1 Version 1.60.0 (2022-04-07)
2 ==========================
6 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
7 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
11 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
12 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
13 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
14 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
15 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
16 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
17 - [Fix invalid removal of newlines from doc comments][92357]
18 - [Add kernel target for RustyHermit][92670]
19 - [Deny mixing bin crate type with lib crate types][92933]
20 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
21 - [Upgrade to LLVM 14][93577]
23 \* Refer to Rust's [platform support page][platform-support-doc] for more
24 information on Rust's tiered platform support.
28 - [Guarantee call order for `sort_by_cached_key`][89621]
29 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
30 - [Make `Instant::{duration_since, elapsed, sub}` saturating and remove workarounds][89926]
31 - [Change PhantomData type for `BuildHasherDefault` (and more)][92630]
35 - [`Arc::new_cyclic`][arc_new_cyclic]
36 - [`Rc::new_cyclic`][rc_new_cyclic]
37 - [`slice::EscapeAscii`][slice_escape_ascii]
38 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
39 - [`u8::escape_ascii`][u8_escape_ascii]
40 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
41 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
42 - [`MaybeUninit::assume_init_read`][assume_init_read]
43 - [`i8::abs_diff`][i8_abs_diff]
44 - [`i16::abs_diff`][i16_abs_diff]
45 - [`i32::abs_diff`][i32_abs_diff]
46 - [`i64::abs_diff`][i64_abs_diff]
47 - [`i128::abs_diff`][i128_abs_diff]
48 - [`isize::abs_diff`][isize_abs_diff]
49 - [`u8::abs_diff`][u8_abs_diff]
50 - [`u16::abs_diff`][u16_abs_diff]
51 - [`u32::abs_diff`][u32_abs_diff]
52 - [`u64::abs_diff`][u64_abs_diff]
53 - [`u128::abs_diff`][u128_abs_diff]
54 - [`usize::abs_diff`][usize_abs_diff]
55 - [`Display for io::ErrorKind`][display_error_kind]
56 - [`From<u8> for ExitCode`][from_u8_exit_code]
57 - [`Not for !` (the "never" type)][not_never]
58 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
59 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
63 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
64 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
65 - [Stabilize namespaced and weak dependency features.][cargo/10269]
66 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
67 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
71 - [Add manifest docs fallback for tier-2 platforms.][92800]
72 - [Drop rustc-docs from complete profile][93742]
73 - [bootstrap: tidy up flag handling for llvm build][93918]
77 - [Remove compiler-rt linking hack on Android][83822]
82 These changes provide no direct user facing benefits, but represent significant
83 improvements to the internals and overall performance of rustc
86 - [Switch all libraries to the 2021 edition][92068]
88 [83822]: https://github.com/rust-lang/rust/pull/83822
89 [86374]: https://github.com/rust-lang/rust/pull/86374
90 [87487]: https://github.com/rust-lang/rust/pull/87487
91 [89621]: https://github.com/rust-lang/rust/pull/89621
92 [89926]: https://github.com/rust-lang/rust/pull/89926
93 [90132]: https://github.com/rust-lang/rust/pull/90132
94 [90247]: https://github.com/rust-lang/rust/pull/90247
95 [91606]: https://github.com/rust-lang/rust/pull/91606
96 [92068]: https://github.com/rust-lang/rust/pull/92068
97 [92300]: https://github.com/rust-lang/rust/pull/92300
98 [92357]: https://github.com/rust-lang/rust/pull/92357
99 [92383]: https://github.com/rust-lang/rust/pull/92383
100 [92630]: https://github.com/rust-lang/rust/pull/92630
101 [92670]: https://github.com/rust-lang/rust/pull/92670
102 [92800]: https://github.com/rust-lang/rust/pull/92800
103 [92933]: https://github.com/rust-lang/rust/pull/92933
104 [93566]: https://github.com/rust-lang/rust/pull/93566
105 [93577]: https://github.com/rust-lang/rust/pull/93577
106 [93658]: https://github.com/rust-lang/rust/pull/93658
107 [93742]: https://github.com/rust-lang/rust/pull/93742
108 [93824]: https://github.com/rust-lang/rust/pull/93824
109 [93918]: https://github.com/rust-lang/rust/pull/93918
111 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
112 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
113 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
114 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
115 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
117 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
118 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
119 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
120 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
121 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
122 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
123 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
124 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
125 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
126 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
127 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
128 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
129 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
130 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
131 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
132 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
133 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
134 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
135 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
136 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
137 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
138 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
139 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
140 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
141 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
143 Version 1.59.0 (2022-02-24)
144 ==========================
149 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
150 - [Stabilize destructuring assignment][90521]
151 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
152 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
157 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
158 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
159 - [Fix sparc64 ABI for aggregates with floating point members][91003]
160 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
161 - [Add support for riscv64gc-unknown-freebsd][91284]
162 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
163 - [Soft disable incremental compilation][94124]
165 This release disables incremental compilation, unless the user has explicitly
166 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
167 This is due to a known and relatively frequently occurring bug in incremental
168 compilation, which causes builds to issue internal compiler errors. This
169 particular bug is already fixed on nightly, but that fix has not yet rolled out
170 to stable and is deemed too risky for a direct stable backport.
172 As always, we encourage users to test with nightly and report bugs so that we
173 can track failures and fix issues earlier.
175 See [94124] for more details.
177 [94124]: https://github.com/rust-lang/rust/issues/94124
182 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
187 - [`std::thread::available_parallelism`][available_parallelism]
188 - [`Result::copied`][result-copied]
189 - [`Result::cloned`][result-cloned]
190 - [`arch::asm!`][asm]
191 - [`arch::global_asm!`][global_asm]
192 - [`ops::ControlFlow::is_break`][is_break]
193 - [`ops::ControlFlow::is_continue`][is_continue]
194 - [`TryFrom<char> for u8`][try_from_char_u8]
195 - [`char::TryFromCharError`][try_from_char_err]
196 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
198 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
199 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
200 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
201 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
202 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
203 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
204 - [`DoubleEndedIterator for ToLowercase`][lowercase]
205 - [`DoubleEndedIterator for ToUppercase`][uppercase]
206 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
207 - [`UnwindSafe for Once`][unwindsafe_once]
208 - [`RefUnwindSafe for Once`][refunwindsafe_once]
209 - [armv8 neon intrinsics for aarch64][stdarch/1266]
213 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
214 - [`mem::MaybeUninit::assume_init`][muninit_init]
215 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
216 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
221 - [Stabilize the `strip` profile option][cargo/10088]
222 - [Stabilize future-incompat-report][cargo/10165]
223 - [Support abbreviating `--release` as `-r`][cargo/10133]
224 - [Support `term.quiet` configuration][cargo/10152]
225 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
230 - [Refactor weak symbols in std::sys::unix][90846]
231 This may add new, versioned, symbols when building with a newer glibc, as the
232 standard library uses weak linkage rather than dynamically attempting to load
233 certain symbols at runtime.
234 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
235 This adds a future compatibility lint to supporting the use of cfg_attr
236 wrapping either crate_type or crate_name specification within Rust files;
237 it is recommended that users migrate to setting the equivalent command line
239 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
240 This may expose new names, leading to conflicts with preexisting names in a
241 given namespace and a compilation failure.
242 - [Cargo will document libraries before binaries.][cargo/10172]
243 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
244 - [Weaken guarantee around advancing underlying iterators in zip][83791]
245 - [Make split_inclusive() on an empty slice yield an empty output][89825]
246 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
247 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
252 These changes provide no direct user facing benefits, but represent significant
253 improvements to the internals and overall performance of rustc
256 - [Fix many cases of normalization-related ICEs][91255]
257 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
258 - [Store liveness in interval sets for region inference][90637]
260 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
261 unstable feature.][91867]
263 [91867]: https://github.com/rust-lang/rust/issues/91867
264 [83744]: https://github.com/rust-lang/rust/pull/83744/
265 [83791]: https://github.com/rust-lang/rust/pull/83791/
266 [85013]: https://github.com/rust-lang/rust/pull/85013/
267 [89825]: https://github.com/rust-lang/rust/pull/89825/
268 [89999]: https://github.com/rust-lang/rust/pull/89999/
269 [90128]: https://github.com/rust-lang/rust/pull/90128/
270 [90207]: https://github.com/rust-lang/rust/pull/90207/
271 [90521]: https://github.com/rust-lang/rust/pull/90521/
272 [90586]: https://github.com/rust-lang/rust/pull/90586/
273 [90637]: https://github.com/rust-lang/rust/pull/90637/
274 [90833]: https://github.com/rust-lang/rust/pull/90833/
275 [90846]: https://github.com/rust-lang/rust/pull/90846/
276 [91003]: https://github.com/rust-lang/rust/pull/91003/
277 [91172]: https://github.com/rust-lang/rust/pull/91172/
278 [91255]: https://github.com/rust-lang/rust/pull/91255/
279 [91284]: https://github.com/rust-lang/rust/pull/91284/
280 [91535]: https://github.com/rust-lang/rust/pull/91535/
281 [91593]: https://github.com/rust-lang/rust/pull/91593/
282 [91728]: https://github.com/rust-lang/rust/pull/91728/
283 [91878]: https://github.com/rust-lang/rust/pull/91878/
284 [91896]: https://github.com/rust-lang/rust/pull/91896/
285 [91926]: https://github.com/rust-lang/rust/pull/91926/
286 [91984]: https://github.com/rust-lang/rust/pull/91984/
287 [92020]: https://github.com/rust-lang/rust/pull/92020/
288 [92034]: https://github.com/rust-lang/rust/pull/92034/
289 [92137]: https://github.com/rust-lang/rust/pull/92137/
290 [92483]: https://github.com/rust-lang/rust/pull/92483/
291 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
292 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
293 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
294 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
295 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
296 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
297 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
298 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
300 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
301 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
302 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
303 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
304 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
305 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
306 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
307 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
308 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
309 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
310 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
311 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
312 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
313 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
314 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
315 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
316 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
317 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
318 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
319 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
320 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
321 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
322 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
323 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
324 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
325 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
327 Version 1.58.1 (2022-01-19)
328 ===========================
330 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
331 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
332 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
333 * [Fix wrong error message displayed when some imports are missing][91254]
334 * [Fix rustfmt not formatting generated files from stdin][92912]
336 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
337 [91254]: https://github.com/rust-lang/rust/pull/91254
338 [92912]: https://github.com/rust-lang/rust/pull/92912
339 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
340 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
342 Version 1.58.0 (2022-01-13)
343 ==========================
348 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
349 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
350 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
355 - [Add LLVM CFI support to the Rust compiler][89652]
356 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
357 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
358 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
359 - [Update the minimum external LLVM to 12][90175]
360 - [Add `x86_64-unknown-none` at Tier 3*][89062]
361 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
362 - [Don't abort compilation after giving a lint error][87337]
363 - [Error messages point at the source of trait bound obligations in more places][89580]
365 \* Refer to Rust's [platform support page][platform-support-doc] for more
366 information on Rust's tiered platform support.
371 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
372 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
373 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
374 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
375 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
376 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
381 - [`Metadata::is_symlink`]
382 - [`Path::is_symlink`]
383 - [`{integer}::saturating_div`]
384 - [`Option::unwrap_unchecked`]
385 - [`Result::unwrap_unchecked`]
386 - [`Result::unwrap_err_unchecked`]
389 These APIs are now usable in const contexts:
392 - [`Duration::checked_add`]
393 - [`Duration::saturating_add`]
394 - [`Duration::checked_sub`]
395 - [`Duration::saturating_sub`]
396 - [`Duration::checked_mul`]
397 - [`Duration::saturating_mul`]
398 - [`Duration::checked_div`]
403 - [Add --message-format for install command][cargo/10107]
404 - [Warn when alias shadows external subcommand][cargo/10082]
409 - [Show all Deref implementations recursively in rustdoc][90183]
410 - [Use computed visibility in rustdoc][88447]
415 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
416 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
417 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
418 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
419 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
420 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
425 These changes provide no direct user facing benefits, but represent significant
426 improvements to the internals and overall performance of rustc
429 - [Implement coherence checks for negative trait impls][90104]
430 - [Add rustc lint, warning when iterating over hashmaps][89558]
431 - [Optimize live point computation][90491]
432 - [Enable verification for 1/32nd of queries loaded from disk][90361]
433 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
435 [87337]: https://github.com/rust-lang/rust/pull/87337/
436 [87467]: https://github.com/rust-lang/rust/pull/87467/
437 [87704]: https://github.com/rust-lang/rust/pull/87704/
438 [88041]: https://github.com/rust-lang/rust/pull/88041/
439 [88447]: https://github.com/rust-lang/rust/pull/88447/
440 [88601]: https://github.com/rust-lang/rust/pull/88601/
441 [89062]: https://github.com/rust-lang/rust/pull/89062/
442 [89174]: https://github.com/rust-lang/rust/pull/89174/
443 [89551]: https://github.com/rust-lang/rust/pull/89551/
444 [89558]: https://github.com/rust-lang/rust/pull/89558/
445 [89580]: https://github.com/rust-lang/rust/pull/89580/
446 [89652]: https://github.com/rust-lang/rust/pull/89652/
447 [90041]: https://github.com/rust-lang/rust/pull/90041/
448 [90058]: https://github.com/rust-lang/rust/pull/90058/
449 [90104]: https://github.com/rust-lang/rust/pull/90104/
450 [90117]: https://github.com/rust-lang/rust/pull/90117/
451 [90175]: https://github.com/rust-lang/rust/pull/90175/
452 [90183]: https://github.com/rust-lang/rust/pull/90183/
453 [90297]: https://github.com/rust-lang/rust/pull/90297/
454 [90329]: https://github.com/rust-lang/rust/pull/90329/
455 [90361]: https://github.com/rust-lang/rust/pull/90361/
456 [90417]: https://github.com/rust-lang/rust/pull/90417/
457 [90473]: https://github.com/rust-lang/rust/pull/90473/
458 [90491]: https://github.com/rust-lang/rust/pull/90491/
459 [90733]: https://github.com/rust-lang/rust/pull/90733/
460 [90833]: https://github.com/rust-lang/rust/pull/90833/
461 [90846]: https://github.com/rust-lang/rust/pull/90846/
462 [91026]: https://github.com/rust-lang/rust/pull/91026/
463 [91207]: https://github.com/rust-lang/rust/pull/91207/
464 [91255]: https://github.com/rust-lang/rust/pull/91255/
465 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
466 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
467 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
468 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
469 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
470 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
471 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
472 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
473 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
474 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
476 Version 1.57.0 (2021-12-02)
477 ==========================
482 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
483 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
484 - [Allow panicking in constant evaluation.][89508]
485 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
490 - [Create more accurate debuginfo for vtables.][89597]
491 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
492 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
493 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
494 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
496 \* Refer to Rust's [platform support page][platform-support-doc] for more
497 information on Rust's tiered platform support.
502 - [Avoid allocations and copying in `Vec::leak`][89337]
503 - [Add `#[repr(i8)]` to `Ordering`][89507]
504 - [Optimize `File::read_to_end` and `read_to_string`][89582]
505 - [Update to Unicode 14.0][89614]
506 - [Many more functions are marked `#[must_use]`][89692], producing a warning
507 when ignoring their return value. This helps catch mistakes such as expecting
508 a function to mutate a value in place rather than return a new value.
513 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
514 - [`[T; N]::as_slice`][`array::as_slice`]
515 - [`collections::TryReserveError`]
516 - [`HashMap::try_reserve`]
517 - [`HashSet::try_reserve`]
518 - [`String::try_reserve`]
519 - [`String::try_reserve_exact`]
520 - [`Vec::try_reserve`]
521 - [`Vec::try_reserve_exact`]
522 - [`VecDeque::try_reserve`]
523 - [`VecDeque::try_reserve_exact`]
524 - [`Iterator::map_while`]
526 - [`proc_macro::is_available`]
527 - [`Command::get_program`]
528 - [`Command::get_args`]
529 - [`Command::get_envs`]
530 - [`Command::get_current_dir`]
534 These APIs are now usable in const contexts:
536 - [`hint::unreachable_unchecked`]
541 - [Stabilize custom profiles][cargo/9943]
546 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
547 This will break some builds that set `#![deny(dead_code)]`.
551 These changes provide no direct user facing benefits, but represent significant
552 improvements to the internals and overall performance of rustc
555 - [Added an experimental backend for codegen with `libgccjit`.][87260]
557 [85200]: https://github.com/rust-lang/rust/pull/85200/
558 [86191]: https://github.com/rust-lang/rust/pull/86191/
559 [87220]: https://github.com/rust-lang/rust/pull/87220/
560 [87260]: https://github.com/rust-lang/rust/pull/87260/
561 [88321]: https://github.com/rust-lang/rust/pull/88321/
562 [88529]: https://github.com/rust-lang/rust/pull/88529/
563 [88690]: https://github.com/rust-lang/rust/pull/88690/
564 [88952]: https://github.com/rust-lang/rust/pull/88952/
565 [89337]: https://github.com/rust-lang/rust/pull/89337/
566 [89507]: https://github.com/rust-lang/rust/pull/89507/
567 [89508]: https://github.com/rust-lang/rust/pull/89508/
568 [89582]: https://github.com/rust-lang/rust/pull/89582/
569 [89597]: https://github.com/rust-lang/rust/pull/89597/
570 [89614]: https://github.com/rust-lang/rust/pull/89614/
571 [89692]: https://github.com/rust-lang/rust/issues/89692/
572 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
573 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
574 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
575 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
576 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
577 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
578 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
579 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
580 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
581 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
582 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
583 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
584 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
585 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
586 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
587 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
588 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
589 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
590 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
591 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
592 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
594 Version 1.56.1 (2021-11-01)
595 ===========================
597 - New lints to detect the presence of bidirectional-override Unicode
598 codepoints in the compiled source code ([CVE-2021-42574])
600 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
602 Version 1.56.0 (2021-10-21)
603 ========================
608 - [The 2021 Edition is now stable.][rust#88100]
609 See [the edition guide][rust-2021-edition-guide] for more details.
610 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
611 - [Union field access is permitted in `const fn`.][rust#85769]
613 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
618 - [Upgrade to LLVM 13.][rust#87570]
619 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
620 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
621 - [Warnings can be forced on with `--force-warn`.][rust#87472]
622 This feature is primarily intended for usage by `cargo fix`, rather than end users.
623 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
624 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
625 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
627 \* Refer to Rust's [platform support page][platform-support-doc] for more
628 information on Rust's tiered platform support.
633 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
634 The Windows console still requires valid Unicode, but this change allows
635 splitting a UTF-8 character across multiple write calls. This allows, for
636 instance, programs that just read and write data buffers (e.g. copying a file
637 to stdout) without regard for Unicode or character boundaries.
638 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
639 For this use case, atomics scale much better under contention.
640 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
641 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
642 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
643 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
644 - [Treat invalid environment variable names as non-existent.][rust#86183]
645 Previously, the environment functions would panic if given a variable name
646 with an internal null character or equal sign (`=`). Now, these functions will
647 just treat such names as non-existent variables, since the OS cannot represent
648 the existence of a variable with such a name.
653 - [`std::os::unix::fs::chroot`]
654 - [`UnsafeCell::raw_get`]
655 - [`BufWriter::into_parts`]
656 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
657 These APIs were previously stable in `std`, but are now also available in `core`.
659 - [`String::shrink_to`]
660 - [`OsString::shrink_to`]
661 - [`PathBuf::shrink_to`]
662 - [`BinaryHeap::shrink_to`]
663 - [`VecDeque::shrink_to`]
664 - [`HashMap::shrink_to`]
665 - [`HashSet::shrink_to`]
667 These APIs are now usable in const contexts:
669 - [`std::mem::transmute`]
670 - [`[T]::first`][`slice::first`]
671 - [`[T]::split_first`][`slice::split_first`]
672 - [`[T]::last`][`slice::last`]
673 - [`[T]::split_last`][`slice::split_last`]
678 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
679 This has no effect at present on dependency version selection.
680 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
681 that support Rust code to include a crate's specified minimum version in the test matrix for that
687 - [Update to new argument parsing rules on Windows.][rust#87580]
688 This adjusts Rust's standard library to match the behavior of the standard
689 libraries for C/C++. The rules have changed slightly over time, and this PR
690 brings us to the latest set of rules (changed in 2008).
691 - [Disallow the aapcs calling convention on aarch64][rust#88399]
692 This was already not supported by LLVM; this change surfaces this lack of
693 support with a better error message.
694 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
695 - [Warn when an escaped newline skips multiple lines.][rust#87671]
696 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
697 may return different values on glibc <= 2.24.][rust#81825]
698 Rust now invokes the `clone3` system call directly, when available, to use new functionality
699 available via that system call. Older versions of glibc cache the result of `getpid`, and only
700 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
701 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
705 These changes provide no direct user facing benefits, but represent significant
706 improvements to the internals and overall performance of rustc
709 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
710 This improves the performance of most Rust builds.
711 - [Unify representation of macros in internal data structures.][rust#88019]
712 This change fixes a host of bugs with the handling of macros by the compiler,
715 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
716 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
717 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
718 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
719 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
720 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
721 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
722 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
723 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
724 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
725 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
726 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
727 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
728 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
729 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
730 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
731 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
732 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
733 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
734 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
735 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
736 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
737 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
738 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
739 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
740 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
741 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
742 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
743 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
744 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
745 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
746 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
747 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
748 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
749 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
750 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
751 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
752 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
753 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
754 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
755 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
756 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
758 Version 1.55.0 (2021-09-09)
759 ============================
763 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
764 will end at the maximum value of the integer.][83918]
765 - [You can now explicitly import the prelude of different editions
766 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
770 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
772 \* Refer to Rust's [platform support page][platform-support-doc] for more
773 information on Rust's tiered platform support.
778 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
779 These improvements should in general provide faster string parsing of floats,
780 no longer reject certain valid floating point values, and reduce
781 the produced code size for non-stripped artifacts.
782 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
789 - [`IntoInnerError::into_error`]
790 - [`IntoInnerError::into_parts`]
791 - [`MaybeUninit::assume_init_mut`]
792 - [`MaybeUninit::assume_init_ref`]
793 - [`MaybeUninit::write`]
795 - [`ops::ControlFlow`]
797 - [`x86::_bittestandcomplement`]
798 - [`x86::_bittestandreset`]
799 - [`x86::_bittestandset`]
800 - [`x86_64::_bittest64`]
801 - [`x86_64::_bittestandcomplement64`]
802 - [`x86_64::_bittestandreset64`]
803 - [`x86_64::_bittestandset64`]
805 The following previously stable functions are now `const`.
807 - [`str::from_utf8_unchecked`]
812 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
813 rustc in parallel such as when using `cargo test`.][cargo/9675]
814 - [The package definition in `cargo metadata` now includes the `"default_run"`
815 field from the manifest.][cargo/9550]
816 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
817 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
818 of packages.][cargo/9663]
822 - [Added "Go to item on exact match" search option.][85876]
823 - [The "Implementors" section on traits no longer shows redundant
824 method definitions.][85970]
825 - [Trait implementations are toggled open by default.][86260] This should make the
826 implementations more searchable by tools like `CTRL+F` in your browser.
827 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
828 through type aliases.][86334]
829 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
830 "Trait Implementations" section.][86513]
835 - [std functions that return an `io::Error` will no longer use the
836 `ErrorKind::Other` variant.][85746] This is to better reflect that these
837 kinds of errors could be categorised [into newer more specific `ErrorKind`
838 variants][79965], and that they do not represent a user error.
839 - [Using environment variable names with `process::Command` on Windows now
840 behaves as expected.][85270] Previously using envionment variables with
841 `Command` would cause them to be ASCII-uppercased.
842 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
843 with `rustdoc::`][86849]
844 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
845 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
846 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
849 [86849]: https://github.com/rust-lang/rust/pull/86849
850 [86513]: https://github.com/rust-lang/rust/pull/86513
851 [86334]: https://github.com/rust-lang/rust/pull/86334
852 [86260]: https://github.com/rust-lang/rust/pull/86260
853 [85970]: https://github.com/rust-lang/rust/pull/85970
854 [85876]: https://github.com/rust-lang/rust/pull/85876
855 [83572]: https://github.com/rust-lang/rust/pull/83572
856 [86294]: https://github.com/rust-lang/rust/pull/86294
857 [86858]: https://github.com/rust-lang/rust/pull/86858
858 [86761]: https://github.com/rust-lang/rust/pull/86761
859 [85746]: https://github.com/rust-lang/rust/pull/85746
860 [85270]: https://github.com/rust-lang/rust/pull/85270
861 [83918]: https://github.com/rust-lang/rust/pull/83918
862 [79965]: https://github.com/rust-lang/rust/pull/79965
863 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
864 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
865 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
866 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
867 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
868 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
869 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
870 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
871 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
872 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
873 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
874 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
875 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
876 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
877 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
878 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
879 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
880 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
881 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
882 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
883 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
884 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
887 Version 1.54.0 (2021-07-29)
888 ============================
891 -----------------------
893 - [You can now use macros for values in some built-in attributes.][83366]
894 This primarily allows you to call macros within the `#[doc]` attribute. For
895 example, to include external documentation in your crate, you can now write
898 #![doc = include_str!("README.md")]
901 - [You can now cast between unsized slice types (and types which contain
902 unsized slices) in `const fn`.][85078]
903 - [You can now use multiple generic lifetimes with `impl Trait` where the
904 lifetimes don't explicitly outlive another.][84701] In code this means
905 that you can now have `impl Trait<'a, 'b>` where as before you could
906 only have `impl Trait<'a, 'b> where 'b: 'a`.
909 -----------------------
911 - [Rustc will now search for custom JSON targets in
912 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
913 directory.][83800] You can find your sysroot directory by running
914 `rustc --print sysroot`.
915 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
916 - [You can now use `#[target_feature]` on safe functions when targeting
917 WebAssembly platforms.][84988]
918 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
919 - [Added tier 3\* support for `bpfel-unknown-none`
920 and `bpfeb-unknown-none`.][79608]
921 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
923 \* Refer to Rust's [platform support page][platform-support-doc] for more
924 information on Rust's tiered platform support.
927 -----------------------
929 - [`panic::panic_any` will now `#[track_caller]`.][85745]
930 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
931 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
932 - [The implementations of vendor intrinsics in core::arch have been
933 significantly refactored.][83278] The main user-visible changes are
934 a 50% reduction in the size of libcore.rlib and stricter validation
935 of constant operands passed to intrinsics. The latter is technically
936 a breaking change, but allows Rust to more closely match the C vendor
942 - [`BTreeMap::into_keys`]
943 - [`BTreeMap::into_values`]
944 - [`HashMap::into_keys`]
945 - [`HashMap::into_values`]
947 - [`VecDeque::binary_search`]
948 - [`VecDeque::binary_search_by`]
949 - [`VecDeque::binary_search_by_key`]
950 - [`VecDeque::partition_point`]
955 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
956 the dependency graph.][cargo/9520]
957 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
958 in the tree ][cargo/9499]
959 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
960 macro dependencies.][cargo/9488]
961 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
962 This variable points to a directory that integration tests and benches
963 can use as a "scratchpad" for testing filesystem operations.
967 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
968 - [Previously unsound code is no longer permitted where different constructors in branches
969 could require different lifetimes.][85574]
970 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
971 than before and may reject some previously accepted code.
972 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
973 when compiled with `codegen-units = 1`.][86063]
975 [85574]: https://github.com/rust-lang/rust/issues/85574
976 [86831]: https://github.com/rust-lang/rust/issues/86831
977 [86063]: https://github.com/rust-lang/rust/issues/86063
978 [79608]: https://github.com/rust-lang/rust/pull/79608
979 [84988]: https://github.com/rust-lang/rust/pull/84988
980 [84701]: https://github.com/rust-lang/rust/pull/84701
981 [84072]: https://github.com/rust-lang/rust/pull/84072
982 [85745]: https://github.com/rust-lang/rust/pull/85745
983 [84744]: https://github.com/rust-lang/rust/pull/84744
984 [85078]: https://github.com/rust-lang/rust/pull/85078
985 [84717]: https://github.com/rust-lang/rust/pull/84717
986 [83800]: https://github.com/rust-lang/rust/pull/83800
987 [83366]: https://github.com/rust-lang/rust/pull/83366
988 [83278]: https://github.com/rust-lang/rust/pull/83278
989 [85292]: https://github.com/rust-lang/rust/pull/85292
990 [82834]: https://github.com/rust-lang/rust/pull/82834
991 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
992 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
993 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
994 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
995 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
996 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
997 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
998 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
999 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1000 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1001 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1003 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1005 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1007 Version 1.53.0 (2021-06-17)
1008 ============================
1011 -----------------------
1012 - [You can now use unicode for identifiers.][83799] This allows multilingual
1013 identifiers but still doesn't allow glyphs that are not considered characters
1014 such as `◆` or `🦀`. More specifically you can now use any identifier that
1015 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1016 is the same standard as languages like Python, however Rust uses NFC
1017 normalization which may be different from other languages.
1018 - [You can now specify "or patterns" inside pattern matches.][79278]
1019 Previously you could only use `|` (OR) on complete patterns. E.g.
1023 matches!(x, Some(1) | Some(2));
1025 matches!(x, Some(1 | 2));
1027 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1028 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1029 to change semantics to being a pattern fragment in a future edition.
1032 -----------------------
1033 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1034 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1035 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1037 \* Refer to Rust's [platform support page][platform-support-doc] for more
1038 information on Rust's tiered platform support.
1041 -----------------------
1042 - [Abort messages will now forward to `android_set_abort_message` on
1043 Android platforms when available.][81469]
1044 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1045 - [Arrays of any length now implement `IntoIterator`.][84147]
1046 Currently calling `.into_iter()` as a method on an array will
1047 return `impl Iterator<Item=&T>`, but this may change in a
1048 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1049 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1050 - [`leading_zeros`, and `trailing_zeros` are now available on all
1051 `NonZero` integer types.][84082]
1052 - [`{f32, f64}::from_str` now parse and print special values
1053 (`NaN`, `-0`) according to IEEE 754.][78618]
1054 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1055 - [Add the `BITS` associated constant to all numeric types.][82565]
1059 - [`AtomicBool::fetch_update`]
1060 - [`AtomicPtr::fetch_update`]
1061 - [`BTreeMap::retain`]
1062 - [`BTreeSet::retain`]
1063 - [`BufReader::seek_relative`]
1064 - [`DebugStruct::non_exhaustive`]
1066 - [`Duration::ZERO`]
1067 - [`Duration::is_zero`]
1068 - [`Duration::saturating_add`]
1069 - [`Duration::saturating_mul`]
1070 - [`Duration::saturating_sub`]
1071 - [`ErrorKind::Unsupported`]
1072 - [`Option::insert`]
1073 - [`Ordering::is_eq`]
1074 - [`Ordering::is_ge`]
1075 - [`Ordering::is_gt`]
1076 - [`Ordering::is_le`]
1077 - [`Ordering::is_lt`]
1078 - [`Ordering::is_ne`]
1079 - [`OsStr::is_ascii`]
1080 - [`OsStr::make_ascii_lowercase`]
1081 - [`OsStr::make_ascii_uppercase`]
1082 - [`OsStr::to_ascii_lowercase`]
1083 - [`OsStr::to_ascii_uppercase`]
1084 - [`Peekable::peek_mut`]
1085 - [`Rc::decrement_strong_count`]
1086 - [`Rc::increment_strong_count`]
1087 - [`Vec::extend_from_within`]
1088 - [`array::from_mut`]
1089 - [`array::from_ref`]
1090 - [`cmp::max_by_key`]
1092 - [`cmp::min_by_key`]
1094 - [`f32::is_subnormal`]
1095 - [`f64::is_subnormal`]
1098 -----------------------
1099 - [Cargo now supports git repositories where the default `HEAD` branch is not
1100 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1101 which can handle default branches correctly.
1102 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1103 - [The `authors` field is no longer included in `Cargo.toml` for new
1104 projects.][cargo/9282]
1107 -----------------------
1108 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1109 without hyperlinks.][81764]
1113 - [Implement token-based handling of attributes during expansion][82608]
1114 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1115 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1116 to confusion and potential security vulnerabilities and [is no
1117 longer recommended][ietf6943].
1118 - [The added `BITS` constant may conflict with external definitions.][85667]
1119 In particular, this was known to be a problem in the `lexical-core` crate,
1120 but they have published fixes for semantic versions 0.4 through 0.7. To
1121 update this dependency alone, use `cargo update -p lexical-core`.
1122 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1126 These changes provide no direct user facing benefits, but represent significant
1127 improvements to the internals and overall performance of rustc and
1130 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1131 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1132 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1133 - [Rework rustdoc const type][82873]
1135 [85667]: https://github.com/rust-lang/rust/pull/85667
1136 [83386]: https://github.com/rust-lang/rust/pull/83386
1137 [82771]: https://github.com/rust-lang/rust/pull/82771
1138 [84147]: https://github.com/rust-lang/rust/pull/84147
1139 [84082]: https://github.com/rust-lang/rust/pull/84082
1140 [83799]: https://github.com/rust-lang/rust/pull/83799
1141 [83681]: https://github.com/rust-lang/rust/pull/83681
1142 [83652]: https://github.com/rust-lang/rust/pull/83652
1143 [83387]: https://github.com/rust-lang/rust/pull/83387
1144 [82873]: https://github.com/rust-lang/rust/pull/82873
1145 [82864]: https://github.com/rust-lang/rust/pull/82864
1146 [82608]: https://github.com/rust-lang/rust/pull/82608
1147 [82565]: https://github.com/rust-lang/rust/pull/82565
1148 [80525]: https://github.com/rust-lang/rust/pull/80525
1149 [79278]: https://github.com/rust-lang/rust/pull/79278
1150 [78618]: https://github.com/rust-lang/rust/pull/78618
1151 [77704]: https://github.com/rust-lang/rust/pull/77704
1152 [83941]: https://github.com/rust-lang/rust/pull/83941
1153 [83065]: https://github.com/rust-lang/rust/pull/83065
1154 [81764]: https://github.com/rust-lang/rust/pull/81764
1155 [81469]: https://github.com/rust-lang/rust/pull/81469
1156 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1157 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1158 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1159 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1160 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1161 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1162 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1163 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1164 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1165 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1166 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1167 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1168 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1169 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1170 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1171 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1172 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1173 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1174 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1175 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1176 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1177 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1178 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1179 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1180 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1181 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1182 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1183 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1184 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1185 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1186 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1187 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1188 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1189 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1190 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1191 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1192 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1193 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1194 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1195 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1196 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1199 Version 1.52.1 (2021-05-10)
1200 ============================
1202 This release disables incremental compilation, unless the user has explicitly
1203 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1205 This is due to the widespread, and frequently occurring, breakage encountered by
1206 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1207 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1208 newly added incremental verification are still present in past stable versions,
1209 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1212 These problems only affect incremental builds, so release builds with Cargo
1213 should not be affected unless the user has explicitly opted into incremental.
1214 Debug and check builds are affected.
1216 See [84970] for more details.
1218 [84970]: https://github.com/rust-lang/rust/issues/84970
1220 Version 1.52.0 (2021-05-06)
1221 ============================
1225 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1226 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1227 is allowed by default, and may become a warning or hard error in a
1229 - [You can now cast mutable references to arrays to a pointer of the same type as
1230 the element.][81479]
1234 - [Upgraded the default LLVM to LLVM 12.][81451]
1236 Added tier 3\* support for the following targets.
1238 - [`s390x-unknown-linux-musl`][82166]
1239 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1240 - [`powerpc-unknown-openbsd`][82733]
1242 \* Refer to Rust's [platform support page][platform-support-doc] for more
1243 information on Rust's tiered platform support.
1247 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1248 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1249 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1250 - [All integer division and remainder operations are now `const`.][80962]
1254 - [`Arguments::as_str`]
1256 - [`char::REPLACEMENT_CHARACTER`]
1257 - [`char::UNICODE_VERSION`]
1258 - [`char::decode_utf16`]
1259 - [`char::from_digit`]
1260 - [`char::from_u32_unchecked`]
1261 - [`char::from_u32`]
1262 - [`slice::partition_point`]
1263 - [`str::rsplit_once`]
1264 - [`str::split_once`]
1266 The following previously stable APIs are now `const`.
1268 - [`char::len_utf8`]
1269 - [`char::len_utf16`]
1270 - [`char::to_ascii_uppercase`]
1271 - [`char::to_ascii_lowercase`]
1272 - [`char::eq_ignore_ascii_case`]
1273 - [`u8::to_ascii_uppercase`]
1274 - [`u8::to_ascii_lowercase`]
1275 - [`u8::eq_ignore_ascii_case`]
1279 - [Rustdoc lints are now treated as a tool lint, meaning that
1280 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1281 Using the old style is still allowed, and will become a warning in
1283 - [Rustdoc now supports argument files.][82261]
1284 - [Rustdoc now generates smart punctuation for documentation.][79423]
1285 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1293 - [You can now pass multiple filters to tests.][81356] E.g.
1294 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1295 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1296 allowing you to see `std` symbols when debugging.][82218]
1300 These changes provide no direct user facing benefits, but represent significant
1301 improvements to the internals and overall performance of rustc and
1304 - [Check the result cache before the DepGraph when ensuring queries][81855]
1305 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1306 - [Only store a LocalDefId in some HIR nodes][81611]
1307 - [Store HIR attributes in a side table][79519]
1311 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1312 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1313 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1314 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1315 languages in code blocks.][78429]
1316 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1317 - [Changes in how proc macros handle whitespace may lead to panics when used
1318 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1319 - [Turn `#[derive]` into a regular macro attribute][79078]
1321 [84136]: https://github.com/rust-lang/rust/issues/84136
1322 [80763]: https://github.com/rust-lang/rust/pull/80763
1323 [82166]: https://github.com/rust-lang/rust/pull/82166
1324 [82121]: https://github.com/rust-lang/rust/pull/82121
1325 [81879]: https://github.com/rust-lang/rust/pull/81879
1326 [82261]: https://github.com/rust-lang/rust/pull/82261
1327 [82218]: https://github.com/rust-lang/rust/pull/82218
1328 [82216]: https://github.com/rust-lang/rust/pull/82216
1329 [82202]: https://github.com/rust-lang/rust/pull/82202
1330 [81855]: https://github.com/rust-lang/rust/pull/81855
1331 [81766]: https://github.com/rust-lang/rust/pull/81766
1332 [81744]: https://github.com/rust-lang/rust/pull/81744
1333 [81611]: https://github.com/rust-lang/rust/pull/81611
1334 [81479]: https://github.com/rust-lang/rust/pull/81479
1335 [81451]: https://github.com/rust-lang/rust/pull/81451
1336 [81356]: https://github.com/rust-lang/rust/pull/81356
1337 [80962]: https://github.com/rust-lang/rust/pull/80962
1338 [80553]: https://github.com/rust-lang/rust/pull/80553
1339 [80527]: https://github.com/rust-lang/rust/pull/80527
1340 [79519]: https://github.com/rust-lang/rust/pull/79519
1341 [79423]: https://github.com/rust-lang/rust/pull/79423
1342 [79208]: https://github.com/rust-lang/rust/pull/79208
1343 [78429]: https://github.com/rust-lang/rust/pull/78429
1344 [82733]: https://github.com/rust-lang/rust/pull/82733
1345 [82594]: https://github.com/rust-lang/rust/pull/82594
1346 [79078]: https://github.com/rust-lang/rust/pull/79078
1347 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1348 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1349 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1350 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1351 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1352 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1353 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1354 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1355 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1356 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1357 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1358 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1359 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1360 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1361 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1362 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1363 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1364 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1365 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1366 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1367 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1368 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1370 Version 1.51.0 (2021-03-25)
1371 ============================
1375 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1376 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1377 E.g. you can now write the following. Note: Only values of primitive integers,
1378 `bool`, or `char` types are currently permitted.
1380 struct GenericArray<T, const LENGTH: usize> {
1384 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1385 const fn last(&self) -> Option<&T> {
1389 Some(&self.inner[LENGTH - 1])
1399 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1400 This option controls whether debug information is split across multiple files
1401 or packed into a single file. **Note** This option is unstable on other platforms.
1402 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1403 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1404 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1405 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1407 \* Refer to Rust's [platform support page][platform-support-doc] for more
1408 information on Rust's tiered platform support.
1413 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1414 - [`str` now implements `AsMut<str>`.][80279]
1415 - [`u64` and `u128` now implement `From<char>`.][79502]
1416 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1417 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1418 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1419 - [`io::Empty` now implements `io::Seek`.][78044]
1420 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1421 `T: ?Sized` types.][80764]
1422 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1428 - [`Arc::decrement_strong_count`]
1429 - [`Arc::increment_strong_count`]
1430 - [`Once::call_once_force`]
1431 - [`Peekable::next_if_eq`]
1432 - [`Peekable::next_if`]
1433 - [`Seek::stream_position`]
1434 - [`array::IntoIter`]
1435 - [`panic::panic_any`]
1437 - [`ptr::addr_of_mut!`]
1438 - [`slice::fill_with`]
1439 - [`slice::split_inclusive_mut`]
1440 - [`slice::split_inclusive`]
1441 - [`slice::strip_prefix`]
1442 - [`slice::strip_suffix`]
1443 - [`str::split_inclusive`]
1444 - [`sync::OnceState`]
1446 - [`VecDeque::range`]
1447 - [`VecDeque::range_mut`]
1451 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1452 codegen option.][cargo/9112]
1453 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1454 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1455 to avoid unifying features of dependencies where that unification could be unwanted.
1456 Such as using the same dependency with a `std` feature in a build scripts and
1457 proc-macros, while using the `no-std` feature in the final binary. See the
1458 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1463 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1464 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1465 documentation.][79642]
1467 Various improvements to intra-doc links:
1469 - [You can link to non-path primitives such as `slice`.][80181]
1470 - [You can link to associated items.][74489]
1471 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1475 - [You can now pass `--include-ignored` to tests (e.g. with
1476 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1481 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1482 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1484 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1485 for the distributed artifacts.][81521]
1486 - `armv5te-unknown-linux-gnueabi`
1487 - `sparc64-unknown-linux-gnu`
1488 - `thumbv7neon-unknown-linux-gnueabihf`
1489 - `armv7-unknown-linux-gnueabi`
1490 - `x86_64-unknown-linux-gnux32`
1491 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1496 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1498 [79135]: https://github.com/rust-lang/rust/pull/79135
1499 [74489]: https://github.com/rust-lang/rust/pull/74489
1500 [76934]: https://github.com/rust-lang/rust/pull/76934
1501 [79570]: https://github.com/rust-lang/rust/pull/79570
1502 [80181]: https://github.com/rust-lang/rust/pull/80181
1503 [79642]: https://github.com/rust-lang/rust/pull/79642
1504 [80945]: https://github.com/rust-lang/rust/pull/80945
1505 [80279]: https://github.com/rust-lang/rust/pull/80279
1506 [80053]: https://github.com/rust-lang/rust/pull/80053
1507 [79502]: https://github.com/rust-lang/rust/pull/79502
1508 [75180]: https://github.com/rust-lang/rust/pull/75180
1509 [81521]: https://github.com/rust-lang/rust/pull/81521
1510 [80968]: https://github.com/rust-lang/rust/pull/80968
1511 [80959]: https://github.com/rust-lang/rust/pull/80959
1512 [80718]: https://github.com/rust-lang/rust/pull/80718
1513 [80653]: https://github.com/rust-lang/rust/pull/80653
1514 [80579]: https://github.com/rust-lang/rust/pull/80579
1515 [79998]: https://github.com/rust-lang/rust/pull/79998
1516 [78044]: https://github.com/rust-lang/rust/pull/78044
1517 [81455]: https://github.com/rust-lang/rust/pull/81455
1518 [80764]: https://github.com/rust-lang/rust/pull/80764
1519 [80749]: https://github.com/rust-lang/rust/pull/80749
1520 [80662]: https://github.com/rust-lang/rust/pull/80662
1521 [79134]: https://github.com/rust-lang/rust/pull/79134
1522 [80966]: https://github.com/rust-lang/rust/pull/80966
1523 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1524 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1525 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1526 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1527 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1528 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1529 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1530 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1531 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1532 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1533 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1534 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1535 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1536 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1537 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1538 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1539 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1540 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1541 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1542 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1543 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1544 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1545 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1547 Version 1.50.0 (2021-02-11)
1548 ============================
1551 -----------------------
1552 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1553 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1554 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1557 -----------------------
1558 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1559 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1560 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1561 - [Dropped support for all cloudabi targets.][78439]
1563 \* Refer to Rust's [platform support page][platform-support-doc] for more
1564 information on Rust's tiered platform support.
1567 -----------------------
1569 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1570 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1571 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1572 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1573 up the same amount of space as `File`.
1579 - [`btree_map::Entry::or_insert_with_key`]
1582 - [`hash_map::Entry::or_insert_with_key`]
1586 - [`UnsafeCell::get_mut`]
1588 The following previously stable methods are now `const`.
1590 - [`IpAddr::is_ipv4`]
1591 - [`IpAddr::is_ipv6`]
1592 - [`IpAddr::is_unspecified`]
1593 - [`IpAddr::is_loopback`]
1594 - [`IpAddr::is_multicast`]
1595 - [`Ipv4Addr::octets`]
1596 - [`Ipv4Addr::is_loopback`]
1597 - [`Ipv4Addr::is_private`]
1598 - [`Ipv4Addr::is_link_local`]
1599 - [`Ipv4Addr::is_multicast`]
1600 - [`Ipv4Addr::is_broadcast`]
1601 - [`Ipv4Addr::is_documentation`]
1602 - [`Ipv4Addr::to_ipv6_compatible`]
1603 - [`Ipv4Addr::to_ipv6_mapped`]
1604 - [`Ipv6Addr::segments`]
1605 - [`Ipv6Addr::is_unspecified`]
1606 - [`Ipv6Addr::is_loopback`]
1607 - [`Ipv6Addr::is_multicast`]
1608 - [`Ipv6Addr::to_ipv4`]
1611 - [`Layout::from_size_align`]
1612 - `pow` for all integer types.
1613 - `checked_pow` for all integer types.
1614 - `saturating_pow` for all integer types.
1615 - `wrapping_pow` for all integer types.
1616 - `next_power_of_two` for all unsigned integer types.
1617 - `checked_next_power_of_two` for all unsigned integer types.
1620 -----------------------
1622 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1623 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1624 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1625 contents of that directory for changes.][cargo/8973]
1626 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1631 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1632 - [Running tests will now print the total time taken to execute.][75752]
1637 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1638 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1639 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1640 unhygenic `macro_rules!` macros.][79472]
1641 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1642 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1643 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1644 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1645 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1646 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1648 [74989]: https://github.com/rust-lang/rust/pull/74989
1649 [79261]: https://github.com/rust-lang/rust/pull/79261
1650 [79896]: https://github.com/rust-lang/rust/pull/79896
1651 [79484]: https://github.com/rust-lang/rust/pull/79484
1652 [79472]: https://github.com/rust-lang/rust/pull/79472
1653 [79270]: https://github.com/rust-lang/rust/pull/79270
1654 [79003]: https://github.com/rust-lang/rust/pull/79003
1655 [78864]: https://github.com/rust-lang/rust/pull/78864
1656 [78636]: https://github.com/rust-lang/rust/pull/78636
1657 [78439]: https://github.com/rust-lang/rust/pull/78439
1658 [78343]: https://github.com/rust-lang/rust/pull/78343
1659 [78296]: https://github.com/rust-lang/rust/pull/78296
1660 [78068]: https://github.com/rust-lang/rust/pull/78068
1661 [75752]: https://github.com/rust-lang/rust/pull/75752
1662 [74699]: https://github.com/rust-lang/rust/pull/74699
1663 [78142]: https://github.com/rust-lang/rust/pull/78142
1664 [77484]: https://github.com/rust-lang/rust/pull/77484
1665 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1666 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1667 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1668 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1669 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1670 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1671 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1672 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1673 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1674 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1675 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1676 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1677 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1678 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1679 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1680 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1681 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1682 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1683 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1684 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1685 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1686 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1687 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1688 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1689 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1690 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1691 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1692 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1693 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1694 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
1695 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1696 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1697 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
1698 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1701 Version 1.49.0 (2020-12-31)
1702 ============================
1705 -----------------------
1707 - [Unions can now implement `Drop`, and you can now have a field in a union
1708 with `ManuallyDrop<T>`.][77547]
1709 - [You can now cast uninhabited enums to integers.][76199]
1710 - [You can now bind by reference and by move in patterns.][76119] This
1711 allows you to selectively borrow individual components of a type. E.g.
1719 let person = Person {
1720 name: String::from("Alice"),
1724 // `name` is moved out of person, but `age` is referenced.
1725 let Person { name, ref age } = person;
1726 println!("{} {}", name, age);
1730 -----------------------
1732 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1733 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1734 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1735 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1736 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1737 - [Output from threads spawned in tests is now captured.][78227]
1738 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1740 \* Refer to Rust's [platform support page][platform-support-doc] for more
1741 information on Rust's tiered platform support.
1744 -----------------------
1746 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1747 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1752 - [`slice::select_nth_unstable`]
1753 - [`slice::select_nth_unstable_by`]
1754 - [`slice::select_nth_unstable_by_key`]
1756 The following previously stable methods are now `const`.
1758 - [`Poll::is_ready`]
1759 - [`Poll::is_pending`]
1762 -----------------------
1763 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1764 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1765 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1766 variable will be set if the crate being built is one the user selected to build, either
1767 with `-p` or through defaults.
1768 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1774 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1775 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1776 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1777 Previously such invalid or unused attributes could be ignored.
1778 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1779 read [this post about the changes][rustdoc-ws-post] for more details.
1780 - [Trait bounds are no longer inferred for associated types.][79904]
1784 These changes provide no direct user facing benefits, but represent significant
1785 improvements to the internals and overall performance of rustc and
1788 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1789 Local Storage model.][78201]
1790 - [Calculate visibilities once in resolve.][78077]
1791 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1792 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1795 [75991]: https://github.com/rust-lang/rust/pull/75991
1796 [78951]: https://github.com/rust-lang/rust/pull/78951
1797 [78848]: https://github.com/rust-lang/rust/pull/78848
1798 [78746]: https://github.com/rust-lang/rust/pull/78746
1799 [78376]: https://github.com/rust-lang/rust/pull/78376
1800 [78228]: https://github.com/rust-lang/rust/pull/78228
1801 [78227]: https://github.com/rust-lang/rust/pull/78227
1802 [78201]: https://github.com/rust-lang/rust/pull/78201
1803 [78109]: https://github.com/rust-lang/rust/pull/78109
1804 [78077]: https://github.com/rust-lang/rust/pull/78077
1805 [77997]: https://github.com/rust-lang/rust/pull/77997
1806 [77703]: https://github.com/rust-lang/rust/pull/77703
1807 [77547]: https://github.com/rust-lang/rust/pull/77547
1808 [77015]: https://github.com/rust-lang/rust/pull/77015
1809 [76199]: https://github.com/rust-lang/rust/pull/76199
1810 [76119]: https://github.com/rust-lang/rust/pull/76119
1811 [75914]: https://github.com/rust-lang/rust/pull/75914
1812 [79004]: https://github.com/rust-lang/rust/pull/79004
1813 [78676]: https://github.com/rust-lang/rust/pull/78676
1814 [79904]: https://github.com/rust-lang/rust/issues/79904
1815 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1816 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1817 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1818 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1819 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1820 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1821 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1822 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1823 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1824 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1826 Version 1.48.0 (2020-11-19)
1827 ==========================
1832 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1833 is still rejected *semantically*, but can now be parsed by procedural macros.
1837 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1838 `rustc` whether to link its own C runtime and libraries or to rely on a external
1839 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1840 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1841 Note: If you're using cargo you must explicitly pass the `--target` flag.
1842 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1844 \* Refer to Rust's [platform support page][platform-support-doc] for more
1845 information on Rust's tiered platform support.
1849 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1850 and `&Stderr`.][76275]
1851 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1852 - [The `matches!` macro now supports having a trailing comma.][74880]
1853 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1854 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1858 - [`slice::as_ptr_range`]
1859 - [`slice::as_mut_ptr_range`]
1860 - [`VecDeque::make_contiguous`]
1861 - [`future::pending`]
1864 The following previously stable methods are now `const fn`'s:
1866 - [`Option::is_some`]
1867 - [`Option::is_none`]
1868 - [`Option::as_ref`]
1870 - [`Result::is_err`]
1871 - [`Result::as_ref`]
1872 - [`Ordering::reverse`]
1873 - [`Ordering::then`]
1880 - [You can now link to items in `rustdoc` using the intra-doc link
1881 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1882 a link to `std::future`'s documentation. See ["Linking to items by
1883 name"][intradoc-links] for more information.
1884 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1885 when searching through `rustdoc`'s UI.][75740]
1889 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1890 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1891 promoted to `'static` lifetime any more inside `const fn`s.
1892 - [Associated type bindings on trait objects are now verified to meet the bounds
1893 declared on the trait when checking that they implement the trait.][27675]
1894 - [When trait bounds on associated types or opaque types are ambiguous, the
1895 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1896 - [Fixed recursive nonterminals not being expanded in macros during
1897 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1898 correctly handling recursive nonterminal tokens.
1899 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1900 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1901 in places where they have no effect.][73461]
1902 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1903 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1904 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1905 disallow zero-initialization.][71274]
1906 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1907 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1908 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1909 see the [`catch_unwind`] documentation for further information.
1915 These changes provide no direct user facing benefits, but represent significant
1916 improvements to the internals and overall performance of rustc and
1919 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1920 You can continue building with `make` by setting `ninja=false` in
1922 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1923 - [Made `ensure_sufficient_stack()` non-generic][76680]
1925 [78143]: https://github.com/rust-lang/rust/issues/78143
1926 [76680]: https://github.com/rust-lang/rust/pull/76680/
1927 [76030]: https://github.com/rust-lang/rust/pull/76030/
1928 [70212]: https://github.com/rust-lang/rust/pull/70212/
1929 [27675]: https://github.com/rust-lang/rust/issues/27675/
1930 [54121]: https://github.com/rust-lang/rust/issues/54121/
1931 [71274]: https://github.com/rust-lang/rust/pull/71274/
1932 [77386]: https://github.com/rust-lang/rust/pull/77386/
1933 [77153]: https://github.com/rust-lang/rust/pull/77153/
1934 [77055]: https://github.com/rust-lang/rust/pull/77055/
1935 [76275]: https://github.com/rust-lang/rust/pull/76275/
1936 [76310]: https://github.com/rust-lang/rust/pull/76310/
1937 [76420]: https://github.com/rust-lang/rust/pull/76420/
1938 [76158]: https://github.com/rust-lang/rust/pull/76158/
1939 [75857]: https://github.com/rust-lang/rust/pull/75857/
1940 [75585]: https://github.com/rust-lang/rust/pull/75585/
1941 [75740]: https://github.com/rust-lang/rust/pull/75740/
1942 [75502]: https://github.com/rust-lang/rust/pull/75502/
1943 [74880]: https://github.com/rust-lang/rust/pull/74880/
1944 [74922]: https://github.com/rust-lang/rust/pull/74922/
1945 [74430]: https://github.com/rust-lang/rust/pull/74430/
1946 [74194]: https://github.com/rust-lang/rust/pull/74194/
1947 [73461]: https://github.com/rust-lang/rust/pull/73461/
1948 [73166]: https://github.com/rust-lang/rust/pull/73166/
1949 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1950 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1951 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1952 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1953 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1954 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1955 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1956 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1957 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1958 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1959 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1960 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1961 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1962 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1963 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1966 Version 1.47.0 (2020-10-08)
1967 ==========================
1971 - [Closures will now warn when not used.][74869]
1975 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1976 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1978 - [Upgraded to LLVM 11.][73526]
1979 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1980 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1981 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1983 \* Refer to Rust's [platform support page][platform-support-doc] for more
1984 information on Rust's tiered platform support.
1988 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1989 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1990 those of length less than 33.][74060]
1991 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1992 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1993 `PartialEq`, and `PartialOrd`.][73583]
1997 - [`Ident::new_raw`]
1998 - [`Range::is_empty`]
1999 - [`RangeInclusive::is_empty`]
2000 - [`Result::as_deref`]
2001 - [`Result::as_deref_mut`]
2003 - [`pointer::offset_from`]
2007 The following previously stable APIs have now been made const.
2009 - [The `new` method for all `NonZero` integers.][73858]
2010 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2011 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2012 methods for all integers.][73858]
2013 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2014 signed integers.][73858]
2015 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2016 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2017 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2018 `is_ascii_control` methods for `char` and `u8`.][73858]
2022 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2023 You can override this by setting the following in your `Cargo.toml`.
2025 [profile.release.build-override]
2028 - [`cargo-help` will now display man pages for commands rather just the
2029 `--help` text.][cargo/8456]
2030 - [`cargo-metadata` now emits a `test` field indicating if a target has
2031 tests enabled.][cargo/8478]
2032 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2033 - [`cargo-publish` will now use an alternative registry by default if it's the
2034 only registry specified in `package.publish`.][cargo/8571]
2038 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2039 type based search.][75366]
2040 - [Added the Ayu theme to rustdoc.][71237]
2044 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2045 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2046 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2047 help to preserve more span information.][73084] These changes may cause
2048 compiliation errors if your macro was unhygenic or didn't correctly handle
2050 - [Moved support for the CloudABI target to tier 3.][75568]
2051 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2052 - [Added the `rustc-docs` component.][75560] This allows you to install
2053 and read the documentation for the compiler internal APIs. (Currently only
2054 available for `x86_64-unknown-linux-gnu`.)
2059 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
2061 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2062 [75048]: https://github.com/rust-lang/rust/pull/75048/
2063 [74163]: https://github.com/rust-lang/rust/pull/74163/
2064 [71237]: https://github.com/rust-lang/rust/pull/71237/
2065 [74869]: https://github.com/rust-lang/rust/pull/74869/
2066 [73858]: https://github.com/rust-lang/rust/pull/73858/
2067 [75716]: https://github.com/rust-lang/rust/pull/75716/
2068 [75560]: https://github.com/rust-lang/rust/pull/75560/
2069 [75568]: https://github.com/rust-lang/rust/pull/75568/
2070 [75366]: https://github.com/rust-lang/rust/pull/75366/
2071 [75204]: https://github.com/rust-lang/rust/pull/75204/
2072 [74650]: https://github.com/rust-lang/rust/pull/74650/
2073 [74419]: https://github.com/rust-lang/rust/pull/74419/
2074 [73964]: https://github.com/rust-lang/rust/pull/73964/
2075 [74021]: https://github.com/rust-lang/rust/pull/74021/
2076 [74060]: https://github.com/rust-lang/rust/pull/74060/
2077 [73893]: https://github.com/rust-lang/rust/pull/73893/
2078 [73526]: https://github.com/rust-lang/rust/pull/73526/
2079 [73583]: https://github.com/rust-lang/rust/pull/73583/
2080 [73084]: https://github.com/rust-lang/rust/pull/73084/
2081 [73197]: https://github.com/rust-lang/rust/pull/73197/
2082 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2083 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2084 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2085 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2086 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2087 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2088 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2089 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2090 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2091 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2092 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2093 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2094 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2095 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2098 Version 1.46.0 (2020-08-27)
2099 ==========================
2103 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2104 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2105 const functions.][73862]
2106 - [The `#[track_caller]` attribute can now be added to functions to use the
2107 function's caller's location information for panic messages.][72445]
2108 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2109 `x.0.0` over `(x.0).0`.
2110 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2111 You currently can't use `mem::transmute` in constant functions.
2115 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2116 - [Enabled static "Position Independent Executables" by default
2117 for `x86_64-unknown-linux-musl`.][70740]
2121 - [`mem::forget` is now a `const fn`.][73887]
2122 - [`String` now implements `From<char>`.][73466]
2123 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2124 integer types.][73032]
2125 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2126 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2127 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2128 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2129 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2130 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2135 - [`vec::Drain::as_slice`]
2139 Added a number of new environment variables that are now available when
2140 compiling your crate.
2142 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2143 the specific binary being compiled and the name of the crate.
2144 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2145 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2149 - [The target configuration option `abi_blacklist` has been renamed
2150 to `unsupported_abis`.][74150] The old name will still continue to work.
2151 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2152 This was previously accepted but will become a hard error in a future release.
2153 - [Rustc will fail to compile if you have a struct with
2154 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2156 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2157 ensure that spans have the correct information, and may cause breakage if you
2158 were relying on receiving spans with dummy information.
2159 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2160 a legacy installer that was replaced by a MSI installer a few years ago but
2161 was still being built.
2162 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2163 - [Rustc will no longer accept overlapping trait implementations that only
2164 differ in how the lifetime was bound.][72493]
2165 - [Rustc now correctly relates the lifetime of an existential associated
2166 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2167 you to pass a shorter lifetime than expected.
2168 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2169 The library will need to be installed for `rustc` to work, even though we
2170 expect it to be already available on most systems.
2171 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2173 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2174 exact output returned by rustc's pretty printing is an unstable
2175 implementation detail: we recommend any macro relying on it to switch to a
2176 more robust parsing system.
2178 [75453]: https://github.com/rust-lang/rust/issues/75453/
2179 [74820]: https://github.com/rust-lang/rust/issues/74820/
2180 [74420]: https://github.com/rust-lang/rust/issues/74420/
2181 [74109]: https://github.com/rust-lang/rust/pull/74109/
2182 [74150]: https://github.com/rust-lang/rust/pull/74150/
2183 [73862]: https://github.com/rust-lang/rust/pull/73862/
2184 [73887]: https://github.com/rust-lang/rust/pull/73887/
2185 [73466]: https://github.com/rust-lang/rust/pull/73466/
2186 [73516]: https://github.com/rust-lang/rust/pull/73516/
2187 [73293]: https://github.com/rust-lang/rust/pull/73293/
2188 [73007]: https://github.com/rust-lang/rust/pull/73007/
2189 [73032]: https://github.com/rust-lang/rust/pull/73032/
2190 [72920]: https://github.com/rust-lang/rust/pull/72920/
2191 [72569]: https://github.com/rust-lang/rust/pull/72569/
2192 [72583]: https://github.com/rust-lang/rust/pull/72583/
2193 [72584]: https://github.com/rust-lang/rust/pull/72584/
2194 [72717]: https://github.com/rust-lang/rust/pull/72717/
2195 [72437]: https://github.com/rust-lang/rust/pull/72437/
2196 [72445]: https://github.com/rust-lang/rust/pull/72445/
2197 [72486]: https://github.com/rust-lang/rust/pull/72486/
2198 [72493]: https://github.com/rust-lang/rust/pull/72493/
2199 [72331]: https://github.com/rust-lang/rust/pull/72331/
2200 [71896]: https://github.com/rust-lang/rust/pull/71896/
2201 [71660]: https://github.com/rust-lang/rust/pull/71660/
2202 [71322]: https://github.com/rust-lang/rust/pull/71322/
2203 [70740]: https://github.com/rust-lang/rust/pull/70740/
2204 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2205 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2206 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2207 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2208 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2211 Version 1.45.2 (2020-08-03)
2212 ==========================
2214 * [Fix bindings in tuple struct patterns][74954]
2215 * [Fix track_caller integration with trait objects][74784]
2217 [74954]: https://github.com/rust-lang/rust/issues/74954
2218 [74784]: https://github.com/rust-lang/rust/issues/74784
2221 Version 1.45.1 (2020-07-30)
2222 ==========================
2224 * [Fix const propagation with references.][73613]
2225 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2226 * [Avoid spurious implicit region bound.][74509]
2227 * [Install clippy on x.py install][74457]
2229 [73613]: https://github.com/rust-lang/rust/pull/73613
2230 [73078]: https://github.com/rust-lang/rust/issues/73078
2231 [74509]: https://github.com/rust-lang/rust/pull/74509
2232 [74457]: https://github.com/rust-lang/rust/pull/74457
2235 Version 1.45.0 (2020-07-16)
2236 ==========================
2240 - [Out of range float to int conversions using `as` has been defined as a saturating
2241 conversion.][71269] This was previously undefined behaviour, but you can use the
2242 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2243 may be desirable in rare performance sensitive situations.
2244 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2245 using `u64`.][70705]
2246 - [Function like procedural macros can now be used in expression, pattern, and statement
2247 positions.][68717] This means you can now use a function-like procedural macro
2248 anywhere you can use a declarative (`macro_rules!`) macro.
2252 - [You can now override individual target features through the `target-feature`
2253 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2254 equivalent to `-C target-feature=+avx2,+fma`.
2255 - [Added the `force-unwind-tables` flag.][69984] This option allows
2256 rustc to always generate unwind tables regardless of panic strategy.
2257 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2258 to include LLVM bitcode into generated `rlib`s (this is on by default).
2259 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2260 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2261 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2262 - [Upgraded to LLVM 10.][67759]
2264 \* Refer to Rust's [platform support page][platform-support-doc] for more
2265 information on Rust's tiered platform support.
2270 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2272 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2273 - [You can now use `char` with
2274 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2275 a range of codepoints.][72413] E.g.
2276 you can now write the following;
2278 for ch in 'a'..='z' {
2282 // Prints "abcdefghijklmnopqrstuvwxyz"
2284 - [`OsString` now implements `FromStr`.][71662]
2285 - [The `saturating_neg` method has been added to all signed integer primitive
2286 types, and the `saturating_abs` method has been added for all integer
2287 primitive types.][71886]
2288 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2289 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2291 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2292 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2293 integer types.][69813]
2294 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2295 integer types.][72324]
2296 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2301 - [`BTreeMap::remove_entry`]
2303 - [`rc::Weak::as_ptr`]
2304 - [`rc::Weak::from_raw`]
2305 - [`rc::Weak::into_raw`]
2306 - [`str::strip_prefix`]
2307 - [`str::strip_suffix`]
2308 - [`sync::Weak::as_ptr`]
2309 - [`sync::Weak::from_raw`]
2310 - [`sync::Weak::into_raw`]
2311 - [`char::UNICODE_VERSION`]
2312 - [`Span::resolved_at`]
2313 - [`Span::located_at`]
2314 - [`Span::mixed_site`]
2315 - [`unix::process::CommandExt::arg0`]
2320 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2325 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2326 `~~outdated information~~` becomes "~~outdated information~~".
2327 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2331 - [Trying to self initialize a static value (that is creating a value using
2332 itself) is unsound and now causes a compile error.][71140]
2333 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2334 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2335 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2336 previously undocumented and not intended for public use. Rustdoc still provides
2337 a non-zero exit code on errors.
2338 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2339 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2340 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2341 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2342 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2346 - [Make clippy a git subtree instead of a git submodule][70655]
2347 - [Unify the undo log of all snapshot types][69464]
2349 [71848]: https://github.com/rust-lang/rust/issues/71848/
2350 [73420]: https://github.com/rust-lang/rust/issues/73420/
2351 [72324]: https://github.com/rust-lang/rust/pull/72324/
2352 [71843]: https://github.com/rust-lang/rust/pull/71843/
2353 [71886]: https://github.com/rust-lang/rust/pull/71886/
2354 [72234]: https://github.com/rust-lang/rust/pull/72234/
2355 [72239]: https://github.com/rust-lang/rust/pull/72239/
2356 [72397]: https://github.com/rust-lang/rust/pull/72397/
2357 [72413]: https://github.com/rust-lang/rust/pull/72413/
2358 [72014]: https://github.com/rust-lang/rust/pull/72014/
2359 [72062]: https://github.com/rust-lang/rust/pull/72062/
2360 [72094]: https://github.com/rust-lang/rust/pull/72094/
2361 [72133]: https://github.com/rust-lang/rust/pull/72133/
2362 [67759]: https://github.com/rust-lang/rust/pull/67759/
2363 [71900]: https://github.com/rust-lang/rust/pull/71900/
2364 [71928]: https://github.com/rust-lang/rust/pull/71928/
2365 [71662]: https://github.com/rust-lang/rust/pull/71662/
2366 [71716]: https://github.com/rust-lang/rust/pull/71716/
2367 [71447]: https://github.com/rust-lang/rust/pull/71447/
2368 [71269]: https://github.com/rust-lang/rust/pull/71269/
2369 [71095]: https://github.com/rust-lang/rust/pull/71095/
2370 [71140]: https://github.com/rust-lang/rust/pull/71140/
2371 [70655]: https://github.com/rust-lang/rust/pull/70655/
2372 [70705]: https://github.com/rust-lang/rust/pull/70705/
2373 [69984]: https://github.com/rust-lang/rust/pull/69984/
2374 [69813]: https://github.com/rust-lang/rust/pull/69813/
2375 [69464]: https://github.com/rust-lang/rust/pull/69464/
2376 [68717]: https://github.com/rust-lang/rust/pull/68717/
2377 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2378 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2379 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2380 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2381 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2382 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2383 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2384 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2385 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2386 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2387 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2388 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2389 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2390 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2391 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2392 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2393 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2396 Version 1.44.1 (2020-06-18)
2397 ===========================
2399 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2400 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2401 * [Fix crashes when finding backtrace on macOS.][71397]
2402 * [Clippy applies lint levels into different files.][clippy/5356]
2404 [71397]: https://github.com/rust-lang/rust/issues/71397
2405 [73078]: https://github.com/rust-lang/rust/issues/73078
2406 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2407 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2410 Version 1.44.0 (2020-06-04)
2411 ==========================
2415 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2416 - [Added the `unused_braces` lint.][70081]
2418 **Syntax-only changes**
2420 - [Expansion-driven outline module parsing][69838]
2425 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2430 These are still rejected semantically, so you will likely receive an error but
2431 these changes can be seen and parsed by macros and conditional compilation.
2435 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2436 Additionally when in incremental mode rustc defaults to 256 codegen units.
2437 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2438 a panic is thrown.][67502]
2439 - [Added tier 3\* support for the `aarch64-unknown-none` and
2440 `aarch64-unknown-none-softfloat` targets.][68334]
2441 - [Added tier 3 support for `arm64-apple-tvos` and
2442 `x86_64-apple-tvos` targets.][68191]
2447 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2448 `vec![]` to be able to be used in `const` contexts.
2449 - [`convert::Infallible` now implements `Hash`.][70281]
2450 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2451 a `&mut OsStr`.][70048]
2452 - [Unicode 13 is now supported.][69929]
2453 - [`String` now implements `From<&mut str>`.][69661]
2454 - [`IoSlice` now implements `Copy`.][69403]
2455 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2456 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2457 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2458 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2459 integer types.][69373]
2463 - [`PathBuf::with_capacity`]
2464 - [`PathBuf::capacity`]
2465 - [`PathBuf::clear`]
2466 - [`PathBuf::reserve`]
2467 - [`PathBuf::reserve_exact`]
2468 - [`PathBuf::shrink_to_fit`]
2469 - [`f32::to_int_unchecked`]
2470 - [`f64::to_int_unchecked`]
2471 - [`Layout::align_to`]
2472 - [`Layout::pad_to_align`]
2474 - [`Layout::extend`]
2478 - [Added the `cargo tree` command which will print a tree graph of
2479 your dependencies.][cargo/8062] E.g.
2481 mdbook v0.3.2 (/Users/src/rust/mdbook)
2483 │ ├── html5ever v0.24.0
2485 │ │ │ └── cfg-if v0.1.9
2487 │ │ └── markup5ever v0.9.0
2488 │ │ ├── log v0.4.8 (*)
2490 │ │ │ └── phf_shared v0.7.24
2491 │ │ │ ├── siphasher v0.2.3
2492 │ │ │ └── unicase v1.4.2
2493 │ │ │ [build-dependencies]
2494 │ │ │ └── version_check v0.1.5
2497 You can also display dependencies on multiple versions of the same crate with
2498 `cargo tree -d` (short for `cargo tree --duplicates`).
2502 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2503 the version in the sidebar.][69494]
2507 - [Rustc now correctly generates static libraries on Windows GNU targets with
2508 the `.a` extension, rather than the previous `.lib`.][70937]
2509 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2510 - [The `file_name` property in JSON output of macro errors now points the actual
2511 source file rather than the previous format of `<NAME macros>`.][70969]
2512 **Note:** this may not point to a file that actually exists on the user's system.
2513 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2514 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2515 not allow zero initialization such as `NonZeroU8`.][66059] This was
2516 previously a warning.
2517 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2518 operator has been defined as a saturating operation.][71269] This was previously
2519 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2520 continue using the current behaviour, which may be desirable in rare performance
2521 sensitive situations.
2525 These changes provide no direct user facing benefits, but represent significant
2526 improvements to the internals and overall performance of rustc and
2529 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2530 - [Replace big JS dict with JSON parsing.][71250]
2532 [69373]: https://github.com/rust-lang/rust/pull/69373/
2533 [66059]: https://github.com/rust-lang/rust/pull/66059/
2534 [68191]: https://github.com/rust-lang/rust/pull/68191/
2535 [68899]: https://github.com/rust-lang/rust/pull/68899/
2536 [71147]: https://github.com/rust-lang/rust/pull/71147/
2537 [71250]: https://github.com/rust-lang/rust/pull/71250/
2538 [70937]: https://github.com/rust-lang/rust/pull/70937/
2539 [70969]: https://github.com/rust-lang/rust/pull/70969/
2540 [70632]: https://github.com/rust-lang/rust/pull/70632/
2541 [70281]: https://github.com/rust-lang/rust/pull/70281/
2542 [70345]: https://github.com/rust-lang/rust/pull/70345/
2543 [70048]: https://github.com/rust-lang/rust/pull/70048/
2544 [70081]: https://github.com/rust-lang/rust/pull/70081/
2545 [70156]: https://github.com/rust-lang/rust/pull/70156/
2546 [71269]: https://github.com/rust-lang/rust/pull/71269/
2547 [69838]: https://github.com/rust-lang/rust/pull/69838/
2548 [69929]: https://github.com/rust-lang/rust/pull/69929/
2549 [69661]: https://github.com/rust-lang/rust/pull/69661/
2550 [69778]: https://github.com/rust-lang/rust/pull/69778/
2551 [69494]: https://github.com/rust-lang/rust/pull/69494/
2552 [69403]: https://github.com/rust-lang/rust/pull/69403/
2553 [69033]: https://github.com/rust-lang/rust/pull/69033/
2554 [68692]: https://github.com/rust-lang/rust/pull/68692/
2555 [68334]: https://github.com/rust-lang/rust/pull/68334/
2556 [67502]: https://github.com/rust-lang/rust/pull/67502/
2557 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2558 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2559 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2560 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2561 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2562 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2563 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2564 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2565 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2566 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2567 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2568 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2569 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2572 Version 1.43.1 (2020-05-07)
2573 ===========================
2575 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2576 * [Fixed the stabilization of AVX-512 features.][71473]
2577 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2579 [71430]: https://github.com/rust-lang/rust/pull/71430
2580 [71473]: https://github.com/rust-lang/rust/issues/71473
2581 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2584 Version 1.43.0 (2020-04-23)
2585 ==========================
2589 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2590 the type inferred correctly.][68129]
2591 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2593 **Syntax only changes**
2594 - [Allow `type Foo: Ord` syntactically.][69361]
2595 - [Fuse associated and extern items up to defaultness.][69194]
2596 - [Syntactically allow `self` in all `fn` contexts.][68764]
2597 - [Merge `fn` syntax + cleanup item parsing.][68728]
2598 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2599 For example, you may now write:
2601 macro_rules! mac_trait {
2611 These are still rejected *semantically*, so you will likely receive an error but
2612 these changes can be seen and parsed by macros and
2613 conditional compilation.
2618 - [You can now pass multiple lint flags to rustc to override the previous
2619 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2620 everything in the `unused` lint group except `unused-variables` which
2621 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2622 everything in the `unused` lint group **including** `unused-variables` since
2623 the allow flag is specified before the deny flag (and therefore overridden).
2624 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2625 if they are available on `windows-gnu`.][67429]
2626 - [rustc now buffers errors/warnings printed in JSON.][69227]
2630 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2631 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2632 respectively.][69538] **Note** These conversions are only available when `N`
2634 - [You can now use associated constants on floats and integers directly, rather
2635 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2636 `f32::NAN` with no imports.
2637 - [`u8::is_ascii` is now `const`.][68984]
2638 - [`String` now implements `AsMut<str>`.][68742]
2639 - [Added the `primitive` module to `std` and `core`.][67637] This module
2640 reexports Rust's primitive types. This is mainly useful in macros
2641 where you want avoid these types being shadowed.
2642 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2643 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2647 - [`Once::is_completed`]
2652 - [`iter::once_with`]
2656 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2657 your environment.][cargo/7823]
2658 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2659 executable path when running integration tests or benchmarks.][cargo/7697]
2660 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2661 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2665 - [Certain checks in the `const_err` lint were deemed unrelated to const
2666 evaluation][69185], and have been moved to the `unconditional_panic` and
2667 `arithmetic_overflow` lints.
2672 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2673 has been a warning since 1.36.0.
2674 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2675 led to some instances being accepted, and now correctly emits a hard error.
2677 [69340]: https://github.com/rust-lang/rust/pull/69340
2681 These changes provide no direct user facing benefits, but represent significant
2682 improvements to the internals and overall performance of `rustc` and
2685 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2686 - [Improved how rustc generates drop code.][67332]
2687 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2688 - [traits: preallocate 2 Vecs of known initial size][69022]
2689 - [Avoid exponential behaviour when relating types][68772]
2690 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2691 - [Improve performance of coherence checks][68966]
2692 - [Deduplicate types in the generator witness][68672]
2693 - [Invert control in struct_lint_level.][68725]
2695 [67332]: https://github.com/rust-lang/rust/pull/67332/
2696 [67429]: https://github.com/rust-lang/rust/pull/67429/
2697 [67637]: https://github.com/rust-lang/rust/pull/67637/
2698 [67642]: https://github.com/rust-lang/rust/pull/67642/
2699 [67878]: https://github.com/rust-lang/rust/pull/67878/
2700 [67885]: https://github.com/rust-lang/rust/pull/67885/
2701 [68129]: https://github.com/rust-lang/rust/pull/68129/
2702 [68672]: https://github.com/rust-lang/rust/pull/68672/
2703 [68725]: https://github.com/rust-lang/rust/pull/68725/
2704 [68728]: https://github.com/rust-lang/rust/pull/68728/
2705 [68738]: https://github.com/rust-lang/rust/pull/68738/
2706 [68742]: https://github.com/rust-lang/rust/pull/68742/
2707 [68764]: https://github.com/rust-lang/rust/pull/68764/
2708 [68772]: https://github.com/rust-lang/rust/pull/68772/
2709 [68943]: https://github.com/rust-lang/rust/pull/68943/
2710 [68952]: https://github.com/rust-lang/rust/pull/68952/
2711 [68966]: https://github.com/rust-lang/rust/pull/68966/
2712 [68984]: https://github.com/rust-lang/rust/pull/68984/
2713 [69022]: https://github.com/rust-lang/rust/pull/69022/
2714 [69185]: https://github.com/rust-lang/rust/pull/69185/
2715 [69194]: https://github.com/rust-lang/rust/pull/69194/
2716 [69201]: https://github.com/rust-lang/rust/pull/69201/
2717 [69227]: https://github.com/rust-lang/rust/pull/69227/
2718 [69548]: https://github.com/rust-lang/rust/pull/69548/
2719 [69256]: https://github.com/rust-lang/rust/pull/69256/
2720 [69361]: https://github.com/rust-lang/rust/pull/69361/
2721 [69366]: https://github.com/rust-lang/rust/pull/69366/
2722 [69538]: https://github.com/rust-lang/rust/pull/69538/
2723 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2724 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2725 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2726 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2727 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2728 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2729 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2730 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2733 Version 1.42.0 (2020-03-12)
2734 ==========================
2738 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2740 fn foo(words: &[&str]) {
2742 ["Hello", "World", "!", ..] => println!("Hello World!"),
2743 ["Foo", "Bar", ..] => println!("Baz"),
2744 rest => println!("{:?}", rest),
2748 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2749 that you can create an enum that has the exact layout and ABI of the type
2751 - [You can now use outer attribute procedural macros on inline modules.][64273]
2752 - [There are some *syntax-only* changes:][67131]
2753 - `default` is syntactically allowed before items in `trait` definitions.
2754 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2755 leave out their bodies in favor of `;`.
2756 - Bounds on associated types in `impl`s are now syntactically allowed
2757 (e.g. `type Foo: Ord;`).
2758 - `...` (the C-variadic type) may occur syntactically directly as the type of
2759 any function parameter.
2761 These are still rejected *semantically*, so you will likely receive an error
2762 but these changes can be seen and parsed by procedural macros and
2763 conditional compilation.
2767 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2768 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2769 - [`Option::{expect,unwrap}` and
2770 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2771 pointing to the location where they were called, rather than
2772 `core`'s internals. ][67887]
2774 \* Refer to Rust's [platform support page][platform-support-doc] for more
2775 information on Rust's tiered platform support.
2779 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2780 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2781 to implement `Sized`.][67935]
2782 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2783 - [`Layout::new` is now `const`.][66254]
2784 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2789 - [`CondVar::wait_while`]
2790 - [`CondVar::wait_timeout_while`]
2792 - [`DebugMap::value`]
2793 - [`ManuallyDrop::take`]
2795 - [`ptr::slice_from_raw_parts_mut`]
2796 - [`ptr::slice_from_raw_parts`]
2800 - [You no longer need to include `extern crate proc_macro;` to be able to
2801 `use proc_macro;` in the `2018` edition.][cargo/7700]
2805 - [`Error::description` has been deprecated, and its use will now produce a
2806 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2808 [68253]: https://github.com/rust-lang/rust/pull/68253/
2809 [68348]: https://github.com/rust-lang/rust/pull/68348/
2810 [67935]: https://github.com/rust-lang/rust/pull/67935/
2811 [68339]: https://github.com/rust-lang/rust/pull/68339/
2812 [68122]: https://github.com/rust-lang/rust/pull/68122/
2813 [64273]: https://github.com/rust-lang/rust/pull/64273/
2814 [67712]: https://github.com/rust-lang/rust/pull/67712/
2815 [67887]: https://github.com/rust-lang/rust/pull/67887/
2816 [67131]: https://github.com/rust-lang/rust/pull/67131/
2817 [67233]: https://github.com/rust-lang/rust/pull/67233/
2818 [66899]: https://github.com/rust-lang/rust/pull/66899/
2819 [66919]: https://github.com/rust-lang/rust/pull/66919/
2820 [66254]: https://github.com/rust-lang/rust/pull/66254/
2821 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2822 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2823 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2824 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2825 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2826 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2827 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2828 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2829 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2832 Version 1.41.1 (2020-02-27)
2833 ===========================
2835 * [Always check types of static items][69145]
2836 * [Always check lifetime bounds of `Copy` impls][69145]
2837 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2839 [69225]: https://github.com/rust-lang/rust/issues/69225
2840 [69145]: https://github.com/rust-lang/rust/pull/69145
2843 Version 1.41.0 (2020-01-30)
2844 ===========================
2849 - [You can now pass type parameters to foreign items when implementing
2850 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2851 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2852 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2853 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2854 - [You can now use any valid identifier in a `format_args` macro.][66847]
2855 Previously identifiers starting with an underscore were not allowed.
2856 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2857 enum variants.][66183] These are still rejected semantically, but
2858 can be seen and parsed by procedural macros and conditional compilation.
2859 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2860 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2861 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2863 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2868 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2869 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2870 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2871 - [You can now pass an arguments file passing the `@path` syntax
2872 to rustc.][66172] Note that the format differs somewhat from what is
2873 found in other tooling; please see [the documentation][argfile-docs] for
2875 - [You can now provide `--extern` flag without a path, indicating that it is
2876 available from the search path or specified with an `-L` flag.][64882]
2878 \* Refer to Rust's [platform support page][platform-support-doc] for more
2879 information on Rust's tiered platform support.
2881 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2886 - [The `core::panic` module is now stable.][66771] It was already stable
2888 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2889 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2890 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2895 - [`Result::map_or`]
2896 - [`Result::map_or_else`]
2897 - [`std::rc::Weak::weak_count`]
2898 - [`std::rc::Weak::strong_count`]
2899 - [`std::sync::Weak::weak_count`]
2900 - [`std::sync::Weak::strong_count`]
2905 - [Cargo will now document all the private items for binary crates
2906 by default.][cargo/7593]
2907 - [`cargo-install` will now reinstall the package if it detects that it is out
2908 of date.][cargo/7560]
2909 - [Cargo.lock now uses a more git friendly format that should help to reduce
2910 merge conflicts.][cargo/7579]
2911 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2912 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2913 optimisation level to `2` for debug builds. You can also use
2914 `[profile.<profile>.build-override]` to override build scripts and
2920 - [You can now specify `edition` in documentation code blocks to compile the block
2921 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2922 should be compiled the 2018 edition of Rust.
2923 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2924 current theme with `--check-theme`.][54733]
2925 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2930 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2931 Apple targets.][apple-32bit-drop] This means that the source code is still
2932 available to build, but the targets are no longer being tested and release
2933 binaries for those platforms will no longer be distributed by the Rust project.
2934 Please refer to the linked blog post for more information.
2936 [54733]: https://github.com/rust-lang/rust/pull/54733/
2937 [61351]: https://github.com/rust-lang/rust/pull/61351/
2938 [62514]: https://github.com/rust-lang/rust/pull/62514/
2939 [67255]: https://github.com/rust-lang/rust/pull/67255/
2940 [66661]: https://github.com/rust-lang/rust/pull/66661/
2941 [66771]: https://github.com/rust-lang/rust/pull/66771/
2942 [66847]: https://github.com/rust-lang/rust/pull/66847/
2943 [66238]: https://github.com/rust-lang/rust/pull/66238/
2944 [66277]: https://github.com/rust-lang/rust/pull/66277/
2945 [66325]: https://github.com/rust-lang/rust/pull/66325/
2946 [66172]: https://github.com/rust-lang/rust/pull/66172/
2947 [66183]: https://github.com/rust-lang/rust/pull/66183/
2948 [65879]: https://github.com/rust-lang/rust/pull/65879/
2949 [65013]: https://github.com/rust-lang/rust/pull/65013/
2950 [64882]: https://github.com/rust-lang/rust/pull/64882/
2951 [64325]: https://github.com/rust-lang/rust/pull/64325/
2952 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2953 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2954 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2955 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2956 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2957 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2958 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2959 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2960 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2961 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2962 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2964 Version 1.40.0 (2019-12-19)
2965 ===========================
2969 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2970 `const` contexts.][65188] e.g.
2973 pub struct Point(i32, i32);
2975 const ORIGIN: Point = {
2976 let constructor = Point;
2982 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2983 indicate that there may be variants or fields added in the future.][64639]
2984 For example this requires adding a wild-card branch (`_ => {}`) to any match
2985 statements on a non-exhaustive `enum`. [(RFC 2008)]
2986 - [You can now use function-like procedural macros in `extern` blocks and in
2987 type positions.][63931] e.g. `type Generated = macro!();`
2988 - [Function-like and attribute procedural macros can now emit
2989 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2990 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2991 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2992 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2996 - [Added tier 3 support\* for the
2997 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2998 - [Added tier 3 support for the
2999 `aarch64-unknown-none-softfloat` target.][64589]
3000 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3001 `mips64el-unknown-linux-muslabi64` targets.][65843]
3003 \* Refer to Rust's [platform support page][platform-support-doc] for more
3004 information on Rust's tiered platform support.
3008 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3012 - [`BTreeMap::get_key_value`]
3013 - [`HashMap::get_key_value`]
3014 - [`Option::as_deref_mut`]
3015 - [`Option::as_deref`]
3016 - [`Option::flatten`]
3017 - [`UdpSocket::peer_addr`]
3018 - [`f32::to_be_bytes`]
3019 - [`f32::to_le_bytes`]
3020 - [`f32::to_ne_bytes`]
3021 - [`f64::to_be_bytes`]
3022 - [`f64::to_le_bytes`]
3023 - [`f64::to_ne_bytes`]
3024 - [`f32::from_be_bytes`]
3025 - [`f32::from_le_bytes`]
3026 - [`f32::from_ne_bytes`]
3027 - [`f64::from_be_bytes`]
3028 - [`f64::from_le_bytes`]
3029 - [`f64::from_ne_bytes`]
3036 - [Cargo will now always display warnings, rather than only on
3037 fresh builds.][cargo/7450]
3038 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3039 now produce an error.][cargo/7507] Previously these flags were ignored.
3040 - [You can now publish `dev-dependencies` without including
3041 a `version`.][cargo/7333]
3045 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3046 when running documentation tests with `rustdoc`.][63803]
3050 - [As previously announced, any previous NLL warnings in the 2015 edition are
3051 now hard errors.][64221]
3052 - [The `include!` macro will now warn if it failed to include the
3053 entire file.][64284] The `include!` macro unintentionally only includes the
3054 first _expression_ in a file, and this can be unintuitive. This will become
3055 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3056 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3057 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3058 or `extern` blocks now correctly emits a hard error.
3060 [65294]: https://github.com/rust-lang/rust/pull/65294/
3061 [66103]: https://github.com/rust-lang/rust/pull/66103/
3062 [65843]: https://github.com/rust-lang/rust/pull/65843/
3063 [65188]: https://github.com/rust-lang/rust/pull/65188/
3064 [65092]: https://github.com/rust-lang/rust/pull/65092/
3065 [64589]: https://github.com/rust-lang/rust/pull/64589/
3066 [64639]: https://github.com/rust-lang/rust/pull/64639/
3067 [64221]: https://github.com/rust-lang/rust/pull/64221/
3068 [64284]: https://github.com/rust-lang/rust/pull/64284/
3069 [63931]: https://github.com/rust-lang/rust/pull/63931/
3070 [64035]: https://github.com/rust-lang/rust/pull/64035/
3071 [63674]: https://github.com/rust-lang/rust/pull/63674/
3072 [63803]: https://github.com/rust-lang/rust/pull/63803/
3073 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3074 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3075 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3076 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3077 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3078 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3079 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3080 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3081 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3082 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3083 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3084 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3085 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3086 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3087 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3088 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3089 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3090 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3091 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3092 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3093 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3094 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3095 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3096 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3097 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3100 Version 1.39.0 (2019-11-07)
3101 ===========================
3105 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3106 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3107 - [You can now use certain attributes on function, closure, and function pointer
3108 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3109 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3110 attributes applied to items. e.g.
3113 #[cfg(windows)] slice: &[u16],
3114 #[cfg(not(windows))] slice: &[u8],
3119 - [You can now take shared references to bind-by-move patterns in the `if` guards
3120 of `match` arms.][63118] e.g.
3123 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3127 // ---- `nums` is bound by move.
3128 if nums.iter().sum::<u8>() == 10
3129 // ^------ `.iter()` implicitly takes a reference to `nums`.
3132 // ----------- Legal as `nums` was bound by move and so we have ownership.
3134 _ => unreachable!(),
3143 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3144 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3145 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3146 **Note** Cargo currently doesn't use this feature. Refer to
3147 [cargo#7315][cargo/7315] to track this feature's progress.
3148 - [You can now pass `--show-output` argument to test binaries to print the
3149 output of successful tests.][62600]
3152 \* Refer to Rust's [platform support page][platform-support-doc] for more
3153 information on Rust's tiered platform support.
3157 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3158 - [`LinkedList::new` is now a `const` function.][63684]
3159 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3160 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3161 now `const`.][63786]
3165 - [`Pin::into_inner`]
3166 - [`Instant::checked_duration_since`]
3167 - [`Instant::saturating_duration_since`]
3171 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3172 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3173 `--all` is now deprecated.
3177 - [You can now pass `-Clinker` to rustdoc to control the linker used
3178 for compiling doctests.][63834]
3182 - [Code that was previously accepted by the old borrow checker, but rejected by
3183 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3184 previously a warning, and will also become a hard error in the Rust 2015
3185 edition in the 1.40.0 release.
3186 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3187 run tests.][63827] This should improve performance when running a large
3189 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3190 recommended to use the `?` operator instead.
3191 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3194 [62600]: https://github.com/rust-lang/rust/pull/62600/
3195 [62672]: https://github.com/rust-lang/rust/pull/62672/
3196 [63118]: https://github.com/rust-lang/rust/pull/63118/
3197 [63209]: https://github.com/rust-lang/rust/pull/63209/
3198 [63402]: https://github.com/rust-lang/rust/pull/63402/
3199 [63565]: https://github.com/rust-lang/rust/pull/63565/
3200 [63595]: https://github.com/rust-lang/rust/pull/63595/
3201 [63684]: https://github.com/rust-lang/rust/pull/63684/
3202 [63698]: https://github.com/rust-lang/rust/pull/63698/
3203 [63770]: https://github.com/rust-lang/rust/pull/63770/
3204 [63786]: https://github.com/rust-lang/rust/pull/63786/
3205 [63827]: https://github.com/rust-lang/rust/pull/63827/
3206 [63834]: https://github.com/rust-lang/rust/pull/63834/
3207 [64010]: https://github.com/rust-lang/rust/pull/64010/
3208 [64028]: https://github.com/rust-lang/rust/pull/64028/
3209 [64334]: https://github.com/rust-lang/rust/pull/64334/
3210 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3211 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3212 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3213 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3214 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3215 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3217 Version 1.38.0 (2019-09-26)
3218 ==========================
3222 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3223 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3227 - [Added pipelined compilation support to `rustc`.][62766] This will
3228 improve compilation times in some cases. For further information please refer
3229 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3230 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3231 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3232 `x86_64-uwp-windows-msvc` targets.][60260]
3233 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3234 `armv7-unknown-linux-musleabi` targets.][63107]
3235 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3236 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3237 - [Upgraded to LLVM 9.][62592]
3239 \* Refer to Rust's [platform support page][platform-support-doc] for more
3240 information on Rust's tiered platform support.
3244 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3245 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3246 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3247 is available at `std::clone::Clone`). This also makes all built-in macros
3248 available in `std`/`core` root. e.g. `std::include_bytes!`.
3249 - [`str::Chars` now implements `Debug`.][63000]
3250 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3251 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3252 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3253 - [Added euclidean remainder and division operations (`div_euclid`,
3254 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3255 `overflowing`, and `wrapping` versions are available for all
3257 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3258 `PartialEq`.][61491]
3259 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3263 - [`<*const T>::cast`]
3264 - [`<*mut T>::cast`]
3265 - [`Duration::as_secs_f32`]
3266 - [`Duration::as_secs_f64`]
3267 - [`Duration::div_f32`]
3268 - [`Duration::div_f64`]
3269 - [`Duration::from_secs_f32`]
3270 - [`Duration::from_secs_f64`]
3271 - [`Duration::mul_f32`]
3272 - [`Duration::mul_f64`]
3273 - [`any::type_name`]
3277 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3278 - [You can now pass the `--features` option multiple times to enable
3279 multiple features.][cargo/7084]
3284 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3288 - [`rustc` will now warn about some incorrect uses of
3289 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3293 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3295 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3296 issues][62896] with certain crates such as libc.
3298 [60260]: https://github.com/rust-lang/rust/pull/60260/
3299 [61457]: https://github.com/rust-lang/rust/pull/61457/
3300 [61491]: https://github.com/rust-lang/rust/pull/61491/
3301 [61884]: https://github.com/rust-lang/rust/pull/61884/
3302 [61953]: https://github.com/rust-lang/rust/pull/61953/
3303 [62042]: https://github.com/rust-lang/rust/pull/62042/
3304 [62528]: https://github.com/rust-lang/rust/pull/62528/
3305 [62583]: https://github.com/rust-lang/rust/pull/62583/
3306 [62735]: https://github.com/rust-lang/rust/pull/62735/
3307 [62766]: https://github.com/rust-lang/rust/pull/62766/
3308 [62784]: https://github.com/rust-lang/rust/pull/62784/
3309 [62592]: https://github.com/rust-lang/rust/pull/62592/
3310 [62785]: https://github.com/rust-lang/rust/issues/62785/
3311 [62814]: https://github.com/rust-lang/rust/pull/62814/
3312 [62896]: https://github.com/rust-lang/rust/issues/62896/
3313 [63000]: https://github.com/rust-lang/rust/pull/63000/
3314 [63056]: https://github.com/rust-lang/rust/pull/63056/
3315 [63107]: https://github.com/rust-lang/rust/pull/63107/
3316 [63346]: https://github.com/rust-lang/rust/pull/63346/
3317 [63421]: https://github.com/rust-lang/rust/pull/63421/
3318 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3319 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3320 [63048]: https://github.com/rust-lang/rust/pull/63048
3321 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3322 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3323 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3324 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3325 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3326 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3327 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3328 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3329 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3330 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3331 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3332 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3333 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3335 Version 1.37.0 (2019-08-15)
3336 ==========================
3340 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3341 [`Box`][62228], or an [array][62235] and unused.
3342 - [You can now use the `cfg` and `cfg_attr` attributes on
3343 generic parameters.][61547]
3344 - [You can now use enum variants through type alias.][61682] e.g. You can
3345 write the following:
3347 type MyOption = Option<u8>;
3349 fn increment_or_zero(x: MyOption) -> u8 {
3351 MyOption::Some(y) => y + 1,
3352 MyOption::None => 0,
3356 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3357 `const _: u32 = 5;`.
3358 - [You can now use `#[repr(align(X)]` on enums.][61229]
3359 - [The `?` Kleene macro operator is now available in the
3360 2015 edition.][60932]
3364 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3365 and `-C profile-use` flags.][61268] For more information on how to use profile
3366 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3367 - [The `rust-lldb` wrapper script should now work again.][61827]
3371 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3375 - [`BufReader::buffer`]
3376 - [`BufWriter::buffer`]
3377 - [`Cell::from_mut`]
3378 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3379 - [`DoubleEndedIterator::nth_back`]
3381 - [`Wrapping::reverse_bits`]
3382 - [`i128::reverse_bits`]
3383 - [`i16::reverse_bits`]
3384 - [`i32::reverse_bits`]
3385 - [`i64::reverse_bits`]
3386 - [`i8::reverse_bits`]
3387 - [`isize::reverse_bits`]
3388 - [`slice::copy_within`]
3389 - [`u128::reverse_bits`]
3390 - [`u16::reverse_bits`]
3391 - [`u32::reverse_bits`]
3392 - [`u64::reverse_bits`]
3393 - [`u8::reverse_bits`]
3394 - [`usize::reverse_bits`]
3398 - [`Cargo.lock` files are now included by default when publishing executable crates
3399 with executables.][cargo/7026]
3400 - [You can now specify `default-run="foo"` in `[package]` to specify the
3401 default executable to use for `cargo run`.][cargo/7056]
3408 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3409 Please transition your code to using the `..=` syntax for inclusive
3411 - [Using a trait object without the `dyn` will now warn by default.][61203]
3412 Please transition your code to use `dyn Trait` for trait objects instead.
3414 [62228]: https://github.com/rust-lang/rust/pull/62228/
3415 [62235]: https://github.com/rust-lang/rust/pull/62235/
3416 [61802]: https://github.com/rust-lang/rust/pull/61802/
3417 [61827]: https://github.com/rust-lang/rust/pull/61827/
3418 [61547]: https://github.com/rust-lang/rust/pull/61547/
3419 [61682]: https://github.com/rust-lang/rust/pull/61682/
3420 [61268]: https://github.com/rust-lang/rust/pull/61268/
3421 [61342]: https://github.com/rust-lang/rust/pull/61342/
3422 [61347]: https://github.com/rust-lang/rust/pull/61347/
3423 [61100]: https://github.com/rust-lang/rust/pull/61100/
3424 [61203]: https://github.com/rust-lang/rust/pull/61203/
3425 [61229]: https://github.com/rust-lang/rust/pull/61229/
3426 [60932]: https://github.com/rust-lang/rust/pull/60932/
3427 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3428 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3429 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3430 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3431 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3432 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3433 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3434 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3435 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3436 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3437 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3438 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3439 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3440 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3441 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3442 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3443 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3444 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3445 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3446 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3447 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3448 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3449 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3452 Version 1.36.0 (2019-07-04)
3453 ==========================
3457 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3458 - [The order of traits in trait objects no longer affects the semantics of that
3459 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3460 `dyn fmt::Debug + Send`, where this was previously not the case.
3464 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3465 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3466 - [`mem::needs_drop` is now available as a const fn.][60364]
3467 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3468 - [`String` now implements `BorrowMut<str>`.][60404]
3469 - [`io::Cursor` now implements `Default`.][60234]
3470 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3471 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3472 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3473 environment has access to heap memory allocation.
3474 - [`String` now implements `From<&String>`.][59825]
3475 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3476 return a tuple of each argument when there is multiple arguments.
3477 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3482 - [`VecDeque::rotate_left`]
3483 - [`VecDeque::rotate_right`]
3484 - [`Iterator::copied`]
3486 - [`io::IoSliceMut`]
3487 - [`Read::read_vectored`]
3488 - [`Write::write_vectored`]
3489 - [`str::as_mut_ptr`]
3490 - [`mem::MaybeUninit`]
3491 - [`pointer::align_offset`]
3492 - [`future::Future`]
3494 - [`task::RawWaker`]
3495 - [`task::RawWakerVTable`]
3501 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3502 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3504 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3508 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3515 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3516 longer recommended, and will be deprecated in 1.39.0.
3518 [60318]: https://github.com/rust-lang/rust/pull/60318/
3519 [60364]: https://github.com/rust-lang/rust/pull/60364/
3520 [60370]: https://github.com/rust-lang/rust/pull/60370/
3521 [60404]: https://github.com/rust-lang/rust/pull/60404/
3522 [60234]: https://github.com/rust-lang/rust/pull/60234/
3523 [60244]: https://github.com/rust-lang/rust/pull/60244/
3524 [58623]: https://github.com/rust-lang/rust/pull/58623/
3525 [59648]: https://github.com/rust-lang/rust/pull/59648/
3526 [59675]: https://github.com/rust-lang/rust/pull/59675/
3527 [59825]: https://github.com/rust-lang/rust/pull/59825/
3528 [59826]: https://github.com/rust-lang/rust/pull/59826/
3529 [59445]: https://github.com/rust-lang/rust/pull/59445/
3530 [59114]: https://github.com/rust-lang/rust/pull/59114/
3531 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3532 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3533 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3534 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3535 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3536 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3537 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3538 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3539 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3540 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3541 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3542 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3543 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3544 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3545 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3546 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3547 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3548 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3549 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3550 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3553 Version 1.35.0 (2019-05-23)
3554 ==========================
3558 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3559 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3560 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3562 unsafe fn call_unsafe(func: unsafe fn()) {
3567 unsafe { call_unsafe(|| {}); }
3574 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3575 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3576 - [Added the `wasm32-unknown-wasi` target.][59464]
3581 - [`Thread` will now show its ID in `Debug` output.][59460]
3582 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3583 - [`alloc::System` now implements `Default`.][59451]
3584 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3586 - [`char::{ToLowercase, ToUppercase}` now
3587 implement `ExactSizeIterator`.][58778]
3588 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3589 - [Removed the `Read` trait bounds
3590 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3591 - [You can now call the `dbg!` macro without any parameters to print the file
3592 and line where it is called.][57847]
3593 - [In place ASCII case conversions are now up to 4× faster.][59283]
3594 e.g. `str::make_ascii_lowercase`
3595 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3602 - [`RefCell::replace_with`]
3603 - [`RefCell::map_split`]
3605 - [`Range::contains`]
3606 - [`RangeFrom::contains`]
3607 - [`RangeTo::contains`]
3608 - [`RangeInclusive::contains`]
3609 - [`RangeToInclusive::contains`]
3610 - [`Option::copied`]
3614 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3615 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3620 - [The Rust toolchain is now available natively for musl based distros.][58575]
3622 [59460]: https://github.com/rust-lang/rust/pull/59460/
3623 [59464]: https://github.com/rust-lang/rust/pull/59464/
3624 [59500]: https://github.com/rust-lang/rust/pull/59500/
3625 [59512]: https://github.com/rust-lang/rust/pull/59512/
3626 [59580]: https://github.com/rust-lang/rust/pull/59580/
3627 [59283]: https://github.com/rust-lang/rust/pull/59283/
3628 [59451]: https://github.com/rust-lang/rust/pull/59451/
3629 [59076]: https://github.com/rust-lang/rust/pull/59076/
3630 [58778]: https://github.com/rust-lang/rust/pull/58778/
3631 [58717]: https://github.com/rust-lang/rust/pull/58717/
3632 [58369]: https://github.com/rust-lang/rust/pull/58369/
3633 [58423]: https://github.com/rust-lang/rust/pull/58423/
3634 [58080]: https://github.com/rust-lang/rust/pull/58080/
3635 [57847]: https://github.com/rust-lang/rust/pull/57847/
3636 [58575]: https://github.com/rust-lang/rust/pull/58575
3637 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3638 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3639 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3640 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3641 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3642 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3643 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3644 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3645 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3646 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3647 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3648 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3650 Version 1.34.2 (2019-05-14)
3651 ===========================
3653 * [Destabilize the `Error::type_id` function due to a security
3654 vulnerability][60785] ([CVE-2019-12083])
3656 [60785]: https://github.com/rust-lang/rust/pull/60785
3657 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3659 Version 1.34.1 (2019-04-25)
3660 ===========================
3662 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3663 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3664 * [Fix Clippy panic when checking some macros][clippy/3805]
3666 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3667 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3668 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3670 Version 1.34.0 (2019-04-11)
3671 ==========================
3675 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3676 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3678 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3679 `#[attr{}]` procedural macros.][57367]
3680 - [You can now write `extern crate self as foo;`][57407] to import your
3681 crate's root into the extern prelude.
3686 - [You can now target `riscv64imac-unknown-none-elf` and
3687 `riscv64gc-unknown-none-elf`.][58406]
3688 - [You can now enable linker plugin LTO optimisations with
3689 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3690 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3692 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3697 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3698 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3699 the `Hash` trait to create an iterator.
3700 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3701 methods.][58421] Most notably you no longer require the `Ord` trait to create
3703 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3704 for all numeric types.][58044]
3705 - [Indexing a `str` is now generic over all types that
3706 implement `SliceIndex<str>`.][57604]
3707 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3708 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3709 produce a warning if their returning type is unused.
3710 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3711 `overflowing_pow` are now available for all numeric types.][57873] These are
3712 equivalent to methods such as `wrapping_add` for the `pow` operation.
3720 * [`Error::type_id`]
3721 * [`atomic::AtomicI16`]
3722 * [`atomic::AtomicI32`]
3723 * [`atomic::AtomicI64`]
3724 * [`atomic::AtomicI8`]
3725 * [`atomic::AtomicU16`]
3726 * [`atomic::AtomicU32`]
3727 * [`atomic::AtomicU64`]
3728 * [`atomic::AtomicU8`]
3729 * [`convert::Infallible`]
3730 * [`convert::TryFrom`]
3731 * [`convert::TryInto`]
3733 * [`iter::successors`]
3734 * [`num::NonZeroI128`]
3735 * [`num::NonZeroI16`]
3736 * [`num::NonZeroI32`]
3737 * [`num::NonZeroI64`]
3738 * [`num::NonZeroI8`]
3739 * [`num::NonZeroIsize`]
3740 * [`slice::sort_by_cached_key`]
3741 * [`str::escape_debug`]
3742 * [`str::escape_default`]
3743 * [`str::escape_unicode`]
3744 * [`str::split_ascii_whitespace`]
3747 * [`Instant::checked_add`]
3748 * [`Instant::checked_sub`]
3749 * [`SystemTime::checked_add`]
3750 * [`SystemTime::checked_sub`]
3754 - [You can now use alternative registries to crates.io.][cargo/6654]
3758 - [You can now use the `?` operator in your documentation tests without manually
3759 adding `fn main() -> Result<(), _> {}`.][56470]
3763 - [`Command::before_exec` is being replaced by the unsafe method
3764 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3765 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3766 can now use `const` functions in `static` variables.
3768 [58370]: https://github.com/rust-lang/rust/pull/58370/
3769 [58406]: https://github.com/rust-lang/rust/pull/58406/
3770 [58421]: https://github.com/rust-lang/rust/pull/58421/
3771 [58166]: https://github.com/rust-lang/rust/pull/58166/
3772 [58044]: https://github.com/rust-lang/rust/pull/58044/
3773 [58057]: https://github.com/rust-lang/rust/pull/58057/
3774 [58059]: https://github.com/rust-lang/rust/pull/58059/
3775 [57809]: https://github.com/rust-lang/rust/pull/57809/
3776 [57873]: https://github.com/rust-lang/rust/pull/57873/
3777 [57604]: https://github.com/rust-lang/rust/pull/57604/
3778 [57367]: https://github.com/rust-lang/rust/pull/57367/
3779 [57407]: https://github.com/rust-lang/rust/pull/57407/
3780 [57425]: https://github.com/rust-lang/rust/pull/57425/
3781 [57106]: https://github.com/rust-lang/rust/pull/57106/
3782 [56470]: https://github.com/rust-lang/rust/pull/56470/
3783 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3784 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3785 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3786 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3787 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3788 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3789 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3790 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3791 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3792 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3793 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3794 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3795 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3796 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3797 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3798 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3799 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3800 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3801 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3802 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3803 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3804 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3805 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3806 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3807 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3808 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3809 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3810 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3811 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3812 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3813 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3816 Version 1.33.0 (2019-02-28)
3817 ==========================
3821 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3822 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3823 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3824 E.g. You can have match statement on a `u8` that covers `0..=255` and
3825 you would no longer be required to have a `_ => unreachable!()` case.
3826 - [You can now have multiple patterns in `if let` and `while let`
3827 expressions.][57532] You can do this with the same syntax as a `match`
3837 let state = Creature::Crab("Ferris");
3839 if let Creature::Crab(name) | Creature::Person(name) = state {
3840 println!("This creature's name is: {}", name);
3844 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3845 this feature will by default produce a warning as this behaviour can be
3846 unintuitive. E.g. `if let _ = 5 {}`
3847 - [You can now use `let` bindings, assignments, expression statements,
3848 and irrefutable pattern destructuring in const functions.][57175]
3849 - [You can now call unsafe const functions.][57067] E.g.
3851 const unsafe fn foo() -> i32 { 5 }
3852 const fn bar() -> i32 {
3856 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3857 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3858 - [You can now specify a specific alignment with the `#[repr(packed)]`
3859 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3860 with an alignment of 2 bytes and a size of 6 bytes.
3861 - [You can now import an item from a module as an `_`.][56303] This allows you to
3862 import a trait's impls, and not have the name in the namespace. E.g.
3864 use std::io::Read as _;
3866 // Allowed as there is only one `Read` in the module.
3869 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3873 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3874 command line argument.][56351]
3875 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3876 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3877 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3878 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3879 information on Rust's platform support.
3880 - [Added support for the `thumbv7neon-linux-androideabi` and
3881 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3882 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3886 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3887 functions for all numeric types.][57566]
3888 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3889 are now `const` functions for all numeric types.][57105]
3890 - [The methods `is_positive` and `is_negative` are now `const` functions for
3891 all signed numeric types.][57105]
3892 - [The `get` method for all `NonZero` types is now `const`.][57167]
3893 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3894 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3895 numeric types.][57234]
3896 - [`Ipv4Addr::new` is now a `const` function][57234]
3900 - [`unix::FileExt::read_exact_at`]
3901 - [`unix::FileExt::write_all_at`]
3902 - [`Option::transpose`]
3903 - [`Result::transpose`]
3904 - [`convert::identity`]
3907 - [`marker::PhantomPinned`]
3908 - [`Vec::resize_with`]
3909 - [`VecDeque::resize_with`]
3910 - [`Duration::as_millis`]
3911 - [`Duration::as_micros`]
3912 - [`Duration::as_nanos`]
3917 - [You can now publish crates that require a feature flag to compile with
3918 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3919 - [Cargo should now rebuild a crate if a file was modified during the initial
3924 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3925 are now deprecated in the standard library, and their usage will now produce a warning.
3926 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3928 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3930 - [Libtest no longer creates a new thread for each test when
3931 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3933 [56243]: https://github.com/rust-lang/rust/pull/56243
3934 [56303]: https://github.com/rust-lang/rust/pull/56303/
3935 [56351]: https://github.com/rust-lang/rust/pull/56351/
3936 [56362]: https://github.com/rust-lang/rust/pull/56362
3937 [56642]: https://github.com/rust-lang/rust/pull/56642/
3938 [56769]: https://github.com/rust-lang/rust/pull/56769/
3939 [56805]: https://github.com/rust-lang/rust/pull/56805
3940 [56947]: https://github.com/rust-lang/rust/pull/56947/
3941 [57049]: https://github.com/rust-lang/rust/pull/57049/
3942 [57067]: https://github.com/rust-lang/rust/pull/57067/
3943 [57105]: https://github.com/rust-lang/rust/pull/57105
3944 [57130]: https://github.com/rust-lang/rust/pull/57130/
3945 [57167]: https://github.com/rust-lang/rust/pull/57167/
3946 [57175]: https://github.com/rust-lang/rust/pull/57175/
3947 [57234]: https://github.com/rust-lang/rust/pull/57234/
3948 [57332]: https://github.com/rust-lang/rust/pull/57332/
3949 [57465]: https://github.com/rust-lang/rust/pull/57465/
3950 [57532]: https://github.com/rust-lang/rust/pull/57532/
3951 [57535]: https://github.com/rust-lang/rust/pull/57535/
3952 [57566]: https://github.com/rust-lang/rust/pull/57566/
3953 [57615]: https://github.com/rust-lang/rust/pull/57615/
3954 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3955 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3956 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3957 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3958 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3959 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3960 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3961 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3962 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3963 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3964 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3965 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3966 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3967 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3968 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3969 [platform-support]: https://forge.rust-lang.org/platform-support.html
3971 Version 1.32.0 (2019-01-17)
3972 ==========================
3977 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3978 operator allows you to specify zero or one repetitions similar to the `*` and
3980 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3981 now always resolve to the item (`enum`, `struct`, etc.) available in the
3982 module if present, before resolving to a external crate or an item the prelude.][56759]
3985 enum Color { Red, Green, Blue }
3991 - [You can now match against `PhantomData<T>` types.][55837]
3992 - [You can now match against literals in macros with the `literal`
3993 specifier.][56072] This will match against a literal of any type.
3994 E.g. `1`, `'A'`, `"Hello World"`
3995 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3997 struct Point(i32, i32);
4000 pub fn new(x: i32, y: i32) -> Self {
4004 pub fn is_origin(&self) -> bool {
4012 - [Self can also now be used in type definitions.][56366] E.g.
4016 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4019 Cons(T, Box<Self>) // likewise here
4022 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4023 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4027 - [The default allocator has changed from jemalloc to the default allocator on
4028 your system.][55238] The compiler itself on Linux & macOS will still use
4029 jemalloc, but programs compiled with it will use the system allocator.
4030 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4034 - [`PathBuf` now implements `FromStr`.][55148]
4035 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4036 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4037 easily debug expressions in your rust program. E.g.
4040 let b = dbg!(a * 2) + 1;
4041 // ^-- prints: [src/main.rs:4] a * 2 = 4
4045 The following APIs are now `const` functions and can be used in a
4049 - [`UnsafeCell::get`]
4050 - [`char::is_ascii`]
4052 - [`ManuallyDrop::new`]
4053 - [`ManuallyDrop::into_inner`]
4054 - [`RangeInclusive::start`]
4055 - [`RangeInclusive::end`]
4056 - [`NonNull::as_ptr`]
4059 - [`Duration::as_secs`]
4060 - [`Duration::subsec_millis`]
4061 - [`Duration::subsec_micros`]
4062 - [`Duration::subsec_nanos`]
4064 - [`Ipv4Addr::is_unspecified`]
4066 - [`Ipv6Addr::octets`]
4070 - [`i8::to_be_bytes`]
4071 - [`i8::to_le_bytes`]
4072 - [`i8::to_ne_bytes`]
4073 - [`i8::from_be_bytes`]
4074 - [`i8::from_le_bytes`]
4075 - [`i8::from_ne_bytes`]
4076 - [`i16::to_be_bytes`]
4077 - [`i16::to_le_bytes`]
4078 - [`i16::to_ne_bytes`]
4079 - [`i16::from_be_bytes`]
4080 - [`i16::from_le_bytes`]
4081 - [`i16::from_ne_bytes`]
4082 - [`i32::to_be_bytes`]
4083 - [`i32::to_le_bytes`]
4084 - [`i32::to_ne_bytes`]
4085 - [`i32::from_be_bytes`]
4086 - [`i32::from_le_bytes`]
4087 - [`i32::from_ne_bytes`]
4088 - [`i64::to_be_bytes`]
4089 - [`i64::to_le_bytes`]
4090 - [`i64::to_ne_bytes`]
4091 - [`i64::from_be_bytes`]
4092 - [`i64::from_le_bytes`]
4093 - [`i64::from_ne_bytes`]
4094 - [`i128::to_be_bytes`]
4095 - [`i128::to_le_bytes`]
4096 - [`i128::to_ne_bytes`]
4097 - [`i128::from_be_bytes`]
4098 - [`i128::from_le_bytes`]
4099 - [`i128::from_ne_bytes`]
4100 - [`isize::to_be_bytes`]
4101 - [`isize::to_le_bytes`]
4102 - [`isize::to_ne_bytes`]
4103 - [`isize::from_be_bytes`]
4104 - [`isize::from_le_bytes`]
4105 - [`isize::from_ne_bytes`]
4106 - [`u8::to_be_bytes`]
4107 - [`u8::to_le_bytes`]
4108 - [`u8::to_ne_bytes`]
4109 - [`u8::from_be_bytes`]
4110 - [`u8::from_le_bytes`]
4111 - [`u8::from_ne_bytes`]
4112 - [`u16::to_be_bytes`]
4113 - [`u16::to_le_bytes`]
4114 - [`u16::to_ne_bytes`]
4115 - [`u16::from_be_bytes`]
4116 - [`u16::from_le_bytes`]
4117 - [`u16::from_ne_bytes`]
4118 - [`u32::to_be_bytes`]
4119 - [`u32::to_le_bytes`]
4120 - [`u32::to_ne_bytes`]
4121 - [`u32::from_be_bytes`]
4122 - [`u32::from_le_bytes`]
4123 - [`u32::from_ne_bytes`]
4124 - [`u64::to_be_bytes`]
4125 - [`u64::to_le_bytes`]
4126 - [`u64::to_ne_bytes`]
4127 - [`u64::from_be_bytes`]
4128 - [`u64::from_le_bytes`]
4129 - [`u64::from_ne_bytes`]
4130 - [`u128::to_be_bytes`]
4131 - [`u128::to_le_bytes`]
4132 - [`u128::to_ne_bytes`]
4133 - [`u128::from_be_bytes`]
4134 - [`u128::from_le_bytes`]
4135 - [`u128::from_ne_bytes`]
4136 - [`usize::to_be_bytes`]
4137 - [`usize::to_le_bytes`]
4138 - [`usize::to_ne_bytes`]
4139 - [`usize::from_be_bytes`]
4140 - [`usize::from_le_bytes`]
4141 - [`usize::from_ne_bytes`]
4145 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4146 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4150 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4154 - [The argument types for AVX's
4155 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4156 been changed from `*const` to `*mut` as the previous implementation
4160 [55148]: https://github.com/rust-lang/rust/pull/55148/
4161 [55238]: https://github.com/rust-lang/rust/pull/55238/
4162 [55280]: https://github.com/rust-lang/rust/pull/55280/
4163 [55610]: https://github.com/rust-lang/rust/pull/55610/
4164 [55663]: https://github.com/rust-lang/rust/pull/55663/
4165 [55702]: https://github.com/rust-lang/rust/pull/55702/
4166 [55837]: https://github.com/rust-lang/rust/pull/55837/
4167 [55843]: https://github.com/rust-lang/rust/pull/55843/
4168 [56072]: https://github.com/rust-lang/rust/pull/56072/
4169 [56245]: https://github.com/rust-lang/rust/pull/56245/
4170 [56365]: https://github.com/rust-lang/rust/pull/56365/
4171 [56366]: https://github.com/rust-lang/rust/pull/56366/
4172 [56395]: https://github.com/rust-lang/rust/pull/56395/
4173 [56759]: https://github.com/rust-lang/rust/pull/56759/
4174 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4175 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4176 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4177 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4178 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4179 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4180 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4181 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4182 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4183 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4184 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4185 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4186 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4187 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4188 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4189 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4190 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4191 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4192 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4193 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4194 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4195 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4196 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4197 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4198 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4199 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4200 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4201 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4202 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4203 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4204 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4205 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4206 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4207 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4208 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4209 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4210 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4211 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4212 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4213 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4214 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4215 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4216 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4217 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4218 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4219 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4220 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4221 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4222 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4223 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4224 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4225 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4226 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4227 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4228 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4229 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4230 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4231 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4232 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4233 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4234 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4235 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4236 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4237 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4238 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4239 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4240 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4241 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4242 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4243 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4244 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4245 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4246 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4247 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4248 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4249 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4250 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4251 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4252 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4253 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4254 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4255 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4256 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4257 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4258 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4259 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4260 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4261 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4262 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4263 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4264 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4265 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4266 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4269 Version 1.31.1 (2018-12-20)
4270 ===========================
4272 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4273 - [Fix broken go-to-definition in RLS][rls/1171]
4274 - [Fix infinite loop on hover in RLS][rls/1170]
4276 [56562]: https://github.com/rust-lang/rust/pull/56562
4277 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4278 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4280 Version 1.31.0 (2018-12-06)
4281 ==========================
4285 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4286 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4287 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4288 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4290 - [You can now define and use `const` functions.][54835] These are currently
4291 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4292 [language reference][const-reference] for what exactly is available.
4293 - [You can now use tool lints, which allow you to scope lints from external
4294 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4295 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4296 a crate, not just in exported functions.][54451]
4297 - [You can now use parentheses in pattern matches.][54497]
4301 - [Updated musl to 1.1.20][54430]
4305 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4306 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4307 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4308 into `Option<&mut T>` using the `From` trait.][53218]
4309 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4314 - [`slice::align_to`]
4315 - [`slice::align_to_mut`]
4316 - [`slice::chunks_exact`]
4317 - [`slice::chunks_exact_mut`]
4318 - [`slice::rchunks`]
4319 - [`slice::rchunks_mut`]
4320 - [`slice::rchunks_exact`]
4321 - [`slice::rchunks_exact_mut`]
4322 - [`Option::replace`]
4326 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4327 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4328 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4330 [52813]: https://github.com/rust-lang/rust/pull/52813/
4331 [53218]: https://github.com/rust-lang/rust/pull/53218/
4332 [54057]: https://github.com/rust-lang/rust/pull/54057/
4333 [54240]: https://github.com/rust-lang/rust/pull/54240/
4334 [54430]: https://github.com/rust-lang/rust/pull/54430/
4335 [54451]: https://github.com/rust-lang/rust/pull/54451/
4336 [54497]: https://github.com/rust-lang/rust/pull/54497/
4337 [54778]: https://github.com/rust-lang/rust/pull/54778/
4338 [54835]: https://github.com/rust-lang/rust/pull/54835/
4339 [54870]: https://github.com/rust-lang/rust/pull/54870/
4340 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4341 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4342 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4343 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4344 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4345 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4346 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4347 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4348 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4349 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4350 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4351 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4352 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4353 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4355 Version 1.30.1 (2018-11-08)
4356 ===========================
4358 - [Fixed overflow ICE in rustdoc][54199]
4359 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4361 [54199]: https://github.com/rust-lang/rust/pull/54199
4362 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4364 Version 1.30.0 (2018-10-25)
4365 ==========================
4369 - [Procedural macros are now available.][52081] These kinds of macros allow for
4370 more powerful code generation. There is a [new chapter available][proc-macros]
4371 in the Rust Programming Language book that goes further in depth.
4372 - [You can now use keywords as identifiers using the raw identifiers
4373 syntax (`r#`),][53236] e.g. `let r#for = true;`
4374 - [Using anonymous parameters in traits is now deprecated with a warning and
4375 will be a hard error in the 2018 edition.][53272]
4376 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4377 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4378 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4379 Previously, using a external crate in a module without a use statement
4380 required `let json = ::serde_json::from_str(foo);` but can now be written
4381 as `let json = serde_json::from_str(foo);`.
4382 - [You can now apply the `#[used]` attribute to static items to prevent the
4383 compiler from optimising them away, even if they appear to be unused,][51363]
4384 e.g. `#[used] static FOO: u32 = 1;`
4385 - [You can now import and reexport macros from other crates with the `use`
4386 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4387 the root module of the crate. If your macro relies on calling other local
4388 macros, it is recommended to export with the
4389 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4391 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4392 using the `vis` specifier.][53370]
4393 - [Non-macro attributes now allow all forms of literals, not just
4394 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4395 write `#[attr(true)]`.
4396 - [You can now specify a function to handle a panic in the Rust runtime with the
4397 `#[panic_handler]` attribute.][51366]
4401 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4402 - [Added the `aarch64-unknown-netbsd` target][53165]
4403 - [Upgraded to LLVM 8.][53611]
4407 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4411 - [`Ipv4Addr::BROADCAST`]
4412 - [`Ipv4Addr::LOCALHOST`]
4413 - [`Ipv4Addr::UNSPECIFIED`]
4414 - [`Ipv6Addr::LOCALHOST`]
4415 - [`Ipv6Addr::UNSPECIFIED`]
4416 - [`Iterator::find_map`]
4418 The following methods are replacement methods for `trim_left`, `trim_right`,
4419 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4421 - [`str::trim_end_matches`]
4423 - [`str::trim_start_matches`]
4424 - [`str::trim_start`]
4428 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4429 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4430 equivalent to calling `rustdoc --error-format=json`.
4431 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4435 - [`rustdoc` allows you to specify what edition to treat your code as with the
4436 `--edition` option.][54057]
4437 - [`rustdoc` now has the `--color` (specify whether to output color) and
4438 `--error-format` (specify error format, e.g. `json`) options.][53003]
4439 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4440 debug symbols.][53774]
4441 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4442 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4444 [50911]: https://github.com/rust-lang/rust/pull/50911/
4445 [51363]: https://github.com/rust-lang/rust/pull/51363/
4446 [51366]: https://github.com/rust-lang/rust/pull/51366/
4447 [52081]: https://github.com/rust-lang/rust/pull/52081/
4448 [53003]: https://github.com/rust-lang/rust/pull/53003/
4449 [53033]: https://github.com/rust-lang/rust/pull/53033/
4450 [53044]: https://github.com/rust-lang/rust/pull/53044/
4451 [53165]: https://github.com/rust-lang/rust/pull/53165/
4452 [53611]: https://github.com/rust-lang/rust/pull/53611/
4453 [53236]: https://github.com/rust-lang/rust/pull/53236/
4454 [53272]: https://github.com/rust-lang/rust/pull/53272/
4455 [53370]: https://github.com/rust-lang/rust/pull/53370/
4456 [53459]: https://github.com/rust-lang/rust/pull/53459/
4457 [53774]: https://github.com/rust-lang/rust/pull/53774/
4458 [53822]: https://github.com/rust-lang/rust/pull/53822/
4459 [54057]: https://github.com/rust-lang/rust/pull/54057/
4460 [54404]: https://github.com/rust-lang/rust/pull/54404/
4461 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4462 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4463 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4464 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4466 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4467 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4468 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4469 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4470 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4471 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4472 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4473 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4474 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4475 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4478 Version 1.29.2 (2018-10-11)
4479 ===========================
4481 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4482 - The `rls-preview` component on the windows-gnu targets has been restored.
4484 [54639]: https://github.com/rust-lang/rust/pull/54639
4487 Version 1.29.1 (2018-09-25)
4488 ===========================
4493 - The standard library's `str::repeat` function contained an out of bounds write
4494 caused by an integer overflow. This has been fixed by deterministically
4495 panicking when an overflow happens.
4497 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4501 Version 1.29.0 (2018-09-13)
4502 ==========================
4506 - [Bumped minimum LLVM version to 5.0.][51899]
4507 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4508 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4509 - [Upgraded to LLVM 7.][51966]
4513 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4514 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4515 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4516 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4518 - [`Cell<T>` now allows `T` to be unsized.][50494]
4519 - [`SocketAddr` is now stable on Redox.][52656]
4524 - [`Iterator::flatten`]
4529 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4530 `--locked` to disable this behavior.
4531 - [`cargo-install` will now allow you to cross compile an install
4532 using `--target`.][cargo/5614]
4533 - [Added the `cargo-fix` subcommand to automatically move project code from
4534 2015 edition to 2018.][cargo/5723]
4535 - [`cargo doc` can now optionally document private types using the
4536 `--document-private-items` flag.][cargo/5543]
4540 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4541 the specified level to that level.][52354] For example `--cap-lints warn`
4542 will demote `deny` and `forbid` lints to `warn`.
4543 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4544 fails and `101` if there is a panic.][52197]
4545 - [A preview of clippy has been made available through rustup.][51122]
4546 You can install the preview with `rustup component add clippy-preview`.
4550 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4551 Use `str::get_unchecked(begin..end)` instead.
4552 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4553 Consider using the `home_dir` function from
4554 https://crates.io/crates/dirs instead.
4555 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4556 - [`cfg` attributes and `--cfg` command line flags are now more
4557 strictly validated.][53893]
4559 [53893]: https://github.com/rust-lang/rust/pull/53893/
4560 [52861]: https://github.com/rust-lang/rust/pull/52861/
4561 [51966]: https://github.com/rust-lang/rust/pull/51966/
4562 [52656]: https://github.com/rust-lang/rust/pull/52656/
4563 [52239]: https://github.com/rust-lang/rust/pull/52239/
4564 [52330]: https://github.com/rust-lang/rust/pull/52330/
4565 [52354]: https://github.com/rust-lang/rust/pull/52354/
4566 [52402]: https://github.com/rust-lang/rust/pull/52402/
4567 [52197]: https://github.com/rust-lang/rust/pull/52197/
4568 [51807]: https://github.com/rust-lang/rust/pull/51807/
4569 [51899]: https://github.com/rust-lang/rust/pull/51899/
4570 [51912]: https://github.com/rust-lang/rust/pull/51912/
4571 [51619]: https://github.com/rust-lang/rust/pull/51619/
4572 [51656]: https://github.com/rust-lang/rust/pull/51656/
4573 [51178]: https://github.com/rust-lang/rust/pull/51178/
4574 [51122]: https://github.com/rust-lang/rust/pull/51122
4575 [50494]: https://github.com/rust-lang/rust/pull/50494/
4576 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4577 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4578 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4579 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4580 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4581 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4582 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4585 Version 1.28.0 (2018-08-02)
4586 ===========================
4590 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4591 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4592 the inner type across Foreign Function Interface (FFI) boundaries.
4593 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4594 and can now be used as identifiers.][51196]
4595 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4596 stable.][51241] This will allow users to specify a global allocator for
4598 - [Unit test functions marked with the `#[test]` attribute can now return
4599 `Result<(), E: Debug>` in addition to `()`.][51298]
4600 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4601 allows macros to easily target lifetimes.
4605 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4606 prioritise making smaller binary sizes. `z` is the same as `s` with the
4607 exception that it does not vectorise loops, which typically results in an even
4609 - [The short error format is now stable.][49546] Specified with
4610 `--error-format=short` this option will provide a more compressed output of
4611 rust error messages.
4612 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4613 - [Reduced the number of allocations in the macro parser.][50855] This can
4614 improve compile times of macro heavy crates on average by 5%.
4618 - [Implemented `Default` for `&mut str`.][51306]
4619 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4620 - [Implemented `Extend` for `()`.][50234]
4621 - [The `Debug` implementation of `time::Duration` should now be more easily
4622 human readable.][50364] Previously a `Duration` of one second would printed as
4623 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4624 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4625 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4626 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4627 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4628 for `PathBuf`.][50170]
4629 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4630 and `Wrapping<i128>`.][50465]
4631 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4632 possible.][51050] This can provide up to a 40% speed increase.
4633 - [Improved error messages when using `format!`.][50610]
4637 - [`Iterator::step_by`]
4638 - [`Path::ancestors`]
4639 - [`SystemTime::UNIX_EPOCH`]
4640 - [`alloc::GlobalAlloc`]
4642 - [`alloc::LayoutErr`]
4645 - [`alloc::alloc_zeroed`]
4646 - [`alloc::dealloc`]
4647 - [`alloc::realloc`]
4648 - [`alloc::handle_alloc_error`]
4649 - [`btree_map::Entry::or_default`]
4650 - [`fmt::Alignment`]
4651 - [`hash_map::Entry::or_default`]
4652 - [`iter::repeat_with`]
4653 - [`num::NonZeroUsize`]
4654 - [`num::NonZeroU128`]
4655 - [`num::NonZeroU16`]
4656 - [`num::NonZeroU32`]
4657 - [`num::NonZeroU64`]
4658 - [`num::NonZeroU8`]
4659 - [`ops::RangeBounds`]
4660 - [`slice::SliceIndex`]
4661 - [`slice::from_mut`]
4662 - [`slice::from_ref`]
4663 - [`{Any + Send + Sync}::downcast_mut`]
4664 - [`{Any + Send + Sync}::downcast_ref`]
4665 - [`{Any + Send + Sync}::is`]
4669 - [Cargo will now no longer allow you to publish crates with build scripts that
4670 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4671 considered to be immutable.
4675 - [The `suggestion_applicability` field in `rustc`'s json output is now
4676 stable.][50486] This will allow dev tools to check whether a code suggestion
4677 would apply to them.
4681 - [Rust will consider trait objects with duplicated constraints to be the same
4682 type as without the duplicated constraint.][51276] For example the below code will
4683 now fail to compile.
4688 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4691 impl Trait + Send + Send {
4692 fn test(&self) { println!("two"); }
4696 [49546]: https://github.com/rust-lang/rust/pull/49546/
4697 [50143]: https://github.com/rust-lang/rust/pull/50143/
4698 [50170]: https://github.com/rust-lang/rust/pull/50170/
4699 [50234]: https://github.com/rust-lang/rust/pull/50234/
4700 [50265]: https://github.com/rust-lang/rust/pull/50265/
4701 [50364]: https://github.com/rust-lang/rust/pull/50364/
4702 [50385]: https://github.com/rust-lang/rust/pull/50385/
4703 [50465]: https://github.com/rust-lang/rust/pull/50465/
4704 [50486]: https://github.com/rust-lang/rust/pull/50486/
4705 [50554]: https://github.com/rust-lang/rust/pull/50554/
4706 [50610]: https://github.com/rust-lang/rust/pull/50610/
4707 [50855]: https://github.com/rust-lang/rust/pull/50855/
4708 [51050]: https://github.com/rust-lang/rust/pull/51050/
4709 [51196]: https://github.com/rust-lang/rust/pull/51196/
4710 [51241]: https://github.com/rust-lang/rust/pull/51241/
4711 [51276]: https://github.com/rust-lang/rust/pull/51276/
4712 [51298]: https://github.com/rust-lang/rust/pull/51298/
4713 [51306]: https://github.com/rust-lang/rust/pull/51306/
4714 [51562]: https://github.com/rust-lang/rust/pull/51562/
4715 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4716 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4717 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4718 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4719 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4720 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4721 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4722 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4723 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4724 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4725 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4726 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4727 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4728 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4729 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4730 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4731 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4732 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4733 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4734 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4735 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4736 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4737 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4738 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4739 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4740 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4741 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4742 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4743 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4744 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4746 Version 1.27.2 (2018-07-20)
4747 ===========================
4752 - The borrow checker was fixed to avoid potential unsoundness when using
4753 match ergonomics: [#52213][52213].
4755 [52213]: https://github.com/rust-lang/rust/issues/52213
4757 Version 1.27.1 (2018-07-10)
4758 ===========================
4763 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4764 when running, which enabled executing code as some other user on a
4765 given machine. This release fixes that vulnerability; you can read
4766 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4768 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4773 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4774 match ergonomics: [#51415][51415], [#49534][49534].
4776 [51415]: https://github.com/rust-lang/rust/issues/51415
4777 [49534]: https://github.com/rust-lang/rust/issues/49534
4778 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4779 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4781 Version 1.27.0 (2018-06-21)
4782 ==========================
4786 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4787 be used as an identifier.
4788 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4789 bare `Trait` syntax, and should make it clearer when being used in tandem with
4790 `impl Trait` because it is equivalent to the following syntax:
4791 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4792 `Box<Trait> == Box<dyn Trait>`.
4793 - [Attributes on generic parameters such as types and lifetimes are
4794 now stable.][48851] e.g.
4795 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4796 - [The `#[must_use]` attribute can now also be used on functions as well as
4797 types.][48925] It provides a lint that by default warns users when the
4798 value returned by a function has not been used.
4802 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4806 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4807 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4808 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4809 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4810 the `cfg` attribute.
4811 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4812 std are now available in core.][49896]
4813 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4815 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4816 that the operation isn't done in place.
4817 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4818 the `#[must_use]` attribute][49533] to warn about unused potentially
4819 expensive allocations.
4823 - [`DoubleEndedIterator::rfind`]
4824 - [`DoubleEndedIterator::rfold`]
4825 - [`DoubleEndedIterator::try_rfold`]
4826 - [`Duration::from_micros`]
4827 - [`Duration::from_nanos`]
4828 - [`Duration::subsec_micros`]
4829 - [`Duration::subsec_millis`]
4830 - [`HashMap::remove_entry`]
4831 - [`Iterator::try_fold`]
4832 - [`Iterator::try_for_each`]
4834 - [`Option::filter`]
4835 - [`String::replace_range`]
4836 - [`Take::set_limit`]
4837 - [`hint::unreachable_unchecked`]
4838 - [`os::unix::process::parent_id`]
4839 - [`ptr::swap_nonoverlapping`]
4840 - [`slice::rsplit_mut`]
4842 - [`slice::swap_with_slice`]
4846 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4847 `readme`, and `repository` fields.][cargo/5386]
4848 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4849 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4850 a different directory than `target` for placing compilation artifacts.
4851 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4852 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4853 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4854 where cargo would infer a binary, Cargo will produce a warning. You can
4855 disable this feature ahead of time by setting any of the following to false:
4856 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4857 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4858 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4862 - [Added “The Rustc book” into the official documentation.][49707]
4863 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4864 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4868 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4869 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4870 compile, `"".is_empty()` will still compile.
4871 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4872 will only print the inner type.][48553] E.g.
4873 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4874 not `AtomicBool(true)`.
4875 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4876 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4877 alignment should cover all use cases.
4878 - The `.description()` method on the `std::error::Error` trait
4879 [has been soft-deprecated][50163]. It is no longer required to implement it.
4881 [48553]: https://github.com/rust-lang/rust/pull/48553/
4882 [48851]: https://github.com/rust-lang/rust/pull/48851/
4883 [48925]: https://github.com/rust-lang/rust/pull/48925/
4884 [49533]: https://github.com/rust-lang/rust/pull/49533/
4885 [49623]: https://github.com/rust-lang/rust/pull/49623/
4886 [49630]: https://github.com/rust-lang/rust/pull/49630/
4887 [49664]: https://github.com/rust-lang/rust/pull/49664/
4888 [49699]: https://github.com/rust-lang/rust/pull/49699/
4889 [49707]: https://github.com/rust-lang/rust/pull/49707/
4890 [49896]: https://github.com/rust-lang/rust/pull/49896/
4891 [49968]: https://github.com/rust-lang/rust/pull/49968/
4892 [50163]: https://github.com/rust-lang/rust/pull/50163
4893 [50177]: https://github.com/rust-lang/rust/pull/50177/
4894 [50378]: https://github.com/rust-lang/rust/pull/50378/
4895 [50423]: https://github.com/rust-lang/rust/pull/50423/
4896 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4897 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4898 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4899 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4900 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4901 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4902 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4903 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4904 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4905 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4906 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4907 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4908 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4909 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4910 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4911 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4912 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4913 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4914 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4915 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4916 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4917 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4918 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4919 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4920 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4921 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4922 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4923 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4924 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4927 Version 1.26.2 (2018-06-05)
4928 ==========================
4933 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4935 [51117]: https://github.com/rust-lang/rust/issues/51117
4938 Version 1.26.1 (2018-05-29)
4939 ==========================
4944 - [RLS now works on Windows.][50646]
4945 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4951 - [`fn main() -> impl Trait` no longer works for non-Termination
4953 This reverts an accidental stabilization.
4954 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4955 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4957 [50646]: https://github.com/rust-lang/rust/issues/50646
4958 [50656]: https://github.com/rust-lang/rust/pull/50656
4959 [50812]: https://github.com/rust-lang/rust/pull/50812
4960 [50950]: https://github.com/rust-lang/rust/issues/50950
4961 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4963 Version 1.26.0 (2018-05-10)
4964 ==========================
4968 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4969 implement either or both traits.][49299]
4970 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4971 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4972 lifetime can be elided.][49458]
4973 - [`impl Trait` is now stable allowing you to have abstract types in returns
4974 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4975 `fn open(path: impl AsRef<Path>)`.
4976 - [Pattern matching will now automatically apply dereferences.][49394]
4977 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4978 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4979 - [A lot of operations are now available in a const context.][46882] E.g. You
4980 can now index into constant arrays, reference and dereference into constants,
4981 and use tuple struct constructors.
4982 - [Fixed entry slice patterns are now stable.][48516] E.g.
4984 let points = [1, 2, 3, 4];
4986 [1, 2, 3, 4] => println!("All points were sequential."),
4987 _ => println!("Not all points were sequential."),
4994 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4995 - [Fixed exponential projection complexity on nested types.][48296]
4996 This can provide up to a ~12% reduction in compile times for certain crates.
4997 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4998 to remap path prefixes outputted by the compiler.
4999 - [Added `powerpc-unknown-netbsd` target.][48281]
5003 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5004 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5005 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5006 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5007 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5008 - [`ascii::escape_default` is now available in libcore.][48735]
5009 - [Trailing commas are now supported in std and core macros.][48056]
5010 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5011 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5016 - [`*const T::copy_to_nonoverlapping`]
5017 - [`*const T::copy_to`]
5018 - [`*const T::read_unaligned`]
5019 - [`*const T::read_volatile`]
5020 - [`*const T::read`]
5022 - [`*const T::wrapping_add`]
5023 - [`*const T::wrapping_sub`]
5025 - [`*mut T::copy_to_nonoverlapping`]
5026 - [`*mut T::copy_to`]
5027 - [`*mut T::read_unaligned`]
5028 - [`*mut T::read_volatile`]
5030 - [`*mut T::replace`]
5033 - [`*mut T::wrapping_add`]
5034 - [`*mut T::wrapping_sub`]
5035 - [`*mut T::write_bytes`]
5036 - [`*mut T::write_unaligned`]
5037 - [`*mut T::write_volatile`]
5040 - [`FromUtf8Error::as_bytes`]
5041 - [`LocalKey::try_with`]
5042 - [`Option::cloned`]
5043 - [`btree_map::Entry::and_modify`]
5044 - [`fs::read_to_string`]
5047 - [`hash_map::Entry::and_modify`]
5048 - [`iter::FusedIterator`]
5049 - [`ops::RangeInclusive`]
5050 - [`ops::RangeToInclusive`]
5052 - [`slice::rotate_left`]
5053 - [`slice::rotate_right`]
5054 - [`String::retain`]
5059 - [Cargo will now output path to custom commands when `-v` is
5060 passed with `--list`][cargo/5041]
5061 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5065 - [The second edition of "The Rust Programming Language" book is now recommended
5066 over the first.][48404]
5071 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5072 syntax is now invalid.
5074 use std::ops::Fn as dyn;
5075 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5077 - [The result of dereferences are no longer promoted to `'static`.][47408]
5081 const PAIR: &(i32, i32) = &(0, 1);
5082 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5085 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5086 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5088 - [Removed hoedown from rustdoc.][48274]
5089 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5091 [46882]: https://github.com/rust-lang/rust/pull/46882
5092 [47379]: https://github.com/rust-lang/rust/pull/47379
5093 [47408]: https://github.com/rust-lang/rust/pull/47408
5094 [47813]: https://github.com/rust-lang/rust/pull/47813
5095 [48056]: https://github.com/rust-lang/rust/pull/48056
5096 [48125]: https://github.com/rust-lang/rust/pull/48125
5097 [48235]: https://github.com/rust-lang/rust/pull/48235
5098 [48274]: https://github.com/rust-lang/rust/pull/48274
5099 [48281]: https://github.com/rust-lang/rust/pull/48281
5100 [48296]: https://github.com/rust-lang/rust/pull/48296
5101 [48326]: https://github.com/rust-lang/rust/pull/48326
5102 [48359]: https://github.com/rust-lang/rust/pull/48359
5103 [48404]: https://github.com/rust-lang/rust/pull/48404
5104 [48481]: https://github.com/rust-lang/rust/pull/48481
5105 [48516]: https://github.com/rust-lang/rust/pull/48516
5106 [48628]: https://github.com/rust-lang/rust/pull/48628
5107 [48629]: https://github.com/rust-lang/rust/pull/48629
5108 [48657]: https://github.com/rust-lang/rust/pull/48657
5109 [48735]: https://github.com/rust-lang/rust/pull/48735
5110 [48978]: https://github.com/rust-lang/rust/pull/48978
5111 [49101]: https://github.com/rust-lang/rust/pull/49101
5112 [49109]: https://github.com/rust-lang/rust/pull/49109
5113 [49162]: https://github.com/rust-lang/rust/pull/49162
5114 [49255]: https://github.com/rust-lang/rust/pull/49255
5115 [49299]: https://github.com/rust-lang/rust/pull/49299
5116 [49305]: https://github.com/rust-lang/rust/pull/49305
5117 [49394]: https://github.com/rust-lang/rust/pull/49394
5118 [49458]: https://github.com/rust-lang/rust/pull/49458
5119 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5120 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5121 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5122 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5123 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5124 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5125 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5126 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5127 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5128 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5129 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5130 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5131 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5132 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5133 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5134 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5135 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5136 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5137 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5138 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5139 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5140 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5141 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5142 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5143 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5144 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5145 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5146 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5147 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5148 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5149 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5150 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5151 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5152 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5153 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5154 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5155 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5156 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5157 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5158 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5159 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5160 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5163 Version 1.25.0 (2018-03-29)
5164 ==========================
5168 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5169 - [You can now use nested groups of imports.][47948]
5170 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5171 - [You can now have `|` at the start of a match arm.][47947] e.g.
5173 enum Foo { A, B, C }
5179 | Foo::B => println!("AB"),
5180 | Foo::C => println!("C"),
5187 - [Upgraded to LLVM 6.][47828]
5188 - [Added `-C lto=val` option.][47521]
5189 - [Added `i586-unknown-linux-musl` target][47282]
5193 - [Impl Send for `process::Command` on Unix.][47760]
5194 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5195 - [`UnsafeCell::into_inner` is now safe.][47204]
5196 - [Implement libstd for CloudABI.][47268]
5197 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5198 - [Implement `AsRef<Path>` for Component][46985]
5199 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5200 - [Moved `Duration` to libcore.][46666]
5204 - [`Location::column`]
5207 The following functions can now be used in a constant expression.
5208 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5209 - [`Duration::new`][47300]
5210 - [`Duration::from_secs`][47300]
5211 - [`Duration::from_millis`][47300]
5215 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5216 - [`cargo new` now defaults to creating a binary crate, instead of a
5217 library crate.][cargo/5029]
5221 - [Rust by example is now shipped with new releases][46196]
5225 - [Deprecated `net::lookup_host`.][47510]
5226 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5227 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5228 around indexing operations (see [#47349][47349]). This has been fixed (which also
5229 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5230 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5232 [33903]: https://github.com/rust-lang/rust/pull/33903
5233 [47947]: https://github.com/rust-lang/rust/pull/47947
5234 [47948]: https://github.com/rust-lang/rust/pull/47948
5235 [47760]: https://github.com/rust-lang/rust/pull/47760
5236 [47790]: https://github.com/rust-lang/rust/pull/47790
5237 [47828]: https://github.com/rust-lang/rust/pull/47828
5238 [47398]: https://github.com/rust-lang/rust/pull/47398
5239 [47510]: https://github.com/rust-lang/rust/pull/47510
5240 [47521]: https://github.com/rust-lang/rust/pull/47521
5241 [47204]: https://github.com/rust-lang/rust/pull/47204
5242 [47251]: https://github.com/rust-lang/rust/pull/47251
5243 [47268]: https://github.com/rust-lang/rust/pull/47268
5244 [47282]: https://github.com/rust-lang/rust/pull/47282
5245 [47300]: https://github.com/rust-lang/rust/pull/47300
5246 [47349]: https://github.com/rust-lang/rust/pull/47349
5247 [46931]: https://github.com/rust-lang/rust/pull/46931
5248 [46985]: https://github.com/rust-lang/rust/pull/46985
5249 [47006]: https://github.com/rust-lang/rust/pull/47006
5250 [46830]: https://github.com/rust-lang/rust/pull/46830
5251 [46095]: https://github.com/rust-lang/rust/pull/46095
5252 [46666]: https://github.com/rust-lang/rust/pull/46666
5253 [46196]: https://github.com/rust-lang/rust/pull/46196
5254 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5255 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5256 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5257 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5258 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5261 Version 1.24.1 (2018-03-01)
5262 ==========================
5264 - [Do not abort when unwinding through FFI][48251]
5265 - [Emit UTF-16 files for linker arguments on Windows][48318]
5266 - [Make the error index generator work again][48308]
5267 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5269 [48251]: https://github.com/rust-lang/rust/issues/48251
5270 [48308]: https://github.com/rust-lang/rust/issues/48308
5271 [48318]: https://github.com/rust-lang/rust/issues/48318
5272 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5275 Version 1.24.0 (2018-02-15)
5276 ==========================
5280 - [External `sysv64` ffi is now available.][46528]
5281 eg. `extern "sysv64" fn foo () {}`
5285 - [rustc now uses 16 codegen units by default for release builds.][46910]
5286 For the fastest builds, utilize `codegen-units=1`.
5287 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5288 - [Add `aarch64-unknown-openbsd` support][46760]
5292 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5293 improvement in performance in the majority of cases.
5294 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5295 with Windows.][46798]
5296 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5297 - [impl `From<bool>` for `AtomicBool`][46293]
5298 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5299 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5300 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5301 - [float::from_bits now just uses transmute.][46012] This provides
5302 some optimisations from LLVM.
5303 - [Copied `AsciiExt` methods onto `char`][46077]
5304 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5305 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5306 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5307 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5311 - [`RefCell::replace`]
5313 - [`atomic::spin_loop_hint`]
5315 The following functions can now be used in a constant expression.
5316 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5318 - [`AtomicBool::new`][46287]
5319 - [`AtomicUsize::new`][46287]
5320 - [`AtomicIsize::new`][46287]
5321 - [`AtomicPtr::new`][46287]
5322 - [`Cell::new`][46287]
5323 - [`{integer}::min_value`][46287]
5324 - [`{integer}::max_value`][46287]
5325 - [`mem::size_of`][46287]
5326 - [`mem::align_of`][46287]
5327 - [`ptr::null`][46287]
5328 - [`ptr::null_mut`][46287]
5329 - [`RefCell::new`][46287]
5330 - [`UnsafeCell::new`][46287]
5334 - [Added a `workspace.default-members` config that
5335 overrides implied `--all` in virtual workspaces.][cargo/4743]
5336 - [Enable incremental by default on development builds.][cargo/4817] Also added
5337 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5338 per-project or global basis respectively.
5345 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5346 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5347 in accordance with IETF RFC 4291 §2.2.
5348 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5349 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5350 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5351 - [Leading zeros in tuple struct members is now an error][47084]
5352 - [`column!()` macro is one-based instead of zero-based][46977]
5353 - [`fmt::Arguments` can no longer be shared across threads][45198]
5354 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5355 - [Cargo sets a different working directory for the compiler][cargo/4788]
5357 [44884]: https://github.com/rust-lang/rust/pull/44884
5358 [45198]: https://github.com/rust-lang/rust/pull/45198
5359 [45506]: https://github.com/rust-lang/rust/pull/45506
5360 [45990]: https://github.com/rust-lang/rust/pull/45990
5361 [46012]: https://github.com/rust-lang/rust/pull/46012
5362 [46077]: https://github.com/rust-lang/rust/pull/46077
5363 [46094]: https://github.com/rust-lang/rust/pull/46094
5364 [46284]: https://github.com/rust-lang/rust/pull/46284
5365 [46287]: https://github.com/rust-lang/rust/pull/46287
5366 [46293]: https://github.com/rust-lang/rust/pull/46293
5367 [46528]: https://github.com/rust-lang/rust/pull/46528
5368 [46671]: https://github.com/rust-lang/rust/pull/46671
5369 [46713]: https://github.com/rust-lang/rust/pull/46713
5370 [46735]: https://github.com/rust-lang/rust/pull/46735
5371 [46760]: https://github.com/rust-lang/rust/pull/46760
5372 [46798]: https://github.com/rust-lang/rust/pull/46798
5373 [46828]: https://github.com/rust-lang/rust/pull/46828
5374 [46831]: https://github.com/rust-lang/rust/pull/46831
5375 [46833]: https://github.com/rust-lang/rust/pull/46833
5376 [46910]: https://github.com/rust-lang/rust/pull/46910
5377 [46977]: https://github.com/rust-lang/rust/pull/46977
5378 [47018]: https://github.com/rust-lang/rust/pull/47018
5379 [47080]: https://github.com/rust-lang/rust/pull/47080
5380 [47084]: https://github.com/rust-lang/rust/pull/47084
5381 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5382 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5383 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5384 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5385 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5386 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5389 Version 1.23.0 (2018-01-04)
5390 ==========================
5394 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5395 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5396 Which should fix some confusing errors in some operations.
5400 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5401 undefined behavior.][45920]
5402 - [rustc now suggests renaming import if names clash.][45660]
5403 - [Display errors/warnings correctly when there are zero-width or
5404 wide characters.][45711]
5405 - [rustc now avoids unnecessary copies of arguments that are
5406 simple bindings][45380] This should improve memory usage on average by 5-10%.
5407 - [Updated musl used to build musl rustc to 1.1.17][45393]
5411 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5412 - [Implement Hash for raw pointers to unsized types][45483]
5413 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5414 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5415 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5416 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5417 and `<*mut T>::as_mut`][44932]
5418 - [Optimized `Thread::{park, unpark}` implementation][45524]
5419 - [Improved `SliceExt::binary_search` performance.][45333]
5420 - [impl `FromIterator<()>` for `()`][45379]
5421 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5429 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5430 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5431 - [Added unit test checking to `cargo check`][cargo/4592]
5432 - [Cargo now lets you install a specific version
5433 using `cargo install --version`][cargo/4637]
5437 - [Releases now ship with the Cargo book documentation.][45692]
5438 - [rustdoc now prints rendering warnings on every run.][45324]
5442 - [Changes have been made to type equality to make it more correct,
5443 in rare cases this could break some code.][45853] [Tracking issue for
5444 further information][45852]
5445 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5446 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5447 Android 9, the minimum supported version is Android 14.
5448 - [Bumped the minimum LLVM to 3.9][45326]
5450 [44042]: https://github.com/rust-lang/rust/pull/44042
5451 [44932]: https://github.com/rust-lang/rust/pull/44932
5452 [45267]: https://github.com/rust-lang/rust/pull/45267
5453 [45324]: https://github.com/rust-lang/rust/pull/45324
5454 [45326]: https://github.com/rust-lang/rust/pull/45326
5455 [45333]: https://github.com/rust-lang/rust/pull/45333
5456 [45379]: https://github.com/rust-lang/rust/pull/45379
5457 [45380]: https://github.com/rust-lang/rust/pull/45380
5458 [45393]: https://github.com/rust-lang/rust/pull/45393
5459 [45435]: https://github.com/rust-lang/rust/pull/45435
5460 [45483]: https://github.com/rust-lang/rust/pull/45483
5461 [45524]: https://github.com/rust-lang/rust/pull/45524
5462 [45571]: https://github.com/rust-lang/rust/pull/45571
5463 [45580]: https://github.com/rust-lang/rust/pull/45580
5464 [45610]: https://github.com/rust-lang/rust/pull/45610
5465 [45660]: https://github.com/rust-lang/rust/pull/45660
5466 [45692]: https://github.com/rust-lang/rust/pull/45692
5467 [45711]: https://github.com/rust-lang/rust/pull/45711
5468 [45772]: https://github.com/rust-lang/rust/pull/45772
5469 [45852]: https://github.com/rust-lang/rust/issues/45852
5470 [45853]: https://github.com/rust-lang/rust/pull/45853
5471 [45887]: https://github.com/rust-lang/rust/pull/45887
5472 [45920]: https://github.com/rust-lang/rust/pull/45920
5473 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5474 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5475 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5478 Version 1.22.1 (2017-11-22)
5479 ==========================
5481 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5483 [46183]: https://github.com/rust-lang/rust/pull/46183
5485 Version 1.22.0 (2017-11-22)
5486 ==========================
5490 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5491 - [Now accepts underscores in unicode escapes][43716]
5492 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5493 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5497 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5498 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5499 This should decrease compile times for debug builds.
5500 - [strict memory alignment now enabled on ARMv6][45094]
5501 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5505 - [Allow atomic operations up to 32 bits
5506 on `armv5te_unknown_linux_gnueabi`][44978]
5507 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5508 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5509 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5510 - [Properly detect overflow in `Instant += Duration`.][44220]
5511 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5512 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5513 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5520 - [Cargo will now build multi file examples in subdirectories of the `examples`
5521 folder that have a `main.rs` file.][cargo/4496]
5522 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5523 the old format will continue to work and can be updated with `cargo update`.
5524 - [Now supports vendoring git repositories][cargo/3992]
5528 - [`libbacktrace` is now available on Apple platforms.][44251]
5529 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5530 This now lets you specify that a given code example will fail to compile.
5534 - [The minimum Android version that rustc can build for has been bumped
5535 to `4.0` from `2.3`][45656]
5536 - [Allowing `T op= &T` for numeric types has broken some type
5537 inference cases][45480]
5540 [42526]: https://github.com/rust-lang/rust/pull/42526
5541 [43716]: https://github.com/rust-lang/rust/pull/43716
5542 [43949]: https://github.com/rust-lang/rust/pull/43949
5543 [44015]: https://github.com/rust-lang/rust/pull/44015
5544 [44220]: https://github.com/rust-lang/rust/pull/44220
5545 [44251]: https://github.com/rust-lang/rust/pull/44251
5546 [44287]: https://github.com/rust-lang/rust/pull/44287
5547 [44303]: https://github.com/rust-lang/rust/pull/44303
5548 [44456]: https://github.com/rust-lang/rust/pull/44456
5549 [44466]: https://github.com/rust-lang/rust/pull/44466
5550 [44895]: https://github.com/rust-lang/rust/pull/44895
5551 [44966]: https://github.com/rust-lang/rust/pull/44966
5552 [44978]: https://github.com/rust-lang/rust/pull/44978
5553 [45041]: https://github.com/rust-lang/rust/pull/45041
5554 [45064]: https://github.com/rust-lang/rust/pull/45064
5555 [45075]: https://github.com/rust-lang/rust/pull/45075
5556 [45094]: https://github.com/rust-lang/rust/pull/45094
5557 [45095]: https://github.com/rust-lang/rust/pull/45095
5558 [45480]: https://github.com/rust-lang/rust/issues/45480
5559 [45656]: https://github.com/rust-lang/rust/pull/45656
5560 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5561 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5562 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5569 Version 1.21.0 (2017-10-12)
5570 ==========================
5574 - [You can now use static references for literals.][43838]
5578 let x: &'static u32 = &0;
5581 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5584 my_macro!(Vec<i32>::new); // Always worked
5585 my_macro!(Vec::<i32>::new); // Now works
5590 - [Upgraded jemalloc to 4.5.0][43911]
5591 - [Enabled unwinding panics on Redox][43917]
5592 - [Now runs LLVM in parallel during translation phase.][43506]
5593 This should reduce peak memory usage.
5597 - [Generate builtin impls for `Clone` for all arrays and tuples that
5598 are `T: Clone`][43690]
5599 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5600 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5601 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5606 [`std::mem::discriminant`]
5610 - [You can now call `cargo install` with multiple package names][cargo/4216]
5611 - [Cargo commands inside a virtual workspace will now implicitly
5612 pass `--all`][cargo/4335]
5613 - [Added a `[patch]` section to `Cargo.toml` to handle
5614 prepublication dependencies][cargo/4123] [RFC 1969]
5615 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5616 like patterns][cargo/4270]
5617 - [Added the `--all-targets` option][cargo/4400]
5618 - [Using required dependencies as a feature is now deprecated and emits
5619 a warning][cargo/4364]
5624 - [Cargo docs are moving][43916]
5625 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5626 - [The rustdoc book is now available][43863]
5627 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5628 - [Added a preview of RLS has been made available through rustup][44204]
5629 Install with `rustup component add rls-preview`
5630 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5631 Previously only showed `std::os::unix`.
5635 - [Changes in method matching against higher-ranked types][43880] This may cause
5636 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5637 - [rustc's JSON error output's byte position start at top of file.][42973]
5638 Was previously relative to the rustc's internal `CodeMap` struct which
5639 required the unstable library `libsyntax` to correctly use.
5640 - [`unused_results` lint no longer ignores booleans][43728]
5642 [42565]: https://github.com/rust-lang/rust/pull/42565
5643 [42973]: https://github.com/rust-lang/rust/pull/42973
5644 [43348]: https://github.com/rust-lang/rust/pull/43348
5645 [43459]: https://github.com/rust-lang/rust/pull/43459
5646 [43506]: https://github.com/rust-lang/rust/pull/43506
5647 [43540]: https://github.com/rust-lang/rust/pull/43540
5648 [43690]: https://github.com/rust-lang/rust/pull/43690
5649 [43728]: https://github.com/rust-lang/rust/pull/43728
5650 [43838]: https://github.com/rust-lang/rust/pull/43838
5651 [43863]: https://github.com/rust-lang/rust/pull/43863
5652 [43880]: https://github.com/rust-lang/rust/pull/43880
5653 [43911]: https://github.com/rust-lang/rust/pull/43911
5654 [43916]: https://github.com/rust-lang/rust/pull/43916
5655 [43917]: https://github.com/rust-lang/rust/pull/43917
5656 [44204]: https://github.com/rust-lang/rust/pull/44204
5657 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5658 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5659 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5660 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5661 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5662 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5663 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5664 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5665 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5667 Version 1.20.0 (2017-08-31)
5668 ===========================
5672 - [Associated constants are now stabilised.][42809]
5673 - [A lot of macro bugs are now fixed.][42913]
5678 - [Struct fields are now properly coerced to the expected field type.][42807]
5679 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5680 `wasm32-experimental-emscripten` target.
5681 - [Changed some of the error messages to be more helpful.][42033]
5682 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5684 - [rustc now reports the total number of errors on compilation failure][43015]
5685 previously this was only the number of errors in the pass that failed.
5686 - [Expansion in rustc has been sped up 29x.][42533]
5687 - [added `msp430-none-elf` target.][43099]
5688 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5690 - [Fixes backtraces on Redox][43228]
5691 - [rustc now identifies different versions of same crate when absolute paths of
5692 different types match in an error message.][42826]
5698 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5699 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5701 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5702 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5703 - [Impl `Clone` for `DefaultHasher`.][42799]
5704 - [Impl `Sync` for `SyncSender`.][42397]
5705 - [Impl `FromStr` for `char`][42271]
5706 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5708 - [allow messages in the `unimplemented!()` macro.][42155]
5709 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5710 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5711 - [Upgrade to Unicode 10.0.0][42999]
5712 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5713 - [Skip the main thread's manual stack guard on Linux][43072]
5714 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5715 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5717 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5722 - [`CStr::into_c_string`]
5723 - [`CString::as_c_str`]
5724 - [`CString::into_boxed_c_str`]
5725 - [`Chain::get_mut`]
5726 - [`Chain::get_ref`]
5727 - [`Chain::into_inner`]
5728 - [`Option::get_or_insert_with`]
5729 - [`Option::get_or_insert`]
5730 - [`OsStr::into_os_string`]
5731 - [`OsString::into_boxed_os_str`]
5734 - [`Utf8Error::error_len`]
5735 - [`char::EscapeDebug`]
5736 - [`char::escape_debug`]
5737 - [`compile_error!`]
5738 - [`f32::from_bits`]
5740 - [`f64::from_bits`]
5742 - [`mem::ManuallyDrop`]
5743 - [`slice::sort_unstable_by_key`]
5744 - [`slice::sort_unstable_by`]
5745 - [`slice::sort_unstable`]
5746 - [`str::from_boxed_utf8_unchecked`]
5747 - [`str::as_bytes_mut`]
5748 - [`str::as_bytes_mut`]
5749 - [`str::from_utf8_mut`]
5750 - [`str::from_utf8_unchecked_mut`]
5752 - [`str::get_unchecked_mut`]
5753 - [`str::get_unchecked`]
5755 - [`str::into_boxed_bytes`]
5760 - [Cargo API token location moved from `~/.cargo/config` to
5761 `~/.cargo/credentials`.][cargo/3978]
5762 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5763 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5764 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5765 - [You can now specify version of a binary when installed through
5766 `cargo install` using `--vers`.][cargo/4229]
5767 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5768 failure.][cargo/4248]
5769 - [Changed the convention around which file is the crate root.][cargo/4259]
5774 - [Functions with `'static` in their return types will now not be as usable as
5775 if they were using lifetime parameters instead.][42417]
5776 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5777 takes the sign of NaN into account where previously didn't.][42430]
5779 [42033]: https://github.com/rust-lang/rust/pull/42033
5780 [42155]: https://github.com/rust-lang/rust/pull/42155
5781 [42271]: https://github.com/rust-lang/rust/pull/42271
5782 [42397]: https://github.com/rust-lang/rust/pull/42397
5783 [42417]: https://github.com/rust-lang/rust/pull/42417
5784 [42430]: https://github.com/rust-lang/rust/pull/42430
5785 [42431]: https://github.com/rust-lang/rust/pull/42431
5786 [42533]: https://github.com/rust-lang/rust/pull/42533
5787 [42571]: https://github.com/rust-lang/rust/pull/42571
5788 [42613]: https://github.com/rust-lang/rust/pull/42613
5789 [42799]: https://github.com/rust-lang/rust/pull/42799
5790 [42807]: https://github.com/rust-lang/rust/pull/42807
5791 [42809]: https://github.com/rust-lang/rust/pull/42809
5792 [42822]: https://github.com/rust-lang/rust/pull/42822
5793 [42826]: https://github.com/rust-lang/rust/pull/42826
5794 [42854]: https://github.com/rust-lang/rust/pull/42854
5795 [42913]: https://github.com/rust-lang/rust/pull/42913
5796 [42999]: https://github.com/rust-lang/rust/pull/42999
5797 [43011]: https://github.com/rust-lang/rust/pull/43011
5798 [43015]: https://github.com/rust-lang/rust/pull/43015
5799 [43072]: https://github.com/rust-lang/rust/pull/43072
5800 [43077]: https://github.com/rust-lang/rust/pull/43077
5801 [43097]: https://github.com/rust-lang/rust/pull/43097
5802 [43099]: https://github.com/rust-lang/rust/pull/43099
5803 [43170]: https://github.com/rust-lang/rust/pull/43170
5804 [43178]: https://github.com/rust-lang/rust/pull/43178
5805 [43185]: https://github.com/rust-lang/rust/pull/43185
5806 [43228]: https://github.com/rust-lang/rust/pull/43228
5807 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5808 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5809 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5810 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5811 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5812 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5813 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5814 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5815 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5816 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5817 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5818 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5819 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5820 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5821 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5822 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5823 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5824 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5825 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5826 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5827 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5828 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5829 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5830 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5831 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5832 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5833 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5834 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5835 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5836 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5837 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5838 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5839 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5840 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5841 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5842 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5843 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5844 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5847 Version 1.19.0 (2017-07-20)
5848 ===========================
5853 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5854 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5855 - [Macro recursion limit increased to 1024 from 64.][41676]
5856 - [Added lint for detecting unused macros.][41907]
5857 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5858 For example: `let x = loop { break 7; };`
5859 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5860 contain `Copy` types and cannot have a `Drop` implementation.
5861 Example: `union Foo { bar: u8, baz: usize }`
5862 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5863 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5868 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5869 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5870 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5871 you should use `--target armv7-linux-androideabi`.
5872 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5873 - [Minor optimisation of string operations.][42037]
5874 - [Compiler error message is now `aborting due to previous error(s)` instead of
5875 `aborting due to N previous errors`][42150] This was previously inaccurate and
5876 would only count certain kinds of errors.
5877 - [The compiler now supports Visual Studio 2017][42225]
5878 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5879 - [Added a lot][42264] of [new error codes][42302]
5880 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5881 libraries with C Run-time Libraries(CRT) to be statically linked.
5882 - [Fixed various ARM codegen bugs][42740]
5887 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5888 `Extend<Cow<'a, str>>`][41449]
5889 - [`Vec` now implements `From<&mut [T]>`][41530]
5890 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5891 - [`SplitWhitespace` now implements `Clone`][41659]
5892 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5894 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5895 macros, but for printing to stderr.
5900 - [`OsString::shrink_to_fit`]
5903 - [`thread::ThreadId`]
5908 - [Build scripts can now add environment variables to the environment
5909 the crate is being compiled in.
5910 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5911 - [Subcommands now replace the current process rather than spawning a new
5912 child process][cargo/3970]
5913 - [Workspace members can now accept glob file patterns][cargo/3979]
5914 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5915 the members in a given workspace.][cargo/3988]
5916 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5917 - [Target directory path is now in the cargo metadata][cargo/4022]
5918 - [Cargo no longer checks out a local working directory for the
5919 crates.io index][cargo/4026] This should provide smaller file size for the
5920 registry, and improve cloning times, especially on Windows machines.
5921 - [Added an `--exclude` option for excluding certain packages when using the
5922 `--all` option][cargo/4031]
5923 - [Cargo will now automatically retry when receiving a 5xx error
5924 from crates.io][cargo/4032]
5925 - [The `--features` option now accepts multiple comma or space
5926 delimited values.][cargo/4084]
5927 - [Added support for custom target specific runners][cargo/3954]
5932 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5934 - [Rust will now release XZ compressed packages][rust-installer/57]
5935 - [rustup will now prefer to download rust packages with
5936 XZ compression][rustup/1100] over GZip packages.
5937 - [Added the ability to escape `#` in rust documentation][41785] By adding
5938 additional `#`'s ie. `##` is now `#`
5943 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5944 - [`-Z` flags are now no longer allowed to be used on the stable
5945 compiler.][41751] This has been a warning for a year previous to this.
5946 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5947 longer works][42844]. Users should migrate to the built-in `check`
5948 command, which has been available since 1.16.
5949 - [Ending a float literal with `._` is now a hard error.
5950 Example: `42._` .][41946]
5951 - [Any use of a private `extern crate` outside of its module is now a
5952 hard error.][36886] This was previously a warning.
5953 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5954 relative while the `::` prefix makes a path absolute, but was ignored and the
5955 path was relative regardless.
5956 - [Floating point constants in match patterns is now a hard error][36890]
5957 This was previously a warning.
5958 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5959 match patterns is now a hard error][36891] This was previously a warning.
5960 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5962 - [From the pound escape, lines consisting of multiple `#`s are
5964 - [It is an error to re-export private enum variants][42460]. This is
5965 known to break a number of crates that depend on an older version of
5967 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5968 to use it to find the linker, and the build will fail where it did
5969 not previously][42607]
5971 [36886]: https://github.com/rust-lang/rust/issues/36886
5972 [36888]: https://github.com/rust-lang/rust/issues/36888
5973 [36890]: https://github.com/rust-lang/rust/issues/36890
5974 [36891]: https://github.com/rust-lang/rust/issues/36891
5975 [36892]: https://github.com/rust-lang/rust/issues/36892
5976 [37406]: https://github.com/rust-lang/rust/issues/37406
5977 [39983]: https://github.com/rust-lang/rust/pull/39983
5978 [41145]: https://github.com/rust-lang/rust/pull/41145
5979 [41192]: https://github.com/rust-lang/rust/pull/41192
5980 [41258]: https://github.com/rust-lang/rust/pull/41258
5981 [41370]: https://github.com/rust-lang/rust/pull/41370
5982 [41449]: https://github.com/rust-lang/rust/pull/41449
5983 [41530]: https://github.com/rust-lang/rust/pull/41530
5984 [41624]: https://github.com/rust-lang/rust/pull/41624
5985 [41656]: https://github.com/rust-lang/rust/pull/41656
5986 [41659]: https://github.com/rust-lang/rust/pull/41659
5987 [41676]: https://github.com/rust-lang/rust/pull/41676
5988 [41751]: https://github.com/rust-lang/rust/pull/41751
5989 [41764]: https://github.com/rust-lang/rust/pull/41764
5990 [41785]: https://github.com/rust-lang/rust/pull/41785
5991 [41873]: https://github.com/rust-lang/rust/pull/41873
5992 [41907]: https://github.com/rust-lang/rust/pull/41907
5993 [41946]: https://github.com/rust-lang/rust/pull/41946
5994 [42016]: https://github.com/rust-lang/rust/pull/42016
5995 [42037]: https://github.com/rust-lang/rust/pull/42037
5996 [42068]: https://github.com/rust-lang/rust/pull/42068
5997 [42150]: https://github.com/rust-lang/rust/pull/42150
5998 [42162]: https://github.com/rust-lang/rust/pull/42162
5999 [42225]: https://github.com/rust-lang/rust/pull/42225
6000 [42264]: https://github.com/rust-lang/rust/pull/42264
6001 [42302]: https://github.com/rust-lang/rust/pull/42302
6002 [42460]: https://github.com/rust-lang/rust/issues/42460
6003 [42607]: https://github.com/rust-lang/rust/issues/42607
6004 [42740]: https://github.com/rust-lang/rust/pull/42740
6005 [42844]: https://github.com/rust-lang/rust/issues/42844
6006 [42948]: https://github.com/rust-lang/rust/pull/42948
6007 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6008 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6009 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6010 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6011 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6012 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6013 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6014 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6015 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6016 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6017 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6018 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6019 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6020 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6021 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6022 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6023 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6024 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6025 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6026 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6027 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6028 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6031 Version 1.18.0 (2017-06-08)
6032 ===========================
6037 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6038 make the item visible to just that module tree. Also accepts the keyword
6039 `crate` to make something public to the whole crate but not users of the
6040 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6041 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6042 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6043 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6044 types like `Write + Send`, trailing `+` are now supported in trait objects,
6045 and better error reporting for trait objects starting with `?Sized`.
6046 - [0e+10 is now a valid floating point literal][40589]
6047 - [Now warns if you bind a lifetime parameter to 'static][40734]
6048 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6049 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6050 representation in some cases.][40377]
6055 - [rustc can now emit mir with `--emit mir`][39891]
6056 - [Improved LLVM IR for trivial functions][40367]
6057 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6058 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6059 opportunities found through profiling
6060 - [Improved backtrace formatting when panicking][38165]
6065 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6066 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6067 iteration or reallocation.
6068 - [Simplified HashMap Bucket interface][40561] provides performance
6069 improvements for iterating and cloning.
6070 - [Specialize Vec::from_elem to use calloc][40409]
6071 - [Fixed Race condition in fs::create_dir_all][39799]
6072 - [No longer caching stdio on Windows][40516]
6073 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6074 2.50%~ faster and in one case now 12.50% faster.
6075 - [Optimized `AtomicBool::fetch_nand`][41143]
6080 - [`Child::try_wait`]
6081 - [`HashMap::retain`]
6082 - [`HashSet::retain`]
6084 - [`TcpStream::peek`]
6085 - [`UdpSocket::peek`]
6086 - [`UdpSocket::peek_from`]
6091 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6092 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6093 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6094 - [Added Android build support][cargo/3885]
6095 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6096 of a certain type, for example `cargo build --bins` will build all
6098 - [Added support for haiku][cargo/3952]
6103 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6104 - [Rust now uses the official cross compiler for NetBSD][40612]
6105 - [rustdoc now accepts `#` at the start of files][40828]
6106 - [Fixed jemalloc support for musl][41168]
6111 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6112 always placed after the sign if it exists and before the digits. With the `#`
6113 flag the zeroes are placed after the prefix and before the digits.
6114 - [Due to the struct field optimisation][40377], using `transmute` on structs
6115 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6116 always been undefined behavior, but is now more likely to break in practice.
6117 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6118 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6119 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6120 - [Overlapping inherent `impl`s are now a hard error][40728]
6121 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6122 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6123 `out.asm` and `out.ll` instead of only one of the filetypes.
6124 - [ calling a function that returns `Self` will no longer work][41805] when
6125 the size of `Self` cannot be statically determined.
6126 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6127 this has caused a few regressions namely:
6129 - Changed the link order of local static/dynamic libraries (respecting the
6130 order on given rather than having the compiler reorder).
6131 - Changed how MinGW is linked, native code linked to dynamic libraries
6132 may require manually linking to the gcc support library (for the native
6135 [38165]: https://github.com/rust-lang/rust/pull/38165
6136 [39799]: https://github.com/rust-lang/rust/pull/39799
6137 [39891]: https://github.com/rust-lang/rust/pull/39891
6138 [40043]: https://github.com/rust-lang/rust/pull/40043
6139 [40241]: https://github.com/rust-lang/rust/pull/40241
6140 [40338]: https://github.com/rust-lang/rust/pull/40338
6141 [40367]: https://github.com/rust-lang/rust/pull/40367
6142 [40377]: https://github.com/rust-lang/rust/pull/40377
6143 [40409]: https://github.com/rust-lang/rust/pull/40409
6144 [40516]: https://github.com/rust-lang/rust/pull/40516
6145 [40556]: https://github.com/rust-lang/rust/pull/40556
6146 [40561]: https://github.com/rust-lang/rust/pull/40561
6147 [40589]: https://github.com/rust-lang/rust/pull/40589
6148 [40612]: https://github.com/rust-lang/rust/pull/40612
6149 [40723]: https://github.com/rust-lang/rust/pull/40723
6150 [40728]: https://github.com/rust-lang/rust/pull/40728
6151 [40731]: https://github.com/rust-lang/rust/pull/40731
6152 [40734]: https://github.com/rust-lang/rust/pull/40734
6153 [40805]: https://github.com/rust-lang/rust/pull/40805
6154 [40807]: https://github.com/rust-lang/rust/pull/40807
6155 [40828]: https://github.com/rust-lang/rust/pull/40828
6156 [40870]: https://github.com/rust-lang/rust/pull/40870
6157 [41085]: https://github.com/rust-lang/rust/pull/41085
6158 [41143]: https://github.com/rust-lang/rust/pull/41143
6159 [41168]: https://github.com/rust-lang/rust/pull/41168
6160 [41270]: https://github.com/rust-lang/rust/issues/41270
6161 [41469]: https://github.com/rust-lang/rust/pull/41469
6162 [41805]: https://github.com/rust-lang/rust/issues/41805
6163 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6164 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6165 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6166 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6167 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6168 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6169 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6170 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6171 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6172 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6173 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6174 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6175 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6176 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6179 Version 1.17.0 (2017-04-27)
6180 ===========================
6185 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6186 * [Fields of structs may be initialized without duplicating the field/variable
6187 names][39761]. [RFC 1682]
6188 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6189 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6190 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6191 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6192 `'b`. Soundness fix.
6193 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6194 * [Static variables may contain references to other statics][40027]
6199 * [Exit quickly on only `--emit dep-info`][40336]
6200 * [Make `-C relocation-model` more correctly determine whether the linker
6201 creates a position-independent executable][40245]
6202 * [Add `-C overflow-checks` to directly control whether integer overflow
6204 * [The rustc type checker now checks items on demand instead of in a single
6205 in-order pass][40008]. This is mostly an internal refactoring in support of
6206 future work, including incremental type checking, but also resolves [RFC
6207 1647], allowing `Self` to appear in `impl` `where` clauses.
6208 * [Optimize vtable loads][39995]
6209 * [Turn off vectorization for Emscripten targets][39990]
6210 * [Provide suggestions for unknown macros imported with `use`][39953]
6211 * [Fix ICEs in path resolution][39939]
6212 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6213 * [Add clearer error message using `&str + &str`][39116]
6224 * [`Ordering::then`]
6225 * [`Ordering::then_with`]
6226 * [`BTreeMap::range`]
6227 * [`BTreeMap::range_mut`]
6228 * [`collections::Bound`]
6229 * [`process::abort`]
6230 * [`ptr::read_unaligned`]
6231 * [`ptr::write_unaligned`]
6232 * [`Result::expect_err`]
6235 * [`Cell::into_inner`]
6241 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6242 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6243 * [`String` implements `FromIterator<&char>`][40028]
6244 * `Box` [implements][40009] a number of new conversions:
6245 `From<Box<str>> for String`,
6246 `From<Box<[T]>> for Vec<T>`,
6247 `From<Box<CStr>> for CString`,
6248 `From<Box<OsStr>> for OsString`,
6249 `From<Box<Path>> for PathBuf`,
6250 `Into<Box<str>> for String`,
6251 `Into<Box<[T]>> for Vec<T>`,
6252 `Into<Box<CStr>> for CString`,
6253 `Into<Box<OsStr>> for OsString`,
6254 `Into<Box<Path>> for PathBuf`,
6255 `Default for Box<str>`,
6256 `Default for Box<CStr>`,
6257 `Default for Box<OsStr>`,
6258 `From<&CStr> for Box<CStr>`,
6259 `From<&OsStr> for Box<OsStr>`,
6260 `From<&Path> for Box<Path>`
6261 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6262 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6263 * [Slightly optimize `slice::sort`][39538]
6264 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6265 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6266 `Box<str>` implements `From<&str>`][39438]
6267 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6268 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6269 * [`format!` estimates the needed capacity before writing a string][39356]
6270 * [Support unprivileged symlink creation in Windows][38921]
6271 * [`PathBuf` implements `Default`][38764]
6272 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6273 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6274 and poor hash functions.
6279 * [Add `cargo check --all`][cargo/3731]
6280 * [Add an option to ignore SSL revocation checking][cargo/3699]
6281 * [Add `cargo run --package`][cargo/3691]
6282 * [Add `required_features`][cargo/3667]
6283 * [Assume `build.rs` is a build script][cargo/3664]
6284 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6289 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6291 * [The "Unstable Book" documents nightly-only features][ubook]
6292 * [Improve the style of the sidebar in rustdoc output][40265]
6293 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6294 * [Fix MSP430 breakage due to `i128`][40257]
6295 * [Preliminary Solaris/SPARCv9 support][39903]
6296 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6297 run without installing the MSVC runtime.
6298 * [`rustdoc --test` includes file names in test names][39788]
6299 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6300 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6301 * [Initial support for `aarch64-unknown-freebsd`][39491]
6302 * [Initial support for `i686-unknown-netbsd`][39426]
6303 * [This release no longer includes the old makefile build system][39431]. Rust
6304 is built with a custom build system, written in Rust, and with Cargo.
6305 * [Add Debug implementations for libcollection structs][39002]
6306 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6307 * [`--test-threads=0` produces an error][38945]
6308 * [`rustup` installs documentation by default][40526]
6309 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6310 WinDbg and Visual Studio to improve the debugging experience.
6315 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6316 workaround, either use MSVC 2015 or run vcvars.bat.
6317 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6318 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6319 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6321 * [`format!` and `Display::to_string` panic if an underlying formatting
6322 implementation returns an error][40117]. Previously the error was silently
6323 ignored. It is incorrect for `write_fmt` to return an error when writing
6325 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6326 crates were marked stable and could be accessed from the stable toolchain.
6327 * [Rust git source no longer includes vendored crates][39728]. Those that need
6328 to build with vendored crates should build from release tarballs.
6329 * [Fix inert attributes from `proc_macro_derives`][39572]
6330 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6331 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6333 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6334 existing code generally ignores the type of dead-code unless a type-hint is
6335 provided; this can cause surprising inference interactions particularly around
6336 defaulting. The new code uniformly ignores the result type of dead-code.
6337 * [Tuple-struct constructors with private fields are no longer visible][38932]
6338 * [Lifetime parameters that do not appear in the arguments are now considered
6339 early-bound][38897], resolving a soundness bug (#[32330]). The
6340 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6342 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6343 * [Make transmuting from fn item types to pointer-sized types a hard
6346 [27787]: https://github.com/rust-lang/rust/issues/27787
6347 [32330]: https://github.com/rust-lang/rust/issues/32330
6348 [34198]: https://github.com/rust-lang/rust/pull/34198
6349 [38161]: https://github.com/rust-lang/rust/pull/38161
6350 [38368]: https://github.com/rust-lang/rust/pull/38368
6351 [38584]: https://github.com/rust-lang/rust/issues/38584
6352 [38661]: https://github.com/rust-lang/rust/pull/38661
6353 [38764]: https://github.com/rust-lang/rust/pull/38764
6354 [38864]: https://github.com/rust-lang/rust/issues/38864
6355 [38897]: https://github.com/rust-lang/rust/pull/38897
6356 [38921]: https://github.com/rust-lang/rust/pull/38921
6357 [38932]: https://github.com/rust-lang/rust/pull/38932
6358 [38945]: https://github.com/rust-lang/rust/pull/38945
6359 [38981]: https://github.com/rust-lang/rust/pull/38981
6360 [39002]: https://github.com/rust-lang/rust/pull/39002
6361 [39116]: https://github.com/rust-lang/rust/pull/39116
6362 [39193]: https://github.com/rust-lang/rust/pull/39193
6363 [39265]: https://github.com/rust-lang/rust/pull/39265
6364 [39356]: https://github.com/rust-lang/rust/pull/39356
6365 [39372]: https://github.com/rust-lang/rust/pull/39372
6366 [39426]: https://github.com/rust-lang/rust/pull/39426
6367 [39431]: https://github.com/rust-lang/rust/pull/39431
6368 [39438]: https://github.com/rust-lang/rust/pull/39438
6369 [39440]: https://github.com/rust-lang/rust/pull/39440
6370 [39485]: https://github.com/rust-lang/rust/pull/39485
6371 [39491]: https://github.com/rust-lang/rust/pull/39491
6372 [39518]: https://github.com/rust-lang/rust/pull/39518
6373 [39538]: https://github.com/rust-lang/rust/pull/39538
6374 [39572]: https://github.com/rust-lang/rust/pull/39572
6375 [39633]: https://github.com/rust-lang/rust/pull/39633
6376 [39642]: https://github.com/rust-lang/rust/pull/39642
6377 [39728]: https://github.com/rust-lang/rust/pull/39728
6378 [39761]: https://github.com/rust-lang/rust/pull/39761
6379 [39788]: https://github.com/rust-lang/rust/pull/39788
6380 [39793]: https://github.com/rust-lang/rust/pull/39793
6381 [39837]: https://github.com/rust-lang/rust/pull/39837
6382 [39843]: https://github.com/rust-lang/rust/pull/39843
6383 [39851]: https://github.com/rust-lang/rust/pull/39851
6384 [39903]: https://github.com/rust-lang/rust/pull/39903
6385 [39939]: https://github.com/rust-lang/rust/pull/39939
6386 [39953]: https://github.com/rust-lang/rust/pull/39953
6387 [39960]: https://github.com/rust-lang/rust/pull/39960
6388 [39990]: https://github.com/rust-lang/rust/pull/39990
6389 [39995]: https://github.com/rust-lang/rust/pull/39995
6390 [40008]: https://github.com/rust-lang/rust/pull/40008
6391 [40009]: https://github.com/rust-lang/rust/pull/40009
6392 [40027]: https://github.com/rust-lang/rust/pull/40027
6393 [40028]: https://github.com/rust-lang/rust/pull/40028
6394 [40037]: https://github.com/rust-lang/rust/pull/40037
6395 [40117]: https://github.com/rust-lang/rust/pull/40117
6396 [40166]: https://github.com/rust-lang/rust/pull/40166
6397 [40245]: https://github.com/rust-lang/rust/pull/40245
6398 [40257]: https://github.com/rust-lang/rust/pull/40257
6399 [40261]: https://github.com/rust-lang/rust/pull/40261
6400 [40265]: https://github.com/rust-lang/rust/pull/40265
6401 [40319]: https://github.com/rust-lang/rust/pull/40319
6402 [40336]: https://github.com/rust-lang/rust/pull/40336
6403 [40526]: https://github.com/rust-lang/rust/pull/40526
6404 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6405 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6406 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6407 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6408 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6409 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6410 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6411 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6412 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6413 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6414 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6415 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6416 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6417 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6418 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6419 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6420 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6421 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6422 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6423 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6424 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6425 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6426 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6427 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6428 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6429 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6430 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6431 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6432 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6433 [ubook]: https://doc.rust-lang.org/unstable-book/
6436 Version 1.16.0 (2017-03-16)
6437 ===========================
6442 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6443 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6444 match patterns][38069]
6445 * [Clean up semantics of `self` in an import list][38313]
6446 * [`Self` may appear in `impl` headers][38920]
6447 * [`Self` may appear in struct expressions][39282]
6452 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6453 a `.rmeta` file containing only crate metadata][38571]. This can be
6454 used by tools like the Rust Language Service to perform
6455 metadata-only builds.
6456 * [Levenshtein based typo suggestions now work in most places, while
6457 previously they worked only for fields and sometimes for local
6458 variables][38927]. Together with the overhaul of "no
6459 resolution"/"unexpected resolution" errors (#[38154]) they result in
6460 large and systematic improvement in resolution diagnostics.
6461 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6463 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6464 * [`rustc` no longer attempts to provide "consider using an explicit
6465 lifetime" suggestions][37057]. They were inaccurate.
6470 * [`VecDeque::truncate`]
6471 * [`VecDeque::resize`]
6472 * [`String::insert_str`]
6473 * [`Duration::checked_add`]
6474 * [`Duration::checked_sub`]
6475 * [`Duration::checked_div`]
6476 * [`Duration::checked_mul`]
6479 * [`SocketAddr::is_ipv4`]
6480 * [`SocketAddr::is_ipv6`]
6481 * [`IpAddr::is_ipv4`]
6482 * [`IpAddr::is_ipv6`]
6484 * [`Vec::dedup_by_key`]
6485 * [`Result::unwrap_or_default`]
6486 * [`<*const T>::wrapping_offset`]
6487 * [`<*mut T>::wrapping_offset`]
6488 * `CommandExt::creation_flags`
6489 * [`File::set_permissions`]
6490 * [`String::split_off`]
6495 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6496 their argument by `Borrow` parameter][37761]
6497 * [All public types in std implement `Debug`][38006]
6498 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6499 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6500 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6502 * [std: Fix partial writes in `LineWriter`][38062]
6503 * [std: Clamp max read/write sizes on Unix][38622]
6504 * [Use more specific panic message for `&str` slicing errors][38066]
6505 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6506 functionality cannot be achieved in std currently.
6507 * [`writeln!`, like `println!`, now accepts a form with no string
6508 or formatting arguments, to just print a newline][38469]
6509 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6510 * [Reduce the size of static data in `std_unicode::tables`][38781]
6511 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6512 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6514 * [`Duration` implements `Sum`][38712]
6515 * [`String` implements `ToSocketAddrs`][39048]
6520 * [The `cargo check` command does a type check of a project without
6521 building it][cargo/3296]
6522 * [crates.io will display CI badges from Travis and AppVeyor, if
6523 specified in Cargo.toml][cargo/3546]
6524 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6525 * [Compilation profiles accept integer values for `debug`, in addition
6526 to `true` and `false`. These are passed to `rustc` as the value to
6527 `-C debuginfo`][cargo/3534]
6528 * [Implement `cargo --version --verbose`][cargo/3604]
6529 * [All builds now output 'dep-info' build dependencies compatible with
6530 make and ninja][cargo/3557]
6531 * [Build all workspace members with `build --all`][cargo/3511]
6532 * [Document all workspace members with `doc --all`][cargo/3515]
6533 * [Path deps outside workspace are not members][cargo/3443]
6538 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6539 the path to the Rust implementation][38589]
6540 * [The `armv7-linux-androideabi` target no longer enables NEON
6541 extensions, per Google's ABI guide][38413]
6542 * [The stock standard library can be compiled for Redox OS][38401]
6543 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6545 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6547 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6552 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6553 match patterns][38069]
6554 * In this release, references to uninhabited types can not be
6555 pattern-matched. This was accidentally allowed in 1.15.
6556 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6557 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6559 * [Clean up semantics of `self` in an import list][38313]
6560 * Reimplemented lifetime elision. This change was almost entirely compatible
6561 with existing code, but it did close a number of small bugs and loopholes,
6562 as well as being more accepting in some other [cases][41105].
6564 [37057]: https://github.com/rust-lang/rust/pull/37057
6565 [37761]: https://github.com/rust-lang/rust/pull/37761
6566 [38006]: https://github.com/rust-lang/rust/pull/38006
6567 [38051]: https://github.com/rust-lang/rust/pull/38051
6568 [38062]: https://github.com/rust-lang/rust/pull/38062
6569 [38622]: https://github.com/rust-lang/rust/pull/38622
6570 [38066]: https://github.com/rust-lang/rust/pull/38066
6571 [38069]: https://github.com/rust-lang/rust/pull/38069
6572 [38131]: https://github.com/rust-lang/rust/pull/38131
6573 [38154]: https://github.com/rust-lang/rust/pull/38154
6574 [38274]: https://github.com/rust-lang/rust/pull/38274
6575 [38304]: https://github.com/rust-lang/rust/pull/38304
6576 [38313]: https://github.com/rust-lang/rust/pull/38313
6577 [38327]: https://github.com/rust-lang/rust/pull/38327
6578 [38401]: https://github.com/rust-lang/rust/pull/38401
6579 [38413]: https://github.com/rust-lang/rust/pull/38413
6580 [38469]: https://github.com/rust-lang/rust/pull/38469
6581 [38559]: https://github.com/rust-lang/rust/pull/38559
6582 [38571]: https://github.com/rust-lang/rust/pull/38571
6583 [38580]: https://github.com/rust-lang/rust/pull/38580
6584 [38589]: https://github.com/rust-lang/rust/pull/38589
6585 [38670]: https://github.com/rust-lang/rust/pull/38670
6586 [38712]: https://github.com/rust-lang/rust/pull/38712
6587 [38726]: https://github.com/rust-lang/rust/pull/38726
6588 [38781]: https://github.com/rust-lang/rust/pull/38781
6589 [38798]: https://github.com/rust-lang/rust/pull/38798
6590 [38909]: https://github.com/rust-lang/rust/pull/38909
6591 [38920]: https://github.com/rust-lang/rust/pull/38920
6592 [38927]: https://github.com/rust-lang/rust/pull/38927
6593 [39048]: https://github.com/rust-lang/rust/pull/39048
6594 [39282]: https://github.com/rust-lang/rust/pull/39282
6595 [39379]: https://github.com/rust-lang/rust/pull/39379
6596 [41105]: https://github.com/rust-lang/rust/issues/41105
6597 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6598 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6599 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6600 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6601 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6602 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6603 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6604 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6605 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6606 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6607 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6608 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6609 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6610 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6611 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6612 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6613 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6614 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6615 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6616 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6617 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6618 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6619 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6620 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6621 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6622 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6623 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6624 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6625 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6628 Version 1.15.1 (2017-02-09)
6629 ===========================
6631 * [Fix IntoIter::as_mut_slice's signature][39466]
6632 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6634 [39466]: https://github.com/rust-lang/rust/pull/39466
6635 [39523]: https://github.com/rust-lang/rust/pull/39523
6638 Version 1.15.0 (2017-02-02)
6639 ===========================
6644 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6645 stable. This allows popular code-generating crates like Serde and Diesel to
6646 work ergonomically. [RFC 1681].
6647 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6648 with curly braces][36868]. Part of [RFC 1506].
6649 * [A number of minor changes to name resolution have been activated][37127].
6650 They add up to more consistent semantics, allowing for future evolution of
6651 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6652 details of what is different. The breaking changes here have been transitioned
6653 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6654 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6656 * [`?Sized` can be used in `where` clauses][37791]
6657 * [There is now a limit on the size of monomorphized types and it can be
6658 modified with the `#![type_size_limit]` crate attribute, similarly to
6659 the `#![recursion_limit]` attribute][37789]
6664 * [On Windows, the compiler will apply dllimport attributes when linking to
6665 extern functions][37973]. Additional attributes and flags can control which
6666 library kind is linked and its name. [RFC 1717].
6667 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6668 * [The `--test` flag works with procedural macro crates][38107]
6669 * [Fix `extern "aapcs" fn` ABI][37814]
6670 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6671 * [The `format!` expander recognizes incorrect `printf` and shell-style
6672 formatting directives and suggests the correct format][37613].
6673 * [Only report one error for all unused imports in an import list][37456]
6675 Compiler Performance
6676 --------------------
6678 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6679 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6680 * [Don't clone in `UnificationTable::probe`][37848]
6681 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6682 * [Use small vectors in type walker][37760]
6683 * [Macro expansion performance was improved][37701]
6684 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6685 * [Replace FNV with a faster hash function][37229]
6690 * [`std::iter::Iterator::min_by`]
6691 * [`std::iter::Iterator::max_by`]
6692 * [`std::os::*::fs::FileExt`]
6693 * [`std::sync::atomic::Atomic*::get_mut`]
6694 * [`std::sync::atomic::Atomic*::into_inner`]
6695 * [`std::vec::IntoIter::as_slice`]
6696 * [`std::vec::IntoIter::as_mut_slice`]
6697 * [`std::sync::mpsc::Receiver::try_iter`]
6698 * [`std::os::unix::process::CommandExt::before_exec`]
6699 * [`std::rc::Rc::strong_count`]
6700 * [`std::rc::Rc::weak_count`]
6701 * [`std::sync::Arc::strong_count`]
6702 * [`std::sync::Arc::weak_count`]
6703 * [`std::char::encode_utf8`]
6704 * [`std::char::encode_utf16`]
6705 * [`std::cell::Ref::clone`]
6706 * [`std::io::Take::into_inner`]
6711 * [The standard sorting algorithm has been rewritten for dramatic performance
6712 improvements][38192]. It is a hybrid merge sort, drawing influences from
6713 Timsort. Previously it was a naive merge sort.
6714 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6715 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6717 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6718 and `char_indices().last()`][37882]
6719 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6720 * [Chinese characters display correctly in `fmt::Debug`][37855]
6721 * [Derive `Default` for `Duration`][37699]
6722 * [Support creation of anonymous pipes on WinXP/2k][37677]
6723 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6724 * [Don't pass overlapped handles to processes][38835]
6729 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6730 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6731 should instead check the variable at runtime with `std::env`. That the value
6732 was set at build time was a bug, and incorrect when cross-compiling. This
6733 change is known to cause breakage.
6734 * [Add `--all` flag to `cargo test`][cargo/3221]
6735 * [Compile statically against the MSVC CRT][cargo/3363]
6736 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6737 * [Link OpenSSL statically on OSX][cargo/3311]
6738 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6739 * [Test for bad path overrides with summaries][cargo/3336]
6740 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6741 * [Fix retrying crate downloads for network errors][cargo/3348]
6742 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6743 * [Emit more info on --message-format=json][cargo/3319]
6744 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6745 * [Don't ignore errors in workspace manifest][cargo/3409]
6746 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6751 * [Test runners (binaries built with `--test`) now support a `--list` argument
6752 that lists the tests it contains][38185]
6753 * [Test runners now support a `--exact` argument that makes the test filter
6754 match exactly, instead of matching only a substring of the test name][38181]
6755 * [rustdoc supports a `--playground-url` flag][37763]
6756 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6761 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6762 continue to be used in this release by passing `--disable-rustbuild` to the
6763 configure script, but they will be deleted soon. Note that the new build
6764 system uses a different on-disk layout that will likely affect any scripts
6766 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6768 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6769 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6775 * [A number of minor changes to name resolution have been activated][37127].
6776 They add up to more consistent semantics, allowing for future evolution of
6777 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6778 details of what is different. The breaking changes here have been transitioned
6779 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6780 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6781 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6782 should instead check the variable at runtime with `std::env`. That the value
6783 was set at build time was a bug, and incorrect when cross-compiling. This
6784 change is known to cause breakage.
6785 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6786 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6787 1.10 and is now an error by default. It will become a hard error in the near
6789 * [The semantics relating modules to file system directories are changing in
6790 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6791 lint, which is a warning in this release, and will become a hard error in the
6793 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6794 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6795 the underlying iterator][37834]
6797 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6798 [33685]: https://github.com/rust-lang/rust/issues/33685
6799 [36868]: https://github.com/rust-lang/rust/pull/36868
6800 [37127]: https://github.com/rust-lang/rust/pull/37127
6801 [37229]: https://github.com/rust-lang/rust/pull/37229
6802 [37456]: https://github.com/rust-lang/rust/pull/37456
6803 [37527]: https://github.com/rust-lang/rust/pull/37527
6804 [37602]: https://github.com/rust-lang/rust/pull/37602
6805 [37613]: https://github.com/rust-lang/rust/pull/37613
6806 [37615]: https://github.com/rust-lang/rust/pull/37615
6807 [37636]: https://github.com/rust-lang/rust/pull/37636
6808 [37627]: https://github.com/rust-lang/rust/pull/37627
6809 [37642]: https://github.com/rust-lang/rust/pull/37642
6810 [37677]: https://github.com/rust-lang/rust/pull/37677
6811 [37699]: https://github.com/rust-lang/rust/pull/37699
6812 [37701]: https://github.com/rust-lang/rust/pull/37701
6813 [37705]: https://github.com/rust-lang/rust/pull/37705
6814 [37749]: https://github.com/rust-lang/rust/pull/37749
6815 [37760]: https://github.com/rust-lang/rust/pull/37760
6816 [37763]: https://github.com/rust-lang/rust/pull/37763
6817 [37764]: https://github.com/rust-lang/rust/pull/37764
6818 [37789]: https://github.com/rust-lang/rust/pull/37789
6819 [37791]: https://github.com/rust-lang/rust/pull/37791
6820 [37814]: https://github.com/rust-lang/rust/pull/37814
6821 [37817]: https://github.com/rust-lang/rust/pull/37817
6822 [37834]: https://github.com/rust-lang/rust/pull/37834
6823 [37848]: https://github.com/rust-lang/rust/pull/37848
6824 [37855]: https://github.com/rust-lang/rust/pull/37855
6825 [37882]: https://github.com/rust-lang/rust/pull/37882
6826 [37888]: https://github.com/rust-lang/rust/pull/37888
6827 [37973]: https://github.com/rust-lang/rust/pull/37973
6828 [37979]: https://github.com/rust-lang/rust/pull/37979
6829 [38086]: https://github.com/rust-lang/rust/pull/38086
6830 [38107]: https://github.com/rust-lang/rust/pull/38107
6831 [38117]: https://github.com/rust-lang/rust/pull/38117
6832 [38134]: https://github.com/rust-lang/rust/pull/38134
6833 [38146]: https://github.com/rust-lang/rust/pull/38146
6834 [38181]: https://github.com/rust-lang/rust/pull/38181
6835 [38182]: https://github.com/rust-lang/rust/pull/38182
6836 [38185]: https://github.com/rust-lang/rust/pull/38185
6837 [38192]: https://github.com/rust-lang/rust/pull/38192
6838 [38279]: https://github.com/rust-lang/rust/pull/38279
6839 [38835]: https://github.com/rust-lang/rust/pull/38835
6840 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6841 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6842 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6843 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6844 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6845 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6846 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6847 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6848 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6849 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6850 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6851 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6852 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6853 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6854 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6855 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6856 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6857 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6858 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6859 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6860 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6861 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6862 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6863 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6864 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6865 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6866 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6867 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6868 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6869 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6870 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6871 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6872 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6873 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6874 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6875 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6876 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6879 Version 1.14.0 (2016-12-22)
6880 ===========================
6885 * [`..` matches multiple tuple fields in enum variants, structs
6886 and tuples][36843]. [RFC 1492].
6887 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6888 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6889 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6890 dereferencing][36822]
6895 * [Mark enums with non-zero discriminant as non-zero][37224]
6896 * [Lower-case `static mut` names are linted like other
6897 statics and consts][37162]
6898 * [Fix ICE on some macros in const integer positions
6899 (e.g. `[u8; m!()]`)][36819]
6900 * [Improve error message and snippet for "did you mean `x`"][36798]
6901 * [Add a panic-strategy field to the target specification][36794]
6902 * [Include LLVM version in `--version --verbose`][37200]
6904 Compile-time Optimizations
6905 --------------------------
6907 * [Improve macro expansion performance][37569]
6908 * [Shrink `Expr_::ExprInlineAsm`][37445]
6909 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6910 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6911 * [Avoid more allocations when compiling html5ever][37373]
6912 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6913 * [Avoid some allocations in the macro parser][37318]
6914 * [Use a faster deflate setting][37298]
6915 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6916 during interning of slices][37270]
6917 * [Optimize `write_metadata`][37267]
6918 * [Don't process obligation forest cycles when stalled][37231]
6919 * [Avoid many `CrateConfig` clones][37161]
6920 * [Optimize `Substs::super_fold_with`][37108]
6921 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6922 * [Speed up `plug_leaks`][36917]
6927 * [`println!()`, with no arguments, prints newline][36825].
6928 Previously, an empty string was required to achieve the same.
6929 * [`Wrapping` impls standard binary and unary operators, as well as
6930 the `Sum` and `Product` iterators][37356]
6931 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6933 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6934 `VecDeque` iterators][37315]
6935 * [Improve `SipHasher` performance on small values][37312]
6936 * [Add Iterator trait TrustedLen to enable better FromIterator /
6938 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6939 * [`ReadDir` implements `Debug`][37221]
6940 * [Implement `RefUnwindSafe` for atomic types][37178]
6941 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6942 * [Avoid allocations in `Decoder::read_str`][37064]
6943 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6944 * [Impl `Debug` for raw pointers to unsized data][36880]
6945 * [Don't reuse `HashMap` random seeds][37470]
6946 * [The internal memory layout of `HashMap` is more cache-friendly, for
6947 significant improvements in some operations][36692]
6948 * [`HashMap` uses less memory on 32-bit architectures][36595]
6949 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6954 * [Expose rustc cfg values to build scripts][cargo/3243]
6955 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6956 * [Fix passing --features when testing multiple packages][cargo/3280]
6957 * [Use a single profile set per workspace][cargo/3249]
6958 * [Load `replace` sections from lock files][cargo/3220]
6959 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6964 * [rustup is the recommended Rust installation method][1.14rustup]
6965 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6966 S390x. These are [tier 2] platforms and may have major defects. Follow the
6967 instructions on the website to install, or add the targets to an existing
6968 installation with `rustup target add`. The new target triples are:
6969 - `mips-unknown-linux-gnu`
6970 - `mipsel-unknown-linux-gnu`
6971 - `mips64-unknown-linux-gnuabi64`
6972 - `mips64el-unknown-linux-gnuabi64 `
6973 - `powerpc-unknown-linux-gnu`
6974 - `powerpc64-unknown-linux-gnu`
6975 - `powerpc64le-unknown-linux-gnu`
6976 - `s390x-unknown-linux-gnu `
6977 * This release includes target (std) builds for ARM Linux running MUSL
6978 libc. These are [tier 2] platforms and may have major defects. Add the
6979 following triples to an existing rustup installation with `rustup target add`:
6980 - `arm-unknown-linux-musleabi`
6981 - `arm-unknown-linux-musleabihf`
6982 - `armv7-unknown-linux-musleabihf`
6983 * This release includes [experimental support for WebAssembly][1.14wasm], via
6984 the `wasm32-unknown-emscripten` target. This target is known to have major
6985 defects. Please test, report, and fix.
6986 * rustup no longer installs documentation by default. Run `rustup
6987 component add rust-docs` to install.
6988 * [Fix line stepping in debugger][37310]
6989 * [Enable line number debuginfo in releases][37280]
6994 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6995 * [Add support for Fuchsia OS][37313]
6996 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7001 * [A number of forward-compatibility lints used by the compiler
7002 to gradually introduce language changes have been converted
7003 to deny by default][36894]:
7004 - ["use of inaccessible extern crate erroneously allowed"][36886]
7005 - ["type parameter default erroneously allowed in invalid location"][36887]
7006 - ["detects super or self keywords at the beginning of global path"][36888]
7007 - ["two overlapping inherent impls define an item with the same name
7008 were erroneously allowed"][36889]
7009 - ["floating-point constants cannot be used in patterns"][36890]
7010 - ["constants of struct or enum type can only be used in a pattern if
7011 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7012 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7013 * [Prohibit patterns in trait methods without bodies][37378]
7014 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7015 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7016 * [The `$crate` macro variable is accepted in fewer locations][37213]
7017 * [Impls specifying extra region requirements beyond the trait
7018 they implement are rejected][37167]
7019 * [Enums may not be unsized][37111]. Unsized enums are intended to
7020 work but never have. For now they are forbidden.
7021 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7023 [tier 2]: https://forge.rust-lang.org/platform-support.html
7024 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7025 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7026 [36430]: https://github.com/rust-lang/rust/pull/36430
7027 [36595]: https://github.com/rust-lang/rust/pull/36595
7028 [36692]: https://github.com/rust-lang/rust/pull/36692
7029 [36767]: https://github.com/rust-lang/rust/pull/36767
7030 [36794]: https://github.com/rust-lang/rust/pull/36794
7031 [36798]: https://github.com/rust-lang/rust/pull/36798
7032 [36819]: https://github.com/rust-lang/rust/pull/36819
7033 [36822]: https://github.com/rust-lang/rust/pull/36822
7034 [36825]: https://github.com/rust-lang/rust/pull/36825
7035 [36843]: https://github.com/rust-lang/rust/pull/36843
7036 [36880]: https://github.com/rust-lang/rust/pull/36880
7037 [36886]: https://github.com/rust-lang/rust/issues/36886
7038 [36887]: https://github.com/rust-lang/rust/issues/36887
7039 [36888]: https://github.com/rust-lang/rust/issues/36888
7040 [36889]: https://github.com/rust-lang/rust/issues/36889
7041 [36890]: https://github.com/rust-lang/rust/issues/36890
7042 [36891]: https://github.com/rust-lang/rust/issues/36891
7043 [36892]: https://github.com/rust-lang/rust/issues/36892
7044 [36894]: https://github.com/rust-lang/rust/pull/36894
7045 [36917]: https://github.com/rust-lang/rust/pull/36917
7046 [36993]: https://github.com/rust-lang/rust/pull/36993
7047 [37037]: https://github.com/rust-lang/rust/pull/37037
7048 [37064]: https://github.com/rust-lang/rust/pull/37064
7049 [37094]: https://github.com/rust-lang/rust/pull/37094
7050 [37108]: https://github.com/rust-lang/rust/pull/37108
7051 [37111]: https://github.com/rust-lang/rust/pull/37111
7052 [37161]: https://github.com/rust-lang/rust/pull/37161
7053 [37162]: https://github.com/rust-lang/rust/pull/37162
7054 [37167]: https://github.com/rust-lang/rust/pull/37167
7055 [37178]: https://github.com/rust-lang/rust/pull/37178
7056 [37200]: https://github.com/rust-lang/rust/pull/37200
7057 [37213]: https://github.com/rust-lang/rust/pull/37213
7058 [37221]: https://github.com/rust-lang/rust/pull/37221
7059 [37224]: https://github.com/rust-lang/rust/pull/37224
7060 [37230]: https://github.com/rust-lang/rust/pull/37230
7061 [37231]: https://github.com/rust-lang/rust/pull/37231
7062 [37247]: https://github.com/rust-lang/rust/pull/37247
7063 [37267]: https://github.com/rust-lang/rust/pull/37267
7064 [37270]: https://github.com/rust-lang/rust/pull/37270
7065 [37273]: https://github.com/rust-lang/rust/pull/37273
7066 [37280]: https://github.com/rust-lang/rust/pull/37280
7067 [37298]: https://github.com/rust-lang/rust/pull/37298
7068 [37306]: https://github.com/rust-lang/rust/pull/37306
7069 [37310]: https://github.com/rust-lang/rust/pull/37310
7070 [37312]: https://github.com/rust-lang/rust/pull/37312
7071 [37313]: https://github.com/rust-lang/rust/pull/37313
7072 [37315]: https://github.com/rust-lang/rust/pull/37315
7073 [37318]: https://github.com/rust-lang/rust/pull/37318
7074 [37322]: https://github.com/rust-lang/rust/pull/37322
7075 [37326]: https://github.com/rust-lang/rust/pull/37326
7076 [37351]: https://github.com/rust-lang/rust/pull/37351
7077 [37356]: https://github.com/rust-lang/rust/pull/37356
7078 [37367]: https://github.com/rust-lang/rust/pull/37367
7079 [37373]: https://github.com/rust-lang/rust/pull/37373
7080 [37378]: https://github.com/rust-lang/rust/pull/37378
7081 [37389]: https://github.com/rust-lang/rust/pull/37389
7082 [37392]: https://github.com/rust-lang/rust/pull/37392
7083 [37427]: https://github.com/rust-lang/rust/pull/37427
7084 [37439]: https://github.com/rust-lang/rust/pull/37439
7085 [37445]: https://github.com/rust-lang/rust/pull/37445
7086 [37470]: https://github.com/rust-lang/rust/pull/37470
7087 [37569]: https://github.com/rust-lang/rust/pull/37569
7088 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7089 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7090 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7091 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7092 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7093 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7094 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7097 Version 1.13.0 (2016-11-10)
7098 ===========================
7103 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7104 errors, like the `try!` macro, described in [RFC 0243].
7105 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7106 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7107 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7108 * [Fix lifetime rules for 'if' conditions][36029]
7109 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7114 * [Add the `-C link-arg` argument][36574]
7115 * [Remove the old AST-based backend from rustc_trans][35764]
7116 * [Don't enable NEON by default on armv7 Linux][35814]
7117 * [Fix debug line number info for macro expansions][35238]
7118 * [Do not emit "class method" debuginfo for types that are not
7119 DICompositeType][36008]
7120 * [Warn about multiple conflicting #[repr] hints][34623]
7121 * [When sizing DST, don't double-count nested struct prefixes][36351]
7122 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7123 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7124 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7125 * [Expand macros without recursing to avoid stack overflows][36214]
7130 * [Replace macro backtraces with labeled local uses][35702]
7131 * [Improve error message for misplaced doc comments][33922]
7132 * [Buffer unix and lock windows to prevent message interleaving][35975]
7133 * [Update lifetime errors to specifically note temporaries][36171]
7134 * [Special case a few colors for Windows][36178]
7135 * [Suggest `use self` when such an import resolves][36289]
7136 * [Be more specific when type parameter shadows primitive type][36338]
7137 * Many minor improvements
7139 Compile-time Optimizations
7140 --------------------------
7142 * [Compute and cache HIR hashes at beginning][35854]
7143 * [Don't hash types in loan paths][36004]
7144 * [Cache projections in trans][35761]
7145 * [Optimize the parser's last token handling][36527]
7146 * [Only instantiate #[inline] functions in codegen units referencing
7147 them][36524]. This leads to big improvements in cases where crates export
7148 define many inline functions without using them directly.
7149 * [Lazily allocate TypedArena's first chunk][36592]
7150 * [Don't allocate during default HashSet creation][36734]
7157 * [`overflowing_abs`]
7158 * [`RefCell::try_borrow`]
7159 * [`RefCell::try_borrow_mut`]
7164 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7165 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7167 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7168 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7169 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7170 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7171 * [Use arc4rand on FreeBSD][35884]
7172 * [memrchr: Correct aligned offset computation][35969]
7173 * [Improve Demangling of Rust Symbols][36059]
7174 * [Use monotonic time in condition variables][35048]
7175 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7176 * [Implement conversion traits for `char`][35755]
7177 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7178 * [Zero first byte of CString on drop][36264]
7179 * [Inherit overflow checks for sum and product][36372]
7180 * [Add missing Eq implementations][36423]
7181 * [Implement `Debug` for `DirEntry`][36631]
7182 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7184 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7185 * [Implement more traits for `std::io::ErrorKind`][35911]
7186 * [Optimize BinaryHeap bounds checking][36072]
7187 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7188 `extend_with_element`][36355]
7189 * [Fix overflow checking in unsigned pow()][34942]
7194 * This release includes security fixes to both curl and OpenSSL.
7195 * [Fix transitive doctests when panic=abort][cargo/3021]
7196 * [Add --all-features flag to cargo][cargo/3038]
7197 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7198 * [Don't parse the home directory more than once][cargo/3078]
7199 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7200 * [Update OpenSSL to 1.0.2j][cargo/3121]
7201 * [Add license and license_file to cargo metadata output][cargo/3110]
7202 * [Make crates-io registry URL optional in config; ignore all changes to
7203 source.crates-io][cargo/3089]
7204 * [Don't download dependencies from other platforms][cargo/3123]
7205 * [Build transitive dev-dependencies when needed][cargo/3125]
7206 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7207 * [Avoid updating registry when adding existing deps][cargo/3144]
7208 * [Warn about path overrides that won't work][cargo/3136]
7209 * [Use workspaces during `cargo install`][cargo/3146]
7210 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7211 * [Add --message-format flag][cargo/3000]
7212 * [Pass target environment for rustdoc][cargo/3205]
7213 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7214 * [Update curl and curl-sys][cargo/3241]
7215 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7220 * [rustdoc: Add the `--sysroot` argument][36586]
7221 * [rustdoc: Fix a couple of issues with the search results][35655]
7222 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7223 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7224 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7229 * [Remove unmaintained style guide][35124]
7230 * [Add s390x support][36369]
7231 * [Initial work at Haiku OS support][36727]
7232 * [Add mips-uclibc targets][35734]
7233 * [Crate-ify compiler-rt into compiler-builtins][35021]
7234 * [Add rustc version info (git hash + date) to dist tarball][36213]
7235 * Many documentation improvements
7240 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7241 * [Deny (by default) transmuting from fn item types to pointer-sized
7242 types][34923]. Continuing the long transition to zero-sized fn items,
7244 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7246 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7247 * [Fix lifetime rules for 'if' conditions][36029].
7248 * [Inherit overflow checks for sum and product][36372].
7249 * [Forbid user-defined macros named "macro_rules"][36730].
7251 [33922]: https://github.com/rust-lang/rust/pull/33922
7252 [34623]: https://github.com/rust-lang/rust/pull/34623
7253 [34923]: https://github.com/rust-lang/rust/pull/34923
7254 [34942]: https://github.com/rust-lang/rust/pull/34942
7255 [35021]: https://github.com/rust-lang/rust/pull/35021
7256 [35048]: https://github.com/rust-lang/rust/pull/35048
7257 [35074]: https://github.com/rust-lang/rust/pull/35074
7258 [35124]: https://github.com/rust-lang/rust/pull/35124
7259 [35234]: https://github.com/rust-lang/rust/pull/35234
7260 [35238]: https://github.com/rust-lang/rust/pull/35238
7261 [35354]: https://github.com/rust-lang/rust/pull/35354
7262 [35559]: https://github.com/rust-lang/rust/pull/35559
7263 [35585]: https://github.com/rust-lang/rust/pull/35585
7264 [35627]: https://github.com/rust-lang/rust/pull/35627
7265 [35655]: https://github.com/rust-lang/rust/pull/35655
7266 [35702]: https://github.com/rust-lang/rust/pull/35702
7267 [35707]: https://github.com/rust-lang/rust/pull/35707
7268 [35728]: https://github.com/rust-lang/rust/pull/35728
7269 [35734]: https://github.com/rust-lang/rust/pull/35734
7270 [35755]: https://github.com/rust-lang/rust/pull/35755
7271 [35761]: https://github.com/rust-lang/rust/pull/35761
7272 [35764]: https://github.com/rust-lang/rust/pull/35764
7273 [35814]: https://github.com/rust-lang/rust/pull/35814
7274 [35854]: https://github.com/rust-lang/rust/pull/35854
7275 [35871]: https://github.com/rust-lang/rust/pull/35871
7276 [35884]: https://github.com/rust-lang/rust/pull/35884
7277 [35911]: https://github.com/rust-lang/rust/pull/35911
7278 [35969]: https://github.com/rust-lang/rust/pull/35969
7279 [35975]: https://github.com/rust-lang/rust/pull/35975
7280 [36004]: https://github.com/rust-lang/rust/pull/36004
7281 [36008]: https://github.com/rust-lang/rust/pull/36008
7282 [36014]: https://github.com/rust-lang/rust/pull/36014
7283 [36029]: https://github.com/rust-lang/rust/pull/36029
7284 [36059]: https://github.com/rust-lang/rust/pull/36059
7285 [36072]: https://github.com/rust-lang/rust/pull/36072
7286 [36101]: https://github.com/rust-lang/rust/pull/36101
7287 [36104]: https://github.com/rust-lang/rust/pull/36104
7288 [36171]: https://github.com/rust-lang/rust/pull/36171
7289 [36173]: https://github.com/rust-lang/rust/pull/36173
7290 [36178]: https://github.com/rust-lang/rust/pull/36178
7291 [36213]: https://github.com/rust-lang/rust/pull/36213
7292 [36214]: https://github.com/rust-lang/rust/pull/36214
7293 [36264]: https://github.com/rust-lang/rust/pull/36264
7294 [36266]: https://github.com/rust-lang/rust/pull/36266
7295 [36289]: https://github.com/rust-lang/rust/pull/36289
7296 [36338]: https://github.com/rust-lang/rust/pull/36338
7297 [36351]: https://github.com/rust-lang/rust/pull/36351
7298 [36355]: https://github.com/rust-lang/rust/pull/36355
7299 [36369]: https://github.com/rust-lang/rust/pull/36369
7300 [36372]: https://github.com/rust-lang/rust/pull/36372
7301 [36423]: https://github.com/rust-lang/rust/pull/36423
7302 [36482]: https://github.com/rust-lang/rust/pull/36482
7303 [36505]: https://github.com/rust-lang/rust/pull/36505
7304 [36524]: https://github.com/rust-lang/rust/pull/36524
7305 [36527]: https://github.com/rust-lang/rust/pull/36527
7306 [36551]: https://github.com/rust-lang/rust/pull/36551
7307 [36574]: https://github.com/rust-lang/rust/pull/36574
7308 [36586]: https://github.com/rust-lang/rust/pull/36586
7309 [36592]: https://github.com/rust-lang/rust/pull/36592
7310 [36631]: https://github.com/rust-lang/rust/pull/36631
7311 [36721]: https://github.com/rust-lang/rust/pull/36721
7312 [36727]: https://github.com/rust-lang/rust/pull/36727
7313 [36730]: https://github.com/rust-lang/rust/pull/36730
7314 [36734]: https://github.com/rust-lang/rust/pull/36734
7315 [36754]: https://github.com/rust-lang/rust/pull/36754
7316 [36995]: https://github.com/rust-lang/rust/pull/36995
7317 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7318 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7319 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7320 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7321 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7322 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7323 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7324 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7325 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7326 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7327 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7328 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7329 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7330 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7331 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7332 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7333 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7334 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7335 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7336 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7337 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7338 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7339 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7340 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7341 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7342 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7343 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7344 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7345 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7346 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7347 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7348 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7351 Version 1.12.1 (2016-10-20)
7352 ===========================
7357 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7358 * [Confusion with double negation and booleans][36856]
7359 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7360 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7361 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7362 * [Corrupted memory after updated to 1.12][36936]
7363 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7364 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7365 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7367 [36381]: https://github.com/rust-lang/rust/issues/36381
7368 [36856]: https://github.com/rust-lang/rust/issues/36856
7369 [36875]: https://github.com/rust-lang/rust/issues/36875
7370 [36924]: https://github.com/rust-lang/rust/issues/36924
7371 [36926]: https://github.com/rust-lang/rust/issues/36926
7372 [36936]: https://github.com/rust-lang/rust/issues/36936
7373 [37026]: https://github.com/rust-lang/rust/issues/37026
7374 [37112]: https://github.com/rust-lang/rust/issues/37112
7375 [37153]: https://github.com/rust-lang/rust/issues/37153
7378 Version 1.12.0 (2016-09-29)
7379 ===========================
7384 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7385 This translation pass is far simpler than the previous AST->LLVM pass, and
7386 creates opportunities to perform new optimizations directly on the MIR. It
7387 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7388 * [`rustc` presents a new, more readable error format, along with
7389 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7390 Most common editors supporting Rust have been updated to work with it. It was
7391 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7396 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7397 This translation pass is far simpler than the previous AST->LLVM pass, and
7398 creates opportunities to perform new optimizations directly on the MIR. It
7399 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7400 * [Print the Rust target name, not the LLVM target name, with
7401 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7402 * [The computation of `TypeId` is correct in some cases where it was previously
7403 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7404 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7405 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7406 `--print relocation-models`, and `--print code-models` print the available
7407 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7408 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7409 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7410 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7411 These targets produce statically-linked binaries. There are no binary release
7417 * [`rustc` presents a new, more readable error format, along with
7418 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7419 Most common editors supporting Rust have been updated to work with it. It was
7420 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7421 * [In error descriptions, references are now described in plain English,
7422 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7423 * [In error type descriptions, unknown numeric types are named `{integer}` or
7424 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7425 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7430 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7431 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7432 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7433 useful](https://github.com/rust-lang/rust/pull/34908)
7434 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7435 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7436 * [Semicolons are properly required as statement delimiters inside
7437 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7438 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7443 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7444 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7445 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7446 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7447 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7448 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7449 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7450 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7451 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7452 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7453 Both on Unix and Windows.
7454 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7455 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7456 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7457 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7458 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7459 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7460 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7461 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7466 * [The `format!` macro and friends now allow a single argument to be formatted
7467 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7468 * [The lifetime bounds on `[T]::binary_search_by` and
7469 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7470 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7471 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7472 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7473 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7474 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7475 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7476 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7477 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7478 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7479 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7480 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7481 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7482 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7483 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7484 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7485 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7486 * [`mpsc::sync_channel` `Receiver`s return any available message before
7487 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7488 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7489 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7494 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7495 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7496 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7497 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7498 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7499 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7500 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7501 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7502 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7503 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7504 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7505 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7506 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7507 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7508 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7509 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7514 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7515 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7520 * [Test binaries now support a `--test-threads` argument to specify the number
7521 of threads used to run tests, and which acts the same as the
7522 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7523 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7524 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7525 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7526 * [Rust releases now come with source packages that can be installed by rustup
7527 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7528 The resulting source code can be used by tools and IDES, located in the
7529 sysroot under `lib/rustlib/src`.
7534 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7535 * Many minor improvements to the documentation.
7536 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7541 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7542 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7543 * [When formatting strings, if "precision" is specified, the "fill",
7544 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7545 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7548 Version 1.11.0 (2016-08-18)
7549 ===========================
7554 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7555 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7556 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7557 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7562 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7563 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7564 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7565 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7566 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7567 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7568 (in libcore - previously stabilized in libstd)
7569 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7570 (in libcore - previously stabilized in libstd)
7571 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7572 (in libcore - previously stabilized in libstd)
7573 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7574 (in libcore - previously stabilized in libstd)
7575 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7576 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7577 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7578 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7583 * [The `thread_local!` macro supports multiple definitions in a single
7584 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7585 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7586 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7587 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7588 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7589 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7590 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7591 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7596 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7597 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7598 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7599 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7600 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7601 and `-vv` prints warnings for all crates.
7602 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7603 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7604 This provides room for expansion by arbitrary tools.
7605 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7606 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7607 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7608 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7609 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7610 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7611 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7616 * [Caching projections speeds up type check dramatically for some
7617 workloads](https://github.com/rust-lang/rust/pull/33816)
7618 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7619 This hasher is faster, but is believed to provide sufficient
7620 protection from collision attacks.
7621 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7626 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7627 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7628 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7629 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7630 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7635 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7636 * [When emitting debug info, rustc emits frame pointers for closures,
7637 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7638 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7639 * Many more errors have been given error codes and extended
7641 * API documentation continues to be improved, with many new examples
7646 * [rustc no longer hangs when dependencies recursively re-export
7647 submodules](https://github.com/rust-lang/rust/pull/34542)
7648 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7649 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7650 rewritten](https://github.com/rust-lang/rust/pull/33895)
7651 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7652 No targets use this yet, but it works toward AVR support.
7657 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7658 * [The new follow-set rules that place restrictions on `macro_rules!`
7659 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7660 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7661 and has been a warning since 1.10.
7662 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7663 This causes breakage in some corner cases.
7666 Version 1.10.0 (2016-07-07)
7667 ===========================
7672 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7673 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7674 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7675 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7676 * [`panic!` can be converted to a runtime abort with the
7677 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7678 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7679 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7680 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7681 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7682 Note that Cargo does not yet directly support cdylibs.
7687 * `os::windows::fs::OpenOptionsExt::access_mode`
7688 * `os::windows::fs::OpenOptionsExt::share_mode`
7689 * `os::windows::fs::OpenOptionsExt::custom_flags`
7690 * `os::windows::fs::OpenOptionsExt::attributes`
7691 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7692 * `os::unix::fs::OpenOptionsExt::custom_flags`
7693 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7694 * `Default for sync::Weak`
7695 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7696 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7697 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7698 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7699 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7700 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7701 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7702 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7703 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7704 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7705 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7706 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7707 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7708 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7709 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7710 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7711 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7712 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7713 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7714 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7715 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7716 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7717 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7718 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7719 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7720 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7721 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7722 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7723 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7724 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7725 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7726 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7727 * Read/Write/RawFd impls for `UnixStream`
7728 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7729 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7730 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7731 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7732 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7733 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7734 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7735 * RawFd impls for `UnixListener`
7736 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7737 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7738 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7739 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7740 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7741 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7742 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7743 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7744 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7745 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7746 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7747 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7748 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7749 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7750 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7751 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7752 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7753 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7754 * RawFd impls for `UnixDatagram`
7755 * `{BTree,Hash}Map::values_mut`
7756 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7761 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7762 The semantics of this minor method are subtle and probably not what
7764 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7765 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7766 will fall back to `/dev/urandom` temporarily to avoid blocking
7767 during early boot](https://github.com/rust-lang/rust/pull/33086).
7768 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7769 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7770 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7771 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7772 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7773 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7774 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7778 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7779 This controls the runtime behavior of the `panic!` macro
7780 and can be either "unwind" (the default), or "abort".
7781 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7782 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7783 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7784 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7785 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7786 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7787 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7788 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7789 By default they are retried twice, which can be customized with the
7790 `net.retry` value in `.cargo/config`.
7791 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7792 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7793 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7794 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7795 Makes it possible to install multiple crates in parallel.
7796 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7797 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7798 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7799 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7800 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7801 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7806 * [rustc memory usage was reduced by refactoring the context used for
7807 type checking](https://github.com/rust-lang/rust/pull/33425).
7808 * [Speed up creation of `HashMap`s by caching the random keys used
7809 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7810 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7811 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7812 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7813 10x faster than the previous lookup tables.
7814 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7819 * Many incremental improvements to documentation and rustdoc.
7820 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7821 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7822 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7823 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7824 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7825 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7826 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7831 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7832 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7833 * [`std` no longer prints backtraces on platforms where the running
7834 module must be loaded with `env::current_exe`, which can't be relied
7835 on](https://github.com/rust-lang/rust/pull/33554).
7836 * This release includes std binaries for the i586-unknown-linux-gnu,
7837 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7838 i586 target is for old x86 hardware without SSE2, and the armv7
7839 target is for Android running on modern ARM architectures.
7840 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7841 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7842 * [On Unix the runtime aborts by calling `libc::abort` instead of
7843 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7844 * [Rust is now bootstrapped from the previous release of Rust,
7845 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7850 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7851 * [`target_env` for Linux ARM targets is just `gnu`, not
7852 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7853 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7854 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7855 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7856 Affects how macros are parsed.
7857 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7858 * [Feature-gated attributes on macro-generated macro invocations are
7859 now rejected](https://github.com/rust-lang/rust/pull/32791).
7860 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7861 This caused some minor changes to type inference.
7864 Version 1.9.0 (2016-05-26)
7865 ==========================
7870 * The `#[deprecated]` attribute when applied to an API will generate
7871 warnings when used. The warnings may be suppressed with
7872 `#[allow(deprecated)]`. [RFC 1270].
7873 * [`fn` item types are zero sized, and each `fn` names a unique
7874 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7875 `transmute` on a `fn` type will generate a warning for a few cycles,
7876 then will be converted to an error.
7877 * [Field and method resolution understand visibility, so private
7878 fields and methods cannot prevent the proper use of public fields
7879 and methods][1.9fv].
7880 * [The parser considers unicode codepoints in the
7881 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7887 * [`std::panic::catch_unwind`] (renamed from `recover`)
7888 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7889 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7890 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7891 * [`str::is_char_boundary`]
7892 * [`<*const T>::as_ref`]
7893 * [`<*mut T>::as_ref`]
7894 * [`<*mut T>::as_mut`]
7895 * [`AsciiExt::make_ascii_uppercase`]
7896 * [`AsciiExt::make_ascii_lowercase`]
7897 * [`char::decode_utf16`]
7898 * [`char::DecodeUtf16`]
7899 * [`char::DecodeUtf16Error`]
7900 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7901 * [`BTreeSet::take`]
7902 * [`BTreeSet::replace`]
7905 * [`HashSet::replace`]
7907 * [`OsString::with_capacity`]
7908 * [`OsString::clear`]
7909 * [`OsString::capacity`]
7910 * [`OsString::reserve`]
7911 * [`OsString::reserve_exact`]
7912 * [`OsStr::is_empty`]
7914 * [`std::os::unix::thread`]
7917 * [`JoinHandleExt::as_pthread_t`]
7918 * [`JoinHandleExt::into_pthread_t`]
7919 * [`HashSet::hasher`]
7920 * [`HashMap::hasher`]
7921 * [`CommandExt::exec`]
7922 * [`File::try_clone`]
7923 * [`SocketAddr::set_ip`]
7924 * [`SocketAddr::set_port`]
7925 * [`SocketAddrV4::set_ip`]
7926 * [`SocketAddrV4::set_port`]
7927 * [`SocketAddrV6::set_ip`]
7928 * [`SocketAddrV6::set_port`]
7929 * [`SocketAddrV6::set_flowinfo`]
7930 * [`SocketAddrV6::set_scope_id`]
7931 * [`slice::copy_from_slice`]
7932 * [`ptr::read_volatile`]
7933 * [`ptr::write_volatile`]
7934 * [`OpenOptions::create_new`]
7935 * [`TcpStream::set_nodelay`]
7936 * [`TcpStream::nodelay`]
7937 * [`TcpStream::set_ttl`]
7938 * [`TcpStream::ttl`]
7939 * [`TcpStream::set_only_v6`]
7940 * [`TcpStream::only_v6`]
7941 * [`TcpStream::take_error`]
7942 * [`TcpStream::set_nonblocking`]
7943 * [`TcpListener::set_ttl`]
7944 * [`TcpListener::ttl`]
7945 * [`TcpListener::set_only_v6`]
7946 * [`TcpListener::only_v6`]
7947 * [`TcpListener::take_error`]
7948 * [`TcpListener::set_nonblocking`]
7949 * [`UdpSocket::set_broadcast`]
7950 * [`UdpSocket::broadcast`]
7951 * [`UdpSocket::set_multicast_loop_v4`]
7952 * [`UdpSocket::multicast_loop_v4`]
7953 * [`UdpSocket::set_multicast_ttl_v4`]
7954 * [`UdpSocket::multicast_ttl_v4`]
7955 * [`UdpSocket::set_multicast_loop_v6`]
7956 * [`UdpSocket::multicast_loop_v6`]
7957 * [`UdpSocket::set_multicast_ttl_v6`]
7958 * [`UdpSocket::multicast_ttl_v6`]
7959 * [`UdpSocket::set_ttl`]
7960 * [`UdpSocket::ttl`]
7961 * [`UdpSocket::set_only_v6`]
7962 * [`UdpSocket::only_v6`]
7963 * [`UdpSocket::join_multicast_v4`]
7964 * [`UdpSocket::join_multicast_v6`]
7965 * [`UdpSocket::leave_multicast_v4`]
7966 * [`UdpSocket::leave_multicast_v6`]
7967 * [`UdpSocket::take_error`]
7968 * [`UdpSocket::connect`]
7969 * [`UdpSocket::send`]
7970 * [`UdpSocket::recv`]
7971 * [`UdpSocket::set_nonblocking`]
7976 * [`std::sync::Once` is poisoned if its initialization function
7978 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7979 * [Most types implement `fmt::Debug`][1.9db].
7980 * [The default buffer size used by `BufReader` and `BufWriter` was
7981 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7982 used by other languages.
7983 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7984 `Duration` additionally implements `*=` and `/=`][1.9ta].
7985 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7986 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7987 * [`Chain` implements `BufRead`][1.9ch].
7988 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7993 * [Cargo can now run concurrently][1.9cc].
7994 * [Top-level overrides allow specific revisions of crates to be
7995 overridden through the entire crate graph][1.9ct]. This is intended
7996 to make upgrades easier for large projects, by allowing crates to be
7997 forked temporarily until they've been upgraded and republished.
7998 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7999 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8000 on the commandline][1.9cf]. `rustc` arguments can also be specified
8001 in the `build.rustflags` configuration key.
8006 * [The time complexity of comparing variables for equivalence during type
8007 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8008 to major compilation time improvement in some scenarios.
8009 * [`ToString` is specialized for `str`, giving it the same performance
8010 as `to_owned`][1.9ts].
8011 * [Spawning processes with `Command::output` no longer creates extra
8013 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8014 for C-like enums][1.9cl].
8019 * [Passing the `--quiet` flag to a test runner will produce
8020 much-abbreviated output][1.9q].
8021 * The Rust Project now publishes std binaries for the
8022 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8023 `i586-pc-windows-msvc` targets.
8028 * [`std::sync::Once` is poisoned if its initialization function
8030 * [It is illegal to define methods with the same name in overlapping
8031 inherent `impl` blocks][1.9sn].
8032 * [`fn` item types are zero sized, and each `fn` names a unique
8033 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8034 `transmute` on a `fn` type will generate a warning for a few cycles,
8035 then will be converted to an error.
8036 * [Improvements to const evaluation may trigger new errors when integer
8037 literals are out of range][1.9ce].
8040 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8041 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8042 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8043 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8044 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8045 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8046 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8047 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8048 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8049 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8050 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8051 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8052 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8053 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8054 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8055 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8056 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8057 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8058 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8059 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8060 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8061 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8062 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8063 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8064 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8065 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8066 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8067 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8068 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8069 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8070 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8071 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8072 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8073 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8074 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8075 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8076 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8077 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8078 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8079 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8080 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8081 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8082 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8083 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8084 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8085 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8086 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8087 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8088 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8089 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8090 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8091 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8092 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8093 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8094 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8095 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8096 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8097 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8098 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8099 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8100 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8101 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8102 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8103 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8104 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8105 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8106 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8107 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8108 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8109 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8110 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8111 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8112 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8113 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8114 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8115 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8116 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8117 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8118 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8119 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8120 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8121 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8122 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8123 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8124 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8125 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8126 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8127 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8128 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8129 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8130 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8131 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8132 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8133 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8134 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8135 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8136 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8137 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8138 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8139 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8140 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8141 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8142 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8143 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8144 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8145 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8146 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8147 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8148 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8149 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8152 Version 1.8.0 (2016-04-14)
8153 ==========================
8158 * Rust supports overloading of compound assignment statements like
8159 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8160 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8161 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8163 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8164 addition to the non-braced form, `struct Foo;`. [RFC 218].
8170 * [`str::encode_utf16`] (renamed from `utf16_units`)
8171 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8174 * [`ptr::drop_in_place`]
8176 * [`time::SystemTime`]
8178 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8179 * [`Instant::elapsed`]
8180 * [`SystemTime::now`]
8181 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8182 * [`SystemTime::elapsed`]
8183 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8184 * [`SystemTimeError`]
8185 * [`SystemTimeError::duration`]
8186 * Various impls for `SystemTimeError`
8188 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8189 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8190 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8191 * [The `write!` and `writeln!` macros correctly emit errors if any of
8192 their arguments can't be formatted][1.8w].
8193 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8194 * [The Unix-specific `raw` modules, which contain a number of
8195 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8196 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8197 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8198 across platforms was making it difficult to implement `std`
8199 correctly. Those that need these definitions should use the `libc`
8201 * The Unix-specific `MetadataExt` traits, including
8202 `os::unix::fs::MetadataExt`, which expose values such as inode
8203 numbers [no longer return platform-specific types][1.8r], but
8204 instead return widened integers. [RFC 1415].
8205 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8206 * [Atomic loads and stores are not volatile][1.8a].
8207 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8212 * [Inlining hash functions lead to a 3% compile-time improvement in
8213 some workloads][1.8h].
8214 * When using jemalloc, its symbols are [unprefixed so that it
8215 overrides the libc malloc implementation][1.8h]. This means that for
8216 rustc, LLVM is now using jemalloc, which results in a 6%
8217 compile-time improvement on a specific workload.
8218 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8223 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8224 i686-pc-windows-msvc is now considered a tier-1 platform.
8225 * [The `--print targets` flag prints a list of supported targets][1.8t].
8226 * [The `--print cfg` flag prints the `cfg`s defined for the current
8228 * [`rustc` can be built with an new Cargo-based build system, written
8229 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8230 build system. To enable it configure with `configure --rustbuild`.
8231 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8232 variants while also indicating the total number of missing variants
8233 if more than 3][1.8m].
8234 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8235 * The Rust Project now publishes binary releases of the standard
8236 library for a number of tier-2 targets:
8237 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8238 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8239 `x86_64-rumprun-netbsd`. These can be installed with
8240 tools such as [multirust][1.8mr].
8245 * [`cargo init` creates a new Cargo project in the current
8246 directory][1.8ci]. It is otherwise like `cargo new`.
8247 * [Cargo has configuration keys for `-v` and
8248 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8249 `[term]` section of `.cargo/config`.
8250 * [Configuration keys that evaluate to strings or integers can be set
8251 via environment variables][1.8ce]. For example the `build.jobs` key
8252 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8253 precedence over config files.
8254 * [Target-specific dependencies support Rust `cfg` syntax for
8255 describing targets][1.8cfg] so that dependencies for multiple
8256 targets can be specified together. [RFC 1361].
8257 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8258 `RUSTDOC` take precedence over the `build.target-dir`,
8259 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8260 * [The child process tree is killed on Windows when Cargo is
8262 * [The `build.target` configuration value sets the target platform,
8263 like `--target`][1.8ct].
8268 * [Unstable compiler flags have been further restricted][1.8u]. Since
8269 1.0 `-Z` flags have been considered unstable, and other flags that
8270 were considered unstable additionally required passing `-Z
8271 unstable-options` to access. Unlike unstable language and library
8272 features though, these options have been accessible on the stable
8273 release channel. Going forward, *new unstable flags will not be
8274 available on the stable release channel*, and old unstable flags
8275 will warn about their usage. In the future, all unstable flags will
8276 be unavailable on the stable release channel.
8277 * [It is no longer possible to `match` on empty enum variants using
8278 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8279 * The Unix-specific `MetadataExt` traits, including
8280 `os::unix::fs::MetadataExt`, which expose values such as inode
8281 numbers [no longer return platform-specific types][1.8r], but
8282 instead return widened integers. [RFC 1415].
8283 * [Modules sourced from the filesystem cannot appear within arbitrary
8284 blocks, but only within other modules][1.8mf].
8285 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8286 * On Unix, [stack overflow triggers a runtime abort instead of a
8288 * [`Command::spawn` and its equivalents return an error if any of
8289 its command-line arguments contain interior `NUL`s][1.8n].
8290 * [Tuple and unit enum variants from other crates are in the type
8292 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8293 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8294 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8295 instead of `foo.lib`.
8298 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8299 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8300 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8301 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8302 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8303 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8304 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8305 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8306 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8307 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8308 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8309 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8310 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8311 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8312 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8313 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8314 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8315 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8316 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8317 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8318 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8319 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8320 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8321 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8322 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8323 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8324 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8325 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8326 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8327 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8328 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8329 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8330 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8331 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8332 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8333 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8334 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8335 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8336 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8337 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8338 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8339 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8340 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8341 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8342 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8343 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8344 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8345 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8346 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8347 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8348 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8349 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8350 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8351 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8352 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8353 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8354 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8355 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8356 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8357 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8360 Version 1.7.0 (2016-03-03)
8361 ==========================
8368 * [`Path::strip_prefix`] (renamed from relative_from)
8369 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8371 * [`Ipv4Addr::is_loopback`]
8372 * [`Ipv4Addr::is_private`]
8373 * [`Ipv4Addr::is_link_local`]
8374 * [`Ipv4Addr::is_multicast`]
8375 * [`Ipv4Addr::is_broadcast`]
8376 * [`Ipv4Addr::is_documentation`]
8378 * [`Ipv6Addr::is_unspecified`]
8379 * [`Ipv6Addr::is_loopback`]
8380 * [`Ipv6Addr::is_multicast`]
8383 * [`Vec::as_mut_slice`]
8385 * [`String::as_str`]
8386 * [`String::as_mut_str`]
8388 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8390 * `<[T]>::`[`sort_by_key`]
8391 * checked, saturated, and overflowing operations
8392 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8393 * [`i32::saturating_mul`]
8394 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8395 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8396 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8397 * [`u32::saturating_mul`]
8398 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8399 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8400 * and checked, saturated, and overflowing operations for other primitive types
8402 * [`ffi::IntoStringError`]
8403 * [`CString::into_string`]
8404 * [`CString::into_bytes`]
8405 * [`CString::into_bytes_with_nul`]
8406 * `From<CString> for Vec<u8>`
8408 * [`IntoStringError::into_cstring`]
8409 * [`IntoStringError::utf8_error`]
8410 * `Error for IntoStringError`
8412 * [`std::hash::BuildHasher`]
8413 * [`BuildHasher::Hasher`]
8414 * [`BuildHasher::build_hasher`]
8415 * [`std::hash::BuildHasherDefault`]
8416 * [`HashMap::with_hasher`]
8417 * [`HashMap::with_capacity_and_hasher`]
8418 * [`HashSet::with_hasher`]
8419 * [`HashSet::with_capacity_and_hasher`]
8420 * [`std::collections::hash_map::RandomState`]
8421 * [`RandomState::new`]
8422 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8423 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8424 from bytes is faster.
8425 * [The performance of `LineWriter` (and thus `io::stdout`) was
8426 improved by using `memchr` to search for newlines][1.7m].
8427 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8428 `f64` variants were stabilized previously.
8429 * [`BTreeMap` was rewritten to use less memory and improve the performance
8430 of insertion and iteration, the latter by as much as 5x][1.7bm].
8431 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8432 covariant over their contained type][1.7bt].
8433 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8434 over their contained type][1.7ll].
8435 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8437 * [`Any` is implemented for unsized types][1.7a].
8438 * [`Hash` is implemented for `Duration`][1.7h].
8443 * [When running tests with `--test`, rustdoc will pass `--cfg`
8444 arguments to the compiler][1.7dt].
8445 * [The compiler is built with RPATH information by default][1.7rpa].
8446 This means that it will be possible to run `rustc` when installed in
8447 unusual configurations without configuring the dynamic linker search
8449 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8450 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8451 over `LD_LIBRARY_PATH`.
8456 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8457 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8458 * [The `rerun-if-changed` build script directive no longer causes the
8459 build script to incorrectly run twice in certain scenarios][1.7rr].
8464 * Soundness fixes to the interactions between associated types and
8465 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8466 code that violates the new rules. This is a significant change that
8467 is known to break existing code, so it has emitted warnings for the
8468 new error cases since 1.4 to give crate authors time to adapt. The
8469 details of what is changing are subtle; read the RFC for more.
8470 * [Several bugs in the compiler's visibility calculations were
8471 fixed][1.7v]. Since this was found to break significant amounts of
8472 code, the new errors will be emitted as warnings for several release
8473 cycles, under the `private_in_public` lint.
8474 * Defaulted type parameters were accidentally accepted in positions
8475 that were not intended. In this release, [defaulted type parameters
8476 appearing outside of type definitions will generate a
8477 warning][1.7d], which will become an error in future releases.
8478 * [Parsing "." as a float results in an error instead of 0][1.7p].
8479 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8480 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8482 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8483 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8484 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8485 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8486 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8487 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8488 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8489 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8490 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8491 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8492 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8493 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8494 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8495 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8496 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8497 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8498 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8499 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8500 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8501 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8502 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8503 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8504 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8505 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8506 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8507 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8508 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8509 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8510 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8511 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8512 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8513 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8514 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8515 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8516 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8517 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8518 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8519 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8520 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8521 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8522 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8523 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8524 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8525 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8526 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8527 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8528 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8529 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8530 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8531 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8532 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8533 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8534 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8535 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8536 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8537 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8538 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8539 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8540 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8541 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8542 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8543 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8544 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8545 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8546 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8547 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8548 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8549 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8550 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8551 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8552 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8553 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8554 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8555 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8556 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8557 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8558 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8559 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8560 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8563 Version 1.6.0 (2016-01-21)
8564 ==========================
8569 * The `#![no_std]` attribute causes a crate to not be linked to the
8570 standard library, but only the [core library][1.6co], as described
8571 in [RFC 1184]. The core library defines common types and traits but
8572 has no platform dependencies whatsoever, and is the basis for Rust
8573 software in environments that cannot support a full port of the
8574 standard library, such as operating systems. Most of the core
8575 library is now stable.
8581 [`Read::read_exact`],
8582 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8583 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8584 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8585 [`os::unix::fs::DirBuilderExt`],
8586 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8587 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8588 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8589 [`collections::hash_map::Drain`],
8590 [`collections::hash_map::HashMap::drain`],
8591 [`collections::hash_set::Drain`],
8592 [`collections::hash_set::HashSet::drain`],
8593 [`collections::binary_heap::Drain`],
8594 [`collections::binary_heap::BinaryHeap::drain`],
8595 [`Vec::extend_from_slice`] (renamed from `push_all`),
8596 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8597 [`RwLock::into_inner`],
8598 [`Iterator::min_by_key`] (renamed from `min_by`),
8599 [`Iterator::max_by_key`] (renamed from `max_by`).
8600 * The [core library][1.6co] is stable, as are most of its APIs.
8601 * [The `assert_eq!` macro supports arguments that don't implement
8602 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8604 * Several timer functions that take duration in milliseconds [are
8605 deprecated in favor of those that take `Duration`][1.6ms]. These
8606 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8607 `thread::park_timeout_ms`.
8608 * The algorithm by which `Vec` reserves additional elements was
8609 [tweaked to not allocate excessive space][1.6a] while still growing
8611 * `From` conversions are [implemented from integers to floats][1.6f]
8612 in cases where the conversion is lossless. Thus they are not
8613 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8614 or `f64`. They are also not implemented for `isize` and `usize`
8615 because the implementations would be platform-specific. `From` is
8616 also implemented from `f32` to `f64`.
8617 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8618 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8619 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8620 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8622 * Sorting slices that are already sorted [is 50% faster in some
8628 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8629 * Cargo build scripts can specify their dependencies by emitting the
8630 [`rerun-if-changed`][1.6rr] key.
8631 * crates.io will reject publication of crates with dependencies that
8632 have a wildcard version constraint. Crates with wildcard
8633 dependencies were seen to cause a variety of problems, as described
8634 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8636 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8637 release folder. A variety of artifacts that Cargo failed to clean
8638 are now correctly deleted.
8643 * The `unreachable_code` lint [warns when a function call's argument
8645 * The parser indicates [failures that may be caused by
8646 confusingly-similar Unicode characters][1.6uc]
8647 * Certain macro errors [are reported at definition time][1.6m], not
8653 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8654 environment variable when locating crates. This was a pre-cargo
8655 feature for integrating with the package manager that was
8656 accidentally never removed.
8657 * [A number of bugs were fixed in the privacy checker][1.6p] that
8658 could cause previously-accepted code to break.
8659 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8660 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8661 struct pattern syntax (`Foo(..)`) can no longer be used to match
8662 unit structs. This is a warning now, but will become an error in
8663 future releases. Patterns that share the same name as a const are
8665 * A bug was fixed that causes [rustc not to apply default type
8666 parameters][1.6xc] when resolving certain method implementations of
8667 traits defined in other crates.
8669 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8670 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8671 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8672 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8673 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8674 [1.6co]: http://doc.rust-lang.org/core/index.html
8675 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8676 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8677 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8678 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8679 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8680 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8681 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8682 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8683 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8684 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8685 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8686 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8687 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8688 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8689 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8690 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8691 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8692 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8693 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8694 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8695 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8696 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8697 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8698 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8699 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8700 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8701 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8702 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8703 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8704 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8705 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8706 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8707 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8708 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8709 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8710 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8711 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8712 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8713 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8714 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8715 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8718 Version 1.5.0 (2015-12-10)
8719 ==========================
8721 * ~700 changes, numerous bugfixes
8727 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8728 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8729 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8730 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8731 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8732 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8733 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8734 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8735 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8736 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8737 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8738 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8739 [`Path::read_link`], [`Path::symlink_metadata`],
8740 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8741 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8742 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8743 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8744 [`slice::split_first_mut`], [`slice::split_first`],
8745 [`slice::split_last_mut`], [`slice::split_last`],
8746 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8747 [`str::MatchIndices`], [`str::RMatchIndices`],
8748 [`str::match_indices`], [`str::rmatch_indices`],
8749 [`str::slice_mut_unchecked`], [`string::ParseError`].
8750 * Rust applications hosted on crates.io can be installed locally to
8751 `~/.cargo/bin` with the [`cargo install`] command. Among other
8752 things this makes it easier to augment Cargo with new subcommands:
8753 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8754 invoked as `cargo foo`.
8755 * Crates with wildcard (`*`) dependencies will [emit warnings when
8756 published][1.5w]. In 1.6 it will no longer be possible to publish
8757 crates with wildcard dependencies.
8762 * The rules determining when a particular lifetime must outlive
8763 a particular value (known as '[dropck]') have been [modified
8764 to not rely on parametricity][1.5p].
8765 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8766 and `Arc`][1.5a]. Because these smart pointer types implement
8767 `Deref`, this causes breakage in cases where the interior type
8768 contains methods of the same name.
8769 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8770 that they could drop their content. Soundness fix.
8771 * All method invocations are [properly checked][1.5wf1] for
8772 [well-formedness][1.5wf2]. Soundness fix.
8773 * Traits whose supertraits contain `Self` are [not object
8774 safe][1.5o]. Soundness fix.
8775 * Target specifications support a [`no_default_libraries`][1.5nd]
8776 setting that controls whether `-nodefaultlibs` is passed to the
8777 linker, and in turn the `is_like_windows` setting no longer affects
8778 the `-nodefaultlibs` flag.
8779 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8780 * The `#[inline]` and `#[repr]` attributes [can only appear
8781 in valid locations][1.5at].
8782 * Native libraries linked from the local crate are [passed to
8783 the linker before native libraries from upstream crates][1.5nl].
8784 * Two rarely-used attributes, `#[no_debug]` and
8785 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8786 * Negation of unsigned integers, which has been a warning for
8787 several releases, [is now behind a feature gate and will
8788 generate errors][1.5nu].
8789 * The parser accidentally accepted visibility modifiers on
8790 enum variants, a bug [which has been fixed][1.5ev].
8791 * [A bug was fixed that allowed `use` statements to import unstable
8797 * When evaluating expressions at compile-time that are not
8798 compile-time constants (const-evaluating expressions in non-const
8799 contexts), incorrect code such as overlong bitshifts and arithmetic
8800 overflow will [generate a warning instead of an error][1.5ce],
8801 delaying the error until runtime. This will allow the
8802 const-evaluator to be expanded in the future backwards-compatibly.
8803 * The `improper_ctypes` lint [no longer warns about using `isize` and
8804 `usize` in FFI][1.5ict].
8809 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8811 * `Default` is [implemented for mutable slices][1.5d].
8812 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8813 * There are now `From` conversions [between floating point
8814 types][1.5f] where the conversions are lossless.
8815 * There are now `From` conversions [between integer types][1.5i] where
8816 the conversions are lossless.
8817 * [`fs::Metadata` implements `Clone`][1.5fs].
8818 * The `parse` method [accepts a leading "+" when parsing
8820 * [`AsMut` is implemented for `Vec`][1.5am].
8821 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8822 been optimized][1.5cf] and no longer rely on the default impl.
8823 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8824 `unsafe extern "C"` function types now [implement `Clone`,
8825 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8826 `fmt::Debug` for up to 12 arguments][1.5fp].
8827 * [Dropping `Vec`s is much faster in unoptimized builds when the
8828 element types don't implement `Drop`][1.5dv].
8829 * A bug that caused in incorrect behavior when [combining `VecDeque`
8830 with zero-sized types][1.5vdz] was resolved.
8831 * [`PartialOrd` for slices is faster][1.5po].
8836 * [Crate metadata size was reduced by 20%][1.5md].
8837 * [Improvements to code generation reduced the size of libcore by 3.3
8838 MB and rustc's memory usage by 18MB][1.5m].
8839 * [Improvements to deref translation increased performance in
8840 unoptimized builds][1.5dr].
8841 * Various errors in trait resolution [are deduplicated to only be
8842 reported once][1.5te].
8843 * Rust has preliminary [support for rumprun kernels][1.5rr].
8844 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8846 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8847 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8848 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8849 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8850 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8851 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8852 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8853 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8854 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8855 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8856 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8857 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8858 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8859 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8860 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8861 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8862 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8863 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8864 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8865 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8866 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8867 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8868 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8869 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8870 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8871 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8872 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8873 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8874 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8875 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8876 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8877 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8878 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8879 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8880 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8881 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8882 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8883 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8884 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8885 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8886 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8887 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8888 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8889 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8890 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8891 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8892 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8893 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8894 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8895 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8896 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8897 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8898 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8899 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8900 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8901 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8902 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8903 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8904 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8905 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8906 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8907 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8908 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8909 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8910 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8911 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8912 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8913 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8914 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8915 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8916 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8917 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8918 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8919 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8920 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8921 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8922 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8923 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8924 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8925 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8926 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8927 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8928 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8929 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8930 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8931 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8932 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8933 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8934 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8936 Version 1.4.0 (2015-10-29)
8937 ==========================
8939 * ~1200 changes, numerous bugfixes
8944 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8945 GNU) are now supported and recommended for use.
8950 * [Several changes have been made to fix type soundness and improve
8951 the behavior of associated types][sound]. See [RFC 1214]. Although
8952 we have mostly introduced these changes as warnings this release, to
8953 become errors next release, there are still some scenarios that will
8954 see immediate breakage.
8955 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8956 line breaks in addition to `\n`][crlf].
8957 * [Loans of `'static` lifetime extend to the end of a function][stat].
8958 * [`str::parse` no longer introduces avoidable rounding error when
8959 parsing floating point numbers. Together with earlier changes to
8960 float formatting/output, "round trips" like f.to_string().parse()
8961 now preserve the value of f exactly. Additionally, leading plus
8962 signs are now accepted][fp3].
8968 * `use` statements that import multiple items [can now rename
8969 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8970 * [Binops work correctly on fat pointers][binfat].
8971 * `pub extern crate`, which does not behave as expected, [issues a
8972 warning][pec] until a better solution is found.
8977 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8978 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8979 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8980 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8981 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8982 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8983 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8984 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8985 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8986 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8987 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8988 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8989 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8990 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8991 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8992 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8993 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8994 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8996 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8997 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8998 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8999 `f64::from_str_radix`.
9000 * [Reverse-searching strings is faster with the 'two-way'
9002 * [`std::io::copy` allows `?Sized` arguments][cc].
9003 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9004 [override `count`, `nth` and `last` with an *O*(1)
9005 implementation][it].
9006 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9007 * [`IntoRawFd` has been added to the Unix-specific prelude,
9008 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9010 * [`Extend<String>` and `FromIterator<String` are both implemented for
9012 * [`IntoIterator` is implemented for references to `Option` and
9014 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9015 Copy`][ext] as part of [RFC 839]. This will cause type inference
9016 breakage in rare situations.
9017 * [`BinaryHeap` implements `Debug`][bh2].
9018 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9020 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9021 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9022 * [String comparison is faster][faststr].
9023 * `&mut T` where `T: std::fmt::Write` [also implements
9024 `std::fmt::Write`][mutw].
9025 * [A stable regression in `VecDeque::push_back` and other
9026 capacity-altering methods that caused panics for zero-sized types
9028 * [Function pointers implement traits for up to 12 parameters][fp2].
9033 * The compiler [no longer uses the 'morestack' feature to prevent
9034 stack overflow][mm]. Instead it uses guard pages and stack
9035 probes (though stack probes are not yet implemented on any platform
9037 * [The compiler matches traits faster when projections are involved][p].
9038 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9040 * [Cargo now displays useful information about what its doing during
9041 `cargo update`][cu].
9043 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9044 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9045 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9046 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9047 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9048 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9049 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9050 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9051 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9052 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9053 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9054 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9055 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9056 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9057 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9058 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9059 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9060 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9061 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9062 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9063 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9064 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9065 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9066 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9067 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9068 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9069 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9070 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9071 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9072 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9073 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9074 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9075 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9076 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9077 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9078 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9079 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9080 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9081 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9082 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9083 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9084 [bh2]: https://github.com/rust-lang/rust/pull/28156
9085 [binfat]: https://github.com/rust-lang/rust/pull/28270
9086 [bm]: https://github.com/rust-lang/rust/pull/28197
9087 [cc]: https://github.com/rust-lang/rust/pull/27531
9088 [crlf]: https://github.com/rust-lang/rust/pull/28034
9089 [cu]: https://github.com/rust-lang/cargo/pull/1931
9090 [d]: https://github.com/rust-lang/rust/pull/27825
9091 [dep]: https://github.com/rust-lang/rust/pull/28339
9092 [es]: https://github.com/rust-lang/rust/pull/27956
9093 [ext]: https://github.com/rust-lang/rust/pull/28094
9094 [faststr]: https://github.com/rust-lang/rust/pull/28338
9095 [ffi]: https://github.com/rust-lang/rust/pull/28779
9096 [fp]: https://github.com/rust-lang/rust/pull/28268
9097 [fp2]: https://github.com/rust-lang/rust/pull/28560
9098 [fp3]: https://github.com/rust-lang/rust/pull/27307
9099 [i]: https://github.com/rust-lang/rust/pull/27451
9100 [into2]: https://github.com/rust-lang/rust/pull/28039
9101 [it]: https://github.com/rust-lang/rust/pull/27652
9102 [mm]: https://github.com/rust-lang/rust/pull/27338
9103 [mutw]: https://github.com/rust-lang/rust/pull/28368
9104 [sound]: https://github.com/rust-lang/rust/pull/27641
9105 [p]: https://github.com/rust-lang/rust/pull/27866
9106 [pec]: https://github.com/rust-lang/rust/pull/28486
9107 [pr]: https://github.com/rust-lang/rust/pull/27896
9108 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9109 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9110 [s]: https://github.com/rust-lang/rust/pull/27474
9111 [stab]: https://github.com/rust-lang/rust/pull/28339
9112 [stat]: https://github.com/rust-lang/rust/pull/28321
9113 [vd]: https://github.com/rust-lang/rust/pull/28494
9115 Version 1.3.0 (2015-09-17)
9116 ==============================
9118 * ~900 changes, numerous bugfixes
9123 * The [new object lifetime defaults][nold] have been [turned
9124 on][nold2] after a cycle of warnings about the change. Now types
9125 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9126 being interpreted as `&'a Box<Trait+'a>` to `&'a
9127 Box<Trait+'static>`.
9128 * [The Rustonomicon][nom] is a new book in the official documentation
9129 that dives into writing unsafe Rust.
9130 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9131 timekeeping is employed by other std APIs, as well as out-of-tree
9137 * The [new object lifetime defaults][nold] have been [turned
9138 on][nold2] after a cycle of warnings about the change.
9139 * There is a known [regression][lr] in how object lifetime elision is
9140 interpreted, the proper solution for which is undetermined.
9141 * The `#[prelude_import]` attribute, an internal implementation
9142 detail, was accidentally stabilized previously. [It has been put
9143 behind the `prelude_import` feature gate][pi]. This change is
9144 believed to break no existing code.
9145 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9146 [more sane for dynamically sized types][dst3]. Code that relied on
9147 the previous behavior is thought to be broken.
9148 * The `dropck` rules, which checks that destructors can't access
9149 destroyed values, [have been updated][dropck] to match the
9150 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9151 cause some previously-compiling code to no longer build.
9156 * The [new object lifetime defaults][nold] have been [turned
9157 on][nold2] after a cycle of warnings about the change.
9158 * Semicolons may [now follow types and paths in
9159 macros](https://github.com/rust-lang/rust/pull/27000).
9160 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9161 [more sane for dynamically sized types][dst3]. Code that relied on
9162 the previous behavior is not known to exist, and suspected to be
9164 * `'static` variables [may now be recursive][st].
9165 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9166 implementations correctly.
9167 * The `dropck` rules, which checks that destructors can't access
9168 destroyed values, [have been updated][dropck] to match the
9174 * The [`Duration`] API, [has been stabilized][ds], as well as the
9175 `std::time` module, which presently contains only `Duration`.
9176 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9177 * The owned C string, [`CString`], implements [`Borrow`] and the
9178 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9179 these allow C strings to be borrowed and cloned in generic code.
9180 * [`CStr`] implements [`Debug`].
9181 * [`AtomicPtr`] implements [`Debug`].
9182 * [`Error`] trait objects [can be downcast to their concrete types][e]
9183 in many common configurations, using the [`is`], [`downcast`],
9184 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9186 * Searching for substrings now [employs the two-way algorithm][search]
9187 instead of doing a naive search. This gives major speedups to a
9188 number of methods, including [`contains`][sc], [`find`][sf],
9189 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9190 [`ends_with`][sew] are also faster.
9191 * The performance of `PartialEq` for slices is [much faster][ps].
9192 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9193 is overridden and optimized by the implementations for scalars.
9194 * The [`Hasher`] trait now has a number of specialized `write_*`
9195 methods for primitive types, for efficiency.
9196 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9197 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9198 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9199 of [`std::error::Error::cause`][iec] also delegates to the inner
9201 * [`process::Child`][pc] gained the [`id`] method, which returns a
9202 `u32` representing the platform-specific process identifier.
9203 * The [`connect`] method on slices is deprecated, replaced by the new
9204 [`join`] method (note that both of these are on the *unstable*
9205 [`SliceConcatExt`] trait, but through the magic of the prelude are
9206 available to stable code anyway).
9207 * The [`Div`] operator is implemented for [`Wrapping`] types.
9208 * [`DerefMut` is implemented for `String`][dms].
9209 * Performance of SipHash (the default hasher for `HashMap`) is
9210 [better for long data][sh].
9211 * [`AtomicPtr`] implements [`Send`].
9212 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9213 are now [specialized to use uninitialized buffers for increased
9215 * Lifetime parameters of foreign functions [are now resolved
9221 * Rust can now, with some coercion, [produce programs that run on
9222 Windows XP][xp], though XP is not considered a supported platform.
9223 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9224 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9225 recommended for use in 1.3, though should be fully-functional
9226 in the [64-bit 1.4 beta][b14].
9227 * On Fedora-based systems installation will [properly configure the
9228 dynamic linker][fl].
9229 * The compiler gained many new extended error descriptions, which can
9230 be accessed with the `--explain` flag.
9231 * The `dropck` pass, which checks that destructors can't access
9232 destroyed values, [has been rewritten][27261]. This fixes some
9233 soundness holes, and as such will cause some previously-compiling
9234 code to no longer build.
9235 * `rustc` now uses [LLVM to write archive files where possible][ar].
9236 Eventually this will eliminate the compiler's dependency on the ar
9238 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9239 supported FreeBSD on x86_64).
9240 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9241 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9243 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9244 will kill the process instead of leaking][nlp].
9246 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9247 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9248 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9249 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9250 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9251 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9252 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9253 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9254 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9255 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9256 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9257 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9258 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9259 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9260 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9261 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9262 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9263 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9264 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9265 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9266 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9267 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9268 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9269 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9270 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9271 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9272 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9273 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9274 [ar]: https://github.com/rust-lang/rust/pull/26926
9275 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9276 [dms]: https://github.com/rust-lang/rust/pull/26241
9277 [27261]: https://github.com/rust-lang/rust/pull/27261
9278 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9279 [ds]: https://github.com/rust-lang/rust/pull/26818
9280 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9281 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9282 [dst3]: https://github.com/rust-lang/rust/pull/27351
9283 [e]: https://github.com/rust-lang/rust/pull/24793
9284 [f]: https://github.com/rust-lang/rust/pull/26588
9285 [26959]: https://github.com/rust-lang/rust/pull/26959
9286 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9287 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9288 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9289 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9290 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9291 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9292 [lic]: https://github.com/rust-lang/rust/pull/26583
9293 [lnu]: https://github.com/rust-lang/rust/pull/27026
9294 [lr]: https://github.com/rust-lang/rust/issues/27248
9295 [lum]: https://github.com/rust-lang/rust/pull/26378
9296 [lur]: https://github.com/rust-lang/rust/pull/26783
9297 [nlp]: https://github.com/rust-lang/rust/pull/27176
9298 [nold2]: https://github.com/rust-lang/rust/pull/27045
9299 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9300 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9301 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9302 [pi]: https://github.com/rust-lang/rust/pull/26699
9303 [ps]: https://github.com/rust-lang/rust/pull/26884
9304 [rte]: https://github.com/rust-lang/rust/pull/26950
9305 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9306 [search]: https://github.com/rust-lang/rust/pull/26327
9307 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9308 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9309 [sh]: https://github.com/rust-lang/rust/pull/27280
9310 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9311 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9312 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9313 [st]: https://github.com/rust-lang/rust/pull/26630
9314 [win1]: https://github.com/rust-lang/rust/pull/26569
9315 [win2]: https://github.com/rust-lang/rust/pull/26741
9316 [win3]: https://github.com/rust-lang/rust/pull/26741
9317 [win4]: https://github.com/rust-lang/rust/pull/27210
9318 [xp]: https://github.com/rust-lang/rust/pull/26569
9320 Version 1.2.0 (2015-08-07)
9321 ==========================
9323 * ~1200 changes, numerous bugfixes
9328 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9329 like `Rc` to contain types without a fixed size, arrays and trait
9330 objects, finally enabling use of `Rc<[T]>` and completing the
9331 implementation of DST.
9332 * [Parallel codegen][parcodegen] is now working again, which can
9333 substantially speed up large builds in debug mode; It also gets
9334 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9335 jobs). It's not enabled by default, but will be "in the near
9336 future". It can be activated with the `-C codegen-units=N` flag to
9338 * This is the first release with [experimental support for linking
9339 with the MSVC linker and lib C on Windows (instead of using the GNU
9340 variants via MinGW)][win]. It is yet recommended only for the most
9341 intrepid Rustaceans.
9342 * Benchmark compilations are showing a 30% improvement in
9343 bootstrapping over 1.1.
9348 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9349 unicode case mapping, which is a previously-planned change in
9350 behavior and considered a bugfix.
9351 * [`mem::align_of`] now specifies [the *minimum alignment* for
9352 T][align], which is usually the alignment programs are interested
9353 in, and the same value reported by clang's
9354 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9356 * [The `#[packed]` attribute is no longer silently accepted by the
9357 compiler][packed]. This attribute did nothing and code that
9358 mentioned it likely did not work as intended.
9359 * Associated type defaults are [now behind the
9360 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9361 defaults *did not work*, but could be mentioned syntactically. As
9362 such this breakage has minimal impact.
9367 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9368 matching against dereferenceable values.
9373 * The [`Extend`] trait, which grows a collection from an iterator, is
9374 implemented over iterators of references, for `String`, `Vec`,
9375 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9376 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9377 * The [`iter::once`] function returns an iterator that yields a single
9378 element, and [`iter::empty`] returns an iterator that yields no
9380 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9381 over substring matches.
9382 * [`Cell`] and [`RefCell`] both implement `Eq`.
9383 * A number of methods for wrapping arithmetic are added to the
9384 integral types, [`wrapping_div`], [`wrapping_rem`],
9385 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9386 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9387 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9388 type.. It is illegal for the default arithmetic operations in Rust
9389 to overflow; the desire to wrap must be explicit.
9390 * The `{:#?}` formatting specifier [displays the alternate,
9391 pretty-printed][debugfmt] form of the `Debug` formatter. This
9392 feature was actually introduced prior to 1.0 with little
9394 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9395 for writing data to formatted strings, similar to [`io::Write`].
9396 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9397 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9398 are used by code generators to emit implementations of [`Debug`].
9399 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9400 methods that convert case, following Unicode case mapping.
9401 * It is now easier to handle poisoned locks. The [`PoisonError`]
9402 type, returned by failing lock operations, exposes `into_inner`,
9403 `get_ref`, and `get_mut`, which all give access to the inner lock
9404 guard, and allow the poisoned lock to continue to operate. The
9405 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9406 poisoned lock without attempting to take the lock.
9407 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9408 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9409 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9410 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9412 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9418 * `rustc` employs smarter heuristics for guessing at [typos].
9419 * `rustc` emits more efficient code for [no-op conversions between
9420 unsafe pointers][nop].
9421 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9422 resulting in faster compile times and smaller code.
9424 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9425 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9426 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9427 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9428 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9429 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9430 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9431 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9432 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9433 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9434 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9435 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9436 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9437 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9438 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9439 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9440 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9441 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9442 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9443 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9444 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9445 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9446 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9447 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9448 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9449 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9450 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9451 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9452 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9453 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9454 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9455 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9456 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9457 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9458 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9459 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9460 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9461 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9462 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9463 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9464 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9465 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9466 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9467 [align]: https://github.com/rust-lang/rust/pull/25646
9468 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9469 [typos]: https://github.com/rust-lang/rust/pull/26087
9470 [nop]: https://github.com/rust-lang/rust/pull/26336
9471 [fat]: https://github.com/rust-lang/rust/pull/26411
9472 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9473 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9474 [packed]: https://github.com/rust-lang/rust/pull/25541
9475 [ad]: https://github.com/rust-lang/rust/pull/27382
9476 [win]: https://github.com/rust-lang/rust/pull/25350
9478 Version 1.1.0 (2015-06-25)
9479 =========================
9481 * ~850 changes, numerous bugfixes
9486 * The [`std::fs` module has been expanded][fs] to expand the set of
9487 functionality exposed:
9488 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9489 don't incur a syscall on some platforms.
9490 * A `symlink_metadata` function has been added.
9491 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9492 access to all underlying information.
9493 * The compiler now contains extended explanations of many errors. When an error
9494 with an explanation occurs the compiler suggests using the `--explain` flag
9495 to read the explanation. Error explanations are also [available online][err-index].
9496 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9497 well as other work, the time to bootstrap the compiler decreased by
9503 * The [`str::split_whitespace`] method splits a string on unicode
9504 whitespace boundaries.
9505 * On both Windows and Unix, new extension traits provide conversion of
9506 I/O types to and from the underlying system handles. On Unix, these
9507 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9508 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9509 `TcpListener`, and `UpdSocket`. Further implementations for
9510 `std::process` will be stabilized later.
9511 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9512 Windows, symlinks can be created with
9513 `std::os::windows::symlink_dir` and
9514 `std::os::windows::symlink_file`.
9515 * The `mpsc::Receiver` type can now be converted into an iterator with
9516 `into_iter` on the [`IntoIterator`] trait.
9517 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9518 implementation of the [`From`] trait.
9519 * The `Debug` implementation for `RangeFull` [creates output that is
9520 more consistent with other implementations][rf].
9521 * [`Debug` is implemented for `File`][file].
9522 * The `Default` implementation for `Arc` [no longer requires `Sync +
9524 * [The `Iterator` methods `count`, `nth`, and `last` have been
9525 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9526 * Incorrect handling of paths on Windows has been improved in both the
9527 compiler and the standard library.
9528 * [`AtomicPtr` gained a `Default` implementation][ap].
9529 * In accordance with Rust's policy on arithmetic overflow `abs` now
9530 [panics on overflow when debug assertions are enabled][abs].
9531 * The [`Cloned`] iterator, which was accidentally left unstable for
9532 1.0 [has been stabilized][c].
9533 * The [`Incoming`] iterator, which iterates over incoming TCP
9534 connections, and which was accidentally unnamable in 1.0, [is now
9535 properly exported][inc].
9536 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9537 `sift_up` or `sift_down` panic][bh].
9538 * The [`split_off`] method of `LinkedList` [no longer corrupts
9539 the list in certain scenarios][ll].
9544 * Type checking performance [has improved notably][sk] with
9545 [multiple improvements][pre].
9546 * The compiler [suggests code changes][ch] for more errors.
9547 * rustc and it's build system have experimental support for [building
9548 toolchains against MUSL][m] instead of glibc on Linux.
9549 * The compiler defines the `target_env` cfg value, which is used for
9550 distinguishing toolchains that are otherwise for the same
9551 platform. Presently this is set to `gnu` for common GNU Linux
9552 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9553 * The [`cargo rustc`][crc] command invokes a build with custom flags
9555 * [Android executables are always position independent][pie].
9556 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9557 with `Drop`][24935].
9559 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9560 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9561 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9562 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9563 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9564 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9565 [rf]: https://github.com/rust-lang/rust/pull/24491
9566 [err-index]: https://doc.rust-lang.org/error-index.html
9567 [sk]: https://github.com/rust-lang/rust/pull/24615
9568 [pre]: https://github.com/rust-lang/rust/pull/25323
9569 [file]: https://github.com/rust-lang/rust/pull/24598
9570 [ch]: https://github.com/rust-lang/rust/pull/24683
9571 [arc]: https://github.com/rust-lang/rust/pull/24695
9572 [si]: https://github.com/rust-lang/rust/pull/24701
9573 [ap]: https://github.com/rust-lang/rust/pull/24834
9574 [m]: https://github.com/rust-lang/rust/pull/24777
9575 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9576 [crc]: https://github.com/rust-lang/cargo/pull/1568
9577 [pie]: https://github.com/rust-lang/rust/pull/24953
9578 [abs]: https://github.com/rust-lang/rust/pull/25441
9579 [c]: https://github.com/rust-lang/rust/pull/25496
9580 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9581 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9582 [inc]: https://github.com/rust-lang/rust/pull/25522
9583 [bh]: https://github.com/rust-lang/rust/pull/25856
9584 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9585 [ll]: https://github.com/rust-lang/rust/pull/26022
9586 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9587 [24935]: https://github.com/rust-lang/rust/pull/24935
9589 Version 1.0.0 (2015-05-15)
9590 ========================
9592 * ~1500 changes, numerous bugfixes
9597 * The vast majority of the standard library is now `#[stable]`. It is
9598 no longer possible to use unstable features with a stable build of
9600 * Many popular crates on [crates.io] now work on the stable release
9602 * Arithmetic on basic integer types now [checks for overflow in debug
9608 * Several [restrictions have been added to trait coherence][coh] in
9609 order to make it easier for upstream authors to change traits
9610 without breaking downstream code.
9611 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9612 improve error messages and macro behavior. For example, `0b1234` is
9613 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9614 * Trait bounds [are always invariant][inv], eliminating the need for
9615 the `PhantomFn` and `MarkerTrait` lang items, which have been
9617 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9618 "foo" as bar` syntax has been replaced with `extern crate foo as
9619 bar`, and Cargo now automatically translates "-" in *package* names
9620 to underscore for the crate name.
9621 * [Lifetime shadowing is an error][lt].
9622 * [`Send` no longer implies `'static`][send-rfc].
9623 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9624 `MyType::default()`.
9625 * Primitive types [now have inherent methods][prim-inherent],
9626 obviating the need for extension traits like `SliceExt`.
9627 * Methods with `Self: Sized` in their `where` clause are [considered
9628 object-safe][self-sized], allowing many extension traits like
9629 `IteratorExt` to be merged into the traits they extended.
9630 * You can now [refer to associated types][assoc-where] whose
9631 corresponding trait bounds appear only in a `where` clause.
9632 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9633 like `Send` and `Sync` are now library-defined.
9634 * A [Reflect trait][reflect] was introduced, which means that
9635 downcasting via the `Any` trait is effectively limited to concrete
9636 types. This helps retain the potentially-important "parametricity"
9637 property: generic code cannot behave differently for different type
9638 arguments except in minor ways.
9639 * The `unsafe_destructor` feature is now deprecated in favor of the
9640 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9646 * The `thread_local` module [has been renamed to `std::thread`][th].
9647 * The methods of `IteratorExt` [have been moved to the `Iterator`
9648 trait itself][23300].
9649 * Several traits that implement Rust's conventions for type
9650 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9651 [centralized in the `std::convert` module][con].
9652 * The `FromError` trait [was removed in favor of `From`][fe].
9653 * The basic sleep function [has moved to
9654 `std::thread::sleep_ms`][slp].
9655 * The `splitn` function now takes an `n` parameter that represents the
9656 number of items yielded by the returned iterator [instead of the
9657 number of 'splits'][spl].
9658 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9659 * [Derived implementations of `PartialOrd` now order enums according
9660 to their explicitly-assigned discriminants][po].
9661 * [Methods for searching strings are generic over `Pattern`s][pat],
9662 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9664 * [In method resolution, object methods are resolved before inherent
9666 * [`String::from_str` has been deprecated in favor of the `From` impl,
9667 `String::from`][24517].
9668 * [`io::Error` implements `Sync`][ios].
9669 * [The `words` method on `&str` has been replaced with
9670 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9672 * The new path and IO modules are complete and `#[stable]`. This
9673 was the major library focus for this cycle.
9674 * The path API was [revised][path-normalize] to normalize `.`,
9675 adjusting the tradeoffs in favor of the most common usage.
9676 * A large number of remaining APIs in `std` were also stabilized
9677 during this cycle; about 75% of the non-deprecated API surface
9679 * The new [string pattern API][string-pattern] landed, which makes
9680 the string slice API much more internally consistent and flexible.
9681 * A new set of [generic conversion traits][conversion] replaced
9682 many existing ad hoc traits.
9683 * Generic numeric traits were [completely removed][num-traits]. This
9684 was made possible thanks to inherent methods for primitive types,
9685 and the removal gives maximal flexibility for designing a numeric
9686 hierarchy in the future.
9687 * The `Fn` traits are now related via [inheritance][fn-inherit]
9688 and provide ergonomic [blanket implementations][fn-blanket].
9689 * The `Index` and `IndexMut` traits were changed to
9690 [take the index by value][index-value], enabling code like
9691 `hash_map["string"]` to work.
9692 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9693 `Copy` data is known to be `Clone` as well.
9698 * Many errors now have extended explanations that can be accessed with
9699 the `--explain` flag to `rustc`.
9700 * Many new examples have been added to the standard library
9702 * rustdoc has received a number of improvements focused on completion
9704 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9705 * Much headway was made on ecosystem-wide CI, making it possible
9706 to [compare builds for breakage][ci-compare].
9709 [crates.io]: http://crates.io
9710 [clo]: https://github.com/rust-lang/rust/pull/24034
9711 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9712 [con]: https://github.com/rust-lang/rust/pull/23875
9713 [cr]: https://github.com/rust-lang/rust/pull/23419
9714 [fe]: https://github.com/rust-lang/rust/pull/23879
9715 [23300]: https://github.com/rust-lang/rust/pull/23300
9716 [inv]: https://github.com/rust-lang/rust/pull/23938
9717 [ios]: https://github.com/rust-lang/rust/pull/24133
9718 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9719 [lt]: https://github.com/rust-lang/rust/pull/24057
9720 [meth]: https://github.com/rust-lang/rust/pull/24056
9721 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9722 [po]: https://github.com/rust-lang/rust/pull/24270
9723 [24517]: https://github.com/rust-lang/rust/pull/24517
9724 [slp]: https://github.com/rust-lang/rust/pull/23949
9725 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9726 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9727 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9728 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9729 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9730 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9731 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9732 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9733 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9734 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9735 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9736 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9737 [reflect]: https://github.com/rust-lang/rust/pull/23712
9738 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9739 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9740 [index-value]: https://github.com/rust-lang/rust/pull/23601
9741 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9742 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9743 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9744 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9745 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9746 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9749 Version 1.0.0-alpha.2 (2015-02-20)
9750 =====================================
9752 * ~1300 changes, numerous bugfixes
9756 * The various I/O modules were [overhauled][io-rfc] to reduce
9757 unnecessary abstractions and provide better interoperation with
9758 the underlying platform. The old `io` module remains temporarily
9760 * The standard library now [participates in feature gating][feat],
9761 so use of unstable libraries now requires a `#![feature(...)]`
9762 attribute. The impact of this change is [described on the
9763 forum][feat-forum]. [RFC][feat-rfc].
9767 * `for` loops [now operate on the `IntoIterator` trait][into],
9768 which eliminates the need to call `.iter()`, etc. to iterate
9769 over collections. There are some new subtleties to remember
9770 though regarding what sort of iterators various types yield, in
9771 particular that `for foo in bar { }` yields values from a move
9772 iterator, destroying the original collection. [RFC][into-rfc].
9773 * Objects now have [default lifetime bounds][obj], so you don't
9774 have to write `Box<Trait+'static>` when you don't care about
9775 storing references. [RFC][obj-rfc].
9776 * In types that implement `Drop`, [lifetimes must outlive the
9777 value][drop]. This will soon make it possible to safely
9778 implement `Drop` for types where `#[unsafe_destructor]` is now
9779 required. Read the [gorgeous RFC][drop-rfc] for details.
9780 * The fully qualified <T as Trait>::X syntax lets you set the Self
9781 type for a trait method or associated type. [RFC][ufcs-rfc].
9782 * References to types that implement `Deref<U>` now [automatically
9783 coerce to references][deref] to the dereferenced type `U`,
9784 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9785 should eliminate many unsightly uses of `&*`, as when converting
9786 from references to vectors into references to
9787 slices. [RFC][deref-rfc].
9788 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9789 `|:|`) is obsolete and closure kind is inferred from context.
9790 * [`Self` is a keyword][Self].
9794 * The `Show` and `String` formatting traits [have been
9795 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9796 their related purposes. Automatically getting a string
9797 conversion to use with `format!("{:?}", something_to_debug)` is
9798 now written `#[derive(Debug)]`.
9799 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9800 OsStr}`, provide strings in platform-specific encodings for easier
9801 interop with system APIs. [RFC][osstr-rfc].
9802 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9803 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9804 creating raw pointers.
9808 * Certain long error messages of the form 'expected foo found bar'
9809 are now [split neatly across multiple
9810 lines][multiline]. Examples in the PR.
9811 * On Unix Rust can be [uninstalled][un] by running
9812 `/usr/local/lib/rustlib/uninstall.sh`.
9813 * The `#[rustc_on_unimplemented]` attribute, requiring the
9814 'on_unimplemented' feature, lets rustc [display custom error
9815 messages when a trait is expected to be implemented for a type
9820 * Rust is tested against a [LALR grammar][lalr], which parses
9821 almost all the Rust files that rustc does.
9823 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9824 [close]: https://github.com/rust-lang/rust/pull/21843
9825 [deref]: https://github.com/rust-lang/rust/pull/21351
9826 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9827 [drop]: https://github.com/rust-lang/rust/pull/21972
9828 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9829 [feat]: https://github.com/rust-lang/rust/pull/21248
9830 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9831 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9832 [fmt]: https://github.com/rust-lang/rust/pull/21457
9833 [into]: https://github.com/rust-lang/rust/pull/20790
9834 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9835 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9836 [lalr]: https://github.com/rust-lang/rust/pull/21452
9837 [multiline]: https://github.com/rust-lang/rust/pull/19870
9838 [obj]: https://github.com/rust-lang/rust/pull/22230
9839 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9840 [onun]: https://github.com/rust-lang/rust/pull/20889
9841 [osstr]: https://github.com/rust-lang/rust/pull/21488
9842 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9843 [Self]: https://github.com/rust-lang/rust/pull/22158
9844 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9845 [un]: https://github.com/rust-lang/rust/pull/22256
9848 Version 1.0.0-alpha (2015-01-09)
9849 ==================================
9851 * ~2400 changes, numerous bugfixes
9855 * The language itself is considered feature complete for 1.0,
9856 though there will be many usability improvements and bugfixes
9857 before the final release.
9858 * Nearly 50% of the public API surface of the standard library has
9859 been declared 'stable'. Those interfaces are unlikely to change
9861 * The long-running debate over integer types has been
9862 [settled][ints]: Rust will ship with types named `isize` and
9863 `usize`, rather than `int` and `uint`, for pointer-sized
9864 integers. Guidelines will be rolled out during the alpha cycle.
9865 * Most crates that are not `std` have been moved out of the Rust
9866 distribution into the Cargo ecosystem so they can evolve
9867 separately and don't need to be stabilized as quickly, including
9868 'time', 'getopts', 'num', 'regex', and 'term'.
9869 * Documentation continues to be expanded with more API coverage, more
9870 examples, and more in-depth explanations. The guides have been
9871 consolidated into [The Rust Programming Language][trpl].
9872 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9873 * All official Rust binary installers now come with [Cargo], the
9874 Rust package manager.
9878 * Closures have been [completely redesigned][unboxed] to be
9879 implemented in terms of traits, can now be used as generic type
9880 bounds and thus monomorphized and inlined, or via an opaque
9881 pointer (boxed) as in the old system. The new system is often
9882 referred to as 'unboxed' closures.
9883 * Traits now support [associated types][assoc], allowing families
9884 of related types to be defined together and used generically in
9886 * Enum variants are [namespaced by their type names][enum].
9887 * [`where` clauses][where] provide a more versatile and attractive
9888 syntax for specifying generic bounds, though the previous syntax
9890 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9892 * Rust [no longer has a runtime][rt] of any description, and only
9893 supports OS threads, not green threads.
9894 * At long last, Rust has been overhauled for 'dynamically-sized
9895 types' ([DST]), which integrates 'fat pointers' (object types,
9896 arrays, and `str`) more deeply into the type system, making it
9898 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9899 `..j` that produce range types and which, when combined with the
9900 `Index` operator and multidispatch, leads to a convenient slice
9902 * The new range syntax revealed an ambiguity in the fixed-length
9903 array syntax, so now fixed length arrays [are written `[T;
9905 * The `Copy` trait is no longer implemented automatically. Unsafe
9906 pointers no longer implement `Sync` and `Send` so types
9907 containing them don't automatically either. `Sync` and `Send`
9908 are now 'unsafe traits' so one can "forcibly" implement them via
9909 `unsafe impl` if a type confirms to the requirements for them
9910 even though the internals do not (e.g. structs containing unsafe
9911 pointers like `Arc`). These changes are intended to prevent some
9912 footguns and are collectively known as [opt-in built-in
9913 traits][oibit] (though `Sync` and `Send` will soon become pure
9914 library types unknown to the compiler).
9915 * Operator traits now take their operands [by value][ops], and
9916 comparison traits can use multidispatch to compare one type
9917 against multiple other types, allowing e.g. `String` to be
9918 compared with `&str`.
9919 * `if let` and `while let` are no longer feature-gated.
9920 * Rust has adopted a more [uniform syntax for escaping unicode
9921 characters][unicode].
9922 * `macro_rules!` [has been declared stable][mac]. Though it is a
9923 flawed system it is sufficiently popular that it must be usable
9924 for 1.0. Effort has gone into [future-proofing][mac-future] it
9925 in ways that will allow other macro systems to be developed in
9926 parallel, and won't otherwise impact the evolution of the
9928 * The prelude has been [pared back significantly][prelude] such
9929 that it is the minimum necessary to support the most pervasive
9930 code patterns, and through [generalized where clauses][where]
9931 many of the prelude extension traits have been consolidated.
9932 * Rust's rudimentary reflection [has been removed][refl], as it
9933 incurred too much code generation for little benefit.
9934 * [Struct variants][structvars] are no longer feature-gated.
9935 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9936 known as 'higher-ranked trait bounds', this crucially allows
9937 unboxed closures to work.
9938 * Macros invocations surrounded by parens or square brackets and
9939 not terminated by a semicolon are [parsed as
9940 expressions][macros], which makes expressions like `vec![1i32,
9941 2, 3].len()` work as expected.
9942 * Trait objects now implement their traits automatically, and
9943 traits that can be coerced to objects now must be [object
9945 * Automatically deriving traits is now done with `#[derive(...)]`
9946 not `#[deriving(...)]` for [consistency with other naming
9947 conventions][derive].
9948 * Importing the containing module or enum at the same time as
9949 items or variants they contain is [now done with `self` instead
9950 of `mod`][self], as in use `foo::{self, bar}`
9951 * Glob imports are no longer feature-gated.
9952 * The `box` operator and `box` patterns have been feature-gated
9953 pending a redesign. For now unique boxes should be allocated
9954 like other containers, with `Box::new`.
9958 * A [series][coll1] of [efforts][coll2] to establish
9959 [conventions][coll3] for collections types has resulted in API
9960 improvements throughout the standard library.
9961 * New [APIs for error handling][err] provide ergonomic interop
9962 between error types, and [new conventions][err-conv] describe
9963 more clearly the recommended error handling strategies in Rust.
9964 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9965 it is easier to discuss failure in the context of error handling
9966 without making clarifications as to whether you are referring to
9967 the 'fail' macro or failure more generally.
9968 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9969 syscall when available.
9970 * The 'serialize' crate has been renamed 'rustc-serialize' and
9971 moved out of the distribution to Cargo. Although it is widely
9972 used now, it is expected to be superseded in the near future.
9973 * The `Show` formatter, typically implemented with
9974 `#[derive(Show)]` is [now requested with the `{:?}`
9975 specifier][show] and is intended for use by all types, for uses
9976 such as `println!` debugging. The new `String` formatter must be
9977 implemented by hand, uses the `{}` specifier, and is intended
9978 for full-fidelity conversions of things that can logically be
9979 represented as strings.
9983 * [Flexible target specification][flex] allows rustc's code
9984 generation to be configured to support otherwise-unsupported
9986 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9987 respective debuggers with Rust-appropriate pretty-printing.
9988 * The Windows installation of Rust is distributed with the
9989 MinGW components currently required to link binaries on that
9994 * Nullable enum optimizations have been extended to more types so
9995 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9996 space than the inner types themselves.
9997 * Work has begun on supporting AArch64.
9999 [Cargo]: https://crates.io
10000 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10001 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10002 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10003 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10004 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10005 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10006 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10007 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10008 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10009 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10010 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10011 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10012 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10013 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10014 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10015 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10016 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10017 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10018 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10019 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10020 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10021 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10022 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10023 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10024 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10025 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10026 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10027 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10028 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10029 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10030 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10031 [trpl]: https://doc.rust-lang.org/book/index.html
10032 [rbe]: http://rustbyexample.com/
10035 Version 0.12.0 (2014-10-09)
10036 =============================
10038 * ~1900 changes, numerous bugfixes
10042 * The introductory documentation (now called The Rust Guide) has
10043 been completely rewritten, as have a number of supplementary
10045 * Rust's package manager, Cargo, continues to improve and is
10046 sometimes considered to be quite awesome.
10047 * Many API's in `std` have been reviewed and updated for
10048 consistency with the in-development Rust coding
10049 guidelines. The standard library documentation tracks
10050 stabilization progress.
10051 * Minor libraries have been moved out-of-tree to the rust-lang org
10052 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10053 be installed with Cargo.
10054 * Lifetime elision allows lifetime annotations to be left off of
10055 function declarations in many common scenarios.
10056 * Rust now works on 64-bit Windows.
10059 * Indexing can be overloaded with the `Index` and `IndexMut`
10061 * The `if let` construct takes a branch only if the `let` pattern
10062 matches, currently behind the 'if_let' feature gate.
10063 * 'where clauses', a more flexible syntax for specifying trait
10064 bounds that is more aesthetic, have been added for traits and
10065 free functions. Where clauses will in the future make it
10066 possible to constrain associated types, which would be
10067 impossible with the existing syntax.
10068 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10069 the 'slicing_syntax' feature gate, and can be overloaded with
10070 the `Slice` or `SliceMut` traits.
10071 * The syntax for matching of sub-slices has been changed to use a
10072 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10073 consistency with other uses of `..` and to future-proof
10074 potential additional uses of the syntax.
10075 * The syntax for matching inclusive ranges in patterns has changed
10076 from `0..3` to `0...4` to be consistent with the exclusive range
10077 syntax for slicing.
10078 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10079 c]`) has been put behind the 'advanced_slice_patterns' feature
10080 gate and may be removed in the future.
10081 * Components of tuples and tuple structs can be extracted using
10082 the `value.0` syntax, currently behind the `tuple_indexing`
10084 * The `#[crate_id]` attribute is no longer supported; versioning
10085 is handled by the package manager.
10086 * Renaming crate imports are now written `extern crate foo as bar`
10087 instead of `extern crate bar = foo`.
10088 * Renaming use statements are now written `use foo as bar` instead
10089 of `use bar = foo`.
10090 * `let` and `match` bindings and argument names in macros are now
10092 * The new, more efficient, closure types ('unboxed closures') have
10093 been added under a feature gate, 'unboxed_closures'. These will
10094 soon replace the existing closure types, once higher-ranked
10095 trait lifetimes are added to the language.
10096 * `move` has been added as a keyword, for indicating closures
10097 that capture by value.
10098 * Mutation and assignment is no longer allowed in pattern guards.
10099 * Generic structs and enums can now have trait bounds.
10100 * The `Share` trait is now called `Sync` to free up the term
10101 'shared' to refer to 'shared reference' (the default reference
10103 * Dynamically-sized types have been mostly implemented,
10104 unifying the behavior of fat-pointer types with the rest of the
10106 * As part of dynamically-sized types, the `Sized` trait has been
10107 introduced, which qualifying types implement by default, and
10108 which type parameters expect by default. To specify that a type
10109 parameter does not need to be sized, write `<Sized? T>`. Most
10110 types are `Sized`, notable exceptions being unsized arrays
10111 (`[T]`) and trait types.
10112 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10113 * Lifetime bounds can now be applied to type parameters and object
10115 * The old, reference counted GC type, `Gc<T>` which was once
10116 denoted by the `@` sigil, has finally been removed. GC will be
10117 revisited in the future.
10120 * Library documentation has been improved for a number of modules.
10121 * Bit-vectors, collections::bitv has been modernized.
10122 * The url crate is deprecated in favor of
10123 http://github.com/servo/rust-url, which can be installed with
10125 * Most I/O stream types can be cloned and subsequently closed from
10126 a different thread.
10127 * A `std::time::Duration` type has been added for use in I/O
10128 methods that rely on timers, as well as in the 'time' crate's
10129 `Timespec` arithmetic.
10130 * The runtime I/O abstraction layer that enabled the green thread
10131 scheduler to do non-thread-blocking I/O has been removed, along
10132 with the libuv-based implementation employed by the green thread
10133 scheduler. This will greatly simplify the future I/O work.
10134 * `collections::btree` has been rewritten to have a more
10135 idiomatic and efficient design.
10138 * rustdoc output now indicates the stability levels of API's.
10139 * The `--crate-name` flag can specify the name of the crate
10140 being compiled, like `#[crate_name]`.
10141 * The `-C metadata` specifies additional metadata to hash into
10142 symbol names, and `-C extra-filename` specifies additional
10143 information to put into the output filename, for use by the
10144 package manager for versioning.
10145 * debug info generation has continued to improve and should be
10146 more reliable under both gdb and lldb.
10147 * rustc has experimental support for compiling in parallel
10148 using the `-C codegen-units` flag.
10149 * rustc no longer encodes rpath information into binaries by
10153 * Stack usage has been optimized with LLVM lifetime annotations.
10154 * Official Rust binaries on Linux are more compatible with older
10155 kernels and distributions, built on CentOS 5.10.
10158 Version 0.11.0 (2014-07-02)
10159 ==========================
10161 * ~1700 changes, numerous bugfixes
10164 * ~[T] has been removed from the language. This type is superseded by
10166 * ~str has been removed from the language. This type is superseded by
10168 * ~T has been removed from the language. This type is superseded by the
10170 * @T has been removed from the language. This type is superseded by the
10171 standard library's std::gc::Gc<T> type.
10172 * Struct fields are now all private by default.
10173 * Vector indices and shift amounts are both required to be a `uint`
10174 instead of any integral type.
10175 * Byte character, byte string, and raw byte string literals are now all
10176 supported by prefixing the normal literal with a `b`.
10177 * Multiple ABIs are no longer allowed in an ABI string
10178 * The syntax for lifetimes on closures/procedures has been tweaked
10179 slightly: `<'a>|A, B|: 'b + K -> T`
10180 * Floating point modulus has been removed from the language; however it
10181 is still provided by a library implementation.
10182 * Private enum variants are now disallowed.
10183 * The `priv` keyword has been removed from the language.
10184 * A closure can no longer be invoked through a &-pointer.
10185 * The `use foo, bar, baz;` syntax has been removed from the language.
10186 * The transmute intrinsic no longer works on type parameters.
10187 * Statics now allow blocks/items in their definition.
10188 * Trait bounds are separated from objects with + instead of : now.
10189 * Objects can no longer be read while they are mutably borrowed.
10190 * The address of a static is now marked as insignificant unless the
10191 #[inline(never)] attribute is placed it.
10192 * The #[unsafe_destructor] attribute is now behind a feature gate.
10193 * Struct literals are no longer allowed in ambiguous positions such as
10194 if, while, match, and for..in.
10195 * Declaration of lang items and intrinsics are now feature-gated by
10197 * Integral literals no longer default to `int`, and floating point
10198 literals no longer default to `f64`. Literals must be suffixed with an
10199 appropriate type if inference cannot determine the type of the
10201 * The Box<T> type is no longer implicitly borrowed to &mut T.
10202 * Procedures are now required to not capture borrowed references.
10205 * The standard library is now a "facade" over a number of underlying
10206 libraries. This means that development on the standard library should
10207 be speedier due to smaller crates, as well as a clearer line between
10209 * A new library, libcore, lives under the standard library's facade
10210 which is Rust's "0-assumption" library, suitable for embedded and
10211 kernel development for example.
10212 * A regex crate has been added to the standard distribution. This crate
10213 includes statically compiled regular expressions.
10214 * The unwrap/unwrap_err methods on Result require a Show bound for
10215 better error messages.
10216 * The return types of the std::comm primitives have been centralized
10217 around the Result type.
10218 * A number of I/O primitives have gained the ability to time out their
10220 * A number of I/O primitives have gained the ability to close their
10221 reading/writing halves to cancel pending operations.
10222 * Reverse iterator methods have been removed in favor of `rev()` on
10223 their forward-iteration counterparts.
10224 * A bitflags! macro has been added to enable easy interop with C and
10225 management of bit flags.
10226 * A debug_assert! macro is now provided which is disabled when
10227 `--cfg ndebug` is passed to the compiler.
10228 * A graphviz crate has been added for creating .dot files.
10229 * The std::cast module has been migrated into std::mem.
10230 * The std::local_data api has been migrated from freestanding functions
10231 to being based on methods.
10232 * The Pod trait has been renamed to Copy.
10233 * jemalloc has been added as the default allocator for types.
10234 * The API for allocating memory has been changed to use proper alignment
10235 and sized deallocation
10236 * Connecting a TcpStream or binding a TcpListener is now based on a
10237 string address and a u16 port. This allows connecting to a hostname as
10239 * The Reader trait now contains a core method, read_at_least(), which
10240 correctly handles many repeated 0-length reads.
10241 * The process-spawning API is now centered around a builder-style
10243 * The :? printing qualifier has been moved from the standard library to
10244 an external libdebug crate.
10245 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10246 have been renamed to Eq/Ord.
10247 * The select/plural methods have been removed from format!. The escapes
10248 for { and } have also changed from \{ and \} to {{ and }},
10250 * The TaskBuilder API has been re-worked to be a true builder, and
10251 extension traits for spawning native/green tasks have been added.
10254 * All breaking changes to the language or libraries now have their
10255 commit message annotated with `[breaking-change]` to allow for easy
10256 discovery of breaking changes.
10257 * The compiler will now try to suggest how to annotate lifetimes if a
10258 lifetime-related error occurs.
10259 * Debug info continues to be improved greatly with general bug fixes and
10260 better support for situations like link time optimization (LTO).
10261 * Usage of syntax extensions when cross-compiling has been fixed.
10262 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10263 -fdata-sections and --gc-sections has been enabled by default
10264 * The compiler is now stricter about where it will load module files
10265 from when a module is declared via `mod foo;`.
10266 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10267 Syntax extensions are now discovered via a "plugin registrar" type
10268 which will be extended in the future to other various plugins.
10269 * Lints have been restructured to allow for dynamically loadable lints.
10270 * A number of rustdoc improvements:
10271 * The HTML output has been visually redesigned.
10272 * Markdown is now powered by hoedown instead of sundown.
10273 * Searching heuristics have been greatly improved.
10274 * The search index has been reduced in size by a great amount.
10275 * Cross-crate documentation via `pub use` has been greatly improved.
10276 * Primitive types are now hyperlinked and documented.
10277 * Documentation has been moved from static.rust-lang.org/doc to
10279 * A new sandbox, play.rust-lang.org, is available for running and
10280 sharing rust code examples on-line.
10281 * Unused attributes are now more robustly warned about.
10282 * The dead_code lint now warns about unused struct fields.
10283 * Cross-compiling to iOS is now supported.
10284 * Cross-compiling to mipsel is now supported.
10285 * Stability attributes are now inherited by default and no longer apply
10286 to intra-crate usage, only inter-crate usage.
10287 * Error message related to non-exhaustive match expressions have been
10291 Version 0.10 (2014-04-03)
10292 =========================
10294 * ~1500 changes, numerous bugfixes
10297 * A new RFC process is now in place for modifying the language.
10298 * Patterns with `@`-pointers have been removed from the language.
10299 * Patterns with unique vectors (`~[T]`) have been removed from the
10301 * Patterns with unique strings (`~str`) have been removed from the
10303 * `@str` has been removed from the language.
10304 * `@[T]` has been removed from the language.
10305 * `@self` has been removed from the language.
10306 * `@Trait` has been removed from the language.
10307 * Headers on `~` allocations which contain `@` boxes inside the type for
10308 reference counting have been removed.
10309 * The semantics around the lifetimes of temporary expressions have changed,
10310 see #3511 and #11585 for more information.
10311 * Cross-crate syntax extensions are now possible, but feature gated. See
10312 #11151 for more information. This includes both `macro_rules!` macros as
10313 well as syntax extensions such as `format!`.
10314 * New lint modes have been added, and older ones have been turned on to be
10316 * Unnecessary parentheses
10317 * Uppercase statics
10319 * Uppercase variables
10320 * Publicly visible private types
10321 * `#[deriving]` with raw pointers
10322 * Unsafe functions can no longer be coerced to closures.
10323 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10324 * The `#[simd]` attribute is now behind a feature gate.
10325 * Visibility is no longer allowed on `extern crate` statements, and
10326 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10327 * Trailing commas are now allowed in argument lists and tuple patterns.
10328 * The `do` keyword has been removed, it is now a reserved keyword.
10329 * Default type parameters have been implemented, but are feature gated.
10330 * Borrowed variables through captures in closures are now considered soundly.
10331 * `extern mod` is now `extern crate`
10332 * The `Freeze` trait has been removed.
10333 * The `Share` trait has been added for types that can be shared among
10335 * Labels in macros are now hygienic.
10336 * Expression/statement macro invocations can be delimited with `{}` now.
10337 * Treatment of types allowed in `static mut` locations has been tweaked.
10338 * The `*` and `.` operators are now overloadable through the `Deref` and
10340 * `~Trait` and `proc` no longer have `Send` bounds by default.
10341 * Partial type hints are now supported with the `_` type marker.
10342 * An `Unsafe` type was introduced for interior mutability. It is now
10343 considered undefined to transmute from `&T` to `&mut T` without using the
10345 * The #[linkage] attribute was implemented for extern statics/functions.
10346 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10347 * `Pod` was renamed to `Copy`.
10350 * The `libextra` library has been removed. It has now been decomposed into
10351 component libraries with smaller and more focused nuggets of
10352 functionality. The full list of libraries can be found on the
10353 documentation index page.
10354 * std: `std::condition` has been removed. All I/O errors are now propagated
10355 through the `Result` type. In order to assist with error handling, a
10356 `try!` macro for unwrapping errors with an early return and a lint for
10357 unused results has been added. See #12039 for more information.
10358 * std: The `vec` module has been renamed to `slice`.
10359 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10360 This will become the only growable vector in the future.
10361 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10362 are now found at `std::io::BufferedReader` instead of
10363 `std::io::buffered::BufferedReader`.
10364 * std: `print` and `println` are no longer in the prelude, the `print!` and
10365 `println!` macros are intended to be used instead.
10366 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10367 attempts to statically prevent cycles.
10368 * std: The standard distribution is adopting the policy of pushing failure
10369 to the user rather than failing in libraries. Many functions (such as
10370 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10371 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10372 deriving mode: `#[deriving(Show)]`.
10373 * std: `ToStr` is now implemented for all types implementing `Show`.
10374 * std: The formatting trait methods now take `&self` instead of `&T`
10375 * std: The `invert()` method on iterators has been renamed to `rev()`
10376 * std: `std::num` has seen a reduction in the genericity of its traits,
10377 consolidating functionality into a few core traits.
10378 * std: Backtraces are now printed on task failure if the environment
10379 variable `RUST_BACKTRACE` is present.
10380 * std: Naming conventions for iterators have been standardized. More details
10381 can be found on the wiki's style guide.
10382 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10383 still implement the function.
10384 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10385 * std: `assert_approx_eq!` has been removed
10386 * std: The `e` and `E` formatting specifiers for floats have been added to
10387 print them in exponential notation.
10388 * std: The `Times` trait has been removed
10389 * std: Indications of variance and opting out of builtin bounds is done
10390 through marker types in `std::kinds::marker` now
10391 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10392 `#[deriving(Hash)]` is now possible.
10393 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10394 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10395 * std: `Chan::new` is now `channel()`.
10396 * std: A new synchronous channel type has been implemented.
10397 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10398 * std: `hashmap` and `trie` have been moved to `libcollections`
10399 * std: `run` has been rolled into `io::process`
10400 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10401 * std: The equality and comparison traits have seen some reorganization.
10402 * std: `rand` has moved to `librand`.
10403 * std: `to_{lower,upper}case` has been implemented for `char`.
10404 * std: Logging has been moved to `liblog`.
10405 * collections: `HashMap` has been rewritten for higher performance and less
10407 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10408 it can be booted manually. The runtime guide has more information and
10410 * native: All I/O functionality except signals has been implemented.
10411 * green: Task spawning with `libgreen` has been optimized with stack caching
10412 and various trimming of code.
10413 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10414 * sync: The `extra::sync` module has been updated to modern rust (and moved
10415 to the `sync` library), tweaking and improving various interfaces while
10416 dropping redundant functionality.
10417 * sync: A new `Barrier` type has been added to the `sync` library.
10418 * sync: An efficient mutex for native and green tasks has been implemented.
10419 * serialize: The `base64` module has seen some improvement. It treats
10420 newlines better, has non-string error values, and has seen general
10422 * fourcc: A `fourcc!` macro was introduced
10423 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10424 hexadecimal literal.
10427 * `rustpkg` has been deprecated and removed from the main repository. Its
10428 replacement, `cargo`, is under development.
10429 * Nightly builds of rust are now available
10430 * The memory usage of rustc has been improved many times throughout this
10432 * The build process supports disabling rpath support for the rustc binary
10434 * Code generation has improved in some cases, giving more information to the
10435 LLVM optimization passes to enable more extensive optimizations.
10436 * Debuginfo compatibility with lldb on OSX has been restored.
10437 * The master branch is now gated on an android bot, making building for
10438 android much more reliable.
10439 * Output flags have been centralized into one `--emit` flag.
10440 * Crate type flags have been centralized into one `--crate-type` flag.
10441 * Codegen flags have been consolidated behind a `-C` flag.
10442 * Linking against outdated crates now has improved error messages.
10443 * Error messages with lifetimes will often suggest how to annotate the
10444 function to fix the error.
10445 * Many more types are documented in the standard library, and new guides
10447 * Many `rustdoc` improvements:
10448 * code blocks are syntax highlighted.
10449 * render standalone markdown files.
10450 * the --test flag tests all code blocks by default.
10451 * exported macros are displayed.
10452 * re-exported types have their documentation inlined at the location of the
10454 * search works across crates that have been rendered to the same output
10458 Version 0.9 (2014-01-09)
10459 ==========================
10461 * ~1800 changes, numerous bugfixes
10464 * The `float` type has been removed. Use `f32` or `f64` instead.
10465 * A new facility for enabling experimental features (feature gating) has
10466 been added, using the crate-level `#[feature(foo)]` attribute.
10467 * Managed boxes (@) are now behind a feature gate
10468 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10469 standard library's `Gc` or `Rc` types instead.
10470 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10471 * Jumping back to the top of a loop is now done with `continue` instead of
10473 * Strings can no longer be mutated through index assignment.
10474 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10475 hash delimiters, as in `r###"foo"###`.
10476 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10478 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10479 * `@fn`s have been removed.
10480 * `do` only works with procs in order to make it obvious what the cost
10482 * Single-element tuple-like structs can no longer be dereferenced to
10483 obtain the inner value. A more comprehensive solution for overloading
10484 the dereference operator will be provided in the future.
10485 * The `#[link(...)]` attribute has been replaced with
10486 `#[crate_id = "name#vers"]`.
10487 * Empty `impl`s must be terminated with empty braces and may not be
10488 terminated with a semicolon.
10489 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10490 no longer has any special meaning.
10491 * The old `fmt!` string formatting macro has been removed.
10492 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10493 `print!` and `println!`.
10494 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10495 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10496 `extern mod foo = "bar"` instead.
10497 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10498 * Macros can have attributes.
10499 * Macros can expand to items with attributes.
10500 * Macros can expand to multiple items.
10501 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10502 * Comments may be nested.
10503 * Values automatically coerce to trait objects they implement, without
10505 * Enum discriminants are no longer an entire word but as small as needed to
10506 contain all the variants. The `repr` attribute can be used to override
10507 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10508 `#[repr(C)]` to match C enums.
10509 * Non-string literals are not allowed in attributes (they never worked).
10510 * The FFI now supports variadic functions.
10511 * Octal numeric literals, as in `0o7777`.
10512 * The `concat!` syntax extension performs compile-time string concatenation.
10513 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10514 removed as Rust no longer uses segmented stacks.
10515 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10516 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10517 not `*`; ignoring remaining fields of a struct is also done with `..`,
10518 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10519 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10520 * `rustc` supports the "system" calling convention, which defaults to the
10521 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10523 * The `type_overflow` lint (default: warn) checks literals for overflow.
10524 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10525 * The `attribute_usage` lint (default: warn) warns about unknown
10527 * The `unknown_features` lint (default: warn) warns about unknown
10529 * The `dead_code` lint (default: warn) checks for dead code.
10530 * Rust libraries can be linked statically to one another
10531 * `#[link_args]` is behind the `link_args` feature gate.
10532 * Native libraries are now linked with `#[link(name = "foo")]`
10533 * Native libraries can be statically linked to a rust crate
10534 (`#[link(name = "foo", kind = "static")]`).
10535 * Native OS X frameworks are now officially supported
10536 (`#[link(name = "foo", kind = "framework")]`).
10537 * The `#[thread_local]` attribute creates thread-local (not task-local)
10538 variables. Currently behind the `thread_local` feature gate.
10539 * The `return` keyword may be used in closures.
10540 * Types that can be copied via a memcpy implement the `Pod` kind.
10541 * The `cfg` attribute can now be used on struct fields and enum variants.
10544 * std: The `option` and `result` API's have been overhauled to make them
10545 simpler, more consistent, and more composable.
10546 * std: The entire `std::io` module has been replaced with one that is
10547 more comprehensive and that properly interfaces with the underlying
10548 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10550 * std: `io::util` contains a number of useful implementations of
10551 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10552 `ZeroReader`, `TeeReader`.
10553 * std: The reference counted pointer type `extra::rc` moved into std.
10554 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10555 just a wrapper around it).
10556 * std: The `Either` type has been removed.
10557 * std: `fmt::Default` can be implemented for any type to provide default
10558 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10559 * std: The `rand` API continues to be tweaked.
10560 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10561 on failure in gdb, is now named `rust_fail`.
10562 * std: The `each_key` and `each_value` methods on `HashMap` have been
10563 replaced by the `keys` and `values` iterators.
10564 * std: Functions dealing with type size and alignment have moved from the
10565 `sys` module to the `mem` module.
10566 * std: The `path` module was written and API changed.
10567 * std: `str::from_utf8` has been changed to cast instead of allocate.
10568 * std: `starts_with` and `ends_with` methods added to vectors via the
10569 `ImmutableEqVector` trait, which is in the prelude.
10570 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10571 if the index is out of bounds.
10572 * std: Task failure no longer propagates between tasks, as the model was
10573 complex, expensive, and incompatible with thread-based tasks.
10574 * std: The `Any` type can be used for dynamic typing.
10575 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10577 * std: Methods that produce iterators generally do not have an `_iter`
10579 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10580 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10581 * std: `util::ignore` renamed to `prelude::drop`.
10582 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10584 * std: `vec::raw` has seen a lot of cleanup and API changes.
10585 * std: The standard library no longer includes any C++ code, and very
10586 minimal C, eliminating the dependency on libstdc++.
10587 * std: Runtime scheduling and I/O functionality has been factored out into
10588 extensible interfaces and is now implemented by two different crates:
10589 libnative, for native threading and I/O; and libgreen, for green threading
10590 and I/O. This paves the way for using the standard library in more limited
10591 embedded environments.
10592 * std: The `comm` module has been rewritten to be much faster, have a
10593 simpler, more consistent API, and to work for both native and green
10595 * std: All libuv dependencies have been moved into the rustuv crate.
10596 * native: New implementations of runtime scheduling on top of OS threads.
10597 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10599 * green: The green thread scheduler and message passing types are almost
10600 entirely lock-free.
10601 * extra: The `flatpipes` module had bitrotted and was removed.
10602 * extra: All crypto functions have been removed and Rust now has a policy of
10603 not reimplementing crypto in the standard library. In the future crypto
10604 will be provided by external crates with bindings to established libraries.
10605 * extra: `c_vec` has been modernized.
10606 * extra: The `sort` module has been removed. Use the `sort` method on
10610 * The `rust` and `rusti` commands have been removed, due to lack of
10612 * `rustdoc` was completely rewritten.
10613 * `rustdoc` can test code examples in documentation.
10614 * `rustpkg` can test packages with the argument, 'test'.
10615 * `rustpkg` supports arbitrary dependencies, including C libraries.
10616 * `rustc`'s support for generating debug info is improved again.
10617 * `rustc` has better error reporting for unbalanced delimiters.
10618 * `rustc`'s JIT support was removed due to bitrot.
10619 * Executables and static libraries can be built with LTO (-Z lto)
10620 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10624 Version 0.8 (2013-09-26)
10625 ============================
10627 * ~2200 changes, numerous bugfixes
10630 * The `for` loop syntax has changed to work with the `Iterator` trait.
10631 * At long last, unwinding works on Windows.
10632 * Default methods are ready for use.
10633 * Many trait inheritance bugs fixed.
10634 * Owned and borrowed trait objects work more reliably.
10635 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10636 * rustc can omit emission of code for the `debug!` macro if it is passed
10638 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10639 for foo.rs, then foo/mod.rs, and will generate an error when both are
10641 * Strings no longer contain trailing nulls. The new `std::c_str` module
10642 provides new mechanisms for converting to C strings.
10643 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10644 * The FFI has been overhauled such that foreign functions are called directly,
10645 instead of through a stack-switching wrapper.
10646 * Calling a foreign function must be done through a Rust function with the
10647 `#[fixed_stack_segment]` attribute.
10648 * The `externfn!` macro can be used to declare both a foreign function and
10649 a `#[fixed_stack_segment]` wrapper at once.
10650 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10651 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10652 * `priv` is disallowed everywhere except for struct fields and enum variants.
10653 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10654 * `ref` bindings in irrefutable patterns work correctly now.
10655 * `char` is now prevented from containing invalid code points.
10656 * Casting to `bool` is no longer allowed.
10657 * `\0` is now accepted as an escape in chars and strings.
10658 * `yield` is a reserved keyword.
10659 * `typeof` is a reserved keyword.
10660 * Crates may be imported by URL with `extern mod foo = "url";`.
10661 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10662 * Static vectors can be initialized with repeating elements,
10663 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10664 * Static structs can be initialized with functional record update,
10665 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10666 * `cfg!` can be used to conditionally execute code based on the crate
10667 configuration, similarly to `#[cfg(...)]`.
10668 * The `unnecessary_qualification` lint detects unneeded module
10669 prefixes (default: allow).
10670 * Arithmetic operations have been implemented on the SIMD types in
10671 `std::unstable::simd`.
10672 * Exchange allocation headers were removed, reducing memory usage.
10673 * `format!` implements a completely new, extensible, and higher-performance
10674 string formatting system. It will replace `fmt!`.
10675 * `print!` and `println!` write formatted strings (using the `format!`
10676 extension) to stdout.
10677 * `write!` and `writeln!` write formatted strings (using the `format!`
10678 extension) to the new Writers in `std::rt::io`.
10679 * The library section in which a function or static is placed may
10680 be specified with `#[link_section = "..."]`.
10681 * The `proto!` syntax extension for defining bounded message protocols
10683 * `macro_rules!` is hygienic for `let` declarations.
10684 * The `#[export_name]` attribute specifies the name of a symbol.
10685 * `unreachable!` can be used to indicate unreachable code, and fails
10689 * std: Transitioned to the new runtime, written in Rust.
10690 * std: Added an experimental I/O library, `rt::io`, based on the new
10692 * std: A new generic `range` function was added to the prelude, replacing
10693 `uint::range` and friends.
10694 * std: `range_rev` no longer exists. Since range is an iterator it can be
10695 reversed with `range(lo, hi).invert()`.
10696 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10697 renamed to `unwrap_or`.
10698 * std: The `iterator` module was renamed to `iter`.
10699 * std: Integral types now support the `checked_add`, `checked_sub`, and
10700 `checked_mul` operations for detecting overflow.
10701 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10703 * std: Methods are standardizing on conventions for casting methods:
10704 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10706 * std: The `CString` type in `c_str` provides new ways to convert to and
10708 * std: `DoubleEndedIterator` can yield elements in two directions.
10709 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10711 * std: `str::from_bytes` renamed to `str::from_utf8`.
10712 * std: `pop_opt` and `shift_opt` methods added to vectors.
10713 * std: The task-local data interface no longer uses @, and keys are
10714 no longer function pointers.
10715 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10716 * std: Added `SharedPort` to `comm`.
10717 * std: `Eq` has a default method for `ne`; only `eq` is required
10718 in implementations.
10719 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10720 is required in implementations.
10721 * std: `is_utf8` performance is improved, impacting many string functions.
10722 * std: `os::MemoryMap` provides cross-platform mmap.
10723 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10724 are not 'in-bounds' are considered undefined.
10725 * std: Many freestanding functions in `vec` removed in favor of methods.
10726 * std: Many freestanding functions on scalar types removed in favor of
10728 * std: Many options to task builders were removed since they don't make
10729 sense in the new scheduler design.
10730 * std: More containers implement `FromIterator` so can be created by the
10732 * std: More complete atomic types in `unstable::atomics`.
10733 * std: `comm::PortSet` removed.
10734 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10735 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10736 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10737 default implementations.
10738 * std: Various `from_str` functions were removed in favor of a generic
10739 `from_str` which is available in the prelude.
10740 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10741 * extra: `dlist`, the doubly-linked list was modernized.
10742 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10743 * extra: Added `glob` module, replacing `std::os::glob`.
10744 * extra: `rope` was removed.
10745 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10746 * extra: `net`, and `timer` were removed. The experimental replacements
10747 are `std::rt::io::net` and `std::rt::io::timer`.
10748 * extra: Iterators implemented for `SmallIntMap`.
10749 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10750 * extra: `SmallIntSet` removed. Use `BitvSet`.
10751 * extra: Performance of JSON parsing greatly improved.
10752 * extra: `semver` updated to SemVer 2.0.0.
10753 * extra: `term` handles more terminals correctly.
10754 * extra: `dbg` module removed.
10755 * extra: `par` module removed.
10756 * extra: `future` was cleaned up, with some method renames.
10757 * extra: Most free functions in `getopts` were converted to methods.
10760 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10761 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10762 similarly to gcc's `--march` flag.
10763 * rustc's performance compiling small crates is much better.
10764 * rustpkg has received many improvements.
10765 * rustpkg supports git tags as package IDs.
10766 * rustpkg builds into target-specific directories so it can be used for
10768 * The number of concurrent test tasks is controlled by the environment
10769 variable RUST_TEST_TASKS.
10770 * The test harness can now report metrics for benchmarks.
10771 * All tools have man pages.
10772 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10773 * The runtime uses jemalloc for allocations.
10774 * Segmented stacks are temporarily disabled as part of the transition to
10775 the new runtime. Stack overflows are possible!
10776 * A new documentation backend, rustdoc_ng, is available for use. It is
10777 still invoked through the normal `rustdoc` command.
10780 Version 0.7 (2013-07-03)
10781 =======================
10783 * ~2000 changes, numerous bugfixes
10786 * `impl`s no longer accept a visibility qualifier. Put them on methods
10788 * The borrow checker has been rewritten with flow-sensitivity, fixing
10789 many bugs and inconveniences.
10790 * The `self` parameter no longer implicitly means `&'self self`,
10791 and can be explicitly marked with a lifetime.
10792 * Overloadable compound operators (`+=`, etc.) have been temporarily
10793 removed due to bugs.
10794 * The `for` loop protocol now requires `for`-iterators to return `bool`
10795 so they compose better.
10796 * The `Durable` trait is replaced with the `'static` bounds.
10797 * Trait default methods work more often.
10798 * Structs with the `#[packed]` attribute have byte alignment and
10799 no padding between fields.
10800 * Type parameters bound by `Copy` must now be copied explicitly with
10801 the `copy` keyword.
10802 * It is now illegal to move out of a dereferenced unsafe pointer.
10803 * `Option<~T>` is now represented as a nullable pointer.
10804 * `@mut` does dynamic borrow checks correctly.
10805 * The `main` function is only detected at the topmost level of the crate.
10806 The `#[main]` attribute is still valid anywhere.
10807 * Struct fields may no longer be mutable. Use inherited mutability.
10808 * The `#[no_send]` attribute makes a type that would otherwise be
10810 * The `#[no_freeze]` attribute makes a type that would otherwise be
10812 * Unbounded recursion will abort the process after reaching the limit
10813 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10814 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10815 are never implicitly copyable.
10816 * `#[static_assert]` makes compile-time assertions about static bools.
10817 * At long last, 'argument modes' no longer exist.
10818 * The rarely used `use mod` statement no longer exists.
10820 * Syntax extensions
10821 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10823 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10824 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10825 `#[deriving(...)]`.
10826 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10827 and unsuffixed integer literals.
10830 * The `core` crate was renamed to `std`.
10831 * The `std` crate was renamed to `extra`.
10832 * More and improved documentation.
10833 * std: `iterator` module for external iterator objects.
10834 * Many old-style (internal, higher-order function) iterators replaced by
10835 implementations of `Iterator`.
10836 * std: Many old internal vector and string iterators,
10837 incl. `any`, `all`. removed.
10838 * std: The `finalize` method of `Drop` renamed to `drop`.
10839 * std: The `drop` method now takes `&mut self` instead of `&self`.
10840 * std: The prelude no longer re-exports any modules, only types and traits.
10841 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10842 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10843 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10844 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10845 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10846 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10847 * std: Many types implement `Clone`.
10848 * std: `path` type renamed to `Path`.
10849 * std: `mut` module and `Mut` type removed.
10850 * std: Many standalone functions removed in favor of methods and iterators
10851 in `vec`, `str`. In the future methods will also work as functions.
10852 * std: `reinterpret_cast` removed. Use `transmute`.
10853 * std: ascii string handling in `std::ascii`.
10854 * std: `Rand` is implemented for ~/@.
10855 * std: `run` module for spawning processes overhauled.
10856 * std: Various atomic types added to `unstable::atomic`.
10857 * std: Various types implement `Zero`.
10858 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10859 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10860 * std: Added `os::mkdir_recursive`.
10861 * std: Added `os::glob` function performs filesystems globs.
10862 * std: `FuzzyEq` renamed to `ApproxEq`.
10863 * std: `Map` now defines `pop` and `swap` methods.
10864 * std: `Cell` constructors converted to static methods.
10865 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10866 * extra: `flate` module moved from `std` to `extra`.
10867 * extra: `fileinput` module for iterating over a series of files.
10868 * extra: `Complex` number type and `complex` module.
10869 * extra: `Rational` number type and `rational` module.
10870 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10871 * extra: `term` uses terminfo now, is more correct.
10872 * extra: `arc` functions converted to methods.
10873 * extra: Implementation of fixed output size variations of SHA-2.
10876 * `unused_variables` lint mode for unused variables (default: warn).
10877 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10879 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10881 * `dead_assignment` lint mode for unread variables (default: warn).
10882 * `unnecessary_allocation` lint mode detects some heap allocations that are
10883 immediately borrowed so could be written without allocating (default: warn).
10884 * `missing_doc` lint mode (default: allow).
10885 * `unreachable_code` lint mode (default: warn).
10886 * The `rusti` command has been rewritten and a number of bugs addressed.
10887 * rustc outputs in color on more terminals.
10888 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10889 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10890 * Compiling with `-g` will make the binary record information about
10891 dynamic borrowcheck failures for debugging.
10892 * rustdoc has a nicer stylesheet.
10893 * Various improvements to rustdoc.
10894 * Improvements to rustpkg (see the detailed release notes).
10897 Version 0.6 (2013-04-03)
10898 ========================
10900 * ~2100 changes, numerous bugfixes
10903 * The self type parameter in traits is now spelled `Self`
10904 * The `self` parameter in trait and impl methods must now be explicitly
10905 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10906 * Static methods no longer require the `static` keyword and instead
10907 are distinguished by the lack of a `self` parameter
10908 * Replaced the `Durable` trait with the `'static` lifetime
10909 * The old closure type syntax with the trailing sigil has been
10910 removed in favor of the more consistent leading sigil
10911 * `super` is a keyword, and may be prefixed to paths
10912 * Trait bounds are separated with `+` instead of whitespace
10913 * Traits are implemented with `impl Trait for Type`
10914 instead of `impl Type: Trait`
10915 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10916 * The `export` keyword has finally been removed
10917 * The `move` keyword has been removed (see "Semantic changes")
10918 * The interior mutability qualifier on vectors, `[mut T]`, has been
10919 removed. Use `&mut [T]`, etc.
10920 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10921 * `fail` is no longer a keyword. Use `fail!()`
10922 * `assert` is no longer a keyword. Use `assert!()`
10923 * `log` is no longer a keyword. use `debug!`, etc.
10924 * 1-tuples may be represented as `(T,)`
10925 * Struct fields may no longer be `mut`. Use inherited mutability,
10926 `@mut T`, `core::mut` or `core::cell`
10927 * `extern mod { ... }` is no longer valid syntax for foreign
10928 function modules. Use extern blocks: `extern { ... }`
10929 * Newtype enums removed. Use tuple-structs.
10930 * Trait implementations no longer support visibility modifiers
10931 * Pattern matching over vectors improved and expanded
10932 * `const` renamed to `static` to correspond to lifetime name,
10933 and make room for future `static mut` unsafe mutable globals.
10934 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10935 * `Clone` implementations can be automatically generated with
10936 `#[deriving(Clone)]`
10937 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10938 instead of `foo as Bar`.
10939 * Fixed length vector types are now written as `[int, .. 3]`
10940 instead of `[int * 3]`.
10941 * Fixed length vector types can express the length as a constant
10942 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10945 * Types with owned pointers or custom destructors move by default,
10946 eliminating the `move` keyword
10947 * All foreign functions are considered unsafe
10948 * &mut is now unaliasable
10949 * Writes to borrowed @mut pointers are prevented dynamically
10951 * The name of the main function can be customized using #[main]
10952 * The default type of an inferred closure is &fn instead of @fn
10953 * `use` statements may no longer be "chained" - they cannot import
10954 identifiers imported by previous `use` statements
10955 * `use` statements are crate relative, importing from the "top"
10956 of the crate by default. Paths may be prefixed with `super::`
10957 or `self::` to change the search behavior.
10958 * Method visibility is inherited from the implementation declaration
10959 * Structural records have been removed
10960 * Many more types can be used in static items, including enums
10961 'static-lifetime pointers and vectors
10962 * Pattern matching over vectors improved and expanded
10963 * Typechecking of closure types has been overhauled to
10964 improve inference and eliminate unsoundness
10965 * Macros leave scope at the end of modules, unless that module is
10966 tagged with #[macro_escape]
10969 * Added big integers to `std::bigint`
10970 * Removed `core::oldcomm` module
10971 * Added pipe-based `core::comm` module
10972 * Numeric traits have been reorganized under `core::num`
10973 * `vec::slice` finally returns a slice
10974 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10975 * Containers reorganized around traits in `core::container`
10976 * `core::dvec` removed, `~[T]` is a drop-in replacement
10977 * `core::send_map` renamed to `core::hashmap`
10978 * `std::map` removed; replaced with `core::hashmap`
10979 * `std::treemap` reimplemented as an owned balanced tree
10980 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10981 * `core::trie` added as a fast ordered map for integer keys
10982 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10983 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10984 overload the comparison operators, whereas `TotalOrd` is used
10985 by certain container types
10988 * Replaced the 'cargo' package manager with 'rustpkg'
10989 * Added all-purpose 'rust' tool
10990 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10991 * rustc now *attempts* to offer spelling suggestions
10992 * Improved support for ARM and Android
10993 * Preliminary MIPS backend
10994 * Improved foreign function ABI implementation for x86, x86_64
10995 * Various memory usage improvements
10996 * Rust code may be embedded in foreign code under limited circumstances
10997 * Inline assembler supported by new asm!() syntax extension.
11000 Version 0.5 (2012-12-21)
11001 ===========================
11003 * ~900 changes, numerous bugfixes
11006 * Removed `<-` move operator
11007 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11008 * Removed old fixed length vector syntax - `[T]/N`
11009 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11010 * Macros may now expand to items and statements
11011 * `a.b()` is always parsed as a method call, never as a field projection
11012 * `Eq` and `IterBytes` implementations can be automatically generated
11013 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11014 * Removed the special crate language for `.rc` files
11015 * Function arguments may consist of any irrefutable pattern
11018 * `&` and `~` pointers may point to objects
11019 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11020 * Enum variants may be structs
11021 * Destructors can be added to all nominal types with the Drop trait
11022 * Structs and nullary enum variants may be constants
11023 * Values that cannot be implicitly copied are now automatically moved
11024 without writing `move` explicitly
11025 * `&T` may now be coerced to `*T`
11026 * Coercions happen in `let` statements as well as function calls
11027 * `use` statements now take crate-relative paths
11028 * The module and type namespaces have been merged so that static
11029 method names can be resolved under the trait in which they are
11032 * Improved support for language features
11033 * Trait inheritance works in many scenarios
11034 * More support for explicit self arguments in methods - `self`, `&self`
11035 `@self`, and `~self` all generally work as expected
11036 * Static methods work in more situations
11037 * Experimental: Traits may declare default methods for the implementations
11041 * New condition handling system in `core::condition`
11042 * Timsort added to `std::sort`
11043 * New priority queue, `std::priority_queue`
11044 * Pipes for serializable types, `std::flatpipes'
11045 * Serialization overhauled to be trait-based
11046 * Expanded `getopts` definitions
11047 * Moved futures to `std`
11048 * More functions are pure now
11049 * `core::comm` renamed to `oldcomm`. Still deprecated
11050 * `rustdoc` and `cargo` are libraries now
11053 * Added a preliminary REPL, `rusti`
11054 * License changed from MIT to dual MIT/APL2
11057 Version 0.4 (2012-10-15)
11058 ==========================
11060 * ~2000 changes, numerous bugfixes
11063 * All keywords are now strict and may not be used as identifiers anywhere
11064 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11065 'of', 'with', 'to', 'class'.
11066 * Classes are replaced with simpler structs
11067 * Explicit method self types
11068 * `ret` became `return` and `alt` became `match`
11069 * `import` is now `use`; `use is now `extern mod`
11070 * `extern mod { ... }` is now `extern { ... }`
11071 * `use mod` is the recommended way to import modules
11072 * `pub` and `priv` replace deprecated export lists
11073 * The syntax of `match` pattern arms now uses fat arrow (=>)
11074 * `main` no longer accepts an args vector; use `os::args` instead
11077 * Trait implementations are now coherent, ala Haskell typeclasses
11078 * Trait methods may be static
11079 * Argument modes are deprecated
11080 * Borrowed pointers are much more mature and recommended for use
11081 * Strings and vectors in the static region are stored in constant memory
11082 * Typestate was removed
11083 * Resolution rewritten to be more reliable
11084 * Support for 'dual-mode' data structures (freezing and thawing)
11087 * Most binary operators can now be overloaded via the traits in
11089 * `std::net::url` for representing URLs
11090 * Sendable hash maps in `core::send_map`
11091 * `core::task' gained a (currently unsafe) task-local storage API
11094 * An efficient new intertask communication primitive called the pipe,
11095 along with a number of higher-level channel types, in `core::pipes`
11096 * `std::arc`, an atomically reference counted, immutable, shared memory
11098 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11099 * Futures are now based on pipes and sendable
11100 * More robust linked task failure
11101 * Improved task builder API
11104 * Improved error reporting
11105 * Preliminary JIT support
11106 * Preliminary work on precise GC
11107 * Extensive architectural improvements to rustc
11108 * Begun a transition away from buggy C++-based reflection (shape) code to
11109 Rust-based (visitor) code
11110 * All hash functions and tables converted to secure, randomized SipHash
11113 Version 0.3 (2012-07-12)
11114 ========================
11116 * ~1900 changes, numerous bugfixes
11118 * New coding conveniences
11119 * Integer-literal suffix inference
11120 * Per-item control over warnings, errors
11121 * #[cfg(windows)] and #[cfg(unix)] attributes
11122 * Documentation comments
11123 * More compact closure syntax
11124 * 'do' expressions for treating higher-order functions as
11126 * *-patterns (wildcard extended to all constructor fields)
11129 * Name resolution pass and exhaustiveness checker rewritten
11130 * Region pointers and borrow checking supersede alias
11132 * Init-ness checking is now provided by a region-based liveness
11133 pass instead of the typestate pass; same for last-use analysis
11134 * Extensive work on region pointers
11136 * Experimental new language features
11137 * Slices and fixed-size, interior-allocated vectors
11138 * #!-comments for lang versioning, shell execution
11139 * Destructors and iface implementation for classes;
11140 type-parameterized classes and class methods
11141 * 'const' type kind for types that can be used to implement
11142 shared-memory concurrency patterns
11146 * Removal of various obsolete features
11147 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11148 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11150 * Constructs: do-while loops ('do' repurposed), fn binding,
11151 resources (replaced by destructors)
11153 * Compiler reorganization
11154 * Syntax-layer of compiler split into separate crate
11155 * Clang (from LLVM project) integrated into build
11156 * Typechecker split into sub-modules
11159 * New time functions
11160 * Extension methods for many built-in types
11161 * Arc: atomic-refcount read-only / exclusive-use shared cells
11162 * Par: parallel map and search routines
11163 * Extensive work on libuv interface
11164 * Much vector code moved to libraries
11165 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11166 #include, #include_str, #include_bin
11168 * Tool improvements
11169 * Cargo automatically resolves dependencies
11172 Version 0.2 (2012-03-29)
11173 =========================
11175 * >1500 changes, numerous bugfixes
11177 * New docs and doc tooling
11179 * New port: FreeBSD x86_64
11181 * Compilation model enhancements
11182 * Generics now specialized, multiply instantiated
11183 * Functions now inlined across separate crates
11185 * Scheduling, stack and threading fixes
11186 * Noticeably improved message-passing performance
11187 * Explicit schedulers
11191 * Experimental new language features
11192 * Operator overloading
11196 * Various language extensions
11197 * C-callback function types: 'crust fn ...'
11198 * Infinite-loop construct: 'loop { ... }'
11199 * Shorten 'mutable' to 'mut'
11200 * Required mutable-local qualifier: 'let mut ...'
11201 * Basic glob-exporting: 'export foo::*;'
11202 * Alt now exhaustive, 'alt check' for runtime-checked
11203 * Block-function form of 'for' loop, with 'break' and 'ret'.
11206 * AST quasi-quote syntax extension
11207 * Revived libuv interface
11208 * New modules: core::{future, iter}, std::arena
11209 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11210 * Extensive cleanup, regularization in libstd, libcore
11213 Version 0.1 (2012-01-20)
11214 ===============================
11216 * Most language features work, including:
11217 * Unique pointers, unique closures, move semantics
11218 * Interface-constrained generics
11219 * Static interface dispatch
11221 * Multithread task scheduling
11222 * Typestate predicates
11223 * Failure unwinding, destructors
11224 * Pattern matching and destructuring assignment
11225 * Lightweight block-lambda syntax
11226 * Preliminary macro-by-example
11228 * Compiler works with the following configurations:
11229 * Linux: x86 and x86_64 hosts and targets
11230 * macOS: x86 and x86_64 hosts and targets
11231 * Windows: x86 hosts and targets
11233 * Cross compilation / multi-target configuration supported.
11235 * Preliminary API-documentation and package-management tools included.
11239 * Documentation is incomplete.
11241 * Performance is below intended target.
11243 * Standard library APIs are subject to extensive change, reorganization.
11245 * Language-level versioning is not yet operational - future code will
11246 break unexpectedly.