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]
37 - [Rust now uses `inline-asm` for stack probes when used with LLVM 11.0.1+][77885]
39 \* Refer to Rust's [platform support page][forge-platform-support] for more
40 information on Rust's tiered platform support.
45 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
46 - [`str` now implements `AsMut<str>`.][80279]
47 - [`u64` and `u128` now implement `From<char>`.][79502]
48 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
49 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
50 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
51 - [`io::Empty` now implements `io::Seek`.][78044]
52 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
53 `T: ?Sized` types.][80764]
58 - [`Arc::decrement_strong_count`]
59 - [`Arc::increment_strong_count`]
60 - [`Once::call_once_force`]
61 - [`Peekable::next_if_eq`]
62 - [`Peekable::next_if`]
63 - [`Seek::stream_position`]
65 - [`panic::panic_any`]
67 - [`ptr::addr_of_mut!`]
68 - [`slice::fill_with`]
69 - [`slice::split_inclusive_mut`]
70 - [`slice::split_inclusive`]
71 - [`slice::strip_prefix`]
72 - [`slice::strip_suffix`]
73 - [`str::split_inclusive`]
79 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
80 codegen option.][cargo/9112]
81 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
82 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
83 to avoid unifying features of dependencies where that unification could be unwanted.
84 Such as using the same dependency with a `std` feature in a build scripts and
85 proc-macros, while using the `no-std` feature in the final binary. See the
86 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
91 - [Rustdoc will now include documentation for methods available from `Deref` traits.][80653]
92 - [You can now provide a `--default-theme` flag which sets the default theme to use for
93 documentation.][79642]
95 Various improvements to intra-doc links:
97 - [You can link to non-path primitives such as `slice`.][80181]
98 - [You can link to associated items.][74489]
99 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
103 - [You can now pass `--include-ignored` to tests (e.g. with
104 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
109 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
110 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
112 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
113 for the distributed artifacts.][81521]
114 - `armv5te-unknown-linux-gnueabi`
115 - `sparc64-unknown-linux-gnu`
116 - `thumbv7neon-unknown-linux-gnueabihf`
117 - `armv7-unknown-linux-gnueabi`
118 - `x86_64-unknown-linux-gnux32`
123 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
125 [79135]: https://github.com/rust-lang/rust/pull/79135
126 [74489]: https://github.com/rust-lang/rust/pull/74489
127 [76934]: https://github.com/rust-lang/rust/pull/76934
128 [79570]: https://github.com/rust-lang/rust/pull/79570
129 [80181]: https://github.com/rust-lang/rust/pull/80181
130 [79642]: https://github.com/rust-lang/rust/pull/79642
131 [80945]: https://github.com/rust-lang/rust/pull/80945
132 [80279]: https://github.com/rust-lang/rust/pull/80279
133 [80053]: https://github.com/rust-lang/rust/pull/80053
134 [79502]: https://github.com/rust-lang/rust/pull/79502
135 [75180]: https://github.com/rust-lang/rust/pull/75180
136 [79135]: https://github.com/rust-lang/rust/pull/79135
137 [81521]: https://github.com/rust-lang/rust/pull/81521
138 [80968]: https://github.com/rust-lang/rust/pull/80968
139 [80959]: https://github.com/rust-lang/rust/pull/80959
140 [80718]: https://github.com/rust-lang/rust/pull/80718
141 [80653]: https://github.com/rust-lang/rust/pull/80653
142 [80579]: https://github.com/rust-lang/rust/pull/80579
143 [79998]: https://github.com/rust-lang/rust/pull/79998
144 [78044]: https://github.com/rust-lang/rust/pull/78044
145 [81455]: https://github.com/rust-lang/rust/pull/81455
146 [80764]: https://github.com/rust-lang/rust/pull/80764
147 [80749]: https://github.com/rust-lang/rust/pull/80749
148 [80662]: https://github.com/rust-lang/rust/pull/80662
149 [77885]: https://github.com/rust-lang/rust/pull/77885
150 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
151 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
152 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
153 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
154 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
155 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
156 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
157 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
158 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
159 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
160 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
161 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
162 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
163 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
164 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
165 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
166 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
167 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
168 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
169 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
170 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
172 Version 1.50.0 (2021-02-11)
173 ============================
176 -----------------------
177 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
178 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
179 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
182 -----------------------
183 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
184 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
185 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
186 - [Dropped support for all cloudabi targets.][78439]
188 \* Refer to Rust's [platform support page][forge-platform-support] for more
189 information on Rust's tiered platform support.
192 -----------------------
194 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
195 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
196 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
197 This value cannot be a valid file descriptor, and now means `Option<File>` takes
198 up the same amount of space as `File`.
204 - [`btree_map::Entry::or_insert_with_key`]
207 - [`hash_map::Entry::or_insert_with_key`]
211 - [`UnsafeCell::get_mut`]
213 The following previously stable methods are now `const`.
215 - [`IpAddr::is_ipv4`]
216 - [`IpAddr::is_ipv6`]
217 - [`IpAddr::is_unspecified`]
218 - [`IpAddr::is_loopback`]
219 - [`IpAddr::is_multicast`]
220 - [`Ipv4Addr::octets`]
221 - [`Ipv4Addr::is_loopback`]
222 - [`Ipv4Addr::is_private`]
223 - [`Ipv4Addr::is_link_local`]
224 - [`Ipv4Addr::is_multicast`]
225 - [`Ipv4Addr::is_broadcast`]
226 - [`Ipv4Addr::is_documentation`]
227 - [`Ipv4Addr::to_ipv6_compatible`]
228 - [`Ipv4Addr::to_ipv6_mapped`]
229 - [`Ipv6Addr::segments`]
230 - [`Ipv6Addr::is_unspecified`]
231 - [`Ipv6Addr::is_loopback`]
232 - [`Ipv6Addr::is_multicast`]
233 - [`Ipv6Addr::to_ipv4`]
236 - [`Layout::from_size_align`]
237 - `pow` for all integer types.
238 - `checked_pow` for all integer types.
239 - `saturating_pow` for all integer types.
240 - `wrapping_pow` for all integer types.
241 - `next_power_of_two` for all unsigned integer types.
242 - `checked_next_power_of_two` for all unsigned integer types.
245 -----------------------
247 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
248 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
249 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
250 contents of that directory for changes.][cargo/8973]
251 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
256 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
257 - [Running tests will now print the total time taken to execute.][75752]
262 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
263 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
264 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
265 unhygenic `macro_rules!` macros.][79472]
266 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
267 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
268 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
269 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
270 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
271 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
273 [74989]: https://github.com/rust-lang/rust/pull/74989
274 [79261]: https://github.com/rust-lang/rust/pull/79261
275 [79896]: https://github.com/rust-lang/rust/pull/79896
276 [79484]: https://github.com/rust-lang/rust/pull/79484
277 [79472]: https://github.com/rust-lang/rust/pull/79472
278 [79270]: https://github.com/rust-lang/rust/pull/79270
279 [79003]: https://github.com/rust-lang/rust/pull/79003
280 [78864]: https://github.com/rust-lang/rust/pull/78864
281 [78636]: https://github.com/rust-lang/rust/pull/78636
282 [78439]: https://github.com/rust-lang/rust/pull/78439
283 [78343]: https://github.com/rust-lang/rust/pull/78343
284 [78296]: https://github.com/rust-lang/rust/pull/78296
285 [78068]: https://github.com/rust-lang/rust/pull/78068
286 [75752]: https://github.com/rust-lang/rust/pull/75752
287 [74699]: https://github.com/rust-lang/rust/pull/74699
288 [78142]: https://github.com/rust-lang/rust/pull/78142
289 [77484]: https://github.com/rust-lang/rust/pull/77484
290 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
291 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
292 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
293 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
294 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
295 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
296 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
297 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
298 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
299 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
300 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
301 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
302 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
303 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
304 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
305 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
306 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
307 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
308 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
309 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
310 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
311 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
312 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
313 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
314 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
315 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
316 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
317 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
318 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
319 [`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
320 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
321 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
322 [`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
323 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
326 Version 1.49.0 (2020-12-31)
327 ============================
330 -----------------------
332 - [Unions can now implement `Drop`, and you can now have a field in a union
333 with `ManuallyDrop<T>`.][77547]
334 - [You can now cast uninhabited enums to integers.][76199]
335 - [You can now bind by reference and by move in patterns.][76119] This
336 allows you to selectively borrow individual components of a type. E.g.
344 let person = Person {
345 name: String::from("Alice"),
349 // `name` is moved out of person, but `age` is referenced.
350 let Person { name, ref age } = person;
351 println!("{} {}", name, age);
355 -----------------------
357 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
358 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
359 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
360 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
361 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
362 - [Output from threads spawned in tests is now captured.][78227]
363 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
365 \* Refer to Rust's [platform support page][forge-platform-support] for more
366 information on Rust's tiered platform support.
369 -----------------------
371 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
372 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
377 - [`slice::select_nth_unstable`]
378 - [`slice::select_nth_unstable_by`]
379 - [`slice::select_nth_unstable_by_key`]
381 The following previously stable methods are now `const`.
384 - [`Poll::is_pending`]
387 -----------------------
388 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
389 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
390 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
391 variable will be set if the crate being built is one the user selected to build, either
392 with `-p` or through defaults.
393 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
399 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
400 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
401 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
402 Previously such invalid or unused attributes could be ignored.
403 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
404 read [this post about the changes][rustdoc-ws-post] for more details.
405 - [Trait bounds are no longer inferred for associated types.][79904]
409 These changes provide no direct user facing benefits, but represent significant
410 improvements to the internals and overall performance of rustc and
413 - [rustc's internal crates are now compiled using the `initial-exec` Thread
414 Local Storage model.][78201]
415 - [Calculate visibilities once in resolve.][78077]
416 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
417 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
420 [75991]: https://github.com/rust-lang/rust/pull/75991
421 [78951]: https://github.com/rust-lang/rust/pull/78951
422 [78848]: https://github.com/rust-lang/rust/pull/78848
423 [78746]: https://github.com/rust-lang/rust/pull/78746
424 [78376]: https://github.com/rust-lang/rust/pull/78376
425 [78228]: https://github.com/rust-lang/rust/pull/78228
426 [78227]: https://github.com/rust-lang/rust/pull/78227
427 [78201]: https://github.com/rust-lang/rust/pull/78201
428 [78109]: https://github.com/rust-lang/rust/pull/78109
429 [78077]: https://github.com/rust-lang/rust/pull/78077
430 [77997]: https://github.com/rust-lang/rust/pull/77997
431 [77703]: https://github.com/rust-lang/rust/pull/77703
432 [77547]: https://github.com/rust-lang/rust/pull/77547
433 [77015]: https://github.com/rust-lang/rust/pull/77015
434 [76199]: https://github.com/rust-lang/rust/pull/76199
435 [76119]: https://github.com/rust-lang/rust/pull/76119
436 [75914]: https://github.com/rust-lang/rust/pull/75914
437 [79004]: https://github.com/rust-lang/rust/pull/79004
438 [78676]: https://github.com/rust-lang/rust/pull/78676
439 [79904]: https://github.com/rust-lang/rust/issues/79904
440 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
441 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
442 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
443 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
444 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
445 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
446 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
447 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
448 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
449 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
450 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
452 Version 1.48.0 (2020-11-19)
453 ==========================
458 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
459 is still rejected *semantically*, but can now be parsed by procedural macros.
463 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
464 `rustc` whether to link its own C runtime and libraries or to rely on a external
465 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
466 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
467 Note: If you're using cargo you must explicitly pass the `--target` flag.
468 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
470 \* Refer to Rust's [platform support page][forge-platform-support] for more
471 information on Rust's tiered platform support.
475 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
476 and `&Stderr`.][76275]
477 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
478 - [The `matches!` macro now supports having a trailing comma.][74880]
479 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
480 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
484 - [`slice::as_ptr_range`]
485 - [`slice::as_mut_ptr_range`]
486 - [`VecDeque::make_contiguous`]
487 - [`future::pending`]
490 The following previously stable methods are now `const fn`'s:
492 - [`Option::is_some`]
493 - [`Option::is_none`]
498 - [`Ordering::reverse`]
506 - [You can now link to items in `rustdoc` using the intra-doc link
507 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
508 a link to `std::future`'s documentation. See ["Linking to items by
509 name"][intradoc-links] for more information.
510 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
511 when searching through `rustdoc`'s UI.][75740]
515 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
516 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
517 promoted to `'static` lifetime any more inside `const fn`s.
518 - [Associated type bindings on trait objects are now verified to meet the bounds
519 declared on the trait when checking that they implement the trait.][27675]
520 - [When trait bounds on associated types or opaque types are ambiguous, the
521 compiler no longer makes an arbitrary choice on which bound to use.][54121]
522 - [Fixed recursive nonterminals not being expanded in macros during
523 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
524 correctly handling recursive nonterminal tokens.
525 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
526 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
527 in places where they have no effect.][73461]
528 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
529 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
530 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
531 disallow zero-initialization.][71274]
532 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
533 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
534 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
535 see the [`catch_unwind`] documentation for further information.
541 These changes provide no direct user facing benefits, but represent significant
542 improvements to the internals and overall performance of rustc and
545 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
546 You can continue building with `make` by setting `ninja=false` in
548 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
549 - [Made `ensure_sufficient_stack()` non-generic][76680]
551 [78143]: https://github.com/rust-lang/rust/issues/78143
552 [76680]: https://github.com/rust-lang/rust/pull/76680/
553 [76030]: https://github.com/rust-lang/rust/pull/76030/
554 [70212]: https://github.com/rust-lang/rust/pull/70212/
555 [27675]: https://github.com/rust-lang/rust/issues/27675/
556 [54121]: https://github.com/rust-lang/rust/issues/54121/
557 [71274]: https://github.com/rust-lang/rust/pull/71274/
558 [77386]: https://github.com/rust-lang/rust/pull/77386/
559 [77153]: https://github.com/rust-lang/rust/pull/77153/
560 [77055]: https://github.com/rust-lang/rust/pull/77055/
561 [76275]: https://github.com/rust-lang/rust/pull/76275/
562 [76310]: https://github.com/rust-lang/rust/pull/76310/
563 [76420]: https://github.com/rust-lang/rust/pull/76420/
564 [76158]: https://github.com/rust-lang/rust/pull/76158/
565 [75857]: https://github.com/rust-lang/rust/pull/75857/
566 [75585]: https://github.com/rust-lang/rust/pull/75585/
567 [75740]: https://github.com/rust-lang/rust/pull/75740/
568 [75502]: https://github.com/rust-lang/rust/pull/75502/
569 [74880]: https://github.com/rust-lang/rust/pull/74880/
570 [74922]: https://github.com/rust-lang/rust/pull/74922/
571 [74430]: https://github.com/rust-lang/rust/pull/74430/
572 [74194]: https://github.com/rust-lang/rust/pull/74194/
573 [73461]: https://github.com/rust-lang/rust/pull/73461/
574 [73166]: https://github.com/rust-lang/rust/pull/73166/
575 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
576 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
577 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
578 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
579 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
580 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
581 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
582 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
583 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
584 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
585 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
586 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
587 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
588 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
589 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
592 Version 1.47.0 (2020-10-08)
593 ==========================
597 - [Closures will now warn when not used.][74869]
601 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
602 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
604 - [Upgraded to LLVM 11.][73526]
605 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
606 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
607 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
609 \* Refer to Rust's [platform support page][forge-platform-support] for more
610 information on Rust's tiered platform support.
614 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
615 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
616 those of length less than 33.][74060]
617 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
618 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
619 `PartialEq`, and `PartialOrd`.][73583]
624 - [`Range::is_empty`]
625 - [`RangeInclusive::is_empty`]
626 - [`Result::as_deref`]
627 - [`Result::as_deref_mut`]
629 - [`pointer::offset_from`]
633 The following previously stable APIs have now been made const.
635 - [The `new` method for all `NonZero` integers.][73858]
636 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
637 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
638 methods for all integers.][73858]
639 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
640 signed integers.][73858]
641 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
642 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
643 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
644 `is_ascii_control` methods for `char` and `u8`.][73858]
648 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
649 You can override this by setting the following in your `Cargo.toml`.
651 [profile.release.build-override]
654 - [`cargo-help` will now display man pages for commands rather just the
655 `--help` text.][cargo/8456]
656 - [`cargo-metadata` now emits a `test` field indicating if a target has
657 tests enabled.][cargo/8478]
658 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
659 - [`cargo-publish` will now use an alternative registry by default if it's the
660 only registry specified in `package.publish`.][cargo/8571]
664 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
665 type based search.][75366]
666 - [Added the Ayu theme to rustdoc.][71237]
670 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
671 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
672 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
673 help to preserve more span information.][73084] These changes may cause
674 compiliation errors if your macro was unhygenic or didn't correctly handle
676 - [Moved support for the CloudABI target to tier 3.][75568]
677 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
678 - [Added the `rustc-docs` component.][75560] This allows you to install
679 and read the documentation for the compiler internal APIs. (Currently only
680 available for `x86_64-unknown-linux-gnu`.)
685 - [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.
687 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
688 [75048]: https://github.com/rust-lang/rust/pull/75048/
689 [74163]: https://github.com/rust-lang/rust/pull/74163/
690 [71237]: https://github.com/rust-lang/rust/pull/71237/
691 [74869]: https://github.com/rust-lang/rust/pull/74869/
692 [73858]: https://github.com/rust-lang/rust/pull/73858/
693 [75716]: https://github.com/rust-lang/rust/pull/75716/
694 [75908]: https://github.com/rust-lang/rust/pull/75908/
695 [75516]: https://github.com/rust-lang/rust/pull/75516/
696 [75560]: https://github.com/rust-lang/rust/pull/75560/
697 [75568]: https://github.com/rust-lang/rust/pull/75568/
698 [75366]: https://github.com/rust-lang/rust/pull/75366/
699 [75204]: https://github.com/rust-lang/rust/pull/75204/
700 [74650]: https://github.com/rust-lang/rust/pull/74650/
701 [74419]: https://github.com/rust-lang/rust/pull/74419/
702 [73964]: https://github.com/rust-lang/rust/pull/73964/
703 [74021]: https://github.com/rust-lang/rust/pull/74021/
704 [74060]: https://github.com/rust-lang/rust/pull/74060/
705 [73893]: https://github.com/rust-lang/rust/pull/73893/
706 [73526]: https://github.com/rust-lang/rust/pull/73526/
707 [73583]: https://github.com/rust-lang/rust/pull/73583/
708 [73084]: https://github.com/rust-lang/rust/pull/73084/
709 [73197]: https://github.com/rust-lang/rust/pull/73197/
710 [72488]: https://github.com/rust-lang/rust/pull/72488/
711 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
712 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
713 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
714 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
715 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
716 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
717 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
718 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
719 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
720 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
721 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
722 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
723 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
724 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
725 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
728 Version 1.46.0 (2020-08-27)
729 ==========================
733 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
734 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
735 const functions.][73862]
736 - [The `#[track_caller]` attribute can now be added to functions to use the
737 function's caller's location information for panic messages.][72445]
738 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
739 `x.0.0` over `(x.0).0`.
740 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
741 You currently can't use `mem::transmute` in constant functions.
745 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
746 - [Enabled static "Position Independent Executables" by default
747 for `x86_64-unknown-linux-musl`.][70740]
751 - [`mem::forget` is now a `const fn`.][73887]
752 - [`String` now implements `From<char>`.][73466]
753 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
754 integer types.][73032]
755 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
756 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
757 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
758 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
759 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
760 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
765 - [`vec::Drain::as_slice`]
769 Added a number of new environment variables that are now available when
770 compiling your crate.
772 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
773 the specific binary being compiled and the name of the crate.
774 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
775 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
779 - [The target configuration option `abi_blacklist` has been renamed
780 to `unsupported_abis`.][74150] The old name will still continue to work.
781 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
782 This was previously accepted but will become a hard error in a future release.
783 - [Rustc will fail to compile if you have a struct with
784 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
786 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
787 ensure that spans have the correct information, and may cause breakage if you
788 were relying on receiving spans with dummy information.
789 - [The InnoSetup installer for Windows is no longer available.][72569] This was
790 a legacy installer that was replaced by a MSI installer a few years ago but
791 was still being built.
792 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
793 - [Rustc will no longer accept overlapping trait implementations that only
794 differ in how the lifetime was bound.][72493]
795 - [Rustc now correctly relates the lifetime of an existential associated
796 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
797 you to pass a shorter lifetime than expected.
798 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
799 The library will need to be installed for `rustc` to work, even though we
800 expect it to be already available on most systems.
801 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
803 - [Pretty printing of some tokens in procedural macros changed.][75453] The
804 exact output returned by rustc's pretty printing is an unstable
805 implementation detail: we recommend any macro relying on it to switch to a
806 more robust parsing system.
808 [75453]: https://github.com/rust-lang/rust/issues/75453/
809 [74820]: https://github.com/rust-lang/rust/issues/74820/
810 [74420]: https://github.com/rust-lang/rust/issues/74420/
811 [74109]: https://github.com/rust-lang/rust/pull/74109/
812 [74150]: https://github.com/rust-lang/rust/pull/74150/
813 [73862]: https://github.com/rust-lang/rust/pull/73862/
814 [73887]: https://github.com/rust-lang/rust/pull/73887/
815 [73466]: https://github.com/rust-lang/rust/pull/73466/
816 [73516]: https://github.com/rust-lang/rust/pull/73516/
817 [73293]: https://github.com/rust-lang/rust/pull/73293/
818 [73007]: https://github.com/rust-lang/rust/pull/73007/
819 [73032]: https://github.com/rust-lang/rust/pull/73032/
820 [72920]: https://github.com/rust-lang/rust/pull/72920/
821 [72569]: https://github.com/rust-lang/rust/pull/72569/
822 [72583]: https://github.com/rust-lang/rust/pull/72583/
823 [72584]: https://github.com/rust-lang/rust/pull/72584/
824 [72717]: https://github.com/rust-lang/rust/pull/72717/
825 [72437]: https://github.com/rust-lang/rust/pull/72437/
826 [72445]: https://github.com/rust-lang/rust/pull/72445/
827 [72486]: https://github.com/rust-lang/rust/pull/72486/
828 [72493]: https://github.com/rust-lang/rust/pull/72493/
829 [72331]: https://github.com/rust-lang/rust/pull/72331/
830 [71896]: https://github.com/rust-lang/rust/pull/71896/
831 [71660]: https://github.com/rust-lang/rust/pull/71660/
832 [71322]: https://github.com/rust-lang/rust/pull/71322/
833 [70740]: https://github.com/rust-lang/rust/pull/70740/
834 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
835 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
836 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
837 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
838 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
841 Version 1.45.2 (2020-08-03)
842 ==========================
844 * [Fix bindings in tuple struct patterns][74954]
845 * [Fix track_caller integration with trait objects][74784]
847 [74954]: https://github.com/rust-lang/rust/issues/74954
848 [74784]: https://github.com/rust-lang/rust/issues/74784
851 Version 1.45.1 (2020-07-30)
852 ==========================
854 * [Fix const propagation with references.][73613]
855 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
856 * [Avoid spurious implicit region bound.][74509]
857 * [Install clippy on x.py install][74457]
859 [73613]: https://github.com/rust-lang/rust/pull/73613
860 [73078]: https://github.com/rust-lang/rust/issues/73078
861 [74509]: https://github.com/rust-lang/rust/pull/74509
862 [74457]: https://github.com/rust-lang/rust/pull/74457
865 Version 1.45.0 (2020-07-16)
866 ==========================
870 - [Out of range float to int conversions using `as` has been defined as a saturating
871 conversion.][71269] This was previously undefined behaviour, but you can use the
872 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
873 may be desirable in rare performance sensitive situations.
874 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
876 - [Function like procedural macros can now be used in expression, pattern, and statement
877 positions.][68717] This means you can now use a function-like procedural macro
878 anywhere you can use a declarative (`macro_rules!`) macro.
882 - [You can now override individual target features through the `target-feature`
883 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
884 equivalent to `-C target-feature=+avx2,+fma`.
885 - [Added the `force-unwind-tables` flag.][69984] This option allows
886 rustc to always generate unwind tables regardless of panic strategy.
887 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
888 to include LLVM bitcode into generated `rlib`s (this is on by default).
889 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
890 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
891 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
892 - [Upgraded to LLVM 10.][67759]
894 \* Refer to Rust's [platform support page][forge-platform-support] for more
895 information on Rust's tiered platform support.
900 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
902 - [`proc_macro::TokenStream` now implements `Default`.][72234]
903 - [You can now use `char` with
904 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
905 a range of codepoints.][72413] E.g.
906 you can now write the following;
908 for ch in 'a'..='z' {
912 // Prints "abcdefghijklmnopqrstuvwxyz"
914 - [`OsString` now implements `FromStr`.][71662]
915 - [The `saturating_neg` method has been added to all signed integer primitive
916 types, and the `saturating_abs` method has been added for all integer
917 primitive types.][71886]
918 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
919 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
921 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
922 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
923 integer types.][69813]
924 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
925 integer types.][72324]
926 - [The `fetch_update` method has been added to all atomic integer types.][71843]
931 - [`BTreeMap::remove_entry`]
933 - [`rc::Weak::as_ptr`]
934 - [`rc::Weak::from_raw`]
935 - [`rc::Weak::into_raw`]
936 - [`str::strip_prefix`]
937 - [`str::strip_suffix`]
938 - [`sync::Weak::as_ptr`]
939 - [`sync::Weak::from_raw`]
940 - [`sync::Weak::into_raw`]
941 - [`char::UNICODE_VERSION`]
942 - [`Span::resolved_at`]
943 - [`Span::located_at`]
944 - [`Span::mixed_site`]
945 - [`unix::process::CommandExt::arg0`]
950 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
955 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
956 `~~outdated information~~` becomes "~~outdated information~~".
957 - [Added an emoji to Rustdoc's deprecated API message.][72014]
961 - [Trying to self initialize a static value (that is creating a value using
962 itself) is unsound and now causes a compile error.][71140]
963 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
964 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
965 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
966 previously undocumented and not intended for public use. Rustdoc still provides
967 a non-zero exit code on errors.
968 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
969 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
970 flags while cargo is adding `embed-bitcode` itself. The recommended way to
971 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
972 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
976 - [Make clippy a git subtree instead of a git submodule][70655]
977 - [Unify the undo log of all snapshot types][69464]
979 [71848]: https://github.com/rust-lang/rust/issues/71848/
980 [73420]: https://github.com/rust-lang/rust/issues/73420/
981 [72324]: https://github.com/rust-lang/rust/pull/72324/
982 [71843]: https://github.com/rust-lang/rust/pull/71843/
983 [71886]: https://github.com/rust-lang/rust/pull/71886/
984 [72234]: https://github.com/rust-lang/rust/pull/72234/
985 [72239]: https://github.com/rust-lang/rust/pull/72239/
986 [72397]: https://github.com/rust-lang/rust/pull/72397/
987 [72413]: https://github.com/rust-lang/rust/pull/72413/
988 [72014]: https://github.com/rust-lang/rust/pull/72014/
989 [72062]: https://github.com/rust-lang/rust/pull/72062/
990 [72094]: https://github.com/rust-lang/rust/pull/72094/
991 [72133]: https://github.com/rust-lang/rust/pull/72133/
992 [67759]: https://github.com/rust-lang/rust/pull/67759/
993 [71900]: https://github.com/rust-lang/rust/pull/71900/
994 [71928]: https://github.com/rust-lang/rust/pull/71928/
995 [71662]: https://github.com/rust-lang/rust/pull/71662/
996 [71716]: https://github.com/rust-lang/rust/pull/71716/
997 [71447]: https://github.com/rust-lang/rust/pull/71447/
998 [71269]: https://github.com/rust-lang/rust/pull/71269/
999 [71095]: https://github.com/rust-lang/rust/pull/71095/
1000 [71140]: https://github.com/rust-lang/rust/pull/71140/
1001 [70655]: https://github.com/rust-lang/rust/pull/70655/
1002 [70705]: https://github.com/rust-lang/rust/pull/70705/
1003 [69984]: https://github.com/rust-lang/rust/pull/69984/
1004 [69813]: https://github.com/rust-lang/rust/pull/69813/
1005 [69464]: https://github.com/rust-lang/rust/pull/69464/
1006 [68717]: https://github.com/rust-lang/rust/pull/68717/
1007 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
1008 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
1009 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
1010 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
1011 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
1012 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
1013 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
1014 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
1015 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
1016 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
1017 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
1018 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
1019 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
1020 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
1021 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
1022 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
1023 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
1026 Version 1.44.1 (2020-06-18)
1027 ===========================
1029 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1030 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
1031 * [Fix crashes when finding backtrace on macOS.][71397]
1032 * [Clippy applies lint levels into different files.][clippy/5356]
1034 [71397]: https://github.com/rust-lang/rust/issues/71397
1035 [73078]: https://github.com/rust-lang/rust/issues/73078
1036 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1037 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1040 Version 1.44.0 (2020-06-04)
1041 ==========================
1045 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1046 - [Added the `unused_braces` lint.][70081]
1048 **Syntax-only changes**
1050 - [Expansion-driven outline module parsing][69838]
1055 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1060 These are still rejected semantically, so you will likely receive an error but
1061 these changes can be seen and parsed by macros and conditional compilation.
1065 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1066 Additionally when in incremental mode rustc defaults to 256 codegen units.
1067 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1068 a panic is thrown.][67502]
1069 - [Added tier 3\* support for the `aarch64-unknown-none` and
1070 `aarch64-unknown-none-softfloat` targets.][68334]
1071 - [Added tier 3 support for `arm64-apple-tvos` and
1072 `x86_64-apple-tvos` targets.][68191]
1077 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1078 `vec![]` to be able to be used in `const` contexts.
1079 - [`convert::Infallible` now implements `Hash`.][70281]
1080 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1081 a `&mut OsStr`.][70048]
1082 - [Unicode 13 is now supported.][69929]
1083 - [`String` now implements `From<&mut str>`.][69661]
1084 - [`IoSlice` now implements `Copy`.][69403]
1085 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1086 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1087 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1088 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1089 integer types.][69373]
1093 - [`PathBuf::with_capacity`]
1094 - [`PathBuf::capacity`]
1095 - [`PathBuf::clear`]
1096 - [`PathBuf::reserve`]
1097 - [`PathBuf::reserve_exact`]
1098 - [`PathBuf::shrink_to_fit`]
1099 - [`f32::to_int_unchecked`]
1100 - [`f64::to_int_unchecked`]
1101 - [`Layout::align_to`]
1102 - [`Layout::pad_to_align`]
1104 - [`Layout::extend`]
1108 - [Added the `cargo tree` command which will print a tree graph of
1109 your dependencies.][cargo/8062] E.g.
1111 mdbook v0.3.2 (/Users/src/rust/mdbook)
1113 │ ├── html5ever v0.24.0
1115 │ │ │ └── cfg-if v0.1.9
1117 │ │ └── markup5ever v0.9.0
1118 │ │ ├── log v0.4.8 (*)
1120 │ │ │ └── phf_shared v0.7.24
1121 │ │ │ ├── siphasher v0.2.3
1122 │ │ │ └── unicase v1.4.2
1123 │ │ │ [build-dependencies]
1124 │ │ │ └── version_check v0.1.5
1127 You can also display dependencies on multiple versions of the same crate with
1128 `cargo tree -d` (short for `cargo tree --duplicates`).
1132 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1133 the version in the sidebar.][69494]
1137 - [Rustc now correctly generates static libraries on Windows GNU targets with
1138 the `.a` extension, rather than the previous `.lib`.][70937]
1139 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1140 - [The `file_name` property in JSON output of macro errors now points the actual
1141 source file rather than the previous format of `<NAME macros>`.][70969]
1142 **Note:** this may not point to a file that actually exists on the user's system.
1143 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1144 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1145 not allow zero initialization such as `NonZeroU8`.][66059] This was
1146 previously a warning.
1147 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1148 operator has been defined as a saturating operation.][71269] This was previously
1149 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1150 continue using the current behaviour, which may be desirable in rare performance
1151 sensitive situations.
1155 These changes provide no direct user facing benefits, but represent significant
1156 improvements to the internals and overall performance of rustc and
1159 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1160 - [Replace big JS dict with JSON parsing.][71250]
1162 [69373]: https://github.com/rust-lang/rust/pull/69373/
1163 [66059]: https://github.com/rust-lang/rust/pull/66059/
1164 [68191]: https://github.com/rust-lang/rust/pull/68191/
1165 [68899]: https://github.com/rust-lang/rust/pull/68899/
1166 [71147]: https://github.com/rust-lang/rust/pull/71147/
1167 [71250]: https://github.com/rust-lang/rust/pull/71250/
1168 [70937]: https://github.com/rust-lang/rust/pull/70937/
1169 [70969]: https://github.com/rust-lang/rust/pull/70969/
1170 [70632]: https://github.com/rust-lang/rust/pull/70632/
1171 [70281]: https://github.com/rust-lang/rust/pull/70281/
1172 [70345]: https://github.com/rust-lang/rust/pull/70345/
1173 [70048]: https://github.com/rust-lang/rust/pull/70048/
1174 [70081]: https://github.com/rust-lang/rust/pull/70081/
1175 [70156]: https://github.com/rust-lang/rust/pull/70156/
1176 [71269]: https://github.com/rust-lang/rust/pull/71269/
1177 [69838]: https://github.com/rust-lang/rust/pull/69838/
1178 [69929]: https://github.com/rust-lang/rust/pull/69929/
1179 [69661]: https://github.com/rust-lang/rust/pull/69661/
1180 [69778]: https://github.com/rust-lang/rust/pull/69778/
1181 [69494]: https://github.com/rust-lang/rust/pull/69494/
1182 [69403]: https://github.com/rust-lang/rust/pull/69403/
1183 [69033]: https://github.com/rust-lang/rust/pull/69033/
1184 [68692]: https://github.com/rust-lang/rust/pull/68692/
1185 [68334]: https://github.com/rust-lang/rust/pull/68334/
1186 [67502]: https://github.com/rust-lang/rust/pull/67502/
1187 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1188 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1189 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1190 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1191 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1192 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1193 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1194 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1195 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1196 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1197 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1198 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1199 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1202 Version 1.43.1 (2020-05-07)
1203 ===========================
1205 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1206 * [Fixed the stabilization of AVX-512 features.][71473]
1207 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1209 [71430]: https://github.com/rust-lang/rust/pull/71430
1210 [71473]: https://github.com/rust-lang/rust/issues/71473
1211 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1214 Version 1.43.0 (2020-04-23)
1215 ==========================
1219 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1220 the type inferred correctly.][68129]
1221 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1223 **Syntax only changes**
1224 - [Allow `type Foo: Ord` syntactically.][69361]
1225 - [Fuse associated and extern items up to defaultness.][69194]
1226 - [Syntactically allow `self` in all `fn` contexts.][68764]
1227 - [Merge `fn` syntax + cleanup item parsing.][68728]
1228 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1229 For example, you may now write:
1231 macro_rules! mac_trait {
1241 These are still rejected *semantically*, so you will likely receive an error but
1242 these changes can be seen and parsed by macros and
1243 conditional compilation.
1248 - [You can now pass multiple lint flags to rustc to override the previous
1249 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1250 everything in the `unused` lint group except `unused-variables` which
1251 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1252 everything in the `unused` lint group **including** `unused-variables` since
1253 the allow flag is specified before the deny flag (and therefore overridden).
1254 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1255 if they are available on `windows-gnu`.][67429]
1256 - [rustc now buffers errors/warnings printed in JSON.][69227]
1260 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1261 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1262 respectively.][69538] **Note** These conversions are only available when `N`
1264 - [You can now use associated constants on floats and integers directly, rather
1265 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1266 `f32::NAN` with no imports.
1267 - [`u8::is_ascii` is now `const`.][68984]
1268 - [`String` now implements `AsMut<str>`.][68742]
1269 - [Added the `primitive` module to `std` and `core`.][67637] This module
1270 reexports Rust's primitive types. This is mainly useful in macros
1271 where you want avoid these types being shadowed.
1272 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1273 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1277 - [`Once::is_completed`]
1282 - [`iter::once_with`]
1286 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1287 your environment.][cargo/7823]
1288 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1289 executable path when running integration tests or benchmarks.][cargo/7697]
1290 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1291 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1295 - [Certain checks in the `const_err` lint were deemed unrelated to const
1296 evaluation][69185], and have been moved to the `unconditional_panic` and
1297 `arithmetic_overflow` lints.
1302 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1303 has been a warning since 1.36.0.
1304 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1305 led to some instances being accepted, and now correctly emits a hard error.
1307 [69340]: https://github.com/rust-lang/rust/pull/69340
1311 These changes provide no direct user facing benefits, but represent significant
1312 improvements to the internals and overall performance of `rustc` and
1315 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1316 - [Improved how rustc generates drop code.][67332]
1317 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1318 - [traits: preallocate 2 Vecs of known initial size][69022]
1319 - [Avoid exponential behaviour when relating types][68772]
1320 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1321 - [Improve performance of coherence checks][68966]
1322 - [Deduplicate types in the generator witness][68672]
1323 - [Invert control in struct_lint_level.][68725]
1325 [67332]: https://github.com/rust-lang/rust/pull/67332/
1326 [67429]: https://github.com/rust-lang/rust/pull/67429/
1327 [67637]: https://github.com/rust-lang/rust/pull/67637/
1328 [67642]: https://github.com/rust-lang/rust/pull/67642/
1329 [67878]: https://github.com/rust-lang/rust/pull/67878/
1330 [67885]: https://github.com/rust-lang/rust/pull/67885/
1331 [68129]: https://github.com/rust-lang/rust/pull/68129/
1332 [68672]: https://github.com/rust-lang/rust/pull/68672/
1333 [68725]: https://github.com/rust-lang/rust/pull/68725/
1334 [68728]: https://github.com/rust-lang/rust/pull/68728/
1335 [68738]: https://github.com/rust-lang/rust/pull/68738/
1336 [68742]: https://github.com/rust-lang/rust/pull/68742/
1337 [68764]: https://github.com/rust-lang/rust/pull/68764/
1338 [68772]: https://github.com/rust-lang/rust/pull/68772/
1339 [68943]: https://github.com/rust-lang/rust/pull/68943/
1340 [68952]: https://github.com/rust-lang/rust/pull/68952/
1341 [68966]: https://github.com/rust-lang/rust/pull/68966/
1342 [68984]: https://github.com/rust-lang/rust/pull/68984/
1343 [69022]: https://github.com/rust-lang/rust/pull/69022/
1344 [69185]: https://github.com/rust-lang/rust/pull/69185/
1345 [69194]: https://github.com/rust-lang/rust/pull/69194/
1346 [69201]: https://github.com/rust-lang/rust/pull/69201/
1347 [69227]: https://github.com/rust-lang/rust/pull/69227/
1348 [69548]: https://github.com/rust-lang/rust/pull/69548/
1349 [69256]: https://github.com/rust-lang/rust/pull/69256/
1350 [69361]: https://github.com/rust-lang/rust/pull/69361/
1351 [69366]: https://github.com/rust-lang/rust/pull/69366/
1352 [69538]: https://github.com/rust-lang/rust/pull/69538/
1353 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1354 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1355 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1356 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1357 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1358 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1359 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1360 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1363 Version 1.42.0 (2020-03-12)
1364 ==========================
1368 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1370 fn foo(words: &[&str]) {
1372 ["Hello", "World", "!", ..] => println!("Hello World!"),
1373 ["Foo", "Bar", ..] => println!("Baz"),
1374 rest => println!("{:?}", rest),
1378 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1379 that you can create an enum that has the exact layout and ABI of the type
1381 - [There are some *syntax-only* changes:][67131]
1382 - `default` is syntactically allowed before items in `trait` definitions.
1383 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1384 leave out their bodies in favor of `;`.
1385 - Bounds on associated types in `impl`s are now syntactically allowed
1386 (e.g. `type Foo: Ord;`).
1387 - `...` (the C-variadic type) may occur syntactically directly as the type of
1388 any function parameter.
1390 These are still rejected *semantically*, so you will likely receive an error
1391 but these changes can be seen and parsed by procedural macros and
1392 conditional compilation.
1396 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1397 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1398 - [`Option::{expect,unwrap}` and
1399 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1400 pointing to the location where they were called, rather than
1401 `core`'s internals. ][67887]
1403 \* Refer to Rust's [platform support page][forge-platform-support] for more
1404 information on Rust's tiered platform support.
1408 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1409 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1410 to implement `Sized`.][67935]
1411 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1412 - [`Layout::new` is now `const`.][66254]
1413 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1418 - [`CondVar::wait_while`]
1419 - [`CondVar::wait_timeout_while`]
1421 - [`DebugMap::value`]
1422 - [`ManuallyDrop::take`]
1424 - [`ptr::slice_from_raw_parts_mut`]
1425 - [`ptr::slice_from_raw_parts`]
1429 - [You no longer need to include `extern crate proc_macro;` to be able to
1430 `use proc_macro;` in the `2018` edition.][cargo/7700]
1434 - [`Error::description` has been deprecated, and its use will now produce a
1435 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1437 [68253]: https://github.com/rust-lang/rust/pull/68253/
1438 [68348]: https://github.com/rust-lang/rust/pull/68348/
1439 [67935]: https://github.com/rust-lang/rust/pull/67935/
1440 [68339]: https://github.com/rust-lang/rust/pull/68339/
1441 [68122]: https://github.com/rust-lang/rust/pull/68122/
1442 [67712]: https://github.com/rust-lang/rust/pull/67712/
1443 [67887]: https://github.com/rust-lang/rust/pull/67887/
1444 [67131]: https://github.com/rust-lang/rust/pull/67131/
1445 [67233]: https://github.com/rust-lang/rust/pull/67233/
1446 [66899]: https://github.com/rust-lang/rust/pull/66899/
1447 [66919]: https://github.com/rust-lang/rust/pull/66919/
1448 [66254]: https://github.com/rust-lang/rust/pull/66254/
1449 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1450 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1451 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1452 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1453 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1454 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1455 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1456 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1457 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1460 Version 1.41.1 (2020-02-27)
1461 ===========================
1463 * [Always check types of static items][69145]
1464 * [Always check lifetime bounds of `Copy` impls][69145]
1465 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1467 [69225]: https://github.com/rust-lang/rust/issues/69225
1468 [69145]: https://github.com/rust-lang/rust/pull/69145
1471 Version 1.41.0 (2020-01-30)
1472 ===========================
1477 - [You can now pass type parameters to foreign items when implementing
1478 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1479 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1480 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1481 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1482 - [You can now use any valid identifier in a `format_args` macro.][66847]
1483 Previously identifiers starting with an underscore were not allowed.
1484 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1485 enum variants.][66183] These are still rejected semantically, but
1486 can be seen and parsed by procedural macros and conditional compilation.
1491 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1492 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1493 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1494 - [You can now pass an arguments file passing the `@path` syntax
1495 to rustc.][66172] Note that the format differs somewhat from what is
1496 found in other tooling; please see [the documentation][argfile-docs] for
1498 - [You can now provide `--extern` flag without a path, indicating that it is
1499 available from the search path or specified with an `-L` flag.][64882]
1501 \* Refer to Rust's [platform support page][forge-platform-support] for more
1502 information on Rust's tiered platform support.
1504 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1509 - [The `core::panic` module is now stable.][66771] It was already stable
1511 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1512 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1513 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1518 - [`Result::map_or`]
1519 - [`Result::map_or_else`]
1520 - [`std::rc::Weak::weak_count`]
1521 - [`std::rc::Weak::strong_count`]
1522 - [`std::sync::Weak::weak_count`]
1523 - [`std::sync::Weak::strong_count`]
1528 - [Cargo will now document all the private items for binary crates
1529 by default.][cargo/7593]
1530 - [`cargo-install` will now reinstall the package if it detects that it is out
1531 of date.][cargo/7560]
1532 - [Cargo.lock now uses a more git friendly format that should help to reduce
1533 merge conflicts.][cargo/7579]
1534 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1535 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1536 optimisation level to `2` for debug builds. You can also use
1537 `[profile.<profile>.build-override]` to override build scripts and
1543 - [You can now specify `edition` in documentation code blocks to compile the block
1544 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1545 should be compiled the 2018 edition of Rust.
1546 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1547 current theme with `--check-theme`.][54733]
1548 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1553 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1554 Apple targets.][apple-32bit-drop] This means that the source code is still
1555 available to build, but the targets are no longer being tested and release
1556 binaries for those platforms will no longer be distributed by the Rust project.
1557 Please refer to the linked blog post for more information.
1559 [54733]: https://github.com/rust-lang/rust/pull/54733/
1560 [61351]: https://github.com/rust-lang/rust/pull/61351/
1561 [67255]: https://github.com/rust-lang/rust/pull/67255/
1562 [66661]: https://github.com/rust-lang/rust/pull/66661/
1563 [66771]: https://github.com/rust-lang/rust/pull/66771/
1564 [66847]: https://github.com/rust-lang/rust/pull/66847/
1565 [66238]: https://github.com/rust-lang/rust/pull/66238/
1566 [66277]: https://github.com/rust-lang/rust/pull/66277/
1567 [66325]: https://github.com/rust-lang/rust/pull/66325/
1568 [66172]: https://github.com/rust-lang/rust/pull/66172/
1569 [66183]: https://github.com/rust-lang/rust/pull/66183/
1570 [65879]: https://github.com/rust-lang/rust/pull/65879/
1571 [65013]: https://github.com/rust-lang/rust/pull/65013/
1572 [64882]: https://github.com/rust-lang/rust/pull/64882/
1573 [64325]: https://github.com/rust-lang/rust/pull/64325/
1574 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1575 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1576 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1577 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1578 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1579 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1580 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1581 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1582 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1583 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1584 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1586 Version 1.40.0 (2019-12-19)
1587 ===========================
1591 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1592 `const` contexts.][65188] e.g.
1595 pub struct Point(i32, i32);
1597 const ORIGIN: Point = {
1598 let constructor = Point;
1604 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1605 indicate that there may be variants or fields added in the future.][64639]
1606 For example this requires adding a wild-card branch (`_ => {}`) to any match
1607 statements on a non-exhaustive `enum`. [(RFC 2008)]
1608 - [You can now use function-like procedural macros in `extern` blocks and in
1609 type positions.][63931] e.g. `type Generated = macro!();`
1610 - [Function-like and attribute procedural macros can now emit
1611 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1612 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1613 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1614 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1618 - [Added tier 3 support\* for the
1619 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1620 - [Added tier 3 support for the
1621 `aarch64-unknown-none-softfloat` target.][64589]
1622 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1623 `mips64el-unknown-linux-muslabi64` targets.][65843]
1625 \* Refer to Rust's [platform support page][forge-platform-support] for more
1626 information on Rust's tiered platform support.
1630 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1634 - [`BTreeMap::get_key_value`]
1635 - [`HashMap::get_key_value`]
1636 - [`Option::as_deref_mut`]
1637 - [`Option::as_deref`]
1638 - [`Option::flatten`]
1639 - [`UdpSocket::peer_addr`]
1640 - [`f32::to_be_bytes`]
1641 - [`f32::to_le_bytes`]
1642 - [`f32::to_ne_bytes`]
1643 - [`f64::to_be_bytes`]
1644 - [`f64::to_le_bytes`]
1645 - [`f64::to_ne_bytes`]
1646 - [`f32::from_be_bytes`]
1647 - [`f32::from_le_bytes`]
1648 - [`f32::from_ne_bytes`]
1649 - [`f64::from_be_bytes`]
1650 - [`f64::from_le_bytes`]
1651 - [`f64::from_ne_bytes`]
1658 - [Cargo will now always display warnings, rather than only on
1659 fresh builds.][cargo/7450]
1660 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1661 now produce an error.][cargo/7507] Previously these flags were ignored.
1662 - [You can now publish `dev-dependencies` without including
1663 a `version`.][cargo/7333]
1667 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1668 when running documentation tests with `rustdoc`.][63803]
1672 - [As previously announced, any previous NLL warnings in the 2015 edition are
1673 now hard errors.][64221]
1674 - [The `include!` macro will now warn if it failed to include the
1675 entire file.][64284] The `include!` macro unintentionally only includes the
1676 first _expression_ in a file, and this can be unintuitive. This will become
1677 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1678 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1679 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1680 or `extern` blocks now correctly emits a hard error.
1682 [65294]: https://github.com/rust-lang/rust/pull/65294/
1683 [66103]: https://github.com/rust-lang/rust/pull/66103/
1684 [65843]: https://github.com/rust-lang/rust/pull/65843/
1685 [65188]: https://github.com/rust-lang/rust/pull/65188/
1686 [65092]: https://github.com/rust-lang/rust/pull/65092/
1687 [64589]: https://github.com/rust-lang/rust/pull/64589/
1688 [64639]: https://github.com/rust-lang/rust/pull/64639/
1689 [64221]: https://github.com/rust-lang/rust/pull/64221/
1690 [64284]: https://github.com/rust-lang/rust/pull/64284/
1691 [63931]: https://github.com/rust-lang/rust/pull/63931/
1692 [64035]: https://github.com/rust-lang/rust/pull/64035/
1693 [63674]: https://github.com/rust-lang/rust/pull/63674/
1694 [63803]: https://github.com/rust-lang/rust/pull/63803/
1695 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1696 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1697 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1698 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1699 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1700 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1701 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1702 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1703 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1704 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1705 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1706 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1707 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1708 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1709 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1710 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1711 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1712 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1713 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1714 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1715 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1716 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1717 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1718 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1719 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1720 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1723 Version 1.39.0 (2019-11-07)
1724 ===========================
1728 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1729 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1730 - [You can now use certain attributes on function, closure, and function pointer
1731 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1732 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1733 attributes applied to items. e.g.
1736 #[cfg(windows)] slice: &[u16],
1737 #[cfg(not(windows))] slice: &[u8],
1742 - [You can now take shared references to bind-by-move patterns in the `if` guards
1743 of `match` arms.][63118] e.g.
1746 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1750 // ---- `nums` is bound by move.
1751 if nums.iter().sum::<u8>() == 10
1752 // ^------ `.iter()` implicitly takes a reference to `nums`.
1755 // ----------- Legal as `nums` was bound by move and so we have ownership.
1757 _ => unreachable!(),
1766 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1767 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1768 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1769 **Note** Cargo currently doesn't use this feature. Refer to
1770 [cargo#7315][cargo/7315] to track this feature's progress.
1771 - [You can now pass `--show-output` argument to test binaries to print the
1772 output of successful tests.][62600]
1775 \* Refer to Rust's [platform support page][forge-platform-support] for more
1776 information on Rust's tiered platform support.
1780 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1781 - [`LinkedList::new` is now a `const` function.][63684]
1782 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1783 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1784 now `const`.][63786]
1788 - [`Pin::into_inner`]
1789 - [`Instant::checked_duration_since`]
1790 - [`Instant::saturating_duration_since`]
1794 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1795 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1796 `--all` is now deprecated.
1800 - [You can now pass `-Clinker` to rustdoc to control the linker used
1801 for compiling doctests.][63834]
1805 - [Code that was previously accepted by the old borrow checker, but rejected by
1806 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1807 previously a warning, and will also become a hard error in the Rust 2015
1808 edition in the 1.40.0 release.
1809 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1810 run tests.][63827] This should improve performance when running a large
1812 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1813 recommended to use the `?` operator instead.
1814 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1817 [62600]: https://github.com/rust-lang/rust/pull/62600/
1818 [62672]: https://github.com/rust-lang/rust/pull/62672/
1819 [63118]: https://github.com/rust-lang/rust/pull/63118/
1820 [63209]: https://github.com/rust-lang/rust/pull/63209/
1821 [63402]: https://github.com/rust-lang/rust/pull/63402/
1822 [63565]: https://github.com/rust-lang/rust/pull/63565/
1823 [63595]: https://github.com/rust-lang/rust/pull/63595/
1824 [63684]: https://github.com/rust-lang/rust/pull/63684/
1825 [63698]: https://github.com/rust-lang/rust/pull/63698/
1826 [63770]: https://github.com/rust-lang/rust/pull/63770/
1827 [63786]: https://github.com/rust-lang/rust/pull/63786/
1828 [63827]: https://github.com/rust-lang/rust/pull/63827/
1829 [63834]: https://github.com/rust-lang/rust/pull/63834/
1830 [63927]: https://github.com/rust-lang/rust/pull/63927/
1831 [63933]: https://github.com/rust-lang/rust/pull/63933/
1832 [63934]: https://github.com/rust-lang/rust/pull/63934/
1833 [63938]: https://github.com/rust-lang/rust/pull/63938/
1834 [63940]: https://github.com/rust-lang/rust/pull/63940/
1835 [63941]: https://github.com/rust-lang/rust/pull/63941/
1836 [63945]: https://github.com/rust-lang/rust/pull/63945/
1837 [64010]: https://github.com/rust-lang/rust/pull/64010/
1838 [64028]: https://github.com/rust-lang/rust/pull/64028/
1839 [64334]: https://github.com/rust-lang/rust/pull/64334/
1840 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1841 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1842 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1843 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1844 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1845 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1847 Version 1.38.0 (2019-09-26)
1848 ==========================
1852 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1853 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1857 - [Added pipelined compilation support to `rustc`.][62766] This will
1858 improve compilation times in some cases. For further information please refer
1859 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1860 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1861 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1862 `x86_64-uwp-windows-msvc` targets.][60260]
1863 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1864 `armv7-unknown-linux-musleabi` targets.][63107]
1865 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1866 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1867 - [Upgraded to LLVM 9.][62592]
1869 \* Refer to Rust's [platform support page][forge-platform-support] for more
1870 information on Rust's tiered platform support.
1874 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1875 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1876 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1877 is available at `std::clone::Clone`). This also makes all built-in macros
1878 available in `std`/`core` root. e.g. `std::include_bytes!`.
1879 - [`str::Chars` now implements `Debug`.][63000]
1880 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1881 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1882 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1883 - [Added euclidean remainder and division operations (`div_euclid`,
1884 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1885 `overflowing`, and `wrapping` versions are available for all
1887 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1888 `PartialEq`.][61491]
1889 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1893 - [`<*const T>::cast`]
1894 - [`<*mut T>::cast`]
1895 - [`Duration::as_secs_f32`]
1896 - [`Duration::as_secs_f64`]
1897 - [`Duration::div_f32`]
1898 - [`Duration::div_f64`]
1899 - [`Duration::from_secs_f32`]
1900 - [`Duration::from_secs_f64`]
1901 - [`Duration::mul_f32`]
1902 - [`Duration::mul_f64`]
1903 - [`any::type_name`]
1907 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1908 - [You can now pass the `--features` option multiple times to enable
1909 multiple features.][cargo/7084]
1913 - [`rustc` will now warn about some incorrect uses of
1914 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1918 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1920 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1921 issues][62896] with certain crates such as libc.
1923 [60260]: https://github.com/rust-lang/rust/pull/60260/
1924 [61457]: https://github.com/rust-lang/rust/pull/61457/
1925 [61491]: https://github.com/rust-lang/rust/pull/61491/
1926 [61884]: https://github.com/rust-lang/rust/pull/61884/
1927 [61953]: https://github.com/rust-lang/rust/pull/61953/
1928 [62042]: https://github.com/rust-lang/rust/pull/62042/
1929 [62528]: https://github.com/rust-lang/rust/pull/62528/
1930 [62583]: https://github.com/rust-lang/rust/pull/62583/
1931 [62735]: https://github.com/rust-lang/rust/pull/62735/
1932 [62766]: https://github.com/rust-lang/rust/pull/62766/
1933 [62784]: https://github.com/rust-lang/rust/pull/62784/
1934 [62592]: https://github.com/rust-lang/rust/pull/62592/
1935 [62785]: https://github.com/rust-lang/rust/issues/62785/
1936 [62814]: https://github.com/rust-lang/rust/pull/62814/
1937 [62896]: https://github.com/rust-lang/rust/issues/62896/
1938 [63000]: https://github.com/rust-lang/rust/pull/63000/
1939 [63056]: https://github.com/rust-lang/rust/pull/63056/
1940 [63107]: https://github.com/rust-lang/rust/pull/63107/
1941 [63346]: https://github.com/rust-lang/rust/pull/63346/
1942 [63421]: https://github.com/rust-lang/rust/pull/63421/
1943 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1944 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1945 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1946 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1947 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1948 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1949 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1950 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1951 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1952 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1953 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1954 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1955 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1956 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1957 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1959 Version 1.37.0 (2019-08-15)
1960 ==========================
1964 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1965 [`Box`][62228], or an [array][62235] and unused.
1966 - [You can now use the `cfg` and `cfg_attr` attributes on
1967 generic parameters.][61547]
1968 - [You can now use enum variants through type alias.][61682] e.g. You can
1969 write the following:
1971 type MyOption = Option<u8>;
1973 fn increment_or_zero(x: MyOption) -> u8 {
1975 MyOption::Some(y) => y + 1,
1976 MyOption::None => 0,
1980 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1981 `const _: u32 = 5;`.
1982 - [You can now use `#[repr(align(X)]` on enums.][61229]
1983 - [The `?` Kleene macro operator is now available in the
1984 2015 edition.][60932]
1988 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1989 and `-C profile-use` flags.][61268] For more information on how to use profile
1990 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1991 - [The `rust-lldb` wrapper script should now work again.][61827]
1995 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1999 - [`BufReader::buffer`]
2000 - [`BufWriter::buffer`]
2001 - [`Cell::from_mut`]
2002 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
2003 - [`DoubleEndedIterator::nth_back`]
2005 - [`Wrapping::reverse_bits`]
2006 - [`i128::reverse_bits`]
2007 - [`i16::reverse_bits`]
2008 - [`i32::reverse_bits`]
2009 - [`i64::reverse_bits`]
2010 - [`i8::reverse_bits`]
2011 - [`isize::reverse_bits`]
2012 - [`slice::copy_within`]
2013 - [`u128::reverse_bits`]
2014 - [`u16::reverse_bits`]
2015 - [`u32::reverse_bits`]
2016 - [`u64::reverse_bits`]
2017 - [`u8::reverse_bits`]
2018 - [`usize::reverse_bits`]
2022 - [`Cargo.lock` files are now included by default when publishing executable crates
2023 with executables.][cargo/7026]
2024 - [You can now specify `default-run="foo"` in `[package]` to specify the
2025 default executable to use for `cargo run`.][cargo/7056]
2032 - [Using `...` for inclusive range patterns will now warn by default.][61342]
2033 Please transition your code to using the `..=` syntax for inclusive
2035 - [Using a trait object without the `dyn` will now warn by default.][61203]
2036 Please transition your code to use `dyn Trait` for trait objects instead.
2038 [62228]: https://github.com/rust-lang/rust/pull/62228/
2039 [62235]: https://github.com/rust-lang/rust/pull/62235/
2040 [61802]: https://github.com/rust-lang/rust/pull/61802/
2041 [61827]: https://github.com/rust-lang/rust/pull/61827/
2042 [61547]: https://github.com/rust-lang/rust/pull/61547/
2043 [61682]: https://github.com/rust-lang/rust/pull/61682/
2044 [61268]: https://github.com/rust-lang/rust/pull/61268/
2045 [61342]: https://github.com/rust-lang/rust/pull/61342/
2046 [61347]: https://github.com/rust-lang/rust/pull/61347/
2047 [61100]: https://github.com/rust-lang/rust/pull/61100/
2048 [61203]: https://github.com/rust-lang/rust/pull/61203/
2049 [61229]: https://github.com/rust-lang/rust/pull/61229/
2050 [60932]: https://github.com/rust-lang/rust/pull/60932/
2051 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2052 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2053 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2054 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2055 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2056 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2057 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2058 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2059 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2060 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2061 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2062 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2063 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2064 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2065 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2066 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2067 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2068 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2069 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2070 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2071 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2072 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2073 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2074 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2077 Version 1.36.0 (2019-07-04)
2078 ==========================
2082 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2083 - [The order of traits in trait objects no longer affects the semantics of that
2084 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2085 `dyn fmt::Debug + Send`, where this was previously not the case.
2089 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2090 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2091 - [`mem::needs_drop` is now available as a const fn.][60364]
2092 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2093 - [`String` now implements `BorrowMut<str>`.][60404]
2094 - [`io::Cursor` now implements `Default`.][60234]
2095 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2096 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2097 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2098 environment has access to heap memory allocation.
2099 - [`String` now implements `From<&String>`.][59825]
2100 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2101 return a tuple of each argument when there is multiple arguments.
2102 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2107 - [`VecDeque::rotate_left`]
2108 - [`VecDeque::rotate_right`]
2109 - [`Iterator::copied`]
2111 - [`io::IoSliceMut`]
2112 - [`Read::read_vectored`]
2113 - [`Write::write_vectored`]
2114 - [`str::as_mut_ptr`]
2115 - [`mem::MaybeUninit`]
2116 - [`pointer::align_offset`]
2117 - [`future::Future`]
2119 - [`task::RawWaker`]
2120 - [`task::RawWakerVTable`]
2126 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2127 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2129 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2133 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2140 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2141 longer recommended, and will be deprecated in 1.39.0.
2143 [60318]: https://github.com/rust-lang/rust/pull/60318/
2144 [60364]: https://github.com/rust-lang/rust/pull/60364/
2145 [60370]: https://github.com/rust-lang/rust/pull/60370/
2146 [60404]: https://github.com/rust-lang/rust/pull/60404/
2147 [60234]: https://github.com/rust-lang/rust/pull/60234/
2148 [60244]: https://github.com/rust-lang/rust/pull/60244/
2149 [58623]: https://github.com/rust-lang/rust/pull/58623/
2150 [59648]: https://github.com/rust-lang/rust/pull/59648/
2151 [59675]: https://github.com/rust-lang/rust/pull/59675/
2152 [59825]: https://github.com/rust-lang/rust/pull/59825/
2153 [59826]: https://github.com/rust-lang/rust/pull/59826/
2154 [59445]: https://github.com/rust-lang/rust/pull/59445/
2155 [59114]: https://github.com/rust-lang/rust/pull/59114/
2156 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2157 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2158 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2159 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2160 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2161 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2162 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2163 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2164 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2165 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2166 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2167 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2168 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2169 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2170 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2171 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2172 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2173 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2174 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2175 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2178 Version 1.35.0 (2019-05-23)
2179 ==========================
2183 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2184 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2185 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2187 unsafe fn call_unsafe(func: unsafe fn()) {
2192 unsafe { call_unsafe(|| {}); }
2199 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2200 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2201 - [Added the `wasm32-unknown-wasi` target.][59464]
2206 - [`Thread` will now show its ID in `Debug` output.][59460]
2207 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2208 - [`alloc::System` now implements `Default`.][59451]
2209 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2211 - [`char::{ToLowercase, ToUppercase}` now
2212 implement `ExactSizeIterator`.][58778]
2213 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2214 - [Removed the `Read` trait bounds
2215 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2216 - [You can now call the `dbg!` macro without any parameters to print the file
2217 and line where it is called.][57847]
2218 - [In place ASCII case conversions are now up to 4× faster.][59283]
2219 e.g. `str::make_ascii_lowercase`
2220 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2227 - [`RefCell::replace_with`]
2228 - [`RefCell::map_split`]
2230 - [`Range::contains`]
2231 - [`RangeFrom::contains`]
2232 - [`RangeTo::contains`]
2233 - [`RangeInclusive::contains`]
2234 - [`RangeToInclusive::contains`]
2235 - [`Option::copied`]
2239 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2240 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2245 - [The Rust toolchain is now available natively for musl based distros.][58575]
2247 [59460]: https://github.com/rust-lang/rust/pull/59460/
2248 [59464]: https://github.com/rust-lang/rust/pull/59464/
2249 [59500]: https://github.com/rust-lang/rust/pull/59500/
2250 [59512]: https://github.com/rust-lang/rust/pull/59512/
2251 [59580]: https://github.com/rust-lang/rust/pull/59580/
2252 [59283]: https://github.com/rust-lang/rust/pull/59283/
2253 [59451]: https://github.com/rust-lang/rust/pull/59451/
2254 [59076]: https://github.com/rust-lang/rust/pull/59076/
2255 [58778]: https://github.com/rust-lang/rust/pull/58778/
2256 [58717]: https://github.com/rust-lang/rust/pull/58717/
2257 [58369]: https://github.com/rust-lang/rust/pull/58369/
2258 [58423]: https://github.com/rust-lang/rust/pull/58423/
2259 [58080]: https://github.com/rust-lang/rust/pull/58080/
2260 [57847]: https://github.com/rust-lang/rust/pull/57847/
2261 [58575]: https://github.com/rust-lang/rust/pull/58575
2262 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2263 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2264 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2265 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2266 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2267 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2268 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2269 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2270 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2271 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2272 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2273 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2275 Version 1.34.2 (2019-05-14)
2276 ===========================
2278 * [Destabilize the `Error::type_id` function due to a security
2279 vulnerability][60785] ([CVE-2019-12083])
2281 [60785]: https://github.com/rust-lang/rust/pull/60785
2282 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2284 Version 1.34.1 (2019-04-25)
2285 ===========================
2287 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2288 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2289 * [Fix Clippy panic when checking some macros][clippy/3805]
2291 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2292 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2293 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2295 Version 1.34.0 (2019-04-11)
2296 ==========================
2300 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2301 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2303 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2304 `#[attr{}]` procedural macros.][57367]
2305 - [You can now write `extern crate self as foo;`][57407] to import your
2306 crate's root into the extern prelude.
2311 - [You can now target `riscv64imac-unknown-none-elf` and
2312 `riscv64gc-unknown-none-elf`.][58406]
2313 - [You can now enable linker plugin LTO optimisations with
2314 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2315 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2317 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2322 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2323 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2324 the `Hash` trait to create an iterator.
2325 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2326 methods.][58421] Most notably you no longer require the `Ord` trait to create
2328 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2329 for all numeric types.][58044]
2330 - [Indexing a `str` is now generic over all types that
2331 implement `SliceIndex<str>`.][57604]
2332 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2333 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2334 produce a warning if their returning type is unused.
2335 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2336 `overflowing_pow` are now available for all numeric types.][57873] These are
2337 equivalent to methods such as `wrapping_add` for the `pow` operation.
2345 * [`Error::type_id`]
2346 * [`atomic::AtomicI16`]
2347 * [`atomic::AtomicI32`]
2348 * [`atomic::AtomicI64`]
2349 * [`atomic::AtomicI8`]
2350 * [`atomic::AtomicU16`]
2351 * [`atomic::AtomicU32`]
2352 * [`atomic::AtomicU64`]
2353 * [`atomic::AtomicU8`]
2354 * [`convert::Infallible`]
2355 * [`convert::TryFrom`]
2356 * [`convert::TryInto`]
2358 * [`iter::successors`]
2359 * [`num::NonZeroI128`]
2360 * [`num::NonZeroI16`]
2361 * [`num::NonZeroI32`]
2362 * [`num::NonZeroI64`]
2363 * [`num::NonZeroI8`]
2364 * [`num::NonZeroIsize`]
2365 * [`slice::sort_by_cached_key`]
2366 * [`str::escape_debug`]
2367 * [`str::escape_default`]
2368 * [`str::escape_unicode`]
2369 * [`str::split_ascii_whitespace`]
2372 * [`Instant::checked_add`]
2373 * [`Instant::checked_sub`]
2374 * [`SystemTime::checked_add`]
2375 * [`SystemTime::checked_sub`]
2379 - [You can now use alternative registries to crates.io.][cargo/6654]
2383 - [You can now use the `?` operator in your documentation tests without manually
2384 adding `fn main() -> Result<(), _> {}`.][56470]
2388 - [`Command::before_exec` is being replaced by the unsafe method
2389 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2390 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2391 can now use `const` functions in `static` variables.
2393 [58370]: https://github.com/rust-lang/rust/pull/58370/
2394 [58406]: https://github.com/rust-lang/rust/pull/58406/
2395 [58421]: https://github.com/rust-lang/rust/pull/58421/
2396 [58166]: https://github.com/rust-lang/rust/pull/58166/
2397 [58044]: https://github.com/rust-lang/rust/pull/58044/
2398 [58057]: https://github.com/rust-lang/rust/pull/58057/
2399 [58059]: https://github.com/rust-lang/rust/pull/58059/
2400 [57809]: https://github.com/rust-lang/rust/pull/57809/
2401 [57873]: https://github.com/rust-lang/rust/pull/57873/
2402 [57604]: https://github.com/rust-lang/rust/pull/57604/
2403 [57367]: https://github.com/rust-lang/rust/pull/57367/
2404 [57407]: https://github.com/rust-lang/rust/pull/57407/
2405 [57425]: https://github.com/rust-lang/rust/pull/57425/
2406 [57106]: https://github.com/rust-lang/rust/pull/57106/
2407 [56470]: https://github.com/rust-lang/rust/pull/56470/
2408 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2409 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2410 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2411 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2412 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2413 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2414 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2415 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2416 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2417 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2418 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2419 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2420 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2421 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2422 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2423 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2424 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2425 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2426 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2427 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2428 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2429 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2430 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2431 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2432 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2433 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2434 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2435 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2436 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2437 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2438 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2441 Version 1.33.0 (2019-02-28)
2442 ==========================
2446 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2447 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2448 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2449 E.g. You can have match statement on a `u8` that covers `0..=255` and
2450 you would no longer be required to have a `_ => unreachable!()` case.
2451 - [You can now have multiple patterns in `if let` and `while let`
2452 expressions.][57532] You can do this with the same syntax as a `match`
2462 let state = Creature::Crab("Ferris");
2464 if let Creature::Crab(name) | Creature::Person(name) = state {
2465 println!("This creature's name is: {}", name);
2469 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2470 this feature will by default produce a warning as this behaviour can be
2471 unintuitive. E.g. `if let _ = 5 {}`
2472 - [You can now use `let` bindings, assignments, expression statements,
2473 and irrefutable pattern destructuring in const functions.][57175]
2474 - [You can now call unsafe const functions.][57067] E.g.
2476 const unsafe fn foo() -> i32 { 5 }
2477 const fn bar() -> i32 {
2481 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2482 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2483 - [You can now specify a specific alignment with the `#[repr(packed)]`
2484 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2485 with an alignment of 2 bytes and a size of 6 bytes.
2486 - [You can now import an item from a module as an `_`.][56303] This allows you to
2487 import a trait's impls, and not have the name in the namespace. E.g.
2489 use std::io::Read as _;
2491 // Allowed as there is only one `Read` in the module.
2494 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2498 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2499 command line argument.][56351]
2500 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2501 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2502 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2503 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2504 information on Rust's platform support.
2505 - [Added support for the `thumbv7neon-linux-androideabi` and
2506 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2507 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2511 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2512 functions for all numeric types.][57566]
2513 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2514 are now `const` functions for all numeric types.][57105]
2515 - [The methods `is_positive` and `is_negative` are now `const` functions for
2516 all signed numeric types.][57105]
2517 - [The `get` method for all `NonZero` types is now `const`.][57167]
2518 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2519 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2520 numeric types.][57234]
2521 - [`Ipv4Addr::new` is now a `const` function][57234]
2525 - [`unix::FileExt::read_exact_at`]
2526 - [`unix::FileExt::write_all_at`]
2527 - [`Option::transpose`]
2528 - [`Result::transpose`]
2529 - [`convert::identity`]
2532 - [`marker::PhantomPinned`]
2533 - [`Vec::resize_with`]
2534 - [`VecDeque::resize_with`]
2535 - [`Duration::as_millis`]
2536 - [`Duration::as_micros`]
2537 - [`Duration::as_nanos`]
2542 - [You can now publish crates that require a feature flag to compile with
2543 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2544 - [Cargo should now rebuild a crate if a file was modified during the initial
2549 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2550 are now deprecated in the standard library, and their usage will now produce a warning.
2551 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2553 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2555 - [Libtest no longer creates a new thread for each test when
2556 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2558 [55982]: https://github.com/rust-lang/rust/pull/55982/
2559 [56243]: https://github.com/rust-lang/rust/pull/56243
2560 [56303]: https://github.com/rust-lang/rust/pull/56303/
2561 [56351]: https://github.com/rust-lang/rust/pull/56351/
2562 [56362]: https://github.com/rust-lang/rust/pull/56362
2563 [56642]: https://github.com/rust-lang/rust/pull/56642/
2564 [56769]: https://github.com/rust-lang/rust/pull/56769/
2565 [56805]: https://github.com/rust-lang/rust/pull/56805
2566 [56947]: https://github.com/rust-lang/rust/pull/56947/
2567 [57049]: https://github.com/rust-lang/rust/pull/57049/
2568 [57067]: https://github.com/rust-lang/rust/pull/57067/
2569 [57105]: https://github.com/rust-lang/rust/pull/57105
2570 [57130]: https://github.com/rust-lang/rust/pull/57130/
2571 [57167]: https://github.com/rust-lang/rust/pull/57167/
2572 [57175]: https://github.com/rust-lang/rust/pull/57175/
2573 [57234]: https://github.com/rust-lang/rust/pull/57234/
2574 [57332]: https://github.com/rust-lang/rust/pull/57332/
2575 [57465]: https://github.com/rust-lang/rust/pull/57465/
2576 [57532]: https://github.com/rust-lang/rust/pull/57532/
2577 [57535]: https://github.com/rust-lang/rust/pull/57535/
2578 [57566]: https://github.com/rust-lang/rust/pull/57566/
2579 [57615]: https://github.com/rust-lang/rust/pull/57615/
2580 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2581 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2582 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2583 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2584 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2585 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2586 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2587 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2588 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2589 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2590 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2591 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2592 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2593 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2594 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2595 [platform-support]: https://forge.rust-lang.org/platform-support.html
2597 Version 1.32.0 (2019-01-17)
2598 ==========================
2603 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2604 operator allows you to specify zero or one repetitions similar to the `*` and
2606 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2607 now always resolve to the item (`enum`, `struct`, etc.) available in the
2608 module if present, before resolving to a external crate or an item the prelude.][56759]
2611 enum Color { Red, Green, Blue }
2617 - [You can now match against `PhantomData<T>` types.][55837]
2618 - [You can now match against literals in macros with the `literal`
2619 specifier.][56072] This will match against a literal of any type.
2620 E.g. `1`, `'A'`, `"Hello World"`
2621 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2623 struct Point(i32, i32);
2626 pub fn new(x: i32, y: i32) -> Self {
2630 pub fn is_origin(&self) -> bool {
2638 - [Self can also now be used in type definitions.][56366] E.g.
2642 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2645 Cons(T, Box<Self>) // likewise here
2648 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2649 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2653 - [The default allocator has changed from jemalloc to the default allocator on
2654 your system.][55238] The compiler itself on Linux & macOS will still use
2655 jemalloc, but programs compiled with it will use the system allocator.
2656 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2660 - [`PathBuf` now implements `FromStr`.][55148]
2661 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2662 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2663 easily debug expressions in your rust program. E.g.
2666 let b = dbg!(a * 2) + 1;
2667 // ^-- prints: [src/main.rs:4] a * 2 = 4
2671 The following APIs are now `const` functions and can be used in a
2675 - [`UnsafeCell::get`]
2676 - [`char::is_ascii`]
2678 - [`ManuallyDrop::new`]
2679 - [`ManuallyDrop::into_inner`]
2680 - [`RangeInclusive::start`]
2681 - [`RangeInclusive::end`]
2682 - [`NonNull::as_ptr`]
2685 - [`Duration::as_secs`]
2686 - [`Duration::subsec_millis`]
2687 - [`Duration::subsec_micros`]
2688 - [`Duration::subsec_nanos`]
2690 - [`Ipv4Addr::is_unspecified`]
2692 - [`Ipv6Addr::octets`]
2696 - [`i8::to_be_bytes`]
2697 - [`i8::to_le_bytes`]
2698 - [`i8::to_ne_bytes`]
2699 - [`i8::from_be_bytes`]
2700 - [`i8::from_le_bytes`]
2701 - [`i8::from_ne_bytes`]
2702 - [`i16::to_be_bytes`]
2703 - [`i16::to_le_bytes`]
2704 - [`i16::to_ne_bytes`]
2705 - [`i16::from_be_bytes`]
2706 - [`i16::from_le_bytes`]
2707 - [`i16::from_ne_bytes`]
2708 - [`i32::to_be_bytes`]
2709 - [`i32::to_le_bytes`]
2710 - [`i32::to_ne_bytes`]
2711 - [`i32::from_be_bytes`]
2712 - [`i32::from_le_bytes`]
2713 - [`i32::from_ne_bytes`]
2714 - [`i64::to_be_bytes`]
2715 - [`i64::to_le_bytes`]
2716 - [`i64::to_ne_bytes`]
2717 - [`i64::from_be_bytes`]
2718 - [`i64::from_le_bytes`]
2719 - [`i64::from_ne_bytes`]
2720 - [`i128::to_be_bytes`]
2721 - [`i128::to_le_bytes`]
2722 - [`i128::to_ne_bytes`]
2723 - [`i128::from_be_bytes`]
2724 - [`i128::from_le_bytes`]
2725 - [`i128::from_ne_bytes`]
2726 - [`isize::to_be_bytes`]
2727 - [`isize::to_le_bytes`]
2728 - [`isize::to_ne_bytes`]
2729 - [`isize::from_be_bytes`]
2730 - [`isize::from_le_bytes`]
2731 - [`isize::from_ne_bytes`]
2732 - [`u8::to_be_bytes`]
2733 - [`u8::to_le_bytes`]
2734 - [`u8::to_ne_bytes`]
2735 - [`u8::from_be_bytes`]
2736 - [`u8::from_le_bytes`]
2737 - [`u8::from_ne_bytes`]
2738 - [`u16::to_be_bytes`]
2739 - [`u16::to_le_bytes`]
2740 - [`u16::to_ne_bytes`]
2741 - [`u16::from_be_bytes`]
2742 - [`u16::from_le_bytes`]
2743 - [`u16::from_ne_bytes`]
2744 - [`u32::to_be_bytes`]
2745 - [`u32::to_le_bytes`]
2746 - [`u32::to_ne_bytes`]
2747 - [`u32::from_be_bytes`]
2748 - [`u32::from_le_bytes`]
2749 - [`u32::from_ne_bytes`]
2750 - [`u64::to_be_bytes`]
2751 - [`u64::to_le_bytes`]
2752 - [`u64::to_ne_bytes`]
2753 - [`u64::from_be_bytes`]
2754 - [`u64::from_le_bytes`]
2755 - [`u64::from_ne_bytes`]
2756 - [`u128::to_be_bytes`]
2757 - [`u128::to_le_bytes`]
2758 - [`u128::to_ne_bytes`]
2759 - [`u128::from_be_bytes`]
2760 - [`u128::from_le_bytes`]
2761 - [`u128::from_ne_bytes`]
2762 - [`usize::to_be_bytes`]
2763 - [`usize::to_le_bytes`]
2764 - [`usize::to_ne_bytes`]
2765 - [`usize::from_be_bytes`]
2766 - [`usize::from_le_bytes`]
2767 - [`usize::from_ne_bytes`]
2771 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2772 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2776 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2780 - [The argument types for AVX's
2781 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2782 been changed from `*const` to `*mut` as the previous implementation
2786 [55148]: https://github.com/rust-lang/rust/pull/55148/
2787 [55238]: https://github.com/rust-lang/rust/pull/55238/
2788 [55280]: https://github.com/rust-lang/rust/pull/55280/
2789 [55610]: https://github.com/rust-lang/rust/pull/55610/
2790 [55663]: https://github.com/rust-lang/rust/pull/55663/
2791 [55702]: https://github.com/rust-lang/rust/pull/55702/
2792 [55837]: https://github.com/rust-lang/rust/pull/55837/
2793 [55843]: https://github.com/rust-lang/rust/pull/55843/
2794 [56072]: https://github.com/rust-lang/rust/pull/56072/
2795 [56245]: https://github.com/rust-lang/rust/pull/56245/
2796 [56365]: https://github.com/rust-lang/rust/pull/56365/
2797 [56366]: https://github.com/rust-lang/rust/pull/56366/
2798 [56395]: https://github.com/rust-lang/rust/pull/56395/
2799 [56759]: https://github.com/rust-lang/rust/pull/56759/
2800 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2801 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2802 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2803 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2804 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2805 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2806 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2807 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2808 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2809 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2810 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2811 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2812 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2813 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2814 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2815 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2816 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2817 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2818 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2819 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2820 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2821 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2822 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2823 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2824 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2825 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2826 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2827 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2828 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2829 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2830 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2831 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2832 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2833 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2834 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2835 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2836 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2837 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2838 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2839 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2840 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2841 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2842 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2843 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2844 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2845 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2846 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2847 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2848 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2849 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2850 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2851 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2852 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2853 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2854 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2855 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2856 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2857 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2858 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2859 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2860 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2861 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2862 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2863 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2864 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2865 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2866 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2867 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2868 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2869 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2870 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2871 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2872 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2873 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2874 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2875 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2876 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2877 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2878 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2879 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2880 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2881 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2882 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2883 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2884 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2885 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2886 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2887 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2888 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2889 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2890 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2891 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2892 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2895 Version 1.31.1 (2018-12-20)
2896 ===========================
2898 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2899 - [Fix broken go-to-definition in RLS][rls/1171]
2900 - [Fix infinite loop on hover in RLS][rls/1170]
2902 [56562]: https://github.com/rust-lang/rust/pull/56562
2903 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2904 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2906 Version 1.31.0 (2018-12-06)
2907 ==========================
2911 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2912 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2913 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2914 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2916 - [You can now define and use `const` functions.][54835] These are currently
2917 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2918 [language reference][const-reference] for what exactly is available.
2919 - [You can now use tool lints, which allow you to scope lints from external
2920 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2921 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2922 a crate, not just in exported functions.][54451]
2923 - [You can now use parentheses in pattern matches.][54497]
2927 - [Updated musl to 1.1.20][54430]
2931 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2932 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2933 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2934 into `Option<&mut T>` using the `From` trait.][53218]
2935 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2940 - [`slice::align_to`]
2941 - [`slice::align_to_mut`]
2942 - [`slice::chunks_exact`]
2943 - [`slice::chunks_exact_mut`]
2944 - [`slice::rchunks`]
2945 - [`slice::rchunks_mut`]
2946 - [`slice::rchunks_exact`]
2947 - [`slice::rchunks_exact_mut`]
2948 - [`Option::replace`]
2952 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2953 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2954 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2956 [52813]: https://github.com/rust-lang/rust/pull/52813/
2957 [53218]: https://github.com/rust-lang/rust/pull/53218/
2958 [53555]: https://github.com/rust-lang/rust/issues/53555/
2959 [54057]: https://github.com/rust-lang/rust/pull/54057/
2960 [54240]: https://github.com/rust-lang/rust/pull/54240/
2961 [54430]: https://github.com/rust-lang/rust/pull/54430/
2962 [54451]: https://github.com/rust-lang/rust/pull/54451/
2963 [54497]: https://github.com/rust-lang/rust/pull/54497/
2964 [54778]: https://github.com/rust-lang/rust/pull/54778/
2965 [54835]: https://github.com/rust-lang/rust/pull/54835/
2966 [54870]: https://github.com/rust-lang/rust/pull/54870/
2967 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2968 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2969 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2970 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2971 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2972 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2973 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2974 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2975 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2976 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2977 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2978 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2979 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2980 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2982 Version 1.30.1 (2018-11-08)
2983 ===========================
2985 - [Fixed overflow ICE in rustdoc][54199]
2986 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2988 [54199]: https://github.com/rust-lang/rust/pull/54199
2989 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2991 Version 1.30.0 (2018-10-25)
2992 ==========================
2996 - [Procedural macros are now available.][52081] These kinds of macros allow for
2997 more powerful code generation. There is a [new chapter available][proc-macros]
2998 in the Rust Programming Language book that goes further in depth.
2999 - [You can now use keywords as identifiers using the raw identifiers
3000 syntax (`r#`),][53236] e.g. `let r#for = true;`
3001 - [Using anonymous parameters in traits is now deprecated with a warning and
3002 will be a hard error in the 2018 edition.][53272]
3003 - [You can now use `crate` in paths.][54404] This allows you to refer to the
3004 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
3005 - [Using a external crate no longer requires being prefixed with `::`.][54404]
3006 Previously, using a external crate in a module without a use statement
3007 required `let json = ::serde_json::from_str(foo);` but can now be written
3008 as `let json = serde_json::from_str(foo);`.
3009 - [You can now apply the `#[used]` attribute to static items to prevent the
3010 compiler from optimising them away, even if they appear to be unused,][51363]
3011 e.g. `#[used] static FOO: u32 = 1;`
3012 - [You can now import and reexport macros from other crates with the `use`
3013 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
3014 the root module of the crate. If your macro relies on calling other local
3015 macros, it is recommended to export with the
3016 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
3018 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
3019 using the `vis` specifier.][53370]
3020 - [Non-macro attributes now allow all forms of literals, not just
3021 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
3022 write `#[attr(true)]`.
3023 - [You can now specify a function to handle a panic in the Rust runtime with the
3024 `#[panic_handler]` attribute.][51366]
3028 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
3029 - [Added the `aarch64-unknown-netbsd` target][53165]
3030 - [Upgraded to LLVM 8.][53611]
3034 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3038 - [`Ipv4Addr::BROADCAST`]
3039 - [`Ipv4Addr::LOCALHOST`]
3040 - [`Ipv4Addr::UNSPECIFIED`]
3041 - [`Ipv6Addr::LOCALHOST`]
3042 - [`Ipv6Addr::UNSPECIFIED`]
3043 - [`Iterator::find_map`]
3045 The following methods are replacement methods for `trim_left`, `trim_right`,
3046 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3048 - [`str::trim_end_matches`]
3050 - [`str::trim_start_matches`]
3051 - [`str::trim_start`]
3055 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3056 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3057 equivalent to calling `rustdoc --error-format=json`.
3058 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3062 - [`rustdoc` allows you to specify what edition to treat your code as with the
3063 `--edition` option.][54057]
3064 - [`rustdoc` now has the `--color` (specify whether to output color) and
3065 `--error-format` (specify error format, e.g. `json`) options.][53003]
3066 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3067 debug symbols.][53774]
3068 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3069 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3071 [50911]: https://github.com/rust-lang/rust/pull/50911/
3072 [51363]: https://github.com/rust-lang/rust/pull/51363/
3073 [51366]: https://github.com/rust-lang/rust/pull/51366/
3074 [52081]: https://github.com/rust-lang/rust/pull/52081/
3075 [53003]: https://github.com/rust-lang/rust/pull/53003/
3076 [53033]: https://github.com/rust-lang/rust/pull/53033/
3077 [53044]: https://github.com/rust-lang/rust/pull/53044/
3078 [53165]: https://github.com/rust-lang/rust/pull/53165/
3079 [53611]: https://github.com/rust-lang/rust/pull/53611/
3080 [53213]: https://github.com/rust-lang/rust/pull/53213/
3081 [53236]: https://github.com/rust-lang/rust/pull/53236/
3082 [53272]: https://github.com/rust-lang/rust/pull/53272/
3083 [53370]: https://github.com/rust-lang/rust/pull/53370/
3084 [53459]: https://github.com/rust-lang/rust/pull/53459/
3085 [53774]: https://github.com/rust-lang/rust/pull/53774/
3086 [53822]: https://github.com/rust-lang/rust/pull/53822/
3087 [54057]: https://github.com/rust-lang/rust/pull/54057/
3088 [54146]: https://github.com/rust-lang/rust/pull/54146/
3089 [54404]: https://github.com/rust-lang/rust/pull/54404/
3090 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3091 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3092 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3093 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3095 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3096 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3097 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3098 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3099 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3100 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3101 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3102 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3103 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3104 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3107 Version 1.29.2 (2018-10-11)
3108 ===========================
3110 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3111 - The `rls-preview` component on the windows-gnu targets has been restored.
3113 [54639]: https://github.com/rust-lang/rust/pull/54639
3116 Version 1.29.1 (2018-09-25)
3117 ===========================
3122 - The standard library's `str::repeat` function contained an out of bounds write
3123 caused by an integer overflow. This has been fixed by deterministically
3124 panicking when an overflow happens.
3126 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3130 Version 1.29.0 (2018-09-13)
3131 ==========================
3135 - [Bumped minimum LLVM version to 5.0.][51899]
3136 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3137 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3138 - [Upgraded to LLVM 7.][51966]
3142 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3143 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3144 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3145 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3147 - [`Cell<T>` now allows `T` to be unsized.][50494]
3148 - [`SocketAddr` is now stable on Redox.][52656]
3153 - [`Iterator::flatten`]
3158 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3159 `--locked` to disable this behavior.
3160 - [`cargo-install` will now allow you to cross compile an install
3161 using `--target`.][cargo/5614]
3162 - [Added the `cargo-fix` subcommand to automatically move project code from
3163 2015 edition to 2018.][cargo/5723]
3164 - [`cargo doc` can now optionally document private types using the
3165 `--document-private-items` flag.][cargo/5543]
3169 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3170 the specified level to that level.][52354] For example `--cap-lints warn`
3171 will demote `deny` and `forbid` lints to `warn`.
3172 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3173 fails and `101` if there is a panic.][52197]
3174 - [A preview of clippy has been made available through rustup.][51122]
3175 You can install the preview with `rustup component add clippy-preview`.
3179 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3180 Use `str::get_unchecked(begin..end)` instead.
3181 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3182 Consider using the `home_dir` function from
3183 https://crates.io/crates/dirs instead.
3184 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3185 - [`cfg` attributes and `--cfg` command line flags are now more
3186 strictly validated.][53893]
3188 [53893]: https://github.com/rust-lang/rust/pull/53893/
3189 [52861]: https://github.com/rust-lang/rust/pull/52861/
3190 [51966]: https://github.com/rust-lang/rust/pull/51966/
3191 [52656]: https://github.com/rust-lang/rust/pull/52656/
3192 [52239]: https://github.com/rust-lang/rust/pull/52239/
3193 [52330]: https://github.com/rust-lang/rust/pull/52330/
3194 [52354]: https://github.com/rust-lang/rust/pull/52354/
3195 [52402]: https://github.com/rust-lang/rust/pull/52402/
3196 [52103]: https://github.com/rust-lang/rust/pull/52103/
3197 [52197]: https://github.com/rust-lang/rust/pull/52197/
3198 [51807]: https://github.com/rust-lang/rust/pull/51807/
3199 [51899]: https://github.com/rust-lang/rust/pull/51899/
3200 [51912]: https://github.com/rust-lang/rust/pull/51912/
3201 [51511]: https://github.com/rust-lang/rust/pull/51511/
3202 [51619]: https://github.com/rust-lang/rust/pull/51619/
3203 [51656]: https://github.com/rust-lang/rust/pull/51656/
3204 [51178]: https://github.com/rust-lang/rust/pull/51178/
3205 [51122]: https://github.com/rust-lang/rust/pull/51122
3206 [50494]: https://github.com/rust-lang/rust/pull/50494/
3207 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3208 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3209 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3210 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3211 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3212 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3213 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3216 Version 1.28.0 (2018-08-02)
3217 ===========================
3221 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3222 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3223 the inner type across Foreign Function Interface (FFI) boundaries.
3224 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3225 and can now be used as identifiers.][51196]
3226 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3227 stable.][51241] This will allow users to specify a global allocator for
3229 - [Unit test functions marked with the `#[test]` attribute can now return
3230 `Result<(), E: Debug>` in addition to `()`.][51298]
3231 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3232 allows macros to easily target lifetimes.
3236 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3237 prioritise making smaller binary sizes. `z` is the same as `s` with the
3238 exception that it does not vectorise loops, which typically results in an even
3240 - [The short error format is now stable.][49546] Specified with
3241 `--error-format=short` this option will provide a more compressed output of
3242 rust error messages.
3243 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3244 - [Reduced the number of allocations in the macro parser.][50855] This can
3245 improve compile times of macro heavy crates on average by 5%.
3249 - [Implemented `Default` for `&mut str`.][51306]
3250 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3251 - [Implemented `Extend` for `()`.][50234]
3252 - [The `Debug` implementation of `time::Duration` should now be more easily
3253 human readable.][50364] Previously a `Duration` of one second would printed as
3254 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3255 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3256 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3257 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3258 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3259 for `PathBuf`.][50170]
3260 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3261 and `Wrapping<i128>`.][50465]
3262 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3263 possible.][51050] This can provide up to a 40% speed increase.
3264 - [Improved error messages when using `format!`.][50610]
3268 - [`Iterator::step_by`]
3269 - [`Path::ancestors`]
3270 - [`SystemTime::UNIX_EPOCH`]
3271 - [`alloc::GlobalAlloc`]
3273 - [`alloc::LayoutErr`]
3276 - [`alloc::alloc_zeroed`]
3277 - [`alloc::dealloc`]
3278 - [`alloc::realloc`]
3279 - [`alloc::handle_alloc_error`]
3280 - [`btree_map::Entry::or_default`]
3281 - [`fmt::Alignment`]
3282 - [`hash_map::Entry::or_default`]
3283 - [`iter::repeat_with`]
3284 - [`num::NonZeroUsize`]
3285 - [`num::NonZeroU128`]
3286 - [`num::NonZeroU16`]
3287 - [`num::NonZeroU32`]
3288 - [`num::NonZeroU64`]
3289 - [`num::NonZeroU8`]
3290 - [`ops::RangeBounds`]
3291 - [`slice::SliceIndex`]
3292 - [`slice::from_mut`]
3293 - [`slice::from_ref`]
3294 - [`{Any + Send + Sync}::downcast_mut`]
3295 - [`{Any + Send + Sync}::downcast_ref`]
3296 - [`{Any + Send + Sync}::is`]
3300 - [Cargo will now no longer allow you to publish crates with build scripts that
3301 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3302 considered to be immutable.
3306 - [The `suggestion_applicability` field in `rustc`'s json output is now
3307 stable.][50486] This will allow dev tools to check whether a code suggestion
3308 would apply to them.
3312 - [Rust will consider trait objects with duplicated constraints to be the same
3313 type as without the duplicated constraint.][51276] For example the below code will
3314 now fail to compile.
3319 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3322 impl Trait + Send + Send {
3323 fn test(&self) { println!("two"); }
3327 [49546]: https://github.com/rust-lang/rust/pull/49546/
3328 [50143]: https://github.com/rust-lang/rust/pull/50143/
3329 [50170]: https://github.com/rust-lang/rust/pull/50170/
3330 [50234]: https://github.com/rust-lang/rust/pull/50234/
3331 [50265]: https://github.com/rust-lang/rust/pull/50265/
3332 [50364]: https://github.com/rust-lang/rust/pull/50364/
3333 [50385]: https://github.com/rust-lang/rust/pull/50385/
3334 [50465]: https://github.com/rust-lang/rust/pull/50465/
3335 [50486]: https://github.com/rust-lang/rust/pull/50486/
3336 [50554]: https://github.com/rust-lang/rust/pull/50554/
3337 [50610]: https://github.com/rust-lang/rust/pull/50610/
3338 [50855]: https://github.com/rust-lang/rust/pull/50855/
3339 [51050]: https://github.com/rust-lang/rust/pull/51050/
3340 [51196]: https://github.com/rust-lang/rust/pull/51196/
3341 [51200]: https://github.com/rust-lang/rust/pull/51200/
3342 [51241]: https://github.com/rust-lang/rust/pull/51241/
3343 [51276]: https://github.com/rust-lang/rust/pull/51276/
3344 [51298]: https://github.com/rust-lang/rust/pull/51298/
3345 [51306]: https://github.com/rust-lang/rust/pull/51306/
3346 [51562]: https://github.com/rust-lang/rust/pull/51562/
3347 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3348 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3349 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3350 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3351 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3352 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3353 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3354 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3355 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3356 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3357 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3358 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3359 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3360 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3361 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3362 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3363 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3364 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3365 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3366 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3367 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3368 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3369 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3370 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3371 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3372 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3373 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3374 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3375 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3376 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3378 Version 1.27.2 (2018-07-20)
3379 ===========================
3384 - The borrow checker was fixed to avoid potential unsoundness when using
3385 match ergonomics: [#52213][52213].
3387 [52213]: https://github.com/rust-lang/rust/issues/52213
3389 Version 1.27.1 (2018-07-10)
3390 ===========================
3395 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3396 when running, which enabled executing code as some other user on a
3397 given machine. This release fixes that vulnerability; you can read
3398 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3400 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3405 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3406 match ergonomics: [#51415][51415], [#49534][49534].
3408 [51415]: https://github.com/rust-lang/rust/issues/51415
3409 [49534]: https://github.com/rust-lang/rust/issues/49534
3410 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3411 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3413 Version 1.27.0 (2018-06-21)
3414 ==========================
3418 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3419 be used as an identifier.
3420 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3421 bare `Trait` syntax, and should make it clearer when being used in tandem with
3422 `impl Trait` because it is equivalent to the following syntax:
3423 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3424 `Box<Trait> == Box<dyn Trait>`.
3425 - [Attributes on generic parameters such as types and lifetimes are
3426 now stable.][48851] e.g.
3427 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3428 - [The `#[must_use]` attribute can now also be used on functions as well as
3429 types.][48925] It provides a lint that by default warns users when the
3430 value returned by a function has not been used.
3434 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3438 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3439 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3440 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3441 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3442 the `cfg` attribute.
3443 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3444 std are now available in core.][49896]
3445 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3447 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3448 that the operation isn't done in place.
3449 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3450 the `#[must_use]` attribute][49533] to warn about unused potentially
3451 expensive allocations.
3455 - [`DoubleEndedIterator::rfind`]
3456 - [`DoubleEndedIterator::rfold`]
3457 - [`DoubleEndedIterator::try_rfold`]
3458 - [`Duration::from_micros`]
3459 - [`Duration::from_nanos`]
3460 - [`Duration::subsec_micros`]
3461 - [`Duration::subsec_millis`]
3462 - [`HashMap::remove_entry`]
3463 - [`Iterator::try_fold`]
3464 - [`Iterator::try_for_each`]
3466 - [`Option::filter`]
3467 - [`String::replace_range`]
3468 - [`Take::set_limit`]
3469 - [`hint::unreachable_unchecked`]
3470 - [`os::unix::process::parent_id`]
3471 - [`ptr::swap_nonoverlapping`]
3472 - [`slice::rsplit_mut`]
3474 - [`slice::swap_with_slice`]
3478 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3479 `readme`, and `repository` fields.][cargo/5386]
3480 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3481 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3482 a different directory than `target` for placing compilation artifacts.
3483 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3484 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3485 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3486 where cargo would infer a binary, Cargo will produce a warning. You can
3487 disable this feature ahead of time by setting any of the following to false:
3488 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3489 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3490 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3494 - [Added “The Rustc book” into the official documentation.][49707]
3495 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3496 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3500 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3501 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3502 compile, `"".is_empty()` will still compile.
3503 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3504 will only print the inner type.][48553] E.g.
3505 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3506 not `AtomicBool(true)`.
3507 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3508 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3509 alignment should cover all use cases.
3510 - The `.description()` method on the `std::error::Error` trait
3511 [has been soft-deprecated][50163]. It is no longer required to implement it.
3513 [48553]: https://github.com/rust-lang/rust/pull/48553/
3514 [48851]: https://github.com/rust-lang/rust/pull/48851/
3515 [48925]: https://github.com/rust-lang/rust/pull/48925/
3516 [49533]: https://github.com/rust-lang/rust/pull/49533/
3517 [49623]: https://github.com/rust-lang/rust/pull/49623/
3518 [49630]: https://github.com/rust-lang/rust/pull/49630/
3519 [49664]: https://github.com/rust-lang/rust/pull/49664/
3520 [49699]: https://github.com/rust-lang/rust/pull/49699/
3521 [49707]: https://github.com/rust-lang/rust/pull/49707/
3522 [49719]: https://github.com/rust-lang/rust/pull/49719/
3523 [49896]: https://github.com/rust-lang/rust/pull/49896/
3524 [49968]: https://github.com/rust-lang/rust/pull/49968/
3525 [50163]: https://github.com/rust-lang/rust/pull/50163
3526 [50177]: https://github.com/rust-lang/rust/pull/50177/
3527 [50378]: https://github.com/rust-lang/rust/pull/50378/
3528 [50398]: https://github.com/rust-lang/rust/pull/50398/
3529 [50423]: https://github.com/rust-lang/rust/pull/50423/
3530 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3531 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3532 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3533 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3534 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3535 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3536 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3537 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3538 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3539 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3540 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3541 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3542 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3543 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3544 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3545 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3546 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3547 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3548 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3549 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3550 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3551 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3552 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3553 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3554 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3555 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3556 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3557 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3558 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3559 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3562 Version 1.26.2 (2018-06-05)
3563 ==========================
3568 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3570 [51117]: https://github.com/rust-lang/rust/issues/51117
3573 Version 1.26.1 (2018-05-29)
3574 ==========================
3579 - [RLS now works on Windows.][50646]
3580 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3586 - [`fn main() -> impl Trait` no longer works for non-Termination
3588 This reverts an accidental stabilization.
3589 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3590 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3592 [50646]: https://github.com/rust-lang/rust/issues/50646
3593 [50656]: https://github.com/rust-lang/rust/pull/50656
3594 [50812]: https://github.com/rust-lang/rust/pull/50812
3595 [50950]: https://github.com/rust-lang/rust/issues/50950
3596 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3598 Version 1.26.0 (2018-05-10)
3599 ==========================
3603 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3604 implement either or both traits.][49299]
3605 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3606 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3607 lifetime can be elided.][49458]
3608 - [`impl Trait` is now stable allowing you to have abstract types in returns
3609 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3610 `fn open(path: impl AsRef<Path>)`.
3611 - [Pattern matching will now automatically apply dereferences.][49394]
3612 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3613 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3614 - [A lot of operations are now available in a const context.][46882] E.g. You
3615 can now index into constant arrays, reference and dereference into constants,
3616 and use tuple struct constructors.
3617 - [Fixed entry slice patterns are now stable.][48516] E.g.
3619 let points = [1, 2, 3, 4];
3621 [1, 2, 3, 4] => println!("All points were sequential."),
3622 _ => println!("Not all points were sequential."),
3629 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3630 - [Fixed exponential projection complexity on nested types.][48296]
3631 This can provide up to a ~12% reduction in compile times for certain crates.
3632 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3633 to remap path prefixes outputted by the compiler.
3634 - [Added `powerpc-unknown-netbsd` target.][48281]
3638 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3639 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3640 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3641 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3642 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3643 - [`ascii::escape_default` is now available in libcore.][48735]
3644 - [Trailing commas are now supported in std and core macros.][48056]
3645 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3646 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3651 - [`*const T::copy_to_nonoverlapping`]
3652 - [`*const T::copy_to`]
3653 - [`*const T::read_unaligned`]
3654 - [`*const T::read_volatile`]
3655 - [`*const T::read`]
3657 - [`*const T::wrapping_add`]
3658 - [`*const T::wrapping_sub`]
3660 - [`*mut T::copy_to_nonoverlapping`]
3661 - [`*mut T::copy_to`]
3662 - [`*mut T::read_unaligned`]
3663 - [`*mut T::read_volatile`]
3665 - [`*mut T::replace`]
3668 - [`*mut T::wrapping_add`]
3669 - [`*mut T::wrapping_sub`]
3670 - [`*mut T::write_bytes`]
3671 - [`*mut T::write_unaligned`]
3672 - [`*mut T::write_volatile`]
3675 - [`FromUtf8Error::as_bytes`]
3676 - [`LocalKey::try_with`]
3677 - [`Option::cloned`]
3678 - [`btree_map::Entry::and_modify`]
3679 - [`fs::read_to_string`]
3682 - [`hash_map::Entry::and_modify`]
3683 - [`iter::FusedIterator`]
3684 - [`ops::RangeInclusive`]
3685 - [`ops::RangeToInclusive`]
3687 - [`slice::rotate_left`]
3688 - [`slice::rotate_right`]
3689 - [`String::retain`]
3694 - [Cargo will now output path to custom commands when `-v` is
3695 passed with `--list`][cargo/5041]
3696 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3700 - [The second edition of "The Rust Programming Language" book is now recommended
3701 over the first.][48404]
3706 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3707 syntax is now invalid.
3709 use std::ops::Fn as dyn;
3710 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3712 - [The result of dereferences are no longer promoted to `'static`.][47408]
3716 const PAIR: &(i32, i32) = &(0, 1);
3717 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3720 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3721 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3723 - [Removed hoedown from rustdoc.][48274]
3724 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3726 [46882]: https://github.com/rust-lang/rust/pull/46882
3727 [47379]: https://github.com/rust-lang/rust/pull/47379
3728 [47408]: https://github.com/rust-lang/rust/pull/47408
3729 [47813]: https://github.com/rust-lang/rust/pull/47813
3730 [48056]: https://github.com/rust-lang/rust/pull/48056
3731 [48125]: https://github.com/rust-lang/rust/pull/48125
3732 [48166]: https://github.com/rust-lang/rust/pull/48166
3733 [48235]: https://github.com/rust-lang/rust/pull/48235
3734 [48274]: https://github.com/rust-lang/rust/pull/48274
3735 [48281]: https://github.com/rust-lang/rust/pull/48281
3736 [48296]: https://github.com/rust-lang/rust/pull/48296
3737 [48326]: https://github.com/rust-lang/rust/pull/48326
3738 [48359]: https://github.com/rust-lang/rust/pull/48359
3739 [48404]: https://github.com/rust-lang/rust/pull/48404
3740 [48481]: https://github.com/rust-lang/rust/pull/48481
3741 [48516]: https://github.com/rust-lang/rust/pull/48516
3742 [48628]: https://github.com/rust-lang/rust/pull/48628
3743 [48629]: https://github.com/rust-lang/rust/pull/48629
3744 [48657]: https://github.com/rust-lang/rust/pull/48657
3745 [48735]: https://github.com/rust-lang/rust/pull/48735
3746 [48978]: https://github.com/rust-lang/rust/pull/48978
3747 [49101]: https://github.com/rust-lang/rust/pull/49101
3748 [49109]: https://github.com/rust-lang/rust/pull/49109
3749 [49121]: https://github.com/rust-lang/rust/pull/49121
3750 [49162]: https://github.com/rust-lang/rust/pull/49162
3751 [49184]: https://github.com/rust-lang/rust/pull/49184
3752 [49234]: https://github.com/rust-lang/rust/pull/49234
3753 [49255]: https://github.com/rust-lang/rust/pull/49255
3754 [49299]: https://github.com/rust-lang/rust/pull/49299
3755 [49305]: https://github.com/rust-lang/rust/pull/49305
3756 [49394]: https://github.com/rust-lang/rust/pull/49394
3757 [49458]: https://github.com/rust-lang/rust/pull/49458
3758 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3759 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3760 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3761 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3762 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3763 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3764 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3765 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3766 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3767 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3768 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3769 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3770 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3771 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3772 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3773 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3774 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3775 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3776 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3777 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3778 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3779 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3780 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3781 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3782 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3783 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3784 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3785 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3786 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3787 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3788 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3789 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3790 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3791 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3792 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3793 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3794 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3795 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3796 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3797 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3798 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3799 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3802 Version 1.25.0 (2018-03-29)
3803 ==========================
3807 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3808 - [You can now use nested groups of imports.][47948]
3809 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3810 - [You can now have `|` at the start of a match arm.][47947] e.g.
3812 enum Foo { A, B, C }
3818 | Foo::B => println!("AB"),
3819 | Foo::C => println!("C"),
3826 - [Upgraded to LLVM 6.][47828]
3827 - [Added `-C lto=val` option.][47521]
3828 - [Added `i586-unknown-linux-musl` target][47282]
3832 - [Impl Send for `process::Command` on Unix.][47760]
3833 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3834 - [`UnsafeCell::into_inner` is now safe.][47204]
3835 - [Implement libstd for CloudABI.][47268]
3836 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3837 - [Implement `AsRef<Path>` for Component][46985]
3838 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3839 - [Moved `Duration` to libcore.][46666]
3843 - [`Location::column`]
3846 The following functions can now be used in a constant expression.
3847 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3848 - [`Duration::new`][47300]
3849 - [`Duration::from_secs`][47300]
3850 - [`Duration::from_millis`][47300]
3854 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3855 - [`cargo new` now defaults to creating a binary crate, instead of a
3856 library crate.][cargo/5029]
3860 - [Rust by example is now shipped with new releases][46196]
3864 - [Deprecated `net::lookup_host`.][47510]
3865 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3866 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3867 around indexing operations (see [#47349][47349]). This has been fixed (which also
3868 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3869 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3871 [33903]: https://github.com/rust-lang/rust/pull/33903
3872 [47947]: https://github.com/rust-lang/rust/pull/47947
3873 [47948]: https://github.com/rust-lang/rust/pull/47948
3874 [47760]: https://github.com/rust-lang/rust/pull/47760
3875 [47790]: https://github.com/rust-lang/rust/pull/47790
3876 [47828]: https://github.com/rust-lang/rust/pull/47828
3877 [47398]: https://github.com/rust-lang/rust/pull/47398
3878 [47510]: https://github.com/rust-lang/rust/pull/47510
3879 [47521]: https://github.com/rust-lang/rust/pull/47521
3880 [47204]: https://github.com/rust-lang/rust/pull/47204
3881 [47251]: https://github.com/rust-lang/rust/pull/47251
3882 [47268]: https://github.com/rust-lang/rust/pull/47268
3883 [47282]: https://github.com/rust-lang/rust/pull/47282
3884 [47300]: https://github.com/rust-lang/rust/pull/47300
3885 [47349]: https://github.com/rust-lang/rust/pull/47349
3886 [46931]: https://github.com/rust-lang/rust/pull/46931
3887 [46985]: https://github.com/rust-lang/rust/pull/46985
3888 [47006]: https://github.com/rust-lang/rust/pull/47006
3889 [46830]: https://github.com/rust-lang/rust/pull/46830
3890 [46095]: https://github.com/rust-lang/rust/pull/46095
3891 [46666]: https://github.com/rust-lang/rust/pull/46666
3892 [46196]: https://github.com/rust-lang/rust/pull/46196
3893 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3894 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3895 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3896 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3897 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3900 Version 1.24.1 (2018-03-01)
3901 ==========================
3903 - [Do not abort when unwinding through FFI][48251]
3904 - [Emit UTF-16 files for linker arguments on Windows][48318]
3905 - [Make the error index generator work again][48308]
3906 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3908 [48251]: https://github.com/rust-lang/rust/issues/48251
3909 [48308]: https://github.com/rust-lang/rust/issues/48308
3910 [48318]: https://github.com/rust-lang/rust/issues/48318
3911 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3914 Version 1.24.0 (2018-02-15)
3915 ==========================
3919 - [External `sysv64` ffi is now available.][46528]
3920 eg. `extern "sysv64" fn foo () {}`
3924 - [rustc now uses 16 codegen units by default for release builds.][46910]
3925 For the fastest builds, utilize `codegen-units=1`.
3926 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3927 - [Add `aarch64-unknown-openbsd` support][46760]
3931 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3932 improvement in performance in the majority of cases.
3933 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3934 with Windows.][46798]
3935 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3936 - [impl `From<bool>` for `AtomicBool`][46293]
3937 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3938 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3939 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3940 - [float::from_bits now just uses transmute.][46012] This provides
3941 some optimisations from LLVM.
3942 - [Copied `AsciiExt` methods onto `char`][46077]
3943 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3944 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3945 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3946 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3950 - [`RefCell::replace`]
3952 - [`atomic::spin_loop_hint`]
3954 The following functions can now be used in a constant expression.
3955 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3957 - [`AtomicBool::new`][46287]
3958 - [`AtomicUsize::new`][46287]
3959 - [`AtomicIsize::new`][46287]
3960 - [`AtomicPtr::new`][46287]
3961 - [`Cell::new`][46287]
3962 - [`{integer}::min_value`][46287]
3963 - [`{integer}::max_value`][46287]
3964 - [`mem::size_of`][46287]
3965 - [`mem::align_of`][46287]
3966 - [`ptr::null`][46287]
3967 - [`ptr::null_mut`][46287]
3968 - [`RefCell::new`][46287]
3969 - [`UnsafeCell::new`][46287]
3973 - [Added a `workspace.default-members` config that
3974 overrides implied `--all` in virtual workspaces.][cargo/4743]
3975 - [Enable incremental by default on development builds.][cargo/4817] Also added
3976 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3977 per-project or global basis respectively.
3984 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3985 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3986 in accordance with IETF RFC 4291 §2.2.
3987 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3988 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3989 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3990 - [Leading zeros in tuple struct members is now an error][47084]
3991 - [`column!()` macro is one-based instead of zero-based][46977]
3992 - [`fmt::Arguments` can no longer be shared across threads][45198]
3993 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3994 - [Cargo sets a different working directory for the compiler][cargo/4788]
3996 [44884]: https://github.com/rust-lang/rust/pull/44884
3997 [45198]: https://github.com/rust-lang/rust/pull/45198
3998 [45506]: https://github.com/rust-lang/rust/pull/45506
3999 [45904]: https://github.com/rust-lang/rust/pull/45904
4000 [45990]: https://github.com/rust-lang/rust/pull/45990
4001 [46012]: https://github.com/rust-lang/rust/pull/46012
4002 [46077]: https://github.com/rust-lang/rust/pull/46077
4003 [46094]: https://github.com/rust-lang/rust/pull/46094
4004 [46284]: https://github.com/rust-lang/rust/pull/46284
4005 [46287]: https://github.com/rust-lang/rust/pull/46287
4006 [46293]: https://github.com/rust-lang/rust/pull/46293
4007 [46528]: https://github.com/rust-lang/rust/pull/46528
4008 [46671]: https://github.com/rust-lang/rust/pull/46671
4009 [46713]: https://github.com/rust-lang/rust/pull/46713
4010 [46735]: https://github.com/rust-lang/rust/pull/46735
4011 [46749]: https://github.com/rust-lang/rust/pull/46749
4012 [46760]: https://github.com/rust-lang/rust/pull/46760
4013 [46798]: https://github.com/rust-lang/rust/pull/46798
4014 [46828]: https://github.com/rust-lang/rust/pull/46828
4015 [46831]: https://github.com/rust-lang/rust/pull/46831
4016 [46833]: https://github.com/rust-lang/rust/pull/46833
4017 [46910]: https://github.com/rust-lang/rust/pull/46910
4018 [46977]: https://github.com/rust-lang/rust/pull/46977
4019 [47018]: https://github.com/rust-lang/rust/pull/47018
4020 [47080]: https://github.com/rust-lang/rust/pull/47080
4021 [47084]: https://github.com/rust-lang/rust/pull/47084
4022 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
4023 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
4024 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
4025 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
4026 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
4027 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
4030 Version 1.23.0 (2018-01-04)
4031 ==========================
4035 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4036 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4037 Which should fix some confusing errors in some operations.
4041 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4042 undefined behavior.][45920]
4043 - [rustc now suggests renaming import if names clash.][45660]
4044 - [Display errors/warnings correctly when there are zero-width or
4045 wide characters.][45711]
4046 - [rustc now avoids unnecessary copies of arguments that are
4047 simple bindings][45380] This should improve memory usage on average by 5-10%.
4048 - [Updated musl used to build musl rustc to 1.1.17][45393]
4052 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4053 - [Implement Hash for raw pointers to unsized types][45483]
4054 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4055 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4056 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4057 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4058 and `<*mut T>::as_mut`][44932]
4059 - [Optimized `Thread::{park, unpark}` implementation][45524]
4060 - [Improved `SliceExt::binary_search` performance.][45333]
4061 - [impl `FromIterator<()>` for `()`][45379]
4062 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4070 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4071 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4072 - [Added unit test checking to `cargo check`][cargo/4592]
4073 - [Cargo now lets you install a specific version
4074 using `cargo install --version`][cargo/4637]
4078 - [Releases now ship with the Cargo book documentation.][45692]
4079 - [rustdoc now prints rendering warnings on every run.][45324]
4083 - [Changes have been made to type equality to make it more correct,
4084 in rare cases this could break some code.][45853] [Tracking issue for
4085 further information][45852]
4086 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4087 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4088 Android 9, the minimum supported version is Android 14.
4089 - [Bumped the minimum LLVM to 3.9][45326]
4091 [44042]: https://github.com/rust-lang/rust/pull/44042
4092 [44932]: https://github.com/rust-lang/rust/pull/44932
4093 [45267]: https://github.com/rust-lang/rust/pull/45267
4094 [45324]: https://github.com/rust-lang/rust/pull/45324
4095 [45326]: https://github.com/rust-lang/rust/pull/45326
4096 [45333]: https://github.com/rust-lang/rust/pull/45333
4097 [45379]: https://github.com/rust-lang/rust/pull/45379
4098 [45380]: https://github.com/rust-lang/rust/pull/45380
4099 [45393]: https://github.com/rust-lang/rust/pull/45393
4100 [45435]: https://github.com/rust-lang/rust/pull/45435
4101 [45483]: https://github.com/rust-lang/rust/pull/45483
4102 [45524]: https://github.com/rust-lang/rust/pull/45524
4103 [45571]: https://github.com/rust-lang/rust/pull/45571
4104 [45580]: https://github.com/rust-lang/rust/pull/45580
4105 [45610]: https://github.com/rust-lang/rust/pull/45610
4106 [45660]: https://github.com/rust-lang/rust/pull/45660
4107 [45692]: https://github.com/rust-lang/rust/pull/45692
4108 [45711]: https://github.com/rust-lang/rust/pull/45711
4109 [45772]: https://github.com/rust-lang/rust/pull/45772
4110 [45852]: https://github.com/rust-lang/rust/issues/45852
4111 [45853]: https://github.com/rust-lang/rust/pull/45853
4112 [45887]: https://github.com/rust-lang/rust/pull/45887
4113 [45920]: https://github.com/rust-lang/rust/pull/45920
4114 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4115 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4116 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4119 Version 1.22.1 (2017-11-22)
4120 ==========================
4122 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4124 [46183]: https://github.com/rust-lang/rust/pull/46183
4126 Version 1.22.0 (2017-11-22)
4127 ==========================
4131 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4132 - [Now accepts underscores in unicode escapes][43716]
4133 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4134 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4138 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4139 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4140 This should decrease compile times for debug builds.
4141 - [strict memory alignment now enabled on ARMv6][45094]
4142 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4146 - [Allow atomic operations up to 32 bits
4147 on `armv5te_unknown_linux_gnueabi`][44978]
4148 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4149 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4150 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4151 - [Properly detect overflow in `Instant += Duration`.][44220]
4152 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4153 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4154 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4161 - [Cargo will now build multi file examples in subdirectories of the `examples`
4162 folder that have a `main.rs` file.][cargo/4496]
4163 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4164 the old format will continue to work and can be updated with `cargo update`.
4165 - [Now supports vendoring git repositories][cargo/3992]
4169 - [`libbacktrace` is now available on Apple platforms.][44251]
4170 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4171 This now lets you specify that a given code example will fail to compile.
4175 - [The minimum Android version that rustc can build for has been bumped
4176 to `4.0` from `2.3`][45656]
4177 - [Allowing `T op= &T` for numeric types has broken some type
4178 inference cases][45480]
4181 [42526]: https://github.com/rust-lang/rust/pull/42526
4182 [43017]: https://github.com/rust-lang/rust/pull/43017
4183 [43716]: https://github.com/rust-lang/rust/pull/43716
4184 [43949]: https://github.com/rust-lang/rust/pull/43949
4185 [44015]: https://github.com/rust-lang/rust/pull/44015
4186 [44220]: https://github.com/rust-lang/rust/pull/44220
4187 [44251]: https://github.com/rust-lang/rust/pull/44251
4188 [44287]: https://github.com/rust-lang/rust/pull/44287
4189 [44303]: https://github.com/rust-lang/rust/pull/44303
4190 [44456]: https://github.com/rust-lang/rust/pull/44456
4191 [44466]: https://github.com/rust-lang/rust/pull/44466
4192 [44895]: https://github.com/rust-lang/rust/pull/44895
4193 [44966]: https://github.com/rust-lang/rust/pull/44966
4194 [44978]: https://github.com/rust-lang/rust/pull/44978
4195 [45041]: https://github.com/rust-lang/rust/pull/45041
4196 [45064]: https://github.com/rust-lang/rust/pull/45064
4197 [45075]: https://github.com/rust-lang/rust/pull/45075
4198 [45094]: https://github.com/rust-lang/rust/pull/45094
4199 [45095]: https://github.com/rust-lang/rust/pull/45095
4200 [45480]: https://github.com/rust-lang/rust/issues/45480
4201 [45656]: https://github.com/rust-lang/rust/pull/45656
4202 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4203 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4204 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4211 Version 1.21.0 (2017-10-12)
4212 ==========================
4216 - [You can now use static references for literals.][43838]
4220 let x: &'static u32 = &0;
4223 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4226 my_macro!(Vec<i32>::new); // Always worked
4227 my_macro!(Vec::<i32>::new); // Now works
4232 - [Upgraded jemalloc to 4.5.0][43911]
4233 - [Enabled unwinding panics on Redox][43917]
4234 - [Now runs LLVM in parallel during translation phase.][43506]
4235 This should reduce peak memory usage.
4239 - [Generate builtin impls for `Clone` for all arrays and tuples that
4240 are `T: Clone`][43690]
4241 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4242 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4243 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4248 [`std::mem::discriminant`]
4252 - [You can now call `cargo install` with multiple package names][cargo/4216]
4253 - [Cargo commands inside a virtual workspace will now implicitly
4254 pass `--all`][cargo/4335]
4255 - [Added a `[patch]` section to `Cargo.toml` to handle
4256 prepublication dependencies][cargo/4123] [RFC 1969]
4257 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4258 like patterns][cargo/4270]
4259 - [Added the `--all-targets` option][cargo/4400]
4260 - [Using required dependencies as a feature is now deprecated and emits
4261 a warning][cargo/4364]
4266 - [Cargo docs are moving][43916]
4267 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4268 - [The rustdoc book is now available][43863]
4269 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4270 - [Added a preview of RLS has been made available through rustup][44204]
4271 Install with `rustup component add rls-preview`
4272 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4273 Previously only showed `std::os::unix`.
4277 - [Changes in method matching against higher-ranked types][43880] This may cause
4278 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4279 - [rustc's JSON error output's byte position start at top of file.][42973]
4280 Was previously relative to the rustc's internal `CodeMap` struct which
4281 required the unstable library `libsyntax` to correctly use.
4282 - [`unused_results` lint no longer ignores booleans][43728]
4284 [42565]: https://github.com/rust-lang/rust/pull/42565
4285 [42973]: https://github.com/rust-lang/rust/pull/42973
4286 [43348]: https://github.com/rust-lang/rust/pull/43348
4287 [43459]: https://github.com/rust-lang/rust/pull/43459
4288 [43506]: https://github.com/rust-lang/rust/pull/43506
4289 [43540]: https://github.com/rust-lang/rust/pull/43540
4290 [43690]: https://github.com/rust-lang/rust/pull/43690
4291 [43728]: https://github.com/rust-lang/rust/pull/43728
4292 [43838]: https://github.com/rust-lang/rust/pull/43838
4293 [43863]: https://github.com/rust-lang/rust/pull/43863
4294 [43880]: https://github.com/rust-lang/rust/pull/43880
4295 [43911]: https://github.com/rust-lang/rust/pull/43911
4296 [43916]: https://github.com/rust-lang/rust/pull/43916
4297 [43917]: https://github.com/rust-lang/rust/pull/43917
4298 [44204]: https://github.com/rust-lang/rust/pull/44204
4299 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4300 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4301 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4302 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4303 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4304 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4305 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4306 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4307 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4309 Version 1.20.0 (2017-08-31)
4310 ===========================
4314 - [Associated constants are now stabilised.][42809]
4315 - [A lot of macro bugs are now fixed.][42913]
4320 - [Struct fields are now properly coerced to the expected field type.][42807]
4321 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4322 `wasm32-experimental-emscripten` target.
4323 - [Changed some of the error messages to be more helpful.][42033]
4324 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4326 - [rustc now reports the total number of errors on compilation failure][43015]
4327 previously this was only the number of errors in the pass that failed.
4328 - [Expansion in rustc has been sped up 29x.][42533]
4329 - [added `msp430-none-elf` target.][43099]
4330 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4332 - [Fixes backtraces on Redox][43228]
4333 - [rustc now identifies different versions of same crate when absolute paths of
4334 different types match in an error message.][42826]
4340 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4341 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4343 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4344 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4345 - [Impl `Clone` for `DefaultHasher`.][42799]
4346 - [Impl `Sync` for `SyncSender`.][42397]
4347 - [Impl `FromStr` for `char`][42271]
4348 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4350 - [allow messages in the `unimplemented!()` macro.][42155]
4351 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4352 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4353 - [Upgrade to Unicode 10.0.0][42999]
4354 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4355 - [Skip the main thread's manual stack guard on Linux][43072]
4356 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4357 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4359 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4364 - [`CStr::into_c_string`]
4365 - [`CString::as_c_str`]
4366 - [`CString::into_boxed_c_str`]
4367 - [`Chain::get_mut`]
4368 - [`Chain::get_ref`]
4369 - [`Chain::into_inner`]
4370 - [`Option::get_or_insert_with`]
4371 - [`Option::get_or_insert`]
4372 - [`OsStr::into_os_string`]
4373 - [`OsString::into_boxed_os_str`]
4376 - [`Utf8Error::error_len`]
4377 - [`char::EscapeDebug`]
4378 - [`char::escape_debug`]
4379 - [`compile_error!`]
4380 - [`f32::from_bits`]
4382 - [`f64::from_bits`]
4384 - [`mem::ManuallyDrop`]
4385 - [`slice::sort_unstable_by_key`]
4386 - [`slice::sort_unstable_by`]
4387 - [`slice::sort_unstable`]
4388 - [`str::from_boxed_utf8_unchecked`]
4389 - [`str::as_bytes_mut`]
4390 - [`str::as_bytes_mut`]
4391 - [`str::from_utf8_mut`]
4392 - [`str::from_utf8_unchecked_mut`]
4394 - [`str::get_unchecked_mut`]
4395 - [`str::get_unchecked`]
4397 - [`str::into_boxed_bytes`]
4402 - [Cargo API token location moved from `~/.cargo/config` to
4403 `~/.cargo/credentials`.][cargo/3978]
4404 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4405 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4406 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4407 - [You can now specify version of a binary when installed through
4408 `cargo install` using `--vers`.][cargo/4229]
4409 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4410 failure.][cargo/4248]
4411 - [Changed the convention around which file is the crate root.][cargo/4259]
4412 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4413 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4418 - [Functions with `'static` in their return types will now not be as usable as
4419 if they were using lifetime parameters instead.][42417]
4420 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4421 takes the sign of NaN into account where previously didn't.][42430]
4423 [42033]: https://github.com/rust-lang/rust/pull/42033
4424 [42155]: https://github.com/rust-lang/rust/pull/42155
4425 [42271]: https://github.com/rust-lang/rust/pull/42271
4426 [42397]: https://github.com/rust-lang/rust/pull/42397
4427 [42417]: https://github.com/rust-lang/rust/pull/42417
4428 [42430]: https://github.com/rust-lang/rust/pull/42430
4429 [42431]: https://github.com/rust-lang/rust/pull/42431
4430 [42533]: https://github.com/rust-lang/rust/pull/42533
4431 [42571]: https://github.com/rust-lang/rust/pull/42571
4432 [42613]: https://github.com/rust-lang/rust/pull/42613
4433 [42799]: https://github.com/rust-lang/rust/pull/42799
4434 [42807]: https://github.com/rust-lang/rust/pull/42807
4435 [42809]: https://github.com/rust-lang/rust/pull/42809
4436 [42822]: https://github.com/rust-lang/rust/pull/42822
4437 [42826]: https://github.com/rust-lang/rust/pull/42826
4438 [42854]: https://github.com/rust-lang/rust/pull/42854
4439 [42913]: https://github.com/rust-lang/rust/pull/42913
4440 [42999]: https://github.com/rust-lang/rust/pull/42999
4441 [43011]: https://github.com/rust-lang/rust/pull/43011
4442 [43015]: https://github.com/rust-lang/rust/pull/43015
4443 [43072]: https://github.com/rust-lang/rust/pull/43072
4444 [43077]: https://github.com/rust-lang/rust/pull/43077
4445 [43097]: https://github.com/rust-lang/rust/pull/43097
4446 [43099]: https://github.com/rust-lang/rust/pull/43099
4447 [43170]: https://github.com/rust-lang/rust/pull/43170
4448 [43178]: https://github.com/rust-lang/rust/pull/43178
4449 [43185]: https://github.com/rust-lang/rust/pull/43185
4450 [43228]: https://github.com/rust-lang/rust/pull/43228
4451 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4452 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4453 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4454 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4455 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4456 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4457 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4458 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4459 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4460 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4461 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4462 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4463 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4464 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4465 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4466 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4467 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4468 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4469 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4470 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4471 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4472 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4473 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4474 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4475 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4476 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4477 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4478 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4479 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4480 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4481 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4482 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4483 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4484 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4485 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4486 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4487 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4488 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4489 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4492 Version 1.19.0 (2017-07-20)
4493 ===========================
4498 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4499 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4500 - [Macro recursion limit increased to 1024 from 64.][41676]
4501 - [Added lint for detecting unused macros.][41907]
4502 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4503 For example: `let x = loop { break 7; };`
4504 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4505 contain `Copy` types and cannot have a `Drop` implementation.
4506 Example: `union Foo { bar: u8, baz: usize }`
4507 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4508 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4513 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4514 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4515 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4516 you should use `--target armv7-linux-androideabi`.
4517 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4518 - [Minor optimisation of string operations.][42037]
4519 - [Compiler error message is now `aborting due to previous error(s)` instead of
4520 `aborting due to N previous errors`][42150] This was previously inaccurate and
4521 would only count certain kinds of errors.
4522 - [The compiler now supports Visual Studio 2017][42225]
4523 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4524 - [Added a lot][42264] of [new error codes][42302]
4525 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4526 libraries with C Run-time Libraries(CRT) to be statically linked.
4527 - [Fixed various ARM codegen bugs][42740]
4532 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4533 `Extend<Cow<'a, str>>`][41449]
4534 - [`Vec` now implements `From<&mut [T]>`][41530]
4535 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4536 - [`SplitWhitespace` now implements `Clone`][41659]
4537 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4539 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4540 macros, but for printing to stderr.
4545 - [`OsString::shrink_to_fit`]
4548 - [`thread::ThreadId`]
4553 - [Build scripts can now add environment variables to the environment
4554 the crate is being compiled in.
4555 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4556 - [Subcommands now replace the current process rather than spawning a new
4557 child process][cargo/3970]
4558 - [Workspace members can now accept glob file patterns][cargo/3979]
4559 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4560 the members in a given workspace.][cargo/3988]
4561 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4562 - [Target directory path is now in the cargo metadata][cargo/4022]
4563 - [Cargo no longer checks out a local working directory for the
4564 crates.io index][cargo/4026] This should provide smaller file size for the
4565 registry, and improve cloning times, especially on Windows machines.
4566 - [Added an `--exclude` option for excluding certain packages when using the
4567 `--all` option][cargo/4031]
4568 - [Cargo will now automatically retry when receiving a 5xx error
4569 from crates.io][cargo/4032]
4570 - [The `--features` option now accepts multiple comma or space
4571 delimited values.][cargo/4084]
4572 - [Added support for custom target specific runners][cargo/3954]
4577 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4579 - [Rust will now release XZ compressed packages][rust-installer/57]
4580 - [rustup will now prefer to download rust packages with
4581 XZ compression][rustup/1100] over GZip packages.
4582 - [Added the ability to escape `#` in rust documentation][41785] By adding
4583 additional `#`'s ie. `##` is now `#`
4588 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4589 - [`-Z` flags are now no longer allowed to be used on the stable
4590 compiler.][41751] This has been a warning for a year previous to this.
4591 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4592 longer works][42844]. Users should migrate to the built-in `check`
4593 command, which has been available since 1.16.
4594 - [Ending a float literal with `._` is now a hard error.
4595 Example: `42._` .][41946]
4596 - [Any use of a private `extern crate` outside of its module is now a
4597 hard error.][36886] This was previously a warning.
4598 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4599 relative while the `::` prefix makes a path absolute, but was ignored and the
4600 path was relative regardless.
4601 - [Floating point constants in match patterns is now a hard error][36890]
4602 This was previously a warning.
4603 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4604 match patterns is now a hard error][36891] This was previously a warning.
4605 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4607 - [From the pound escape, lines consisting of multiple `#`s are
4609 - [It is an error to re-export private enum variants][42460]. This is
4610 known to break a number of crates that depend on an older version of
4612 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4613 to use it to find the linker, and the build will fail where it did
4614 not previously][42607]
4616 [36886]: https://github.com/rust-lang/rust/issues/36886
4617 [36888]: https://github.com/rust-lang/rust/issues/36888
4618 [36890]: https://github.com/rust-lang/rust/issues/36890
4619 [36891]: https://github.com/rust-lang/rust/issues/36891
4620 [36892]: https://github.com/rust-lang/rust/issues/36892
4621 [37406]: https://github.com/rust-lang/rust/issues/37406
4622 [39983]: https://github.com/rust-lang/rust/pull/39983
4623 [41145]: https://github.com/rust-lang/rust/pull/41145
4624 [41192]: https://github.com/rust-lang/rust/pull/41192
4625 [41258]: https://github.com/rust-lang/rust/pull/41258
4626 [41370]: https://github.com/rust-lang/rust/pull/41370
4627 [41449]: https://github.com/rust-lang/rust/pull/41449
4628 [41530]: https://github.com/rust-lang/rust/pull/41530
4629 [41624]: https://github.com/rust-lang/rust/pull/41624
4630 [41656]: https://github.com/rust-lang/rust/pull/41656
4631 [41659]: https://github.com/rust-lang/rust/pull/41659
4632 [41676]: https://github.com/rust-lang/rust/pull/41676
4633 [41751]: https://github.com/rust-lang/rust/pull/41751
4634 [41764]: https://github.com/rust-lang/rust/pull/41764
4635 [41785]: https://github.com/rust-lang/rust/pull/41785
4636 [41873]: https://github.com/rust-lang/rust/pull/41873
4637 [41907]: https://github.com/rust-lang/rust/pull/41907
4638 [41946]: https://github.com/rust-lang/rust/pull/41946
4639 [42016]: https://github.com/rust-lang/rust/pull/42016
4640 [42037]: https://github.com/rust-lang/rust/pull/42037
4641 [42068]: https://github.com/rust-lang/rust/pull/42068
4642 [42150]: https://github.com/rust-lang/rust/pull/42150
4643 [42162]: https://github.com/rust-lang/rust/pull/42162
4644 [42225]: https://github.com/rust-lang/rust/pull/42225
4645 [42264]: https://github.com/rust-lang/rust/pull/42264
4646 [42302]: https://github.com/rust-lang/rust/pull/42302
4647 [42460]: https://github.com/rust-lang/rust/issues/42460
4648 [42607]: https://github.com/rust-lang/rust/issues/42607
4649 [42740]: https://github.com/rust-lang/rust/pull/42740
4650 [42844]: https://github.com/rust-lang/rust/issues/42844
4651 [42948]: https://github.com/rust-lang/rust/pull/42948
4652 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4653 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4654 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4655 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4656 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4657 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4658 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4659 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4660 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4661 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4662 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4663 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4664 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4665 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4666 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4667 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4668 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4669 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4670 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4671 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4672 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4673 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4676 Version 1.18.0 (2017-06-08)
4677 ===========================
4682 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4683 make the item visible to just that module tree. Also accepts the keyword
4684 `crate` to make something public to the whole crate but not users of the
4685 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4686 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4687 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4688 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4689 types like `Write + Send`, trailing `+` are now supported in trait objects,
4690 and better error reporting for trait objects starting with `?Sized`.
4691 - [0e+10 is now a valid floating point literal][40589]
4692 - [Now warns if you bind a lifetime parameter to 'static][40734]
4693 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4694 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4695 representation in some cases.][40377]
4700 - [rustc can now emit mir with `--emit mir`][39891]
4701 - [Improved LLVM IR for trivial functions][40367]
4702 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4703 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4704 opportunities found through profiling
4705 - [Improved backtrace formatting when panicking][38165]
4710 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4711 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4712 iteration or reallocation.
4713 - [Simplified HashMap Bucket interface][40561] provides performance
4714 improvements for iterating and cloning.
4715 - [Specialize Vec::from_elem to use calloc][40409]
4716 - [Fixed Race condition in fs::create_dir_all][39799]
4717 - [No longer caching stdio on Windows][40516]
4718 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4719 2.50%~ faster and in one case now 12.50% faster.
4720 - [Optimized `AtomicBool::fetch_nand`][41143]
4725 - [`Child::try_wait`]
4726 - [`HashMap::retain`]
4727 - [`HashSet::retain`]
4729 - [`TcpStream::peek`]
4730 - [`UdpSocket::peek`]
4731 - [`UdpSocket::peek_from`]
4736 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4737 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4738 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4739 - [Added Android build support][cargo/3885]
4740 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4741 of a certain type, for example `cargo build --bins` will build all
4743 - [Added support for haiku][cargo/3952]
4748 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4749 - [Added rust-windbg script for better debugging on Windows][39983]
4750 - [Rust now uses the official cross compiler for NetBSD][40612]
4751 - [rustdoc now accepts `#` at the start of files][40828]
4752 - [Fixed jemalloc support for musl][41168]
4757 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4758 always placed after the sign if it exists and before the digits. With the `#`
4759 flag the zeroes are placed after the prefix and before the digits.
4760 - [Due to the struct field optimisation][40377], using `transmute` on structs
4761 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4762 always been undefined behavior, but is now more likely to break in practice.
4763 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4764 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4765 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4766 - [Overlapping inherent `impl`s are now a hard error][40728]
4767 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4768 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4769 `out.asm` and `out.ll` instead of only one of the filetypes.
4770 - [ calling a function that returns `Self` will no longer work][41805] when
4771 the size of `Self` cannot be statically determined.
4772 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4773 this has caused a few regressions namely:
4775 - Changed the link order of local static/dynamic libraries (respecting the
4776 order on given rather than having the compiler reorder).
4777 - Changed how MinGW is linked, native code linked to dynamic libraries
4778 may require manually linking to the gcc support library (for the native
4781 [38165]: https://github.com/rust-lang/rust/pull/38165
4782 [39799]: https://github.com/rust-lang/rust/pull/39799
4783 [39891]: https://github.com/rust-lang/rust/pull/39891
4784 [39983]: https://github.com/rust-lang/rust/pull/39983
4785 [40043]: https://github.com/rust-lang/rust/pull/40043
4786 [40241]: https://github.com/rust-lang/rust/pull/40241
4787 [40338]: https://github.com/rust-lang/rust/pull/40338
4788 [40367]: https://github.com/rust-lang/rust/pull/40367
4789 [40377]: https://github.com/rust-lang/rust/pull/40377
4790 [40409]: https://github.com/rust-lang/rust/pull/40409
4791 [40516]: https://github.com/rust-lang/rust/pull/40516
4792 [40556]: https://github.com/rust-lang/rust/pull/40556
4793 [40561]: https://github.com/rust-lang/rust/pull/40561
4794 [40589]: https://github.com/rust-lang/rust/pull/40589
4795 [40612]: https://github.com/rust-lang/rust/pull/40612
4796 [40723]: https://github.com/rust-lang/rust/pull/40723
4797 [40728]: https://github.com/rust-lang/rust/pull/40728
4798 [40731]: https://github.com/rust-lang/rust/pull/40731
4799 [40734]: https://github.com/rust-lang/rust/pull/40734
4800 [40805]: https://github.com/rust-lang/rust/pull/40805
4801 [40807]: https://github.com/rust-lang/rust/pull/40807
4802 [40828]: https://github.com/rust-lang/rust/pull/40828
4803 [40870]: https://github.com/rust-lang/rust/pull/40870
4804 [41085]: https://github.com/rust-lang/rust/pull/41085
4805 [41143]: https://github.com/rust-lang/rust/pull/41143
4806 [41168]: https://github.com/rust-lang/rust/pull/41168
4807 [41270]: https://github.com/rust-lang/rust/issues/41270
4808 [41469]: https://github.com/rust-lang/rust/pull/41469
4809 [41805]: https://github.com/rust-lang/rust/issues/41805
4810 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4811 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4812 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4813 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4814 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4815 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4816 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4817 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4818 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4819 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4820 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4821 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4822 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4823 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4826 Version 1.17.0 (2017-04-27)
4827 ===========================
4832 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4833 * [Fields of structs may be initialized without duplicating the field/variable
4834 names][39761]. [RFC 1682]
4835 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4836 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4837 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4838 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4839 `'b`. Soundness fix.
4840 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4841 * [Static variables may contain references to other statics][40027]
4846 * [Exit quickly on only `--emit dep-info`][40336]
4847 * [Make `-C relocation-model` more correctly determine whether the linker
4848 creates a position-independent executable][40245]
4849 * [Add `-C overflow-checks` to directly control whether integer overflow
4851 * [The rustc type checker now checks items on demand instead of in a single
4852 in-order pass][40008]. This is mostly an internal refactoring in support of
4853 future work, including incremental type checking, but also resolves [RFC
4854 1647], allowing `Self` to appear in `impl` `where` clauses.
4855 * [Optimize vtable loads][39995]
4856 * [Turn off vectorization for Emscripten targets][39990]
4857 * [Provide suggestions for unknown macros imported with `use`][39953]
4858 * [Fix ICEs in path resolution][39939]
4859 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4860 * [Add clearer error message using `&str + &str`][39116]
4871 * [`Ordering::then`]
4872 * [`Ordering::then_with`]
4873 * [`BTreeMap::range`]
4874 * [`BTreeMap::range_mut`]
4875 * [`collections::Bound`]
4876 * [`process::abort`]
4877 * [`ptr::read_unaligned`]
4878 * [`ptr::write_unaligned`]
4879 * [`Result::expect_err`]
4882 * [`Cell::into_inner`]
4888 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4889 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4890 * [`String` implements `FromIterator<&char>`][40028]
4891 * `Box` [implements][40009] a number of new conversions:
4892 `From<Box<str>> for String`,
4893 `From<Box<[T]>> for Vec<T>`,
4894 `From<Box<CStr>> for CString`,
4895 `From<Box<OsStr>> for OsString`,
4896 `From<Box<Path>> for PathBuf`,
4897 `Into<Box<str>> for String`,
4898 `Into<Box<[T]>> for Vec<T>`,
4899 `Into<Box<CStr>> for CString`,
4900 `Into<Box<OsStr>> for OsString`,
4901 `Into<Box<Path>> for PathBuf`,
4902 `Default for Box<str>`,
4903 `Default for Box<CStr>`,
4904 `Default for Box<OsStr>`,
4905 `From<&CStr> for Box<CStr>`,
4906 `From<&OsStr> for Box<OsStr>`,
4907 `From<&Path> for Box<Path>`
4908 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4909 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4910 * [Slightly optimize `slice::sort`][39538]
4911 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4912 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4913 `Box<str>` implements `From<&str>`][39438]
4914 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4915 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4916 * [`format!` estimates the needed capacity before writing a string][39356]
4917 * [Support unprivileged symlink creation in Windows][38921]
4918 * [`PathBuf` implements `Default`][38764]
4919 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4920 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4921 and poor hash functions.
4926 * [Add `cargo check --all`][cargo/3731]
4927 * [Add an option to ignore SSL revocation checking][cargo/3699]
4928 * [Add `cargo run --package`][cargo/3691]
4929 * [Add `required_features`][cargo/3667]
4930 * [Assume `build.rs` is a build script][cargo/3664]
4931 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4936 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4938 * [The "Unstable Book" documents nightly-only features][ubook]
4939 * [Improve the style of the sidebar in rustdoc output][40265]
4940 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4941 * [Fix MSP430 breakage due to `i128`][40257]
4942 * [Preliminary Solaris/SPARCv9 support][39903]
4943 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4944 run without installing the MSVC runtime.
4945 * [`rustdoc --test` includes file names in test names][39788]
4946 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4947 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4948 * [Initial support for `aarch64-unknown-freebsd`][39491]
4949 * [Initial support for `i686-unknown-netbsd`][39426]
4950 * [This release no longer includes the old makefile build system][39431]. Rust
4951 is built with a custom build system, written in Rust, and with Cargo.
4952 * [Add Debug implementations for libcollection structs][39002]
4953 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4954 * [`--test-threads=0` produces an error][38945]
4955 * [`rustup` installs documentation by default][40526]
4956 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4957 WinDbg and Visual Studio to improve the debugging experience.
4962 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4963 workaround, either use MSVC 2015 or run vcvars.bat.
4964 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4965 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4966 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4968 * [`format!` and `Display::to_string` panic if an underlying formatting
4969 implementation returns an error][40117]. Previously the error was silently
4970 ignored. It is incorrect for `write_fmt` to return an error when writing
4972 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4973 crates were marked stable and could be accessed from the stable toolchain.
4974 * [Rust git source no longer includes vendored crates][39728]. Those that need
4975 to build with vendored crates should build from release tarballs.
4976 * [Fix inert attributes from `proc_macro_derives`][39572]
4977 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4978 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4980 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4981 existing code generally ignores the type of dead-code unless a type-hint is
4982 provided; this can cause surprising inference interactions particularly around
4983 defaulting. The new code uniformly ignores the result type of dead-code.
4984 * [Tuple-struct constructors with private fields are no longer visible][38932]
4985 * [Lifetime parameters that do not appear in the arguments are now considered
4986 early-bound][38897], resolving a soundness bug (#[32330]). The
4987 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4989 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4990 * [Make transmuting from fn item types to pointer-sized types a hard
4993 [27787]: https://github.com/rust-lang/rust/issues/27787
4994 [32330]: https://github.com/rust-lang/rust/issues/32330
4995 [34198]: https://github.com/rust-lang/rust/pull/34198
4996 [38161]: https://github.com/rust-lang/rust/pull/38161
4997 [38368]: https://github.com/rust-lang/rust/pull/38368
4998 [38584]: https://github.com/rust-lang/rust/issues/38584
4999 [38661]: https://github.com/rust-lang/rust/pull/38661
5000 [38764]: https://github.com/rust-lang/rust/pull/38764
5001 [38864]: https://github.com/rust-lang/rust/issues/38864
5002 [38897]: https://github.com/rust-lang/rust/pull/38897
5003 [38921]: https://github.com/rust-lang/rust/pull/38921
5004 [38932]: https://github.com/rust-lang/rust/pull/38932
5005 [38945]: https://github.com/rust-lang/rust/pull/38945
5006 [38981]: https://github.com/rust-lang/rust/pull/38981
5007 [39002]: https://github.com/rust-lang/rust/pull/39002
5008 [39116]: https://github.com/rust-lang/rust/pull/39116
5009 [39193]: https://github.com/rust-lang/rust/pull/39193
5010 [39265]: https://github.com/rust-lang/rust/pull/39265
5011 [39356]: https://github.com/rust-lang/rust/pull/39356
5012 [39372]: https://github.com/rust-lang/rust/pull/39372
5013 [39426]: https://github.com/rust-lang/rust/pull/39426
5014 [39431]: https://github.com/rust-lang/rust/pull/39431
5015 [39438]: https://github.com/rust-lang/rust/pull/39438
5016 [39440]: https://github.com/rust-lang/rust/pull/39440
5017 [39485]: https://github.com/rust-lang/rust/pull/39485
5018 [39491]: https://github.com/rust-lang/rust/pull/39491
5019 [39518]: https://github.com/rust-lang/rust/pull/39518
5020 [39538]: https://github.com/rust-lang/rust/pull/39538
5021 [39572]: https://github.com/rust-lang/rust/pull/39572
5022 [39633]: https://github.com/rust-lang/rust/pull/39633
5023 [39642]: https://github.com/rust-lang/rust/pull/39642
5024 [39728]: https://github.com/rust-lang/rust/pull/39728
5025 [39761]: https://github.com/rust-lang/rust/pull/39761
5026 [39788]: https://github.com/rust-lang/rust/pull/39788
5027 [39793]: https://github.com/rust-lang/rust/pull/39793
5028 [39837]: https://github.com/rust-lang/rust/pull/39837
5029 [39843]: https://github.com/rust-lang/rust/pull/39843
5030 [39851]: https://github.com/rust-lang/rust/pull/39851
5031 [39903]: https://github.com/rust-lang/rust/pull/39903
5032 [39939]: https://github.com/rust-lang/rust/pull/39939
5033 [39953]: https://github.com/rust-lang/rust/pull/39953
5034 [39960]: https://github.com/rust-lang/rust/pull/39960
5035 [39990]: https://github.com/rust-lang/rust/pull/39990
5036 [39995]: https://github.com/rust-lang/rust/pull/39995
5037 [40008]: https://github.com/rust-lang/rust/pull/40008
5038 [40009]: https://github.com/rust-lang/rust/pull/40009
5039 [40027]: https://github.com/rust-lang/rust/pull/40027
5040 [40028]: https://github.com/rust-lang/rust/pull/40028
5041 [40037]: https://github.com/rust-lang/rust/pull/40037
5042 [40117]: https://github.com/rust-lang/rust/pull/40117
5043 [40166]: https://github.com/rust-lang/rust/pull/40166
5044 [40245]: https://github.com/rust-lang/rust/pull/40245
5045 [40257]: https://github.com/rust-lang/rust/pull/40257
5046 [40261]: https://github.com/rust-lang/rust/pull/40261
5047 [40265]: https://github.com/rust-lang/rust/pull/40265
5048 [40319]: https://github.com/rust-lang/rust/pull/40319
5049 [40336]: https://github.com/rust-lang/rust/pull/40336
5050 [40526]: https://github.com/rust-lang/rust/pull/40526
5051 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5052 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5053 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5054 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5055 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5056 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5057 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5058 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5059 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5060 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5061 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5062 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5063 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5064 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5065 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5066 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5067 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5068 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5069 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5070 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5071 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5072 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5073 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5074 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5075 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5076 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5077 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5078 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5079 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5080 [mdbook]: https://crates.io/crates/mdbook
5081 [ubook]: https://doc.rust-lang.org/unstable-book/
5084 Version 1.16.0 (2017-03-16)
5085 ===========================
5090 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5091 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5092 match patterns][38069]
5093 * [Clean up semantics of `self` in an import list][38313]
5094 * [`Self` may appear in `impl` headers][38920]
5095 * [`Self` may appear in struct expressions][39282]
5100 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5101 a `.rmeta` file containing only crate metadata][38571]. This can be
5102 used by tools like the Rust Language Service to perform
5103 metadata-only builds.
5104 * [Levenshtein based typo suggestions now work in most places, while
5105 previously they worked only for fields and sometimes for local
5106 variables][38927]. Together with the overhaul of "no
5107 resolution"/"unexpected resolution" errors (#[38154]) they result in
5108 large and systematic improvement in resolution diagnostics.
5109 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5111 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5112 * [`rustc` no longer attempts to provide "consider using an explicit
5113 lifetime" suggestions][37057]. They were inaccurate.
5118 * [`VecDeque::truncate`]
5119 * [`VecDeque::resize`]
5120 * [`String::insert_str`]
5121 * [`Duration::checked_add`]
5122 * [`Duration::checked_sub`]
5123 * [`Duration::checked_div`]
5124 * [`Duration::checked_mul`]
5127 * [`SocketAddr::is_ipv4`]
5128 * [`SocketAddr::is_ipv6`]
5129 * [`IpAddr::is_ipv4`]
5130 * [`IpAddr::is_ipv6`]
5132 * [`Vec::dedup_by_key`]
5133 * [`Result::unwrap_or_default`]
5134 * [`<*const T>::wrapping_offset`]
5135 * [`<*mut T>::wrapping_offset`]
5136 * `CommandExt::creation_flags`
5137 * [`File::set_permissions`]
5138 * [`String::split_off`]
5143 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5144 their argument by `Borrow` parameter][37761]
5145 * [All public types in std implement `Debug`][38006]
5146 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5147 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5148 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5150 * [std: Fix partial writes in `LineWriter`][38062]
5151 * [std: Clamp max read/write sizes on Unix][38062]
5152 * [Use more specific panic message for `&str` slicing errors][38066]
5153 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5154 functionality cannot be achieved in std currently.
5155 * [`writeln!`, like `println!`, now accepts a form with no string
5156 or formatting arguments, to just print a newline][38469]
5157 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5158 * [Reduce the size of static data in `std_unicode::tables`][38781]
5159 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5160 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5162 * [`Duration` implements `Sum`][38712]
5163 * [`String` implements `ToSocketAddrs`][39048]
5168 * [The `cargo check` command does a type check of a project without
5169 building it][cargo/3296]
5170 * [crates.io will display CI badges from Travis and AppVeyor, if
5171 specified in Cargo.toml][cargo/3546]
5172 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5173 * [Compilation profiles accept integer values for `debug`, in addition
5174 to `true` and `false`. These are passed to `rustc` as the value to
5175 `-C debuginfo`][cargo/3534]
5176 * [Implement `cargo --version --verbose`][cargo/3604]
5177 * [All builds now output 'dep-info' build dependencies compatible with
5178 make and ninja][cargo/3557]
5179 * [Build all workspace members with `build --all`][cargo/3511]
5180 * [Document all workspace members with `doc --all`][cargo/3515]
5181 * [Path deps outside workspace are not members][cargo/3443]
5186 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5187 the path to the Rust implementation][38589]
5188 * [The `armv7-linux-androideabi` target no longer enables NEON
5189 extensions, per Google's ABI guide][38413]
5190 * [The stock standard library can be compiled for Redox OS][38401]
5191 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5193 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5195 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5200 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5201 match patterns][38069]
5202 * In this release, references to uninhabited types can not be
5203 pattern-matched. This was accidentally allowed in 1.15.
5204 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5205 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5207 * [Clean up semantics of `self` in an import list][38313]
5208 * Reimplemented lifetime elision. This change was almost entirely compatible
5209 with existing code, but it did close a number of small bugs and loopholes,
5210 as well as being more accepting in some other [cases][41105].
5212 [37057]: https://github.com/rust-lang/rust/pull/37057
5213 [37761]: https://github.com/rust-lang/rust/pull/37761
5214 [38006]: https://github.com/rust-lang/rust/pull/38006
5215 [38051]: https://github.com/rust-lang/rust/pull/38051
5216 [38062]: https://github.com/rust-lang/rust/pull/38062
5217 [38062]: https://github.com/rust-lang/rust/pull/38622
5218 [38066]: https://github.com/rust-lang/rust/pull/38066
5219 [38069]: https://github.com/rust-lang/rust/pull/38069
5220 [38131]: https://github.com/rust-lang/rust/pull/38131
5221 [38154]: https://github.com/rust-lang/rust/pull/38154
5222 [38274]: https://github.com/rust-lang/rust/pull/38274
5223 [38304]: https://github.com/rust-lang/rust/pull/38304
5224 [38313]: https://github.com/rust-lang/rust/pull/38313
5225 [38314]: https://github.com/rust-lang/rust/pull/38314
5226 [38327]: https://github.com/rust-lang/rust/pull/38327
5227 [38401]: https://github.com/rust-lang/rust/pull/38401
5228 [38413]: https://github.com/rust-lang/rust/pull/38413
5229 [38469]: https://github.com/rust-lang/rust/pull/38469
5230 [38559]: https://github.com/rust-lang/rust/pull/38559
5231 [38571]: https://github.com/rust-lang/rust/pull/38571
5232 [38580]: https://github.com/rust-lang/rust/pull/38580
5233 [38589]: https://github.com/rust-lang/rust/pull/38589
5234 [38670]: https://github.com/rust-lang/rust/pull/38670
5235 [38712]: https://github.com/rust-lang/rust/pull/38712
5236 [38726]: https://github.com/rust-lang/rust/pull/38726
5237 [38781]: https://github.com/rust-lang/rust/pull/38781
5238 [38798]: https://github.com/rust-lang/rust/pull/38798
5239 [38909]: https://github.com/rust-lang/rust/pull/38909
5240 [38920]: https://github.com/rust-lang/rust/pull/38920
5241 [38927]: https://github.com/rust-lang/rust/pull/38927
5242 [39048]: https://github.com/rust-lang/rust/pull/39048
5243 [39282]: https://github.com/rust-lang/rust/pull/39282
5244 [39379]: https://github.com/rust-lang/rust/pull/39379
5245 [41105]: https://github.com/rust-lang/rust/issues/41105
5246 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5247 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5248 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5249 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5250 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5251 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5252 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5253 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5254 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5255 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5256 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5257 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5258 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5259 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5260 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5261 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5262 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5263 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5264 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5265 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5266 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5267 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5268 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5269 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5270 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5271 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5272 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5273 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5274 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5275 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5278 Version 1.15.1 (2017-02-09)
5279 ===========================
5281 * [Fix IntoIter::as_mut_slice's signature][39466]
5282 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5284 [39466]: https://github.com/rust-lang/rust/pull/39466
5285 [39523]: https://github.com/rust-lang/rust/pull/39523
5288 Version 1.15.0 (2017-02-02)
5289 ===========================
5294 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5295 stable. This allows popular code-generating crates like Serde and Diesel to
5296 work ergonomically. [RFC 1681].
5297 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5298 with curly braces][36868]. Part of [RFC 1506].
5299 * [A number of minor changes to name resolution have been activated][37127].
5300 They add up to more consistent semantics, allowing for future evolution of
5301 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5302 details of what is different. The breaking changes here have been transitioned
5303 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5304 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5306 * [`?Sized` can be used in `where` clauses][37791]
5307 * [There is now a limit on the size of monomorphized types and it can be
5308 modified with the `#![type_size_limit]` crate attribute, similarly to
5309 the `#![recursion_limit]` attribute][37789]
5314 * [On Windows, the compiler will apply dllimport attributes when linking to
5315 extern functions][37973]. Additional attributes and flags can control which
5316 library kind is linked and its name. [RFC 1717].
5317 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5318 * [The `--test` flag works with procedural macro crates][38107]
5319 * [Fix `extern "aapcs" fn` ABI][37814]
5320 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5321 * [The `format!` expander recognizes incorrect `printf` and shell-style
5322 formatting directives and suggests the correct format][37613].
5323 * [Only report one error for all unused imports in an import list][37456]
5325 Compiler Performance
5326 --------------------
5328 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5329 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5330 * [Don't clone in `UnificationTable::probe`][37848]
5331 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5332 * [Use small vectors in type walker][37760]
5333 * [Macro expansion performance was improved][37701]
5334 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5335 * [Replace FNV with a faster hash function][37229]
5340 * [`std::iter::Iterator::min_by`]
5341 * [`std::iter::Iterator::max_by`]
5342 * [`std::os::*::fs::FileExt`]
5343 * [`std::sync::atomic::Atomic*::get_mut`]
5344 * [`std::sync::atomic::Atomic*::into_inner`]
5345 * [`std::vec::IntoIter::as_slice`]
5346 * [`std::vec::IntoIter::as_mut_slice`]
5347 * [`std::sync::mpsc::Receiver::try_iter`]
5348 * [`std::os::unix::process::CommandExt::before_exec`]
5349 * [`std::rc::Rc::strong_count`]
5350 * [`std::rc::Rc::weak_count`]
5351 * [`std::sync::Arc::strong_count`]
5352 * [`std::sync::Arc::weak_count`]
5353 * [`std::char::encode_utf8`]
5354 * [`std::char::encode_utf16`]
5355 * [`std::cell::Ref::clone`]
5356 * [`std::io::Take::into_inner`]
5361 * [The standard sorting algorithm has been rewritten for dramatic performance
5362 improvements][38192]. It is a hybrid merge sort, drawing influences from
5363 Timsort. Previously it was a naive merge sort.
5364 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5365 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5367 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5368 and `char_indices().last()`][37882]
5369 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5370 * [Chinese characters display correctly in `fmt::Debug`][37855]
5371 * [Derive `Default` for `Duration`][37699]
5372 * [Support creation of anonymous pipes on WinXP/2k][37677]
5373 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5374 * [Don't pass overlapped handles to processes][38835]
5379 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5380 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5381 should instead check the variable at runtime with `std::env`. That the value
5382 was set at build time was a bug, and incorrect when cross-compiling. This
5383 change is known to cause breakage.
5384 * [Add `--all` flag to `cargo test`][cargo/3221]
5385 * [Compile statically against the MSVC CRT][cargo/3363]
5386 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5387 * [Link OpenSSL statically on OSX][cargo/3311]
5388 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5389 * [Test for bad path overrides with summaries][cargo/3336]
5390 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5391 * [Fix retrying crate downloads for network errors][cargo/3348]
5392 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5393 * [Emit more info on --message-format=json][cargo/3319]
5394 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5395 * [Don't ignore errors in workspace manifest][cargo/3409]
5396 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5401 * [Test runners (binaries built with `--test`) now support a `--list` argument
5402 that lists the tests it contains][38185]
5403 * [Test runners now support a `--exact` argument that makes the test filter
5404 match exactly, instead of matching only a substring of the test name][38181]
5405 * [rustdoc supports a `--playground-url` flag][37763]
5406 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5411 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5412 continue to be used in this release by passing `--disable-rustbuild` to the
5413 configure script, but they will be deleted soon. Note that the new build
5414 system uses a different on-disk layout that will likely affect any scripts
5416 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5418 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5419 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5425 * [A number of minor changes to name resolution have been activated][37127].
5426 They add up to more consistent semantics, allowing for future evolution of
5427 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5428 details of what is different. The breaking changes here have been transitioned
5429 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5430 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5431 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5432 should instead check the variable at runtime with `std::env`. That the value
5433 was set at build time was a bug, and incorrect when cross-compiling. This
5434 change is known to cause breakage.
5435 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5436 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5437 1.10 and is now an error by default. It will become a hard error in the near
5439 * [The semantics relating modules to file system directories are changing in
5440 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5441 lint, which is a warning in this release, and will become a hard error in the
5443 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5444 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5445 the underlying iterator][37834]
5447 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5448 [33685]: https://github.com/rust-lang/rust/issues/33685
5449 [36868]: https://github.com/rust-lang/rust/pull/36868
5450 [37127]: https://github.com/rust-lang/rust/pull/37127
5451 [37229]: https://github.com/rust-lang/rust/pull/37229
5452 [37456]: https://github.com/rust-lang/rust/pull/37456
5453 [37527]: https://github.com/rust-lang/rust/pull/37527
5454 [37602]: https://github.com/rust-lang/rust/pull/37602
5455 [37613]: https://github.com/rust-lang/rust/pull/37613
5456 [37615]: https://github.com/rust-lang/rust/pull/37615
5457 [37636]: https://github.com/rust-lang/rust/pull/37636
5458 [37627]: https://github.com/rust-lang/rust/pull/37627
5459 [37642]: https://github.com/rust-lang/rust/pull/37642
5460 [37677]: https://github.com/rust-lang/rust/pull/37677
5461 [37699]: https://github.com/rust-lang/rust/pull/37699
5462 [37701]: https://github.com/rust-lang/rust/pull/37701
5463 [37705]: https://github.com/rust-lang/rust/pull/37705
5464 [37749]: https://github.com/rust-lang/rust/pull/37749
5465 [37760]: https://github.com/rust-lang/rust/pull/37760
5466 [37763]: https://github.com/rust-lang/rust/pull/37763
5467 [37764]: https://github.com/rust-lang/rust/pull/37764
5468 [37789]: https://github.com/rust-lang/rust/pull/37789
5469 [37791]: https://github.com/rust-lang/rust/pull/37791
5470 [37814]: https://github.com/rust-lang/rust/pull/37814
5471 [37817]: https://github.com/rust-lang/rust/pull/37817
5472 [37834]: https://github.com/rust-lang/rust/pull/37834
5473 [37848]: https://github.com/rust-lang/rust/pull/37848
5474 [37855]: https://github.com/rust-lang/rust/pull/37855
5475 [37882]: https://github.com/rust-lang/rust/pull/37882
5476 [37888]: https://github.com/rust-lang/rust/pull/37888
5477 [37973]: https://github.com/rust-lang/rust/pull/37973
5478 [37979]: https://github.com/rust-lang/rust/pull/37979
5479 [38086]: https://github.com/rust-lang/rust/pull/38086
5480 [38107]: https://github.com/rust-lang/rust/pull/38107
5481 [38117]: https://github.com/rust-lang/rust/pull/38117
5482 [38134]: https://github.com/rust-lang/rust/pull/38134
5483 [38146]: https://github.com/rust-lang/rust/pull/38146
5484 [38181]: https://github.com/rust-lang/rust/pull/38181
5485 [38182]: https://github.com/rust-lang/rust/pull/38182
5486 [38185]: https://github.com/rust-lang/rust/pull/38185
5487 [38192]: https://github.com/rust-lang/rust/pull/38192
5488 [38279]: https://github.com/rust-lang/rust/pull/38279
5489 [38835]: https://github.com/rust-lang/rust/pull/38835
5490 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5491 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5492 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5493 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5494 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5495 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5496 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5497 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5498 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5499 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5500 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5501 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5502 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5503 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5504 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5505 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5506 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5507 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5508 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5509 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5510 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5511 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5512 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5513 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5514 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5515 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5516 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5517 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5518 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5519 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5520 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5521 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5522 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5523 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5524 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5525 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5526 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5527 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5530 Version 1.14.0 (2016-12-22)
5531 ===========================
5536 * [`..` matches multiple tuple fields in enum variants, structs
5537 and tuples][36843]. [RFC 1492].
5538 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5539 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5540 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5541 dereferencing][36822]
5546 * [Mark enums with non-zero discriminant as non-zero][37224]
5547 * [Lower-case `static mut` names are linted like other
5548 statics and consts][37162]
5549 * [Fix ICE on some macros in const integer positions
5550 (e.g. `[u8; m!()]`)][36819]
5551 * [Improve error message and snippet for "did you mean `x`"][36798]
5552 * [Add a panic-strategy field to the target specification][36794]
5553 * [Include LLVM version in `--version --verbose`][37200]
5555 Compile-time Optimizations
5556 --------------------------
5558 * [Improve macro expansion performance][37569]
5559 * [Shrink `Expr_::ExprInlineAsm`][37445]
5560 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5561 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5562 * [Avoid more allocations when compiling html5ever][37373]
5563 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5564 * [Avoid some allocations in the macro parser][37318]
5565 * [Use a faster deflate setting][37298]
5566 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5567 during interning of slices][37270]
5568 * [Optimize `write_metadata`][37267]
5569 * [Don't process obligation forest cycles when stalled][37231]
5570 * [Avoid many `CrateConfig` clones][37161]
5571 * [Optimize `Substs::super_fold_with`][37108]
5572 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5573 * [Speed up `plug_leaks`][36917]
5578 * [`println!()`, with no arguments, prints newline][36825].
5579 Previously, an empty string was required to achieve the same.
5580 * [`Wrapping` impls standard binary and unary operators, as well as
5581 the `Sum` and `Product` iterators][37356]
5582 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5584 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5585 `VecDeque` iterators][37315]
5586 * [Improve `SipHasher` performance on small values][37312]
5587 * [Add Iterator trait TrustedLen to enable better FromIterator /
5589 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5590 * [`ReadDir` implements `Debug`][37221]
5591 * [Implement `RefUnwindSafe` for atomic types][37178]
5592 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5593 * [Avoid allocations in `Decoder::read_str`][37064]
5594 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5595 * [Impl `Debug` for raw pointers to unsized data][36880]
5596 * [Don't reuse `HashMap` random seeds][37470]
5597 * [The internal memory layout of `HashMap` is more cache-friendly, for
5598 significant improvements in some operations][36692]
5599 * [`HashMap` uses less memory on 32-bit architectures][36595]
5600 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5605 * [Expose rustc cfg values to build scripts][cargo/3243]
5606 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5607 * [Fix passing --features when testing multiple packages][cargo/3280]
5608 * [Use a single profile set per workspace][cargo/3249]
5609 * [Load `replace` sections from lock files][cargo/3220]
5610 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5615 * [rustup is the recommended Rust installation method][1.14rustup]
5616 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5617 S390x. These are [tier 2] platforms and may have major defects. Follow the
5618 instructions on the website to install, or add the targets to an existing
5619 installation with `rustup target add`. The new target triples are:
5620 - `mips-unknown-linux-gnu`
5621 - `mipsel-unknown-linux-gnu`
5622 - `mips64-unknown-linux-gnuabi64`
5623 - `mips64el-unknown-linux-gnuabi64 `
5624 - `powerpc-unknown-linux-gnu`
5625 - `powerpc64-unknown-linux-gnu`
5626 - `powerpc64le-unknown-linux-gnu`
5627 - `s390x-unknown-linux-gnu `
5628 * This release includes target (std) builds for ARM Linux running MUSL
5629 libc. These are [tier 2] platforms and may have major defects. Add the
5630 following triples to an existing rustup installation with `rustup target add`:
5631 - `arm-unknown-linux-musleabi`
5632 - `arm-unknown-linux-musleabihf`
5633 - `armv7-unknown-linux-musleabihf`
5634 * This release includes [experimental support for WebAssembly][1.14wasm], via
5635 the `wasm32-unknown-emscripten` target. This target is known to have major
5636 defects. Please test, report, and fix.
5637 * rustup no longer installs documentation by default. Run `rustup
5638 component add rust-docs` to install.
5639 * [Fix line stepping in debugger][37310]
5640 * [Enable line number debuginfo in releases][37280]
5645 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5646 * [Add support for Fuchsia OS][37313]
5647 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5652 * [A number of forward-compatibility lints used by the compiler
5653 to gradually introduce language changes have been converted
5654 to deny by default][36894]:
5655 - ["use of inaccessible extern crate erroneously allowed"][36886]
5656 - ["type parameter default erroneously allowed in invalid location"][36887]
5657 - ["detects super or self keywords at the beginning of global path"][36888]
5658 - ["two overlapping inherent impls define an item with the same name
5659 were erroneously allowed"][36889]
5660 - ["floating-point constants cannot be used in patterns"][36890]
5661 - ["constants of struct or enum type can only be used in a pattern if
5662 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5663 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5664 * [Prohibit patterns in trait methods without bodies][37378]
5665 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5666 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5667 * [The `$crate` macro variable is accepted in fewer locations][37213]
5668 * [Impls specifying extra region requirements beyond the trait
5669 they implement are rejected][37167]
5670 * [Enums may not be unsized][37111]. Unsized enums are intended to
5671 work but never have. For now they are forbidden.
5672 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5674 [tier 2]: https://forge.rust-lang.org/platform-support.html
5675 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5676 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5677 [36430]: https://github.com/rust-lang/rust/pull/36430
5678 [36595]: https://github.com/rust-lang/rust/pull/36595
5679 [36595]: https://github.com/rust-lang/rust/pull/36595
5680 [36692]: https://github.com/rust-lang/rust/pull/36692
5681 [36767]: https://github.com/rust-lang/rust/pull/36767
5682 [36794]: https://github.com/rust-lang/rust/pull/36794
5683 [36798]: https://github.com/rust-lang/rust/pull/36798
5684 [36819]: https://github.com/rust-lang/rust/pull/36819
5685 [36822]: https://github.com/rust-lang/rust/pull/36822
5686 [36825]: https://github.com/rust-lang/rust/pull/36825
5687 [36843]: https://github.com/rust-lang/rust/pull/36843
5688 [36880]: https://github.com/rust-lang/rust/pull/36880
5689 [36886]: https://github.com/rust-lang/rust/issues/36886
5690 [36887]: https://github.com/rust-lang/rust/issues/36887
5691 [36888]: https://github.com/rust-lang/rust/issues/36888
5692 [36889]: https://github.com/rust-lang/rust/issues/36889
5693 [36890]: https://github.com/rust-lang/rust/issues/36890
5694 [36891]: https://github.com/rust-lang/rust/issues/36891
5695 [36892]: https://github.com/rust-lang/rust/issues/36892
5696 [36894]: https://github.com/rust-lang/rust/pull/36894
5697 [36917]: https://github.com/rust-lang/rust/pull/36917
5698 [36993]: https://github.com/rust-lang/rust/pull/36993
5699 [37037]: https://github.com/rust-lang/rust/pull/37037
5700 [37064]: https://github.com/rust-lang/rust/pull/37064
5701 [37094]: https://github.com/rust-lang/rust/pull/37094
5702 [37108]: https://github.com/rust-lang/rust/pull/37108
5703 [37111]: https://github.com/rust-lang/rust/pull/37111
5704 [37161]: https://github.com/rust-lang/rust/pull/37161
5705 [37162]: https://github.com/rust-lang/rust/pull/37162
5706 [37167]: https://github.com/rust-lang/rust/pull/37167
5707 [37178]: https://github.com/rust-lang/rust/pull/37178
5708 [37200]: https://github.com/rust-lang/rust/pull/37200
5709 [37213]: https://github.com/rust-lang/rust/pull/37213
5710 [37221]: https://github.com/rust-lang/rust/pull/37221
5711 [37224]: https://github.com/rust-lang/rust/pull/37224
5712 [37230]: https://github.com/rust-lang/rust/pull/37230
5713 [37231]: https://github.com/rust-lang/rust/pull/37231
5714 [37247]: https://github.com/rust-lang/rust/pull/37247
5715 [37267]: https://github.com/rust-lang/rust/pull/37267
5716 [37270]: https://github.com/rust-lang/rust/pull/37270
5717 [37273]: https://github.com/rust-lang/rust/pull/37273
5718 [37280]: https://github.com/rust-lang/rust/pull/37280
5719 [37298]: https://github.com/rust-lang/rust/pull/37298
5720 [37306]: https://github.com/rust-lang/rust/pull/37306
5721 [37310]: https://github.com/rust-lang/rust/pull/37310
5722 [37312]: https://github.com/rust-lang/rust/pull/37312
5723 [37313]: https://github.com/rust-lang/rust/pull/37313
5724 [37315]: https://github.com/rust-lang/rust/pull/37315
5725 [37318]: https://github.com/rust-lang/rust/pull/37318
5726 [37322]: https://github.com/rust-lang/rust/pull/37322
5727 [37326]: https://github.com/rust-lang/rust/pull/37326
5728 [37351]: https://github.com/rust-lang/rust/pull/37351
5729 [37356]: https://github.com/rust-lang/rust/pull/37356
5730 [37367]: https://github.com/rust-lang/rust/pull/37367
5731 [37373]: https://github.com/rust-lang/rust/pull/37373
5732 [37378]: https://github.com/rust-lang/rust/pull/37378
5733 [37389]: https://github.com/rust-lang/rust/pull/37389
5734 [37392]: https://github.com/rust-lang/rust/pull/37392
5735 [37427]: https://github.com/rust-lang/rust/pull/37427
5736 [37439]: https://github.com/rust-lang/rust/pull/37439
5737 [37445]: https://github.com/rust-lang/rust/pull/37445
5738 [37470]: https://github.com/rust-lang/rust/pull/37470
5739 [37569]: https://github.com/rust-lang/rust/pull/37569
5740 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5741 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5742 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5743 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5744 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5745 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5746 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5749 Version 1.13.0 (2016-11-10)
5750 ===========================
5755 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5756 errors, like the `try!` macro, described in [RFC 0243].
5757 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5758 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5759 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5760 * [Fix lifetime rules for 'if' conditions][36029]
5761 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5766 * [Add the `-C link-arg` argument][36574]
5767 * [Remove the old AST-based backend from rustc_trans][35764]
5768 * [Don't enable NEON by default on armv7 Linux][35814]
5769 * [Fix debug line number info for macro expansions][35238]
5770 * [Do not emit "class method" debuginfo for types that are not
5771 DICompositeType][36008]
5772 * [Warn about multiple conflicting #[repr] hints][34623]
5773 * [When sizing DST, don't double-count nested struct prefixes][36351]
5774 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5775 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5776 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5777 * [Expand macros without recursing to avoid stack overflows][36214]
5782 * [Replace macro backtraces with labeled local uses][35702]
5783 * [Improve error message for misplaced doc comments][33922]
5784 * [Buffer unix and lock windows to prevent message interleaving][35975]
5785 * [Update lifetime errors to specifically note temporaries][36171]
5786 * [Special case a few colors for Windows][36178]
5787 * [Suggest `use self` when such an import resolves][36289]
5788 * [Be more specific when type parameter shadows primitive type][36338]
5789 * Many minor improvements
5791 Compile-time Optimizations
5792 --------------------------
5794 * [Compute and cache HIR hashes at beginning][35854]
5795 * [Don't hash types in loan paths][36004]
5796 * [Cache projections in trans][35761]
5797 * [Optimize the parser's last token handling][36527]
5798 * [Only instantiate #[inline] functions in codegen units referencing
5799 them][36524]. This leads to big improvements in cases where crates export
5800 define many inline functions without using them directly.
5801 * [Lazily allocate TypedArena's first chunk][36592]
5802 * [Don't allocate during default HashSet creation][36734]
5809 * [`overflowing_abs`]
5810 * [`RefCell::try_borrow`]
5811 * [`RefCell::try_borrow_mut`]
5816 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5817 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5819 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5820 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5821 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5822 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5823 * [Use arc4rand on FreeBSD][35884]
5824 * [memrchr: Correct aligned offset computation][35969]
5825 * [Improve Demangling of Rust Symbols][36059]
5826 * [Use monotonic time in condition variables][35048]
5827 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5828 * [Implement conversion traits for `char`][35755]
5829 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5830 * [Zero first byte of CString on drop][36264]
5831 * [Inherit overflow checks for sum and product][36372]
5832 * [Add missing Eq implementations][36423]
5833 * [Implement `Debug` for `DirEntry`][36631]
5834 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5836 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5837 * [Implement more traits for `std::io::ErrorKind`][35911]
5838 * [Optimize BinaryHeap bounds checking][36072]
5839 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5840 `extend_with_element`][36355]
5841 * [Fix overflow checking in unsigned pow()][34942]
5846 * This release includes security fixes to both curl and OpenSSL.
5847 * [Fix transitive doctests when panic=abort][cargo/3021]
5848 * [Add --all-features flag to cargo][cargo/3038]
5849 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5850 * [Don't parse the home directory more than once][cargo/3078]
5851 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5852 * [Update OpenSSL to 1.0.2j][cargo/3121]
5853 * [Add license and license_file to cargo metadata output][cargo/3110]
5854 * [Make crates-io registry URL optional in config; ignore all changes to
5855 source.crates-io][cargo/3089]
5856 * [Don't download dependencies from other platforms][cargo/3123]
5857 * [Build transitive dev-dependencies when needed][cargo/3125]
5858 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5859 * [Avoid updating registry when adding existing deps][cargo/3144]
5860 * [Warn about path overrides that won't work][cargo/3136]
5861 * [Use workspaces during `cargo install`][cargo/3146]
5862 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5863 * [Add --message-format flag][cargo/3000]
5864 * [Pass target environment for rustdoc][cargo/3205]
5865 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5866 * [Update curl and curl-sys][cargo/3241]
5867 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5872 * [rustdoc: Add the `--sysroot` argument][36586]
5873 * [rustdoc: Fix a couple of issues with the search results][35655]
5874 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5875 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5876 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5881 * [Remove unmaintained style guide][35124]
5882 * [Add s390x support][36369]
5883 * [Initial work at Haiku OS support][36727]
5884 * [Add mips-uclibc targets][35734]
5885 * [Crate-ify compiler-rt into compiler-builtins][35021]
5886 * [Add rustc version info (git hash + date) to dist tarball][36213]
5887 * Many documentation improvements
5892 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5893 * [Deny (by default) transmuting from fn item types to pointer-sized
5894 types][34923]. Continuing the long transition to zero-sized fn items,
5896 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5898 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5899 * [Fix lifetime rules for 'if' conditions][36029].
5900 * [Inherit overflow checks for sum and product][36372].
5901 * [Forbid user-defined macros named "macro_rules"][36730].
5903 [33922]: https://github.com/rust-lang/rust/pull/33922
5904 [34623]: https://github.com/rust-lang/rust/pull/34623
5905 [34923]: https://github.com/rust-lang/rust/pull/34923
5906 [34942]: https://github.com/rust-lang/rust/pull/34942
5907 [34982]: https://github.com/rust-lang/rust/pull/34982
5908 [35021]: https://github.com/rust-lang/rust/pull/35021
5909 [35048]: https://github.com/rust-lang/rust/pull/35048
5910 [35074]: https://github.com/rust-lang/rust/pull/35074
5911 [35124]: https://github.com/rust-lang/rust/pull/35124
5912 [35234]: https://github.com/rust-lang/rust/pull/35234
5913 [35238]: https://github.com/rust-lang/rust/pull/35238
5914 [35354]: https://github.com/rust-lang/rust/pull/35354
5915 [35559]: https://github.com/rust-lang/rust/pull/35559
5916 [35585]: https://github.com/rust-lang/rust/pull/35585
5917 [35627]: https://github.com/rust-lang/rust/pull/35627
5918 [35655]: https://github.com/rust-lang/rust/pull/35655
5919 [35702]: https://github.com/rust-lang/rust/pull/35702
5920 [35707]: https://github.com/rust-lang/rust/pull/35707
5921 [35728]: https://github.com/rust-lang/rust/pull/35728
5922 [35734]: https://github.com/rust-lang/rust/pull/35734
5923 [35755]: https://github.com/rust-lang/rust/pull/35755
5924 [35761]: https://github.com/rust-lang/rust/pull/35761
5925 [35764]: https://github.com/rust-lang/rust/pull/35764
5926 [35814]: https://github.com/rust-lang/rust/pull/35814
5927 [35854]: https://github.com/rust-lang/rust/pull/35854
5928 [35871]: https://github.com/rust-lang/rust/pull/35871
5929 [35884]: https://github.com/rust-lang/rust/pull/35884
5930 [35911]: https://github.com/rust-lang/rust/pull/35911
5931 [35969]: https://github.com/rust-lang/rust/pull/35969
5932 [35975]: https://github.com/rust-lang/rust/pull/35975
5933 [36004]: https://github.com/rust-lang/rust/pull/36004
5934 [36008]: https://github.com/rust-lang/rust/pull/36008
5935 [36014]: https://github.com/rust-lang/rust/pull/36014
5936 [36029]: https://github.com/rust-lang/rust/pull/36029
5937 [36059]: https://github.com/rust-lang/rust/pull/36059
5938 [36072]: https://github.com/rust-lang/rust/pull/36072
5939 [36101]: https://github.com/rust-lang/rust/pull/36101
5940 [36104]: https://github.com/rust-lang/rust/pull/36104
5941 [36171]: https://github.com/rust-lang/rust/pull/36171
5942 [36173]: https://github.com/rust-lang/rust/pull/36173
5943 [36178]: https://github.com/rust-lang/rust/pull/36178
5944 [36213]: https://github.com/rust-lang/rust/pull/36213
5945 [36214]: https://github.com/rust-lang/rust/pull/36214
5946 [36264]: https://github.com/rust-lang/rust/pull/36264
5947 [36266]: https://github.com/rust-lang/rust/pull/36266
5948 [36289]: https://github.com/rust-lang/rust/pull/36289
5949 [36338]: https://github.com/rust-lang/rust/pull/36338
5950 [36351]: https://github.com/rust-lang/rust/pull/36351
5951 [36355]: https://github.com/rust-lang/rust/pull/36355
5952 [36369]: https://github.com/rust-lang/rust/pull/36369
5953 [36372]: https://github.com/rust-lang/rust/pull/36372
5954 [36423]: https://github.com/rust-lang/rust/pull/36423
5955 [36482]: https://github.com/rust-lang/rust/pull/36482
5956 [36505]: https://github.com/rust-lang/rust/pull/36505
5957 [36524]: https://github.com/rust-lang/rust/pull/36524
5958 [36527]: https://github.com/rust-lang/rust/pull/36527
5959 [36551]: https://github.com/rust-lang/rust/pull/36551
5960 [36574]: https://github.com/rust-lang/rust/pull/36574
5961 [36586]: https://github.com/rust-lang/rust/pull/36586
5962 [36592]: https://github.com/rust-lang/rust/pull/36592
5963 [36631]: https://github.com/rust-lang/rust/pull/36631
5964 [36639]: https://github.com/rust-lang/rust/pull/36639
5965 [36721]: https://github.com/rust-lang/rust/pull/36721
5966 [36727]: https://github.com/rust-lang/rust/pull/36727
5967 [36730]: https://github.com/rust-lang/rust/pull/36730
5968 [36734]: https://github.com/rust-lang/rust/pull/36734
5969 [36754]: https://github.com/rust-lang/rust/pull/36754
5970 [36995]: https://github.com/rust-lang/rust/pull/36995
5971 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5972 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5973 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5974 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5975 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5976 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5977 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5978 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5979 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5980 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5981 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5982 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5983 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5984 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5985 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5986 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5987 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5988 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5989 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5990 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5991 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5992 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5993 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5994 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5995 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5996 [rustup]: https://www.rustup.rs
5997 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5998 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5999 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6000 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
6001 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
6002 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
6003 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
6006 Version 1.12.1 (2016-10-20)
6007 ===========================
6012 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
6013 * [Confusion with double negation and booleans][36856]
6014 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
6015 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
6016 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
6017 * [Corrupted memory after updated to 1.12][36936]
6018 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
6019 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
6020 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
6022 [36381]: https://github.com/rust-lang/rust/issues/36381
6023 [36856]: https://github.com/rust-lang/rust/issues/36856
6024 [36875]: https://github.com/rust-lang/rust/issues/36875
6025 [36924]: https://github.com/rust-lang/rust/issues/36924
6026 [36926]: https://github.com/rust-lang/rust/issues/36926
6027 [36936]: https://github.com/rust-lang/rust/issues/36936
6028 [37026]: https://github.com/rust-lang/rust/issues/37026
6029 [37112]: https://github.com/rust-lang/rust/issues/37112
6030 [37153]: https://github.com/rust-lang/rust/issues/37153
6033 Version 1.12.0 (2016-09-29)
6034 ===========================
6039 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6040 This translation pass is far simpler than the previous AST->LLVM pass, and
6041 creates opportunities to perform new optimizations directly on the MIR. It
6042 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6043 * [`rustc` presents a new, more readable error format, along with
6044 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6045 Most common editors supporting Rust have been updated to work with it. It was
6046 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6051 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6052 This translation pass is far simpler than the previous AST->LLVM pass, and
6053 creates opportunities to perform new optimizations directly on the MIR. It
6054 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6055 * [Print the Rust target name, not the LLVM target name, with
6056 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6057 * [The computation of `TypeId` is correct in some cases where it was previously
6058 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6059 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6060 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6061 `--print relocation-models`, and `--print code-models` print the available
6062 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6063 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6064 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6065 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6066 These targets produce statically-linked binaries. There are no binary release
6072 * [`rustc` presents a new, more readable error format, along with
6073 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6074 Most common editors supporting Rust have been updated to work with it. It was
6075 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6076 * [In error descriptions, references are now described in plain English,
6077 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6078 * [In error type descriptions, unknown numeric types are named `{integer}` or
6079 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6080 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6085 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6086 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6087 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6088 useful](https://github.com/rust-lang/rust/pull/34908)
6089 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6090 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6091 * [Semicolons are properly required as statement delimiters inside
6092 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6093 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6098 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6099 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6100 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6101 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6102 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6103 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6104 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6105 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6106 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6107 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6108 Both on Unix and Windows.
6109 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6110 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6111 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6112 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6113 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6114 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6115 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6116 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6121 * [The `format!` macro and friends now allow a single argument to be formatted
6122 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6123 * [The lifetime bounds on `[T]::binary_search_by` and
6124 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6125 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6126 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6127 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6128 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6129 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6130 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6131 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6132 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6133 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6134 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6135 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6136 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6137 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6138 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6139 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6140 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6141 * [`mpsc::sync_channel` `Receiver`s return any available message before
6142 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6143 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6144 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6149 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6150 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6151 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6152 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6153 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6154 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6155 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6156 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6157 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6158 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6159 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6160 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6161 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6162 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6163 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6164 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6169 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6170 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6175 * [Test binaries now support a `--test-threads` argument to specify the number
6176 of threads used to run tests, and which acts the same as the
6177 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6178 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6179 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6180 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6181 * [Rust releases now come with source packages that can be installed by rustup
6182 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6183 The resulting source code can be used by tools and IDES, located in the
6184 sysroot under `lib/rustlib/src`.
6189 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6190 * Many minor improvements to the documentation.
6191 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6196 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6197 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6198 * [When formatting strings, if "precision" is specified, the "fill",
6199 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6200 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6203 Version 1.11.0 (2016-08-18)
6204 ===========================
6209 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6210 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6211 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6212 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6217 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6218 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6219 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6220 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6221 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6222 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6223 (in libcore - previously stabilized in libstd)
6224 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6225 (in libcore - previously stabilized in libstd)
6226 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6227 (in libcore - previously stabilized in libstd)
6228 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6229 (in libcore - previously stabilized in libstd)
6230 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6231 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6232 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6233 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6238 * [The `thread_local!` macro supports multiple definitions in a single
6239 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6240 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6241 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6242 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6243 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6244 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6245 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6246 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6251 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6252 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6253 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6254 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6255 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6256 and `-vv` prints warnings for all crates.
6257 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6258 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6259 This provides room for expansion by arbitrary tools.
6260 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6261 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6262 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6263 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6264 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6265 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6266 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6271 * [Caching projections speeds up type check dramatically for some
6272 workloads](https://github.com/rust-lang/rust/pull/33816)
6273 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6274 This hasher is faster, but is believed to provide sufficient
6275 protection from collision attacks.
6276 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6281 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6282 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6283 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6284 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6285 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6290 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6291 * [When emitting debug info, rustc emits frame pointers for closures,
6292 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6293 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6294 * Many more errors have been given error codes and extended
6296 * API documentation continues to be improved, with many new examples
6301 * [rustc no longer hangs when dependencies recursively re-export
6302 submodules](https://github.com/rust-lang/rust/pull/34542)
6303 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6304 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6305 rewritten](https://github.com/rust-lang/rust/pull/33895)
6306 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6307 No targets use this yet, but it works toward AVR support.
6312 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6313 * [The new follow-set rules that place restrictions on `macro_rules!`
6314 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6315 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6316 and has been a warning since 1.10.
6317 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6318 This causes breakage in some corner cases.
6321 Version 1.10.0 (2016-07-07)
6322 ===========================
6327 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6328 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6329 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6330 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6331 * [`panic!` can be converted to a runtime abort with the
6332 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6333 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6334 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6335 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6336 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6337 Note that Cargo does not yet directly support cdylibs.
6342 * `os::windows::fs::OpenOptionsExt::access_mode`
6343 * `os::windows::fs::OpenOptionsExt::share_mode`
6344 * `os::windows::fs::OpenOptionsExt::custom_flags`
6345 * `os::windows::fs::OpenOptionsExt::attributes`
6346 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6347 * `os::unix::fs::OpenOptionsExt::custom_flags`
6348 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6349 * `Default for sync::Weak`
6350 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6351 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6352 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6353 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6354 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6355 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6356 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6357 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6358 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6359 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6360 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6361 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6362 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6363 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6364 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6365 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6366 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6367 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6368 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6369 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6370 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6371 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6372 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6373 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6374 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6375 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6376 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6377 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6378 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6379 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6380 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6381 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6382 * Read/Write/RawFd impls for `UnixStream`
6383 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6384 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6385 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6386 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6387 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6388 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6389 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6390 * RawFd impls for `UnixListener`
6391 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6392 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6393 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6394 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6395 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6396 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6397 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6398 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6399 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6400 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6401 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6402 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6403 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6404 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6405 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6406 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6407 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6408 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6409 * RawFd impls for `UnixDatagram`
6410 * `{BTree,Hash}Map::values_mut`
6411 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6416 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6417 The semantics of this minor method are subtle and probably not what
6419 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6420 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6421 will fall back to `/dev/urandom` temporarily to avoid blocking
6422 during early boot](https://github.com/rust-lang/rust/pull/33086).
6423 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6424 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6425 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6426 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6427 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6428 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6429 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6433 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6434 This controls the runtime behavior of the `panic!` macro
6435 and can be either "unwind" (the default), or "abort".
6436 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6437 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6438 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6439 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6440 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6441 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6442 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6443 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6444 By default they are retried twice, which can be customized with the
6445 `net.retry` value in `.cargo/config`.
6446 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6447 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6448 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6449 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6450 Makes it possible to install multiple crates in parallel.
6451 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6452 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6453 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6454 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6455 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6456 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6461 * [rustc memory usage was reduced by refactoring the context used for
6462 type checking](https://github.com/rust-lang/rust/pull/33425).
6463 * [Speed up creation of `HashMap`s by caching the random keys used
6464 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6465 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6466 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6467 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6468 10x faster than the previous lookup tables.
6469 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6474 * Many incremental improvements to documentation and rustdoc.
6475 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6476 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6477 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6478 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6479 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6480 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6481 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6486 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6487 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6488 * [`std` no longer prints backtraces on platforms where the running
6489 module must be loaded with `env::current_exe`, which can't be relied
6490 on](https://github.com/rust-lang/rust/pull/33554).
6491 * This release includes std binaries for the i586-unknown-linux-gnu,
6492 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6493 i586 target is for old x86 hardware without SSE2, and the armv7
6494 target is for Android running on modern ARM architectures.
6495 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6496 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6497 * [On Unix the runtime aborts by calling `libc::abort` instead of
6498 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6499 * [Rust is now bootstrapped from the previous release of Rust,
6500 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6505 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6506 * [`target_env` for Linux ARM targets is just `gnu`, not
6507 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6508 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6509 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6510 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6511 Affects how macros are parsed.
6512 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6513 * [Feature-gated attributes on macro-generated macro invocations are
6514 now rejected](https://github.com/rust-lang/rust/pull/32791).
6515 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6516 This caused some minor changes to type inference.
6519 Version 1.9.0 (2016-05-26)
6520 ==========================
6525 * The `#[deprecated]` attribute when applied to an API will generate
6526 warnings when used. The warnings may be suppressed with
6527 `#[allow(deprecated)]`. [RFC 1270].
6528 * [`fn` item types are zero sized, and each `fn` names a unique
6529 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6530 `transmute` on a `fn` type will generate a warning for a few cycles,
6531 then will be converted to an error.
6532 * [Field and method resolution understand visibility, so private
6533 fields and methods cannot prevent the proper use of public fields
6534 and methods][1.9fv].
6535 * [The parser considers unicode codepoints in the
6536 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6542 * [`std::panic::catch_unwind`] (renamed from `recover`)
6543 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6544 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6545 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6546 * [`str::is_char_boundary`]
6547 * [`<*const T>::as_ref`]
6548 * [`<*mut T>::as_ref`]
6549 * [`<*mut T>::as_mut`]
6550 * [`AsciiExt::make_ascii_uppercase`]
6551 * [`AsciiExt::make_ascii_lowercase`]
6552 * [`char::decode_utf16`]
6553 * [`char::DecodeUtf16`]
6554 * [`char::DecodeUtf16Error`]
6555 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6556 * [`BTreeSet::take`]
6557 * [`BTreeSet::replace`]
6560 * [`HashSet::replace`]
6562 * [`OsString::with_capacity`]
6563 * [`OsString::clear`]
6564 * [`OsString::capacity`]
6565 * [`OsString::reserve`]
6566 * [`OsString::reserve_exact`]
6567 * [`OsStr::is_empty`]
6569 * [`std::os::unix::thread`]
6572 * [`JoinHandleExt::as_pthread_t`]
6573 * [`JoinHandleExt::into_pthread_t`]
6574 * [`HashSet::hasher`]
6575 * [`HashMap::hasher`]
6576 * [`CommandExt::exec`]
6577 * [`File::try_clone`]
6578 * [`SocketAddr::set_ip`]
6579 * [`SocketAddr::set_port`]
6580 * [`SocketAddrV4::set_ip`]
6581 * [`SocketAddrV4::set_port`]
6582 * [`SocketAddrV6::set_ip`]
6583 * [`SocketAddrV6::set_port`]
6584 * [`SocketAddrV6::set_flowinfo`]
6585 * [`SocketAddrV6::set_scope_id`]
6586 * [`slice::copy_from_slice`]
6587 * [`ptr::read_volatile`]
6588 * [`ptr::write_volatile`]
6589 * [`OpenOptions::create_new`]
6590 * [`TcpStream::set_nodelay`]
6591 * [`TcpStream::nodelay`]
6592 * [`TcpStream::set_ttl`]
6593 * [`TcpStream::ttl`]
6594 * [`TcpStream::set_only_v6`]
6595 * [`TcpStream::only_v6`]
6596 * [`TcpStream::take_error`]
6597 * [`TcpStream::set_nonblocking`]
6598 * [`TcpListener::set_ttl`]
6599 * [`TcpListener::ttl`]
6600 * [`TcpListener::set_only_v6`]
6601 * [`TcpListener::only_v6`]
6602 * [`TcpListener::take_error`]
6603 * [`TcpListener::set_nonblocking`]
6604 * [`UdpSocket::set_broadcast`]
6605 * [`UdpSocket::broadcast`]
6606 * [`UdpSocket::set_multicast_loop_v4`]
6607 * [`UdpSocket::multicast_loop_v4`]
6608 * [`UdpSocket::set_multicast_ttl_v4`]
6609 * [`UdpSocket::multicast_ttl_v4`]
6610 * [`UdpSocket::set_multicast_loop_v6`]
6611 * [`UdpSocket::multicast_loop_v6`]
6612 * [`UdpSocket::set_multicast_ttl_v6`]
6613 * [`UdpSocket::multicast_ttl_v6`]
6614 * [`UdpSocket::set_ttl`]
6615 * [`UdpSocket::ttl`]
6616 * [`UdpSocket::set_only_v6`]
6617 * [`UdpSocket::only_v6`]
6618 * [`UdpSocket::join_multicast_v4`]
6619 * [`UdpSocket::join_multicast_v6`]
6620 * [`UdpSocket::leave_multicast_v4`]
6621 * [`UdpSocket::leave_multicast_v6`]
6622 * [`UdpSocket::take_error`]
6623 * [`UdpSocket::connect`]
6624 * [`UdpSocket::send`]
6625 * [`UdpSocket::recv`]
6626 * [`UdpSocket::set_nonblocking`]
6631 * [`std::sync::Once` is poisoned if its initialization function
6633 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6634 * [Most types implement `fmt::Debug`][1.9db].
6635 * [The default buffer size used by `BufReader` and `BufWriter` was
6636 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6637 used by other languages.
6638 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6639 `Duration` additionally implements `*=` and `/=`][1.9ta].
6640 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6641 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6642 * [`Chain` implements `BufRead`][1.9ch].
6643 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6648 * [Cargo can now run concurrently][1.9cc].
6649 * [Top-level overrides allow specific revisions of crates to be
6650 overridden through the entire crate graph][1.9ct]. This is intended
6651 to make upgrades easier for large projects, by allowing crates to be
6652 forked temporarily until they've been upgraded and republished.
6653 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6654 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6655 on the commandline][1.9cf]. `rustc` arguments can also be specified
6656 in the `build.rustflags` configuration key.
6661 * [The time complexity of comparing variables for equivalence during type
6662 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6663 to major compilation time improvement in some scenarios.
6664 * [`ToString` is specialized for `str`, giving it the same performance
6665 as `to_owned`][1.9ts].
6666 * [Spawning processes with `Command::output` no longer creates extra
6668 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6669 for C-like enums][1.9cl].
6674 * [Passing the `--quiet` flag to a test runner will produce
6675 much-abbreviated output][1.9q].
6676 * The Rust Project now publishes std binaries for the
6677 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6678 `i586-pc-windows-msvc` targets.
6683 * [`std::sync::Once` is poisoned if its initialization function
6685 * [It is illegal to define methods with the same name in overlapping
6686 inherent `impl` blocks][1.9sn].
6687 * [`fn` item types are zero sized, and each `fn` names a unique
6688 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6689 `transmute` on a `fn` type will generate a warning for a few cycles,
6690 then will be converted to an error.
6691 * [Improvements to const evaluation may trigger new errors when integer
6692 literals are out of range][1.9ce].
6695 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6696 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6697 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6698 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6699 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6700 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6701 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6702 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6703 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6704 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6705 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6706 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6707 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6708 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6709 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6710 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6711 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6712 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6713 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6714 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6715 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6716 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6717 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6718 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6719 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6720 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6721 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6722 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6723 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6724 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6725 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6726 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6727 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6728 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6729 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6730 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6731 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6732 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6733 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6734 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6735 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6736 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6737 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6738 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6739 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6740 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6741 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6742 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6743 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6744 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6745 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6746 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6747 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6748 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6749 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6750 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6751 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6752 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6753 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6754 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6755 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6756 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6757 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6758 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6759 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6760 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6761 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6762 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6763 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6764 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6765 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6766 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6767 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6768 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6769 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6770 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6771 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6772 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6773 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6774 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6775 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6776 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6777 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6778 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6779 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6780 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6781 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6782 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6783 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6784 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6785 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6786 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6787 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6788 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6789 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6790 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6791 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6792 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6793 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6794 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6795 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6796 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6797 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6798 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6799 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6800 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6801 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6802 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6803 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6804 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6807 Version 1.8.0 (2016-04-14)
6808 ==========================
6813 * Rust supports overloading of compound assignment statements like
6814 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6815 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6816 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6818 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6819 addition to the non-braced form, `struct Foo;`. [RFC 218].
6825 * [`str::encode_utf16`] (renamed from `utf16_units`)
6826 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6829 * [`ptr::drop_in_place`]
6831 * [`time::SystemTime`]
6833 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6834 * [`Instant::elapsed`]
6835 * [`SystemTime::now`]
6836 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6837 * [`SystemTime::elapsed`]
6838 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6839 * [`SystemTimeError`]
6840 * [`SystemTimeError::duration`]
6841 * Various impls for `SystemTimeError`
6843 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6844 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6845 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6846 * [The `write!` and `writeln!` macros correctly emit errors if any of
6847 their arguments can't be formatted][1.8w].
6848 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6849 * [The Unix-specific `raw` modules, which contain a number of
6850 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6851 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6852 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6853 across platforms was making it difficult to implement `std`
6854 correctly. Those that need these definitions should use the `libc`
6856 * The Unix-specific `MetadataExt` traits, including
6857 `os::unix::fs::MetadataExt`, which expose values such as inode
6858 numbers [no longer return platform-specific types][1.8r], but
6859 instead return widened integers. [RFC 1415].
6860 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6861 * [Atomic loads and stores are not volatile][1.8a].
6862 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6867 * [Inlining hash functions lead to a 3% compile-time improvement in
6868 some workloads][1.8h].
6869 * When using jemalloc, its symbols are [unprefixed so that it
6870 overrides the libc malloc implementation][1.8h]. This means that for
6871 rustc, LLVM is now using jemalloc, which results in a 6%
6872 compile-time improvement on a specific workload.
6873 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6878 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6879 i686-pc-windows-msvc is now considered a tier-1 platform.
6880 * [The `--print targets` flag prints a list of supported targets][1.8t].
6881 * [The `--print cfg` flag prints the `cfg`s defined for the current
6883 * [`rustc` can be built with an new Cargo-based build system, written
6884 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6885 build system. To enable it configure with `configure --rustbuild`.
6886 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6887 variants while also indicating the total number of missing variants
6888 if more than 3][1.8m].
6889 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6890 * The Rust Project now publishes binary releases of the standard
6891 library for a number of tier-2 targets:
6892 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6893 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6894 `x86_64-rumprun-netbsd`. These can be installed with
6895 tools such as [multirust][1.8mr].
6900 * [`cargo init` creates a new Cargo project in the current
6901 directory][1.8ci]. It is otherwise like `cargo new`.
6902 * [Cargo has configuration keys for `-v` and
6903 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6904 `[term]` section of `.cargo/config`.
6905 * [Configuration keys that evaluate to strings or integers can be set
6906 via environment variables][1.8ce]. For example the `build.jobs` key
6907 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6908 precedence over config files.
6909 * [Target-specific dependencies support Rust `cfg` syntax for
6910 describing targets][1.8cfg] so that dependencies for multiple
6911 targets can be specified together. [RFC 1361].
6912 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6913 `RUSTDOC` take precedence over the `build.target-dir`,
6914 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6915 * [The child process tree is killed on Windows when Cargo is
6917 * [The `build.target` configuration value sets the target platform,
6918 like `--target`][1.8ct].
6923 * [Unstable compiler flags have been further restricted][1.8u]. Since
6924 1.0 `-Z` flags have been considered unstable, and other flags that
6925 were considered unstable additionally required passing `-Z
6926 unstable-options` to access. Unlike unstable language and library
6927 features though, these options have been accessible on the stable
6928 release channel. Going forward, *new unstable flags will not be
6929 available on the stable release channel*, and old unstable flags
6930 will warn about their usage. In the future, all unstable flags will
6931 be unavailable on the stable release channel.
6932 * [It is no longer possible to `match` on empty enum variants using
6933 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6934 * The Unix-specific `MetadataExt` traits, including
6935 `os::unix::fs::MetadataExt`, which expose values such as inode
6936 numbers [no longer return platform-specific types][1.8r], but
6937 instead return widened integers. [RFC 1415].
6938 * [Modules sourced from the filesystem cannot appear within arbitrary
6939 blocks, but only within other modules][1.8mf].
6940 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6941 * On Unix, [stack overflow triggers a runtime abort instead of a
6943 * [`Command::spawn` and its equivalents return an error if any of
6944 its command-line arguments contain interior `NUL`s][1.8n].
6945 * [Tuple and unit enum variants from other crates are in the type
6947 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6948 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6949 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6950 instead of `foo.lib`.
6953 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6954 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6955 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6956 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6957 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6958 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6959 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6960 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6961 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6962 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6963 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6964 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6965 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6966 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6967 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6968 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6969 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6970 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6971 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6972 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6973 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6974 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6975 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6976 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6977 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6978 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6979 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6980 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6981 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6982 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6983 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6984 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6985 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6986 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6987 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6988 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6989 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6990 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6991 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6992 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6993 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6994 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6995 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6996 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6997 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6998 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6999 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7000 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
7001 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
7002 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
7003 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
7004 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
7005 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
7006 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
7007 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
7008 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
7009 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
7010 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
7011 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
7012 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
7015 Version 1.7.0 (2016-03-03)
7016 ==========================
7023 * [`Path::strip_prefix`] (renamed from relative_from)
7024 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
7026 * [`Ipv4Addr::is_loopback`]
7027 * [`Ipv4Addr::is_private`]
7028 * [`Ipv4Addr::is_link_local`]
7029 * [`Ipv4Addr::is_multicast`]
7030 * [`Ipv4Addr::is_broadcast`]
7031 * [`Ipv4Addr::is_documentation`]
7033 * [`Ipv6Addr::is_unspecified`]
7034 * [`Ipv6Addr::is_loopback`]
7035 * [`Ipv6Addr::is_multicast`]
7038 * [`Vec::as_mut_slice`]
7040 * [`String::as_str`]
7041 * [`String::as_mut_str`]
7043 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7045 * `<[T]>::`[`sort_by_key`]
7046 * checked, saturated, and overflowing operations
7047 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7048 * [`i32::saturating_mul`]
7049 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7050 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7051 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7052 * [`u32::saturating_mul`]
7053 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7054 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7055 * and checked, saturated, and overflowing operations for other primitive types
7057 * [`ffi::IntoStringError`]
7058 * [`CString::into_string`]
7059 * [`CString::into_bytes`]
7060 * [`CString::into_bytes_with_nul`]
7061 * `From<CString> for Vec<u8>`
7063 * [`IntoStringError::into_cstring`]
7064 * [`IntoStringError::utf8_error`]
7065 * `Error for IntoStringError`
7067 * [`std::hash::BuildHasher`]
7068 * [`BuildHasher::Hasher`]
7069 * [`BuildHasher::build_hasher`]
7070 * [`std::hash::BuildHasherDefault`]
7071 * [`HashMap::with_hasher`]
7072 * [`HashMap::with_capacity_and_hasher`]
7073 * [`HashSet::with_hasher`]
7074 * [`HashSet::with_capacity_and_hasher`]
7075 * [`std::collections::hash_map::RandomState`]
7076 * [`RandomState::new`]
7077 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7078 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7079 from bytes is faster.
7080 * [The performance of `LineWriter` (and thus `io::stdout`) was
7081 improved by using `memchr` to search for newlines][1.7m].
7082 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7083 `f64` variants were stabilized previously.
7084 * [`BTreeMap` was rewritten to use less memory and improve the performance
7085 of insertion and iteration, the latter by as much as 5x][1.7bm].
7086 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7087 covariant over their contained type][1.7bt].
7088 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7089 over their contained type][1.7ll].
7090 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7092 * [`Any` is implemented for unsized types][1.7a].
7093 * [`Hash` is implemented for `Duration`][1.7h].
7098 * [When running tests with `--test`, rustdoc will pass `--cfg`
7099 arguments to the compiler][1.7dt].
7100 * [The compiler is built with RPATH information by default][1.7rpa].
7101 This means that it will be possible to run `rustc` when installed in
7102 unusual configurations without configuring the dynamic linker search
7104 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7105 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7106 over `LD_LIBRARY_PATH`.
7111 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7112 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7113 * [The `rerun-if-changed` build script directive no longer causes the
7114 build script to incorrectly run twice in certain scenarios][1.7rr].
7119 * Soundness fixes to the interactions between associated types and
7120 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7121 code that violates the new rules. This is a significant change that
7122 is known to break existing code, so it has emitted warnings for the
7123 new error cases since 1.4 to give crate authors time to adapt. The
7124 details of what is changing are subtle; read the RFC for more.
7125 * [Several bugs in the compiler's visibility calculations were
7126 fixed][1.7v]. Since this was found to break significant amounts of
7127 code, the new errors will be emitted as warnings for several release
7128 cycles, under the `private_in_public` lint.
7129 * Defaulted type parameters were accidentally accepted in positions
7130 that were not intended. In this release, [defaulted type parameters
7131 appearing outside of type definitions will generate a
7132 warning][1.7d], which will become an error in future releases.
7133 * [Parsing "." as a float results in an error instead of 0][1.7p].
7134 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7135 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7137 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7138 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7139 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7140 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7141 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7142 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7143 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7144 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7145 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7146 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7147 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7148 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7149 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7150 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7151 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7152 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7153 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7154 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7155 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7156 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7157 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7158 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7159 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7160 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7161 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7162 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7163 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7164 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7165 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7166 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7167 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7168 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7169 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7170 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7171 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7172 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7173 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7174 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7175 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7176 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7177 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7178 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7179 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7180 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7181 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7182 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7183 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7184 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7185 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7186 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7187 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7188 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7189 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7190 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7191 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7192 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7193 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7194 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7195 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7196 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7197 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7198 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7199 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7200 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7201 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7202 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7203 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7204 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7205 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7206 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7207 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7208 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7209 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7210 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7211 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7212 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7213 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7214 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7215 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7218 Version 1.6.0 (2016-01-21)
7219 ==========================
7224 * The `#![no_std]` attribute causes a crate to not be linked to the
7225 standard library, but only the [core library][1.6co], as described
7226 in [RFC 1184]. The core library defines common types and traits but
7227 has no platform dependencies whatsoever, and is the basis for Rust
7228 software in environments that cannot support a full port of the
7229 standard library, such as operating systems. Most of the core
7230 library is now stable.
7236 [`Read::read_exact`],
7237 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7238 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7239 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7240 [`os::unix::fs::DirBuilderExt`],
7241 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7242 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7243 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7244 [`collections::hash_map::Drain`],
7245 [`collections::hash_map::HashMap::drain`],
7246 [`collections::hash_set::Drain`],
7247 [`collections::hash_set::HashSet::drain`],
7248 [`collections::binary_heap::Drain`],
7249 [`collections::binary_heap::BinaryHeap::drain`],
7250 [`Vec::extend_from_slice`] (renamed from `push_all`),
7251 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7252 [`RwLock::into_inner`],
7253 [`Iterator::min_by_key`] (renamed from `min_by`),
7254 [`Iterator::max_by_key`] (renamed from `max_by`).
7255 * The [core library][1.6co] is stable, as are most of its APIs.
7256 * [The `assert_eq!` macro supports arguments that don't implement
7257 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7259 * Several timer functions that take duration in milliseconds [are
7260 deprecated in favor of those that take `Duration`][1.6ms]. These
7261 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7262 `thread::park_timeout_ms`.
7263 * The algorithm by which `Vec` reserves additional elements was
7264 [tweaked to not allocate excessive space][1.6a] while still growing
7266 * `From` conversions are [implemented from integers to floats][1.6f]
7267 in cases where the conversion is lossless. Thus they are not
7268 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7269 or `f64`. They are also not implemented for `isize` and `usize`
7270 because the implementations would be platform-specific. `From` is
7271 also implemented from `f32` to `f64`.
7272 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7273 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7274 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7275 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7277 * Sorting slices that are already sorted [is 50% faster in some
7283 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7284 * Cargo build scripts can specify their dependencies by emitting the
7285 [`rerun-if-changed`][1.6rr] key.
7286 * crates.io will reject publication of crates with dependencies that
7287 have a wildcard version constraint. Crates with wildcard
7288 dependencies were seen to cause a variety of problems, as described
7289 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7291 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7292 release folder. A variety of artifacts that Cargo failed to clean
7293 are now correctly deleted.
7298 * The `unreachable_code` lint [warns when a function call's argument
7300 * The parser indicates [failures that may be caused by
7301 confusingly-similar Unicode characters][1.6uc]
7302 * Certain macro errors [are reported at definition time][1.6m], not
7308 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7309 environment variable when locating crates. This was a pre-cargo
7310 feature for integrating with the package manager that was
7311 accidentally never removed.
7312 * [A number of bugs were fixed in the privacy checker][1.6p] that
7313 could cause previously-accepted code to break.
7314 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7315 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7316 struct pattern syntax (`Foo(..)`) can no longer be used to match
7317 unit structs. This is a warning now, but will become an error in
7318 future releases. Patterns that share the same name as a const are
7320 * A bug was fixed that causes [rustc not to apply default type
7321 parameters][1.6xc] when resolving certain method implementations of
7322 traits defined in other crates.
7324 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7325 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7326 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7327 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7328 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7329 [1.6co]: http://doc.rust-lang.org/core/index.html
7330 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7331 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7332 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7333 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7334 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7335 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7336 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7337 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7338 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7339 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7340 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7341 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7342 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7343 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7344 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7345 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7346 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7347 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7348 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7349 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7350 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7351 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7352 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7353 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7354 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7355 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7356 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7357 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7358 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7359 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7360 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7361 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7362 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7363 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7364 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7365 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7366 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7367 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7368 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7369 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7370 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7373 Version 1.5.0 (2015-12-10)
7374 ==========================
7376 * ~700 changes, numerous bugfixes
7382 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7383 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7384 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7385 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7386 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7387 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7388 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7389 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7390 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7391 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7392 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7393 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7394 [`Path::read_link`], [`Path::symlink_metadata`],
7395 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7396 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7397 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7398 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7399 [`slice::split_first_mut`], [`slice::split_first`],
7400 [`slice::split_last_mut`], [`slice::split_last`],
7401 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7402 [`str::MatchIndices`], [`str::RMatchIndices`],
7403 [`str::match_indices`], [`str::rmatch_indices`],
7404 [`str::slice_mut_unchecked`], [`string::ParseError`].
7405 * Rust applications hosted on crates.io can be installed locally to
7406 `~/.cargo/bin` with the [`cargo install`] command. Among other
7407 things this makes it easier to augment Cargo with new subcommands:
7408 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7409 invoked as `cargo foo`.
7410 * Crates with wildcard (`*`) dependencies will [emit warnings when
7411 published][1.5w]. In 1.6 it will no longer be possible to publish
7412 crates with wildcard dependencies.
7417 * The rules determining when a particular lifetime must outlive
7418 a particular value (known as '[dropck]') have been [modified
7419 to not rely on parametricity][1.5p].
7420 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7421 and `Arc`][1.5a]. Because these smart pointer types implement
7422 `Deref`, this causes breakage in cases where the interior type
7423 contains methods of the same name.
7424 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7425 that they could drop their content. Soundness fix.
7426 * All method invocations are [properly checked][1.5wf1] for
7427 [well-formedness][1.5wf2]. Soundness fix.
7428 * Traits whose supertraits contain `Self` are [not object
7429 safe][1.5o]. Soundness fix.
7430 * Target specifications support a [`no_default_libraries`][1.5nd]
7431 setting that controls whether `-nodefaultlibs` is passed to the
7432 linker, and in turn the `is_like_windows` setting no longer affects
7433 the `-nodefaultlibs` flag.
7434 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7435 * The `#[inline]` and `#[repr]` attributes [can only appear
7436 in valid locations][1.5at].
7437 * Native libraries linked from the local crate are [passed to
7438 the linker before native libraries from upstream crates][1.5nl].
7439 * Two rarely-used attributes, `#[no_debug]` and
7440 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7441 * Negation of unsigned integers, which has been a warning for
7442 several releases, [is now behind a feature gate and will
7443 generate errors][1.5nu].
7444 * The parser accidentally accepted visibility modifiers on
7445 enum variants, a bug [which has been fixed][1.5ev].
7446 * [A bug was fixed that allowed `use` statements to import unstable
7452 * When evaluating expressions at compile-time that are not
7453 compile-time constants (const-evaluating expressions in non-const
7454 contexts), incorrect code such as overlong bitshifts and arithmetic
7455 overflow will [generate a warning instead of an error][1.5ce],
7456 delaying the error until runtime. This will allow the
7457 const-evaluator to be expanded in the future backwards-compatibly.
7458 * The `improper_ctypes` lint [no longer warns about using `isize` and
7459 `usize` in FFI][1.5ict].
7464 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7466 * `Default` is [implemented for mutable slices][1.5d].
7467 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7468 * There are now `From` conversions [between floating point
7469 types][1.5f] where the conversions are lossless.
7470 * There are now `From` conversions [between integer types][1.5i] where
7471 the conversions are lossless.
7472 * [`fs::Metadata` implements `Clone`][1.5fs].
7473 * The `parse` method [accepts a leading "+" when parsing
7475 * [`AsMut` is implemented for `Vec`][1.5am].
7476 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7477 been optimized][1.5cf] and no longer rely on the default impl.
7478 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7479 `unsafe extern "C"` function types now [implement `Clone`,
7480 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7481 `fmt::Debug` for up to 12 arguments][1.5fp].
7482 * [Dropping `Vec`s is much faster in unoptimized builds when the
7483 element types don't implement `Drop`][1.5dv].
7484 * A bug that caused in incorrect behavior when [combining `VecDeque`
7485 with zero-sized types][1.5vdz] was resolved.
7486 * [`PartialOrd` for slices is faster][1.5po].
7491 * [Crate metadata size was reduced by 20%][1.5md].
7492 * [Improvements to code generation reduced the size of libcore by 3.3
7493 MB and rustc's memory usage by 18MB][1.5m].
7494 * [Improvements to deref translation increased performance in
7495 unoptimized builds][1.5dr].
7496 * Various errors in trait resolution [are deduplicated to only be
7497 reported once][1.5te].
7498 * Rust has preliminary [support for rumprun kernels][1.5rr].
7499 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7501 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7502 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7503 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7504 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7505 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7506 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7507 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7508 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7509 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7510 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7511 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7512 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7513 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7514 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7515 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7516 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7517 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7518 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7519 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7520 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7521 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7522 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7523 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7524 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7525 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7526 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7527 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7528 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7529 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7530 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7531 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7532 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7533 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7534 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7535 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7536 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7537 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7538 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7539 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7540 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7541 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7542 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7543 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7544 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7545 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7546 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7547 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7548 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7549 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7550 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7551 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7552 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7553 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7554 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7555 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7556 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7557 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7558 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7559 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7560 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7561 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7562 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7563 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7564 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7565 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7566 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7567 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7568 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7569 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7570 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7571 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7572 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7573 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7574 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7575 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7576 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7577 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7578 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7579 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7580 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7581 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7582 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7583 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7584 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7585 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7586 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7587 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7588 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7589 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7591 Version 1.4.0 (2015-10-29)
7592 ==========================
7594 * ~1200 changes, numerous bugfixes
7599 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7600 GNU) are now supported and recommended for use.
7605 * [Several changes have been made to fix type soundness and improve
7606 the behavior of associated types][sound]. See [RFC 1214]. Although
7607 we have mostly introduced these changes as warnings this release, to
7608 become errors next release, there are still some scenarios that will
7609 see immediate breakage.
7610 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7611 line breaks in addition to `\n`][crlf].
7612 * [Loans of `'static` lifetime extend to the end of a function][stat].
7613 * [`str::parse` no longer introduces avoidable rounding error when
7614 parsing floating point numbers. Together with earlier changes to
7615 float formatting/output, "round trips" like f.to_string().parse()
7616 now preserve the value of f exactly. Additionally, leading plus
7617 signs are now accepted][fp3].
7623 * `use` statements that import multiple items [can now rename
7624 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7625 * [Binops work correctly on fat pointers][binfat].
7626 * `pub extern crate`, which does not behave as expected, [issues a
7627 warning][pec] until a better solution is found.
7632 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7633 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7634 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7635 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7636 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7637 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7638 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7639 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7640 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7641 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7642 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7643 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7644 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7645 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7646 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7647 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7648 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7649 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7651 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7652 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7653 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7654 `f64::from_str_radix`.
7655 * [Reverse-searching strings is faster with the 'two-way'
7657 * [`std::io::copy` allows `?Sized` arguments][cc].
7658 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7659 [override `count`, `nth` and `last` with an O(1)
7660 implementation][it].
7661 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7662 * [`IntoRawFd` has been added to the Unix-specific prelude,
7663 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7665 * [`Extend<String>` and `FromIterator<String` are both implemented for
7667 * [`IntoIterator` is implemented for references to `Option` and
7669 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7670 Copy`][ext] as part of [RFC 839]. This will cause type inference
7671 breakage in rare situations.
7672 * [`BinaryHeap` implements `Debug`][bh2].
7673 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7675 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7676 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7677 * [String comparison is faster][faststr].
7678 * `&mut T` where `T: std::fmt::Write` [also implements
7679 `std::fmt::Write`][mutw].
7680 * [A stable regression in `VecDeque::push_back` and other
7681 capacity-altering methods that caused panics for zero-sized types
7683 * [Function pointers implement traits for up to 12 parameters][fp2].
7688 * The compiler [no longer uses the 'morestack' feature to prevent
7689 stack overflow][mm]. Instead it uses guard pages and stack
7690 probes (though stack probes are not yet implemented on any platform
7692 * [The compiler matches traits faster when projections are involved][p].
7693 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7695 * [Cargo now displays useful information about what its doing during
7696 `cargo update`][cu].
7698 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7699 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7700 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7701 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7702 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7703 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7704 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7705 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7706 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7707 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7708 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7709 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7710 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7711 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7712 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7713 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7714 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7715 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7716 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7717 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7718 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7719 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7720 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7721 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7722 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7723 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7724 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7725 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7726 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7727 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7728 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7729 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7730 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7731 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7732 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7733 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7734 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7735 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7736 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7737 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7738 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7739 [bh2]: https://github.com/rust-lang/rust/pull/28156
7740 [binfat]: https://github.com/rust-lang/rust/pull/28270
7741 [bm]: https://github.com/rust-lang/rust/pull/28197
7742 [cc]: https://github.com/rust-lang/rust/pull/27531
7743 [crlf]: https://github.com/rust-lang/rust/pull/28034
7744 [cu]: https://github.com/rust-lang/cargo/pull/1931
7745 [d]: https://github.com/rust-lang/rust/pull/27825
7746 [dep]: https://github.com/rust-lang/rust/pull/28339
7747 [es]: https://github.com/rust-lang/rust/pull/27956
7748 [ext]: https://github.com/rust-lang/rust/pull/28094
7749 [faststr]: https://github.com/rust-lang/rust/pull/28338
7750 [ffi]: https://github.com/rust-lang/rust/pull/28779
7751 [fp]: https://github.com/rust-lang/rust/pull/28268
7752 [fp2]: https://github.com/rust-lang/rust/pull/28560
7753 [fp3]: https://github.com/rust-lang/rust/pull/27307
7754 [i]: https://github.com/rust-lang/rust/pull/27451
7755 [into2]: https://github.com/rust-lang/rust/pull/28039
7756 [it]: https://github.com/rust-lang/rust/pull/27652
7757 [mm]: https://github.com/rust-lang/rust/pull/27338
7758 [mutw]: https://github.com/rust-lang/rust/pull/28368
7759 [sound]: https://github.com/rust-lang/rust/pull/27641
7760 [p]: https://github.com/rust-lang/rust/pull/27866
7761 [pec]: https://github.com/rust-lang/rust/pull/28486
7762 [pr]: https://github.com/rust-lang/rust/pull/27896
7763 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7764 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7765 [s]: https://github.com/rust-lang/rust/pull/27474
7766 [stab]: https://github.com/rust-lang/rust/pull/28339
7767 [stat]: https://github.com/rust-lang/rust/pull/28321
7768 [vd]: https://github.com/rust-lang/rust/pull/28494
7770 Version 1.3.0 (2015-09-17)
7771 ==============================
7773 * ~900 changes, numerous bugfixes
7778 * The [new object lifetime defaults][nold] have been [turned
7779 on][nold2] after a cycle of warnings about the change. Now types
7780 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7781 being interpreted as `&'a Box<Trait+'a>` to `&'a
7782 Box<Trait+'static>`.
7783 * [The Rustonomicon][nom] is a new book in the official documentation
7784 that dives into writing unsafe Rust.
7785 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7786 timekeeping is employed by other std APIs, as well as out-of-tree
7792 * The [new object lifetime defaults][nold] have been [turned
7793 on][nold2] after a cycle of warnings about the change.
7794 * There is a known [regression][lr] in how object lifetime elision is
7795 interpreted, the proper solution for which is undetermined.
7796 * The `#[prelude_import]` attribute, an internal implementation
7797 detail, was accidentally stabilized previously. [It has been put
7798 behind the `prelude_import` feature gate][pi]. This change is
7799 believed to break no existing code.
7800 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7801 [more sane for dynamically sized types][dst3]. Code that relied on
7802 the previous behavior is thought to be broken.
7803 * The `dropck` rules, which checks that destructors can't access
7804 destroyed values, [have been updated][dropck] to match the
7805 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7806 cause some previously-compiling code to no longer build.
7811 * The [new object lifetime defaults][nold] have been [turned
7812 on][nold2] after a cycle of warnings about the change.
7813 * Semicolons may [now follow types and paths in
7814 macros](https://github.com/rust-lang/rust/pull/27000).
7815 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7816 [more sane for dynamically sized types][dst3]. Code that relied on
7817 the previous behavior is not known to exist, and suspected to be
7819 * `'static` variables [may now be recursive][st].
7820 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7821 implementations correctly.
7822 * The `dropck` rules, which checks that destructors can't access
7823 destroyed values, [have been updated][dropck] to match the
7829 * The [`Duration`] API, [has been stabilized][ds], as well as the
7830 `std::time` module, which presently contains only `Duration`.
7831 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7832 * The owned C string, [`CString`], implements [`Borrow`] and the
7833 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7834 these allow C strings to be borrowed and cloned in generic code.
7835 * [`CStr`] implements [`Debug`].
7836 * [`AtomicPtr`] implements [`Debug`].
7837 * [`Error`] trait objects [can be downcast to their concrete types][e]
7838 in many common configurations, using the [`is`], [`downcast`],
7839 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7841 * Searching for substrings now [employs the two-way algorithm][search]
7842 instead of doing a naive search. This gives major speedups to a
7843 number of methods, including [`contains`][sc], [`find`][sf],
7844 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7845 [`ends_with`][sew] are also faster.
7846 * The performance of `PartialEq` for slices is [much faster][ps].
7847 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7848 is overridden and optimized by the implementations for scalars.
7849 * The [`Hasher`] trait now has a number of specialized `write_*`
7850 methods for primitive types, for efficiency.
7851 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7852 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7853 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7854 of [`std::error::Error::cause`][iec] also delegates to the inner
7856 * [`process::Child`][pc] gained the [`id`] method, which returns a
7857 `u32` representing the platform-specific process identifier.
7858 * The [`connect`] method on slices is deprecated, replaced by the new
7859 [`join`] method (note that both of these are on the *unstable*
7860 [`SliceConcatExt`] trait, but through the magic of the prelude are
7861 available to stable code anyway).
7862 * The [`Div`] operator is implemented for [`Wrapping`] types.
7863 * [`DerefMut` is implemented for `String`][dms].
7864 * Performance of SipHash (the default hasher for `HashMap`) is
7865 [better for long data][sh].
7866 * [`AtomicPtr`] implements [`Send`].
7867 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7868 are now [specialized to use uninitialized buffers for increased
7870 * Lifetime parameters of foreign functions [are now resolved
7876 * Rust can now, with some coercion, [produce programs that run on
7877 Windows XP][xp], though XP is not considered a supported platform.
7878 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7879 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7880 recommended for use in 1.3, though should be fully-functional
7881 in the [64-bit 1.4 beta][b14].
7882 * On Fedora-based systems installation will [properly configure the
7883 dynamic linker][fl].
7884 * The compiler gained many new extended error descriptions, which can
7885 be accessed with the `--explain` flag.
7886 * The `dropck` pass, which checks that destructors can't access
7887 destroyed values, [has been rewritten][dropck]. This fixes some
7888 soundness holes, and as such will cause some previously-compiling
7889 code to no longer build.
7890 * `rustc` now uses [LLVM to write archive files where possible][ar].
7891 Eventually this will eliminate the compiler's dependency on the ar
7893 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7894 supported FreeBSD on x86_64).
7895 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7896 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7898 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7899 will kill the process instead of leaking][nlp].
7901 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7902 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7903 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7904 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7905 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7906 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7907 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7908 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7909 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7910 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7911 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7912 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7913 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7914 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7915 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7916 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7917 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7918 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7919 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7920 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7921 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7922 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7923 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7924 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7925 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7926 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7927 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7928 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7929 [ar]: https://github.com/rust-lang/rust/pull/26926
7930 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7931 [dms]: https://github.com/rust-lang/rust/pull/26241
7932 [dropck]: https://github.com/rust-lang/rust/pull/27261
7933 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7934 [ds]: https://github.com/rust-lang/rust/pull/26818
7935 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7936 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7937 [dst3]: https://github.com/rust-lang/rust/pull/27351
7938 [e]: https://github.com/rust-lang/rust/pull/24793
7939 [f]: https://github.com/rust-lang/rust/pull/26588
7940 [fb]: https://github.com/rust-lang/rust/pull/26959
7941 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7942 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7943 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7944 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7945 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7946 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7947 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7948 [lic]: https://github.com/rust-lang/rust/pull/26583
7949 [lnu]: https://github.com/rust-lang/rust/pull/27026
7950 [lr]: https://github.com/rust-lang/rust/issues/27248
7951 [lum]: https://github.com/rust-lang/rust/pull/26378
7952 [lur]: https://github.com/rust-lang/rust/pull/26783
7953 [nlp]: https://github.com/rust-lang/rust/pull/27176
7954 [nold2]: https://github.com/rust-lang/rust/pull/27045
7955 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7956 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7957 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7958 [pi]: https://github.com/rust-lang/rust/pull/26699
7959 [ps]: https://github.com/rust-lang/rust/pull/26884
7960 [rte]: https://github.com/rust-lang/rust/pull/26950
7961 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7962 [search]: https://github.com/rust-lang/rust/pull/26327
7963 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7964 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7965 [sh]: https://github.com/rust-lang/rust/pull/27280
7966 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7967 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7968 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7969 [st]: https://github.com/rust-lang/rust/pull/26630
7970 [win1]: https://github.com/rust-lang/rust/pull/26569
7971 [win2]: https://github.com/rust-lang/rust/pull/26741
7972 [win3]: https://github.com/rust-lang/rust/pull/26741
7973 [win4]: https://github.com/rust-lang/rust/pull/27210
7974 [xp]: https://github.com/rust-lang/rust/pull/26569
7976 Version 1.2.0 (2015-08-07)
7977 ==========================
7979 * ~1200 changes, numerous bugfixes
7984 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7985 like `Rc` to contain types without a fixed size, arrays and trait
7986 objects, finally enabling use of `Rc<[T]>` and completing the
7987 implementation of DST.
7988 * [Parallel codegen][parcodegen] is now working again, which can
7989 substantially speed up large builds in debug mode; It also gets
7990 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7991 jobs). It's not enabled by default, but will be "in the near
7992 future". It can be activated with the `-C codegen-units=N` flag to
7994 * This is the first release with [experimental support for linking
7995 with the MSVC linker and lib C on Windows (instead of using the GNU
7996 variants via MinGW)][win]. It is yet recommended only for the most
7997 intrepid Rustaceans.
7998 * Benchmark compilations are showing a 30% improvement in
7999 bootstrapping over 1.1.
8004 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
8005 unicode case mapping, which is a previously-planned change in
8006 behavior and considered a bugfix.
8007 * [`mem::align_of`] now specifies [the *minimum alignment* for
8008 T][align], which is usually the alignment programs are interested
8009 in, and the same value reported by clang's
8010 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
8012 * [The `#[packed]` attribute is no longer silently accepted by the
8013 compiler][packed]. This attribute did nothing and code that
8014 mentioned it likely did not work as intended.
8015 * Associated type defaults are [now behind the
8016 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
8017 defaults *did not work*, but could be mentioned syntactically. As
8018 such this breakage has minimal impact.
8023 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8024 matching against dereferenceable values.
8029 * The [`Extend`] trait, which grows a collection from an iterator, is
8030 implemented over iterators of references, for `String`, `Vec`,
8031 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
8032 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
8033 * The [`iter::once`] function returns an iterator that yields a single
8034 element, and [`iter::empty`] returns an iterator that yields no
8036 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8037 over substring matches.
8038 * [`Cell`] and [`RefCell`] both implement `Eq`.
8039 * A number of methods for wrapping arithmetic are added to the
8040 integral types, [`wrapping_div`], [`wrapping_rem`],
8041 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8042 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8043 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8044 type.. It is illegal for the default arithmetic operations in Rust
8045 to overflow; the desire to wrap must be explicit.
8046 * The `{:#?}` formatting specifier [displays the alternate,
8047 pretty-printed][debugfmt] form of the `Debug` formatter. This
8048 feature was actually introduced prior to 1.0 with little
8050 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8051 for writing data to formatted strings, similar to [`io::Write`].
8052 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8053 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8054 are used by code generators to emit implementations of [`Debug`].
8055 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8056 methods that convert case, following Unicode case mapping.
8057 * It is now easier to handle poisoned locks. The [`PoisonError`]
8058 type, returned by failing lock operations, exposes `into_inner`,
8059 `get_ref`, and `get_mut`, which all give access to the inner lock
8060 guard, and allow the poisoned lock to continue to operate. The
8061 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8062 poisoned lock without attempting to take the lock.
8063 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8064 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8065 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8066 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8068 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8074 * `rustc` employs smarter heuristics for guessing at [typos].
8075 * `rustc` emits more efficient code for [no-op conversions between
8076 unsafe pointers][nop].
8077 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8078 resulting in faster compile times and smaller code.
8080 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8081 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8082 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8083 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8084 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8085 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8086 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8087 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8088 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8089 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8090 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8091 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8092 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8093 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8094 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8095 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8096 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8097 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8098 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8099 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8100 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8101 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8102 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8103 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8104 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8105 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8106 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8107 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8108 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8109 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8110 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8111 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8112 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8113 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8114 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8115 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8116 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8117 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8118 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8119 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8120 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8121 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8122 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8123 [align]: https://github.com/rust-lang/rust/pull/25646
8124 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8125 [typos]: https://github.com/rust-lang/rust/pull/26087
8126 [nop]: https://github.com/rust-lang/rust/pull/26336
8127 [fat]: https://github.com/rust-lang/rust/pull/26411
8128 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8129 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8130 [packed]: https://github.com/rust-lang/rust/pull/25541
8131 [ad]: https://github.com/rust-lang/rust/pull/27382
8132 [win]: https://github.com/rust-lang/rust/pull/25350
8134 Version 1.1.0 (2015-06-25)
8135 =========================
8137 * ~850 changes, numerous bugfixes
8142 * The [`std::fs` module has been expanded][fs] to expand the set of
8143 functionality exposed:
8144 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8145 don't incur a syscall on some platforms.
8146 * A `symlink_metadata` function has been added.
8147 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8148 access to all underlying information.
8149 * The compiler now contains extended explanations of many errors. When an error
8150 with an explanation occurs the compiler suggests using the `--explain` flag
8151 to read the explanation. Error explanations are also [available online][err-index].
8152 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8153 well as other work, the time to bootstrap the compiler decreased by
8159 * The [`str::split_whitespace`] method splits a string on unicode
8160 whitespace boundaries.
8161 * On both Windows and Unix, new extension traits provide conversion of
8162 I/O types to and from the underlying system handles. On Unix, these
8163 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8164 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8165 `TcpListener`, and `UpdSocket`. Further implementations for
8166 `std::process` will be stabilized later.
8167 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8168 Windows, symlinks can be created with
8169 `std::os::windows::symlink_dir` and
8170 `std::os::windows::symlink_file`.
8171 * The `mpsc::Receiver` type can now be converted into an iterator with
8172 `into_iter` on the [`IntoIterator`] trait.
8173 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8174 implementation of the [`From`] trait.
8175 * The `Debug` implementation for `RangeFull` [creates output that is
8176 more consistent with other implementations][rf].
8177 * [`Debug` is implemented for `File`][file].
8178 * The `Default` implementation for `Arc` [no longer requires `Sync +
8180 * [The `Iterator` methods `count`, `nth`, and `last` have been
8181 overridden for slices to have O(1) performance instead of O(n)][si].
8182 * Incorrect handling of paths on Windows has been improved in both the
8183 compiler and the standard library.
8184 * [`AtomicPtr` gained a `Default` implementation][ap].
8185 * In accordance with Rust's policy on arithmetic overflow `abs` now
8186 [panics on overflow when debug assertions are enabled][abs].
8187 * The [`Cloned`] iterator, which was accidentally left unstable for
8188 1.0 [has been stabilized][c].
8189 * The [`Incoming`] iterator, which iterates over incoming TCP
8190 connections, and which was accidentally unnamable in 1.0, [is now
8191 properly exported][inc].
8192 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8193 `sift_up` or `sift_down` panic][bh].
8194 * The [`split_off`] method of `LinkedList` [no longer corrupts
8195 the list in certain scenarios][ll].
8200 * Type checking performance [has improved notably][sk] with
8201 [multiple improvements][pre].
8202 * The compiler [suggests code changes][ch] for more errors.
8203 * rustc and it's build system have experimental support for [building
8204 toolchains against MUSL][m] instead of glibc on Linux.
8205 * The compiler defines the `target_env` cfg value, which is used for
8206 distinguishing toolchains that are otherwise for the same
8207 platform. Presently this is set to `gnu` for common GNU Linux
8208 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8209 * The [`cargo rustc`][crc] command invokes a build with custom flags
8211 * [Android executables are always position independent][pie].
8212 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8215 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8216 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8217 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8218 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8219 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8220 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8221 [rf]: https://github.com/rust-lang/rust/pull/24491
8222 [err-index]: https://doc.rust-lang.org/error-index.html
8223 [sk]: https://github.com/rust-lang/rust/pull/24615
8224 [pre]: https://github.com/rust-lang/rust/pull/25323
8225 [file]: https://github.com/rust-lang/rust/pull/24598
8226 [ch]: https://github.com/rust-lang/rust/pull/24683
8227 [arc]: https://github.com/rust-lang/rust/pull/24695
8228 [si]: https://github.com/rust-lang/rust/pull/24701
8229 [ap]: https://github.com/rust-lang/rust/pull/24834
8230 [m]: https://github.com/rust-lang/rust/pull/24777
8231 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8232 [crc]: https://github.com/rust-lang/cargo/pull/1568
8233 [pie]: https://github.com/rust-lang/rust/pull/24953
8234 [abs]: https://github.com/rust-lang/rust/pull/25441
8235 [c]: https://github.com/rust-lang/rust/pull/25496
8236 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8237 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8238 [inc]: https://github.com/rust-lang/rust/pull/25522
8239 [bh]: https://github.com/rust-lang/rust/pull/25856
8240 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8241 [ll]: https://github.com/rust-lang/rust/pull/26022
8242 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8243 [drop]: https://github.com/rust-lang/rust/pull/24935
8245 Version 1.0.0 (2015-05-15)
8246 ========================
8248 * ~1500 changes, numerous bugfixes
8253 * The vast majority of the standard library is now `#[stable]`. It is
8254 no longer possible to use unstable features with a stable build of
8256 * Many popular crates on [crates.io] now work on the stable release
8258 * Arithmetic on basic integer types now [checks for overflow in debug
8264 * Several [restrictions have been added to trait coherence][coh] in
8265 order to make it easier for upstream authors to change traits
8266 without breaking downstream code.
8267 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8268 improve error messages and macro behavior. For example, `0b1234` is
8269 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8270 * Trait bounds [are always invariant][inv], eliminating the need for
8271 the `PhantomFn` and `MarkerTrait` lang items, which have been
8273 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8274 "foo" as bar` syntax has been replaced with `extern crate foo as
8275 bar`, and Cargo now automatically translates "-" in *package* names
8276 to underscore for the crate name.
8277 * [Lifetime shadowing is an error][lt].
8278 * [`Send` no longer implies `'static`][send-rfc].
8279 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8280 `MyType::default()`.
8281 * Primitive types [now have inherent methods][prim-inherent],
8282 obviating the need for extension traits like `SliceExt`.
8283 * Methods with `Self: Sized` in their `where` clause are [considered
8284 object-safe][self-sized], allowing many extension traits like
8285 `IteratorExt` to be merged into the traits they extended.
8286 * You can now [refer to associated types][assoc-where] whose
8287 corresponding trait bounds appear only in a `where` clause.
8288 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8289 like `Send` and `Sync` are now library-defined.
8290 * A [Reflect trait][reflect] was introduced, which means that
8291 downcasting via the `Any` trait is effectively limited to concrete
8292 types. This helps retain the potentially-important "parametricity"
8293 property: generic code cannot behave differently for different type
8294 arguments except in minor ways.
8295 * The `unsafe_destructor` feature is now deprecated in favor of the
8296 [new `dropck`][dropck]. This change is a major reduction in unsafe
8302 * The `thread_local` module [has been renamed to `std::thread`][th].
8303 * The methods of `IteratorExt` [have been moved to the `Iterator`
8305 * Several traits that implement Rust's conventions for type
8306 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8307 [centralized in the `std::convert` module][con].
8308 * The `FromError` trait [was removed in favor of `From`][fe].
8309 * The basic sleep function [has moved to
8310 `std::thread::sleep_ms`][slp].
8311 * The `splitn` function now takes an `n` parameter that represents the
8312 number of items yielded by the returned iterator [instead of the
8313 number of 'splits'][spl].
8314 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8315 * [Derived implementations of `PartialOrd` now order enums according
8316 to their explicitly-assigned discriminants][po].
8317 * [Methods for searching strings are generic over `Pattern`s][pat],
8318 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8320 * [In method resolution, object methods are resolved before inherent
8322 * [`String::from_str` has been deprecated in favor of the `From` impl,
8323 `String::from`][sf].
8324 * [`io::Error` implements `Sync`][ios].
8325 * [The `words` method on `&str` has been replaced with
8326 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8328 * The new path and IO modules are complete and `#[stable]`. This
8329 was the major library focus for this cycle.
8330 * The path API was [revised][path-normalize] to normalize `.`,
8331 adjusting the tradeoffs in favor of the most common usage.
8332 * A large number of remaining APIs in `std` were also stabilized
8333 during this cycle; about 75% of the non-deprecated API surface
8335 * The new [string pattern API][string-pattern] landed, which makes
8336 the string slice API much more internally consistent and flexible.
8337 * A new set of [generic conversion traits][conversion] replaced
8338 many existing ad hoc traits.
8339 * Generic numeric traits were [completely removed][num-traits]. This
8340 was made possible thanks to inherent methods for primitive types,
8341 and the removal gives maximal flexibility for designing a numeric
8342 hierarchy in the future.
8343 * The `Fn` traits are now related via [inheritance][fn-inherit]
8344 and provide ergonomic [blanket implementations][fn-blanket].
8345 * The `Index` and `IndexMut` traits were changed to
8346 [take the index by value][index-value], enabling code like
8347 `hash_map["string"]` to work.
8348 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8349 `Copy` data is known to be `Clone` as well.
8354 * Many errors now have extended explanations that can be accessed with
8355 the `--explain` flag to `rustc`.
8356 * Many new examples have been added to the standard library
8358 * rustdoc has received a number of improvements focused on completion
8360 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8361 * Much headway was made on ecosystem-wide CI, making it possible
8362 to [compare builds for breakage][ci-compare].
8365 [crates.io]: http://crates.io
8366 [clo]: https://github.com/rust-lang/rust/pull/24034
8367 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8368 [con]: https://github.com/rust-lang/rust/pull/23875
8369 [cr]: https://github.com/rust-lang/rust/pull/23419
8370 [fe]: https://github.com/rust-lang/rust/pull/23879
8371 [ie]: https://github.com/rust-lang/rust/pull/23300
8372 [inv]: https://github.com/rust-lang/rust/pull/23938
8373 [ios]: https://github.com/rust-lang/rust/pull/24133
8374 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8375 [lt]: https://github.com/rust-lang/rust/pull/24057
8376 [meth]: https://github.com/rust-lang/rust/pull/24056
8377 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8378 [po]: https://github.com/rust-lang/rust/pull/24270
8379 [sf]: https://github.com/rust-lang/rust/pull/24517
8380 [slp]: https://github.com/rust-lang/rust/pull/23949
8381 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8382 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8383 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8384 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8385 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8386 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8387 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8388 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8389 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8390 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8391 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8392 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8393 [reflect]: https://github.com/rust-lang/rust/pull/23712
8394 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8395 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8396 [index-value]: https://github.com/rust-lang/rust/pull/23601
8397 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8398 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8399 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8400 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8401 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8402 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8405 Version 1.0.0-alpha.2 (2015-02-20)
8406 =====================================
8408 * ~1300 changes, numerous bugfixes
8412 * The various I/O modules were [overhauled][io-rfc] to reduce
8413 unnecessary abstractions and provide better interoperation with
8414 the underlying platform. The old `io` module remains temporarily
8416 * The standard library now [participates in feature gating][feat],
8417 so use of unstable libraries now requires a `#![feature(...)]`
8418 attribute. The impact of this change is [described on the
8419 forum][feat-forum]. [RFC][feat-rfc].
8423 * `for` loops [now operate on the `IntoIterator` trait][into],
8424 which eliminates the need to call `.iter()`, etc. to iterate
8425 over collections. There are some new subtleties to remember
8426 though regarding what sort of iterators various types yield, in
8427 particular that `for foo in bar { }` yields values from a move
8428 iterator, destroying the original collection. [RFC][into-rfc].
8429 * Objects now have [default lifetime bounds][obj], so you don't
8430 have to write `Box<Trait+'static>` when you don't care about
8431 storing references. [RFC][obj-rfc].
8432 * In types that implement `Drop`, [lifetimes must outlive the
8433 value][drop]. This will soon make it possible to safely
8434 implement `Drop` for types where `#[unsafe_destructor]` is now
8435 required. Read the [gorgeous RFC][drop-rfc] for details.
8436 * The fully qualified <T as Trait>::X syntax lets you set the Self
8437 type for a trait method or associated type. [RFC][ufcs-rfc].
8438 * References to types that implement `Deref<U>` now [automatically
8439 coerce to references][deref] to the dereferenced type `U`,
8440 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8441 should eliminate many unsightly uses of `&*`, as when converting
8442 from references to vectors into references to
8443 slices. [RFC][deref-rfc].
8444 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8445 `|:|`) is obsolete and closure kind is inferred from context.
8446 * [`Self` is a keyword][Self].
8450 * The `Show` and `String` formatting traits [have been
8451 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8452 their related purposes. Automatically getting a string
8453 conversion to use with `format!("{:?}", something_to_debug)` is
8454 now written `#[derive(Debug)]`.
8455 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8456 OsStr}`, provide strings in platform-specific encodings for easier
8457 interop with system APIs. [RFC][osstr-rfc].
8458 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8459 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8460 creating raw pointers.
8464 * Certain long error messages of the form 'expected foo found bar'
8465 are now [split neatly across multiple
8466 lines][multiline]. Examples in the PR.
8467 * On Unix Rust can be [uninstalled][un] by running
8468 `/usr/local/lib/rustlib/uninstall.sh`.
8469 * The `#[rustc_on_unimplemented]` attribute, requiring the
8470 'on_unimplemented' feature, lets rustc [display custom error
8471 messages when a trait is expected to be implemented for a type
8476 * Rust is tested against a [LALR grammar][lalr], which parses
8477 almost all the Rust files that rustc does.
8479 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8480 [close]: https://github.com/rust-lang/rust/pull/21843
8481 [deref]: https://github.com/rust-lang/rust/pull/21351
8482 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8483 [drop]: https://github.com/rust-lang/rust/pull/21972
8484 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8485 [feat]: https://github.com/rust-lang/rust/pull/21248
8486 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8487 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8488 [fmt]: https://github.com/rust-lang/rust/pull/21457
8489 [into]: https://github.com/rust-lang/rust/pull/20790
8490 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8491 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8492 [lalr]: https://github.com/rust-lang/rust/pull/21452
8493 [multiline]: https://github.com/rust-lang/rust/pull/19870
8494 [obj]: https://github.com/rust-lang/rust/pull/22230
8495 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8496 [onun]: https://github.com/rust-lang/rust/pull/20889
8497 [osstr]: https://github.com/rust-lang/rust/pull/21488
8498 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8499 [Self]: https://github.com/rust-lang/rust/pull/22158
8500 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8501 [un]: https://github.com/rust-lang/rust/pull/22256
8504 Version 1.0.0-alpha (2015-01-09)
8505 ==================================
8507 * ~2400 changes, numerous bugfixes
8511 * The language itself is considered feature complete for 1.0,
8512 though there will be many usability improvements and bugfixes
8513 before the final release.
8514 * Nearly 50% of the public API surface of the standard library has
8515 been declared 'stable'. Those interfaces are unlikely to change
8517 * The long-running debate over integer types has been
8518 [settled][ints]: Rust will ship with types named `isize` and
8519 `usize`, rather than `int` and `uint`, for pointer-sized
8520 integers. Guidelines will be rolled out during the alpha cycle.
8521 * Most crates that are not `std` have been moved out of the Rust
8522 distribution into the Cargo ecosystem so they can evolve
8523 separately and don't need to be stabilized as quickly, including
8524 'time', 'getopts', 'num', 'regex', and 'term'.
8525 * Documentation continues to be expanded with more API coverage, more
8526 examples, and more in-depth explanations. The guides have been
8527 consolidated into [The Rust Programming Language][trpl].
8528 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8529 * All official Rust binary installers now come with [Cargo], the
8530 Rust package manager.
8534 * Closures have been [completely redesigned][unboxed] to be
8535 implemented in terms of traits, can now be used as generic type
8536 bounds and thus monomorphized and inlined, or via an opaque
8537 pointer (boxed) as in the old system. The new system is often
8538 referred to as 'unboxed' closures.
8539 * Traits now support [associated types][assoc], allowing families
8540 of related types to be defined together and used generically in
8542 * Enum variants are [namespaced by their type names][enum].
8543 * [`where` clauses][where] provide a more versatile and attractive
8544 syntax for specifying generic bounds, though the previous syntax
8546 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8548 * Rust [no longer has a runtime][rt] of any description, and only
8549 supports OS threads, not green threads.
8550 * At long last, Rust has been overhauled for 'dynamically-sized
8551 types' ([DST]), which integrates 'fat pointers' (object types,
8552 arrays, and `str`) more deeply into the type system, making it
8554 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8555 `..j` that produce range types and which, when combined with the
8556 `Index` operator and multidispatch, leads to a convenient slice
8558 * The new range syntax revealed an ambiguity in the fixed-length
8559 array syntax, so now fixed length arrays [are written `[T;
8561 * The `Copy` trait is no longer implemented automatically. Unsafe
8562 pointers no longer implement `Sync` and `Send` so types
8563 containing them don't automatically either. `Sync` and `Send`
8564 are now 'unsafe traits' so one can "forcibly" implement them via
8565 `unsafe impl` if a type confirms to the requirements for them
8566 even though the internals do not (e.g. structs containing unsafe
8567 pointers like `Arc`). These changes are intended to prevent some
8568 footguns and are collectively known as [opt-in built-in
8569 traits][oibit] (though `Sync` and `Send` will soon become pure
8570 library types unknown to the compiler).
8571 * Operator traits now take their operands [by value][ops], and
8572 comparison traits can use multidispatch to compare one type
8573 against multiple other types, allowing e.g. `String` to be
8574 compared with `&str`.
8575 * `if let` and `while let` are no longer feature-gated.
8576 * Rust has adopted a more [uniform syntax for escaping unicode
8577 characters][unicode].
8578 * `macro_rules!` [has been declared stable][mac]. Though it is a
8579 flawed system it is sufficiently popular that it must be usable
8580 for 1.0. Effort has gone into [future-proofing][mac-future] it
8581 in ways that will allow other macro systems to be developed in
8582 parallel, and won't otherwise impact the evolution of the
8584 * The prelude has been [pared back significantly][prelude] such
8585 that it is the minimum necessary to support the most pervasive
8586 code patterns, and through [generalized where clauses][where]
8587 many of the prelude extension traits have been consolidated.
8588 * Rust's rudimentary reflection [has been removed][refl], as it
8589 incurred too much code generation for little benefit.
8590 * [Struct variants][structvars] are no longer feature-gated.
8591 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8592 known as 'higher-ranked trait bounds', this crucially allows
8593 unboxed closures to work.
8594 * Macros invocations surrounded by parens or square brackets and
8595 not terminated by a semicolon are [parsed as
8596 expressions][macros], which makes expressions like `vec![1i32,
8597 2, 3].len()` work as expected.
8598 * Trait objects now implement their traits automatically, and
8599 traits that can be coerced to objects now must be [object
8601 * Automatically deriving traits is now done with `#[derive(...)]`
8602 not `#[deriving(...)]` for [consistency with other naming
8603 conventions][derive].
8604 * Importing the containing module or enum at the same time as
8605 items or variants they contain is [now done with `self` instead
8606 of `mod`][self], as in use `foo::{self, bar}`
8607 * Glob imports are no longer feature-gated.
8608 * The `box` operator and `box` patterns have been feature-gated
8609 pending a redesign. For now unique boxes should be allocated
8610 like other containers, with `Box::new`.
8614 * A [series][coll1] of [efforts][coll2] to establish
8615 [conventions][coll3] for collections types has resulted in API
8616 improvements throughout the standard library.
8617 * New [APIs for error handling][err] provide ergonomic interop
8618 between error types, and [new conventions][err-conv] describe
8619 more clearly the recommended error handling strategies in Rust.
8620 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8621 it is easier to discuss failure in the context of error handling
8622 without making clarifications as to whether you are referring to
8623 the 'fail' macro or failure more generally.
8624 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8625 syscall when available.
8626 * The 'serialize' crate has been renamed 'rustc-serialize' and
8627 moved out of the distribution to Cargo. Although it is widely
8628 used now, it is expected to be superseded in the near future.
8629 * The `Show` formatter, typically implemented with
8630 `#[derive(Show)]` is [now requested with the `{:?}`
8631 specifier][show] and is intended for use by all types, for uses
8632 such as `println!` debugging. The new `String` formatter must be
8633 implemented by hand, uses the `{}` specifier, and is intended
8634 for full-fidelity conversions of things that can logically be
8635 represented as strings.
8639 * [Flexible target specification][flex] allows rustc's code
8640 generation to be configured to support otherwise-unsupported
8642 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8643 respective debuggers with Rust-appropriate pretty-printing.
8644 * The Windows installation of Rust is distributed with the
8645 MinGW components currently required to link binaries on that
8650 * Nullable enum optimizations have been extended to more types so
8651 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8652 space than the inner types themselves.
8653 * Work has begun on supporting AArch64.
8655 [Cargo]: https://crates.io
8656 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8657 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8658 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8659 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8660 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8661 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8662 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8663 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8664 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8665 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8666 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8667 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8668 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8669 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8670 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8671 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8672 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8673 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8674 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8675 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8676 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8677 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8678 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8679 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8680 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8681 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8682 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8683 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8684 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8685 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8686 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8687 [trpl]: https://doc.rust-lang.org/book/index.html
8688 [rbe]: http://rustbyexample.com/
8691 Version 0.12.0 (2014-10-09)
8692 =============================
8694 * ~1900 changes, numerous bugfixes
8698 * The introductory documentation (now called The Rust Guide) has
8699 been completely rewritten, as have a number of supplementary
8701 * Rust's package manager, Cargo, continues to improve and is
8702 sometimes considered to be quite awesome.
8703 * Many API's in `std` have been reviewed and updated for
8704 consistency with the in-development Rust coding
8705 guidelines. The standard library documentation tracks
8706 stabilization progress.
8707 * Minor libraries have been moved out-of-tree to the rust-lang org
8708 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8709 be installed with Cargo.
8710 * Lifetime elision allows lifetime annotations to be left off of
8711 function declarations in many common scenarios.
8712 * Rust now works on 64-bit Windows.
8715 * Indexing can be overloaded with the `Index` and `IndexMut`
8717 * The `if let` construct takes a branch only if the `let` pattern
8718 matches, currently behind the 'if_let' feature gate.
8719 * 'where clauses', a more flexible syntax for specifying trait
8720 bounds that is more aesthetic, have been added for traits and
8721 free functions. Where clauses will in the future make it
8722 possible to constrain associated types, which would be
8723 impossible with the existing syntax.
8724 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8725 the 'slicing_syntax' feature gate, and can be overloaded with
8726 the `Slice` or `SliceMut` traits.
8727 * The syntax for matching of sub-slices has been changed to use a
8728 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8729 consistency with other uses of `..` and to future-proof
8730 potential additional uses of the syntax.
8731 * The syntax for matching inclusive ranges in patterns has changed
8732 from `0..3` to `0...4` to be consistent with the exclusive range
8734 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8735 c]`) has been put behind the 'advanced_slice_patterns' feature
8736 gate and may be removed in the future.
8737 * Components of tuples and tuple structs can be extracted using
8738 the `value.0` syntax, currently behind the `tuple_indexing`
8740 * The `#[crate_id]` attribute is no longer supported; versioning
8741 is handled by the package manager.
8742 * Renaming crate imports are now written `extern crate foo as bar`
8743 instead of `extern crate bar = foo`.
8744 * Renaming use statements are now written `use foo as bar` instead
8746 * `let` and `match` bindings and argument names in macros are now
8748 * The new, more efficient, closure types ('unboxed closures') have
8749 been added under a feature gate, 'unboxed_closures'. These will
8750 soon replace the existing closure types, once higher-ranked
8751 trait lifetimes are added to the language.
8752 * `move` has been added as a keyword, for indicating closures
8753 that capture by value.
8754 * Mutation and assignment is no longer allowed in pattern guards.
8755 * Generic structs and enums can now have trait bounds.
8756 * The `Share` trait is now called `Sync` to free up the term
8757 'shared' to refer to 'shared reference' (the default reference
8759 * Dynamically-sized types have been mostly implemented,
8760 unifying the behavior of fat-pointer types with the rest of the
8762 * As part of dynamically-sized types, the `Sized` trait has been
8763 introduced, which qualifying types implement by default, and
8764 which type parameters expect by default. To specify that a type
8765 parameter does not need to be sized, write `<Sized? T>`. Most
8766 types are `Sized`, notable exceptions being unsized arrays
8767 (`[T]`) and trait types.
8768 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8769 * Lifetime bounds can now be applied to type parameters and object
8771 * The old, reference counted GC type, `Gc<T>` which was once
8772 denoted by the `@` sigil, has finally been removed. GC will be
8773 revisited in the future.
8776 * Library documentation has been improved for a number of modules.
8777 * Bit-vectors, collections::bitv has been modernized.
8778 * The url crate is deprecated in favor of
8779 http://github.com/servo/rust-url, which can be installed with
8781 * Most I/O stream types can be cloned and subsequently closed from
8783 * A `std::time::Duration` type has been added for use in I/O
8784 methods that rely on timers, as well as in the 'time' crate's
8785 `Timespec` arithmetic.
8786 * The runtime I/O abstraction layer that enabled the green thread
8787 scheduler to do non-thread-blocking I/O has been removed, along
8788 with the libuv-based implementation employed by the green thread
8789 scheduler. This will greatly simplify the future I/O work.
8790 * `collections::btree` has been rewritten to have a more
8791 idiomatic and efficient design.
8794 * rustdoc output now indicates the stability levels of API's.
8795 * The `--crate-name` flag can specify the name of the crate
8796 being compiled, like `#[crate_name]`.
8797 * The `-C metadata` specifies additional metadata to hash into
8798 symbol names, and `-C extra-filename` specifies additional
8799 information to put into the output filename, for use by the
8800 package manager for versioning.
8801 * debug info generation has continued to improve and should be
8802 more reliable under both gdb and lldb.
8803 * rustc has experimental support for compiling in parallel
8804 using the `-C codegen-units` flag.
8805 * rustc no longer encodes rpath information into binaries by
8809 * Stack usage has been optimized with LLVM lifetime annotations.
8810 * Official Rust binaries on Linux are more compatible with older
8811 kernels and distributions, built on CentOS 5.10.
8814 Version 0.11.0 (2014-07-02)
8815 ==========================
8817 * ~1700 changes, numerous bugfixes
8820 * ~[T] has been removed from the language. This type is superseded by
8822 * ~str has been removed from the language. This type is superseded by
8824 * ~T has been removed from the language. This type is superseded by the
8826 * @T has been removed from the language. This type is superseded by the
8827 standard library's std::gc::Gc<T> type.
8828 * Struct fields are now all private by default.
8829 * Vector indices and shift amounts are both required to be a `uint`
8830 instead of any integral type.
8831 * Byte character, byte string, and raw byte string literals are now all
8832 supported by prefixing the normal literal with a `b`.
8833 * Multiple ABIs are no longer allowed in an ABI string
8834 * The syntax for lifetimes on closures/procedures has been tweaked
8835 slightly: `<'a>|A, B|: 'b + K -> T`
8836 * Floating point modulus has been removed from the language; however it
8837 is still provided by a library implementation.
8838 * Private enum variants are now disallowed.
8839 * The `priv` keyword has been removed from the language.
8840 * A closure can no longer be invoked through a &-pointer.
8841 * The `use foo, bar, baz;` syntax has been removed from the language.
8842 * The transmute intrinsic no longer works on type parameters.
8843 * Statics now allow blocks/items in their definition.
8844 * Trait bounds are separated from objects with + instead of : now.
8845 * Objects can no longer be read while they are mutably borrowed.
8846 * The address of a static is now marked as insignificant unless the
8847 #[inline(never)] attribute is placed it.
8848 * The #[unsafe_destructor] attribute is now behind a feature gate.
8849 * Struct literals are no longer allowed in ambiguous positions such as
8850 if, while, match, and for..in.
8851 * Declaration of lang items and intrinsics are now feature-gated by
8853 * Integral literals no longer default to `int`, and floating point
8854 literals no longer default to `f64`. Literals must be suffixed with an
8855 appropriate type if inference cannot determine the type of the
8857 * The Box<T> type is no longer implicitly borrowed to &mut T.
8858 * Procedures are now required to not capture borrowed references.
8861 * The standard library is now a "facade" over a number of underlying
8862 libraries. This means that development on the standard library should
8863 be speedier due to smaller crates, as well as a clearer line between
8865 * A new library, libcore, lives under the standard library's facade
8866 which is Rust's "0-assumption" library, suitable for embedded and
8867 kernel development for example.
8868 * A regex crate has been added to the standard distribution. This crate
8869 includes statically compiled regular expressions.
8870 * The unwrap/unwrap_err methods on Result require a Show bound for
8871 better error messages.
8872 * The return types of the std::comm primitives have been centralized
8873 around the Result type.
8874 * A number of I/O primitives have gained the ability to time out their
8876 * A number of I/O primitives have gained the ability to close their
8877 reading/writing halves to cancel pending operations.
8878 * Reverse iterator methods have been removed in favor of `rev()` on
8879 their forward-iteration counterparts.
8880 * A bitflags! macro has been added to enable easy interop with C and
8881 management of bit flags.
8882 * A debug_assert! macro is now provided which is disabled when
8883 `--cfg ndebug` is passed to the compiler.
8884 * A graphviz crate has been added for creating .dot files.
8885 * The std::cast module has been migrated into std::mem.
8886 * The std::local_data api has been migrated from freestanding functions
8887 to being based on methods.
8888 * The Pod trait has been renamed to Copy.
8889 * jemalloc has been added as the default allocator for types.
8890 * The API for allocating memory has been changed to use proper alignment
8891 and sized deallocation
8892 * Connecting a TcpStream or binding a TcpListener is now based on a
8893 string address and a u16 port. This allows connecting to a hostname as
8895 * The Reader trait now contains a core method, read_at_least(), which
8896 correctly handles many repeated 0-length reads.
8897 * The process-spawning API is now centered around a builder-style
8899 * The :? printing qualifier has been moved from the standard library to
8900 an external libdebug crate.
8901 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8902 have been renamed to Eq/Ord.
8903 * The select/plural methods have been removed from format!. The escapes
8904 for { and } have also changed from \{ and \} to {{ and }},
8906 * The TaskBuilder API has been re-worked to be a true builder, and
8907 extension traits for spawning native/green tasks have been added.
8910 * All breaking changes to the language or libraries now have their
8911 commit message annotated with `[breaking-change]` to allow for easy
8912 discovery of breaking changes.
8913 * The compiler will now try to suggest how to annotate lifetimes if a
8914 lifetime-related error occurs.
8915 * Debug info continues to be improved greatly with general bug fixes and
8916 better support for situations like link time optimization (LTO).
8917 * Usage of syntax extensions when cross-compiling has been fixed.
8918 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8919 -fdata-sections and --gc-sections has been enabled by default
8920 * The compiler is now stricter about where it will load module files
8921 from when a module is declared via `mod foo;`.
8922 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8923 Syntax extensions are now discovered via a "plugin registrar" type
8924 which will be extended in the future to other various plugins.
8925 * Lints have been restructured to allow for dynamically loadable lints.
8926 * A number of rustdoc improvements:
8927 * The HTML output has been visually redesigned.
8928 * Markdown is now powered by hoedown instead of sundown.
8929 * Searching heuristics have been greatly improved.
8930 * The search index has been reduced in size by a great amount.
8931 * Cross-crate documentation via `pub use` has been greatly improved.
8932 * Primitive types are now hyperlinked and documented.
8933 * Documentation has been moved from static.rust-lang.org/doc to
8935 * A new sandbox, play.rust-lang.org, is available for running and
8936 sharing rust code examples on-line.
8937 * Unused attributes are now more robustly warned about.
8938 * The dead_code lint now warns about unused struct fields.
8939 * Cross-compiling to iOS is now supported.
8940 * Cross-compiling to mipsel is now supported.
8941 * Stability attributes are now inherited by default and no longer apply
8942 to intra-crate usage, only inter-crate usage.
8943 * Error message related to non-exhaustive match expressions have been
8947 Version 0.10 (2014-04-03)
8948 =========================
8950 * ~1500 changes, numerous bugfixes
8953 * A new RFC process is now in place for modifying the language.
8954 * Patterns with `@`-pointers have been removed from the language.
8955 * Patterns with unique vectors (`~[T]`) have been removed from the
8957 * Patterns with unique strings (`~str`) have been removed from the
8959 * `@str` has been removed from the language.
8960 * `@[T]` has been removed from the language.
8961 * `@self` has been removed from the language.
8962 * `@Trait` has been removed from the language.
8963 * Headers on `~` allocations which contain `@` boxes inside the type for
8964 reference counting have been removed.
8965 * The semantics around the lifetimes of temporary expressions have changed,
8966 see #3511 and #11585 for more information.
8967 * Cross-crate syntax extensions are now possible, but feature gated. See
8968 #11151 for more information. This includes both `macro_rules!` macros as
8969 well as syntax extensions such as `format!`.
8970 * New lint modes have been added, and older ones have been turned on to be
8972 * Unnecessary parentheses
8975 * Uppercase variables
8976 * Publicly visible private types
8977 * `#[deriving]` with raw pointers
8978 * Unsafe functions can no longer be coerced to closures.
8979 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8980 * The `#[simd]` attribute is now behind a feature gate.
8981 * Visibility is no longer allowed on `extern crate` statements, and
8982 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8983 * Trailing commas are now allowed in argument lists and tuple patterns.
8984 * The `do` keyword has been removed, it is now a reserved keyword.
8985 * Default type parameters have been implemented, but are feature gated.
8986 * Borrowed variables through captures in closures are now considered soundly.
8987 * `extern mod` is now `extern crate`
8988 * The `Freeze` trait has been removed.
8989 * The `Share` trait has been added for types that can be shared among
8991 * Labels in macros are now hygienic.
8992 * Expression/statement macro invocations can be delimited with `{}` now.
8993 * Treatment of types allowed in `static mut` locations has been tweaked.
8994 * The `*` and `.` operators are now overloadable through the `Deref` and
8996 * `~Trait` and `proc` no longer have `Send` bounds by default.
8997 * Partial type hints are now supported with the `_` type marker.
8998 * An `Unsafe` type was introduced for interior mutability. It is now
8999 considered undefined to transmute from `&T` to `&mut T` without using the
9001 * The #[linkage] attribute was implemented for extern statics/functions.
9002 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
9003 * `Pod` was renamed to `Copy`.
9006 * The `libextra` library has been removed. It has now been decomposed into
9007 component libraries with smaller and more focused nuggets of
9008 functionality. The full list of libraries can be found on the
9009 documentation index page.
9010 * std: `std::condition` has been removed. All I/O errors are now propagated
9011 through the `Result` type. In order to assist with error handling, a
9012 `try!` macro for unwrapping errors with an early return and a lint for
9013 unused results has been added. See #12039 for more information.
9014 * std: The `vec` module has been renamed to `slice`.
9015 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
9016 This will become the only growable vector in the future.
9017 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
9018 are now found at `std::io::BufferedReader` instead of
9019 `std::io::buffered::BufferedReader`.
9020 * std: `print` and `println` are no longer in the prelude, the `print!` and
9021 `println!` macros are intended to be used instead.
9022 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
9023 attempts to statically prevent cycles.
9024 * std: The standard distribution is adopting the policy of pushing failure
9025 to the user rather than failing in libraries. Many functions (such as
9026 `slice::last()`) now return `Option<T>` instead of `T` + failing.
9027 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
9028 deriving mode: `#[deriving(Show)]`.
9029 * std: `ToStr` is now implemented for all types implementing `Show`.
9030 * std: The formatting trait methods now take `&self` instead of `&T`
9031 * std: The `invert()` method on iterators has been renamed to `rev()`
9032 * std: `std::num` has seen a reduction in the genericity of its traits,
9033 consolidating functionality into a few core traits.
9034 * std: Backtraces are now printed on task failure if the environment
9035 variable `RUST_BACKTRACE` is present.
9036 * std: Naming conventions for iterators have been standardized. More details
9037 can be found on the wiki's style guide.
9038 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9039 still implement the function.
9040 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9041 * std: `assert_approx_eq!` has been removed
9042 * std: The `e` and `E` formatting specifiers for floats have been added to
9043 print them in exponential notation.
9044 * std: The `Times` trait has been removed
9045 * std: Indications of variance and opting out of builtin bounds is done
9046 through marker types in `std::kinds::marker` now
9047 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9048 `#[deriving(Hash)]` is now possible.
9049 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9050 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9051 * std: `Chan::new` is now `channel()`.
9052 * std: A new synchronous channel type has been implemented.
9053 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9054 * std: `hashmap` and `trie` have been moved to `libcollections`
9055 * std: `run` has been rolled into `io::process`
9056 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9057 * std: The equality and comparison traits have seen some reorganization.
9058 * std: `rand` has moved to `librand`.
9059 * std: `to_{lower,upper}case` has been implemented for `char`.
9060 * std: Logging has been moved to `liblog`.
9061 * collections: `HashMap` has been rewritten for higher performance and less
9063 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9064 it can be booted manually. The runtime guide has more information and
9066 * native: All I/O functionality except signals has been implemented.
9067 * green: Task spawning with `libgreen` has been optimized with stack caching
9068 and various trimming of code.
9069 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9070 * sync: The `extra::sync` module has been updated to modern rust (and moved
9071 to the `sync` library), tweaking and improving various interfaces while
9072 dropping redundant functionality.
9073 * sync: A new `Barrier` type has been added to the `sync` library.
9074 * sync: An efficient mutex for native and green tasks has been implemented.
9075 * serialize: The `base64` module has seen some improvement. It treats
9076 newlines better, has non-string error values, and has seen general
9078 * fourcc: A `fourcc!` macro was introduced
9079 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9080 hexadecimal literal.
9083 * `rustpkg` has been deprecated and removed from the main repository. Its
9084 replacement, `cargo`, is under development.
9085 * Nightly builds of rust are now available
9086 * The memory usage of rustc has been improved many times throughout this
9088 * The build process supports disabling rpath support for the rustc binary
9090 * Code generation has improved in some cases, giving more information to the
9091 LLVM optimization passes to enable more extensive optimizations.
9092 * Debuginfo compatibility with lldb on OSX has been restored.
9093 * The master branch is now gated on an android bot, making building for
9094 android much more reliable.
9095 * Output flags have been centralized into one `--emit` flag.
9096 * Crate type flags have been centralized into one `--crate-type` flag.
9097 * Codegen flags have been consolidated behind a `-C` flag.
9098 * Linking against outdated crates now has improved error messages.
9099 * Error messages with lifetimes will often suggest how to annotate the
9100 function to fix the error.
9101 * Many more types are documented in the standard library, and new guides
9103 * Many `rustdoc` improvements:
9104 * code blocks are syntax highlighted.
9105 * render standalone markdown files.
9106 * the --test flag tests all code blocks by default.
9107 * exported macros are displayed.
9108 * re-exported types have their documentation inlined at the location of the
9110 * search works across crates that have been rendered to the same output
9114 Version 0.9 (2014-01-09)
9115 ==========================
9117 * ~1800 changes, numerous bugfixes
9120 * The `float` type has been removed. Use `f32` or `f64` instead.
9121 * A new facility for enabling experimental features (feature gating) has
9122 been added, using the crate-level `#[feature(foo)]` attribute.
9123 * Managed boxes (@) are now behind a feature gate
9124 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9125 standard library's `Gc` or `Rc` types instead.
9126 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9127 * Jumping back to the top of a loop is now done with `continue` instead of
9129 * Strings can no longer be mutated through index assignment.
9130 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9131 hash delimiters, as in `r###"foo"###`.
9132 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9134 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9135 * `@fn`s have been removed.
9136 * `do` only works with procs in order to make it obvious what the cost
9138 * Single-element tuple-like structs can no longer be dereferenced to
9139 obtain the inner value. A more comprehensive solution for overloading
9140 the dereference operator will be provided in the future.
9141 * The `#[link(...)]` attribute has been replaced with
9142 `#[crate_id = "name#vers"]`.
9143 * Empty `impl`s must be terminated with empty braces and may not be
9144 terminated with a semicolon.
9145 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9146 no longer has any special meaning.
9147 * The old `fmt!` string formatting macro has been removed.
9148 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9149 `print!` and `println!`.
9150 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9151 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9152 `extern mod foo = "bar"` instead.
9153 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9154 * Macros can have attributes.
9155 * Macros can expand to items with attributes.
9156 * Macros can expand to multiple items.
9157 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9158 * Comments may be nested.
9159 * Values automatically coerce to trait objects they implement, without
9161 * Enum discriminants are no longer an entire word but as small as needed to
9162 contain all the variants. The `repr` attribute can be used to override
9163 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9164 `#[repr(C)]` to match C enums.
9165 * Non-string literals are not allowed in attributes (they never worked).
9166 * The FFI now supports variadic functions.
9167 * Octal numeric literals, as in `0o7777`.
9168 * The `concat!` syntax extension performs compile-time string concatenation.
9169 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9170 removed as Rust no longer uses segmented stacks.
9171 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9172 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9173 not `*`; ignoring remaining fields of a struct is also done with `..`,
9174 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9175 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9176 * `rustc` supports the "system" calling convention, which defaults to the
9177 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9179 * The `type_overflow` lint (default: warn) checks literals for overflow.
9180 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9181 * The `attribute_usage` lint (default: warn) warns about unknown
9183 * The `unknown_features` lint (default: warn) warns about unknown
9185 * The `dead_code` lint (default: warn) checks for dead code.
9186 * Rust libraries can be linked statically to one another
9187 * `#[link_args]` is behind the `link_args` feature gate.
9188 * Native libraries are now linked with `#[link(name = "foo")]`
9189 * Native libraries can be statically linked to a rust crate
9190 (`#[link(name = "foo", kind = "static")]`).
9191 * Native OS X frameworks are now officially supported
9192 (`#[link(name = "foo", kind = "framework")]`).
9193 * The `#[thread_local]` attribute creates thread-local (not task-local)
9194 variables. Currently behind the `thread_local` feature gate.
9195 * The `return` keyword may be used in closures.
9196 * Types that can be copied via a memcpy implement the `Pod` kind.
9197 * The `cfg` attribute can now be used on struct fields and enum variants.
9200 * std: The `option` and `result` API's have been overhauled to make them
9201 simpler, more consistent, and more composable.
9202 * std: The entire `std::io` module has been replaced with one that is
9203 more comprehensive and that properly interfaces with the underlying
9204 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9206 * std: `io::util` contains a number of useful implementations of
9207 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9208 `ZeroReader`, `TeeReader`.
9209 * std: The reference counted pointer type `extra::rc` moved into std.
9210 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9211 just a wrapper around it).
9212 * std: The `Either` type has been removed.
9213 * std: `fmt::Default` can be implemented for any type to provide default
9214 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9215 * std: The `rand` API continues to be tweaked.
9216 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9217 on failure in gdb, is now named `rust_fail`.
9218 * std: The `each_key` and `each_value` methods on `HashMap` have been
9219 replaced by the `keys` and `values` iterators.
9220 * std: Functions dealing with type size and alignment have moved from the
9221 `sys` module to the `mem` module.
9222 * std: The `path` module was written and API changed.
9223 * std: `str::from_utf8` has been changed to cast instead of allocate.
9224 * std: `starts_with` and `ends_with` methods added to vectors via the
9225 `ImmutableEqVector` trait, which is in the prelude.
9226 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9227 if the index is out of bounds.
9228 * std: Task failure no longer propagates between tasks, as the model was
9229 complex, expensive, and incompatible with thread-based tasks.
9230 * std: The `Any` type can be used for dynamic typing.
9231 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9233 * std: Methods that produce iterators generally do not have an `_iter`
9235 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9236 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9237 * std: `util::ignore` renamed to `prelude::drop`.
9238 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9240 * std: `vec::raw` has seen a lot of cleanup and API changes.
9241 * std: The standard library no longer includes any C++ code, and very
9242 minimal C, eliminating the dependency on libstdc++.
9243 * std: Runtime scheduling and I/O functionality has been factored out into
9244 extensible interfaces and is now implemented by two different crates:
9245 libnative, for native threading and I/O; and libgreen, for green threading
9246 and I/O. This paves the way for using the standard library in more limited
9247 embedded environments.
9248 * std: The `comm` module has been rewritten to be much faster, have a
9249 simpler, more consistent API, and to work for both native and green
9251 * std: All libuv dependencies have been moved into the rustuv crate.
9252 * native: New implementations of runtime scheduling on top of OS threads.
9253 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9255 * green: The green thread scheduler and message passing types are almost
9257 * extra: The `flatpipes` module had bitrotted and was removed.
9258 * extra: All crypto functions have been removed and Rust now has a policy of
9259 not reimplementing crypto in the standard library. In the future crypto
9260 will be provided by external crates with bindings to established libraries.
9261 * extra: `c_vec` has been modernized.
9262 * extra: The `sort` module has been removed. Use the `sort` method on
9266 * The `rust` and `rusti` commands have been removed, due to lack of
9268 * `rustdoc` was completely rewritten.
9269 * `rustdoc` can test code examples in documentation.
9270 * `rustpkg` can test packages with the argument, 'test'.
9271 * `rustpkg` supports arbitrary dependencies, including C libraries.
9272 * `rustc`'s support for generating debug info is improved again.
9273 * `rustc` has better error reporting for unbalanced delimiters.
9274 * `rustc`'s JIT support was removed due to bitrot.
9275 * Executables and static libraries can be built with LTO (-Z lto)
9276 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9280 Version 0.8 (2013-09-26)
9281 ============================
9283 * ~2200 changes, numerous bugfixes
9286 * The `for` loop syntax has changed to work with the `Iterator` trait.
9287 * At long last, unwinding works on Windows.
9288 * Default methods are ready for use.
9289 * Many trait inheritance bugs fixed.
9290 * Owned and borrowed trait objects work more reliably.
9291 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9292 * rustc can omit emission of code for the `debug!` macro if it is passed
9294 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9295 for foo.rs, then foo/mod.rs, and will generate an error when both are
9297 * Strings no longer contain trailing nulls. The new `std::c_str` module
9298 provides new mechanisms for converting to C strings.
9299 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9300 * The FFI has been overhauled such that foreign functions are called directly,
9301 instead of through a stack-switching wrapper.
9302 * Calling a foreign function must be done through a Rust function with the
9303 `#[fixed_stack_segment]` attribute.
9304 * The `externfn!` macro can be used to declare both a foreign function and
9305 a `#[fixed_stack_segment]` wrapper at once.
9306 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9307 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9308 * `priv` is disallowed everywhere except for struct fields and enum variants.
9309 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9310 * `ref` bindings in irrefutable patterns work correctly now.
9311 * `char` is now prevented from containing invalid code points.
9312 * Casting to `bool` is no longer allowed.
9313 * `\0` is now accepted as an escape in chars and strings.
9314 * `yield` is a reserved keyword.
9315 * `typeof` is a reserved keyword.
9316 * Crates may be imported by URL with `extern mod foo = "url";`.
9317 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9318 * Static vectors can be initialized with repeating elements,
9319 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9320 * Static structs can be initialized with functional record update,
9321 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9322 * `cfg!` can be used to conditionally execute code based on the crate
9323 configuration, similarly to `#[cfg(...)]`.
9324 * The `unnecessary_qualification` lint detects unneeded module
9325 prefixes (default: allow).
9326 * Arithmetic operations have been implemented on the SIMD types in
9327 `std::unstable::simd`.
9328 * Exchange allocation headers were removed, reducing memory usage.
9329 * `format!` implements a completely new, extensible, and higher-performance
9330 string formatting system. It will replace `fmt!`.
9331 * `print!` and `println!` write formatted strings (using the `format!`
9332 extension) to stdout.
9333 * `write!` and `writeln!` write formatted strings (using the `format!`
9334 extension) to the new Writers in `std::rt::io`.
9335 * The library section in which a function or static is placed may
9336 be specified with `#[link_section = "..."]`.
9337 * The `proto!` syntax extension for defining bounded message protocols
9339 * `macro_rules!` is hygienic for `let` declarations.
9340 * The `#[export_name]` attribute specifies the name of a symbol.
9341 * `unreachable!` can be used to indicate unreachable code, and fails
9345 * std: Transitioned to the new runtime, written in Rust.
9346 * std: Added an experimental I/O library, `rt::io`, based on the new
9348 * std: A new generic `range` function was added to the prelude, replacing
9349 `uint::range` and friends.
9350 * std: `range_rev` no longer exists. Since range is an iterator it can be
9351 reversed with `range(lo, hi).invert()`.
9352 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9353 renamed to `unwrap_or`.
9354 * std: The `iterator` module was renamed to `iter`.
9355 * std: Integral types now support the `checked_add`, `checked_sub`, and
9356 `checked_mul` operations for detecting overflow.
9357 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9359 * std: Methods are standardizing on conventions for casting methods:
9360 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9362 * std: The `CString` type in `c_str` provides new ways to convert to and
9364 * std: `DoubleEndedIterator` can yield elements in two directions.
9365 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9367 * std: `str::from_bytes` renamed to `str::from_utf8`.
9368 * std: `pop_opt` and `shift_opt` methods added to vectors.
9369 * std: The task-local data interface no longer uses @, and keys are
9370 no longer function pointers.
9371 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9372 * std: Added `SharedPort` to `comm`.
9373 * std: `Eq` has a default method for `ne`; only `eq` is required
9375 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9376 is required in implementations.
9377 * std: `is_utf8` performance is improved, impacting many string functions.
9378 * std: `os::MemoryMap` provides cross-platform mmap.
9379 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9380 are not 'in-bounds' are considered undefined.
9381 * std: Many freestanding functions in `vec` removed in favor of methods.
9382 * std: Many freestanding functions on scalar types removed in favor of
9384 * std: Many options to task builders were removed since they don't make
9385 sense in the new scheduler design.
9386 * std: More containers implement `FromIterator` so can be created by the
9388 * std: More complete atomic types in `unstable::atomics`.
9389 * std: `comm::PortSet` removed.
9390 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9391 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9392 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9393 default implementations.
9394 * std: Various `from_str` functions were removed in favor of a generic
9395 `from_str` which is available in the prelude.
9396 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9397 * extra: `dlist`, the doubly-linked list was modernized.
9398 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9399 * extra: Added `glob` module, replacing `std::os::glob`.
9400 * extra: `rope` was removed.
9401 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9402 * extra: `net`, and `timer` were removed. The experimental replacements
9403 are `std::rt::io::net` and `std::rt::io::timer`.
9404 * extra: Iterators implemented for `SmallIntMap`.
9405 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9406 * extra: `SmallIntSet` removed. Use `BitvSet`.
9407 * extra: Performance of JSON parsing greatly improved.
9408 * extra: `semver` updated to SemVer 2.0.0.
9409 * extra: `term` handles more terminals correctly.
9410 * extra: `dbg` module removed.
9411 * extra: `par` module removed.
9412 * extra: `future` was cleaned up, with some method renames.
9413 * extra: Most free functions in `getopts` were converted to methods.
9416 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9417 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9418 similarly to gcc's `--march` flag.
9419 * rustc's performance compiling small crates is much better.
9420 * rustpkg has received many improvements.
9421 * rustpkg supports git tags as package IDs.
9422 * rustpkg builds into target-specific directories so it can be used for
9424 * The number of concurrent test tasks is controlled by the environment
9425 variable RUST_TEST_TASKS.
9426 * The test harness can now report metrics for benchmarks.
9427 * All tools have man pages.
9428 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9429 * The runtime uses jemalloc for allocations.
9430 * Segmented stacks are temporarily disabled as part of the transition to
9431 the new runtime. Stack overflows are possible!
9432 * A new documentation backend, rustdoc_ng, is available for use. It is
9433 still invoked through the normal `rustdoc` command.
9436 Version 0.7 (2013-07-03)
9437 =======================
9439 * ~2000 changes, numerous bugfixes
9442 * `impl`s no longer accept a visibility qualifier. Put them on methods
9444 * The borrow checker has been rewritten with flow-sensitivity, fixing
9445 many bugs and inconveniences.
9446 * The `self` parameter no longer implicitly means `&'self self`,
9447 and can be explicitly marked with a lifetime.
9448 * Overloadable compound operators (`+=`, etc.) have been temporarily
9449 removed due to bugs.
9450 * The `for` loop protocol now requires `for`-iterators to return `bool`
9451 so they compose better.
9452 * The `Durable` trait is replaced with the `'static` bounds.
9453 * Trait default methods work more often.
9454 * Structs with the `#[packed]` attribute have byte alignment and
9455 no padding between fields.
9456 * Type parameters bound by `Copy` must now be copied explicitly with
9458 * It is now illegal to move out of a dereferenced unsafe pointer.
9459 * `Option<~T>` is now represented as a nullable pointer.
9460 * `@mut` does dynamic borrow checks correctly.
9461 * The `main` function is only detected at the topmost level of the crate.
9462 The `#[main]` attribute is still valid anywhere.
9463 * Struct fields may no longer be mutable. Use inherited mutability.
9464 * The `#[no_send]` attribute makes a type that would otherwise be
9466 * The `#[no_freeze]` attribute makes a type that would otherwise be
9468 * Unbounded recursion will abort the process after reaching the limit
9469 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9470 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9471 are never implicitly copyable.
9472 * `#[static_assert]` makes compile-time assertions about static bools.
9473 * At long last, 'argument modes' no longer exist.
9474 * The rarely used `use mod` statement no longer exists.
9477 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9479 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9480 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9482 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9483 and unsuffixed integer literals.
9486 * The `core` crate was renamed to `std`.
9487 * The `std` crate was renamed to `extra`.
9488 * More and improved documentation.
9489 * std: `iterator` module for external iterator objects.
9490 * Many old-style (internal, higher-order function) iterators replaced by
9491 implementations of `Iterator`.
9492 * std: Many old internal vector and string iterators,
9493 incl. `any`, `all`. removed.
9494 * std: The `finalize` method of `Drop` renamed to `drop`.
9495 * std: The `drop` method now takes `&mut self` instead of `&self`.
9496 * std: The prelude no longer re-exports any modules, only types and traits.
9497 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9498 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9499 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9500 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9501 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9502 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9503 * std: Many types implement `Clone`.
9504 * std: `path` type renamed to `Path`.
9505 * std: `mut` module and `Mut` type removed.
9506 * std: Many standalone functions removed in favor of methods and iterators
9507 in `vec`, `str`. In the future methods will also work as functions.
9508 * std: `reinterpret_cast` removed. Use `transmute`.
9509 * std: ascii string handling in `std::ascii`.
9510 * std: `Rand` is implemented for ~/@.
9511 * std: `run` module for spawning processes overhauled.
9512 * std: Various atomic types added to `unstable::atomic`.
9513 * std: Various types implement `Zero`.
9514 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9515 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9516 * std: Added `os::mkdir_recursive`.
9517 * std: Added `os::glob` function performs filesystems globs.
9518 * std: `FuzzyEq` renamed to `ApproxEq`.
9519 * std: `Map` now defines `pop` and `swap` methods.
9520 * std: `Cell` constructors converted to static methods.
9521 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9522 * extra: `flate` module moved from `std` to `extra`.
9523 * extra: `fileinput` module for iterating over a series of files.
9524 * extra: `Complex` number type and `complex` module.
9525 * extra: `Rational` number type and `rational` module.
9526 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9527 * extra: `term` uses terminfo now, is more correct.
9528 * extra: `arc` functions converted to methods.
9529 * extra: Implementation of fixed output size variations of SHA-2.
9532 * `unused_variables` lint mode for unused variables (default: warn).
9533 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9535 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9537 * `dead_assignment` lint mode for unread variables (default: warn).
9538 * `unnecessary_allocation` lint mode detects some heap allocations that are
9539 immediately borrowed so could be written without allocating (default: warn).
9540 * `missing_doc` lint mode (default: allow).
9541 * `unreachable_code` lint mode (default: warn).
9542 * The `rusti` command has been rewritten and a number of bugs addressed.
9543 * rustc outputs in color on more terminals.
9544 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9545 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9546 * Compiling with `-g` will make the binary record information about
9547 dynamic borrowcheck failures for debugging.
9548 * rustdoc has a nicer stylesheet.
9549 * Various improvements to rustdoc.
9550 * Improvements to rustpkg (see the detailed release notes).
9553 Version 0.6 (2013-04-03)
9554 ========================
9556 * ~2100 changes, numerous bugfixes
9559 * The self type parameter in traits is now spelled `Self`
9560 * The `self` parameter in trait and impl methods must now be explicitly
9561 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9562 * Static methods no longer require the `static` keyword and instead
9563 are distinguished by the lack of a `self` parameter
9564 * Replaced the `Durable` trait with the `'static` lifetime
9565 * The old closure type syntax with the trailing sigil has been
9566 removed in favor of the more consistent leading sigil
9567 * `super` is a keyword, and may be prefixed to paths
9568 * Trait bounds are separated with `+` instead of whitespace
9569 * Traits are implemented with `impl Trait for Type`
9570 instead of `impl Type: Trait`
9571 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9572 * The `export` keyword has finally been removed
9573 * The `move` keyword has been removed (see "Semantic changes")
9574 * The interior mutability qualifier on vectors, `[mut T]`, has been
9575 removed. Use `&mut [T]`, etc.
9576 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9577 * `fail` is no longer a keyword. Use `fail!()`
9578 * `assert` is no longer a keyword. Use `assert!()`
9579 * `log` is no longer a keyword. use `debug!`, etc.
9580 * 1-tuples may be represented as `(T,)`
9581 * Struct fields may no longer be `mut`. Use inherited mutability,
9582 `@mut T`, `core::mut` or `core::cell`
9583 * `extern mod { ... }` is no longer valid syntax for foreign
9584 function modules. Use extern blocks: `extern { ... }`
9585 * Newtype enums removed. Use tuple-structs.
9586 * Trait implementations no longer support visibility modifiers
9587 * Pattern matching over vectors improved and expanded
9588 * `const` renamed to `static` to correspond to lifetime name,
9589 and make room for future `static mut` unsafe mutable globals.
9590 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9591 * `Clone` implementations can be automatically generated with
9592 `#[deriving(Clone)]`
9593 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9594 instead of `foo as Bar`.
9595 * Fixed length vector types are now written as `[int, .. 3]`
9596 instead of `[int * 3]`.
9597 * Fixed length vector types can express the length as a constant
9598 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9601 * Types with owned pointers or custom destructors move by default,
9602 eliminating the `move` keyword
9603 * All foreign functions are considered unsafe
9604 * &mut is now unaliasable
9605 * Writes to borrowed @mut pointers are prevented dynamically
9607 * The name of the main function can be customized using #[main]
9608 * The default type of an inferred closure is &fn instead of @fn
9609 * `use` statements may no longer be "chained" - they cannot import
9610 identifiers imported by previous `use` statements
9611 * `use` statements are crate relative, importing from the "top"
9612 of the crate by default. Paths may be prefixed with `super::`
9613 or `self::` to change the search behavior.
9614 * Method visibility is inherited from the implementation declaration
9615 * Structural records have been removed
9616 * Many more types can be used in static items, including enums
9617 'static-lifetime pointers and vectors
9618 * Pattern matching over vectors improved and expanded
9619 * Typechecking of closure types has been overhauled to
9620 improve inference and eliminate unsoundness
9621 * Macros leave scope at the end of modules, unless that module is
9622 tagged with #[macro_escape]
9625 * Added big integers to `std::bigint`
9626 * Removed `core::oldcomm` module
9627 * Added pipe-based `core::comm` module
9628 * Numeric traits have been reorganized under `core::num`
9629 * `vec::slice` finally returns a slice
9630 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9631 * Containers reorganized around traits in `core::container`
9632 * `core::dvec` removed, `~[T]` is a drop-in replacement
9633 * `core::send_map` renamed to `core::hashmap`
9634 * `std::map` removed; replaced with `core::hashmap`
9635 * `std::treemap` reimplemented as an owned balanced tree
9636 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9637 * `core::trie` added as a fast ordered map for integer keys
9638 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9639 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9640 overload the comparison operators, whereas `TotalOrd` is used
9641 by certain container types
9644 * Replaced the 'cargo' package manager with 'rustpkg'
9645 * Added all-purpose 'rust' tool
9646 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9647 * rustc now *attempts* to offer spelling suggestions
9648 * Improved support for ARM and Android
9649 * Preliminary MIPS backend
9650 * Improved foreign function ABI implementation for x86, x86_64
9651 * Various memory usage improvements
9652 * Rust code may be embedded in foreign code under limited circumstances
9653 * Inline assembler supported by new asm!() syntax extension.
9656 Version 0.5 (2012-12-21)
9657 ===========================
9659 * ~900 changes, numerous bugfixes
9662 * Removed `<-` move operator
9663 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9664 * Removed old fixed length vector syntax - `[T]/N`
9665 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9666 * Macros may now expand to items and statements
9667 * `a.b()` is always parsed as a method call, never as a field projection
9668 * `Eq` and `IterBytes` implementations can be automatically generated
9669 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9670 * Removed the special crate language for `.rc` files
9671 * Function arguments may consist of any irrefutable pattern
9674 * `&` and `~` pointers may point to objects
9675 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9676 * Enum variants may be structs
9677 * Destructors can be added to all nominal types with the Drop trait
9678 * Structs and nullary enum variants may be constants
9679 * Values that cannot be implicitly copied are now automatically moved
9680 without writing `move` explicitly
9681 * `&T` may now be coerced to `*T`
9682 * Coercions happen in `let` statements as well as function calls
9683 * `use` statements now take crate-relative paths
9684 * The module and type namespaces have been merged so that static
9685 method names can be resolved under the trait in which they are
9688 * Improved support for language features
9689 * Trait inheritance works in many scenarios
9690 * More support for explicit self arguments in methods - `self`, `&self`
9691 `@self`, and `~self` all generally work as expected
9692 * Static methods work in more situations
9693 * Experimental: Traits may declare default methods for the implementations
9697 * New condition handling system in `core::condition`
9698 * Timsort added to `std::sort`
9699 * New priority queue, `std::priority_queue`
9700 * Pipes for serializable types, `std::flatpipes'
9701 * Serialization overhauled to be trait-based
9702 * Expanded `getopts` definitions
9703 * Moved futures to `std`
9704 * More functions are pure now
9705 * `core::comm` renamed to `oldcomm`. Still deprecated
9706 * `rustdoc` and `cargo` are libraries now
9709 * Added a preliminary REPL, `rusti`
9710 * License changed from MIT to dual MIT/APL2
9713 Version 0.4 (2012-10-15)
9714 ==========================
9716 * ~2000 changes, numerous bugfixes
9719 * All keywords are now strict and may not be used as identifiers anywhere
9720 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9721 'of', 'with', 'to', 'class'.
9722 * Classes are replaced with simpler structs
9723 * Explicit method self types
9724 * `ret` became `return` and `alt` became `match`
9725 * `import` is now `use`; `use is now `extern mod`
9726 * `extern mod { ... }` is now `extern { ... }`
9727 * `use mod` is the recommended way to import modules
9728 * `pub` and `priv` replace deprecated export lists
9729 * The syntax of `match` pattern arms now uses fat arrow (=>)
9730 * `main` no longer accepts an args vector; use `os::args` instead
9733 * Trait implementations are now coherent, ala Haskell typeclasses
9734 * Trait methods may be static
9735 * Argument modes are deprecated
9736 * Borrowed pointers are much more mature and recommended for use
9737 * Strings and vectors in the static region are stored in constant memory
9738 * Typestate was removed
9739 * Resolution rewritten to be more reliable
9740 * Support for 'dual-mode' data structures (freezing and thawing)
9743 * Most binary operators can now be overloaded via the traits in
9745 * `std::net::url` for representing URLs
9746 * Sendable hash maps in `core::send_map`
9747 * `core::task' gained a (currently unsafe) task-local storage API
9750 * An efficient new intertask communication primitive called the pipe,
9751 along with a number of higher-level channel types, in `core::pipes`
9752 * `std::arc`, an atomically reference counted, immutable, shared memory
9754 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9755 * Futures are now based on pipes and sendable
9756 * More robust linked task failure
9757 * Improved task builder API
9760 * Improved error reporting
9761 * Preliminary JIT support
9762 * Preliminary work on precise GC
9763 * Extensive architectural improvements to rustc
9764 * Begun a transition away from buggy C++-based reflection (shape) code to
9765 Rust-based (visitor) code
9766 * All hash functions and tables converted to secure, randomized SipHash
9769 Version 0.3 (2012-07-12)
9770 ========================
9772 * ~1900 changes, numerous bugfixes
9774 * New coding conveniences
9775 * Integer-literal suffix inference
9776 * Per-item control over warnings, errors
9777 * #[cfg(windows)] and #[cfg(unix)] attributes
9778 * Documentation comments
9779 * More compact closure syntax
9780 * 'do' expressions for treating higher-order functions as
9782 * *-patterns (wildcard extended to all constructor fields)
9785 * Name resolution pass and exhaustiveness checker rewritten
9786 * Region pointers and borrow checking supersede alias
9788 * Init-ness checking is now provided by a region-based liveness
9789 pass instead of the typestate pass; same for last-use analysis
9790 * Extensive work on region pointers
9792 * Experimental new language features
9793 * Slices and fixed-size, interior-allocated vectors
9794 * #!-comments for lang versioning, shell execution
9795 * Destructors and iface implementation for classes;
9796 type-parameterized classes and class methods
9797 * 'const' type kind for types that can be used to implement
9798 shared-memory concurrency patterns
9802 * Removal of various obsolete features
9803 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9804 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9806 * Constructs: do-while loops ('do' repurposed), fn binding,
9807 resources (replaced by destructors)
9809 * Compiler reorganization
9810 * Syntax-layer of compiler split into separate crate
9811 * Clang (from LLVM project) integrated into build
9812 * Typechecker split into sub-modules
9815 * New time functions
9816 * Extension methods for many built-in types
9817 * Arc: atomic-refcount read-only / exclusive-use shared cells
9818 * Par: parallel map and search routines
9819 * Extensive work on libuv interface
9820 * Much vector code moved to libraries
9821 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9822 #include, #include_str, #include_bin
9825 * Cargo automatically resolves dependencies
9828 Version 0.2 (2012-03-29)
9829 =========================
9831 * >1500 changes, numerous bugfixes
9833 * New docs and doc tooling
9835 * New port: FreeBSD x86_64
9837 * Compilation model enhancements
9838 * Generics now specialized, multiply instantiated
9839 * Functions now inlined across separate crates
9841 * Scheduling, stack and threading fixes
9842 * Noticeably improved message-passing performance
9843 * Explicit schedulers
9847 * Experimental new language features
9848 * Operator overloading
9852 * Various language extensions
9853 * C-callback function types: 'crust fn ...'
9854 * Infinite-loop construct: 'loop { ... }'
9855 * Shorten 'mutable' to 'mut'
9856 * Required mutable-local qualifier: 'let mut ...'
9857 * Basic glob-exporting: 'export foo::*;'
9858 * Alt now exhaustive, 'alt check' for runtime-checked
9859 * Block-function form of 'for' loop, with 'break' and 'ret'.
9862 * AST quasi-quote syntax extension
9863 * Revived libuv interface
9864 * New modules: core::{future, iter}, std::arena
9865 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9866 * Extensive cleanup, regularization in libstd, libcore
9869 Version 0.1 (2012-01-20)
9870 ===============================
9872 * Most language features work, including:
9873 * Unique pointers, unique closures, move semantics
9874 * Interface-constrained generics
9875 * Static interface dispatch
9877 * Multithread task scheduling
9878 * Typestate predicates
9879 * Failure unwinding, destructors
9880 * Pattern matching and destructuring assignment
9881 * Lightweight block-lambda syntax
9882 * Preliminary macro-by-example
9884 * Compiler works with the following configurations:
9885 * Linux: x86 and x86_64 hosts and targets
9886 * macOS: x86 and x86_64 hosts and targets
9887 * Windows: x86 hosts and targets
9889 * Cross compilation / multi-target configuration supported.
9891 * Preliminary API-documentation and package-management tools included.
9895 * Documentation is incomplete.
9897 * Performance is below intended target.
9899 * Standard library APIs are subject to extensive change, reorganization.
9901 * Language-level versioning is not yet operational - future code will