from_be_bytes`]
2773 - [`u128::from_le_bytes`]
2774 - [`u128::from_ne_bytes`]
2775 - [`usize::to_be_bytes`]
2776 - [`usize::to_le_bytes`]
2777 - [`usize::to_ne_bytes`]
2778 - [`usize::from_be_bytes`]
2779 - [`usize::from_le_bytes`]
2780 - [`usize::from_ne_bytes`]
2784 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2785 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2789 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2793 - [The argument types for AVX's
2794 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2795 been changed from `*const` to `*mut` as the previous implementation
2799 [55148]: https://github.com/rust-lang/rust/pull/55148/
2800 [55238]: https://github.com/rust-lang/rust/pull/55238/
2801 [55280]: https://github.com/rust-lang/rust/pull/55280/
2802 [55610]: https://github.com/rust-lang/rust/pull/55610/
2803 [55663]: https://github.com/rust-lang/rust/pull/55663/
2804 [55702]: https://github.com/rust-lang/rust/pull/55702/
2805 [55837]: https://github.com/rust-lang/rust/pull/55837/
2806 [55843]: https://github.com/rust-lang/rust/pull/55843/
2807 [56072]: https://github.com/rust-lang/rust/pull/56072/
2808 [56245]: https://github.com/rust-lang/rust/pull/56245/
2809 [56365]: https://github.com/rust-lang/rust/pull/56365/
2810 [56366]: https://github.com/rust-lang/rust/pull/56366/
2811 [56395]: https://github.com/rust-lang/rust/pull/56395/
2812 [56759]: https://github.com/rust-lang/rust/pull/56759/
2813 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2814 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2815 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2816 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2817 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2818 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2819 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2820 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2821 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2822 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2823 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2824 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2825 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2826 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2827 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2828 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2829 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2830 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2831 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2832 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2833 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2834 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2835 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2836 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2837 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2838 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2839 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2840 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2841 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2842 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2843 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2844 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2845 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2846 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2847 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2848 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2849 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2850 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2851 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2852 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2853 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2854 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2855 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2856 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2857 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2858 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2859 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2860 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2861 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2862 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2863 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2864 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2865 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2866 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2867 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2868 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2869 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2870 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2871 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2872 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2873 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2874 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2875 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2876 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2877 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2878 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2879 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2880 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2881 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2882 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2883 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2884 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2885 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2886 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2887 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2888 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2889 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2890 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2891 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2892 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2893 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2894 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2895 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2896 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2897 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2898 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2899 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2900 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2901 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2902 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2903 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2904 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2905 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2908 Version 1.31.1 (2018-12-20)
2909 ===========================
2911 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2912 - [Fix broken go-to-definition in RLS][rls/1171]
2913 - [Fix infinite loop on hover in RLS][rls/1170]
2915 [56562]: https://github.com/rust-lang/rust/pull/56562
2916 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2917 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2919 Version 1.31.0 (2018-12-06)
2920 ==========================
2924 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2925 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2926 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2927 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2929 - [You can now define and use `const` functions.][54835] These are currently
2930 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2931 [language reference][const-reference] for what exactly is available.
2932 - [You can now use tool lints, which allow you to scope lints from external
2933 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2934 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2935 a crate, not just in exported functions.][54451]
2936 - [You can now use parentheses in pattern matches.][54497]
2940 - [Updated musl to 1.1.20][54430]
2944 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2945 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2946 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2947 into `Option<&mut T>` using the `From` trait.][53218]
2948 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2953 - [`slice::align_to`]
2954 - [`slice::align_to_mut`]
2955 - [`slice::chunks_exact`]
2956 - [`slice::chunks_exact_mut`]
2957 - [`slice::rchunks`]
2958 - [`slice::rchunks_mut`]
2959 - [`slice::rchunks_exact`]
2960 - [`slice::rchunks_exact_mut`]
2961 - [`Option::replace`]
2965 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2966 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2967 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2969 [52813]: https://github.com/rust-lang/rust/pull/52813/
2970 [53218]: https://github.com/rust-lang/rust/pull/53218/
2971 [53555]: https://github.com/rust-lang/rust/issues/53555/
2972 [54057]: https://github.com/rust-lang/rust/pull/54057/
2973 [54240]: https://github.com/rust-lang/rust/pull/54240/
2974 [54430]: https://github.com/rust-lang/rust/pull/54430/
2975 [54451]: https://github.com/rust-lang/rust/pull/54451/
2976 [54497]: https://github.com/rust-lang/rust/pull/54497/
2977 [54778]: https://github.com/rust-lang/rust/pull/54778/
2978 [54835]: https://github.com/rust-lang/rust/pull/54835/
2979 [54870]: https://github.com/rust-lang/rust/pull/54870/
2980 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2981 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2982 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2983 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2984 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2985 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2986 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2987 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2988 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2989 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2990 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2991 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2992 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2993 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2995 Version 1.30.1 (2018-11-08)
2996 ===========================
2998 - [Fixed overflow ICE in rustdoc][54199]
2999 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
3001 [54199]: https://github.com/rust-lang/rust/pull/54199
3002 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
3004 Version 1.30.0 (2018-10-25)
3005 ==========================
3009 - [Procedural macros are now available.][52081] These kinds of macros allow for
3010 more powerful code generation. There is a [new chapter available][proc-macros]
3011 in the Rust Programming Language book that goes further in depth.
3012 - [You can now use keywords as identifiers using the raw identifiers
3013 syntax (`r#`),][53236] e.g. `let r#for = true;`
3014 - [Using anonymous parameters in traits is now deprecated with a warning and
3015 will be a hard error in the 2018 edition.][53272]
3016 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3017 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3018 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3019 Previously, using a external crate in a module without a use statement
3020 required `let json = ::serde_json::from_str(foo);` but can now be written
3021 as `let json = serde_json::from_str(foo);`.
3022 - [You can now apply the `#[used]` attribute to static items to prevent the
3023 compiler from optimising them away, even if they appear to be unused,][51363]
3024 e.g. `#[used] static FOO: u32 = 1;`
3025 - [You can now import and reexport macros from other crates with the `use`
3026 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3027 the root module of the crate. If your macro relies on calling other local
3028 macros, it is recommended to export with the
3029 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3031 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3032 using the `vis` specifier.][53370]
3033 - [Non-macro attributes now allow all forms of literals, not just
3034 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3035 write `#[attr(true)]`.
3036 - [You can now specify a function to handle a panic in the Rust runtime with the
3037 `#[panic_handler]` attribute.][51366]
3041 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3042 - [Added the `aarch64-unknown-netbsd` target][53165]
3043 - [Upgraded to LLVM 8.][53611]
3047 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3051 - [`Ipv4Addr::BROADCAST`]
3052 - [`Ipv4Addr::LOCALHOST`]
3053 - [`Ipv4Addr::UNSPECIFIED`]
3054 - [`Ipv6Addr::LOCALHOST`]
3055 - [`Ipv6Addr::UNSPECIFIED`]
3056 - [`Iterator::find_map`]
3058 The following methods are replacement methods for `trim_left`, `trim_right`,
3059 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3061 - [`str::trim_end_matches`]
3063 - [`str::trim_start_matches`]
3064 - [`str::trim_start`]
3068 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3069 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3070 equivalent to calling `rustdoc --error-format=json`.
3071 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3075 - [`rustdoc` allows you to specify what edition to treat your code as with the
3076 `--edition` option.][54057]
3077 - [`rustdoc` now has the `--color` (specify whether to output color) and
3078 `--error-format` (specify error format, e.g. `json`) options.][53003]
3079 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3080 debug symbols.][53774]
3081 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3082 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3084 [50911]: https://github.com/rust-lang/rust/pull/50911/
3085 [51363]: https://github.com/rust-lang/rust/pull/51363/
3086 [51366]: https://github.com/rust-lang/rust/pull/51366/
3087 [52081]: https://github.com/rust-lang/rust/pull/52081/
3088 [53003]: https://github.com/rust-lang/rust/pull/53003/
3089 [53033]: https://github.com/rust-lang/rust/pull/53033/
3090 [53044]: https://github.com/rust-lang/rust/pull/53044/
3091 [53165]: https://github.com/rust-lang/rust/pull/53165/
3092 [53611]: https://github.com/rust-lang/rust/pull/53611/
3093 [53213]: https://github.com/rust-lang/rust/pull/53213/
3094 [53236]: https://github.com/rust-lang/rust/pull/53236/
3095 [53272]: https://github.com/rust-lang/rust/pull/53272/
3096 [53370]: https://github.com/rust-lang/rust/pull/53370/
3097 [53459]: https://github.com/rust-lang/rust/pull/53459/
3098 [53774]: https://github.com/rust-lang/rust/pull/53774/
3099 [53822]: https://github.com/rust-lang/rust/pull/53822/
3100 [54057]: https://github.com/rust-lang/rust/pull/54057/
3101 [54146]: https://github.com/rust-lang/rust/pull/54146/
3102 [54404]: https://github.com/rust-lang/rust/pull/54404/
3103 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3104 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3105 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3106 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3108 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3109 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3110 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3111 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3112 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3113 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3114 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3115 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3116 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3117 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3120 Version 1.29.2 (2018-10-11)
3121 ===========================
3123 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3124 - The `rls-preview` component on the windows-gnu targets has been restored.
3126 [54639]: https://github.com/rust-lang/rust/pull/54639
3129 Version 1.29.1 (2018-09-25)
3130 ===========================
3135 - The standard library's `str::repeat` function contained an out of bounds write
3136 caused by an integer overflow. This has been fixed by deterministically
3137 panicking when an overflow happens.
3139 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3143 Version 1.29.0 (2018-09-13)
3144 ==========================
3148 - [Bumped minimum LLVM version to 5.0.][51899]
3149 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3150 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3151 - [Upgraded to LLVM 7.][51966]
3155 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3156 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3157 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3158 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3160 - [`Cell<T>` now allows `T` to be unsized.][50494]
3161 - [`SocketAddr` is now stable on Redox.][52656]
3166 - [`Iterator::flatten`]
3171 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3172 `--locked` to disable this behavior.
3173 - [`cargo-install` will now allow you to cross compile an install
3174 using `--target`.][cargo/5614]
3175 - [Added the `cargo-fix` subcommand to automatically move project code from
3176 2015 edition to 2018.][cargo/5723]
3177 - [`cargo doc` can now optionally document private types using the
3178 `--document-private-items` flag.][cargo/5543]
3182 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3183 the specified level to that level.][52354] For example `--cap-lints warn`
3184 will demote `deny` and `forbid` lints to `warn`.
3185 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3186 fails and `101` if there is a panic.][52197]
3187 - [A preview of clippy has been made available through rustup.][51122]
3188 You can install the preview with `rustup component add clippy-preview`.
3192 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3193 Use `str::get_unchecked(begin..end)` instead.
3194 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3195 Consider using the `home_dir` function from
3196 https://crates.io/crates/dirs instead.
3197 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3198 - [`cfg` attributes and `--cfg` command line flags are now more
3199 strictly validated.][53893]
3201 [53893]: https://github.com/rust-lang/rust/pull/53893/
3202 [52861]: https://github.com/rust-lang/rust/pull/52861/
3203 [51966]: https://github.com/rust-lang/rust/pull/51966/
3204 [52656]: https://github.com/rust-lang/rust/pull/52656/
3205 [52239]: https://github.com/rust-lang/rust/pull/52239/
3206 [52330]: https://github.com/rust-lang/rust/pull/52330/
3207 [52354]: https://github.com/rust-lang/rust/pull/52354/
3208 [52402]: https://github.com/rust-lang/rust/pull/52402/
3209 [52103]: https://github.com/rust-lang/rust/pull/52103/
3210 [52197]: https://github.com/rust-lang/rust/pull/52197/
3211 [51807]: https://github.com/rust-lang/rust/pull/51807/
3212 [51899]: https://github.com/rust-lang/rust/pull/51899/
3213 [51912]: https://github.com/rust-lang/rust/pull/51912/
3214 [51511]: https://github.com/rust-lang/rust/pull/51511/
3215 [51619]: https://github.com/rust-lang/rust/pull/51619/
3216 [51656]: https://github.com/rust-lang/rust/pull/51656/
3217 [51178]: https://github.com/rust-lang/rust/pull/51178/
3218 [51122]: https://github.com/rust-lang/rust/pull/51122
3219 [50494]: https://github.com/rust-lang/rust/pull/50494/
3220 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3221 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3222 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3223 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3224 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3225 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3226 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3229 Version 1.28.0 (2018-08-02)
3230 ===========================
3234 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3235 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3236 the inner type across Foreign Function Interface (FFI) boundaries.
3237 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3238 and can now be used as identifiers.][51196]
3239 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3240 stable.][51241] This will allow users to specify a global allocator for
3242 - [Unit test functions marked with the `#[test]` attribute can now return
3243 `Result<(), E: Debug>` in addition to `()`.][51298]
3244 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3245 allows macros to easily target lifetimes.
3249 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3250 prioritise making smaller binary sizes. `z` is the same as `s` with the
3251 exception that it does not vectorise loops, which typically results in an even
3253 - [The short error format is now stable.][49546] Specified with
3254 `--error-format=short` this option will provide a more compressed output of
3255 rust error messages.
3256 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3257 - [Reduced the number of allocations in the macro parser.][50855] This can
3258 improve compile times of macro heavy crates on average by 5%.
3262 - [Implemented `Default` for `&mut str`.][51306]
3263 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3264 - [Implemented `Extend` for `()`.][50234]
3265 - [The `Debug` implementation of `time::Duration` should now be more easily
3266 human readable.][50364] Previously a `Duration` of one second would printed as
3267 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3268 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3269 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3270 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3271 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3272 for `PathBuf`.][50170]
3273 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3274 and `Wrapping<i128>`.][50465]
3275 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3276 possible.][51050] This can provide up to a 40% speed increase.
3277 - [Improved error messages when using `format!`.][50610]
3281 - [`Iterator::step_by`]
3282 - [`Path::ancestors`]
3283 - [`SystemTime::UNIX_EPOCH`]
3284 - [`alloc::GlobalAlloc`]
3286 - [`alloc::LayoutErr`]
3289 - [`alloc::alloc_zeroed`]
3290 - [`alloc::dealloc`]
3291 - [`alloc::realloc`]
3292 - [`alloc::handle_alloc_error`]
3293 - [`btree_map::Entry::or_default`]
3294 - [`fmt::Alignment`]
3295 - [`hash_map::Entry::or_default`]
3296 - [`iter::repeat_with`]
3297 - [`num::NonZeroUsize`]
3298 - [`num::NonZeroU128`]
3299 - [`num::NonZeroU16`]
3300 - [`num::NonZeroU32`]
3301 - [`num::NonZeroU64`]
3302 - [`num::NonZeroU8`]
3303 - [`ops::RangeBounds`]
3304 - [`slice::SliceIndex`]
3305 - [`slice::from_mut`]
3306 - [`slice::from_ref`]
3307 - [`{Any + Send + Sync}::downcast_mut`]
3308 - [`{Any + Send + Sync}::downcast_ref`]
3309 - [`{Any + Send + Sync}::is`]
3313 - [Cargo will now no longer allow you to publish crates with build scripts that
3314 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3315 considered to be immutable.
3319 - [The `suggestion_applicability` field in `rustc`'s json output is now
3320 stable.][50486] This will allow dev tools to check whether a code suggestion
3321 would apply to them.
3325 - [Rust will consider trait objects with duplicated constraints to be the same
3326 type as without the duplicated constraint.][51276] For example the below code will
3327 now fail to compile.
3332 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3335 impl Trait + Send + Send {
3336 fn test(&self) { println!("two"); }
3340 [49546]: https://github.com/rust-lang/rust/pull/49546/
3341 [50143]: https://github.com/rust-lang/rust/pull/50143/
3342 [50170]: https://github.com/rust-lang/rust/pull/50170/
3343 [50234]: https://github.com/rust-lang/rust/pull/50234/
3344 [50265]: https://github.com/rust-lang/rust/pull/50265/
3345 [50364]: https://github.com/rust-lang/rust/pull/50364/
3346 [50385]: https://github.com/rust-lang/rust/pull/50385/
3347 [50465]: https://github.com/rust-lang/rust/pull/50465/
3348 [50486]: https://github.com/rust-lang/rust/pull/50486/
3349 [50554]: https://github.com/rust-lang/rust/pull/50554/
3350 [50610]: https://github.com/rust-lang/rust/pull/50610/
3351 [50855]: https://github.com/rust-lang/rust/pull/50855/
3352 [51050]: https://github.com/rust-lang/rust/pull/51050/
3353 [51196]: https://github.com/rust-lang/rust/pull/51196/
3354 [51200]: https://github.com/rust-lang/rust/pull/51200/
3355 [51241]: https://github.com/rust-lang/rust/pull/51241/
3356 [51276]: https://github.com/rust-lang/rust/pull/51276/
3357 [51298]: https://github.com/rust-lang/rust/pull/51298/
3358 [51306]: https://github.com/rust-lang/rust/pull/51306/
3359 [51562]: https://github.com/rust-lang/rust/pull/51562/
3360 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3361 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3362 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3363 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3364 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3365 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3366 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3367 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3368 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3369 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3370 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3371 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3372 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3373 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3374 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3375 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3376 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3377 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3378 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3379 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3380 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3381 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3382 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3383 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3384 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3385 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3386 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3387 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3388 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3389 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3391 Version 1.27.2 (2018-07-20)
3392 ===========================
3397 - The borrow checker was fixed to avoid potential unsoundness when using
3398 match ergonomics: [#52213][52213].
3400 [52213]: https://github.com/rust-lang/rust/issues/52213
3402 Version 1.27.1 (2018-07-10)
3403 ===========================
3408 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3409 when running, which enabled executing code as some other user on a
3410 given machine. This release fixes that vulnerability; you can read
3411 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3413 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3418 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3419 match ergonomics: [#51415][51415], [#49534][49534].
3421 [51415]: https://github.com/rust-lang/rust/issues/51415
3422 [49534]: https://github.com/rust-lang/rust/issues/49534
3423 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3424 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3426 Version 1.27.0 (2018-06-21)
3427 ==========================
3431 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3432 be used as an identifier.
3433 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3434 bare `Trait` syntax, and should make it clearer when being used in tandem with
3435 `impl Trait` because it is equivalent to the following syntax:
3436 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3437 `Box<Trait> == Box<dyn Trait>`.
3438 - [Attributes on generic parameters such as types and lifetimes are
3439 now stable.][48851] e.g.
3440 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3441 - [The `#[must_use]` attribute can now also be used on functions as well as
3442 types.][48925] It provides a lint that by default warns users when the
3443 value returned by a function has not been used.
3447 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3451 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3452 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3453 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3454 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3455 the `cfg` attribute.
3456 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3457 std are now available in core.][49896]
3458 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3460 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3461 that the operation isn't done in place.
3462 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3463 the `#[must_use]` attribute][49533] to warn about unused potentially
3464 expensive allocations.
3468 - [`DoubleEndedIterator::rfind`]
3469 - [`DoubleEndedIterator::rfold`]
3470 - [`DoubleEndedIterator::try_rfold`]
3471 - [`Duration::from_micros`]
3472 - [`Duration::from_nanos`]
3473 - [`Duration::subsec_micros`]
3474 - [`Duration::subsec_millis`]
3475 - [`HashMap::remove_entry`]
3476 - [`Iterator::try_fold`]
3477 - [`Iterator::try_for_each`]
3479 - [`Option::filter`]
3480 - [`String::replace_range`]
3481 - [`Take::set_limit`]
3482 - [`hint::unreachable_unchecked`]
3483 - [`os::unix::process::parent_id`]
3484 - [`ptr::swap_nonoverlapping`]
3485 - [`slice::rsplit_mut`]
3487 - [`slice::swap_with_slice`]
3491 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3492 `readme`, and `repository` fields.][cargo/5386]
3493 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3494 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3495 a different directory than `target` for placing compilation artifacts.
3496 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3497 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3498 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3499 where cargo would infer a binary, Cargo will produce a warning. You can
3500 disable this feature ahead of time by setting any of the following to false:
3501 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3502 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3503 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3507 - [Added “The Rustc book” into the official documentation.][49707]
3508 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3509 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3513 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3514 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3515 compile, `"".is_empty()` will still compile.
3516 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3517 will only print the inner type.][48553] E.g.
3518 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3519 not `AtomicBool(true)`.
3520 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3521 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3522 alignment should cover all use cases.
3523 - The `.description()` method on the `std::error::Error` trait
3524 [has been soft-deprecated][50163]. It is no longer required to implement it.
3526 [48553]: https://github.com/rust-lang/rust/pull/48553/
3527 [48851]: https://github.com/rust-lang/rust/pull/48851/
3528 [48925]: https://github.com/rust-lang/rust/pull/48925/
3529 [49533]: https://github.com/rust-lang/rust/pull/49533/
3530 [49623]: https://github.com/rust-lang/rust/pull/49623/
3531 [49630]: https://github.com/rust-lang/rust/pull/49630/
3532 [49664]: https://github.com/rust-lang/rust/pull/49664/
3533 [49699]: https://github.com/rust-lang/rust/pull/49699/
3534 [49707]: https://github.com/rust-lang/rust/pull/49707/
3535 [49719]: https://github.com/rust-lang/rust/pull/49719/
3536 [49896]: https://github.com/rust-lang/rust/pull/49896/
3537 [49968]: https://github.com/rust-lang/rust/pull/49968/
3538 [50163]: https://github.com/rust-lang/rust/pull/50163
3539 [50177]: https://github.com/rust-lang/rust/pull/50177/
3540 [50378]: https://github.com/rust-lang/rust/pull/50378/
3541 [50398]: https://github.com/rust-lang/rust/pull/50398/
3542 [50423]: https://github.com/rust-lang/rust/pull/50423/
3543 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3544 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3545 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3546 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3547 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3548 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3549 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3550 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3551 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3552 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3553 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3554 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3555 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3556 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3557 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3558 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3559 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3560 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3561 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3562 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3563 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3564 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3565 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3566 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3567 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3568 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3569 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3570 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3571 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3572 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3575 Version 1.26.2 (2018-06-05)
3576 ==========================
3581 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3583 [51117]: https://github.com/rust-lang/rust/issues/51117
3586 Version 1.26.1 (2018-05-29)
3587 ==========================
3592 - [RLS now works on Windows.][50646]
3593 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3599 - [`fn main() -> impl Trait` no longer works for non-Termination
3601 This reverts an accidental stabilization.
3602 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3603 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3605 [50646]: https://github.com/rust-lang/rust/issues/50646
3606 [50656]: https://github.com/rust-lang/rust/pull/50656
3607 [50812]: https://github.com/rust-lang/rust/pull/50812
3608 [50950]: https://github.com/rust-lang/rust/issues/50950
3609 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3611 Version 1.26.0 (2018-05-10)
3612 ==========================
3616 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3617 implement either or both traits.][49299]
3618 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3619 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3620 lifetime can be elided.][49458]
3621 - [`impl Trait` is now stable allowing you to have abstract types in returns
3622 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3623 `fn open(path: impl AsRef<Path>)`.
3624 - [Pattern matching will now automatically apply dereferences.][49394]
3625 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3626 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3627 - [A lot of operations are now available in a const context.][46882] E.g. You
3628 can now index into constant arrays, reference and dereference into constants,
3629 and use tuple struct constructors.
3630 - [Fixed entry slice patterns are now stable.][48516] E.g.
3632 let points = [1, 2, 3, 4];
3634 [1, 2, 3, 4] => println!("All points were sequential."),
3635 _ => println!("Not all points were sequential."),
3642 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3643 - [Fixed exponential projection complexity on nested types.][48296]
3644 This can provide up to a ~12% reduction in compile times for certain crates.
3645 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3646 to remap path prefixes outputted by the compiler.
3647 - [Added `powerpc-unknown-netbsd` target.][48281]
3651 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3652 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3653 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3654 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3655 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3656 - [`ascii::escape_default` is now available in libcore.][48735]
3657 - [Trailing commas are now supported in std and core macros.][48056]
3658 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3659 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3664 - [`*const T::copy_to_nonoverlapping`]
3665 - [`*const T::copy_to`]
3666 - [`*const T::read_unaligned`]
3667 - [`*const T::read_volatile`]
3668 - [`*const T::read`]
3670 - [`*const T::wrapping_add`]
3671 - [`*const T::wrapping_sub`]
3673 - [`*mut T::copy_to_nonoverlapping`]
3674 - [`*mut T::copy_to`]
3675 - [`*mut T::read_unaligned`]
3676 - [`*mut T::read_volatile`]
3678 - [`*mut T::replace`]
3681 - [`*mut T::wrapping_add`]
3682 - [`*mut T::wrapping_sub`]
3683 - [`*mut T::write_bytes`]
3684 - [`*mut T::write_unaligned`]
3685 - [`*mut T::write_volatile`]
3688 - [`FromUtf8Error::as_bytes`]
3689 - [`LocalKey::try_with`]
3690 - [`Option::cloned`]
3691 - [`btree_map::Entry::and_modify`]
3692 - [`fs::read_to_string`]
3695 - [`hash_map::Entry::and_modify`]
3696 - [`iter::FusedIterator`]
3697 - [`ops::RangeInclusive`]
3698 - [`ops::RangeToInclusive`]
3700 - [`slice::rotate_left`]
3701 - [`slice::rotate_right`]
3702 - [`String::retain`]
3707 - [Cargo will now output path to custom commands when `-v` is
3708 passed with `--list`][cargo/5041]
3709 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3713 - [The second edition of "The Rust Programming Language" book is now recommended
3714 over the first.][48404]
3719 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3720 syntax is now invalid.
3722 use std::ops::Fn as dyn;
3723 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3725 - [The result of dereferences are no longer promoted to `'static`.][47408]
3729 const PAIR: &(i32, i32) = &(0, 1);
3730 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3733 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3734 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3736 - [Removed hoedown from rustdoc.][48274]
3737 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3739 [46882]: https://github.com/rust-lang/rust/pull/46882
3740 [47379]: https://github.com/rust-lang/rust/pull/47379
3741 [47408]: https://github.com/rust-lang/rust/pull/47408
3742 [47813]: https://github.com/rust-lang/rust/pull/47813
3743 [48056]: https://github.com/rust-lang/rust/pull/48056
3744 [48125]: https://github.com/rust-lang/rust/pull/48125
3745 [48166]: https://github.com/rust-lang/rust/pull/48166
3746 [48235]: https://github.com/rust-lang/rust/pull/48235
3747 [48274]: https://github.com/rust-lang/rust/pull/48274
3748 [48281]: https://github.com/rust-lang/rust/pull/48281
3749 [48296]: https://github.com/rust-lang/rust/pull/48296
3750 [48326]: https://github.com/rust-lang/rust/pull/48326
3751 [48359]: https://github.com/rust-lang/rust/pull/48359
3752 [48404]: https://github.com/rust-lang/rust/pull/48404
3753 [48481]: https://github.com/rust-lang/rust/pull/48481
3754 [48516]: https://github.com/rust-lang/rust/pull/48516
3755 [48628]: https://github.com/rust-lang/rust/pull/48628
3756 [48629]: https://github.com/rust-lang/rust/pull/48629
3757 [48657]: https://github.com/rust-lang/rust/pull/48657
3758 [48735]: https://github.com/rust-lang/rust/pull/48735
3759 [48978]: https://github.com/rust-lang/rust/pull/48978
3760 [49101]: https://github.com/rust-lang/rust/pull/49101
3761 [49109]: https://github.com/rust-lang/rust/pull/49109
3762 [49121]: https://github.com/rust-lang/rust/pull/49121
3763 [49162]: https://github.com/rust-lang/rust/pull/49162
3764 [49184]: https://github.com/rust-lang/rust/pull/49184
3765 [49234]: https://github.com/rust-lang/rust/pull/49234
3766 [49255]: https://github.com/rust-lang/rust/pull/49255
3767 [49299]: https://github.com/rust-lang/rust/pull/49299
3768 [49305]: https://github.com/rust-lang/rust/pull/49305
3769 [49394]: https://github.com/rust-lang/rust/pull/49394
3770 [49458]: https://github.com/rust-lang/rust/pull/49458
3771 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3772 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3773 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3774 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3775 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3776 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3777 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3778 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3779 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3780 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3781 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3782 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3783 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3784 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3785 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3786 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3787 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3788 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3789 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3790 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3791 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3792 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3793 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3794 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3795 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3796 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3797 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3798 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3799 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3800 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3801 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3802 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3803 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3804 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3805 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3806 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3807 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3808 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3809 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3810 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3811 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3812 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3815 Version 1.25.0 (2018-03-29)
3816 ==========================
3820 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3821 - [You can now use nested groups of imports.][47948]
3822 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3823 - [You can now have `|` at the start of a match arm.][47947] e.g.
3825 enum Foo { A, B, C }
3831 | Foo::B => println!("AB"),
3832 | Foo::C => println!("C"),
3839 - [Upgraded to LLVM 6.][47828]
3840 - [Added `-C lto=val` option.][47521]
3841 - [Added `i586-unknown-linux-musl` target][47282]
3845 - [Impl Send for `process::Command` on Unix.][47760]
3846 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3847 - [`UnsafeCell::into_inner` is now safe.][47204]
3848 - [Implement libstd for CloudABI.][47268]
3849 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3850 - [Implement `AsRef<Path>` for Component][46985]
3851 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3852 - [Moved `Duration` to libcore.][46666]
3856 - [`Location::column`]
3859 The following functions can now be used in a constant expression.
3860 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3861 - [`Duration::new`][47300]
3862 - [`Duration::from_secs`][47300]
3863 - [`Duration::from_millis`][47300]
3867 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3868 - [`cargo new` now defaults to creating a binary crate, instead of a
3869 library crate.][cargo/5029]
3873 - [Rust by example is now shipped with new releases][46196]
3877 - [Deprecated `net::lookup_host`.][47510]
3878 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3879 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3880 around indexing operations (see [#47349][47349]). This has been fixed (which also
3881 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3882 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3884 [33903]: https://github.com/rust-lang/rust/pull/33903
3885 [47947]: https://github.com/rust-lang/rust/pull/47947
3886 [47948]: https://github.com/rust-lang/rust/pull/47948
3887 [47760]: https://github.com/rust-lang/rust/pull/47760
3888 [47790]: https://github.com/rust-lang/rust/pull/47790
3889 [47828]: https://github.com/rust-lang/rust/pull/47828
3890 [47398]: https://github.com/rust-lang/rust/pull/47398
3891 [47510]: https://github.com/rust-lang/rust/pull/47510
3892 [47521]: https://github.com/rust-lang/rust/pull/47521
3893 [47204]: https://github.com/rust-lang/rust/pull/47204
3894 [47251]: https://github.com/rust-lang/rust/pull/47251
3895 [47268]: https://github.com/rust-lang/rust/pull/47268
3896 [47282]: https://github.com/rust-lang/rust/pull/47282
3897 [47300]: https://github.com/rust-lang/rust/pull/47300
3898 [47349]: https://github.com/rust-lang/rust/pull/47349
3899 [46931]: https://github.com/rust-lang/rust/pull/46931
3900 [46985]: https://github.com/rust-lang/rust/pull/46985
3901 [47006]: https://github.com/rust-lang/rust/pull/47006
3902 [46830]: https://github.com/rust-lang/rust/pull/46830
3903 [46095]: https://github.com/rust-lang/rust/pull/46095
3904 [46666]: https://github.com/rust-lang/rust/pull/46666
3905 [46196]: https://github.com/rust-lang/rust/pull/46196
3906 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3907 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3908 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3909 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3910 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3913 Version 1.24.1 (2018-03-01)
3914 ==========================
3916 - [Do not abort when unwinding through FFI][48251]
3917 - [Emit UTF-16 files for linker arguments on Windows][48318]
3918 - [Make the error index generator work again][48308]
3919 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3921 [48251]: https://github.com/rust-lang/rust/issues/48251
3922 [48308]: https://github.com/rust-lang/rust/issues/48308
3923 [48318]: https://github.com/rust-lang/rust/issues/48318
3924 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3927 Version 1.24.0 (2018-02-15)
3928 ==========================
3932 - [External `sysv64` ffi is now available.][46528]
3933 eg. `extern "sysv64" fn foo () {}`
3937 - [rustc now uses 16 codegen units by default for release builds.][46910]
3938 For the fastest builds, utilize `codegen-units=1`.
3939 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3940 - [Add `aarch64-unknown-openbsd` support][46760]
3944 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3945 improvement in performance in the majority of cases.
3946 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3947 with Windows.][46798]
3948 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3949 - [impl `From<bool>` for `AtomicBool`][46293]
3950 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3951 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3952 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3953 - [float::from_bits now just uses transmute.][46012] This provides
3954 some optimisations from LLVM.
3955 - [Copied `AsciiExt` methods onto `char`][46077]
3956 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3957 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3958 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3959 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3963 - [`RefCell::replace`]
3965 - [`atomic::spin_loop_hint`]
3967 The following functions can now be used in a constant expression.
3968 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3970 - [`AtomicBool::new`][46287]
3971 - [`AtomicUsize::new`][46287]
3972 - [`AtomicIsize::new`][46287]
3973 - [`AtomicPtr::new`][46287]
3974 - [`Cell::new`][46287]
3975 - [`{integer}::min_value`][46287]
3976 - [`{integer}::max_value`][46287]
3977 - [`mem::size_of`][46287]
3978 - [`mem::align_of`][46287]
3979 - [`ptr::null`][46287]
3980 - [`ptr::null_mut`][46287]
3981 - [`RefCell::new`][46287]
3982 - [`UnsafeCell::new`][46287]
3986 - [Added a `workspace.default-members` config that
3987 overrides implied `--all` in virtual workspaces.][cargo/4743]
3988 - [Enable incremental by default on development builds.][cargo/4817] Also added
3989 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3990 per-project or global basis respectively.
3997 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3998 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3999 in accordance with IETF RFC 4291 §2.2.
4000 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
4001 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
4002 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
4003 - [Leading zeros in tuple struct members is now an error][47084]
4004 - [`column!()` macro is one-based instead of zero-based][46977]
4005 - [`fmt::Arguments` can no longer be shared across threads][45198]
4006 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
4007 - [Cargo sets a different working directory for the compiler][cargo/4788]
4009 [44884]: https://github.com/rust-lang/rust/pull/44884
4010 [45198]: https://github.com/rust-lang/rust/pull/45198
4011 [45506]: https://github.com/rust-lang/rust/pull/45506
4012 [45904]: https://github.com/rust-lang/rust/pull/45904
4013 [45990]: https://github.com/rust-lang/rust/pull/45990
4014 [46012]: https://github.com/rust-lang/rust/pull/46012
4015 [46077]: https://github.com/rust-lang/rust/pull/46077
4016 [46094]: https://github.com/rust-lang/rust/pull/46094
4017 [46284]: https://github.com/rust-lang/rust/pull/46284
4018 [46287]: https://github.com/rust-lang/rust/pull/46287
4019 [46293]: https://github.com/rust-lang/rust/pull/46293
4020 [46528]: https://github.com/rust-lang/rust/pull/46528
4021 [46671]: https://github.com/rust-lang/rust/pull/46671
4022 [46713]: https://github.com/rust-lang/rust/pull/46713
4023 [46735]: https://github.com/rust-lang/rust/pull/46735
4024 [46749]: https://github.com/rust-lang/rust/pull/46749
4025 [46760]: https://github.com/rust-lang/rust/pull/46760
4026 [46798]: https://github.com/rust-lang/rust/pull/46798
4027 [46828]: https://github.com/rust-lang/rust/pull/46828
4028 [46831]: https://github.com/rust-lang/rust/pull/46831
4029 [46833]: https://github.com/rust-lang/rust/pull/46833
4030 [46910]: https://github.com/rust-lang/rust/pull/46910
4031 [46977]: https://github.com/rust-lang/rust/pull/46977
4032 [47018]: https://github.com/rust-lang/rust/pull/47018
4033 [47080]: https://github.com/rust-lang/rust/pull/47080
4034 [47084]: https://github.com/rust-lang/rust/pull/47084
4035 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4036 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4037 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4038 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4039 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4040 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4043 Version 1.23.0 (2018-01-04)
4044 ==========================
4048 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4049 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4050 Which should fix some confusing errors in some operations.
4054 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4055 undefined behavior.][45920]
4056 - [rustc now suggests renaming import if names clash.][45660]
4057 - [Display errors/warnings correctly when there are zero-width or
4058 wide characters.][45711]
4059 - [rustc now avoids unnecessary copies of arguments that are
4060 simple bindings][45380] This should improve memory usage on average by 5-10%.
4061 - [Updated musl used to build musl rustc to 1.1.17][45393]
4065 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4066 - [Implement Hash for raw pointers to unsized types][45483]
4067 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4068 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4069 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4070 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4071 and `<*mut T>::as_mut`][44932]
4072 - [Optimized `Thread::{park, unpark}` implementation][45524]
4073 - [Improved `SliceExt::binary_search` performance.][45333]
4074 - [impl `FromIterator<()>` for `()`][45379]
4075 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4083 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4084 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4085 - [Added unit test checking to `cargo check`][cargo/4592]
4086 - [Cargo now lets you install a specific version
4087 using `cargo install --version`][cargo/4637]
4091 - [Releases now ship with the Cargo book documentation.][45692]
4092 - [rustdoc now prints rendering warnings on every run.][45324]
4096 - [Changes have been made to type equality to make it more correct,
4097 in rare cases this could break some code.][45853] [Tracking issue for
4098 further information][45852]
4099 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4100 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4101 Android 9, the minimum supported version is Android 14.
4102 - [Bumped the minimum LLVM to 3.9][45326]
4104 [44042]: https://github.com/rust-lang/rust/pull/44042
4105 [44932]: https://github.com/rust-lang/rust/pull/44932
4106 [45267]: https://github.com/rust-lang/rust/pull/45267
4107 [45324]: https://github.com/rust-lang/rust/pull/45324
4108 [45326]: https://github.com/rust-lang/rust/pull/45326
4109 [45333]: https://github.com/rust-lang/rust/pull/45333
4110 [45379]: https://github.com/rust-lang/rust/pull/45379
4111 [45380]: https://github.com/rust-lang/rust/pull/45380
4112 [45393]: https://github.com/rust-lang/rust/pull/45393
4113 [45435]: https://github.com/rust-lang/rust/pull/45435
4114 [45483]: https://github.com/rust-lang/rust/pull/45483
4115 [45524]: https://github.com/rust-lang/rust/pull/45524
4116 [45571]: https://github.com/rust-lang/rust/pull/45571
4117 [45580]: https://github.com/rust-lang/rust/pull/45580
4118 [45610]: https://github.com/rust-lang/rust/pull/45610
4119 [45660]: https://github.com/rust-lang/rust/pull/45660
4120 [45692]: https://github.com/rust-lang/rust/pull/45692
4121 [45711]: https://github.com/rust-lang/rust/pull/45711
4122 [45772]: https://github.com/rust-lang/rust/pull/45772
4123 [45852]: https://github.com/rust-lang/rust/issues/45852
4124 [45853]: https://github.com/rust-lang/rust/pull/45853
4125 [45887]: https://github.com/rust-lang/rust/pull/45887
4126 [45920]: https://github.com/rust-lang/rust/pull/45920
4127 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4128 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4129 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4132 Version 1.22.1 (2017-11-22)
4133 ==========================
4135 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4137 [46183]: https://github.com/rust-lang/rust/pull/46183
4139 Version 1.22.0 (2017-11-22)
4140 ==========================
4144 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4145 - [Now accepts underscores in unicode escapes][43716]
4146 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4147 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4151 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4152 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4153 This should decrease compile times for debug builds.
4154 - [strict memory alignment now enabled on ARMv6][45094]
4155 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4159 - [Allow atomic operations up to 32 bits
4160 on `armv5te_unknown_linux_gnueabi`][44978]
4161 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4162 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4163 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4164 - [Properly detect overflow in `Instant += Duration`.][44220]
4165 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4166 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4167 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4174 - [Cargo will now build multi file examples in subdirectories of the `examples`
4175 folder that have a `main.rs` file.][cargo/4496]
4176 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4177 the old format will continue to work and can be updated with `cargo update`.
4178 - [Now supports vendoring git repositories][cargo/3992]
4182 - [`libbacktrace` is now available on Apple platforms.][44251]
4183 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4184 This now lets you specify that a given code example will fail to compile.
4188 - [The minimum Android version that rustc can build for has been bumped
4189 to `4.0` from `2.3`][45656]
4190 - [Allowing `T op= &T` for numeric types has broken some type
4191 inference cases][45480]
4194 [42526]: https://github.com/rust-lang/rust/pull/42526
4195 [43017]: https://github.com/rust-lang/rust/pull/43017
4196 [43716]: https://github.com/rust-lang/rust/pull/43716
4197 [43949]: https://github.com/rust-lang/rust/pull/43949
4198 [44015]: https://github.com/rust-lang/rust/pull/44015
4199 [44220]: https://github.com/rust-lang/rust/pull/44220
4200 [44251]: https://github.com/rust-lang/rust/pull/44251
4201 [44287]: https://github.com/rust-lang/rust/pull/44287
4202 [44303]: https://github.com/rust-lang/rust/pull/44303
4203 [44456]: https://github.com/rust-lang/rust/pull/44456
4204 [44466]: https://github.com/rust-lang/rust/pull/44466
4205 [44895]: https://github.com/rust-lang/rust/pull/44895
4206 [44966]: https://github.com/rust-lang/rust/pull/44966
4207 [44978]: https://github.com/rust-lang/rust/pull/44978
4208 [45041]: https://github.com/rust-lang/rust/pull/45041
4209 [45064]: https://github.com/rust-lang/rust/pull/45064
4210 [45075]: https://github.com/rust-lang/rust/pull/45075
4211 [45094]: https://github.com/rust-lang/rust/pull/45094
4212 [45095]: https://github.com/rust-lang/rust/pull/45095
4213 [45480]: https://github.com/rust-lang/rust/issues/45480
4214 [45656]: https://github.com/rust-lang/rust/pull/45656
4215 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4216 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4217 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4224 Version 1.21.0 (2017-10-12)
4225 ==========================
4229 - [You can now use static references for literals.][43838]
4233 let x: &'static u32 = &0;
4236 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4239 my_macro!(Vec<i32>::new); // Always worked
4240 my_macro!(Vec::<i32>::new); // Now works
4245 - [Upgraded jemalloc to 4.5.0][43911]
4246 - [Enabled unwinding panics on Redox][43917]
4247 - [Now runs LLVM in parallel during translation phase.][43506]
4248 This should reduce peak memory usage.
4252 - [Generate builtin impls for `Clone` for all arrays and tuples that
4253 are `T: Clone`][43690]
4254 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4255 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4256 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4261 [`std::mem::discriminant`]
4265 - [You can now call `cargo install` with multiple package names][cargo/4216]
4266 - [Cargo commands inside a virtual workspace will now implicitly
4267 pass `--all`][cargo/4335]
4268 - [Added a `[patch]` section to `Cargo.toml` to handle
4269 prepublication dependencies][cargo/4123] [RFC 1969]
4270 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4271 like patterns][cargo/4270]
4272 - [Added the `--all-targets` option][cargo/4400]
4273 - [Using required dependencies as a feature is now deprecated and emits
4274 a warning][cargo/4364]
4279 - [Cargo docs are moving][43916]
4280 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4281 - [The rustdoc book is now available][43863]
4282 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4283 - [Added a preview of RLS has been made available through rustup][44204]
4284 Install with `rustup component add rls-preview`
4285 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4286 Previously only showed `std::os::unix`.
4290 - [Changes in method matching against higher-ranked types][43880] This may cause
4291 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4292 - [rustc's JSON error output's byte position start at top of file.][42973]
4293 Was previously relative to the rustc's internal `CodeMap` struct which
4294 required the unstable library `libsyntax` to correctly use.
4295 - [`unused_results` lint no longer ignores booleans][43728]
4297 [42565]: https://github.com/rust-lang/rust/pull/42565
4298 [42973]: https://github.com/rust-lang/rust/pull/42973
4299 [43348]: https://github.com/rust-lang/rust/pull/43348
4300 [43459]: https://github.com/rust-lang/rust/pull/43459
4301 [43506]: https://github.com/rust-lang/rust/pull/43506
4302 [43540]: https://github.com/rust-lang/rust/pull/43540
4303 [43690]: https://github.com/rust-lang/rust/pull/43690
4304 [43728]: https://github.com/rust-lang/rust/pull/43728
4305 [43838]: https://github.com/rust-lang/rust/pull/43838
4306 [43863]: https://github.com/rust-lang/rust/pull/43863
4307 [43880]: https://github.com/rust-lang/rust/pull/43880
4308 [43911]: https://github.com/rust-lang/rust/pull/43911
4309 [43916]: https://github.com/rust-lang/rust/pull/43916
4310 [43917]: https://github.com/rust-lang/rust/pull/43917
4311 [44204]: https://github.com/rust-lang/rust/pull/44204
4312 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4313 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4314 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4315 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4316 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4317 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4318 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4319 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4320 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4322 Version 1.20.0 (2017-08-31)
4323 ===========================
4327 - [Associated constants are now stabilised.][42809]
4328 - [A lot of macro bugs are now fixed.][42913]
4333 - [Struct fields are now properly coerced to the expected field type.][42807]
4334 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4335 `wasm32-experimental-emscripten` target.
4336 - [Changed some of the error messages to be more helpful.][42033]
4337 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4339 - [rustc now reports the total number of errors on compilation failure][43015]
4340 previously this was only the number of errors in the pass that failed.
4341 - [Expansion in rustc has been sped up 29x.][42533]
4342 - [added `msp430-none-elf` target.][43099]
4343 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4345 - [Fixes backtraces on Redox][43228]
4346 - [rustc now identifies different versions of same crate when absolute paths of
4347 different types match in an error message.][42826]
4353 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4354 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4356 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4357 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4358 - [Impl `Clone` for `DefaultHasher`.][42799]
4359 - [Impl `Sync` for `SyncSender`.][42397]
4360 - [Impl `FromStr` for `char`][42271]
4361 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4363 - [allow messages in the `unimplemented!()` macro.][42155]
4364 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4365 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4366 - [Upgrade to Unicode 10.0.0][42999]
4367 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4368 - [Skip the main thread's manual stack guard on Linux][43072]
4369 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4370 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4372 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4377 - [`CStr::into_c_string`]
4378 - [`CString::as_c_str`]
4379 - [`CString::into_boxed_c_str`]
4380 - [`Chain::get_mut`]
4381 - [`Chain::get_ref`]
4382 - [`Chain::into_inner`]
4383 - [`Option::get_or_insert_with`]
4384 - [`Option::get_or_insert`]
4385 - [`OsStr::into_os_string`]
4386 - [`OsString::into_boxed_os_str`]
4389 - [`Utf8Error::error_len`]
4390 - [`char::EscapeDebug`]
4391 - [`char::escape_debug`]
4392 - [`compile_error!`]
4393 - [`f32::from_bits`]
4395 - [`f64::from_bits`]
4397 - [`mem::ManuallyDrop`]
4398 - [`slice::sort_unstable_by_key`]
4399 - [`slice::sort_unstable_by`]
4400 - [`slice::sort_unstable`]
4401 - [`str::from_boxed_utf8_unchecked`]
4402 - [`str::as_bytes_mut`]
4403 - [`str::as_bytes_mut`]
4404 - [`str::from_utf8_mut`]
4405 - [`str::from_utf8_unchecked_mut`]
4407 - [`str::get_unchecked_mut`]
4408 - [`str::get_unchecked`]
4410 - [`str::into_boxed_bytes`]
4415 - [Cargo API token location moved from `~/.cargo/config` to
4416 `~/.cargo/credentials`.][cargo/3978]
4417 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4418 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4419 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4420 - [You can now specify version of a binary when installed through
4421 `cargo install` using `--vers`.][cargo/4229]
4422 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4423 failure.][cargo/4248]
4424 - [Changed the convention around which file is the crate root.][cargo/4259]
4425 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4426 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4431 - [Functions with `'static` in their return types will now not be as usable as
4432 if they were using lifetime parameters instead.][42417]
4433 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4434 takes the sign of NaN into account where previously didn't.][42430]
4436 [42033]: https://github.com/rust-lang/rust/pull/42033
4437 [42155]: https://github.com/rust-lang/rust/pull/42155
4438 [42271]: https://github.com/rust-lang/rust/pull/42271
4439 [42397]: https://github.com/rust-lang/rust/pull/42397
4440 [42417]: https://github.com/rust-lang/rust/pull/42417
4441 [42430]: https://github.com/rust-lang/rust/pull/42430
4442 [42431]: https://github.com/rust-lang/rust/pull/42431
4443 [42533]: https://github.com/rust-lang/rust/pull/42533
4444 [42571]: https://github.com/rust-lang/rust/pull/42571
4445 [42613]: https://github.com/rust-lang/rust/pull/42613
4446 [42799]: https://github.com/rust-lang/rust/pull/42799
4447 [42807]: https://github.com/rust-lang/rust/pull/42807
4448 [42809]: https://github.com/rust-lang/rust/pull/42809
4449 [42822]: https://github.com/rust-lang/rust/pull/42822
4450 [42826]: https://github.com/rust-lang/rust/pull/42826
4451 [42854]: https://github.com/rust-lang/rust/pull/42854
4452 [42913]: https://github.com/rust-lang/rust/pull/42913
4453 [42999]: https://github.com/rust-lang/rust/pull/42999
4454 [43011]: https://github.com/rust-lang/rust/pull/43011
4455 [43015]: https://github.com/rust-lang/rust/pull/43015
4456 [43072]: https://github.com/rust-lang/rust/pull/43072
4457 [43077]: https://github.com/rust-lang/rust/pull/43077
4458 [43097]: https://github.com/rust-lang/rust/pull/43097
4459 [43099]: https://github.com/rust-lang/rust/pull/43099
4460 [43170]: https://github.com/rust-lang/rust/pull/43170
4461 [43178]: https://github.com/rust-lang/rust/pull/43178
4462 [43185]: https://github.com/rust-lang/rust/pull/43185
4463 [43228]: https://github.com/rust-lang/rust/pull/43228
4464 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4465 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4466 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4467 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4468 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4469 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4470 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4471 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4472 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4473 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4474 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4475 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4476 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4477 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4478 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4479 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4480 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4481 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4482 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4483 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4484 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4485 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4486 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4487 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4488 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4489 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4490 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4491 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4492 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4493 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4494 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4495 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4496 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4497 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4498 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4499 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4500 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4501 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4502 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4505 Version 1.19.0 (2017-07-20)
4506 ===========================
4511 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4512 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4513 - [Macro recursion limit increased to 1024 from 64.][41676]
4514 - [Added lint for detecting unused macros.][41907]
4515 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4516 For example: `let x = loop { break 7; };`
4517 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4518 contain `Copy` types and cannot have a `Drop` implementation.
4519 Example: `union Foo { bar: u8, baz: usize }`
4520 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4521 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4526 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4527 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4528 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4529 you should use `--target armv7-linux-androideabi`.
4530 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4531 - [Minor optimisation of string operations.][42037]
4532 - [Compiler error message is now `aborting due to previous error(s)` instead of
4533 `aborting due to N previous errors`][42150] This was previously inaccurate and
4534 would only count certain kinds of errors.
4535 - [The compiler now supports Visual Studio 2017][42225]
4536 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4537 - [Added a lot][42264] of [new error codes][42302]
4538 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4539 libraries with C Run-time Libraries(CRT) to be statically linked.
4540 - [Fixed various ARM codegen bugs][42740]
4545 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4546 `Extend<Cow<'a, str>>`][41449]
4547 - [`Vec` now implements `From<&mut [T]>`][41530]
4548 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4549 - [`SplitWhitespace` now implements `Clone`][41659]
4550 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4552 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4553 macros, but for printing to stderr.
4558 - [`OsString::shrink_to_fit`]
4561 - [`thread::ThreadId`]
4566 - [Build scripts can now add environment variables to the environment
4567 the crate is being compiled in.
4568 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4569 - [Subcommands now replace the current process rather than spawning a new
4570 child process][cargo/3970]
4571 - [Workspace members can now accept glob file patterns][cargo/3979]
4572 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4573 the members in a given workspace.][cargo/3988]
4574 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4575 - [Target directory path is now in the cargo metadata][cargo/4022]
4576 - [Cargo no longer checks out a local working directory for the
4577 crates.io index][cargo/4026] This should provide smaller file size for the
4578 registry, and improve cloning times, especially on Windows machines.
4579 - [Added an `--exclude` option for excluding certain packages when using the
4580 `--all` option][cargo/4031]
4581 - [Cargo will now automatically retry when receiving a 5xx error
4582 from crates.io][cargo/4032]
4583 - [The `--features` option now accepts multiple comma or space
4584 delimited values.][cargo/4084]
4585 - [Added support for custom target specific runners][cargo/3954]
4590 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4592 - [Rust will now release XZ compressed packages][rust-installer/57]
4593 - [rustup will now prefer to download rust packages with
4594 XZ compression][rustup/1100] over GZip packages.
4595 - [Added the ability to escape `#` in rust documentation][41785] By adding
4596 additional `#`'s ie. `##` is now `#`
4601 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4602 - [`-Z` flags are now no longer allowed to be used on the stable
4603 compiler.][41751] This has been a warning for a year previous to this.
4604 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4605 longer works][42844]. Users should migrate to the built-in `check`
4606 command, which has been available since 1.16.
4607 - [Ending a float literal with `._` is now a hard error.
4608 Example: `42._` .][41946]
4609 - [Any use of a private `extern crate` outside of its module is now a
4610 hard error.][36886] This was previously a warning.
4611 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4612 relative while the `::` prefix makes a path absolute, but was ignored and the
4613 path was relative regardless.
4614 - [Floating point constants in match patterns is now a hard error][36890]
4615 This was previously a warning.
4616 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4617 match patterns is now a hard error][36891] This was previously a warning.
4618 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4620 - [From the pound escape, lines consisting of multiple `#`s are
4622 - [It is an error to re-export private enum variants][42460]. This is
4623 known to break a number of crates that depend on an older version of
4625 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4626 to use it to find the linker, and the build will fail where it did
4627 not previously][42607]
4629 [36886]: https://github.com/rust-lang/rust/issues/36886
4630 [36888]: https://github.com/rust-lang/rust/issues/36888
4631 [36890]: https://github.com/rust-lang/rust/issues/36890
4632 [36891]: https://github.com/rust-lang/rust/issues/36891
4633 [36892]: https://github.com/rust-lang/rust/issues/36892
4634 [37406]: https://github.com/rust-lang/rust/issues/37406
4635 [39983]: https://github.com/rust-lang/rust/pull/39983
4636 [41145]: https://github.com/rust-lang/rust/pull/41145
4637 [41192]: https://github.com/rust-lang/rust/pull/41192
4638 [41258]: https://github.com/rust-lang/rust/pull/41258
4639 [41370]: https://github.com/rust-lang/rust/pull/41370
4640 [41449]: https://github.com/rust-lang/rust/pull/41449
4641 [41530]: https://github.com/rust-lang/rust/pull/41530
4642 [41624]: https://github.com/rust-lang/rust/pull/41624
4643 [41656]: https://github.com/rust-lang/rust/pull/41656
4644 [41659]: https://github.com/rust-lang/rust/pull/41659
4645 [41676]: https://github.com/rust-lang/rust/pull/41676
4646 [41751]: https://github.com/rust-lang/rust/pull/41751
4647 [41764]: https://github.com/rust-lang/rust/pull/41764
4648 [41785]: https://github.com/rust-lang/rust/pull/41785
4649 [41873]: https://github.com/rust-lang/rust/pull/41873
4650 [41907]: https://github.com/rust-lang/rust/pull/41907
4651 [41946]: https://github.com/rust-lang/rust/pull/41946
4652 [42016]: https://github.com/rust-lang/rust/pull/42016
4653 [42037]: https://github.com/rust-lang/rust/pull/42037
4654 [42068]: https://github.com/rust-lang/rust/pull/42068
4655 [42150]: https://github.com/rust-lang/rust/pull/42150
4656 [42162]: https://github.com/rust-lang/rust/pull/42162
4657 [42225]: https://github.com/rust-lang/rust/pull/42225
4658 [42264]: https://github.com/rust-lang/rust/pull/42264
4659 [42302]: https://github.com/rust-lang/rust/pull/42302
4660 [42460]: https://github.com/rust-lang/rust/issues/42460
4661 [42607]: https://github.com/rust-lang/rust/issues/42607
4662 [42740]: https://github.com/rust-lang/rust/pull/42740
4663 [42844]: https://github.com/rust-lang/rust/issues/42844
4664 [42948]: https://github.com/rust-lang/rust/pull/42948
4665 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4666 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4667 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4668 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4669 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4670 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4671 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4672 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4673 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4674 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4675 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4676 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4677 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4678 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4679 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4680 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4681 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4682 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4683 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4684 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4685 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4686 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4689 Version 1.18.0 (2017-06-08)
4690 ===========================
4695 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4696 make the item visible to just that module tree. Also accepts the keyword
4697 `crate` to make something public to the whole crate but not users of the
4698 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4699 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4700 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4701 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4702 types like `Write + Send`, trailing `+` are now supported in trait objects,
4703 and better error reporting for trait objects starting with `?Sized`.
4704 - [0e+10 is now a valid floating point literal][40589]
4705 - [Now warns if you bind a lifetime parameter to 'static][40734]
4706 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4707 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4708 representation in some cases.][40377]
4713 - [rustc can now emit mir with `--emit mir`][39891]
4714 - [Improved LLVM IR for trivial functions][40367]
4715 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4716 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4717 opportunities found through profiling
4718 - [Improved backtrace formatting when panicking][38165]
4723 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4724 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4725 iteration or reallocation.
4726 - [Simplified HashMap Bucket interface][40561] provides performance
4727 improvements for iterating and cloning.
4728 - [Specialize Vec::from_elem to use calloc][40409]
4729 - [Fixed Race condition in fs::create_dir_all][39799]
4730 - [No longer caching stdio on Windows][40516]
4731 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4732 2.50%~ faster and in one case now 12.50% faster.
4733 - [Optimized `AtomicBool::fetch_nand`][41143]
4738 - [`Child::try_wait`]
4739 - [`HashMap::retain`]
4740 - [`HashSet::retain`]
4742 - [`TcpStream::peek`]
4743 - [`UdpSocket::peek`]
4744 - [`UdpSocket::peek_from`]
4749 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4750 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4751 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4752 - [Added Android build support][cargo/3885]
4753 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4754 of a certain type, for example `cargo build --bins` will build all
4756 - [Added support for haiku][cargo/3952]
4761 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4762 - [Added rust-windbg script for better debugging on Windows][39983]
4763 - [Rust now uses the official cross compiler for NetBSD][40612]
4764 - [rustdoc now accepts `#` at the start of files][40828]
4765 - [Fixed jemalloc support for musl][41168]
4770 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4771 always placed after the sign if it exists and before the digits. With the `#`
4772 flag the zeroes are placed after the prefix and before the digits.
4773 - [Due to the struct field optimisation][40377], using `transmute` on structs
4774 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4775 always been undefined behavior, but is now more likely to break in practice.
4776 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4777 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4778 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4779 - [Overlapping inherent `impl`s are now a hard error][40728]
4780 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4781 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4782 `out.asm` and `out.ll` instead of only one of the filetypes.
4783 - [ calling a function that returns `Self` will no longer work][41805] when
4784 the size of `Self` cannot be statically determined.
4785 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4786 this has caused a few regressions namely:
4788 - Changed the link order of local static/dynamic libraries (respecting the
4789 order on given rather than having the compiler reorder).
4790 - Changed how MinGW is linked, native code linked to dynamic libraries
4791 may require manually linking to the gcc support library (for the native
4794 [38165]: https://github.com/rust-lang/rust/pull/38165
4795 [39799]: https://github.com/rust-lang/rust/pull/39799
4796 [39891]: https://github.com/rust-lang/rust/pull/39891
4797 [39983]: https://github.com/rust-lang/rust/pull/39983
4798 [40043]: https://github.com/rust-lang/rust/pull/40043
4799 [40241]: https://github.com/rust-lang/rust/pull/40241
4800 [40338]: https://github.com/rust-lang/rust/pull/40338
4801 [40367]: https://github.com/rust-lang/rust/pull/40367
4802 [40377]: https://github.com/rust-lang/rust/pull/40377
4803 [40409]: https://github.com/rust-lang/rust/pull/40409
4804 [40516]: https://github.com/rust-lang/rust/pull/40516
4805 [40556]: https://github.com/rust-lang/rust/pull/40556
4806 [40561]: https://github.com/rust-lang/rust/pull/40561
4807 [40589]: https://github.com/rust-lang/rust/pull/40589
4808 [40612]: https://github.com/rust-lang/rust/pull/40612
4809 [40723]: https://github.com/rust-lang/rust/pull/40723
4810 [40728]: https://github.com/rust-lang/rust/pull/40728
4811 [40731]: https://github.com/rust-lang/rust/pull/40731
4812 [40734]: https://github.com/rust-lang/rust/pull/40734
4813 [40805]: https://github.com/rust-lang/rust/pull/40805
4814 [40807]: https://github.com/rust-lang/rust/pull/40807
4815 [40828]: https://github.com/rust-lang/rust/pull/40828
4816 [40870]: https://github.com/rust-lang/rust/pull/40870
4817 [41085]: https://github.com/rust-lang/rust/pull/41085
4818 [41143]: https://github.com/rust-lang/rust/pull/41143
4819 [41168]: https://github.com/rust-lang/rust/pull/41168
4820 [41270]: https://github.com/rust-lang/rust/issues/41270
4821 [41469]: https://github.com/rust-lang/rust/pull/41469
4822 [41805]: https://github.com/rust-lang/rust/issues/41805
4823 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4824 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4825 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4826 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4827 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4828 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4829 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4830 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4831 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4832 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4833 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4834 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4835 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4836 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4839 Version 1.17.0 (2017-04-27)
4840 ===========================
4845 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4846 * [Fields of structs may be initialized without duplicating the field/variable
4847 names][39761]. [RFC 1682]
4848 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4849 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4850 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4851 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4852 `'b`. Soundness fix.
4853 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4854 * [Static variables may contain references to other statics][40027]
4859 * [Exit quickly on only `--emit dep-info`][40336]
4860 * [Make `-C relocation-model` more correctly determine whether the linker
4861 creates a position-independent executable][40245]
4862 * [Add `-C overflow-checks` to directly control whether integer overflow
4864 * [The rustc type checker now checks items on demand instead of in a single
4865 in-order pass][40008]. This is mostly an internal refactoring in support of
4866 future work, including incremental type checking, but also resolves [RFC
4867 1647], allowing `Self` to appear in `impl` `where` clauses.
4868 * [Optimize vtable loads][39995]
4869 * [Turn off vectorization for Emscripten targets][39990]
4870 * [Provide suggestions for unknown macros imported with `use`][39953]
4871 * [Fix ICEs in path resolution][39939]
4872 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4873 * [Add clearer error message using `&str + &str`][39116]
4884 * [`Ordering::then`]
4885 * [`Ordering::then_with`]
4886 * [`BTreeMap::range`]
4887 * [`BTreeMap::range_mut`]
4888 * [`collections::Bound`]
4889 * [`process::abort`]
4890 * [`ptr::read_unaligned`]
4891 * [`ptr::write_unaligned`]
4892 * [`Result::expect_err`]
4895 * [`Cell::into_inner`]
4901 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4902 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4903 * [`String` implements `FromIterator<&char>`][40028]
4904 * `Box` [implements][40009] a number of new conversions:
4905 `From<Box<str>> for String`,
4906 `From<Box<[T]>> for Vec<T>`,
4907 `From<Box<CStr>> for CString`,
4908 `From<Box<OsStr>> for OsString`,
4909 `From<Box<Path>> for PathBuf`,
4910 `Into<Box<str>> for String`,
4911 `Into<Box<[T]>> for Vec<T>`,
4912 `Into<Box<CStr>> for CString`,
4913 `Into<Box<OsStr>> for OsString`,
4914 `Into<Box<Path>> for PathBuf`,
4915 `Default for Box<str>`,
4916 `Default for Box<CStr>`,
4917 `Default for Box<OsStr>`,
4918 `From<&CStr> for Box<CStr>`,
4919 `From<&OsStr> for Box<OsStr>`,
4920 `From<&Path> for Box<Path>`
4921 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4922 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4923 * [Slightly optimize `slice::sort`][39538]
4924 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4925 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4926 `Box<str>` implements `From<&str>`][39438]
4927 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4928 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4929 * [`format!` estimates the needed capacity before writing a string][39356]
4930 * [Support unprivileged symlink creation in Windows][38921]
4931 * [`PathBuf` implements `Default`][38764]
4932 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4933 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4934 and poor hash functions.
4939 * [Add `cargo check --all`][cargo/3731]
4940 * [Add an option to ignore SSL revocation checking][cargo/3699]
4941 * [Add `cargo run --package`][cargo/3691]
4942 * [Add `required_features`][cargo/3667]
4943 * [Assume `build.rs` is a build script][cargo/3664]
4944 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4949 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4951 * [The "Unstable Book" documents nightly-only features][ubook]
4952 * [Improve the style of the sidebar in rustdoc output][40265]
4953 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4954 * [Fix MSP430 breakage due to `i128`][40257]
4955 * [Preliminary Solaris/SPARCv9 support][39903]
4956 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4957 run without installing the MSVC runtime.
4958 * [`rustdoc --test` includes file names in test names][39788]
4959 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4960 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4961 * [Initial support for `aarch64-unknown-freebsd`][39491]
4962 * [Initial support for `i686-unknown-netbsd`][39426]
4963 * [This release no longer includes the old makefile build system][39431]. Rust
4964 is built with a custom build system, written in Rust, and with Cargo.
4965 * [Add Debug implementations for libcollection structs][39002]
4966 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4967 * [`--test-threads=0` produces an error][38945]
4968 * [`rustup` installs documentation by default][40526]
4969 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4970 WinDbg and Visual Studio to improve the debugging experience.
4975 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4976 workaround, either use MSVC 2015 or run vcvars.bat.
4977 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4978 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4979 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4981 * [`format!` and `Display::to_string` panic if an underlying formatting
4982 implementation returns an error][40117]. Previously the error was silently
4983 ignored. It is incorrect for `write_fmt` to return an error when writing
4985 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4986 crates were marked stable and could be accessed from the stable toolchain.
4987 * [Rust git source no longer includes vendored crates][39728]. Those that need
4988 to build with vendored crates should build from release tarballs.
4989 * [Fix inert attributes from `proc_macro_derives`][39572]
4990 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4991 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4993 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4994 existing code generally ignores the type of dead-code unless a type-hint is
4995 provided; this can cause surprising inference interactions particularly around
4996 defaulting. The new code uniformly ignores the result type of dead-code.
4997 * [Tuple-struct constructors with private fields are no longer visible][38932]
4998 * [Lifetime parameters that do not appear in the arguments are now considered
4999 early-bound][38897], resolving a soundness bug (#[32330]). The
5000 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5002 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5003 * [Make transmuting from fn item types to pointer-sized types a hard
5006 [27787]: https://github.com/rust-lang/rust/issues/27787
5007 [32330]: https://github.com/rust-lang/rust/issues/32330
5008 [34198]: https://github.com/rust-lang/rust/pull/34198
5009 [38161]: https://github.com/rust-lang/rust/pull/38161
5010 [38368]: https://github.com/rust-lang/rust/pull/38368
5011 [38584]: https://github.com/rust-lang/rust/issues/38584
5012 [38661]: https://github.com/rust-lang/rust/pull/38661
5013 [38764]: https://github.com/rust-lang/rust/pull/38764
5014 [38864]: https://github.com/rust-lang/rust/issues/38864
5015 [38897]: https://github.com/rust-lang/rust/pull/38897
5016 [38921]: https://github.com/rust-lang/rust/pull/38921
5017 [38932]: https://github.com/rust-lang/rust/pull/38932
5018 [38945]: https://github.com/rust-lang/rust/pull/38945
5019 [38981]: https://github.com/rust-lang/rust/pull/38981
5020 [39002]: https://github.com/rust-lang/rust/pull/39002
5021 [39116]: https://github.com/rust-lang/rust/pull/39116
5022 [39193]: https://github.com/rust-lang/rust/pull/39193
5023 [39265]: https://github.com/rust-lang/rust/pull/39265
5024 [39356]: https://github.com/rust-lang/rust/pull/39356
5025 [39372]: https://github.com/rust-lang/rust/pull/39372
5026 [39426]: https://github.com/rust-lang/rust/pull/39426
5027 [39431]: https://github.com/rust-lang/rust/pull/39431
5028 [39438]: https://github.com/rust-lang/rust/pull/39438
5029 [39440]: https://github.com/rust-lang/rust/pull/39440
5030 [39485]: https://github.com/rust-lang/rust/pull/39485
5031 [39491]: https://github.com/rust-lang/rust/pull/39491
5032 [39518]: https://github.com/rust-lang/rust/pull/39518
5033 [39538]: https://github.com/rust-lang/rust/pull/39538
5034 [39572]: https://github.com/rust-lang/rust/pull/39572
5035 [39633]: https://github.com/rust-lang/rust/pull/39633
5036 [39642]: https://github.com/rust-lang/rust/pull/39642
5037 [39728]: https://github.com/rust-lang/rust/pull/39728
5038 [39761]: https://github.com/rust-lang/rust/pull/39761
5039 [39788]: https://github.com/rust-lang/rust/pull/39788
5040 [39793]: https://github.com/rust-lang/rust/pull/39793
5041 [39837]: https://github.com/rust-lang/rust/pull/39837
5042 [39843]: https://github.com/rust-lang/rust/pull/39843
5043 [39851]: https://github.com/rust-lang/rust/pull/39851
5044 [39903]: https://github.com/rust-lang/rust/pull/39903
5045 [39939]: https://github.com/rust-lang/rust/pull/39939
5046 [39953]: https://github.com/rust-lang/rust/pull/39953
5047 [39960]: https://github.com/rust-lang/rust/pull/39960
5048 [39990]: https://github.com/rust-lang/rust/pull/39990
5049 [39995]: https://github.com/rust-lang/rust/pull/39995
5050 [40008]: https://github.com/rust-lang/rust/pull/40008
5051 [40009]: https://github.com/rust-lang/rust/pull/40009
5052 [40027]: https://github.com/rust-lang/rust/pull/40027
5053 [40028]: https://github.com/rust-lang/rust/pull/40028
5054 [40037]: https://github.com/rust-lang/rust/pull/40037
5055 [40117]: https://github.com/rust-lang/rust/pull/40117
5056 [40166]: https://github.com/rust-lang/rust/pull/40166
5057 [40245]: https://github.com/rust-lang/rust/pull/40245
5058 [40257]: https://github.com/rust-lang/rust/pull/40257
5059 [40261]: https://github.com/rust-lang/rust/pull/40261
5060 [40265]: https://github.com/rust-lang/rust/pull/40265
5061 [40319]: https://github.com/rust-lang/rust/pull/40319
5062 [40336]: https://github.com/rust-lang/rust/pull/40336
5063 [40526]: https://github.com/rust-lang/rust/pull/40526
5064 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5065 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5066 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5067 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5068 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5069 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5070 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5071 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5072 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5073 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5074 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5075 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5076 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5077 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5078 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5079 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5080 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5081 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5082 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5083 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5084 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5085 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5086 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5087 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5088 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5089 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5090 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5091 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5092 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5093 [mdbook]: https://crates.io/crates/mdbook
5094 [ubook]: https://doc.rust-lang.org/unstable-book/
5097 Version 1.16.0 (2017-03-16)
5098 ===========================
5103 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5104 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5105 match patterns][38069]
5106 * [Clean up semantics of `self` in an import list][38313]
5107 * [`Self` may appear in `impl` headers][38920]
5108 * [`Self` may appear in struct expressions][39282]
5113 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5114 a `.rmeta` file containing only crate metadata][38571]. This can be
5115 used by tools like the Rust Language Service to perform
5116 metadata-only builds.
5117 * [Levenshtein based typo suggestions now work in most places, while
5118 previously they worked only for fields and sometimes for local
5119 variables][38927]. Together with the overhaul of "no
5120 resolution"/"unexpected resolution" errors (#[38154]) they result in
5121 large and systematic improvement in resolution diagnostics.
5122 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5124 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5125 * [`rustc` no longer attempts to provide "consider using an explicit
5126 lifetime" suggestions][37057]. They were inaccurate.
5131 * [`VecDeque::truncate`]
5132 * [`VecDeque::resize`]
5133 * [`String::insert_str`]
5134 * [`Duration::checked_add`]
5135 * [`Duration::checked_sub`]
5136 * [`Duration::checked_div`]
5137 * [`Duration::checked_mul`]
5140 * [`SocketAddr::is_ipv4`]
5141 * [`SocketAddr::is_ipv6`]
5142 * [`IpAddr::is_ipv4`]
5143 * [`IpAddr::is_ipv6`]
5145 * [`Vec::dedup_by_key`]
5146 * [`Result::unwrap_or_default`]
5147 * [`<*const T>::wrapping_offset`]
5148 * [`<*mut T>::wrapping_offset`]
5149 * `CommandExt::creation_flags`
5150 * [`File::set_permissions`]
5151 * [`String::split_off`]
5156 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5157 their argument by `Borrow` parameter][37761]
5158 * [All public types in std implement `Debug`][38006]
5159 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5160 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5161 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5163 * [std: Fix partial writes in `LineWriter`][38062]
5164 * [std: Clamp max read/write sizes on Unix][38062]
5165 * [Use more specific panic message for `&str` slicing errors][38066]
5166 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5167 functionality cannot be achieved in std currently.
5168 * [`writeln!`, like `println!`, now accepts a form with no string
5169 or formatting arguments, to just print a newline][38469]
5170 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5171 * [Reduce the size of static data in `std_unicode::tables`][38781]
5172 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5173 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5175 * [`Duration` implements `Sum`][38712]
5176 * [`String` implements `ToSocketAddrs`][39048]
5181 * [The `cargo check` command does a type check of a project without
5182 building it][cargo/3296]
5183 * [crates.io will display CI badges from Travis and AppVeyor, if
5184 specified in Cargo.toml][cargo/3546]
5185 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5186 * [Compilation profiles accept integer values for `debug`, in addition
5187 to `true` and `false`. These are passed to `rustc` as the value to
5188 `-C debuginfo`][cargo/3534]
5189 * [Implement `cargo --version --verbose`][cargo/3604]
5190 * [All builds now output 'dep-info' build dependencies compatible with
5191 make and ninja][cargo/3557]
5192 * [Build all workspace members with `build --all`][cargo/3511]
5193 * [Document all workspace members with `doc --all`][cargo/3515]
5194 * [Path deps outside workspace are not members][cargo/3443]
5199 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5200 the path to the Rust implementation][38589]
5201 * [The `armv7-linux-androideabi` target no longer enables NEON
5202 extensions, per Google's ABI guide][38413]
5203 * [The stock standard library can be compiled for Redox OS][38401]
5204 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5206 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5208 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5213 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5214 match patterns][38069]
5215 * In this release, references to uninhabited types can not be
5216 pattern-matched. This was accidentally allowed in 1.15.
5217 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5218 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5220 * [Clean up semantics of `self` in an import list][38313]
5221 * Reimplemented lifetime elision. This change was almost entirely compatible
5222 with existing code, but it did close a number of small bugs and loopholes,
5223 as well as being more accepting in some other [cases][41105].
5225 [37057]: https://github.com/rust-lang/rust/pull/37057
5226 [37761]: https://github.com/rust-lang/rust/pull/37761
5227 [38006]: https://github.com/rust-lang/rust/pull/38006
5228 [38051]: https://github.com/rust-lang/rust/pull/38051
5229 [38062]: https://github.com/rust-lang/rust/pull/38062
5230 [38062]: https://github.com/rust-lang/rust/pull/38622
5231 [38066]: https://github.com/rust-lang/rust/pull/38066
5232 [38069]: https://github.com/rust-lang/rust/pull/38069
5233 [38131]: https://github.com/rust-lang/rust/pull/38131
5234 [38154]: https://github.com/rust-lang/rust/pull/38154
5235 [38274]: https://github.com/rust-lang/rust/pull/38274
5236 [38304]: https://github.com/rust-lang/rust/pull/38304
5237 [38313]: https://github.com/rust-lang/rust/pull/38313
5238 [38314]: https://github.com/rust-lang/rust/pull/38314
5239 [38327]: https://github.com/rust-lang/rust/pull/38327
5240 [38401]: https://github.com/rust-lang/rust/pull/38401
5241 [38413]: https://github.com/rust-lang/rust/pull/38413
5242 [38469]: https://github.com/rust-lang/rust/pull/38469
5243 [38559]: https://github.com/rust-lang/rust/pull/38559
5244 [38571]: https://github.com/rust-lang/rust/pull/38571
5245 [38580]: https://github.com/rust-lang/rust/pull/38580
5246 [38589]: https://github.com/rust-lang/rust/pull/38589
5247 [38670]: https://github.com/rust-lang/rust/pull/38670
5248 [38712]: https://github.com/rust-lang/rust/pull/38712
5249 [38726]: https://github.com/rust-lang/rust/pull/38726
5250 [38781]: https://github.com/rust-lang/rust/pull/38781
5251 [38798]: https://github.com/rust-lang/rust/pull/38798
5252 [38909]: https://github.com/rust-lang/rust/pull/38909
5253 [38920]: https://github.com/rust-lang/rust/pull/38920
5254 [38927]: https://github.com/rust-lang/rust/pull/38927
5255 [39048]: https://github.com/rust-lang/rust/pull/39048
5256 [39282]: https://github.com/rust-lang/rust/pull/39282
5257 [39379]: https://github.com/rust-lang/rust/pull/39379
5258 [41105]: https://github.com/rust-lang/rust/issues/41105
5259 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5260 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5261 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5262 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5263 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5264 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5265 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5266 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5267 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5268 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5269 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5270 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5271 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5272 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5273 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5274 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5275 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5276 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5277 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5278 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5279 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5280 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5281 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5282 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5283 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5284 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5285 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5286 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5287 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5288 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5291 Version 1.15.1 (2017-02-09)
5292 ===========================
5294 * [Fix IntoIter::as_mut_slice's signature][39466]
5295 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5297 [39466]: https://github.com/rust-lang/rust/pull/39466
5298 [39523]: https://github.com/rust-lang/rust/pull/39523
5301 Version 1.15.0 (2017-02-02)
5302 ===========================
5307 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5308 stable. This allows popular code-generating crates like Serde and Diesel to
5309 work ergonomically. [RFC 1681].
5310 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5311 with curly braces][36868]. Part of [RFC 1506].
5312 * [A number of minor changes to name resolution have been activated][37127].
5313 They add up to more consistent semantics, allowing for future evolution of
5314 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5315 details of what is different. The breaking changes here have been transitioned
5316 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5317 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5319 * [`?Sized` can be used in `where` clauses][37791]
5320 * [There is now a limit on the size of monomorphized types and it can be
5321 modified with the `#![type_size_limit]` crate attribute, similarly to
5322 the `#![recursion_limit]` attribute][37789]
5327 * [On Windows, the compiler will apply dllimport attributes when linking to
5328 extern functions][37973]. Additional attributes and flags can control which
5329 library kind is linked and its name. [RFC 1717].
5330 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5331 * [The `--test` flag works with procedural macro crates][38107]
5332 * [Fix `extern "aapcs" fn` ABI][37814]
5333 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5334 * [The `format!` expander recognizes incorrect `printf` and shell-style
5335 formatting directives and suggests the correct format][37613].
5336 * [Only report one error for all unused imports in an import list][37456]
5338 Compiler Performance
5339 --------------------
5341 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5342 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5343 * [Don't clone in `UnificationTable::probe`][37848]
5344 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5345 * [Use small vectors in type walker][37760]
5346 * [Macro expansion performance was improved][37701]
5347 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5348 * [Replace FNV with a faster hash function][37229]
5353 * [`std::iter::Iterator::min_by`]
5354 * [`std::iter::Iterator::max_by`]
5355 * [`std::os::*::fs::FileExt`]
5356 * [`std::sync::atomic::Atomic*::get_mut`]
5357 * [`std::sync::atomic::Atomic*::into_inner`]
5358 * [`std::vec::IntoIter::as_slice`]
5359 * [`std::vec::IntoIter::as_mut_slice`]
5360 * [`std::sync::mpsc::Receiver::try_iter`]
5361 * [`std::os::unix::process::CommandExt::before_exec`]
5362 * [`std::rc::Rc::strong_count`]
5363 * [`std::rc::Rc::weak_count`]
5364 * [`std::sync::Arc::strong_count`]
5365 * [`std::sync::Arc::weak_count`]
5366 * [`std::char::encode_utf8`]
5367 * [`std::char::encode_utf16`]
5368 * [`std::cell::Ref::clone`]
5369 * [`std::io::Take::into_inner`]
5374 * [The standard sorting algorithm has been rewritten for dramatic performance
5375 improvements][38192]. It is a hybrid merge sort, drawing influences from
5376 Timsort. Previously it was a naive merge sort.
5377 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5378 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5380 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5381 and `char_indices().last()`][37882]
5382 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5383 * [Chinese characters display correctly in `fmt::Debug`][37855]
5384 * [Derive `Default` for `Duration`][37699]
5385 * [Support creation of anonymous pipes on WinXP/2k][37677]
5386 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5387 * [Don't pass overlapped handles to processes][38835]
5392 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5393 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5394 should instead check the variable at runtime with `std::env`. That the value
5395 was set at build time was a bug, and incorrect when cross-compiling. This
5396 change is known to cause breakage.
5397 * [Add `--all` flag to `cargo test`][cargo/3221]
5398 * [Compile statically against the MSVC CRT][cargo/3363]
5399 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5400 * [Link OpenSSL statically on OSX][cargo/3311]
5401 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5402 * [Test for bad path overrides with summaries][cargo/3336]
5403 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5404 * [Fix retrying crate downloads for network errors][cargo/3348]
5405 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5406 * [Emit more info on --message-format=json][cargo/3319]
5407 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5408 * [Don't ignore errors in workspace manifest][cargo/3409]
5409 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5414 * [Test runners (binaries built with `--test`) now support a `--list` argument
5415 that lists the tests it contains][38185]
5416 * [Test runners now support a `--exact` argument that makes the test filter
5417 match exactly, instead of matching only a substring of the test name][38181]
5418 * [rustdoc supports a `--playground-url` flag][37763]
5419 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5424 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5425 continue to be used in this release by passing `--disable-rustbuild` to the
5426 configure script, but they will be deleted soon. Note that the new build
5427 system uses a different on-disk layout that will likely affect any scripts
5429 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5431 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5432 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5438 * [A number of minor changes to name resolution have been activated][37127].
5439 They add up to more consistent semantics, allowing for future evolution of
5440 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5441 details of what is different. The breaking changes here have been transitioned
5442 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5443 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5444 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5445 should instead check the variable at runtime with `std::env`. That the value
5446 was set at build time was a bug, and incorrect when cross-compiling. This
5447 change is known to cause breakage.
5448 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5449 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5450 1.10 and is now an error by default. It will become a hard error in the near
5452 * [The semantics relating modules to file system directories are changing in
5453 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5454 lint, which is a warning in this release, and will become a hard error in the
5456 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5457 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5458 the underlying iterator][37834]
5460 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5461 [33685]: https://github.com/rust-lang/rust/issues/33685
5462 [36868]: https://github.com/rust-lang/rust/pull/36868
5463 [37127]: https://github.com/rust-lang/rust/pull/37127
5464 [37229]: https://github.com/rust-lang/rust/pull/37229
5465 [37456]: https://github.com/rust-lang/rust/pull/37456
5466 [37527]: https://github.com/rust-lang/rust/pull/37527
5467 [37602]: https://github.com/rust-lang/rust/pull/37602
5468 [37613]: https://github.com/rust-lang/rust/pull/37613
5469 [37615]: https://github.com/rust-lang/rust/pull/37615
5470 [37636]: https://github.com/rust-lang/rust/pull/37636
5471 [37627]: https://github.com/rust-lang/rust/pull/37627
5472 [37642]: https://github.com/rust-lang/rust/pull/37642
5473 [37677]: https://github.com/rust-lang/rust/pull/37677
5474 [37699]: https://github.com/rust-lang/rust/pull/37699
5475 [37701]: https://github.com/rust-lang/rust/pull/37701
5476 [37705]: https://github.com/rust-lang/rust/pull/37705
5477 [37749]: https://github.com/rust-lang/rust/pull/37749
5478 [37760]: https://github.com/rust-lang/rust/pull/37760
5479 [37763]: https://github.com/rust-lang/rust/pull/37763
5480 [37764]: https://github.com/rust-lang/rust/pull/37764
5481 [37789]: https://github.com/rust-lang/rust/pull/37789
5482 [37791]: https://github.com/rust-lang/rust/pull/37791
5483 [37814]: https://github.com/rust-lang/rust/pull/37814
5484 [37817]: https://github.com/rust-lang/rust/pull/37817
5485 [37834]: https://github.com/rust-lang/rust/pull/37834
5486 [37848]: https://github.com/rust-lang/rust/pull/37848
5487 [37855]: https://github.com/rust-lang/rust/pull/37855
5488 [37882]: https://github.com/rust-lang/rust/pull/37882
5489 [37888]: https://github.com/rust-lang/rust/pull/37888
5490 [37973]: https://github.com/rust-lang/rust/pull/37973
5491 [37979]: https://github.com/rust-lang/rust/pull/37979
5492 [38086]: https://github.com/rust-lang/rust/pull/38086
5493 [38107]: https://github.com/rust-lang/rust/pull/38107
5494 [38117]: https://github.com/rust-lang/rust/pull/38117
5495 [38134]: https://github.com/rust-lang/rust/pull/38134
5496 [38146]: https://github.com/rust-lang/rust/pull/38146
5497 [38181]: https://github.com/rust-lang/rust/pull/38181
5498 [38182]: https://github.com/rust-lang/rust/pull/38182
5499 [38185]: https://github.com/rust-lang/rust/pull/38185
5500 [38192]: https://github.com/rust-lang/rust/pull/38192
5501 [38279]: https://github.com/rust-lang/rust/pull/38279
5502 [38835]: https://github.com/rust-lang/rust/pull/38835
5503 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5504 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5505 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5506 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5507 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5508 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5509 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5510 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5511 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5512 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5513 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5514 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5515 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5516 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5517 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5518 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5519 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5520 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5521 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5522 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5523 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5524 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5525 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5526 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5527 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5528 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5529 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5530 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5531 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5532 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5533 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5534 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5535 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5536 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5537 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5538 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5539 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5540 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5543 Version 1.14.0 (2016-12-22)
5544 ===========================
5549 * [`..` matches multiple tuple fields in enum variants, structs
5550 and tuples][36843]. [RFC 1492].
5551 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5552 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5553 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5554 dereferencing][36822]
5559 * [Mark enums with non-zero discriminant as non-zero][37224]
5560 * [Lower-case `static mut` names are linted like other
5561 statics and consts][37162]
5562 * [Fix ICE on some macros in const integer positions
5563 (e.g. `[u8; m!()]`)][36819]
5564 * [Improve error message and snippet for "did you mean `x`"][36798]
5565 * [Add a panic-strategy field to the target specification][36794]
5566 * [Include LLVM version in `--version --verbose`][37200]
5568 Compile-time Optimizations
5569 --------------------------
5571 * [Improve macro expansion performance][37569]
5572 * [Shrink `Expr_::ExprInlineAsm`][37445]
5573 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5574 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5575 * [Avoid more allocations when compiling html5ever][37373]
5576 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5577 * [Avoid some allocations in the macro parser][37318]
5578 * [Use a faster deflate setting][37298]
5579 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5580 during interning of slices][37270]
5581 * [Optimize `write_metadata`][37267]
5582 * [Don't process obligation forest cycles when stalled][37231]
5583 * [Avoid many `CrateConfig` clones][37161]
5584 * [Optimize `Substs::super_fold_with`][37108]
5585 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5586 * [Speed up `plug_leaks`][36917]
5591 * [`println!()`, with no arguments, prints newline][36825].
5592 Previously, an empty string was required to achieve the same.
5593 * [`Wrapping` impls standard binary and unary operators, as well as
5594 the `Sum` and `Product` iterators][37356]
5595 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5597 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5598 `VecDeque` iterators][37315]
5599 * [Improve `SipHasher` performance on small values][37312]
5600 * [Add Iterator trait TrustedLen to enable better FromIterator /
5602 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5603 * [`ReadDir` implements `Debug`][37221]
5604 * [Implement `RefUnwindSafe` for atomic types][37178]
5605 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5606 * [Avoid allocations in `Decoder::read_str`][37064]
5607 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5608 * [Impl `Debug` for raw pointers to unsized data][36880]
5609 * [Don't reuse `HashMap` random seeds][37470]
5610 * [The internal memory layout of `HashMap` is more cache-friendly, for
5611 significant improvements in some operations][36692]
5612 * [`HashMap` uses less memory on 32-bit architectures][36595]
5613 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5618 * [Expose rustc cfg values to build scripts][cargo/3243]
5619 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5620 * [Fix passing --features when testing multiple packages][cargo/3280]
5621 * [Use a single profile set per workspace][cargo/3249]
5622 * [Load `replace` sections from lock files][cargo/3220]
5623 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5628 * [rustup is the recommended Rust installation method][1.14rustup]
5629 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5630 S390x. These are [tier 2] platforms and may have major defects. Follow the
5631 instructions on the website to install, or add the targets to an existing
5632 installation with `rustup target add`. The new target triples are:
5633 - `mips-unknown-linux-gnu`
5634 - `mipsel-unknown-linux-gnu`
5635 - `mips64-unknown-linux-gnuabi64`
5636 - `mips64el-unknown-linux-gnuabi64 `
5637 - `powerpc-unknown-linux-gnu`
5638 - `powerpc64-unknown-linux-gnu`
5639 - `powerpc64le-unknown-linux-gnu`
5640 - `s390x-unknown-linux-gnu `
5641 * This release includes target (std) builds for ARM Linux running MUSL
5642 libc. These are [tier 2] platforms and may have major defects. Add the
5643 following triples to an existing rustup installation with `rustup target add`:
5644 - `arm-unknown-linux-musleabi`
5645 - `arm-unknown-linux-musleabihf`
5646 - `armv7-unknown-linux-musleabihf`
5647 * This release includes [experimental support for WebAssembly][1.14wasm], via
5648 the `wasm32-unknown-emscripten` target. This target is known to have major
5649 defects. Please test, report, and fix.
5650 * rustup no longer installs documentation by default. Run `rustup
5651 component add rust-docs` to install.
5652 * [Fix line stepping in debugger][37310]
5653 * [Enable line number debuginfo in releases][37280]
5658 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5659 * [Add support for Fuchsia OS][37313]
5660 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5665 * [A number of forward-compatibility lints used by the compiler
5666 to gradually introduce language changes have been converted
5667 to deny by default][36894]:
5668 - ["use of inaccessible extern crate erroneously allowed"][36886]
5669 - ["type parameter default erroneously allowed in invalid location"][36887]
5670 - ["detects super or self keywords at the beginning of global path"][36888]
5671 - ["two overlapping inherent impls define an item with the same name
5672 were erroneously allowed"][36889]
5673 - ["floating-point constants cannot be used in patterns"][36890]
5674 - ["constants of struct or enum type can only be used in a pattern if
5675 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5676 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5677 * [Prohibit patterns in trait methods without bodies][37378]
5678 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5679 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5680 * [The `$crate` macro variable is accepted in fewer locations][37213]
5681 * [Impls specifying extra region requirements beyond the trait
5682 they implement are rejected][37167]
5683 * [Enums may not be unsized][37111]. Unsized enums are intended to
5684 work but never have. For now they are forbidden.
5685 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5687 [tier 2]: https://forge.rust-lang.org/platform-support.html
5688 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5689 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5690 [36430]: https://github.com/rust-lang/rust/pull/36430
5691 [36595]: https://github.com/rust-lang/rust/pull/36595
5692 [36595]: https://github.com/rust-lang/rust/pull/36595
5693 [36692]: https://github.com/rust-lang/rust/pull/36692
5694 [36767]: https://github.com/rust-lang/rust/pull/36767
5695 [36794]: https://github.com/rust-lang/rust/pull/36794
5696 [36798]: https://github.com/rust-lang/rust/pull/36798
5697 [36819]: https://github.com/rust-lang/rust/pull/36819
5698 [36822]: https://github.com/rust-lang/rust/pull/36822
5699 [36825]: https://github.com/rust-lang/rust/pull/36825
5700 [36843]: https://github.com/rust-lang/rust/pull/36843
5701 [36880]: https://github.com/rust-lang/rust/pull/36880
5702 [36886]: https://github.com/rust-lang/rust/issues/36886
5703 [36887]: https://github.com/rust-lang/rust/issues/36887
5704 [36888]: https://github.com/rust-lang/rust/issues/36888
5705 [36889]: https://github.com/rust-lang/rust/issues/36889
5706 [36890]: https://github.com/rust-lang/rust/issues/36890
5707 [36891]: https://github.com/rust-lang/rust/issues/36891
5708 [36892]: https://github.com/rust-lang/rust/issues/36892
5709 [36894]: https://github.com/rust-lang/rust/pull/36894
5710 [36917]: https://github.com/rust-lang/rust/pull/36917
5711 [36993]: https://github.com/rust-lang/rust/pull/36993
5712 [37037]: https://github.com/rust-lang/rust/pull/37037
5713 [37064]: https://github.com/rust-lang/rust/pull/37064
5714 [37094]: https://github.com/rust-lang/rust/pull/37094
5715 [37108]: https://github.com/rust-lang/rust/pull/37108
5716 [37111]: https://github.com/rust-lang/rust/pull/37111
5717 [37161]: https://github.com/rust-lang/rust/pull/37161
5718 [37162]: https://github.com/rust-lang/rust/pull/37162
5719 [37167]: https://github.com/rust-lang/rust/pull/37167
5720 [37178]: https://github.com/rust-lang/rust/pull/37178
5721 [37200]: https://github.com/rust-lang/rust/pull/37200
5722 [37213]: https://github.com/rust-lang/rust/pull/37213
5723 [37221]: https://github.com/rust-lang/rust/pull/37221
5724 [37224]: https://github.com/rust-lang/rust/pull/37224
5725 [37230]: https://github.com/rust-lang/rust/pull/37230
5726 [37231]: https://github.com/rust-lang/rust/pull/37231
5727 [37247]: https://github.com/rust-lang/rust/pull/37247
5728 [37267]: https://github.com/rust-lang/rust/pull/37267
5729 [37270]: https://github.com/rust-lang/rust/pull/37270
5730 [37273]: https://github.com/rust-lang/rust/pull/37273
5731 [37280]: https://github.com/rust-lang/rust/pull/37280
5732 [37298]: https://github.com/rust-lang/rust/pull/37298
5733 [37306]: https://github.com/rust-lang/rust/pull/37306
5734 [37310]: https://github.com/rust-lang/rust/pull/37310
5735 [37312]: https://github.com/rust-lang/rust/pull/37312
5736 [37313]: https://github.com/rust-lang/rust/pull/37313
5737 [37315]: https://github.com/rust-lang/rust/pull/37315
5738 [37318]: https://github.com/rust-lang/rust/pull/37318
5739 [37322]: https://github.com/rust-lang/rust/pull/37322
5740 [37326]: https://github.com/rust-lang/rust/pull/37326
5741 [37351]: https://github.com/rust-lang/rust/pull/37351
5742 [37356]: https://github.com/rust-lang/rust/pull/37356
5743 [37367]: https://github.com/rust-lang/rust/pull/37367
5744 [37373]: https://github.com/rust-lang/rust/pull/37373
5745 [37378]: https://github.com/rust-lang/rust/pull/37378
5746 [37389]: https://github.com/rust-lang/rust/pull/37389
5747 [37392]: https://github.com/rust-lang/rust/pull/37392
5748 [37427]: https://github.com/rust-lang/rust/pull/37427
5749 [37439]: https://github.com/rust-lang/rust/pull/37439
5750 [37445]: https://github.com/rust-lang/rust/pull/37445
5751 [37470]: https://github.com/rust-lang/rust/pull/37470
5752 [37569]: https://github.com/rust-lang/rust/pull/37569
5753 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5754 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5755 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5756 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5757 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5758 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5759 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5762 Version 1.13.0 (2016-11-10)
5763 ===========================
5768 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5769 errors, like the `try!` macro, described in [RFC 0243].
5770 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5771 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5772 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5773 * [Fix lifetime rules for 'if' conditions][36029]
5774 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5779 * [Add the `-C link-arg` argument][36574]
5780 * [Remove the old AST-based backend from rustc_trans][35764]
5781 * [Don't enable NEON by default on armv7 Linux][35814]
5782 * [Fix debug line number info for macro expansions][35238]
5783 * [Do not emit "class method" debuginfo for types that are not
5784 DICompositeType][36008]
5785 * [Warn about multiple conflicting #[repr] hints][34623]
5786 * [When sizing DST, don't double-count nested struct prefixes][36351]
5787 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5788 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5789 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5790 * [Expand macros without recursing to avoid stack overflows][36214]
5795 * [Replace macro backtraces with labeled local uses][35702]
5796 * [Improve error message for misplaced doc comments][33922]
5797 * [Buffer unix and lock windows to prevent message interleaving][35975]
5798 * [Update lifetime errors to specifically note temporaries][36171]
5799 * [Special case a few colors for Windows][36178]
5800 * [Suggest `use self` when such an import resolves][36289]
5801 * [Be more specific when type parameter shadows primitive type][36338]
5802 * Many minor improvements
5804 Compile-time Optimizations
5805 --------------------------
5807 * [Compute and cache HIR hashes at beginning][35854]
5808 * [Don't hash types in loan paths][36004]
5809 * [Cache projections in trans][35761]
5810 * [Optimize the parser's last token handling][36527]
5811 * [Only instantiate #[inline] functions in codegen units referencing
5812 them][36524]. This leads to big improvements in cases where crates export
5813 define many inline functions without using them directly.
5814 * [Lazily allocate TypedArena's first chunk][36592]
5815 * [Don't allocate during default HashSet creation][36734]
5822 * [`overflowing_abs`]
5823 * [`RefCell::try_borrow`]
5824 * [`RefCell::try_borrow_mut`]
5829 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5830 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5832 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5833 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5834 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5835 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5836 * [Use arc4rand on FreeBSD][35884]
5837 * [memrchr: Correct aligned offset computation][35969]
5838 * [Improve Demangling of Rust Symbols][36059]
5839 * [Use monotonic time in condition variables][35048]
5840 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5841 * [Implement conversion traits for `char`][35755]
5842 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5843 * [Zero first byte of CString on drop][36264]
5844 * [Inherit overflow checks for sum and product][36372]
5845 * [Add missing Eq implementations][36423]
5846 * [Implement `Debug` for `DirEntry`][36631]
5847 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5849 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5850 * [Implement more traits for `std::io::ErrorKind`][35911]
5851 * [Optimize BinaryHeap bounds checking][36072]
5852 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5853 `extend_with_element`][36355]
5854 * [Fix overflow checking in unsigned pow()][34942]
5859 * This release includes security fixes to both curl and OpenSSL.
5860 * [Fix transitive doctests when panic=abort][cargo/3021]
5861 * [Add --all-features flag to cargo][cargo/3038]
5862 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5863 * [Don't parse the home directory more than once][cargo/3078]
5864 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5865 * [Update OpenSSL to 1.0.2j][cargo/3121]
5866 * [Add license and license_file to cargo metadata output][cargo/3110]
5867 * [Make crates-io registry URL optional in config; ignore all changes to
5868 source.crates-io][cargo/3089]
5869 * [Don't download dependencies from other platforms][cargo/3123]
5870 * [Build transitive dev-dependencies when needed][cargo/3125]
5871 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5872 * [Avoid updating registry when adding existing deps][cargo/3144]
5873 * [Warn about path overrides that won't work][cargo/3136]
5874 * [Use workspaces during `cargo install`][cargo/3146]
5875 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5876 * [Add --message-format flag][cargo/3000]
5877 * [Pass target environment for rustdoc][cargo/3205]
5878 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5879 * [Update curl and curl-sys][cargo/3241]
5880 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5885 * [rustdoc: Add the `--sysroot` argument][36586]
5886 * [rustdoc: Fix a couple of issues with the search results][35655]
5887 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5888 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5889 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5894 * [Remove unmaintained style guide][35124]
5895 * [Add s390x support][36369]
5896 * [Initial work at Haiku OS support][36727]
5897 * [Add mips-uclibc targets][35734]
5898 * [Crate-ify compiler-rt into compiler-builtins][35021]
5899 * [Add rustc version info (git hash + date) to dist tarball][36213]
5900 * Many documentation improvements
5905 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5906 * [Deny (by default) transmuting from fn item types to pointer-sized
5907 types][34923]. Continuing the long transition to zero-sized fn items,
5909 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5911 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5912 * [Fix lifetime rules for 'if' conditions][36029].
5913 * [Inherit overflow checks for sum and product][36372].
5914 * [Forbid user-defined macros named "macro_rules"][36730].
5916 [33922]: https://github.com/rust-lang/rust/pull/33922
5917 [34623]: https://github.com/rust-lang/rust/pull/34623
5918 [34923]: https://github.com/rust-lang/rust/pull/34923
5919 [34942]: https://github.com/rust-lang/rust/pull/34942
5920 [34982]: https://github.com/rust-lang/rust/pull/34982
5921 [35021]: https://github.com/rust-lang/rust/pull/35021
5922 [35048]: https://github.com/rust-lang/rust/pull/35048
5923 [35074]: https://github.com/rust-lang/rust/pull/35074
5924 [35124]: https://github.com/rust-lang/rust/pull/35124
5925 [35234]: https://github.com/rust-lang/rust/pull/35234
5926 [35238]: https://github.com/rust-lang/rust/pull/35238
5927 [35354]: https://github.com/rust-lang/rust/pull/35354
5928 [35559]: https://github.com/rust-lang/rust/pull/35559
5929 [35585]: https://github.com/rust-lang/rust/pull/35585
5930 [35627]: https://github.com/rust-lang/rust/pull/35627
5931 [35655]: https://github.com/rust-lang/rust/pull/35655
5932 [35702]: https://github.com/rust-lang/rust/pull/35702
5933 [35707]: https://github.com/rust-lang/rust/pull/35707
5934 [35728]: https://github.com/rust-lang/rust/pull/35728
5935 [35734]: https://github.com/rust-lang/rust/pull/35734
5936 [35755]: https://github.com/rust-lang/rust/pull/35755
5937 [35761]: https://github.com/rust-lang/rust/pull/35761
5938 [35764]: https://github.com/rust-lang/rust/pull/35764
5939 [35814]: https://github.com/rust-lang/rust/pull/35814
5940 [35854]: https://github.com/rust-lang/rust/pull/35854
5941 [35871]: https://github.com/rust-lang/rust/pull/35871
5942 [35884]: https://github.com/rust-lang/rust/pull/35884
5943 [35911]: https://github.com/rust-lang/rust/pull/35911
5944 [35969]: https://github.com/rust-lang/rust/pull/35969
5945 [35975]: https://github.com/rust-lang/rust/pull/35975
5946 [36004]: https://github.com/rust-lang/rust/pull/36004
5947 [36008]: https://github.com/rust-lang/rust/pull/36008
5948 [36014]: https://github.com/rust-lang/rust/pull/36014
5949 [36029]: https://github.com/rust-lang/rust/pull/36029
5950 [36059]: https://github.com/rust-lang/rust/pull/36059
5951 [36072]: https://github.com/rust-lang/rust/pull/36072
5952 [36101]: https://github.com/rust-lang/rust/pull/36101
5953 [36104]: https://github.com/rust-lang/rust/pull/36104
5954 [36171]: https://github.com/rust-lang/rust/pull/36171
5955 [36173]: https://github.com/rust-lang/rust/pull/36173
5956 [36178]: https://github.com/rust-lang/rust/pull/36178
5957 [36213]: https://github.com/rust-lang/rust/pull/36213
5958 [36214]: https://github.com/rust-lang/rust/pull/36214
5959 [36264]: https://github.com/rust-lang/rust/pull/36264
5960 [36266]: https://github.com/rust-lang/rust/pull/36266
5961 [36289]: https://github.com/rust-lang/rust/pull/36289
5962 [36338]: https://github.com/rust-lang/rust/pull/36338
5963 [36351]: https://github.com/rust-lang/rust/pull/36351
5964 [36355]: https://github.com/rust-lang/rust/pull/36355
5965 [36369]: https://github.com/rust-lang/rust/pull/36369
5966 [36372]: https://github.com/rust-lang/rust/pull/36372
5967 [36423]: https://github.com/rust-lang/rust/pull/36423
5968 [36482]: https://github.com/rust-lang/rust/pull/36482
5969 [36505]: https://github.com/rust-lang/rust/pull/36505
5970 [36524]: https://github.com/rust-lang/rust/pull/36524
5971 [36527]: https://github.com/rust-lang/rust/pull/36527
5972 [36551]: https://github.com/rust-lang/rust/pull/36551
5973 [36574]: https://github.com/rust-lang/rust/pull/36574
5974 [36586]: https://github.com/rust-lang/rust/pull/36586
5975 [36592]: https://github.com/rust-lang/rust/pull/36592
5976 [36631]: https://github.com/rust-lang/rust/pull/36631
5977 [36639]: https://github.com/rust-lang/rust/pull/36639
5978 [36721]: https://github.com/rust-lang/rust/pull/36721
5979 [36727]: https://github.com/rust-lang/rust/pull/36727
5980 [36730]: https://github.com/rust-lang/rust/pull/36730
5981 [36734]: https://github.com/rust-lang/rust/pull/36734
5982 [36754]: https://github.com/rust-lang/rust/pull/36754
5983 [36995]: https://github.com/rust-lang/rust/pull/36995
5984 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5985 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5986 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5987 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5988 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5989 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5990 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5991 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5992 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5993 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5994 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5995 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5996 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5997 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5998 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5999 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6000 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6001 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6002 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6003 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6004 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6005 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6006 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6007 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6008 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6009 [rustup]: https://www.rustup.rs
6010 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6011 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6012 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6013 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6014 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6015 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6016 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6019 Version 1.12.1 (2016-10-20)
6020 ===========================
6025 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6026 * [Confusion with double negation and booleans][36856]
6027 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6028 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6029 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6030 * [Corrupted memory after updated to 1.12][36936]
6031 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6032 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6033 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6035 [36381]: https://github.com/rust-lang/rust/issues/36381
6036 [36856]: https://github.com/rust-lang/rust/issues/36856
6037 [36875]: https://github.com/rust-lang/rust/issues/36875
6038 [36924]: https://github.com/rust-lang/rust/issues/36924
6039 [36926]: https://github.com/rust-lang/rust/issues/36926
6040 [36936]: https://github.com/rust-lang/rust/issues/36936
6041 [37026]: https://github.com/rust-lang/rust/issues/37026
6042 [37112]: https://github.com/rust-lang/rust/issues/37112
6043 [37153]: https://github.com/rust-lang/rust/issues/37153
6046 Version 1.12.0 (2016-09-29)
6047 ===========================
6052 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6053 This translation pass is far simpler than the previous AST->LLVM pass, and
6054 creates opportunities to perform new optimizations directly on the MIR. It
6055 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6056 * [`rustc` presents a new, more readable error format, along with
6057 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6058 Most common editors supporting Rust have been updated to work with it. It was
6059 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6064 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6065 This translation pass is far simpler than the previous AST->LLVM pass, and
6066 creates opportunities to perform new optimizations directly on the MIR. It
6067 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6068 * [Print the Rust target name, not the LLVM target name, with
6069 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6070 * [The computation of `TypeId` is correct in some cases where it was previously
6071 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6072 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6073 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6074 `--print relocation-models`, and `--print code-models` print the available
6075 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6076 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6077 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6078 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6079 These targets produce statically-linked binaries. There are no binary release
6085 * [`rustc` presents a new, more readable error format, along with
6086 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6087 Most common editors supporting Rust have been updated to work with it. It was
6088 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6089 * [In error descriptions, references are now described in plain English,
6090 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6091 * [In error type descriptions, unknown numeric types are named `{integer}` or
6092 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6093 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6098 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6099 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6100 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6101 useful](https://github.com/rust-lang/rust/pull/34908)
6102 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6103 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6104 * [Semicolons are properly required as statement delimiters inside
6105 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6106 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6111 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6112 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6113 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6114 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6115 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6116 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6117 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6118 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6119 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6120 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6121 Both on Unix and Windows.
6122 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6123 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6124 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6125 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6126 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6127 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6128 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6129 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6134 * [The `format!` macro and friends now allow a single argument to be formatted
6135 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6136 * [The lifetime bounds on `[T]::binary_search_by` and
6137 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6138 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6139 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6140 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6141 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6142 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6143 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6144 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6145 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6146 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6147 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6148 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6149 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6150 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6151 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6152 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6153 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6154 * [`mpsc::sync_channel` `Receiver`s return any available message before
6155 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6156 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6157 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6162 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6163 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6164 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6165 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6166 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6167 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6168 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6169 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6170 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6171 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6172 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6173 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6174 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6175 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6176 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6177 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6182 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6183 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6188 * [Test binaries now support a `--test-threads` argument to specify the number
6189 of threads used to run tests, and which acts the same as the
6190 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6191 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6192 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6193 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6194 * [Rust releases now come with source packages that can be installed by rustup
6195 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6196 The resulting source code can be used by tools and IDES, located in the
6197 sysroot under `lib/rustlib/src`.
6202 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6203 * Many minor improvements to the documentation.
6204 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6209 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6210 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6211 * [When formatting strings, if "precision" is specified, the "fill",
6212 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6213 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6216 Version 1.11.0 (2016-08-18)
6217 ===========================
6222 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6223 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6224 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6225 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6230 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6231 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6232 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6233 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6234 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6235 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6236 (in libcore - previously stabilized in libstd)
6237 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6238 (in libcore - previously stabilized in libstd)
6239 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6240 (in libcore - previously stabilized in libstd)
6241 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6242 (in libcore - previously stabilized in libstd)
6243 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6244 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6245 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6246 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6251 * [The `thread_local!` macro supports multiple definitions in a single
6252 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6253 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6254 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6255 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6256 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6257 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6258 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6259 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6264 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6265 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6266 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6267 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6268 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6269 and `-vv` prints warnings for all crates.
6270 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6271 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6272 This provides room for expansion by arbitrary tools.
6273 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6274 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6275 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6276 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6277 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6278 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6279 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6284 * [Caching projections speeds up type check dramatically for some
6285 workloads](https://github.com/rust-lang/rust/pull/33816)
6286 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6287 This hasher is faster, but is believed to provide sufficient
6288 protection from collision attacks.
6289 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6294 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6295 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6296 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6297 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6298 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6303 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6304 * [When emitting debug info, rustc emits frame pointers for closures,
6305 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6306 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6307 * Many more errors have been given error codes and extended
6309 * API documentation continues to be improved, with many new examples
6314 * [rustc no longer hangs when dependencies recursively re-export
6315 submodules](https://github.com/rust-lang/rust/pull/34542)
6316 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6317 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6318 rewritten](https://github.com/rust-lang/rust/pull/33895)
6319 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6320 No targets use this yet, but it works toward AVR support.
6325 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6326 * [The new follow-set rules that place restrictions on `macro_rules!`
6327 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6328 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6329 and has been a warning since 1.10.
6330 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6331 This causes breakage in some corner cases.
6334 Version 1.10.0 (2016-07-07)
6335 ===========================
6340 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6341 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6342 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6343 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6344 * [`panic!` can be converted to a runtime abort with the
6345 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6346 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6347 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6348 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6349 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6350 Note that Cargo does not yet directly support cdylibs.
6355 * `os::windows::fs::OpenOptionsExt::access_mode`
6356 * `os::windows::fs::OpenOptionsExt::share_mode`
6357 * `os::windows::fs::OpenOptionsExt::custom_flags`
6358 * `os::windows::fs::OpenOptionsExt::attributes`
6359 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6360 * `os::unix::fs::OpenOptionsExt::custom_flags`
6361 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6362 * `Default for sync::Weak`
6363 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6364 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6365 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6366 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6367 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6368 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6369 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6370 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6371 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6372 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6373 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6374 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6375 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6376 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6377 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6378 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6379 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6380 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6381 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6382 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6383 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6384 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6385 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6386 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6387 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6388 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6389 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6390 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6391 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6392 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6393 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6394 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6395 * Read/Write/RawFd impls for `UnixStream`
6396 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6397 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6398 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6399 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6400 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6401 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6402 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6403 * RawFd impls for `UnixListener`
6404 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6405 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6406 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6407 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6408 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6409 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6410 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6411 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6412 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6413 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6414 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6415 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6416 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6417 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6418 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6419 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6420 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6421 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6422 * RawFd impls for `UnixDatagram`
6423 * `{BTree,Hash}Map::values_mut`
6424 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6429 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6430 The semantics of this minor method are subtle and probably not what
6432 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6433 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6434 will fall back to `/dev/urandom` temporarily to avoid blocking
6435 during early boot](https://github.com/rust-lang/rust/pull/33086).
6436 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6437 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6438 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6439 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6440 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6441 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6442 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6446 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6447 This controls the runtime behavior of the `panic!` macro
6448 and can be either "unwind" (the default), or "abort".
6449 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6450 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6451 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6452 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6453 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6454 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6455 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6456 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6457 By default they are retried twice, which can be customized with the
6458 `net.retry` value in `.cargo/config`.
6459 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6460 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6461 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6462 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6463 Makes it possible to install multiple crates in parallel.
6464 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6465 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6466 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6467 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6468 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6469 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6474 * [rustc memory usage was reduced by refactoring the context used for
6475 type checking](https://github.com/rust-lang/rust/pull/33425).
6476 * [Speed up creation of `HashMap`s by caching the random keys used
6477 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6478 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6479 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6480 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6481 10x faster than the previous lookup tables.
6482 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6487 * Many incremental improvements to documentation and rustdoc.
6488 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6489 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6490 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6491 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6492 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6493 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6494 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6499 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6500 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6501 * [`std` no longer prints backtraces on platforms where the running
6502 module must be loaded with `env::current_exe`, which can't be relied
6503 on](https://github.com/rust-lang/rust/pull/33554).
6504 * This release includes std binaries for the i586-unknown-linux-gnu,
6505 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6506 i586 target is for old x86 hardware without SSE2, and the armv7
6507 target is for Android running on modern ARM architectures.
6508 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6509 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6510 * [On Unix the runtime aborts by calling `libc::abort` instead of
6511 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6512 * [Rust is now bootstrapped from the previous release of Rust,
6513 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6518 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6519 * [`target_env` for Linux ARM targets is just `gnu`, not
6520 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6521 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6522 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6523 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6524 Affects how macros are parsed.
6525 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6526 * [Feature-gated attributes on macro-generated macro invocations are
6527 now rejected](https://github.com/rust-lang/rust/pull/32791).
6528 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6529 This caused some minor changes to type inference.
6532 Version 1.9.0 (2016-05-26)
6533 ==========================
6538 * The `#[deprecated]` attribute when applied to an API will generate
6539 warnings when used. The warnings may be suppressed with
6540 `#[allow(deprecated)]`. [RFC 1270].
6541 * [`fn` item types are zero sized, and each `fn` names a unique
6542 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6543 `transmute` on a `fn` type will generate a warning for a few cycles,
6544 then will be converted to an error.
6545 * [Field and method resolution understand visibility, so private
6546 fields and methods cannot prevent the proper use of public fields
6547 and methods][1.9fv].
6548 * [The parser considers unicode codepoints in the
6549 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6555 * [`std::panic::catch_unwind`] (renamed from `recover`)
6556 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6557 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6558 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6559 * [`str::is_char_boundary`]
6560 * [`<*const T>::as_ref`]
6561 * [`<*mut T>::as_ref`]
6562 * [`<*mut T>::as_mut`]
6563 * [`AsciiExt::make_ascii_uppercase`]
6564 * [`AsciiExt::make_ascii_lowercase`]
6565 * [`char::decode_utf16`]
6566 * [`char::DecodeUtf16`]
6567 * [`char::DecodeUtf16Error`]
6568 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6569 * [`BTreeSet::take`]
6570 * [`BTreeSet::replace`]
6573 * [`HashSet::replace`]
6575 * [`OsString::with_capacity`]
6576 * [`OsString::clear`]
6577 * [`OsString::capacity`]
6578 * [`OsString::reserve`]
6579 * [`OsString::reserve_exact`]
6580 * [`OsStr::is_empty`]
6582 * [`std::os::unix::thread`]
6585 * [`JoinHandleExt::as_pthread_t`]
6586 * [`JoinHandleExt::into_pthread_t`]
6587 * [`HashSet::hasher`]
6588 * [`HashMap::hasher`]
6589 * [`CommandExt::exec`]
6590 * [`File::try_clone`]
6591 * [`SocketAddr::set_ip`]
6592 * [`SocketAddr::set_port`]
6593 * [`SocketAddrV4::set_ip`]
6594 * [`SocketAddrV4::set_port`]
6595 * [`SocketAddrV6::set_ip`]
6596 * [`SocketAddrV6::set_port`]
6597 * [`SocketAddrV6::set_flowinfo`]
6598 * [`SocketAddrV6::set_scope_id`]
6599 * [`slice::copy_from_slice`]
6600 * [`ptr::read_volatile`]
6601 * [`ptr::write_volatile`]
6602 * [`OpenOptions::create_new`]
6603 * [`TcpStream::set_nodelay`]
6604 * [`TcpStream::nodelay`]
6605 * [`TcpStream::set_ttl`]
6606 * [`TcpStream::ttl`]
6607 * [`TcpStream::set_only_v6`]
6608 * [`TcpStream::only_v6`]
6609 * [`TcpStream::take_error`]
6610 * [`TcpStream::set_nonblocking`]
6611 * [`TcpListener::set_ttl`]
6612 * [`TcpListener::ttl`]
6613 * [`TcpListener::set_only_v6`]
6614 * [`TcpListener::only_v6`]
6615 * [`TcpListener::take_error`]
6616 * [`TcpListener::set_nonblocking`]
6617 * [`UdpSocket::set_broadcast`]
6618 * [`UdpSocket::broadcast`]
6619 * [`UdpSocket::set_multicast_loop_v4`]
6620 * [`UdpSocket::multicast_loop_v4`]
6621 * [`UdpSocket::set_multicast_ttl_v4`]
6622 * [`UdpSocket::multicast_ttl_v4`]
6623 * [`UdpSocket::set_multicast_loop_v6`]
6624 * [`UdpSocket::multicast_loop_v6`]
6625 * [`UdpSocket::set_multicast_ttl_v6`]
6626 * [`UdpSocket::multicast_ttl_v6`]
6627 * [`UdpSocket::set_ttl`]
6628 * [`UdpSocket::ttl`]
6629 * [`UdpSocket::set_only_v6`]
6630 * [`UdpSocket::only_v6`]
6631 * [`UdpSocket::join_multicast_v4`]
6632 * [`UdpSocket::join_multicast_v6`]
6633 * [`UdpSocket::leave_multicast_v4`]
6634 * [`UdpSocket::leave_multicast_v6`]
6635 * [`UdpSocket::take_error`]
6636 * [`UdpSocket::connect`]
6637 * [`UdpSocket::send`]
6638 * [`UdpSocket::recv`]
6639 * [`UdpSocket::set_nonblocking`]
6644 * [`std::sync::Once` is poisoned if its initialization function
6646 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6647 * [Most types implement `fmt::Debug`][1.9db].
6648 * [The default buffer size used by `BufReader` and `BufWriter` was
6649 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6650 used by other languages.
6651 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6652 `Duration` additionally implements `*=` and `/=`][1.9ta].
6653 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6654 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6655 * [`Chain` implements `BufRead`][1.9ch].
6656 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6661 * [Cargo can now run concurrently][1.9cc].
6662 * [Top-level overrides allow specific revisions of crates to be
6663 overridden through the entire crate graph][1.9ct]. This is intended
6664 to make upgrades easier for large projects, by allowing crates to be
6665 forked temporarily until they've been upgraded and republished.
6666 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6667 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6668 on the commandline][1.9cf]. `rustc` arguments can also be specified
6669 in the `build.rustflags` configuration key.
6674 * [The time complexity of comparing variables for equivalence during type
6675 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6676 to major compilation time improvement in some scenarios.
6677 * [`ToString` is specialized for `str`, giving it the same performance
6678 as `to_owned`][1.9ts].
6679 * [Spawning processes with `Command::output` no longer creates extra
6681 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6682 for C-like enums][1.9cl].
6687 * [Passing the `--quiet` flag to a test runner will produce
6688 much-abbreviated output][1.9q].
6689 * The Rust Project now publishes std binaries for the
6690 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6691 `i586-pc-windows-msvc` targets.
6696 * [`std::sync::Once` is poisoned if its initialization function
6698 * [It is illegal to define methods with the same name in overlapping
6699 inherent `impl` blocks][1.9sn].
6700 * [`fn` item types are zero sized, and each `fn` names a unique
6701 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6702 `transmute` on a `fn` type will generate a warning for a few cycles,
6703 then will be converted to an error.
6704 * [Improvements to const evaluation may trigger new errors when integer
6705 literals are out of range][1.9ce].
6708 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6709 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6710 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6711 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6712 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6713 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6714 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6715 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6716 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6717 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6718 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6719 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6720 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6721 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6722 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6723 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6724 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6725 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6726 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6727 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6728 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6729 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6730 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6731 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6732 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6733 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6734 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6735 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6736 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6737 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6738 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6739 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6740 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6741 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6742 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6743 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6744 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6745 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6746 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6747 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6748 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6749 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6750 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6751 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6752 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6753 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6754 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6755 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6756 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6757 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6758 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6759 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6760 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6761 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6762 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6763 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6764 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6765 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6766 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6767 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6768 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6769 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6770 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6771 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6772 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6773 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6774 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6775 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6776 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6777 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6778 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6779 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6780 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6781 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6782 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6783 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6784 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6785 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6786 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6787 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6788 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6789 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6790 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6791 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6792 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6793 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6794 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6795 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6796 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6797 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6798 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6799 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6800 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6801 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6802 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6803 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6804 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6805 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6806 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6807 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6808 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6809 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6810 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6811 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6812 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6813 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6814 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6815 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6816 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6817 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6820 Version 1.8.0 (2016-04-14)
6821 ==========================
6826 * Rust supports overloading of compound assignment statements like
6827 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6828 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6829 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6831 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6832 addition to the non-braced form, `struct Foo;`. [RFC 218].
6838 * [`str::encode_utf16`] (renamed from `utf16_units`)
6839 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6842 * [`ptr::drop_in_place`]
6844 * [`time::SystemTime`]
6846 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6847 * [`Instant::elapsed`]
6848 * [`SystemTime::now`]
6849 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6850 * [`SystemTime::elapsed`]
6851 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6852 * [`SystemTimeError`]
6853 * [`SystemTimeError::duration`]
6854 * Various impls for `SystemTimeError`
6856 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6857 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6858 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6859 * [The `write!` and `writeln!` macros correctly emit errors if any of
6860 their arguments can't be formatted][1.8w].
6861 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6862 * [The Unix-specific `raw` modules, which contain a number of
6863 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6864 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6865 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6866 across platforms was making it difficult to implement `std`
6867 correctly. Those that need these definitions should use the `libc`
6869 * The Unix-specific `MetadataExt` traits, including
6870 `os::unix::fs::MetadataExt`, which expose values such as inode
6871 numbers [no longer return platform-specific types][1.8r], but
6872 instead return widened integers. [RFC 1415].
6873 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6874 * [Atomic loads and stores are not volatile][1.8a].
6875 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6880 * [Inlining hash functions lead to a 3% compile-time improvement in
6881 some workloads][1.8h].
6882 * When using jemalloc, its symbols are [unprefixed so that it
6883 overrides the libc malloc implementation][1.8h]. This means that for
6884 rustc, LLVM is now using jemalloc, which results in a 6%
6885 compile-time improvement on a specific workload.
6886 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6891 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6892 i686-pc-windows-msvc is now considered a tier-1 platform.
6893 * [The `--print targets` flag prints a list of supported targets][1.8t].
6894 * [The `--print cfg` flag prints the `cfg`s defined for the current
6896 * [`rustc` can be built with an new Cargo-based build system, written
6897 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6898 build system. To enable it configure with `configure --rustbuild`.
6899 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6900 variants while also indicating the total number of missing variants
6901 if more than 3][1.8m].
6902 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6903 * The Rust Project now publishes binary releases of the standard
6904 library for a number of tier-2 targets:
6905 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6906 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6907 `x86_64-rumprun-netbsd`. These can be installed with
6908 tools such as [multirust][1.8mr].
6913 * [`cargo init` creates a new Cargo project in the current
6914 directory][1.8ci]. It is otherwise like `cargo new`.
6915 * [Cargo has configuration keys for `-v` and
6916 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6917 `[term]` section of `.cargo/config`.
6918 * [Configuration keys that evaluate to strings or integers can be set
6919 via environment variables][1.8ce]. For example the `build.jobs` key
6920 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6921 precedence over config files.
6922 * [Target-specific dependencies support Rust `cfg` syntax for
6923 describing targets][1.8cfg] so that dependencies for multiple
6924 targets can be specified together. [RFC 1361].
6925 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6926 `RUSTDOC` take precedence over the `build.target-dir`,
6927 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6928 * [The child process tree is killed on Windows when Cargo is
6930 * [The `build.target` configuration value sets the target platform,
6931 like `--target`][1.8ct].
6936 * [Unstable compiler flags have been further restricted][1.8u]. Since
6937 1.0 `-Z` flags have been considered unstable, and other flags that
6938 were considered unstable additionally required passing `-Z
6939 unstable-options` to access. Unlike unstable language and library
6940 features though, these options have been accessible on the stable
6941 release channel. Going forward, *new unstable flags will not be
6942 available on the stable release channel*, and old unstable flags
6943 will warn about their usage. In the future, all unstable flags will
6944 be unavailable on the stable release channel.
6945 * [It is no longer possible to `match` on empty enum variants using
6946 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6947 * The Unix-specific `MetadataExt` traits, including
6948 `os::unix::fs::MetadataExt`, which expose values such as inode
6949 numbers [no longer return platform-specific types][1.8r], but
6950 instead return widened integers. [RFC 1415].
6951 * [Modules sourced from the filesystem cannot appear within arbitrary
6952 blocks, but only within other modules][1.8mf].
6953 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6954 * On Unix, [stack overflow triggers a runtime abort instead of a
6956 * [`Command::spawn` and its equivalents return an error if any of
6957 its command-line arguments contain interior `NUL`s][1.8n].
6958 * [Tuple and unit enum variants from other crates are in the type
6960 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6961 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6962 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6963 instead of `foo.lib`.
6966 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6967 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6968 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6969 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6970 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6971 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6972 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6973 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6974 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6975 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6976 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6977 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6978 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6979 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6980 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6981 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6982 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6983 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6984 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6985 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6986 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6987 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6988 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6989 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6990 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6991 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6992 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6993 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6994 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6995 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6996 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6997 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6998 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6999 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7000 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7001 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7002 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7003 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7004 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7005 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7006 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7007 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7008 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7009 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7010 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7011 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7012 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7013 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7014 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7015 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7016 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7017 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7018 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7019 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7020 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7021 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7022 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7023 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7024 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7025 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7028 Version 1.7.0 (2016-03-03)
7029 ==========================
7036 * [`Path::strip_prefix`] (renamed from relative_from)
7037 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7039 * [`Ipv4Addr::is_loopback`]
7040 * [`Ipv4Addr::is_private`]
7041 * [`Ipv4Addr::is_link_local`]
7042 * [`Ipv4Addr::is_multicast`]
7043 * [`Ipv4Addr::is_broadcast`]
7044 * [`Ipv4Addr::is_documentation`]
7046 * [`Ipv6Addr::is_unspecified`]
7047 * [`Ipv6Addr::is_loopback`]
7048 * [`Ipv6Addr::is_multicast`]
7051 * [`Vec::as_mut_slice`]
7053 * [`String::as_str`]
7054 * [`String::as_mut_str`]
7056 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7058 * `<[T]>::`[`sort_by_key`]
7059 * checked, saturated, and overflowing operations
7060 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7061 * [`i32::saturating_mul`]
7062 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7063 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7064 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7065 * [`u32::saturating_mul`]
7066 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7067 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7068 * and checked, saturated, and overflowing operations for other primitive types
7070 * [`ffi::IntoStringError`]
7071 * [`CString::into_string`]
7072 * [`CString::into_bytes`]
7073 * [`CString::into_bytes_with_nul`]
7074 * `From<CString> for Vec<u8>`
7076 * [`IntoStringError::into_cstring`]
7077 * [`IntoStringError::utf8_error`]
7078 * `Error for IntoStringError`
7080 * [`std::hash::BuildHasher`]
7081 * [`BuildHasher::Hasher`]
7082 * [`BuildHasher::build_hasher`]
7083 * [`std::hash::BuildHasherDefault`]
7084 * [`HashMap::with_hasher`]
7085 * [`HashMap::with_capacity_and_hasher`]
7086 * [`HashSet::with_hasher`]
7087 * [`HashSet::with_capacity_and_hasher`]
7088 * [`std::collections::hash_map::RandomState`]
7089 * [`RandomState::new`]
7090 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7091 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7092 from bytes is faster.
7093 * [The performance of `LineWriter` (and thus `io::stdout`) was
7094 improved by using `memchr` to search for newlines][1.7m].
7095 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7096 `f64` variants were stabilized previously.
7097 * [`BTreeMap` was rewritten to use less memory and improve the performance
7098 of insertion and iteration, the latter by as much as 5x][1.7bm].
7099 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7100 covariant over their contained type][1.7bt].
7101 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7102 over their contained type][1.7ll].
7103 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7105 * [`Any` is implemented for unsized types][1.7a].
7106 * [`Hash` is implemented for `Duration`][1.7h].
7111 * [When running tests with `--test`, rustdoc will pass `--cfg`
7112 arguments to the compiler][1.7dt].
7113 * [The compiler is built with RPATH information by default][1.7rpa].
7114 This means that it will be possible to run `rustc` when installed in
7115 unusual configurations without configuring the dynamic linker search
7117 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7118 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7119 over `LD_LIBRARY_PATH`.
7124 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7125 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7126 * [The `rerun-if-changed` build script directive no longer causes the
7127 build script to incorrectly run twice in certain scenarios][1.7rr].
7132 * Soundness fixes to the interactions between associated types and
7133 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7134 code that violates the new rules. This is a significant change that
7135 is known to break existing code, so it has emitted warnings for the
7136 new error cases since 1.4 to give crate authors time to adapt. The
7137 details of what is changing are subtle; read the RFC for more.
7138 * [Several bugs in the compiler's visibility calculations were
7139 fixed][1.7v]. Since this was found to break significant amounts of
7140 code, the new errors will be emitted as warnings for several release
7141 cycles, under the `private_in_public` lint.
7142 * Defaulted type parameters were accidentally accepted in positions
7143 that were not intended. In this release, [defaulted type parameters
7144 appearing outside of type definitions will generate a
7145 warning][1.7d], which will become an error in future releases.
7146 * [Parsing "." as a float results in an error instead of 0][1.7p].
7147 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7148 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7150 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7151 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7152 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7153 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7154 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7155 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7156 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7157 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7158 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7159 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7160 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7161 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7162 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7163 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7164 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7165 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7166 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7167 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7168 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7169 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7170 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7171 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7172 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7173 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7174 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7175 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7176 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7177 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7178 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7179 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7180 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7181 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7182 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7183 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7184 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7185 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7186 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7187 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7188 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7189 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7190 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7191 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7192 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7193 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7194 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7195 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7196 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7197 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7198 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7199 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7200 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7201 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7202 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7203 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7204 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7205 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7206 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7207 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7208 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7209 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7210 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7211 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7212 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7213 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7214 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7215 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7216 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7217 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7218 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7219 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7220 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7221 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7222 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7223 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7224 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7225 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7226 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7227 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7228 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7231 Version 1.6.0 (2016-01-21)
7232 ==========================
7237 * The `#![no_std]` attribute causes a crate to not be linked to the
7238 standard library, but only the [core library][1.6co], as described
7239 in [RFC 1184]. The core library defines common types and traits but
7240 has no platform dependencies whatsoever, and is the basis for Rust
7241 software in environments that cannot support a full port of the
7242 standard library, such as operating systems. Most of the core
7243 library is now stable.
7249 [`Read::read_exact`],
7250 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7251 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7252 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7253 [`os::unix::fs::DirBuilderExt`],
7254 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7255 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7256 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7257 [`collections::hash_map::Drain`],
7258 [`collections::hash_map::HashMap::drain`],
7259 [`collections::hash_set::Drain`],
7260 [`collections::hash_set::HashSet::drain`],
7261 [`collections::binary_heap::Drain`],
7262 [`collections::binary_heap::BinaryHeap::drain`],
7263 [`Vec::extend_from_slice`] (renamed from `push_all`),
7264 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7265 [`RwLock::into_inner`],
7266 [`Iterator::min_by_key`] (renamed from `min_by`),
7267 [`Iterator::max_by_key`] (renamed from `max_by`).
7268 * The [core library][1.6co] is stable, as are most of its APIs.
7269 * [The `assert_eq!` macro supports arguments that don't implement
7270 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7272 * Several timer functions that take duration in milliseconds [are
7273 deprecated in favor of those that take `Duration`][1.6ms]. These
7274 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7275 `thread::park_timeout_ms`.
7276 * The algorithm by which `Vec` reserves additional elements was
7277 [tweaked to not allocate excessive space][1.6a] while still growing
7279 * `From` conversions are [implemented from integers to floats][1.6f]
7280 in cases where the conversion is lossless. Thus they are not
7281 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7282 or `f64`. They are also not implemented for `isize` and `usize`
7283 because the implementations would be platform-specific. `From` is
7284 also implemented from `f32` to `f64`.
7285 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7286 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7287 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7288 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7290 * Sorting slices that are already sorted [is 50% faster in some
7296 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7297 * Cargo build scripts can specify their dependencies by emitting the
7298 [`rerun-if-changed`][1.6rr] key.
7299 * crates.io will reject publication of crates with dependencies that
7300 have a wildcard version constraint. Crates with wildcard
7301 dependencies were seen to cause a variety of problems, as described
7302 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7304 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7305 release folder. A variety of artifacts that Cargo failed to clean
7306 are now correctly deleted.
7311 * The `unreachable_code` lint [warns when a function call's argument
7313 * The parser indicates [failures that may be caused by
7314 confusingly-similar Unicode characters][1.6uc]
7315 * Certain macro errors [are reported at definition time][1.6m], not
7321 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7322 environment variable when locating crates. This was a pre-cargo
7323 feature for integrating with the package manager that was
7324 accidentally never removed.
7325 * [A number of bugs were fixed in the privacy checker][1.6p] that
7326 could cause previously-accepted code to break.
7327 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7328 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7329 struct pattern syntax (`Foo(..)`) can no longer be used to match
7330 unit structs. This is a warning now, but will become an error in
7331 future releases. Patterns that share the same name as a const are
7333 * A bug was fixed that causes [rustc not to apply default type
7334 parameters][1.6xc] when resolving certain method implementations of
7335 traits defined in other crates.
7337 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7338 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7339 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7340 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7341 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7342 [1.6co]: http://doc.rust-lang.org/core/index.html
7343 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7344 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7345 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7346 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7347 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7348 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7349 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7350 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7351 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7352 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7353 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7354 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7355 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7356 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7357 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7358 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7359 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7360 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7361 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7362 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7363 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7364 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7365 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7366 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7367 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7368 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7369 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7370 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7371 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7372 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7373 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7374 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7375 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7376 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7377 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7378 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7379 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7380 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7381 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7382 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7383 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7386 Version 1.5.0 (2015-12-10)
7387 ==========================
7389 * ~700 changes, numerous bugfixes
7395 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7396 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7397 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7398 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7399 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7400 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7401 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7402 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7403 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7404 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7405 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7406 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7407 [`Path::read_link`], [`Path::symlink_metadata`],
7408 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7409 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7410 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7411 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7412 [`slice::split_first_mut`], [`slice::split_first`],
7413 [`slice::split_last_mut`], [`slice::split_last`],
7414 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7415 [`str::MatchIndices`], [`str::RMatchIndices`],
7416 [`str::match_indices`], [`str::rmatch_indices`],
7417 [`str::slice_mut_unchecked`], [`string::ParseError`].
7418 * Rust applications hosted on crates.io can be installed locally to
7419 `~/.cargo/bin` with the [`cargo install`] command. Among other
7420 things this makes it easier to augment Cargo with new subcommands:
7421 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7422 invoked as `cargo foo`.
7423 * Crates with wildcard (`*`) dependencies will [emit warnings when
7424 published][1.5w]. In 1.6 it will no longer be possible to publish
7425 crates with wildcard dependencies.
7430 * The rules determining when a particular lifetime must outlive
7431 a particular value (known as '[dropck]') have been [modified
7432 to not rely on parametricity][1.5p].
7433 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7434 and `Arc`][1.5a]. Because these smart pointer types implement
7435 `Deref`, this causes breakage in cases where the interior type
7436 contains methods of the same name.
7437 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7438 that they could drop their content. Soundness fix.
7439 * All method invocations are [properly checked][1.5wf1] for
7440 [well-formedness][1.5wf2]. Soundness fix.
7441 * Traits whose supertraits contain `Self` are [not object
7442 safe][1.5o]. Soundness fix.
7443 * Target specifications support a [`no_default_libraries`][1.5nd]
7444 setting that controls whether `-nodefaultlibs` is passed to the
7445 linker, and in turn the `is_like_windows` setting no longer affects
7446 the `-nodefaultlibs` flag.
7447 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7448 * The `#[inline]` and `#[repr]` attributes [can only appear
7449 in valid locations][1.5at].
7450 * Native libraries linked from the local crate are [passed to
7451 the linker before native libraries from upstream crates][1.5nl].
7452 * Two rarely-used attributes, `#[no_debug]` and
7453 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7454 * Negation of unsigned integers, which has been a warning for
7455 several releases, [is now behind a feature gate and will
7456 generate errors][1.5nu].
7457 * The parser accidentally accepted visibility modifiers on
7458 enum variants, a bug [which has been fixed][1.5ev].
7459 * [A bug was fixed that allowed `use` statements to import unstable
7465 * When evaluating expressions at compile-time that are not
7466 compile-time constants (const-evaluating expressions in non-const
7467 contexts), incorrect code such as overlong bitshifts and arithmetic
7468 overflow will [generate a warning instead of an error][1.5ce],
7469 delaying the error until runtime. This will allow the
7470 const-evaluator to be expanded in the future backwards-compatibly.
7471 * The `improper_ctypes` lint [no longer warns about using `isize` and
7472 `usize` in FFI][1.5ict].
7477 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7479 * `Default` is [implemented for mutable slices][1.5d].
7480 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7481 * There are now `From` conversions [between floating point
7482 types][1.5f] where the conversions are lossless.
7483 * There are now `From` conversions [between integer types][1.5i] where
7484 the conversions are lossless.
7485 * [`fs::Metadata` implements `Clone`][1.5fs].
7486 * The `parse` method [accepts a leading "+" when parsing
7488 * [`AsMut` is implemented for `Vec`][1.5am].
7489 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7490 been optimized][1.5cf] and no longer rely on the default impl.
7491 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7492 `unsafe extern "C"` function types now [implement `Clone`,
7493 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7494 `fmt::Debug` for up to 12 arguments][1.5fp].
7495 * [Dropping `Vec`s is much faster in unoptimized builds when the
7496 element types don't implement `Drop`][1.5dv].
7497 * A bug that caused in incorrect behavior when [combining `VecDeque`
7498 with zero-sized types][1.5vdz] was resolved.
7499 * [`PartialOrd` for slices is faster][1.5po].
7504 * [Crate metadata size was reduced by 20%][1.5md].
7505 * [Improvements to code generation reduced the size of libcore by 3.3
7506 MB and rustc's memory usage by 18MB][1.5m].
7507 * [Improvements to deref translation increased performance in
7508 unoptimized builds][1.5dr].
7509 * Various errors in trait resolution [are deduplicated to only be
7510 reported once][1.5te].
7511 * Rust has preliminary [support for rumprun kernels][1.5rr].
7512 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7514 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7515 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7516 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7517 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7518 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7519 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7520 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7521 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7522 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7523 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7524 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7525 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7526 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7527 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7528 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7529 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7530 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7531 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7532 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7533 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7534 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7535 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7536 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7537 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7538 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7539 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7540 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7541 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7542 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7543 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7544 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7545 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7546 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7547 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7548 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7549 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7550 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7551 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7552 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7553 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7554 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7555 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7556 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7557 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7558 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7559 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7560 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7561 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7562 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7563 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7564 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7565 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7566 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7567 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7568 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7569 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7570 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7571 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7572 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7573 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7574 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7575 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7576 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7577 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7578 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7579 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7580 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7581 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7582 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7583 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7584 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7585 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7586 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7587 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7588 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7589 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7590 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7591 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7592 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7593 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7594 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7595 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7596 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7597 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7598 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7599 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7600 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7601 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7602 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7604 Version 1.4.0 (2015-10-29)
7605 ==========================
7607 * ~1200 changes, numerous bugfixes
7612 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7613 GNU) are now supported and recommended for use.
7618 * [Several changes have been made to fix type soundness and improve
7619 the behavior of associated types][sound]. See [RFC 1214]. Although
7620 we have mostly introduced these changes as warnings this release, to
7621 become errors next release, there are still some scenarios that will
7622 see immediate breakage.
7623 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7624 line breaks in addition to `\n`][crlf].
7625 * [Loans of `'static` lifetime extend to the end of a function][stat].
7626 * [`str::parse` no longer introduces avoidable rounding error when
7627 parsing floating point numbers. Together with earlier changes to
7628 float formatting/output, "round trips" like f.to_string().parse()
7629 now preserve the value of f exactly. Additionally, leading plus
7630 signs are now accepted][fp3].
7636 * `use` statements that import multiple items [can now rename
7637 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7638 * [Binops work correctly on fat pointers][binfat].
7639 * `pub extern crate`, which does not behave as expected, [issues a
7640 warning][pec] until a better solution is found.
7645 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7646 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7647 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7648 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7649 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7650 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7651 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7652 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7653 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7654 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7655 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7656 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7657 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7658 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7659 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7660 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7661 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7662 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7664 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7665 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7666 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7667 `f64::from_str_radix`.
7668 * [Reverse-searching strings is faster with the 'two-way'
7670 * [`std::io::copy` allows `?Sized` arguments][cc].
7671 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7672 [override `count`, `nth` and `last` with an O(1)
7673 implementation][it].
7674 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7675 * [`IntoRawFd` has been added to the Unix-specific prelude,
7676 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7678 * [`Extend<String>` and `FromIterator<String` are both implemented for
7680 * [`IntoIterator` is implemented for references to `Option` and
7682 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7683 Copy`][ext] as part of [RFC 839]. This will cause type inference
7684 breakage in rare situations.
7685 * [`BinaryHeap` implements `Debug`][bh2].
7686 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7688 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7689 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7690 * [String comparison is faster][faststr].
7691 * `&mut T` where `T: std::fmt::Write` [also implements
7692 `std::fmt::Write`][mutw].
7693 * [A stable regression in `VecDeque::push_back` and other
7694 capacity-altering methods that caused panics for zero-sized types
7696 * [Function pointers implement traits for up to 12 parameters][fp2].
7701 * The compiler [no longer uses the 'morestack' feature to prevent
7702 stack overflow][mm]. Instead it uses guard pages and stack
7703 probes (though stack probes are not yet implemented on any platform
7705 * [The compiler matches traits faster when projections are involved][p].
7706 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7708 * [Cargo now displays useful information about what its doing during
7709 `cargo update`][cu].
7711 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7712 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7713 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7714 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7715 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7716 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7717 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7718 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7719 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7720 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7721 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7722 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7723 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7724 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7725 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7726 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7727 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7728 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7729 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7730 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7731 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7732 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7733 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7734 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7735 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7736 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7737 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7738 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7739 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7740 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7741 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7742 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7743 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7744 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7745 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7746 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7747 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7748 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7749 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7750 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7751 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7752 [bh2]: https://github.com/rust-lang/rust/pull/28156
7753 [binfat]: https://github.com/rust-lang/rust/pull/28270
7754 [bm]: https://github.com/rust-lang/rust/pull/28197
7755 [cc]: https://github.com/rust-lang/rust/pull/27531
7756 [crlf]: https://github.com/rust-lang/rust/pull/28034
7757 [cu]: https://github.com/rust-lang/cargo/pull/1931
7758 [d]: https://github.com/rust-lang/rust/pull/27825
7759 [dep]: https://github.com/rust-lang/rust/pull/28339
7760 [es]: https://github.com/rust-lang/rust/pull/27956
7761 [ext]: https://github.com/rust-lang/rust/pull/28094
7762 [faststr]: https://github.com/rust-lang/rust/pull/28338
7763 [ffi]: https://github.com/rust-lang/rust/pull/28779
7764 [fp]: https://github.com/rust-lang/rust/pull/28268
7765 [fp2]: https://github.com/rust-lang/rust/pull/28560
7766 [fp3]: https://github.com/rust-lang/rust/pull/27307
7767 [i]: https://github.com/rust-lang/rust/pull/27451
7768 [into2]: https://github.com/rust-lang/rust/pull/28039
7769 [it]: https://github.com/rust-lang/rust/pull/27652
7770 [mm]: https://github.com/rust-lang/rust/pull/27338
7771 [mutw]: https://github.com/rust-lang/rust/pull/28368
7772 [sound]: https://github.com/rust-lang/rust/pull/27641
7773 [p]: https://github.com/rust-lang/rust/pull/27866
7774 [pec]: https://github.com/rust-lang/rust/pull/28486
7775 [pr]: https://github.com/rust-lang/rust/pull/27896
7776 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7777 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7778 [s]: https://github.com/rust-lang/rust/pull/27474
7779 [stab]: https://github.com/rust-lang/rust/pull/28339
7780 [stat]: https://github.com/rust-lang/rust/pull/28321
7781 [vd]: https://github.com/rust-lang/rust/pull/28494
7783 Version 1.3.0 (2015-09-17)
7784 ==============================
7786 * ~900 changes, numerous bugfixes
7791 * The [new object lifetime defaults][nold] have been [turned
7792 on][nold2] after a cycle of warnings about the change. Now types
7793 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7794 being interpreted as `&'a Box<Trait+'a>` to `&'a
7795 Box<Trait+'static>`.
7796 * [The Rustonomicon][nom] is a new book in the official documentation
7797 that dives into writing unsafe Rust.
7798 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7799 timekeeping is employed by other std APIs, as well as out-of-tree
7805 * The [new object lifetime defaults][nold] have been [turned
7806 on][nold2] after a cycle of warnings about the change.
7807 * There is a known [regression][lr] in how object lifetime elision is
7808 interpreted, the proper solution for which is undetermined.
7809 * The `#[prelude_import]` attribute, an internal implementation
7810 detail, was accidentally stabilized previously. [It has been put
7811 behind the `prelude_import` feature gate][pi]. This change is
7812 believed to break no existing code.
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 thought to be broken.
7816 * The `dropck` rules, which checks that destructors can't access
7817 destroyed values, [have been updated][dropck] to match the
7818 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7819 cause some previously-compiling code to no longer build.
7824 * The [new object lifetime defaults][nold] have been [turned
7825 on][nold2] after a cycle of warnings about the change.
7826 * Semicolons may [now follow types and paths in
7827 macros](https://github.com/rust-lang/rust/pull/27000).
7828 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7829 [more sane for dynamically sized types][dst3]. Code that relied on
7830 the previous behavior is not known to exist, and suspected to be
7832 * `'static` variables [may now be recursive][st].
7833 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7834 implementations correctly.
7835 * The `dropck` rules, which checks that destructors can't access
7836 destroyed values, [have been updated][dropck] to match the
7842 * The [`Duration`] API, [has been stabilized][ds], as well as the
7843 `std::time` module, which presently contains only `Duration`.
7844 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7845 * The owned C string, [`CString`], implements [`Borrow`] and the
7846 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7847 these allow C strings to be borrowed and cloned in generic code.
7848 * [`CStr`] implements [`Debug`].
7849 * [`AtomicPtr`] implements [`Debug`].
7850 * [`Error`] trait objects [can be downcast to their concrete types][e]
7851 in many common configurations, using the [`is`], [`downcast`],
7852 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7854 * Searching for substrings now [employs the two-way algorithm][search]
7855 instead of doing a naive search. This gives major speedups to a
7856 number of methods, including [`contains`][sc], [`find`][sf],
7857 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7858 [`ends_with`][sew] are also faster.
7859 * The performance of `PartialEq` for slices is [much faster][ps].
7860 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7861 is overridden and optimized by the implementations for scalars.
7862 * The [`Hasher`] trait now has a number of specialized `write_*`
7863 methods for primitive types, for efficiency.
7864 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7865 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7866 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7867 of [`std::error::Error::cause`][iec] also delegates to the inner
7869 * [`process::Child`][pc] gained the [`id`] method, which returns a
7870 `u32` representing the platform-specific process identifier.
7871 * The [`connect`] method on slices is deprecated, replaced by the new
7872 [`join`] method (note that both of these are on the *unstable*
7873 [`SliceConcatExt`] trait, but through the magic of the prelude are
7874 available to stable code anyway).
7875 * The [`Div`] operator is implemented for [`Wrapping`] types.
7876 * [`DerefMut` is implemented for `String`][dms].
7877 * Performance of SipHash (the default hasher for `HashMap`) is
7878 [better for long data][sh].
7879 * [`AtomicPtr`] implements [`Send`].
7880 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7881 are now [specialized to use uninitialized buffers for increased
7883 * Lifetime parameters of foreign functions [are now resolved
7889 * Rust can now, with some coercion, [produce programs that run on
7890 Windows XP][xp], though XP is not considered a supported platform.
7891 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7892 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7893 recommended for use in 1.3, though should be fully-functional
7894 in the [64-bit 1.4 beta][b14].
7895 * On Fedora-based systems installation will [properly configure the
7896 dynamic linker][fl].
7897 * The compiler gained many new extended error descriptions, which can
7898 be accessed with the `--explain` flag.
7899 * The `dropck` pass, which checks that destructors can't access
7900 destroyed values, [has been rewritten][dropck]. This fixes some
7901 soundness holes, and as such will cause some previously-compiling
7902 code to no longer build.
7903 * `rustc` now uses [LLVM to write archive files where possible][ar].
7904 Eventually this will eliminate the compiler's dependency on the ar
7906 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7907 supported FreeBSD on x86_64).
7908 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7909 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7911 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7912 will kill the process instead of leaking][nlp].
7914 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7915 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7916 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7917 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7918 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7919 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7920 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7921 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7922 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7923 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7924 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7925 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7926 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7927 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7928 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7929 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7930 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7931 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7932 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7933 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7934 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7935 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7936 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7937 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7938 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7939 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7940 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7941 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7942 [ar]: https://github.com/rust-lang/rust/pull/26926
7943 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7944 [dms]: https://github.com/rust-lang/rust/pull/26241
7945 [dropck]: https://github.com/rust-lang/rust/pull/27261
7946 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7947 [ds]: https://github.com/rust-lang/rust/pull/26818
7948 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7949 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7950 [dst3]: https://github.com/rust-lang/rust/pull/27351
7951 [e]: https://github.com/rust-lang/rust/pull/24793
7952 [f]: https://github.com/rust-lang/rust/pull/26588
7953 [fb]: https://github.com/rust-lang/rust/pull/26959
7954 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7955 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7956 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7957 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7958 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7959 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7960 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7961 [lic]: https://github.com/rust-lang/rust/pull/26583
7962 [lnu]: https://github.com/rust-lang/rust/pull/27026
7963 [lr]: https://github.com/rust-lang/rust/issues/27248
7964 [lum]: https://github.com/rust-lang/rust/pull/26378
7965 [lur]: https://github.com/rust-lang/rust/pull/26783
7966 [nlp]: https://github.com/rust-lang/rust/pull/27176
7967 [nold2]: https://github.com/rust-lang/rust/pull/27045
7968 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7969 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7970 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7971 [pi]: https://github.com/rust-lang/rust/pull/26699
7972 [ps]: https://github.com/rust-lang/rust/pull/26884
7973 [rte]: https://github.com/rust-lang/rust/pull/26950
7974 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7975 [search]: https://github.com/rust-lang/rust/pull/26327
7976 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7977 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7978 [sh]: https://github.com/rust-lang/rust/pull/27280
7979 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7980 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7981 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7982 [st]: https://github.com/rust-lang/rust/pull/26630
7983 [win1]: https://github.com/rust-lang/rust/pull/26569
7984 [win2]: https://github.com/rust-lang/rust/pull/26741
7985 [win3]: https://github.com/rust-lang/rust/pull/26741
7986 [win4]: https://github.com/rust-lang/rust/pull/27210
7987 [xp]: https://github.com/rust-lang/rust/pull/26569
7989 Version 1.2.0 (2015-08-07)
7990 ==========================
7992 * ~1200 changes, numerous bugfixes
7997 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7998 like `Rc` to contain types without a fixed size, arrays and trait
7999 objects, finally enabling use of `Rc<[T]>` and completing the
8000 implementation of DST.
8001 * [Parallel codegen][parcodegen] is now working again, which can
8002 substantially speed up large builds in debug mode; It also gets
8003 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8004 jobs). It's not enabled by default, but will be "in the near
8005 future". It can be activated with the `-C codegen-units=N` flag to
8007 * This is the first release with [experimental support for linking
8008 with the MSVC linker and lib C on Windows (instead of using the GNU
8009 variants via MinGW)][win]. It is yet recommended only for the most
8010 intrepid Rustaceans.
8011 * Benchmark compilations are showing a 30% improvement in
8012 bootstrapping over 1.1.
8017 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8018 unicode case mapping, which is a previously-planned change in
8019 behavior and considered a bugfix.
8020 * [`mem::align_of`] now specifies [the *minimum alignment* for
8021 T][align], which is usually the alignment programs are interested
8022 in, and the same value reported by clang's
8023 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8025 * [The `#[packed]` attribute is no longer silently accepted by the
8026 compiler][packed]. This attribute did nothing and code that
8027 mentioned it likely did not work as intended.
8028 * Associated type defaults are [now behind the
8029 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8030 defaults *did not work*, but could be mentioned syntactically. As
8031 such this breakage has minimal impact.
8036 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8037 matching against dereferenceable values.
8042 * The [`Extend`] trait, which grows a collection from an iterator, is
8043 implemented over iterators of references, for `String`, `Vec`,
8044 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8045 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8046 * The [`iter::once`] function returns an iterator that yields a single
8047 element, and [`iter::empty`] returns an iterator that yields no
8049 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8050 over substring matches.
8051 * [`Cell`] and [`RefCell`] both implement `Eq`.
8052 * A number of methods for wrapping arithmetic are added to the
8053 integral types, [`wrapping_div`], [`wrapping_rem`],
8054 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8055 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8056 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8057 type.. It is illegal for the default arithmetic operations in Rust
8058 to overflow; the desire to wrap must be explicit.
8059 * The `{:#?}` formatting specifier [displays the alternate,
8060 pretty-printed][debugfmt] form of the `Debug` formatter. This
8061 feature was actually introduced prior to 1.0 with little
8063 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8064 for writing data to formatted strings, similar to [`io::Write`].
8065 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8066 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8067 are used by code generators to emit implementations of [`Debug`].
8068 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8069 methods that convert case, following Unicode case mapping.
8070 * It is now easier to handle poisoned locks. The [`PoisonError`]
8071 type, returned by failing lock operations, exposes `into_inner`,
8072 `get_ref`, and `get_mut`, which all give access to the inner lock
8073 guard, and allow the poisoned lock to continue to operate. The
8074 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8075 poisoned lock without attempting to take the lock.
8076 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8077 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8078 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8079 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8081 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8087 * `rustc` employs smarter heuristics for guessing at [typos].
8088 * `rustc` emits more efficient code for [no-op conversions between
8089 unsafe pointers][nop].
8090 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8091 resulting in faster compile times and smaller code.
8093 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8094 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8095 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8096 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8097 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8098 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8099 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8100 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8101 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8102 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8103 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8104 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8105 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8106 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8107 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8108 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8109 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8110 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8111 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8112 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8113 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8114 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8115 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8116 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8117 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8118 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8119 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8120 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8121 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8122 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8123 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8124 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8125 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8126 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8127 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8128 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8129 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8130 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8131 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8132 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8133 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8134 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8135 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8136 [align]: https://github.com/rust-lang/rust/pull/25646
8137 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8138 [typos]: https://github.com/rust-lang/rust/pull/26087
8139 [nop]: https://github.com/rust-lang/rust/pull/26336
8140 [fat]: https://github.com/rust-lang/rust/pull/26411
8141 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8142 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8143 [packed]: https://github.com/rust-lang/rust/pull/25541
8144 [ad]: https://github.com/rust-lang/rust/pull/27382
8145 [win]: https://github.com/rust-lang/rust/pull/25350
8147 Version 1.1.0 (2015-06-25)
8148 =========================
8150 * ~850 changes, numerous bugfixes
8155 * The [`std::fs` module has been expanded][fs] to expand the set of
8156 functionality exposed:
8157 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8158 don't incur a syscall on some platforms.
8159 * A `symlink_metadata` function has been added.
8160 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8161 access to all underlying information.
8162 * The compiler now contains extended explanations of many errors. When an error
8163 with an explanation occurs the compiler suggests using the `--explain` flag
8164 to read the explanation. Error explanations are also [available online][err-index].
8165 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8166 well as other work, the time to bootstrap the compiler decreased by
8172 * The [`str::split_whitespace`] method splits a string on unicode
8173 whitespace boundaries.
8174 * On both Windows and Unix, new extension traits provide conversion of
8175 I/O types to and from the underlying system handles. On Unix, these
8176 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8177 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8178 `TcpListener`, and `UpdSocket`. Further implementations for
8179 `std::process` will be stabilized later.
8180 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8181 Windows, symlinks can be created with
8182 `std::os::windows::symlink_dir` and
8183 `std::os::windows::symlink_file`.
8184 * The `mpsc::Receiver` type can now be converted into an iterator with
8185 `into_iter` on the [`IntoIterator`] trait.
8186 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8187 implementation of the [`From`] trait.
8188 * The `Debug` implementation for `RangeFull` [creates output that is
8189 more consistent with other implementations][rf].
8190 * [`Debug` is implemented for `File`][file].
8191 * The `Default` implementation for `Arc` [no longer requires `Sync +
8193 * [The `Iterator` methods `count`, `nth`, and `last` have been
8194 overridden for slices to have O(1) performance instead of O(n)][si].
8195 * Incorrect handling of paths on Windows has been improved in both the
8196 compiler and the standard library.
8197 * [`AtomicPtr` gained a `Default` implementation][ap].
8198 * In accordance with Rust's policy on arithmetic overflow `abs` now
8199 [panics on overflow when debug assertions are enabled][abs].
8200 * The [`Cloned`] iterator, which was accidentally left unstable for
8201 1.0 [has been stabilized][c].
8202 * The [`Incoming`] iterator, which iterates over incoming TCP
8203 connections, and which was accidentally unnamable in 1.0, [is now
8204 properly exported][inc].
8205 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8206 `sift_up` or `sift_down` panic][bh].
8207 * The [`split_off`] method of `LinkedList` [no longer corrupts
8208 the list in certain scenarios][ll].
8213 * Type checking performance [has improved notably][sk] with
8214 [multiple improvements][pre].
8215 * The compiler [suggests code changes][ch] for more errors.
8216 * rustc and it's build system have experimental support for [building
8217 toolchains against MUSL][m] instead of glibc on Linux.
8218 * The compiler defines the `target_env` cfg value, which is used for
8219 distinguishing toolchains that are otherwise for the same
8220 platform. Presently this is set to `gnu` for common GNU Linux
8221 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8222 * The [`cargo rustc`][crc] command invokes a build with custom flags
8224 * [Android executables are always position independent][pie].
8225 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8228 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8229 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8230 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8231 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8232 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8233 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8234 [rf]: https://github.com/rust-lang/rust/pull/24491
8235 [err-index]: https://doc.rust-lang.org/error-index.html
8236 [sk]: https://github.com/rust-lang/rust/pull/24615
8237 [pre]: https://github.com/rust-lang/rust/pull/25323
8238 [file]: https://github.com/rust-lang/rust/pull/24598
8239 [ch]: https://github.com/rust-lang/rust/pull/24683
8240 [arc]: https://github.com/rust-lang/rust/pull/24695
8241 [si]: https://github.com/rust-lang/rust/pull/24701
8242 [ap]: https://github.com/rust-lang/rust/pull/24834
8243 [m]: https://github.com/rust-lang/rust/pull/24777
8244 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8245 [crc]: https://github.com/rust-lang/cargo/pull/1568
8246 [pie]: https://github.com/rust-lang/rust/pull/24953
8247 [abs]: https://github.com/rust-lang/rust/pull/25441
8248 [c]: https://github.com/rust-lang/rust/pull/25496
8249 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8250 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8251 [inc]: https://github.com/rust-lang/rust/pull/25522
8252 [bh]: https://github.com/rust-lang/rust/pull/25856
8253 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8254 [ll]: https://github.com/rust-lang/rust/pull/26022
8255 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8256 [drop]: https://github.com/rust-lang/rust/pull/24935
8258 Version 1.0.0 (2015-05-15)
8259 ========================
8261 * ~1500 changes, numerous bugfixes
8266 * The vast majority of the standard library is now `#[stable]`. It is
8267 no longer possible to use unstable features with a stable build of
8269 * Many popular crates on [crates.io] now work on the stable release
8271 * Arithmetic on basic integer types now [checks for overflow in debug
8277 * Several [restrictions have been added to trait coherence][coh] in
8278 order to make it easier for upstream authors to change traits
8279 without breaking downstream code.
8280 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8281 improve error messages and macro behavior. For example, `0b1234` is
8282 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8283 * Trait bounds [are always invariant][inv], eliminating the need for
8284 the `PhantomFn` and `MarkerTrait` lang items, which have been
8286 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8287 "foo" as bar` syntax has been replaced with `extern crate foo as
8288 bar`, and Cargo now automatically translates "-" in *package* names
8289 to underscore for the crate name.
8290 * [Lifetime shadowing is an error][lt].
8291 * [`Send` no longer implies `'static`][send-rfc].
8292 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8293 `MyType::default()`.
8294 * Primitive types [now have inherent methods][prim-inherent],
8295 obviating the need for extension traits like `SliceExt`.
8296 * Methods with `Self: Sized` in their `where` clause are [considered
8297 object-safe][self-sized], allowing many extension traits like
8298 `IteratorExt` to be merged into the traits they extended.
8299 * You can now [refer to associated types][assoc-where] whose
8300 corresponding trait bounds appear only in a `where` clause.
8301 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8302 like `Send` and `Sync` are now library-defined.
8303 * A [Reflect trait][reflect] was introduced, which means that
8304 downcasting via the `Any` trait is effectively limited to concrete
8305 types. This helps retain the potentially-important "parametricity"
8306 property: generic code cannot behave differently for different type
8307 arguments except in minor ways.
8308 * The `unsafe_destructor` feature is now deprecated in favor of the
8309 [new `dropck`][dropck]. This change is a major reduction in unsafe
8315 * The `thread_local` module [has been renamed to `std::thread`][th].
8316 * The methods of `IteratorExt` [have been moved to the `Iterator`
8318 * Several traits that implement Rust's conventions for type
8319 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8320 [centralized in the `std::convert` module][con].
8321 * The `FromError` trait [was removed in favor of `From`][fe].
8322 * The basic sleep function [has moved to
8323 `std::thread::sleep_ms`][slp].
8324 * The `splitn` function now takes an `n` parameter that represents the
8325 number of items yielded by the returned iterator [instead of the
8326 number of 'splits'][spl].
8327 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8328 * [Derived implementations of `PartialOrd` now order enums according
8329 to their explicitly-assigned discriminants][po].
8330 * [Methods for searching strings are generic over `Pattern`s][pat],
8331 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8333 * [In method resolution, object methods are resolved before inherent
8335 * [`String::from_str` has been deprecated in favor of the `From` impl,
8336 `String::from`][sf].
8337 * [`io::Error` implements `Sync`][ios].
8338 * [The `words` method on `&str` has been replaced with
8339 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8341 * The new path and IO modules are complete and `#[stable]`. This
8342 was the major library focus for this cycle.
8343 * The path API was [revised][path-normalize] to normalize `.`,
8344 adjusting the tradeoffs in favor of the most common usage.
8345 * A large number of remaining APIs in `std` were also stabilized
8346 during this cycle; about 75% of the non-deprecated API surface
8348 * The new [string pattern API][string-pattern] landed, which makes
8349 the string slice API much more internally consistent and flexible.
8350 * A new set of [generic conversion traits][conversion] replaced
8351 many existing ad hoc traits.
8352 * Generic numeric traits were [completely removed][num-traits]. This
8353 was made possible thanks to inherent methods for primitive types,
8354 and the removal gives maximal flexibility for designing a numeric
8355 hierarchy in the future.
8356 * The `Fn` traits are now related via [inheritance][fn-inherit]
8357 and provide ergonomic [blanket implementations][fn-blanket].
8358 * The `Index` and `IndexMut` traits were changed to
8359 [take the index by value][index-value], enabling code like
8360 `hash_map["string"]` to work.
8361 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8362 `Copy` data is known to be `Clone` as well.
8367 * Many errors now have extended explanations that can be accessed with
8368 the `--explain` flag to `rustc`.
8369 * Many new examples have been added to the standard library
8371 * rustdoc has received a number of improvements focused on completion
8373 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8374 * Much headway was made on ecosystem-wide CI, making it possible
8375 to [compare builds for breakage][ci-compare].
8378 [crates.io]: http://crates.io
8379 [clo]: https://github.com/rust-lang/rust/pull/24034
8380 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8381 [con]: https://github.com/rust-lang/rust/pull/23875
8382 [cr]: https://github.com/rust-lang/rust/pull/23419
8383 [fe]: https://github.com/rust-lang/rust/pull/23879
8384 [ie]: https://github.com/rust-lang/rust/pull/23300
8385 [inv]: https://github.com/rust-lang/rust/pull/23938
8386 [ios]: https://github.com/rust-lang/rust/pull/24133
8387 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8388 [lt]: https://github.com/rust-lang/rust/pull/24057
8389 [meth]: https://github.com/rust-lang/rust/pull/24056
8390 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8391 [po]: https://github.com/rust-lang/rust/pull/24270
8392 [sf]: https://github.com/rust-lang/rust/pull/24517
8393 [slp]: https://github.com/rust-lang/rust/pull/23949
8394 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8395 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8396 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8397 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8398 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8399 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8400 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8401 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8402 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8403 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8404 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8405 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8406 [reflect]: https://github.com/rust-lang/rust/pull/23712
8407 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8408 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8409 [index-value]: https://github.com/rust-lang/rust/pull/23601
8410 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8411 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8412 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8413 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8414 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8415 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8418 Version 1.0.0-alpha.2 (2015-02-20)
8419 =====================================
8421 * ~1300 changes, numerous bugfixes
8425 * The various I/O modules were [overhauled][io-rfc] to reduce
8426 unnecessary abstractions and provide better interoperation with
8427 the underlying platform. The old `io` module remains temporarily
8429 * The standard library now [participates in feature gating][feat],
8430 so use of unstable libraries now requires a `#![feature(...)]`
8431 attribute. The impact of this change is [described on the
8432 forum][feat-forum]. [RFC][feat-rfc].
8436 * `for` loops [now operate on the `IntoIterator` trait][into],
8437 which eliminates the need to call `.iter()`, etc. to iterate
8438 over collections. There are some new subtleties to remember
8439 though regarding what sort of iterators various types yield, in
8440 particular that `for foo in bar { }` yields values from a move
8441 iterator, destroying the original collection. [RFC][into-rfc].
8442 * Objects now have [default lifetime bounds][obj], so you don't
8443 have to write `Box<Trait+'static>` when you don't care about
8444 storing references. [RFC][obj-rfc].
8445 * In types that implement `Drop`, [lifetimes must outlive the
8446 value][drop]. This will soon make it possible to safely
8447 implement `Drop` for types where `#[unsafe_destructor]` is now
8448 required. Read the [gorgeous RFC][drop-rfc] for details.
8449 * The fully qualified <T as Trait>::X syntax lets you set the Self
8450 type for a trait method or associated type. [RFC][ufcs-rfc].
8451 * References to types that implement `Deref<U>` now [automatically
8452 coerce to references][deref] to the dereferenced type `U`,
8453 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8454 should eliminate many unsightly uses of `&*`, as when converting
8455 from references to vectors into references to
8456 slices. [RFC][deref-rfc].
8457 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8458 `|:|`) is obsolete and closure kind is inferred from context.
8459 * [`Self` is a keyword][Self].
8463 * The `Show` and `String` formatting traits [have been
8464 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8465 their related purposes. Automatically getting a string
8466 conversion to use with `format!("{:?}", something_to_debug)` is
8467 now written `#[derive(Debug)]`.
8468 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8469 OsStr}`, provide strings in platform-specific encodings for easier
8470 interop with system APIs. [RFC][osstr-rfc].
8471 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8472 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8473 creating raw pointers.
8477 * Certain long error messages of the form 'expected foo found bar'
8478 are now [split neatly across multiple
8479 lines][multiline]. Examples in the PR.
8480 * On Unix Rust can be [uninstalled][un] by running
8481 `/usr/local/lib/rustlib/uninstall.sh`.
8482 * The `#[rustc_on_unimplemented]` attribute, requiring the
8483 'on_unimplemented' feature, lets rustc [display custom error
8484 messages when a trait is expected to be implemented for a type
8489 * Rust is tested against a [LALR grammar][lalr], which parses
8490 almost all the Rust files that rustc does.
8492 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8493 [close]: https://github.com/rust-lang/rust/pull/21843
8494 [deref]: https://github.com/rust-lang/rust/pull/21351
8495 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8496 [drop]: https://github.com/rust-lang/rust/pull/21972
8497 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8498 [feat]: https://github.com/rust-lang/rust/pull/21248
8499 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8500 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8501 [fmt]: https://github.com/rust-lang/rust/pull/21457
8502 [into]: https://github.com/rust-lang/rust/pull/20790
8503 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8504 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8505 [lalr]: https://github.com/rust-lang/rust/pull/21452
8506 [multiline]: https://github.com/rust-lang/rust/pull/19870
8507 [obj]: https://github.com/rust-lang/rust/pull/22230
8508 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8509 [onun]: https://github.com/rust-lang/rust/pull/20889
8510 [osstr]: https://github.com/rust-lang/rust/pull/21488
8511 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8512 [Self]: https://github.com/rust-lang/rust/pull/22158
8513 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8514 [un]: https://github.com/rust-lang/rust/pull/22256
8517 Version 1.0.0-alpha (2015-01-09)
8518 ==================================
8520 * ~2400 changes, numerous bugfixes
8524 * The language itself is considered feature complete for 1.0,
8525 though there will be many usability improvements and bugfixes
8526 before the final release.
8527 * Nearly 50% of the public API surface of the standard library has
8528 been declared 'stable'. Those interfaces are unlikely to change
8530 * The long-running debate over integer types has been
8531 [settled][ints]: Rust will ship with types named `isize` and
8532 `usize`, rather than `int` and `uint`, for pointer-sized
8533 integers. Guidelines will be rolled out during the alpha cycle.
8534 * Most crates that are not `std` have been moved out of the Rust
8535 distribution into the Cargo ecosystem so they can evolve
8536 separately and don't need to be stabilized as quickly, including
8537 'time', 'getopts', 'num', 'regex', and 'term'.
8538 * Documentation continues to be expanded with more API coverage, more
8539 examples, and more in-depth explanations. The guides have been
8540 consolidated into [The Rust Programming Language][trpl].
8541 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8542 * All official Rust binary installers now come with [Cargo], the
8543 Rust package manager.
8547 * Closures have been [completely redesigned][unboxed] to be
8548 implemented in terms of traits, can now be used as generic type
8549 bounds and thus monomorphized and inlined, or via an opaque
8550 pointer (boxed) as in the old system. The new system is often
8551 referred to as 'unboxed' closures.
8552 * Traits now support [associated types][assoc], allowing families
8553 of related types to be defined together and used generically in
8555 * Enum variants are [namespaced by their type names][enum].
8556 * [`where` clauses][where] provide a more versatile and attractive
8557 syntax for specifying generic bounds, though the previous syntax
8559 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8561 * Rust [no longer has a runtime][rt] of any description, and only
8562 supports OS threads, not green threads.
8563 * At long last, Rust has been overhauled for 'dynamically-sized
8564 types' ([DST]), which integrates 'fat pointers' (object types,
8565 arrays, and `str`) more deeply into the type system, making it
8567 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8568 `..j` that produce range types and which, when combined with the
8569 `Index` operator and multidispatch, leads to a convenient slice
8571 * The new range syntax revealed an ambiguity in the fixed-length
8572 array syntax, so now fixed length arrays [are written `[T;
8574 * The `Copy` trait is no longer implemented automatically. Unsafe
8575 pointers no longer implement `Sync` and `Send` so types
8576 containing them don't automatically either. `Sync` and `Send`
8577 are now 'unsafe traits' so one can "forcibly" implement them via
8578 `unsafe impl` if a type confirms to the requirements for them
8579 even though the internals do not (e.g. structs containing unsafe
8580 pointers like `Arc`). These changes are intended to prevent some
8581 footguns and are collectively known as [opt-in built-in
8582 traits][oibit] (though `Sync` and `Send` will soon become pure
8583 library types unknown to the compiler).
8584 * Operator traits now take their operands [by value][ops], and
8585 comparison traits can use multidispatch to compare one type
8586 against multiple other types, allowing e.g. `String` to be
8587 compared with `&str`.
8588 * `if let` and `while let` are no longer feature-gated.
8589 * Rust has adopted a more [uniform syntax for escaping unicode
8590 characters][unicode].
8591 * `macro_rules!` [has been declared stable][mac]. Though it is a
8592 flawed system it is sufficiently popular that it must be usable
8593 for 1.0. Effort has gone into [future-proofing][mac-future] it
8594 in ways that will allow other macro systems to be developed in
8595 parallel, and won't otherwise impact the evolution of the
8597 * The prelude has been [pared back significantly][prelude] such
8598 that it is the minimum necessary to support the most pervasive
8599 code patterns, and through [generalized where clauses][where]
8600 many of the prelude extension traits have been consolidated.
8601 * Rust's rudimentary reflection [has been removed][refl], as it
8602 incurred too much code generation for little benefit.
8603 * [Struct variants][structvars] are no longer feature-gated.
8604 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8605 known as 'higher-ranked trait bounds', this crucially allows
8606 unboxed closures to work.
8607 * Macros invocations surrounded by parens or square brackets and
8608 not terminated by a semicolon are [parsed as
8609 expressions][macros], which makes expressions like `vec![1i32,
8610 2, 3].len()` work as expected.
8611 * Trait objects now implement their traits automatically, and
8612 traits that can be coerced to objects now must be [object
8614 * Automatically deriving traits is now done with `#[derive(...)]`
8615 not `#[deriving(...)]` for [consistency with other naming
8616 conventions][derive].
8617 * Importing the containing module or enum at the same time as
8618 items or variants they contain is [now done with `self` instead
8619 of `mod`][self], as in use `foo::{self, bar}`
8620 * Glob imports are no longer feature-gated.
8621 * The `box` operator and `box` patterns have been feature-gated
8622 pending a redesign. For now unique boxes should be allocated
8623 like other containers, with `Box::new`.
8627 * A [series][coll1] of [efforts][coll2] to establish
8628 [conventions][coll3] for collections types has resulted in API
8629 improvements throughout the standard library.
8630 * New [APIs for error handling][err] provide ergonomic interop
8631 between error types, and [new conventions][err-conv] describe
8632 more clearly the recommended error handling strategies in Rust.
8633 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8634 it is easier to discuss failure in the context of error handling
8635 without making clarifications as to whether you are referring to
8636 the 'fail' macro or failure more generally.
8637 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8638 syscall when available.
8639 * The 'serialize' crate has been renamed 'rustc-serialize' and
8640 moved out of the distribution to Cargo. Although it is widely
8641 used now, it is expected to be superseded in the near future.
8642 * The `Show` formatter, typically implemented with
8643 `#[derive(Show)]` is [now requested with the `{:?}`
8644 specifier][show] and is intended for use by all types, for uses
8645 such as `println!` debugging. The new `String` formatter must be
8646 implemented by hand, uses the `{}` specifier, and is intended
8647 for full-fidelity conversions of things that can logically be
8648 represented as strings.
8652 * [Flexible target specification][flex] allows rustc's code
8653 generation to be configured to support otherwise-unsupported
8655 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8656 respective debuggers with Rust-appropriate pretty-printing.
8657 * The Windows installation of Rust is distributed with the
8658 MinGW components currently required to link binaries on that
8663 * Nullable enum optimizations have been extended to more types so
8664 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8665 space than the inner types themselves.
8666 * Work has begun on supporting AArch64.
8668 [Cargo]: https://crates.io
8669 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8670 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8671 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8672 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8673 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8674 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8675 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8676 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8677 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8678 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8679 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8680 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8681 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8682 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8683 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8684 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8685 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8686 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8687 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8688 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8689 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8690 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8691 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8692 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8693 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8694 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8695 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8696 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8697 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8698 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8699 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8700 [trpl]: https://doc.rust-lang.org/book/index.html
8701 [rbe]: http://rustbyexample.com/
8704 Version 0.12.0 (2014-10-09)
8705 =============================
8707 * ~1900 changes, numerous bugfixes
8711 * The introductory documentation (now called The Rust Guide) has
8712 been completely rewritten, as have a number of supplementary
8714 * Rust's package manager, Cargo, continues to improve and is
8715 sometimes considered to be quite awesome.
8716 * Many API's in `std` have been reviewed and updated for
8717 consistency with the in-development Rust coding
8718 guidelines. The standard library documentation tracks
8719 stabilization progress.
8720 * Minor libraries have been moved out-of-tree to the rust-lang org
8721 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8722 be installed with Cargo.
8723 * Lifetime elision allows lifetime annotations to be left off of
8724 function declarations in many common scenarios.
8725 * Rust now works on 64-bit Windows.
8728 * Indexing can be overloaded with the `Index` and `IndexMut`
8730 * The `if let` construct takes a branch only if the `let` pattern
8731 matches, currently behind the 'if_let' feature gate.
8732 * 'where clauses', a more flexible syntax for specifying trait
8733 bounds that is more aesthetic, have been added for traits and
8734 free functions. Where clauses will in the future make it
8735 possible to constrain associated types, which would be
8736 impossible with the existing syntax.
8737 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8738 the 'slicing_syntax' feature gate, and can be overloaded with
8739 the `Slice` or `SliceMut` traits.
8740 * The syntax for matching of sub-slices has been changed to use a
8741 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8742 consistency with other uses of `..` and to future-proof
8743 potential additional uses of the syntax.
8744 * The syntax for matching inclusive ranges in patterns has changed
8745 from `0..3` to `0...4` to be consistent with the exclusive range
8747 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8748 c]`) has been put behind the 'advanced_slice_patterns' feature
8749 gate and may be removed in the future.
8750 * Components of tuples and tuple structs can be extracted using
8751 the `value.0` syntax, currently behind the `tuple_indexing`
8753 * The `#[crate_id]` attribute is no longer supported; versioning
8754 is handled by the package manager.
8755 * Renaming crate imports are now written `extern crate foo as bar`
8756 instead of `extern crate bar = foo`.
8757 * Renaming use statements are now written `use foo as bar` instead
8759 * `let` and `match` bindings and argument names in macros are now
8761 * The new, more efficient, closure types ('unboxed closures') have
8762 been added under a feature gate, 'unboxed_closures'. These will
8763 soon replace the existing closure types, once higher-ranked
8764 trait lifetimes are added to the language.
8765 * `move` has been added as a keyword, for indicating closures
8766 that capture by value.
8767 * Mutation and assignment is no longer allowed in pattern guards.
8768 * Generic structs and enums can now have trait bounds.
8769 * The `Share` trait is now called `Sync` to free up the term
8770 'shared' to refer to 'shared reference' (the default reference
8772 * Dynamically-sized types have been mostly implemented,
8773 unifying the behavior of fat-pointer types with the rest of the
8775 * As part of dynamically-sized types, the `Sized` trait has been
8776 introduced, which qualifying types implement by default, and
8777 which type parameters expect by default. To specify that a type
8778 parameter does not need to be sized, write `<Sized? T>`. Most
8779 types are `Sized`, notable exceptions being unsized arrays
8780 (`[T]`) and trait types.
8781 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8782 * Lifetime bounds can now be applied to type parameters and object
8784 * The old, reference counted GC type, `Gc<T>` which was once
8785 denoted by the `@` sigil, has finally been removed. GC will be
8786 revisited in the future.
8789 * Library documentation has been improved for a number of modules.
8790 * Bit-vectors, collections::bitv has been modernized.
8791 * The url crate is deprecated in favor of
8792 http://github.com/servo/rust-url, which can be installed with
8794 * Most I/O stream types can be cloned and subsequently closed from
8796 * A `std::time::Duration` type has been added for use in I/O
8797 methods that rely on timers, as well as in the 'time' crate's
8798 `Timespec` arithmetic.
8799 * The runtime I/O abstraction layer that enabled the green thread
8800 scheduler to do non-thread-blocking I/O has been removed, along
8801 with the libuv-based implementation employed by the green thread
8802 scheduler. This will greatly simplify the future I/O work.
8803 * `collections::btree` has been rewritten to have a more
8804 idiomatic and efficient design.
8807 * rustdoc output now indicates the stability levels of API's.
8808 * The `--crate-name` flag can specify the name of the crate
8809 being compiled, like `#[crate_name]`.
8810 * The `-C metadata` specifies additional metadata to hash into
8811 symbol names, and `-C extra-filename` specifies additional
8812 information to put into the output filename, for use by the
8813 package manager for versioning.
8814 * debug info generation has continued to improve and should be
8815 more reliable under both gdb and lldb.
8816 * rustc has experimental support for compiling in parallel
8817 using the `-C codegen-units` flag.
8818 * rustc no longer encodes rpath information into binaries by
8822 * Stack usage has been optimized with LLVM lifetime annotations.
8823 * Official Rust binaries on Linux are more compatible with older
8824 kernels and distributions, built on CentOS 5.10.
8827 Version 0.11.0 (2014-07-02)
8828 ==========================
8830 * ~1700 changes, numerous bugfixes
8833 * ~[T] has been removed from the language. This type is superseded by
8835 * ~str has been removed from the language. This type is superseded by
8837 * ~T has been removed from the language. This type is superseded by the
8839 * @T has been removed from the language. This type is superseded by the
8840 standard library's std::gc::Gc<T> type.
8841 * Struct fields are now all private by default.
8842 * Vector indices and shift amounts are both required to be a `uint`
8843 instead of any integral type.
8844 * Byte character, byte string, and raw byte string literals are now all
8845 supported by prefixing the normal literal with a `b`.
8846 * Multiple ABIs are no longer allowed in an ABI string
8847 * The syntax for lifetimes on closures/procedures has been tweaked
8848 slightly: `<'a>|A, B|: 'b + K -> T`
8849 * Floating point modulus has been removed from the language; however it
8850 is still provided by a library implementation.
8851 * Private enum variants are now disallowed.
8852 * The `priv` keyword has been removed from the language.
8853 * A closure can no longer be invoked through a &-pointer.
8854 * The `use foo, bar, baz;` syntax has been removed from the language.
8855 * The transmute intrinsic no longer works on type parameters.
8856 * Statics now allow blocks/items in their definition.
8857 * Trait bounds are separated from objects with + instead of : now.
8858 * Objects can no longer be read while they are mutably borrowed.
8859 * The address of a static is now marked as insignificant unless the
8860 #[inline(never)] attribute is placed it.
8861 * The #[unsafe_destructor] attribute is now behind a feature gate.
8862 * Struct literals are no longer allowed in ambiguous positions such as
8863 if, while, match, and for..in.
8864 * Declaration of lang items and intrinsics are now feature-gated by
8866 * Integral literals no longer default to `int`, and floating point
8867 literals no longer default to `f64`. Literals must be suffixed with an
8868 appropriate type if inference cannot determine the type of the
8870 * The Box<T> type is no longer implicitly borrowed to &mut T.
8871 * Procedures are now required to not capture borrowed references.
8874 * The standard library is now a "facade" over a number of underlying
8875 libraries. This means that development on the standard library should
8876 be speedier due to smaller crates, as well as a clearer line between
8878 * A new library, libcore, lives under the standard library's facade
8879 which is Rust's "0-assumption" library, suitable for embedded and
8880 kernel development for example.
8881 * A regex crate has been added to the standard distribution. This crate
8882 includes statically compiled regular expressions.
8883 * The unwrap/unwrap_err methods on Result require a Show bound for
8884 better error messages.
8885 * The return types of the std::comm primitives have been centralized
8886 around the Result type.
8887 * A number of I/O primitives have gained the ability to time out their
8889 * A number of I/O primitives have gained the ability to close their
8890 reading/writing halves to cancel pending operations.
8891 * Reverse iterator methods have been removed in favor of `rev()` on
8892 their forward-iteration counterparts.
8893 * A bitflags! macro has been added to enable easy interop with C and
8894 management of bit flags.
8895 * A debug_assert! macro is now provided which is disabled when
8896 `--cfg ndebug` is passed to the compiler.
8897 * A graphviz crate has been added for creating .dot files.
8898 * The std::cast module has been migrated into std::mem.
8899 * The std::local_data api has been migrated from freestanding functions
8900 to being based on methods.
8901 * The Pod trait has been renamed to Copy.
8902 * jemalloc has been added as the default allocator for types.
8903 * The API for allocating memory has been changed to use proper alignment
8904 and sized deallocation
8905 * Connecting a TcpStream or binding a TcpListener is now based on a
8906 string address and a u16 port. This allows connecting to a hostname as
8908 * The Reader trait now contains a core method, read_at_least(), which
8909 correctly handles many repeated 0-length reads.
8910 * The process-spawning API is now centered around a builder-style
8912 * The :? printing qualifier has been moved from the standard library to
8913 an external libdebug crate.
8914 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8915 have been renamed to Eq/Ord.
8916 * The select/plural methods have been removed from format!. The escapes
8917 for { and } have also changed from \{ and \} to {{ and }},
8919 * The TaskBuilder API has been re-worked to be a true builder, and
8920 extension traits for spawning native/green tasks have been added.
8923 * All breaking changes to the language or libraries now have their
8924 commit message annotated with `[breaking-change]` to allow for easy
8925 discovery of breaking changes.
8926 * The compiler will now try to suggest how to annotate lifetimes if a
8927 lifetime-related error occurs.
8928 * Debug info continues to be improved greatly with general bug fixes and
8929 better support for situations like link time optimization (LTO).
8930 * Usage of syntax extensions when cross-compiling has been fixed.
8931 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8932 -fdata-sections and --gc-sections has been enabled by default
8933 * The compiler is now stricter about where it will load module files
8934 from when a module is declared via `mod foo;`.
8935 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8936 Syntax extensions are now discovered via a "plugin registrar" type
8937 which will be extended in the future to other various plugins.
8938 * Lints have been restructured to allow for dynamically loadable lints.
8939 * A number of rustdoc improvements:
8940 * The HTML output has been visually redesigned.
8941 * Markdown is now powered by hoedown instead of sundown.
8942 * Searching heuristics have been greatly improved.
8943 * The search index has been reduced in size by a great amount.
8944 * Cross-crate documentation via `pub use` has been greatly improved.
8945 * Primitive types are now hyperlinked and documented.
8946 * Documentation has been moved from static.rust-lang.org/doc to
8948 * A new sandbox, play.rust-lang.org, is available for running and
8949 sharing rust code examples on-line.
8950 * Unused attributes are now more robustly warned about.
8951 * The dead_code lint now warns about unused struct fields.
8952 * Cross-compiling to iOS is now supported.
8953 * Cross-compiling to mipsel is now supported.
8954 * Stability attributes are now inherited by default and no longer apply
8955 to intra-crate usage, only inter-crate usage.
8956 * Error message related to non-exhaustive match expressions have been
8960 Version 0.10 (2014-04-03)
8961 =========================
8963 * ~1500 changes, numerous bugfixes
8966 * A new RFC process is now in place for modifying the language.
8967 * Patterns with `@`-pointers have been removed from the language.
8968 * Patterns with unique vectors (`~[T]`) have been removed from the
8970 * Patterns with unique strings (`~str`) have been removed from the
8972 * `@str` has been removed from the language.
8973 * `@[T]` has been removed from the language.
8974 * `@self` has been removed from the language.
8975 * `@Trait` has been removed from the language.
8976 * Headers on `~` allocations which contain `@` boxes inside the type for
8977 reference counting have been removed.
8978 * The semantics around the lifetimes of temporary expressions have changed,
8979 see #3511 and #11585 for more information.
8980 * Cross-crate syntax extensions are now possible, but feature gated. See
8981 #11151 for more information. This includes both `macro_rules!` macros as
8982 well as syntax extensions such as `format!`.
8983 * New lint modes have been added, and older ones have been turned on to be
8985 * Unnecessary parentheses
8988 * Uppercase variables
8989 * Publicly visible private types
8990 * `#[deriving]` with raw pointers
8991 * Unsafe functions can no longer be coerced to closures.
8992 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8993 * The `#[simd]` attribute is now behind a feature gate.
8994 * Visibility is no longer allowed on `extern crate` statements, and
8995 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8996 * Trailing commas are now allowed in argument lists and tuple patterns.
8997 * The `do` keyword has been removed, it is now a reserved keyword.
8998 * Default type parameters have been implemented, but are feature gated.
8999 * Borrowed variables through captures in closures are now considered soundly.
9000 * `extern mod` is now `extern crate`
9001 * The `Freeze` trait has been removed.
9002 * The `Share` trait has been added for types that can be shared among
9004 * Labels in macros are now hygienic.
9005 * Expression/statement macro invocations can be delimited with `{}` now.
9006 * Treatment of types allowed in `static mut` locations has been tweaked.
9007 * The `*` and `.` operators are now overloadable through the `Deref` and
9009 * `~Trait` and `proc` no longer have `Send` bounds by default.
9010 * Partial type hints are now supported with the `_` type marker.
9011 * An `Unsafe` type was introduced for interior mutability. It is now
9012 considered undefined to transmute from `&T` to `&mut T` without using the
9014 * The #[linkage] attribute was implemented for extern statics/functions.
9015 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9016 * `Pod` was renamed to `Copy`.
9019 * The `libextra` library has been removed. It has now been decomposed into
9020 component libraries with smaller and more focused nuggets of
9021 functionality. The full list of libraries can be found on the
9022 documentation index page.
9023 * std: `std::condition` has been removed. All I/O errors are now propagated
9024 through the `Result` type. In order to assist with error handling, a
9025 `try!` macro for unwrapping errors with an early return and a lint for
9026 unused results has been added. See #12039 for more information.
9027 * std: The `vec` module has been renamed to `slice`.
9028 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9029 This will become the only growable vector in the future.
9030 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9031 are now found at `std::io::BufferedReader` instead of
9032 `std::io::buffered::BufferedReader`.
9033 * std: `print` and `println` are no longer in the prelude, the `print!` and
9034 `println!` macros are intended to be used instead.
9035 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9036 attempts to statically prevent cycles.
9037 * std: The standard distribution is adopting the policy of pushing failure
9038 to the user rather than failing in libraries. Many functions (such as
9039 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9040 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9041 deriving mode: `#[deriving(Show)]`.
9042 * std: `ToStr` is now implemented for all types implementing `Show`.
9043 * std: The formatting trait methods now take `&self` instead of `&T`
9044 * std: The `invert()` method on iterators has been renamed to `rev()`
9045 * std: `std::num` has seen a reduction in the genericity of its traits,
9046 consolidating functionality into a few core traits.
9047 * std: Backtraces are now printed on task failure if the environment
9048 variable `RUST_BACKTRACE` is present.
9049 * std: Naming conventions for iterators have been standardized. More details
9050 can be found on the wiki's style guide.
9051 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9052 still implement the function.
9053 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9054 * std: `assert_approx_eq!` has been removed
9055 * std: The `e` and `E` formatting specifiers for floats have been added to
9056 print them in exponential notation.
9057 * std: The `Times` trait has been removed
9058 * std: Indications of variance and opting out of builtin bounds is done
9059 through marker types in `std::kinds::marker` now
9060 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9061 `#[deriving(Hash)]` is now possible.
9062 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9063 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9064 * std: `Chan::new` is now `channel()`.
9065 * std: A new synchronous channel type has been implemented.
9066 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9067 * std: `hashmap` and `trie` have been moved to `libcollections`
9068 * std: `run` has been rolled into `io::process`
9069 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9070 * std: The equality and comparison traits have seen some reorganization.
9071 * std: `rand` has moved to `librand`.
9072 * std: `to_{lower,upper}case` has been implemented for `char`.
9073 * std: Logging has been moved to `liblog`.
9074 * collections: `HashMap` has been rewritten for higher performance and less
9076 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9077 it can be booted manually. The runtime guide has more information and
9079 * native: All I/O functionality except signals has been implemented.
9080 * green: Task spawning with `libgreen` has been optimized with stack caching
9081 and various trimming of code.
9082 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9083 * sync: The `extra::sync` module has been updated to modern rust (and moved
9084 to the `sync` library), tweaking and improving various interfaces while
9085 dropping redundant functionality.
9086 * sync: A new `Barrier` type has been added to the `sync` library.
9087 * sync: An efficient mutex for native and green tasks has been implemented.
9088 * serialize: The `base64` module has seen some improvement. It treats
9089 newlines better, has non-string error values, and has seen general
9091 * fourcc: A `fourcc!` macro was introduced
9092 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9093 hexadecimal literal.
9096 * `rustpkg` has been deprecated and removed from the main repository. Its
9097 replacement, `cargo`, is under development.
9098 * Nightly builds of rust are now available
9099 * The memory usage of rustc has been improved many times throughout this
9101 * The build process supports disabling rpath support for the rustc binary
9103 * Code generation has improved in some cases, giving more information to the
9104 LLVM optimization passes to enable more extensive optimizations.
9105 * Debuginfo compatibility with lldb on OSX has been restored.
9106 * The master branch is now gated on an android bot, making building for
9107 android much more reliable.
9108 * Output flags have been centralized into one `--emit` flag.
9109 * Crate type flags have been centralized into one `--crate-type` flag.
9110 * Codegen flags have been consolidated behind a `-C` flag.
9111 * Linking against outdated crates now has improved error messages.
9112 * Error messages with lifetimes will often suggest how to annotate the
9113 function to fix the error.
9114 * Many more types are documented in the standard library, and new guides
9116 * Many `rustdoc` improvements:
9117 * code blocks are syntax highlighted.
9118 * render standalone markdown files.
9119 * the --test flag tests all code blocks by default.
9120 * exported macros are displayed.
9121 * re-exported types have their documentation inlined at the location of the
9123 * search works across crates that have been rendered to the same output
9127 Version 0.9 (2014-01-09)
9128 ==========================
9130 * ~1800 changes, numerous bugfixes
9133 * The `float` type has been removed. Use `f32` or `f64` instead.
9134 * A new facility for enabling experimental features (feature gating) has
9135 been added, using the crate-level `#[feature(foo)]` attribute.
9136 * Managed boxes (@) are now behind a feature gate
9137 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9138 standard library's `Gc` or `Rc` types instead.
9139 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9140 * Jumping back to the top of a loop is now done with `continue` instead of
9142 * Strings can no longer be mutated through index assignment.
9143 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9144 hash delimiters, as in `r###"foo"###`.
9145 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9147 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9148 * `@fn`s have been removed.
9149 * `do` only works with procs in order to make it obvious what the cost
9151 * Single-element tuple-like structs can no longer be dereferenced to
9152 obtain the inner value. A more comprehensive solution for overloading
9153 the dereference operator will be provided in the future.
9154 * The `#[link(...)]` attribute has been replaced with
9155 `#[crate_id = "name#vers"]`.
9156 * Empty `impl`s must be terminated with empty braces and may not be
9157 terminated with a semicolon.
9158 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9159 no longer has any special meaning.
9160 * The old `fmt!` string formatting macro has been removed.
9161 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9162 `print!` and `println!`.
9163 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9164 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9165 `extern mod foo = "bar"` instead.
9166 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9167 * Macros can have attributes.
9168 * Macros can expand to items with attributes.
9169 * Macros can expand to multiple items.
9170 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9171 * Comments may be nested.
9172 * Values automatically coerce to trait objects they implement, without
9174 * Enum discriminants are no longer an entire word but as small as needed to
9175 contain all the variants. The `repr` attribute can be used to override
9176 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9177 `#[repr(C)]` to match C enums.
9178 * Non-string literals are not allowed in attributes (they never worked).
9179 * The FFI now supports variadic functions.
9180 * Octal numeric literals, as in `0o7777`.
9181 * The `concat!` syntax extension performs compile-time string concatenation.
9182 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9183 removed as Rust no longer uses segmented stacks.
9184 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9185 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9186 not `*`; ignoring remaining fields of a struct is also done with `..`,
9187 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9188 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9189 * `rustc` supports the "system" calling convention, which defaults to the
9190 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9192 * The `type_overflow` lint (default: warn) checks literals for overflow.
9193 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9194 * The `attribute_usage` lint (default: warn) warns about unknown
9196 * The `unknown_features` lint (default: warn) warns about unknown
9198 * The `dead_code` lint (default: warn) checks for dead code.
9199 * Rust libraries can be linked statically to one another
9200 * `#[link_args]` is behind the `link_args` feature gate.
9201 * Native libraries are now linked with `#[link(name = "foo")]`
9202 * Native libraries can be statically linked to a rust crate
9203 (`#[link(name = "foo", kind = "static")]`).
9204 * Native OS X frameworks are now officially supported
9205 (`#[link(name = "foo", kind = "framework")]`).
9206 * The `#[thread_local]` attribute creates thread-local (not task-local)
9207 variables. Currently behind the `thread_local` feature gate.
9208 * The `return` keyword may be used in closures.
9209 * Types that can be copied via a memcpy implement the `Pod` kind.
9210 * The `cfg` attribute can now be used on struct fields and enum variants.
9213 * std: The `option` and `result` API's have been overhauled to make them
9214 simpler, more consistent, and more composable.
9215 * std: The entire `std::io` module has been replaced with one that is
9216 more comprehensive and that properly interfaces with the underlying
9217 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9219 * std: `io::util` contains a number of useful implementations of
9220 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9221 `ZeroReader`, `TeeReader`.
9222 * std: The reference counted pointer type `extra::rc` moved into std.
9223 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9224 just a wrapper around it).
9225 * std: The `Either` type has been removed.
9226 * std: `fmt::Default` can be implemented for any type to provide default
9227 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9228 * std: The `rand` API continues to be tweaked.
9229 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9230 on failure in gdb, is now named `rust_fail`.
9231 * std: The `each_key` and `each_value` methods on `HashMap` have been
9232 replaced by the `keys` and `values` iterators.
9233 * std: Functions dealing with type size and alignment have moved from the
9234 `sys` module to the `mem` module.
9235 * std: The `path` module was written and API changed.
9236 * std: `str::from_utf8` has been changed to cast instead of allocate.
9237 * std: `starts_with` and `ends_with` methods added to vectors via the
9238 `ImmutableEqVector` trait, which is in the prelude.
9239 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9240 if the index is out of bounds.
9241 * std: Task failure no longer propagates between tasks, as the model was
9242 complex, expensive, and incompatible with thread-based tasks.
9243 * std: The `Any` type can be used for dynamic typing.
9244 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9246 * std: Methods that produce iterators generally do not have an `_iter`
9248 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9249 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9250 * std: `util::ignore` renamed to `prelude::drop`.
9251 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9253 * std: `vec::raw` has seen a lot of cleanup and API changes.
9254 * std: The standard library no longer includes any C++ code, and very
9255 minimal C, eliminating the dependency on libstdc++.
9256 * std: Runtime scheduling and I/O functionality has been factored out into
9257 extensible interfaces and is now implemented by two different crates:
9258 libnative, for native threading and I/O; and libgreen, for green threading
9259 and I/O. This paves the way for using the standard library in more limited
9260 embedded environments.
9261 * std: The `comm` module has been rewritten to be much faster, have a
9262 simpler, more consistent API, and to work for both native and green
9264 * std: All libuv dependencies have been moved into the rustuv crate.
9265 * native: New implementations of runtime scheduling on top of OS threads.
9266 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9268 * green: The green thread scheduler and message passing types are almost
9270 * extra: The `flatpipes` module had bitrotted and was removed.
9271 * extra: All crypto functions have been removed and Rust now has a policy of
9272 not reimplementing crypto in the standard library. In the future crypto
9273 will be provided by external crates with bindings to established libraries.
9274 * extra: `c_vec` has been modernized.
9275 * extra: The `sort` module has been removed. Use the `sort` method on
9279 * The `rust` and `rusti` commands have been removed, due to lack of
9281 * `rustdoc` was completely rewritten.
9282 * `rustdoc` can test code examples in documentation.
9283 * `rustpkg` can test packages with the argument, 'test'.
9284 * `rustpkg` supports arbitrary dependencies, including C libraries.
9285 * `rustc`'s support for generating debug info is improved again.
9286 * `rustc` has better error reporting for unbalanced delimiters.
9287 * `rustc`'s JIT support was removed due to bitrot.
9288 * Executables and static libraries can be built with LTO (-Z lto)
9289 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9293 Version 0.8 (2013-09-26)
9294 ============================
9296 * ~2200 changes, numerous bugfixes
9299 * The `for` loop syntax has changed to work with the `Iterator` trait.
9300 * At long last, unwinding works on Windows.
9301 * Default methods are ready for use.
9302 * Many trait inheritance bugs fixed.
9303 * Owned and borrowed trait objects work more reliably.
9304 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9305 * rustc can omit emission of code for the `debug!` macro if it is passed
9307 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9308 for foo.rs, then foo/mod.rs, and will generate an error when both are
9310 * Strings no longer contain trailing nulls. The new `std::c_str` module
9311 provides new mechanisms for converting to C strings.
9312 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9313 * The FFI has been overhauled such that foreign functions are called directly,
9314 instead of through a stack-switching wrapper.
9315 * Calling a foreign function must be done through a Rust function with the
9316 `#[fixed_stack_segment]` attribute.
9317 * The `externfn!` macro can be used to declare both a foreign function and
9318 a `#[fixed_stack_segment]` wrapper at once.
9319 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9320 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9321 * `priv` is disallowed everywhere except for struct fields and enum variants.
9322 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9323 * `ref` bindings in irrefutable patterns work correctly now.
9324 * `char` is now prevented from containing invalid code points.
9325 * Casting to `bool` is no longer allowed.
9326 * `\0` is now accepted as an escape in chars and strings.
9327 * `yield` is a reserved keyword.
9328 * `typeof` is a reserved keyword.
9329 * Crates may be imported by URL with `extern mod foo = "url";`.
9330 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9331 * Static vectors can be initialized with repeating elements,
9332 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9333 * Static structs can be initialized with functional record update,
9334 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9335 * `cfg!` can be used to conditionally execute code based on the crate
9336 configuration, similarly to `#[cfg(...)]`.
9337 * The `unnecessary_qualification` lint detects unneeded module
9338 prefixes (default: allow).
9339 * Arithmetic operations have been implemented on the SIMD types in
9340 `std::unstable::simd`.
9341 * Exchange allocation headers were removed, reducing memory usage.
9342 * `format!` implements a completely new, extensible, and higher-performance
9343 string formatting system. It will replace `fmt!`.
9344 * `print!` and `println!` write formatted strings (using the `format!`
9345 extension) to stdout.
9346 * `write!` and `writeln!` write formatted strings (using the `format!`
9347 extension) to the new Writers in `std::rt::io`.
9348 * The library section in which a function or static is placed may
9349 be specified with `#[link_section = "..."]`.
9350 * The `proto!` syntax extension for defining bounded message protocols
9352 * `macro_rules!` is hygienic for `let` declarations.
9353 * The `#[export_name]` attribute specifies the name of a symbol.
9354 * `unreachable!` can be used to indicate unreachable code, and fails
9358 * std: Transitioned to the new runtime, written in Rust.
9359 * std: Added an experimental I/O library, `rt::io`, based on the new
9361 * std: A new generic `range` function was added to the prelude, replacing
9362 `uint::range` and friends.
9363 * std: `range_rev` no longer exists. Since range is an iterator it can be
9364 reversed with `range(lo, hi).invert()`.
9365 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9366 renamed to `unwrap_or`.
9367 * std: The `iterator` module was renamed to `iter`.
9368 * std: Integral types now support the `checked_add`, `checked_sub`, and
9369 `checked_mul` operations for detecting overflow.
9370 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9372 * std: Methods are standardizing on conventions for casting methods:
9373 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9375 * std: The `CString` type in `c_str` provides new ways to convert to and
9377 * std: `DoubleEndedIterator` can yield elements in two directions.
9378 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9380 * std: `str::from_bytes` renamed to `str::from_utf8`.
9381 * std: `pop_opt` and `shift_opt` methods added to vectors.
9382 * std: The task-local data interface no longer uses @, and keys are
9383 no longer function pointers.
9384 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9385 * std: Added `SharedPort` to `comm`.
9386 * std: `Eq` has a default method for `ne`; only `eq` is required
9388 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9389 is required in implementations.
9390 * std: `is_utf8` performance is improved, impacting many string functions.
9391 * std: `os::MemoryMap` provides cross-platform mmap.
9392 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9393 are not 'in-bounds' are considered undefined.
9394 * std: Many freestanding functions in `vec` removed in favor of methods.
9395 * std: Many freestanding functions on scalar types removed in favor of
9397 * std: Many options to task builders were removed since they don't make
9398 sense in the new scheduler design.
9399 * std: More containers implement `FromIterator` so can be created by the
9401 * std: More complete atomic types in `unstable::atomics`.
9402 * std: `comm::PortSet` removed.
9403 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9404 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9405 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9406 default implementations.
9407 * std: Various `from_str` functions were removed in favor of a generic
9408 `from_str` which is available in the prelude.
9409 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9410 * extra: `dlist`, the doubly-linked list was modernized.
9411 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9412 * extra: Added `glob` module, replacing `std::os::glob`.
9413 * extra: `rope` was removed.
9414 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9415 * extra: `net`, and `timer` were removed. The experimental replacements
9416 are `std::rt::io::net` and `std::rt::io::timer`.
9417 * extra: Iterators implemented for `SmallIntMap`.
9418 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9419 * extra: `SmallIntSet` removed. Use `BitvSet`.
9420 * extra: Performance of JSON parsing greatly improved.
9421 * extra: `semver` updated to SemVer 2.0.0.
9422 * extra: `term` handles more terminals correctly.
9423 * extra: `dbg` module removed.
9424 * extra: `par` module removed.
9425 * extra: `future` was cleaned up, with some method renames.
9426 * extra: Most free functions in `getopts` were converted to methods.
9429 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9430 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9431 similarly to gcc's `--march` flag.
9432 * rustc's performance compiling small crates is much better.
9433 * rustpkg has received many improvements.
9434 * rustpkg supports git tags as package IDs.
9435 * rustpkg builds into target-specific directories so it can be used for
9437 * The number of concurrent test tasks is controlled by the environment
9438 variable RUST_TEST_TASKS.
9439 * The test harness can now report metrics for benchmarks.
9440 * All tools have man pages.
9441 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9442 * The runtime uses jemalloc for allocations.
9443 * Segmented stacks are temporarily disabled as part of the transition to
9444 the new runtime. Stack overflows are possible!
9445 * A new documentation backend, rustdoc_ng, is available for use. It is
9446 still invoked through the normal `rustdoc` command.
9449 Version 0.7 (2013-07-03)
9450 =======================
9452 * ~2000 changes, numerous bugfixes
9455 * `impl`s no longer accept a visibility qualifier. Put them on methods
9457 * The borrow checker has been rewritten with flow-sensitivity, fixing
9458 many bugs and inconveniences.
9459 * The `self` parameter no longer implicitly means `&'self self`,
9460 and can be explicitly marked with a lifetime.
9461 * Overloadable compound operators (`+=`, etc.) have been temporarily
9462 removed due to bugs.
9463 * The `for` loop protocol now requires `for`-iterators to return `bool`
9464 so they compose better.
9465 * The `Durable` trait is replaced with the `'static` bounds.
9466 * Trait default methods work more often.
9467 * Structs with the `#[packed]` attribute have byte alignment and
9468 no padding between fields.
9469 * Type parameters bound by `Copy` must now be copied explicitly with
9471 * It is now illegal to move out of a dereferenced unsafe pointer.
9472 * `Option<~T>` is now represented as a nullable pointer.
9473 * `@mut` does dynamic borrow checks correctly.
9474 * The `main` function is only detected at the topmost level of the crate.
9475 The `#[main]` attribute is still valid anywhere.
9476 * Struct fields may no longer be mutable. Use inherited mutability.
9477 * The `#[no_send]` attribute makes a type that would otherwise be
9479 * The `#[no_freeze]` attribute makes a type that would otherwise be
9481 * Unbounded recursion will abort the process after reaching the limit
9482 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9483 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9484 are never implicitly copyable.
9485 * `#[static_assert]` makes compile-time assertions about static bools.
9486 * At long last, 'argument modes' no longer exist.
9487 * The rarely used `use mod` statement no longer exists.
9490 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9492 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9493 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9495 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9496 and unsuffixed integer literals.
9499 * The `core` crate was renamed to `std`.
9500 * The `std` crate was renamed to `extra`.
9501 * More and improved documentation.
9502 * std: `iterator` module for external iterator objects.
9503 * Many old-style (internal, higher-order function) iterators replaced by
9504 implementations of `Iterator`.
9505 * std: Many old internal vector and string iterators,
9506 incl. `any`, `all`. removed.
9507 * std: The `finalize` method of `Drop` renamed to `drop`.
9508 * std: The `drop` method now takes `&mut self` instead of `&self`.
9509 * std: The prelude no longer re-exports any modules, only types and traits.
9510 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9511 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9512 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9513 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9514 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9515 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9516 * std: Many types implement `Clone`.
9517 * std: `path` type renamed to `Path`.
9518 * std: `mut` module and `Mut` type removed.
9519 * std: Many standalone functions removed in favor of methods and iterators
9520 in `vec`, `str`. In the future methods will also work as functions.
9521 * std: `reinterpret_cast` removed. Use `transmute`.
9522 * std: ascii string handling in `std::ascii`.
9523 * std: `Rand` is implemented for ~/@.
9524 * std: `run` module for spawning processes overhauled.
9525 * std: Various atomic types added to `unstable::atomic`.
9526 * std: Various types implement `Zero`.
9527 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9528 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9529 * std: Added `os::mkdir_recursive`.
9530 * std: Added `os::glob` function performs filesystems globs.
9531 * std: `FuzzyEq` renamed to `ApproxEq`.
9532 * std: `Map` now defines `pop` and `swap` methods.
9533 * std: `Cell` constructors converted to static methods.
9534 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9535 * extra: `flate` module moved from `std` to `extra`.
9536 * extra: `fileinput` module for iterating over a series of files.
9537 * extra: `Complex` number type and `complex` module.
9538 * extra: `Rational` number type and `rational` module.
9539 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9540 * extra: `term` uses terminfo now, is more correct.
9541 * extra: `arc` functions converted to methods.
9542 * extra: Implementation of fixed output size variations of SHA-2.
9545 * `unused_variables` lint mode for unused variables (default: warn).
9546 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9548 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9550 * `dead_assignment` lint mode for unread variables (default: warn).
9551 * `unnecessary_allocation` lint mode detects some heap allocations that are
9552 immediately borrowed so could be written without allocating (default: warn).
9553 * `missing_doc` lint mode (default: allow).
9554 * `unreachable_code` lint mode (default: warn).
9555 * The `rusti` command has been rewritten and a number of bugs addressed.
9556 * rustc outputs in color on more terminals.
9557 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9558 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9559 * Compiling with `-g` will make the binary record information about
9560 dynamic borrowcheck failures for debugging.
9561 * rustdoc has a nicer stylesheet.
9562 * Various improvements to rustdoc.
9563 * Improvements to rustpkg (see the detailed release notes).
9566 Version 0.6 (2013-04-03)
9567 ========================
9569 * ~2100 changes, numerous bugfixes
9572 * The self type parameter in traits is now spelled `Self`
9573 * The `self` parameter in trait and impl methods must now be explicitly
9574 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9575 * Static methods no longer require the `static` keyword and instead
9576 are distinguished by the lack of a `self` parameter
9577 * Replaced the `Durable` trait with the `'static` lifetime
9578 * The old closure type syntax with the trailing sigil has been
9579 removed in favor of the more consistent leading sigil
9580 * `super` is a keyword, and may be prefixed to paths
9581 * Trait bounds are separated with `+` instead of whitespace
9582 * Traits are implemented with `impl Trait for Type`
9583 instead of `impl Type: Trait`
9584 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9585 * The `export` keyword has finally been removed
9586 * The `move` keyword has been removed (see "Semantic changes")
9587 * The interior mutability qualifier on vectors, `[mut T]`, has been
9588 removed. Use `&mut [T]`, etc.
9589 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9590 * `fail` is no longer a keyword. Use `fail!()`
9591 * `assert` is no longer a keyword. Use `assert!()`
9592 * `log` is no longer a keyword. use `debug!`, etc.
9593 * 1-tuples may be represented as `(T,)`
9594 * Struct fields may no longer be `mut`. Use inherited mutability,
9595 `@mut T`, `core::mut` or `core::cell`
9596 * `extern mod { ... }` is no longer valid syntax for foreign
9597 function modules. Use extern blocks: `extern { ... }`
9598 * Newtype enums removed. Use tuple-structs.
9599 * Trait implementations no longer support visibility modifiers
9600 * Pattern matching over vectors improved and expanded
9601 * `const` renamed to `static` to correspond to lifetime name,
9602 and make room for future `static mut` unsafe mutable globals.
9603 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9604 * `Clone` implementations can be automatically generated with
9605 `#[deriving(Clone)]`
9606 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9607 instead of `foo as Bar`.
9608 * Fixed length vector types are now written as `[int, .. 3]`
9609 instead of `[int * 3]`.
9610 * Fixed length vector types can express the length as a constant
9611 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9614 * Types with owned pointers or custom destructors move by default,
9615 eliminating the `move` keyword
9616 * All foreign functions are considered unsafe
9617 * &mut is now unaliasable
9618 * Writes to borrowed @mut pointers are prevented dynamically
9620 * The name of the main function can be customized using #[main]
9621 * The default type of an inferred closure is &fn instead of @fn
9622 * `use` statements may no longer be "chained" - they cannot import
9623 identifiers imported by previous `use` statements
9624 * `use` statements are crate relative, importing from the "top"
9625 of the crate by default. Paths may be prefixed with `super::`
9626 or `self::` to change the search behavior.
9627 * Method visibility is inherited from the implementation declaration
9628 * Structural records have been removed
9629 * Many more types can be used in static items, including enums
9630 'static-lifetime pointers and vectors
9631 * Pattern matching over vectors improved and expanded
9632 * Typechecking of closure types has been overhauled to
9633 improve inference and eliminate unsoundness
9634 * Macros leave scope at the end of modules, unless that module is
9635 tagged with #[macro_escape]
9638 * Added big integers to `std::bigint`
9639 * Removed `core::oldcomm` module
9640 * Added pipe-based `core::comm` module
9641 * Numeric traits have been reorganized under `core::num`
9642 * `vec::slice` finally returns a slice
9643 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9644 * Containers reorganized around traits in `core::container`
9645 * `core::dvec` removed, `~[T]` is a drop-in replacement
9646 * `core::send_map` renamed to `core::hashmap`
9647 * `std::map` removed; replaced with `core::hashmap`
9648 * `std::treemap` reimplemented as an owned balanced tree
9649 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9650 * `core::trie` added as a fast ordered map for integer keys
9651 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9652 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9653 overload the comparison operators, whereas `TotalOrd` is used
9654 by certain container types
9657 * Replaced the 'cargo' package manager with 'rustpkg'
9658 * Added all-purpose 'rust' tool
9659 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9660 * rustc now *attempts* to offer spelling suggestions
9661 * Improved support for ARM and Android
9662 * Preliminary MIPS backend
9663 * Improved foreign function ABI implementation for x86, x86_64
9664 * Various memory usage improvements
9665 * Rust code may be embedded in foreign code under limited circumstances
9666 * Inline assembler supported by new asm!() syntax extension.
9669 Version 0.5 (2012-12-21)
9670 ===========================
9672 * ~900 changes, numerous bugfixes
9675 * Removed `<-` move operator
9676 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9677 * Removed old fixed length vector syntax - `[T]/N`
9678 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9679 * Macros may now expand to items and statements
9680 * `a.b()` is always parsed as a method call, never as a field projection
9681 * `Eq` and `IterBytes` implementations can be automatically generated
9682 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9683 * Removed the special crate language for `.rc` files
9684 * Function arguments may consist of any irrefutable pattern
9687 * `&` and `~` pointers may point to objects
9688 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9689 * Enum variants may be structs
9690 * Destructors can be added to all nominal types with the Drop trait
9691 * Structs and nullary enum variants may be constants
9692 * Values that cannot be implicitly copied are now automatically moved
9693 without writing `move` explicitly
9694 * `&T` may now be coerced to `*T`
9695 * Coercions happen in `let` statements as well as function calls
9696 * `use` statements now take crate-relative paths
9697 * The module and type namespaces have been merged so that static
9698 method names can be resolved under the trait in which they are
9701 * Improved support for language features
9702 * Trait inheritance works in many scenarios
9703 * More support for explicit self arguments in methods - `self`, `&self`
9704 `@self`, and `~self` all generally work as expected
9705 * Static methods work in more situations
9706 * Experimental: Traits may declare default methods for the implementations
9710 * New condition handling system in `core::condition`
9711 * Timsort added to `std::sort`
9712 * New priority queue, `std::priority_queue`
9713 * Pipes for serializable types, `std::flatpipes'
9714 * Serialization overhauled to be trait-based
9715 * Expanded `getopts` definitions
9716 * Moved futures to `std`
9717 * More functions are pure now
9718 * `core::comm` renamed to `oldcomm`. Still deprecated
9719 * `rustdoc` and `cargo` are libraries now
9722 * Added a preliminary REPL, `rusti`
9723 * License changed from MIT to dual MIT/APL2
9726 Version 0.4 (2012-10-15)
9727 ==========================
9729 * ~2000 changes, numerous bugfixes
9732 * All keywords are now strict and may not be used as identifiers anywhere
9733 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9734 'of', 'with', 'to', 'class'.
9735 * Classes are replaced with simpler structs
9736 * Explicit method self types
9737 * `ret` became `return` and `alt` became `match`
9738 * `import` is now `use`; `use is now `extern mod`
9739 * `extern mod { ... }` is now `extern { ... }`
9740 * `use mod` is the recommended way to import modules
9741 * `pub` and `priv` replace deprecated export lists
9742 * The syntax of `match` pattern arms now uses fat arrow (=>)
9743 * `main` no longer accepts an args vector; use `os::args` instead
9746 * Trait implementations are now coherent, ala Haskell typeclasses
9747 * Trait methods may be static
9748 * Argument modes are deprecated
9749 * Borrowed pointers are much more mature and recommended for use
9750 * Strings and vectors in the static region are stored in constant memory
9751 * Typestate was removed
9752 * Resolution rewritten to be more reliable
9753 * Support for 'dual-mode' data structures (freezing and thawing)
9756 * Most binary operators can now be overloaded via the traits in
9758 * `std::net::url` for representing URLs
9759 * Sendable hash maps in `core::send_map`
9760 * `core::task' gained a (currently unsafe) task-local storage API
9763 * An efficient new intertask communication primitive called the pipe,
9764 along with a number of higher-level channel types, in `core::pipes`
9765 * `std::arc`, an atomically reference counted, immutable, shared memory
9767 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9768 * Futures are now based on pipes and sendable
9769 * More robust linked task failure
9770 * Improved task builder API
9773 * Improved error reporting
9774 * Preliminary JIT support
9775 * Preliminary work on precise GC
9776 * Extensive architectural improvements to rustc
9777 * Begun a transition away from buggy C++-based reflection (shape) code to
9778 Rust-based (visitor) code
9779 * All hash functions and tables converted to secure, randomized SipHash
9782 Version 0.3 (2012-07-12)
9783 ========================
9785 * ~1900 changes, numerous bugfixes
9787 * New coding conveniences
9788 * Integer-literal suffix inference
9789 * Per-item control over warnings, errors
9790 * #[cfg(windows)] and #[cfg(unix)] attributes
9791 * Documentation comments
9792 * More compact closure syntax
9793 * 'do' expressions for treating higher-order functions as
9795 * *-patterns (wildcard extended to all constructor fields)
9798 * Name resolution pass and exhaustiveness checker rewritten
9799 * Region pointers and borrow checking supersede alias
9801 * Init-ness checking is now provided by a region-based liveness
9802 pass instead of the typestate pass; same for last-use analysis
9803 * Extensive work on region pointers
9805 * Experimental new language features
9806 * Slices and fixed-size, interior-allocated vectors
9807 * #!-comments for lang versioning, shell execution
9808 * Destructors and iface implementation for classes;
9809 type-parameterized classes and class methods
9810 * 'const' type kind for types that can be used to implement
9811 shared-memory concurrency patterns
9815 * Removal of various obsolete features
9816 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9817 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9819 * Constructs: do-while loops ('do' repurposed), fn binding,
9820 resources (replaced by destructors)
9822 * Compiler reorganization
9823 * Syntax-layer of compiler split into separate crate
9824 * Clang (from LLVM project) integrated into build
9825 * Typechecker split into sub-modules
9828 * New time functions
9829 * Extension methods for many built-in types
9830 * Arc: atomic-refcount read-only / exclusive-use shared cells
9831 * Par: parallel map and search routines
9832 * Extensive work on libuv interface
9833 * Much vector code moved to libraries
9834 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9835 #include, #include_str, #include_bin
9838 * Cargo automatically resolves dependencies
9841 Version 0.2 (2012-03-29)
9842 =========================
9844 * >1500 changes, numerous bugfixes
9846 * New docs and doc tooling
9848 * New port: FreeBSD x86_64
9850 * Compilation model enhancements
9851 * Generics now specialized, multiply instantiated
9852 * Functions now inlined across separate crates
9854 * Scheduling, stack and threading fixes
9855 * Noticeably improved message-passing performance
9856 * Explicit schedulers
9860 * Experimental new language features
9861 * Operator overloading
9865 * Various language extensions
9866 * C-callback function types: 'crust fn ...'
9867 * Infinite-loop construct: 'loop { ... }'
9868 * Shorten 'mutable' to 'mut'
9869 * Required mutable-local qualifier: 'let mut ...'
9870 * Basic glob-exporting: 'export foo::*;'
9871 * Alt now exhaustive, 'alt check' for runtime-checked
9872 * Block-function form of 'for' loop, with 'break' and 'ret'.
9875 * AST quasi-quote syntax extension
9876 * Revived libuv interface
9877 * New modules: core::{future, iter}, std::arena
9878 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9879 * Extensive cleanup, regularization in libstd, libcore
9882 Version 0.1 (2012-01-20)
9883 ===============================
9885 * Most language features work, including:
9886 * Unique pointers, unique closures, move semantics
9887 * Interface-constrained generics
9888 * Static interface dispatch
9890 * Multithread task scheduling
9891 * Typestate predicates
9892 * Failure unwinding, destructors
9893 * Pattern matching and destructuring assignment
9894 * Lightweight block-lambda syntax
9895 * Preliminary macro-by-example
9897 * Compiler works with the following configurations:
9898 * Linux: x86 and x86_64 hosts and targets
9899 * macOS: x86 and x86_64 hosts and targets
9900 * Windows: x86 hosts and targets
9902 * Cross compilation / multi-target configuration supported.
9904 * Preliminary API-documentation and package-management tools included.
9908 * Documentation is incomplete.
9910 * Performance is below intended target.
9912 * Standard library APIs are subject to extensive change, reorganization.
9914 * Language-level versioning is not yet operational - future code will