1 Version 1.28.0 (2018-08-02)
2 ===========================
6 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
7 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
8 the inner type across Foreign Function Interface (FFI) boundaries.
9 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
10 and can now be used as identifiers.][51196]
11 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
12 stable.][51241] This will allow users to specify a global allocator for
14 - [Unit test functions marked with the `#[test]` attribute can now return
15 `Result<(), E: Debug>` in addition to `()`.][51298]
16 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
17 allows macros to easily target lifetimes.
21 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
22 prioritise making smaller binary sizes. `z` is the same as `s` with the
23 exception that it does not vectorise loops, which typically results in an even
25 - [The short error format is now stable.][49546] Specified with
26 `--error-format=short` this option will provide a more compressed output of
28 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
29 - [Reduced the number of allocations in the macro parser.][50855] This can
30 improve compile times of macro heavy crates on average by 5%.
34 - [Implemented `Default` for `&mut str`.][51306]
35 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
36 - [Implemented `Extend` for `()`.][50234]
37 - [The `Debug` implementation of `time::Duration` should now be more easily
38 human readable.][50364] Previously a `Duration` of one second would printed as
39 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
40 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
41 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
42 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
43 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
44 for `PathBuf`.][50170]
45 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
46 and `Wrapping<i128>`.][50465]
47 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
48 possible.][51050] This can provide up to a 40% speed increase.
49 - [Improved error messages when using `format!`.][50610]
53 - [`Iterator::step_by`]
55 - [`SystemTime::UNIX_EPOCH`]
56 - [`alloc::GlobalAlloc`]
58 - [`alloc::LayoutErr`]
61 - [`alloc::alloc_zeroed`]
64 - [`alloc::handle_alloc_error`]
65 - [`btree_map::Entry::or_default`]
67 - [`hash_map::Entry::or_default`]
68 - [`iter::repeat_with`]
69 - [`num::NonZeroUsize`]
70 - [`num::NonZeroU128`]
75 - [`ops::RangeBounds`]
76 - [`slice::SliceIndex`]
79 - [`{Any + Send + Sync}::downcast_mut`]
80 - [`{Any + Send + Sync}::downcast_ref`]
81 - [`{Any + Send + Sync}::is`]
85 - [Cargo will now no longer allow you to publish crates with build scripts that
86 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
87 considered to be immutable.
91 - [The `suggestion_applicability` field in `rustc`'s json output is now
92 stable.][50486] This will allow dev tools to check whether a code suggestion
97 - [Rust will no longer consider trait objects with duplicated constraints to
98 have implementations.][51276] For example the below code will now fail
104 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
107 impl Trait + Send + Send {
108 fn test(&self) { println!("two"); }
112 [49546]: https://github.com/rust-lang/rust/pull/49546/
113 [50143]: https://github.com/rust-lang/rust/pull/50143/
114 [50170]: https://github.com/rust-lang/rust/pull/50170/
115 [50234]: https://github.com/rust-lang/rust/pull/50234/
116 [50265]: https://github.com/rust-lang/rust/pull/50265/
117 [50364]: https://github.com/rust-lang/rust/pull/50364/
118 [50385]: https://github.com/rust-lang/rust/pull/50385/
119 [50465]: https://github.com/rust-lang/rust/pull/50465/
120 [50486]: https://github.com/rust-lang/rust/pull/50486/
121 [50554]: https://github.com/rust-lang/rust/pull/50554/
122 [50610]: https://github.com/rust-lang/rust/pull/50610/
123 [50855]: https://github.com/rust-lang/rust/pull/50855/
124 [51050]: https://github.com/rust-lang/rust/pull/51050/
125 [51196]: https://github.com/rust-lang/rust/pull/51196/
126 [51200]: https://github.com/rust-lang/rust/pull/51200/
127 [51241]: https://github.com/rust-lang/rust/pull/51241/
128 [51276]: https://github.com/rust-lang/rust/pull/51276/
129 [51298]: https://github.com/rust-lang/rust/pull/51298/
130 [51306]: https://github.com/rust-lang/rust/pull/51306/
131 [51562]: https://github.com/rust-lang/rust/pull/51562/
132 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
133 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
134 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
135 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
136 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
137 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
138 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
139 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
140 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
141 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
142 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
143 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
144 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
145 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
146 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
147 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
148 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
149 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
150 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
151 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
152 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
153 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
154 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
155 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
156 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
157 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
158 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
159 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
160 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
161 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
163 Version 1.27.1 (2018-07-10)
164 ===========================
169 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
170 when running, which enabled executing code as some other user on a
171 given machine. This release fixes that vulnerability; you can read
172 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
174 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
179 - The borrow checker was fixed to avoid an additional potential unsoundness when using
180 match ergonomics: [#51415][51415], [#49534][49534].
182 [51415]: https://github.com/rust-lang/rust/issues/51415
183 [49534]: https://github.com/rust-lang/rust/issues/49534
184 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
185 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
187 Version 1.27.0 (2018-06-21)
188 ==========================
192 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
193 be used as an identifer.
194 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
195 bare `Trait` syntax, and should make it clearer when being used in tandem with
196 `impl Trait`. Since it is equivalent to the following syntax:
197 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
198 `Box<Trait> == Box<dyn Trait>`.
199 - [Attributes on generic parameters such as types and lifetimes are
200 now stable.][48851] e.g.
201 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
202 - [The `#[must_use]` attribute can now also be used on functions as well as
203 types.][48925] It provides a lint that by default warns users when the
204 value returned by a function has not been used.
208 - [Added the `armv5te-unknown-linux-musl` target.][50423]
212 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
213 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
214 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
215 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
217 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
218 std are now available in core.][49896]
219 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
221 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
222 that the operation isn't done in place.
223 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
224 the `#[must_use]` attribute][49533] to warn about unused potentially
225 expensive allocations.
229 - [`DoubleEndedIterator::rfind`]
230 - [`DoubleEndedIterator::rfold`]
231 - [`DoubleEndedIterator::try_rfold`]
232 - [`Duration::from_micros`]
233 - [`Duration::from_nanos`]
234 - [`Duration::subsec_micros`]
235 - [`Duration::subsec_millis`]
236 - [`HashMap::remove_entry`]
237 - [`Iterator::try_fold`]
238 - [`Iterator::try_for_each`]
241 - [`String::replace_range`]
242 - [`Take::set_limit`]
243 - [`hint::unreachable_unchecked`]
244 - [`os::unix::process::parent_id`]
245 - [`ptr::swap_nonoverlapping`]
246 - [`slice::rsplit_mut`]
248 - [`slice::swap_with_slice`]
252 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
253 `readme`, and `repository` fields.][cargo/5386]
254 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
255 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
256 a different directory than `target` for placing compilation artifacts.
257 - [Cargo will be adding automatic target inference for binaries, benchmarks,
258 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
259 specific targets e.g. using `[[bin]]` and have other binaries in locations
260 where cargo would infer a binary, Cargo will produce a warning. You can
261 disable this feature ahead of time by setting any of the following `autobins`,
262 `autobenches`, `autoexamples`, `autotests` to false.
263 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
264 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
268 - [Added “The Rustc book” into the official documentation.][49707]
269 [“The Rustc book”] documents and teaches how to use the rustc compiler.
270 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
274 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
275 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
276 compile, `"".is_empty()` will still compile.
277 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
278 will only print the inner type.][48553] e.g.
279 `print!("{:?}", AtomicBool::new(true))` will print `true`
280 not `AtomicBool(true)`.
281 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
282 could enter higher numbers but they were not supported by LLVM. Up to 512MB
283 alignment should cover all use cases.
285 [48553]: https://github.com/rust-lang/rust/pull/48553/
286 [48851]: https://github.com/rust-lang/rust/pull/48851/
287 [48925]: https://github.com/rust-lang/rust/pull/48925/
288 [49533]: https://github.com/rust-lang/rust/pull/49533/
289 [49623]: https://github.com/rust-lang/rust/pull/49623/
290 [49630]: https://github.com/rust-lang/rust/pull/49630/
291 [49664]: https://github.com/rust-lang/rust/pull/49664/
292 [49699]: https://github.com/rust-lang/rust/pull/49699/
293 [49707]: https://github.com/rust-lang/rust/pull/49707/
294 [49719]: https://github.com/rust-lang/rust/pull/49719/
295 [49896]: https://github.com/rust-lang/rust/pull/49896/
296 [49968]: https://github.com/rust-lang/rust/pull/49968/
297 [50177]: https://github.com/rust-lang/rust/pull/50177/
298 [50378]: https://github.com/rust-lang/rust/pull/50378/
299 [50398]: https://github.com/rust-lang/rust/pull/50398/
300 [50423]: https://github.com/rust-lang/rust/pull/50423/
301 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
302 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
303 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
304 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
305 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
306 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
307 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
308 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
309 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
310 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
311 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
312 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
313 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
314 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
315 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
316 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
317 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
318 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
319 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
320 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
321 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
322 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
323 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
324 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
325 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
326 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
327 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
328 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
329 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
330 [“The Rustc book”]: https://doc.rust-lang.org/rustc
333 Version 1.26.2 (2018-06-05)
334 ==========================
339 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics][51117]
341 [51117]: https://github.com/rust-lang/rust/issues/51117
344 Version 1.26.1 (2018-05-29)
345 ==========================
350 - [RLS now works on Windows][50646]
351 - [Rustfmt stopped badly formatting text in some cases][rustfmt/2695]
357 - [`fn main() -> impl Trait` no longer works for non-Termination
359 This reverts an accidental stabilization.
360 - [`NaN > NaN` no longer returns true in const-fn contexts][50812]
361 - [Prohibit using turbofish for `impl Trait` in method arguments][50950]
363 [50646]: https://github.com/rust-lang/rust/issues/50646
364 [50656]: https://github.com/rust-lang/rust/pull/50656
365 [50812]: https://github.com/rust-lang/rust/pull/50812
366 [50950]: https://github.com/rust-lang/rust/issues/50950
367 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
369 Version 1.26.0 (2018-05-10)
370 ==========================
374 - [Closures now implement `Copy` and/or `Clone` if all captured variables
375 implement either or both traits.][49299]
376 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
377 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere where a
378 lifetime can be elided.][49458]
379 - [`impl Trait` is now stable allowing you to have abstract types in returns
380 or in function parameters.][49255] e.g. `fn foo() -> impl Iterator<Item=u8>` or
381 `fn open(path: impl AsRef<Path>)`.
382 - [Pattern matching will now automatically apply dereferences.][49394]
383 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
384 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
385 - [A lot of operations are now available in a const context.][46882] E.g. You
386 can now index into constant arrays, reference and dereference into constants,
387 and use Tuple struct constructors.
388 - [Fixed entry slice patterns are now stable.][48516] e.g.
390 let points = [1, 2, 3, 4];
392 [1, 2, 3, 4] => println!("All points were sequential."),
393 _ => println!("Not all points were sequential."),
400 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
401 - [Fixed exponential projection complexity on nested types.][48296]
402 This can provide up to a ~12% reduction in compile times for certain crates.
403 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
404 to remap path prefixes outputted by the compiler.
405 - [Added `powerpc-unknown-netbsd` target.][48281]
409 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
410 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
411 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
412 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
413 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
414 - [`ascii::escape_default` is now available in libcore.][48735]
415 - [Trailing commas are now supported in std and core macros.][48056]
416 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
417 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
422 - [`*const T::copy_to_nonoverlapping`]
423 - [`*const T::copy_to`]
424 - [`*const T::read_unaligned`]
425 - [`*const T::read_volatile`]
428 - [`*const T::wrapping_add`]
429 - [`*const T::wrapping_sub`]
431 - [`*mut T::copy_to_nonoverlapping`]
432 - [`*mut T::copy_to`]
433 - [`*mut T::read_unaligned`]
434 - [`*mut T::read_volatile`]
436 - [`*mut T::replace`]
439 - [`*mut T::wrapping_add`]
440 - [`*mut T::wrapping_sub`]
441 - [`*mut T::write_bytes`]
442 - [`*mut T::write_unaligned`]
443 - [`*mut T::write_volatile`]
446 - [`FromUtf8Error::as_bytes`]
447 - [`LocalKey::try_with`]
449 - [`btree_map::Entry::and_modify`]
450 - [`fs::read_to_string`]
453 - [`hash_map::Entry::and_modify`]
454 - [`iter::FusedIterator`]
455 - [`ops::RangeInclusive`]
456 - [`ops::RangeToInclusive`]
458 - [`slice::rotate_left`]
459 - [`slice::rotate_right`]
465 - [Cargo will now output path to custom commands when `-v` is
466 passed with `--list`][cargo/5041]
467 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
471 - [The second edition of "The Rust Programming Language" book is now recommended
472 over the first.][48404]
477 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
478 syntax is now invalid.
480 use std::ops::Fn as dyn;
481 fn g(_: Box<dyn(std::fmt::Debug)>) {}
483 - [The result of dereferences are no longer promoted to `'static`.][47408]
487 const PAIR: &(i32, i32) = &(0, 1);
488 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
491 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
492 - [`".e0"` will now no longer parse as `0.0` and will instead cause
494 - [Removed hoedown from rustdoc.][48274]
495 - [Bounds on higher-kinded lifetimes a hard error.][48326]
497 [46882]: https://github.com/rust-lang/rust/pull/46882
498 [47379]: https://github.com/rust-lang/rust/pull/47379
499 [47408]: https://github.com/rust-lang/rust/pull/47408
500 [47813]: https://github.com/rust-lang/rust/pull/47813
501 [48056]: https://github.com/rust-lang/rust/pull/48056
502 [48125]: https://github.com/rust-lang/rust/pull/48125
503 [48166]: https://github.com/rust-lang/rust/pull/48166
504 [48235]: https://github.com/rust-lang/rust/pull/48235
505 [48274]: https://github.com/rust-lang/rust/pull/48274
506 [48281]: https://github.com/rust-lang/rust/pull/48281
507 [48296]: https://github.com/rust-lang/rust/pull/48296
508 [48326]: https://github.com/rust-lang/rust/pull/48326
509 [48359]: https://github.com/rust-lang/rust/pull/48359
510 [48404]: https://github.com/rust-lang/rust/pull/48404
511 [48481]: https://github.com/rust-lang/rust/pull/48481
512 [48516]: https://github.com/rust-lang/rust/pull/48516
513 [48628]: https://github.com/rust-lang/rust/pull/48628
514 [48629]: https://github.com/rust-lang/rust/pull/48629
515 [48657]: https://github.com/rust-lang/rust/pull/48657
516 [48735]: https://github.com/rust-lang/rust/pull/48735
517 [48978]: https://github.com/rust-lang/rust/pull/48978
518 [49101]: https://github.com/rust-lang/rust/pull/49101
519 [49109]: https://github.com/rust-lang/rust/pull/49109
520 [49121]: https://github.com/rust-lang/rust/pull/49121
521 [49162]: https://github.com/rust-lang/rust/pull/49162
522 [49184]: https://github.com/rust-lang/rust/pull/49184
523 [49234]: https://github.com/rust-lang/rust/pull/49234
524 [49255]: https://github.com/rust-lang/rust/pull/49255
525 [49299]: https://github.com/rust-lang/rust/pull/49299
526 [49305]: https://github.com/rust-lang/rust/pull/49305
527 [49394]: https://github.com/rust-lang/rust/pull/49394
528 [49458]: https://github.com/rust-lang/rust/pull/49458
529 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
530 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
531 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
532 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
533 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
534 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
535 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
536 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
537 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
538 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
539 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
540 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
541 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
542 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
543 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
544 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
545 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
546 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
547 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
548 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
549 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
550 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
551 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
552 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
553 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
554 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
555 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
556 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
557 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
558 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
559 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
560 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
561 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
562 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
563 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
564 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
565 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
566 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
567 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
568 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
569 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
570 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
573 Version 1.25.0 (2018-03-29)
574 ==========================
578 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
579 - [You can now use nested groups of imports.][47948]
580 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
581 - [You can now have `|` at the start of a match arm.][47947] e.g.
589 | Foo::B => println!("AB"),
590 | Foo::C => println!("C"),
597 - [Upgraded to LLVM 6.][47828]
598 - [Added `-C lto=val` option.][47521]
599 - [Added `i586-unknown-linux-musl` target][47282]
603 - [Impl Send for `process::Command` on Unix.][47760]
604 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
605 - [`UnsafeCell::into_inner` is now safe.][47204]
606 - [Implement libstd for CloudABI.][47268]
607 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
608 - [Implement `AsRef<Path>` for Component][46985]
609 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
610 - [Moved `Duration` to libcore.][46666]
614 - [`Location::column`]
617 The following functions can now be used in a constant expression.
618 eg. `static MINUTE: Duration = Duration::from_secs(60);`
619 - [`Duration::new`][47300]
620 - [`Duration::from_secs`][47300]
621 - [`Duration::from_millis`][47300]
625 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
626 - [`cargo new` now defaults to creating a binary crate, instead of a
627 library crate.][cargo/5029]
631 - [Rust by example is now shipped with new releases][46196]
635 - [Deprecated `net::lookup_host`.][47510]
636 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
637 - The borrow checker was sometimes incorrectly permitting overlapping borrows
638 around indexing operations (see [#47349][47349]). This has been fixed (which also
639 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
640 - [Removed deprecated unstable attribute `#[simd]`.][47251]
642 [33903]: https://github.com/rust-lang/rust/pull/33903
643 [47947]: https://github.com/rust-lang/rust/pull/47947
644 [47948]: https://github.com/rust-lang/rust/pull/47948
645 [47760]: https://github.com/rust-lang/rust/pull/47760
646 [47790]: https://github.com/rust-lang/rust/pull/47790
647 [47828]: https://github.com/rust-lang/rust/pull/47828
648 [47398]: https://github.com/rust-lang/rust/pull/47398
649 [47510]: https://github.com/rust-lang/rust/pull/47510
650 [47521]: https://github.com/rust-lang/rust/pull/47521
651 [47204]: https://github.com/rust-lang/rust/pull/47204
652 [47251]: https://github.com/rust-lang/rust/pull/47251
653 [47268]: https://github.com/rust-lang/rust/pull/47268
654 [47282]: https://github.com/rust-lang/rust/pull/47282
655 [47300]: https://github.com/rust-lang/rust/pull/47300
656 [47349]: https://github.com/rust-lang/rust/pull/47349
657 [46931]: https://github.com/rust-lang/rust/pull/46931
658 [46985]: https://github.com/rust-lang/rust/pull/46985
659 [47006]: https://github.com/rust-lang/rust/pull/47006
660 [46830]: https://github.com/rust-lang/rust/pull/46830
661 [46095]: https://github.com/rust-lang/rust/pull/46095
662 [46666]: https://github.com/rust-lang/rust/pull/46666
663 [46196]: https://github.com/rust-lang/rust/pull/46196
664 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
665 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
666 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
667 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
668 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
671 Version 1.24.1 (2018-03-01)
672 ==========================
674 - [Do not abort when unwinding through FFI][48251]
675 - [Emit UTF-16 files for linker arguments on Windows][48318]
676 - [Make the error index generator work again][48308]
677 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
679 [48251]: https://github.com/rust-lang/rust/issues/48251
680 [48308]: https://github.com/rust-lang/rust/issues/48308
681 [48318]: https://github.com/rust-lang/rust/issues/48318
682 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
685 Version 1.24.0 (2018-02-15)
686 ==========================
690 - [External `sysv64` ffi is now available.][46528]
691 eg. `extern "sysv64" fn foo () {}`
695 - [rustc now uses 16 codegen units by default for release builds.][46910]
696 For the fastest builds, utilize `codegen-units=1`.
697 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
698 - [Add `aarch64-unknown-openbsd` support][46760]
702 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
703 improvement in performance in the majority of cases.
704 - [`OsStr`'s `Debug` implementation is now lossless and consistent
705 with Windows.][46798]
706 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
707 - [impl `From<bool>` for `AtomicBool`][46293]
708 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
709 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
710 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
711 - [float::from_bits now just uses transmute.][46012] This provides
712 some optimisations from LLVM.
713 - [Copied `AsciiExt` methods onto `char`][46077]
714 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
715 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
716 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
717 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
721 - [`RefCell::replace`]
723 - [`atomic::spin_loop_hint`]
725 The following functions can now be used in a constant expression.
726 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
728 - [`AtomicBool::new`][46287]
729 - [`AtomicUsize::new`][46287]
730 - [`AtomicIsize::new`][46287]
731 - [`AtomicPtr::new`][46287]
732 - [`Cell::new`][46287]
733 - [`{integer}::min_value`][46287]
734 - [`{integer}::max_value`][46287]
735 - [`mem::size_of`][46287]
736 - [`mem::align_of`][46287]
737 - [`ptr::null`][46287]
738 - [`ptr::null_mut`][46287]
739 - [`RefCell::new`][46287]
740 - [`UnsafeCell::new`][46287]
744 - [Added a `workspace.default-members` config that
745 overrides implied `--all` in virtual workspaces.][cargo/4743]
746 - [Enable incremental by default on development builds.][cargo/4817] Also added
747 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
748 per-project or global basis respectively.
755 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
756 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
757 in accordance with IETF RFC 4291 §2.2.
758 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
759 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
760 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
761 - [Leading zeros in tuple struct members is now an error][47084]
762 - [`column!()` macro is one-based instead of zero-based][46977]
763 - [`fmt::Arguments` can no longer be shared across threads][45198]
764 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
765 - [Cargo sets a different working directory for the compiler][cargo/4788]
767 [44884]: https://github.com/rust-lang/rust/pull/44884
768 [45198]: https://github.com/rust-lang/rust/pull/45198
769 [45506]: https://github.com/rust-lang/rust/pull/45506
770 [45904]: https://github.com/rust-lang/rust/pull/45904
771 [45990]: https://github.com/rust-lang/rust/pull/45990
772 [46012]: https://github.com/rust-lang/rust/pull/46012
773 [46077]: https://github.com/rust-lang/rust/pull/46077
774 [46094]: https://github.com/rust-lang/rust/pull/46094
775 [46284]: https://github.com/rust-lang/rust/pull/46284
776 [46287]: https://github.com/rust-lang/rust/pull/46287
777 [46293]: https://github.com/rust-lang/rust/pull/46293
778 [46528]: https://github.com/rust-lang/rust/pull/46528
779 [46671]: https://github.com/rust-lang/rust/pull/46671
780 [46713]: https://github.com/rust-lang/rust/pull/46713
781 [46735]: https://github.com/rust-lang/rust/pull/46735
782 [46749]: https://github.com/rust-lang/rust/pull/46749
783 [46760]: https://github.com/rust-lang/rust/pull/46760
784 [46798]: https://github.com/rust-lang/rust/pull/46798
785 [46828]: https://github.com/rust-lang/rust/pull/46828
786 [46831]: https://github.com/rust-lang/rust/pull/46831
787 [46833]: https://github.com/rust-lang/rust/pull/46833
788 [46910]: https://github.com/rust-lang/rust/pull/46910
789 [46977]: https://github.com/rust-lang/rust/pull/46977
790 [47018]: https://github.com/rust-lang/rust/pull/47018
791 [47080]: https://github.com/rust-lang/rust/pull/47080
792 [47084]: https://github.com/rust-lang/rust/pull/47084
793 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
794 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
795 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
796 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
797 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
798 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
801 Version 1.23.0 (2018-01-04)
802 ==========================
806 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
807 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
808 Which should fix some confusing errors in some operations.
812 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
813 undefined behaviour.][45920]
814 - [rustc now suggests renaming import if names clash.][45660]
815 - [Display errors/warnings correctly when there are zero-width or
816 wide characters.][45711]
817 - [rustc now avoids unnecessary copies of arguments that are
818 simple bindings][45380] This should improve memory usage on average by 5-10%.
819 - [Updated musl used to build musl rustc to 1.1.17][45393]
823 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
824 - [Implement Hash for raw pointers to unsized types][45483]
825 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
826 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
827 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
828 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
829 and `<*mut T>::as_mut`][44932]
830 - [Optimized `Thread::{park, unpark}` implementation][45524]
831 - [Improved `SliceExt::binary_search` performance.][45333]
832 - [impl `FromIterator<()>` for `()`][45379]
833 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
841 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
842 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
843 - [Added unit test checking to `cargo check`][cargo/4592]
844 - [Cargo now lets you install a specific version
845 using `cargo install --version`][cargo/4637]
849 - [Releases now ship with the Cargo book documentation.][45692]
850 - [rustdoc now prints rendering warnings on every run.][45324]
854 - [Changes have been made to type equality to make it more correct,
855 in rare cases this could break some code.][45853] [Tracking issue for
856 further information][45852]
857 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
858 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
859 Android 9, the minimum supported version is Android 14.
860 - [Bumped the minimum LLVM to 3.9][45326]
862 [44042]: https://github.com/rust-lang/rust/pull/44042
863 [44932]: https://github.com/rust-lang/rust/pull/44932
864 [45267]: https://github.com/rust-lang/rust/pull/45267
865 [45324]: https://github.com/rust-lang/rust/pull/45324
866 [45326]: https://github.com/rust-lang/rust/pull/45326
867 [45333]: https://github.com/rust-lang/rust/pull/45333
868 [45379]: https://github.com/rust-lang/rust/pull/45379
869 [45380]: https://github.com/rust-lang/rust/pull/45380
870 [45393]: https://github.com/rust-lang/rust/pull/45393
871 [45435]: https://github.com/rust-lang/rust/pull/45435
872 [45483]: https://github.com/rust-lang/rust/pull/45483
873 [45524]: https://github.com/rust-lang/rust/pull/45524
874 [45571]: https://github.com/rust-lang/rust/pull/45571
875 [45580]: https://github.com/rust-lang/rust/pull/45580
876 [45610]: https://github.com/rust-lang/rust/pull/45610
877 [45660]: https://github.com/rust-lang/rust/pull/45660
878 [45692]: https://github.com/rust-lang/rust/pull/45692
879 [45711]: https://github.com/rust-lang/rust/pull/45711
880 [45772]: https://github.com/rust-lang/rust/pull/45772
881 [45852]: https://github.com/rust-lang/rust/issues/45852
882 [45853]: https://github.com/rust-lang/rust/pull/45853
883 [45887]: https://github.com/rust-lang/rust/pull/45887
884 [45920]: https://github.com/rust-lang/rust/pull/45920
885 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
886 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
887 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
890 Version 1.22.1 (2017-11-22)
891 ==========================
893 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
895 [46183]: https://github.com/rust-lang/rust/pull/46183
897 Version 1.22.0 (2017-11-22)
898 ==========================
902 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
903 - [Now accepts underscores in unicode escapes][43716]
904 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
905 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
909 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
910 - [rustc will no longer inline in codegen units when compiling for debug][45075]
911 This should decrease compile times for debug builds.
912 - [strict memory alignment now enabled on ARMv6][45094]
913 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
917 - [Allow atomic operations up to 32 bits
918 on `armv5te_unknown_linux_gnueabi`][44978]
919 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
920 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
921 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
922 - [Properly detect overflow in `Instant += Duration`.][44220]
923 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
924 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
925 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
932 - [Cargo will now build multi file examples in subdirectories of the `examples`
933 folder that have a `main.rs` file.][cargo/4496]
934 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
935 the old format will continue to work and can be updated with `cargo update`.
936 - [Now supports vendoring git repositories][cargo/3992]
940 - [`libbacktrace` is now available on Apple platforms.][44251]
941 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
942 This now lets you specify that a given code example will fail to compile.
946 - [The minimum Android version that rustc can build for has been bumped
947 to `4.0` from `2.3`][45656]
948 - [Allowing `T op= &T` for numeric types has broken some type
949 inference cases][45480]
952 [42526]: https://github.com/rust-lang/rust/pull/42526
953 [43017]: https://github.com/rust-lang/rust/pull/43017
954 [43716]: https://github.com/rust-lang/rust/pull/43716
955 [43949]: https://github.com/rust-lang/rust/pull/43949
956 [44015]: https://github.com/rust-lang/rust/pull/44015
957 [44220]: https://github.com/rust-lang/rust/pull/44220
958 [44251]: https://github.com/rust-lang/rust/pull/44251
959 [44287]: https://github.com/rust-lang/rust/pull/44287
960 [44303]: https://github.com/rust-lang/rust/pull/44303
961 [44456]: https://github.com/rust-lang/rust/pull/44456
962 [44466]: https://github.com/rust-lang/rust/pull/44466
963 [44895]: https://github.com/rust-lang/rust/pull/44895
964 [44966]: https://github.com/rust-lang/rust/pull/44966
965 [44978]: https://github.com/rust-lang/rust/pull/44978
966 [45041]: https://github.com/rust-lang/rust/pull/45041
967 [45064]: https://github.com/rust-lang/rust/pull/45064
968 [45075]: https://github.com/rust-lang/rust/pull/45075
969 [45094]: https://github.com/rust-lang/rust/pull/45094
970 [45095]: https://github.com/rust-lang/rust/pull/45095
971 [45480]: https://github.com/rust-lang/rust/issues/45480
972 [45656]: https://github.com/rust-lang/rust/pull/45656
973 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
974 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
975 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
982 Version 1.21.0 (2017-10-12)
983 ==========================
987 - [You can now use static references for literals.][43838]
991 let x: &'static u32 = &0;
994 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
997 my_macro!(Vec<i32>::new); // Always worked
998 my_macro!(Vec::<i32>::new); // Now works
1003 - [Upgraded jemalloc to 4.5.0][43911]
1004 - [Enabled unwinding panics on Redox][43917]
1005 - [Now runs LLVM in parallel during translation phase.][43506]
1006 This should reduce peak memory usage.
1010 - [Generate builtin impls for `Clone` for all arrays and tuples that
1011 are `T: Clone`][43690]
1012 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1013 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1014 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1019 [`std::mem::discriminant`]
1023 - [You can now call `cargo install` with multiple package names][cargo/4216]
1024 - [Cargo commands inside a virtual workspace will now implicitly
1025 pass `--all`][cargo/4335]
1026 - [Added a `[patch]` section to `Cargo.toml` to handle
1027 prepublication dependencies][cargo/4123] [RFC 1969]
1028 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1029 like patterns][cargo/4270]
1030 - [Added the `--all-targets` option][cargo/4400]
1031 - [Using required dependencies as a feature is now deprecated and emits
1032 a warning][cargo/4364]
1037 - [Cargo docs are moving][43916]
1038 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1039 - [The rustdoc book is now available][43863]
1040 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1041 - [Added a preview of RLS has been made available through rustup][44204]
1042 Install with `rustup component add rls-preview`
1043 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1044 Previously only showed `std::os::unix`.
1048 - [Changes in method matching against higher-ranked types][43880] This may cause
1049 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1050 - [rustc's JSON error output's byte position start at top of file.][42973]
1051 Was previously relative to the rustc's internal `CodeMap` struct which
1052 required the unstable library `libsyntax` to correctly use.
1053 - [`unused_results` lint no longer ignores booleans][43728]
1055 [42565]: https://github.com/rust-lang/rust/pull/42565
1056 [42973]: https://github.com/rust-lang/rust/pull/42973
1057 [43348]: https://github.com/rust-lang/rust/pull/43348
1058 [43459]: https://github.com/rust-lang/rust/pull/43459
1059 [43506]: https://github.com/rust-lang/rust/pull/43506
1060 [43540]: https://github.com/rust-lang/rust/pull/43540
1061 [43690]: https://github.com/rust-lang/rust/pull/43690
1062 [43728]: https://github.com/rust-lang/rust/pull/43728
1063 [43838]: https://github.com/rust-lang/rust/pull/43838
1064 [43863]: https://github.com/rust-lang/rust/pull/43863
1065 [43880]: https://github.com/rust-lang/rust/pull/43880
1066 [43911]: https://github.com/rust-lang/rust/pull/43911
1067 [43916]: https://github.com/rust-lang/rust/pull/43916
1068 [43917]: https://github.com/rust-lang/rust/pull/43917
1069 [44204]: https://github.com/rust-lang/rust/pull/44204
1070 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1071 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1072 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1073 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1074 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1075 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1076 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1077 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1078 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1080 Version 1.20.0 (2017-08-31)
1081 ===========================
1085 - [Associated constants are now stabilised.][42809]
1086 - [A lot of macro bugs are now fixed.][42913]
1091 - [Struct fields are now properly coerced to the expected field type.][42807]
1092 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1093 `wasm32-experimental-emscripten` target.
1094 - [Changed some of the error messages to be more helpful.][42033]
1095 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1097 - [rustc now reports the total number of errors on compilation failure][43015]
1098 previously this was only the number of errors in the pass that failed.
1099 - [Expansion in rustc has been sped up 29x.][42533]
1100 - [added `msp430-none-elf` target.][43099]
1101 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1103 - [Fixes backtraces on Redox][43228]
1104 - [rustc now identifies different versions of same crate when absolute paths of
1105 different types match in an error message.][42826]
1111 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1112 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1114 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1115 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1116 - [Impl `Clone` for `DefaultHasher`.][42799]
1117 - [Impl `Sync` for `SyncSender`.][42397]
1118 - [Impl `FromStr` for `char`][42271]
1119 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1121 - [allow messages in the `unimplemented!()` macro.][42155]
1122 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1123 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1124 - [Upgrade to Unicode 10.0.0][42999]
1125 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1126 - [Skip the main thread's manual stack guard on Linux][43072]
1127 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1128 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1130 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1135 - [`CStr::into_c_string`]
1136 - [`CString::as_c_str`]
1137 - [`CString::into_boxed_c_str`]
1138 - [`Chain::get_mut`]
1139 - [`Chain::get_ref`]
1140 - [`Chain::into_inner`]
1141 - [`Option::get_or_insert_with`]
1142 - [`Option::get_or_insert`]
1143 - [`OsStr::into_os_string`]
1144 - [`OsString::into_boxed_os_str`]
1147 - [`Utf8Error::error_len`]
1148 - [`char::EscapeDebug`]
1149 - [`char::escape_debug`]
1150 - [`compile_error!`]
1151 - [`f32::from_bits`]
1153 - [`f64::from_bits`]
1155 - [`mem::ManuallyDrop`]
1156 - [`slice::sort_unstable_by_key`]
1157 - [`slice::sort_unstable_by`]
1158 - [`slice::sort_unstable`]
1159 - [`str::from_boxed_utf8_unchecked`]
1160 - [`str::as_bytes_mut`]
1161 - [`str::as_bytes_mut`]
1162 - [`str::from_utf8_mut`]
1163 - [`str::from_utf8_unchecked_mut`]
1165 - [`str::get_unchecked_mut`]
1166 - [`str::get_unchecked`]
1168 - [`str::into_boxed_bytes`]
1173 - [Cargo API token location moved from `~/.cargo/config` to
1174 `~/.cargo/credentials`.][cargo/3978]
1175 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1176 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1177 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1178 - [You can now specify version of a binary when installed through
1179 `cargo install` using `--vers`.][cargo/4229]
1180 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1181 failure.][cargo/4248]
1182 - [Changed the convention around which file is the crate root.][cargo/4259]
1183 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1184 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1189 - [Functions with `'static` in their return types will now not be as usable as
1190 if they were using lifetime parameters instead.][42417]
1191 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1192 takes the sign of NaN into account where previously didn't.][42430]
1194 [42033]: https://github.com/rust-lang/rust/pull/42033
1195 [42155]: https://github.com/rust-lang/rust/pull/42155
1196 [42271]: https://github.com/rust-lang/rust/pull/42271
1197 [42397]: https://github.com/rust-lang/rust/pull/42397
1198 [42417]: https://github.com/rust-lang/rust/pull/42417
1199 [42430]: https://github.com/rust-lang/rust/pull/42430
1200 [42431]: https://github.com/rust-lang/rust/pull/42431
1201 [42533]: https://github.com/rust-lang/rust/pull/42533
1202 [42571]: https://github.com/rust-lang/rust/pull/42571
1203 [42613]: https://github.com/rust-lang/rust/pull/42613
1204 [42799]: https://github.com/rust-lang/rust/pull/42799
1205 [42807]: https://github.com/rust-lang/rust/pull/42807
1206 [42809]: https://github.com/rust-lang/rust/pull/42809
1207 [42822]: https://github.com/rust-lang/rust/pull/42822
1208 [42826]: https://github.com/rust-lang/rust/pull/42826
1209 [42854]: https://github.com/rust-lang/rust/pull/42854
1210 [42913]: https://github.com/rust-lang/rust/pull/42913
1211 [42999]: https://github.com/rust-lang/rust/pull/42999
1212 [43011]: https://github.com/rust-lang/rust/pull/43011
1213 [43015]: https://github.com/rust-lang/rust/pull/43015
1214 [43072]: https://github.com/rust-lang/rust/pull/43072
1215 [43077]: https://github.com/rust-lang/rust/pull/43077
1216 [43097]: https://github.com/rust-lang/rust/pull/43097
1217 [43099]: https://github.com/rust-lang/rust/pull/43099
1218 [43170]: https://github.com/rust-lang/rust/pull/43170
1219 [43178]: https://github.com/rust-lang/rust/pull/43178
1220 [43185]: https://github.com/rust-lang/rust/pull/43185
1221 [43228]: https://github.com/rust-lang/rust/pull/43228
1222 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1223 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1224 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1225 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1226 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1227 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1228 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1229 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1230 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1231 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1232 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1233 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1234 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1235 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1236 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1237 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1238 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1239 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1240 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1241 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1242 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1243 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1244 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1245 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1246 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1247 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1248 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1249 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1250 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1251 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1252 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1253 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1254 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1255 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1256 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1257 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1258 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1259 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1260 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1263 Version 1.19.0 (2017-07-20)
1264 ===========================
1269 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1270 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1271 - [Macro recursion limit increased to 1024 from 64.][41676]
1272 - [Added lint for detecting unused macros.][41907]
1273 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1274 For example: `let x = loop { break 7; };`
1275 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1276 contain `Copy` types and cannot have a `Drop` implementation.
1277 Example: `union Foo { bar: u8, baz: usize }`
1278 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1279 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1284 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1285 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1286 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1287 you should use `--target armv7-linux-androideabi`.
1288 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1289 - [Minor optimisation of string operations.][42037]
1290 - [Compiler error message is now `aborting due to previous error(s)` instead of
1291 `aborting due to N previous errors`][42150] This was previously inaccurate and
1292 would only count certain kinds of errors.
1293 - [The compiler now supports Visual Studio 2017][42225]
1294 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1295 - [Added a lot][42264] of [new error codes][42302]
1296 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1297 libraries with C Run-time Libraries(CRT) to be statically linked.
1298 - [Fixed various ARM codegen bugs][42740]
1303 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1304 `Extend<Cow<'a, str>>`][41449]
1305 - [`Vec` now implements `From<&mut [T]>`][41530]
1306 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1307 - [`SplitWhitespace` now implements `Clone`][41659]
1308 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1310 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1311 macros, but for printing to stderr.
1316 - [`OsString::shrink_to_fit`]
1319 - [`thread::ThreadId`]
1324 - [Build scripts can now add environment variables to the environment
1325 the crate is being compiled in.
1326 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1327 - [Subcommands now replace the current process rather than spawning a new
1328 child process][cargo/3970]
1329 - [Workspace members can now accept glob file patterns][cargo/3979]
1330 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1331 the members in a given workspace.][cargo/3988]
1332 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1333 - [Target directory path is now in the cargo metadata][cargo/4022]
1334 - [Cargo no longer checks out a local working directory for the
1335 crates.io index][cargo/4026] This should provide smaller file size for the
1336 registry, and improve cloning times, especially on Windows machines.
1337 - [Added an `--exclude` option for excluding certain packages when using the
1338 `--all` option][cargo/4031]
1339 - [Cargo will now automatically retry when receiving a 5xx error
1340 from crates.io][cargo/4032]
1341 - [The `--features` option now accepts multiple comma or space
1342 delimited values.][cargo/4084]
1343 - [Added support for custom target specific runners][cargo/3954]
1348 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1350 - [Rust will now release XZ compressed packages][rust-installer/57]
1351 - [rustup will now prefer to download rust packages with
1352 XZ compression][rustup/1100] over GZip packages.
1353 - [Added the ability to escape `#` in rust documentation][41785] By adding
1354 additional `#`'s ie. `##` is now `#`
1359 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1360 - [`-Z` flags are now no longer allowed to be used on the stable
1361 compiler.][41751] This has been a warning for a year previous to this.
1362 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1363 longer works][42844]. Users should migrate to the built-in `check`
1364 command, which has been available since 1.16.
1365 - [Ending a float literal with `._` is now a hard error.
1366 Example: `42._` .][41946]
1367 - [Any use of a private `extern crate` outside of its module is now a
1368 hard error.][36886] This was previously a warning.
1369 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1370 relative while the `::` prefix makes a path absolute, but was ignored and the
1371 path was relative regardless.
1372 - [Floating point constants in match patterns is now a hard error][36890]
1373 This was previously a warning.
1374 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1375 match patterns is now a hard error][36891] This was previously a warning.
1376 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1378 - [From the pound escape, lines consisting of multiple `#`s are
1380 - [It is an error to re-export private enum variants][42460]. This is
1381 known to break a number of crates that depend on an older version of
1383 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1384 to use it to find the linker, and the build will fail where it did
1385 not previously][42607]
1387 [36886]: https://github.com/rust-lang/rust/issues/36886
1388 [36888]: https://github.com/rust-lang/rust/issues/36888
1389 [36890]: https://github.com/rust-lang/rust/issues/36890
1390 [36891]: https://github.com/rust-lang/rust/issues/36891
1391 [36892]: https://github.com/rust-lang/rust/issues/36892
1392 [37406]: https://github.com/rust-lang/rust/issues/37406
1393 [39983]: https://github.com/rust-lang/rust/pull/39983
1394 [41145]: https://github.com/rust-lang/rust/pull/41145
1395 [41192]: https://github.com/rust-lang/rust/pull/41192
1396 [41258]: https://github.com/rust-lang/rust/pull/41258
1397 [41370]: https://github.com/rust-lang/rust/pull/41370
1398 [41449]: https://github.com/rust-lang/rust/pull/41449
1399 [41530]: https://github.com/rust-lang/rust/pull/41530
1400 [41624]: https://github.com/rust-lang/rust/pull/41624
1401 [41656]: https://github.com/rust-lang/rust/pull/41656
1402 [41659]: https://github.com/rust-lang/rust/pull/41659
1403 [41676]: https://github.com/rust-lang/rust/pull/41676
1404 [41751]: https://github.com/rust-lang/rust/pull/41751
1405 [41764]: https://github.com/rust-lang/rust/pull/41764
1406 [41785]: https://github.com/rust-lang/rust/pull/41785
1407 [41873]: https://github.com/rust-lang/rust/pull/41873
1408 [41907]: https://github.com/rust-lang/rust/pull/41907
1409 [41946]: https://github.com/rust-lang/rust/pull/41946
1410 [42016]: https://github.com/rust-lang/rust/pull/42016
1411 [42037]: https://github.com/rust-lang/rust/pull/42037
1412 [42068]: https://github.com/rust-lang/rust/pull/42068
1413 [42150]: https://github.com/rust-lang/rust/pull/42150
1414 [42162]: https://github.com/rust-lang/rust/pull/42162
1415 [42225]: https://github.com/rust-lang/rust/pull/42225
1416 [42264]: https://github.com/rust-lang/rust/pull/42264
1417 [42302]: https://github.com/rust-lang/rust/pull/42302
1418 [42460]: https://github.com/rust-lang/rust/issues/42460
1419 [42607]: https://github.com/rust-lang/rust/issues/42607
1420 [42740]: https://github.com/rust-lang/rust/pull/42740
1421 [42844]: https://github.com/rust-lang/rust/issues/42844
1422 [42948]: https://github.com/rust-lang/rust/pull/42948
1423 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
1424 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
1425 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
1426 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
1427 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
1428 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
1429 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
1430 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
1431 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
1432 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
1433 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
1434 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
1435 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
1436 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
1437 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
1438 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
1439 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
1440 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
1441 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
1442 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
1443 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
1444 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
1447 Version 1.18.0 (2017-06-08)
1448 ===========================
1453 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
1454 make the item visible to just that module tree. Also accepts the keyword
1455 `crate` to make something public to the whole crate but not users of the
1456 library. Example: `pub(crate) mod utils;`. [RFC 1422].
1457 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
1458 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
1459 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
1460 types like `Write + Send`, trailing `+` are now supported in trait objects,
1461 and better error reporting for trait objects starting with `?Sized`.
1462 - [0e+10 is now a valid floating point literal][40589]
1463 - [Now warns if you bind a lifetime parameter to 'static][40734]
1464 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
1465 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
1466 representation in some cases.][40377]
1471 - [rustc can now emit mir with `--emit mir`][39891]
1472 - [Improved LLVM IR for trivial functions][40367]
1473 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
1474 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
1475 opportunities found through profiling
1476 - [Improved backtrace formatting when panicking][38165]
1481 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
1482 iterator hasn't been advanced the original `Vec` is reassembled with no actual
1483 iteration or reallocation.
1484 - [Simplified HashMap Bucket interface][40561] provides performance
1485 improvements for iterating and cloning.
1486 - [Specialize Vec::from_elem to use calloc][40409]
1487 - [Fixed Race condition in fs::create_dir_all][39799]
1488 - [No longer caching stdio on Windows][40516]
1489 - [Optimized insertion sort in slice][40807] insertion sort in some cases
1490 2.50%~ faster and in one case now 12.50% faster.
1491 - [Optimized `AtomicBool::fetch_nand`][41143]
1496 - [`Child::try_wait`]
1497 - [`HashMap::retain`]
1498 - [`HashSet::retain`]
1500 - [`TcpStream::peek`]
1501 - [`UdpSocket::peek`]
1502 - [`UdpSocket::peek_from`]
1507 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
1508 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
1509 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
1510 - [Added Android build support][cargo/3885]
1511 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
1512 of a certain type, for example `cargo build --bins` will build all
1514 - [Added support for haiku][cargo/3952]
1519 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
1520 - [Added rust-windbg script for better debugging on Windows][39983]
1521 - [Rust now uses the official cross compiler for NetBSD][40612]
1522 - [rustdoc now accepts `#` at the start of files][40828]
1523 - [Fixed jemalloc support for musl][41168]
1528 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
1529 always placed after the sign if it exists and before the digits. With the `#`
1530 flag the zeroes are placed after the prefix and before the digits.
1531 - [Due to the struct field optimisation][40377], using `transmute` on structs
1532 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
1533 always been undefined behavior, but is now more likely to break in practice.
1534 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
1535 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
1536 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
1537 - [Overlapping inherent `impl`s are now a hard error][40728]
1538 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
1539 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
1540 `out.asm` and `out.ll` instead of only one of the filetypes.
1541 - [ calling a function that returns `Self` will no longer work][41805] when
1542 the size of `Self` cannot be statically determined.
1543 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
1544 this has caused a few regressions namely:
1546 - Changed the link order of local static/dynamic libraries (respecting the
1547 order on given rather than having the compiler reorder).
1548 - Changed how MinGW is linked, native code linked to dynamic libraries
1549 may require manually linking to the gcc support library (for the native
1552 [38165]: https://github.com/rust-lang/rust/pull/38165
1553 [39799]: https://github.com/rust-lang/rust/pull/39799
1554 [39891]: https://github.com/rust-lang/rust/pull/39891
1555 [39983]: https://github.com/rust-lang/rust/pull/39983
1556 [40043]: https://github.com/rust-lang/rust/pull/40043
1557 [40241]: https://github.com/rust-lang/rust/pull/40241
1558 [40338]: https://github.com/rust-lang/rust/pull/40338
1559 [40367]: https://github.com/rust-lang/rust/pull/40367
1560 [40377]: https://github.com/rust-lang/rust/pull/40377
1561 [40409]: https://github.com/rust-lang/rust/pull/40409
1562 [40516]: https://github.com/rust-lang/rust/pull/40516
1563 [40556]: https://github.com/rust-lang/rust/pull/40556
1564 [40561]: https://github.com/rust-lang/rust/pull/40561
1565 [40589]: https://github.com/rust-lang/rust/pull/40589
1566 [40612]: https://github.com/rust-lang/rust/pull/40612
1567 [40723]: https://github.com/rust-lang/rust/pull/40723
1568 [40728]: https://github.com/rust-lang/rust/pull/40728
1569 [40731]: https://github.com/rust-lang/rust/pull/40731
1570 [40734]: https://github.com/rust-lang/rust/pull/40734
1571 [40805]: https://github.com/rust-lang/rust/pull/40805
1572 [40807]: https://github.com/rust-lang/rust/pull/40807
1573 [40828]: https://github.com/rust-lang/rust/pull/40828
1574 [40870]: https://github.com/rust-lang/rust/pull/40870
1575 [41085]: https://github.com/rust-lang/rust/pull/41085
1576 [41143]: https://github.com/rust-lang/rust/pull/41143
1577 [41168]: https://github.com/rust-lang/rust/pull/41168
1578 [41270]: https://github.com/rust-lang/rust/issues/41270
1579 [41469]: https://github.com/rust-lang/rust/pull/41469
1580 [41805]: https://github.com/rust-lang/rust/issues/41805
1581 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1582 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1583 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1584 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1585 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1586 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1587 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1588 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1589 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1590 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1591 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1592 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1593 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1594 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1597 Version 1.17.0 (2017-04-27)
1598 ===========================
1603 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1604 * [Fields of structs may be initialized without duplicating the field/variable
1605 names][39761]. [RFC 1682]
1606 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1607 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1608 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1609 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1610 `'b`. Soundness fix.
1611 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1612 * [Static variables may contain references to other statics][40027]
1617 * [Exit quickly on only `--emit dep-info`][40336]
1618 * [Make `-C relocation-model` more correctly determine whether the linker
1619 creates a position-independent executable][40245]
1620 * [Add `-C overflow-checks` to directly control whether integer overflow
1622 * [The rustc type checker now checks items on demand instead of in a single
1623 in-order pass][40008]. This is mostly an internal refactoring in support of
1624 future work, including incremental type checking, but also resolves [RFC
1625 1647], allowing `Self` to appear in `impl` `where` clauses.
1626 * [Optimize vtable loads][39995]
1627 * [Turn off vectorization for Emscripten targets][39990]
1628 * [Provide suggestions for unknown macros imported with `use`][39953]
1629 * [Fix ICEs in path resolution][39939]
1630 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1631 * [Add clearer error message using `&str + &str`][39116]
1642 * [`Ordering::then`]
1643 * [`Ordering::then_with`]
1644 * [`BTreeMap::range`]
1645 * [`BTreeMap::range_mut`]
1646 * [`collections::Bound`]
1647 * [`process::abort`]
1648 * [`ptr::read_unaligned`]
1649 * [`ptr::write_unaligned`]
1650 * [`Result::expect_err`]
1653 * [`Cell::into_inner`]
1659 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1660 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1661 * [`String` implements `FromIterator<&char>`][40028]
1662 * `Box` [implements][40009] a number of new conversions:
1663 `From<Box<str>> for String`,
1664 `From<Box<[T]>> for Vec<T>`,
1665 `From<Box<CStr>> for CString`,
1666 `From<Box<OsStr>> for OsString`,
1667 `From<Box<Path>> for PathBuf`,
1668 `Into<Box<str>> for String`,
1669 `Into<Box<[T]>> for Vec<T>`,
1670 `Into<Box<CStr>> for CString`,
1671 `Into<Box<OsStr>> for OsString`,
1672 `Into<Box<Path>> for PathBuf`,
1673 `Default for Box<str>`,
1674 `Default for Box<CStr>`,
1675 `Default for Box<OsStr>`,
1676 `From<&CStr> for Box<CStr>`,
1677 `From<&OsStr> for Box<OsStr>`,
1678 `From<&Path> for Box<Path>`
1679 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1680 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1681 * [Slightly optimize `slice::sort`][39538]
1682 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1683 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1684 `Box<str>` implements `From<&str>`][39438]
1685 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1686 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1687 * [`format!` estimates the needed capacity before writing a string][39356]
1688 * [Support unprivileged symlink creation in Windows][38921]
1689 * [`PathBuf` implements `Default`][38764]
1690 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1691 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1692 and poor hash functions.
1697 * [Add `cargo check --all`][cargo/3731]
1698 * [Add an option to ignore SSL revocation checking][cargo/3699]
1699 * [Add `cargo run --package`][cargo/3691]
1700 * [Add `required_features`][cargo/3667]
1701 * [Assume `build.rs` is a build script][cargo/3664]
1702 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1707 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1709 * [The "Unstable Book" documents nightly-only features][ubook]
1710 * [Improve the style of the sidebar in rustdoc output][40265]
1711 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1712 * [Fix MSP430 breakage due to `i128`][40257]
1713 * [Preliminary Solaris/SPARCv9 support][39903]
1714 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1715 run without installing the MSVC runtime.
1716 * [`rustdoc --test` includes file names in test names][39788]
1717 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1718 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1719 * [Initial support for `aarch64-unknown-freebsd`][39491]
1720 * [Initial support for `i686-unknown-netbsd`][39426]
1721 * [This release no longer includes the old makefile build system][39431]. Rust
1722 is built with a custom build system, written in Rust, and with Cargo.
1723 * [Add Debug implementations for libcollection structs][39002]
1724 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1725 * [`--test-threads=0` produces an error][38945]
1726 * [`rustup` installs documentation by default][40526]
1727 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1728 WinDbg and Visual Studio to improve the debugging experience.
1733 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1734 workaround, either use MSVC 2015 or run vcvars.bat.
1735 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1736 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1737 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1739 * [`format!` and `Display::to_string` panic if an underlying formatting
1740 implementation returns an error][40117]. Previously the error was silently
1741 ignored. It is incorrect for `write_fmt` to return an error when writing
1743 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1744 crates were marked stable and could be accessed from the stable toolchain.
1745 * [Rust git source no longer includes vendored crates][39728]. Those that need
1746 to build with vendored crates should build from release tarballs.
1747 * [Fix inert attributes from `proc_macro_derives`][39572]
1748 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1749 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1751 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1752 existing code generally ignores the type of dead-code unless a type-hint is
1753 provided; this can cause surprising inference interactions particularly around
1754 defaulting. The new code uniformly ignores the result type of dead-code.
1755 * [Tuple-struct constructors with private fields are no longer visible][38932]
1756 * [Lifetime parameters that do not appear in the arguments are now considered
1757 early-bound][38897], resolving a soundness bug (#[32330]). The
1758 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1760 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1761 * [Make transmuting from fn item types to pointer-sized types a hard
1764 [27787]: https://github.com/rust-lang/rust/issues/27787
1765 [32330]: https://github.com/rust-lang/rust/issues/32330
1766 [34198]: https://github.com/rust-lang/rust/pull/34198
1767 [38161]: https://github.com/rust-lang/rust/pull/38161
1768 [38368]: https://github.com/rust-lang/rust/pull/38368
1769 [38584]: https://github.com/rust-lang/rust/issues/38584
1770 [38661]: https://github.com/rust-lang/rust/pull/38661
1771 [38764]: https://github.com/rust-lang/rust/pull/38764
1772 [38864]: https://github.com/rust-lang/rust/issues/38864
1773 [38897]: https://github.com/rust-lang/rust/pull/38897
1774 [38921]: https://github.com/rust-lang/rust/pull/38921
1775 [38932]: https://github.com/rust-lang/rust/pull/38932
1776 [38945]: https://github.com/rust-lang/rust/pull/38945
1777 [38981]: https://github.com/rust-lang/rust/pull/38981
1778 [39002]: https://github.com/rust-lang/rust/pull/39002
1779 [39116]: https://github.com/rust-lang/rust/pull/39116
1780 [39193]: https://github.com/rust-lang/rust/pull/39193
1781 [39265]: https://github.com/rust-lang/rust/pull/39265
1782 [39356]: https://github.com/rust-lang/rust/pull/39356
1783 [39372]: https://github.com/rust-lang/rust/pull/39372
1784 [39426]: https://github.com/rust-lang/rust/pull/39426
1785 [39431]: https://github.com/rust-lang/rust/pull/39431
1786 [39438]: https://github.com/rust-lang/rust/pull/39438
1787 [39440]: https://github.com/rust-lang/rust/pull/39440
1788 [39485]: https://github.com/rust-lang/rust/pull/39485
1789 [39491]: https://github.com/rust-lang/rust/pull/39491
1790 [39518]: https://github.com/rust-lang/rust/pull/39518
1791 [39538]: https://github.com/rust-lang/rust/pull/39538
1792 [39572]: https://github.com/rust-lang/rust/pull/39572
1793 [39633]: https://github.com/rust-lang/rust/pull/39633
1794 [39642]: https://github.com/rust-lang/rust/pull/39642
1795 [39728]: https://github.com/rust-lang/rust/pull/39728
1796 [39761]: https://github.com/rust-lang/rust/pull/39761
1797 [39788]: https://github.com/rust-lang/rust/pull/39788
1798 [39793]: https://github.com/rust-lang/rust/pull/39793
1799 [39837]: https://github.com/rust-lang/rust/pull/39837
1800 [39843]: https://github.com/rust-lang/rust/pull/39843
1801 [39851]: https://github.com/rust-lang/rust/pull/39851
1802 [39903]: https://github.com/rust-lang/rust/pull/39903
1803 [39939]: https://github.com/rust-lang/rust/pull/39939
1804 [39953]: https://github.com/rust-lang/rust/pull/39953
1805 [39960]: https://github.com/rust-lang/rust/pull/39960
1806 [39990]: https://github.com/rust-lang/rust/pull/39990
1807 [39995]: https://github.com/rust-lang/rust/pull/39995
1808 [40008]: https://github.com/rust-lang/rust/pull/40008
1809 [40009]: https://github.com/rust-lang/rust/pull/40009
1810 [40027]: https://github.com/rust-lang/rust/pull/40027
1811 [40028]: https://github.com/rust-lang/rust/pull/40028
1812 [40037]: https://github.com/rust-lang/rust/pull/40037
1813 [40117]: https://github.com/rust-lang/rust/pull/40117
1814 [40166]: https://github.com/rust-lang/rust/pull/40166
1815 [40245]: https://github.com/rust-lang/rust/pull/40245
1816 [40257]: https://github.com/rust-lang/rust/pull/40257
1817 [40261]: https://github.com/rust-lang/rust/pull/40261
1818 [40265]: https://github.com/rust-lang/rust/pull/40265
1819 [40319]: https://github.com/rust-lang/rust/pull/40319
1820 [40336]: https://github.com/rust-lang/rust/pull/40336
1821 [40526]: https://github.com/rust-lang/rust/pull/40526
1822 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1823 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1824 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1825 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1826 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1827 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1828 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1829 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1830 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1831 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1832 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1833 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1834 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1835 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1836 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1837 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1838 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1839 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1840 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1841 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1842 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1843 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1844 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1845 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1846 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1847 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1848 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1849 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1850 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1851 [mdbook]: https://crates.io/crates/mdbook
1852 [ubook]: https://doc.rust-lang.org/unstable-book/
1855 Version 1.16.0 (2017-03-16)
1856 ===========================
1861 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1862 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1863 match patterns][38069]
1864 * [Clean up semantics of `self` in an import list][38313]
1865 * [`Self` may appear in `impl` headers][38920]
1866 * [`Self` may appear in struct expressions][39282]
1871 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1872 a `.rmeta` file containing only crate metadata][38571]. This can be
1873 used by tools like the Rust Language Service to perform
1874 metadata-only builds.
1875 * [Levenshtein based typo suggestions now work in most places, while
1876 previously they worked only for fields and sometimes for local
1877 variables][38927]. Together with the overhaul of "no
1878 resolution"/"unexpected resolution" errors (#[38154]) they result in
1879 large and systematic improvement in resolution diagnostics.
1880 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1882 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1883 * [`rustc` no longer attempts to provide "consider using an explicit
1884 lifetime" suggestions][37057]. They were inaccurate.
1889 * [`VecDeque::truncate`]
1890 * [`VecDeque::resize`]
1891 * [`String::insert_str`]
1892 * [`Duration::checked_add`]
1893 * [`Duration::checked_sub`]
1894 * [`Duration::checked_div`]
1895 * [`Duration::checked_mul`]
1898 * [`SocketAddr::is_ipv4`]
1899 * [`SocketAddr::is_ipv6`]
1900 * [`IpAddr::is_ipv4`]
1901 * [`IpAddr::is_ipv6`]
1903 * [`Vec::dedup_by_key`]
1904 * [`Result::unwrap_or_default`]
1905 * [`<*const T>::wrapping_offset`]
1906 * [`<*mut T>::wrapping_offset`]
1907 * `CommandExt::creation_flags`
1908 * [`File::set_permissions`]
1909 * [`String::split_off`]
1914 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1915 their argument by `Borrow` parameter][37761]
1916 * [All public types in std implement `Debug`][38006]
1917 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1918 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1919 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1921 * [std: Fix partial writes in `LineWriter`][38062]
1922 * [std: Clamp max read/write sizes on Unix][38062]
1923 * [Use more specific panic message for `&str` slicing errors][38066]
1924 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1925 functionality cannot be achieved in std currently.
1926 * [`writeln!`, like `println!`, now accepts a form with no string
1927 or formatting arguments, to just print a newline][38469]
1928 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1929 * [Reduce the size of static data in `std_unicode::tables`][38781]
1930 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1931 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1933 * [`Duration` implements `Sum`][38712]
1934 * [`String` implements `ToSocketAddrs`][39048]
1939 * [The `cargo check` command does a type check of a project without
1940 building it][cargo/3296]
1941 * [crates.io will display CI badges from Travis and AppVeyor, if
1942 specified in Cargo.toml][cargo/3546]
1943 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1944 * [Compilation profiles accept integer values for `debug`, in addition
1945 to `true` and `false`. These are passed to `rustc` as the value to
1946 `-C debuginfo`][cargo/3534]
1947 * [Implement `cargo --version --verbose`][cargo/3604]
1948 * [All builds now output 'dep-info' build dependencies compatible with
1949 make and ninja][cargo/3557]
1950 * [Build all workspace members with `build --all`][cargo/3511]
1951 * [Document all workspace members with `doc --all`][cargo/3515]
1952 * [Path deps outside workspace are not members][cargo/3443]
1957 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1958 the path to the Rust implementation][38589]
1959 * [The `armv7-linux-androideabi` target no longer enables NEON
1960 extensions, per Google's ABI guide][38413]
1961 * [The stock standard library can be compiled for Redox OS][38401]
1962 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1964 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1966 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1971 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1972 match patterns][38069]
1973 * In this release, references to uninhabited types can not be
1974 pattern-matched. This was accidentally allowed in 1.15.
1975 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1976 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1978 * [Clean up semantics of `self` in an import list][38313]
1979 * Reimplemented lifetime elision. This change was almost entirely compatible
1980 with existing code, but it did close a number of small bugs and loopholes,
1981 as well as being more accepting in some other [cases][41105].
1983 [37057]: https://github.com/rust-lang/rust/pull/37057
1984 [37761]: https://github.com/rust-lang/rust/pull/37761
1985 [38006]: https://github.com/rust-lang/rust/pull/38006
1986 [38051]: https://github.com/rust-lang/rust/pull/38051
1987 [38062]: https://github.com/rust-lang/rust/pull/38062
1988 [38062]: https://github.com/rust-lang/rust/pull/38622
1989 [38066]: https://github.com/rust-lang/rust/pull/38066
1990 [38069]: https://github.com/rust-lang/rust/pull/38069
1991 [38131]: https://github.com/rust-lang/rust/pull/38131
1992 [38154]: https://github.com/rust-lang/rust/pull/38154
1993 [38274]: https://github.com/rust-lang/rust/pull/38274
1994 [38304]: https://github.com/rust-lang/rust/pull/38304
1995 [38313]: https://github.com/rust-lang/rust/pull/38313
1996 [38314]: https://github.com/rust-lang/rust/pull/38314
1997 [38327]: https://github.com/rust-lang/rust/pull/38327
1998 [38401]: https://github.com/rust-lang/rust/pull/38401
1999 [38413]: https://github.com/rust-lang/rust/pull/38413
2000 [38469]: https://github.com/rust-lang/rust/pull/38469
2001 [38559]: https://github.com/rust-lang/rust/pull/38559
2002 [38571]: https://github.com/rust-lang/rust/pull/38571
2003 [38580]: https://github.com/rust-lang/rust/pull/38580
2004 [38589]: https://github.com/rust-lang/rust/pull/38589
2005 [38670]: https://github.com/rust-lang/rust/pull/38670
2006 [38712]: https://github.com/rust-lang/rust/pull/38712
2007 [38726]: https://github.com/rust-lang/rust/pull/38726
2008 [38781]: https://github.com/rust-lang/rust/pull/38781
2009 [38798]: https://github.com/rust-lang/rust/pull/38798
2010 [38909]: https://github.com/rust-lang/rust/pull/38909
2011 [38920]: https://github.com/rust-lang/rust/pull/38920
2012 [38927]: https://github.com/rust-lang/rust/pull/38927
2013 [39048]: https://github.com/rust-lang/rust/pull/39048
2014 [39282]: https://github.com/rust-lang/rust/pull/39282
2015 [39379]: https://github.com/rust-lang/rust/pull/39379
2016 [41105]: https://github.com/rust-lang/rust/issues/41105
2017 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2018 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2019 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2020 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2021 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2022 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2023 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2024 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2025 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2026 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2027 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2028 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2029 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2030 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2031 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2032 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2033 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2034 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2035 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2036 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2037 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2038 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2039 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2040 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2041 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2042 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2043 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2044 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2045 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2046 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2049 Version 1.15.1 (2017-02-09)
2050 ===========================
2052 * [Fix IntoIter::as_mut_slice's signature][39466]
2053 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2055 [39466]: https://github.com/rust-lang/rust/pull/39466
2056 [39523]: https://github.com/rust-lang/rust/pull/39523
2059 Version 1.15.0 (2017-02-02)
2060 ===========================
2065 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2066 stable. This allows popular code-generating crates like Serde and Diesel to
2067 work ergonomically. [RFC 1681].
2068 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2069 with curly braces][36868]. Part of [RFC 1506].
2070 * [A number of minor changes to name resolution have been activated][37127].
2071 They add up to more consistent semantics, allowing for future evolution of
2072 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2073 details of what is different. The breaking changes here have been transitioned
2074 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2075 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2077 * [`?Sized` can be used in `where` clauses][37791]
2078 * [There is now a limit on the size of monomorphized types and it can be
2079 modified with the `#![type_size_limit]` crate attribute, similarly to
2080 the `#![recursion_limit]` attribute][37789]
2085 * [On Windows, the compiler will apply dllimport attributes when linking to
2086 extern functions][37973]. Additional attributes and flags can control which
2087 library kind is linked and its name. [RFC 1717].
2088 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2089 * [The `--test` flag works with procedural macro crates][38107]
2090 * [Fix `extern "aapcs" fn` ABI][37814]
2091 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2092 * [The `format!` expander recognizes incorrect `printf` and shell-style
2093 formatting directives and suggests the correct format][37613].
2094 * [Only report one error for all unused imports in an import list][37456]
2096 Compiler Performance
2097 --------------------
2099 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2100 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2101 * [Don't clone in `UnificationTable::probe`][37848]
2102 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2103 * [Use small vectors in type walker][37760]
2104 * [Macro expansion performance was improved][37701]
2105 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2106 * [Replace FNV with a faster hash function][37229]
2111 * [`std::iter::Iterator::min_by`]
2112 * [`std::iter::Iterator::max_by`]
2113 * [`std::os::*::fs::FileExt`]
2114 * [`std::sync::atomic::Atomic*::get_mut`]
2115 * [`std::sync::atomic::Atomic*::into_inner`]
2116 * [`std::vec::IntoIter::as_slice`]
2117 * [`std::vec::IntoIter::as_mut_slice`]
2118 * [`std::sync::mpsc::Receiver::try_iter`]
2119 * [`std::os::unix::process::CommandExt::before_exec`]
2120 * [`std::rc::Rc::strong_count`]
2121 * [`std::rc::Rc::weak_count`]
2122 * [`std::sync::Arc::strong_count`]
2123 * [`std::sync::Arc::weak_count`]
2124 * [`std::char::encode_utf8`]
2125 * [`std::char::encode_utf16`]
2126 * [`std::cell::Ref::clone`]
2127 * [`std::io::Take::into_inner`]
2132 * [The standard sorting algorithm has been rewritten for dramatic performance
2133 improvements][38192]. It is a hybrid merge sort, drawing influences from
2134 Timsort. Previously it was a naive merge sort.
2135 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2136 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2138 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2139 and `char_indices().last()`][37882]
2140 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2141 * [Chinese characters display correctly in `fmt::Debug`][37855]
2142 * [Derive `Default` for `Duration`][37699]
2143 * [Support creation of anonymous pipes on WinXP/2k][37677]
2144 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2145 * [Don't pass overlapped handles to processes][38835]
2150 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2151 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2152 should instead check the variable at runtime with `std::env`. That the value
2153 was set at build time was a bug, and incorrect when cross-compiling. This
2154 change is known to cause breakage.
2155 * [Add `--all` flag to `cargo test`][cargo/3221]
2156 * [Compile statically against the MSVC CRT][cargo/3363]
2157 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2158 * [Link OpenSSL statically on OSX][cargo/3311]
2159 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2160 * [Test for bad path overrides with summaries][cargo/3336]
2161 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2162 * [Fix retrying crate downloads for network errors][cargo/3348]
2163 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2164 * [Emit more info on --message-format=json][cargo/3319]
2165 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2166 * [Don't ignore errors in workspace manifest][cargo/3409]
2167 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2172 * [Test runners (binaries built with `--test`) now support a `--list` argument
2173 that lists the tests it contains][38185]
2174 * [Test runners now support a `--exact` argument that makes the test filter
2175 match exactly, instead of matching only a substring of the test name][38181]
2176 * [rustdoc supports a `--playground-url` flag][37763]
2177 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2182 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2183 continue to be used in this release by passing `--disable-rustbuild` to the
2184 configure script, but they will be deleted soon. Note that the new build
2185 system uses a different on-disk layout that will likely affect any scripts
2187 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2189 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2190 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2196 * [A number of minor changes to name resolution have been activated][37127].
2197 They add up to more consistent semantics, allowing for future evolution of
2198 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2199 details of what is different. The breaking changes here have been transitioned
2200 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2201 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2202 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2203 should instead check the variable at runtime with `std::env`. That the value
2204 was set at build time was a bug, and incorrect when cross-compiling. This
2205 change is known to cause breakage.
2206 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2207 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2208 1.10 and is now an error by default. It will become a hard error in the near
2210 * [The semantics relating modules to file system directories are changing in
2211 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2212 lint, which is a warning in this release, and will become a hard error in the
2214 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2215 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2216 the underlying iterator][37834]
2218 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2219 [33685]: https://github.com/rust-lang/rust/issues/33685
2220 [36868]: https://github.com/rust-lang/rust/pull/36868
2221 [37127]: https://github.com/rust-lang/rust/pull/37127
2222 [37229]: https://github.com/rust-lang/rust/pull/37229
2223 [37456]: https://github.com/rust-lang/rust/pull/37456
2224 [37527]: https://github.com/rust-lang/rust/pull/37527
2225 [37602]: https://github.com/rust-lang/rust/pull/37602
2226 [37613]: https://github.com/rust-lang/rust/pull/37613
2227 [37615]: https://github.com/rust-lang/rust/pull/37615
2228 [37636]: https://github.com/rust-lang/rust/pull/37636
2229 [37627]: https://github.com/rust-lang/rust/pull/37627
2230 [37642]: https://github.com/rust-lang/rust/pull/37642
2231 [37677]: https://github.com/rust-lang/rust/pull/37677
2232 [37699]: https://github.com/rust-lang/rust/pull/37699
2233 [37701]: https://github.com/rust-lang/rust/pull/37701
2234 [37705]: https://github.com/rust-lang/rust/pull/37705
2235 [37749]: https://github.com/rust-lang/rust/pull/37749
2236 [37760]: https://github.com/rust-lang/rust/pull/37760
2237 [37763]: https://github.com/rust-lang/rust/pull/37763
2238 [37764]: https://github.com/rust-lang/rust/pull/37764
2239 [37789]: https://github.com/rust-lang/rust/pull/37789
2240 [37791]: https://github.com/rust-lang/rust/pull/37791
2241 [37814]: https://github.com/rust-lang/rust/pull/37814
2242 [37817]: https://github.com/rust-lang/rust/pull/37817
2243 [37834]: https://github.com/rust-lang/rust/pull/37834
2244 [37848]: https://github.com/rust-lang/rust/pull/37848
2245 [37855]: https://github.com/rust-lang/rust/pull/37855
2246 [37882]: https://github.com/rust-lang/rust/pull/37882
2247 [37888]: https://github.com/rust-lang/rust/pull/37888
2248 [37973]: https://github.com/rust-lang/rust/pull/37973
2249 [37979]: https://github.com/rust-lang/rust/pull/37979
2250 [38086]: https://github.com/rust-lang/rust/pull/38086
2251 [38107]: https://github.com/rust-lang/rust/pull/38107
2252 [38117]: https://github.com/rust-lang/rust/pull/38117
2253 [38134]: https://github.com/rust-lang/rust/pull/38134
2254 [38146]: https://github.com/rust-lang/rust/pull/38146
2255 [38181]: https://github.com/rust-lang/rust/pull/38181
2256 [38182]: https://github.com/rust-lang/rust/pull/38182
2257 [38185]: https://github.com/rust-lang/rust/pull/38185
2258 [38192]: https://github.com/rust-lang/rust/pull/38192
2259 [38279]: https://github.com/rust-lang/rust/pull/38279
2260 [38835]: https://github.com/rust-lang/rust/pull/38835
2261 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2262 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2263 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2264 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2265 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2266 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2267 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2268 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2269 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2270 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2271 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2272 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2273 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2274 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2275 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2276 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2277 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2278 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2279 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2280 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2281 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2282 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2283 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2284 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2285 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2286 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2287 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2288 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2289 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2290 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2291 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2292 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2293 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2294 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2295 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2296 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2297 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2298 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2301 Version 1.14.0 (2016-12-22)
2302 ===========================
2307 * [`..` matches multiple tuple fields in enum variants, structs
2308 and tuples][36843]. [RFC 1492].
2309 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2310 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2311 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2312 dereferencing][36822]
2317 * [Mark enums with non-zero discriminant as non-zero][37224]
2318 * [Lower-case `static mut` names are linted like other
2319 statics and consts][37162]
2320 * [Fix ICE on some macros in const integer positions
2321 (e.g. `[u8; m!()]`)][36819]
2322 * [Improve error message and snippet for "did you mean `x`"][36798]
2323 * [Add a panic-strategy field to the target specification][36794]
2324 * [Include LLVM version in `--version --verbose`][37200]
2326 Compile-time Optimizations
2327 --------------------------
2329 * [Improve macro expansion performance][37569]
2330 * [Shrink `Expr_::ExprInlineAsm`][37445]
2331 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2332 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2333 * [Avoid more allocations when compiling html5ever][37373]
2334 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2335 * [Avoid some allocations in the macro parser][37318]
2336 * [Use a faster deflate setting][37298]
2337 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2338 during interning of slices][37270]
2339 * [Optimize `write_metadata`][37267]
2340 * [Don't process obligation forest cycles when stalled][37231]
2341 * [Avoid many `CrateConfig` clones][37161]
2342 * [Optimize `Substs::super_fold_with`][37108]
2343 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2344 * [Speed up `plug_leaks`][36917]
2349 * [`println!()`, with no arguments, prints newline][36825].
2350 Previously, an empty string was required to achieve the same.
2351 * [`Wrapping` impls standard binary and unary operators, as well as
2352 the `Sum` and `Product` iterators][37356]
2353 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2355 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2356 `VecDeque` iterators][37315]
2357 * [Improve `SipHasher` performance on small values][37312]
2358 * [Add Iterator trait TrustedLen to enable better FromIterator /
2360 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2361 * [`ReadDir` implements `Debug`][37221]
2362 * [Implement `RefUnwindSafe` for atomic types][37178]
2363 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2364 * [Avoid allocations in `Decoder::read_str`][37064]
2365 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2366 * [Impl `Debug` for raw pointers to unsized data][36880]
2367 * [Don't reuse `HashMap` random seeds][37470]
2368 * [The internal memory layout of `HashMap` is more cache-friendly, for
2369 significant improvements in some operations][36692]
2370 * [`HashMap` uses less memory on 32-bit architectures][36595]
2371 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2376 * [Expose rustc cfg values to build scripts][cargo/3243]
2377 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2378 * [Fix passing --features when testing multiple packages][cargo/3280]
2379 * [Use a single profile set per workspace][cargo/3249]
2380 * [Load `replace` sections from lock files][cargo/3220]
2381 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2386 * [rustup is the recommended Rust installation method][1.14rustup]
2387 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2388 S390x. These are [tier 2] platforms and may have major defects. Follow the
2389 instructions on the website to install, or add the targets to an existing
2390 installation with `rustup target add`. The new target triples are:
2391 - `mips-unknown-linux-gnu`
2392 - `mipsel-unknown-linux-gnu`
2393 - `mips64-unknown-linux-gnuabi64`
2394 - `mips64el-unknown-linux-gnuabi64 `
2395 - `powerpc-unknown-linux-gnu`
2396 - `powerpc64-unknown-linux-gnu`
2397 - `powerpc64le-unknown-linux-gnu`
2398 - `s390x-unknown-linux-gnu `
2399 * This release includes target (std) builds for ARM Linux running MUSL
2400 libc. These are [tier 2] platforms and may have major defects. Add the
2401 following triples to an existing rustup installation with `rustup target add`:
2402 - `arm-unknown-linux-musleabi`
2403 - `arm-unknown-linux-musleabihf`
2404 - `armv7-unknown-linux-musleabihf`
2405 * This release includes [experimental support for WebAssembly][1.14wasm], via
2406 the `wasm32-unknown-emscripten` target. This target is known to have major
2407 defects. Please test, report, and fix.
2408 * rustup no longer installs documentation by default. Run `rustup
2409 component add rust-docs` to install.
2410 * [Fix line stepping in debugger][37310]
2411 * [Enable line number debuginfo in releases][37280]
2416 * [Disable jemalloc on aarch64/powerpc/mips][37392]
2417 * [Add support for Fuchsia OS][37313]
2418 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
2423 * [A number of forward-compatibility lints used by the compiler
2424 to gradually introduce language changes have been converted
2425 to deny by default][36894]:
2426 - ["use of inaccessible extern crate erroneously allowed"][36886]
2427 - ["type parameter default erroneously allowed in invalid location"][36887]
2428 - ["detects super or self keywords at the beginning of global path"][36888]
2429 - ["two overlapping inherent impls define an item with the same name
2430 were erroneously allowed"][36889]
2431 - ["floating-point constants cannot be used in patterns"][36890]
2432 - ["constants of struct or enum type can only be used in a pattern if
2433 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
2434 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
2435 * [Prohibit patterns in trait methods without bodies][37378]
2436 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
2437 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
2438 * [The `$crate` macro variable is accepted in fewer locations][37213]
2439 * [Impls specifying extra region requirements beyond the trait
2440 they implement are rejected][37167]
2441 * [Enums may not be unsized][37111]. Unsized enums are intended to
2442 work but never have. For now they are forbidden.
2443 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
2445 [tier 2]: https://forge.rust-lang.org/platform-support.html
2446 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
2447 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
2448 [36430]: https://github.com/rust-lang/rust/pull/36430
2449 [36595]: https://github.com/rust-lang/rust/pull/36595
2450 [36595]: https://github.com/rust-lang/rust/pull/36595
2451 [36692]: https://github.com/rust-lang/rust/pull/36692
2452 [36767]: https://github.com/rust-lang/rust/pull/36767
2453 [36794]: https://github.com/rust-lang/rust/pull/36794
2454 [36798]: https://github.com/rust-lang/rust/pull/36798
2455 [36819]: https://github.com/rust-lang/rust/pull/36819
2456 [36822]: https://github.com/rust-lang/rust/pull/36822
2457 [36825]: https://github.com/rust-lang/rust/pull/36825
2458 [36843]: https://github.com/rust-lang/rust/pull/36843
2459 [36880]: https://github.com/rust-lang/rust/pull/36880
2460 [36886]: https://github.com/rust-lang/rust/issues/36886
2461 [36887]: https://github.com/rust-lang/rust/issues/36887
2462 [36888]: https://github.com/rust-lang/rust/issues/36888
2463 [36889]: https://github.com/rust-lang/rust/issues/36889
2464 [36890]: https://github.com/rust-lang/rust/issues/36890
2465 [36891]: https://github.com/rust-lang/rust/issues/36891
2466 [36892]: https://github.com/rust-lang/rust/issues/36892
2467 [36894]: https://github.com/rust-lang/rust/pull/36894
2468 [36917]: https://github.com/rust-lang/rust/pull/36917
2469 [36993]: https://github.com/rust-lang/rust/pull/36993
2470 [37037]: https://github.com/rust-lang/rust/pull/37037
2471 [37064]: https://github.com/rust-lang/rust/pull/37064
2472 [37094]: https://github.com/rust-lang/rust/pull/37094
2473 [37108]: https://github.com/rust-lang/rust/pull/37108
2474 [37111]: https://github.com/rust-lang/rust/pull/37111
2475 [37161]: https://github.com/rust-lang/rust/pull/37161
2476 [37162]: https://github.com/rust-lang/rust/pull/37162
2477 [37167]: https://github.com/rust-lang/rust/pull/37167
2478 [37178]: https://github.com/rust-lang/rust/pull/37178
2479 [37200]: https://github.com/rust-lang/rust/pull/37200
2480 [37213]: https://github.com/rust-lang/rust/pull/37213
2481 [37221]: https://github.com/rust-lang/rust/pull/37221
2482 [37224]: https://github.com/rust-lang/rust/pull/37224
2483 [37230]: https://github.com/rust-lang/rust/pull/37230
2484 [37231]: https://github.com/rust-lang/rust/pull/37231
2485 [37247]: https://github.com/rust-lang/rust/pull/37247
2486 [37267]: https://github.com/rust-lang/rust/pull/37267
2487 [37270]: https://github.com/rust-lang/rust/pull/37270
2488 [37273]: https://github.com/rust-lang/rust/pull/37273
2489 [37280]: https://github.com/rust-lang/rust/pull/37280
2490 [37298]: https://github.com/rust-lang/rust/pull/37298
2491 [37306]: https://github.com/rust-lang/rust/pull/37306
2492 [37310]: https://github.com/rust-lang/rust/pull/37310
2493 [37312]: https://github.com/rust-lang/rust/pull/37312
2494 [37313]: https://github.com/rust-lang/rust/pull/37313
2495 [37315]: https://github.com/rust-lang/rust/pull/37315
2496 [37318]: https://github.com/rust-lang/rust/pull/37318
2497 [37322]: https://github.com/rust-lang/rust/pull/37322
2498 [37326]: https://github.com/rust-lang/rust/pull/37326
2499 [37351]: https://github.com/rust-lang/rust/pull/37351
2500 [37356]: https://github.com/rust-lang/rust/pull/37356
2501 [37367]: https://github.com/rust-lang/rust/pull/37367
2502 [37373]: https://github.com/rust-lang/rust/pull/37373
2503 [37378]: https://github.com/rust-lang/rust/pull/37378
2504 [37389]: https://github.com/rust-lang/rust/pull/37389
2505 [37392]: https://github.com/rust-lang/rust/pull/37392
2506 [37427]: https://github.com/rust-lang/rust/pull/37427
2507 [37439]: https://github.com/rust-lang/rust/pull/37439
2508 [37445]: https://github.com/rust-lang/rust/pull/37445
2509 [37470]: https://github.com/rust-lang/rust/pull/37470
2510 [37569]: https://github.com/rust-lang/rust/pull/37569
2511 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2512 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
2513 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
2514 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
2515 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
2516 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
2517 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
2520 Version 1.13.0 (2016-11-10)
2521 ===========================
2526 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
2527 errors, like the `try!` macro, described in [RFC 0243].
2528 * [Stabilize macros in type position][36014]. Described in [RFC 873].
2529 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
2530 * [Fix `#[derive]` for empty tuple structs/variants][35728]
2531 * [Fix lifetime rules for 'if' conditions][36029]
2532 * [Avoid loading and parsing unconfigured non-inline modules][36482]
2537 * [Add the `-C link-arg` argument][36574]
2538 * [Remove the old AST-based backend from rustc_trans][35764]
2539 * [Don't enable NEON by default on armv7 Linux][35814]
2540 * [Fix debug line number info for macro expansions][35238]
2541 * [Do not emit "class method" debuginfo for types that are not
2542 DICompositeType][36008]
2543 * [Warn about multiple conflicting #[repr] hints][34623]
2544 * [When sizing DST, don't double-count nested struct prefixes][36351]
2545 * [Default RUST_MIN_STACK to 16MiB for now][36505]
2546 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
2547 * [Reject macros with empty repetitions to avoid infinite loop][36721]
2548 * [Expand macros without recursing to avoid stack overflows][36214]
2553 * [Replace macro backtraces with labeled local uses][35702]
2554 * [Improve error message for misplaced doc comments][33922]
2555 * [Buffer unix and lock windows to prevent message interleaving][35975]
2556 * [Update lifetime errors to specifically note temporaries][36171]
2557 * [Special case a few colors for Windows][36178]
2558 * [Suggest `use self` when such an import resolves][36289]
2559 * [Be more specific when type parameter shadows primitive type][36338]
2560 * Many minor improvements
2562 Compile-time Optimizations
2563 --------------------------
2565 * [Compute and cache HIR hashes at beginning][35854]
2566 * [Don't hash types in loan paths][36004]
2567 * [Cache projections in trans][35761]
2568 * [Optimize the parser's last token handling][36527]
2569 * [Only instantiate #[inline] functions in codegen units referencing
2570 them][36524]. This leads to big improvements in cases where crates export
2571 define many inline functions without using them directly.
2572 * [Lazily allocate TypedArena's first chunk][36592]
2573 * [Don't allocate during default HashSet creation][36734]
2580 * [`overflowing_abs`]
2581 * [`RefCell::try_borrow`]
2582 * [`RefCell::try_borrow_mut`]
2587 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2588 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2590 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2591 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2592 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2593 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2594 * [Use arc4rand on FreeBSD][35884]
2595 * [memrchr: Correct aligned offset computation][35969]
2596 * [Improve Demangling of Rust Symbols][36059]
2597 * [Use monotonic time in condition variables][35048]
2598 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2599 * [Implement conversion traits for `char`][35755]
2600 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2601 * [Zero first byte of CString on drop][36264]
2602 * [Inherit overflow checks for sum and product][36372]
2603 * [Add missing Eq implementations][36423]
2604 * [Implement `Debug` for `DirEntry`][36631]
2605 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2607 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2608 * [Implement more traits for `std::io::ErrorKind`][35911]
2609 * [Optimize BinaryHeap bounds checking][36072]
2610 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2611 `extend_with_element`][36355]
2612 * [Fix overflow checking in unsigned pow()][34942]
2617 * This release includes security fixes to both curl and OpenSSL.
2618 * [Fix transitive doctests when panic=abort][cargo/3021]
2619 * [Add --all-features flag to cargo][cargo/3038]
2620 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2621 * [Don't parse the home directory more than once][cargo/3078]
2622 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2623 * [Update OpenSSL to 1.0.2j][cargo/3121]
2624 * [Add license and license_file to cargo metadata output][cargo/3110]
2625 * [Make crates-io registry URL optional in config; ignore all changes to
2626 source.crates-io][cargo/3089]
2627 * [Don't download dependencies from other platforms][cargo/3123]
2628 * [Build transitive dev-dependencies when needed][cargo/3125]
2629 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2630 * [Avoid updating registry when adding existing deps][cargo/3144]
2631 * [Warn about path overrides that won't work][cargo/3136]
2632 * [Use workspaces during `cargo install`][cargo/3146]
2633 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2634 * [Add --message-format flag][cargo/3000]
2635 * [Pass target environment for rustdoc][cargo/3205]
2636 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2637 * [Update curl and curl-sys][cargo/3241]
2638 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2643 * [rustdoc: Add the `--sysroot` argument][36586]
2644 * [rustdoc: Fix a couple of issues with the search results][35655]
2645 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2646 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2647 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2652 * [Remove unmaintained style guide][35124]
2653 * [Add s390x support][36369]
2654 * [Initial work at Haiku OS support][36727]
2655 * [Add mips-uclibc targets][35734]
2656 * [Crate-ify compiler-rt into compiler-builtins][35021]
2657 * [Add rustc version info (git hash + date) to dist tarball][36213]
2658 * Many documentation improvements
2663 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2664 * [Deny (by default) transmuting from fn item types to pointer-sized
2665 types][34923]. Continuing the long transition to zero-sized fn items,
2667 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2669 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2670 * [Fix lifetime rules for 'if' conditions][36029].
2671 * [Inherit overflow checks for sum and product][36372].
2672 * [Forbid user-defined macros named "macro_rules"][36730].
2674 [33922]: https://github.com/rust-lang/rust/pull/33922
2675 [34623]: https://github.com/rust-lang/rust/pull/34623
2676 [34923]: https://github.com/rust-lang/rust/pull/34923
2677 [34942]: https://github.com/rust-lang/rust/pull/34942
2678 [34982]: https://github.com/rust-lang/rust/pull/34982
2679 [35021]: https://github.com/rust-lang/rust/pull/35021
2680 [35048]: https://github.com/rust-lang/rust/pull/35048
2681 [35074]: https://github.com/rust-lang/rust/pull/35074
2682 [35124]: https://github.com/rust-lang/rust/pull/35124
2683 [35234]: https://github.com/rust-lang/rust/pull/35234
2684 [35238]: https://github.com/rust-lang/rust/pull/35238
2685 [35354]: https://github.com/rust-lang/rust/pull/35354
2686 [35559]: https://github.com/rust-lang/rust/pull/35559
2687 [35585]: https://github.com/rust-lang/rust/pull/35585
2688 [35627]: https://github.com/rust-lang/rust/pull/35627
2689 [35655]: https://github.com/rust-lang/rust/pull/35655
2690 [35702]: https://github.com/rust-lang/rust/pull/35702
2691 [35707]: https://github.com/rust-lang/rust/pull/35707
2692 [35728]: https://github.com/rust-lang/rust/pull/35728
2693 [35734]: https://github.com/rust-lang/rust/pull/35734
2694 [35755]: https://github.com/rust-lang/rust/pull/35755
2695 [35761]: https://github.com/rust-lang/rust/pull/35761
2696 [35764]: https://github.com/rust-lang/rust/pull/35764
2697 [35814]: https://github.com/rust-lang/rust/pull/35814
2698 [35854]: https://github.com/rust-lang/rust/pull/35854
2699 [35871]: https://github.com/rust-lang/rust/pull/35871
2700 [35884]: https://github.com/rust-lang/rust/pull/35884
2701 [35911]: https://github.com/rust-lang/rust/pull/35911
2702 [35969]: https://github.com/rust-lang/rust/pull/35969
2703 [35975]: https://github.com/rust-lang/rust/pull/35975
2704 [36004]: https://github.com/rust-lang/rust/pull/36004
2705 [36008]: https://github.com/rust-lang/rust/pull/36008
2706 [36014]: https://github.com/rust-lang/rust/pull/36014
2707 [36029]: https://github.com/rust-lang/rust/pull/36029
2708 [36059]: https://github.com/rust-lang/rust/pull/36059
2709 [36072]: https://github.com/rust-lang/rust/pull/36072
2710 [36101]: https://github.com/rust-lang/rust/pull/36101
2711 [36104]: https://github.com/rust-lang/rust/pull/36104
2712 [36171]: https://github.com/rust-lang/rust/pull/36171
2713 [36173]: https://github.com/rust-lang/rust/pull/36173
2714 [36178]: https://github.com/rust-lang/rust/pull/36178
2715 [36213]: https://github.com/rust-lang/rust/pull/36213
2716 [36214]: https://github.com/rust-lang/rust/pull/36214
2717 [36264]: https://github.com/rust-lang/rust/pull/36264
2718 [36266]: https://github.com/rust-lang/rust/pull/36266
2719 [36289]: https://github.com/rust-lang/rust/pull/36289
2720 [36338]: https://github.com/rust-lang/rust/pull/36338
2721 [36351]: https://github.com/rust-lang/rust/pull/36351
2722 [36355]: https://github.com/rust-lang/rust/pull/36355
2723 [36369]: https://github.com/rust-lang/rust/pull/36369
2724 [36372]: https://github.com/rust-lang/rust/pull/36372
2725 [36423]: https://github.com/rust-lang/rust/pull/36423
2726 [36482]: https://github.com/rust-lang/rust/pull/36482
2727 [36505]: https://github.com/rust-lang/rust/pull/36505
2728 [36524]: https://github.com/rust-lang/rust/pull/36524
2729 [36527]: https://github.com/rust-lang/rust/pull/36527
2730 [36551]: https://github.com/rust-lang/rust/pull/36551
2731 [36574]: https://github.com/rust-lang/rust/pull/36574
2732 [36586]: https://github.com/rust-lang/rust/pull/36586
2733 [36592]: https://github.com/rust-lang/rust/pull/36592
2734 [36631]: https://github.com/rust-lang/rust/pull/36631
2735 [36639]: https://github.com/rust-lang/rust/pull/36639
2736 [36721]: https://github.com/rust-lang/rust/pull/36721
2737 [36727]: https://github.com/rust-lang/rust/pull/36727
2738 [36730]: https://github.com/rust-lang/rust/pull/36730
2739 [36734]: https://github.com/rust-lang/rust/pull/36734
2740 [36754]: https://github.com/rust-lang/rust/pull/36754
2741 [36995]: https://github.com/rust-lang/rust/pull/36995
2742 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2743 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2744 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2745 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2746 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2747 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2748 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2749 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2750 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2751 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2752 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2753 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2754 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2755 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2756 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2757 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2758 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2759 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2760 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2761 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2762 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2763 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2764 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2765 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2766 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2767 [rustup]: https://www.rustup.rs
2768 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2769 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2770 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2771 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2772 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2773 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2774 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2777 Version 1.12.1 (2016-10-20)
2778 ===========================
2783 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2784 * [Confusion with double negation and booleans][36856]
2785 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2786 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2787 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2788 * [Corrupted memory after updated to 1.12][36936]
2789 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2790 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2791 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2793 [36381]: https://github.com/rust-lang/rust/issues/36381
2794 [36856]: https://github.com/rust-lang/rust/issues/36856
2795 [36875]: https://github.com/rust-lang/rust/issues/36875
2796 [36924]: https://github.com/rust-lang/rust/issues/36924
2797 [36926]: https://github.com/rust-lang/rust/issues/36926
2798 [36936]: https://github.com/rust-lang/rust/issues/36936
2799 [37026]: https://github.com/rust-lang/rust/issues/37026
2800 [37112]: https://github.com/rust-lang/rust/issues/37112
2801 [37153]: https://github.com/rust-lang/rust/issues/37153
2804 Version 1.12.0 (2016-09-29)
2805 ===========================
2810 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2811 This translation pass is far simpler than the previous AST->LLVM pass, and
2812 creates opportunities to perform new optimizations directly on the MIR. It
2813 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2814 * [`rustc` presents a new, more readable error format, along with
2815 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2816 Most common editors supporting Rust have been updated to work with it. It was
2817 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2822 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2823 This translation pass is far simpler than the previous AST->LLVM pass, and
2824 creates opportunities to perform new optimizations directly on the MIR. It
2825 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2826 * [Print the Rust target name, not the LLVM target name, with
2827 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2828 * [The computation of `TypeId` is correct in some cases where it was previously
2829 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2830 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2831 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2832 `--print relocation-models`, and `--print code-models` print the available
2833 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2834 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2835 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2836 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2837 These targets produce statically-linked binaries. There are no binary release
2843 * [`rustc` presents a new, more readable error format, along with
2844 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2845 Most common editors supporting Rust have been updated to work with it. It was
2846 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2847 * [In error descriptions, references are now described in plain English,
2848 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2849 * [In error type descriptions, unknown numeric types are named `{integer}` or
2850 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2851 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2856 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2857 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2858 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2859 useful](https://github.com/rust-lang/rust/pull/34908)
2860 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2861 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2862 * [Semicolons are properly required as statement delimiters inside
2863 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2864 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2869 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2870 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2871 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2872 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2873 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2874 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2875 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2876 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2877 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2878 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2879 Both on Unix and Windows.
2880 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2881 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2882 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2883 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2884 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2885 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2886 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2887 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2892 * [The `format!` macro and friends now allow a single argument to be formatted
2893 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2894 * [The lifetime bounds on `[T]::binary_search_by` and
2895 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2896 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2897 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2898 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2899 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2900 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2901 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2902 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2903 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2904 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2905 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2906 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2907 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2908 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2909 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2910 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2911 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2912 * [`mpsc::sync_channel` `Receiver`s return any available message before
2913 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2914 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2915 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2920 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2921 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2922 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2923 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2924 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2925 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2926 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2927 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2928 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2929 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2930 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2931 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2932 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2933 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2934 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2935 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2940 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2941 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2946 * [Test binaries now support a `--test-threads` argument to specify the number
2947 of threads used to run tests, and which acts the same as the
2948 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2949 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2950 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2951 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2952 * [Rust releases now come with source packages that can be installed by rustup
2953 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2954 The resulting source code can be used by tools and IDES, located in the
2955 sysroot under `lib/rustlib/src`.
2960 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2961 * Many minor improvements to the documentation.
2962 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2967 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2968 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2969 * [When formatting strings, if "precision" is specified, the "fill",
2970 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2971 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2974 Version 1.11.0 (2016-08-18)
2975 ===========================
2980 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2981 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2982 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2983 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2984 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2989 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2990 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2991 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2992 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2993 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2994 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2995 (in libcore - previously stabilized in libstd)
2996 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2997 (in libcore - previously stabilized in libstd)
2998 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2999 (in libcore - previously stabilized in libstd)
3000 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3001 (in libcore - previously stabilized in libstd)
3002 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3003 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3004 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3005 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3010 * [The `thread_local!` macro supports multiple definitions in a single
3011 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3012 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3013 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3014 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3015 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3016 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3017 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3018 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3023 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3024 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3025 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3026 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3027 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3028 and `-vv` prints warnings for all crates.
3029 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3030 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3031 This provides room for expansion by arbitrary tools.
3032 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3033 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3034 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3035 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3036 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3037 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3038 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3043 * [Caching projections speeds up type check dramatically for some
3044 workloads](https://github.com/rust-lang/rust/pull/33816)
3045 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3046 This hasher is faster, but is believed to provide sufficient
3047 protection from collision attacks.
3048 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3053 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3054 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3055 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3056 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3057 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3062 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3063 * [When emitting debug info, rustc emits frame pointers for closures,
3064 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3065 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3066 * Many more errors have been given error codes and extended
3068 * API documentation continues to be improved, with many new examples
3073 * [rustc no longer hangs when dependencies recursively re-export
3074 submodules](https://github.com/rust-lang/rust/pull/34542)
3075 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3076 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3077 rewritten](https://github.com/rust-lang/rust/pull/33895)
3078 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3079 No targets use this yet, but it works toward AVR support.
3084 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3085 * [The new follow-set rules that place restrictions on `macro_rules!`
3086 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3087 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3088 and has been a warning since 1.10.
3089 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3090 This causes breakage in some corner cases.
3093 Version 1.10.0 (2016-07-07)
3094 ===========================
3099 * [Allow `concat_idents!` in type positions as well as in expression
3100 positions](https://github.com/rust-lang/rust/pull/33735).
3101 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3102 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3103 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3104 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3105 * [`panic!` can be converted to a runtime abort with the
3106 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3107 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3108 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3109 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3110 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3111 Note that Cargo does not yet directly support cdylibs.
3116 * `os::windows::fs::OpenOptionsExt::access_mode`
3117 * `os::windows::fs::OpenOptionsExt::share_mode`
3118 * `os::windows::fs::OpenOptionsExt::custom_flags`
3119 * `os::windows::fs::OpenOptionsExt::attributes`
3120 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3121 * `os::unix::fs::OpenOptionsExt::custom_flags`
3122 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3123 * `Default for sync::Weak`
3124 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3125 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3126 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3127 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3128 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3129 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3130 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3131 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3132 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3133 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3134 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3135 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3136 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3137 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3138 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3139 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3140 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3141 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3142 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3143 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3144 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3145 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3146 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3147 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3148 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3149 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3150 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3151 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3152 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3153 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3154 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3155 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3156 * Read/Write/RawFd impls for `UnixStream`
3157 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3158 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3159 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3160 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3161 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3162 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3163 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3164 * RawFd impls for `UnixListener`
3165 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3166 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3167 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3168 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3169 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3170 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3171 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3172 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3173 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3174 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3175 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3176 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3177 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3178 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3179 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3180 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3181 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3182 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3183 * RawFd impls for `UnixDatagram`
3184 * `{BTree,Hash}Map::values_mut`
3185 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3190 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3191 The semantics of this minor method are subtle and probably not what
3193 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3194 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3195 will fall back to `/dev/urandom` temporarily to avoid blocking
3196 during early boot](https://github.com/rust-lang/rust/pull/33086).
3197 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3198 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3199 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3200 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3201 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3202 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3203 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3207 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3208 This controls the runtime behavior of the `panic!` macro
3209 and can be either "unwind" (the default), or "abort".
3210 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3211 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3212 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3213 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3214 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3215 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3216 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3217 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3218 By default they are retried twice, which can be customized with the
3219 `net.retry` value in `.cargo/config`.
3220 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3221 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3222 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3223 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3224 Makes it possible to install multiple crates in parallel.
3225 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3226 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3227 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3228 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3229 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3230 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3235 * [rustc memory usage was reduced by refactoring the context used for
3236 type checking](https://github.com/rust-lang/rust/pull/33425).
3237 * [Speed up creation of `HashMap`s by caching the random keys used
3238 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3239 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3240 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3241 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3242 10x faster than the previous lookup tables.
3243 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3248 * Many incremental improvements to documentation and rustdoc.
3249 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3250 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3251 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3252 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3253 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3254 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3255 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3260 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3261 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3262 * [`std` no longer prints backtraces on platforms where the running
3263 module must be loaded with `env::current_exe`, which can't be relied
3264 on](https://github.com/rust-lang/rust/pull/33554).
3265 * This release includes std binaries for the i586-unknown-linux-gnu,
3266 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3267 i586 target is for old x86 hardware without SSE2, and the armv7
3268 target is for Android running on modern ARM architectures.
3269 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3270 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3271 * [On Unix the runtime aborts by calling `libc::abort` instead of
3272 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3273 * [Rust is now bootstrapped from the previous release of Rust,
3274 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3279 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3280 * [`target_env` for Linux ARM targets is just `gnu`, not
3281 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3282 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3283 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3284 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3285 Affects how macros are parsed.
3286 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3287 * [Feature-gated attributes on macro-generated macro invocations are
3288 now rejected](https://github.com/rust-lang/rust/pull/32791).
3289 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3290 This caused some minor changes to type inference.
3293 Version 1.9.0 (2016-05-26)
3294 ==========================
3299 * The `#[deprecated]` attribute when applied to an API will generate
3300 warnings when used. The warnings may be suppressed with
3301 `#[allow(deprecated)]`. [RFC 1270].
3302 * [`fn` item types are zero sized, and each `fn` names a unique
3303 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3304 `transmute` on a `fn` type will generate a warning for a few cycles,
3305 then will be converted to an error.
3306 * [Field and method resolution understand visibility, so private
3307 fields and methods cannot prevent the proper use of public fields
3308 and methods][1.9fv].
3309 * [The parser considers unicode codepoints in the
3310 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3316 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3317 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3318 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3319 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3320 * [`str::is_char_boundary`]
3321 * [`<*const T>::as_ref`]
3322 * [`<*mut T>::as_ref`]
3323 * [`<*mut T>::as_mut`]
3324 * [`AsciiExt::make_ascii_uppercase`]
3325 * [`AsciiExt::make_ascii_lowercase`]
3326 * [`char::decode_utf16`]
3327 * [`char::DecodeUtf16`]
3328 * [`char::DecodeUtf16Error`]
3329 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3330 * [`BTreeSet::take`]
3331 * [`BTreeSet::replace`]
3334 * [`HashSet::replace`]
3336 * [`OsString::with_capacity`]
3337 * [`OsString::clear`]
3338 * [`OsString::capacity`]
3339 * [`OsString::reserve`]
3340 * [`OsString::reserve_exact`]
3341 * [`OsStr::is_empty`]
3343 * [`std::os::unix::thread`]
3346 * [`JoinHandleExt::as_pthread_t`]
3347 * [`JoinHandleExt::into_pthread_t`]
3348 * [`HashSet::hasher`]
3349 * [`HashMap::hasher`]
3350 * [`CommandExt::exec`]
3351 * [`File::try_clone`]
3352 * [`SocketAddr::set_ip`]
3353 * [`SocketAddr::set_port`]
3354 * [`SocketAddrV4::set_ip`]
3355 * [`SocketAddrV4::set_port`]
3356 * [`SocketAddrV6::set_ip`]
3357 * [`SocketAddrV6::set_port`]
3358 * [`SocketAddrV6::set_flowinfo`]
3359 * [`SocketAddrV6::set_scope_id`]
3360 * [`slice::copy_from_slice`]
3361 * [`ptr::read_volatile`]
3362 * [`ptr::write_volatile`]
3363 * [`OpenOptions::create_new`]
3364 * [`TcpStream::set_nodelay`]
3365 * [`TcpStream::nodelay`]
3366 * [`TcpStream::set_ttl`]
3367 * [`TcpStream::ttl`]
3368 * [`TcpStream::set_only_v6`]
3369 * [`TcpStream::only_v6`]
3370 * [`TcpStream::take_error`]
3371 * [`TcpStream::set_nonblocking`]
3372 * [`TcpListener::set_ttl`]
3373 * [`TcpListener::ttl`]
3374 * [`TcpListener::set_only_v6`]
3375 * [`TcpListener::only_v6`]
3376 * [`TcpListener::take_error`]
3377 * [`TcpListener::set_nonblocking`]
3378 * [`UdpSocket::set_broadcast`]
3379 * [`UdpSocket::broadcast`]
3380 * [`UdpSocket::set_multicast_loop_v4`]
3381 * [`UdpSocket::multicast_loop_v4`]
3382 * [`UdpSocket::set_multicast_ttl_v4`]
3383 * [`UdpSocket::multicast_ttl_v4`]
3384 * [`UdpSocket::set_multicast_loop_v6`]
3385 * [`UdpSocket::multicast_loop_v6`]
3386 * [`UdpSocket::set_multicast_ttl_v6`]
3387 * [`UdpSocket::multicast_ttl_v6`]
3388 * [`UdpSocket::set_ttl`]
3389 * [`UdpSocket::ttl`]
3390 * [`UdpSocket::set_only_v6`]
3391 * [`UdpSocket::only_v6`]
3392 * [`UdpSocket::join_multicast_v4`]
3393 * [`UdpSocket::join_multicast_v6`]
3394 * [`UdpSocket::leave_multicast_v4`]
3395 * [`UdpSocket::leave_multicast_v6`]
3396 * [`UdpSocket::take_error`]
3397 * [`UdpSocket::connect`]
3398 * [`UdpSocket::send`]
3399 * [`UdpSocket::recv`]
3400 * [`UdpSocket::set_nonblocking`]
3405 * [`std::sync::Once` is poisoned if its initialization function
3407 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
3408 * [Most types implement `fmt::Debug`][1.9db].
3409 * [The default buffer size used by `BufReader` and `BufWriter` was
3410 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
3411 used by other languages.
3412 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
3413 `Duration` additionally implements `*=` and `/=`][1.9ta].
3414 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
3415 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
3416 * [`Chain` implements `BufRead`][1.9ch].
3417 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
3422 * [Cargo can now run concurrently][1.9cc].
3423 * [Top-level overrides allow specific revisions of crates to be
3424 overridden through the entire crate graph][1.9ct]. This is intended
3425 to make upgrades easier for large projects, by allowing crates to be
3426 forked temporarily until they've been upgraded and republished.
3427 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
3428 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
3429 on the commandline][1.9cf]. `rustc` arguments can also be specified
3430 in the `build.rustflags` configuration key.
3435 * [The time complexity of comparing variables for equivalence during type
3436 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
3437 to major compilation time improvement in some scenarios.
3438 * [`ToString` is specialized for `str`, giving it the same performance
3439 as `to_owned`][1.9ts].
3440 * [Spawning processes with `Command::output` no longer creates extra
3442 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
3443 for C-like enums][1.9cl].
3448 * [Passing the `--quiet` flag to a test runner will produce
3449 much-abbreviated output][1.9q].
3450 * The Rust Project now publishes std binaries for the
3451 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
3452 `i586-pc-windows-msvc` targets.
3457 * [`std::sync::Once` is poisoned if its initialization function
3459 * [It is illegal to define methods with the same name in overlapping
3460 inherent `impl` blocks][1.9sn].
3461 * [`fn` item types are zero sized, and each `fn` names a unique
3462 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3463 `transmute` on a `fn` type will generate a warning for a few cycles,
3464 then will be converted to an error.
3465 * [Improvements to const evaluation may trigger new errors when integer
3466 literals are out of range][1.9ce].
3469 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
3470 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
3471 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
3472 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
3473 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
3474 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
3475 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
3476 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
3477 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
3478 [1.9db]: https://github.com/rust-lang/rust/pull/32054
3479 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
3480 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
3481 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
3482 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
3483 [1.9o]: https://github.com/rust-lang/rust/pull/32325
3484 [1.9q]: https://github.com/rust-lang/rust/pull/31887
3485 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
3486 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
3487 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
3488 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
3489 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
3490 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
3491 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
3492 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
3493 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3494 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
3495 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
3496 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
3497 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
3498 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
3499 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
3500 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
3501 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
3502 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
3503 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
3504 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
3505 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
3506 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
3507 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
3508 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
3509 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
3510 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
3511 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
3512 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
3513 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
3514 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
3515 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
3516 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
3517 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
3518 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
3519 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
3520 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
3521 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
3522 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
3523 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
3524 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
3525 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
3526 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
3527 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
3528 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
3529 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3530 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3531 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3532 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3533 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3534 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3535 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
3536 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
3537 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
3538 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
3539 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
3540 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
3541 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
3542 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
3543 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
3544 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
3545 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
3546 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
3547 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
3548 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
3549 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
3550 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
3551 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
3552 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
3553 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
3554 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
3555 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
3556 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
3557 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
3558 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
3559 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
3560 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
3561 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
3562 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
3563 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
3564 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
3565 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
3566 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
3567 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
3568 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
3569 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3570 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3571 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3572 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3573 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3574 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3575 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3576 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3577 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3578 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3581 Version 1.8.0 (2016-04-14)
3582 ==========================
3587 * Rust supports overloading of compound assignment statements like
3588 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3589 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3590 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3592 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3593 addition to the non-braced form, `struct Foo;`. [RFC 218].
3599 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3600 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3603 * [`ptr::drop_in_place`]
3605 * [`time::SystemTime`]
3607 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3608 * [`Instant::elapsed`]
3609 * [`SystemTime::now`]
3610 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3611 * [`SystemTime::elapsed`]
3612 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3613 * [`SystemTimeError`]
3614 * [`SystemTimeError::duration`]
3615 * Various impls for `SystemTimeError`
3617 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3618 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3619 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3620 * [The `write!` and `writeln!` macros correctly emit errors if any of
3621 their arguments can't be formatted][1.8w].
3622 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3623 * [The Unix-specific `raw` modules, which contain a number of
3624 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3625 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3626 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3627 across platforms was making it difficult to implement `std`
3628 correctly. Those that need these definitions should use the `libc`
3630 * The Unix-specific `MetadataExt` traits, including
3631 `os::unix::fs::MetadataExt`, which expose values such as inode
3632 numbers [no longer return platform-specific types][1.8r], but
3633 instead return widened integers. [RFC 1415].
3634 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3635 * [Atomic loads and stores are not volatile][1.8a].
3636 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3641 * [Inlining hash functions lead to a 3% compile-time improvement in
3642 some workloads][1.8h].
3643 * When using jemalloc, its symbols are [unprefixed so that it
3644 overrides the libc malloc implementation][1.8h]. This means that for
3645 rustc, LLVM is now using jemalloc, which results in a 6%
3646 compile-time improvement on a specific workload.
3647 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3652 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3653 i686-pc-windows-msvc is now considered a tier-1 platform.
3654 * [The `--print targets` flag prints a list of supported targets][1.8t].
3655 * [The `--print cfg` flag prints the `cfg`s defined for the current
3657 * [`rustc` can be built with an new Cargo-based build system, written
3658 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3659 build system. To enable it configure with `configure --rustbuild`.
3660 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3661 variants while also indicating the total number of missing variants
3662 if more than 3][1.8m].
3663 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3664 * The Rust Project now publishes binary releases of the standard
3665 library for a number of tier-2 targets:
3666 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3667 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3668 `x86_64-rumprun-netbsd`. These can be installed with
3669 tools such as [multirust][1.8mr].
3674 * [`cargo init` creates a new Cargo project in the current
3675 directory][1.8ci]. It is otherwise like `cargo new`.
3676 * [Cargo has configuration keys for `-v` and
3677 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3678 `[term]` section of `.cargo/config`.
3679 * [Configuration keys that evaluate to strings or integers can be set
3680 via environment variables][1.8ce]. For example the `build.jobs` key
3681 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3682 precedence over config files.
3683 * [Target-specific dependencies support Rust `cfg` syntax for
3684 describing targets][1.8cfg] so that dependencies for multiple
3685 targets can be specified together. [RFC 1361].
3686 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3687 `RUSTDOC` take precedence over the `build.target-dir`,
3688 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3689 * [The child process tree is killed on Windows when Cargo is
3691 * [The `build.target` configuration value sets the target platform,
3692 like `--target`][1.8ct].
3697 * [Unstable compiler flags have been further restricted][1.8u]. Since
3698 1.0 `-Z` flags have been considered unstable, and other flags that
3699 were considered unstable additionally required passing `-Z
3700 unstable-options` to access. Unlike unstable language and library
3701 features though, these options have been accessible on the stable
3702 release channel. Going forward, *new unstable flags will not be
3703 available on the stable release channel*, and old unstable flags
3704 will warn about their usage. In the future, all unstable flags will
3705 be unavailable on the stable release channel.
3706 * [It is no longer possible to `match` on empty enum variants using
3707 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3708 * The Unix-specific `MetadataExt` traits, including
3709 `os::unix::fs::MetadataExt`, which expose values such as inode
3710 numbers [no longer return platform-specific types][1.8r], but
3711 instead return widened integers. [RFC 1415].
3712 * [Modules sourced from the filesystem cannot appear within arbitrary
3713 blocks, but only within other modules][1.8mf].
3714 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3715 * On Unix, [stack overflow triggers a runtime abort instead of a
3717 * [`Command::spawn` and its equivalents return an error if any of
3718 its command-line arguments contain interior `NUL`s][1.8n].
3719 * [Tuple and unit enum variants from other crates are in the type
3721 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3722 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3723 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3724 instead of `foo.lib`.
3727 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3728 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3729 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3730 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3731 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3732 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3733 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3734 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3735 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3736 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3737 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3738 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3739 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3740 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3741 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3742 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3743 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3744 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3745 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3746 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3747 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3748 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3749 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3750 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3751 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3752 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3753 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3754 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3755 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3756 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3757 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3758 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3759 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3760 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3761 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3762 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3763 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3764 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3765 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3766 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3767 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3768 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3769 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3770 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3771 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3772 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3773 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3774 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3775 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3776 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3777 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3778 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3779 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3780 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3781 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3782 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3783 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3784 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3785 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3786 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3789 Version 1.7.0 (2016-03-03)
3790 ==========================
3797 * [`Path::strip_prefix`][] (renamed from relative_from)
3798 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3800 * [`Ipv4Addr::is_loopback`]
3801 * [`Ipv4Addr::is_private`]
3802 * [`Ipv4Addr::is_link_local`]
3803 * [`Ipv4Addr::is_multicast`]
3804 * [`Ipv4Addr::is_broadcast`]
3805 * [`Ipv4Addr::is_documentation`]
3807 * [`Ipv6Addr::is_unspecified`]
3808 * [`Ipv6Addr::is_loopback`]
3809 * [`Ipv6Addr::is_multicast`]
3812 * [`Vec::as_mut_slice`]
3814 * [`String::as_str`]
3815 * [`String::as_mut_str`]
3817 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3819 * `<[T]>::`[`sort_by_key`]
3820 * checked, saturated, and overflowing operations
3821 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3822 * [`i32::saturating_mul`]
3823 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3824 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3825 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3826 * [`u32::saturating_mul`]
3827 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3828 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3829 * and checked, saturated, and overflowing operations for other primitive types
3831 * [`ffi::IntoStringError`]
3832 * [`CString::into_string`]
3833 * [`CString::into_bytes`]
3834 * [`CString::into_bytes_with_nul`]
3835 * `From<CString> for Vec<u8>`
3837 * [`IntoStringError::into_cstring`]
3838 * [`IntoStringError::utf8_error`]
3839 * `Error for IntoStringError`
3841 * [`std::hash::BuildHasher`]
3842 * [`BuildHasher::Hasher`]
3843 * [`BuildHasher::build_hasher`]
3844 * [`std::hash::BuildHasherDefault`]
3845 * [`HashMap::with_hasher`]
3846 * [`HashMap::with_capacity_and_hasher`]
3847 * [`HashSet::with_hasher`]
3848 * [`HashSet::with_capacity_and_hasher`]
3849 * [`std::collections::hash_map::RandomState`]
3850 * [`RandomState::new`]
3851 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3852 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3853 from bytes is faster.
3854 * [The performance of `LineWriter` (and thus `io::stdout`) was
3855 improved by using `memchr` to search for newlines][1.7m].
3856 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3857 `f64` variants were stabilized previously.
3858 * [`BTreeMap` was rewritten to use less memory and improve the performance
3859 of insertion and iteration, the latter by as much as 5x][1.7bm].
3860 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3861 covariant over their contained type][1.7bt].
3862 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3863 over their contained type][1.7ll].
3864 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3866 * [`Any` is implemented for unsized types][1.7a].
3867 * [`Hash` is implemented for `Duration`][1.7h].
3872 * [When running tests with `--test`, rustdoc will pass `--cfg`
3873 arguments to the compiler][1.7dt].
3874 * [The compiler is built with RPATH information by default][1.7rpa].
3875 This means that it will be possible to run `rustc` when installed in
3876 unusual configurations without configuring the dynamic linker search
3878 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3879 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3880 over `LD_LIBRARY_PATH`.
3885 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3886 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3887 * [The `rerun-if-changed` build script directive no longer causes the
3888 build script to incorrectly run twice in certain scenarios][1.7rr].
3893 * Soundness fixes to the interactions between associated types and
3894 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3895 code that violates the new rules. This is a significant change that
3896 is known to break existing code, so it has emitted warnings for the
3897 new error cases since 1.4 to give crate authors time to adapt. The
3898 details of what is changing are subtle; read the RFC for more.
3899 * [Several bugs in the compiler's visibility calculations were
3900 fixed][1.7v]. Since this was found to break significant amounts of
3901 code, the new errors will be emitted as warnings for several release
3902 cycles, under the `private_in_public` lint.
3903 * Defaulted type parameters were accidentally accepted in positions
3904 that were not intended. In this release, [defaulted type parameters
3905 appearing outside of type definitions will generate a
3906 warning][1.7d], which will become an error in future releases.
3907 * [Parsing "." as a float results in an error instead of 0][1.7p].
3908 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3909 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3911 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3912 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3913 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3914 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3915 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3916 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3917 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3918 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3919 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3920 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3921 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3922 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3923 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3924 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3925 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3926 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3927 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3928 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3929 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3930 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3931 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3932 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3933 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3934 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3935 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3936 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3937 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3938 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3939 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3940 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3941 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3942 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3943 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3944 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3945 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3946 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3947 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3948 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3949 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3950 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3951 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3952 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3953 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3954 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3955 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3956 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3957 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3958 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3959 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3960 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3961 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3962 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3963 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3964 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3965 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3966 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3967 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3968 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3969 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3970 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3971 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3972 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3973 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3974 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3975 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3976 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3977 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3978 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3979 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3980 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3981 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3982 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3983 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3984 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3985 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3986 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3987 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3988 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3989 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3992 Version 1.6.0 (2016-01-21)
3993 ==========================
3998 * The `#![no_std]` attribute causes a crate to not be linked to the
3999 standard library, but only the [core library][1.6co], as described
4000 in [RFC 1184]. The core library defines common types and traits but
4001 has no platform dependencies whatsoever, and is the basis for Rust
4002 software in environments that cannot support a full port of the
4003 standard library, such as operating systems. Most of the core
4004 library is now stable.
4010 [`Read::read_exact`],
4011 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4012 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4013 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4014 [`os::unix::fs::DirBuilderExt`],
4015 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4016 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4017 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4018 [`collections::hash_map::Drain`],
4019 [`collections::hash_map::HashMap::drain`],
4020 [`collections::hash_set::Drain`],
4021 [`collections::hash_set::HashSet::drain`],
4022 [`collections::binary_heap::Drain`],
4023 [`collections::binary_heap::BinaryHeap::drain`],
4024 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4025 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4026 [`RwLock::into_inner`],
4027 [`Iterator::min_by_key`][] (renamed from `min_by`),
4028 [`Iterator::max_by_key`][] (renamed from `max_by`).
4029 * The [core library][1.6co] is stable, as are most of its APIs.
4030 * [The `assert_eq!` macro supports arguments that don't implement
4031 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4033 * Several timer functions that take duration in milliseconds [are
4034 deprecated in favor of those that take `Duration`][1.6ms]. These
4035 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4036 `thread::park_timeout_ms`.
4037 * The algorithm by which `Vec` reserves additional elements was
4038 [tweaked to not allocate excessive space][1.6a] while still growing
4040 * `From` conversions are [implemented from integers to floats][1.6f]
4041 in cases where the conversion is lossless. Thus they are not
4042 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4043 or `f64`. They are also not implemented for `isize` and `usize`
4044 because the implementations would be platform-specific. `From` is
4045 also implemented from `f32` to `f64`.
4046 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4047 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4048 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4049 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4051 * Sorting slices that are already sorted [is 50% faster in some
4057 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4058 * Cargo build scripts can specify their dependencies by emitting the
4059 [`rerun-if-changed`][1.6rr] key.
4060 * crates.io will reject publication of crates with dependencies that
4061 have a wildcard version constraint. Crates with wildcard
4062 dependencies were seen to cause a variety of problems, as described
4063 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4065 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4066 release folder. A variety of artifacts that Cargo failed to clean
4067 are now correctly deleted.
4072 * The `unreachable_code` lint [warns when a function call's argument
4074 * The parser indicates [failures that may be caused by
4075 confusingly-similar Unicode characters][1.6uc]
4076 * Certain macro errors [are reported at definition time][1.6m], not
4082 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4083 environment variable when locating crates. This was a pre-cargo
4084 feature for integrating with the package manager that was
4085 accidentally never removed.
4086 * [A number of bugs were fixed in the privacy checker][1.6p] that
4087 could cause previously-accepted code to break.
4088 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4089 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4090 struct pattern syntax (`Foo(..)`) can no longer be used to match
4091 unit structs. This is a warning now, but will become an error in
4092 future releases. Patterns that share the same name as a const are
4094 * A bug was fixed that causes [rustc not to apply default type
4095 parameters][1.6xc] when resolving certain method implementations of
4096 traits defined in other crates.
4098 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4099 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4100 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4101 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4102 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4103 [1.6co]: http://doc.rust-lang.org/core/index.html
4104 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4105 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4106 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4107 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4108 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4109 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4110 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4111 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4112 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4113 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4114 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4115 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4116 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4117 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4118 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4119 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4120 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4121 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4122 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4123 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4124 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4125 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4126 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4127 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4128 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4129 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4130 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4131 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4132 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4133 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4134 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4135 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4136 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4137 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4138 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4139 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4140 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4141 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4142 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4143 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4144 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4147 Version 1.5.0 (2015-12-10)
4148 ==========================
4150 * ~700 changes, numerous bugfixes
4156 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4157 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4158 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4159 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4160 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4161 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4162 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4163 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4164 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4165 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4166 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4167 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4168 [`Path::read_link`], [`Path::symlink_metadata`],
4169 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4170 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4171 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4172 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4173 [`slice::split_first_mut`], [`slice::split_first`],
4174 [`slice::split_last_mut`], [`slice::split_last`],
4175 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4176 [`str::MatchIndices`], [`str::RMatchIndices`],
4177 [`str::match_indices`], [`str::rmatch_indices`],
4178 [`str::slice_mut_unchecked`], [`string::ParseError`].
4179 * Rust applications hosted on crates.io can be installed locally to
4180 `~/.cargo/bin` with the [`cargo install`] command. Among other
4181 things this makes it easier to augment Cargo with new subcommands:
4182 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4183 invoked as `cargo foo`.
4184 * Crates with wildcard (`*`) dependencies will [emit warnings when
4185 published][1.5w]. In 1.6 it will no longer be possible to publish
4186 crates with wildcard dependencies.
4191 * The rules determining when a particular lifetime must outlive
4192 a particular value (known as '[dropck]') have been [modified
4193 to not rely on parametricity][1.5p].
4194 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4195 and `Arc`][1.5a]. Because these smart pointer types implement
4196 `Deref`, this causes breakage in cases where the interior type
4197 contains methods of the same name.
4198 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4199 that they could drop their content. Soundness fix.
4200 * All method invocations are [properly checked][1.5wf1] for
4201 [well-formedness][1.5wf2]. Soundness fix.
4202 * Traits whose supertraits contain `Self` are [not object
4203 safe][1.5o]. Soundness fix.
4204 * Target specifications support a [`no_default_libraries`][1.5nd]
4205 setting that controls whether `-nodefaultlibs` is passed to the
4206 linker, and in turn the `is_like_windows` setting no longer affects
4207 the `-nodefaultlibs` flag.
4208 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4209 * The `#[inline]` and `#[repr]` attributes [can only appear
4210 in valid locations][1.5at].
4211 * Native libraries linked from the local crate are [passed to
4212 the linker before native libraries from upstream crates][1.5nl].
4213 * Two rarely-used attributes, `#[no_debug]` and
4214 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4215 * Negation of unsigned integers, which has been a warning for
4216 several releases, [is now behind a feature gate and will
4217 generate errors][1.5nu].
4218 * The parser accidentally accepted visibility modifiers on
4219 enum variants, a bug [which has been fixed][1.5ev].
4220 * [A bug was fixed that allowed `use` statements to import unstable
4226 * When evaluating expressions at compile-time that are not
4227 compile-time constants (const-evaluating expressions in non-const
4228 contexts), incorrect code such as overlong bitshifts and arithmetic
4229 overflow will [generate a warning instead of an error][1.5ce],
4230 delaying the error until runtime. This will allow the
4231 const-evaluator to be expanded in the future backwards-compatibly.
4232 * The `improper_ctypes` lint [no longer warns about using `isize` and
4233 `usize` in FFI][1.5ict].
4238 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4240 * `Default` is [implemented for mutable slices][1.5d].
4241 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4242 * There are now `From` conversions [between floating point
4243 types][1.5f] where the conversions are lossless.
4244 * There are now `From` conversions [between integer types][1.5i] where
4245 the conversions are lossless.
4246 * [`fs::Metadata` implements `Clone`][1.5fs].
4247 * The `parse` method [accepts a leading "+" when parsing
4249 * [`AsMut` is implemented for `Vec`][1.5am].
4250 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4251 been optimized][1.5cf] and no longer rely on the default impl.
4252 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4253 `unsafe extern "C"` function types now [implement `Clone`,
4254 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4255 `fmt::Debug` for up to 12 arguments][1.5fp].
4256 * [Dropping `Vec`s is much faster in unoptimized builds when the
4257 element types don't implement `Drop`][1.5dv].
4258 * A bug that caused in incorrect behavior when [combining `VecDeque`
4259 with zero-sized types][1.5vdz] was resolved.
4260 * [`PartialOrd` for slices is faster][1.5po].
4265 * [Crate metadata size was reduced by 20%][1.5md].
4266 * [Improvements to code generation reduced the size of libcore by 3.3
4267 MB and rustc's memory usage by 18MB][1.5m].
4268 * [Improvements to deref translation increased performance in
4269 unoptimized builds][1.5dr].
4270 * Various errors in trait resolution [are deduplicated to only be
4271 reported once][1.5te].
4272 * Rust has preliminary [support for rumprun kernels][1.5rr].
4273 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4275 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4276 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4277 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4278 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4279 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4280 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4281 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4282 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4283 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4284 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4285 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4286 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4287 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4288 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4289 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4290 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4291 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4292 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4293 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4294 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4295 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4296 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4297 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4298 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4299 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4300 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4301 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4302 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4303 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4304 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4305 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4306 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4307 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4308 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4309 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4310 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4311 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4312 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4313 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4314 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4315 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4316 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4317 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4318 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4319 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4320 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4321 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4322 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4323 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4324 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4325 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4326 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4327 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4328 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4329 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4330 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4331 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4332 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4333 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4334 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4335 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4336 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4337 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4338 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4339 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4340 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4341 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4342 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4343 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4344 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4345 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4346 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4347 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4348 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4349 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4350 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4351 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4352 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4353 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4354 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4355 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4356 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4357 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4358 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4359 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4360 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4361 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4362 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4363 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4365 Version 1.4.0 (2015-10-29)
4366 ==========================
4368 * ~1200 changes, numerous bugfixes
4373 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4374 GNU) are now supported and recommended for use.
4379 * [Several changes have been made to fix type soundness and improve
4380 the behavior of associated types][sound]. See [RFC 1214]. Although
4381 we have mostly introduced these changes as warnings this release, to
4382 become errors next release, there are still some scenarios that will
4383 see immediate breakage.
4384 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4385 line breaks in addition to `\n`][crlf].
4386 * [Loans of `'static` lifetime extend to the end of a function][stat].
4387 * [`str::parse` no longer introduces avoidable rounding error when
4388 parsing floating point numbers. Together with earlier changes to
4389 float formatting/output, "round trips" like f.to_string().parse()
4390 now preserve the value of f exactly. Additionally, leading plus
4391 signs are now accepted][fp3].
4397 * `use` statements that import multiple items [can now rename
4398 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
4399 * [Binops work correctly on fat pointers][binfat].
4400 * `pub extern crate`, which does not behave as expected, [issues a
4401 warning][pec] until a better solution is found.
4406 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
4407 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
4408 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
4409 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
4410 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
4411 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
4412 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
4413 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
4414 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
4415 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
4416 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
4417 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
4418 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
4419 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
4420 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
4421 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
4422 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
4423 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
4425 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
4426 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
4427 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
4428 `f64::from_str_radix`.
4429 * [Reverse-searching strings is faster with the 'two-way'
4431 * [`std::io::copy` allows `?Sized` arguments][cc].
4432 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
4433 [override `count`, `nth` and `last` with an O(1)
4434 implementation][it].
4435 * [`Default` is implemented for arrays up to `[T; 32]`][d].
4436 * [`IntoRawFd` has been added to the Unix-specific prelude,
4437 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
4439 * [`Extend<String>` and `FromIterator<String` are both implemented for
4441 * [`IntoIterator` is implemented for references to `Option` and
4443 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
4444 Copy`][ext] as part of [RFC 839]. This will cause type inference
4445 breakage in rare situations.
4446 * [`BinaryHeap` implements `Debug`][bh2].
4447 * [`Borrow` and `BorrowMut` are implemented for fixed-size
4449 * [`extern fn`s with the "Rust" and "C" ABIs implement common
4450 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
4451 * [String comparison is faster][faststr].
4452 * `&mut T` where `T: std::fmt::Write` [also implements
4453 `std::fmt::Write`][mutw].
4454 * [A stable regression in `VecDeque::push_back` and other
4455 capacity-altering methods that caused panics for zero-sized types
4457 * [Function pointers implement traits for up to 12 parameters][fp2].
4462 * The compiler [no longer uses the 'morestack' feature to prevent
4463 stack overflow][mm]. Instead it uses guard pages and stack
4464 probes (though stack probes are not yet implemented on any platform
4466 * [The compiler matches traits faster when projections are involved][p].
4467 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
4469 * [Cargo now displays useful information about what its doing during
4470 `cargo update`][cu].
4472 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
4473 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
4474 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
4475 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
4476 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
4477 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
4478 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
4479 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
4480 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
4481 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
4482 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
4483 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
4484 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
4485 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
4486 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
4487 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
4488 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
4489 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
4490 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4491 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4492 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4493 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4494 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
4495 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
4496 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
4497 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
4498 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
4499 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
4500 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
4501 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
4502 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
4503 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
4504 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
4505 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
4506 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
4507 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
4508 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
4509 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
4510 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
4511 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
4512 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
4513 [bh2]: https://github.com/rust-lang/rust/pull/28156
4514 [binfat]: https://github.com/rust-lang/rust/pull/28270
4515 [bm]: https://github.com/rust-lang/rust/pull/28197
4516 [cc]: https://github.com/rust-lang/rust/pull/27531
4517 [crlf]: https://github.com/rust-lang/rust/pull/28034
4518 [cu]: https://github.com/rust-lang/cargo/pull/1931
4519 [d]: https://github.com/rust-lang/rust/pull/27825
4520 [dep]: https://github.com/rust-lang/rust/pull/28339
4521 [es]: https://github.com/rust-lang/rust/pull/27956
4522 [ext]: https://github.com/rust-lang/rust/pull/28094
4523 [faststr]: https://github.com/rust-lang/rust/pull/28338
4524 [ffi]: https://github.com/rust-lang/rust/pull/28779
4525 [fp]: https://github.com/rust-lang/rust/pull/28268
4526 [fp2]: https://github.com/rust-lang/rust/pull/28560
4527 [fp3]: https://github.com/rust-lang/rust/pull/27307
4528 [i]: https://github.com/rust-lang/rust/pull/27451
4529 [into2]: https://github.com/rust-lang/rust/pull/28039
4530 [it]: https://github.com/rust-lang/rust/pull/27652
4531 [mm]: https://github.com/rust-lang/rust/pull/27338
4532 [mutw]: https://github.com/rust-lang/rust/pull/28368
4533 [sound]: https://github.com/rust-lang/rust/pull/27641
4534 [p]: https://github.com/rust-lang/rust/pull/27866
4535 [pec]: https://github.com/rust-lang/rust/pull/28486
4536 [pr]: https://github.com/rust-lang/rust/pull/27896
4537 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4538 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4539 [s]: https://github.com/rust-lang/rust/pull/27474
4540 [stab]: https://github.com/rust-lang/rust/pull/28339
4541 [stat]: https://github.com/rust-lang/rust/pull/28321
4542 [vd]: https://github.com/rust-lang/rust/pull/28494
4544 Version 1.3.0 (2015-09-17)
4545 ==============================
4547 * ~900 changes, numerous bugfixes
4552 * The [new object lifetime defaults][nold] have been [turned
4553 on][nold2] after a cycle of warnings about the change. Now types
4554 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
4555 being interpreted as `&'a Box<Trait+'a>` to `&'a
4556 Box<Trait+'static>`.
4557 * [The Rustonomicon][nom] is a new book in the official documentation
4558 that dives into writing unsafe Rust.
4559 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
4560 timekeeping is employed by other std APIs, as well as out-of-tree
4566 * The [new object lifetime defaults][nold] have been [turned
4567 on][nold2] after a cycle of warnings about the change.
4568 * There is a known [regression][lr] in how object lifetime elision is
4569 interpreted, the proper solution for which is undetermined.
4570 * The `#[prelude_import]` attribute, an internal implementation
4571 detail, was accidentally stabilized previously. [It has been put
4572 behind the `prelude_import` feature gate][pi]. This change is
4573 believed to break no existing code.
4574 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4575 [more sane for dynamically sized types][dst3]. Code that relied on
4576 the previous behavior is thought to be broken.
4577 * The `dropck` rules, which checks that destructors can't access
4578 destroyed values, [have been updated][dropck] to match the
4579 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4580 cause some previously-compiling code to no longer build.
4585 * The [new object lifetime defaults][nold] have been [turned
4586 on][nold2] after a cycle of warnings about the change.
4587 * Semicolons may [now follow types and paths in
4588 macros](https://github.com/rust-lang/rust/pull/27000).
4589 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4590 [more sane for dynamically sized types][dst3]. Code that relied on
4591 the previous behavior is not known to exist, and suspected to be
4593 * `'static` variables [may now be recursive][st].
4594 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4595 implementations correctly.
4596 * The `dropck` rules, which checks that destructors can't access
4597 destroyed values, [have been updated][dropck] to match the
4603 * The [`Duration`] API, [has been stabilized][ds], as well as the
4604 `std::time` module, which presently contains only `Duration`.
4605 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4606 * The owned C string, [`CString`], implements [`Borrow`] and the
4607 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4608 these allow C strings to be borrowed and cloned in generic code.
4609 * [`CStr`] implements [`Debug`].
4610 * [`AtomicPtr`] implements [`Debug`].
4611 * [`Error`] trait objects [can be downcast to their concrete types][e]
4612 in many common configurations, using the [`is`], [`downcast`],
4613 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4615 * Searching for substrings now [employs the two-way algorithm][search]
4616 instead of doing a naive search. This gives major speedups to a
4617 number of methods, including [`contains`][sc], [`find`][sf],
4618 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4619 [`ends_with`][sew] are also faster.
4620 * The performance of `PartialEq` for slices is [much faster][ps].
4621 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4622 is overridden and optimized by the implementations for scalars.
4623 * The [`Hasher`] trait now has a number of specialized `write_*`
4624 methods for primitive types, for efficiency.
4625 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4626 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4627 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4628 of [`std::error::Error::cause`][iec] also delegates to the inner
4630 * [`process::Child`][pc] gained the [`id`] method, which returns a
4631 `u32` representing the platform-specific process identifier.
4632 * The [`connect`] method on slices is deprecated, replaced by the new
4633 [`join`] method (note that both of these are on the *unstable*
4634 [`SliceConcatExt`] trait, but through the magic of the prelude are
4635 available to stable code anyway).
4636 * The [`Div`] operator is implemented for [`Wrapping`] types.
4637 * [`DerefMut` is implemented for `String`][dms].
4638 * Performance of SipHash (the default hasher for `HashMap`) is
4639 [better for long data][sh].
4640 * [`AtomicPtr`] implements [`Send`].
4641 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4642 are now [specialized to use uninitialized buffers for increased
4644 * Lifetime parameters of foreign functions [are now resolved
4650 * Rust can now, with some coercion, [produce programs that run on
4651 Windows XP][xp], though XP is not considered a supported platform.
4652 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4653 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4654 recommended for use in 1.3, though should be fully-functional
4655 in the [64-bit 1.4 beta][b14].
4656 * On Fedora-based systems installation will [properly configure the
4657 dynamic linker][fl].
4658 * The compiler gained many new extended error descriptions, which can
4659 be accessed with the `--explain` flag.
4660 * The `dropck` pass, which checks that destructors can't access
4661 destroyed values, [has been rewritten][dropck]. This fixes some
4662 soundness holes, and as such will cause some previously-compiling
4663 code to no longer build.
4664 * `rustc` now uses [LLVM to write archive files where possible][ar].
4665 Eventually this will eliminate the compiler's dependency on the ar
4667 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4668 supported FreeBSD on x86_64).
4669 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4670 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4672 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4673 will kill the process instead of leaking][nlp].
4675 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4676 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4677 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4678 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4679 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4680 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4681 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4682 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4683 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4684 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4685 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4686 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4687 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4688 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4689 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4690 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4691 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4692 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4693 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4694 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4695 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4696 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4697 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4698 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4699 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4700 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4701 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4702 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4703 [ar]: https://github.com/rust-lang/rust/pull/26926
4704 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4705 [dms]: https://github.com/rust-lang/rust/pull/26241
4706 [dropck]: https://github.com/rust-lang/rust/pull/27261
4707 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4708 [ds]: https://github.com/rust-lang/rust/pull/26818
4709 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4710 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4711 [dst3]: https://github.com/rust-lang/rust/pull/27351
4712 [e]: https://github.com/rust-lang/rust/pull/24793
4713 [f]: https://github.com/rust-lang/rust/pull/26588
4714 [fb]: https://github.com/rust-lang/rust/pull/26959
4715 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4716 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4717 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4718 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4719 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4720 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4721 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4722 [lic]: https://github.com/rust-lang/rust/pull/26583
4723 [lnu]: https://github.com/rust-lang/rust/pull/27026
4724 [lr]: https://github.com/rust-lang/rust/issues/27248
4725 [lum]: https://github.com/rust-lang/rust/pull/26378
4726 [lur]: https://github.com/rust-lang/rust/pull/26783
4727 [nlp]: https://github.com/rust-lang/rust/pull/27176
4728 [nold2]: https://github.com/rust-lang/rust/pull/27045
4729 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4730 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4731 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4732 [pi]: https://github.com/rust-lang/rust/pull/26699
4733 [ps]: https://github.com/rust-lang/rust/pull/26884
4734 [rte]: https://github.com/rust-lang/rust/pull/26950
4735 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4736 [search]: https://github.com/rust-lang/rust/pull/26327
4737 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4738 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4739 [sh]: https://github.com/rust-lang/rust/pull/27280
4740 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4741 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4742 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4743 [st]: https://github.com/rust-lang/rust/pull/26630
4744 [win1]: https://github.com/rust-lang/rust/pull/26569
4745 [win2]: https://github.com/rust-lang/rust/pull/26741
4746 [win3]: https://github.com/rust-lang/rust/pull/26741
4747 [win4]: https://github.com/rust-lang/rust/pull/27210
4748 [xp]: https://github.com/rust-lang/rust/pull/26569
4750 Version 1.2.0 (2015-08-07)
4751 ==========================
4753 * ~1200 changes, numerous bugfixes
4758 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4759 like `Rc` to contain types without a fixed size, arrays and trait
4760 objects, finally enabling use of `Rc<[T]>` and completing the
4761 implementation of DST.
4762 * [Parallel codegen][parcodegen] is now working again, which can
4763 substantially speed up large builds in debug mode; It also gets
4764 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4765 jobs). It's not enabled by default, but will be "in the near
4766 future". It can be activated with the `-C codegen-units=N` flag to
4768 * This is the first release with [experimental support for linking
4769 with the MSVC linker and lib C on Windows (instead of using the GNU
4770 variants via MinGW)][win]. It is yet recommended only for the most
4771 intrepid Rustaceans.
4772 * Benchmark compilations are showing a 30% improvement in
4773 bootstrapping over 1.1.
4778 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4779 unicode case mapping, which is a previously-planned change in
4780 behavior and considered a bugfix.
4781 * [`mem::align_of`] now specifies [the *minimum alignment* for
4782 T][align], which is usually the alignment programs are interested
4783 in, and the same value reported by clang's
4784 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4786 * [The `#[packed]` attribute is no longer silently accepted by the
4787 compiler][packed]. This attribute did nothing and code that
4788 mentioned it likely did not work as intended.
4789 * Associated type defaults are [now behind the
4790 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4791 defaults *did not work*, but could be mentioned syntactically. As
4792 such this breakage has minimal impact.
4797 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4798 matching against dereferencable values.
4803 * The [`Extend`] trait, which grows a collection from an iterator, is
4804 implemented over iterators of references, for `String`, `Vec`,
4805 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4806 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4807 * The [`iter::once`] function returns an iterator that yields a single
4808 element, and [`iter::empty`] returns an iterator that yields no
4810 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4811 over substring matches.
4812 * [`Cell`] and [`RefCell`] both implement `Eq`.
4813 * A number of methods for wrapping arithmetic are added to the
4814 integral types, [`wrapping_div`], [`wrapping_rem`],
4815 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4816 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4817 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4818 type.. It is illegal for the default arithmetic operations in Rust
4819 to overflow; the desire to wrap must be explicit.
4820 * The `{:#?}` formatting specifier [displays the alternate,
4821 pretty-printed][debugfmt] form of the `Debug` formatter. This
4822 feature was actually introduced prior to 1.0 with little
4824 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4825 for writing data to formatted strings, similar to [`io::Write`].
4826 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4827 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4828 are used by code generators to emit implementations of [`Debug`].
4829 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4830 methods that convert case, following Unicode case mapping.
4831 * It is now easier to handle poisoned locks. The [`PoisonError`]
4832 type, returned by failing lock operations, exposes `into_inner`,
4833 `get_ref`, and `get_mut`, which all give access to the inner lock
4834 guard, and allow the poisoned lock to continue to operate. The
4835 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4836 poisoned lock without attempting to take the lock.
4837 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4838 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4839 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4840 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4842 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4848 * `rustc` employs smarter heuristics for guessing at [typos].
4849 * `rustc` emits more efficient code for [no-op conversions between
4850 unsafe pointers][nop].
4851 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4852 resulting in faster compile times and smaller code.
4854 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4855 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4856 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4857 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4858 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4859 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4860 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4861 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4862 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4863 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4864 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4865 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4866 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4867 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4868 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4869 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4870 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4871 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4872 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4873 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4874 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4875 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4876 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4877 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4878 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4879 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4880 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4881 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4882 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4883 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4884 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4885 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4886 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4887 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4888 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4889 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4890 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4891 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4892 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4893 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4894 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4895 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4896 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4897 [align]: https://github.com/rust-lang/rust/pull/25646
4898 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4899 [typos]: https://github.com/rust-lang/rust/pull/26087
4900 [nop]: https://github.com/rust-lang/rust/pull/26336
4901 [fat]: https://github.com/rust-lang/rust/pull/26411
4902 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4903 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4904 [packed]: https://github.com/rust-lang/rust/pull/25541
4905 [ad]: https://github.com/rust-lang/rust/pull/27382
4906 [win]: https://github.com/rust-lang/rust/pull/25350
4908 Version 1.1.0 (2015-06-25)
4909 =========================
4911 * ~850 changes, numerous bugfixes
4916 * The [`std::fs` module has been expanded][fs] to expand the set of
4917 functionality exposed:
4918 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4919 don't incur a syscall on some platforms.
4920 * A `symlink_metadata` function has been added.
4921 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4922 access to all underlying information.
4923 * The compiler now contains extended explanations of many errors. When an error
4924 with an explanation occurs the compiler suggests using the `--explain` flag
4925 to read the explanation. Error explanations are also [available online][err-index].
4926 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4927 well as other work, the time to bootstrap the compiler decreased by
4933 * The [`str::split_whitespace`] method splits a string on unicode
4934 whitespace boundaries.
4935 * On both Windows and Unix, new extension traits provide conversion of
4936 I/O types to and from the underlying system handles. On Unix, these
4937 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4938 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4939 `TcpListener`, and `UpdSocket`. Further implementations for
4940 `std::process` will be stabilized later.
4941 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4942 Windows, symlinks can be created with
4943 `std::os::windows::symlink_dir` and
4944 `std::os::windows::symlink_file`.
4945 * The `mpsc::Receiver` type can now be converted into an iterator with
4946 `into_iter` on the [`IntoIterator`] trait.
4947 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4948 implementation of the [`From`] trait.
4949 * The `Debug` implementation for `RangeFull` [creates output that is
4950 more consistent with other implementations][rf].
4951 * [`Debug` is implemented for `File`][file].
4952 * The `Default` implementation for `Arc` [no longer requires `Sync +
4954 * [The `Iterator` methods `count`, `nth`, and `last` have been
4955 overridden for slices to have O(1) performance instead of O(n)][si].
4956 * Incorrect handling of paths on Windows has been improved in both the
4957 compiler and the standard library.
4958 * [`AtomicPtr` gained a `Default` implementation][ap].
4959 * In accordance with Rust's policy on arithmetic overflow `abs` now
4960 [panics on overflow when debug assertions are enabled][abs].
4961 * The [`Cloned`] iterator, which was accidentally left unstable for
4962 1.0 [has been stabilized][c].
4963 * The [`Incoming`] iterator, which iterates over incoming TCP
4964 connections, and which was accidentally unnamable in 1.0, [is now
4965 properly exported][inc].
4966 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4967 `sift_up` or `sift_down` panic][bh].
4968 * The [`split_off`] method of `LinkedList` [no longer corrupts
4969 the list in certain scenarios][ll].
4974 * Type checking performance [has improved notably][sk] with
4975 [multiple improvements][pre].
4976 * The compiler [suggests code changes][ch] for more errors.
4977 * rustc and it's build system have experimental support for [building
4978 toolchains against MUSL][m] instead of glibc on Linux.
4979 * The compiler defines the `target_env` cfg value, which is used for
4980 distinguishing toolchains that are otherwise for the same
4981 platform. Presently this is set to `gnu` for common GNU Linux
4982 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4983 * The [`cargo rustc`][crc] command invokes a build with custom flags
4985 * [Android executables are always position independent][pie].
4986 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4989 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4990 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4991 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4992 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4993 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4994 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4995 [rf]: https://github.com/rust-lang/rust/pull/24491
4996 [err-index]: https://doc.rust-lang.org/error-index.html
4997 [sk]: https://github.com/rust-lang/rust/pull/24615
4998 [pre]: https://github.com/rust-lang/rust/pull/25323
4999 [file]: https://github.com/rust-lang/rust/pull/24598
5000 [ch]: https://github.com/rust-lang/rust/pull/24683
5001 [arc]: https://github.com/rust-lang/rust/pull/24695
5002 [si]: https://github.com/rust-lang/rust/pull/24701
5003 [ap]: https://github.com/rust-lang/rust/pull/24834
5004 [m]: https://github.com/rust-lang/rust/pull/24777
5005 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5006 [crc]: https://github.com/rust-lang/cargo/pull/1568
5007 [pie]: https://github.com/rust-lang/rust/pull/24953
5008 [abs]: https://github.com/rust-lang/rust/pull/25441
5009 [c]: https://github.com/rust-lang/rust/pull/25496
5010 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5011 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5012 [inc]: https://github.com/rust-lang/rust/pull/25522
5013 [bh]: https://github.com/rust-lang/rust/pull/25856
5014 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5015 [ll]: https://github.com/rust-lang/rust/pull/26022
5016 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5017 [drop]: https://github.com/rust-lang/rust/pull/24935
5019 Version 1.0.0 (2015-05-15)
5020 ========================
5022 * ~1500 changes, numerous bugfixes
5027 * The vast majority of the standard library is now `#[stable]`. It is
5028 no longer possible to use unstable features with a stable build of
5030 * Many popular crates on [crates.io] now work on the stable release
5032 * Arithmetic on basic integer types now [checks for overflow in debug
5038 * Several [restrictions have been added to trait coherence][coh] in
5039 order to make it easier for upstream authors to change traits
5040 without breaking downstream code.
5041 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5042 improve error messages and macro behavior. For example, `0b1234` is
5043 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5044 * Trait bounds [are always invariant][inv], eliminating the need for
5045 the `PhantomFn` and `MarkerTrait` lang items, which have been
5047 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5048 "foo" as bar` syntax has been replaced with `extern crate foo as
5049 bar`, and Cargo now automatically translates "-" in *package* names
5050 to underscore for the crate name.
5051 * [Lifetime shadowing is an error][lt].
5052 * [`Send` no longer implies `'static`][send-rfc].
5053 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5054 `MyType::default()`.
5055 * Primitive types [now have inherent methods][prim-inherent],
5056 obviating the need for extension traits like `SliceExt`.
5057 * Methods with `Self: Sized` in their `where` clause are [considered
5058 object-safe][self-sized], allowing many extension traits like
5059 `IteratorExt` to be merged into the traits they extended.
5060 * You can now [refer to associated types][assoc-where] whose
5061 corresponding trait bounds appear only in a `where` clause.
5062 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5063 like `Send` and `Sync` are now library-defined.
5064 * A [Reflect trait][reflect] was introduced, which means that
5065 downcasting via the `Any` trait is effectively limited to concrete
5066 types. This helps retain the potentially-important "parametricity"
5067 property: generic code cannot behave differently for different type
5068 arguments except in minor ways.
5069 * The `unsafe_destructor` feature is now deprecated in favor of the
5070 [new `dropck`][dropck]. This change is a major reduction in unsafe
5076 * The `thread_local` module [has been renamed to `std::thread`][th].
5077 * The methods of `IteratorExt` [have been moved to the `Iterator`
5079 * Several traits that implement Rust's conventions for type
5080 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5081 [centralized in the `std::convert` module][con].
5082 * The `FromError` trait [was removed in favor of `From`][fe].
5083 * The basic sleep function [has moved to
5084 `std::thread::sleep_ms`][slp].
5085 * The `splitn` function now takes an `n` parameter that represents the
5086 number of items yielded by the returned iterator [instead of the
5087 number of 'splits'][spl].
5088 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5089 * [Derived implementations of `PartialOrd` now order enums according
5090 to their explicitly-assigned discriminants][po].
5091 * [Methods for searching strings are generic over `Pattern`s][pat],
5092 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5094 * [In method resolution, object methods are resolved before inherent
5096 * [`String::from_str` has been deprecated in favor of the `From` impl,
5097 `String::from`][sf].
5098 * [`io::Error` implements `Sync`][ios].
5099 * [The `words` method on `&str` has been replaced with
5100 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5102 * The new path and IO modules are complete and `#[stable]`. This
5103 was the major library focus for this cycle.
5104 * The path API was [revised][path-normalize] to normalize `.`,
5105 adjusting the tradeoffs in favor of the most common usage.
5106 * A large number of remaining APIs in `std` were also stabilized
5107 during this cycle; about 75% of the non-deprecated API surface
5109 * The new [string pattern API][string-pattern] landed, which makes
5110 the string slice API much more internally consistent and flexible.
5111 * A new set of [generic conversion traits][conversion] replaced
5112 many existing ad hoc traits.
5113 * Generic numeric traits were [completely removed][num-traits]. This
5114 was made possible thanks to inherent methods for primitive types,
5115 and the removal gives maximal flexibility for designing a numeric
5116 hierarchy in the future.
5117 * The `Fn` traits are now related via [inheritance][fn-inherit]
5118 and provide ergonomic [blanket implementations][fn-blanket].
5119 * The `Index` and `IndexMut` traits were changed to
5120 [take the index by value][index-value], enabling code like
5121 `hash_map["string"]` to work.
5122 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5123 `Copy` data is known to be `Clone` as well.
5128 * Many errors now have extended explanations that can be accessed with
5129 the `--explain` flag to `rustc`.
5130 * Many new examples have been added to the standard library
5132 * rustdoc has received a number of improvements focused on completion
5134 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5135 * Much headway was made on ecosystem-wide CI, making it possible
5136 to [compare builds for breakage][ci-compare].
5139 [crates.io]: http://crates.io
5140 [clo]: https://github.com/rust-lang/rust/pull/24034
5141 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5142 [con]: https://github.com/rust-lang/rust/pull/23875
5143 [cr]: https://github.com/rust-lang/rust/pull/23419
5144 [fe]: https://github.com/rust-lang/rust/pull/23879
5145 [ie]: https://github.com/rust-lang/rust/pull/23300
5146 [inv]: https://github.com/rust-lang/rust/pull/23938
5147 [ios]: https://github.com/rust-lang/rust/pull/24133
5148 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5149 [lt]: https://github.com/rust-lang/rust/pull/24057
5150 [meth]: https://github.com/rust-lang/rust/pull/24056
5151 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5152 [po]: https://github.com/rust-lang/rust/pull/24270
5153 [sf]: https://github.com/rust-lang/rust/pull/24517
5154 [slp]: https://github.com/rust-lang/rust/pull/23949
5155 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5156 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5157 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5158 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5159 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5160 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5161 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5162 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5163 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5164 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5165 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5166 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5167 [reflect]: https://github.com/rust-lang/rust/pull/23712
5168 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5169 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5170 [index-value]: https://github.com/rust-lang/rust/pull/23601
5171 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5172 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5173 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5174 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5175 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5176 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5179 Version 1.0.0-alpha.2 (2015-02-20)
5180 =====================================
5182 * ~1300 changes, numerous bugfixes
5186 * The various I/O modules were [overhauled][io-rfc] to reduce
5187 unnecessary abstractions and provide better interoperation with
5188 the underlying platform. The old `io` module remains temporarily
5190 * The standard library now [participates in feature gating][feat],
5191 so use of unstable libraries now requires a `#![feature(...)]`
5192 attribute. The impact of this change is [described on the
5193 forum][feat-forum]. [RFC][feat-rfc].
5197 * `for` loops [now operate on the `IntoIterator` trait][into],
5198 which eliminates the need to call `.iter()`, etc. to iterate
5199 over collections. There are some new subtleties to remember
5200 though regarding what sort of iterators various types yield, in
5201 particular that `for foo in bar { }` yields values from a move
5202 iterator, destroying the original collection. [RFC][into-rfc].
5203 * Objects now have [default lifetime bounds][obj], so you don't
5204 have to write `Box<Trait+'static>` when you don't care about
5205 storing references. [RFC][obj-rfc].
5206 * In types that implement `Drop`, [lifetimes must outlive the
5207 value][drop]. This will soon make it possible to safely
5208 implement `Drop` for types where `#[unsafe_destructor]` is now
5209 required. Read the [gorgeous RFC][drop-rfc] for details.
5210 * The fully qualified <T as Trait>::X syntax lets you set the Self
5211 type for a trait method or associated type. [RFC][ufcs-rfc].
5212 * References to types that implement `Deref<U>` now [automatically
5213 coerce to references][deref] to the dereferenced type `U`,
5214 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5215 should eliminate many unsightly uses of `&*`, as when converting
5216 from references to vectors into references to
5217 slices. [RFC][deref-rfc].
5218 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5219 `|:|`) is obsolete and closure kind is inferred from context.
5220 * [`Self` is a keyword][Self].
5224 * The `Show` and `String` formatting traits [have been
5225 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5226 their related purposes. Automatically getting a string
5227 conversion to use with `format!("{:?}", something_to_debug)` is
5228 now written `#[derive(Debug)]`.
5229 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5230 OsStr}`, provide strings in platform-specific encodings for easier
5231 interop with system APIs. [RFC][osstr-rfc].
5232 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5233 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5234 creating raw pointers.
5238 * Certain long error messages of the form 'expected foo found bar'
5239 are now [split neatly across multiple
5240 lines][multiline]. Examples in the PR.
5241 * On Unix Rust can be [uninstalled][un] by running
5242 `/usr/local/lib/rustlib/uninstall.sh`.
5243 * The `#[rustc_on_unimplemented]` attribute, requiring the
5244 'on_unimplemented' feature, lets rustc [display custom error
5245 messages when a trait is expected to be implemented for a type
5250 * Rust is tested against a [LALR grammar][lalr], which parses
5251 almost all the Rust files that rustc does.
5253 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5254 [close]: https://github.com/rust-lang/rust/pull/21843
5255 [deref]: https://github.com/rust-lang/rust/pull/21351
5256 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5257 [drop]: https://github.com/rust-lang/rust/pull/21972
5258 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5259 [feat]: https://github.com/rust-lang/rust/pull/21248
5260 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5261 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5262 [fmt]: https://github.com/rust-lang/rust/pull/21457
5263 [into]: https://github.com/rust-lang/rust/pull/20790
5264 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5265 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5266 [lalr]: https://github.com/rust-lang/rust/pull/21452
5267 [multiline]: https://github.com/rust-lang/rust/pull/19870
5268 [obj]: https://github.com/rust-lang/rust/pull/22230
5269 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5270 [onun]: https://github.com/rust-lang/rust/pull/20889
5271 [osstr]: https://github.com/rust-lang/rust/pull/21488
5272 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5273 [Self]: https://github.com/rust-lang/rust/pull/22158
5274 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5275 [un]: https://github.com/rust-lang/rust/pull/22256
5278 Version 1.0.0-alpha (2015-01-09)
5279 ==================================
5281 * ~2400 changes, numerous bugfixes
5285 * The language itself is considered feature complete for 1.0,
5286 though there will be many usability improvements and bugfixes
5287 before the final release.
5288 * Nearly 50% of the public API surface of the standard library has
5289 been declared 'stable'. Those interfaces are unlikely to change
5291 * The long-running debate over integer types has been
5292 [settled][ints]: Rust will ship with types named `isize` and
5293 `usize`, rather than `int` and `uint`, for pointer-sized
5294 integers. Guidelines will be rolled out during the alpha cycle.
5295 * Most crates that are not `std` have been moved out of the Rust
5296 distribution into the Cargo ecosystem so they can evolve
5297 separately and don't need to be stabilized as quickly, including
5298 'time', 'getopts', 'num', 'regex', and 'term'.
5299 * Documentation continues to be expanded with more API coverage, more
5300 examples, and more in-depth explanations. The guides have been
5301 consolidated into [The Rust Programming Language][trpl].
5302 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5303 * All official Rust binary installers now come with [Cargo], the
5304 Rust package manager.
5308 * Closures have been [completely redesigned][unboxed] to be
5309 implemented in terms of traits, can now be used as generic type
5310 bounds and thus monomorphized and inlined, or via an opaque
5311 pointer (boxed) as in the old system. The new system is often
5312 referred to as 'unboxed' closures.
5313 * Traits now support [associated types][assoc], allowing families
5314 of related types to be defined together and used generically in
5316 * Enum variants are [namespaced by their type names][enum].
5317 * [`where` clauses][where] provide a more versatile and attractive
5318 syntax for specifying generic bounds, though the previous syntax
5320 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5322 * Rust [no longer has a runtime][rt] of any description, and only
5323 supports OS threads, not green threads.
5324 * At long last, Rust has been overhauled for 'dynamically-sized
5325 types' ([DST]), which integrates 'fat pointers' (object types,
5326 arrays, and `str`) more deeply into the type system, making it
5328 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5329 `..j` that produce range types and which, when combined with the
5330 `Index` operator and multidispatch, leads to a convenient slice
5332 * The new range syntax revealed an ambiguity in the fixed-length
5333 array syntax, so now fixed length arrays [are written `[T;
5335 * The `Copy` trait is no longer implemented automatically. Unsafe
5336 pointers no longer implement `Sync` and `Send` so types
5337 containing them don't automatically either. `Sync` and `Send`
5338 are now 'unsafe traits' so one can "forcibly" implement them via
5339 `unsafe impl` if a type confirms to the requirements for them
5340 even though the internals do not (e.g. structs containing unsafe
5341 pointers like `Arc`). These changes are intended to prevent some
5342 footguns and are collectively known as [opt-in built-in
5343 traits][oibit] (though `Sync` and `Send` will soon become pure
5344 library types unknown to the compiler).
5345 * Operator traits now take their operands [by value][ops], and
5346 comparison traits can use multidispatch to compare one type
5347 against multiple other types, allowing e.g. `String` to be
5348 compared with `&str`.
5349 * `if let` and `while let` are no longer feature-gated.
5350 * Rust has adopted a more [uniform syntax for escaping unicode
5351 characters][unicode].
5352 * `macro_rules!` [has been declared stable][mac]. Though it is a
5353 flawed system it is sufficiently popular that it must be usable
5354 for 1.0. Effort has gone into [future-proofing][mac-future] it
5355 in ways that will allow other macro systems to be developed in
5356 parallel, and won't otherwise impact the evolution of the
5358 * The prelude has been [pared back significantly][prelude] such
5359 that it is the minimum necessary to support the most pervasive
5360 code patterns, and through [generalized where clauses][where]
5361 many of the prelude extension traits have been consolidated.
5362 * Rust's rudimentary reflection [has been removed][refl], as it
5363 incurred too much code generation for little benefit.
5364 * [Struct variants][structvars] are no longer feature-gated.
5365 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5366 known as 'higher-ranked trait bounds', this crucially allows
5367 unboxed closures to work.
5368 * Macros invocations surrounded by parens or square brackets and
5369 not terminated by a semicolon are [parsed as
5370 expressions][macros], which makes expressions like `vec![1i32,
5371 2, 3].len()` work as expected.
5372 * Trait objects now implement their traits automatically, and
5373 traits that can be coerced to objects now must be [object
5375 * Automatically deriving traits is now done with `#[derive(...)]`
5376 not `#[deriving(...)]` for [consistency with other naming
5377 conventions][derive].
5378 * Importing the containing module or enum at the same time as
5379 items or variants they contain is [now done with `self` instead
5380 of `mod`][self], as in use `foo::{self, bar}`
5381 * Glob imports are no longer feature-gated.
5382 * The `box` operator and `box` patterns have been feature-gated
5383 pending a redesign. For now unique boxes should be allocated
5384 like other containers, with `Box::new`.
5388 * A [series][coll1] of [efforts][coll2] to establish
5389 [conventions][coll3] for collections types has resulted in API
5390 improvements throughout the standard library.
5391 * New [APIs for error handling][err] provide ergonomic interop
5392 between error types, and [new conventions][err-conv] describe
5393 more clearly the recommended error handling strategies in Rust.
5394 * The `fail!` macro has been renamed to [`panic!`][panic] so that
5395 it is easier to discuss failure in the context of error handling
5396 without making clarifications as to whether you are referring to
5397 the 'fail' macro or failure more generally.
5398 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
5399 syscall when available.
5400 * The 'serialize' crate has been renamed 'rustc-serialize' and
5401 moved out of the distribution to Cargo. Although it is widely
5402 used now, it is expected to be superseded in the near future.
5403 * The `Show` formatter, typically implemented with
5404 `#[derive(Show)]` is [now requested with the `{:?}`
5405 specifier][show] and is intended for use by all types, for uses
5406 such as `println!` debugging. The new `String` formatter must be
5407 implemented by hand, uses the `{}` specifier, and is intended
5408 for full-fidelity conversions of things that can logically be
5409 represented as strings.
5413 * [Flexible target specification][flex] allows rustc's code
5414 generation to be configured to support otherwise-unsupported
5416 * Rust comes with rust-gdb and rust-lldb scripts that launch their
5417 respective debuggers with Rust-appropriate pretty-printing.
5418 * The Windows installation of Rust is distributed with the
5419 MinGW components currently required to link binaries on that
5424 * Nullable enum optimizations have been extended to more types so
5425 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
5426 space than the inner types themselves.
5427 * Work has begun on supporting AArch64.
5429 [Cargo]: https://crates.io
5430 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
5431 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
5432 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
5433 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
5434 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
5435 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
5436 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
5437 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
5438 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
5439 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
5440 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
5441 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
5442 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
5443 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
5444 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
5445 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
5446 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
5447 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
5448 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
5449 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
5450 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
5451 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
5452 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
5453 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
5454 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
5455 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
5456 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
5457 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
5458 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
5459 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
5460 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
5461 [trpl]: https://doc.rust-lang.org/book/index.html
5462 [rbe]: http://rustbyexample.com/
5465 Version 0.12.0 (2014-10-09)
5466 =============================
5468 * ~1900 changes, numerous bugfixes
5472 * The introductory documentation (now called The Rust Guide) has
5473 been completely rewritten, as have a number of supplementary
5475 * Rust's package manager, Cargo, continues to improve and is
5476 sometimes considered to be quite awesome.
5477 * Many API's in `std` have been reviewed and updated for
5478 consistency with the in-development Rust coding
5479 guidelines. The standard library documentation tracks
5480 stabilization progress.
5481 * Minor libraries have been moved out-of-tree to the rust-lang org
5482 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
5483 be installed with Cargo.
5484 * Lifetime elision allows lifetime annotations to be left off of
5485 function declarations in many common scenarios.
5486 * Rust now works on 64-bit Windows.
5489 * Indexing can be overloaded with the `Index` and `IndexMut`
5491 * The `if let` construct takes a branch only if the `let` pattern
5492 matches, currently behind the 'if_let' feature gate.
5493 * 'where clauses', a more flexible syntax for specifying trait
5494 bounds that is more aesthetic, have been added for traits and
5495 free functions. Where clauses will in the future make it
5496 possible to constrain associated types, which would be
5497 impossible with the existing syntax.
5498 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
5499 the 'slicing_syntax' feature gate, and can be overloaded with
5500 the `Slice` or `SliceMut` traits.
5501 * The syntax for matching of sub-slices has been changed to use a
5502 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
5503 consistency with other uses of `..` and to future-proof
5504 potential additional uses of the syntax.
5505 * The syntax for matching inclusive ranges in patterns has changed
5506 from `0..3` to `0...4` to be consistent with the exclusive range
5508 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
5509 c]`) has been put behind the 'advanced_slice_patterns' feature
5510 gate and may be removed in the future.
5511 * Components of tuples and tuple structs can be extracted using
5512 the `value.0` syntax, currently behind the `tuple_indexing`
5514 * The `#[crate_id]` attribute is no longer supported; versioning
5515 is handled by the package manager.
5516 * Renaming crate imports are now written `extern crate foo as bar`
5517 instead of `extern crate bar = foo`.
5518 * Renaming use statements are now written `use foo as bar` instead
5520 * `let` and `match` bindings and argument names in macros are now
5522 * The new, more efficient, closure types ('unboxed closures') have
5523 been added under a feature gate, 'unboxed_closures'. These will
5524 soon replace the existing closure types, once higher-ranked
5525 trait lifetimes are added to the language.
5526 * `move` has been added as a keyword, for indicating closures
5527 that capture by value.
5528 * Mutation and assignment is no longer allowed in pattern guards.
5529 * Generic structs and enums can now have trait bounds.
5530 * The `Share` trait is now called `Sync` to free up the term
5531 'shared' to refer to 'shared reference' (the default reference
5533 * Dynamically-sized types have been mostly implemented,
5534 unifying the behavior of fat-pointer types with the rest of the
5536 * As part of dynamically-sized types, the `Sized` trait has been
5537 introduced, which qualifying types implement by default, and
5538 which type parameters expect by default. To specify that a type
5539 parameter does not need to be sized, write `<Sized? T>`. Most
5540 types are `Sized`, notable exceptions being unsized arrays
5541 (`[T]`) and trait types.
5542 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
5543 * Lifetime bounds can now be applied to type parameters and object
5545 * The old, reference counted GC type, `Gc<T>` which was once
5546 denoted by the `@` sigil, has finally been removed. GC will be
5547 revisited in the future.
5550 * Library documentation has been improved for a number of modules.
5551 * Bit-vectors, collections::bitv has been modernized.
5552 * The url crate is deprecated in favor of
5553 http://github.com/servo/rust-url, which can be installed with
5555 * Most I/O stream types can be cloned and subsequently closed from
5557 * A `std::time::Duration` type has been added for use in I/O
5558 methods that rely on timers, as well as in the 'time' crate's
5559 `Timespec` arithmetic.
5560 * The runtime I/O abstraction layer that enabled the green thread
5561 scheduler to do non-thread-blocking I/O has been removed, along
5562 with the libuv-based implementation employed by the green thread
5563 scheduler. This will greatly simplify the future I/O work.
5564 * `collections::btree` has been rewritten to have a more
5565 idiomatic and efficient design.
5568 * rustdoc output now indicates the stability levels of API's.
5569 * The `--crate-name` flag can specify the name of the crate
5570 being compiled, like `#[crate_name]`.
5571 * The `-C metadata` specifies additional metadata to hash into
5572 symbol names, and `-C extra-filename` specifies additional
5573 information to put into the output filename, for use by the
5574 package manager for versioning.
5575 * debug info generation has continued to improve and should be
5576 more reliable under both gdb and lldb.
5577 * rustc has experimental support for compiling in parallel
5578 using the `-C codegen-units` flag.
5579 * rustc no longer encodes rpath information into binaries by
5583 * Stack usage has been optimized with LLVM lifetime annotations.
5584 * Official Rust binaries on Linux are more compatible with older
5585 kernels and distributions, built on CentOS 5.10.
5588 Version 0.11.0 (2014-07-02)
5589 ==========================
5591 * ~1700 changes, numerous bugfixes
5594 * ~[T] has been removed from the language. This type is superseded by
5596 * ~str has been removed from the language. This type is superseded by
5598 * ~T has been removed from the language. This type is superseded by the
5600 * @T has been removed from the language. This type is superseded by the
5601 standard library's std::gc::Gc<T> type.
5602 * Struct fields are now all private by default.
5603 * Vector indices and shift amounts are both required to be a `uint`
5604 instead of any integral type.
5605 * Byte character, byte string, and raw byte string literals are now all
5606 supported by prefixing the normal literal with a `b`.
5607 * Multiple ABIs are no longer allowed in an ABI string
5608 * The syntax for lifetimes on closures/procedures has been tweaked
5609 slightly: `<'a>|A, B|: 'b + K -> T`
5610 * Floating point modulus has been removed from the language; however it
5611 is still provided by a library implementation.
5612 * Private enum variants are now disallowed.
5613 * The `priv` keyword has been removed from the language.
5614 * A closure can no longer be invoked through a &-pointer.
5615 * The `use foo, bar, baz;` syntax has been removed from the language.
5616 * The transmute intrinsic no longer works on type parameters.
5617 * Statics now allow blocks/items in their definition.
5618 * Trait bounds are separated from objects with + instead of : now.
5619 * Objects can no longer be read while they are mutably borrowed.
5620 * The address of a static is now marked as insignificant unless the
5621 #[inline(never)] attribute is placed it.
5622 * The #[unsafe_destructor] attribute is now behind a feature gate.
5623 * Struct literals are no longer allowed in ambiguous positions such as
5624 if, while, match, and for..in.
5625 * Declaration of lang items and intrinsics are now feature-gated by
5627 * Integral literals no longer default to `int`, and floating point
5628 literals no longer default to `f64`. Literals must be suffixed with an
5629 appropriate type if inference cannot determine the type of the
5631 * The Box<T> type is no longer implicitly borrowed to &mut T.
5632 * Procedures are now required to not capture borrowed references.
5635 * The standard library is now a "facade" over a number of underlying
5636 libraries. This means that development on the standard library should
5637 be speedier due to smaller crates, as well as a clearer line between
5639 * A new library, libcore, lives under the standard library's facade
5640 which is Rust's "0-assumption" library, suitable for embedded and
5641 kernel development for example.
5642 * A regex crate has been added to the standard distribution. This crate
5643 includes statically compiled regular expressions.
5644 * The unwrap/unwrap_err methods on Result require a Show bound for
5645 better error messages.
5646 * The return types of the std::comm primitives have been centralized
5647 around the Result type.
5648 * A number of I/O primitives have gained the ability to time out their
5650 * A number of I/O primitives have gained the ability to close their
5651 reading/writing halves to cancel pending operations.
5652 * Reverse iterator methods have been removed in favor of `rev()` on
5653 their forward-iteration counterparts.
5654 * A bitflags! macro has been added to enable easy interop with C and
5655 management of bit flags.
5656 * A debug_assert! macro is now provided which is disabled when
5657 `--cfg ndebug` is passed to the compiler.
5658 * A graphviz crate has been added for creating .dot files.
5659 * The std::cast module has been migrated into std::mem.
5660 * The std::local_data api has been migrated from freestanding functions
5661 to being based on methods.
5662 * The Pod trait has been renamed to Copy.
5663 * jemalloc has been added as the default allocator for types.
5664 * The API for allocating memory has been changed to use proper alignment
5665 and sized deallocation
5666 * Connecting a TcpStream or binding a TcpListener is now based on a
5667 string address and a u16 port. This allows connecting to a hostname as
5669 * The Reader trait now contains a core method, read_at_least(), which
5670 correctly handles many repeated 0-length reads.
5671 * The process-spawning API is now centered around a builder-style
5673 * The :? printing qualifier has been moved from the standard library to
5674 an external libdebug crate.
5675 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5676 have been renamed to Eq/Ord.
5677 * The select/plural methods have been removed from format!. The escapes
5678 for { and } have also changed from \{ and \} to {{ and }},
5680 * The TaskBuilder API has been re-worked to be a true builder, and
5681 extension traits for spawning native/green tasks have been added.
5684 * All breaking changes to the language or libraries now have their
5685 commit message annotated with `[breaking-change]` to allow for easy
5686 discovery of breaking changes.
5687 * The compiler will now try to suggest how to annotate lifetimes if a
5688 lifetime-related error occurs.
5689 * Debug info continues to be improved greatly with general bug fixes and
5690 better support for situations like link time optimization (LTO).
5691 * Usage of syntax extensions when cross-compiling has been fixed.
5692 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5693 -fdata-sections and --gc-sections has been enabled by default
5694 * The compiler is now stricter about where it will load module files
5695 from when a module is declared via `mod foo;`.
5696 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5697 Syntax extensions are now discovered via a "plugin registrar" type
5698 which will be extended in the future to other various plugins.
5699 * Lints have been restructured to allow for dynamically loadable lints.
5700 * A number of rustdoc improvements:
5701 * The HTML output has been visually redesigned.
5702 * Markdown is now powered by hoedown instead of sundown.
5703 * Searching heuristics have been greatly improved.
5704 * The search index has been reduced in size by a great amount.
5705 * Cross-crate documentation via `pub use` has been greatly improved.
5706 * Primitive types are now hyperlinked and documented.
5707 * Documentation has been moved from static.rust-lang.org/doc to
5709 * A new sandbox, play.rust-lang.org, is available for running and
5710 sharing rust code examples on-line.
5711 * Unused attributes are now more robustly warned about.
5712 * The dead_code lint now warns about unused struct fields.
5713 * Cross-compiling to iOS is now supported.
5714 * Cross-compiling to mipsel is now supported.
5715 * Stability attributes are now inherited by default and no longer apply
5716 to intra-crate usage, only inter-crate usage.
5717 * Error message related to non-exhaustive match expressions have been
5721 Version 0.10 (2014-04-03)
5722 =========================
5724 * ~1500 changes, numerous bugfixes
5727 * A new RFC process is now in place for modifying the language.
5728 * Patterns with `@`-pointers have been removed from the language.
5729 * Patterns with unique vectors (`~[T]`) have been removed from the
5731 * Patterns with unique strings (`~str`) have been removed from the
5733 * `@str` has been removed from the language.
5734 * `@[T]` has been removed from the language.
5735 * `@self` has been removed from the language.
5736 * `@Trait` has been removed from the language.
5737 * Headers on `~` allocations which contain `@` boxes inside the type for
5738 reference counting have been removed.
5739 * The semantics around the lifetimes of temporary expressions have changed,
5740 see #3511 and #11585 for more information.
5741 * Cross-crate syntax extensions are now possible, but feature gated. See
5742 #11151 for more information. This includes both `macro_rules!` macros as
5743 well as syntax extensions such as `format!`.
5744 * New lint modes have been added, and older ones have been turned on to be
5746 * Unnecessary parentheses
5749 * Uppercase variables
5750 * Publicly visible private types
5751 * `#[deriving]` with raw pointers
5752 * Unsafe functions can no longer be coerced to closures.
5753 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5754 * The `#[simd]` attribute is now behind a feature gate.
5755 * Visibility is no longer allowed on `extern crate` statements, and
5756 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5757 * Trailing commas are now allowed in argument lists and tuple patterns.
5758 * The `do` keyword has been removed, it is now a reserved keyword.
5759 * Default type parameters have been implemented, but are feature gated.
5760 * Borrowed variables through captures in closures are now considered soundly.
5761 * `extern mod` is now `extern crate`
5762 * The `Freeze` trait has been removed.
5763 * The `Share` trait has been added for types that can be shared among
5765 * Labels in macros are now hygienic.
5766 * Expression/statement macro invocations can be delimited with `{}` now.
5767 * Treatment of types allowed in `static mut` locations has been tweaked.
5768 * The `*` and `.` operators are now overloadable through the `Deref` and
5770 * `~Trait` and `proc` no longer have `Send` bounds by default.
5771 * Partial type hints are now supported with the `_` type marker.
5772 * An `Unsafe` type was introduced for interior mutability. It is now
5773 considered undefined to transmute from `&T` to `&mut T` without using the
5775 * The #[linkage] attribute was implemented for extern statics/functions.
5776 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5777 * `Pod` was renamed to `Copy`.
5780 * The `libextra` library has been removed. It has now been decomposed into
5781 component libraries with smaller and more focused nuggets of
5782 functionality. The full list of libraries can be found on the
5783 documentation index page.
5784 * std: `std::condition` has been removed. All I/O errors are now propagated
5785 through the `Result` type. In order to assist with error handling, a
5786 `try!` macro for unwrapping errors with an early return and a lint for
5787 unused results has been added. See #12039 for more information.
5788 * std: The `vec` module has been renamed to `slice`.
5789 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5790 This will become the only growable vector in the future.
5791 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5792 are now found at `std::io::BufferedReader` instead of
5793 `std::io::buffered::BufferedReader`.
5794 * std: `print` and `println` are no longer in the prelude, the `print!` and
5795 `println!` macros are intended to be used instead.
5796 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5797 attempts to statically prevent cycles.
5798 * std: The standard distribution is adopting the policy of pushing failure
5799 to the user rather than failing in libraries. Many functions (such as
5800 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5801 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5802 deriving mode: `#[deriving(Show)]`.
5803 * std: `ToStr` is now implemented for all types implementing `Show`.
5804 * std: The formatting trait methods now take `&self` instead of `&T`
5805 * std: The `invert()` method on iterators has been renamed to `rev()`
5806 * std: `std::num` has seen a reduction in the genericity of its traits,
5807 consolidating functionality into a few core traits.
5808 * std: Backtraces are now printed on task failure if the environment
5809 variable `RUST_BACKTRACE` is present.
5810 * std: Naming conventions for iterators have been standardized. More details
5811 can be found on the wiki's style guide.
5812 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5813 still implement the function.
5814 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5815 * std: `assert_approx_eq!` has been removed
5816 * std: The `e` and `E` formatting specifiers for floats have been added to
5817 print them in exponential notation.
5818 * std: The `Times` trait has been removed
5819 * std: Indications of variance and opting out of builtin bounds is done
5820 through marker types in `std::kinds::marker` now
5821 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5822 `#[deriving(Hash)]` is now possible.
5823 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5824 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5825 * std: `Chan::new` is now `channel()`.
5826 * std: A new synchronous channel type has been implemented.
5827 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5828 * std: `hashmap` and `trie` have been moved to `libcollections`
5829 * std: `run` has been rolled into `io::process`
5830 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5831 * std: The equality and comparison traits have seen some reorganization.
5832 * std: `rand` has moved to `librand`.
5833 * std: `to_{lower,upper}case` has been implemented for `char`.
5834 * std: Logging has been moved to `liblog`.
5835 * collections: `HashMap` has been rewritten for higher performance and less
5837 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5838 it can be booted manually. The runtime guide has more information and
5840 * native: All I/O functionality except signals has been implemented.
5841 * green: Task spawning with `libgreen` has been optimized with stack caching
5842 and various trimming of code.
5843 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5844 * sync: The `extra::sync` module has been updated to modern rust (and moved
5845 to the `sync` library), tweaking and improving various interfaces while
5846 dropping redundant functionality.
5847 * sync: A new `Barrier` type has been added to the `sync` library.
5848 * sync: An efficient mutex for native and green tasks has been implemented.
5849 * serialize: The `base64` module has seen some improvement. It treats
5850 newlines better, has non-string error values, and has seen general
5852 * fourcc: A `fourcc!` macro was introduced
5853 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5854 hexadecimal literal.
5857 * `rustpkg` has been deprecated and removed from the main repository. Its
5858 replacement, `cargo`, is under development.
5859 * Nightly builds of rust are now available
5860 * The memory usage of rustc has been improved many times throughout this
5862 * The build process supports disabling rpath support for the rustc binary
5864 * Code generation has improved in some cases, giving more information to the
5865 LLVM optimization passes to enable more extensive optimizations.
5866 * Debuginfo compatibility with lldb on OSX has been restored.
5867 * The master branch is now gated on an android bot, making building for
5868 android much more reliable.
5869 * Output flags have been centralized into one `--emit` flag.
5870 * Crate type flags have been centralized into one `--crate-type` flag.
5871 * Codegen flags have been consolidated behind a `-C` flag.
5872 * Linking against outdated crates now has improved error messages.
5873 * Error messages with lifetimes will often suggest how to annotate the
5874 function to fix the error.
5875 * Many more types are documented in the standard library, and new guides
5877 * Many `rustdoc` improvements:
5878 * code blocks are syntax highlighted.
5879 * render standalone markdown files.
5880 * the --test flag tests all code blocks by default.
5881 * exported macros are displayed.
5882 * re-exported types have their documentation inlined at the location of the
5884 * search works across crates that have been rendered to the same output
5888 Version 0.9 (2014-01-09)
5889 ==========================
5891 * ~1800 changes, numerous bugfixes
5894 * The `float` type has been removed. Use `f32` or `f64` instead.
5895 * A new facility for enabling experimental features (feature gating) has
5896 been added, using the crate-level `#[feature(foo)]` attribute.
5897 * Managed boxes (@) are now behind a feature gate
5898 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5899 standard library's `Gc` or `Rc` types instead.
5900 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5901 * Jumping back to the top of a loop is now done with `continue` instead of
5903 * Strings can no longer be mutated through index assignment.
5904 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5905 hash delimiters, as in `r###"foo"###`.
5906 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5908 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5909 * `@fn`s have been removed.
5910 * `do` only works with procs in order to make it obvious what the cost
5912 * Single-element tuple-like structs can no longer be dereferenced to
5913 obtain the inner value. A more comprehensive solution for overloading
5914 the dereference operator will be provided in the future.
5915 * The `#[link(...)]` attribute has been replaced with
5916 `#[crate_id = "name#vers"]`.
5917 * Empty `impl`s must be terminated with empty braces and may not be
5918 terminated with a semicolon.
5919 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5920 no longer has any special meaning.
5921 * The old `fmt!` string formatting macro has been removed.
5922 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5923 `print!` and `println!`.
5924 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5925 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5926 `extern mod foo = "bar"` instead.
5927 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5928 * Macros can have attributes.
5929 * Macros can expand to items with attributes.
5930 * Macros can expand to multiple items.
5931 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5932 * Comments may be nested.
5933 * Values automatically coerce to trait objects they implement, without
5935 * Enum discriminants are no longer an entire word but as small as needed to
5936 contain all the variants. The `repr` attribute can be used to override
5937 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5938 `#[repr(C)]` to match C enums.
5939 * Non-string literals are not allowed in attributes (they never worked).
5940 * The FFI now supports variadic functions.
5941 * Octal numeric literals, as in `0o7777`.
5942 * The `concat!` syntax extension performs compile-time string concatenation.
5943 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5944 removed as Rust no longer uses segmented stacks.
5945 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5946 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5947 not `*`; ignoring remaining fields of a struct is also done with `..`,
5948 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5949 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5950 * `rustc` supports the "system" calling convention, which defaults to the
5951 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5953 * The `type_overflow` lint (default: warn) checks literals for overflow.
5954 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5955 * The `attribute_usage` lint (default: warn) warns about unknown
5957 * The `unknown_features` lint (default: warn) warns about unknown
5959 * The `dead_code` lint (default: warn) checks for dead code.
5960 * Rust libraries can be linked statically to one another
5961 * `#[link_args]` is behind the `link_args` feature gate.
5962 * Native libraries are now linked with `#[link(name = "foo")]`
5963 * Native libraries can be statically linked to a rust crate
5964 (`#[link(name = "foo", kind = "static")]`).
5965 * Native OS X frameworks are now officially supported
5966 (`#[link(name = "foo", kind = "framework")]`).
5967 * The `#[thread_local]` attribute creates thread-local (not task-local)
5968 variables. Currently behind the `thread_local` feature gate.
5969 * The `return` keyword may be used in closures.
5970 * Types that can be copied via a memcpy implement the `Pod` kind.
5971 * The `cfg` attribute can now be used on struct fields and enum variants.
5974 * std: The `option` and `result` API's have been overhauled to make them
5975 simpler, more consistent, and more composable.
5976 * std: The entire `std::io` module has been replaced with one that is
5977 more comprehensive and that properly interfaces with the underlying
5978 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5980 * std: `io::util` contains a number of useful implementations of
5981 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5982 `ZeroReader`, `TeeReader`.
5983 * std: The reference counted pointer type `extra::rc` moved into std.
5984 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5985 just a wrapper around it).
5986 * std: The `Either` type has been removed.
5987 * std: `fmt::Default` can be implemented for any type to provide default
5988 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5989 * std: The `rand` API continues to be tweaked.
5990 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5991 on failure in gdb, is now named `rust_fail`.
5992 * std: The `each_key` and `each_value` methods on `HashMap` have been
5993 replaced by the `keys` and `values` iterators.
5994 * std: Functions dealing with type size and alignment have moved from the
5995 `sys` module to the `mem` module.
5996 * std: The `path` module was written and API changed.
5997 * std: `str::from_utf8` has been changed to cast instead of allocate.
5998 * std: `starts_with` and `ends_with` methods added to vectors via the
5999 `ImmutableEqVector` trait, which is in the prelude.
6000 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6001 if the index is out of bounds.
6002 * std: Task failure no longer propagates between tasks, as the model was
6003 complex, expensive, and incompatible with thread-based tasks.
6004 * std: The `Any` type can be used for dynamic typing.
6005 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6007 * std: Methods that produce iterators generally do not have an `_iter`
6009 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6010 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6011 * std: `util::ignore` renamed to `prelude::drop`.
6012 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6014 * std: `vec::raw` has seen a lot of cleanup and API changes.
6015 * std: The standard library no longer includes any C++ code, and very
6016 minimal C, eliminating the dependency on libstdc++.
6017 * std: Runtime scheduling and I/O functionality has been factored out into
6018 extensible interfaces and is now implemented by two different crates:
6019 libnative, for native threading and I/O; and libgreen, for green threading
6020 and I/O. This paves the way for using the standard library in more limited
6021 embedded environments.
6022 * std: The `comm` module has been rewritten to be much faster, have a
6023 simpler, more consistent API, and to work for both native and green
6025 * std: All libuv dependencies have been moved into the rustuv crate.
6026 * native: New implementations of runtime scheduling on top of OS threads.
6027 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6029 * green: The green thread scheduler and message passing types are almost
6031 * extra: The `flatpipes` module had bitrotted and was removed.
6032 * extra: All crypto functions have been removed and Rust now has a policy of
6033 not reimplementing crypto in the standard library. In the future crypto
6034 will be provided by external crates with bindings to established libraries.
6035 * extra: `c_vec` has been modernized.
6036 * extra: The `sort` module has been removed. Use the `sort` method on
6040 * The `rust` and `rusti` commands have been removed, due to lack of
6042 * `rustdoc` was completely rewritten.
6043 * `rustdoc` can test code examples in documentation.
6044 * `rustpkg` can test packages with the argument, 'test'.
6045 * `rustpkg` supports arbitrary dependencies, including C libraries.
6046 * `rustc`'s support for generating debug info is improved again.
6047 * `rustc` has better error reporting for unbalanced delimiters.
6048 * `rustc`'s JIT support was removed due to bitrot.
6049 * Executables and static libraries can be built with LTO (-Z lto)
6050 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6054 Version 0.8 (2013-09-26)
6055 ============================
6057 * ~2200 changes, numerous bugfixes
6060 * The `for` loop syntax has changed to work with the `Iterator` trait.
6061 * At long last, unwinding works on Windows.
6062 * Default methods are ready for use.
6063 * Many trait inheritance bugs fixed.
6064 * Owned and borrowed trait objects work more reliably.
6065 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6066 * rustc can omit emission of code for the `debug!` macro if it is passed
6068 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6069 for foo.rs, then foo/mod.rs, and will generate an error when both are
6071 * Strings no longer contain trailing nulls. The new `std::c_str` module
6072 provides new mechanisms for converting to C strings.
6073 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6074 * The FFI has been overhauled such that foreign functions are called directly,
6075 instead of through a stack-switching wrapper.
6076 * Calling a foreign function must be done through a Rust function with the
6077 `#[fixed_stack_segment]` attribute.
6078 * The `externfn!` macro can be used to declare both a foreign function and
6079 a `#[fixed_stack_segment]` wrapper at once.
6080 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6081 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6082 * `priv` is disallowed everywhere except for struct fields and enum variants.
6083 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6084 * `ref` bindings in irrefutable patterns work correctly now.
6085 * `char` is now prevented from containing invalid code points.
6086 * Casting to `bool` is no longer allowed.
6087 * `\0` is now accepted as an escape in chars and strings.
6088 * `yield` is a reserved keyword.
6089 * `typeof` is a reserved keyword.
6090 * Crates may be imported by URL with `extern mod foo = "url";`.
6091 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6092 * Static vectors can be initialized with repeating elements,
6093 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6094 * Static structs can be initialized with functional record update,
6095 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6096 * `cfg!` can be used to conditionally execute code based on the crate
6097 configuration, similarly to `#[cfg(...)]`.
6098 * The `unnecessary_qualification` lint detects unneeded module
6099 prefixes (default: allow).
6100 * Arithmetic operations have been implemented on the SIMD types in
6101 `std::unstable::simd`.
6102 * Exchange allocation headers were removed, reducing memory usage.
6103 * `format!` implements a completely new, extensible, and higher-performance
6104 string formatting system. It will replace `fmt!`.
6105 * `print!` and `println!` write formatted strings (using the `format!`
6106 extension) to stdout.
6107 * `write!` and `writeln!` write formatted strings (using the `format!`
6108 extension) to the new Writers in `std::rt::io`.
6109 * The library section in which a function or static is placed may
6110 be specified with `#[link_section = "..."]`.
6111 * The `proto!` syntax extension for defining bounded message protocols
6113 * `macro_rules!` is hygienic for `let` declarations.
6114 * The `#[export_name]` attribute specifies the name of a symbol.
6115 * `unreachable!` can be used to indicate unreachable code, and fails
6119 * std: Transitioned to the new runtime, written in Rust.
6120 * std: Added an experimental I/O library, `rt::io`, based on the new
6122 * std: A new generic `range` function was added to the prelude, replacing
6123 `uint::range` and friends.
6124 * std: `range_rev` no longer exists. Since range is an iterator it can be
6125 reversed with `range(lo, hi).invert()`.
6126 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6127 renamed to `unwrap_or`.
6128 * std: The `iterator` module was renamed to `iter`.
6129 * std: Integral types now support the `checked_add`, `checked_sub`, and
6130 `checked_mul` operations for detecting overflow.
6131 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6133 * std: Methods are standardizing on conventions for casting methods:
6134 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6136 * std: The `CString` type in `c_str` provides new ways to convert to and
6138 * std: `DoubleEndedIterator` can yield elements in two directions.
6139 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6141 * std: `str::from_bytes` renamed to `str::from_utf8`.
6142 * std: `pop_opt` and `shift_opt` methods added to vectors.
6143 * std: The task-local data interface no longer uses @, and keys are
6144 no longer function pointers.
6145 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6146 * std: Added `SharedPort` to `comm`.
6147 * std: `Eq` has a default method for `ne`; only `eq` is required
6149 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6150 is required in implementations.
6151 * std: `is_utf8` performance is improved, impacting many string functions.
6152 * std: `os::MemoryMap` provides cross-platform mmap.
6153 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6154 are not 'in-bounds' are considered undefined.
6155 * std: Many freestanding functions in `vec` removed in favor of methods.
6156 * std: Many freestanding functions on scalar types removed in favor of
6158 * std: Many options to task builders were removed since they don't make
6159 sense in the new scheduler design.
6160 * std: More containers implement `FromIterator` so can be created by the
6162 * std: More complete atomic types in `unstable::atomics`.
6163 * std: `comm::PortSet` removed.
6164 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6165 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6166 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6167 default implementations.
6168 * std: Various `from_str` functions were removed in favor of a generic
6169 `from_str` which is available in the prelude.
6170 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6171 * extra: `dlist`, the doubly-linked list was modernized.
6172 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6173 * extra: Added `glob` module, replacing `std::os::glob`.
6174 * extra: `rope` was removed.
6175 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6176 * extra: `net`, and `timer` were removed. The experimental replacements
6177 are `std::rt::io::net` and `std::rt::io::timer`.
6178 * extra: Iterators implemented for `SmallIntMap`.
6179 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6180 * extra: `SmallIntSet` removed. Use `BitvSet`.
6181 * extra: Performance of JSON parsing greatly improved.
6182 * extra: `semver` updated to SemVer 2.0.0.
6183 * extra: `term` handles more terminals correctly.
6184 * extra: `dbg` module removed.
6185 * extra: `par` module removed.
6186 * extra: `future` was cleaned up, with some method renames.
6187 * extra: Most free functions in `getopts` were converted to methods.
6190 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6191 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6192 similarly to gcc's `--march` flag.
6193 * rustc's performance compiling small crates is much better.
6194 * rustpkg has received many improvements.
6195 * rustpkg supports git tags as package IDs.
6196 * rustpkg builds into target-specific directories so it can be used for
6198 * The number of concurrent test tasks is controlled by the environment
6199 variable RUST_TEST_TASKS.
6200 * The test harness can now report metrics for benchmarks.
6201 * All tools have man pages.
6202 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6203 * The runtime uses jemalloc for allocations.
6204 * Segmented stacks are temporarily disabled as part of the transition to
6205 the new runtime. Stack overflows are possible!
6206 * A new documentation backend, rustdoc_ng, is available for use. It is
6207 still invoked through the normal `rustdoc` command.
6210 Version 0.7 (2013-07-03)
6211 =======================
6213 * ~2000 changes, numerous bugfixes
6216 * `impl`s no longer accept a visibility qualifier. Put them on methods
6218 * The borrow checker has been rewritten with flow-sensitivity, fixing
6219 many bugs and inconveniences.
6220 * The `self` parameter no longer implicitly means `&'self self`,
6221 and can be explicitly marked with a lifetime.
6222 * Overloadable compound operators (`+=`, etc.) have been temporarily
6223 removed due to bugs.
6224 * The `for` loop protocol now requires `for`-iterators to return `bool`
6225 so they compose better.
6226 * The `Durable` trait is replaced with the `'static` bounds.
6227 * Trait default methods work more often.
6228 * Structs with the `#[packed]` attribute have byte alignment and
6229 no padding between fields.
6230 * Type parameters bound by `Copy` must now be copied explicitly with
6232 * It is now illegal to move out of a dereferenced unsafe pointer.
6233 * `Option<~T>` is now represented as a nullable pointer.
6234 * `@mut` does dynamic borrow checks correctly.
6235 * The `main` function is only detected at the topmost level of the crate.
6236 The `#[main]` attribute is still valid anywhere.
6237 * Struct fields may no longer be mutable. Use inherited mutability.
6238 * The `#[no_send]` attribute makes a type that would otherwise be
6240 * The `#[no_freeze]` attribute makes a type that would otherwise be
6242 * Unbounded recursion will abort the process after reaching the limit
6243 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6244 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6245 are never implicitly copyable.
6246 * `#[static_assert]` makes compile-time assertions about static bools.
6247 * At long last, 'argument modes' no longer exist.
6248 * The rarely used `use mod` statement no longer exists.
6251 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6253 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6254 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6256 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6257 and unsuffixed integer literals.
6260 * The `core` crate was renamed to `std`.
6261 * The `std` crate was renamed to `extra`.
6262 * More and improved documentation.
6263 * std: `iterator` module for external iterator objects.
6264 * Many old-style (internal, higher-order function) iterators replaced by
6265 implementations of `Iterator`.
6266 * std: Many old internal vector and string iterators,
6267 incl. `any`, `all`. removed.
6268 * std: The `finalize` method of `Drop` renamed to `drop`.
6269 * std: The `drop` method now takes `&mut self` instead of `&self`.
6270 * std: The prelude no longer re-exports any modules, only types and traits.
6271 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6272 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6273 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6274 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6275 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6276 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6277 * std: Many types implement `Clone`.
6278 * std: `path` type renamed to `Path`.
6279 * std: `mut` module and `Mut` type removed.
6280 * std: Many standalone functions removed in favor of methods and iterators
6281 in `vec`, `str`. In the future methods will also work as functions.
6282 * std: `reinterpret_cast` removed. Use `transmute`.
6283 * std: ascii string handling in `std::ascii`.
6284 * std: `Rand` is implemented for ~/@.
6285 * std: `run` module for spawning processes overhauled.
6286 * std: Various atomic types added to `unstable::atomic`.
6287 * std: Various types implement `Zero`.
6288 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6289 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6290 * std: Added `os::mkdir_recursive`.
6291 * std: Added `os::glob` function performs filesystems globs.
6292 * std: `FuzzyEq` renamed to `ApproxEq`.
6293 * std: `Map` now defines `pop` and `swap` methods.
6294 * std: `Cell` constructors converted to static methods.
6295 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6296 * extra: `flate` module moved from `std` to `extra`.
6297 * extra: `fileinput` module for iterating over a series of files.
6298 * extra: `Complex` number type and `complex` module.
6299 * extra: `Rational` number type and `rational` module.
6300 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6301 * extra: `term` uses terminfo now, is more correct.
6302 * extra: `arc` functions converted to methods.
6303 * extra: Implementation of fixed output size variations of SHA-2.
6306 * `unused_variable` lint mode for unused variables (default: warn).
6307 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6309 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6311 * `dead_assignment` lint mode for unread variables (default: warn).
6312 * `unnecessary_allocation` lint mode detects some heap allocations that are
6313 immediately borrowed so could be written without allocating (default: warn).
6314 * `missing_doc` lint mode (default: allow).
6315 * `unreachable_code` lint mode (default: warn).
6316 * The `rusti` command has been rewritten and a number of bugs addressed.
6317 * rustc outputs in color on more terminals.
6318 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6319 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6320 * Compiling with `-g` will make the binary record information about
6321 dynamic borrowcheck failures for debugging.
6322 * rustdoc has a nicer stylesheet.
6323 * Various improvements to rustdoc.
6324 * Improvements to rustpkg (see the detailed release notes).
6327 Version 0.6 (2013-04-03)
6328 ========================
6330 * ~2100 changes, numerous bugfixes
6333 * The self type parameter in traits is now spelled `Self`
6334 * The `self` parameter in trait and impl methods must now be explicitly
6335 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6336 * Static methods no longer require the `static` keyword and instead
6337 are distinguished by the lack of a `self` parameter
6338 * Replaced the `Durable` trait with the `'static` lifetime
6339 * The old closure type syntax with the trailing sigil has been
6340 removed in favor of the more consistent leading sigil
6341 * `super` is a keyword, and may be prefixed to paths
6342 * Trait bounds are separated with `+` instead of whitespace
6343 * Traits are implemented with `impl Trait for Type`
6344 instead of `impl Type: Trait`
6345 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6346 * The `export` keyword has finally been removed
6347 * The `move` keyword has been removed (see "Semantic changes")
6348 * The interior mutability qualifier on vectors, `[mut T]`, has been
6349 removed. Use `&mut [T]`, etc.
6350 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6351 * `fail` is no longer a keyword. Use `fail!()`
6352 * `assert` is no longer a keyword. Use `assert!()`
6353 * `log` is no longer a keyword. use `debug!`, etc.
6354 * 1-tuples may be represented as `(T,)`
6355 * Struct fields may no longer be `mut`. Use inherited mutability,
6356 `@mut T`, `core::mut` or `core::cell`
6357 * `extern mod { ... }` is no longer valid syntax for foreign
6358 function modules. Use extern blocks: `extern { ... }`
6359 * Newtype enums removed. Use tuple-structs.
6360 * Trait implementations no longer support visibility modifiers
6361 * Pattern matching over vectors improved and expanded
6362 * `const` renamed to `static` to correspond to lifetime name,
6363 and make room for future `static mut` unsafe mutable globals.
6364 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6365 * `Clone` implementations can be automatically generated with
6366 `#[deriving(Clone)]`
6367 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6368 instead of `foo as Bar`.
6369 * Fixed length vector types are now written as `[int, .. 3]`
6370 instead of `[int * 3]`.
6371 * Fixed length vector types can express the length as a constant
6372 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6375 * Types with owned pointers or custom destructors move by default,
6376 eliminating the `move` keyword
6377 * All foreign functions are considered unsafe
6378 * &mut is now unaliasable
6379 * Writes to borrowed @mut pointers are prevented dynamically
6381 * The name of the main function can be customized using #[main]
6382 * The default type of an inferred closure is &fn instead of @fn
6383 * `use` statements may no longer be "chained" - they cannot import
6384 identifiers imported by previous `use` statements
6385 * `use` statements are crate relative, importing from the "top"
6386 of the crate by default. Paths may be prefixed with `super::`
6387 or `self::` to change the search behavior.
6388 * Method visibility is inherited from the implementation declaration
6389 * Structural records have been removed
6390 * Many more types can be used in static items, including enums
6391 'static-lifetime pointers and vectors
6392 * Pattern matching over vectors improved and expanded
6393 * Typechecking of closure types has been overhauled to
6394 improve inference and eliminate unsoundness
6395 * Macros leave scope at the end of modules, unless that module is
6396 tagged with #[macro_escape]
6399 * Added big integers to `std::bigint`
6400 * Removed `core::oldcomm` module
6401 * Added pipe-based `core::comm` module
6402 * Numeric traits have been reorganized under `core::num`
6403 * `vec::slice` finally returns a slice
6404 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
6405 * Containers reorganized around traits in `core::container`
6406 * `core::dvec` removed, `~[T]` is a drop-in replacement
6407 * `core::send_map` renamed to `core::hashmap`
6408 * `std::map` removed; replaced with `core::hashmap`
6409 * `std::treemap` reimplemented as an owned balanced tree
6410 * `std::deque` and `std::smallintmap` reimplemented as owned containers
6411 * `core::trie` added as a fast ordered map for integer keys
6412 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
6413 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
6414 overload the comparison operators, whereas `TotalOrd` is used
6415 by certain container types
6418 * Replaced the 'cargo' package manager with 'rustpkg'
6419 * Added all-purpose 'rust' tool
6420 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
6421 * rustc now *attempts* to offer spelling suggestions
6422 * Improved support for ARM and Android
6423 * Preliminary MIPS backend
6424 * Improved foreign function ABI implementation for x86, x86_64
6425 * Various memory usage improvements
6426 * Rust code may be embedded in foreign code under limited circumstances
6427 * Inline assembler supported by new asm!() syntax extension.
6430 Version 0.5 (2012-12-21)
6431 ===========================
6433 * ~900 changes, numerous bugfixes
6436 * Removed `<-` move operator
6437 * Completed the transition from the `#fmt` extension syntax to `fmt!`
6438 * Removed old fixed length vector syntax - `[T]/N`
6439 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
6440 * Macros may now expand to items and statements
6441 * `a.b()` is always parsed as a method call, never as a field projection
6442 * `Eq` and `IterBytes` implementations can be automatically generated
6443 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
6444 * Removed the special crate language for `.rc` files
6445 * Function arguments may consist of any irrefutable pattern
6448 * `&` and `~` pointers may point to objects
6449 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
6450 * Enum variants may be structs
6451 * Destructors can be added to all nominal types with the Drop trait
6452 * Structs and nullary enum variants may be constants
6453 * Values that cannot be implicitly copied are now automatically moved
6454 without writing `move` explicitly
6455 * `&T` may now be coerced to `*T`
6456 * Coercions happen in `let` statements as well as function calls
6457 * `use` statements now take crate-relative paths
6458 * The module and type namespaces have been merged so that static
6459 method names can be resolved under the trait in which they are
6462 * Improved support for language features
6463 * Trait inheritance works in many scenarios
6464 * More support for explicit self arguments in methods - `self`, `&self`
6465 `@self`, and `~self` all generally work as expected
6466 * Static methods work in more situations
6467 * Experimental: Traits may declare default methods for the implementations
6471 * New condition handling system in `core::condition`
6472 * Timsort added to `std::sort`
6473 * New priority queue, `std::priority_queue`
6474 * Pipes for serializable types, `std::flatpipes'
6475 * Serialization overhauled to be trait-based
6476 * Expanded `getopts` definitions
6477 * Moved futures to `std`
6478 * More functions are pure now
6479 * `core::comm` renamed to `oldcomm`. Still deprecated
6480 * `rustdoc` and `cargo` are libraries now
6483 * Added a preliminary REPL, `rusti`
6484 * License changed from MIT to dual MIT/APL2
6487 Version 0.4 (2012-10-15)
6488 ==========================
6490 * ~2000 changes, numerous bugfixes
6493 * All keywords are now strict and may not be used as identifiers anywhere
6494 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
6495 'of', 'with', 'to', 'class'.
6496 * Classes are replaced with simpler structs
6497 * Explicit method self types
6498 * `ret` became `return` and `alt` became `match`
6499 * `import` is now `use`; `use is now `extern mod`
6500 * `extern mod { ... }` is now `extern { ... }`
6501 * `use mod` is the recommended way to import modules
6502 * `pub` and `priv` replace deprecated export lists
6503 * The syntax of `match` pattern arms now uses fat arrow (=>)
6504 * `main` no longer accepts an args vector; use `os::args` instead
6507 * Trait implementations are now coherent, ala Haskell typeclasses
6508 * Trait methods may be static
6509 * Argument modes are deprecated
6510 * Borrowed pointers are much more mature and recommended for use
6511 * Strings and vectors in the static region are stored in constant memory
6512 * Typestate was removed
6513 * Resolution rewritten to be more reliable
6514 * Support for 'dual-mode' data structures (freezing and thawing)
6517 * Most binary operators can now be overloaded via the traits in
6519 * `std::net::url` for representing URLs
6520 * Sendable hash maps in `core::send_map`
6521 * `core::task' gained a (currently unsafe) task-local storage API
6524 * An efficient new intertask communication primitive called the pipe,
6525 along with a number of higher-level channel types, in `core::pipes`
6526 * `std::arc`, an atomically reference counted, immutable, shared memory
6528 * `std::sync`, various exotic synchronization tools based on arcs and pipes
6529 * Futures are now based on pipes and sendable
6530 * More robust linked task failure
6531 * Improved task builder API
6534 * Improved error reporting
6535 * Preliminary JIT support
6536 * Preliminary work on precise GC
6537 * Extensive architectural improvements to rustc
6538 * Begun a transition away from buggy C++-based reflection (shape) code to
6539 Rust-based (visitor) code
6540 * All hash functions and tables converted to secure, randomized SipHash
6543 Version 0.3 (2012-07-12)
6544 ========================
6546 * ~1900 changes, numerous bugfixes
6548 * New coding conveniences
6549 * Integer-literal suffix inference
6550 * Per-item control over warnings, errors
6551 * #[cfg(windows)] and #[cfg(unix)] attributes
6552 * Documentation comments
6553 * More compact closure syntax
6554 * 'do' expressions for treating higher-order functions as
6556 * *-patterns (wildcard extended to all constructor fields)
6559 * Name resolution pass and exhaustiveness checker rewritten
6560 * Region pointers and borrow checking supersede alias
6562 * Init-ness checking is now provided by a region-based liveness
6563 pass instead of the typestate pass; same for last-use analysis
6564 * Extensive work on region pointers
6566 * Experimental new language features
6567 * Slices and fixed-size, interior-allocated vectors
6568 * #!-comments for lang versioning, shell execution
6569 * Destructors and iface implementation for classes;
6570 type-parameterized classes and class methods
6571 * 'const' type kind for types that can be used to implement
6572 shared-memory concurrency patterns
6576 * Removal of various obsolete features
6577 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6578 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6580 * Constructs: do-while loops ('do' repurposed), fn binding,
6581 resources (replaced by destructors)
6583 * Compiler reorganization
6584 * Syntax-layer of compiler split into separate crate
6585 * Clang (from LLVM project) integrated into build
6586 * Typechecker split into sub-modules
6589 * New time functions
6590 * Extension methods for many built-in types
6591 * Arc: atomic-refcount read-only / exclusive-use shared cells
6592 * Par: parallel map and search routines
6593 * Extensive work on libuv interface
6594 * Much vector code moved to libraries
6595 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6596 #include, #include_str, #include_bin
6599 * Cargo automatically resolves dependencies
6602 Version 0.2 (2012-03-29)
6603 =========================
6605 * >1500 changes, numerous bugfixes
6607 * New docs and doc tooling
6609 * New port: FreeBSD x86_64
6611 * Compilation model enhancements
6612 * Generics now specialized, multiply instantiated
6613 * Functions now inlined across separate crates
6615 * Scheduling, stack and threading fixes
6616 * Noticeably improved message-passing performance
6617 * Explicit schedulers
6621 * Experimental new language features
6622 * Operator overloading
6626 * Various language extensions
6627 * C-callback function types: 'crust fn ...'
6628 * Infinite-loop construct: 'loop { ... }'
6629 * Shorten 'mutable' to 'mut'
6630 * Required mutable-local qualifier: 'let mut ...'
6631 * Basic glob-exporting: 'export foo::*;'
6632 * Alt now exhaustive, 'alt check' for runtime-checked
6633 * Block-function form of 'for' loop, with 'break' and 'ret'.
6636 * AST quasi-quote syntax extension
6637 * Revived libuv interface
6638 * New modules: core::{future, iter}, std::arena
6639 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6640 * Extensive cleanup, regularization in libstd, libcore
6643 Version 0.1 (2012-01-20)
6644 ===============================
6646 * Most language features work, including:
6647 * Unique pointers, unique closures, move semantics
6648 * Interface-constrained generics
6649 * Static interface dispatch
6651 * Multithread task scheduling
6652 * Typestate predicates
6653 * Failure unwinding, destructors
6654 * Pattern matching and destructuring assignment
6655 * Lightweight block-lambda syntax
6656 * Preliminary macro-by-example
6658 * Compiler works with the following configurations:
6659 * Linux: x86 and x86_64 hosts and targets
6660 * macOS: x86 and x86_64 hosts and targets
6661 * Windows: x86 hosts and targets
6663 * Cross compilation / multi-target configuration supported.
6665 * Preliminary API-documentation and package-management tools included.
6669 * Documentation is incomplete.
6671 * Performance is below intended target.
6673 * Standard library APIs are subject to extensive change, reorganization.
6675 * Language-level versioning is not yet operational - future code will