1 Version 1.50.0 (2021-02-11)
2 ============================
5 -----------------------
6 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
7 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
8 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
11 -----------------------
12 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
13 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
14 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
15 - [Dropped support for all cloudabi targets.][78439]
17 \* Refer to Rust's [platform support page][forge-platform-support] for more
18 information on Rust's tiered platform support.
21 -----------------------
23 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
24 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
25 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
26 This value cannot be a valid file descriptor, and now means `Option<File>` takes
27 up the same amount of space as `File`.
33 - [`btree_map::Entry::or_insert_with_key`]
36 - [`hash_map::Entry::or_insert_with_key`]
40 - [`UnsafeCell::get_mut`]
42 The following previously stable methods are now `const`.
46 - [`IpAddr::is_unspecified`]
47 - [`IpAddr::is_loopback`]
48 - [`IpAddr::is_multicast`]
49 - [`Ipv4Addr::octets`]
50 - [`Ipv4Addr::is_loopback`]
51 - [`Ipv4Addr::is_private`]
52 - [`Ipv4Addr::is_link_local`]
53 - [`Ipv4Addr::is_multicast`]
54 - [`Ipv4Addr::is_broadcast`]
55 - [`Ipv4Addr::is_documentation`]
56 - [`Ipv4Addr::to_ipv6_compatible`]
57 - [`Ipv4Addr::to_ipv6_mapped`]
58 - [`Ipv6Addr::segments`]
59 - [`Ipv6Addr::is_unspecified`]
60 - [`Ipv6Addr::is_loopback`]
61 - [`Ipv6Addr::is_multicast`]
62 - [`Ipv6Addr::to_ipv4`]
65 - [`Layout::from_size_align`]
66 - `pow` for all integer types.
67 - `checked_pow` for all integer types.
68 - `saturating_pow` for all integer types.
69 - `wrapping_pow` for all integer types.
70 - `next_power_of_two` for all unsigned integer types.
71 - `checked_power_of_two` for all unsigned integer types.
74 -----------------------
76 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
77 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
78 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
79 contents of that directory for changes.][cargo/8973]
80 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
85 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
86 - [Running tests will now print the total time taken to execute.][75752]
91 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
92 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
93 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
94 unhygenic `macro_rules!` macros.][79472]
95 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
96 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
97 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
98 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
99 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
100 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
102 [74989]: https://github.com/rust-lang/rust/pull/74989
103 [79261]: https://github.com/rust-lang/rust/pull/79261
104 [79896]: https://github.com/rust-lang/rust/pull/79896
105 [79484]: https://github.com/rust-lang/rust/pull/79484
106 [79472]: https://github.com/rust-lang/rust/pull/79472
107 [79270]: https://github.com/rust-lang/rust/pull/79270
108 [79003]: https://github.com/rust-lang/rust/pull/79003
109 [78864]: https://github.com/rust-lang/rust/pull/78864
110 [78636]: https://github.com/rust-lang/rust/pull/78636
111 [78439]: https://github.com/rust-lang/rust/pull/78439
112 [78343]: https://github.com/rust-lang/rust/pull/78343
113 [78296]: https://github.com/rust-lang/rust/pull/78296
114 [78068]: https://github.com/rust-lang/rust/pull/78068
115 [75752]: https://github.com/rust-lang/rust/pull/75752
116 [74699]: https://github.com/rust-lang/rust/pull/74699
117 [78142]: https://github.com/rust-lang/rust/pull/78142
118 [77484]: https://github.com/rust-lang/rust/pull/77484
119 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
120 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
121 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
122 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
123 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
124 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
125 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
126 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
127 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
128 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
129 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
130 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
131 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
132 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
133 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
134 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
135 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
136 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
137 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
138 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
139 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
140 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
141 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
142 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
143 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
144 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
145 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
146 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
147 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
148 [`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
149 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
150 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
151 [`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
152 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
155 Version 1.49.0 (2020-12-31)
156 ============================
159 -----------------------
161 - [Unions can now implement `Drop`, and you can now have a field in a union
162 with `ManuallyDrop<T>`.][77547]
163 - [You can now cast uninhabited enums to integers.][76199]
164 - [You can now bind by reference and by move in patterns.][76119] This
165 allows you to selectively borrow individual components of a type. E.g.
173 let person = Person {
174 name: String::from("Alice"),
178 // `name` is moved out of person, but `age` is referenced.
179 let Person { name, ref age } = person;
180 println!("{} {}", name, age);
184 -----------------------
186 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
187 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
188 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
189 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
190 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
191 - [Output from threads spawned in tests is now captured.][78227]
192 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
194 \* Refer to Rust's [platform support page][forge-platform-support] for more
195 information on Rust's tiered platform support.
198 -----------------------
200 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
201 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
206 - [`slice::select_nth_unstable`]
207 - [`slice::select_nth_unstable_by`]
208 - [`slice::select_nth_unstable_by_key`]
210 The following previously stable methods are now `const`.
213 - [`Poll::is_pending`]
216 -----------------------
217 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
218 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
219 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
220 variable will be set if the crate being built is one the user selected to build, either
221 with `-p` or through defaults.
222 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
228 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
229 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
230 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
231 Previously such invalid or unused attributes could be ignored.
232 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
233 read [this post about the changes][rustdoc-ws-post] for more details.
234 - [Trait bounds are no longer inferred for associated types.][79904]
238 These changes provide no direct user facing benefits, but represent significant
239 improvements to the internals and overall performance of rustc and
242 - [rustc's internal crates are now compiled using the `initial-exec` Thread
243 Local Storage model.][78201]
244 - [Calculate visibilities once in resolve.][78077]
245 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
246 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
249 [75991]: https://github.com/rust-lang/rust/pull/75991
250 [78951]: https://github.com/rust-lang/rust/pull/78951
251 [78848]: https://github.com/rust-lang/rust/pull/78848
252 [78746]: https://github.com/rust-lang/rust/pull/78746
253 [78376]: https://github.com/rust-lang/rust/pull/78376
254 [78228]: https://github.com/rust-lang/rust/pull/78228
255 [78227]: https://github.com/rust-lang/rust/pull/78227
256 [78201]: https://github.com/rust-lang/rust/pull/78201
257 [78109]: https://github.com/rust-lang/rust/pull/78109
258 [78077]: https://github.com/rust-lang/rust/pull/78077
259 [77997]: https://github.com/rust-lang/rust/pull/77997
260 [77703]: https://github.com/rust-lang/rust/pull/77703
261 [77547]: https://github.com/rust-lang/rust/pull/77547
262 [77015]: https://github.com/rust-lang/rust/pull/77015
263 [76199]: https://github.com/rust-lang/rust/pull/76199
264 [76119]: https://github.com/rust-lang/rust/pull/76119
265 [75914]: https://github.com/rust-lang/rust/pull/75914
266 [79004]: https://github.com/rust-lang/rust/pull/79004
267 [78676]: https://github.com/rust-lang/rust/pull/78676
268 [79904]: https://github.com/rust-lang/rust/issues/79904
269 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
270 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
271 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
272 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
273 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
274 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
275 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
276 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
277 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
278 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
279 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
281 Version 1.48.0 (2020-11-19)
282 ==========================
287 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
288 is still rejected *semantically*, but can now be parsed by procedural macros.
292 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
293 `rustc` whether to link its own C runtime and libraries or to rely on a external
294 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
295 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
296 Note: If you're using cargo you must explicitly pass the `--target` flag.
297 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
299 \* Refer to Rust's [platform support page][forge-platform-support] for more
300 information on Rust's tiered platform support.
304 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
305 and `&Stderr`.][76275]
306 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
307 - [The `matches!` macro now supports having a trailing comma.][74880]
308 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
309 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
313 - [`slice::as_ptr_range`]
314 - [`slice::as_mut_ptr_range`]
315 - [`VecDeque::make_contiguous`]
316 - [`future::pending`]
319 The following previously stable methods are now `const fn`'s:
321 - [`Option::is_some`]
322 - [`Option::is_none`]
327 - [`Ordering::reverse`]
335 - [You can now link to items in `rustdoc` using the intra-doc link
336 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
337 a link to `std::future`'s documentation. See ["Linking to items by
338 name"][intradoc-links] for more information.
339 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
340 when searching through `rustdoc`'s UI.][75740]
344 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
345 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
346 promoted to `'static` lifetime any more inside `const fn`s.
347 - [Associated type bindings on trait objects are now verified to meet the bounds
348 declared on the trait when checking that they implement the trait.][27675]
349 - [When trait bounds on associated types or opaque types are ambiguous, the
350 compiler no longer makes an arbitrary choice on which bound to use.][54121]
351 - [Fixed recursive nonterminals not being expanded in macros during
352 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
353 correctly handling recursive nonterminal tokens.
354 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
355 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
356 in places where they have no effect.][73461]
357 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
358 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
359 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
360 disallow zero-initialization.][71274]
361 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
362 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
363 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
364 see the [`catch_unwind`] documentation for further information.
370 These changes provide no direct user facing benefits, but represent significant
371 improvements to the internals and overall performance of rustc and
374 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
375 You can continue building with `make` by setting `ninja=false` in
377 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
378 - [Made `ensure_sufficient_stack()` non-generic][76680]
380 [78143]: https://github.com/rust-lang/rust/issues/78143
381 [76680]: https://github.com/rust-lang/rust/pull/76680/
382 [76030]: https://github.com/rust-lang/rust/pull/76030/
383 [70212]: https://github.com/rust-lang/rust/pull/70212/
384 [27675]: https://github.com/rust-lang/rust/issues/27675/
385 [54121]: https://github.com/rust-lang/rust/issues/54121/
386 [71274]: https://github.com/rust-lang/rust/pull/71274/
387 [77386]: https://github.com/rust-lang/rust/pull/77386/
388 [77153]: https://github.com/rust-lang/rust/pull/77153/
389 [77055]: https://github.com/rust-lang/rust/pull/77055/
390 [76275]: https://github.com/rust-lang/rust/pull/76275/
391 [76310]: https://github.com/rust-lang/rust/pull/76310/
392 [76420]: https://github.com/rust-lang/rust/pull/76420/
393 [76158]: https://github.com/rust-lang/rust/pull/76158/
394 [75857]: https://github.com/rust-lang/rust/pull/75857/
395 [75585]: https://github.com/rust-lang/rust/pull/75585/
396 [75740]: https://github.com/rust-lang/rust/pull/75740/
397 [75502]: https://github.com/rust-lang/rust/pull/75502/
398 [74880]: https://github.com/rust-lang/rust/pull/74880/
399 [74922]: https://github.com/rust-lang/rust/pull/74922/
400 [74430]: https://github.com/rust-lang/rust/pull/74430/
401 [74194]: https://github.com/rust-lang/rust/pull/74194/
402 [73461]: https://github.com/rust-lang/rust/pull/73461/
403 [73166]: https://github.com/rust-lang/rust/pull/73166/
404 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
405 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
406 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
407 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
408 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
409 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
410 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
411 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
412 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
413 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
414 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
415 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
416 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
417 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
418 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
421 Version 1.47.0 (2020-10-08)
422 ==========================
426 - [Closures will now warn when not used.][74869]
430 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
431 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
433 - [Upgraded to LLVM 11.][73526]
434 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
435 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
436 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
438 \* Refer to Rust's [platform support page][forge-platform-support] for more
439 information on Rust's tiered platform support.
443 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
444 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
445 those of length less than 33.][74060]
446 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
447 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
448 `PartialEq`, and `PartialOrd`.][73583]
453 - [`Range::is_empty`]
454 - [`RangeInclusive::is_empty`]
455 - [`Result::as_deref`]
456 - [`Result::as_deref_mut`]
458 - [`pointer::offset_from`]
462 The following previously stable APIs have now been made const.
464 - [The `new` method for all `NonZero` integers.][73858]
465 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
466 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
467 methods for all integers.][73858]
468 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
469 signed integers.][73858]
470 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
471 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
472 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
473 `is_ascii_control` methods for `char` and `u8`.][73858]
477 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
478 You can override this by setting the following in your `Cargo.toml`.
480 [profile.release.build-override]
483 - [`cargo-help` will now display man pages for commands rather just the
484 `--help` text.][cargo/8456]
485 - [`cargo-metadata` now emits a `test` field indicating if a target has
486 tests enabled.][cargo/8478]
487 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
488 - [`cargo-publish` will now use an alternative registry by default if it's the
489 only registry specified in `package.publish`.][cargo/8571]
493 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
494 type based search.][75366]
495 - [Added the Ayu theme to rustdoc.][71237]
499 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
500 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
501 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
502 help to preserve more span information.][73084] These changes may cause
503 compiliation errors if your macro was unhygenic or didn't correctly handle
505 - [Moved support for the CloudABI target to tier 3.][75568]
506 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
507 - [Added the `rustc-docs` component.][75560] This allows you to install
508 and read the documentation for the compiler internal APIs. (Currently only
509 available for `x86_64-unknown-linux-gnu`.)
514 - [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.
516 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
517 [75048]: https://github.com/rust-lang/rust/pull/75048/
518 [74163]: https://github.com/rust-lang/rust/pull/74163/
519 [71237]: https://github.com/rust-lang/rust/pull/71237/
520 [74869]: https://github.com/rust-lang/rust/pull/74869/
521 [73858]: https://github.com/rust-lang/rust/pull/73858/
522 [75716]: https://github.com/rust-lang/rust/pull/75716/
523 [75908]: https://github.com/rust-lang/rust/pull/75908/
524 [75516]: https://github.com/rust-lang/rust/pull/75516/
525 [75560]: https://github.com/rust-lang/rust/pull/75560/
526 [75568]: https://github.com/rust-lang/rust/pull/75568/
527 [75366]: https://github.com/rust-lang/rust/pull/75366/
528 [75204]: https://github.com/rust-lang/rust/pull/75204/
529 [74650]: https://github.com/rust-lang/rust/pull/74650/
530 [74419]: https://github.com/rust-lang/rust/pull/74419/
531 [73964]: https://github.com/rust-lang/rust/pull/73964/
532 [74021]: https://github.com/rust-lang/rust/pull/74021/
533 [74060]: https://github.com/rust-lang/rust/pull/74060/
534 [73893]: https://github.com/rust-lang/rust/pull/73893/
535 [73526]: https://github.com/rust-lang/rust/pull/73526/
536 [73583]: https://github.com/rust-lang/rust/pull/73583/
537 [73084]: https://github.com/rust-lang/rust/pull/73084/
538 [73197]: https://github.com/rust-lang/rust/pull/73197/
539 [72488]: https://github.com/rust-lang/rust/pull/72488/
540 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
541 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
542 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
543 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
544 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
545 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
546 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
547 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
548 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
549 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
550 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
551 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
552 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
553 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
554 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
557 Version 1.46.0 (2020-08-27)
558 ==========================
562 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
563 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
564 const functions.][73862]
565 - [The `#[track_caller]` attribute can now be added to functions to use the
566 function's caller's location information for panic messages.][72445]
567 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
568 `x.0.0` over `(x.0).0`.
569 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
570 You currently can't use `mem::transmute` in constant functions.
574 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
575 - [Enabled static "Position Independent Executables" by default
576 for `x86_64-unknown-linux-musl`.][70740]
580 - [`mem::forget` is now a `const fn`.][73887]
581 - [`String` now implements `From<char>`.][73466]
582 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
583 integer types.][73032]
584 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
585 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
586 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
587 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
588 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
589 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
594 - [`vec::Drain::as_slice`]
598 Added a number of new environment variables that are now available when
599 compiling your crate.
601 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
602 the specific binary being compiled and the name of the crate.
603 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
604 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
608 - [The target configuration option `abi_blacklist` has been renamed
609 to `unsupported_abis`.][74150] The old name will still continue to work.
610 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
611 This was previously accepted but will become a hard error in a future release.
612 - [Rustc will fail to compile if you have a struct with
613 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
615 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
616 ensure that spans have the correct information, and may cause breakage if you
617 were relying on receiving spans with dummy information.
618 - [The InnoSetup installer for Windows is no longer available.][72569] This was
619 a legacy installer that was replaced by a MSI installer a few years ago but
620 was still being built.
621 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
622 - [Rustc will no longer accept overlapping trait implementations that only
623 differ in how the lifetime was bound.][72493]
624 - [Rustc now correctly relates the lifetime of an existential associated
625 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
626 you to pass a shorter lifetime than expected.
627 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
628 The library will need to be installed for `rustc` to work, even though we
629 expect it to be already available on most systems.
630 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
632 - [Pretty printing of some tokens in procedural macros changed.][75453] The
633 exact output returned by rustc's pretty printing is an unstable
634 implementation detail: we recommend any macro relying on it to switch to a
635 more robust parsing system.
637 [75453]: https://github.com/rust-lang/rust/issues/75453/
638 [74820]: https://github.com/rust-lang/rust/issues/74820/
639 [74420]: https://github.com/rust-lang/rust/issues/74420/
640 [74109]: https://github.com/rust-lang/rust/pull/74109/
641 [74150]: https://github.com/rust-lang/rust/pull/74150/
642 [73862]: https://github.com/rust-lang/rust/pull/73862/
643 [73887]: https://github.com/rust-lang/rust/pull/73887/
644 [73466]: https://github.com/rust-lang/rust/pull/73466/
645 [73516]: https://github.com/rust-lang/rust/pull/73516/
646 [73293]: https://github.com/rust-lang/rust/pull/73293/
647 [73007]: https://github.com/rust-lang/rust/pull/73007/
648 [73032]: https://github.com/rust-lang/rust/pull/73032/
649 [72920]: https://github.com/rust-lang/rust/pull/72920/
650 [72569]: https://github.com/rust-lang/rust/pull/72569/
651 [72583]: https://github.com/rust-lang/rust/pull/72583/
652 [72584]: https://github.com/rust-lang/rust/pull/72584/
653 [72717]: https://github.com/rust-lang/rust/pull/72717/
654 [72437]: https://github.com/rust-lang/rust/pull/72437/
655 [72445]: https://github.com/rust-lang/rust/pull/72445/
656 [72486]: https://github.com/rust-lang/rust/pull/72486/
657 [72493]: https://github.com/rust-lang/rust/pull/72493/
658 [72331]: https://github.com/rust-lang/rust/pull/72331/
659 [71896]: https://github.com/rust-lang/rust/pull/71896/
660 [71660]: https://github.com/rust-lang/rust/pull/71660/
661 [71322]: https://github.com/rust-lang/rust/pull/71322/
662 [70740]: https://github.com/rust-lang/rust/pull/70740/
663 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
664 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
665 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
666 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
667 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
670 Version 1.45.2 (2020-08-03)
671 ==========================
673 * [Fix bindings in tuple struct patterns][74954]
674 * [Fix track_caller integration with trait objects][74784]
676 [74954]: https://github.com/rust-lang/rust/issues/74954
677 [74784]: https://github.com/rust-lang/rust/issues/74784
680 Version 1.45.1 (2020-07-30)
681 ==========================
683 * [Fix const propagation with references.][73613]
684 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
685 * [Avoid spurious implicit region bound.][74509]
686 * [Install clippy on x.py install][74457]
688 [73613]: https://github.com/rust-lang/rust/pull/73613
689 [73078]: https://github.com/rust-lang/rust/issues/73078
690 [74509]: https://github.com/rust-lang/rust/pull/74509
691 [74457]: https://github.com/rust-lang/rust/pull/74457
694 Version 1.45.0 (2020-07-16)
695 ==========================
699 - [Out of range float to int conversions using `as` has been defined as a saturating
700 conversion.][71269] This was previously undefined behaviour, but you can use the
701 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
702 may be desirable in rare performance sensitive situations.
703 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
705 - [Function like procedural macros can now be used in expression, pattern, and statement
706 positions.][68717] This means you can now use a function-like procedural macro
707 anywhere you can use a declarative (`macro_rules!`) macro.
711 - [You can now override individual target features through the `target-feature`
712 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
713 equivalent to `-C target-feature=+avx2,+fma`.
714 - [Added the `force-unwind-tables` flag.][69984] This option allows
715 rustc to always generate unwind tables regardless of panic strategy.
716 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
717 to include LLVM bitcode into generated `rlib`s (this is on by default).
718 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
719 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
720 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
721 - [Upgraded to LLVM 10.][67759]
723 \* Refer to Rust's [platform support page][forge-platform-support] for more
724 information on Rust's tiered platform support.
729 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
731 - [`proc_macro::TokenStream` now implements `Default`.][72234]
732 - [You can now use `char` with
733 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
734 a range of codepoints.][72413] E.g.
735 you can now write the following;
737 for ch in 'a'..='z' {
741 // Prints "abcdefghijklmnopqrstuvwxyz"
743 - [`OsString` now implements `FromStr`.][71662]
744 - [The `saturating_neg` method has been added to all signed integer primitive
745 types, and the `saturating_abs` method has been added for all integer
746 primitive types.][71886]
747 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
748 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
750 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
751 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
752 integer types.][69813]
753 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
754 integer types.][72324]
755 - [The `fetch_update` method has been added to all atomic integer types.][71843]
760 - [`BTreeMap::remove_entry`]
762 - [`rc::Weak::as_ptr`]
763 - [`rc::Weak::from_raw`]
764 - [`rc::Weak::into_raw`]
765 - [`str::strip_prefix`]
766 - [`str::strip_suffix`]
767 - [`sync::Weak::as_ptr`]
768 - [`sync::Weak::from_raw`]
769 - [`sync::Weak::into_raw`]
770 - [`char::UNICODE_VERSION`]
771 - [`Span::resolved_at`]
772 - [`Span::located_at`]
773 - [`Span::mixed_site`]
774 - [`unix::process::CommandExt::arg0`]
779 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
784 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
785 `~~outdated information~~` becomes "~~outdated information~~".
786 - [Added an emoji to Rustdoc's deprecated API message.][72014]
790 - [Trying to self initialize a static value (that is creating a value using
791 itself) is unsound and now causes a compile error.][71140]
792 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
793 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
794 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
795 previously undocumented and not intended for public use. Rustdoc still provides
796 a non-zero exit code on errors.
797 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
798 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
799 flags while cargo is adding `embed-bitcode` itself. The recommended way to
800 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
801 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
805 - [Make clippy a git subtree instead of a git submodule][70655]
806 - [Unify the undo log of all snapshot types][69464]
808 [71848]: https://github.com/rust-lang/rust/issues/71848/
809 [73420]: https://github.com/rust-lang/rust/issues/73420/
810 [72324]: https://github.com/rust-lang/rust/pull/72324/
811 [71843]: https://github.com/rust-lang/rust/pull/71843/
812 [71886]: https://github.com/rust-lang/rust/pull/71886/
813 [72234]: https://github.com/rust-lang/rust/pull/72234/
814 [72239]: https://github.com/rust-lang/rust/pull/72239/
815 [72397]: https://github.com/rust-lang/rust/pull/72397/
816 [72413]: https://github.com/rust-lang/rust/pull/72413/
817 [72014]: https://github.com/rust-lang/rust/pull/72014/
818 [72062]: https://github.com/rust-lang/rust/pull/72062/
819 [72094]: https://github.com/rust-lang/rust/pull/72094/
820 [72133]: https://github.com/rust-lang/rust/pull/72133/
821 [67759]: https://github.com/rust-lang/rust/pull/67759/
822 [71900]: https://github.com/rust-lang/rust/pull/71900/
823 [71928]: https://github.com/rust-lang/rust/pull/71928/
824 [71662]: https://github.com/rust-lang/rust/pull/71662/
825 [71716]: https://github.com/rust-lang/rust/pull/71716/
826 [71447]: https://github.com/rust-lang/rust/pull/71447/
827 [71269]: https://github.com/rust-lang/rust/pull/71269/
828 [71095]: https://github.com/rust-lang/rust/pull/71095/
829 [71140]: https://github.com/rust-lang/rust/pull/71140/
830 [70655]: https://github.com/rust-lang/rust/pull/70655/
831 [70705]: https://github.com/rust-lang/rust/pull/70705/
832 [69984]: https://github.com/rust-lang/rust/pull/69984/
833 [69813]: https://github.com/rust-lang/rust/pull/69813/
834 [69464]: https://github.com/rust-lang/rust/pull/69464/
835 [68717]: https://github.com/rust-lang/rust/pull/68717/
836 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
837 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
838 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
839 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
840 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
841 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
842 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
843 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
844 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
845 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
846 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
847 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
848 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
849 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
850 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
851 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
852 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
855 Version 1.44.1 (2020-06-18)
856 ===========================
858 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
859 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
860 * [Fix crashes when finding backtrace on macOS.][71397]
861 * [Clippy applies lint levels into different files.][clippy/5356]
863 [71397]: https://github.com/rust-lang/rust/issues/71397
864 [73078]: https://github.com/rust-lang/rust/issues/73078
865 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
866 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
869 Version 1.44.0 (2020-06-04)
870 ==========================
874 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
875 - [Added the `unused_braces` lint.][70081]
877 **Syntax-only changes**
879 - [Expansion-driven outline module parsing][69838]
884 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
889 These are still rejected semantically, so you will likely receive an error but
890 these changes can be seen and parsed by macros and conditional compilation.
894 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
895 Additionally when in incremental mode rustc defaults to 256 codegen units.
896 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
897 a panic is thrown.][67502]
898 - [Added tier 3\* support for the `aarch64-unknown-none` and
899 `aarch64-unknown-none-softfloat` targets.][68334]
900 - [Added tier 3 support for `arm64-apple-tvos` and
901 `x86_64-apple-tvos` targets.][68191]
906 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
907 `vec![]` to be able to be used in `const` contexts.
908 - [`convert::Infallible` now implements `Hash`.][70281]
909 - [`OsString` now implements `DerefMut` and `IndexMut` returning
910 a `&mut OsStr`.][70048]
911 - [Unicode 13 is now supported.][69929]
912 - [`String` now implements `From<&mut str>`.][69661]
913 - [`IoSlice` now implements `Copy`.][69403]
914 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
915 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
916 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
917 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
918 integer types.][69373]
922 - [`PathBuf::with_capacity`]
923 - [`PathBuf::capacity`]
925 - [`PathBuf::reserve`]
926 - [`PathBuf::reserve_exact`]
927 - [`PathBuf::shrink_to_fit`]
928 - [`f32::to_int_unchecked`]
929 - [`f64::to_int_unchecked`]
930 - [`Layout::align_to`]
931 - [`Layout::pad_to_align`]
937 - [Added the `cargo tree` command which will print a tree graph of
938 your dependencies.][cargo/8062] E.g.
940 mdbook v0.3.2 (/Users/src/rust/mdbook)
942 │ ├── html5ever v0.24.0
944 │ │ │ └── cfg-if v0.1.9
946 │ │ └── markup5ever v0.9.0
947 │ │ ├── log v0.4.8 (*)
949 │ │ │ └── phf_shared v0.7.24
950 │ │ │ ├── siphasher v0.2.3
951 │ │ │ └── unicase v1.4.2
952 │ │ │ [build-dependencies]
953 │ │ │ └── version_check v0.1.5
956 You can also display dependencies on multiple versions of the same crate with
957 `cargo tree -d` (short for `cargo tree --duplicates`).
961 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
962 the version in the sidebar.][69494]
966 - [Rustc now correctly generates static libraries on Windows GNU targets with
967 the `.a` extension, rather than the previous `.lib`.][70937]
968 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
969 - [The `file_name` property in JSON output of macro errors now points the actual
970 source file rather than the previous format of `<NAME macros>`.][70969]
971 **Note:** this may not point to a file that actually exists on the user's system.
972 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
973 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
974 not allow zero initialization such as `NonZeroU8`.][66059] This was
975 previously a warning.
976 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
977 operator has been defined as a saturating operation.][71269] This was previously
978 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
979 continue using the current behaviour, which may be desirable in rare performance
980 sensitive situations.
984 These changes provide no direct user facing benefits, but represent significant
985 improvements to the internals and overall performance of rustc and
988 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
989 - [Replace big JS dict with JSON parsing.][71250]
991 [69373]: https://github.com/rust-lang/rust/pull/69373/
992 [66059]: https://github.com/rust-lang/rust/pull/66059/
993 [68191]: https://github.com/rust-lang/rust/pull/68191/
994 [68899]: https://github.com/rust-lang/rust/pull/68899/
995 [71147]: https://github.com/rust-lang/rust/pull/71147/
996 [71250]: https://github.com/rust-lang/rust/pull/71250/
997 [70937]: https://github.com/rust-lang/rust/pull/70937/
998 [70969]: https://github.com/rust-lang/rust/pull/70969/
999 [70632]: https://github.com/rust-lang/rust/pull/70632/
1000 [70281]: https://github.com/rust-lang/rust/pull/70281/
1001 [70345]: https://github.com/rust-lang/rust/pull/70345/
1002 [70048]: https://github.com/rust-lang/rust/pull/70048/
1003 [70081]: https://github.com/rust-lang/rust/pull/70081/
1004 [70156]: https://github.com/rust-lang/rust/pull/70156/
1005 [71269]: https://github.com/rust-lang/rust/pull/71269/
1006 [69838]: https://github.com/rust-lang/rust/pull/69838/
1007 [69929]: https://github.com/rust-lang/rust/pull/69929/
1008 [69661]: https://github.com/rust-lang/rust/pull/69661/
1009 [69778]: https://github.com/rust-lang/rust/pull/69778/
1010 [69494]: https://github.com/rust-lang/rust/pull/69494/
1011 [69403]: https://github.com/rust-lang/rust/pull/69403/
1012 [69033]: https://github.com/rust-lang/rust/pull/69033/
1013 [68692]: https://github.com/rust-lang/rust/pull/68692/
1014 [68334]: https://github.com/rust-lang/rust/pull/68334/
1015 [67502]: https://github.com/rust-lang/rust/pull/67502/
1016 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1017 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1018 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1019 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1020 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1021 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1022 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1023 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1024 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1025 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1026 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1027 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1028 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1031 Version 1.43.1 (2020-05-07)
1032 ===========================
1034 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1035 * [Fixed the stabilization of AVX-512 features.][71473]
1036 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1038 [71430]: https://github.com/rust-lang/rust/pull/71430
1039 [71473]: https://github.com/rust-lang/rust/issues/71473
1040 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1043 Version 1.43.0 (2020-04-23)
1044 ==========================
1048 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1049 the type inferred correctly.][68129]
1050 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1052 **Syntax only changes**
1053 - [Allow `type Foo: Ord` syntactically.][69361]
1054 - [Fuse associated and extern items up to defaultness.][69194]
1055 - [Syntactically allow `self` in all `fn` contexts.][68764]
1056 - [Merge `fn` syntax + cleanup item parsing.][68728]
1057 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1058 For example, you may now write:
1060 macro_rules! mac_trait {
1070 These are still rejected *semantically*, so you will likely receive an error but
1071 these changes can be seen and parsed by macros and
1072 conditional compilation.
1077 - [You can now pass multiple lint flags to rustc to override the previous
1078 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1079 everything in the `unused` lint group except `unused-variables` which
1080 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1081 everything in the `unused` lint group **including** `unused-variables` since
1082 the allow flag is specified before the deny flag (and therefore overridden).
1083 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1084 if they are available on `windows-gnu`.][67429]
1085 - [rustc now buffers errors/warnings printed in JSON.][69227]
1089 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1090 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1091 respectively.][69538] **Note** These conversions are only available when `N`
1093 - [You can now use associated constants on floats and integers directly, rather
1094 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1095 `f32::NAN` with no imports.
1096 - [`u8::is_ascii` is now `const`.][68984]
1097 - [`String` now implements `AsMut<str>`.][68742]
1098 - [Added the `primitive` module to `std` and `core`.][67637] This module
1099 reexports Rust's primitive types. This is mainly useful in macros
1100 where you want avoid these types being shadowed.
1101 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1102 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1106 - [`Once::is_completed`]
1111 - [`iter::once_with`]
1115 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1116 your environment.][cargo/7823]
1117 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1118 executable path when running integration tests or benchmarks.][cargo/7697]
1119 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1120 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1124 - [Certain checks in the `const_err` lint were deemed unrelated to const
1125 evaluation][69185], and have been moved to the `unconditional_panic` and
1126 `arithmetic_overflow` lints.
1131 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1132 has been a warning since 1.36.0.
1133 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1134 led to some instances being accepted, and now correctly emits a hard error.
1136 [69340]: https://github.com/rust-lang/rust/pull/69340
1140 These changes provide no direct user facing benefits, but represent significant
1141 improvements to the internals and overall performance of `rustc` and
1144 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1145 - [Improved how rustc generates drop code.][67332]
1146 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1147 - [traits: preallocate 2 Vecs of known initial size][69022]
1148 - [Avoid exponential behaviour when relating types][68772]
1149 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1150 - [Improve performance of coherence checks][68966]
1151 - [Deduplicate types in the generator witness][68672]
1152 - [Invert control in struct_lint_level.][68725]
1154 [67332]: https://github.com/rust-lang/rust/pull/67332/
1155 [67429]: https://github.com/rust-lang/rust/pull/67429/
1156 [67637]: https://github.com/rust-lang/rust/pull/67637/
1157 [67642]: https://github.com/rust-lang/rust/pull/67642/
1158 [67878]: https://github.com/rust-lang/rust/pull/67878/
1159 [67885]: https://github.com/rust-lang/rust/pull/67885/
1160 [68129]: https://github.com/rust-lang/rust/pull/68129/
1161 [68672]: https://github.com/rust-lang/rust/pull/68672/
1162 [68725]: https://github.com/rust-lang/rust/pull/68725/
1163 [68728]: https://github.com/rust-lang/rust/pull/68728/
1164 [68738]: https://github.com/rust-lang/rust/pull/68738/
1165 [68742]: https://github.com/rust-lang/rust/pull/68742/
1166 [68764]: https://github.com/rust-lang/rust/pull/68764/
1167 [68772]: https://github.com/rust-lang/rust/pull/68772/
1168 [68943]: https://github.com/rust-lang/rust/pull/68943/
1169 [68952]: https://github.com/rust-lang/rust/pull/68952/
1170 [68966]: https://github.com/rust-lang/rust/pull/68966/
1171 [68984]: https://github.com/rust-lang/rust/pull/68984/
1172 [69022]: https://github.com/rust-lang/rust/pull/69022/
1173 [69185]: https://github.com/rust-lang/rust/pull/69185/
1174 [69194]: https://github.com/rust-lang/rust/pull/69194/
1175 [69201]: https://github.com/rust-lang/rust/pull/69201/
1176 [69227]: https://github.com/rust-lang/rust/pull/69227/
1177 [69548]: https://github.com/rust-lang/rust/pull/69548/
1178 [69256]: https://github.com/rust-lang/rust/pull/69256/
1179 [69361]: https://github.com/rust-lang/rust/pull/69361/
1180 [69366]: https://github.com/rust-lang/rust/pull/69366/
1181 [69538]: https://github.com/rust-lang/rust/pull/69538/
1182 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1183 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1184 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1185 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1186 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1187 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1188 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1189 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1192 Version 1.42.0 (2020-03-12)
1193 ==========================
1197 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1199 fn foo(words: &[&str]) {
1201 ["Hello", "World", "!", ..] => println!("Hello World!"),
1202 ["Foo", "Bar", ..] => println!("Baz"),
1203 rest => println!("{:?}", rest),
1207 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1208 that you can create an enum that has the exact layout and ABI of the type
1210 - [There are some *syntax-only* changes:][67131]
1211 - `default` is syntactically allowed before items in `trait` definitions.
1212 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1213 leave out their bodies in favor of `;`.
1214 - Bounds on associated types in `impl`s are now syntactically allowed
1215 (e.g. `type Foo: Ord;`).
1216 - `...` (the C-variadic type) may occur syntactically directly as the type of
1217 any function parameter.
1219 These are still rejected *semantically*, so you will likely receive an error
1220 but these changes can be seen and parsed by procedural macros and
1221 conditional compilation.
1225 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1226 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1227 - [`Option::{expect,unwrap}` and
1228 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1229 pointing to the location where they were called, rather than
1230 `core`'s internals. ][67887]
1232 \* Refer to Rust's [platform support page][forge-platform-support] for more
1233 information on Rust's tiered platform support.
1237 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1238 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1239 to implement `Sized`.][67935]
1240 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1241 - [`Layout::new` is now `const`.][66254]
1242 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1247 - [`CondVar::wait_while`]
1248 - [`CondVar::wait_timeout_while`]
1250 - [`DebugMap::value`]
1251 - [`ManuallyDrop::take`]
1253 - [`ptr::slice_from_raw_parts_mut`]
1254 - [`ptr::slice_from_raw_parts`]
1258 - [You no longer need to include `extern crate proc_macro;` to be able to
1259 `use proc_macro;` in the `2018` edition.][cargo/7700]
1263 - [`Error::description` has been deprecated, and its use will now produce a
1264 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1266 [68253]: https://github.com/rust-lang/rust/pull/68253/
1267 [68348]: https://github.com/rust-lang/rust/pull/68348/
1268 [67935]: https://github.com/rust-lang/rust/pull/67935/
1269 [68339]: https://github.com/rust-lang/rust/pull/68339/
1270 [68122]: https://github.com/rust-lang/rust/pull/68122/
1271 [67712]: https://github.com/rust-lang/rust/pull/67712/
1272 [67887]: https://github.com/rust-lang/rust/pull/67887/
1273 [67131]: https://github.com/rust-lang/rust/pull/67131/
1274 [67233]: https://github.com/rust-lang/rust/pull/67233/
1275 [66899]: https://github.com/rust-lang/rust/pull/66899/
1276 [66919]: https://github.com/rust-lang/rust/pull/66919/
1277 [66254]: https://github.com/rust-lang/rust/pull/66254/
1278 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1279 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1280 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1281 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1282 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1283 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1284 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1285 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1286 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1289 Version 1.41.1 (2020-02-27)
1290 ===========================
1292 * [Always check types of static items][69145]
1293 * [Always check lifetime bounds of `Copy` impls][69145]
1294 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1296 [69225]: https://github.com/rust-lang/rust/issues/69225
1297 [69145]: https://github.com/rust-lang/rust/pull/69145
1300 Version 1.41.0 (2020-01-30)
1301 ===========================
1306 - [You can now pass type parameters to foreign items when implementing
1307 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1308 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1309 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1310 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1311 - [You can now use any valid identifier in a `format_args` macro.][66847]
1312 Previously identifiers starting with an underscore were not allowed.
1313 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1314 enum variants.][66183] These are still rejected semantically, but
1315 can be seen and parsed by procedural macros and conditional compilation.
1320 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1321 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1322 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1323 - [You can now pass an arguments file passing the `@path` syntax
1324 to rustc.][66172] Note that the format differs somewhat from what is
1325 found in other tooling; please see [the documentation][argfile-docs] for
1327 - [You can now provide `--extern` flag without a path, indicating that it is
1328 available from the search path or specified with an `-L` flag.][64882]
1330 \* Refer to Rust's [platform support page][forge-platform-support] for more
1331 information on Rust's tiered platform support.
1333 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1338 - [The `core::panic` module is now stable.][66771] It was already stable
1340 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1341 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1342 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1347 - [`Result::map_or`]
1348 - [`Result::map_or_else`]
1349 - [`std::rc::Weak::weak_count`]
1350 - [`std::rc::Weak::strong_count`]
1351 - [`std::sync::Weak::weak_count`]
1352 - [`std::sync::Weak::strong_count`]
1357 - [Cargo will now document all the private items for binary crates
1358 by default.][cargo/7593]
1359 - [`cargo-install` will now reinstall the package if it detects that it is out
1360 of date.][cargo/7560]
1361 - [Cargo.lock now uses a more git friendly format that should help to reduce
1362 merge conflicts.][cargo/7579]
1363 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1364 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1365 optimisation level to `2` for debug builds. You can also use
1366 `[profile.<profile>.build-override]` to override build scripts and
1372 - [You can now specify `edition` in documentation code blocks to compile the block
1373 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1374 should be compiled the 2018 edition of Rust.
1375 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1376 current theme with `--check-theme`.][54733]
1377 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1382 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1383 Apple targets.][apple-32bit-drop] This means that the source code is still
1384 available to build, but the targets are no longer being tested and release
1385 binaries for those platforms will no longer be distributed by the Rust project.
1386 Please refer to the linked blog post for more information.
1388 [54733]: https://github.com/rust-lang/rust/pull/54733/
1389 [61351]: https://github.com/rust-lang/rust/pull/61351/
1390 [67255]: https://github.com/rust-lang/rust/pull/67255/
1391 [66661]: https://github.com/rust-lang/rust/pull/66661/
1392 [66771]: https://github.com/rust-lang/rust/pull/66771/
1393 [66847]: https://github.com/rust-lang/rust/pull/66847/
1394 [66238]: https://github.com/rust-lang/rust/pull/66238/
1395 [66277]: https://github.com/rust-lang/rust/pull/66277/
1396 [66325]: https://github.com/rust-lang/rust/pull/66325/
1397 [66172]: https://github.com/rust-lang/rust/pull/66172/
1398 [66183]: https://github.com/rust-lang/rust/pull/66183/
1399 [65879]: https://github.com/rust-lang/rust/pull/65879/
1400 [65013]: https://github.com/rust-lang/rust/pull/65013/
1401 [64882]: https://github.com/rust-lang/rust/pull/64882/
1402 [64325]: https://github.com/rust-lang/rust/pull/64325/
1403 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1404 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1405 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1406 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1407 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1408 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1409 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1410 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1411 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1412 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1413 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1415 Version 1.40.0 (2019-12-19)
1416 ===========================
1420 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1421 `const` contexts.][65188] e.g.
1424 pub struct Point(i32, i32);
1426 const ORIGIN: Point = {
1427 let constructor = Point;
1433 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1434 indicate that there may be variants or fields added in the future.][64639]
1435 For example this requires adding a wild-card branch (`_ => {}`) to any match
1436 statements on a non-exhaustive `enum`. [(RFC 2008)]
1437 - [You can now use function-like procedural macros in `extern` blocks and in
1438 type positions.][63931] e.g. `type Generated = macro!();`
1439 - [Function-like and attribute procedural macros can now emit
1440 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1441 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1442 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1443 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1447 - [Added tier 3 support\* for the
1448 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1449 - [Added tier 3 support for the
1450 `aarch64-unknown-none-softfloat` target.][64589]
1451 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1452 `mips64el-unknown-linux-muslabi64` targets.][65843]
1454 \* Refer to Rust's [platform support page][forge-platform-support] for more
1455 information on Rust's tiered platform support.
1459 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1463 - [`BTreeMap::get_key_value`]
1464 - [`HashMap::get_key_value`]
1465 - [`Option::as_deref_mut`]
1466 - [`Option::as_deref`]
1467 - [`Option::flatten`]
1468 - [`UdpSocket::peer_addr`]
1469 - [`f32::to_be_bytes`]
1470 - [`f32::to_le_bytes`]
1471 - [`f32::to_ne_bytes`]
1472 - [`f64::to_be_bytes`]
1473 - [`f64::to_le_bytes`]
1474 - [`f64::to_ne_bytes`]
1475 - [`f32::from_be_bytes`]
1476 - [`f32::from_le_bytes`]
1477 - [`f32::from_ne_bytes`]
1478 - [`f64::from_be_bytes`]
1479 - [`f64::from_le_bytes`]
1480 - [`f64::from_ne_bytes`]
1487 - [Cargo will now always display warnings, rather than only on
1488 fresh builds.][cargo/7450]
1489 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1490 now produce an error.][cargo/7507] Previously these flags were ignored.
1491 - [You can now publish `dev-dependencies` without including
1492 a `version`.][cargo/7333]
1496 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1497 when running documentation tests with `rustdoc`.][63803]
1501 - [As previously announced, any previous NLL warnings in the 2015 edition are
1502 now hard errors.][64221]
1503 - [The `include!` macro will now warn if it failed to include the
1504 entire file.][64284] The `include!` macro unintentionally only includes the
1505 first _expression_ in a file, and this can be unintuitive. This will become
1506 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1507 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1508 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1509 or `extern` blocks now correctly emits a hard error.
1511 [65294]: https://github.com/rust-lang/rust/pull/65294/
1512 [66103]: https://github.com/rust-lang/rust/pull/66103/
1513 [65843]: https://github.com/rust-lang/rust/pull/65843/
1514 [65188]: https://github.com/rust-lang/rust/pull/65188/
1515 [65092]: https://github.com/rust-lang/rust/pull/65092/
1516 [64589]: https://github.com/rust-lang/rust/pull/64589/
1517 [64639]: https://github.com/rust-lang/rust/pull/64639/
1518 [64221]: https://github.com/rust-lang/rust/pull/64221/
1519 [64284]: https://github.com/rust-lang/rust/pull/64284/
1520 [63931]: https://github.com/rust-lang/rust/pull/63931/
1521 [64035]: https://github.com/rust-lang/rust/pull/64035/
1522 [63674]: https://github.com/rust-lang/rust/pull/63674/
1523 [63803]: https://github.com/rust-lang/rust/pull/63803/
1524 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1525 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1526 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1527 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1528 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1529 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1530 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1531 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1532 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1533 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1534 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1535 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1536 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1537 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1538 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1539 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1540 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1541 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1542 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1543 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1544 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1545 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1546 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1547 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1548 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1549 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1552 Version 1.39.0 (2019-11-07)
1553 ===========================
1557 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1558 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1559 - [You can now use certain attributes on function, closure, and function pointer
1560 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1561 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1562 attributes applied to items. e.g.
1565 #[cfg(windows)] slice: &[u16],
1566 #[cfg(not(windows))] slice: &[u8],
1571 - [You can now take shared references to bind-by-move patterns in the `if` guards
1572 of `match` arms.][63118] e.g.
1575 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1579 // ---- `nums` is bound by move.
1580 if nums.iter().sum::<u8>() == 10
1581 // ^------ `.iter()` implicitly takes a reference to `nums`.
1584 // ----------- Legal as `nums` was bound by move and so we have ownership.
1586 _ => unreachable!(),
1595 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1596 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1597 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1598 **Note** Cargo currently doesn't use this feature. Refer to
1599 [cargo#7315][cargo/7315] to track this feature's progress.
1600 - [You can now pass `--show-output` argument to test binaries to print the
1601 output of successful tests.][62600]
1604 \* Refer to Rust's [platform support page][forge-platform-support] for more
1605 information on Rust's tiered platform support.
1609 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1610 - [`LinkedList::new` is now a `const` function.][63684]
1611 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1612 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1613 now `const`.][63786]
1617 - [`Pin::into_inner`]
1618 - [`Instant::checked_duration_since`]
1619 - [`Instant::saturating_duration_since`]
1623 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1624 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1625 `--all` is now deprecated.
1629 - [You can now pass `-Clinker` to rustdoc to control the linker used
1630 for compiling doctests.][63834]
1634 - [Code that was previously accepted by the old borrow checker, but rejected by
1635 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1636 previously a warning, and will also become a hard error in the Rust 2015
1637 edition in the 1.40.0 release.
1638 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1639 run tests.][63827] This should improve performance when running a large
1641 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1642 recommended to use the `?` operator instead.
1643 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1646 [62600]: https://github.com/rust-lang/rust/pull/62600/
1647 [62672]: https://github.com/rust-lang/rust/pull/62672/
1648 [63118]: https://github.com/rust-lang/rust/pull/63118/
1649 [63209]: https://github.com/rust-lang/rust/pull/63209/
1650 [63402]: https://github.com/rust-lang/rust/pull/63402/
1651 [63565]: https://github.com/rust-lang/rust/pull/63565/
1652 [63595]: https://github.com/rust-lang/rust/pull/63595/
1653 [63684]: https://github.com/rust-lang/rust/pull/63684/
1654 [63698]: https://github.com/rust-lang/rust/pull/63698/
1655 [63770]: https://github.com/rust-lang/rust/pull/63770/
1656 [63786]: https://github.com/rust-lang/rust/pull/63786/
1657 [63827]: https://github.com/rust-lang/rust/pull/63827/
1658 [63834]: https://github.com/rust-lang/rust/pull/63834/
1659 [63927]: https://github.com/rust-lang/rust/pull/63927/
1660 [63933]: https://github.com/rust-lang/rust/pull/63933/
1661 [63934]: https://github.com/rust-lang/rust/pull/63934/
1662 [63938]: https://github.com/rust-lang/rust/pull/63938/
1663 [63940]: https://github.com/rust-lang/rust/pull/63940/
1664 [63941]: https://github.com/rust-lang/rust/pull/63941/
1665 [63945]: https://github.com/rust-lang/rust/pull/63945/
1666 [64010]: https://github.com/rust-lang/rust/pull/64010/
1667 [64028]: https://github.com/rust-lang/rust/pull/64028/
1668 [64334]: https://github.com/rust-lang/rust/pull/64334/
1669 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1670 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1671 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1672 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1673 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1674 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1676 Version 1.38.0 (2019-09-26)
1677 ==========================
1681 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1682 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1686 - [Added pipelined compilation support to `rustc`.][62766] This will
1687 improve compilation times in some cases. For further information please refer
1688 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1689 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1690 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1691 `x86_64-uwp-windows-msvc` targets.][60260]
1692 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1693 `armv7-unknown-linux-musleabi` targets.][63107]
1694 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1695 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1696 - [Upgraded to LLVM 9.][62592]
1698 \* Refer to Rust's [platform support page][forge-platform-support] for more
1699 information on Rust's tiered platform support.
1703 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1704 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1705 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1706 is available at `std::clone::Clone`). This also makes all built-in macros
1707 available in `std`/`core` root. e.g. `std::include_bytes!`.
1708 - [`str::Chars` now implements `Debug`.][63000]
1709 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1710 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1711 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1712 - [Added euclidean remainder and division operations (`div_euclid`,
1713 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1714 `overflowing`, and `wrapping` versions are available for all
1716 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1717 `PartialEq`.][61491]
1718 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1722 - [`<*const T>::cast`]
1723 - [`<*mut T>::cast`]
1724 - [`Duration::as_secs_f32`]
1725 - [`Duration::as_secs_f64`]
1726 - [`Duration::div_f32`]
1727 - [`Duration::div_f64`]
1728 - [`Duration::from_secs_f32`]
1729 - [`Duration::from_secs_f64`]
1730 - [`Duration::mul_f32`]
1731 - [`Duration::mul_f64`]
1732 - [`any::type_name`]
1736 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1737 - [You can now pass the `--features` option multiple times to enable
1738 multiple features.][cargo/7084]
1742 - [`rustc` will now warn about some incorrect uses of
1743 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1747 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1749 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1750 issues][62896] with certain crates such as libc.
1752 [60260]: https://github.com/rust-lang/rust/pull/60260/
1753 [61457]: https://github.com/rust-lang/rust/pull/61457/
1754 [61491]: https://github.com/rust-lang/rust/pull/61491/
1755 [61884]: https://github.com/rust-lang/rust/pull/61884/
1756 [61953]: https://github.com/rust-lang/rust/pull/61953/
1757 [62042]: https://github.com/rust-lang/rust/pull/62042/
1758 [62528]: https://github.com/rust-lang/rust/pull/62528/
1759 [62583]: https://github.com/rust-lang/rust/pull/62583/
1760 [62735]: https://github.com/rust-lang/rust/pull/62735/
1761 [62766]: https://github.com/rust-lang/rust/pull/62766/
1762 [62784]: https://github.com/rust-lang/rust/pull/62784/
1763 [62592]: https://github.com/rust-lang/rust/pull/62592/
1764 [62785]: https://github.com/rust-lang/rust/issues/62785/
1765 [62814]: https://github.com/rust-lang/rust/pull/62814/
1766 [62896]: https://github.com/rust-lang/rust/issues/62896/
1767 [63000]: https://github.com/rust-lang/rust/pull/63000/
1768 [63056]: https://github.com/rust-lang/rust/pull/63056/
1769 [63107]: https://github.com/rust-lang/rust/pull/63107/
1770 [63346]: https://github.com/rust-lang/rust/pull/63346/
1771 [63421]: https://github.com/rust-lang/rust/pull/63421/
1772 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1773 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1774 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1775 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1776 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1777 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1778 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1779 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1780 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1781 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1782 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1783 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1784 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1785 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1786 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1788 Version 1.37.0 (2019-08-15)
1789 ==========================
1793 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1794 [`Box`][62228], or an [array][62235] and unused.
1795 - [You can now use the `cfg` and `cfg_attr` attributes on
1796 generic parameters.][61547]
1797 - [You can now use enum variants through type alias.][61682] e.g. You can
1798 write the following:
1800 type MyOption = Option<u8>;
1802 fn increment_or_zero(x: MyOption) -> u8 {
1804 MyOption::Some(y) => y + 1,
1805 MyOption::None => 0,
1809 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1810 `const _: u32 = 5;`.
1811 - [You can now use `#[repr(align(X)]` on enums.][61229]
1812 - [The `?` Kleene macro operator is now available in the
1813 2015 edition.][60932]
1817 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1818 and `-C profile-use` flags.][61268] For more information on how to use profile
1819 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1820 - [The `rust-lldb` wrapper script should now work again.][61827]
1824 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1828 - [`BufReader::buffer`]
1829 - [`BufWriter::buffer`]
1830 - [`Cell::from_mut`]
1831 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1832 - [`DoubleEndedIterator::nth_back`]
1834 - [`Wrapping::reverse_bits`]
1835 - [`i128::reverse_bits`]
1836 - [`i16::reverse_bits`]
1837 - [`i32::reverse_bits`]
1838 - [`i64::reverse_bits`]
1839 - [`i8::reverse_bits`]
1840 - [`isize::reverse_bits`]
1841 - [`slice::copy_within`]
1842 - [`u128::reverse_bits`]
1843 - [`u16::reverse_bits`]
1844 - [`u32::reverse_bits`]
1845 - [`u64::reverse_bits`]
1846 - [`u8::reverse_bits`]
1847 - [`usize::reverse_bits`]
1851 - [`Cargo.lock` files are now included by default when publishing executable crates
1852 with executables.][cargo/7026]
1853 - [You can now specify `default-run="foo"` in `[package]` to specify the
1854 default executable to use for `cargo run`.][cargo/7056]
1861 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1862 Please transition your code to using the `..=` syntax for inclusive
1864 - [Using a trait object without the `dyn` will now warn by default.][61203]
1865 Please transition your code to use `dyn Trait` for trait objects instead.
1867 [62228]: https://github.com/rust-lang/rust/pull/62228/
1868 [62235]: https://github.com/rust-lang/rust/pull/62235/
1869 [61802]: https://github.com/rust-lang/rust/pull/61802/
1870 [61827]: https://github.com/rust-lang/rust/pull/61827/
1871 [61547]: https://github.com/rust-lang/rust/pull/61547/
1872 [61682]: https://github.com/rust-lang/rust/pull/61682/
1873 [61268]: https://github.com/rust-lang/rust/pull/61268/
1874 [61342]: https://github.com/rust-lang/rust/pull/61342/
1875 [61347]: https://github.com/rust-lang/rust/pull/61347/
1876 [61100]: https://github.com/rust-lang/rust/pull/61100/
1877 [61203]: https://github.com/rust-lang/rust/pull/61203/
1878 [61229]: https://github.com/rust-lang/rust/pull/61229/
1879 [60932]: https://github.com/rust-lang/rust/pull/60932/
1880 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1881 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1882 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1883 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1884 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1885 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1886 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1887 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1888 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1889 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1890 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1891 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1892 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1893 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1894 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1895 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1896 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1897 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1898 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1899 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1900 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1901 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1902 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1903 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1906 Version 1.36.0 (2019-07-04)
1907 ==========================
1911 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1912 - [The order of traits in trait objects no longer affects the semantics of that
1913 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1914 `dyn fmt::Debug + Send`, where this was previously not the case.
1918 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1919 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1920 - [`mem::needs_drop` is now available as a const fn.][60364]
1921 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1922 - [`String` now implements `BorrowMut<str>`.][60404]
1923 - [`io::Cursor` now implements `Default`.][60234]
1924 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1925 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1926 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1927 environment has access to heap memory allocation.
1928 - [`String` now implements `From<&String>`.][59825]
1929 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1930 return a tuple of each argument when there is multiple arguments.
1931 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1936 - [`VecDeque::rotate_left`]
1937 - [`VecDeque::rotate_right`]
1938 - [`Iterator::copied`]
1940 - [`io::IoSliceMut`]
1941 - [`Read::read_vectored`]
1942 - [`Write::write_vectored`]
1943 - [`str::as_mut_ptr`]
1944 - [`mem::MaybeUninit`]
1945 - [`pointer::align_offset`]
1946 - [`future::Future`]
1948 - [`task::RawWaker`]
1949 - [`task::RawWakerVTable`]
1955 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1956 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1958 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1962 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1969 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1970 longer recommended, and will be deprecated in 1.39.0.
1972 [60318]: https://github.com/rust-lang/rust/pull/60318/
1973 [60364]: https://github.com/rust-lang/rust/pull/60364/
1974 [60370]: https://github.com/rust-lang/rust/pull/60370/
1975 [60404]: https://github.com/rust-lang/rust/pull/60404/
1976 [60234]: https://github.com/rust-lang/rust/pull/60234/
1977 [60244]: https://github.com/rust-lang/rust/pull/60244/
1978 [58623]: https://github.com/rust-lang/rust/pull/58623/
1979 [59648]: https://github.com/rust-lang/rust/pull/59648/
1980 [59675]: https://github.com/rust-lang/rust/pull/59675/
1981 [59825]: https://github.com/rust-lang/rust/pull/59825/
1982 [59826]: https://github.com/rust-lang/rust/pull/59826/
1983 [59445]: https://github.com/rust-lang/rust/pull/59445/
1984 [59114]: https://github.com/rust-lang/rust/pull/59114/
1985 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1986 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1987 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1988 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1989 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1990 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1991 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1992 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1993 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1994 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1995 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1996 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1997 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1998 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1999 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2000 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2001 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2002 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2003 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2004 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2007 Version 1.35.0 (2019-05-23)
2008 ==========================
2012 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2013 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2014 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2016 unsafe fn call_unsafe(func: unsafe fn()) {
2021 unsafe { call_unsafe(|| {}); }
2028 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2029 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2030 - [Added the `wasm32-unknown-wasi` target.][59464]
2035 - [`Thread` will now show its ID in `Debug` output.][59460]
2036 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2037 - [`alloc::System` now implements `Default`.][59451]
2038 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2040 - [`char::{ToLowercase, ToUppercase}` now
2041 implement `ExactSizeIterator`.][58778]
2042 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2043 - [Removed the `Read` trait bounds
2044 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2045 - [You can now call the `dbg!` macro without any parameters to print the file
2046 and line where it is called.][57847]
2047 - [In place ASCII case conversions are now up to 4× faster.][59283]
2048 e.g. `str::make_ascii_lowercase`
2049 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2056 - [`RefCell::replace_with`]
2057 - [`RefCell::map_split`]
2059 - [`Range::contains`]
2060 - [`RangeFrom::contains`]
2061 - [`RangeTo::contains`]
2062 - [`RangeInclusive::contains`]
2063 - [`RangeToInclusive::contains`]
2064 - [`Option::copied`]
2068 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2069 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2074 - [The Rust toolchain is now available natively for musl based distros.][58575]
2076 [59460]: https://github.com/rust-lang/rust/pull/59460/
2077 [59464]: https://github.com/rust-lang/rust/pull/59464/
2078 [59500]: https://github.com/rust-lang/rust/pull/59500/
2079 [59512]: https://github.com/rust-lang/rust/pull/59512/
2080 [59580]: https://github.com/rust-lang/rust/pull/59580/
2081 [59283]: https://github.com/rust-lang/rust/pull/59283/
2082 [59451]: https://github.com/rust-lang/rust/pull/59451/
2083 [59076]: https://github.com/rust-lang/rust/pull/59076/
2084 [58778]: https://github.com/rust-lang/rust/pull/58778/
2085 [58717]: https://github.com/rust-lang/rust/pull/58717/
2086 [58369]: https://github.com/rust-lang/rust/pull/58369/
2087 [58423]: https://github.com/rust-lang/rust/pull/58423/
2088 [58080]: https://github.com/rust-lang/rust/pull/58080/
2089 [57847]: https://github.com/rust-lang/rust/pull/57847/
2090 [58575]: https://github.com/rust-lang/rust/pull/58575
2091 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2092 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2093 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2094 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2095 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2096 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2097 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2098 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2099 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2100 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2101 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2102 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2104 Version 1.34.2 (2019-05-14)
2105 ===========================
2107 * [Destabilize the `Error::type_id` function due to a security
2108 vulnerability][60785] ([CVE-2019-12083])
2110 [60785]: https://github.com/rust-lang/rust/pull/60785
2111 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2113 Version 1.34.1 (2019-04-25)
2114 ===========================
2116 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2117 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2118 * [Fix Clippy panic when checking some macros][clippy/3805]
2120 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2121 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2122 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2124 Version 1.34.0 (2019-04-11)
2125 ==========================
2129 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2130 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2132 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2133 `#[attr{}]` procedural macros.][57367]
2134 - [You can now write `extern crate self as foo;`][57407] to import your
2135 crate's root into the extern prelude.
2140 - [You can now target `riscv64imac-unknown-none-elf` and
2141 `riscv64gc-unknown-none-elf`.][58406]
2142 - [You can now enable linker plugin LTO optimisations with
2143 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2144 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2146 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2151 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2152 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2153 the `Hash` trait to create an iterator.
2154 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2155 methods.][58421] Most notably you no longer require the `Ord` trait to create
2157 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2158 for all numeric types.][58044]
2159 - [Indexing a `str` is now generic over all types that
2160 implement `SliceIndex<str>`.][57604]
2161 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2162 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2163 produce a warning if their returning type is unused.
2164 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2165 `overflowing_pow` are now available for all numeric types.][57873] These are
2166 equivalent to methods such as `wrapping_add` for the `pow` operation.
2174 * [`Error::type_id`]
2175 * [`atomic::AtomicI16`]
2176 * [`atomic::AtomicI32`]
2177 * [`atomic::AtomicI64`]
2178 * [`atomic::AtomicI8`]
2179 * [`atomic::AtomicU16`]
2180 * [`atomic::AtomicU32`]
2181 * [`atomic::AtomicU64`]
2182 * [`atomic::AtomicU8`]
2183 * [`convert::Infallible`]
2184 * [`convert::TryFrom`]
2185 * [`convert::TryInto`]
2187 * [`iter::successors`]
2188 * [`num::NonZeroI128`]
2189 * [`num::NonZeroI16`]
2190 * [`num::NonZeroI32`]
2191 * [`num::NonZeroI64`]
2192 * [`num::NonZeroI8`]
2193 * [`num::NonZeroIsize`]
2194 * [`slice::sort_by_cached_key`]
2195 * [`str::escape_debug`]
2196 * [`str::escape_default`]
2197 * [`str::escape_unicode`]
2198 * [`str::split_ascii_whitespace`]
2201 * [`Instant::checked_add`]
2202 * [`Instant::checked_sub`]
2203 * [`SystemTime::checked_add`]
2204 * [`SystemTime::checked_sub`]
2208 - [You can now use alternative registries to crates.io.][cargo/6654]
2212 - [You can now use the `?` operator in your documentation tests without manually
2213 adding `fn main() -> Result<(), _> {}`.][56470]
2217 - [`Command::before_exec` is being replaced by the unsafe method
2218 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2219 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2220 can now use `const` functions in `static` variables.
2222 [58370]: https://github.com/rust-lang/rust/pull/58370/
2223 [58406]: https://github.com/rust-lang/rust/pull/58406/
2224 [58421]: https://github.com/rust-lang/rust/pull/58421/
2225 [58166]: https://github.com/rust-lang/rust/pull/58166/
2226 [58044]: https://github.com/rust-lang/rust/pull/58044/
2227 [58057]: https://github.com/rust-lang/rust/pull/58057/
2228 [58059]: https://github.com/rust-lang/rust/pull/58059/
2229 [57809]: https://github.com/rust-lang/rust/pull/57809/
2230 [57873]: https://github.com/rust-lang/rust/pull/57873/
2231 [57604]: https://github.com/rust-lang/rust/pull/57604/
2232 [57367]: https://github.com/rust-lang/rust/pull/57367/
2233 [57407]: https://github.com/rust-lang/rust/pull/57407/
2234 [57425]: https://github.com/rust-lang/rust/pull/57425/
2235 [57106]: https://github.com/rust-lang/rust/pull/57106/
2236 [56470]: https://github.com/rust-lang/rust/pull/56470/
2237 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2238 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2239 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2240 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2241 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2242 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2243 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2244 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2245 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2246 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2247 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2248 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2249 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2250 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2251 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2252 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2253 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2254 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2255 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2256 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2257 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2258 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2259 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2260 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2261 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2262 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2263 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2264 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2265 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2266 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2267 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2270 Version 1.33.0 (2019-02-28)
2271 ==========================
2275 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2276 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2277 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2278 E.g. You can have match statement on a `u8` that covers `0..=255` and
2279 you would no longer be required to have a `_ => unreachable!()` case.
2280 - [You can now have multiple patterns in `if let` and `while let`
2281 expressions.][57532] You can do this with the same syntax as a `match`
2291 let state = Creature::Crab("Ferris");
2293 if let Creature::Crab(name) | Creature::Person(name) = state {
2294 println!("This creature's name is: {}", name);
2298 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2299 this feature will by default produce a warning as this behaviour can be
2300 unintuitive. E.g. `if let _ = 5 {}`
2301 - [You can now use `let` bindings, assignments, expression statements,
2302 and irrefutable pattern destructuring in const functions.][57175]
2303 - [You can now call unsafe const functions.][57067] E.g.
2305 const unsafe fn foo() -> i32 { 5 }
2306 const fn bar() -> i32 {
2310 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2311 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2312 - [You can now specify a specific alignment with the `#[repr(packed)]`
2313 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2314 with an alignment of 2 bytes and a size of 6 bytes.
2315 - [You can now import an item from a module as an `_`.][56303] This allows you to
2316 import a trait's impls, and not have the name in the namespace. E.g.
2318 use std::io::Read as _;
2320 // Allowed as there is only one `Read` in the module.
2323 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2327 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2328 command line argument.][56351]
2329 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2330 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2331 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2332 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2333 information on Rust's platform support.
2334 - [Added support for the `thumbv7neon-linux-androideabi` and
2335 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2336 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2340 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2341 functions for all numeric types.][57566]
2342 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2343 are now `const` functions for all numeric types.][57105]
2344 - [The methods `is_positive` and `is_negative` are now `const` functions for
2345 all signed numeric types.][57105]
2346 - [The `get` method for all `NonZero` types is now `const`.][57167]
2347 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2348 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2349 numeric types.][57234]
2350 - [`Ipv4Addr::new` is now a `const` function][57234]
2354 - [`unix::FileExt::read_exact_at`]
2355 - [`unix::FileExt::write_all_at`]
2356 - [`Option::transpose`]
2357 - [`Result::transpose`]
2358 - [`convert::identity`]
2361 - [`marker::PhantomPinned`]
2362 - [`Vec::resize_with`]
2363 - [`VecDeque::resize_with`]
2364 - [`Duration::as_millis`]
2365 - [`Duration::as_micros`]
2366 - [`Duration::as_nanos`]
2371 - [You can now publish crates that require a feature flag to compile with
2372 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2373 - [Cargo should now rebuild a crate if a file was modified during the initial
2378 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2379 are now deprecated in the standard library, and their usage will now produce a warning.
2380 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2382 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2384 - [Libtest no longer creates a new thread for each test when
2385 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2387 [55982]: https://github.com/rust-lang/rust/pull/55982/
2388 [56243]: https://github.com/rust-lang/rust/pull/56243
2389 [56303]: https://github.com/rust-lang/rust/pull/56303/
2390 [56351]: https://github.com/rust-lang/rust/pull/56351/
2391 [56362]: https://github.com/rust-lang/rust/pull/56362
2392 [56642]: https://github.com/rust-lang/rust/pull/56642/
2393 [56769]: https://github.com/rust-lang/rust/pull/56769/
2394 [56805]: https://github.com/rust-lang/rust/pull/56805
2395 [56947]: https://github.com/rust-lang/rust/pull/56947/
2396 [57049]: https://github.com/rust-lang/rust/pull/57049/
2397 [57067]: https://github.com/rust-lang/rust/pull/57067/
2398 [57105]: https://github.com/rust-lang/rust/pull/57105
2399 [57130]: https://github.com/rust-lang/rust/pull/57130/
2400 [57167]: https://github.com/rust-lang/rust/pull/57167/
2401 [57175]: https://github.com/rust-lang/rust/pull/57175/
2402 [57234]: https://github.com/rust-lang/rust/pull/57234/
2403 [57332]: https://github.com/rust-lang/rust/pull/57332/
2404 [57465]: https://github.com/rust-lang/rust/pull/57465/
2405 [57532]: https://github.com/rust-lang/rust/pull/57532/
2406 [57535]: https://github.com/rust-lang/rust/pull/57535/
2407 [57566]: https://github.com/rust-lang/rust/pull/57566/
2408 [57615]: https://github.com/rust-lang/rust/pull/57615/
2409 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2410 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2411 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2412 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2413 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2414 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2415 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2416 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2417 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2418 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2419 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2420 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2421 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2422 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2423 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2424 [platform-support]: https://forge.rust-lang.org/platform-support.html
2426 Version 1.32.0 (2019-01-17)
2427 ==========================
2432 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2433 operator allows you to specify zero or one repetitions similar to the `*` and
2435 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2436 now always resolve to the item (`enum`, `struct`, etc.) available in the
2437 module if present, before resolving to a external crate or an item the prelude.][56759]
2440 enum Color { Red, Green, Blue }
2446 - [You can now match against `PhantomData<T>` types.][55837]
2447 - [You can now match against literals in macros with the `literal`
2448 specifier.][56072] This will match against a literal of any type.
2449 E.g. `1`, `'A'`, `"Hello World"`
2450 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2452 struct Point(i32, i32);
2455 pub fn new(x: i32, y: i32) -> Self {
2459 pub fn is_origin(&self) -> bool {
2467 - [Self can also now be used in type definitions.][56366] E.g.
2471 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2474 Cons(T, Box<Self>) // likewise here
2477 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2478 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2482 - [The default allocator has changed from jemalloc to the default allocator on
2483 your system.][55238] The compiler itself on Linux & macOS will still use
2484 jemalloc, but programs compiled with it will use the system allocator.
2485 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2489 - [`PathBuf` now implements `FromStr`.][55148]
2490 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2491 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2492 easily debug expressions in your rust program. E.g.
2495 let b = dbg!(a * 2) + 1;
2496 // ^-- prints: [src/main.rs:4] a * 2 = 4
2500 The following APIs are now `const` functions and can be used in a
2504 - [`UnsafeCell::get`]
2505 - [`char::is_ascii`]
2507 - [`ManuallyDrop::new`]
2508 - [`ManuallyDrop::into_inner`]
2509 - [`RangeInclusive::start`]
2510 - [`RangeInclusive::end`]
2511 - [`NonNull::as_ptr`]
2514 - [`Duration::as_secs`]
2515 - [`Duration::subsec_millis`]
2516 - [`Duration::subsec_micros`]
2517 - [`Duration::subsec_nanos`]
2519 - [`Ipv4Addr::is_unspecified`]
2521 - [`Ipv6Addr::octets`]
2525 - [`i8::to_be_bytes`]
2526 - [`i8::to_le_bytes`]
2527 - [`i8::to_ne_bytes`]
2528 - [`i8::from_be_bytes`]
2529 - [`i8::from_le_bytes`]
2530 - [`i8::from_ne_bytes`]
2531 - [`i16::to_be_bytes`]
2532 - [`i16::to_le_bytes`]
2533 - [`i16::to_ne_bytes`]
2534 - [`i16::from_be_bytes`]
2535 - [`i16::from_le_bytes`]
2536 - [`i16::from_ne_bytes`]
2537 - [`i32::to_be_bytes`]
2538 - [`i32::to_le_bytes`]
2539 - [`i32::to_ne_bytes`]
2540 - [`i32::from_be_bytes`]
2541 - [`i32::from_le_bytes`]
2542 - [`i32::from_ne_bytes`]
2543 - [`i64::to_be_bytes`]
2544 - [`i64::to_le_bytes`]
2545 - [`i64::to_ne_bytes`]
2546 - [`i64::from_be_bytes`]
2547 - [`i64::from_le_bytes`]
2548 - [`i64::from_ne_bytes`]
2549 - [`i128::to_be_bytes`]
2550 - [`i128::to_le_bytes`]
2551 - [`i128::to_ne_bytes`]
2552 - [`i128::from_be_bytes`]
2553 - [`i128::from_le_bytes`]
2554 - [`i128::from_ne_bytes`]
2555 - [`isize::to_be_bytes`]
2556 - [`isize::to_le_bytes`]
2557 - [`isize::to_ne_bytes`]
2558 - [`isize::from_be_bytes`]
2559 - [`isize::from_le_bytes`]
2560 - [`isize::from_ne_bytes`]
2561 - [`u8::to_be_bytes`]
2562 - [`u8::to_le_bytes`]
2563 - [`u8::to_ne_bytes`]
2564 - [`u8::from_be_bytes`]
2565 - [`u8::from_le_bytes`]
2566 - [`u8::from_ne_bytes`]
2567 - [`u16::to_be_bytes`]
2568 - [`u16::to_le_bytes`]
2569 - [`u16::to_ne_bytes`]
2570 - [`u16::from_be_bytes`]
2571 - [`u16::from_le_bytes`]
2572 - [`u16::from_ne_bytes`]
2573 - [`u32::to_be_bytes`]
2574 - [`u32::to_le_bytes`]
2575 - [`u32::to_ne_bytes`]
2576 - [`u32::from_be_bytes`]
2577 - [`u32::from_le_bytes`]
2578 - [`u32::from_ne_bytes`]
2579 - [`u64::to_be_bytes`]
2580 - [`u64::to_le_bytes`]
2581 - [`u64::to_ne_bytes`]
2582 - [`u64::from_be_bytes`]
2583 - [`u64::from_le_bytes`]
2584 - [`u64::from_ne_bytes`]
2585 - [`u128::to_be_bytes`]
2586 - [`u128::to_le_bytes`]
2587 - [`u128::to_ne_bytes`]
2588 - [`u128::from_be_bytes`]
2589 - [`u128::from_le_bytes`]
2590 - [`u128::from_ne_bytes`]
2591 - [`usize::to_be_bytes`]
2592 - [`usize::to_le_bytes`]
2593 - [`usize::to_ne_bytes`]
2594 - [`usize::from_be_bytes`]
2595 - [`usize::from_le_bytes`]
2596 - [`usize::from_ne_bytes`]
2600 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2601 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2605 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2609 - [The argument types for AVX's
2610 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2611 been changed from `*const` to `*mut` as the previous implementation
2615 [55148]: https://github.com/rust-lang/rust/pull/55148/
2616 [55238]: https://github.com/rust-lang/rust/pull/55238/
2617 [55280]: https://github.com/rust-lang/rust/pull/55280/
2618 [55610]: https://github.com/rust-lang/rust/pull/55610/
2619 [55663]: https://github.com/rust-lang/rust/pull/55663/
2620 [55702]: https://github.com/rust-lang/rust/pull/55702/
2621 [55837]: https://github.com/rust-lang/rust/pull/55837/
2622 [55843]: https://github.com/rust-lang/rust/pull/55843/
2623 [56072]: https://github.com/rust-lang/rust/pull/56072/
2624 [56245]: https://github.com/rust-lang/rust/pull/56245/
2625 [56365]: https://github.com/rust-lang/rust/pull/56365/
2626 [56366]: https://github.com/rust-lang/rust/pull/56366/
2627 [56395]: https://github.com/rust-lang/rust/pull/56395/
2628 [56759]: https://github.com/rust-lang/rust/pull/56759/
2629 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2630 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2631 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2632 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2633 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2634 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2635 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2636 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2637 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2638 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2639 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2640 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2641 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2642 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2643 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2644 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2645 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2646 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2647 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2648 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2649 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2650 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2651 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2652 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2653 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2654 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2655 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2656 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2657 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2658 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2659 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2660 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2661 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2662 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2663 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2664 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2665 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2666 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2667 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2668 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2669 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2670 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2671 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2672 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2673 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2674 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2675 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2676 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2677 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2678 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2679 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2680 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2681 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2682 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2683 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2684 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2685 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2686 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2687 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2688 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2689 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2690 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2691 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2692 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2693 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2694 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2695 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2696 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2697 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2698 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2699 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2700 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2701 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2702 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2703 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2704 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2705 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2706 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2707 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2708 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2709 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2710 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2711 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2712 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2713 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2714 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2715 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2716 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2717 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2718 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2719 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2720 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2721 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2724 Version 1.31.1 (2018-12-20)
2725 ===========================
2727 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2728 - [Fix broken go-to-definition in RLS][rls/1171]
2729 - [Fix infinite loop on hover in RLS][rls/1170]
2731 [56562]: https://github.com/rust-lang/rust/pull/56562
2732 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2733 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2735 Version 1.31.0 (2018-12-06)
2736 ==========================
2740 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2741 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2742 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2743 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2745 - [You can now define and use `const` functions.][54835] These are currently
2746 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2747 [language reference][const-reference] for what exactly is available.
2748 - [You can now use tool lints, which allow you to scope lints from external
2749 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2750 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2751 a crate, not just in exported functions.][54451]
2752 - [You can now use parentheses in pattern matches.][54497]
2756 - [Updated musl to 1.1.20][54430]
2760 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2761 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2762 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2763 into `Option<&mut T>` using the `From` trait.][53218]
2764 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2769 - [`slice::align_to`]
2770 - [`slice::align_to_mut`]
2771 - [`slice::chunks_exact`]
2772 - [`slice::chunks_exact_mut`]
2773 - [`slice::rchunks`]
2774 - [`slice::rchunks_mut`]
2775 - [`slice::rchunks_exact`]
2776 - [`slice::rchunks_exact_mut`]
2777 - [`Option::replace`]
2781 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2782 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2783 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2785 [52813]: https://github.com/rust-lang/rust/pull/52813/
2786 [53218]: https://github.com/rust-lang/rust/pull/53218/
2787 [53555]: https://github.com/rust-lang/rust/issues/53555/
2788 [54057]: https://github.com/rust-lang/rust/pull/54057/
2789 [54240]: https://github.com/rust-lang/rust/pull/54240/
2790 [54430]: https://github.com/rust-lang/rust/pull/54430/
2791 [54451]: https://github.com/rust-lang/rust/pull/54451/
2792 [54497]: https://github.com/rust-lang/rust/pull/54497/
2793 [54778]: https://github.com/rust-lang/rust/pull/54778/
2794 [54835]: https://github.com/rust-lang/rust/pull/54835/
2795 [54870]: https://github.com/rust-lang/rust/pull/54870/
2796 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2797 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2798 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2799 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2800 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2801 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2802 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2803 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2804 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2805 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2806 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2807 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2808 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2809 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2811 Version 1.30.1 (2018-11-08)
2812 ===========================
2814 - [Fixed overflow ICE in rustdoc][54199]
2815 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2817 [54199]: https://github.com/rust-lang/rust/pull/54199
2818 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2820 Version 1.30.0 (2018-10-25)
2821 ==========================
2825 - [Procedural macros are now available.][52081] These kinds of macros allow for
2826 more powerful code generation. There is a [new chapter available][proc-macros]
2827 in the Rust Programming Language book that goes further in depth.
2828 - [You can now use keywords as identifiers using the raw identifiers
2829 syntax (`r#`),][53236] e.g. `let r#for = true;`
2830 - [Using anonymous parameters in traits is now deprecated with a warning and
2831 will be a hard error in the 2018 edition.][53272]
2832 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2833 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2834 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2835 Previously, using a external crate in a module without a use statement
2836 required `let json = ::serde_json::from_str(foo);` but can now be written
2837 as `let json = serde_json::from_str(foo);`.
2838 - [You can now apply the `#[used]` attribute to static items to prevent the
2839 compiler from optimising them away, even if they appear to be unused,][51363]
2840 e.g. `#[used] static FOO: u32 = 1;`
2841 - [You can now import and reexport macros from other crates with the `use`
2842 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2843 the root module of the crate. If your macro relies on calling other local
2844 macros, it is recommended to export with the
2845 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2847 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2848 using the `vis` specifier.][53370]
2849 - [Non-macro attributes now allow all forms of literals, not just
2850 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2851 write `#[attr(true)]`.
2852 - [You can now specify a function to handle a panic in the Rust runtime with the
2853 `#[panic_handler]` attribute.][51366]
2857 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2858 - [Added the `aarch64-unknown-netbsd` target][53165]
2859 - [Upgraded to LLVM 8.][53611]
2863 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2867 - [`Ipv4Addr::BROADCAST`]
2868 - [`Ipv4Addr::LOCALHOST`]
2869 - [`Ipv4Addr::UNSPECIFIED`]
2870 - [`Ipv6Addr::LOCALHOST`]
2871 - [`Ipv6Addr::UNSPECIFIED`]
2872 - [`Iterator::find_map`]
2874 The following methods are replacement methods for `trim_left`, `trim_right`,
2875 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2877 - [`str::trim_end_matches`]
2879 - [`str::trim_start_matches`]
2880 - [`str::trim_start`]
2884 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2885 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2886 equivalent to calling `rustdoc --error-format=json`.
2887 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2891 - [`rustdoc` allows you to specify what edition to treat your code as with the
2892 `--edition` option.][54057]
2893 - [`rustdoc` now has the `--color` (specify whether to output color) and
2894 `--error-format` (specify error format, e.g. `json`) options.][53003]
2895 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2896 debug symbols.][53774]
2897 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2898 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2900 [50911]: https://github.com/rust-lang/rust/pull/50911/
2901 [51363]: https://github.com/rust-lang/rust/pull/51363/
2902 [51366]: https://github.com/rust-lang/rust/pull/51366/
2903 [52081]: https://github.com/rust-lang/rust/pull/52081/
2904 [53003]: https://github.com/rust-lang/rust/pull/53003/
2905 [53033]: https://github.com/rust-lang/rust/pull/53033/
2906 [53044]: https://github.com/rust-lang/rust/pull/53044/
2907 [53165]: https://github.com/rust-lang/rust/pull/53165/
2908 [53611]: https://github.com/rust-lang/rust/pull/53611/
2909 [53213]: https://github.com/rust-lang/rust/pull/53213/
2910 [53236]: https://github.com/rust-lang/rust/pull/53236/
2911 [53272]: https://github.com/rust-lang/rust/pull/53272/
2912 [53370]: https://github.com/rust-lang/rust/pull/53370/
2913 [53459]: https://github.com/rust-lang/rust/pull/53459/
2914 [53774]: https://github.com/rust-lang/rust/pull/53774/
2915 [53822]: https://github.com/rust-lang/rust/pull/53822/
2916 [54057]: https://github.com/rust-lang/rust/pull/54057/
2917 [54146]: https://github.com/rust-lang/rust/pull/54146/
2918 [54404]: https://github.com/rust-lang/rust/pull/54404/
2919 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2920 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2921 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2922 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2924 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2925 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2926 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2927 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2928 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2929 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2930 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2931 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2932 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2933 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2936 Version 1.29.2 (2018-10-11)
2937 ===========================
2939 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2940 - The `rls-preview` component on the windows-gnu targets has been restored.
2942 [54639]: https://github.com/rust-lang/rust/pull/54639
2945 Version 1.29.1 (2018-09-25)
2946 ===========================
2951 - The standard library's `str::repeat` function contained an out of bounds write
2952 caused by an integer overflow. This has been fixed by deterministically
2953 panicking when an overflow happens.
2955 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2959 Version 1.29.0 (2018-09-13)
2960 ==========================
2964 - [Bumped minimum LLVM version to 5.0.][51899]
2965 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2966 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2967 - [Upgraded to LLVM 7.][51966]
2971 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2972 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2973 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2974 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2976 - [`Cell<T>` now allows `T` to be unsized.][50494]
2977 - [`SocketAddr` is now stable on Redox.][52656]
2982 - [`Iterator::flatten`]
2987 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2988 `--locked` to disable this behavior.
2989 - [`cargo-install` will now allow you to cross compile an install
2990 using `--target`.][cargo/5614]
2991 - [Added the `cargo-fix` subcommand to automatically move project code from
2992 2015 edition to 2018.][cargo/5723]
2993 - [`cargo doc` can now optionally document private types using the
2994 `--document-private-items` flag.][cargo/5543]
2998 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2999 the specified level to that level.][52354] For example `--cap-lints warn`
3000 will demote `deny` and `forbid` lints to `warn`.
3001 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3002 fails and `101` if there is a panic.][52197]
3003 - [A preview of clippy has been made available through rustup.][51122]
3004 You can install the preview with `rustup component add clippy-preview`.
3008 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3009 Use `str::get_unchecked(begin..end)` instead.
3010 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3011 Consider using the `home_dir` function from
3012 https://crates.io/crates/dirs instead.
3013 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3014 - [`cfg` attributes and `--cfg` command line flags are now more
3015 strictly validated.][53893]
3017 [53893]: https://github.com/rust-lang/rust/pull/53893/
3018 [52861]: https://github.com/rust-lang/rust/pull/52861/
3019 [51966]: https://github.com/rust-lang/rust/pull/51966/
3020 [52656]: https://github.com/rust-lang/rust/pull/52656/
3021 [52239]: https://github.com/rust-lang/rust/pull/52239/
3022 [52330]: https://github.com/rust-lang/rust/pull/52330/
3023 [52354]: https://github.com/rust-lang/rust/pull/52354/
3024 [52402]: https://github.com/rust-lang/rust/pull/52402/
3025 [52103]: https://github.com/rust-lang/rust/pull/52103/
3026 [52197]: https://github.com/rust-lang/rust/pull/52197/
3027 [51807]: https://github.com/rust-lang/rust/pull/51807/
3028 [51899]: https://github.com/rust-lang/rust/pull/51899/
3029 [51912]: https://github.com/rust-lang/rust/pull/51912/
3030 [51511]: https://github.com/rust-lang/rust/pull/51511/
3031 [51619]: https://github.com/rust-lang/rust/pull/51619/
3032 [51656]: https://github.com/rust-lang/rust/pull/51656/
3033 [51178]: https://github.com/rust-lang/rust/pull/51178/
3034 [51122]: https://github.com/rust-lang/rust/pull/51122
3035 [50494]: https://github.com/rust-lang/rust/pull/50494/
3036 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3037 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3038 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3039 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3040 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3041 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3042 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3045 Version 1.28.0 (2018-08-02)
3046 ===========================
3050 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3051 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3052 the inner type across Foreign Function Interface (FFI) boundaries.
3053 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3054 and can now be used as identifiers.][51196]
3055 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3056 stable.][51241] This will allow users to specify a global allocator for
3058 - [Unit test functions marked with the `#[test]` attribute can now return
3059 `Result<(), E: Debug>` in addition to `()`.][51298]
3060 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3061 allows macros to easily target lifetimes.
3065 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3066 prioritise making smaller binary sizes. `z` is the same as `s` with the
3067 exception that it does not vectorise loops, which typically results in an even
3069 - [The short error format is now stable.][49546] Specified with
3070 `--error-format=short` this option will provide a more compressed output of
3071 rust error messages.
3072 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3073 - [Reduced the number of allocations in the macro parser.][50855] This can
3074 improve compile times of macro heavy crates on average by 5%.
3078 - [Implemented `Default` for `&mut str`.][51306]
3079 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3080 - [Implemented `Extend` for `()`.][50234]
3081 - [The `Debug` implementation of `time::Duration` should now be more easily
3082 human readable.][50364] Previously a `Duration` of one second would printed as
3083 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3084 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3085 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3086 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3087 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3088 for `PathBuf`.][50170]
3089 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3090 and `Wrapping<i128>`.][50465]
3091 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3092 possible.][51050] This can provide up to a 40% speed increase.
3093 - [Improved error messages when using `format!`.][50610]
3097 - [`Iterator::step_by`]
3098 - [`Path::ancestors`]
3099 - [`SystemTime::UNIX_EPOCH`]
3100 - [`alloc::GlobalAlloc`]
3102 - [`alloc::LayoutErr`]
3105 - [`alloc::alloc_zeroed`]
3106 - [`alloc::dealloc`]
3107 - [`alloc::realloc`]
3108 - [`alloc::handle_alloc_error`]
3109 - [`btree_map::Entry::or_default`]
3110 - [`fmt::Alignment`]
3111 - [`hash_map::Entry::or_default`]
3112 - [`iter::repeat_with`]
3113 - [`num::NonZeroUsize`]
3114 - [`num::NonZeroU128`]
3115 - [`num::NonZeroU16`]
3116 - [`num::NonZeroU32`]
3117 - [`num::NonZeroU64`]
3118 - [`num::NonZeroU8`]
3119 - [`ops::RangeBounds`]
3120 - [`slice::SliceIndex`]
3121 - [`slice::from_mut`]
3122 - [`slice::from_ref`]
3123 - [`{Any + Send + Sync}::downcast_mut`]
3124 - [`{Any + Send + Sync}::downcast_ref`]
3125 - [`{Any + Send + Sync}::is`]
3129 - [Cargo will now no longer allow you to publish crates with build scripts that
3130 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3131 considered to be immutable.
3135 - [The `suggestion_applicability` field in `rustc`'s json output is now
3136 stable.][50486] This will allow dev tools to check whether a code suggestion
3137 would apply to them.
3141 - [Rust will consider trait objects with duplicated constraints to be the same
3142 type as without the duplicated constraint.][51276] For example the below code will
3143 now fail to compile.
3148 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3151 impl Trait + Send + Send {
3152 fn test(&self) { println!("two"); }
3156 [49546]: https://github.com/rust-lang/rust/pull/49546/
3157 [50143]: https://github.com/rust-lang/rust/pull/50143/
3158 [50170]: https://github.com/rust-lang/rust/pull/50170/
3159 [50234]: https://github.com/rust-lang/rust/pull/50234/
3160 [50265]: https://github.com/rust-lang/rust/pull/50265/
3161 [50364]: https://github.com/rust-lang/rust/pull/50364/
3162 [50385]: https://github.com/rust-lang/rust/pull/50385/
3163 [50465]: https://github.com/rust-lang/rust/pull/50465/
3164 [50486]: https://github.com/rust-lang/rust/pull/50486/
3165 [50554]: https://github.com/rust-lang/rust/pull/50554/
3166 [50610]: https://github.com/rust-lang/rust/pull/50610/
3167 [50855]: https://github.com/rust-lang/rust/pull/50855/
3168 [51050]: https://github.com/rust-lang/rust/pull/51050/
3169 [51196]: https://github.com/rust-lang/rust/pull/51196/
3170 [51200]: https://github.com/rust-lang/rust/pull/51200/
3171 [51241]: https://github.com/rust-lang/rust/pull/51241/
3172 [51276]: https://github.com/rust-lang/rust/pull/51276/
3173 [51298]: https://github.com/rust-lang/rust/pull/51298/
3174 [51306]: https://github.com/rust-lang/rust/pull/51306/
3175 [51562]: https://github.com/rust-lang/rust/pull/51562/
3176 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3177 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3178 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3179 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3180 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3181 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3182 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3183 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3184 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3185 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3186 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3187 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3188 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3189 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3190 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3191 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3192 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3193 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3194 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3195 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3196 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3197 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3198 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3199 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3200 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3201 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3202 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3203 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3204 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3205 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3207 Version 1.27.2 (2018-07-20)
3208 ===========================
3213 - The borrow checker was fixed to avoid potential unsoundness when using
3214 match ergonomics: [#52213][52213].
3216 [52213]: https://github.com/rust-lang/rust/issues/52213
3218 Version 1.27.1 (2018-07-10)
3219 ===========================
3224 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3225 when running, which enabled executing code as some other user on a
3226 given machine. This release fixes that vulnerability; you can read
3227 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3229 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3234 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3235 match ergonomics: [#51415][51415], [#49534][49534].
3237 [51415]: https://github.com/rust-lang/rust/issues/51415
3238 [49534]: https://github.com/rust-lang/rust/issues/49534
3239 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3240 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3242 Version 1.27.0 (2018-06-21)
3243 ==========================
3247 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3248 be used as an identifier.
3249 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3250 bare `Trait` syntax, and should make it clearer when being used in tandem with
3251 `impl Trait` because it is equivalent to the following syntax:
3252 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3253 `Box<Trait> == Box<dyn Trait>`.
3254 - [Attributes on generic parameters such as types and lifetimes are
3255 now stable.][48851] e.g.
3256 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3257 - [The `#[must_use]` attribute can now also be used on functions as well as
3258 types.][48925] It provides a lint that by default warns users when the
3259 value returned by a function has not been used.
3263 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3267 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3268 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3269 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3270 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3271 the `cfg` attribute.
3272 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3273 std are now available in core.][49896]
3274 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3276 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3277 that the operation isn't done in place.
3278 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3279 the `#[must_use]` attribute][49533] to warn about unused potentially
3280 expensive allocations.
3284 - [`DoubleEndedIterator::rfind`]
3285 - [`DoubleEndedIterator::rfold`]
3286 - [`DoubleEndedIterator::try_rfold`]
3287 - [`Duration::from_micros`]
3288 - [`Duration::from_nanos`]
3289 - [`Duration::subsec_micros`]
3290 - [`Duration::subsec_millis`]
3291 - [`HashMap::remove_entry`]
3292 - [`Iterator::try_fold`]
3293 - [`Iterator::try_for_each`]
3295 - [`Option::filter`]
3296 - [`String::replace_range`]
3297 - [`Take::set_limit`]
3298 - [`hint::unreachable_unchecked`]
3299 - [`os::unix::process::parent_id`]
3300 - [`ptr::swap_nonoverlapping`]
3301 - [`slice::rsplit_mut`]
3303 - [`slice::swap_with_slice`]
3307 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3308 `readme`, and `repository` fields.][cargo/5386]
3309 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3310 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3311 a different directory than `target` for placing compilation artifacts.
3312 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3313 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3314 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3315 where cargo would infer a binary, Cargo will produce a warning. You can
3316 disable this feature ahead of time by setting any of the following to false:
3317 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3318 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3319 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3323 - [Added “The Rustc book” into the official documentation.][49707]
3324 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3325 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3329 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3330 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3331 compile, `"".is_empty()` will still compile.
3332 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3333 will only print the inner type.][48553] E.g.
3334 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3335 not `AtomicBool(true)`.
3336 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3337 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3338 alignment should cover all use cases.
3339 - The `.description()` method on the `std::error::Error` trait
3340 [has been soft-deprecated][50163]. It is no longer required to implement it.
3342 [48553]: https://github.com/rust-lang/rust/pull/48553/
3343 [48851]: https://github.com/rust-lang/rust/pull/48851/
3344 [48925]: https://github.com/rust-lang/rust/pull/48925/
3345 [49533]: https://github.com/rust-lang/rust/pull/49533/
3346 [49623]: https://github.com/rust-lang/rust/pull/49623/
3347 [49630]: https://github.com/rust-lang/rust/pull/49630/
3348 [49664]: https://github.com/rust-lang/rust/pull/49664/
3349 [49699]: https://github.com/rust-lang/rust/pull/49699/
3350 [49707]: https://github.com/rust-lang/rust/pull/49707/
3351 [49719]: https://github.com/rust-lang/rust/pull/49719/
3352 [49896]: https://github.com/rust-lang/rust/pull/49896/
3353 [49968]: https://github.com/rust-lang/rust/pull/49968/
3354 [50163]: https://github.com/rust-lang/rust/pull/50163
3355 [50177]: https://github.com/rust-lang/rust/pull/50177/
3356 [50378]: https://github.com/rust-lang/rust/pull/50378/
3357 [50398]: https://github.com/rust-lang/rust/pull/50398/
3358 [50423]: https://github.com/rust-lang/rust/pull/50423/
3359 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3360 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3361 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3362 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3363 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3364 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3365 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3366 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3367 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3368 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3369 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3370 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3371 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3372 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3373 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3374 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3375 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3376 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3377 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3378 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3379 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3380 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3381 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3382 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3383 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3384 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3385 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3386 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3387 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3388 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3391 Version 1.26.2 (2018-06-05)
3392 ==========================
3397 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3399 [51117]: https://github.com/rust-lang/rust/issues/51117
3402 Version 1.26.1 (2018-05-29)
3403 ==========================
3408 - [RLS now works on Windows.][50646]
3409 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3415 - [`fn main() -> impl Trait` no longer works for non-Termination
3417 This reverts an accidental stabilization.
3418 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3419 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3421 [50646]: https://github.com/rust-lang/rust/issues/50646
3422 [50656]: https://github.com/rust-lang/rust/pull/50656
3423 [50812]: https://github.com/rust-lang/rust/pull/50812
3424 [50950]: https://github.com/rust-lang/rust/issues/50950
3425 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3427 Version 1.26.0 (2018-05-10)
3428 ==========================
3432 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3433 implement either or both traits.][49299]
3434 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3435 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3436 lifetime can be elided.][49458]
3437 - [`impl Trait` is now stable allowing you to have abstract types in returns
3438 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3439 `fn open(path: impl AsRef<Path>)`.
3440 - [Pattern matching will now automatically apply dereferences.][49394]
3441 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3442 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3443 - [A lot of operations are now available in a const context.][46882] E.g. You
3444 can now index into constant arrays, reference and dereference into constants,
3445 and use tuple struct constructors.
3446 - [Fixed entry slice patterns are now stable.][48516] E.g.
3448 let points = [1, 2, 3, 4];
3450 [1, 2, 3, 4] => println!("All points were sequential."),
3451 _ => println!("Not all points were sequential."),
3458 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3459 - [Fixed exponential projection complexity on nested types.][48296]
3460 This can provide up to a ~12% reduction in compile times for certain crates.
3461 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3462 to remap path prefixes outputted by the compiler.
3463 - [Added `powerpc-unknown-netbsd` target.][48281]
3467 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3468 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3469 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3470 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3471 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3472 - [`ascii::escape_default` is now available in libcore.][48735]
3473 - [Trailing commas are now supported in std and core macros.][48056]
3474 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3475 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3480 - [`*const T::copy_to_nonoverlapping`]
3481 - [`*const T::copy_to`]
3482 - [`*const T::read_unaligned`]
3483 - [`*const T::read_volatile`]
3484 - [`*const T::read`]
3486 - [`*const T::wrapping_add`]
3487 - [`*const T::wrapping_sub`]
3489 - [`*mut T::copy_to_nonoverlapping`]
3490 - [`*mut T::copy_to`]
3491 - [`*mut T::read_unaligned`]
3492 - [`*mut T::read_volatile`]
3494 - [`*mut T::replace`]
3497 - [`*mut T::wrapping_add`]
3498 - [`*mut T::wrapping_sub`]
3499 - [`*mut T::write_bytes`]
3500 - [`*mut T::write_unaligned`]
3501 - [`*mut T::write_volatile`]
3504 - [`FromUtf8Error::as_bytes`]
3505 - [`LocalKey::try_with`]
3506 - [`Option::cloned`]
3507 - [`btree_map::Entry::and_modify`]
3508 - [`fs::read_to_string`]
3511 - [`hash_map::Entry::and_modify`]
3512 - [`iter::FusedIterator`]
3513 - [`ops::RangeInclusive`]
3514 - [`ops::RangeToInclusive`]
3516 - [`slice::rotate_left`]
3517 - [`slice::rotate_right`]
3518 - [`String::retain`]
3523 - [Cargo will now output path to custom commands when `-v` is
3524 passed with `--list`][cargo/5041]
3525 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3529 - [The second edition of "The Rust Programming Language" book is now recommended
3530 over the first.][48404]
3535 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3536 syntax is now invalid.
3538 use std::ops::Fn as dyn;
3539 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3541 - [The result of dereferences are no longer promoted to `'static`.][47408]
3545 const PAIR: &(i32, i32) = &(0, 1);
3546 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3549 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3550 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3552 - [Removed hoedown from rustdoc.][48274]
3553 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3555 [46882]: https://github.com/rust-lang/rust/pull/46882
3556 [47379]: https://github.com/rust-lang/rust/pull/47379
3557 [47408]: https://github.com/rust-lang/rust/pull/47408
3558 [47813]: https://github.com/rust-lang/rust/pull/47813
3559 [48056]: https://github.com/rust-lang/rust/pull/48056
3560 [48125]: https://github.com/rust-lang/rust/pull/48125
3561 [48166]: https://github.com/rust-lang/rust/pull/48166
3562 [48235]: https://github.com/rust-lang/rust/pull/48235
3563 [48274]: https://github.com/rust-lang/rust/pull/48274
3564 [48281]: https://github.com/rust-lang/rust/pull/48281
3565 [48296]: https://github.com/rust-lang/rust/pull/48296
3566 [48326]: https://github.com/rust-lang/rust/pull/48326
3567 [48359]: https://github.com/rust-lang/rust/pull/48359
3568 [48404]: https://github.com/rust-lang/rust/pull/48404
3569 [48481]: https://github.com/rust-lang/rust/pull/48481
3570 [48516]: https://github.com/rust-lang/rust/pull/48516
3571 [48628]: https://github.com/rust-lang/rust/pull/48628
3572 [48629]: https://github.com/rust-lang/rust/pull/48629
3573 [48657]: https://github.com/rust-lang/rust/pull/48657
3574 [48735]: https://github.com/rust-lang/rust/pull/48735
3575 [48978]: https://github.com/rust-lang/rust/pull/48978
3576 [49101]: https://github.com/rust-lang/rust/pull/49101
3577 [49109]: https://github.com/rust-lang/rust/pull/49109
3578 [49121]: https://github.com/rust-lang/rust/pull/49121
3579 [49162]: https://github.com/rust-lang/rust/pull/49162
3580 [49184]: https://github.com/rust-lang/rust/pull/49184
3581 [49234]: https://github.com/rust-lang/rust/pull/49234
3582 [49255]: https://github.com/rust-lang/rust/pull/49255
3583 [49299]: https://github.com/rust-lang/rust/pull/49299
3584 [49305]: https://github.com/rust-lang/rust/pull/49305
3585 [49394]: https://github.com/rust-lang/rust/pull/49394
3586 [49458]: https://github.com/rust-lang/rust/pull/49458
3587 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3588 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3589 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3590 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3591 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3592 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3593 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3594 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3595 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3596 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3597 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3598 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3599 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3600 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3601 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3602 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3603 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3604 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3605 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3606 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3607 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3608 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3609 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3610 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3611 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3612 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3613 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3614 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3615 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3616 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3617 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3618 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3619 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3620 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3621 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3622 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3623 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3624 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3625 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3626 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3627 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3628 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3631 Version 1.25.0 (2018-03-29)
3632 ==========================
3636 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3637 - [You can now use nested groups of imports.][47948]
3638 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3639 - [You can now have `|` at the start of a match arm.][47947] e.g.
3641 enum Foo { A, B, C }
3647 | Foo::B => println!("AB"),
3648 | Foo::C => println!("C"),
3655 - [Upgraded to LLVM 6.][47828]
3656 - [Added `-C lto=val` option.][47521]
3657 - [Added `i586-unknown-linux-musl` target][47282]
3661 - [Impl Send for `process::Command` on Unix.][47760]
3662 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3663 - [`UnsafeCell::into_inner` is now safe.][47204]
3664 - [Implement libstd for CloudABI.][47268]
3665 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3666 - [Implement `AsRef<Path>` for Component][46985]
3667 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3668 - [Moved `Duration` to libcore.][46666]
3672 - [`Location::column`]
3675 The following functions can now be used in a constant expression.
3676 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3677 - [`Duration::new`][47300]
3678 - [`Duration::from_secs`][47300]
3679 - [`Duration::from_millis`][47300]
3683 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3684 - [`cargo new` now defaults to creating a binary crate, instead of a
3685 library crate.][cargo/5029]
3689 - [Rust by example is now shipped with new releases][46196]
3693 - [Deprecated `net::lookup_host`.][47510]
3694 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3695 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3696 around indexing operations (see [#47349][47349]). This has been fixed (which also
3697 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3698 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3700 [33903]: https://github.com/rust-lang/rust/pull/33903
3701 [47947]: https://github.com/rust-lang/rust/pull/47947
3702 [47948]: https://github.com/rust-lang/rust/pull/47948
3703 [47760]: https://github.com/rust-lang/rust/pull/47760
3704 [47790]: https://github.com/rust-lang/rust/pull/47790
3705 [47828]: https://github.com/rust-lang/rust/pull/47828
3706 [47398]: https://github.com/rust-lang/rust/pull/47398
3707 [47510]: https://github.com/rust-lang/rust/pull/47510
3708 [47521]: https://github.com/rust-lang/rust/pull/47521
3709 [47204]: https://github.com/rust-lang/rust/pull/47204
3710 [47251]: https://github.com/rust-lang/rust/pull/47251
3711 [47268]: https://github.com/rust-lang/rust/pull/47268
3712 [47282]: https://github.com/rust-lang/rust/pull/47282
3713 [47300]: https://github.com/rust-lang/rust/pull/47300
3714 [47349]: https://github.com/rust-lang/rust/pull/47349
3715 [46931]: https://github.com/rust-lang/rust/pull/46931
3716 [46985]: https://github.com/rust-lang/rust/pull/46985
3717 [47006]: https://github.com/rust-lang/rust/pull/47006
3718 [46830]: https://github.com/rust-lang/rust/pull/46830
3719 [46095]: https://github.com/rust-lang/rust/pull/46095
3720 [46666]: https://github.com/rust-lang/rust/pull/46666
3721 [46196]: https://github.com/rust-lang/rust/pull/46196
3722 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3723 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3724 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3725 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3726 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3729 Version 1.24.1 (2018-03-01)
3730 ==========================
3732 - [Do not abort when unwinding through FFI][48251]
3733 - [Emit UTF-16 files for linker arguments on Windows][48318]
3734 - [Make the error index generator work again][48308]
3735 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3737 [48251]: https://github.com/rust-lang/rust/issues/48251
3738 [48308]: https://github.com/rust-lang/rust/issues/48308
3739 [48318]: https://github.com/rust-lang/rust/issues/48318
3740 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3743 Version 1.24.0 (2018-02-15)
3744 ==========================
3748 - [External `sysv64` ffi is now available.][46528]
3749 eg. `extern "sysv64" fn foo () {}`
3753 - [rustc now uses 16 codegen units by default for release builds.][46910]
3754 For the fastest builds, utilize `codegen-units=1`.
3755 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3756 - [Add `aarch64-unknown-openbsd` support][46760]
3760 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3761 improvement in performance in the majority of cases.
3762 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3763 with Windows.][46798]
3764 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3765 - [impl `From<bool>` for `AtomicBool`][46293]
3766 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3767 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3768 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3769 - [float::from_bits now just uses transmute.][46012] This provides
3770 some optimisations from LLVM.
3771 - [Copied `AsciiExt` methods onto `char`][46077]
3772 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3773 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3774 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3775 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3779 - [`RefCell::replace`]
3781 - [`atomic::spin_loop_hint`]
3783 The following functions can now be used in a constant expression.
3784 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3786 - [`AtomicBool::new`][46287]
3787 - [`AtomicUsize::new`][46287]
3788 - [`AtomicIsize::new`][46287]
3789 - [`AtomicPtr::new`][46287]
3790 - [`Cell::new`][46287]
3791 - [`{integer}::min_value`][46287]
3792 - [`{integer}::max_value`][46287]
3793 - [`mem::size_of`][46287]
3794 - [`mem::align_of`][46287]
3795 - [`ptr::null`][46287]
3796 - [`ptr::null_mut`][46287]
3797 - [`RefCell::new`][46287]
3798 - [`UnsafeCell::new`][46287]
3802 - [Added a `workspace.default-members` config that
3803 overrides implied `--all` in virtual workspaces.][cargo/4743]
3804 - [Enable incremental by default on development builds.][cargo/4817] Also added
3805 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3806 per-project or global basis respectively.
3813 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3814 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3815 in accordance with IETF RFC 4291 §2.2.
3816 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3817 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3818 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3819 - [Leading zeros in tuple struct members is now an error][47084]
3820 - [`column!()` macro is one-based instead of zero-based][46977]
3821 - [`fmt::Arguments` can no longer be shared across threads][45198]
3822 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3823 - [Cargo sets a different working directory for the compiler][cargo/4788]
3825 [44884]: https://github.com/rust-lang/rust/pull/44884
3826 [45198]: https://github.com/rust-lang/rust/pull/45198
3827 [45506]: https://github.com/rust-lang/rust/pull/45506
3828 [45904]: https://github.com/rust-lang/rust/pull/45904
3829 [45990]: https://github.com/rust-lang/rust/pull/45990
3830 [46012]: https://github.com/rust-lang/rust/pull/46012
3831 [46077]: https://github.com/rust-lang/rust/pull/46077
3832 [46094]: https://github.com/rust-lang/rust/pull/46094
3833 [46284]: https://github.com/rust-lang/rust/pull/46284
3834 [46287]: https://github.com/rust-lang/rust/pull/46287
3835 [46293]: https://github.com/rust-lang/rust/pull/46293
3836 [46528]: https://github.com/rust-lang/rust/pull/46528
3837 [46671]: https://github.com/rust-lang/rust/pull/46671
3838 [46713]: https://github.com/rust-lang/rust/pull/46713
3839 [46735]: https://github.com/rust-lang/rust/pull/46735
3840 [46749]: https://github.com/rust-lang/rust/pull/46749
3841 [46760]: https://github.com/rust-lang/rust/pull/46760
3842 [46798]: https://github.com/rust-lang/rust/pull/46798
3843 [46828]: https://github.com/rust-lang/rust/pull/46828
3844 [46831]: https://github.com/rust-lang/rust/pull/46831
3845 [46833]: https://github.com/rust-lang/rust/pull/46833
3846 [46910]: https://github.com/rust-lang/rust/pull/46910
3847 [46977]: https://github.com/rust-lang/rust/pull/46977
3848 [47018]: https://github.com/rust-lang/rust/pull/47018
3849 [47080]: https://github.com/rust-lang/rust/pull/47080
3850 [47084]: https://github.com/rust-lang/rust/pull/47084
3851 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3852 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3853 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3854 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3855 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3856 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3859 Version 1.23.0 (2018-01-04)
3860 ==========================
3864 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3865 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3866 Which should fix some confusing errors in some operations.
3870 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3871 undefined behavior.][45920]
3872 - [rustc now suggests renaming import if names clash.][45660]
3873 - [Display errors/warnings correctly when there are zero-width or
3874 wide characters.][45711]
3875 - [rustc now avoids unnecessary copies of arguments that are
3876 simple bindings][45380] This should improve memory usage on average by 5-10%.
3877 - [Updated musl used to build musl rustc to 1.1.17][45393]
3881 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3882 - [Implement Hash for raw pointers to unsized types][45483]
3883 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3884 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3885 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3886 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3887 and `<*mut T>::as_mut`][44932]
3888 - [Optimized `Thread::{park, unpark}` implementation][45524]
3889 - [Improved `SliceExt::binary_search` performance.][45333]
3890 - [impl `FromIterator<()>` for `()`][45379]
3891 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3899 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3900 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3901 - [Added unit test checking to `cargo check`][cargo/4592]
3902 - [Cargo now lets you install a specific version
3903 using `cargo install --version`][cargo/4637]
3907 - [Releases now ship with the Cargo book documentation.][45692]
3908 - [rustdoc now prints rendering warnings on every run.][45324]
3912 - [Changes have been made to type equality to make it more correct,
3913 in rare cases this could break some code.][45853] [Tracking issue for
3914 further information][45852]
3915 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3916 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3917 Android 9, the minimum supported version is Android 14.
3918 - [Bumped the minimum LLVM to 3.9][45326]
3920 [44042]: https://github.com/rust-lang/rust/pull/44042
3921 [44932]: https://github.com/rust-lang/rust/pull/44932
3922 [45267]: https://github.com/rust-lang/rust/pull/45267
3923 [45324]: https://github.com/rust-lang/rust/pull/45324
3924 [45326]: https://github.com/rust-lang/rust/pull/45326
3925 [45333]: https://github.com/rust-lang/rust/pull/45333
3926 [45379]: https://github.com/rust-lang/rust/pull/45379
3927 [45380]: https://github.com/rust-lang/rust/pull/45380
3928 [45393]: https://github.com/rust-lang/rust/pull/45393
3929 [45435]: https://github.com/rust-lang/rust/pull/45435
3930 [45483]: https://github.com/rust-lang/rust/pull/45483
3931 [45524]: https://github.com/rust-lang/rust/pull/45524
3932 [45571]: https://github.com/rust-lang/rust/pull/45571
3933 [45580]: https://github.com/rust-lang/rust/pull/45580
3934 [45610]: https://github.com/rust-lang/rust/pull/45610
3935 [45660]: https://github.com/rust-lang/rust/pull/45660
3936 [45692]: https://github.com/rust-lang/rust/pull/45692
3937 [45711]: https://github.com/rust-lang/rust/pull/45711
3938 [45772]: https://github.com/rust-lang/rust/pull/45772
3939 [45852]: https://github.com/rust-lang/rust/issues/45852
3940 [45853]: https://github.com/rust-lang/rust/pull/45853
3941 [45887]: https://github.com/rust-lang/rust/pull/45887
3942 [45920]: https://github.com/rust-lang/rust/pull/45920
3943 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3944 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3945 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3948 Version 1.22.1 (2017-11-22)
3949 ==========================
3951 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3953 [46183]: https://github.com/rust-lang/rust/pull/46183
3955 Version 1.22.0 (2017-11-22)
3956 ==========================
3960 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3961 - [Now accepts underscores in unicode escapes][43716]
3962 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3963 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3967 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3968 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3969 This should decrease compile times for debug builds.
3970 - [strict memory alignment now enabled on ARMv6][45094]
3971 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3975 - [Allow atomic operations up to 32 bits
3976 on `armv5te_unknown_linux_gnueabi`][44978]
3977 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3978 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3979 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3980 - [Properly detect overflow in `Instant += Duration`.][44220]
3981 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3982 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3983 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3990 - [Cargo will now build multi file examples in subdirectories of the `examples`
3991 folder that have a `main.rs` file.][cargo/4496]
3992 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3993 the old format will continue to work and can be updated with `cargo update`.
3994 - [Now supports vendoring git repositories][cargo/3992]
3998 - [`libbacktrace` is now available on Apple platforms.][44251]
3999 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4000 This now lets you specify that a given code example will fail to compile.
4004 - [The minimum Android version that rustc can build for has been bumped
4005 to `4.0` from `2.3`][45656]
4006 - [Allowing `T op= &T` for numeric types has broken some type
4007 inference cases][45480]
4010 [42526]: https://github.com/rust-lang/rust/pull/42526
4011 [43017]: https://github.com/rust-lang/rust/pull/43017
4012 [43716]: https://github.com/rust-lang/rust/pull/43716
4013 [43949]: https://github.com/rust-lang/rust/pull/43949
4014 [44015]: https://github.com/rust-lang/rust/pull/44015
4015 [44220]: https://github.com/rust-lang/rust/pull/44220
4016 [44251]: https://github.com/rust-lang/rust/pull/44251
4017 [44287]: https://github.com/rust-lang/rust/pull/44287
4018 [44303]: https://github.com/rust-lang/rust/pull/44303
4019 [44456]: https://github.com/rust-lang/rust/pull/44456
4020 [44466]: https://github.com/rust-lang/rust/pull/44466
4021 [44895]: https://github.com/rust-lang/rust/pull/44895
4022 [44966]: https://github.com/rust-lang/rust/pull/44966
4023 [44978]: https://github.com/rust-lang/rust/pull/44978
4024 [45041]: https://github.com/rust-lang/rust/pull/45041
4025 [45064]: https://github.com/rust-lang/rust/pull/45064
4026 [45075]: https://github.com/rust-lang/rust/pull/45075
4027 [45094]: https://github.com/rust-lang/rust/pull/45094
4028 [45095]: https://github.com/rust-lang/rust/pull/45095
4029 [45480]: https://github.com/rust-lang/rust/issues/45480
4030 [45656]: https://github.com/rust-lang/rust/pull/45656
4031 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4032 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4033 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4040 Version 1.21.0 (2017-10-12)
4041 ==========================
4045 - [You can now use static references for literals.][43838]
4049 let x: &'static u32 = &0;
4052 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4055 my_macro!(Vec<i32>::new); // Always worked
4056 my_macro!(Vec::<i32>::new); // Now works
4061 - [Upgraded jemalloc to 4.5.0][43911]
4062 - [Enabled unwinding panics on Redox][43917]
4063 - [Now runs LLVM in parallel during translation phase.][43506]
4064 This should reduce peak memory usage.
4068 - [Generate builtin impls for `Clone` for all arrays and tuples that
4069 are `T: Clone`][43690]
4070 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4071 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4072 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4077 [`std::mem::discriminant`]
4081 - [You can now call `cargo install` with multiple package names][cargo/4216]
4082 - [Cargo commands inside a virtual workspace will now implicitly
4083 pass `--all`][cargo/4335]
4084 - [Added a `[patch]` section to `Cargo.toml` to handle
4085 prepublication dependencies][cargo/4123] [RFC 1969]
4086 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4087 like patterns][cargo/4270]
4088 - [Added the `--all-targets` option][cargo/4400]
4089 - [Using required dependencies as a feature is now deprecated and emits
4090 a warning][cargo/4364]
4095 - [Cargo docs are moving][43916]
4096 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4097 - [The rustdoc book is now available][43863]
4098 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4099 - [Added a preview of RLS has been made available through rustup][44204]
4100 Install with `rustup component add rls-preview`
4101 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4102 Previously only showed `std::os::unix`.
4106 - [Changes in method matching against higher-ranked types][43880] This may cause
4107 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4108 - [rustc's JSON error output's byte position start at top of file.][42973]
4109 Was previously relative to the rustc's internal `CodeMap` struct which
4110 required the unstable library `libsyntax` to correctly use.
4111 - [`unused_results` lint no longer ignores booleans][43728]
4113 [42565]: https://github.com/rust-lang/rust/pull/42565
4114 [42973]: https://github.com/rust-lang/rust/pull/42973
4115 [43348]: https://github.com/rust-lang/rust/pull/43348
4116 [43459]: https://github.com/rust-lang/rust/pull/43459
4117 [43506]: https://github.com/rust-lang/rust/pull/43506
4118 [43540]: https://github.com/rust-lang/rust/pull/43540
4119 [43690]: https://github.com/rust-lang/rust/pull/43690
4120 [43728]: https://github.com/rust-lang/rust/pull/43728
4121 [43838]: https://github.com/rust-lang/rust/pull/43838
4122 [43863]: https://github.com/rust-lang/rust/pull/43863
4123 [43880]: https://github.com/rust-lang/rust/pull/43880
4124 [43911]: https://github.com/rust-lang/rust/pull/43911
4125 [43916]: https://github.com/rust-lang/rust/pull/43916
4126 [43917]: https://github.com/rust-lang/rust/pull/43917
4127 [44204]: https://github.com/rust-lang/rust/pull/44204
4128 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4129 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4130 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4131 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4132 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4133 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4134 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4135 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4136 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4138 Version 1.20.0 (2017-08-31)
4139 ===========================
4143 - [Associated constants are now stabilised.][42809]
4144 - [A lot of macro bugs are now fixed.][42913]
4149 - [Struct fields are now properly coerced to the expected field type.][42807]
4150 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4151 `wasm32-experimental-emscripten` target.
4152 - [Changed some of the error messages to be more helpful.][42033]
4153 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4155 - [rustc now reports the total number of errors on compilation failure][43015]
4156 previously this was only the number of errors in the pass that failed.
4157 - [Expansion in rustc has been sped up 29x.][42533]
4158 - [added `msp430-none-elf` target.][43099]
4159 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4161 - [Fixes backtraces on Redox][43228]
4162 - [rustc now identifies different versions of same crate when absolute paths of
4163 different types match in an error message.][42826]
4169 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4170 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4172 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4173 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4174 - [Impl `Clone` for `DefaultHasher`.][42799]
4175 - [Impl `Sync` for `SyncSender`.][42397]
4176 - [Impl `FromStr` for `char`][42271]
4177 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4179 - [allow messages in the `unimplemented!()` macro.][42155]
4180 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4181 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4182 - [Upgrade to Unicode 10.0.0][42999]
4183 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4184 - [Skip the main thread's manual stack guard on Linux][43072]
4185 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4186 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4188 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4193 - [`CStr::into_c_string`]
4194 - [`CString::as_c_str`]
4195 - [`CString::into_boxed_c_str`]
4196 - [`Chain::get_mut`]
4197 - [`Chain::get_ref`]
4198 - [`Chain::into_inner`]
4199 - [`Option::get_or_insert_with`]
4200 - [`Option::get_or_insert`]
4201 - [`OsStr::into_os_string`]
4202 - [`OsString::into_boxed_os_str`]
4205 - [`Utf8Error::error_len`]
4206 - [`char::EscapeDebug`]
4207 - [`char::escape_debug`]
4208 - [`compile_error!`]
4209 - [`f32::from_bits`]
4211 - [`f64::from_bits`]
4213 - [`mem::ManuallyDrop`]
4214 - [`slice::sort_unstable_by_key`]
4215 - [`slice::sort_unstable_by`]
4216 - [`slice::sort_unstable`]
4217 - [`str::from_boxed_utf8_unchecked`]
4218 - [`str::as_bytes_mut`]
4219 - [`str::as_bytes_mut`]
4220 - [`str::from_utf8_mut`]
4221 - [`str::from_utf8_unchecked_mut`]
4223 - [`str::get_unchecked_mut`]
4224 - [`str::get_unchecked`]
4226 - [`str::into_boxed_bytes`]
4231 - [Cargo API token location moved from `~/.cargo/config` to
4232 `~/.cargo/credentials`.][cargo/3978]
4233 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4234 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4235 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4236 - [You can now specify version of a binary when installed through
4237 `cargo install` using `--vers`.][cargo/4229]
4238 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4239 failure.][cargo/4248]
4240 - [Changed the convention around which file is the crate root.][cargo/4259]
4241 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4242 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4247 - [Functions with `'static` in their return types will now not be as usable as
4248 if they were using lifetime parameters instead.][42417]
4249 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4250 takes the sign of NaN into account where previously didn't.][42430]
4252 [42033]: https://github.com/rust-lang/rust/pull/42033
4253 [42155]: https://github.com/rust-lang/rust/pull/42155
4254 [42271]: https://github.com/rust-lang/rust/pull/42271
4255 [42397]: https://github.com/rust-lang/rust/pull/42397
4256 [42417]: https://github.com/rust-lang/rust/pull/42417
4257 [42430]: https://github.com/rust-lang/rust/pull/42430
4258 [42431]: https://github.com/rust-lang/rust/pull/42431
4259 [42533]: https://github.com/rust-lang/rust/pull/42533
4260 [42571]: https://github.com/rust-lang/rust/pull/42571
4261 [42613]: https://github.com/rust-lang/rust/pull/42613
4262 [42799]: https://github.com/rust-lang/rust/pull/42799
4263 [42807]: https://github.com/rust-lang/rust/pull/42807
4264 [42809]: https://github.com/rust-lang/rust/pull/42809
4265 [42822]: https://github.com/rust-lang/rust/pull/42822
4266 [42826]: https://github.com/rust-lang/rust/pull/42826
4267 [42854]: https://github.com/rust-lang/rust/pull/42854
4268 [42913]: https://github.com/rust-lang/rust/pull/42913
4269 [42999]: https://github.com/rust-lang/rust/pull/42999
4270 [43011]: https://github.com/rust-lang/rust/pull/43011
4271 [43015]: https://github.com/rust-lang/rust/pull/43015
4272 [43072]: https://github.com/rust-lang/rust/pull/43072
4273 [43077]: https://github.com/rust-lang/rust/pull/43077
4274 [43097]: https://github.com/rust-lang/rust/pull/43097
4275 [43099]: https://github.com/rust-lang/rust/pull/43099
4276 [43170]: https://github.com/rust-lang/rust/pull/43170
4277 [43178]: https://github.com/rust-lang/rust/pull/43178
4278 [43185]: https://github.com/rust-lang/rust/pull/43185
4279 [43228]: https://github.com/rust-lang/rust/pull/43228
4280 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4281 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4282 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4283 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4284 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4285 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4286 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4287 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4288 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4289 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4290 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4291 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4292 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4293 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4294 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4295 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4296 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4297 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4298 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4299 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4300 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4301 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4302 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4303 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4304 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4305 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4306 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4307 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4308 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4309 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4310 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4311 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4312 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4313 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4314 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4315 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4316 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4317 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4318 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4321 Version 1.19.0 (2017-07-20)
4322 ===========================
4327 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4328 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4329 - [Macro recursion limit increased to 1024 from 64.][41676]
4330 - [Added lint for detecting unused macros.][41907]
4331 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4332 For example: `let x = loop { break 7; };`
4333 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4334 contain `Copy` types and cannot have a `Drop` implementation.
4335 Example: `union Foo { bar: u8, baz: usize }`
4336 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4337 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4342 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4343 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4344 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4345 you should use `--target armv7-linux-androideabi`.
4346 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4347 - [Minor optimisation of string operations.][42037]
4348 - [Compiler error message is now `aborting due to previous error(s)` instead of
4349 `aborting due to N previous errors`][42150] This was previously inaccurate and
4350 would only count certain kinds of errors.
4351 - [The compiler now supports Visual Studio 2017][42225]
4352 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4353 - [Added a lot][42264] of [new error codes][42302]
4354 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4355 libraries with C Run-time Libraries(CRT) to be statically linked.
4356 - [Fixed various ARM codegen bugs][42740]
4361 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4362 `Extend<Cow<'a, str>>`][41449]
4363 - [`Vec` now implements `From<&mut [T]>`][41530]
4364 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4365 - [`SplitWhitespace` now implements `Clone`][41659]
4366 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4368 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4369 macros, but for printing to stderr.
4374 - [`OsString::shrink_to_fit`]
4377 - [`thread::ThreadId`]
4382 - [Build scripts can now add environment variables to the environment
4383 the crate is being compiled in.
4384 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4385 - [Subcommands now replace the current process rather than spawning a new
4386 child process][cargo/3970]
4387 - [Workspace members can now accept glob file patterns][cargo/3979]
4388 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4389 the members in a given workspace.][cargo/3988]
4390 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4391 - [Target directory path is now in the cargo metadata][cargo/4022]
4392 - [Cargo no longer checks out a local working directory for the
4393 crates.io index][cargo/4026] This should provide smaller file size for the
4394 registry, and improve cloning times, especially on Windows machines.
4395 - [Added an `--exclude` option for excluding certain packages when using the
4396 `--all` option][cargo/4031]
4397 - [Cargo will now automatically retry when receiving a 5xx error
4398 from crates.io][cargo/4032]
4399 - [The `--features` option now accepts multiple comma or space
4400 delimited values.][cargo/4084]
4401 - [Added support for custom target specific runners][cargo/3954]
4406 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4408 - [Rust will now release XZ compressed packages][rust-installer/57]
4409 - [rustup will now prefer to download rust packages with
4410 XZ compression][rustup/1100] over GZip packages.
4411 - [Added the ability to escape `#` in rust documentation][41785] By adding
4412 additional `#`'s ie. `##` is now `#`
4417 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4418 - [`-Z` flags are now no longer allowed to be used on the stable
4419 compiler.][41751] This has been a warning for a year previous to this.
4420 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4421 longer works][42844]. Users should migrate to the built-in `check`
4422 command, which has been available since 1.16.
4423 - [Ending a float literal with `._` is now a hard error.
4424 Example: `42._` .][41946]
4425 - [Any use of a private `extern crate` outside of its module is now a
4426 hard error.][36886] This was previously a warning.
4427 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4428 relative while the `::` prefix makes a path absolute, but was ignored and the
4429 path was relative regardless.
4430 - [Floating point constants in match patterns is now a hard error][36890]
4431 This was previously a warning.
4432 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4433 match patterns is now a hard error][36891] This was previously a warning.
4434 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4436 - [From the pound escape, lines consisting of multiple `#`s are
4438 - [It is an error to re-export private enum variants][42460]. This is
4439 known to break a number of crates that depend on an older version of
4441 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4442 to use it to find the linker, and the build will fail where it did
4443 not previously][42607]
4445 [36886]: https://github.com/rust-lang/rust/issues/36886
4446 [36888]: https://github.com/rust-lang/rust/issues/36888
4447 [36890]: https://github.com/rust-lang/rust/issues/36890
4448 [36891]: https://github.com/rust-lang/rust/issues/36891
4449 [36892]: https://github.com/rust-lang/rust/issues/36892
4450 [37406]: https://github.com/rust-lang/rust/issues/37406
4451 [39983]: https://github.com/rust-lang/rust/pull/39983
4452 [41145]: https://github.com/rust-lang/rust/pull/41145
4453 [41192]: https://github.com/rust-lang/rust/pull/41192
4454 [41258]: https://github.com/rust-lang/rust/pull/41258
4455 [41370]: https://github.com/rust-lang/rust/pull/41370
4456 [41449]: https://github.com/rust-lang/rust/pull/41449
4457 [41530]: https://github.com/rust-lang/rust/pull/41530
4458 [41624]: https://github.com/rust-lang/rust/pull/41624
4459 [41656]: https://github.com/rust-lang/rust/pull/41656
4460 [41659]: https://github.com/rust-lang/rust/pull/41659
4461 [41676]: https://github.com/rust-lang/rust/pull/41676
4462 [41751]: https://github.com/rust-lang/rust/pull/41751
4463 [41764]: https://github.com/rust-lang/rust/pull/41764
4464 [41785]: https://github.com/rust-lang/rust/pull/41785
4465 [41873]: https://github.com/rust-lang/rust/pull/41873
4466 [41907]: https://github.com/rust-lang/rust/pull/41907
4467 [41946]: https://github.com/rust-lang/rust/pull/41946
4468 [42016]: https://github.com/rust-lang/rust/pull/42016
4469 [42037]: https://github.com/rust-lang/rust/pull/42037
4470 [42068]: https://github.com/rust-lang/rust/pull/42068
4471 [42150]: https://github.com/rust-lang/rust/pull/42150
4472 [42162]: https://github.com/rust-lang/rust/pull/42162
4473 [42225]: https://github.com/rust-lang/rust/pull/42225
4474 [42264]: https://github.com/rust-lang/rust/pull/42264
4475 [42302]: https://github.com/rust-lang/rust/pull/42302
4476 [42460]: https://github.com/rust-lang/rust/issues/42460
4477 [42607]: https://github.com/rust-lang/rust/issues/42607
4478 [42740]: https://github.com/rust-lang/rust/pull/42740
4479 [42844]: https://github.com/rust-lang/rust/issues/42844
4480 [42948]: https://github.com/rust-lang/rust/pull/42948
4481 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4482 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4483 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4484 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4485 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4486 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4487 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4488 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4489 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4490 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4491 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4492 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4493 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4494 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4495 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4496 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4497 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4498 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4499 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4500 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4501 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4502 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4505 Version 1.18.0 (2017-06-08)
4506 ===========================
4511 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4512 make the item visible to just that module tree. Also accepts the keyword
4513 `crate` to make something public to the whole crate but not users of the
4514 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4515 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4516 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4517 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4518 types like `Write + Send`, trailing `+` are now supported in trait objects,
4519 and better error reporting for trait objects starting with `?Sized`.
4520 - [0e+10 is now a valid floating point literal][40589]
4521 - [Now warns if you bind a lifetime parameter to 'static][40734]
4522 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4523 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4524 representation in some cases.][40377]
4529 - [rustc can now emit mir with `--emit mir`][39891]
4530 - [Improved LLVM IR for trivial functions][40367]
4531 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4532 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4533 opportunities found through profiling
4534 - [Improved backtrace formatting when panicking][38165]
4539 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4540 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4541 iteration or reallocation.
4542 - [Simplified HashMap Bucket interface][40561] provides performance
4543 improvements for iterating and cloning.
4544 - [Specialize Vec::from_elem to use calloc][40409]
4545 - [Fixed Race condition in fs::create_dir_all][39799]
4546 - [No longer caching stdio on Windows][40516]
4547 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4548 2.50%~ faster and in one case now 12.50% faster.
4549 - [Optimized `AtomicBool::fetch_nand`][41143]
4554 - [`Child::try_wait`]
4555 - [`HashMap::retain`]
4556 - [`HashSet::retain`]
4558 - [`TcpStream::peek`]
4559 - [`UdpSocket::peek`]
4560 - [`UdpSocket::peek_from`]
4565 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4566 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4567 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4568 - [Added Android build support][cargo/3885]
4569 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4570 of a certain type, for example `cargo build --bins` will build all
4572 - [Added support for haiku][cargo/3952]
4577 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4578 - [Added rust-windbg script for better debugging on Windows][39983]
4579 - [Rust now uses the official cross compiler for NetBSD][40612]
4580 - [rustdoc now accepts `#` at the start of files][40828]
4581 - [Fixed jemalloc support for musl][41168]
4586 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4587 always placed after the sign if it exists and before the digits. With the `#`
4588 flag the zeroes are placed after the prefix and before the digits.
4589 - [Due to the struct field optimisation][40377], using `transmute` on structs
4590 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4591 always been undefined behavior, but is now more likely to break in practice.
4592 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4593 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4594 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4595 - [Overlapping inherent `impl`s are now a hard error][40728]
4596 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4597 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4598 `out.asm` and `out.ll` instead of only one of the filetypes.
4599 - [ calling a function that returns `Self` will no longer work][41805] when
4600 the size of `Self` cannot be statically determined.
4601 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4602 this has caused a few regressions namely:
4604 - Changed the link order of local static/dynamic libraries (respecting the
4605 order on given rather than having the compiler reorder).
4606 - Changed how MinGW is linked, native code linked to dynamic libraries
4607 may require manually linking to the gcc support library (for the native
4610 [38165]: https://github.com/rust-lang/rust/pull/38165
4611 [39799]: https://github.com/rust-lang/rust/pull/39799
4612 [39891]: https://github.com/rust-lang/rust/pull/39891
4613 [39983]: https://github.com/rust-lang/rust/pull/39983
4614 [40043]: https://github.com/rust-lang/rust/pull/40043
4615 [40241]: https://github.com/rust-lang/rust/pull/40241
4616 [40338]: https://github.com/rust-lang/rust/pull/40338
4617 [40367]: https://github.com/rust-lang/rust/pull/40367
4618 [40377]: https://github.com/rust-lang/rust/pull/40377
4619 [40409]: https://github.com/rust-lang/rust/pull/40409
4620 [40516]: https://github.com/rust-lang/rust/pull/40516
4621 [40556]: https://github.com/rust-lang/rust/pull/40556
4622 [40561]: https://github.com/rust-lang/rust/pull/40561
4623 [40589]: https://github.com/rust-lang/rust/pull/40589
4624 [40612]: https://github.com/rust-lang/rust/pull/40612
4625 [40723]: https://github.com/rust-lang/rust/pull/40723
4626 [40728]: https://github.com/rust-lang/rust/pull/40728
4627 [40731]: https://github.com/rust-lang/rust/pull/40731
4628 [40734]: https://github.com/rust-lang/rust/pull/40734
4629 [40805]: https://github.com/rust-lang/rust/pull/40805
4630 [40807]: https://github.com/rust-lang/rust/pull/40807
4631 [40828]: https://github.com/rust-lang/rust/pull/40828
4632 [40870]: https://github.com/rust-lang/rust/pull/40870
4633 [41085]: https://github.com/rust-lang/rust/pull/41085
4634 [41143]: https://github.com/rust-lang/rust/pull/41143
4635 [41168]: https://github.com/rust-lang/rust/pull/41168
4636 [41270]: https://github.com/rust-lang/rust/issues/41270
4637 [41469]: https://github.com/rust-lang/rust/pull/41469
4638 [41805]: https://github.com/rust-lang/rust/issues/41805
4639 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4640 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4641 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4642 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4643 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4644 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4645 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4646 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4647 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4648 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4649 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4650 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4651 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4652 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4655 Version 1.17.0 (2017-04-27)
4656 ===========================
4661 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4662 * [Fields of structs may be initialized without duplicating the field/variable
4663 names][39761]. [RFC 1682]
4664 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4665 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4666 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4667 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4668 `'b`. Soundness fix.
4669 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4670 * [Static variables may contain references to other statics][40027]
4675 * [Exit quickly on only `--emit dep-info`][40336]
4676 * [Make `-C relocation-model` more correctly determine whether the linker
4677 creates a position-independent executable][40245]
4678 * [Add `-C overflow-checks` to directly control whether integer overflow
4680 * [The rustc type checker now checks items on demand instead of in a single
4681 in-order pass][40008]. This is mostly an internal refactoring in support of
4682 future work, including incremental type checking, but also resolves [RFC
4683 1647], allowing `Self` to appear in `impl` `where` clauses.
4684 * [Optimize vtable loads][39995]
4685 * [Turn off vectorization for Emscripten targets][39990]
4686 * [Provide suggestions for unknown macros imported with `use`][39953]
4687 * [Fix ICEs in path resolution][39939]
4688 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4689 * [Add clearer error message using `&str + &str`][39116]
4700 * [`Ordering::then`]
4701 * [`Ordering::then_with`]
4702 * [`BTreeMap::range`]
4703 * [`BTreeMap::range_mut`]
4704 * [`collections::Bound`]
4705 * [`process::abort`]
4706 * [`ptr::read_unaligned`]
4707 * [`ptr::write_unaligned`]
4708 * [`Result::expect_err`]
4711 * [`Cell::into_inner`]
4717 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4718 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4719 * [`String` implements `FromIterator<&char>`][40028]
4720 * `Box` [implements][40009] a number of new conversions:
4721 `From<Box<str>> for String`,
4722 `From<Box<[T]>> for Vec<T>`,
4723 `From<Box<CStr>> for CString`,
4724 `From<Box<OsStr>> for OsString`,
4725 `From<Box<Path>> for PathBuf`,
4726 `Into<Box<str>> for String`,
4727 `Into<Box<[T]>> for Vec<T>`,
4728 `Into<Box<CStr>> for CString`,
4729 `Into<Box<OsStr>> for OsString`,
4730 `Into<Box<Path>> for PathBuf`,
4731 `Default for Box<str>`,
4732 `Default for Box<CStr>`,
4733 `Default for Box<OsStr>`,
4734 `From<&CStr> for Box<CStr>`,
4735 `From<&OsStr> for Box<OsStr>`,
4736 `From<&Path> for Box<Path>`
4737 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4738 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4739 * [Slightly optimize `slice::sort`][39538]
4740 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4741 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4742 `Box<str>` implements `From<&str>`][39438]
4743 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4744 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4745 * [`format!` estimates the needed capacity before writing a string][39356]
4746 * [Support unprivileged symlink creation in Windows][38921]
4747 * [`PathBuf` implements `Default`][38764]
4748 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4749 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4750 and poor hash functions.
4755 * [Add `cargo check --all`][cargo/3731]
4756 * [Add an option to ignore SSL revocation checking][cargo/3699]
4757 * [Add `cargo run --package`][cargo/3691]
4758 * [Add `required_features`][cargo/3667]
4759 * [Assume `build.rs` is a build script][cargo/3664]
4760 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4765 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4767 * [The "Unstable Book" documents nightly-only features][ubook]
4768 * [Improve the style of the sidebar in rustdoc output][40265]
4769 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4770 * [Fix MSP430 breakage due to `i128`][40257]
4771 * [Preliminary Solaris/SPARCv9 support][39903]
4772 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4773 run without installing the MSVC runtime.
4774 * [`rustdoc --test` includes file names in test names][39788]
4775 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4776 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4777 * [Initial support for `aarch64-unknown-freebsd`][39491]
4778 * [Initial support for `i686-unknown-netbsd`][39426]
4779 * [This release no longer includes the old makefile build system][39431]. Rust
4780 is built with a custom build system, written in Rust, and with Cargo.
4781 * [Add Debug implementations for libcollection structs][39002]
4782 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4783 * [`--test-threads=0` produces an error][38945]
4784 * [`rustup` installs documentation by default][40526]
4785 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4786 WinDbg and Visual Studio to improve the debugging experience.
4791 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4792 workaround, either use MSVC 2015 or run vcvars.bat.
4793 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4794 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4795 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4797 * [`format!` and `Display::to_string` panic if an underlying formatting
4798 implementation returns an error][40117]. Previously the error was silently
4799 ignored. It is incorrect for `write_fmt` to return an error when writing
4801 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4802 crates were marked stable and could be accessed from the stable toolchain.
4803 * [Rust git source no longer includes vendored crates][39728]. Those that need
4804 to build with vendored crates should build from release tarballs.
4805 * [Fix inert attributes from `proc_macro_derives`][39572]
4806 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4807 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4809 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4810 existing code generally ignores the type of dead-code unless a type-hint is
4811 provided; this can cause surprising inference interactions particularly around
4812 defaulting. The new code uniformly ignores the result type of dead-code.
4813 * [Tuple-struct constructors with private fields are no longer visible][38932]
4814 * [Lifetime parameters that do not appear in the arguments are now considered
4815 early-bound][38897], resolving a soundness bug (#[32330]). The
4816 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4818 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4819 * [Make transmuting from fn item types to pointer-sized types a hard
4822 [27787]: https://github.com/rust-lang/rust/issues/27787
4823 [32330]: https://github.com/rust-lang/rust/issues/32330
4824 [34198]: https://github.com/rust-lang/rust/pull/34198
4825 [38161]: https://github.com/rust-lang/rust/pull/38161
4826 [38368]: https://github.com/rust-lang/rust/pull/38368
4827 [38584]: https://github.com/rust-lang/rust/issues/38584
4828 [38661]: https://github.com/rust-lang/rust/pull/38661
4829 [38764]: https://github.com/rust-lang/rust/pull/38764
4830 [38864]: https://github.com/rust-lang/rust/issues/38864
4831 [38897]: https://github.com/rust-lang/rust/pull/38897
4832 [38921]: https://github.com/rust-lang/rust/pull/38921
4833 [38932]: https://github.com/rust-lang/rust/pull/38932
4834 [38945]: https://github.com/rust-lang/rust/pull/38945
4835 [38981]: https://github.com/rust-lang/rust/pull/38981
4836 [39002]: https://github.com/rust-lang/rust/pull/39002
4837 [39116]: https://github.com/rust-lang/rust/pull/39116
4838 [39193]: https://github.com/rust-lang/rust/pull/39193
4839 [39265]: https://github.com/rust-lang/rust/pull/39265
4840 [39356]: https://github.com/rust-lang/rust/pull/39356
4841 [39372]: https://github.com/rust-lang/rust/pull/39372
4842 [39426]: https://github.com/rust-lang/rust/pull/39426
4843 [39431]: https://github.com/rust-lang/rust/pull/39431
4844 [39438]: https://github.com/rust-lang/rust/pull/39438
4845 [39440]: https://github.com/rust-lang/rust/pull/39440
4846 [39485]: https://github.com/rust-lang/rust/pull/39485
4847 [39491]: https://github.com/rust-lang/rust/pull/39491
4848 [39518]: https://github.com/rust-lang/rust/pull/39518
4849 [39538]: https://github.com/rust-lang/rust/pull/39538
4850 [39572]: https://github.com/rust-lang/rust/pull/39572
4851 [39633]: https://github.com/rust-lang/rust/pull/39633
4852 [39642]: https://github.com/rust-lang/rust/pull/39642
4853 [39728]: https://github.com/rust-lang/rust/pull/39728
4854 [39761]: https://github.com/rust-lang/rust/pull/39761
4855 [39788]: https://github.com/rust-lang/rust/pull/39788
4856 [39793]: https://github.com/rust-lang/rust/pull/39793
4857 [39837]: https://github.com/rust-lang/rust/pull/39837
4858 [39843]: https://github.com/rust-lang/rust/pull/39843
4859 [39851]: https://github.com/rust-lang/rust/pull/39851
4860 [39903]: https://github.com/rust-lang/rust/pull/39903
4861 [39939]: https://github.com/rust-lang/rust/pull/39939
4862 [39953]: https://github.com/rust-lang/rust/pull/39953
4863 [39960]: https://github.com/rust-lang/rust/pull/39960
4864 [39990]: https://github.com/rust-lang/rust/pull/39990
4865 [39995]: https://github.com/rust-lang/rust/pull/39995
4866 [40008]: https://github.com/rust-lang/rust/pull/40008
4867 [40009]: https://github.com/rust-lang/rust/pull/40009
4868 [40027]: https://github.com/rust-lang/rust/pull/40027
4869 [40028]: https://github.com/rust-lang/rust/pull/40028
4870 [40037]: https://github.com/rust-lang/rust/pull/40037
4871 [40117]: https://github.com/rust-lang/rust/pull/40117
4872 [40166]: https://github.com/rust-lang/rust/pull/40166
4873 [40245]: https://github.com/rust-lang/rust/pull/40245
4874 [40257]: https://github.com/rust-lang/rust/pull/40257
4875 [40261]: https://github.com/rust-lang/rust/pull/40261
4876 [40265]: https://github.com/rust-lang/rust/pull/40265
4877 [40319]: https://github.com/rust-lang/rust/pull/40319
4878 [40336]: https://github.com/rust-lang/rust/pull/40336
4879 [40526]: https://github.com/rust-lang/rust/pull/40526
4880 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4881 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4882 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4883 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4884 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4885 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4886 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4887 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4888 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4889 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4890 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4891 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4892 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4893 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4894 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4895 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4896 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4897 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4898 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4899 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4900 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4901 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4902 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4903 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4904 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4905 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4906 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4907 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4908 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4909 [mdbook]: https://crates.io/crates/mdbook
4910 [ubook]: https://doc.rust-lang.org/unstable-book/
4913 Version 1.16.0 (2017-03-16)
4914 ===========================
4919 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4920 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4921 match patterns][38069]
4922 * [Clean up semantics of `self` in an import list][38313]
4923 * [`Self` may appear in `impl` headers][38920]
4924 * [`Self` may appear in struct expressions][39282]
4929 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4930 a `.rmeta` file containing only crate metadata][38571]. This can be
4931 used by tools like the Rust Language Service to perform
4932 metadata-only builds.
4933 * [Levenshtein based typo suggestions now work in most places, while
4934 previously they worked only for fields and sometimes for local
4935 variables][38927]. Together with the overhaul of "no
4936 resolution"/"unexpected resolution" errors (#[38154]) they result in
4937 large and systematic improvement in resolution diagnostics.
4938 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4940 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4941 * [`rustc` no longer attempts to provide "consider using an explicit
4942 lifetime" suggestions][37057]. They were inaccurate.
4947 * [`VecDeque::truncate`]
4948 * [`VecDeque::resize`]
4949 * [`String::insert_str`]
4950 * [`Duration::checked_add`]
4951 * [`Duration::checked_sub`]
4952 * [`Duration::checked_div`]
4953 * [`Duration::checked_mul`]
4956 * [`SocketAddr::is_ipv4`]
4957 * [`SocketAddr::is_ipv6`]
4958 * [`IpAddr::is_ipv4`]
4959 * [`IpAddr::is_ipv6`]
4961 * [`Vec::dedup_by_key`]
4962 * [`Result::unwrap_or_default`]
4963 * [`<*const T>::wrapping_offset`]
4964 * [`<*mut T>::wrapping_offset`]
4965 * `CommandExt::creation_flags`
4966 * [`File::set_permissions`]
4967 * [`String::split_off`]
4972 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4973 their argument by `Borrow` parameter][37761]
4974 * [All public types in std implement `Debug`][38006]
4975 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4976 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4977 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4979 * [std: Fix partial writes in `LineWriter`][38062]
4980 * [std: Clamp max read/write sizes on Unix][38062]
4981 * [Use more specific panic message for `&str` slicing errors][38066]
4982 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4983 functionality cannot be achieved in std currently.
4984 * [`writeln!`, like `println!`, now accepts a form with no string
4985 or formatting arguments, to just print a newline][38469]
4986 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4987 * [Reduce the size of static data in `std_unicode::tables`][38781]
4988 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4989 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4991 * [`Duration` implements `Sum`][38712]
4992 * [`String` implements `ToSocketAddrs`][39048]
4997 * [The `cargo check` command does a type check of a project without
4998 building it][cargo/3296]
4999 * [crates.io will display CI badges from Travis and AppVeyor, if
5000 specified in Cargo.toml][cargo/3546]
5001 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5002 * [Compilation profiles accept integer values for `debug`, in addition
5003 to `true` and `false`. These are passed to `rustc` as the value to
5004 `-C debuginfo`][cargo/3534]
5005 * [Implement `cargo --version --verbose`][cargo/3604]
5006 * [All builds now output 'dep-info' build dependencies compatible with
5007 make and ninja][cargo/3557]
5008 * [Build all workspace members with `build --all`][cargo/3511]
5009 * [Document all workspace members with `doc --all`][cargo/3515]
5010 * [Path deps outside workspace are not members][cargo/3443]
5015 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5016 the path to the Rust implementation][38589]
5017 * [The `armv7-linux-androideabi` target no longer enables NEON
5018 extensions, per Google's ABI guide][38413]
5019 * [The stock standard library can be compiled for Redox OS][38401]
5020 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5022 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5024 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5029 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5030 match patterns][38069]
5031 * In this release, references to uninhabited types can not be
5032 pattern-matched. This was accidentally allowed in 1.15.
5033 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5034 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5036 * [Clean up semantics of `self` in an import list][38313]
5037 * Reimplemented lifetime elision. This change was almost entirely compatible
5038 with existing code, but it did close a number of small bugs and loopholes,
5039 as well as being more accepting in some other [cases][41105].
5041 [37057]: https://github.com/rust-lang/rust/pull/37057
5042 [37761]: https://github.com/rust-lang/rust/pull/37761
5043 [38006]: https://github.com/rust-lang/rust/pull/38006
5044 [38051]: https://github.com/rust-lang/rust/pull/38051
5045 [38062]: https://github.com/rust-lang/rust/pull/38062
5046 [38062]: https://github.com/rust-lang/rust/pull/38622
5047 [38066]: https://github.com/rust-lang/rust/pull/38066
5048 [38069]: https://github.com/rust-lang/rust/pull/38069
5049 [38131]: https://github.com/rust-lang/rust/pull/38131
5050 [38154]: https://github.com/rust-lang/rust/pull/38154
5051 [38274]: https://github.com/rust-lang/rust/pull/38274
5052 [38304]: https://github.com/rust-lang/rust/pull/38304
5053 [38313]: https://github.com/rust-lang/rust/pull/38313
5054 [38314]: https://github.com/rust-lang/rust/pull/38314
5055 [38327]: https://github.com/rust-lang/rust/pull/38327
5056 [38401]: https://github.com/rust-lang/rust/pull/38401
5057 [38413]: https://github.com/rust-lang/rust/pull/38413
5058 [38469]: https://github.com/rust-lang/rust/pull/38469
5059 [38559]: https://github.com/rust-lang/rust/pull/38559
5060 [38571]: https://github.com/rust-lang/rust/pull/38571
5061 [38580]: https://github.com/rust-lang/rust/pull/38580
5062 [38589]: https://github.com/rust-lang/rust/pull/38589
5063 [38670]: https://github.com/rust-lang/rust/pull/38670
5064 [38712]: https://github.com/rust-lang/rust/pull/38712
5065 [38726]: https://github.com/rust-lang/rust/pull/38726
5066 [38781]: https://github.com/rust-lang/rust/pull/38781
5067 [38798]: https://github.com/rust-lang/rust/pull/38798
5068 [38909]: https://github.com/rust-lang/rust/pull/38909
5069 [38920]: https://github.com/rust-lang/rust/pull/38920
5070 [38927]: https://github.com/rust-lang/rust/pull/38927
5071 [39048]: https://github.com/rust-lang/rust/pull/39048
5072 [39282]: https://github.com/rust-lang/rust/pull/39282
5073 [39379]: https://github.com/rust-lang/rust/pull/39379
5074 [41105]: https://github.com/rust-lang/rust/issues/41105
5075 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5076 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5077 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5078 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5079 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5080 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5081 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5082 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5083 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5084 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5085 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5086 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5087 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5088 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5089 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5090 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5091 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5092 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5093 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5094 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5095 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5096 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5097 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5098 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5099 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5100 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5101 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5102 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5103 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5104 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5107 Version 1.15.1 (2017-02-09)
5108 ===========================
5110 * [Fix IntoIter::as_mut_slice's signature][39466]
5111 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5113 [39466]: https://github.com/rust-lang/rust/pull/39466
5114 [39523]: https://github.com/rust-lang/rust/pull/39523
5117 Version 1.15.0 (2017-02-02)
5118 ===========================
5123 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5124 stable. This allows popular code-generating crates like Serde and Diesel to
5125 work ergonomically. [RFC 1681].
5126 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5127 with curly braces][36868]. Part of [RFC 1506].
5128 * [A number of minor changes to name resolution have been activated][37127].
5129 They add up to more consistent semantics, allowing for future evolution of
5130 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5131 details of what is different. The breaking changes here have been transitioned
5132 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5133 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5135 * [`?Sized` can be used in `where` clauses][37791]
5136 * [There is now a limit on the size of monomorphized types and it can be
5137 modified with the `#![type_size_limit]` crate attribute, similarly to
5138 the `#![recursion_limit]` attribute][37789]
5143 * [On Windows, the compiler will apply dllimport attributes when linking to
5144 extern functions][37973]. Additional attributes and flags can control which
5145 library kind is linked and its name. [RFC 1717].
5146 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5147 * [The `--test` flag works with procedural macro crates][38107]
5148 * [Fix `extern "aapcs" fn` ABI][37814]
5149 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5150 * [The `format!` expander recognizes incorrect `printf` and shell-style
5151 formatting directives and suggests the correct format][37613].
5152 * [Only report one error for all unused imports in an import list][37456]
5154 Compiler Performance
5155 --------------------
5157 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5158 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5159 * [Don't clone in `UnificationTable::probe`][37848]
5160 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5161 * [Use small vectors in type walker][37760]
5162 * [Macro expansion performance was improved][37701]
5163 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5164 * [Replace FNV with a faster hash function][37229]
5169 * [`std::iter::Iterator::min_by`]
5170 * [`std::iter::Iterator::max_by`]
5171 * [`std::os::*::fs::FileExt`]
5172 * [`std::sync::atomic::Atomic*::get_mut`]
5173 * [`std::sync::atomic::Atomic*::into_inner`]
5174 * [`std::vec::IntoIter::as_slice`]
5175 * [`std::vec::IntoIter::as_mut_slice`]
5176 * [`std::sync::mpsc::Receiver::try_iter`]
5177 * [`std::os::unix::process::CommandExt::before_exec`]
5178 * [`std::rc::Rc::strong_count`]
5179 * [`std::rc::Rc::weak_count`]
5180 * [`std::sync::Arc::strong_count`]
5181 * [`std::sync::Arc::weak_count`]
5182 * [`std::char::encode_utf8`]
5183 * [`std::char::encode_utf16`]
5184 * [`std::cell::Ref::clone`]
5185 * [`std::io::Take::into_inner`]
5190 * [The standard sorting algorithm has been rewritten for dramatic performance
5191 improvements][38192]. It is a hybrid merge sort, drawing influences from
5192 Timsort. Previously it was a naive merge sort.
5193 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5194 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5196 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5197 and `char_indices().last()`][37882]
5198 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5199 * [Chinese characters display correctly in `fmt::Debug`][37855]
5200 * [Derive `Default` for `Duration`][37699]
5201 * [Support creation of anonymous pipes on WinXP/2k][37677]
5202 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5203 * [Don't pass overlapped handles to processes][38835]
5208 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5209 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5210 should instead check the variable at runtime with `std::env`. That the value
5211 was set at build time was a bug, and incorrect when cross-compiling. This
5212 change is known to cause breakage.
5213 * [Add `--all` flag to `cargo test`][cargo/3221]
5214 * [Compile statically against the MSVC CRT][cargo/3363]
5215 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5216 * [Link OpenSSL statically on OSX][cargo/3311]
5217 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5218 * [Test for bad path overrides with summaries][cargo/3336]
5219 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5220 * [Fix retrying crate downloads for network errors][cargo/3348]
5221 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5222 * [Emit more info on --message-format=json][cargo/3319]
5223 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5224 * [Don't ignore errors in workspace manifest][cargo/3409]
5225 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5230 * [Test runners (binaries built with `--test`) now support a `--list` argument
5231 that lists the tests it contains][38185]
5232 * [Test runners now support a `--exact` argument that makes the test filter
5233 match exactly, instead of matching only a substring of the test name][38181]
5234 * [rustdoc supports a `--playground-url` flag][37763]
5235 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5240 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5241 continue to be used in this release by passing `--disable-rustbuild` to the
5242 configure script, but they will be deleted soon. Note that the new build
5243 system uses a different on-disk layout that will likely affect any scripts
5245 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5247 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5248 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5254 * [A number of minor changes to name resolution have been activated][37127].
5255 They add up to more consistent semantics, allowing for future evolution of
5256 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5257 details of what is different. The breaking changes here have been transitioned
5258 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5259 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5260 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5261 should instead check the variable at runtime with `std::env`. That the value
5262 was set at build time was a bug, and incorrect when cross-compiling. This
5263 change is known to cause breakage.
5264 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5265 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5266 1.10 and is now an error by default. It will become a hard error in the near
5268 * [The semantics relating modules to file system directories are changing in
5269 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5270 lint, which is a warning in this release, and will become a hard error in the
5272 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5273 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5274 the underlying iterator][37834]
5276 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5277 [33685]: https://github.com/rust-lang/rust/issues/33685
5278 [36868]: https://github.com/rust-lang/rust/pull/36868
5279 [37127]: https://github.com/rust-lang/rust/pull/37127
5280 [37229]: https://github.com/rust-lang/rust/pull/37229
5281 [37456]: https://github.com/rust-lang/rust/pull/37456
5282 [37527]: https://github.com/rust-lang/rust/pull/37527
5283 [37602]: https://github.com/rust-lang/rust/pull/37602
5284 [37613]: https://github.com/rust-lang/rust/pull/37613
5285 [37615]: https://github.com/rust-lang/rust/pull/37615
5286 [37636]: https://github.com/rust-lang/rust/pull/37636
5287 [37627]: https://github.com/rust-lang/rust/pull/37627
5288 [37642]: https://github.com/rust-lang/rust/pull/37642
5289 [37677]: https://github.com/rust-lang/rust/pull/37677
5290 [37699]: https://github.com/rust-lang/rust/pull/37699
5291 [37701]: https://github.com/rust-lang/rust/pull/37701
5292 [37705]: https://github.com/rust-lang/rust/pull/37705
5293 [37749]: https://github.com/rust-lang/rust/pull/37749
5294 [37760]: https://github.com/rust-lang/rust/pull/37760
5295 [37763]: https://github.com/rust-lang/rust/pull/37763
5296 [37764]: https://github.com/rust-lang/rust/pull/37764
5297 [37789]: https://github.com/rust-lang/rust/pull/37789
5298 [37791]: https://github.com/rust-lang/rust/pull/37791
5299 [37814]: https://github.com/rust-lang/rust/pull/37814
5300 [37817]: https://github.com/rust-lang/rust/pull/37817
5301 [37834]: https://github.com/rust-lang/rust/pull/37834
5302 [37848]: https://github.com/rust-lang/rust/pull/37848
5303 [37855]: https://github.com/rust-lang/rust/pull/37855
5304 [37882]: https://github.com/rust-lang/rust/pull/37882
5305 [37888]: https://github.com/rust-lang/rust/pull/37888
5306 [37973]: https://github.com/rust-lang/rust/pull/37973
5307 [37979]: https://github.com/rust-lang/rust/pull/37979
5308 [38086]: https://github.com/rust-lang/rust/pull/38086
5309 [38107]: https://github.com/rust-lang/rust/pull/38107
5310 [38117]: https://github.com/rust-lang/rust/pull/38117
5311 [38134]: https://github.com/rust-lang/rust/pull/38134
5312 [38146]: https://github.com/rust-lang/rust/pull/38146
5313 [38181]: https://github.com/rust-lang/rust/pull/38181
5314 [38182]: https://github.com/rust-lang/rust/pull/38182
5315 [38185]: https://github.com/rust-lang/rust/pull/38185
5316 [38192]: https://github.com/rust-lang/rust/pull/38192
5317 [38279]: https://github.com/rust-lang/rust/pull/38279
5318 [38835]: https://github.com/rust-lang/rust/pull/38835
5319 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5320 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5321 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5322 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5323 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5324 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5325 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5326 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5327 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5328 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5329 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5330 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5331 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5332 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5333 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5334 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5335 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5336 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5337 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5338 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5339 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5340 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5341 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5342 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5343 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5344 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5345 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5346 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5347 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5348 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5349 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5350 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5351 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5352 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5353 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5354 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5355 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5356 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5359 Version 1.14.0 (2016-12-22)
5360 ===========================
5365 * [`..` matches multiple tuple fields in enum variants, structs
5366 and tuples][36843]. [RFC 1492].
5367 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5368 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5369 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5370 dereferencing][36822]
5375 * [Mark enums with non-zero discriminant as non-zero][37224]
5376 * [Lower-case `static mut` names are linted like other
5377 statics and consts][37162]
5378 * [Fix ICE on some macros in const integer positions
5379 (e.g. `[u8; m!()]`)][36819]
5380 * [Improve error message and snippet for "did you mean `x`"][36798]
5381 * [Add a panic-strategy field to the target specification][36794]
5382 * [Include LLVM version in `--version --verbose`][37200]
5384 Compile-time Optimizations
5385 --------------------------
5387 * [Improve macro expansion performance][37569]
5388 * [Shrink `Expr_::ExprInlineAsm`][37445]
5389 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5390 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5391 * [Avoid more allocations when compiling html5ever][37373]
5392 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5393 * [Avoid some allocations in the macro parser][37318]
5394 * [Use a faster deflate setting][37298]
5395 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5396 during interning of slices][37270]
5397 * [Optimize `write_metadata`][37267]
5398 * [Don't process obligation forest cycles when stalled][37231]
5399 * [Avoid many `CrateConfig` clones][37161]
5400 * [Optimize `Substs::super_fold_with`][37108]
5401 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5402 * [Speed up `plug_leaks`][36917]
5407 * [`println!()`, with no arguments, prints newline][36825].
5408 Previously, an empty string was required to achieve the same.
5409 * [`Wrapping` impls standard binary and unary operators, as well as
5410 the `Sum` and `Product` iterators][37356]
5411 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5413 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5414 `VecDeque` iterators][37315]
5415 * [Improve `SipHasher` performance on small values][37312]
5416 * [Add Iterator trait TrustedLen to enable better FromIterator /
5418 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5419 * [`ReadDir` implements `Debug`][37221]
5420 * [Implement `RefUnwindSafe` for atomic types][37178]
5421 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5422 * [Avoid allocations in `Decoder::read_str`][37064]
5423 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5424 * [Impl `Debug` for raw pointers to unsized data][36880]
5425 * [Don't reuse `HashMap` random seeds][37470]
5426 * [The internal memory layout of `HashMap` is more cache-friendly, for
5427 significant improvements in some operations][36692]
5428 * [`HashMap` uses less memory on 32-bit architectures][36595]
5429 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5434 * [Expose rustc cfg values to build scripts][cargo/3243]
5435 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5436 * [Fix passing --features when testing multiple packages][cargo/3280]
5437 * [Use a single profile set per workspace][cargo/3249]
5438 * [Load `replace` sections from lock files][cargo/3220]
5439 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5444 * [rustup is the recommended Rust installation method][1.14rustup]
5445 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5446 S390x. These are [tier 2] platforms and may have major defects. Follow the
5447 instructions on the website to install, or add the targets to an existing
5448 installation with `rustup target add`. The new target triples are:
5449 - `mips-unknown-linux-gnu`
5450 - `mipsel-unknown-linux-gnu`
5451 - `mips64-unknown-linux-gnuabi64`
5452 - `mips64el-unknown-linux-gnuabi64 `
5453 - `powerpc-unknown-linux-gnu`
5454 - `powerpc64-unknown-linux-gnu`
5455 - `powerpc64le-unknown-linux-gnu`
5456 - `s390x-unknown-linux-gnu `
5457 * This release includes target (std) builds for ARM Linux running MUSL
5458 libc. These are [tier 2] platforms and may have major defects. Add the
5459 following triples to an existing rustup installation with `rustup target add`:
5460 - `arm-unknown-linux-musleabi`
5461 - `arm-unknown-linux-musleabihf`
5462 - `armv7-unknown-linux-musleabihf`
5463 * This release includes [experimental support for WebAssembly][1.14wasm], via
5464 the `wasm32-unknown-emscripten` target. This target is known to have major
5465 defects. Please test, report, and fix.
5466 * rustup no longer installs documentation by default. Run `rustup
5467 component add rust-docs` to install.
5468 * [Fix line stepping in debugger][37310]
5469 * [Enable line number debuginfo in releases][37280]
5474 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5475 * [Add support for Fuchsia OS][37313]
5476 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5481 * [A number of forward-compatibility lints used by the compiler
5482 to gradually introduce language changes have been converted
5483 to deny by default][36894]:
5484 - ["use of inaccessible extern crate erroneously allowed"][36886]
5485 - ["type parameter default erroneously allowed in invalid location"][36887]
5486 - ["detects super or self keywords at the beginning of global path"][36888]
5487 - ["two overlapping inherent impls define an item with the same name
5488 were erroneously allowed"][36889]
5489 - ["floating-point constants cannot be used in patterns"][36890]
5490 - ["constants of struct or enum type can only be used in a pattern if
5491 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5492 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5493 * [Prohibit patterns in trait methods without bodies][37378]
5494 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5495 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5496 * [The `$crate` macro variable is accepted in fewer locations][37213]
5497 * [Impls specifying extra region requirements beyond the trait
5498 they implement are rejected][37167]
5499 * [Enums may not be unsized][37111]. Unsized enums are intended to
5500 work but never have. For now they are forbidden.
5501 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5503 [tier 2]: https://forge.rust-lang.org/platform-support.html
5504 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5505 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5506 [36430]: https://github.com/rust-lang/rust/pull/36430
5507 [36595]: https://github.com/rust-lang/rust/pull/36595
5508 [36595]: https://github.com/rust-lang/rust/pull/36595
5509 [36692]: https://github.com/rust-lang/rust/pull/36692
5510 [36767]: https://github.com/rust-lang/rust/pull/36767
5511 [36794]: https://github.com/rust-lang/rust/pull/36794
5512 [36798]: https://github.com/rust-lang/rust/pull/36798
5513 [36819]: https://github.com/rust-lang/rust/pull/36819
5514 [36822]: https://github.com/rust-lang/rust/pull/36822
5515 [36825]: https://github.com/rust-lang/rust/pull/36825
5516 [36843]: https://github.com/rust-lang/rust/pull/36843
5517 [36880]: https://github.com/rust-lang/rust/pull/36880
5518 [36886]: https://github.com/rust-lang/rust/issues/36886
5519 [36887]: https://github.com/rust-lang/rust/issues/36887
5520 [36888]: https://github.com/rust-lang/rust/issues/36888
5521 [36889]: https://github.com/rust-lang/rust/issues/36889
5522 [36890]: https://github.com/rust-lang/rust/issues/36890
5523 [36891]: https://github.com/rust-lang/rust/issues/36891
5524 [36892]: https://github.com/rust-lang/rust/issues/36892
5525 [36894]: https://github.com/rust-lang/rust/pull/36894
5526 [36917]: https://github.com/rust-lang/rust/pull/36917
5527 [36993]: https://github.com/rust-lang/rust/pull/36993
5528 [37037]: https://github.com/rust-lang/rust/pull/37037
5529 [37064]: https://github.com/rust-lang/rust/pull/37064
5530 [37094]: https://github.com/rust-lang/rust/pull/37094
5531 [37108]: https://github.com/rust-lang/rust/pull/37108
5532 [37111]: https://github.com/rust-lang/rust/pull/37111
5533 [37161]: https://github.com/rust-lang/rust/pull/37161
5534 [37162]: https://github.com/rust-lang/rust/pull/37162
5535 [37167]: https://github.com/rust-lang/rust/pull/37167
5536 [37178]: https://github.com/rust-lang/rust/pull/37178
5537 [37200]: https://github.com/rust-lang/rust/pull/37200
5538 [37213]: https://github.com/rust-lang/rust/pull/37213
5539 [37221]: https://github.com/rust-lang/rust/pull/37221
5540 [37224]: https://github.com/rust-lang/rust/pull/37224
5541 [37230]: https://github.com/rust-lang/rust/pull/37230
5542 [37231]: https://github.com/rust-lang/rust/pull/37231
5543 [37247]: https://github.com/rust-lang/rust/pull/37247
5544 [37267]: https://github.com/rust-lang/rust/pull/37267
5545 [37270]: https://github.com/rust-lang/rust/pull/37270
5546 [37273]: https://github.com/rust-lang/rust/pull/37273
5547 [37280]: https://github.com/rust-lang/rust/pull/37280
5548 [37298]: https://github.com/rust-lang/rust/pull/37298
5549 [37306]: https://github.com/rust-lang/rust/pull/37306
5550 [37310]: https://github.com/rust-lang/rust/pull/37310
5551 [37312]: https://github.com/rust-lang/rust/pull/37312
5552 [37313]: https://github.com/rust-lang/rust/pull/37313
5553 [37315]: https://github.com/rust-lang/rust/pull/37315
5554 [37318]: https://github.com/rust-lang/rust/pull/37318
5555 [37322]: https://github.com/rust-lang/rust/pull/37322
5556 [37326]: https://github.com/rust-lang/rust/pull/37326
5557 [37351]: https://github.com/rust-lang/rust/pull/37351
5558 [37356]: https://github.com/rust-lang/rust/pull/37356
5559 [37367]: https://github.com/rust-lang/rust/pull/37367
5560 [37373]: https://github.com/rust-lang/rust/pull/37373
5561 [37378]: https://github.com/rust-lang/rust/pull/37378
5562 [37389]: https://github.com/rust-lang/rust/pull/37389
5563 [37392]: https://github.com/rust-lang/rust/pull/37392
5564 [37427]: https://github.com/rust-lang/rust/pull/37427
5565 [37439]: https://github.com/rust-lang/rust/pull/37439
5566 [37445]: https://github.com/rust-lang/rust/pull/37445
5567 [37470]: https://github.com/rust-lang/rust/pull/37470
5568 [37569]: https://github.com/rust-lang/rust/pull/37569
5569 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5570 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5571 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5572 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5573 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5574 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5575 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5578 Version 1.13.0 (2016-11-10)
5579 ===========================
5584 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5585 errors, like the `try!` macro, described in [RFC 0243].
5586 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5587 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5588 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5589 * [Fix lifetime rules for 'if' conditions][36029]
5590 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5595 * [Add the `-C link-arg` argument][36574]
5596 * [Remove the old AST-based backend from rustc_trans][35764]
5597 * [Don't enable NEON by default on armv7 Linux][35814]
5598 * [Fix debug line number info for macro expansions][35238]
5599 * [Do not emit "class method" debuginfo for types that are not
5600 DICompositeType][36008]
5601 * [Warn about multiple conflicting #[repr] hints][34623]
5602 * [When sizing DST, don't double-count nested struct prefixes][36351]
5603 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5604 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5605 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5606 * [Expand macros without recursing to avoid stack overflows][36214]
5611 * [Replace macro backtraces with labeled local uses][35702]
5612 * [Improve error message for misplaced doc comments][33922]
5613 * [Buffer unix and lock windows to prevent message interleaving][35975]
5614 * [Update lifetime errors to specifically note temporaries][36171]
5615 * [Special case a few colors for Windows][36178]
5616 * [Suggest `use self` when such an import resolves][36289]
5617 * [Be more specific when type parameter shadows primitive type][36338]
5618 * Many minor improvements
5620 Compile-time Optimizations
5621 --------------------------
5623 * [Compute and cache HIR hashes at beginning][35854]
5624 * [Don't hash types in loan paths][36004]
5625 * [Cache projections in trans][35761]
5626 * [Optimize the parser's last token handling][36527]
5627 * [Only instantiate #[inline] functions in codegen units referencing
5628 them][36524]. This leads to big improvements in cases where crates export
5629 define many inline functions without using them directly.
5630 * [Lazily allocate TypedArena's first chunk][36592]
5631 * [Don't allocate during default HashSet creation][36734]
5638 * [`overflowing_abs`]
5639 * [`RefCell::try_borrow`]
5640 * [`RefCell::try_borrow_mut`]
5645 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5646 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5648 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5649 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5650 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5651 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5652 * [Use arc4rand on FreeBSD][35884]
5653 * [memrchr: Correct aligned offset computation][35969]
5654 * [Improve Demangling of Rust Symbols][36059]
5655 * [Use monotonic time in condition variables][35048]
5656 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5657 * [Implement conversion traits for `char`][35755]
5658 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5659 * [Zero first byte of CString on drop][36264]
5660 * [Inherit overflow checks for sum and product][36372]
5661 * [Add missing Eq implementations][36423]
5662 * [Implement `Debug` for `DirEntry`][36631]
5663 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5665 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5666 * [Implement more traits for `std::io::ErrorKind`][35911]
5667 * [Optimize BinaryHeap bounds checking][36072]
5668 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5669 `extend_with_element`][36355]
5670 * [Fix overflow checking in unsigned pow()][34942]
5675 * This release includes security fixes to both curl and OpenSSL.
5676 * [Fix transitive doctests when panic=abort][cargo/3021]
5677 * [Add --all-features flag to cargo][cargo/3038]
5678 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5679 * [Don't parse the home directory more than once][cargo/3078]
5680 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5681 * [Update OpenSSL to 1.0.2j][cargo/3121]
5682 * [Add license and license_file to cargo metadata output][cargo/3110]
5683 * [Make crates-io registry URL optional in config; ignore all changes to
5684 source.crates-io][cargo/3089]
5685 * [Don't download dependencies from other platforms][cargo/3123]
5686 * [Build transitive dev-dependencies when needed][cargo/3125]
5687 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5688 * [Avoid updating registry when adding existing deps][cargo/3144]
5689 * [Warn about path overrides that won't work][cargo/3136]
5690 * [Use workspaces during `cargo install`][cargo/3146]
5691 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5692 * [Add --message-format flag][cargo/3000]
5693 * [Pass target environment for rustdoc][cargo/3205]
5694 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5695 * [Update curl and curl-sys][cargo/3241]
5696 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5701 * [rustdoc: Add the `--sysroot` argument][36586]
5702 * [rustdoc: Fix a couple of issues with the search results][35655]
5703 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5704 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5705 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5710 * [Remove unmaintained style guide][35124]
5711 * [Add s390x support][36369]
5712 * [Initial work at Haiku OS support][36727]
5713 * [Add mips-uclibc targets][35734]
5714 * [Crate-ify compiler-rt into compiler-builtins][35021]
5715 * [Add rustc version info (git hash + date) to dist tarball][36213]
5716 * Many documentation improvements
5721 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5722 * [Deny (by default) transmuting from fn item types to pointer-sized
5723 types][34923]. Continuing the long transition to zero-sized fn items,
5725 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5727 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5728 * [Fix lifetime rules for 'if' conditions][36029].
5729 * [Inherit overflow checks for sum and product][36372].
5730 * [Forbid user-defined macros named "macro_rules"][36730].
5732 [33922]: https://github.com/rust-lang/rust/pull/33922
5733 [34623]: https://github.com/rust-lang/rust/pull/34623
5734 [34923]: https://github.com/rust-lang/rust/pull/34923
5735 [34942]: https://github.com/rust-lang/rust/pull/34942
5736 [34982]: https://github.com/rust-lang/rust/pull/34982
5737 [35021]: https://github.com/rust-lang/rust/pull/35021
5738 [35048]: https://github.com/rust-lang/rust/pull/35048
5739 [35074]: https://github.com/rust-lang/rust/pull/35074
5740 [35124]: https://github.com/rust-lang/rust/pull/35124
5741 [35234]: https://github.com/rust-lang/rust/pull/35234
5742 [35238]: https://github.com/rust-lang/rust/pull/35238
5743 [35354]: https://github.com/rust-lang/rust/pull/35354
5744 [35559]: https://github.com/rust-lang/rust/pull/35559
5745 [35585]: https://github.com/rust-lang/rust/pull/35585
5746 [35627]: https://github.com/rust-lang/rust/pull/35627
5747 [35655]: https://github.com/rust-lang/rust/pull/35655
5748 [35702]: https://github.com/rust-lang/rust/pull/35702
5749 [35707]: https://github.com/rust-lang/rust/pull/35707
5750 [35728]: https://github.com/rust-lang/rust/pull/35728
5751 [35734]: https://github.com/rust-lang/rust/pull/35734
5752 [35755]: https://github.com/rust-lang/rust/pull/35755
5753 [35761]: https://github.com/rust-lang/rust/pull/35761
5754 [35764]: https://github.com/rust-lang/rust/pull/35764
5755 [35814]: https://github.com/rust-lang/rust/pull/35814
5756 [35854]: https://github.com/rust-lang/rust/pull/35854
5757 [35871]: https://github.com/rust-lang/rust/pull/35871
5758 [35884]: https://github.com/rust-lang/rust/pull/35884
5759 [35911]: https://github.com/rust-lang/rust/pull/35911
5760 [35969]: https://github.com/rust-lang/rust/pull/35969
5761 [35975]: https://github.com/rust-lang/rust/pull/35975
5762 [36004]: https://github.com/rust-lang/rust/pull/36004
5763 [36008]: https://github.com/rust-lang/rust/pull/36008
5764 [36014]: https://github.com/rust-lang/rust/pull/36014
5765 [36029]: https://github.com/rust-lang/rust/pull/36029
5766 [36059]: https://github.com/rust-lang/rust/pull/36059
5767 [36072]: https://github.com/rust-lang/rust/pull/36072
5768 [36101]: https://github.com/rust-lang/rust/pull/36101
5769 [36104]: https://github.com/rust-lang/rust/pull/36104
5770 [36171]: https://github.com/rust-lang/rust/pull/36171
5771 [36173]: https://github.com/rust-lang/rust/pull/36173
5772 [36178]: https://github.com/rust-lang/rust/pull/36178
5773 [36213]: https://github.com/rust-lang/rust/pull/36213
5774 [36214]: https://github.com/rust-lang/rust/pull/36214
5775 [36264]: https://github.com/rust-lang/rust/pull/36264
5776 [36266]: https://github.com/rust-lang/rust/pull/36266
5777 [36289]: https://github.com/rust-lang/rust/pull/36289
5778 [36338]: https://github.com/rust-lang/rust/pull/36338
5779 [36351]: https://github.com/rust-lang/rust/pull/36351
5780 [36355]: https://github.com/rust-lang/rust/pull/36355
5781 [36369]: https://github.com/rust-lang/rust/pull/36369
5782 [36372]: https://github.com/rust-lang/rust/pull/36372
5783 [36423]: https://github.com/rust-lang/rust/pull/36423
5784 [36482]: https://github.com/rust-lang/rust/pull/36482
5785 [36505]: https://github.com/rust-lang/rust/pull/36505
5786 [36524]: https://github.com/rust-lang/rust/pull/36524
5787 [36527]: https://github.com/rust-lang/rust/pull/36527
5788 [36551]: https://github.com/rust-lang/rust/pull/36551
5789 [36574]: https://github.com/rust-lang/rust/pull/36574
5790 [36586]: https://github.com/rust-lang/rust/pull/36586
5791 [36592]: https://github.com/rust-lang/rust/pull/36592
5792 [36631]: https://github.com/rust-lang/rust/pull/36631
5793 [36639]: https://github.com/rust-lang/rust/pull/36639
5794 [36721]: https://github.com/rust-lang/rust/pull/36721
5795 [36727]: https://github.com/rust-lang/rust/pull/36727
5796 [36730]: https://github.com/rust-lang/rust/pull/36730
5797 [36734]: https://github.com/rust-lang/rust/pull/36734
5798 [36754]: https://github.com/rust-lang/rust/pull/36754
5799 [36995]: https://github.com/rust-lang/rust/pull/36995
5800 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5801 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5802 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5803 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5804 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5805 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5806 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5807 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5808 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5809 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5810 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5811 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5812 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5813 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5814 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5815 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5816 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5817 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5818 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5819 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5820 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5821 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5822 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5823 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5824 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5825 [rustup]: https://www.rustup.rs
5826 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5827 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5828 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5829 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5830 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5831 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5832 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5835 Version 1.12.1 (2016-10-20)
5836 ===========================
5841 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5842 * [Confusion with double negation and booleans][36856]
5843 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5844 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5845 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5846 * [Corrupted memory after updated to 1.12][36936]
5847 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5848 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5849 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5851 [36381]: https://github.com/rust-lang/rust/issues/36381
5852 [36856]: https://github.com/rust-lang/rust/issues/36856
5853 [36875]: https://github.com/rust-lang/rust/issues/36875
5854 [36924]: https://github.com/rust-lang/rust/issues/36924
5855 [36926]: https://github.com/rust-lang/rust/issues/36926
5856 [36936]: https://github.com/rust-lang/rust/issues/36936
5857 [37026]: https://github.com/rust-lang/rust/issues/37026
5858 [37112]: https://github.com/rust-lang/rust/issues/37112
5859 [37153]: https://github.com/rust-lang/rust/issues/37153
5862 Version 1.12.0 (2016-09-29)
5863 ===========================
5868 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5869 This translation pass is far simpler than the previous AST->LLVM pass, and
5870 creates opportunities to perform new optimizations directly on the MIR. It
5871 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5872 * [`rustc` presents a new, more readable error format, along with
5873 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5874 Most common editors supporting Rust have been updated to work with it. It was
5875 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5880 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5881 This translation pass is far simpler than the previous AST->LLVM pass, and
5882 creates opportunities to perform new optimizations directly on the MIR. It
5883 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5884 * [Print the Rust target name, not the LLVM target name, with
5885 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5886 * [The computation of `TypeId` is correct in some cases where it was previously
5887 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5888 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5889 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5890 `--print relocation-models`, and `--print code-models` print the available
5891 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5892 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5893 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5894 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5895 These targets produce statically-linked binaries. There are no binary release
5901 * [`rustc` presents a new, more readable error format, along with
5902 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5903 Most common editors supporting Rust have been updated to work with it. It was
5904 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5905 * [In error descriptions, references are now described in plain English,
5906 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5907 * [In error type descriptions, unknown numeric types are named `{integer}` or
5908 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5909 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5914 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5915 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5916 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5917 useful](https://github.com/rust-lang/rust/pull/34908)
5918 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5919 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5920 * [Semicolons are properly required as statement delimiters inside
5921 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5922 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5927 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5928 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5929 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5930 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5931 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5932 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5933 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5934 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5935 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5936 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5937 Both on Unix and Windows.
5938 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5939 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5940 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5941 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5942 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5943 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5944 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5945 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5950 * [The `format!` macro and friends now allow a single argument to be formatted
5951 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5952 * [The lifetime bounds on `[T]::binary_search_by` and
5953 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5954 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5955 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5956 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5957 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5958 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5959 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5960 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5961 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5962 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5963 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5964 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5965 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5966 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5967 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5968 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5969 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5970 * [`mpsc::sync_channel` `Receiver`s return any available message before
5971 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5972 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5973 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5978 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5979 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5980 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5981 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5982 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5983 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5984 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5985 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5986 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5987 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5988 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5989 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5990 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5991 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5992 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5993 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5998 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5999 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6004 * [Test binaries now support a `--test-threads` argument to specify the number
6005 of threads used to run tests, and which acts the same as the
6006 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6007 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6008 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6009 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6010 * [Rust releases now come with source packages that can be installed by rustup
6011 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6012 The resulting source code can be used by tools and IDES, located in the
6013 sysroot under `lib/rustlib/src`.
6018 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6019 * Many minor improvements to the documentation.
6020 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6025 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6026 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6027 * [When formatting strings, if "precision" is specified, the "fill",
6028 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6029 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6032 Version 1.11.0 (2016-08-18)
6033 ===========================
6038 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6039 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6040 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6041 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6046 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6047 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6048 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6049 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6050 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6051 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6052 (in libcore - previously stabilized in libstd)
6053 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6054 (in libcore - previously stabilized in libstd)
6055 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6056 (in libcore - previously stabilized in libstd)
6057 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6058 (in libcore - previously stabilized in libstd)
6059 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6060 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6061 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6062 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6067 * [The `thread_local!` macro supports multiple definitions in a single
6068 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6069 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6070 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6071 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6072 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6073 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6074 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6075 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6080 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6081 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6082 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6083 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6084 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6085 and `-vv` prints warnings for all crates.
6086 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6087 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6088 This provides room for expansion by arbitrary tools.
6089 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6090 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6091 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6092 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6093 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6094 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6095 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6100 * [Caching projections speeds up type check dramatically for some
6101 workloads](https://github.com/rust-lang/rust/pull/33816)
6102 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6103 This hasher is faster, but is believed to provide sufficient
6104 protection from collision attacks.
6105 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6110 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6111 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6112 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6113 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6114 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6119 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6120 * [When emitting debug info, rustc emits frame pointers for closures,
6121 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6122 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6123 * Many more errors have been given error codes and extended
6125 * API documentation continues to be improved, with many new examples
6130 * [rustc no longer hangs when dependencies recursively re-export
6131 submodules](https://github.com/rust-lang/rust/pull/34542)
6132 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6133 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6134 rewritten](https://github.com/rust-lang/rust/pull/33895)
6135 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6136 No targets use this yet, but it works toward AVR support.
6141 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6142 * [The new follow-set rules that place restrictions on `macro_rules!`
6143 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6144 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6145 and has been a warning since 1.10.
6146 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6147 This causes breakage in some corner cases.
6150 Version 1.10.0 (2016-07-07)
6151 ===========================
6156 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6157 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6158 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6159 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6160 * [`panic!` can be converted to a runtime abort with the
6161 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6162 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6163 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6164 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6165 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6166 Note that Cargo does not yet directly support cdylibs.
6171 * `os::windows::fs::OpenOptionsExt::access_mode`
6172 * `os::windows::fs::OpenOptionsExt::share_mode`
6173 * `os::windows::fs::OpenOptionsExt::custom_flags`
6174 * `os::windows::fs::OpenOptionsExt::attributes`
6175 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6176 * `os::unix::fs::OpenOptionsExt::custom_flags`
6177 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6178 * `Default for sync::Weak`
6179 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6180 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6181 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6182 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6183 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6184 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6185 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6186 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6187 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6188 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6189 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6190 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6191 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6192 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6193 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6194 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6195 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6196 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6197 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6198 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6199 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6200 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6201 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6202 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6203 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6204 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6205 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6206 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6207 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6208 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6209 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6210 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6211 * Read/Write/RawFd impls for `UnixStream`
6212 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6213 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6214 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6215 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6216 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6217 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6218 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6219 * RawFd impls for `UnixListener`
6220 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6221 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6222 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6223 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6224 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6225 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6226 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6227 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6228 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6229 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6230 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6231 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6232 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6233 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6234 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6235 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6236 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6237 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6238 * RawFd impls for `UnixDatagram`
6239 * `{BTree,Hash}Map::values_mut`
6240 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6245 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6246 The semantics of this minor method are subtle and probably not what
6248 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6249 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6250 will fall back to `/dev/urandom` temporarily to avoid blocking
6251 during early boot](https://github.com/rust-lang/rust/pull/33086).
6252 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6253 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6254 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6255 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6256 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6257 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6258 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6262 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6263 This controls the runtime behavior of the `panic!` macro
6264 and can be either "unwind" (the default), or "abort".
6265 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6266 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6267 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6268 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6269 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6270 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6271 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6272 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6273 By default they are retried twice, which can be customized with the
6274 `net.retry` value in `.cargo/config`.
6275 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6276 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6277 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6278 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6279 Makes it possible to install multiple crates in parallel.
6280 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6281 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6282 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6283 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6284 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6285 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6290 * [rustc memory usage was reduced by refactoring the context used for
6291 type checking](https://github.com/rust-lang/rust/pull/33425).
6292 * [Speed up creation of `HashMap`s by caching the random keys used
6293 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6294 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6295 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6296 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6297 10x faster than the previous lookup tables.
6298 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6303 * Many incremental improvements to documentation and rustdoc.
6304 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6305 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6306 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6307 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6308 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6309 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6310 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6315 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6316 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6317 * [`std` no longer prints backtraces on platforms where the running
6318 module must be loaded with `env::current_exe`, which can't be relied
6319 on](https://github.com/rust-lang/rust/pull/33554).
6320 * This release includes std binaries for the i586-unknown-linux-gnu,
6321 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6322 i586 target is for old x86 hardware without SSE2, and the armv7
6323 target is for Android running on modern ARM architectures.
6324 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6325 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6326 * [On Unix the runtime aborts by calling `libc::abort` instead of
6327 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6328 * [Rust is now bootstrapped from the previous release of Rust,
6329 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6334 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6335 * [`target_env` for Linux ARM targets is just `gnu`, not
6336 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6337 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6338 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6339 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6340 Affects how macros are parsed.
6341 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6342 * [Feature-gated attributes on macro-generated macro invocations are
6343 now rejected](https://github.com/rust-lang/rust/pull/32791).
6344 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6345 This caused some minor changes to type inference.
6348 Version 1.9.0 (2016-05-26)
6349 ==========================
6354 * The `#[deprecated]` attribute when applied to an API will generate
6355 warnings when used. The warnings may be suppressed with
6356 `#[allow(deprecated)]`. [RFC 1270].
6357 * [`fn` item types are zero sized, and each `fn` names a unique
6358 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6359 `transmute` on a `fn` type will generate a warning for a few cycles,
6360 then will be converted to an error.
6361 * [Field and method resolution understand visibility, so private
6362 fields and methods cannot prevent the proper use of public fields
6363 and methods][1.9fv].
6364 * [The parser considers unicode codepoints in the
6365 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6371 * [`std::panic::catch_unwind`] (renamed from `recover`)
6372 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6373 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6374 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6375 * [`str::is_char_boundary`]
6376 * [`<*const T>::as_ref`]
6377 * [`<*mut T>::as_ref`]
6378 * [`<*mut T>::as_mut`]
6379 * [`AsciiExt::make_ascii_uppercase`]
6380 * [`AsciiExt::make_ascii_lowercase`]
6381 * [`char::decode_utf16`]
6382 * [`char::DecodeUtf16`]
6383 * [`char::DecodeUtf16Error`]
6384 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6385 * [`BTreeSet::take`]
6386 * [`BTreeSet::replace`]
6389 * [`HashSet::replace`]
6391 * [`OsString::with_capacity`]
6392 * [`OsString::clear`]
6393 * [`OsString::capacity`]
6394 * [`OsString::reserve`]
6395 * [`OsString::reserve_exact`]
6396 * [`OsStr::is_empty`]
6398 * [`std::os::unix::thread`]
6401 * [`JoinHandleExt::as_pthread_t`]
6402 * [`JoinHandleExt::into_pthread_t`]
6403 * [`HashSet::hasher`]
6404 * [`HashMap::hasher`]
6405 * [`CommandExt::exec`]
6406 * [`File::try_clone`]
6407 * [`SocketAddr::set_ip`]
6408 * [`SocketAddr::set_port`]
6409 * [`SocketAddrV4::set_ip`]
6410 * [`SocketAddrV4::set_port`]
6411 * [`SocketAddrV6::set_ip`]
6412 * [`SocketAddrV6::set_port`]
6413 * [`SocketAddrV6::set_flowinfo`]
6414 * [`SocketAddrV6::set_scope_id`]
6415 * [`slice::copy_from_slice`]
6416 * [`ptr::read_volatile`]
6417 * [`ptr::write_volatile`]
6418 * [`OpenOptions::create_new`]
6419 * [`TcpStream::set_nodelay`]
6420 * [`TcpStream::nodelay`]
6421 * [`TcpStream::set_ttl`]
6422 * [`TcpStream::ttl`]
6423 * [`TcpStream::set_only_v6`]
6424 * [`TcpStream::only_v6`]
6425 * [`TcpStream::take_error`]
6426 * [`TcpStream::set_nonblocking`]
6427 * [`TcpListener::set_ttl`]
6428 * [`TcpListener::ttl`]
6429 * [`TcpListener::set_only_v6`]
6430 * [`TcpListener::only_v6`]
6431 * [`TcpListener::take_error`]
6432 * [`TcpListener::set_nonblocking`]
6433 * [`UdpSocket::set_broadcast`]
6434 * [`UdpSocket::broadcast`]
6435 * [`UdpSocket::set_multicast_loop_v4`]
6436 * [`UdpSocket::multicast_loop_v4`]
6437 * [`UdpSocket::set_multicast_ttl_v4`]
6438 * [`UdpSocket::multicast_ttl_v4`]
6439 * [`UdpSocket::set_multicast_loop_v6`]
6440 * [`UdpSocket::multicast_loop_v6`]
6441 * [`UdpSocket::set_multicast_ttl_v6`]
6442 * [`UdpSocket::multicast_ttl_v6`]
6443 * [`UdpSocket::set_ttl`]
6444 * [`UdpSocket::ttl`]
6445 * [`UdpSocket::set_only_v6`]
6446 * [`UdpSocket::only_v6`]
6447 * [`UdpSocket::join_multicast_v4`]
6448 * [`UdpSocket::join_multicast_v6`]
6449 * [`UdpSocket::leave_multicast_v4`]
6450 * [`UdpSocket::leave_multicast_v6`]
6451 * [`UdpSocket::take_error`]
6452 * [`UdpSocket::connect`]
6453 * [`UdpSocket::send`]
6454 * [`UdpSocket::recv`]
6455 * [`UdpSocket::set_nonblocking`]
6460 * [`std::sync::Once` is poisoned if its initialization function
6462 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6463 * [Most types implement `fmt::Debug`][1.9db].
6464 * [The default buffer size used by `BufReader` and `BufWriter` was
6465 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6466 used by other languages.
6467 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6468 `Duration` additionally implements `*=` and `/=`][1.9ta].
6469 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6470 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6471 * [`Chain` implements `BufRead`][1.9ch].
6472 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6477 * [Cargo can now run concurrently][1.9cc].
6478 * [Top-level overrides allow specific revisions of crates to be
6479 overridden through the entire crate graph][1.9ct]. This is intended
6480 to make upgrades easier for large projects, by allowing crates to be
6481 forked temporarily until they've been upgraded and republished.
6482 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6483 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6484 on the commandline][1.9cf]. `rustc` arguments can also be specified
6485 in the `build.rustflags` configuration key.
6490 * [The time complexity of comparing variables for equivalence during type
6491 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6492 to major compilation time improvement in some scenarios.
6493 * [`ToString` is specialized for `str`, giving it the same performance
6494 as `to_owned`][1.9ts].
6495 * [Spawning processes with `Command::output` no longer creates extra
6497 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6498 for C-like enums][1.9cl].
6503 * [Passing the `--quiet` flag to a test runner will produce
6504 much-abbreviated output][1.9q].
6505 * The Rust Project now publishes std binaries for the
6506 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6507 `i586-pc-windows-msvc` targets.
6512 * [`std::sync::Once` is poisoned if its initialization function
6514 * [It is illegal to define methods with the same name in overlapping
6515 inherent `impl` blocks][1.9sn].
6516 * [`fn` item types are zero sized, and each `fn` names a unique
6517 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6518 `transmute` on a `fn` type will generate a warning for a few cycles,
6519 then will be converted to an error.
6520 * [Improvements to const evaluation may trigger new errors when integer
6521 literals are out of range][1.9ce].
6524 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6525 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6526 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6527 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6528 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6529 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6530 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6531 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6532 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6533 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6534 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6535 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6536 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6537 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6538 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6539 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6540 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6541 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6542 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6543 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6544 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6545 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6546 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6547 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6548 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6549 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6550 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6551 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6552 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6553 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6554 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6555 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6556 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6557 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6558 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6559 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6560 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6561 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6562 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6563 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6564 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6565 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6566 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6567 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6568 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6569 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6570 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6571 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6572 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6573 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6574 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6575 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6576 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6577 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6578 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6579 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6580 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6581 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6582 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6583 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6584 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6585 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6586 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6587 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6588 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6589 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6590 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6591 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6592 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6593 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6594 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6595 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6596 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6597 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6598 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6599 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6600 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6601 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6602 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6603 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6604 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6605 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6606 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6607 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6608 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6609 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6610 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6611 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6612 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6613 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6614 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6615 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6616 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6617 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6618 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6619 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6620 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6621 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6622 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6623 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6624 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6625 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6626 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6627 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6628 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6629 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6630 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6631 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6632 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6633 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6636 Version 1.8.0 (2016-04-14)
6637 ==========================
6642 * Rust supports overloading of compound assignment statements like
6643 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6644 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6645 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6647 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6648 addition to the non-braced form, `struct Foo;`. [RFC 218].
6654 * [`str::encode_utf16`] (renamed from `utf16_units`)
6655 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6658 * [`ptr::drop_in_place`]
6660 * [`time::SystemTime`]
6662 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6663 * [`Instant::elapsed`]
6664 * [`SystemTime::now`]
6665 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6666 * [`SystemTime::elapsed`]
6667 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6668 * [`SystemTimeError`]
6669 * [`SystemTimeError::duration`]
6670 * Various impls for `SystemTimeError`
6672 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6673 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6674 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6675 * [The `write!` and `writeln!` macros correctly emit errors if any of
6676 their arguments can't be formatted][1.8w].
6677 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6678 * [The Unix-specific `raw` modules, which contain a number of
6679 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6680 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6681 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6682 across platforms was making it difficult to implement `std`
6683 correctly. Those that need these definitions should use the `libc`
6685 * The Unix-specific `MetadataExt` traits, including
6686 `os::unix::fs::MetadataExt`, which expose values such as inode
6687 numbers [no longer return platform-specific types][1.8r], but
6688 instead return widened integers. [RFC 1415].
6689 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6690 * [Atomic loads and stores are not volatile][1.8a].
6691 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6696 * [Inlining hash functions lead to a 3% compile-time improvement in
6697 some workloads][1.8h].
6698 * When using jemalloc, its symbols are [unprefixed so that it
6699 overrides the libc malloc implementation][1.8h]. This means that for
6700 rustc, LLVM is now using jemalloc, which results in a 6%
6701 compile-time improvement on a specific workload.
6702 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6707 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6708 i686-pc-windows-msvc is now considered a tier-1 platform.
6709 * [The `--print targets` flag prints a list of supported targets][1.8t].
6710 * [The `--print cfg` flag prints the `cfg`s defined for the current
6712 * [`rustc` can be built with an new Cargo-based build system, written
6713 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6714 build system. To enable it configure with `configure --rustbuild`.
6715 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6716 variants while also indicating the total number of missing variants
6717 if more than 3][1.8m].
6718 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6719 * The Rust Project now publishes binary releases of the standard
6720 library for a number of tier-2 targets:
6721 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6722 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6723 `x86_64-rumprun-netbsd`. These can be installed with
6724 tools such as [multirust][1.8mr].
6729 * [`cargo init` creates a new Cargo project in the current
6730 directory][1.8ci]. It is otherwise like `cargo new`.
6731 * [Cargo has configuration keys for `-v` and
6732 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6733 `[term]` section of `.cargo/config`.
6734 * [Configuration keys that evaluate to strings or integers can be set
6735 via environment variables][1.8ce]. For example the `build.jobs` key
6736 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6737 precedence over config files.
6738 * [Target-specific dependencies support Rust `cfg` syntax for
6739 describing targets][1.8cfg] so that dependencies for multiple
6740 targets can be specified together. [RFC 1361].
6741 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6742 `RUSTDOC` take precedence over the `build.target-dir`,
6743 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6744 * [The child process tree is killed on Windows when Cargo is
6746 * [The `build.target` configuration value sets the target platform,
6747 like `--target`][1.8ct].
6752 * [Unstable compiler flags have been further restricted][1.8u]. Since
6753 1.0 `-Z` flags have been considered unstable, and other flags that
6754 were considered unstable additionally required passing `-Z
6755 unstable-options` to access. Unlike unstable language and library
6756 features though, these options have been accessible on the stable
6757 release channel. Going forward, *new unstable flags will not be
6758 available on the stable release channel*, and old unstable flags
6759 will warn about their usage. In the future, all unstable flags will
6760 be unavailable on the stable release channel.
6761 * [It is no longer possible to `match` on empty enum variants using
6762 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6763 * The Unix-specific `MetadataExt` traits, including
6764 `os::unix::fs::MetadataExt`, which expose values such as inode
6765 numbers [no longer return platform-specific types][1.8r], but
6766 instead return widened integers. [RFC 1415].
6767 * [Modules sourced from the filesystem cannot appear within arbitrary
6768 blocks, but only within other modules][1.8mf].
6769 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6770 * On Unix, [stack overflow triggers a runtime abort instead of a
6772 * [`Command::spawn` and its equivalents return an error if any of
6773 its command-line arguments contain interior `NUL`s][1.8n].
6774 * [Tuple and unit enum variants from other crates are in the type
6776 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6777 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6778 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6779 instead of `foo.lib`.
6782 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6783 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6784 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6785 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6786 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6787 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6788 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6789 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6790 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6791 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6792 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6793 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6794 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6795 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6796 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6797 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6798 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6799 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6800 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6801 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6802 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6803 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6804 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6805 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6806 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6807 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6808 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6809 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6810 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6811 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6812 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6813 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6814 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6815 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6816 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6817 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6818 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6819 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6820 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6821 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6822 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6823 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6824 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6825 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6826 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6827 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6828 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6829 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6830 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6831 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6832 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6833 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6834 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6835 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6836 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6837 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6838 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6839 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6840 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6841 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6844 Version 1.7.0 (2016-03-03)
6845 ==========================
6852 * [`Path::strip_prefix`] (renamed from relative_from)
6853 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6855 * [`Ipv4Addr::is_loopback`]
6856 * [`Ipv4Addr::is_private`]
6857 * [`Ipv4Addr::is_link_local`]
6858 * [`Ipv4Addr::is_multicast`]
6859 * [`Ipv4Addr::is_broadcast`]
6860 * [`Ipv4Addr::is_documentation`]
6862 * [`Ipv6Addr::is_unspecified`]
6863 * [`Ipv6Addr::is_loopback`]
6864 * [`Ipv6Addr::is_multicast`]
6867 * [`Vec::as_mut_slice`]
6869 * [`String::as_str`]
6870 * [`String::as_mut_str`]
6872 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6874 * `<[T]>::`[`sort_by_key`]
6875 * checked, saturated, and overflowing operations
6876 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6877 * [`i32::saturating_mul`]
6878 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6879 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6880 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6881 * [`u32::saturating_mul`]
6882 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6883 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6884 * and checked, saturated, and overflowing operations for other primitive types
6886 * [`ffi::IntoStringError`]
6887 * [`CString::into_string`]
6888 * [`CString::into_bytes`]
6889 * [`CString::into_bytes_with_nul`]
6890 * `From<CString> for Vec<u8>`
6892 * [`IntoStringError::into_cstring`]
6893 * [`IntoStringError::utf8_error`]
6894 * `Error for IntoStringError`
6896 * [`std::hash::BuildHasher`]
6897 * [`BuildHasher::Hasher`]
6898 * [`BuildHasher::build_hasher`]
6899 * [`std::hash::BuildHasherDefault`]
6900 * [`HashMap::with_hasher`]
6901 * [`HashMap::with_capacity_and_hasher`]
6902 * [`HashSet::with_hasher`]
6903 * [`HashSet::with_capacity_and_hasher`]
6904 * [`std::collections::hash_map::RandomState`]
6905 * [`RandomState::new`]
6906 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6907 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6908 from bytes is faster.
6909 * [The performance of `LineWriter` (and thus `io::stdout`) was
6910 improved by using `memchr` to search for newlines][1.7m].
6911 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6912 `f64` variants were stabilized previously.
6913 * [`BTreeMap` was rewritten to use less memory and improve the performance
6914 of insertion and iteration, the latter by as much as 5x][1.7bm].
6915 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6916 covariant over their contained type][1.7bt].
6917 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6918 over their contained type][1.7ll].
6919 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6921 * [`Any` is implemented for unsized types][1.7a].
6922 * [`Hash` is implemented for `Duration`][1.7h].
6927 * [When running tests with `--test`, rustdoc will pass `--cfg`
6928 arguments to the compiler][1.7dt].
6929 * [The compiler is built with RPATH information by default][1.7rpa].
6930 This means that it will be possible to run `rustc` when installed in
6931 unusual configurations without configuring the dynamic linker search
6933 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6934 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6935 over `LD_LIBRARY_PATH`.
6940 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6941 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6942 * [The `rerun-if-changed` build script directive no longer causes the
6943 build script to incorrectly run twice in certain scenarios][1.7rr].
6948 * Soundness fixes to the interactions between associated types and
6949 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6950 code that violates the new rules. This is a significant change that
6951 is known to break existing code, so it has emitted warnings for the
6952 new error cases since 1.4 to give crate authors time to adapt. The
6953 details of what is changing are subtle; read the RFC for more.
6954 * [Several bugs in the compiler's visibility calculations were
6955 fixed][1.7v]. Since this was found to break significant amounts of
6956 code, the new errors will be emitted as warnings for several release
6957 cycles, under the `private_in_public` lint.
6958 * Defaulted type parameters were accidentally accepted in positions
6959 that were not intended. In this release, [defaulted type parameters
6960 appearing outside of type definitions will generate a
6961 warning][1.7d], which will become an error in future releases.
6962 * [Parsing "." as a float results in an error instead of 0][1.7p].
6963 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6964 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6966 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6967 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6968 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6969 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6970 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6971 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6972 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6973 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6974 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6975 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6976 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6977 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6978 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6979 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6980 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6981 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6982 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6983 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6984 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6985 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6986 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6987 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6988 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6989 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6990 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6991 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6992 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6993 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6994 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6995 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6996 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6997 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6998 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6999 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7000 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7001 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7002 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7003 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7004 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7005 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7006 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7007 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7008 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7009 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7010 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7011 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7012 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7013 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7014 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7015 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7016 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7017 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7018 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7019 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7020 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7021 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7022 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7023 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7024 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7025 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7026 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7027 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7028 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7029 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7030 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7031 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7032 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7033 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7034 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7035 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7036 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7037 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7038 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7039 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7040 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7041 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7042 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7043 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7044 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7047 Version 1.6.0 (2016-01-21)
7048 ==========================
7053 * The `#![no_std]` attribute causes a crate to not be linked to the
7054 standard library, but only the [core library][1.6co], as described
7055 in [RFC 1184]. The core library defines common types and traits but
7056 has no platform dependencies whatsoever, and is the basis for Rust
7057 software in environments that cannot support a full port of the
7058 standard library, such as operating systems. Most of the core
7059 library is now stable.
7065 [`Read::read_exact`],
7066 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7067 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7068 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7069 [`os::unix::fs::DirBuilderExt`],
7070 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7071 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7072 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7073 [`collections::hash_map::Drain`],
7074 [`collections::hash_map::HashMap::drain`],
7075 [`collections::hash_set::Drain`],
7076 [`collections::hash_set::HashSet::drain`],
7077 [`collections::binary_heap::Drain`],
7078 [`collections::binary_heap::BinaryHeap::drain`],
7079 [`Vec::extend_from_slice`] (renamed from `push_all`),
7080 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7081 [`RwLock::into_inner`],
7082 [`Iterator::min_by_key`] (renamed from `min_by`),
7083 [`Iterator::max_by_key`] (renamed from `max_by`).
7084 * The [core library][1.6co] is stable, as are most of its APIs.
7085 * [The `assert_eq!` macro supports arguments that don't implement
7086 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7088 * Several timer functions that take duration in milliseconds [are
7089 deprecated in favor of those that take `Duration`][1.6ms]. These
7090 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7091 `thread::park_timeout_ms`.
7092 * The algorithm by which `Vec` reserves additional elements was
7093 [tweaked to not allocate excessive space][1.6a] while still growing
7095 * `From` conversions are [implemented from integers to floats][1.6f]
7096 in cases where the conversion is lossless. Thus they are not
7097 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7098 or `f64`. They are also not implemented for `isize` and `usize`
7099 because the implementations would be platform-specific. `From` is
7100 also implemented from `f32` to `f64`.
7101 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7102 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7103 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7104 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7106 * Sorting slices that are already sorted [is 50% faster in some
7112 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7113 * Cargo build scripts can specify their dependencies by emitting the
7114 [`rerun-if-changed`][1.6rr] key.
7115 * crates.io will reject publication of crates with dependencies that
7116 have a wildcard version constraint. Crates with wildcard
7117 dependencies were seen to cause a variety of problems, as described
7118 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7120 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7121 release folder. A variety of artifacts that Cargo failed to clean
7122 are now correctly deleted.
7127 * The `unreachable_code` lint [warns when a function call's argument
7129 * The parser indicates [failures that may be caused by
7130 confusingly-similar Unicode characters][1.6uc]
7131 * Certain macro errors [are reported at definition time][1.6m], not
7137 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7138 environment variable when locating crates. This was a pre-cargo
7139 feature for integrating with the package manager that was
7140 accidentally never removed.
7141 * [A number of bugs were fixed in the privacy checker][1.6p] that
7142 could cause previously-accepted code to break.
7143 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7144 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7145 struct pattern syntax (`Foo(..)`) can no longer be used to match
7146 unit structs. This is a warning now, but will become an error in
7147 future releases. Patterns that share the same name as a const are
7149 * A bug was fixed that causes [rustc not to apply default type
7150 parameters][1.6xc] when resolving certain method implementations of
7151 traits defined in other crates.
7153 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7154 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7155 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7156 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7157 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7158 [1.6co]: http://doc.rust-lang.org/core/index.html
7159 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7160 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7161 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7162 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7163 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7164 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7165 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7166 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7167 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7168 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7169 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7170 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7171 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7172 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7173 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7174 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7175 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7176 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7177 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7178 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7179 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7180 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7181 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7182 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7183 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7184 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7185 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7186 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7187 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7188 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7189 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7190 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7191 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7192 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7193 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7194 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7195 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7196 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7197 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7198 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7199 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7202 Version 1.5.0 (2015-12-10)
7203 ==========================
7205 * ~700 changes, numerous bugfixes
7211 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7212 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7213 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7214 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7215 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7216 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7217 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7218 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7219 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7220 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7221 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7222 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7223 [`Path::read_link`], [`Path::symlink_metadata`],
7224 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7225 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7226 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7227 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7228 [`slice::split_first_mut`], [`slice::split_first`],
7229 [`slice::split_last_mut`], [`slice::split_last`],
7230 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7231 [`str::MatchIndices`], [`str::RMatchIndices`],
7232 [`str::match_indices`], [`str::rmatch_indices`],
7233 [`str::slice_mut_unchecked`], [`string::ParseError`].
7234 * Rust applications hosted on crates.io can be installed locally to
7235 `~/.cargo/bin` with the [`cargo install`] command. Among other
7236 things this makes it easier to augment Cargo with new subcommands:
7237 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7238 invoked as `cargo foo`.
7239 * Crates with wildcard (`*`) dependencies will [emit warnings when
7240 published][1.5w]. In 1.6 it will no longer be possible to publish
7241 crates with wildcard dependencies.
7246 * The rules determining when a particular lifetime must outlive
7247 a particular value (known as '[dropck]') have been [modified
7248 to not rely on parametricity][1.5p].
7249 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7250 and `Arc`][1.5a]. Because these smart pointer types implement
7251 `Deref`, this causes breakage in cases where the interior type
7252 contains methods of the same name.
7253 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7254 that they could drop their content. Soundness fix.
7255 * All method invocations are [properly checked][1.5wf1] for
7256 [well-formedness][1.5wf2]. Soundness fix.
7257 * Traits whose supertraits contain `Self` are [not object
7258 safe][1.5o]. Soundness fix.
7259 * Target specifications support a [`no_default_libraries`][1.5nd]
7260 setting that controls whether `-nodefaultlibs` is passed to the
7261 linker, and in turn the `is_like_windows` setting no longer affects
7262 the `-nodefaultlibs` flag.
7263 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7264 * The `#[inline]` and `#[repr]` attributes [can only appear
7265 in valid locations][1.5at].
7266 * Native libraries linked from the local crate are [passed to
7267 the linker before native libraries from upstream crates][1.5nl].
7268 * Two rarely-used attributes, `#[no_debug]` and
7269 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7270 * Negation of unsigned integers, which has been a warning for
7271 several releases, [is now behind a feature gate and will
7272 generate errors][1.5nu].
7273 * The parser accidentally accepted visibility modifiers on
7274 enum variants, a bug [which has been fixed][1.5ev].
7275 * [A bug was fixed that allowed `use` statements to import unstable
7281 * When evaluating expressions at compile-time that are not
7282 compile-time constants (const-evaluating expressions in non-const
7283 contexts), incorrect code such as overlong bitshifts and arithmetic
7284 overflow will [generate a warning instead of an error][1.5ce],
7285 delaying the error until runtime. This will allow the
7286 const-evaluator to be expanded in the future backwards-compatibly.
7287 * The `improper_ctypes` lint [no longer warns about using `isize` and
7288 `usize` in FFI][1.5ict].
7293 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7295 * `Default` is [implemented for mutable slices][1.5d].
7296 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7297 * There are now `From` conversions [between floating point
7298 types][1.5f] where the conversions are lossless.
7299 * There are now `From` conversions [between integer types][1.5i] where
7300 the conversions are lossless.
7301 * [`fs::Metadata` implements `Clone`][1.5fs].
7302 * The `parse` method [accepts a leading "+" when parsing
7304 * [`AsMut` is implemented for `Vec`][1.5am].
7305 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7306 been optimized][1.5cf] and no longer rely on the default impl.
7307 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7308 `unsafe extern "C"` function types now [implement `Clone`,
7309 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7310 `fmt::Debug` for up to 12 arguments][1.5fp].
7311 * [Dropping `Vec`s is much faster in unoptimized builds when the
7312 element types don't implement `Drop`][1.5dv].
7313 * A bug that caused in incorrect behavior when [combining `VecDeque`
7314 with zero-sized types][1.5vdz] was resolved.
7315 * [`PartialOrd` for slices is faster][1.5po].
7320 * [Crate metadata size was reduced by 20%][1.5md].
7321 * [Improvements to code generation reduced the size of libcore by 3.3
7322 MB and rustc's memory usage by 18MB][1.5m].
7323 * [Improvements to deref translation increased performance in
7324 unoptimized builds][1.5dr].
7325 * Various errors in trait resolution [are deduplicated to only be
7326 reported once][1.5te].
7327 * Rust has preliminary [support for rumprun kernels][1.5rr].
7328 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7330 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7331 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7332 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7333 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7334 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7335 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7336 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7337 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7338 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7339 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7340 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7341 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7342 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7343 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7344 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7345 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7346 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7347 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7348 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7349 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7350 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7351 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7352 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7353 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7354 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7355 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7356 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7357 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7358 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7359 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7360 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7361 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7362 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7363 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7364 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7365 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7366 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7367 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7368 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7369 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7370 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7371 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7372 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7373 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7374 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7375 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7376 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7377 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7378 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7379 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7380 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7381 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7382 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7383 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7384 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7385 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7386 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7387 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7388 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7389 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7390 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7391 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7392 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7393 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7394 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7395 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7396 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7397 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7398 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7399 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7400 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7401 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7402 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7403 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7404 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7405 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7406 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7407 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7408 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7409 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7410 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7411 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7412 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7413 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7414 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7415 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7416 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7417 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7418 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7420 Version 1.4.0 (2015-10-29)
7421 ==========================
7423 * ~1200 changes, numerous bugfixes
7428 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7429 GNU) are now supported and recommended for use.
7434 * [Several changes have been made to fix type soundness and improve
7435 the behavior of associated types][sound]. See [RFC 1214]. Although
7436 we have mostly introduced these changes as warnings this release, to
7437 become errors next release, there are still some scenarios that will
7438 see immediate breakage.
7439 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7440 line breaks in addition to `\n`][crlf].
7441 * [Loans of `'static` lifetime extend to the end of a function][stat].
7442 * [`str::parse` no longer introduces avoidable rounding error when
7443 parsing floating point numbers. Together with earlier changes to
7444 float formatting/output, "round trips" like f.to_string().parse()
7445 now preserve the value of f exactly. Additionally, leading plus
7446 signs are now accepted][fp3].
7452 * `use` statements that import multiple items [can now rename
7453 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7454 * [Binops work correctly on fat pointers][binfat].
7455 * `pub extern crate`, which does not behave as expected, [issues a
7456 warning][pec] until a better solution is found.
7461 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7462 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7463 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7464 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7465 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7466 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7467 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7468 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7469 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7470 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7471 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7472 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7473 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7474 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7475 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7476 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7477 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7478 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7480 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7481 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7482 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7483 `f64::from_str_radix`.
7484 * [Reverse-searching strings is faster with the 'two-way'
7486 * [`std::io::copy` allows `?Sized` arguments][cc].
7487 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7488 [override `count`, `nth` and `last` with an O(1)
7489 implementation][it].
7490 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7491 * [`IntoRawFd` has been added to the Unix-specific prelude,
7492 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7494 * [`Extend<String>` and `FromIterator<String` are both implemented for
7496 * [`IntoIterator` is implemented for references to `Option` and
7498 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7499 Copy`][ext] as part of [RFC 839]. This will cause type inference
7500 breakage in rare situations.
7501 * [`BinaryHeap` implements `Debug`][bh2].
7502 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7504 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7505 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7506 * [String comparison is faster][faststr].
7507 * `&mut T` where `T: std::fmt::Write` [also implements
7508 `std::fmt::Write`][mutw].
7509 * [A stable regression in `VecDeque::push_back` and other
7510 capacity-altering methods that caused panics for zero-sized types
7512 * [Function pointers implement traits for up to 12 parameters][fp2].
7517 * The compiler [no longer uses the 'morestack' feature to prevent
7518 stack overflow][mm]. Instead it uses guard pages and stack
7519 probes (though stack probes are not yet implemented on any platform
7521 * [The compiler matches traits faster when projections are involved][p].
7522 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7524 * [Cargo now displays useful information about what its doing during
7525 `cargo update`][cu].
7527 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7528 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7529 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7530 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7531 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7532 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7533 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7534 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7535 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7536 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7537 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7538 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7539 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7540 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7541 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7542 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7543 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7544 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7545 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7546 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7547 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7548 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7549 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7550 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7551 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7552 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7553 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7554 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7555 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7556 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7557 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7558 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7559 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7560 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7561 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7562 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7563 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7564 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7565 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7566 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7567 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7568 [bh2]: https://github.com/rust-lang/rust/pull/28156
7569 [binfat]: https://github.com/rust-lang/rust/pull/28270
7570 [bm]: https://github.com/rust-lang/rust/pull/28197
7571 [cc]: https://github.com/rust-lang/rust/pull/27531
7572 [crlf]: https://github.com/rust-lang/rust/pull/28034
7573 [cu]: https://github.com/rust-lang/cargo/pull/1931
7574 [d]: https://github.com/rust-lang/rust/pull/27825
7575 [dep]: https://github.com/rust-lang/rust/pull/28339
7576 [es]: https://github.com/rust-lang/rust/pull/27956
7577 [ext]: https://github.com/rust-lang/rust/pull/28094
7578 [faststr]: https://github.com/rust-lang/rust/pull/28338
7579 [ffi]: https://github.com/rust-lang/rust/pull/28779
7580 [fp]: https://github.com/rust-lang/rust/pull/28268
7581 [fp2]: https://github.com/rust-lang/rust/pull/28560
7582 [fp3]: https://github.com/rust-lang/rust/pull/27307
7583 [i]: https://github.com/rust-lang/rust/pull/27451
7584 [into2]: https://github.com/rust-lang/rust/pull/28039
7585 [it]: https://github.com/rust-lang/rust/pull/27652
7586 [mm]: https://github.com/rust-lang/rust/pull/27338
7587 [mutw]: https://github.com/rust-lang/rust/pull/28368
7588 [sound]: https://github.com/rust-lang/rust/pull/27641
7589 [p]: https://github.com/rust-lang/rust/pull/27866
7590 [pec]: https://github.com/rust-lang/rust/pull/28486
7591 [pr]: https://github.com/rust-lang/rust/pull/27896
7592 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7593 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7594 [s]: https://github.com/rust-lang/rust/pull/27474
7595 [stab]: https://github.com/rust-lang/rust/pull/28339
7596 [stat]: https://github.com/rust-lang/rust/pull/28321
7597 [vd]: https://github.com/rust-lang/rust/pull/28494
7599 Version 1.3.0 (2015-09-17)
7600 ==============================
7602 * ~900 changes, numerous bugfixes
7607 * The [new object lifetime defaults][nold] have been [turned
7608 on][nold2] after a cycle of warnings about the change. Now types
7609 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7610 being interpreted as `&'a Box<Trait+'a>` to `&'a
7611 Box<Trait+'static>`.
7612 * [The Rustonomicon][nom] is a new book in the official documentation
7613 that dives into writing unsafe Rust.
7614 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7615 timekeeping is employed by other std APIs, as well as out-of-tree
7621 * The [new object lifetime defaults][nold] have been [turned
7622 on][nold2] after a cycle of warnings about the change.
7623 * There is a known [regression][lr] in how object lifetime elision is
7624 interpreted, the proper solution for which is undetermined.
7625 * The `#[prelude_import]` attribute, an internal implementation
7626 detail, was accidentally stabilized previously. [It has been put
7627 behind the `prelude_import` feature gate][pi]. This change is
7628 believed to break no existing code.
7629 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7630 [more sane for dynamically sized types][dst3]. Code that relied on
7631 the previous behavior is thought to be broken.
7632 * The `dropck` rules, which checks that destructors can't access
7633 destroyed values, [have been updated][dropck] to match the
7634 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7635 cause some previously-compiling code to no longer build.
7640 * The [new object lifetime defaults][nold] have been [turned
7641 on][nold2] after a cycle of warnings about the change.
7642 * Semicolons may [now follow types and paths in
7643 macros](https://github.com/rust-lang/rust/pull/27000).
7644 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7645 [more sane for dynamically sized types][dst3]. Code that relied on
7646 the previous behavior is not known to exist, and suspected to be
7648 * `'static` variables [may now be recursive][st].
7649 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7650 implementations correctly.
7651 * The `dropck` rules, which checks that destructors can't access
7652 destroyed values, [have been updated][dropck] to match the
7658 * The [`Duration`] API, [has been stabilized][ds], as well as the
7659 `std::time` module, which presently contains only `Duration`.
7660 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7661 * The owned C string, [`CString`], implements [`Borrow`] and the
7662 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7663 these allow C strings to be borrowed and cloned in generic code.
7664 * [`CStr`] implements [`Debug`].
7665 * [`AtomicPtr`] implements [`Debug`].
7666 * [`Error`] trait objects [can be downcast to their concrete types][e]
7667 in many common configurations, using the [`is`], [`downcast`],
7668 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7670 * Searching for substrings now [employs the two-way algorithm][search]
7671 instead of doing a naive search. This gives major speedups to a
7672 number of methods, including [`contains`][sc], [`find`][sf],
7673 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7674 [`ends_with`][sew] are also faster.
7675 * The performance of `PartialEq` for slices is [much faster][ps].
7676 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7677 is overridden and optimized by the implementations for scalars.
7678 * The [`Hasher`] trait now has a number of specialized `write_*`
7679 methods for primitive types, for efficiency.
7680 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7681 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7682 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7683 of [`std::error::Error::cause`][iec] also delegates to the inner
7685 * [`process::Child`][pc] gained the [`id`] method, which returns a
7686 `u32` representing the platform-specific process identifier.
7687 * The [`connect`] method on slices is deprecated, replaced by the new
7688 [`join`] method (note that both of these are on the *unstable*
7689 [`SliceConcatExt`] trait, but through the magic of the prelude are
7690 available to stable code anyway).
7691 * The [`Div`] operator is implemented for [`Wrapping`] types.
7692 * [`DerefMut` is implemented for `String`][dms].
7693 * Performance of SipHash (the default hasher for `HashMap`) is
7694 [better for long data][sh].
7695 * [`AtomicPtr`] implements [`Send`].
7696 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7697 are now [specialized to use uninitialized buffers for increased
7699 * Lifetime parameters of foreign functions [are now resolved
7705 * Rust can now, with some coercion, [produce programs that run on
7706 Windows XP][xp], though XP is not considered a supported platform.
7707 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7708 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7709 recommended for use in 1.3, though should be fully-functional
7710 in the [64-bit 1.4 beta][b14].
7711 * On Fedora-based systems installation will [properly configure the
7712 dynamic linker][fl].
7713 * The compiler gained many new extended error descriptions, which can
7714 be accessed with the `--explain` flag.
7715 * The `dropck` pass, which checks that destructors can't access
7716 destroyed values, [has been rewritten][dropck]. This fixes some
7717 soundness holes, and as such will cause some previously-compiling
7718 code to no longer build.
7719 * `rustc` now uses [LLVM to write archive files where possible][ar].
7720 Eventually this will eliminate the compiler's dependency on the ar
7722 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7723 supported FreeBSD on x86_64).
7724 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7725 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7727 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7728 will kill the process instead of leaking][nlp].
7730 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7731 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7732 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7733 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7734 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7735 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7736 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7737 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7738 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7739 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7740 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7741 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7742 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7743 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7744 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7745 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7746 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7747 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7748 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7749 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7750 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7751 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7752 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7753 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7754 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7755 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7756 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7757 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7758 [ar]: https://github.com/rust-lang/rust/pull/26926
7759 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7760 [dms]: https://github.com/rust-lang/rust/pull/26241
7761 [dropck]: https://github.com/rust-lang/rust/pull/27261
7762 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7763 [ds]: https://github.com/rust-lang/rust/pull/26818
7764 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7765 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7766 [dst3]: https://github.com/rust-lang/rust/pull/27351
7767 [e]: https://github.com/rust-lang/rust/pull/24793
7768 [f]: https://github.com/rust-lang/rust/pull/26588
7769 [fb]: https://github.com/rust-lang/rust/pull/26959
7770 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7771 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7772 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7773 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7774 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7775 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7776 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7777 [lic]: https://github.com/rust-lang/rust/pull/26583
7778 [lnu]: https://github.com/rust-lang/rust/pull/27026
7779 [lr]: https://github.com/rust-lang/rust/issues/27248
7780 [lum]: https://github.com/rust-lang/rust/pull/26378
7781 [lur]: https://github.com/rust-lang/rust/pull/26783
7782 [nlp]: https://github.com/rust-lang/rust/pull/27176
7783 [nold2]: https://github.com/rust-lang/rust/pull/27045
7784 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7785 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7786 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7787 [pi]: https://github.com/rust-lang/rust/pull/26699
7788 [ps]: https://github.com/rust-lang/rust/pull/26884
7789 [rte]: https://github.com/rust-lang/rust/pull/26950
7790 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7791 [search]: https://github.com/rust-lang/rust/pull/26327
7792 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7793 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7794 [sh]: https://github.com/rust-lang/rust/pull/27280
7795 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7796 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7797 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7798 [st]: https://github.com/rust-lang/rust/pull/26630
7799 [win1]: https://github.com/rust-lang/rust/pull/26569
7800 [win2]: https://github.com/rust-lang/rust/pull/26741
7801 [win3]: https://github.com/rust-lang/rust/pull/26741
7802 [win4]: https://github.com/rust-lang/rust/pull/27210
7803 [xp]: https://github.com/rust-lang/rust/pull/26569
7805 Version 1.2.0 (2015-08-07)
7806 ==========================
7808 * ~1200 changes, numerous bugfixes
7813 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7814 like `Rc` to contain types without a fixed size, arrays and trait
7815 objects, finally enabling use of `Rc<[T]>` and completing the
7816 implementation of DST.
7817 * [Parallel codegen][parcodegen] is now working again, which can
7818 substantially speed up large builds in debug mode; It also gets
7819 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7820 jobs). It's not enabled by default, but will be "in the near
7821 future". It can be activated with the `-C codegen-units=N` flag to
7823 * This is the first release with [experimental support for linking
7824 with the MSVC linker and lib C on Windows (instead of using the GNU
7825 variants via MinGW)][win]. It is yet recommended only for the most
7826 intrepid Rustaceans.
7827 * Benchmark compilations are showing a 30% improvement in
7828 bootstrapping over 1.1.
7833 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7834 unicode case mapping, which is a previously-planned change in
7835 behavior and considered a bugfix.
7836 * [`mem::align_of`] now specifies [the *minimum alignment* for
7837 T][align], which is usually the alignment programs are interested
7838 in, and the same value reported by clang's
7839 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7841 * [The `#[packed]` attribute is no longer silently accepted by the
7842 compiler][packed]. This attribute did nothing and code that
7843 mentioned it likely did not work as intended.
7844 * Associated type defaults are [now behind the
7845 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7846 defaults *did not work*, but could be mentioned syntactically. As
7847 such this breakage has minimal impact.
7852 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7853 matching against dereferenceable values.
7858 * The [`Extend`] trait, which grows a collection from an iterator, is
7859 implemented over iterators of references, for `String`, `Vec`,
7860 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7861 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7862 * The [`iter::once`] function returns an iterator that yields a single
7863 element, and [`iter::empty`] returns an iterator that yields no
7865 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7866 over substring matches.
7867 * [`Cell`] and [`RefCell`] both implement `Eq`.
7868 * A number of methods for wrapping arithmetic are added to the
7869 integral types, [`wrapping_div`], [`wrapping_rem`],
7870 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7871 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7872 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7873 type.. It is illegal for the default arithmetic operations in Rust
7874 to overflow; the desire to wrap must be explicit.
7875 * The `{:#?}` formatting specifier [displays the alternate,
7876 pretty-printed][debugfmt] form of the `Debug` formatter. This
7877 feature was actually introduced prior to 1.0 with little
7879 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7880 for writing data to formatted strings, similar to [`io::Write`].
7881 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7882 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7883 are used by code generators to emit implementations of [`Debug`].
7884 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7885 methods that convert case, following Unicode case mapping.
7886 * It is now easier to handle poisoned locks. The [`PoisonError`]
7887 type, returned by failing lock operations, exposes `into_inner`,
7888 `get_ref`, and `get_mut`, which all give access to the inner lock
7889 guard, and allow the poisoned lock to continue to operate. The
7890 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7891 poisoned lock without attempting to take the lock.
7892 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7893 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7894 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7895 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7897 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7903 * `rustc` employs smarter heuristics for guessing at [typos].
7904 * `rustc` emits more efficient code for [no-op conversions between
7905 unsafe pointers][nop].
7906 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7907 resulting in faster compile times and smaller code.
7909 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7910 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7911 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7912 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7913 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7914 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7915 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7916 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7917 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7918 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7919 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7920 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7921 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7922 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7923 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7924 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7925 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7926 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7927 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7928 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7929 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7930 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7931 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7932 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7933 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7934 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7935 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7936 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7937 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7938 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7939 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7940 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7941 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7942 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7943 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7944 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7945 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7946 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7947 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7948 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7949 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7950 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7951 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7952 [align]: https://github.com/rust-lang/rust/pull/25646
7953 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7954 [typos]: https://github.com/rust-lang/rust/pull/26087
7955 [nop]: https://github.com/rust-lang/rust/pull/26336
7956 [fat]: https://github.com/rust-lang/rust/pull/26411
7957 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7958 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7959 [packed]: https://github.com/rust-lang/rust/pull/25541
7960 [ad]: https://github.com/rust-lang/rust/pull/27382
7961 [win]: https://github.com/rust-lang/rust/pull/25350
7963 Version 1.1.0 (2015-06-25)
7964 =========================
7966 * ~850 changes, numerous bugfixes
7971 * The [`std::fs` module has been expanded][fs] to expand the set of
7972 functionality exposed:
7973 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7974 don't incur a syscall on some platforms.
7975 * A `symlink_metadata` function has been added.
7976 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7977 access to all underlying information.
7978 * The compiler now contains extended explanations of many errors. When an error
7979 with an explanation occurs the compiler suggests using the `--explain` flag
7980 to read the explanation. Error explanations are also [available online][err-index].
7981 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7982 well as other work, the time to bootstrap the compiler decreased by
7988 * The [`str::split_whitespace`] method splits a string on unicode
7989 whitespace boundaries.
7990 * On both Windows and Unix, new extension traits provide conversion of
7991 I/O types to and from the underlying system handles. On Unix, these
7992 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7993 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7994 `TcpListener`, and `UpdSocket`. Further implementations for
7995 `std::process` will be stabilized later.
7996 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7997 Windows, symlinks can be created with
7998 `std::os::windows::symlink_dir` and
7999 `std::os::windows::symlink_file`.
8000 * The `mpsc::Receiver` type can now be converted into an iterator with
8001 `into_iter` on the [`IntoIterator`] trait.
8002 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8003 implementation of the [`From`] trait.
8004 * The `Debug` implementation for `RangeFull` [creates output that is
8005 more consistent with other implementations][rf].
8006 * [`Debug` is implemented for `File`][file].
8007 * The `Default` implementation for `Arc` [no longer requires `Sync +
8009 * [The `Iterator` methods `count`, `nth`, and `last` have been
8010 overridden for slices to have O(1) performance instead of O(n)][si].
8011 * Incorrect handling of paths on Windows has been improved in both the
8012 compiler and the standard library.
8013 * [`AtomicPtr` gained a `Default` implementation][ap].
8014 * In accordance with Rust's policy on arithmetic overflow `abs` now
8015 [panics on overflow when debug assertions are enabled][abs].
8016 * The [`Cloned`] iterator, which was accidentally left unstable for
8017 1.0 [has been stabilized][c].
8018 * The [`Incoming`] iterator, which iterates over incoming TCP
8019 connections, and which was accidentally unnamable in 1.0, [is now
8020 properly exported][inc].
8021 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8022 `sift_up` or `sift_down` panic][bh].
8023 * The [`split_off`] method of `LinkedList` [no longer corrupts
8024 the list in certain scenarios][ll].
8029 * Type checking performance [has improved notably][sk] with
8030 [multiple improvements][pre].
8031 * The compiler [suggests code changes][ch] for more errors.
8032 * rustc and it's build system have experimental support for [building
8033 toolchains against MUSL][m] instead of glibc on Linux.
8034 * The compiler defines the `target_env` cfg value, which is used for
8035 distinguishing toolchains that are otherwise for the same
8036 platform. Presently this is set to `gnu` for common GNU Linux
8037 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8038 * The [`cargo rustc`][crc] command invokes a build with custom flags
8040 * [Android executables are always position independent][pie].
8041 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8044 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8045 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8046 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8047 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8048 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8049 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8050 [rf]: https://github.com/rust-lang/rust/pull/24491
8051 [err-index]: https://doc.rust-lang.org/error-index.html
8052 [sk]: https://github.com/rust-lang/rust/pull/24615
8053 [pre]: https://github.com/rust-lang/rust/pull/25323
8054 [file]: https://github.com/rust-lang/rust/pull/24598
8055 [ch]: https://github.com/rust-lang/rust/pull/24683
8056 [arc]: https://github.com/rust-lang/rust/pull/24695
8057 [si]: https://github.com/rust-lang/rust/pull/24701
8058 [ap]: https://github.com/rust-lang/rust/pull/24834
8059 [m]: https://github.com/rust-lang/rust/pull/24777
8060 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8061 [crc]: https://github.com/rust-lang/cargo/pull/1568
8062 [pie]: https://github.com/rust-lang/rust/pull/24953
8063 [abs]: https://github.com/rust-lang/rust/pull/25441
8064 [c]: https://github.com/rust-lang/rust/pull/25496
8065 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8066 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8067 [inc]: https://github.com/rust-lang/rust/pull/25522
8068 [bh]: https://github.com/rust-lang/rust/pull/25856
8069 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8070 [ll]: https://github.com/rust-lang/rust/pull/26022
8071 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8072 [drop]: https://github.com/rust-lang/rust/pull/24935
8074 Version 1.0.0 (2015-05-15)
8075 ========================
8077 * ~1500 changes, numerous bugfixes
8082 * The vast majority of the standard library is now `#[stable]`. It is
8083 no longer possible to use unstable features with a stable build of
8085 * Many popular crates on [crates.io] now work on the stable release
8087 * Arithmetic on basic integer types now [checks for overflow in debug
8093 * Several [restrictions have been added to trait coherence][coh] in
8094 order to make it easier for upstream authors to change traits
8095 without breaking downstream code.
8096 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8097 improve error messages and macro behavior. For example, `0b1234` is
8098 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8099 * Trait bounds [are always invariant][inv], eliminating the need for
8100 the `PhantomFn` and `MarkerTrait` lang items, which have been
8102 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8103 "foo" as bar` syntax has been replaced with `extern crate foo as
8104 bar`, and Cargo now automatically translates "-" in *package* names
8105 to underscore for the crate name.
8106 * [Lifetime shadowing is an error][lt].
8107 * [`Send` no longer implies `'static`][send-rfc].
8108 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8109 `MyType::default()`.
8110 * Primitive types [now have inherent methods][prim-inherent],
8111 obviating the need for extension traits like `SliceExt`.
8112 * Methods with `Self: Sized` in their `where` clause are [considered
8113 object-safe][self-sized], allowing many extension traits like
8114 `IteratorExt` to be merged into the traits they extended.
8115 * You can now [refer to associated types][assoc-where] whose
8116 corresponding trait bounds appear only in a `where` clause.
8117 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8118 like `Send` and `Sync` are now library-defined.
8119 * A [Reflect trait][reflect] was introduced, which means that
8120 downcasting via the `Any` trait is effectively limited to concrete
8121 types. This helps retain the potentially-important "parametricity"
8122 property: generic code cannot behave differently for different type
8123 arguments except in minor ways.
8124 * The `unsafe_destructor` feature is now deprecated in favor of the
8125 [new `dropck`][dropck]. This change is a major reduction in unsafe
8131 * The `thread_local` module [has been renamed to `std::thread`][th].
8132 * The methods of `IteratorExt` [have been moved to the `Iterator`
8134 * Several traits that implement Rust's conventions for type
8135 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8136 [centralized in the `std::convert` module][con].
8137 * The `FromError` trait [was removed in favor of `From`][fe].
8138 * The basic sleep function [has moved to
8139 `std::thread::sleep_ms`][slp].
8140 * The `splitn` function now takes an `n` parameter that represents the
8141 number of items yielded by the returned iterator [instead of the
8142 number of 'splits'][spl].
8143 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8144 * [Derived implementations of `PartialOrd` now order enums according
8145 to their explicitly-assigned discriminants][po].
8146 * [Methods for searching strings are generic over `Pattern`s][pat],
8147 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8149 * [In method resolution, object methods are resolved before inherent
8151 * [`String::from_str` has been deprecated in favor of the `From` impl,
8152 `String::from`][sf].
8153 * [`io::Error` implements `Sync`][ios].
8154 * [The `words` method on `&str` has been replaced with
8155 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8157 * The new path and IO modules are complete and `#[stable]`. This
8158 was the major library focus for this cycle.
8159 * The path API was [revised][path-normalize] to normalize `.`,
8160 adjusting the tradeoffs in favor of the most common usage.
8161 * A large number of remaining APIs in `std` were also stabilized
8162 during this cycle; about 75% of the non-deprecated API surface
8164 * The new [string pattern API][string-pattern] landed, which makes
8165 the string slice API much more internally consistent and flexible.
8166 * A new set of [generic conversion traits][conversion] replaced
8167 many existing ad hoc traits.
8168 * Generic numeric traits were [completely removed][num-traits]. This
8169 was made possible thanks to inherent methods for primitive types,
8170 and the removal gives maximal flexibility for designing a numeric
8171 hierarchy in the future.
8172 * The `Fn` traits are now related via [inheritance][fn-inherit]
8173 and provide ergonomic [blanket implementations][fn-blanket].
8174 * The `Index` and `IndexMut` traits were changed to
8175 [take the index by value][index-value], enabling code like
8176 `hash_map["string"]` to work.
8177 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8178 `Copy` data is known to be `Clone` as well.
8183 * Many errors now have extended explanations that can be accessed with
8184 the `--explain` flag to `rustc`.
8185 * Many new examples have been added to the standard library
8187 * rustdoc has received a number of improvements focused on completion
8189 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8190 * Much headway was made on ecosystem-wide CI, making it possible
8191 to [compare builds for breakage][ci-compare].
8194 [crates.io]: http://crates.io
8195 [clo]: https://github.com/rust-lang/rust/pull/24034
8196 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8197 [con]: https://github.com/rust-lang/rust/pull/23875
8198 [cr]: https://github.com/rust-lang/rust/pull/23419
8199 [fe]: https://github.com/rust-lang/rust/pull/23879
8200 [ie]: https://github.com/rust-lang/rust/pull/23300
8201 [inv]: https://github.com/rust-lang/rust/pull/23938
8202 [ios]: https://github.com/rust-lang/rust/pull/24133
8203 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8204 [lt]: https://github.com/rust-lang/rust/pull/24057
8205 [meth]: https://github.com/rust-lang/rust/pull/24056
8206 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8207 [po]: https://github.com/rust-lang/rust/pull/24270
8208 [sf]: https://github.com/rust-lang/rust/pull/24517
8209 [slp]: https://github.com/rust-lang/rust/pull/23949
8210 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8211 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8212 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8213 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8214 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8215 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8216 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8217 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8218 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8219 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8220 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8221 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8222 [reflect]: https://github.com/rust-lang/rust/pull/23712
8223 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8224 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8225 [index-value]: https://github.com/rust-lang/rust/pull/23601
8226 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8227 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8228 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8229 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8230 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8231 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8234 Version 1.0.0-alpha.2 (2015-02-20)
8235 =====================================
8237 * ~1300 changes, numerous bugfixes
8241 * The various I/O modules were [overhauled][io-rfc] to reduce
8242 unnecessary abstractions and provide better interoperation with
8243 the underlying platform. The old `io` module remains temporarily
8245 * The standard library now [participates in feature gating][feat],
8246 so use of unstable libraries now requires a `#![feature(...)]`
8247 attribute. The impact of this change is [described on the
8248 forum][feat-forum]. [RFC][feat-rfc].
8252 * `for` loops [now operate on the `IntoIterator` trait][into],
8253 which eliminates the need to call `.iter()`, etc. to iterate
8254 over collections. There are some new subtleties to remember
8255 though regarding what sort of iterators various types yield, in
8256 particular that `for foo in bar { }` yields values from a move
8257 iterator, destroying the original collection. [RFC][into-rfc].
8258 * Objects now have [default lifetime bounds][obj], so you don't
8259 have to write `Box<Trait+'static>` when you don't care about
8260 storing references. [RFC][obj-rfc].
8261 * In types that implement `Drop`, [lifetimes must outlive the
8262 value][drop]. This will soon make it possible to safely
8263 implement `Drop` for types where `#[unsafe_destructor]` is now
8264 required. Read the [gorgeous RFC][drop-rfc] for details.
8265 * The fully qualified <T as Trait>::X syntax lets you set the Self
8266 type for a trait method or associated type. [RFC][ufcs-rfc].
8267 * References to types that implement `Deref<U>` now [automatically
8268 coerce to references][deref] to the dereferenced type `U`,
8269 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8270 should eliminate many unsightly uses of `&*`, as when converting
8271 from references to vectors into references to
8272 slices. [RFC][deref-rfc].
8273 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8274 `|:|`) is obsolete and closure kind is inferred from context.
8275 * [`Self` is a keyword][Self].
8279 * The `Show` and `String` formatting traits [have been
8280 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8281 their related purposes. Automatically getting a string
8282 conversion to use with `format!("{:?}", something_to_debug)` is
8283 now written `#[derive(Debug)]`.
8284 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8285 OsStr}`, provide strings in platform-specific encodings for easier
8286 interop with system APIs. [RFC][osstr-rfc].
8287 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8288 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8289 creating raw pointers.
8293 * Certain long error messages of the form 'expected foo found bar'
8294 are now [split neatly across multiple
8295 lines][multiline]. Examples in the PR.
8296 * On Unix Rust can be [uninstalled][un] by running
8297 `/usr/local/lib/rustlib/uninstall.sh`.
8298 * The `#[rustc_on_unimplemented]` attribute, requiring the
8299 'on_unimplemented' feature, lets rustc [display custom error
8300 messages when a trait is expected to be implemented for a type
8305 * Rust is tested against a [LALR grammar][lalr], which parses
8306 almost all the Rust files that rustc does.
8308 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8309 [close]: https://github.com/rust-lang/rust/pull/21843
8310 [deref]: https://github.com/rust-lang/rust/pull/21351
8311 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8312 [drop]: https://github.com/rust-lang/rust/pull/21972
8313 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8314 [feat]: https://github.com/rust-lang/rust/pull/21248
8315 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8316 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8317 [fmt]: https://github.com/rust-lang/rust/pull/21457
8318 [into]: https://github.com/rust-lang/rust/pull/20790
8319 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8320 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8321 [lalr]: https://github.com/rust-lang/rust/pull/21452
8322 [multiline]: https://github.com/rust-lang/rust/pull/19870
8323 [obj]: https://github.com/rust-lang/rust/pull/22230
8324 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8325 [onun]: https://github.com/rust-lang/rust/pull/20889
8326 [osstr]: https://github.com/rust-lang/rust/pull/21488
8327 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8328 [Self]: https://github.com/rust-lang/rust/pull/22158
8329 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8330 [un]: https://github.com/rust-lang/rust/pull/22256
8333 Version 1.0.0-alpha (2015-01-09)
8334 ==================================
8336 * ~2400 changes, numerous bugfixes
8340 * The language itself is considered feature complete for 1.0,
8341 though there will be many usability improvements and bugfixes
8342 before the final release.
8343 * Nearly 50% of the public API surface of the standard library has
8344 been declared 'stable'. Those interfaces are unlikely to change
8346 * The long-running debate over integer types has been
8347 [settled][ints]: Rust will ship with types named `isize` and
8348 `usize`, rather than `int` and `uint`, for pointer-sized
8349 integers. Guidelines will be rolled out during the alpha cycle.
8350 * Most crates that are not `std` have been moved out of the Rust
8351 distribution into the Cargo ecosystem so they can evolve
8352 separately and don't need to be stabilized as quickly, including
8353 'time', 'getopts', 'num', 'regex', and 'term'.
8354 * Documentation continues to be expanded with more API coverage, more
8355 examples, and more in-depth explanations. The guides have been
8356 consolidated into [The Rust Programming Language][trpl].
8357 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8358 * All official Rust binary installers now come with [Cargo], the
8359 Rust package manager.
8363 * Closures have been [completely redesigned][unboxed] to be
8364 implemented in terms of traits, can now be used as generic type
8365 bounds and thus monomorphized and inlined, or via an opaque
8366 pointer (boxed) as in the old system. The new system is often
8367 referred to as 'unboxed' closures.
8368 * Traits now support [associated types][assoc], allowing families
8369 of related types to be defined together and used generically in
8371 * Enum variants are [namespaced by their type names][enum].
8372 * [`where` clauses][where] provide a more versatile and attractive
8373 syntax for specifying generic bounds, though the previous syntax
8375 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8377 * Rust [no longer has a runtime][rt] of any description, and only
8378 supports OS threads, not green threads.
8379 * At long last, Rust has been overhauled for 'dynamically-sized
8380 types' ([DST]), which integrates 'fat pointers' (object types,
8381 arrays, and `str`) more deeply into the type system, making it
8383 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8384 `..j` that produce range types and which, when combined with the
8385 `Index` operator and multidispatch, leads to a convenient slice
8387 * The new range syntax revealed an ambiguity in the fixed-length
8388 array syntax, so now fixed length arrays [are written `[T;
8390 * The `Copy` trait is no longer implemented automatically. Unsafe
8391 pointers no longer implement `Sync` and `Send` so types
8392 containing them don't automatically either. `Sync` and `Send`
8393 are now 'unsafe traits' so one can "forcibly" implement them via
8394 `unsafe impl` if a type confirms to the requirements for them
8395 even though the internals do not (e.g. structs containing unsafe
8396 pointers like `Arc`). These changes are intended to prevent some
8397 footguns and are collectively known as [opt-in built-in
8398 traits][oibit] (though `Sync` and `Send` will soon become pure
8399 library types unknown to the compiler).
8400 * Operator traits now take their operands [by value][ops], and
8401 comparison traits can use multidispatch to compare one type
8402 against multiple other types, allowing e.g. `String` to be
8403 compared with `&str`.
8404 * `if let` and `while let` are no longer feature-gated.
8405 * Rust has adopted a more [uniform syntax for escaping unicode
8406 characters][unicode].
8407 * `macro_rules!` [has been declared stable][mac]. Though it is a
8408 flawed system it is sufficiently popular that it must be usable
8409 for 1.0. Effort has gone into [future-proofing][mac-future] it
8410 in ways that will allow other macro systems to be developed in
8411 parallel, and won't otherwise impact the evolution of the
8413 * The prelude has been [pared back significantly][prelude] such
8414 that it is the minimum necessary to support the most pervasive
8415 code patterns, and through [generalized where clauses][where]
8416 many of the prelude extension traits have been consolidated.
8417 * Rust's rudimentary reflection [has been removed][refl], as it
8418 incurred too much code generation for little benefit.
8419 * [Struct variants][structvars] are no longer feature-gated.
8420 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8421 known as 'higher-ranked trait bounds', this crucially allows
8422 unboxed closures to work.
8423 * Macros invocations surrounded by parens or square brackets and
8424 not terminated by a semicolon are [parsed as
8425 expressions][macros], which makes expressions like `vec![1i32,
8426 2, 3].len()` work as expected.
8427 * Trait objects now implement their traits automatically, and
8428 traits that can be coerced to objects now must be [object
8430 * Automatically deriving traits is now done with `#[derive(...)]`
8431 not `#[deriving(...)]` for [consistency with other naming
8432 conventions][derive].
8433 * Importing the containing module or enum at the same time as
8434 items or variants they contain is [now done with `self` instead
8435 of `mod`][self], as in use `foo::{self, bar}`
8436 * Glob imports are no longer feature-gated.
8437 * The `box` operator and `box` patterns have been feature-gated
8438 pending a redesign. For now unique boxes should be allocated
8439 like other containers, with `Box::new`.
8443 * A [series][coll1] of [efforts][coll2] to establish
8444 [conventions][coll3] for collections types has resulted in API
8445 improvements throughout the standard library.
8446 * New [APIs for error handling][err] provide ergonomic interop
8447 between error types, and [new conventions][err-conv] describe
8448 more clearly the recommended error handling strategies in Rust.
8449 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8450 it is easier to discuss failure in the context of error handling
8451 without making clarifications as to whether you are referring to
8452 the 'fail' macro or failure more generally.
8453 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8454 syscall when available.
8455 * The 'serialize' crate has been renamed 'rustc-serialize' and
8456 moved out of the distribution to Cargo. Although it is widely
8457 used now, it is expected to be superseded in the near future.
8458 * The `Show` formatter, typically implemented with
8459 `#[derive(Show)]` is [now requested with the `{:?}`
8460 specifier][show] and is intended for use by all types, for uses
8461 such as `println!` debugging. The new `String` formatter must be
8462 implemented by hand, uses the `{}` specifier, and is intended
8463 for full-fidelity conversions of things that can logically be
8464 represented as strings.
8468 * [Flexible target specification][flex] allows rustc's code
8469 generation to be configured to support otherwise-unsupported
8471 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8472 respective debuggers with Rust-appropriate pretty-printing.
8473 * The Windows installation of Rust is distributed with the
8474 MinGW components currently required to link binaries on that
8479 * Nullable enum optimizations have been extended to more types so
8480 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8481 space than the inner types themselves.
8482 * Work has begun on supporting AArch64.
8484 [Cargo]: https://crates.io
8485 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8486 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8487 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8488 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8489 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8490 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8491 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8492 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8493 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8494 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8495 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8496 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8497 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8498 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8499 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8500 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8501 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8502 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8503 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8504 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8505 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8506 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8507 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8508 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8509 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8510 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8511 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8512 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8513 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8514 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8515 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8516 [trpl]: https://doc.rust-lang.org/book/index.html
8517 [rbe]: http://rustbyexample.com/
8520 Version 0.12.0 (2014-10-09)
8521 =============================
8523 * ~1900 changes, numerous bugfixes
8527 * The introductory documentation (now called The Rust Guide) has
8528 been completely rewritten, as have a number of supplementary
8530 * Rust's package manager, Cargo, continues to improve and is
8531 sometimes considered to be quite awesome.
8532 * Many API's in `std` have been reviewed and updated for
8533 consistency with the in-development Rust coding
8534 guidelines. The standard library documentation tracks
8535 stabilization progress.
8536 * Minor libraries have been moved out-of-tree to the rust-lang org
8537 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8538 be installed with Cargo.
8539 * Lifetime elision allows lifetime annotations to be left off of
8540 function declarations in many common scenarios.
8541 * Rust now works on 64-bit Windows.
8544 * Indexing can be overloaded with the `Index` and `IndexMut`
8546 * The `if let` construct takes a branch only if the `let` pattern
8547 matches, currently behind the 'if_let' feature gate.
8548 * 'where clauses', a more flexible syntax for specifying trait
8549 bounds that is more aesthetic, have been added for traits and
8550 free functions. Where clauses will in the future make it
8551 possible to constrain associated types, which would be
8552 impossible with the existing syntax.
8553 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8554 the 'slicing_syntax' feature gate, and can be overloaded with
8555 the `Slice` or `SliceMut` traits.
8556 * The syntax for matching of sub-slices has been changed to use a
8557 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8558 consistency with other uses of `..` and to future-proof
8559 potential additional uses of the syntax.
8560 * The syntax for matching inclusive ranges in patterns has changed
8561 from `0..3` to `0...4` to be consistent with the exclusive range
8563 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8564 c]`) has been put behind the 'advanced_slice_patterns' feature
8565 gate and may be removed in the future.
8566 * Components of tuples and tuple structs can be extracted using
8567 the `value.0` syntax, currently behind the `tuple_indexing`
8569 * The `#[crate_id]` attribute is no longer supported; versioning
8570 is handled by the package manager.
8571 * Renaming crate imports are now written `extern crate foo as bar`
8572 instead of `extern crate bar = foo`.
8573 * Renaming use statements are now written `use foo as bar` instead
8575 * `let` and `match` bindings and argument names in macros are now
8577 * The new, more efficient, closure types ('unboxed closures') have
8578 been added under a feature gate, 'unboxed_closures'. These will
8579 soon replace the existing closure types, once higher-ranked
8580 trait lifetimes are added to the language.
8581 * `move` has been added as a keyword, for indicating closures
8582 that capture by value.
8583 * Mutation and assignment is no longer allowed in pattern guards.
8584 * Generic structs and enums can now have trait bounds.
8585 * The `Share` trait is now called `Sync` to free up the term
8586 'shared' to refer to 'shared reference' (the default reference
8588 * Dynamically-sized types have been mostly implemented,
8589 unifying the behavior of fat-pointer types with the rest of the
8591 * As part of dynamically-sized types, the `Sized` trait has been
8592 introduced, which qualifying types implement by default, and
8593 which type parameters expect by default. To specify that a type
8594 parameter does not need to be sized, write `<Sized? T>`. Most
8595 types are `Sized`, notable exceptions being unsized arrays
8596 (`[T]`) and trait types.
8597 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8598 * Lifetime bounds can now be applied to type parameters and object
8600 * The old, reference counted GC type, `Gc<T>` which was once
8601 denoted by the `@` sigil, has finally been removed. GC will be
8602 revisited in the future.
8605 * Library documentation has been improved for a number of modules.
8606 * Bit-vectors, collections::bitv has been modernized.
8607 * The url crate is deprecated in favor of
8608 http://github.com/servo/rust-url, which can be installed with
8610 * Most I/O stream types can be cloned and subsequently closed from
8612 * A `std::time::Duration` type has been added for use in I/O
8613 methods that rely on timers, as well as in the 'time' crate's
8614 `Timespec` arithmetic.
8615 * The runtime I/O abstraction layer that enabled the green thread
8616 scheduler to do non-thread-blocking I/O has been removed, along
8617 with the libuv-based implementation employed by the green thread
8618 scheduler. This will greatly simplify the future I/O work.
8619 * `collections::btree` has been rewritten to have a more
8620 idiomatic and efficient design.
8623 * rustdoc output now indicates the stability levels of API's.
8624 * The `--crate-name` flag can specify the name of the crate
8625 being compiled, like `#[crate_name]`.
8626 * The `-C metadata` specifies additional metadata to hash into
8627 symbol names, and `-C extra-filename` specifies additional
8628 information to put into the output filename, for use by the
8629 package manager for versioning.
8630 * debug info generation has continued to improve and should be
8631 more reliable under both gdb and lldb.
8632 * rustc has experimental support for compiling in parallel
8633 using the `-C codegen-units` flag.
8634 * rustc no longer encodes rpath information into binaries by
8638 * Stack usage has been optimized with LLVM lifetime annotations.
8639 * Official Rust binaries on Linux are more compatible with older
8640 kernels and distributions, built on CentOS 5.10.
8643 Version 0.11.0 (2014-07-02)
8644 ==========================
8646 * ~1700 changes, numerous bugfixes
8649 * ~[T] has been removed from the language. This type is superseded by
8651 * ~str has been removed from the language. This type is superseded by
8653 * ~T has been removed from the language. This type is superseded by the
8655 * @T has been removed from the language. This type is superseded by the
8656 standard library's std::gc::Gc<T> type.
8657 * Struct fields are now all private by default.
8658 * Vector indices and shift amounts are both required to be a `uint`
8659 instead of any integral type.
8660 * Byte character, byte string, and raw byte string literals are now all
8661 supported by prefixing the normal literal with a `b`.
8662 * Multiple ABIs are no longer allowed in an ABI string
8663 * The syntax for lifetimes on closures/procedures has been tweaked
8664 slightly: `<'a>|A, B|: 'b + K -> T`
8665 * Floating point modulus has been removed from the language; however it
8666 is still provided by a library implementation.
8667 * Private enum variants are now disallowed.
8668 * The `priv` keyword has been removed from the language.
8669 * A closure can no longer be invoked through a &-pointer.
8670 * The `use foo, bar, baz;` syntax has been removed from the language.
8671 * The transmute intrinsic no longer works on type parameters.
8672 * Statics now allow blocks/items in their definition.
8673 * Trait bounds are separated from objects with + instead of : now.
8674 * Objects can no longer be read while they are mutably borrowed.
8675 * The address of a static is now marked as insignificant unless the
8676 #[inline(never)] attribute is placed it.
8677 * The #[unsafe_destructor] attribute is now behind a feature gate.
8678 * Struct literals are no longer allowed in ambiguous positions such as
8679 if, while, match, and for..in.
8680 * Declaration of lang items and intrinsics are now feature-gated by
8682 * Integral literals no longer default to `int`, and floating point
8683 literals no longer default to `f64`. Literals must be suffixed with an
8684 appropriate type if inference cannot determine the type of the
8686 * The Box<T> type is no longer implicitly borrowed to &mut T.
8687 * Procedures are now required to not capture borrowed references.
8690 * The standard library is now a "facade" over a number of underlying
8691 libraries. This means that development on the standard library should
8692 be speedier due to smaller crates, as well as a clearer line between
8694 * A new library, libcore, lives under the standard library's facade
8695 which is Rust's "0-assumption" library, suitable for embedded and
8696 kernel development for example.
8697 * A regex crate has been added to the standard distribution. This crate
8698 includes statically compiled regular expressions.
8699 * The unwrap/unwrap_err methods on Result require a Show bound for
8700 better error messages.
8701 * The return types of the std::comm primitives have been centralized
8702 around the Result type.
8703 * A number of I/O primitives have gained the ability to time out their
8705 * A number of I/O primitives have gained the ability to close their
8706 reading/writing halves to cancel pending operations.
8707 * Reverse iterator methods have been removed in favor of `rev()` on
8708 their forward-iteration counterparts.
8709 * A bitflags! macro has been added to enable easy interop with C and
8710 management of bit flags.
8711 * A debug_assert! macro is now provided which is disabled when
8712 `--cfg ndebug` is passed to the compiler.
8713 * A graphviz crate has been added for creating .dot files.
8714 * The std::cast module has been migrated into std::mem.
8715 * The std::local_data api has been migrated from freestanding functions
8716 to being based on methods.
8717 * The Pod trait has been renamed to Copy.
8718 * jemalloc has been added as the default allocator for types.
8719 * The API for allocating memory has been changed to use proper alignment
8720 and sized deallocation
8721 * Connecting a TcpStream or binding a TcpListener is now based on a
8722 string address and a u16 port. This allows connecting to a hostname as
8724 * The Reader trait now contains a core method, read_at_least(), which
8725 correctly handles many repeated 0-length reads.
8726 * The process-spawning API is now centered around a builder-style
8728 * The :? printing qualifier has been moved from the standard library to
8729 an external libdebug crate.
8730 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8731 have been renamed to Eq/Ord.
8732 * The select/plural methods have been removed from format!. The escapes
8733 for { and } have also changed from \{ and \} to {{ and }},
8735 * The TaskBuilder API has been re-worked to be a true builder, and
8736 extension traits for spawning native/green tasks have been added.
8739 * All breaking changes to the language or libraries now have their
8740 commit message annotated with `[breaking-change]` to allow for easy
8741 discovery of breaking changes.
8742 * The compiler will now try to suggest how to annotate lifetimes if a
8743 lifetime-related error occurs.
8744 * Debug info continues to be improved greatly with general bug fixes and
8745 better support for situations like link time optimization (LTO).
8746 * Usage of syntax extensions when cross-compiling has been fixed.
8747 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8748 -fdata-sections and --gc-sections has been enabled by default
8749 * The compiler is now stricter about where it will load module files
8750 from when a module is declared via `mod foo;`.
8751 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8752 Syntax extensions are now discovered via a "plugin registrar" type
8753 which will be extended in the future to other various plugins.
8754 * Lints have been restructured to allow for dynamically loadable lints.
8755 * A number of rustdoc improvements:
8756 * The HTML output has been visually redesigned.
8757 * Markdown is now powered by hoedown instead of sundown.
8758 * Searching heuristics have been greatly improved.
8759 * The search index has been reduced in size by a great amount.
8760 * Cross-crate documentation via `pub use` has been greatly improved.
8761 * Primitive types are now hyperlinked and documented.
8762 * Documentation has been moved from static.rust-lang.org/doc to
8764 * A new sandbox, play.rust-lang.org, is available for running and
8765 sharing rust code examples on-line.
8766 * Unused attributes are now more robustly warned about.
8767 * The dead_code lint now warns about unused struct fields.
8768 * Cross-compiling to iOS is now supported.
8769 * Cross-compiling to mipsel is now supported.
8770 * Stability attributes are now inherited by default and no longer apply
8771 to intra-crate usage, only inter-crate usage.
8772 * Error message related to non-exhaustive match expressions have been
8776 Version 0.10 (2014-04-03)
8777 =========================
8779 * ~1500 changes, numerous bugfixes
8782 * A new RFC process is now in place for modifying the language.
8783 * Patterns with `@`-pointers have been removed from the language.
8784 * Patterns with unique vectors (`~[T]`) have been removed from the
8786 * Patterns with unique strings (`~str`) have been removed from the
8788 * `@str` has been removed from the language.
8789 * `@[T]` has been removed from the language.
8790 * `@self` has been removed from the language.
8791 * `@Trait` has been removed from the language.
8792 * Headers on `~` allocations which contain `@` boxes inside the type for
8793 reference counting have been removed.
8794 * The semantics around the lifetimes of temporary expressions have changed,
8795 see #3511 and #11585 for more information.
8796 * Cross-crate syntax extensions are now possible, but feature gated. See
8797 #11151 for more information. This includes both `macro_rules!` macros as
8798 well as syntax extensions such as `format!`.
8799 * New lint modes have been added, and older ones have been turned on to be
8801 * Unnecessary parentheses
8804 * Uppercase variables
8805 * Publicly visible private types
8806 * `#[deriving]` with raw pointers
8807 * Unsafe functions can no longer be coerced to closures.
8808 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8809 * The `#[simd]` attribute is now behind a feature gate.
8810 * Visibility is no longer allowed on `extern crate` statements, and
8811 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8812 * Trailing commas are now allowed in argument lists and tuple patterns.
8813 * The `do` keyword has been removed, it is now a reserved keyword.
8814 * Default type parameters have been implemented, but are feature gated.
8815 * Borrowed variables through captures in closures are now considered soundly.
8816 * `extern mod` is now `extern crate`
8817 * The `Freeze` trait has been removed.
8818 * The `Share` trait has been added for types that can be shared among
8820 * Labels in macros are now hygienic.
8821 * Expression/statement macro invocations can be delimited with `{}` now.
8822 * Treatment of types allowed in `static mut` locations has been tweaked.
8823 * The `*` and `.` operators are now overloadable through the `Deref` and
8825 * `~Trait` and `proc` no longer have `Send` bounds by default.
8826 * Partial type hints are now supported with the `_` type marker.
8827 * An `Unsafe` type was introduced for interior mutability. It is now
8828 considered undefined to transmute from `&T` to `&mut T` without using the
8830 * The #[linkage] attribute was implemented for extern statics/functions.
8831 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8832 * `Pod` was renamed to `Copy`.
8835 * The `libextra` library has been removed. It has now been decomposed into
8836 component libraries with smaller and more focused nuggets of
8837 functionality. The full list of libraries can be found on the
8838 documentation index page.
8839 * std: `std::condition` has been removed. All I/O errors are now propagated
8840 through the `Result` type. In order to assist with error handling, a
8841 `try!` macro for unwrapping errors with an early return and a lint for
8842 unused results has been added. See #12039 for more information.
8843 * std: The `vec` module has been renamed to `slice`.
8844 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8845 This will become the only growable vector in the future.
8846 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8847 are now found at `std::io::BufferedReader` instead of
8848 `std::io::buffered::BufferedReader`.
8849 * std: `print` and `println` are no longer in the prelude, the `print!` and
8850 `println!` macros are intended to be used instead.
8851 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8852 attempts to statically prevent cycles.
8853 * std: The standard distribution is adopting the policy of pushing failure
8854 to the user rather than failing in libraries. Many functions (such as
8855 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8856 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8857 deriving mode: `#[deriving(Show)]`.
8858 * std: `ToStr` is now implemented for all types implementing `Show`.
8859 * std: The formatting trait methods now take `&self` instead of `&T`
8860 * std: The `invert()` method on iterators has been renamed to `rev()`
8861 * std: `std::num` has seen a reduction in the genericity of its traits,
8862 consolidating functionality into a few core traits.
8863 * std: Backtraces are now printed on task failure if the environment
8864 variable `RUST_BACKTRACE` is present.
8865 * std: Naming conventions for iterators have been standardized. More details
8866 can be found on the wiki's style guide.
8867 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8868 still implement the function.
8869 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8870 * std: `assert_approx_eq!` has been removed
8871 * std: The `e` and `E` formatting specifiers for floats have been added to
8872 print them in exponential notation.
8873 * std: The `Times` trait has been removed
8874 * std: Indications of variance and opting out of builtin bounds is done
8875 through marker types in `std::kinds::marker` now
8876 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8877 `#[deriving(Hash)]` is now possible.
8878 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8879 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8880 * std: `Chan::new` is now `channel()`.
8881 * std: A new synchronous channel type has been implemented.
8882 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8883 * std: `hashmap` and `trie` have been moved to `libcollections`
8884 * std: `run` has been rolled into `io::process`
8885 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8886 * std: The equality and comparison traits have seen some reorganization.
8887 * std: `rand` has moved to `librand`.
8888 * std: `to_{lower,upper}case` has been implemented for `char`.
8889 * std: Logging has been moved to `liblog`.
8890 * collections: `HashMap` has been rewritten for higher performance and less
8892 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8893 it can be booted manually. The runtime guide has more information and
8895 * native: All I/O functionality except signals has been implemented.
8896 * green: Task spawning with `libgreen` has been optimized with stack caching
8897 and various trimming of code.
8898 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8899 * sync: The `extra::sync` module has been updated to modern rust (and moved
8900 to the `sync` library), tweaking and improving various interfaces while
8901 dropping redundant functionality.
8902 * sync: A new `Barrier` type has been added to the `sync` library.
8903 * sync: An efficient mutex for native and green tasks has been implemented.
8904 * serialize: The `base64` module has seen some improvement. It treats
8905 newlines better, has non-string error values, and has seen general
8907 * fourcc: A `fourcc!` macro was introduced
8908 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8909 hexadecimal literal.
8912 * `rustpkg` has been deprecated and removed from the main repository. Its
8913 replacement, `cargo`, is under development.
8914 * Nightly builds of rust are now available
8915 * The memory usage of rustc has been improved many times throughout this
8917 * The build process supports disabling rpath support for the rustc binary
8919 * Code generation has improved in some cases, giving more information to the
8920 LLVM optimization passes to enable more extensive optimizations.
8921 * Debuginfo compatibility with lldb on OSX has been restored.
8922 * The master branch is now gated on an android bot, making building for
8923 android much more reliable.
8924 * Output flags have been centralized into one `--emit` flag.
8925 * Crate type flags have been centralized into one `--crate-type` flag.
8926 * Codegen flags have been consolidated behind a `-C` flag.
8927 * Linking against outdated crates now has improved error messages.
8928 * Error messages with lifetimes will often suggest how to annotate the
8929 function to fix the error.
8930 * Many more types are documented in the standard library, and new guides
8932 * Many `rustdoc` improvements:
8933 * code blocks are syntax highlighted.
8934 * render standalone markdown files.
8935 * the --test flag tests all code blocks by default.
8936 * exported macros are displayed.
8937 * re-exported types have their documentation inlined at the location of the
8939 * search works across crates that have been rendered to the same output
8943 Version 0.9 (2014-01-09)
8944 ==========================
8946 * ~1800 changes, numerous bugfixes
8949 * The `float` type has been removed. Use `f32` or `f64` instead.
8950 * A new facility for enabling experimental features (feature gating) has
8951 been added, using the crate-level `#[feature(foo)]` attribute.
8952 * Managed boxes (@) are now behind a feature gate
8953 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8954 standard library's `Gc` or `Rc` types instead.
8955 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8956 * Jumping back to the top of a loop is now done with `continue` instead of
8958 * Strings can no longer be mutated through index assignment.
8959 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8960 hash delimiters, as in `r###"foo"###`.
8961 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8963 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8964 * `@fn`s have been removed.
8965 * `do` only works with procs in order to make it obvious what the cost
8967 * Single-element tuple-like structs can no longer be dereferenced to
8968 obtain the inner value. A more comprehensive solution for overloading
8969 the dereference operator will be provided in the future.
8970 * The `#[link(...)]` attribute has been replaced with
8971 `#[crate_id = "name#vers"]`.
8972 * Empty `impl`s must be terminated with empty braces and may not be
8973 terminated with a semicolon.
8974 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8975 no longer has any special meaning.
8976 * The old `fmt!` string formatting macro has been removed.
8977 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8978 `print!` and `println!`.
8979 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8980 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8981 `extern mod foo = "bar"` instead.
8982 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8983 * Macros can have attributes.
8984 * Macros can expand to items with attributes.
8985 * Macros can expand to multiple items.
8986 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8987 * Comments may be nested.
8988 * Values automatically coerce to trait objects they implement, without
8990 * Enum discriminants are no longer an entire word but as small as needed to
8991 contain all the variants. The `repr` attribute can be used to override
8992 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8993 `#[repr(C)]` to match C enums.
8994 * Non-string literals are not allowed in attributes (they never worked).
8995 * The FFI now supports variadic functions.
8996 * Octal numeric literals, as in `0o7777`.
8997 * The `concat!` syntax extension performs compile-time string concatenation.
8998 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8999 removed as Rust no longer uses segmented stacks.
9000 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9001 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9002 not `*`; ignoring remaining fields of a struct is also done with `..`,
9003 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9004 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9005 * `rustc` supports the "system" calling convention, which defaults to the
9006 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9008 * The `type_overflow` lint (default: warn) checks literals for overflow.
9009 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9010 * The `attribute_usage` lint (default: warn) warns about unknown
9012 * The `unknown_features` lint (default: warn) warns about unknown
9014 * The `dead_code` lint (default: warn) checks for dead code.
9015 * Rust libraries can be linked statically to one another
9016 * `#[link_args]` is behind the `link_args` feature gate.
9017 * Native libraries are now linked with `#[link(name = "foo")]`
9018 * Native libraries can be statically linked to a rust crate
9019 (`#[link(name = "foo", kind = "static")]`).
9020 * Native OS X frameworks are now officially supported
9021 (`#[link(name = "foo", kind = "framework")]`).
9022 * The `#[thread_local]` attribute creates thread-local (not task-local)
9023 variables. Currently behind the `thread_local` feature gate.
9024 * The `return` keyword may be used in closures.
9025 * Types that can be copied via a memcpy implement the `Pod` kind.
9026 * The `cfg` attribute can now be used on struct fields and enum variants.
9029 * std: The `option` and `result` API's have been overhauled to make them
9030 simpler, more consistent, and more composable.
9031 * std: The entire `std::io` module has been replaced with one that is
9032 more comprehensive and that properly interfaces with the underlying
9033 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9035 * std: `io::util` contains a number of useful implementations of
9036 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9037 `ZeroReader`, `TeeReader`.
9038 * std: The reference counted pointer type `extra::rc` moved into std.
9039 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9040 just a wrapper around it).
9041 * std: The `Either` type has been removed.
9042 * std: `fmt::Default` can be implemented for any type to provide default
9043 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9044 * std: The `rand` API continues to be tweaked.
9045 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9046 on failure in gdb, is now named `rust_fail`.
9047 * std: The `each_key` and `each_value` methods on `HashMap` have been
9048 replaced by the `keys` and `values` iterators.
9049 * std: Functions dealing with type size and alignment have moved from the
9050 `sys` module to the `mem` module.
9051 * std: The `path` module was written and API changed.
9052 * std: `str::from_utf8` has been changed to cast instead of allocate.
9053 * std: `starts_with` and `ends_with` methods added to vectors via the
9054 `ImmutableEqVector` trait, which is in the prelude.
9055 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9056 if the index is out of bounds.
9057 * std: Task failure no longer propagates between tasks, as the model was
9058 complex, expensive, and incompatible with thread-based tasks.
9059 * std: The `Any` type can be used for dynamic typing.
9060 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9062 * std: Methods that produce iterators generally do not have an `_iter`
9064 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9065 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9066 * std: `util::ignore` renamed to `prelude::drop`.
9067 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9069 * std: `vec::raw` has seen a lot of cleanup and API changes.
9070 * std: The standard library no longer includes any C++ code, and very
9071 minimal C, eliminating the dependency on libstdc++.
9072 * std: Runtime scheduling and I/O functionality has been factored out into
9073 extensible interfaces and is now implemented by two different crates:
9074 libnative, for native threading and I/O; and libgreen, for green threading
9075 and I/O. This paves the way for using the standard library in more limited
9076 embedded environments.
9077 * std: The `comm` module has been rewritten to be much faster, have a
9078 simpler, more consistent API, and to work for both native and green
9080 * std: All libuv dependencies have been moved into the rustuv crate.
9081 * native: New implementations of runtime scheduling on top of OS threads.
9082 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9084 * green: The green thread scheduler and message passing types are almost
9086 * extra: The `flatpipes` module had bitrotted and was removed.
9087 * extra: All crypto functions have been removed and Rust now has a policy of
9088 not reimplementing crypto in the standard library. In the future crypto
9089 will be provided by external crates with bindings to established libraries.
9090 * extra: `c_vec` has been modernized.
9091 * extra: The `sort` module has been removed. Use the `sort` method on
9095 * The `rust` and `rusti` commands have been removed, due to lack of
9097 * `rustdoc` was completely rewritten.
9098 * `rustdoc` can test code examples in documentation.
9099 * `rustpkg` can test packages with the argument, 'test'.
9100 * `rustpkg` supports arbitrary dependencies, including C libraries.
9101 * `rustc`'s support for generating debug info is improved again.
9102 * `rustc` has better error reporting for unbalanced delimiters.
9103 * `rustc`'s JIT support was removed due to bitrot.
9104 * Executables and static libraries can be built with LTO (-Z lto)
9105 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9109 Version 0.8 (2013-09-26)
9110 ============================
9112 * ~2200 changes, numerous bugfixes
9115 * The `for` loop syntax has changed to work with the `Iterator` trait.
9116 * At long last, unwinding works on Windows.
9117 * Default methods are ready for use.
9118 * Many trait inheritance bugs fixed.
9119 * Owned and borrowed trait objects work more reliably.
9120 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9121 * rustc can omit emission of code for the `debug!` macro if it is passed
9123 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9124 for foo.rs, then foo/mod.rs, and will generate an error when both are
9126 * Strings no longer contain trailing nulls. The new `std::c_str` module
9127 provides new mechanisms for converting to C strings.
9128 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9129 * The FFI has been overhauled such that foreign functions are called directly,
9130 instead of through a stack-switching wrapper.
9131 * Calling a foreign function must be done through a Rust function with the
9132 `#[fixed_stack_segment]` attribute.
9133 * The `externfn!` macro can be used to declare both a foreign function and
9134 a `#[fixed_stack_segment]` wrapper at once.
9135 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9136 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9137 * `priv` is disallowed everywhere except for struct fields and enum variants.
9138 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9139 * `ref` bindings in irrefutable patterns work correctly now.
9140 * `char` is now prevented from containing invalid code points.
9141 * Casting to `bool` is no longer allowed.
9142 * `\0` is now accepted as an escape in chars and strings.
9143 * `yield` is a reserved keyword.
9144 * `typeof` is a reserved keyword.
9145 * Crates may be imported by URL with `extern mod foo = "url";`.
9146 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9147 * Static vectors can be initialized with repeating elements,
9148 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9149 * Static structs can be initialized with functional record update,
9150 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9151 * `cfg!` can be used to conditionally execute code based on the crate
9152 configuration, similarly to `#[cfg(...)]`.
9153 * The `unnecessary_qualification` lint detects unneeded module
9154 prefixes (default: allow).
9155 * Arithmetic operations have been implemented on the SIMD types in
9156 `std::unstable::simd`.
9157 * Exchange allocation headers were removed, reducing memory usage.
9158 * `format!` implements a completely new, extensible, and higher-performance
9159 string formatting system. It will replace `fmt!`.
9160 * `print!` and `println!` write formatted strings (using the `format!`
9161 extension) to stdout.
9162 * `write!` and `writeln!` write formatted strings (using the `format!`
9163 extension) to the new Writers in `std::rt::io`.
9164 * The library section in which a function or static is placed may
9165 be specified with `#[link_section = "..."]`.
9166 * The `proto!` syntax extension for defining bounded message protocols
9168 * `macro_rules!` is hygienic for `let` declarations.
9169 * The `#[export_name]` attribute specifies the name of a symbol.
9170 * `unreachable!` can be used to indicate unreachable code, and fails
9174 * std: Transitioned to the new runtime, written in Rust.
9175 * std: Added an experimental I/O library, `rt::io`, based on the new
9177 * std: A new generic `range` function was added to the prelude, replacing
9178 `uint::range` and friends.
9179 * std: `range_rev` no longer exists. Since range is an iterator it can be
9180 reversed with `range(lo, hi).invert()`.
9181 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9182 renamed to `unwrap_or`.
9183 * std: The `iterator` module was renamed to `iter`.
9184 * std: Integral types now support the `checked_add`, `checked_sub`, and
9185 `checked_mul` operations for detecting overflow.
9186 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9188 * std: Methods are standardizing on conventions for casting methods:
9189 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9191 * std: The `CString` type in `c_str` provides new ways to convert to and
9193 * std: `DoubleEndedIterator` can yield elements in two directions.
9194 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9196 * std: `str::from_bytes` renamed to `str::from_utf8`.
9197 * std: `pop_opt` and `shift_opt` methods added to vectors.
9198 * std: The task-local data interface no longer uses @, and keys are
9199 no longer function pointers.
9200 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9201 * std: Added `SharedPort` to `comm`.
9202 * std: `Eq` has a default method for `ne`; only `eq` is required
9204 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9205 is required in implementations.
9206 * std: `is_utf8` performance is improved, impacting many string functions.
9207 * std: `os::MemoryMap` provides cross-platform mmap.
9208 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9209 are not 'in-bounds' are considered undefined.
9210 * std: Many freestanding functions in `vec` removed in favor of methods.
9211 * std: Many freestanding functions on scalar types removed in favor of
9213 * std: Many options to task builders were removed since they don't make
9214 sense in the new scheduler design.
9215 * std: More containers implement `FromIterator` so can be created by the
9217 * std: More complete atomic types in `unstable::atomics`.
9218 * std: `comm::PortSet` removed.
9219 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9220 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9221 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9222 default implementations.
9223 * std: Various `from_str` functions were removed in favor of a generic
9224 `from_str` which is available in the prelude.
9225 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9226 * extra: `dlist`, the doubly-linked list was modernized.
9227 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9228 * extra: Added `glob` module, replacing `std::os::glob`.
9229 * extra: `rope` was removed.
9230 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9231 * extra: `net`, and `timer` were removed. The experimental replacements
9232 are `std::rt::io::net` and `std::rt::io::timer`.
9233 * extra: Iterators implemented for `SmallIntMap`.
9234 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9235 * extra: `SmallIntSet` removed. Use `BitvSet`.
9236 * extra: Performance of JSON parsing greatly improved.
9237 * extra: `semver` updated to SemVer 2.0.0.
9238 * extra: `term` handles more terminals correctly.
9239 * extra: `dbg` module removed.
9240 * extra: `par` module removed.
9241 * extra: `future` was cleaned up, with some method renames.
9242 * extra: Most free functions in `getopts` were converted to methods.
9245 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9246 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9247 similarly to gcc's `--march` flag.
9248 * rustc's performance compiling small crates is much better.
9249 * rustpkg has received many improvements.
9250 * rustpkg supports git tags as package IDs.
9251 * rustpkg builds into target-specific directories so it can be used for
9253 * The number of concurrent test tasks is controlled by the environment
9254 variable RUST_TEST_TASKS.
9255 * The test harness can now report metrics for benchmarks.
9256 * All tools have man pages.
9257 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9258 * The runtime uses jemalloc for allocations.
9259 * Segmented stacks are temporarily disabled as part of the transition to
9260 the new runtime. Stack overflows are possible!
9261 * A new documentation backend, rustdoc_ng, is available for use. It is
9262 still invoked through the normal `rustdoc` command.
9265 Version 0.7 (2013-07-03)
9266 =======================
9268 * ~2000 changes, numerous bugfixes
9271 * `impl`s no longer accept a visibility qualifier. Put them on methods
9273 * The borrow checker has been rewritten with flow-sensitivity, fixing
9274 many bugs and inconveniences.
9275 * The `self` parameter no longer implicitly means `&'self self`,
9276 and can be explicitly marked with a lifetime.
9277 * Overloadable compound operators (`+=`, etc.) have been temporarily
9278 removed due to bugs.
9279 * The `for` loop protocol now requires `for`-iterators to return `bool`
9280 so they compose better.
9281 * The `Durable` trait is replaced with the `'static` bounds.
9282 * Trait default methods work more often.
9283 * Structs with the `#[packed]` attribute have byte alignment and
9284 no padding between fields.
9285 * Type parameters bound by `Copy` must now be copied explicitly with
9287 * It is now illegal to move out of a dereferenced unsafe pointer.
9288 * `Option<~T>` is now represented as a nullable pointer.
9289 * `@mut` does dynamic borrow checks correctly.
9290 * The `main` function is only detected at the topmost level of the crate.
9291 The `#[main]` attribute is still valid anywhere.
9292 * Struct fields may no longer be mutable. Use inherited mutability.
9293 * The `#[no_send]` attribute makes a type that would otherwise be
9295 * The `#[no_freeze]` attribute makes a type that would otherwise be
9297 * Unbounded recursion will abort the process after reaching the limit
9298 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9299 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9300 are never implicitly copyable.
9301 * `#[static_assert]` makes compile-time assertions about static bools.
9302 * At long last, 'argument modes' no longer exist.
9303 * The rarely used `use mod` statement no longer exists.
9306 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9308 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9309 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9311 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9312 and unsuffixed integer literals.
9315 * The `core` crate was renamed to `std`.
9316 * The `std` crate was renamed to `extra`.
9317 * More and improved documentation.
9318 * std: `iterator` module for external iterator objects.
9319 * Many old-style (internal, higher-order function) iterators replaced by
9320 implementations of `Iterator`.
9321 * std: Many old internal vector and string iterators,
9322 incl. `any`, `all`. removed.
9323 * std: The `finalize` method of `Drop` renamed to `drop`.
9324 * std: The `drop` method now takes `&mut self` instead of `&self`.
9325 * std: The prelude no longer re-exports any modules, only types and traits.
9326 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9327 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9328 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9329 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9330 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9331 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9332 * std: Many types implement `Clone`.
9333 * std: `path` type renamed to `Path`.
9334 * std: `mut` module and `Mut` type removed.
9335 * std: Many standalone functions removed in favor of methods and iterators
9336 in `vec`, `str`. In the future methods will also work as functions.
9337 * std: `reinterpret_cast` removed. Use `transmute`.
9338 * std: ascii string handling in `std::ascii`.
9339 * std: `Rand` is implemented for ~/@.
9340 * std: `run` module for spawning processes overhauled.
9341 * std: Various atomic types added to `unstable::atomic`.
9342 * std: Various types implement `Zero`.
9343 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9344 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9345 * std: Added `os::mkdir_recursive`.
9346 * std: Added `os::glob` function performs filesystems globs.
9347 * std: `FuzzyEq` renamed to `ApproxEq`.
9348 * std: `Map` now defines `pop` and `swap` methods.
9349 * std: `Cell` constructors converted to static methods.
9350 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9351 * extra: `flate` module moved from `std` to `extra`.
9352 * extra: `fileinput` module for iterating over a series of files.
9353 * extra: `Complex` number type and `complex` module.
9354 * extra: `Rational` number type and `rational` module.
9355 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9356 * extra: `term` uses terminfo now, is more correct.
9357 * extra: `arc` functions converted to methods.
9358 * extra: Implementation of fixed output size variations of SHA-2.
9361 * `unused_variables` lint mode for unused variables (default: warn).
9362 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9364 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9366 * `dead_assignment` lint mode for unread variables (default: warn).
9367 * `unnecessary_allocation` lint mode detects some heap allocations that are
9368 immediately borrowed so could be written without allocating (default: warn).
9369 * `missing_doc` lint mode (default: allow).
9370 * `unreachable_code` lint mode (default: warn).
9371 * The `rusti` command has been rewritten and a number of bugs addressed.
9372 * rustc outputs in color on more terminals.
9373 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9374 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9375 * Compiling with `-g` will make the binary record information about
9376 dynamic borrowcheck failures for debugging.
9377 * rustdoc has a nicer stylesheet.
9378 * Various improvements to rustdoc.
9379 * Improvements to rustpkg (see the detailed release notes).
9382 Version 0.6 (2013-04-03)
9383 ========================
9385 * ~2100 changes, numerous bugfixes
9388 * The self type parameter in traits is now spelled `Self`
9389 * The `self` parameter in trait and impl methods must now be explicitly
9390 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9391 * Static methods no longer require the `static` keyword and instead
9392 are distinguished by the lack of a `self` parameter
9393 * Replaced the `Durable` trait with the `'static` lifetime
9394 * The old closure type syntax with the trailing sigil has been
9395 removed in favor of the more consistent leading sigil
9396 * `super` is a keyword, and may be prefixed to paths
9397 * Trait bounds are separated with `+` instead of whitespace
9398 * Traits are implemented with `impl Trait for Type`
9399 instead of `impl Type: Trait`
9400 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9401 * The `export` keyword has finally been removed
9402 * The `move` keyword has been removed (see "Semantic changes")
9403 * The interior mutability qualifier on vectors, `[mut T]`, has been
9404 removed. Use `&mut [T]`, etc.
9405 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9406 * `fail` is no longer a keyword. Use `fail!()`
9407 * `assert` is no longer a keyword. Use `assert!()`
9408 * `log` is no longer a keyword. use `debug!`, etc.
9409 * 1-tuples may be represented as `(T,)`
9410 * Struct fields may no longer be `mut`. Use inherited mutability,
9411 `@mut T`, `core::mut` or `core::cell`
9412 * `extern mod { ... }` is no longer valid syntax for foreign
9413 function modules. Use extern blocks: `extern { ... }`
9414 * Newtype enums removed. Use tuple-structs.
9415 * Trait implementations no longer support visibility modifiers
9416 * Pattern matching over vectors improved and expanded
9417 * `const` renamed to `static` to correspond to lifetime name,
9418 and make room for future `static mut` unsafe mutable globals.
9419 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9420 * `Clone` implementations can be automatically generated with
9421 `#[deriving(Clone)]`
9422 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9423 instead of `foo as Bar`.
9424 * Fixed length vector types are now written as `[int, .. 3]`
9425 instead of `[int * 3]`.
9426 * Fixed length vector types can express the length as a constant
9427 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9430 * Types with owned pointers or custom destructors move by default,
9431 eliminating the `move` keyword
9432 * All foreign functions are considered unsafe
9433 * &mut is now unaliasable
9434 * Writes to borrowed @mut pointers are prevented dynamically
9436 * The name of the main function can be customized using #[main]
9437 * The default type of an inferred closure is &fn instead of @fn
9438 * `use` statements may no longer be "chained" - they cannot import
9439 identifiers imported by previous `use` statements
9440 * `use` statements are crate relative, importing from the "top"
9441 of the crate by default. Paths may be prefixed with `super::`
9442 or `self::` to change the search behavior.
9443 * Method visibility is inherited from the implementation declaration
9444 * Structural records have been removed
9445 * Many more types can be used in static items, including enums
9446 'static-lifetime pointers and vectors
9447 * Pattern matching over vectors improved and expanded
9448 * Typechecking of closure types has been overhauled to
9449 improve inference and eliminate unsoundness
9450 * Macros leave scope at the end of modules, unless that module is
9451 tagged with #[macro_escape]
9454 * Added big integers to `std::bigint`
9455 * Removed `core::oldcomm` module
9456 * Added pipe-based `core::comm` module
9457 * Numeric traits have been reorganized under `core::num`
9458 * `vec::slice` finally returns a slice
9459 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9460 * Containers reorganized around traits in `core::container`
9461 * `core::dvec` removed, `~[T]` is a drop-in replacement
9462 * `core::send_map` renamed to `core::hashmap`
9463 * `std::map` removed; replaced with `core::hashmap`
9464 * `std::treemap` reimplemented as an owned balanced tree
9465 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9466 * `core::trie` added as a fast ordered map for integer keys
9467 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9468 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9469 overload the comparison operators, whereas `TotalOrd` is used
9470 by certain container types
9473 * Replaced the 'cargo' package manager with 'rustpkg'
9474 * Added all-purpose 'rust' tool
9475 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9476 * rustc now *attempts* to offer spelling suggestions
9477 * Improved support for ARM and Android
9478 * Preliminary MIPS backend
9479 * Improved foreign function ABI implementation for x86, x86_64
9480 * Various memory usage improvements
9481 * Rust code may be embedded in foreign code under limited circumstances
9482 * Inline assembler supported by new asm!() syntax extension.
9485 Version 0.5 (2012-12-21)
9486 ===========================
9488 * ~900 changes, numerous bugfixes
9491 * Removed `<-` move operator
9492 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9493 * Removed old fixed length vector syntax - `[T]/N`
9494 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9495 * Macros may now expand to items and statements
9496 * `a.b()` is always parsed as a method call, never as a field projection
9497 * `Eq` and `IterBytes` implementations can be automatically generated
9498 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9499 * Removed the special crate language for `.rc` files
9500 * Function arguments may consist of any irrefutable pattern
9503 * `&` and `~` pointers may point to objects
9504 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9505 * Enum variants may be structs
9506 * Destructors can be added to all nominal types with the Drop trait
9507 * Structs and nullary enum variants may be constants
9508 * Values that cannot be implicitly copied are now automatically moved
9509 without writing `move` explicitly
9510 * `&T` may now be coerced to `*T`
9511 * Coercions happen in `let` statements as well as function calls
9512 * `use` statements now take crate-relative paths
9513 * The module and type namespaces have been merged so that static
9514 method names can be resolved under the trait in which they are
9517 * Improved support for language features
9518 * Trait inheritance works in many scenarios
9519 * More support for explicit self arguments in methods - `self`, `&self`
9520 `@self`, and `~self` all generally work as expected
9521 * Static methods work in more situations
9522 * Experimental: Traits may declare default methods for the implementations
9526 * New condition handling system in `core::condition`
9527 * Timsort added to `std::sort`
9528 * New priority queue, `std::priority_queue`
9529 * Pipes for serializable types, `std::flatpipes'
9530 * Serialization overhauled to be trait-based
9531 * Expanded `getopts` definitions
9532 * Moved futures to `std`
9533 * More functions are pure now
9534 * `core::comm` renamed to `oldcomm`. Still deprecated
9535 * `rustdoc` and `cargo` are libraries now
9538 * Added a preliminary REPL, `rusti`
9539 * License changed from MIT to dual MIT/APL2
9542 Version 0.4 (2012-10-15)
9543 ==========================
9545 * ~2000 changes, numerous bugfixes
9548 * All keywords are now strict and may not be used as identifiers anywhere
9549 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9550 'of', 'with', 'to', 'class'.
9551 * Classes are replaced with simpler structs
9552 * Explicit method self types
9553 * `ret` became `return` and `alt` became `match`
9554 * `import` is now `use`; `use is now `extern mod`
9555 * `extern mod { ... }` is now `extern { ... }`
9556 * `use mod` is the recommended way to import modules
9557 * `pub` and `priv` replace deprecated export lists
9558 * The syntax of `match` pattern arms now uses fat arrow (=>)
9559 * `main` no longer accepts an args vector; use `os::args` instead
9562 * Trait implementations are now coherent, ala Haskell typeclasses
9563 * Trait methods may be static
9564 * Argument modes are deprecated
9565 * Borrowed pointers are much more mature and recommended for use
9566 * Strings and vectors in the static region are stored in constant memory
9567 * Typestate was removed
9568 * Resolution rewritten to be more reliable
9569 * Support for 'dual-mode' data structures (freezing and thawing)
9572 * Most binary operators can now be overloaded via the traits in
9574 * `std::net::url` for representing URLs
9575 * Sendable hash maps in `core::send_map`
9576 * `core::task' gained a (currently unsafe) task-local storage API
9579 * An efficient new intertask communication primitive called the pipe,
9580 along with a number of higher-level channel types, in `core::pipes`
9581 * `std::arc`, an atomically reference counted, immutable, shared memory
9583 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9584 * Futures are now based on pipes and sendable
9585 * More robust linked task failure
9586 * Improved task builder API
9589 * Improved error reporting
9590 * Preliminary JIT support
9591 * Preliminary work on precise GC
9592 * Extensive architectural improvements to rustc
9593 * Begun a transition away from buggy C++-based reflection (shape) code to
9594 Rust-based (visitor) code
9595 * All hash functions and tables converted to secure, randomized SipHash
9598 Version 0.3 (2012-07-12)
9599 ========================
9601 * ~1900 changes, numerous bugfixes
9603 * New coding conveniences
9604 * Integer-literal suffix inference
9605 * Per-item control over warnings, errors
9606 * #[cfg(windows)] and #[cfg(unix)] attributes
9607 * Documentation comments
9608 * More compact closure syntax
9609 * 'do' expressions for treating higher-order functions as
9611 * *-patterns (wildcard extended to all constructor fields)
9614 * Name resolution pass and exhaustiveness checker rewritten
9615 * Region pointers and borrow checking supersede alias
9617 * Init-ness checking is now provided by a region-based liveness
9618 pass instead of the typestate pass; same for last-use analysis
9619 * Extensive work on region pointers
9621 * Experimental new language features
9622 * Slices and fixed-size, interior-allocated vectors
9623 * #!-comments for lang versioning, shell execution
9624 * Destructors and iface implementation for classes;
9625 type-parameterized classes and class methods
9626 * 'const' type kind for types that can be used to implement
9627 shared-memory concurrency patterns
9631 * Removal of various obsolete features
9632 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9633 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9635 * Constructs: do-while loops ('do' repurposed), fn binding,
9636 resources (replaced by destructors)
9638 * Compiler reorganization
9639 * Syntax-layer of compiler split into separate crate
9640 * Clang (from LLVM project) integrated into build
9641 * Typechecker split into sub-modules
9644 * New time functions
9645 * Extension methods for many built-in types
9646 * Arc: atomic-refcount read-only / exclusive-use shared cells
9647 * Par: parallel map and search routines
9648 * Extensive work on libuv interface
9649 * Much vector code moved to libraries
9650 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9651 #include, #include_str, #include_bin
9654 * Cargo automatically resolves dependencies
9657 Version 0.2 (2012-03-29)
9658 =========================
9660 * >1500 changes, numerous bugfixes
9662 * New docs and doc tooling
9664 * New port: FreeBSD x86_64
9666 * Compilation model enhancements
9667 * Generics now specialized, multiply instantiated
9668 * Functions now inlined across separate crates
9670 * Scheduling, stack and threading fixes
9671 * Noticeably improved message-passing performance
9672 * Explicit schedulers
9676 * Experimental new language features
9677 * Operator overloading
9681 * Various language extensions
9682 * C-callback function types: 'crust fn ...'
9683 * Infinite-loop construct: 'loop { ... }'
9684 * Shorten 'mutable' to 'mut'
9685 * Required mutable-local qualifier: 'let mut ...'
9686 * Basic glob-exporting: 'export foo::*;'
9687 * Alt now exhaustive, 'alt check' for runtime-checked
9688 * Block-function form of 'for' loop, with 'break' and 'ret'.
9691 * AST quasi-quote syntax extension
9692 * Revived libuv interface
9693 * New modules: core::{future, iter}, std::arena
9694 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9695 * Extensive cleanup, regularization in libstd, libcore
9698 Version 0.1 (2012-01-20)
9699 ===============================
9701 * Most language features work, including:
9702 * Unique pointers, unique closures, move semantics
9703 * Interface-constrained generics
9704 * Static interface dispatch
9706 * Multithread task scheduling
9707 * Typestate predicates
9708 * Failure unwinding, destructors
9709 * Pattern matching and destructuring assignment
9710 * Lightweight block-lambda syntax
9711 * Preliminary macro-by-example
9713 * Compiler works with the following configurations:
9714 * Linux: x86 and x86_64 hosts and targets
9715 * macOS: x86 and x86_64 hosts and targets
9716 * Windows: x86 hosts and targets
9718 * Cross compilation / multi-target configuration supported.
9720 * Preliminary API-documentation and package-management tools included.
9724 * Documentation is incomplete.
9726 * Performance is below intended target.
9728 * Standard library APIs are subject to extensive change, reorganization.
9730 * Language-level versioning is not yet operational - future code will